SYNCHRONIZATION FOR IMPROVING BROADBAND COVERAGE

专利摘要:
methods, systems and devices for non-wired communication are described for synchronization to improve broadband coverage. a user equipment (eu) can receive a primary sync signal (pss) and a secondary sync signal (sss) in a subframe. in one example, the sss can be received in a symbol that is after a symbol in which the pss is received, and after a set of symbols in which a set of other synchronization signals is received. in another example, pss can be received on each of the first several consecutive symbols, and the sss can be received on each of the several second consecutive symbols, where the several second consecutive symbols are after the first several consecutive symbols within the subframe. the eu can synchronize with a base station based, at least in part, on pss and sss. several other aspects are provided.
公开号:BR112019023143A2
申请号:R112019023143-9
申请日:2018-04-13
公开日:2020-05-26
发明作者:Liu Chih-Hao；Yerramalli Srinivas；Kadous Tamer
申请人:Qualcomm Incorporated；
IPC主号:

专利说明:

SYNCHRONIZATION FOR IMPROVING BROADBAND COVERAGE
BACKGROUND
[0001] The following statement generally relates to non-wired communication and, more specifically, synchronization to improve broadband coverage.
[0002] Unwired communications systems are widely implemented to provide various types of communication content, such as voice, video, packet data, message exchange, broadcast, among others. These systems may be able to support communication with multiple users, by sharing available system resources (for example, time, frequency and energy). Examples of such multiple access systems include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Division Multiple Access (FDMA) systems and access systems orthogonal frequency division multiple (OFDMA) (for example, a Long Term Evolution system (LTE) or a Nova Rádio system (NR)). A non-wired multiple access communications system can include multiple base stations or access network nodes, each simultaneously supporting communication to multiple communication devices, which otherwise may be known as user equipment (UE).
[0003] Sometimes, a UE may need to perform an initial access procedure (or initial acquisition) to gain access to a non-wired network. As part of
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2/94 initial access procedure, the UE may need to search for a synchronization channel transmitted by a network access device, such as a base station, from the non-wired network. The UE can also acquire several items of system information, such as information contained in a master information block (MIB) or one or more system information blocks (for example, SIB1, SIB2, etc.) that can be transmitted on a physical broadcast channel (PBCH) from a base station.
SUMMARY
[0004] The techniques described relate to improved methods, systems, devices or devices that support synchronization to improve broadband coverage. Generally, the techniques described provide a reduction in the duration of cell acquisition by a user equipment (UE). Conventional cell acquisition techniques are not conducive to operating on systems using listening before speaking (LBT) procedures, are unable to consistently match more than two symbols due to frequency mismatch between the UE and the base station, do not match effectively symbols to reduce noise and combinations of them. The examples described in this document may provide a primary sync signal detection (PSS) technique that improves the probability of detection at once. In addition, the techniques described in this document can encode a group of cell identifiers, a subframe offset for a reference signal, or both, in a secondary sync signal sequence (SSS) that can be
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3/94 used to determine the subframe timing and a scrambling rule for the reference signal.
[0005] A non-wired communication method is described. The method may include receiving, by a UE, a PSS primary sync signal and an SSS in a frame subframe, where the SSS is received in a subframe symbol which is after a subframe symbol in which the PSS is received, and after a set of symbols in the subframe in which a set of other synchronization signals is received; and synchronize by the UE, with a base station based, at least in part, on the PSS and SSS received in the subframe.
[0006] An apparatus for non-wired communication is described. The apparatus may include means for receiving a PSS primary sync signal and an SSS in a frame subframe, where the SSS is received in a subframe symbol which is after a subframe symbol in which the PSS is received and after a set of symbols of the subframe in which a set of other synchronization signals is received; and means for synchronizing the apparatus with a base station based, at least in part, on the PSS and SSS received in the subframe.
[0007] Another device for non-wired communication is described. The device may include a processor, a memory in electronic communication with the processor and instructions stored in memory. The instructions can be operable to make the processor receive a PSS and SSS primary synchronization signal in the subframe of a frame, where the SSS is received in a symbol of the subframe that is after a symbol of the subframe
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4/94 in which the PSS is received, and after a set of symbols in the subframe where a set of other synchronization signals is received; and synchronizing the handset with a base station based, at least in part, on the PSS and SSS received in the subframe.
[0008] A non-temporary, computer-readable medium for non-wired communication is described. The computer-readable non-temporary medium may include instructions operable to make a processor receive a primary PSS and SSS synchronization signal in a frame subframe, where the SSS is received in a subframe symbol which is after a subframe symbol in which PSS is received and after a set of symbols of the subframe in which a set of other synchronization signals is received; and synchronizing a UE with a base station based, at least in part, on the PSS and SSS received in the subframe.
[0009] Some examples of the computer-readable method, apparatus and non-temporary medium described above may additionally include processes, characteristics, means or instructions for receiving the PSS and SSS in another subframe of the frame, where the SSS is received in a symbol of the another subframe that is before a symbol of the other subframe in which the PSS is received and before a set of symbols of the other subframe in which the set of other synchronization signals is received, where the other subframe is before the subframe, and where a UE is configured to synchronize with a base station based, at least in part, on the PSS or on the SSS received in the other subframe.
[0010] In some examples of the method, apparatus
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5/94 and computer readable non-temporary medium described above, within the subframe: the symbols in which the PSS and SSS are received are in a specific first location and the set of symbols in which the set of other synchronization signals is received is in a second specific location; and within the other subframe: the set of symbols in which the set of other synchronization signals is received is in the first specific location and the symbols in which the PSS and SSS are received are in the second specific location.
[0011] In some examples of the method, apparatus and non-temporary computer-readable medium described above, within the subframe: another PSS, included in the set of other synchronization signals, is received in a symbol, in the second specific location, which is before a symbol in which another SSS, included in the set of other synchronization signals, is received; and within the other subframe: the other PSS, included in the set of other synchronization signals, is received in a symbol, in the first specific location, which is after a symbol in which the other SSS, included in the set of other synchronization signals, is received.
[0012] Some examples of the computer-readable method, apparatus and non-temporary medium described above may additionally include processes, characteristics, means or instructions for receiving the PSS and the SSS in another subframe of the frame, where the SSS is received in a symbol of the another subframe that is after a symbol of the other subframe in which the PSS is received and after a set of symbols of the other subframe in which the set of other
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6/94 synchronization is received, where the other subframe is after the subframe, and where the UE is configured to synchronize with the base station based at least in part on the PSS or SSS received on the other subframe.
[0013] A non-wired communication method is described. The method may include receiving, by a UE, a PSS and an SSS in the subframe of a frame, where the PSS is received in each of the first several consecutive symbols of the subframe and where the SSS is received in each of the second several consecutive symbols the subframe, where the second several consecutive symbols are after the first several consecutive symbols within the subframe; and synchronize, by the UE, with a base station based, at least in part, on the PSS and SSS received in the subframe.
[0014] An apparatus for non-wired communication is described. The apparatus may include means for receiving a PSS and an SSS in the subframe of a frame, where the PSS is received in each of the several consecutive first symbols of the subframe and where the SSS is received in each of the several consecutive second symbols of the subframe, where the several consecutive second symbols are after the first several consecutive symbols within the subframe; and means for synchronizing the apparatus with a base station based, at least in part, on the PSS and SSS received in the subframe.
[0015] Another device for non-wired communication is described. The device may include a processor, a memory in electronic communication with the processor and instructions stored in memory. Instructions can be operable to make the
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7/94 processor receives a PSS and an SSS in the subframe of a frame, where the PSS is received in each of the several consecutive first symbols of the subframe and where the SSS is received in each of the several consecutive second symbols of the subframe, where the several consecutive second symbols are after the first several consecutive symbols within the subframe; and synchronizing the handset with a base station based, at least in part, on the PSS and SSS received in the subframe.
[0016] A non-temporary, computer-readable medium for non-wired communication is described. The computer-readable non-temporary medium may include operable instructions to have a processor receive a PSS and an SSS in a frame subframe, where the PSS is received in each of the first several consecutive symbols in the subframe and where the SSS is received in each of the several consecutive second symbols in the subframe, where the several second consecutive symbols are after the first several consecutive symbols within the subframe; and synchronizing a UE with a base station based, at least in part, on the PSS and SSS received in the subframe.
[0017] In some examples of the computer-readable method, apparatus and non-temporary medium described above, the first several consecutive symbols include fourteen or less consecutive symbols in the subframe.
[0018] In some examples of the computer-readable method, apparatus and non-temporary medium described above, the several second consecutive symbols include fourteen or less consecutive symbols in the subframe.
[0019] Some examples of the method, apparatus and
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8/94 computer readable non-temporary medium described above may additionally include processes, characteristics, means or instructions for determining a physical cell identity, associated with the base station, based at least in part on the SSS and a set of assumptions associated with the PSS, where the UE is configured to synchronize with the base station based, at least in part, on the physical cell identity.
[0020] Some examples of the computer-readable method, apparatus and non-temporary medium described above may additionally include processes, characteristics, means or instructions for combining the PSS, received in one of the first several consecutive symbols of the subframe, with another PSS received in another symbol, where the UE is configured to synchronize with the base station based, at least in part, on the combination of the PSS and the other PSS.
[0021] In some examples of the method, apparatus and non-temporary computer-readable medium described above, a sequence of coverage code, associated with the PSS, is a binary coverage code.
[0022] In some examples of the computer-readable method, apparatus and non-temporary medium described above, the SSS is associated with a group of cell identifiers, associated with the base station, and with a subframe offset associated with a reference signal.
[0023] A non-wired communication method is described. The method may include generating, by a base station, an SSS based at least in part on a group of cell identifiers associated with the base station; and transmit, through the base station, the SSS and a PSS in one
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9/94 subframe of a frame, where the SSS is transmitted in a symbol of the subframe which is after a symbol of the subframe in which the PSS is transmitted and after a set of symbols of the subframe in which a set of other synchronization signals is transmitted .
[0024] An apparatus for non-wired communication is described. The apparatus may include a means to generate an SSS based, at least in part, on a group of cell identifiers associated with a base station; and means for transmitting the SSS and a PSS in a subframe of a frame, where the SSS is transmitted in a symbol of the subframe which is after a symbol of the subframe in which the PSS is transmitted and after a set of symbols of the subframe in which a set of other synchronization signals is transmitted.
[0025] Another device for non-wired communication is described. The device can include a processor, memory in electronic communication with the processor and instructions stored in memory. The instructions can be operable to make the processor generate an SSS based, at least in part, on a group of cell identifiers associated with a base station; and transmit the SSS and a PSS in a subframe of a frame, where the SSS is transmitted in a symbol of the subframe which is after a symbol of the subframe in which the PSS is transmitted and after a set of symbols of the subframe in which a set of other synchronization signals are transmitted.
[0026] A non-temporary, computer-readable medium for non-wired communication is described. The middle
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Computer-readable non-temporary 10/94 may include operable instructions to have a processor generate an SSS based, at least in part, on a group of cell identifiers associated with a base station; and transmit the SSS and a PSS in a subframe of a frame, where the SSS is transmitted in a symbol of the subframe which is after a symbol of the subframe in which the PSS is transmitted and after a set of symbols of the subframe in which a set of other synchronization signals are transmitted.
[0027] Some examples of the computer-readable method, apparatus and non-temporary medium described above may additionally include processes, characteristics, means or instructions for transmitting the PSS and SSS in another subframe of the frame, where the SSS is transmitted in a symbol of the another subframe that is before a symbol of the other subframe in which the PSS is transmitted and before a set of symbols of the other subframe in which the set of other synchronization signals is transmitted, where the other subframe is before the subframe and where a User equipment is configured to synchronize with the base station based, at least in part, on the PSS or the SSS transmitted in the other subframe.
[0028] In some examples of the method, apparatus and non-temporary computer-readable medium described above, within the subframe: the symbols in which the PSS and SSS are transmitted are in a specific first location and the set of symbols in which the set other synchronization signals are transmitted is in a second specific location; and within the other subframe: the set
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11/94 of symbols in which the set of other synchronization signals is transmitted is in the first specific location and the symbols in which the PSS and SSS are transmitted are in the second specific location.
[0029] In some examples of the method, apparatus and non-temporary computer-readable medium described above, within the subframe: another PSS, included in the set of other synchronization signals, is transmitted in a symbol, in the second specific location, ie before a symbol in which another SSS, included in the set of other synchronization signals, is transmitted; and within the other subframe: the other PSS, included in the set of other synchronization signals, is transmitted in a symbol, in the first specific location, after a symbol in which the other SSS, included in the set of other synchronization signals, is transmitted .
[0030] Some examples of the computer-readable method, apparatus and non-temporary medium described above may additionally include processes, characteristics, medium or instructions for transmitting PSS and SSS in another subframe of the frame, where the SSS is transmitted in a symbol of the another subframe which is after a symbol of the other subframe in which the PSS is transmitted and after a set of symbols of the other subframe in which the set of other synchronization signals is transmitted, where the other subframe is after the subframe and where a user is configured to synchronize with the base station based, at least in part, on the PSS or the SSS transmitted in the other subframe.
[0031] A non-wired communication method is
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Described 12/94. The method may include generating, by a base station, an SSS based at least in part on a group of cell identifiers associated with the base station; and transmit, through the base station, the SSS and a PSS in a subframe of a frame, where the PSS is transmitted in each of the several consecutive first symbols of the subframe and where the SSS is transmitted in each of the several consecutive second symbols of the subframe , where the several second consecutive symbols are after the first several consecutive symbols within the subframe.
[0032] An apparatus for non-wired communication is described. The apparatus may include a means to generate an SSS based, at least in part, on a group of cell identifiers associated with the base station; and means for transmitting the SSS and a PSS in a subframe of a frame, where the PSS is transmitted in each of the several consecutive first symbols of the subframe and where the SSS is transmitted in each of the several consecutive second symbols of the subframe, where the second several consecutive symbols are after the first several consecutive symbols within the subframe.
[0033] Another device for non-wired communication is described. The device may include a processor, a memory in electronic communication with the processor and instructions stored in memory. The instructions can be operable to make the processor generate an SSS based, at least in part, on a group of cell identifiers associated with the base station; and transmit the SSS and a PSS in a subframe of a frame, where the PSS is transmitted in each of the several
