method and apparatus for transmitting or receiving signals in a wireless communication system

专利摘要:
in accordance with an embodiment of the present invention, a method of receiving dci by a eu includes receiving grouping information pertaining to regs via upper layer signaling, performing blind detection for a pdcch in a corset configured in a plurality of ofdm symbols and acquire dci from pdcch. when grouping information indicates a first value, the eu can perform grouping so that only regs located in the same rb and corresponding to different ofdm symbols in the corset are grouped as 1 reg grouping, and when grouping information indicates a second value, the eu can perform the grouping so that the regs located in the same rb and corresponding to the different symbols ofdm are grouped as grouping of 1 reg together with regs located in different rbs in the corset, and the eu can perform blind detection of the pdcch assuming the same pre-coding for regs belonging to the same reg grouping as a result of reg grouping.
公开号:BR112019001575A2
申请号:R112019001575
申请日:2018-04-24
公开日:2019-12-17
发明作者:Seo Inkwon；Yi Yunjung
申请人:Lg Electronics Inc；
IPC主号:

专利说明:

"METHOD AND APPARATUS FOR TRANSMISSION OR RECEPTION OF SIGNAL IN WIRELESS COMMUNICATION SYSTEM"
TECHNICAL FIELD [001] The present invention relates to a wireless communication system, and, more particularly, to a method and apparatus for transmitting and receiving downlink control (DL) information in a wireless communication system.
PREVIOUS TECHNIQUE [002] First, the existing LTE / LTE-A 3GPP system will be briefly described. Referring to Figure 1, the UE performs an initial cell search (S101). In the initial cell search process, the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from a base station, performs downlink synchronization with the BS, and acquires information, such as as a cell ID. Therefore, the UE acquires system information (for example, MIB) through a PBCH (Physical Transmission Channel). The UE can receive the DL RS (Downlink Reference Signal) and check the status of the downlink channel.
[003] After the initial cell search, the UE can acquire more detailed system information (for example, SIBs) by receiving a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) programmed by the PDCCH (S102).
[004] The UE can perform a random access procedure for uplink synchronization. The UE transmits a preamble (for example, Msg1) via a physical random access channel (PRACH) (S103), and receives a response message (for example, Msg2) to the preamble via PDCCH and PDSCH corresponding to the PDCCH. In the case of contention-based random access, a contention resolution procedure, such as PRACH transmission (S105) and reception of additional PDCCH / PDSCH (S106), can be performed.
[005] The UE can then receive PDCCH / PDSCH (S107)
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2/54 and Uplink Shared Physical Channel (PUSCH) / Uplink Physical Control Channel (PUCCH) transmission (S108) as a general uplink / downlink signal transmission procedure. The UE can transmit UCI (Uplink Control Information) to the BS. The UCI may include HARQ ACK / NACK (Hybrid Automatic Repeat Request Confirmation / Negative ACK), SR (Programming Request), CQI (Channel Quality Indicator), PMI (Pre-Coding Matrix Indicator) and / or RI etc.
DISCLOSURE
TECHNICAL PROBLEM [006] An object of the present invention designed to solve the problem consists of a method and apparatus for more effective and accurate transmission or reception of downlink control information through group grouping of resource elements (REG) in the communication system wireless.
[007] It should be understood that both the above general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
TECHNICAL SOLUTION [008] In one aspect of the present invention to achieve the object of the present invention, a method of receiving downlink control information by a user equipment (UE) in a wireless communication system includes receiving, via signaling from upper layer, grouping information for groups of resource elements (REGs), each of the REGs corresponding to 1 resource block (RB) and 1 orthogonal frequency division multiplexing symbol (OFDM); perform blind detection for a physical downlink control channel (PDCCH) on a set of control resources (CORESET) configured on a plurality of OFDM symbols; and acquire downlink control information (DCI) from the blindly detected PDCCH, where, in blind detection to the PDCCH, when the clustering information indicates a first value, the
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UE can perform the grouping so that only REGs located in the same RB and corresponding to different OFDM symbols in CORESET are grouped as 1 REG grouping and, when the grouping information indicates a second value, the UE can perform the grouping so that the REGs located in the same RB and corresponding to the different OFDM symbols are grouped as a grouping of 1 REG together with REGs located in different RBs in CORESET, and in which the UE can perform blind detection of the PDCCH assuming the same pre-coding for REGs that belong to the same REG cluster as a result of the REG cluster.
