reference sign design

专利摘要:
The present invention relates to methods and apparatus for generating and communicating reference signals. Some aspects provide a method for communicating reference signals. The method includes selecting a demodulation reference sequence (DMRS) from a plurality of DMRSs for transmission in a synchronization signal block (SSB), based on a half frame in which the SSB is transmitted. The method additionally includes transmitting the DMRS selected in the SSB.
公开号:BR112020000501A2
申请号:R112020000501-0
申请日:2018-07-09
公开日:2020-07-14
发明作者:Navid Abedini；Muhammad Nazmul Islam；Bilal Sadiq；Peter Gaal；Haitong Sun
申请人:Qualcomm Incorporated；
IPC主号:

专利说明:

[0001] [0001] This application claims priority for US Patent Application No. 16 / 028,312, filed on July 5, 2018, which claims the priority and benefit of US Provisional Patent No. 62 / 532,851, filed on July 14, 2017. The content of both Documents is hereby incorporated by reference in its entirety. Introduction
[0002] [0002] Aspects of the present disclosure refer to communication systems and, more particularly, to methods and apparatus for generating and communicating reference signals.
[0003] [0003] Wireless communication systems are widely implemented to provide various telecommunication services, such as telephony, video, data, messaging, transmissions, etc. These wireless communication systems can employ multiple access technologies that have the ability to support communication with multiple users, by sharing available system resources (for example, bandwidth, transmission power, etc.). Examples of such multiple access systems include Long Term Evolution (LTE) systems from the 3rd generation Partnership Project (3GPP), Advanced LTE systems (LTE-A), code division multiple access systems (CDMA), time division multiple access systems (TDMA), frequency division multiple access systems (FDMA), orthogonal frequency division multiple access systems (OFDMA), single carrier frequency division multiple access (SC) systems -FDMA) and multiple access systems by time division synchronous code division (TD-SCDMA), just to name a few.
[0004] [0004] In some examples, a wireless multiple access communication system may include several base stations (BSs), which each have the ability to simultaneously support communication to various communication devices, also known as equipment User (UEs). In an LTE or LTE-A network, a set of one or more base stations can define an eNodeB (eNB). In other examples (for example, in a next generation, a new radio (NR) or 5G network), a wireless multiple access communication system may include multiple distributed units (DUs) (for example, end units (EUs) , endpoints (ENs), radio exchanges (RHs), intelligent radio exchanges (SRHs), transmit transmission points (TRPs), etc.) in communication with several central units (CUs) (for example, central nodes ( CNs), access node controllers (ANCs), etc.), in which a set of one or more distributed units, in communication with a central unit, can define an access node (for example, which can be called a station - base, 5G NB, next generation NodeB (gNB or gNodeB), TRP, etc.). A base station or distributed unit can communicate with a set of UEs on downlink channels (for example, for transmissions from a base station or for a UE) and uplink channels (for example, for transmissions from a UE to a base station or distributed unit).
[0005] [0005] These multiple access technologies have been adopted in several telecommunication standards to provide a common protocol that allows different wireless devices to communicate at a municipal, national, regional and even global level. New Radio (NR) (eg 5G) is an example of an emerging telecommunication standard. NR is a set of enhancements to the LTE mobile standard enacted by 3GPP. It is designed to support better access to the Internet via mobile broadband, improving spectral efficiency, reducing costs, improving services, making use of new spectrum, and with better integration with other open standards with the use of OFDMA with a cyclic prefix (CP) in the downlink (DL) and uplink (UL). For these purposes, NR supports beam formation, multiple input and multiple output antenna technology (MIMO) and carrier aggregation.
[0006] [0006] However, as the demand for access to mobile broadband continues to increase, there is a need for further improvements in NR and LTE technology. Preferably, these improvements should be applicable to other multiple access technologies and to the telecommunication standards that employ these technologies. BRIEF SUMMARY
[0007] [0007] The systems, methods and devices of the revelation each have different aspects, in which no single aspect is exclusively responsible for its desirable attributes. Without limiting the scope of this disclosure, as expressed by the appended claims, some remedies will be discussed shortly below. After considering this discussion and, in particular, after reading the section entitled “Detailed Description”, it will be understood how the features of this description provide advantages that include improved communications between access points and stations on a wireless network.
[0008] [0008] Certain aspects provide a method for communicating reference signals. The method includes selecting a demodulation reference sequence (DMRS) from a plurality of DMRSs for transmission in a synchronization signal block (SSB) based on a half frame in which the SSB is transmitted. The method additionally includes transmitting the DMRS selected in the SSB.
[0009] [0009] Certain aspects provide a wireless device comprising a memory and a processor. The processor is configured to select a demodulation reference sequence (DMRS) from a plurality of DMRSs for transmission in a synchronization signal block (SSB) based on a half frame in which the SSB is transmitted. The processor is additionally configured to transmit the selected DMRS on the SSB.
[0010] [0010] Certain aspects provide a wireless device. The wireless device includes means for selecting a demodulation reference sequence (DMRS) from a plurality of DMRSs for transmission in a synchronization signal block (SSB) based on a half frame in which the SSB is transmitted. The wireless device additionally includes a means to transmit the selected DMRS on the SSB.
[0011] [0011] Certain aspects provide a non-transitory, computer-readable storage medium that stores instructions that, when executed by a wireless device, cause the wireless device to perform a method for communicating reference signals. The method includes selecting a demodulation reference sequence (DMRS) from a plurality of DMRSs for transmission in a synchronization signal block (SSB) based on a half frame in which the SSB is transmitted. The method additionally includes transmitting the DMRS selected in the SSB.
[0012] [0012] Aspects include, in general, methods, apparatus, systems, computer-readable media and processing systems, as substantially described in this document with reference to the accompanying drawings and as illustrated by them.
[0013] [0013] For the realization of the foregoing and related purposes, the one or more aspects comprise the resources described in a complete manner hereinafter and highlighted in a particular way in the claims. The following description and the accompanying drawings set out, in detail, certain illustrative features of the one or more aspects. These resources are indicative, however, of only a few of the various ways in which the principles of various aspects can be employed. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] [0014] In order that the resources of the present disclosure mentioned above can be understood in detail, a more particular description, briefly summarized above, can be provided by way of reference to aspects, some of which are illustrated in the drawings. It should be noted, however, that the attached drawings illustrate only certain aspects typical of this disclosure and, therefore,
[0015] [0015] Figure 1 is a block diagram that illustrates, conceptually, an exemplary telecommunications system, in accordance with certain aspects of the present disclosure.
[0016] [0016] Figure 2 is a block diagram that illustrates an exemplary logical architecture of a distributed radio access network (RAN), in accordance with certain aspects of the present disclosure.
[0017] [0017] Figure 3 is a diagram that illustrates an exemplary physical architecture of a distributed RAN, in accordance with certain aspects of the present disclosure.
[0018] [0018] Figure 4 is a block diagram that illustrates, conceptually, a design of an exemplary base station (BS) and user equipment (UE), in accordance with certain aspects of the present disclosure.
[0019] [0019] Figure 5 is a diagram showing examples for deploying a communication protocol stack, in accordance with certain aspects of this description.
[0020] [0020] Figure 6 illustrates an example of a frame format for a new radio (NR) system, in accordance with certain aspects of the present description.
[0021] [0021] Figure 7 illustrates an example of a synchronization signal block (SSB), in accordance with certain aspects.
[0022] [0022] Figure 8 illustrates an example of the transmission delay of SSBs, in accordance with certain aspects.
[0023] [0023] Figure 9 illustrates exemplary operations for wireless communications, for example, to generate and communicate reference signals, in accordance with certain aspects.
[0024] [0024] Figure 10 illustrates exemplary operations for wireless communications, for example, for receiving reference signals and determining timing information based on the reference signals, in accordance with certain aspects of the present description.
[0025] [0025] Figure 11 illustrates a communications device that can include various components configured to perform operations for the techniques disclosed in this document, in accordance with aspects of this description.
[0026] [0026] Figure 12 illustrates a communications device that can include various components configured to perform operations for the techniques disclosed in this document, in accordance with aspects of this description.
[0027] [0027] Figure 13 illustrates exemplary operations for wireless communications, for example, to generate and communicate reference signals, in accordance with certain aspects.
[0028] [0028] Figure 14 illustrates a communications device that can include various components configured to perform operations for the techniques disclosed in this document, in accordance with aspects of the present disclosure.
[0029] [0029] In order to facilitate understanding, identical numerical references were used, when possible, to designate identical elements that are common to the figures. It is contemplated that elements described in one aspect can be advantageously used in other aspects without specific citation. DETAILED DESCRIPTION
[0030] [0030] Aspects of the present disclosure refer to the transport of timing information related to a cell to an UE. For example, a base station can generate and transmit reference signals (for example, a primary sync signal (PSS), a secondary sync signal (SSS) and / or a demodulation reference signal (DMRS)) for each cell supported by the base station. Reference signals can be used by UEs for cell detection and acquisition. The base station can also send a Physical Broadcast Channel (PBCH). The PBCH can carry certain system information. DMRS can be used for PBCH channel estimation and demodulation. In certain respects, the transmission of reference signals is used to carry timing information from the cell to the UE. The UE can use the timing information for synchronization and timing reference to communicate in the cell. Certain aspects in this document refer to the communication of information, such as timing information, to the UE based on the design of reference sequences transmitted in the cell.