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13/94 first consecutive symbols of the subframe and where the SSS is transmitted in each of the several consecutive second symbols of the subframe, where the several second consecutive symbols are after the first several consecutive symbols within the subframe.
[0034] A non-temporary, computer-readable medium for non-wired communication is described. The computer-readable non-temporary medium may include operable instructions to have a processor generate an SSS based, at least in part, on a group of cell identifiers associated with the base station; and transmit the SSS and a PSS in a subframe of a frame, where the PSS is transmitted in each of the several consecutive first symbols of the subframe and where the SSS is transmitted in each of the several consecutive second symbols of the subframe, where the several seconds consecutive symbols are after the first several consecutive symbols within the subframe.
[0035] In some examples of the computer-readable method, apparatus and non-temporary medium described above, the first several consecutive symbols include fourteen or less consecutive symbols in the subframe.
[0036] In some examples of the computer-readable method, apparatus and non-temporary medium described above, the several second consecutive symbols include fourteen or less consecutive symbols in the subframe.
[0037] In some examples of the computer-readable method, apparatus and non-temporary medium described above, a sequence of coverage code, associated with the PSS, is a binary coverage code.
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[0038] In some examples of the computer-readable method, apparatus and non-temporary medium described above, the SSS is associated with a group of cell identifiers, associated with the base station, and with a subframe offset associated with a reference signal.
BRIEF DESCRIPTION OF THE DRAWINGS
[0039] FIG. 1 illustrates an example of a system for non-wired communication that supports synchronization to improve broadband coverage in accordance with aspects of the present disclosure.
[0040] FIG. 2 illustrates an example of a non-wired communications system that supports synchronization to improve broadband coverage in accordance with aspects of the present disclosure.
[0041] FIG. 3 illustrates an example of a frame structure that supports synchronization to improve broadband coverage in accordance with aspects of the present disclosure.
[0042] FIG. 4 illustrates an example of a process flowchart that supports synchronization for the improvement of broadband coverage in accordance with aspects of the present disclosure.
[0043] FIG. 5 illustrates an example of a primary sync signal encoder (PSS) and a secondary sync signal encoder (SSS) that supports synchronization for the improvement of broadband coverage in accordance with aspects of the present disclosure.
[0044] FIG. 6 illustrates an example of tables that support synchronization for improving the
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15/94 broadband coverage according to aspects of the present disclosure.
[0045] FIGS. 7A and 7B illustrate an example of subframes that support synchronization for the improvement of broadband coverage in accordance with aspects of the present disclosure.
[0046] FIGS. 8A and 8B illustrate an example of subframes that support synchronization for the improvement of broadband coverage in accordance with aspects of the present disclosure.
[0047] FIG. 9 illustrates an example of a PSS detector that supports synchronization for improving broadband coverage in accordance with aspects of the present disclosure.
[0048] FIG. 10 illustrates an example of an SSS detector that supports synchronization for improving broadband coverage in accordance with aspects of the present disclosure.
[0049] FIGS. 11 to 13 show block diagrams of a device that supports synchronization for the improvement of broadband coverage according to aspects of the present disclosure.
[0050] FIG. 14 illustrates a block diagram of a system including a UE that supports synchronization for the improvement of broadband coverage in accordance with aspects of the present disclosure.
[0051] FIGS. 15 through 17 present block diagrams of a device that supports synchronization to improve broadband coverage in accordance with aspects of the present disclosure.
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[0052] FIG. 18 illustrates a block diagram of a system including a base station that supports synchronization for the improvement of broadband coverage in accordance with aspects of the present disclosure.
[0053] FIGS. 19 through 22 illustrate methods for synchronization to improve broadband coverage in accordance with aspects of the present disclosure.
DETAILED DESCRIPTION
[0054] Unwired communications systems, as described in this document, can be configured to configure and transmit synchronization signals within subframes of a frame to assist user equipment (UE) in initial acquisition and communication with a base station . In some examples, the UE can process the sync signals (for example, the primary sync signal (PSS) and the secondary sync signal (SSS)) to obtain the symbol timing and subframe timing from a base station to acquire reference signal transmissions for decoding a channel.
[0055] Detecting PSS timing and correcting the initial frequency shift are bottlenecks that prolong the amount of time for a UE to perform the initial acquisition. In conventional solutions, a base station can transmit the subframes carrying the PSS and SSS within the measurement reference timing (DMTC) configuration windows of the discovery reference signal (DRS) that occur periodically (for example, every 80, 160 or 320 milliseconds). Normally, PSS and SSS are transmitted only once within a periodicity
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DMTC and PSS / SSS is found only in the first 32 milliseconds (for example, 5 bits of information from the subframe) of the DMTC window.
[0056] Conventional solutions to detect PSS timing may not adequately meet SNR dB specifications to obtain probabilities of detecting an attempt. A probability of detecting an attempt is the probability of detecting PSS and SSS in a single DMTC window. For example, MuLTEfire (MF) systems can specify the detection of a two-symbol PSS at an SNR = -4.5 dB. As another example, MF systems can specify a specific probability of detecting an attempt (for example, 50%) at SNR = 10.5 dB. Some systems can specify detection at even lower SNRs. In some cases, at least 12 symbols from the PSS can be combined to achieve detection at low SNRs. However, conventional solutions use only two PSS symbols per subframe and, therefore, a UE may have to monitor 12 symbols spread across 6 different subframes to achieve the desired PSS / SSS detection probability in an attempt. In MF systems, two PSS symbols and two SSS symbols can be carried within a single DMTC window, but combining the PSS and SSS symbols across the various DMTC windows can be challenging due to the floating timing between the windows. In addition, using multiple subframes to detect PSS and SSS is not suitable for systems that operate in listening before speaking (LBT) environments. Additional buffer hardware can be used to enable PSS symbols
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18/94 received during PSS detection.
[0057] The additional complication of PSS timing detection is that conventional techniques for performing PSS detection do not adequately consider frequency discrepancies between the UE and the base station, nor do they adequately reduce noise. In conventional techniques to perform PSS detection, a UE can receive a signal and divide 12 symbols with time assumptions τ into 12 column vectors ”l ^r 0 ' ^r l' • '' Tl], the UE can perform the correlation cross with PSS symbol p and coverage code s _m for each symbol to generate cross correlation symbols: ~ '•• ί'ιι] ~ P [ ^s o ^r oí ^s i ^r i * - ^ ιι ^Γ ιι] q can run PSS coherently combining C symbols for ~ Jy y ,, y 1 use the following equations: ° ¹ '' * ^-1 , ”--- I v * c eXcm + e. who can then calculate a non-coherent cost function by combining the correlation symbols _ Í ly l ² crossed using the following equation: ^{N mm} '. The UE can detect the PSS using the following equation: maxi— ™] <> threshold τ ¹ Μ ^} . The UE can retain the main N hypotheses of τ and frequency index for validation during SSS detection.
[0058] Because the UE and the base station can operate at slightly different frequencies, the UE is unable to determine a frequency shift limit to account for the frequency discrepancy. The uncertainty at the frequency shift limit disadvantageously limits the number of symbols that the UE can consistently combine into two symbols (for example, the
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19/94 maximum frequency shift is 5 KHz and the coherence time is 90 microseconds). In addition, the non-coherent combination only provides gains from fading diversity, but does not reduce noise.
[0059] Even after PSS and SSS have been detected, a UE must then determine the location of one or more reference signals in one or more subframes. In some cases, a DRS transmission to the UE may measure a complete transmission opportunity (for example, about 6-7 subframes, including a subframe for inherited DRS). The UE can process the reference signals to determine how to decode a physical broadcast channel (PBCH) from the frame. The PBCH can include information that the UE can use for cell acquisition, such as a master information block (MIB) and a system information block (SIB).
[0060] In many cases, the base station scrambles the reference signal and transmits the scrambled reference signal within one or more subframes. The UE must determine a scrambling rule to be used to decode the reference signal to decode the PBCH. A subframe number indication can indicate which scrambling rule to use. In joint signaling, the UE can process the SSS to determine the indication of the subframe number which indicates the location of a PBCH (for example, 5 bits indicating the location of the PBCH) within the DMTC window. The scrambling rules can be associated with the location of the PBCH, and the UE can select the scrambling rule based on the determined location of the PBCH. In independent signaling, the
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PBCH may include the indication of the subframe number indicating which scrambling rule to be applied, and the UE may need to follow a set of scrambling rules to derive the indication of the subframe number.
[0061] The examples described in this document can provide an improved detection rate of PSS and SSS from an attempt. For example, a base station can transmit a PSS sequence and an SSS sequence, each in a unique symbol period of a given subframe, and can transmit the same PSS sequence and the same SSS sequence in the respective unique symbols of other subframes. In this example, in a first subframe, the base station can transmit the PSS sequence after the SSS sequence and before a set of sequences corresponding to a set of other synchronization signals (for example, an inherited PSS, an inherited SSS). In other subframes (for example, the subframes after the first subframe), the base station can transmit the PSS sequence after the set of sequences corresponding to the set of other synchronization signals and before the SSS sequence. Transmitting the PSS sequence and SS sequence in this way provides improved detection probability in an attempt by a UE within a single DMTC window without negatively impacting the synchronization of legacy UEs (for example, UEs that synchronize based on the inherited and transmitted PSS and SSS in the DMTC window).
[0062] As another example, the base station can transmit the same PSS sequence in several consecutive symbol periods within a single subframe (eg
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21/94 example, a set of 6 consecutive symbol periods in the subframe) and can transmit the same SSS sequence in several consecutive symbol periods within the single subframe (for example, a set of 6 consecutive symbol periods of the subframe). In other words, the base station can repeatedly transmit the PSS sequence and the SSS sequence within a single subframe. Transmitting the PSS sequence and the SSS sequence in this way provides probability of detecting an enhanced attempt by a UE within a single DMTC window. In addition, having all the PSS symbols in a single subframe beneficially saves the storage hardware and allows a UE to perform correlation calculations for various timing assumptions within a single DMTC window. In addition, the techniques described in this document can encode a group of cell identifiers, a subframe offset for a reference signal, or both in the SSS sequence that can be used to determine the subframe timing and a scramble rule for the signal of reference. The techniques described in this document beneficially reduce the duration of cell acquisition by the UE and provide an improved detection rate of PSS and SSS from an attempt.
[0063] The aspects of disclosure are initially described in the context of an unwired communications system. The non-wired communications system can provide enhanced detection of PSS and SSS to reduce the duration of cell acquisition. The aspects of the development are further illustrated and described with reference to the device diagrams,
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22/94 system diagrams and flowcharts related to synchronization to improve broadband coverage.
[0064] FIG. 1 illustrates an example of a non-wired communications system 100 in accordance with various aspects of the present disclosure. The non-wired communications system 100 includes base stations 105, UEs 115 and a main network 130. In some instances, the non-wired communications system 100 may be a Long Term Evolution (LTE), LTE-Advanced network ( LTE-A) or a Nova Rádio (NR) network. In some cases, the wired communications system 100 can support enhanced broadband communications, ultra-reliable (ie, mission-critical) communications, low-latency communications, and communications with low-cost and low-complexity devices . In some respects, base station 105-a can transmit a PSS sequence and an SSS sequence, each in a unique symbol period for a given subframe, and can transmit the same PSS sequence and the same SSS sequence in other subframes, such as described in this document. In some respects, the base station 105-1 can transmit a PSS sequence and an SSS sequence within consecutive symbol periods of a frame subframe to reduce the duration of cell acquisition and / or improve a probability of PSS detection and SSS of an attempt.
[0065] Base stations 105 can communicate in a non-wired manner with UEs 115 via one or more base station antennas. Each base station 105 can provide communication coverage for an area
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23/94 respective coverage geographic 110. Communication links 125 shown in the non-wired communications system 100 may include uplink transmissions from UE 115 to base station 105 or downlink transmissions from base station 105 for a UE 115. Control information and data can be multiplexed on an uplink or downlink channel according to various techniques. Control information and data can be multiplexed on a downlink channel, for example, using time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques or hybrid TDM-FDM techniques. In some examples, control information transmitted during a transmission time interval (TTI) of a downlink channel can be distributed between different control regions in a cascade mode (for example, between a common control region and a or more EU-specific control regions).
[0066] UEs 115 can be dispersed via the non-wired communications system 100 and each UE 115 can be stationary or mobile. A UE 115 can also be referred to as a mobile station, a subscriber station, a mobile unit, a subscriber unit, an un-wired unit, a remote unit, a mobile device, an un-wired device, an un-wired communications device , a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a non-wired terminal, a remote terminal, a handset, a user agent, a mobile client, a customer or some other suitable terminology. An UE 115 can also be a
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24/94 cell phone, a personal digital assistant (PDA), an unwired modem, an unwired communication device, a handheld device, a tablet computer, a laptop computer, a cordless phone, a personal electronic device, a portable device, a personal computer, a local non-wired loop station (WLL), an Internet of Things (loT) device, an Internet of Everything (ToE) device, a machine-type communication device (MTC), a appliance, a car, and / or, among others.
[0067] In some cases, a UE 115 may also be able to communicate directly with other UEs (for example, using a point-to-point protocol (P2P) or device to device (D2D)). One or more of a group of UEs 115 using D2D communications can be within coverage area 110 of a cell. Other UEs 115 in such groups may be outside coverage area 110 of a cell or otherwise unable to receive transmissions from a base station 105. In some cases, groups of UEs 115 communicating via D2D communications they can use a one to several system (1: M) in which each UE 115 transmits to each other UE 115 of the group. In some cases, a base station 105 makes it easy to program resources for D2D communications. In other cases, D2D communications are carried out independently of a base station 105.
[0068] Some UEs 115, such as MTC or ToT devices, can be low cost or low complexity devices and can provide automated communication between machines, that is,
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25/94 Machine to Machine (M2M) communication. M2M and MTC communication can refer to data communication technologies that allow devices to communicate with each other or with a base station without human intervention. For example, M2M or MTC can refer to communications from devices that integrate sensors or meters to measure or capture information and relay this information to a central server or application program that can make use of the information or present the information to humans. interacting with the program or application. Some UEs 115 can be designed to collect information or allow automated behavior of machines. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, health monitoring, wildlife monitoring, climatic and geological event monitoring, fleet management and tracking, security sensing remote access, physical access control and transaction-based business charging.
[0069] In some cases, an MTC device can operate using half-duplex (unidirectional) communications at a reduced peak rate. MTC devices can also be configured to enter energy-saving deep sleep mode when they are not involved in active communications. In some cases, MTC or loT devices can be designed to support mission critical functions and the non-wired communications system can be configured to
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26/94 provide ultra-reliable communications for these functions.
[0070] The base stations 105 can communicate with the main network 130 and with each other. For example, base stations 105 can interact with main network 130 through return transport channel links 132 (e.g., SI, etc.). Base stations 105 can communicate via return transport channel links 134 (for example, X2, etc.) directly or indirectly (for example, through main network 130). Base stations 105 can perform radio configuration and programming for communication with UEs 115 or can operate under the control of a base station controller (not shown). In some examples, base stations 105 can be macro cells, small cells, access points and / or, among others. Base stations 105 can also be referred to as evolved NodeBs (eNBs) 105.