[009] In another aspect of the present invention, a method of transmitting downlink control information by a base station (BS) in a wireless communication system includes transmitting, via upper layer signaling, grouping information for groups resource elements (REGs), each of the REGs corresponding to 1 resource block (RB) and 1 orthogonal frequency division multiplexing symbol (OFDM); and transmit downlink control information (DCI) through a physical downlink control channel (PDCCH) in a set of control resources (CORESET) configured in a plurality of OFDM symbols, in which, in the transmission of DCI, when the information of grouping indicate a first value, BS can perform grouping so that only REGs located in the same RB and corresponding to different OFDM symbols in CORESET are grouped as grouping of 1 REG, when grouping information indicates a second value, BS can perform the grouping so that the REGs located in the same RB and corresponding to the different OFDM symbols are grouped as a grouping of 1 REG together with REGs located in different RBs in CORESET, and in which the BS can transmit DCI applying the same pre-coding for REGs belonging to the same REG group as a result of the REG group.
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4/54 [010] In another aspect of the present invention, a user equipment (UE) for receiving downlink control information includes a receiver; and a processor to receive, through upper layer signaling using the receiver, grouping information for groups of resource elements (REGs), each of the REGs corresponding to 1 resource block (RB) and 1 division multiplexing symbol orthogonal frequency (OFDM), to perform blind detection for a physical downlink control channel (PDCCH) in a set of control resources (CORESET) configured in a plurality of OFDM symbols, and to acquire downlink control information (DCI) from the Blindly detected PDCCH, where, in blind detection for PDCCH, when the cluster information indicates a first value, the processor can perform the grouping so that only REGs located in the same RB and corresponding to different OFDM symbols in CORESET are grouped as grouping of 1 REG and, when the grouping information indicates a second value, the processor can perform grouping so that REGs located in the same RB and corresponding to the different OFDM symbols are grouped as a grouping of 1 REG together with REGs located in different RBs in CORESET, and in which the processor can perform blind detection of the PDCCH assuming the same pre-coding for REGs that belong to the same REG cluster as a result of the REG cluster.
[011] In another aspect of the present invention, a base station (BS) for transmitting downlink control information includes a transmitter; and a processor to transmit, through upper layer signaling using the transceiver, grouping information for groups of resource elements (REGs), each of the REGs corresponding to 1 resource block (RB) and 1 division multiplexing symbol orthogonal frequency (OFDM), and to transmit downlink control information (DCI) through a physical
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5/54 downlink control (PDCCH) in a set of control resources (CORESET) configured in a plurality of OFDM symbols, in which, in the transmission of DCI, when the grouping information indicates a first value, the processor can perform the grouping so that only REGs located in the same RB and corresponding to different OFDM symbols in CORESET are grouped as grouping of 1 REG, when the grouping information indicates a second value, the processor can perform grouping so that the REGs located in the same RB and corresponding to the different OFDM symbols are grouped as grouping of 1 REG together with REGs located in different RBs in CORESET, and where the processor can transmit DCI applying the same pre-coding to REGs belonging to the same grouping of REG as a result of grouping of REG.
[012] When the grouping information indicates the first value, the grouping size of 1 REG can be configured to be the same as the number of the plurality of OFDM symbols to configure CORESET.
[013] When the grouping information indicates the second value, the grouping size of 1 REG can be configured to be the same as the number of REGs included in 1 control channel element (CCE).
[014] One or more CORESETs including CORESET can be configured in the UE. Grouping information and a type of control channel element mapping (CCE) -to-REG can be indicated for each of the one or more CORESETs.
[015] Cluster information can include cluster size information indicating the number of REGs included in the cluster of 1 REG.
[016] The CORESET control channel element (CCE) -to-REG mapping type can be configured as a mapping type interspersed between a localized mapping type and the mapping type
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6/54 interleaved.