[0031] [0031] The following description provides examples, and is not limiting the scope, applicability or examples set out in the claims. Changes can be made to the function and arrangement of elements discussed without departing from the scope of the disclosure. Various examples may omit, replace, or add various procedures or components, as appropriate. For example, the methods described can be performed in a different order than described, and several steps can be added, omitted or combined. In addition, the features described in relation to some examples can be combined into some other examples. For example, an appliance can be implanted or a method can be put into practice using any number of aspects set out in this document. In addition, the scope of the disclosure is intended to cover such an apparatus or method that is put into practice with the use of another structure, functionality or structure and functionality in an additional or alternative way to the various aspects of the disclosure set out in this document. It should be understood that any aspect of the disclosure disclosed in this document may be incorporated by one or more elements of a claim. The word "exemplary" is used in this document to mean "that serves as an example, assumption or illustration". Any aspect described in this document as “exemplary” should not necessarily be interpreted as preferential or advantageous in relation to other aspects.
[0032] [0032] The techniques described in this document can be used for various wireless communication technologies, such as LTE, CDMA, TDMA, FDMA, OFDMA, SC-FDMA and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network can deploy radio technology, such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes Broadband CDMA (WCDMA) and other CDMA variants. cdma2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA network can deploy radio technology, such as the Global System for Mobile Communications (GSM). An OFDMA network can deploy radio technology, such as NR (for example, 5G RA), Evolved UTRA (E-UTRA), Ultra-Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDMA, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunication System (UMTS).
[0033] [0033] Novo Rádio (NR) is an emerging wireless communications technology under development in conjunction with the 5G Technology Forum (5GTF). Long Term Evolution (LTE) of 3GPP and LTE-Advanced (LTE-A) are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization called “3rd Generation Partnership Project” (3GPP). cdma2000 and UMB are described in documents from an organization called “3rd Generation Partnership Project 2 (3GPP2). The techniques described in this document can be used for the wireless networks and radio technologies mentioned above, as well as for other wireless networks and radio technologies. For the sake of clarity, although aspects may be described in this document using terminology commonly associated with 3G and / or 4G wireless technologies, aspects of the present disclosure can be applied to other generation-based communication systems, such as 5G and later, including NR technologies.
[0034] [0034] New radio access (NR) (eg 5G technology) can support various wireless communication services, such as enhanced mobile broadband (eMBB) that targets wide bandwidth (eg 80 MHz or beyond) , millimeter wave (mmW) targeting high carrier frequency (for example, 25 GHz or beyond), mass machine MTC (mMTC) type communications targeting compatible non-regressive MTC techniques and / or mission critical targeting ultra low-reliability communications latency (URLLC). These services may include latency and reliability requirements. These services can also have different transmission time intervals (TTI) to satisfy the respective quality of service (QoS) requirements. In addition, these services can coexist in the same subframe. Exemplary Wireless Communications System
[0035] [0035] Figure 1 illustrates an exemplary wireless communication network 100 in which aspects of the present disclosure can be realized. For example, wireless communication network 100 can be a New Radio (NR) or 5G network. For example, BSs of network 100 can transmit reference signals to UEs of network 100 to communicate information, such as timing information, to UEs based on the design of reference sequences transmitted in a cell by the BS.
[0036] [0036] As shown in Figure 1, wireless network 100 can include several base stations (BSs) 110 and other network entities. A BS can be a station that communicates with user equipment (UEs). Each BS 110 can provide coverage of communication for a particular geographic area. In 3GPP, the term “cell” can refer to a coverage area of a Node B (NB) and / or Node B subsystem that serves that coverage area, depending on the context in which the term is used. In NR systems, the term “cell” and next generation NodeB (gNB), new radio base station (NR BS), 5G NB, access point (AP) or transmission and reception point (TRP) can be interchangeable. In some instances, a cell may not necessarily be stationary, and the cell's geographic area may move according to the location of a mobile BS. In some examples, base stations can be interconnected to each other and / or to one or more other base stations or network nodes (not shown) on the wireless communication network 100 via various types of backhaul interfaces, such as such as a direct physical connection, a wireless connection, a virtual network or the like using any suitable transport network.
[0037] [0037] In general, any number of wireless networks can be implemented in a given geographic area. Each wireless network can support a particular radio access technology (RAT) and can operate on one or more frequencies. A RAT can also be called a radio technology, an air interface, etc. A frequency can also be called a carrier, a subcarrier, a frequency channel, a tone, a subband, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks from different RATs. In some cases, NR or 5G RAT networks can be implemented.
[0038] [0038] A base station (BS) can provide communication coverage for a macrocell, a picocell, a femtocell and / or other types of cells. A macrocell can cover a relatively large geographical area (for example, a radius of several kilometers) and can allow unrestricted access by UEs with a service subscription. A picocell can cover a relatively small geographical area and can allow unrestricted access by UEs with a service subscription. A femtocell can cover a relatively small geographical area (for example, a residence) and can allow restricted access by UEs that have an association with the femtocell (for example, UEs in a Closed Subscriber Group (CSG), UEs for users in the residence , etc.). A BS for a macrocell can be called a BS macro. A BS for a picocell can be called a BS peak. A BS for a femtocell can be called a BS femto or a domestic BS. In the example shown in Figure 1, BSs 110a, 110b and 110c can be macro BSs for macrocells 102a 102b and 102c, respectively. The BS 110x can be a BS peak for a 102x picocell. BSs 110y and 110z can be femto BSs for femtocells 102y and 102z, respectively. A BS can support one or multiple (for example, three) cells.
[0039] [0039] The wireless communication network 100 may also include relay stations. A relay station is a station that receives a transmission of data and / or other information from an upstream station (for example, a BS or UE) and sends a transmission of the data and / or other information to a station at downstream (for example, a UE or a BS). A relay station can also be a UE that relays transmissions to other UEs. In the example shown in Figure 1, a relay station 110r can communicate with BS 110a and UE 120r in order to facilitate communication between BS 110a and UE 120r. A relay station can also be called a relay BS, a relay, etc.
[0040] [0040] Wireless network 100 can be a heterogeneous network that includes BSs of different types, for example, macro BS, BS peak, BS femto, retransmissions, etc. These different types of BSs can have different levels of transmission power, different areas of coverage and different impact on interference in the wireless network 100. For example, macro BS can have a high level of transmission power (for example, 20 Watts) while BS peak, BS femto and retransmissions may have a lower transmit power level (for example, 1 Watt).
[0041] [0041] Wireless communication network 100 can support synchronous or asynchronous operation. For synchronous operation, BSs can have similar frame timing, and transmissions from different BSs can be approximately time aligned. For asynchronous operation, BSs may have different frame timing, and transmissions from different BSs may not be time aligned. The techniques described in this document can be used for both synchronous and asynchronous operation.
[0042] [0042] A network controller 130 can couple with a set of BSs and provide coordination and control for those BSs. The network controller 130 can communicate with the BSs 110 through a backhaul. BSs 110 can also communicate with each other (for example, directly or indirectly) via wired or wireless backhaul.
[0043] [0043] UEs 120 (e.g. 120x, 120y, etc.) can be dispersed over wireless network 100, and each UE can be stationary or mobile. A UE can also be called a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Client Premises Equipment (CPE), a cell phone, a smartphone, a personal digital assistant (PDA) , a wireless modem, a wireless communication device, a portable device, a laptop computer, a cordless phone, a local wireless circuit station (WLL), a tablet computer, a camera, a device games, a netbook, a smart book, an ultrabook, a device, a medical device or medical equipment, a biometric sensor / device, a wearable device close to the body, such as a smart watch, smart clothes, smart glasses, a bracelet smart, smart jewelry (for example, a smart ring, smart bracelet, etc.), an entertainment device (for example, a music device, a video device, a satellite radio, etc.), a component or vehicle sensor, a smart meter / sensor, industrially manufactured equipment, a global positioning system device, or any other suitable device that is configured to communicate via wired or wireless media. Some UEs can be considered machine-type communication devices (MTC) or evolved MTC devices (eMTC). MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a BS, another device (for example, remote device) or some other entity. A wireless node can provide, for example, connectivity to or to a network (for example, a wide area network, such as the Internet or a cellular network) through a wired or wireless communication link. Some UEs can be considered Internet of Things (IoT) devices, which can be narrowband IoT devices (NB-IoT).