[0071] A base station 105 can be connected by an SI interface to the main network 130. The main network can be an evolved packet core (EPC), which can include at least one mobility management entity (MME), at least least one server gateway (S-GW) and at least one Packet Data Network (PDN) gateway (P-GW). The MME can be the control node that processes the signaling between the UE 115 and the EPC. All user's Internet Protocol (IP) packets can be transferred via S-GW, which can be connected with P-GW. The P-GW can provide IP address allocation, as well as other functions. The P-GW can be connected to the IP services of network operators. Operators' IP services can
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27/94 include the Internet, the Intranet, an IP Multimedia Subsystem (IMS) and a Switched Packet Streaming Service (PS).
[0072] The main network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity and other access, routing or mobility functions. At least some of the network devices, such as base station 105, can include subcomponents, such as an access network entity, which can be an example of an access node controller (ANC). Each access network entity can communicate with several UEs 115 through several other access network transmission entities, each of which can be an example of an intelligent radio head or a transmit / receive point (TRP) . In some configurations, various functions of each access network entity or base station 105 can be distributed across multiple network devices (for example, radio heads and access network controllers) or consolidated into a single network device (for example, a base station 105).
[0073] The wired communications system 100 can operate in an ultra high frequency frequency (UHF) region using frequency bands from 700 MHz to 2600 MHz (2.6 GHz), although some networks (for example, a non-wired local area network (WLAN) can use frequencies as high as 4 GHz. This region can also be known as the decimetric band, as wavelengths vary from approximately one decimeter to one meter in length. UHF waves can propagate
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28/94 mainly by line of sight and can be blocked by buildings and environmental characteristics. However, the waves can penetrate the walls enough to provide service to the UEs 115 located indoors. The transmission of UHF waves is characterized by smaller antennas and shorter range (for example, less than 100 km) compared to transmission using the lower frequencies (and longer waves) of the high frequency (HE) spectrum or very frequency high (VHF). In some cases, the wired communications system 100 may also use parts of the extremely high frequency (EHF) spectrum (for example, from 30 GHz to 300 GHz). This region can also be known as the millimeter band, since the wavelengths vary from approximately one millimeter to one centimeter in length. Thus, EHF antennas can be even smaller and more closely spaced than UHF antennas. In some cases, this may facilitate the use of antenna arrays within an UE 115 (for example, for directional beam shaping). However, EHF transmissions can be subject to even greater atmospheric attenuations and shorter distances than UHF transmissions.
[0074] Thus, the non-wired communications system 100 can support millimeter wave (mmW) communications between UEs 115 and base stations 105. Devices operating in mmW or EHF bands can have multiple antennas to allow for beam forming . That is, a base station 105 can use multiple antennas or antenna sets to conduct
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29/94 beam conformation for directional communications with a UE 115. Beam conformation (which can also be referred to as spatial filtering or directional transmission) is a signal processing technique that can be used on a transmitter (for example , a base station 105) for shaping and / or directing a general antenna beam towards a target receiver (e.g., UE 115). This can be achieved by combining elements in a set of antennas so that signals transmitted at particular angles experience constructive interference, while others experience destructive interference.
[0075] Multi-input and multi-output (MIMO) non-wired systems use a transmission scheme between a transmitter (for example, a base station 105) and a receiver (for example, a UE 115), where the transmitter and the receiver is equipped with several antennas. Some parts of the non-wired communications system 100 may use the beam conformation. For example, base station 105 may have a set of antennas with a number of rows and columns of antenna ports that base station 105 can use to form beams in its communication with UE 115. Signals can be transmitted multiple times in different directions (for example, each transmission can be beam shaped differently). An mmW receiver (for example, a UE 115) can test multiple beams (for example, subsets of antennas) while receiving the synchronization signals.
[0076] In some cases, the antennas of a
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30/94 base station 105 or UE 115 can be located within one or more antenna arrays, which can support beam forming or MIMO operation. One or more base station antennas or antenna sets can be co-located in an antenna mount, such as an antenna tower. In some cases, the antennas or antenna sets associated with a base station 105 may be located in several geographic locations. A base station 105 can use multiple antennas or antenna sets to perform beam forming operations for directional communications with an UE 115.
[0077] In some cases, the non-wired communications system 100 may be a packet-based network that operates according to a layered protocol stack. At the user level, carrier communications or the Packet Data Convergence Protocol (PDCP) layer can be IP based. A Radio Link Control (RLC) layer can, in some cases, perform the segmentation and reassembly of packets to communicate through logical channels. A Medium Access Control (MAC) layer can perform priority handling and multiplexing of logical channels in transport channels. The MAC layer can also use the Hybrid ARQ (HARQ) to provide retransmission in the MAC layer to improve the efficiency of the link. In the control plane, the Radio Resource Control (RRC) protocol layer can provide for establishing, configuring and maintaining an RRC connection between a UE 115 and a network device, base station 105 or network
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Main 31/94 130 that support radio carriers for user plan data. In the Physical layer (PHY), transport channels can be mapped to physical channels.
[007 8] The time intervals in LTE or NR can be expressed in multiples of a basic unit of time (which can be a sampling period of Ts = 1 / 30,720,000 seconds). Time resources can be organized according to 10 ms radio frames (Tf = 307200T _s ), which can be identified by a system frame number (SFN) ranging from 0 to 1023. Each frame can include ten 1 ms subframes, numbered 0 to 9. A subframe can be further divided into two 5 ms partitions, each of which contains 6 or 7 modulation symbol periods (depending on the length of the cyclic prefix attached to each symbol). Excluding the cyclic prefix, each symbol contains 2048 sampling periods. In some cases, the subframe may be the smallest programming unit, also known as a TTI. In other cases, a TTI may be shorter than a subframe or selected dynamically (for example, in short bursts of TTI or in selected component carriers using short TTIs).
[0079] A feature element may consist of a symbol period and a subcarrier (for example, a frequency range of 15 KHz). A resource block can contain 12 consecutive subcarriers in the frequency domain and, for a normal cyclic prefix in each OFDM symbol, 7 consecutive OFDM symbols in the time domain (1 partition) or 84 resource elements. The number of bits carried by each resource element can
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32/94 depend on the modulation scheme (the configuration of the symbols that can be selected during each symbol period). Thus, the more blocks of resources a UE receives and the larger the modulation scheme, the higher the data rate can be.
[0080] The non-wired communications system 100 can support operation in multiple cells or carriers, a feature which can be referred to as carrier aggregation (CA) or operation of multiple carriers. A carrier can also be referred to as a component carrier (CC), a layer, a channel, etc. The terms carrier, component carrier, cell and channel can be used interchangeably in this document. A UE 115 can be configured with several downlink CCs and one or more uplink CCs for the carrier aggregation. The carrier aggregation can be used with the component carriers FDD and TDD.
[0081] In some cases, the wired communications system 100 may use enhanced component carriers (eCCs). An eCC can be characterized by one or more features, including: broader bandwidth, shorter average symbol life, shorter TTIs and modified control channel configuration. In some cases, an eCC may be associated with a carrier aggregation configuration or with a dual connectivity configuration (for example, when multiple server cells have a suboptimal or not ideal return transport channel link). An eCC can also be configured for use in unlicensed or shared spectrum (where more than one
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33/94 operator can use the spectrum). An eCC characterized by broadband bandwidth can include one or more segments that can be used by UEs 115 that are not able to monitor all bandwidth or prefer to use limited bandwidth (for example, to save energy).
[0082] In some cases, an eCC may use a different symbol duration than other CCs, which may include the use of a reduced symbol duration compared to the symbol duration of the other CCs. A shorter symbol life is associated with increased sub carrier spacing. A device, such as a UE 115 or a base station 105, using eCCs can transmit broadband signals (for example, 20, 40, 60, 80 MHz, etc.) in short symbol durations (for example, 16.67 microseconds). A TTI in the eCC can consist of one or more symbols. In some cases, the duration of the TTI (that is, the number of symbols in a TTI) can be variable.
[0083] A shared radio frequency spectrum band can be used in an NR shared spectrum system. For example, a shared NR spectrum can use any combination of licensed, shared and unlicensed spectra, among others. The flexibility of the eCC symbol duration and the spacing between subcarriers may allow the use of eCC in various spectra. In some instances, the shared NR spectrum can increase spectrum usage and spectral efficiency, specifically through dynamic sharing of data.
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34/94 vertical (for example, through frequency) and horizontal (for example, through time) resources.
[0084] In some cases, the non-wired communications system 100 may use the licensed and unlicensed radio spectrum band. For example, the non-wired communications system 100 may employ LTE Unlicensed Radio Access Technology (LTE U) or LTE License Assisted Access Technology (LTE-LAA) or NR technology in an unlicensed band such as the 5 Ghz Industrial, Scientific and Medical (ISM) band. When operating on unlicensed radio spectrum bands, on un-wired devices, such as base stations 105 and UEs 115, they can employ listening before speaking (LBT) procedures to ensure that the channel is clear before transmitting data. In some cases, operations on unlicensed bands may be based on a CA configuration in conjunction with CCs operating on a licensed band. Operations on the unlicensed spectrum may include downlink transmissions, uplink transmissions, or both. Duplexing in the unlicensed spectrum can be based on frequency division duplexing (FDD), time division duplexing (TDD) or a combination of both.
[0085] In some examples described in this document, base station 105 can transmit a PSS sequence and an SSS sequence, each in a single symbol period of a given subframe, and can transmit the same PSS sequence and the same SSS sequence in other subframes. In other examples described in this document, the station
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Base 105/94 can transmit a PSS sequence and an SSS sequence within consecutive symbol periods of a single subframe. Transmitting the PSS sequence and the SSS sequence in the ways mentioned above can reduce the duration of cell acquisition by a UE 115 and / or improve the probability of detecting PSS and SSS in an attempt by the UE 115.
[0086] FIG. 2 illustrates an example of a non-wired communications system 200 that supports synchronization to improve broadband coverage in accordance with various aspects of the present disclosure. Unwired communications system 200 includes base station 105-a and UE 115-a, which can be examples of aspects of the corresponding devices, as described above with reference to FIG. 1. In the example of FIG. 2, the non-wired communications system 200 can operate according to a radio access technology (RAT), such as a RAT LTE, 5G or new radio (NR), although the techniques described in this document can be applied to any RAT and systems that can use two or more different RATs simultaneously.
[0087] Base station 105-a can communicate with UE 115-a through a downlink carrier 205 and an uplink holder 215. In some cases, base station 105-a can transmit frames 210 on resources of time and frequency allocated using the downlink bearer 205. The transmitted frames 210 may include synchronization signals that can be used by the UE 115-a for cell acquisition. In some cases, the base station 105a can transmit using the mmW frequencies.
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36/94
[0088] FIG. 3 illustrates an example of a frame structure 300 that supports synchronization to improve broadband coverage in accordance with various aspects of the present disclosure. The transmission timeline on the downlink can be divided into radio frame units. Each radio frame can have a defined duration (for example, 10 milliseconds (ms)) and can be divided into a defined number of subframes having corresponding indices (for example, 10 subframes with indices from 0 to 9). Each subframe can include two partitions. Each radio frame 210 can include 20 partitions with indexes from 0 to 19. Each partition can include L symbol periods, for example, L = 7 symbol periods for a normal cyclic prefix (as shown in FIG. 2) or L = 6 symbol periods for an extended cyclic prefix. The 2L symbol periods in each subframe can receive indexes from 0 to 2L 1. The available time and frequency resources can be divided into resource blocks. Each resource block can cover N subcarriers (for example, 12 subcarriers) in one partition. Various resource elements may be available in each symbol period. Each resource element (ER) can cover a subcarrier in a symbol period and can be used to send a modulation symbol, which can be a real or complex value. Resource elements not used for a reference signal in each symbol period can be organized into groups of resource elements (REGs). Each REG can include four resource elements in a symbol period. In some cases, a DMTC window
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37/94 can be defined within a subframe that can be used to transport the PSS, the SSS or both.
[0089] FIG. 4 illustrates an example of a process flowchart 400 that supports synchronization to improve broadband coverage in accordance with various aspects of the present disclosure. In flowchart 400, a base station 105-a can transmit frames including the synchronization signals that UE 115-a can use to obtain symbol and subframe timing for cell acquisition.
[0090] In 405, the base station 105-a can configure the synchronization signals for transmission in a frame.
[0091] In one example, the synchronization signals can include a PSS sequence and an SSS sequence, where each of the PSS sequence and the SSS sequence is transmitted in the respective unique symbol periods of a given subframe. Here, in a first subframe, the PSS sequence is transmitted after the SSS sequence and before a set of other sequences corresponding to a set of other synchronization signals (for example, an inherited PSS, an inherited SSS). In other subframes (for example, three subframes after the first subframe), the PSS sequence is transmitted after the set of sequences corresponding to the set of other synchronization signals and before the SSS sequence. In other words, in other subframes, the location of the PSS sequence and the SSS sequence is replaced by the location of the set of other sequences (for example, when compared to the first subframe), and the PSS is transmitted
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38/94 before SSS (for example, instead of after SSS as in the first subframe).
[0092] In another example, synchronization signals may include a PSS sequence transmitted in a first set of consecutive symbols in a subframe and an SSS sequence transmitted in a second set of consecutive symbols in a subframe. As a particular example, the PSS sequence can be transmitted six times in the subframe, where each transmission of the PSS sequence is in one of a first set of six consecutive symbols in the subframe (for example, symbols 2 to 7). Here, the SSS sequence can also be transmitted six times in the subframe, where each transmission of the SSS sequence is in one of a second set of six consecutive symbols in the subframe (for example, symbols 8 through 13).
[0093] To enable robust detection of the PSS, the PSS can be a single sequence. In some examples, base station 105-a can transmit PSS and SSS around a central frequency of system bandwidth allocated to transmit frames 210. Additional aspects of the PSS and SSS configuration are described below in the FIGs. 5 to 8B.
[0094] In 410, base station 105-a can transmit frames 210 including PSS and SSS. In 415, UE 115-a can use for frames 210 to start cell acquisition. In one example, the UE 115-a can be turned on and start looking for a cell to connect to.
[0095] In 420, the UE 115-a can perform the
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39/94 cross correlation and automatic correlation to detect the PSS and determine the symbol timing of the symbol periods of the subframes transmitted by the base station 105. The timing of the symbols can allow the UE 115-a to detect the limits of each symbol within of a frame 210. When the PSS is transmitted in any of the ways described above, the probability of the UE 115-a to detect the PSS and determine the symbol timing within a single DMTC window is improved, thus resulting in an improved rate of PSS detection of an attempt. Additional aspects of PSS detection are described below in FIG. 9.
[0096] In 425, UE 115-a can use symbol timing to generate an SSS from a signal received from the base station and determine the SSS-based subframe timing. Additional aspects of SSS detection are described below in FIG. 10.
[0097] At 430, UE 115-a can determine a subframe offset from the SSS and determine a scrambling rule for a reference signal based on the subframe offset. In some examples, a reference signal may be a discovery reference signal (DRS), a cell-specific reference signal (CRS), a channel status information reference signal (CSI-RS) and / or, among others.
[0098] In 435, UE 115-a can unscramble the reference signal using the scrambling rule and decode a channel of frame 210 using the scrambled reference signal. Additional aspects of