[0044] [0044] Certain wireless networks (for example, LTE) use orthogonal frequency division multiplexing (OFDM) in the downlink and single carrier frequency division multiplexing (SC-FDM) in the uplink. OFDM and SC-FDM segment system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, bins, etc. Each subcarrier can be modulated with data. In general, modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can be dependent on the system bandwidth. For example, the spacing of the subcarriers can be 15 kHz and the minimum resource allocation (called a "resource block" (RB) can be 12 subcarriers (or 180 kHz). Consequently, the Fast Fourier Transform (FFT) size ) nominal can be 128, 256, 512, 1,024 or 2,048 for system bandwidth of 1.25, 2.5, 5, 10 or 20 megahertz (MHz), respectively. System bandwidth can also For example, a subband can span 1.08 MHz (ie 6 resource blocks), and there can be 1, 2, 4, 8, or 16 subbands for bandwidth of 1.25, 2.5, 5, 10 or 20 MHz system, respectively.
[0045] [0045] While the aspects of the examples described in this document may be associated with LTE technologies, aspects of the present disclosure may apply to other wireless communications systems, such as NR. NR can use OFDM with a CP in the uplink and downlink and include support for semiduplex operation using TDD. Beam formation can be supported and beam direction can be dynamically configured. MIMO transmissions with pre-coding can also be supported. The MIMO configurations on the DL can support up to 8 transmission antennas with multi-layered DL transmissions up to 8 streams and up to 2 streams per UE. Multilayer transmissions with up to 2 streams per EU can be supported. Multiple cell aggregation can be supported with up to 8 server cells.
[0046] [0046] In some examples, access to the air interface can be scheduled, in which a scheduling entity (for example, a base station) allocates resources for communication between some or all devices and equipment within its service area or cell . The scheduling entity may be responsible for scheduling, assigning, reconfiguring and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities use resources allocated by the scheduling entity. Base stations are not the only entities that can function as a scheduling entity. In some instances, a UE can function as a scheduling entity and can schedule resources for one or more subordinate entities (for example, one or more other UEs), and the other UEs can use the resources scheduled by the UE for wireless communication. In some examples, a UE may function as a scheduling entity on a point-to-point (P2P) network and / or on a mesh network. In an example of a mesh network, UEs can communicate directly with each other in addition to communicating with a scheduling entity.
[0047] [0047] In Figure 1, a continuous line with double arrows indicates desired transmissions between a UE and a serving BS, which is a BS designated to serve the UE on the downlink and / or uplink. A finely dashed line with double arrows indicates interference transmissions between a UE and a BS.
[0048] [0048] Figure 2 illustrates an exemplary logical architecture of a distributed Radio Access Network (RAN) 200, which can be deployed in wireless communication network 100 illustrated in Figure 1. A 5G 206 access node can include a controller access node (ANC) 202. ANC 202 can be a central unit (CU) of distributed RAN 200. The backhaul interface for the Next Generation Core Network (NG-CN) 204 can end at ANC 202. The backhaul interface for neighboring next generation access nodes (NG-ANs) 210 may end at ANC 202. ANC 202 may include one or more transmit and receive points (TRPs) 208 (for example, cells, BSs, gNBs, etc.) . [0049] TRPs 208 can be a distributed unit (DU). TRPs 208 can be connected to a single ANC (for example, ANC 202) or more than one ANC (not shown). For example, for RAN sharing, radio as a service (RaaS), and service-specific AND implementations, TRPs 208 can be connected to more than one ANC. The TRPs 208 may each include one or more antenna ports. The TRPs 208 can be configured to serve individually (for example, dynamic selection) or together (for example, joint transmission) traffic to a UE.
[0050] [0050] The logical architecture of distributed RAN 200 can support fronthauling solutions through different types of implementation. For example, the logical architecture can be based on transmission network capabilities (for example, bandwidth, latency and / or variation).
[0051] [0051] The logical architecture of distributed RAN 200 can share resources and / or components with LTE. For example, next generation access node (NG-AN) 210 can support dual connectivity with NR and can share a common fronthaul for LTE and NR.
[0052] [0052] The logical architecture of distributed RAN 200 may allow cooperation between TRPs 208, for example, within a TRP and / or through TRPs through ANC 202. An interface between TRPs may not be used.
[0053] [0053] The logical functions can be distributed,
[0054] [0054] Figure 3 illustrates an exemplary physical architecture of a Radio Access Network (RAN) distributed 300, according to the aspects of the present disclosure. A centralized main network unit (C-CU) 302 can host main network functions. The C-CU 302 can be centrally implemented. The C-CU 302 functionality can be downloaded (for example, for advanced wireless services (AWS)), in an effort to support peak capacity.
[0055] [0055] A centralized RAN unit (C-RU) 304 can host one or more ANC functions. Optionally, the C-RU 304 can host core network functions locally. The C-RU 304 can have a distributed implementation. The C-RU 304 can be close to the network end.
[0056] [0056] A DU 306 can host one or more TRPs (End Node (EN), End Unit (EU), Radio Station (RH), Intelligent Radio Station (SRH) or similar). DU can be located at network ends with radio frequency (RF) functionality.
[0057] [0057] Figure 4 illustrates exemplary components of BS 110 and UE 120 (as depicted in Figure 1), which can be used to implement aspects of the present disclosure. For example, antennas 452, processors 466, 458, 464 and / or controller / processor 480 of UE 120 and / or antennas 434, processors 420, 460, 438 and / or controller / processor 440 of BS 110 can be used to perform the various techniques and methods described in this document.
[0058] [0058] In BS 110, a transmission processor 420 can receive data from a data source 412 and control information from a controller / processor 440. The control information can be for the physical broadcast channel (PBCH), physical channel control format indicator (PCFICH), hybrid ARQ indicator physical channel (PHICH), physical downlink control channel (PDCCH), group common PDCCH (GC PDCCH), etc. The data can be for the shared physical downlink channel (PDSCH), etc. Processor 420 can process (e.g., encode and map symbol) control data and information to obtain data symbols and control symbols, respectively. Processor 420 can also generate reference symbols, for example, for the primary sync signal (PSS), secondary sync signal (SSS) and cell specific reference signal (CRS). A transmission (TX) 430 multiple input and multiple output (MIMO) processor can perform spatial processing (for example, pre-coding) on data symbols, control symbols and / or reference symbols, where applicable, and can provide output symbol streams to modulators (MODs) 432a at
[0059] [0059] At UE 120, antennas 452a to 452r can receive downlink signals from base station 110 and can provide received signals to demodulators (DEMODs) on transceivers 454a to 454r, respectively. Each demodulator 454 can condition (for example, filter, amplify, downwardly convert and digitize) a respective received signal to obtain input samples. Each demodulator can additionally process the input samples (for example, for OFDM, etc.) to obtain received symbols. A MIMO 456 detector can obtain symbols received from all demodulators 454a through 454r, perform MIMO detection on received symbols, when applicable, and provide detected symbols. A receiving processor 458 can process (e.g., demodulate, deinterleave and decode) the detected symbols, provide decoded data for UE 120 to a data collector 460 and provide decoded control information to a controller / processor 480.
[0060] [0060] In the uplink, in the UE 120, a transmission processor 464 can receive and process data (for example, for the shared physical channel of uplink
[0061] [0061] Controllers / processors 440 and 480 can direct the operation on base station 110 and UE 120, respectively. The 440 processor and / or other processors and modules in BS 110 can perform or direct the execution of processes for the techniques described in this document. Memories 442 and 482 can store data and program codes for BS 110 and UE 120, respectively. A 444 scheduler can program UEs for data transmission in the downlink and / or uplink.
[0062] [0062] Figure 5 illustrates a diagram 500 showing examples for deploying a communications protocol stack, according to aspects of the present disclosure. The illustrated communications protocol stacks can be deployed by devices that operate on a wireless communication system, such as a 5G system (for example, a system that supports uplink-based mobility). Diagram 500 illustrates a communications protocol stack that includes a Radio Resource Control (RRC) layer 510, a Packet Data Convergence Protocol (PDCP) layer 515, a Radio Link Control (RLC) layer ) 520, a Media Access Control (MAC) layer 525 and a physical (PHY) layer 530. In several examples, layers of a protocol stack can be deployed as separate software modules, portions of a processor or ASIC , portions of non-juxtaposed devices connected by a communications link or various combinations thereof. Juxtaposed and non-juxtaposed deployments can be used, for example, in a protocol stack for a network access device (for example, ANs, CUs and / or DUs) or a UE.
[0063] [0063] A first option 505-a shows a split deployment of a protocol stack, where the deployment of the protocol stack is split between a centralized network access device (for example, an ANC 202 in Figure 2) and device distributed network access (for example, DU 208 in Figure 2). In the first option 505-a, a layer of RRC 510 and a layer of PDCP 515 can be implanted by the central unit, and a layer of RLC 520, a layer of MAC 525 and a layer PHY 530 can be implanted by the DU. In several instances, CU and DU can be juxtaposed or non-juxtaposed. The first option 505-a can be useful in a macrocell, microcell or picocell implementation.
[0064] [0064] A second option 505-b shows a unified deployment of a protocol stack, in which the protocol stack is deployed on a single network access device. In the second option, RRC 510 layer, PDCP 515 layer, RLC 520 layer, MAC 525 layer and PHY 530 layer can be implanted, each by the AN. The second option 505-b can be useful, for example, in a femtocell implementation.
[0065] [0065] Regardless of whether a network access device deploys part or all of a protocol stack, a UE can deploy an entire protocol stack, as shown in 505-c (for example, the RRC 510 layer, the PDCP layer 515, the RLC layer 520, the MAC layer 525 and the PHY layer 530).
[0066] [0066] In LTE, the basic transmission time interval (TTI) or packet duration is the 1 ms subframe. In NR, a subframe is still 1 ms, but the basic TTI is called a slot. A subframe contains a variable number of slots (for example, 1, 2, 4, 8, 16 slots) depending on the subcarrier spacing. The NR RB has 12 consecutive frequency subcarriers. NR can support a 15 KHz subcarrier spacing and another subcarrier spacing can be defined in relation to the base subcarrier spacing, for example, 30 kHz, 60 kHz, 120 kHz, 240 kHz, etc. The symbol and slot lengths adjust to the subcarrier spacing. The CP length also depends on the subcarrier spacing.
[0067] [0067] Figure 6 is a diagram showing an example of a 600 frame format for NR. The transmission timeline for each of the downlink and uplink can be segmented into radio frame units. Each radio frame can have a predetermined duration (for example, 10 ms) and can be segmented into 10 subframes, each 1 ms, with indexes from 0 to 9. Each subframe can include a variable number of slots depending on the spacing of subcarrier. Each slot can include a variable number of symbol periods (for example, 7 or 14 symbols) depending on the subcarrier spacing. Symbol periods in each slot can be assigned indexes. A minislot, which can be called a subslot structure, refers to a transmission time interval that is shorter than a slot (for example, 2, 3 or 4 symbols).
[0068] [0068] Each symbol, in a slot, can indicate a link direction (for example, DL, UL or flexible) for data transmission and the link direction for each subframe can be switched dynamically. Link directions can be based on the slot format. Each slot can include DL / UL data as well as DL / UL control information.
[0069] [0069] In NR, a synchronization signal block (SS) is transmitted. The SS mouthpiece includes a PSS, an SSS and a two-symbol PBCH. The SS block can be transmitted in a fixed slot location, such as symbols 0 to 3, as shown in Figure 6. The PSS and SSS can be used by UEs for cell search and acquisition. PSS can provide half frame timing, SS can provide CP length and frame timing. PSS and SSS can provide cell identity. The PBCH carries some basic system information, such as downlink system bandwidth, timing information within the radio frame, SS flashing periodicity, system frame number, etc. SS blocks can be arranged in SS blinks to support beam scanning. Additional system information, such as minimum remaining system information (RMSI), system information blocks (SIBs), other system information (OSI) can be transmitted over a shared physical downlink channel (PDSCH) in certain subframes.
[0070] [0070] In some circumstances, two or more subordinate entities (for example, UEs) can communicate with each other using sidelink signals. Real-world applications of such sidelink communications may include public security, proximity services, EU-to-network relay, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical mesh and / or several other suitable applications. In general, a sidelink signal can refer to a signal communicated from a subordinate entity (for example, UE1) to another subordinate entity (for example, UE2) without relaying that communication through the scheduling entity (for example , UE or BS), although the scheduling entity can be used for scheduling and / or control purposes. In some instances, sidelink signals can be communicated using a licensed spectrum (unlike wireless local area networks, which typically use an unlicensed spectrum).
[0071] [0071] An UE can operate in various radio resource configurations, including a configuration associated with the transmission of pilots using a dedicated set of resources (eg, a dedicated radio resource control state (RRC), etc. .) or a configuration associated with the transmission of pilots using a common set of resources (for example, a common RRC state, etc.). When operating in the dedicated state of RRC, the UE can select a dedicated set of resources to transmit a pilot signal to a network. When operating in the common state of RRC, the UE can select a common set of resources to transmit a pilot signal to the network. In any case, a pilot signal transmitted by the UE can be received by one or more network access devices, such as an AN or DU or portions thereof. Each receiving network access device can be configured to receive and measure pilot signals transmitted in the common set of resources, and also receive and measure pilot signals transmitted in dedicated sets of resources allocated to the UEs for which the network access device is a member of a network access device monitoring suite for the UE. One or more of the receiving network access devices, or a CU to which receiving network access device (s) transmit the measurements of the pilot signals, can use the measurements to identify server cells for the UEs,
[0072] [0072] Aspects of the present disclosure refer to the transport of timing information related to a cell to a UE. For example, a BS can generate and transmit reference signals (for example, a PSS, an SSS and / or a DMRS) for each cell supported by the BS.
[0073] [0073] In certain aspects, a BS (for example, BS 110 described in relation to Figure 1) is configured to transmit reference signals in blocks, which can be called signal synchronization blocks (SSBs). Figure 7 illustrates an example of an SSB 700, in accordance with certain aspects. The geometric axis X, in the illustration in Figure 7, indicates time (for example, symbols), and the geometric axis Y indicates frequency (for example, tones). As shown, the SSB 700 includes a PSS 702, an SSS 704, a PBCH 706 and a PBCH 707 multiplexed in the time domain and allocated to certain frequency bands. In certain respects, PSS 702 and SSS 704 are allocated to the same frequency range. Additionally, in certain aspects, PBCH 706 and PBCH 707 are allocated to the same frequency range. In certain respects, PSS 702 and SSS 704 are allocated to a portion (for example, half) of the frequency range of PBCH 706 and PBCH 707. Although shown in a particular order on SSB 700 and of duration and frequency allocations particulars, it should be noted that the order,
[0074] [0074] Although not shown, an SSB can include more or less signals, channels, etc. than shown. For example, an SSB may additionally include a third synchronization signal (TSS) or a beam reference signal.
[0075] [0075] In certain respects, multiple SSBs (for example, SSB 700) can be assigned to a set of resources to transmit multiple SSBs (such a set of resources to transmit multiple SSBs can be referred to in this document as a set of flashes of SS). Multiple SSBs can be assigned to periodic resources (for example, every 20 ms) and transmitted periodically by a BS (for example, BS 110) in a cell. For example, a set of SS blinks can include an L number of SSBs (for example, 4, 8, or 64). In certain respects, the L number of SSBs included in a set of SS blinks is based on the frequency band used for transmission. For example, for sub 6 GHz frequency transmissions, L can be equivalent to 4 or 8. In another example, for transmission above 6 GHz, L can be equivalent to 64. For example, transmission over BS 110 in a cell can be formation of beam, so that each transmission covers only a portion of the cell. Therefore, different SSBs in a set of SS blinks can be transmitted in different directions to cover the cell.
[0076] [0076] Figure 8 illustrates an example of the transmission delay of SSBs, in accordance with certain aspects. As shown, a set of SS 805 blinks can be transmitted periodically every X ms (for example, X = 20). In addition, the SS 805 flasher set can have a duration of Y ms (for example, Y <5), where all SSBs 810 in the SS 805 flasher set are transmitted within the Y duration. As shown in Figure 8 , each SSB 810 includes a PSS, SSS and PBCH. SSB 810 can correspond, for example, to an SSB 700. The SS 805 blink set includes a maximum of L SSBs 810 where each has a corresponding SSB index (for example, 0 to L-1) that indicates its location within the SS flashing set, for example, indicates the order of physical transmission over time of SSBs 810. Although SSBs 810 are shown consecutively allocated in time in the SS flashing set of SS 805, it should be noted that the 810 SSBs may not be allocated consecutively. For example, there may be a separation in time (for example, of the same or different durations) between SSBs 810 in the SS 805 flasher set. The time allocation of SSBs 810 may correspond to a particular pattern, which may be known to BS 110 and EU
[0077] [0077] In certain respects, an SSB transmitted by a BS 110 to a UE 120 is used to carry timing information about a cell served by BS 110 to the UE 120. For example, in certain respects, the SSB is used to indicate the system frame number (SFN) level timing in the cell. In one example, the periodic timing in the cell can be divided into system frames (for example, 1,024 system frames that have a duration of 10 ms each). Therefore, each system frame is assigned a sequential number (for example, from 0 to 1,023). In this example, the SSB is used to carry bits (for example, 10 bits that correspond to 210 system frames) of information (for example, in an SSB payload, based on an SSB configuration, etc.) to indicate the SFN on which the SSB is transmitted, then the UE has timing information for the SFN level (for example, 10 ms timing level).
[0078] [0078] In certain aspects, the SSB can be used, additionally, to carry information about timing within a system frame (for example, sub-10 ms timing). For example, the SSB can be used to carry an additional bit (for example, an 11th bit) (for example, in an SSB payload, based on an SSB configuration, etc.) to indicate an interval level. half system frame (for example, 5 ms) of timing (for example, indicating the first half / preamble of the system frame or the second half / midamble of the system frame in which the SSB is transmitted).