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40/94 unscrambling are described below in FIG. 10. In 440, UE 115-a can complete cell exchange and acquisition traffic with base station 105-a using symbol and subframe timing.
[0099] FIGS. 5 through 8B represent additional aspects of the base station 105-a setting the PSS and SSS to 415. FIG. 5 illustrates an example of the diagram 500 of a PSS encoder and an SSS encoder that supports synchronization for the improvement of broadband coverage in accordance with various aspects of the present disclosure. A 105-a may include a base station PSS encoder 505 and encoder 515. The SSS PSS encoder 505 may receive a sequence a sequence of PE PSS ^s coverage issue a code sequence coded I PSS 510. EP PSS sequence may P. be a unique sequence that is known to each of the 105-a and UE 115-a base stations to improve the robustness of PSS detection. In one example, the sequence PSS can have a sequence of length 63 and, in some examples, it can be a Zadoff-Chu (ZC) sequence with a specific root index. In some respects, the PSS sequence may correspond to a cell identifier associated with base station 105-a. For example, the PSS sequence can be generated based on a specific root in a set of roots (for example, 25, 29, and 34), where each root in the set of roots corresponds to a different cell identifier than a set of cell (e.g., 0, 1 and 2) associated with base station 105-a. In some respects, the UE 115 can determine a physical cell identity, associated with base station 105-a, based at least in part on the
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41/94 cell identifier derived from the PSS and in a group of cell identifiers derived from the SSS, as described below.
[00100] The coverage code sequence ^s m can be a binary code selected to have low correlation with other sequences. An example of the coverage code sequence ^s m is ^s m = [S0, Sl, .... SX] = [11 11-1-1111-11 -1 -1]. In some ways, the coverage code may be a non-binary code. X can be an integer and can correspond to the number of consecutive symbol periods within a subframe in which a PSS is sent. In one example, the PSS 505 encoder can multiply the PSS sequence by a cover code sequence ^s m to generate the PSS EP sequence.
[00101] The SSS 515 encoder can receive bits from the group of cell identifiers and subframe shift bits, and output the code words from an alphabet, each of which is mapped to an SSS sequence. The cell identifier group bits can carry a group of cell identifiers from the base station 105-a. For example, a group of cell identifiers can be used to signify the base station as being included in one of a defined number of groups of cell identities (for example, one of 168 groups of cell identifiers). The offset bits of the subframe can indicate an offset of a reference signal (for example, DRS) in relation to the beginning of a frame 210. The offset of the subframe may mean which of the various scrambling rules to use to unscramble the signal.
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42/94 reference. UE 115-a can use the scrambled reference signal to decode a PBCH.
[00102] In some examples, the SSS 515 encoder may be a shortened Reed Solomon (RS) encoder operating on a Galois Field (GF) of 16. A shortened Reed Solomon encoder can convert the input bits (for example, 8 corresponding bits to the group of cell identifiers and 4 or 5 bits corresponding to the subframe shift) for a code word within an alphabet of code words. For example, the shortened Reed Solomon encoder can generate a shortened RS code in GE (16) with the message length k = 3 and the length of the code word N = 6 or 7. A polynomial generator for a shortened RS code (6 or 7.3) is g (x) - Πί4ι ( ^χ + ^αί ), where α is the primitive element based on the primitive polynomial PÍX) - + In some examples, a minimum distance can be be specified for the shortened RS code (e.g., the distance RS code is ^{dmin = 4/5)} the .
[00103] The SSS 515 encoder can provide a mapping between an alphabet GE (16) A to an alphabet B, where each alphabet A and B is a defined number of bits (for example, 4 bits). The alphabet A can include a set of code words [A1, A2, A3, A4] that the SSS 435 encoder can map to a set of code words [Bl, B2,. . ., BN] in alphabet B. The SSS 435 encoder can output the code words Bl, B2 ,. . ., BN from alphabet B to mapper 520.
[00104] The 520 mapper can determine a value
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43/94 of each code word Bl, B2,. . ., BN that can be used to index a table to generate an SSS string. FIG. 6 illustrates an example of tables 600-a, 600-b that support synchronization for the improvement of broadband coverage in accordance with various aspects of the present disclosure. Table 600-a can include indexes 605-a that correspond to the root μ 610-a and a cyclic shift η 615-a. In some examples, the two sequences with roots RI and R2, or R3 and R4, can be complex symmetrically. The SSS sequence can be encoded with the group of cell identifiers and optionally with the offset of the subframe, and the UE 115-a can decode a set of SSS sequences to determine the group of cell identifiers and, optionally, the offset of the subframe. In an example, suppose that BI = 0, mapper 520 retrieves the root RI and the cyclic offset Cll for the index k = 0 from table 600 and generates the sequence SSS SI as a function of the root RI and the cyclic offset Cll. The SS sequence can be, for example, a ZC sequence. Suppose that B2 = 7, the mapper 520 retrieves the root R2 and the cyclic offset C24 corresponding to the index k = 7 from table 600 and generates an SSS sequence S2 as a function of the root R2 and the cyclic offset C24. This process can be repeated to generate SSS sequences S3 to SN, corresponding to code words B3, respectively. . . BN. Table 600-b represents illustrative values of a root μ 610-b and a cyclic shift η 615-b for the different indices 605-b. In some examples, the root 9 and 54 and the root 13 and 50 are complex conjugates, and cyclical shifts within a root can be
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44/94 maximized.
[00105] Base station 105-a can map the PSS encoded EPl sequence to EPN and the SSS Sl sequences to SN to particular OFDM symbols and subcarriers within a channel bandwidth to transmit to UE 115-a. FIGS. 7A and 7B illustrate an illustrative diagram 700 of subframes that support synchronization to improve broadband coverage and FIGS. 8A and 8B illustrate an illustrative diagram 800 of subframes that support synchronization for the improvement of broadband coverage, in accordance with various aspects of the present disclosure. In illustrative diagrams 700 and 800, time is plotted from left to right and frequency is plotted from top to bottom. The base station 105-a can allocate time and frequency resources for the transmission of frames.
[00106] In the illustrative diagram 700, the bandwidth of channel 705 measures a part of available frequencies, and the OFDM symbols from 0 to 13 of each subframe 305-a to 305-d within the 705 bandwidth are labeled in the part allocation of resources. As discussed above, the PSS and SSS can be transported on the R subcarriers 710, centered within the 705 bandwidth. Each of the R subcarriers 710 can be moved by each other in frequency (for example, 15 kHz between each subcarrier). As shown in illustrative diagram 700, to assist in PSS detection, base station 105-a can transmit PSS within a set of consecutive subframes (for example, within symbol 3 of subframe 305-a, within symbol 5 of each one of the
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45/94 subframes 305-b to 305-d). For example, if R = 63, and the PSS p sequence can be a ZC sequence having a length of 63, the 63 complex numbers of the ZC sequence can be mapped to 63 subcarriers centered within the 705 bandwidth. As described above, the ZC sequence can be selected based at least in part on a cell identifier associated with base station 105-a (for example, one of the three ZC sequences can be selected). The same R 710 subcarriers can also be used to transport the SSS and PBCH (or the PBCH extension (PBCH Ex)) in subframes 305-a through 305-d. For example, to assist in SSS detection, base station 105-a can transmit the SSS within the set of consecutive subframes (for example, within symbol 2 of subframe 305-a, within symbol 6 of each of subframes 305- b to 305-d).
[00107] Unlabeled parts of the time and frequency resources of subframes 305-a through 305-d can be used to carry other information, such as, for example, inherited DRS, inherited PSS, inherited SSS, MF 1.0 ePSS, MF 1.0 eSSS, Legacy Downlink Physical Control Channel (PDCCH), SIB, MF SIB, PDCCH for SIB and / or, among others.
[00108] As shown in illustrative diagram 700, each of the PSS and SSS is transmitted in the respective periods of unique symbols of a given subframe. As shown in subframe 305-a, the PSS sequence can be transmitted after the SSS sequence (for example, the PSS can be transmitted at symbol 3, while the SSS can be transmitted at symbol 2) and before
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46/94 of an inherited SSS and an inherited PSS (for example, transmitted in symbol 6 and symbol 5, respectively). As shown in subframes 305-b through 305-d, the PSS sequence can be transmitted before the SSS sequence (for example, the PSS can be transmitted at symbol 5, while the SSS can be transmitted at symbol 6) and after the inherited PSS and the inherited SSS (for example, transmitted in symbol 2 and symbol 3, respectively).
[00109] In this example, in subframes 305-b through 305-d, the PSS is transmitted before the SSS (for example, in instead of after the SSS as in subframe 305-a). In some respects, transmitting the PSS before the SSS (for example, instead of after the SSS as in subframe 305-a) prevents an inherited UE (for example, a UE that uses the legacy PSS and the legacy SSS alone to perform synchronization) try synchronization based on PSS and SSS, thus saving battery power and / or the resources of the legacy UE processor. For example, since no SSS is present before PSS in subframes 305-b to 305-d, the legacy UE will interrupt a synchronization procedure and / or will not attempt to decode a PBCH associated with these subframes, which saves battery power and / or the processor resources of the legacy UE.
[00110] Additionally, in subframes 305-b through 305-d, the location of the PSS and SSS is exchanged with the location of the inherited PSS and the inherited SSS (for example, in comparison with sub-frame 305-a). For example, in subframe 305-a, SSS and PSS are transmitted in symbols 2 and 3, respectively, and inherited SSS and inherited PSS are transmitted in symbols 5 and 6,
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47/94 respectively. However, in subframes 305-b through 305d, PSS and SSS are transmitted in symbols 5 and 6, respectively, and inherited PSS and inherited SSS are transmitted in symbols 2 and 3, respectively. In some respects, swapping the legacy PSS / SSS and PSS / SSS locations increases the likelihood that the UE 115 will be able to identify the start of the subframe (for example, since the PSS / SSS are transmitted later in the subframe). Additionally, in some respects, the SSS can be the same sequence as the legacy SSS, which reduces the complexity at base station 105-a and UE 115.
[00111] In the illustrative diagram 800, the bandwidth of channel 805 measures a part of available frequencies, and the OFDM symbols from 0 to 13 of each subframe 305-a to 305-d within the bandwidth 805 are labeled in the part allocation of resources. As discussed above, the PSS and SSS can be transported on the R subcarriers 810, centered on the 805 bandwidth. Each of the R subcarriers 810 can be moved by one another in frequency (for example, 15 kHz between each subcarrier). As shown in illustrative diagram 800, to assist in PSS detection, base station 105-a can transmit PSS within the same subframe (for example, within symbols 2 to 7 of subframe 305-b). For example, if R = 63, and the PSS p sequence can be a ZC sequence having a length of 63, the 63 complex numbers of the ZC sequence can be mapped to 63 subcarriers centered on the 805 bandwidth. As described above, the sequence ZC can be selected based on a cell identifier associated with the base station
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105-a (for example, one of the three ZC sequences can be selected). In some aspects, a ZC sequence with a low correlation with a sequence associated with the inherited PSS can be selected. In some respects, the PSS can be combined with an inherited PSS (for example, by the UE 115) in order to perform synchronization.
[00112] As additionally shown, the same R subcarriers 810 can also be used to transport the SSS and PBCH (or the extension PBCH (PBCH Ex)) in subframes 305. As additionally shown, to assist in SSS detection, the base station 105-a can transmit the SSS within the same subframe as that in which the PSS is transmitted (for example, within symbols 8 to 13 of subframe 305-b). In some respects, PSS and SSS can be transmitted in an equal number of consecutive symbols (for example, the transmission of PSS and SSS in two sets of six consecutive symbols is shown in FIG. 8A). In some respects, PSS and SSS can be transmitted on a different number of consecutive symbols in the subframe (for example, PSS can be transmitted on symbols 2 through 6 of the subframe and SSS can be transmitted on symbols 7 through 13 of the subframe , the PSS can be transmitted on symbols 2 to 9 of the subframe and the SS can be transmitted on symbols 10 to 13, and / or, among others).
[00113] The non-labeled parts of the time and frequency resources of subframes 305-aa 305-d can be used to carry other information, such as, for example, legacy DRS, legacy PSS, legacy SSS, MF 1.0 ePSS , MF 1.0 eSSS, the Physical Control Channel
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49/94 inherited downlink (PDCCH), SIB, MF SIB, PDCCH for SIB, and / or, among others.
[00114] In some respects, having all the PSS symbols and the SSS symbols in a single subframe saves the UE 115 storage hardware beneficially (for example, since the PSS and SSS do not need to be stored during the various subframes ). In some respects, the transmission techniques of the illustrative diagrams 700 and 800 reduce the duration of cell acquisition by the UE 115 and provide an improved rate of detection of PSS and SSS from an attempt.
[00115] A PSS detector of UE 115-a can detect a PSS within a subframe 305 to determine the symbol timing of the symbol periods and to determine a cell identifier within a group of cell identifiers of the base station 105. FIG. 9 illustrates an example of a PSS 900 detector that supports synchronization to improve broadband coverage in accordance with various aspects of the present disclosure. The PSS 900 detector may include a symbol generator 905, a timing hypothesis selector 910, a cross correlator 915, an automatic correlator 920, a cost determiner 925 and a symbol timing determiner 930.
[00116] The UE 115-a can receive a signal transmitted by the base station 105-a and provide the received signal to the symbol generator 905. The UE 115-a can include a mixer and a cyclic prefix remover, for example, which processes the signal before entering the 905 symbol generator. The 905 symbol generator can
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50/94 receive a set of timing assumptions τ = [τΐ, τ2,. . . τΜ] from the timing hypothesis picker 910 and the symbol generator 905 can generate a set of symbols from the signal received for each timing hypothesis in the set. A time hypothesis can be a candidate time interval for when a symbol period begins and ends (see FIG. 3). Each timing hypothesis in the set can be shifted from one to another in time, and the UE 115-a can check each timing hypothesis in the set to identify which candidate time interval best aligns with the symbol period limits (see FIG 3).
[00117] The symbol generator 905 can perform processing in the time domain, processing in the frequency domain, or both, on the received signal to generate the symbols from the signal received in each timing hypothesis. In one example, the 905 symbol generator can generate the received signals using a fast Fourier transform (FFT). Each symbol generated can be a complex number observed in each of the R 710/810 subcarriers.
[00118] In a case where the base station 105-a transmits the same sequence PSS in a defined number X (X> 1) of consecutive symbol periods within a single subframe 305, the symbol generator 905 generates vectors of columns of symbols measured for the defined number of consecutive symbol periods. For example, for each frequency index (for example, the part of the spectrum corresponding to a subcarrier) and when X = 6, the symbol generator 905 can divide 6 symbols received with
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51/94 hypotheses of timing τ in 6 column vectors using the following equation:
RW = ko-n, ..., r ₅ ]
[00119] For example, if the sequence PSS has a length of 63 and is sent in 6 consecutive OFDM symbols, the symbol generator 905 processes the received signal to generate a column vector r having 63 symbols in each of the 6 periods of consecutive symbols. The symbol generator 905 outputs to the cross correlator 915 a matrix R that includes the 6 column vectors r for each timing hypothesis in the set.
[00120] Cross correlator 915 performs a cross correlation per symbol within a channel coherence time between the PSS sequence p and the coverage code ^s m for each timing hypothesis to generate cross correlation symbols y using the following equation:
y (O = [y ₀ , y _lt -, y ₅ ] = p ^h · [νο »νΐ '[00121] The sequence PSS p and the coverage code ^s m can be known by the UE 115-a, and the UE 115- a can use the knowledge of the PSS sequence p and the coverage code ^s m trying to identify the limits of the symbol periods The cross correlator 915 issues the cross correlation symbols y to the automatic correlator 920.
[00122] The 920 automatic correlator can perform an automatic symbol-to-symbol correlation that is robust for a frequency shift to
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52/94 coherently combine the y cross-correlation symbols. The frequency shift may be the difference between the frequencies used by the base station 105-a to transmit the subcarriers and the frequencies used by the UE 115-a to demodulate the subcarriers. The automatic correlator 920 can perform automatic correlation in each timing hypothesis using the following equation:
^- ym + ky-m. m
[00123] In this example, k = X - 1. Conventional techniques avoided automatic correlation in scenarios where the SNR is low. The examples described in this document enhance conventional techniques due to the symbol for symbol autocorrelation to capture the frequency shift and coherently combine the symbols to reduce noise. The automatic correlator 920 can issue the automatic correlation values ak for each timing hypothesis to the cost determiner 925.
[00124] Cost determiner 925 can calculate a cost function based on the auto correlation values ak using the following equation:
ρ (τ) = · | aj + w _k a _{fe +} i (T) · a * _k (r) k = l
[00125] The variable wk can be a weighting factor of an automatic correlation with the delay k. Cost determiner 925 can output cost values p for each timing hypothesis to the cost determiner
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53/94 930 symbol timing.
[00126] The symbol timing determiner 930 can determine which timing hypothesis best matches the symbol timing used by base station 105-a. In some examples, the 930 symbol timing determiner can perform PSS detection according to the following equation:
max
IpWI
Ipl threshold T
[00127] can represent the average cost ρ (τ) of the timing assumptions.
[00128] For timing estimation, the UE 115-a can select the timing hypothesis τ that maximizes the proportion. UE 115-a determines that PSS was detected if the maximum proportion value meets the T limit. If it is less than T, UE 115-a declares that PSS was not detected and the corresponding timing hypothesis is not valid . If the ratio is greater than T, the UE 115-a determines that the PSS has been detected and can select the τ timing hypothesis that maximizes the ratio as the symbol timing. The timing hypothesis τ that maximizes the proportion and satisfies the limit T can, therefore, represent the timing hypothesis that best aligns with the period limits of the symbol. In some cases, the UE 115-a can maintain the N best timing assumptions (even all assumptions that satisfy the T limit) and then validate one of the timing assumptions using SSS detection.
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[00129] In some examples, the symbol timing determiner 930 can generate a frequency estimate for each timing hypothesis using the following equation:
fest = —— arg {p (r)} · 15ÃHz 137π
[00130] In some cases, the PSS 900 detector may additionally include a sequence hypothesis selector 935 to select one of three sequences that correspond to three hypotheses associated with the determination of a cell identifier within a group of cell identifiers. In some cases, the PSS 900 detector can determine the cell identifier (for example, 0, 1 or 2) corresponding to the selected sequence. Thus, in some respects, the sequence hypothesis selector 935 facilitates the determination of the cell identifier based on which the physical cell identifier can be determined (for example, in conjunction with the group of cell identifiers associated with the SSS).
[00131] An SSS detector of the UE 115-a can use the best timing hypothesis, or the N best timing hypotheses, to determine the timing of the base station subframe 105-a. FIG. 10 illustrates an example of an SSS 1000 detector supporting synchronization to improve broadband coverage in accordance with various aspects of the present disclosure. To make PSS detection robust, PSS is a unique sequence and therefore cannot carry a group
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55/94 of base station cell identifiers 105-a. The SSS can be used to transport the cell of the cell identifier (for example, 168 distinct cell identifiers per group of cell identifiers).
[00132] In an LBT environment, base station 105 can transmit a reference signal (for example, DRS) in any subframe in a downlink transmission window (DTxW). The reference signal is typically scrambled and the UE determines a scrambling rule to unscramble the reference signal. The UE uses the scrambled reference signal to decode a physical broadcast channel (PBCH) after detecting PSS and SSS. The PBCH can include information that the UE 115 can use for cell acquisition, such as a master information block (MIB) and a system information block (SIB). Conventional systems can use various scrambling rules that increase complexity and prevent the multiplexing of a reference signal (for example, DRS) with other paging messages, UE data and / or, among others.
[00133] In the examples described in this document, the SSS sequence can be encoded with the group of cell identifiers and, optionally, with bits to indicate the displacement of the subframe of a reference signal. Each scrambling rule can correspond to one or more locations in the subframe. The offset of the subframe can indicate a particular location of the subframe and the UE 115-a can select a scrambling rule corresponding to the location of the subframe
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56/94 indicated when moving the subframe, to unscramble the reference signal. Like PSS detection, the examples in this document can achieve a probability detection target of an attempt by transmitting the SSS sequence in a defined X number of consecutive OFDM symbols (see FIG. 8A, symbol periods 8 through 13 of subframe 305 -B). For example, the SSS capacity at -12 dB SINR per subcarrier with X = 6 and CRS overhead factor (132/144) on an AWGN channel (| h | ^A 2 = 1) -> 62 * 6 * (132/144 ) * log2 (1 + 0.0631) = 30.32 bits and in a fading channel (| h | ^Λ 2 = 0.5) ^ · 15.39 bits. A target of 50% detection probability in a trial -J- P (| h | ^A 2> 0.5) = 0.61 can be reached.
[00134] In one example, the SSS 1000 detector may include a symbol generator 1005, a mapper 1010, a decoder SSS 1015 and a timing determiner of subframe 1020. Symbol generator 1005 can operate in a similar manner to symbol generator 905. The symbol generator 1005 can receive the timing and frequency estimate of the symbol corresponding to the best timing hypothesis, or it can receive the timing and frequency estimate of the symbol corresponding to some or all of the timing hypotheses that satisfy the limit T. The following statement describes a single timing hypothesis and may include a 1025 feedback path to try a different timing hypothesis, in case a current timing hypothesis fails to decode properly.
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[00135] The SSS 1000 detector can process the received signal to generate SSS symbol sequences S'1 through S'N as a function of the timing of the input symbol and the estimation of the input frequency. Mapper 1010 can, using table 600 of FIG. 6, determine a cyclic offset and a root for each of the SSS symbol strings S'1 through S'N to determine the index values and can, respectively, determine the BI to BN values using the determined index values.
[00136] The SSS 1015 decoder may attempt to decode the BI to BN values to retrieve the bits of the cell identifier group and the offset bits of the subframe. If unsuccessful and there is at least one additional timing hypothesis, the SSS decoder 1015 can issue a decoding error and send a message via feedback path 1025 instructing the symbol generator 1005 to generate another set of SSS symbol strings S'1 to S'N using a different timing hypothesis. If there are no additional timing assumptions, the SSS 1015 decoder can issue a decoding error and the UE 115 can perform PSS detection a second (or subsequent) time. If capable of generating bits of the cell identifier group and the subframe offset bits, the SSS decoder 1015 can output the bits of the cell identifier group and the subframe offset bits to the subframe timing determiner 1020.
[00137] The time delay determiner
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58/94 subframe 1020 can process the bits of the group of cell identifiers and the offset bits of the subframe to determine a subframe timing for subframes 305 within frame 210. In a case where SSS strings are transmitted in consecutive OFDM symbols (see FIG. 8A, symbol periods 8 through 13 of subframe 305-b), the timing determiner of subframe 1020 can, upon detecting a subframe including the consecutive OFDM symbols, determine the location of subframe 305-b within the frame 210. The subframe timing determiner 1020 may use the determined location of subframe 305-b and the symbol timing to determine the subframe timing. For example, subframe 305 carrying the SSS can be in one of several locations specified in relation to a subframe 305 carrying the PSS, and when the timing determiner of subframe 1020 determines the relative locations, the timing determiner of subframe 1020 can be able to determine limits of frame 210 and the timing of subframe limits within frame 210.
[00138] In a case where SSS strings are transmitted in a consecutive frame symbol (see FIG. 7A, the symbol period 5 and 6 of subframe 305-a and subframe 305-b through 305-d, respectively) timing of subframe 1020 can, when detecting the SSS in the various subframes, determine the location of subframes 305 within frame 210. For example, the timing determiner of subframe 1020 can identify a series of symbols that carry synchronization signals in the subframe, can determine the location of the SSS
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59/94 within the series of symbols, can determine the limits of frame 210 in relation to that location, and can determine the timing of the subframe limits within frame 210 in relation to the limits of frame 210.
[00139] Subframe timing determiner 1020 can also determine which scramble rule to apply to unscramble one or more reference signals. As noted above, each scrambling rule can correspond to one or more subframe locations. The subframe timing determiner 1020 can process the subframe offset bits to determine a particular subframe location within frame 210, and UE 115-a can select a subframe rule corresponding to the subframe location indicated in the subframe offset for unscramble the reference signal. The UE 115-a can apply the scrambling rule to unscramble a reference signal (for example, the cell specific reference signal (CRS), the channel status reference signal (CSI-RS)) within one or more subframes, and use the scrambled reference signal to decode a PBCH (for example, decode MIB, SIB, etc.) to complete the channel acquisition.
[00140] Beneficially, the examples described in this document can provide a PSS and SSS detection technique that improves the probability of detecting an attempt. In addition, the techniques described in this document can encode a group of cell identifiers, shift the subframe to a reference signal, or both, in an SSS sequence that can be
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60/94 used to determine the subframe timing and a scrambling rule for the reference signal.
[00141] FIG. 11 shows a block diagram 1100 of an unwired device 1105 that supports synchronization for the improvement of broadband coverage in accordance with aspects of the present disclosure. Unwired device 1105 can be an example of aspects of user equipment (UE) 115, as described in this document. Unwired device 1105 can include receiver 1110, UE 1115 communications manager and transmitter 1120. Unwired device 1105 can also include a processor. Each of these components can be in communication with each other (for example, via one or more buses).
[00142] Receiver 1110 can receive information such as packages, user data or control information associated with various information channels (for example, control channels, data channels and information related to synchronization for the improvement of coverage of broadband, etc.). The information can be passed on to other components of the device. Receiver 1110 can be an example of aspects of transceiver 1435 described with reference to FIG. 14. The 1110 receiver can use a single antenna or a set of antennas.
[00143] The UE 1115 communications manager can be an example of aspects of the UE 1415 communications manager described with reference to FIG. 14.
[00144] The communications manager of UE 1115 and / or at least some of its various subcomponents can be implemented in hardware, software run by
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61/94 a processor, firmware, or any combination thereof. If implemented in software run by a processor, the functions of the UE 1115 communications manager and / or at least some of its various subcomponents can be performed by a general purpose processor, a digital signal processor (DSP), a circuit application-specific integrated (ASIC), an array of field programmable ports (FPGA) or other programmable logic device, discrete port or transistor logic, discrete hardware components or any combination of them designed to perform the functions described in this disclosure . The communications manager of the UE 1115 and / or at least some of its various subcomponents may be physically located in various positions, including being distributed, so that parts of the functions are implemented in different physical locations by one or more physical devices. In some instances, the UE 1115 communications manager and / or at least some of its various subcomponents may be a separate and distinct component according to various aspects of the present disclosure. In other examples, the UE 1115 communications manager and / or at least some of its various subcomponents may be combined with one or more other hardware components, including, but not limited to, an I / O component, a transceiver, a network server, other computing device, one or more other components described in the present disclosure or a combination thereof according to various aspects of the present disclosure.
[00145] The UE communications manager
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1115 can receive, through a UE, a signal from a base station, generate a set of symbols from the signal based on a timing hypothesis, cross-correlate the set of symbols with a sequence to generate a set of symbols cross-correlation, auto-correlate the cross-correlation symbols to generate a set of autocorrelation values, and synchronize the UE with the base station based on the autocorrelation values. The communications manager of the UE 1115 can also generate, by a UE, a secondary sync signal sequence (SSS) based on a signal transmitted by a base station, to determine, by the UE, a group of cell identifiers of a base station based on the SSS sequence and synchronize the UE with the base station based on the SSS sequence and the group of cell identifiers.
[00146] The 1120 transmitter can transmit signals generated by other components of the device. In some examples, transmitter 1120 may be colocalized with a receiver 1110 in a transceiver module. For example, transmitter 1120 can be an example of aspects of transceiver 1435 described with reference to FIG. 14. The 1120 transmitter can use a single antenna or a set of antennas.
[00147] FIG. 12 shows a block diagram 1200 of a non-wired device 1205 that supports synchronization for the improvement of broadband coverage in accordance with aspects of the present disclosure. Unwired device 1205 can be an example of aspects of an unwired device 1105 or UE 115,
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63/94 as described with reference to FIG. 11. The non-wired device 1205 can include the receiver 1210, the communications manager of the UE 1215 and the transmitter 1220. The non-wired device 1205 can also include a processor. Each of these components can be in communication with each other (for example, via one or more buses).
[00148] Receiver 1210 can receive information such as packets, user data or control information associated with various information channels (for example, control channels, data channels and information related to synchronization for the improvement of broadband coverage, etc.). The information can be passed on to other components of the device. Receiver 1210 can be an example of aspects of transceiver 1435 described with reference to FIG. 14. The 1210 receiver can use a single antenna or a set of antennas.
[00149] The UE 1215 communications manager can be an example of aspects of the UE 1415 communications manager described with reference to FIG. 14.
[00150] The communications manager of UE 1215 may also include signal processor 1225, symbol generator 1230, cross correlator 1235, autocorrelator 1240, symbol timing determiner 1245, cell identifier determiner 1250 and the timing determiner of subframe 1255.
[00151] The signal processor 1225 can receive a signal from a base station.
[00152] The symbol generator 1230 can generate a
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64/94 set of symbols from the signal based on a timing hypothesis, and generate an SSS sequence from the signal based on the synchronization of the UE with the base station. In some cases, the symbol generator 1230 can generate an SSS sequence based on a signal transmitted by a base station, and receive a primary synchronization signal from a base station. In some cases, generating the set of symbols from the signal based on the timing hypothesis includes: dividing, for each frequency index of a set of frequency indices, a defined number of symbols from the signal into a defined number of vectors column. In some cases, the SSS sequence is generated by mapping a set of code words generated by a shortened Reed Solomon encoder using a Galois Field alphabet and a polynominal generator for the first index. In some cases, the set of signal symbols is generated within a time interval corresponding to the duration of one or more subframes of a frame. In some cases, generating the SSS sequence includes: mapping a set of code words generated by an encoder operating using a Galois Field alphabet for a cyclic shift and a root. In some cases, each set of code words is generated by the encoder using a generator polynomial.
[00153] The cross correlator 1235 can cross-correlate the set of symbols with a sequence to generate a set of cross-correlation symbols. In some cases, the sequence is based on a set of synchronization symbols and a coverage code.
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[00154] Autocorrelator 1240 can autocorrelate cross-correlation symbols to generate a set of autocorrelation values.
[00155] The symbol timing determiner 1245 can synchronize the UE with the base station based on the autocorrelation values. In some cases, synchronizing the UE with the base station includes selecting one of the first timing hypothesis or the second timing hypothesis as a base station symbol timing. The symbol timing determiner 1245 establishes a symbol timing based on the primary sync signal, where generating the SSS sequence is based on the symbol timing.
[00156] The cell identifier determiner 1250 can determine a physical cell identity of the base station based on the SSS sequence (for example, based on a group of cell identifiers associated with the SSS) and the PSS sequence (for example, based on in a cell identifier associated with the PSS).
[00157] Subframe timing determiner 1255 can determine subframe timing based on the SSS sequence, synchronize the UE with the base station based on the SSS sequence and physical cell identity, and determine a subframe offset for a reference signal based on the SSS sequence. In some cases, synchronizing the UE with the base station includes determining a base station subframe timing based on the SSS sequence.
[00158] The transmitter 1220 can transmit signals generated by other components of the device. In
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66/94 some examples, the transmitter 1220 may be colocalized with a receiver 1210 in a transceiver module. For example, transmitter 1220 can be an example of aspects of transceiver 1435 described with reference to FIG. 14. The 1220 transmitter can use a single antenna or a set of antennas.
[00159] FIG. 13 presents a 1300 block diagram of a UE 1315 communications manager that supports synchronization for the improvement of broadband coverage in accordance with aspects of the present disclosure. The UE 1315 communications manager can be an example of aspects of an UE 1115 communications manager, an UE 1215 communications manager or an UE 1415 communications manager described with reference to FIGs. 11, 12 and 14. The communications manager of UE 1315 may include signal processor 1320, symbol generator 1325, cross correlator 1330, autocorrelator 1335, symbol timing determiner 1340, cell identifier determiner 1345 , subframe timing determiner 1350, cost determiner 1355, frequency estimator 1360, mapper 1365, displacement determiner 1370, scrambling rule determiner 1375, decoder 1380, and scrambler 1385. Each these modules can communicate directly or indirectly with each other (for example, via one or more buses).
[00160] The 1320 signal processor can receive a signal from a base station.