[0079] [0079] In certain respects, the bits for SFN level timing and additional bit for half SFN level timing may be sufficient to indicate the transmission timing of a set of SS blinks (for example, 5 ms). However, these bits may not be sufficient to indicate the timing level within the SS flashing set. Consequently, in certain respects, the level of timing within the SS flashing set can be indicated by the index of the individual SSBs transmitted in the SS flashing set. For example, as discussed, an UE 120 has information related to the pattern of SSBs in the SS burst set. Consequently, if the UE 120 has information related to when an SSB that has a particular SSB index is transmitted within the set of SS blinks, and determines the SSB index of a received SSB, it can determine the timing within the set flashing SS synchronized with the received SSB. Therefore, in certain aspects, the SSB can be used, in addition, to carry bits of information indicative of the SSB's SSB index. For example, when there is a maximum of L = 64 SSBs, 6 additional bits (for example, 26 = 64) can be carried by the SSB to indicate the SSB index of the SSB. In certain respects, therefore, the SSB can carry 17 bits (for example, 10 + 1 + 6) bits of information.
[0080] [0080] In certain respects, a number of bits (for example, 3 bits) can be carried based on a reference sequence, such as a DMRS sequence, used in an SSB. Although certain aspects are described in relation to a DMRS sequence, other types of sequences can be used. For example, there may be multiple candidate DMRS strings (for example, 8) that can be used for DMRS in an SSB, and the actual DMRS transmitted in the SSB can be indicative of the value (for example, 000 to 111) of the number of bits .
[0081] [0081] For example, in certain respects, DMRS is a function of the cell ID of the cell in which BS 110 transmits the SSB. In certain respects, the UE 120 uses the PSS and / or the SSS in the SSB to determine the cell ID of the cell in which the SSB is transmitted. In addition, for a given cell, there may be a number (for example, 8) of candidate DMRS sequences that can be used. Therefore, UE 120, based on the cell ID determined from the PSS and / or the SSS, can attempt to correlate the DMRS sequence received in the SSB to each of the number of candidate DMRS sequences for the cell ID. The candidate DMRS sequence with the highest correlation for the DMRS sequence received in the SSB can be the DMRS sequence used in the SSB, and therefore the UE 120 maps the DMRS sequence to a value of a number of bits (for example, 3).
[0082] [0082] In certain respects, a number of bits (for example, 14 bits) can be carried by the PBB of the SSB, for example, explicitly in a payload of the PBCH and / or implicitly (for example, through PBCH scramble (or redundancy version) where different scramble sequences (redundancy versions) correspond to different values of a number of bits). For example, similar to the DMRS sequence, a UE 120 may attempt to unscramble the PBCH using each of a number of different candidate sequences (for example, 4 candidate sequences to carry 2 bits). The correct candidate sequence that decodes the PBCH in the SSB can be the sequence used to scramble the PBCH and therefore the UE 120 maps the sequence to a value of a number of bits (for example, 2).
[0083] [0083] In certain respects, the payload of the PBCH can be transmitted that corresponds to a transmission delay interval (TTI) (for example, a broadcast channel TTI (BCH)). For example, the payload of the PBCH may not change during a BCH TTI duration (for example, 80 ms). This can allow the UE to combine multiple instances of PBCH received within the BCH TTI to improve decoding performance. Consequently, in certain respects, the payload of the PBCH in multiple consecutive sets of SS blinks (for example, 4) is the same. Therefore, an UE 120 that receives sets of SS blinks with the same PBCH payload can combine the PBCH payloads received from multiple sets of SS blobs to better decode the PBCH payload / improve detection (e.g. if there is low SNR, interference, etc.). In another example, the UE 120 may have the ability to test different sequences to unscramble PBCHs in different sets of SS blinks, as if the UE 120 does not have the memory / processing capacity to test all possible hypothesis sequences in a single SS flashing set. However, in certain respects, testing a number of different sequences can introduce complexity and latency to perform blind decoding. Consequently, certain aspects in this document tell the UE 120 the PBCH scrambling sequence used in the SSB to allow the UE 120 to use the appropriate scrambling sequence to unscramble PBCH without testing each possible sequence.
[0084] [0084] In some respects, there is no DMRS randomization through a set of SS blinks, which means that, for a given cell ID, the DMRS sequence used in an SSB is based solely on the SSB index. For example, if DMRS strings 1 through 6 are in order for the SSBs in an SS burst set, the same DMRS strings 1 through 6 are used in order for the SSBs in the following SS burst set. If there are two neighboring cells that are synchronized (or not) that transmit the SSB / DMRS overlapping resources, there may be collisions in the UE that receives the SSB / DMRS from each of the neighboring cells. If there is no randomization of DMRS, then the same set of DMRS sequences is received from neighboring cells (for example, potentially a different DMRS sequence from each cell) for a given SSB index in each set of SS blinks. If the DMRS sequences in the DMRS sequence set have a large cross-correlation, the UE 120 may not be able to properly detect DMRS. Without DMRS randomization, this may result in the UE 120 not being able to properly detect DMRS for each set of SS flares. With DMRS randomization, the chance that the DMRS sequences in the set will have a large cross-correlation in each set of intermittent SS decreases, potentially thereby mitigating detection problems.
[0085] [0085] In certain respects, the DMRS indicates a logical SSB index of the SSB instead of the actual physical SSB index of the SSB. For example, as discussed, each SSB is physically located in time in a physical index order in the SS burst. However, instead of the DMRS directly indicating the physical SSB index, the DMRS can indicate a logical SSB index that is mapped (for example, by a function, table, etc.) to the SSB physical SSB index . For example, each physical SSB index can be mapped to a different value that corresponds to a logical SSB index (for example, 0, 1, 2, 3, 4, 5, 6, are mapped to 2, 3, 4, 5, 6, 7, 0, 1, respectively). Therefore, in certain respects, for a given SSB that has a certain physical SSB index, the DMRS sequence transmitted in the physical SSB index is based on the logical SSB index associated with the physical SSB index.
[0086] [0086] In certain aspects, the mapping of the physical SSB index to the logical SSB index is a function of some cell timing information. For example, the mapping may be a function of an SS burst index within a BCH TTI in which the SSB is transmitted. As discussed, a number of consecutive sets of resources that correspond to sets of SS bursts can be used to transmit in a BCH TTI, and each can have a set index out of the plurality of feature sets called an array set index. flashes of SS that corresponds to its position in the BCH TTI. In addition or alternatively, the mapping of the physical SSB index to the logical SSB index is a function of a cell ID in which the SSB is transmitted.
[0087] [0087] Using DMRS to indicate a logical SSB index instead of a physical SSB index, certain advantages can be seen. For example, based on the logical SSB index on the SS intermittent set index, DMRS is randomized through different SS intermittent set indexes, potentially thereby mitigating detection problems, as discussed. However, in such an example, in order to map the logical SSB index to the physical SSB index, the UE 120 may need knowledge of the BCH TTI boundaries to know the SS burst set index. The UE 120 can determine such information related to BCH TTI boundaries for a UE server cell by decoding PBCH (which includes information about the SS burst index), which the UE 120 may need to perform anyway during acquisition starting cell. In addition, to determine such information for a neighboring cell, the UE may receive timing information from the neighboring cell from the server cell explicitly as an indication, or may derive it based on the timing of the service cell in which the cell server and neighbor cell are synchronized within a maximum timing offset (for example, within +/- 10).
[0088] [0088] In certain respects, the DMRS indicates a logical SSB index of the SSB instead of the actual physical SSB index of the SSB only for certain cells, frequency bands (for example, above 6 GHz), numerologies (for example, for 240 KHz tone spacing), implementations (for example, implementations with synchronous cells), scenarios (for example, non-autonomous operation, initial acquisition synchronization, synchronization for one or more UEs in an RRC idle or RRC connected state ), etc. In other situations, DMRS may indicate the actual physical SSB index.
[0089] [0089] In certain respects, mapping the physical SSB index on an SS burst set to a logical SSB index on an SS burst set may not be dependent on the cell ID or burst set index of SS. In certain aspects, the physical to logical SSB index mapping can be according to the following equation (1): (1)
[0090] [0090] Here, p is the physical SSB index of the SSB in a set of SS blinks (for example, p ϵ {0.1, ..., L - 1} (for example, L = 4.8, 64)); c is the cell ID of the cell in which the SSB is transmitted (for example, c ϵ {0.1, ..., 1007}); b is the SS burst set index (for example, within BCH TTI) of the SS burst set on which SSB is transmitted (eg, b ϵ {0,1,2,3}); l is the logical SSB index of the SSB in a set of SS blinks (for example, (for example, L '= 4,8,64), L' can be the same or different from L); e is a function of the physical index, for example, or Although, in general, the logical index l can be a function of any combination of p, c and b; in an example that corresponds to equation 1, l does not depend on cell ID c or SS b burst index. In certain respects, equation 1 does not provide randomization of DMRS. For example, the DMRS sequence indicates the physical SSB index, as shown according to table 1 below based on equation 1 (where and for each b maps to l = (0,1,2,3,4 , 5,6,7)). In this table, it is used to denote the sequence of logical SSB indices, for physical indices p = (0,1,2, ..., 7), for a given cell ID c and SS b burst index: Table 1 b 0 1 2 3 l (0: 7, c, b) (0,1,2,3,4,5,6,7) (0,1,2,3,4,5,6,7 ) (0,1,2,3,4,5,6,7) (0,1,2,3,4,5,6,7)
[0091] [0091] In certain respects, the mapping of the physical SSB index on an SS burst set to a logical SSB index on an SS burst set may be dependent on the burst set index. In certain aspects, the mapping from physical to logical index can be according to the following equation (2): and for the intermittent set index b = 0, the mapping can be
[0092] [0092] Here, ∆ can be a non-zero constant value (for example, ∆ = 1,2, ..., L'-1; more specifically, ∆ can be chosen so that a physical index maps to the same logical index at the beginning of each BCH TTI (for example, ∆ = 2 when L '= 8 and b = 0,1,2,3)). The sum in equation 2 can be in module L ', for the certification that l obtains values in (0.1, ..., L’-1)). In certain respects, equation 2 provides some randomization of DMRS since the mapping of the physical SSB index to an SS burst index to a logical SSB index is based on the SS burst index. For example, the mapping of physical SSB index to logical SSB index is different for different values of b, as shown according to table 2 below based on equation 2 and for ∆ = 2: Table 2 b 0 1 2 3 l (0: 7, c, b) (0,1,2,3,4,5,6,7) (2,3,4,5,6,7,0,1) (4,5 , 6,7,0,1,2,3) (6,7, 0,1,2,3,4,5)
[0093] [0093] In certain aspects, the project based on equation 2 explores the directionality (for example, beam formation) of SSB transmissions. For example, if two neighboring cells are each bundled in different directions, then the UE 120 can receive SSB from one or two of the cells in just one particular SSB within an SSB burst. In this example, for each SS burst set index, different pairs of DMRS strings (corresponding to the different logical SSB indexes) are transmitted to a given SSB index, thereby reducing the probability that the DMRS sequence pair have a high correlation for the given SSB index in each SS burst set index.
[0094] [0094] In certain respects, the design based on equation 2 allows a UE 120 to combine DMRS for SSBs both within the same SBB flares and through different SSB flares to perform hypothesis verification (to determine the actual DMRS sequence, as discussed). In particular, the logical indexes that correspond to the DMRS strings in consecutive SSBs in an SSB burst are incremented by 1, so if the UE 120 can detect two consecutive or non-consecutive SSBs, it knows about the increment in the logical index used for sequences DMRS and can combine the DMRS strings. Similarly, DMRS strings in the same physical SSB index in consecutive sets of SS blinks (for example, at least within a BCH TTI) are incremented by ∆, so the UE 120 can combine the DMRS strings.
[0095] [0095] In certain respects, mapping the physical SSB index in a SS burst to a logical SSB index in a SS burst can depend on both the cell ID and the burst set index. In certain aspects, the mapping from physical to logical index can be according to the following equation (3): (3) Where is a value (for example, in 0.1, ..., L ') that depends on the Cell ID c. For example, one can have and for the burst set index b = 0, the mapping can be
[0096] [0096] The sum in equation 3 can be in module L ', for the certification that l obtains values in (0.1, ..., L’- 1)). In certain respects, equation 3 provides additional DMRS randomization, since the mapping of the physical SSB index on a set of SS blinks to a logical SSB index is based on the cell ID and the SS blink set index. . For example, the mapping of physical SSB index to logical SSB index is different for different values of b and c, as shown according to the following table 3 based on equation 3: Table 3 b 0 1 2 3 0 (0, 1,2,3,4,5,6,7) (0,1,2,3,4,5,6,7) (0,1,2,3,4,5,6,7) (0 , 1,2,3,4,5,6,7) mod (c, 8) 1 (0,1,2,3,4,5,6,7 (1,2,3,4,5,6 , 7.0 (2,3,4,5,6,7,0,1 (3,4,5,6,7,))) 0,1,2) 2 (0,1,2,3, 4,5,6,7 (2,3,4,5,6,7,0,1 (4,5,6,7, (6,7,)) 0,1,2,3) 0,1 , 2,3,4,5) 3 (0,1,2,3,4,5,6,7 (3,4,5,6,7, (6,7, (1,2,3,4 , 5,6,7,0) 0,1,2) 0,1,2,3,4,5)
[0097] [0097] In certain respects, the design based on equation 3 is similar to the design based on equation 2, except that the amount by which an SSB's logical SSB index is incremented from an SSB blink index to the next up based on c is not just a constant value A, as in equation 2.
[0098] [0098] In certain aspects, the mapping of the physical SSB index in a set of SS blinks to a logical SSB index in a set of SS blinks can be according to the following equation (4): (4) and for the burst set index b = 0, the mapping can be
[0099] [0099] The sum in equation 4 can be in module L ', for the certification that l obtains values in (0.1, ..., L’- 1)). In certain respects, equation 4 provides additional DMRS randomization, since the mapping of the physical SSB index in a set of SS blinks to a logical SSB index is based on the cell ID and the SS blink set index. similarly to equation 3. However, instead of the amount by which the logical SSB index of one SSB is incremented from one SSB blink index for the next to be based on c only, as in equation 3, the amount in that the logical SSB index of one SSB is incremented from one SSB blink index to the next is based on b and c. Consequently, in certain respects, when the UE 120 receives DMRS strings in the same or different physical SSB in consecutive or non-consecutive SS burst sets, it can perceive the difference between the DMRS strings (for example, the difference between the logical indices and, based on the difference, determine the SS burst set index of the SS burst sets, since the delta difference between the DMRS strings is specific to the SS burst sets.
[0100] [0100] In certain respects, for a given c, the value of for each possible value (or at least some of the values) of b is different (for example, to allow the UE 120 to determine the SS burst index at least partially based on two DMRS received in two different sets of SS flashes. In certain respects, the sum of the values of for each possible value of b module L 'is 0 in order to automatically continue to the same initial state at the beginning of the next BCH TTI (for example,
[0101] [0101] For example, the mapping of physical SSB index to logical SSB index is different for different values of b and c, as shown according to the following table 4 based on equations 4 and 5: Table 4 b 0 1 2 3 4 0 (0,1,2,3,4, (0,1,2,3,4, (2,3,4,5,6, (7,0,1,2,3, (0, 1,2,3,4, mod 5,6,7) 5,6,7) 7,0,1) 4,5,6) 5,6,7) (c, 8) 1 (0,1, 2,3,4, (1,2,3,4,5, (4,5,6,7, (1,2,3,4,5, (0,1,2,3,4, 5, 6.7) 6.7.0) 0.1.2.3) 6.7.0) 5.6.7) 2 (0.1,2,3,4, (2,3,4,5 , 6, (6,7,0,1,2, (5,6,7,0,1, (0,1,2,3,4, 5,6,7) 7,0,1) 3, 4.5) 2.3.4) 5.6.7) 3 (0.1,2,3,4, (3,4,5,6,7, (0,1,2,3,4, (7,0,1,2,3, (0,1,2,3,4, 5,6,7) 0,1,2) 5,6,7) 4,5,6) 5,6, 7) 4 (0,1,2,3,4, (4,5,6,7, (2,3,4,5,6, (3,4,5,6,7, (0,1, 2,3,4, 5,6,7) 0,1,2,3) 7,0,1) 0,1,2) 5,6,7) 5 (0,1,2,3,4, (5,6,7,0,1, (4,5,6,7, (5,6,7,0,1, (0,1,2,3,4, 5,6,7) 2, 3.4) 0.1.2.3) 2.3.4) 5.6.7) 6 (0.1,2,3,4, (6,7,0,1,2, (6, 7.0,1.2, (1,2,3,4,5, (0,1,2,3,4, 5,6,7) 3,4,5) 3,4,5) 6, 7.0) 5.6.7) 7 (0.1,2,3,4, (7,0,1,2,3, (0,1,2,3,4, (3,4,5 , 6,7, (0,1,2,3,4, 5,6,7) 4,5,6) 5,6 , 7) 0,1,2) 5,6,7)
[0102] [0102] In certain aspects, as discussed, the L number of SSBs in a set of SS blinks is based on the transmission frequency range. Consequently, in certain respects, the number of possible DMRS strings (for example, 8) per cell ID may be greater than the number of SSBs (for example, 4) in a set of SS blinks. Therefore, less than the totality of the defined DMRS strings may be required to indicate SSB index of the SSBs. Consequently, in certain respects, multiple DMRS strings can be mapped to the same SSB index (for example, logical or physical SSB index). The DMRS sequence selected from multiple DMRS strings to indicate a given SSB index,
[0103] [0103] In another example, less than the totality of the defined DMRS strings is transmitted to indicate SSB index, and therefore the UE 120 may need to perform hypothesis testing only for a subset of DMRS strings. In certain respects, the subset of DMRS strings used may be dependent on cell ID or burst set index. The UE 120 may then need to perform hypothesis testing for all DMRS sequences, but it may also then use the techniques described for logical to physical SSB index mapping.