[00161] The 1325 symbol generator can generate
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67/94 a set of symbols from the signal based on a timing hypothesis and generate an SSS sequence from the signal based on the synchronization of the UE with the base station. In some cases, the symbol generator 1325 may generate an SSS sequence based on a signal transmitted by a base station and receive a primary synchronization signal from a base station. In some cases, generating the set of symbols from the signal based on the timing hypothesis includes dividing for each frequency index of a set of frequency indices, a defined number of symbols from the signal into a defined number of column vectors . In some cases, the SSS sequence is generated by mapping a set of code words generated by a shortened Reed Solomon encoder using a Galois Field alphabet and a polynominal generator for the first index. In some cases, the set of symbols from the signal is generated within a time interval corresponding to a duration of one or more subframes of a frame. In some cases, generating the SSS sequence includes mapping a set of code words generated by an encoder operating using the Galois Field alphabet for a cyclic shift and a root. In some cases, each set of code words is generated by the encoder using a polynominal generator.
[00162] The cross correlator 1330 can cross-correlate the set of symbols with a sequence to generate a set of cross-correlation symbols. In some cases, the sequence is based on a set of synchronization symbols and a coverage code.
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[00163] Autocorrelator 1335 can autocorrelate cross-correlation symbols to generate a set of autocorrelation values.
[00164] The 1340 symbol timing determiner can synchronize the UE with the base station based on the autocorrelation values. In some cases, synchronizing the UE with the base station includes selecting one of the first timing hypothesis or the second timing hypothesis as a base station symbol timing. The symbol timing determiner 1340 can establish a symbol timing based on the primary sync signal, where generating the SSS sequence is based on the symbol timing.
[00165] The cell identifier determiner 1345 can determine a physical cell identity of the base station based on the SSS sequence (for example, based on a group of cell identifiers associated with the SSS) and the PSS sequence (for example, based on in a cell identifier associated with the PSS).
[00166] Subframe timing determiner 1350 can determine subframe timing based on the SSS sequence, synchronize the UE with the base station based on the SSS sequence and physical cell identity, and determine an offset from the subframe to a reference signal based on the SSS sequence. In some cases, synchronizing the UE with the base station includes determining a base station subframe timing based on the SSS sequence.
[00167] Cost determiner 1355 can calculate a cost for the timing hypothesis based on
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69/94 in the autocorrelation values, where synchronizing the UE with the base station is based on the comparison of the calculated cost with a limit. The cost determiner 1355 can calculate a second cost for a second timing hypothesis based on a second set of autocorrelation values, where synchronizing the UE with the base station is additionally based on a comparison of the second cost calculated with the limit.
[00168] The frequency estimator 1360 can determine a frequency estimate for the timing hypothesis based on the calculated cost.
[00169] Mapper 1365 can map the SSS sequence to a first index in a set of indexes and map the SSS sequence to the first index includes mapping a cyclic offset and a root of the SSS sequence to the first index.
[00170] The displacement determiner 1370 can determine a subframe displacement for a reference signal based on the SSS sequence.
[00171] The scrambling rule determiner 1375 can determine a scrambling rule for the reference signal based on displacement of the subframe and unscrambling the reference signal based on the scrambling rule.
[00172] The 1380 decoder can decode a channel based on the reference signal.
[00173] The 1385 scrambler can determine a scrambling rule for the reference signal based on the displacement of the subframe and unscrambling the reference signal based on the scrambling rule.
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[00174] FIG. 14 presents a diagram of a system 1400 including a device 1405 that supports synchronization for the improvement of broadband coverage according to the aspects of the present disclosure. Device 1405 can be an example or include the components of the non-wired device 1105, the non-wired device 1205 or an UE 115 as described above, for example, with reference to FIGs. 11 and 12. Device 1405 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including the UE 1415 communications manager, 1420 processor, 1425 memory, 1430 software , transceiver 1435, antenna 1440 and I / O controller 1445. These components can be in electronic communication via one or more buses (for example, the 1410 bus). Device 1405 can communicate in a non-wired manner with one or more base stations 105.
[00175] The 1420 processor may include an intelligent hardware device, (for example, a general purpose processor, a DSP, a central processing unit (CPU), a microcontroller, an ASIC, an FPGA, a programmable logic device , a discrete port or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the 1420 processor can be configured to operate a memory array using a memory controller. In other cases, a memory controller can be integrated into a 1420 processor. The 1420 processor can be configured to perform
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71/94 computer-readable instructions stored in a memory to perform the various functions (for example, the functions or tasks supporting synchronization to improve broadband coverage).
[00176] Memory 1425 may include random access memory (RAM) and read-only memory (ROM). The 1425 memory can store computer readable and executable software 1430, including instructions that, when executed, cause the processor to perform the various functions described in this document. In some cases, the 1425 memory may contain, among other things, a basic input / output system (BIOS) which can control the basic operation of hardware or software, such as interaction with peripheral components or devices.
[00177] Software 1430 may include code to implement aspects of the present disclosure, including code to support synchronization for the improvement of broadband coverage. The 1430 software can be stored in a non-temporary, computer-readable medium, such as system memory or other memory. In some cases, the 1430 software may not be directly executable by the processor, but it can cause a computer (for example, when compiled and run) to perform the functions described in this document.
[00178] The 1435 transceiver can communicate bidirectionally, via one or more antennas, wired or non-wired links, as described above. For example, transceiver 1435 can represent an unwired transceiver and can communicate bidirectionally with another non-wired transceiver. The 1435 transceiver can also
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72/94 include a modem to modulate the packets and provide the modulated packets to the antennas for transmission and to demodulate packets received from the antennas.
[00179] In some cases, the non-wired device may include a single 1440 antenna. However, in some cases, the device may have more than one 1440 antenna, which may be able to transmit or receive the various non-wired transmissions simultaneously.
[00180] The I / O controller 1445 can manage input and output signals for the 1405 device. The I / O controller 1445 can also manage peripherals not integrated with the 1405 device. In some cases, the I / O controller 1445 can represent a physical connection or port for an external peripheral. In some cases, the 1445 I / O controller may use an operating system such as iOS®, ANDROID®, MS-DOS®, MSWINDOWS®, OS / 2®, UNIX®, LINUX® or another known operating system. In other cases, the 1445 I / O controller can represent or interact with a modem, a numeric keypad, a mouse, a touchscreen or a similar device. In some cases, the 1445 I / O controller can be implemented as part of a processor. In some cases, a user can interact with device 1405 via the I / O controller 1445 or via the hardware components controlled by the I / O controller 1445.
[00181] FIG. 15 shows a block diagram 1500 of an unwired device 1505 that supports synchronization for the improvement of broadband coverage in accordance with aspects of the present disclosure. The 1505 non-wired device can be an example of
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73/94 aspects of a base station 105 as described in this document. The non-wired device 1505 can include the receiver 1510, the base station communications manager 1515, and the transmitter 1520. The non-wired device 1505 can also include a processor. Each of these components can be in communication with each other (for example, via one or more buses).
[00182] Receiver 1510 can receive information such as packets, user data or control information associated with the various information channels (for example, control channels, data channels and information related to synchronization for enhancement) broadband coverage, etc.). The information can be transmitted to other components of the device. Receiver 1510 can be an example of aspects of transceiver 1835 described with reference to FIG. 18. The 1510 receiver can use a single antenna or a set of antennas.
[00183] The communications manager of the base station 1515 can be an example of aspects of the communications manager of the base station 1815 described with reference to FIG. 18
[00184] The communications manager of the base station 1515 and / or at least some of its various subcomponents can be implemented in hardware, software executed by a processor, firmware or any combination thereof. If implemented in software run by a processor, the functions of the communications manager of the base station 1515 and / or at least some of its various subcomponents can be performed by a
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74/94 general purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete port or transistor logic, discrete hardware components or any combination thereof designed to perform the functions described in the present disclosure. The communications manager of the base station 1515 and / or at least some of its various subcomponents may be physically located in various positions, including being distributed, so that the parts of the functions are implemented in different physical locations by one or more physical devices. In some instances, the communications manager of the base station 1515 and / or at least some of its various subcomponents may be a separate and distinct component according to the various aspects of the present disclosure. In other examples, the communications manager of the base station 1515 and / or at least some of its various subcomponents may be combined with one or more other hardware components, including, but not limited to an I / O component, a transceiver, a network server, another computing device, one or more other components described in the present disclosure or a combination thereof according to the various aspects of the present disclosure.
[00185] The communications manager of the base station 1515 can generate, by a shortened Reed Solomon (RS) encoder, an SSS sequence based on a group of cell identifiers from a base station and transmit the SSS sequence.
[00186] The transmitter 1520 can transmit the signals generated by other components of the device. In
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75/94 some examples, the transmitter 1520 can be colocalized with a receiver 1510 in a transceiver module. For example, transmitter 1520 can be an example of aspects of transceiver 1835 described with reference to FIG. 18. The 1520 transmitter can use a single antenna or a set of antennas.
[00187] FIG. 16 shows a block diagram 1600 of a non-wired device 1605 that supports synchronization for improving broadband coverage in accordance with aspects of the present disclosure. Unwired device 1605 can be an example of aspects of an unwired device 1505 or a base station 105 as described with reference to FIG. 15. The non-wired device 1605 can include the receiver 1610, the base station communications manager 1615, and the transmitter 1620. The non-wired device 1605 can also include a processor. Each of these components can be in communication with each other (for example, via one or more buses).
[00188] The 1610 receiver can receive information such as packets, user data or control information associated with the various information channels (for example, control channels, data channels and information related to synchronization for the improvement of broadband coverage, etc.). The information can be transmitted to other components of the device. Receiver 1610 can be an example of aspects of transceiver 1835 described with reference to FIG. 18. The 1610 receiver can use a single antenna or a set of antennas.
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76/94
[00189] The communications manager of the base station 1615 can be an example of aspects of the communications manager of the base station 1815 described with reference to FIG. 18.
[00190] The communications manager of the base station 1615 can also include the sequence manager 1625 and the SSS 1630 processor.
[00191] The sequence manager 1625 can generate, by a shortened Reed Solomon (RS) encoder, an SSS sequence based on a group of cell identifiers from a base station, and generating the SSS sequence is additionally based on a subframe offset of a reference signal within a frame. In some cases, the SSS sequence is a Zadoff-Chu sequence having a defined root and a defined cyclic offset.
[00192] The SSS 1630 processor can transmit the SSS sequence.
[00193] The transmitter 1620 can transmit the signals generated by other components of the device. In some examples, transmitter 1620 may be colocalized with a receiver 1610 on a transceiver module. For example, transmitter 1620 can be an example of aspects of transceiver 1835 described with reference to FIG. 18. The 1620 transmitter can use a single antenna or a set of antennas.
[00194] FIG. 17 presents a 1700 block diagram of a 1715 base station communications manager that supports synchronization for the improvement of broadband coverage in accordance with aspects of the present disclosure. The communications manager of
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77/94 base station 1715 can be an example of aspects of a communications manager of base station 1815 described with reference to FIGs. 15, 16 and 18. The communications manager of the base station 1715 may include the sequence manager 1720, the SSS processor 1725, the primary sync signal encoder (PSS) 1730, the processor PSS 1735 and the mapper 1740. Each these modules can communicate, directly or indirectly with each other (for example, via one or more buses).
[00195] The 1720 sequence manager can generate, via a shortened Reed Solomon (RS) encoder, an SSS sequence based on a group of cell identifiers from a base station, and generating the SSS sequence is additionally based on a subframe offset of a reference signal within a frame. In some cases, the SSS sequence is a Zadoff-Chu sequence having a defined root and a defined cyclic offset.
[00196] The SSS 1725 processor can transmit the SSS sequence.
[00197] The PSS 1730 encoder can encode a PSS sequence with a coverage code to generate an encoded PSS sequence.
[00198] The PSS 1735 processor can transmit the encoded PSS sequence a defined number of times within a subframe of a frame.
[00199] The 1740 mapper can store a table mapping a Galois Field alphabet to a set of Zadoff-Chu sequences, each having a defined root and a defined cyclic offset.
[00200] FIG. 18 presents a diagram of a
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78/94 system 1800 including a device 1805 that supports synchronization for the improvement of broadband coverage according to aspects of the present disclosure. Device 1805 can be an example or include components of base station 105 as described above, for example, with reference to FIG. 1. The 1805 device may include components for bidirectional voice and data communications, including components for transmitting and receiving communications, including the communications manager of the base station 1815, the processor 1820, the memory 1825, the software 1830, the transceiver 1835 , the antenna 1840, the network communications manager 1845, and the communications manager between stations 1850. These components can be in electronic communication via one or more buses (for example, the 1810 bus). The 1805 device can communicate in a non-wired manner with one or more UEs 115.
[00201] The 1820 processor may include an intelligent hardware device (for example, a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete port or component of transistor logic, a discrete hardware component or any combination thereof). In some cases, the 1820 processor can be configured to operate a memory array using a memory controller. In other cases, a memory controller can be integrated with the 1820 processor. The 1820 processor can be configured to execute computer-readable instructions stored in memory to execute the instructions.
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79/94 various functions (for example, functions or tasks supporting synchronization to improve broadband coverage).
[00202] The 1825 memory can include RAM and ROM. The 1825 memory can store the 1830 computer-readable and computer-executable software, including instructions that, when executed, cause the processor to perform the various functions described in this document. In some cases, the 1825 memory may contain, among other things, a BIOS which can control the basic operation of hardware or software, such as interaction with peripheral components or devices.
[00203] The 1830 software may include code to implement aspects of the present disclosure, including code to support synchronization for the improvement of broadband coverage. The 1830 software can be stored on a non-temporary, computer-readable medium, such as system memory or other memory. In some cases, 1830 software may not be directly executable by the processor, but it can cause a computer (for example, when compiled and run) to perform the functions described in this document.
[00204] The 1835 transceiver can communicate bidirectionally, via one or more antennas, wired or non-wired links, as described above. For example, the 1835 transceiver can represent an unwired transceiver and can communicate bidirectionally with another non-wired transceiver. The 1835 transceiver can also include a modem to modulate the packets and provide the modulated packets to the antennas for transmission and
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80/94 demodulate the packets received from the antennas.
[00205] In some cases, the non-wired device may include a single 1840 antenna. However, in some cases, the device may have more than one 1840 antenna, which may be able to transmit or receive several non-wired transmissions simultaneously.
[00206] The network communications manager 1845 can manage communications with the main network (for example, via one or more wired return transport channel links). For example, the network communications manager 1845 can manage the transfer of data communications to client devices, such as one or more UEs 115.
[00207] The communications manager between stations 1850 can manage communications with another base station 105, and can include a controller or programmer to control communications with UEs 115 in cooperation with other base stations 105. For example, the communications manager between 1850 stations can coordinate scheduling for transmissions to UEs 115 for various interference mitigation techniques, such as beam shaping or joint transmission. In some instances, the communications manager between stations 1850 may provide an X2 interface within Long Term Evolution (LTE) / LTE-A non-wired communication network technology to provide communication between base stations 105.
[00208] FIG. 19 presents a flowchart illustrating a 1900 method for synchronizing to improve broadband coverage in accordance with
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81/94 aspects of the present disclosure. The 1900 method operations can be implemented by a UE 115 or its components as described in this document. For example, method 1900 operations can be performed by a UE communications manager, as described with reference to FIGs. 11 through 14. In some examples, a UE 115 may execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the UE 115 can perform aspects of the functions described below using special purpose hardware.
[00209] In block 1905, the UE 115 can receive a PSS and an SSS in the subframe of a frame, where the SSS is received in a symbol of the subframe which is after a symbol of the subframe in which the PSS is received, and after a set of symbols of the subframe in which a set of other synchronization signals is received. The operations of the 1905 block can be performed according to the methods described in this document. In some examples, aspects of the operations of the 1905 block can be performed by a signal processor as described with reference to FIGs. 11 to 14.
[00210] In block 1910, UE 115 can synchronize with base station 105 based, at least in part, on the PSS and SSS received in the subframe. The operations of the 1910 block can be performed according to the methods described in this document. In some examples, aspects of the operations of block 1910 may be performed by a symbol generator as described with
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82/94 reference to FIGS. 11 to 14.
[00211] FIG. 20 presents a flowchart illustrating a 2000 method for synchronization to improve broadband coverage in accordance with aspects of the present disclosure. Method 2000 operations can be implemented by a UE 115 or its components as described in this document. For example, method 2000 operations can be performed by a UE communications manager, as described with reference to FIGs. 11 through 14. In some examples, a UE 115 may execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the UE 115 can perform aspects of the functions described below using special purpose hardware.
[00212] In block 2005, the UE 115 can receive a PSS and an SSS in the subframe of a frame, where the PSS is received in each of the first several consecutive symbols of the subframe and where the SSS is received in each of the several seconds consecutive symbols of the subframe, where the several second consecutive symbols are after the first several consecutive symbols within the subframe. The operations of the 2005 block can be performed according to the methods described in this document. In some examples, aspects of the 2005 block operations can be performed by a signal processor as described with reference to FIGs. 11 to 14.
[00213] In block 2010, UE 115 can synchronize with base station 105 based, at least on
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83/94 part, in the PSS and SSS received in the subframe. The 2010 block operations can be performed according to the methods described in this document. In some examples, aspects of the 2010 block operations can be performed by a symbol generator, as described with reference to FIGs. 11 to 14.
[00214] FIG. 21 presents a flowchart illustrating a 2100 method for synchronizing to improve broadband coverage in accordance with aspects of the present disclosure. Method 2100 operations can be implemented by a base station 105 or its components, as described in this document. For example, method 2100 operations can be performed by a base station communications manager, as described with reference to FIGs. 15 through 18. In some examples, a base station 105 may execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the base station 105 can perform aspects of the functions described below using special purpose hardware.
[00215] In block 2105, base station 105 can generate an SSS based, at least in part, on a group of cell identifiers associated with the base station. Block 2105 operations can be performed according to the methods described in this document. In some examples, aspects of the operations of block 2105 may be performed by a sequence manager as described with reference to FIGs. 15 to 18.
[00216] In block 2110, base station 105 can
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84/94 transmit the SSS and a PSS in a subframe of a frame, where the SSS is transmitted in a symbol of the subframe which is after a symbol of the subframe in which the PSS is transmitted, and after a set of symbols of the subframe in which a set of other synchronization signals is transmitted. Block 2110 operations can be performed according to the methods described in this document. In some examples, aspects of the operations of block 2110 may be performed by an SSS processor as described with reference to FIGs. 15 to 18.
[00217] FIG. 22 presents a flowchart illustrating a 2200 method for synchronization for improving broadband coverage in accordance with aspects of the present disclosure. The 2200 method operations can be implemented by a base station 105 or by its components as described in this document. For example, method 2200 operations can be performed by a base station communications manager, as described with reference to FIGs. 15 through 18. In some examples, a base station 105 may execute a set of codes to control the functional elements of the device to perform the functions described below. Additionally or alternatively, the base station 105 can perform aspects of the functions described below using special purpose hardware.
[00218] In block 2205, base station 105 can generate an SSS based, at least in part, on a group of cell identifiers associated with the base station. Block 2205 operations can be performed according to the methods described in this document. In some examples,
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85/94 aspects of the operations of block 2205 can be performed by a sequence generator, as described with reference to FIGs. 15 to 18.
[00219] In block 2210, base station 105 can transmit the SSS and a PSS in a subframe of a frame, where the PSS is transmitted in each of the first several consecutive symbols of the subframe, and where the SSS is transmitted in each of one of the several consecutive second symbols in the subframe, where the several second consecutive symbols are after the first several consecutive symbols within the subframe. The operations of the 2210 block can be performed according to the methods described in this document. In some examples, aspects of the operations of block 2210 can be performed by an SSS processor as described with reference to FIGs. 15 to 18.
[00220] It should be noted that the methods described above describe possible implementations, and that operations and steps can be rearranged, or otherwise modified, and that other implementations are possible. In addition, the aspects of two or more methods can be combined.
[00221] The techniques described in this document can be used for various non-wired communication systems, such as multiple division code access (CDMA), multiple division time access (TDMA), multiple division frequency access ( FDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA) and other systems. The terms systems and network
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86/94 are often used interchangeably. A code division multiple access system (CDMA) can implement radio technology such as CDMA2000, Universal Land Radio Access (UTRA), etc. CDMA2000 covers the standards, IS-2000, IS-95 and IS-856. IS-2000 versions can usually be referred to as CDMA2000 IX, IX, etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 IxEV-DO, High Speed Packet Data (HRPD), etc. UTRA includes broadband CDMA (WCDMA) and other variations of CDMA. A TDMA system can implement radio technology such as the Global System for Mobile Communications (GSM).
[00222] An OFDMA system can implement radio technology such as the Mobile Ultra Wide Band (UMB), the UTRA Evolved (E-UTRA), the Institute of Electrical and Electronic Engineers (IEEE) 802.11 (Wi-Fi), the IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, NR and GSM are described in documents from an organization called the Third Generation Partnership Project (3GPP). CDMA2000 and UMB are described in documents from an organization called the Third Generation Partnership Project 2 (3GPP2). The techniques described in this document can be used for the radio systems and technologies mentioned above, as well as other radio systems and technologies. While aspects of an LTE system or an NR system can be described for example purposes, the terminology LTE or
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87/94
NR can be used in much of the description, the techniques described in this document are applicable in addition to LTE and NR applications.
[00223] In LTE / LTE-A networks, including the networks described in this document, the term evolved node B (eNB) can generally be used to describe base stations. The non-wired communications system or systems described in this document may include a heterogeneous LTE / LTE-A or NR network in which different types of eNBs provide coverage for various geographic regions. For example, each eNB, next-generation NodeB (gNB), or base station, can provide communication coverage for a macro cell, a small cell, or other cell types. The term cell can be used to describe a base station, a carrier or component carrier associated with a base station, or a coverage area (e.g., sector, etc.) of a carrier or base station, depending on the context.
[00224] Base stations may include or be referred to by those skilled in the art as a base transceiver station, as a base radio station, as an access point, as a radio transceiver, as a NodeB, as an eNodeB (eNB), gNB , as a Home NodeB, as an eNodeB Home, or as any other suitable terminology. The geographic coverage area for a base station can be divided into sectors constituting only a part of the coverage area. The non-wired communications system or systems described in this document may include base stations of different types (for example, macro cell or small cell base stations). The UEs described
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88/94 in this document may be able to communicate with the various types of base stations and network equipment including macro eNBs, small cell eNBs, gNBs, relay base stations, among others. There may be geographic coverage areas overlapping for different technologies.
[00225] A macro cell usually covers a relatively large geographical area (for example, several kilometers in radius) and can allow unrestricted access by UEs with service subscriptions with the network provider. A small cell is a low power base station when compared to a macro cell, which can operate in the same or different (for example, licensed, unlicensed, etc.) frequency bands such as macro cells. Small cells can include pico cells, femto cells and micro cells according to several examples. A peak cell, for example, can cover a small geographical area and can allow unrestricted access by UEs with service subscriptions with the network provider. A femto cell can also cover a small geographic area (for example, a house) and can provide restricted access by UEs having an association with the femto cell (for example, UEs in a closed subscriber group (CSG), UEs for users in home, among others). An eNB for a macro cell can be referred to as an eNB macro. An eNB for a small cell can be referred to as a small cell eNB, an eNB peak, an eNB femto, or an eNB home. An eNB can support one or more (for example, two, three, four, among others) cells (for example, component carriers).
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89/94
[00226] The non-wired communications system or systems described in this document may support synchronous or asynchronous operation. For synchronous operation, base stations can have similar frame timing, and transmissions from different base stations can be approximately time aligned. For asynchronous operation, base stations may have different frame timing, and transmissions from different base stations may not be aligned in time. The techniques described in this document can be used for synchronous or asynchronous operations.
[00227] The downlink streams described in this document can also be called direct link streams while uplink streams can also be called reverse link streams. Each communication link described in this document - including, for example, the non-wired communications system 100 and 200 of FIGs. 1 and 2 - can include one or more carriers, where each carrier can be a signal made up of several subcarriers (for example, waveform signals with different frequencies).
[00228] The description set out in this document, in connection with the attached drawings, describes illustrative configurations and does not represent all examples that can be implemented or that are within the scope of the claims. The illustrative term used in this document means to serve as an example, case, or illustration, and not preferred or advantageous over other examples. The detailed description includes details
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90/94 specific for the purpose of providing an understanding of the techniques described. These techniques, however, can be practiced without these specific details. In some cases, well-known structures and devices are presented in the form of a block diagram in order to avoid obscuring the concepts of the examples described.
[00229] In the attached figures, components or similar aspects may have the same reference label. In addition, several components of the same type can be distinguished by placing a dash after the reference label and a second label that distinguishes between similar components. If only the first reference label is used in the specification, the description is applicable to any of the similar components having the same first reference label independent of the second reference label.
[00230] The information and signs described in this document can be represented using any one of several different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols and chips that can be referenced throughout the above description can be represented by electrical voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or by any combination of them.
[00231] The various blocks and illustrative modules described in connection with the disclosure in this document can be implemented or executed with a general purpose processor, with a DSP, with an ASIC, with an FPGA or
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91/94 with another programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of them designed to perform the functions described in this document. A general purpose processor can be a microprocessor, but alternatively, the processor can be any conventional processor, controller, micro controller, or state machine. A processor can also be implemented as a combination of computing devices (for example, a combination of a DSP with a microprocessor, several microprocessors, one or more microprocessors in conjunction with a DSP core, or any other configuration).
[00232] The functions described in this document can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software run by a processor, functions can be stored or transmitted as one or more instructions or code in a computer-readable medium. Other examples and implementations are within the scope of the disclosure and attached claims. For example, due to the nature of the software, the functions described above can be implemented using software executed by a processor, hardware, firmware, permanent circuits, or combinations of any of these. Features implementing functions can also be physically located in various positions, including being distributed so that parts of functions are implemented in different physical locations. Beyond
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92/94 addition, as used in this document, including in the claims, or as used in a list of items (for example, a list of items prefaced by a phrase such as at least one among or one or more among) indicates an inclusive list so that, for example, a list of at least one of A, B or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used in this document, the phrase based on should not be constructed as a reference to a closed set of conditions. For example, an illustrative step that is described as based on condition A can be based on either condition A or condition B without departing from the scope of the present disclosure. In other words, as used in this document, the phrase based on must be constructed in the same way as the phrase based at least in part on.
[00233] Computer-readable media includes both computer non-temporary storage media and communication media including any means that facilitates the transfer of a computer program from one location to another. A non-temporary storage medium can be any available medium that can be accessed by a general purpose or special purpose computer. By way of example and not by way of limitation, computer-readable non-temporary media may comprise RAM, ROM, electrically erasable programmable read-only memory (EEPROM), compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-temporary means that may
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93/94 be used to transport or store the desired program code medium in the form of instructions or data structures and which can be accessed by a general purpose or special purpose computer, or general purpose or special purpose processor . In addition, any connection is properly called a computer-readable medium. For example, if the software is transmitted from a website, server or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or non-wired technologies such as infrared, radio and microwave, then coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or non-wired technologies such as infrared, radio and microwave are included in the media definition. Magnetic disc and optical disc, as used in this document, include CD, laser optical disc, optical disc, digital versatile optical disc (DVD), flexible optical disc and Blu-ray® optical disc where magnetic discs normally reproduce data magnetically, as a disc optical reproduce data optically with lasers. Combinations of the above are also included within the scope of a computer-readable medium.
[00234] The description in this document is provided to allow those skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art and the generic principles defined in this document can be applied to other variations without departing from the scope of the disclosure. So, disclosure is not limited
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94/94 to the examples and schemes described in this document, but it is to be in accordance with the broader scope consistent with the principles and new aspects revealed in this document.