[0104] [0104] Figure 9 illustrates exemplary 900 operations for wireless communications, for example, to generate and communicate reference signals. According to certain aspects, operations 900 can be performed by a BS (for example, one or more among BSs 110).
[0105] [0105] Operations 900 begin in 902, in which BS selects a reference sequence from a plurality of reference sequences to transmit in a cell in a synchronization signal block (SSB) based on at least one logical value , where the logical value is determined based on an SSB index that indicates a location of the SSB within a resource set among a plurality of resource sets and at least one among a cell cell ID, a set index which indicates a location of the resource pool within the plurality of resource pools, or a second value based on system information that corresponds to the cell. In step 904, the BS transmits the selected reference sequence on the SSB.
[0106] [0106] Figure 10 illustrates exemplary operations 1000 for wireless communications, for example, to receive reference signals and determine timing information based on the reference signals. According to certain aspects, operations 1000 can be performed by user equipment (for example, one or more among the UEs 120).
[0107] [0107] Operations 1000 are initiated at step 1002, in which the UE receives a reference sequence from among a plurality of reference sequences. In step 1004, the UE receives an indication of a cell ID associated with the reference sequence. In step 1006, the UE determines timing information for the cell based on the received reference sequence and the cell ID. In certain aspects, the UE does not receive the cell ID. In certain respects, the UE determines half-frame timing information for the cell based on the received reference sequence (for example, on an SSB).
[0108] [0108] Figure 11 illustrates a communications device 1100 that can include various components (for example, that correspond to half more function components) configured to perform operations for the techniques disclosed in this document, such as the operations illustrated in Figure 9. The Communications device 1100 includes a processing system 1102 coupled to a transceiver 1108. Transceiver 1108 is configured to transmit and receive signals to communications device 1100 via an antenna 1110, such as the various signals described in this document. The processing system 1102 can be configured to perform processing functions for the communications device 1100, including processing signals received and / or to be transmitted by the communications device 1100.
[0109] [0109] Processing system 1102 includes a processor 1104 coupled to a computer-readable memory / media 1112 via a 1106 bus. In certain aspects, the computer-readable memory / media 1112 is configured to store instructions that, when executed by processor 1104, cause processor 1104 to perform the operations illustrated in Figure 9, or other operations to perform the various techniques discussed in this document.
[0110] [0110] In certain respects, processing system 1102 additionally includes a selection component 1114 to perform the operations illustrated in step 902 of Figure 9. Additionally, processing system 1102 includes a transmission component 1116 to perform operations illustrated in step 904 of Figure 9. Selection component 1114 and transmission component 1116 can be coupled to processor 1104 via bus 1106. In certain respects, selection component 1114 and transmission component 1116 can be hardware. In certain respects, the selection component 1114 and the transmission component 1116 can be software components that run and run on processor 1104.
[0111] [0111] Figure 12 illustrates a communications device 1200 that can include various components (for example, that correspond to components plus function) configured to perform operations for the techniques disclosed in this document, such as the operations illustrated in Figure 10. The Communications device 1200 includes a processing system 1202 coupled to a transceiver 1208. Transceiver 1208 is configured to transmit and receive signals to communications device 1200 via an antenna 1210, such as the various signals described in this document. Processing system 1202 can be configured to perform processing functions for communications device 1200, including processing signals received and / or to be transmitted by communications device 1200.
[0112] [0112] Processing system 1202 includes a processor 1204 coupled to a computer-readable memory / media 1212 via a 1206 bus. In certain aspects, the computer-readable memory / media 1212 is configured to store instructions that, when executed by processor 1204, cause processor 1204 to perform the operations illustrated in Figure 10, or other operations to perform the various techniques discussed in this document.
[0113] [0113] In certain respects, processing system 1202 additionally includes a receiving component 1214 to perform the operations illustrated in 1002 and 1004 of Figure 10. Additionally, processing system 1202 includes a determining component 1216 to perform operations illustrated in 1006 of Figure 10. Receiving component 1214 and determining component 1216 can be coupled to processor 1204 via bus 1206. In certain aspects, receiving component 1214 and determining component 1216 can be hardware. In certain respects, the receiving component 1214 and the determining component 1216 can be software components that run and run on processor 1204.
[0114] [0114] Figure 13 illustrates exemplary 1300 operations for wireless communications, for example, to generate and communicate reference signals. According to certain aspects, 1300 operations can be performed by a BS (for example, one or more among the BSs 110).
[0115] [0115] Operations 1300 start in 1302, in which BS selects a demodulation reference sequence (DMRS) from a plurality of DMRSs for transmission in a synchronization signal block (SSB) based on a half frame in which the SSB is transmitted. In 1304, BS transmits the DMRS selected in the SSB.
[0116] [0116] Figure 14 illustrates a communications device 1400 that can include various components (for example, that correspond to components plus function) configured to perform operations for the techniques disclosed in this document, such as the operations illustrated in Figure 13. The Communications device 1400 includes a processing system 1402 coupled to a transceiver 1408. Transceiver 1408 is configured to transmit and receive signals to communications device 1400 via an antenna 1410, such as the various signals described in this document. Processing system 1402 can be configured to perform processing functions for communications device 1400, including processing signals received and / or to be transmitted by communications device 1400.
[0117] [0117] Processing system 1402 includes a processor 1404 coupled to a computer-readable memory / media 1412 via a 1406 bus. In certain aspects, the computer-readable memory / media 1412 is configured to store instructions that, when executed by processor 1404, cause processor 1404 to perform the operations illustrated in Figure 13, or other operations to perform the various techniques discussed in this document.
[0118] [0118] In certain respects, processing system 1402 additionally includes a selection component 1414 to perform the operations illustrated in 1302 of Figure 13. Additionally, processing system 1402 includes a transmission component 1416 to perform the operations illustrated at 1304 of Figure 13. Selection component 1414 and transmission component 1416 can be coupled to processor 1404 via the bus
[0119] [0119] The methods disclosed in this document comprise one or more steps or actions to execute the methods. The steps and / or method actions can be alternated with each other without departing from the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and / or use of specific steps and / or actions can be modified without departing from the scope of the claims.
[0120] [0120] As used in this document, an expression that refers to “at least one of” a list of items refers to any combination of those items, including unitary members. As an example, “at least one of: a, b or c” is intended to cover a, b, c, ab, ac, bc and abc, as well as any combination with multiples of the same element (for example, aa, aaa , aa- b, aac, abb, acc, bb, bbb, bbc, cc and ccc or any other order of a, b and c).
[0121] [0121] As used in this document, the term “determine” covers a wide range of actions. For example, "determine" may include calculating, computing, processing, deriving, investigating, querying (for example, querying a table, a database or other data structure), verifying and the like. In addition, "determining" may include receiving (for example, receiving information), accessing (for example, accessing data in a memory) and the like. In addition, "determining" may include resolving, selecting, choosing, establishing and the like.
[0122] [0122] The above description is provided to enable anyone skilled in the art to practice the various aspects described in this document. Several changes to these aspects will be readily apparent to those skilled in the art, and the generic principles defined in this document can be applied to other aspects. Accordingly, the claims are not intended to be limited to the aspects shown in this document, but must be in accordance with the full scope consistent with the language of the claims, where reference to an element in the singular is not intended to mean “one and only one ”unless specifically stated, but“ one or more ”instead. Unless specifically stated otherwise, the term "some" refers to one or more. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure which are known or will become known subsequently by those of ordinary skill in the art are expressly incorporated by reference in this document and are intended to be covered by the claims. In addition, nothing disclosed in this document is intended to be dedicated to the public regardless of whether such disclosure is explicitly cited in the claims. No claiming element shall be interpreted under the provisions of Title 35 of USC §112 (f), unless the element is expressly cited using the expression “means for” or, in the case of a method claim, the element is quoted with the use of the expression “step to”.
[0123] [0123] The various method operations described above can be performed by any suitable means that has the ability to perform the corresponding functions. The medium may include various hardware and / or software component (s) and / or module (s), including, but not limited to, a circuit, an application specific integrated circuit (ASIC) or processor. Generally speaking, when there are operations illustrated in the figures, these operations can have components with more or less corresponding functions with similar numbers.
[0124] [0124] The various circuits, modules and illustrative logic blocks, described together with the present disclosure, can be implemented or carried out with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC ), a field programmable port arrangement (FPGA) or other programmable logic device (PLD), discrete port or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this document. A general purpose processor can be a microprocessor, but alternatively, the processor can be any commercially available processor, controller, microcontroller, or state machine. A processor can also be deployed as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core or any other such configuration.