权利要求:
Claims (30)
[1]
1. Method for non-wired communication, comprising:
receive, by a user device (UE), a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) in the subframe of a frame, where the SSS is received in a symbol of the subframe that is after a symbol the subframe in which the PSS is received and after a set of symbols of the subframe in which a set of other synchronization signals is received; and synchronize, by the UE, with a base station based, at least in part, on the PSS and SSS received in the subframe.
[2]
A method according to claim 1, further comprising:
receive the PSS and SSS in another subframe of the frame, where the SSS is received in a symbol of the other subframe which is before a symbol of the other subframe in which the PSS is received and before a set of symbols of the other subframe in the which set of other synchronization signals is received, where the other subframe is before the subframe, and where the UE is configured to synchronize with the base station based, at least in part, on the PSS or SSS received on the other subframe .
[3]
A method according to claim 2, wherein:
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2/15 within the subframe:
the symbols in which the PSS and SSS are received are in a first particular location, and the set of symbols in which the set of other synchronization signals are received is in a second particular location; and within the other subframe:
the set of symbols in which the set of other synchronization signals is received is in the first particular location, and the symbols in which the PSS and SSS are received are in the second particular location.
[4]
A method according to claim 3, wherein:
within the subframe:
another PSS, included in the set of other synchronization signals, is received in a symbol, in the second particular location, that is, before a symbol in which another SSS, included in the set of other synchronization signals, is received; and within the other subframe:
the other PSS, included in the set of other synchronization signals, is received in a symbol, in the first particular location, which is after a symbol in which the other SSS, included in the set of other synchronization signals, is received.
[5]
A method according to claim 1, further comprising:
receive the PSS and SSS in another subframe of the frame,
Petition 870190112555, of 11/4/2019, p. 101/142
3/15 where the SSS is received in a symbol from the other subframe which is after a symbol from the other subframe in which the PSS is received and after a set of symbols from the other subframe in which the set of other synchronization signals is received, where the other subframe is after the subframe, and where the UE is configured to synchronize with the base station based, at least in part, on the PSS or SSS received in the other subframe.
[6]
6. Method for non-wired communication, comprising:
generating, by a base station, a secondary synchronization signal (SSS) based at least in part on a group of cell identifiers associated with the base station; and transmit, through the base station, the SSS and a primary synchronization signal (PSS) in a subframe of a frame, where the SSS is transmitted in a symbol of the subframe which is after a symbol of the subframe in which the PSS is transmitted and after a set of symbols of the subframe in which a set of other synchronization signals is transmitted.
[7]
A method according to claim 6, further comprising:
transmit the PSS and SSS in another subframe of the frame, where the SSS is transmitted in a symbol of the other subframe that is before a symbol of the other subframe in which the PSS is transmitted and before a set of
Petition 870190112555, of 11/4/2019, p. 102/142
4/15 symbols of the other subframe on which the set of other synchronization signals is transmitted, where the other subframe is before the subframe, and where a user device is configured to synchronize with the base station based, at least in part , PSS or SSS transmitted in the other subframe.
[8]
8. The method of claim 7, wherein:
within the subframe:
the symbols in which the PSS and SSS are transmitted are in a first particular location, and the set of symbols in which the set of other synchronization signals are transmitted is in a second particular location; and within the other subframe:
the set of symbols in which the set of other synchronization signals is transmitted is in the first particular location, and the symbols in which the PSS and SSS are transmitted are in the second particular location.
[9]
9. Method according to claim 8, wherein:
within the subframe:
another PSS, included in the set of other synchronization signals, is transmitted in a symbol, in the second particular location, before a symbol in which another SSS, included in the set of other synchronization signals, is transmitted; and within the other subframe:
Petition 870190112555, of 11/4/2019, p. 103/142
5/15 the other PSS, included in the set of other synchronization signals, is transmitted in a symbol, in the first particular location, which is after a symbol in which the other SSS, included in the set of other synchronization signals, is transmitted.
[10]
A method according to claim 6, further comprising:
transmit the PSS and SSS in another subframe of the frame, where the SSS is transmitted in a symbol of the other subframe which is after a symbol of the other subframe in which the PSS is transmitted and after a set of symbols of the other subframe in which the set of other synchronization signals is transmitted, where the other subframe is after the subframe, and where a user device is configured to synchronize with the base station based, at least in part, on the PSS or SSS transmitted on the other subframe .
[11]
11. Apparatus for non-wired communication, comprising:
a processor;
memory in electronic communication with the processor; and instructions stored in memory and operable, when executed by the processor, to make the device receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) in a frame subframe, in which the SSS is received in a symbol of
Petition 870190112555, of 11/4/2019, p. 104/142
6/15 subframe which is after a symbol of the subframe in which the PSS is received and after a set of symbols of the subframe in which a set of other synchronization signals is received; and synchronize the handset with a base station based, at least in part, on the PSS and the SSS received in the subframe.
[12]
Apparatus according to claim 11, wherein the instructions are additionally executable by the processor to:
receive the PSS and SSS in another subframe of the frame, where the SSS is received in a symbol of the other subframe which is before a symbol of the other subframe in which the PSS is received and before a set of symbols of the other subframe in the which set of other synchronization signals is received, where the other subframe is before the subframe, and where the device is configured to synchronize with the base station based, at least in part, on the PSS or SSS received on the other subframe .
[13]
13. Apparatus according to claim 12, wherein:
within the subframe:
the symbols in which the PSS and SSS are received are in a first particular location, and the set of symbols in which the set of other synchronization signals are received is in a second particular location; and
Petition 870190112555, of 11/4/2019, p. 105/142
7/15 within the other subframe:
the set of symbols in which the set of other synchronization signals is received is in the first particular location, and the symbols in which the PSS and SSS are received are in the second particular location.
[14]
Apparatus according to claim 13, wherein:
within the subframe:
another PSS, included in the set of other synchronization signals, is received in a symbol, in the second particular location, which is before a symbol in which another SSS, included in the set of other synchronization signals, is received; and within the other subframe:
the other PSS, included in the set of other synchronization signals, is received in a symbol, in the first particular location, which is after a symbol in which the other SSS, included in the set of other synchronization signals, is received.
[15]
Apparatus according to claim 11, wherein the instructions are additionally executable by the processor to:
receive the PSS and SSS in another subframe of the frame, where the SSS is received in a symbol of the other subframe that is after a symbol of the other subframe in which the PSS is received and after a set of symbols of the other subframe in which the set of other synchronization signals is received,
Petition 870190112555, of 11/4/2019, p. 106/142
8/15 where the other subframe is after the subframe, and where the device is configured to synchronize with the base station based, at least in part, on the PSS or SSS received on the other subframe.
[16]
16. Apparatus for non-wired communication, comprising:
a processor;
memory in electronic communication with the processor; and instructions stored in memory and operable, when executed by the processor, to cause the device to generate a secondary synchronization signal (SSS) based at least in part on a group of cell identifiers associated with a base station; and transmit the SSS and a primary synchronization signal (PSS) in a subframe of a frame, where the SSS is transmitted in a symbol of the subframe which is after a symbol of the subframe in which the PSS is transmitted and after a set of symbols of the subframe in which a set of other synchronization signals is transmitted.
[17]
Apparatus according to claim 16, wherein the instructions are additionally executable by the processor to:
transmit the PSS and SSS in another subframe of the frame, where the SSS is transmitted in a symbol of the other subframe that is before a symbol of the other subframe in which the PSS is transmitted and before a set of
Petition 870190112555, of 11/4/2019, p. 107/142
9/15 symbols of the other subframe in which the set of other synchronization signals is transmitted, where the other subframe is before the subframe, and where the device is configured to synchronize with a base station based at least in part on the PSS or in the SSS transmitted in the other subframe.
[18]
18. Apparatus according to claim 17, in which:
within the subframe:
the symbols in which the PSS and SSS are transmitted are in a first particular location, and the set of symbols in which the set of other synchronization signals are transmitted is in a second particular location; and within the other subframe:
the set of symbols in which the set of other synchronization signals is transmitted is in the first particular location, and the symbols in which the PSS and SSS are transmitted are in the second particular location.
[19]
19. Apparatus according to claim 18, in which:
within the subframe:
another PSS, included in the set of other synchronization signals, is transmitted in a symbol, in the second particular location, which is before a symbol in which another SSS, included in the set of other synchronization signals, is transmitted; and within the other subframe:
Petition 870190112555, of 11/4/2019, p. 108/142
10/15 the other PSS, included in the set of other synchronization signals, is transmitted in a symbol, in the first particular location, which is after a symbol in which the other SSS, included in the set of other synchronization signals, is transmitted.
[20]
An apparatus according to claim 16, wherein the instructions are additionally executable by the processor to:
transmit the PSS and SSS in another subframe of the frame, where the SSS is transmitted in a symbol of the other subframe which is after a symbol of the other subframe in which the PSS is transmitted and after a set of symbols of the other subframe in which the set of other synchronization signals is transmitted, where the other subframe is after the subframe, and where the device is configured to synchronize with the base station based, at least in part, on the PSS or SSS transmitted on the other subframe.
[21]
21. Computer-readable non-temporary medium storing code for non-wired communication, code comprising instructions executable by a processor to:
receive a primary sync signal (PSS) and a secondary sync signal (SSS) in a frame's subframe, where the SSS is received in a subframe symbol which is after a subframe symbol in which the PSS is received and after a set of symbols in the subframe in which a set of other synchronization signals is
Petition 870190112555, of 11/4/2019, p. 109/142
11/15 received; and synchronizing user equipment with a base station based, at least in part, on the PSS and SSS received in the subframe.
[22]
22. Computer readable non-temporary medium according to claim 21, in which the instructions are additionally executable by the processor to:
receive the PSS and SSS in another subframe of the frame, where the SSS is received in a symbol of the other subframe which is before a symbol of the other subframe in which the PSS is received and before a set of symbols of the other subframe in the which set of other synchronization signals is received, where the other subframe is before the subframe, and where the user equipment is configured to synchronize with the base station based, at least in part, on the PSS or SSS received on the another subframe.
[23]
23. Computer-readable non-temporary medium according to claim 22, in which:
within the subframe:
the symbols in which the PSS and SSS are received are in a first particular location, and the set of symbols in which the set of other synchronization signals are received is in a second particular location; and within the other subframe:
the set of symbols in which the set of other sync signals is received is at the first
Petition 870190112555, of 11/4/2019, p. 110/142
12/15 particular location, and the symbols in which the PSS and SSS are received are in the second particular location.
[24]
24. Computer-readable non-temporary medium according to claim 23, in which:
within the subframe:
another PSS, included in the set of other synchronization signals, is received in a symbol, in the second particular location, which is before a symbol in which another SSS, included in the set of other synchronization signals, is received; and within the other subframe:
the other PSS, included in the set of other synchronization signals, is received in a symbol, in the first particular location, which is after a symbol in which the other SSS, included in the set of other synchronization signals, is received.
[25]
25. Computer-readable non-temporary medium according to claim 21, in which the instructions are additionally executable by the processor to:
receive the PSS and SSS in another subframe of the frame, where the SSS is received in a symbol of the other subframe that is after a symbol of the other subframe in which the PSS is received and after a set of symbols of the other subframe in which the set of other synchronization signals is received, where the other subframe is after the subframe, and where the user equipment is configured to synchronize with the base station based, at least on
Petition 870190112555, of 11/4/2019, p. 111/142
13/15 part, in the PSS or the SSS received in the other subframe.
[26]
26. A computer-readable non-temporary medium storing code, for non-wired communication, code comprising instructions executable by a processor to:
generating a secondary synchronization signal (SSS) based at least in part on a group of cell identifiers associated with a base station; and transmitting the SSS and a primary synchronization signal (PSS) in a subframe of a frame, where the SSS is transmitted in a symbol of the subframe which is after a symbol of the subframe in which the PSS is transmitted and after a set of symbols of the subframe in which a set of other synchronization signals is transmitted.
[27]
27. Computer readable non-temporary medium according to claim 26, in which the instructions are additionally executable by the processor to:
transmit the PSS and SSS in another subframe of the frame, where the SSS is transmitted in a symbol of the other subframe which is before a symbol of the other subframe in which the PSS is transmitted and before a set of symbols of the other subframe in the which set of other synchronization signals is transmitted, where the other subframe is before the subframe, and where a user device is configured to synchronize with the base station based, at least in part, on the PSS or SSS transmitted on the another subframe.
Petition 870190112555, of 11/4/2019, p. 112/142
14/15
[28]
28. Computer readable non-temporary medium according to claim 27, in which:
within the subframe:
the symbols in which the PSS and SSS are transmitted are in a first particular location, and the set of symbols in which the set of other synchronization signals are transmitted is in a second particular location; and within the other subframe:
the set of symbols in which the set of other synchronization signals is transmitted is in the first particular location, and the symbols in which the PSS and SSS are transmitted are in the second particular location.
[29]
29. Computer-readable non-temporary medium according to claim 28, in which:
within the subframe:
another PSS, included in the set of other synchronization signals, is transmitted in a symbol, in the second particular location, which is before a symbol in which another SSS, included in the set of other synchronization signals, is transmitted; and within the other subframe:
the other PSS, included in the set of other synchronization signals, is transmitted in a symbol, in the first particular location, which is after a symbol in which the other SSS, included in the set of other synchronization signals, is transmitted.
[30]
30. Computer-readable non-temporary medium according to claim 26, in which instructions are
Petition 870190112555, of 11/4/2019, p. 113/142
15/15 additionally executable by the processor to:
transmit the PSS and SSS in another subframe of the frame, where the SSS is transmitted in a symbol of the other subframe which is after a symbol of the other subframe in which the PSS is transmitted and after a set of symbols of the other subframe in which the set of other synchronization signals is transmitted, where the other subframe is after the subframe, and where a user device is configured to synchronize with the base station based, at least in part, on the PSS or SSS transmitted on the other subframe .

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同族专利:

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公开号 | 公开日

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TWI698140B|2020-07-01|

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US10484954B2|2019-11-19|

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CN110612757A|2019-12-24|

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SG11201909116QA|2019-11-28|

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US20180332551A1|2018-11-15|

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WO2018208435A1|2018-11-15|

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TW201902273A|2019-01-01|

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EP3622759B1|2021-03-24|

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JP2020520164A|2020-07-02|

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KR20200003192A|2020-01-08|

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CN110612757B|2020-12-01|

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EP3622759A1|2020-03-18|

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JP6825139B2|2021-02-03|

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KR102139252B1|2020-07-29|

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法律状态:
2021-10-19| B350| Update of information on the portal [chapter 15.35 patent gazette]|

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