[0125] [0125] If deployed on hardware, an exemplary hardware configuration may comprise a processing system on a wireless node. The processing system can be deployed with a bus architecture. The bus can include any number of interconnecting buses and bridges depending on the specific application of the processing system and general design restrictions. The bus can connect several circuits together, including a processor, machine-readable media and a bus interface. The bus interface can be used to connect a network adapter, among other things, to the processing system via the bus. The network adapter can be used to implement the PHY layer signal processing functions. In the case of a 120 user terminal (see Figure 1), a user interface (for example, numeric keypad, display, mouse, joystick, etc.) can also be connected to the bus. The bus can also connect several other circuits, such as timing sources, peripherals, voltage regulators, power management circuits and the like, which are well known in the art and therefore will not be described further. The processor can be deployed with one or more general purpose and / or special purpose processors. Examples include microprocessors, microcontrollers, DSP processors and other circuits that can run software. Those skilled in the art will recognize how to best deploy the functionality described for the processing system depending on the particular application and the general design restrictions imposed on the general system.
[0126] [0126] If implemented in software, the functions can be stored or transmitted as one or more instructions or code on a computer-readable medium. Software must be interpreted broadly to mean instructions, data or any combination thereof, whether called software, firmware, middleware, microcode, hardware description language or otherwise. Computer-readable media includes both computer storage media and communication media that include any media that facilitates the transfer of a computer program from one location to another. The processor may be responsible for managing the bus and general processing, including running software modules stored on machine-readable storage media. Computer-readable storage media can be attached to a processor so that the processor can read information from the storage media and record information on it. Alternatively, the storage media can be integral to the processor. For example, machine-readable media may include a transmission line, a data-modulated carrier wave, and / or a computer-readable storage medium with instructions stored on it separate from the wireless node, all of which can be accessed by the processor through the bus interface. Alternatively or additionally, machine-readable media, or any portion thereof, can be integrated into the processor, as may be the case with cache and / or general log files. Examples of machine-readable storage media may include, for example, RAM (random access memory), flash memory, ROM (read-only memory), PROM (programmable read-only memory), EPROM (read-only memory) programmable erasable), EEPROM (electrically erasable programmable read-only memory), registers, magnetic disks, optical disks, hard disks or any other suitable storage media or any combination thereof. Machine-readable media can be incorporated into a computer program product.
[0127] [0127] A software module can comprise a single instruction or many instructions, and can be distributed over several different code segments, between different programs, and across multiple storage media. Computer-readable media can comprise several software modules. The software modules include instructions that, when executed by a device, such as a processor, cause the processing system to perform various functions. Software modules can include a transmit module and a receive module. Each software module can reside on a single storage device or be distributed across multiple storage devices. For example, a software module can be loaded into RAM from a hard drive when a trigger event occurs. During the execution of the software module, the processor can load some of the cached instructions to increase the access speed. One or more lines of cache can then be loaded into a general log file for execution via the processor. When referring to the functionality of a software module below, it will be understood that such functionality is implemented by the processor when executing instructions from that software module.
[0128] [0128] In addition, any connection is appropriately 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 wireless technologies, such as such as infrared (IR), radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwave are included in the media definition. Magnetic disk and optical disk, as used in this document, include compact disk (CD), laser disk, optical disk, digital versatile disk (DVD), floppy disk and Blu-ray® disk on which magnetic disks normally reproduce data magnetically, while disks optical devices reproduce data optically with lasers. Thus, in some ways, computer-readable media may comprise non-transitory computer-readable media (for example, tangible media). In addition, in other respects, computer-readable media may comprise transitory computer-readable media (for example, a signal). Combinations thereof must also be included in the scope of computer-readable media.
[0129] [0129] Thus, certain aspects may comprise a computer program product to perform the operations presented in this document. For example, such a computer program product may comprise a computer-readable medium that has instructions stored (and / or encoded) in it, where the instructions are executable by one or more processors to perform the operations described in this document. For example, instructions for performing the operations described in this document and illustrated in Figures 9, 10 and 13.
[0130] [0130] Additionally, it should be verified that modules and / or other appropriate means to carry out the methods and techniques described in this document can be downloaded and / or otherwise obtained by a user terminal and / or base station, as applicable. For example, such a device can be coupled to a server to facilitate the transfer of media to carry out the methods described in this document. Alternatively, several methods described in this document can be provided through storage media (for example, RAM, ROM, physical storage media, such as a compact disc (CD) or floppy disk, etc.), so that a user and / or base station can obtain the various methods by coupling or supplying the storage medium to the device. In addition, any other technique suitable for providing the methods and techniques described in this document to a device may be used.
[0131] [0131] It should be understood that the claims are not limited to the precise configuration and components illustrated above. Various modifications, changes and variations can be made to the layout, operation and details of the methods and apparatus described above without departing from the scope of the claims.

权利要求:
Claims (28)
[1]
1. Method for communicating reference signals, characterized by the fact that it comprises: selecting a demodulation reference sequence (DMRS) from among a plurality of DMRSs for transmission in a synchronization signal block (SSB) based on a half frame in the which the SSB is transmitted; and transmit the DMRS selected on the SSB.
[2]
2. Method, according to claim 1, characterized by the fact that the half frame is part of a system frame.
[3]
3. Method according to claim 1, characterized by the fact that the SSB is one of a plurality of SSBs in a set of flashing synchronization signal (SS) comprising four SSBs.
[4]
4. Method, according to claim 3, characterized by the fact that the selection of DMRS is based, additionally, on an SSB index.
[5]
5. Method, according to claim 4, characterized by the fact that each of the plurality of SSBs is transmitted in a separate space beam.
[6]
6. Method, according to claim 1, characterized by the fact that the SSB includes a physical diffusion channel (PBCH).
[7]
7. Method, according to claim 1, characterized by the fact that the selection of the DMRS is based, additionally, on an SSB index.
[8]
8. Wireless device characterized by the fact that it comprises: a memory; and a process configured to: select a demodulation reference sequence (DMRS) from among a plurality of DMRSs for transmission in a synchronization signal block (SSB) based on a half frame in which the SSB is transmitted; and transmit the DMRS selected on the SSB.
[9]
9. Wireless device according to claim 8, characterized by the fact that the half frame is part of a system frame.
[10]
10. Wireless device according to claim 8, characterized by the fact that the SSB is one of a plurality of SSBs in a set of flashing synchronization signals (SS) comprising four SSBs.
[11]
11. Wireless device according to claim 10, characterized by the fact that the selection of the DMRS is additionally based on an SSB index.
[12]
12. Wireless device according to claim 11, characterized by the fact that each of the plurality of SSBs is transmitted in a separate space beam.
[13]
13. Wireless device according to claim 8, characterized by the fact that the SSB includes a physical broadcast channel (PBCH).
[14]
14. Wireless device, according to claim 8, characterized by the fact that the selection of the DMRS is additionally based on an SSB index.
[15]
15. Wireless device characterized by the fact that it comprises: means for selecting a demodulation reference sequence (DMRS) from a plurality of DMRSs for transmission in a synchronization signal block (SSB) based on a half frame in which the SSB is transmitted; and means to transmit the DMRS selected in the SSB.
[16]
16. Wireless device according to claim 15, characterized by the fact that the half frame is part of a system frame.
[17]
17. Wireless device according to claim 15, characterized by the fact that the SSB is one of a plurality of SSBs in a set of flashing synchronization signals (SS) comprising four SSBs.
[18]
18. Wireless device according to claim 17, characterized by the fact that the selection of the DMRS is additionally based on an SSB index.
[19]
19. Wireless device according to claim 18, characterized by the fact that each of the plurality of SSBs is transmitted in a separate space beam.
[20]
20. Wireless device according to claim 15, characterized by the fact that the SSB includes a physical broadcast channel (PBCH).
[21]
21. Wireless device according to claim 15, characterized by the fact that the selection of DMRS is additionally based on an SSB index.
[22]
22. Non-transitory, computer-readable storage media characterized by the fact that it stores instructions that, when executed by a wireless device, cause the wireless device to perform a method for communicating reference signals, the method comprises:
selecting a demodulation reference sequence (DMRS) from among a plurality of DMRSs for transmission in a synchronization signal block (SSB) based on a half frame in which the SSB is transmitted; and transmit the DMRS selected on the SSB.
[23]
23. Non-transitory, computer-readable storage media according to claim 22, characterized by the fact that the half frame is part of a system frame.
[24]
24. Non-transitory, computer-readable storage media according to claim 22, characterized by the fact that the SSB is one of a plurality of SSBs in a set of sync signal blinks (SS) comprising four SSBs.
[25]
25. Non-transitory, computer-readable storage media according to claim 24, characterized by the fact that the selection of the DMRS is additionally based on an SSB index.
[26]
26. Non-transitory, computer-readable storage media according to claim 25, characterized by the fact that each of the plurality of SSBs is transmitted in a separate space beam.
[27]
27. Non-transitory, computer-readable storage media according to claim 22, characterized by the fact that the SSB includes a physical broadcast channel (PBCH).
[28]
28. Non-transitory, computer-readable storage media according to claim 22, characterized by the fact that the selection of the DMRS is additionally based on an SSB index.

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