[017] The interleaving for the CCE-to-REG mapping can be performed in a unit of a REG cluster using a REG cluster index.
[018] A supported cluster size can be differently determined according to the type of CCE-to-REG mapping.
[019] Cluster information can include at least one of the intra-CCE cluster size information for the REG cluster belonging to the same control channel element (CCE) and inter-CCE cluster size information for the cluster of REGs belonging to different control channel elements (CCEs). When cluster information includes inter-CCE cluster size information, the UE can perform blind detection for the PDCCH by assuming the same pre-coding for REGs from different CCEs belonging to the same inter-CCE cluster.
[020] When the grouping information indicates the first value, the UE can perform the grouping of REG by time domain and, when the grouping information indicates the second value, the UE can perform the grouping of REG by time domain- frequency.
[021] The number of the plurality of OFDM symbols for configuring CORESET can be 2 or 3.
[022] The UE can perform demodulation for the PDCCH assuming that the same pre-coding is applied to reference signals received through REGs belonging to the same REG grouping.
ADVANTAGEOUS EFFECTS [023] According to one embodiment of the present invention, user equipment (UE) performs grouping by time domain or grouping by time-frequency domain according to the indication of a network
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7/54 and assumes the same pre-coding with respect to a plurality of resource element groups (REGs) belonging to a grouping of 1 REG and thus the detection for a physical downlink control channel (PDCCH) carrying control information downlink (DCI) can be performed more accurately and effectively.
[024] It will be appreciated by persons skilled in the art that the effects that can be achieved with the present invention are not limited to what was particularly described above and other advantages of the present invention will be more clearly understood from the detailed description below considered together with the attached drawings.
DESCRIPTION OF THE DRAWINGS [025] Figure 1 illustrates physical channels used in an LTE / LTE-A 3GPP system and a general method of signal transmission using the physical channels.
[026] Figure 2 illustrates an NR control region according to an embodiment of the present invention.
[027] Figure 3 illustrates grouping by frequency domain according to an embodiment of the present invention.
[028] Figure 4 illustrates a type of grouping by time domain according to an embodiment of the present invention.
[029] Figure 5 illustrates the grouping channel estimation performance by time domain according to an embodiment of the present invention.
[030] Figure 6 illustrates grouping options according to an embodiment of the present invention.
[031] Figure 7 illustrates a CORESET and a sub-CORESET according to an embodiment of the present invention.
[032] Figure 8 is a diagram for explaining resource indexing according to an embodiment of the present invention.
[033] Figure 9 is a diagram for explaining an indication method
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8/54 of the same pre-coding standard according to an embodiment of the present invention.
[034] Figure 10 illustrates RS patterns for adjusting RS patterns for adjusting RS density according to an embodiment of the present invention.
[035] Figure 11 illustrates the case in which CORESETs with different durations of CORESET overlap each other according to one embodiment of the present invention.
[036] Figure 12 illustrates a flow of a method of transmitting and receiving downlink control information (DCI) according to an embodiment of the present invention.
[037] Figure 13 illustrates a base station (BS) and user equipment (UE) according to an embodiment of the present invention.
MODE FOR CARRYING OUT THE INVENTION [038] The following description of modalities of the present invention can apply to various wireless access systems including CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA ( time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access) and the like. CDMA can be implemented with radio technology such as UTRA (universal terrestrial radio access), CDMA 2000 and the like. TDMA can be implemented with radio technology such as GSM / GPRS / EDGE (Global System for Mobile Communications) / General Packet Radio Service / Enhanced Data Rates for GSM Evolution). OFDMA can be implemented with radio technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, E-UTRA (UTRA Evolved) etc. UTRA is a part of UMTS (Universal Mobile Telecommunications System). LTE (long-term evolution) 3GPP (3- Generation Partnership Project) is a part of E-UMTS (Evolved UMTS) that uses
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E-UTRA. LTE 3GPP adopts OFDMA in downlink and adopts SC-FDMA in uplink. LTE-A (LTE-Advanced) is an evolved version of LTE 3GPP.
[039] For the sake of clarity, the following description mainly refers to the LTE 3GPP system or LTE 3GPP-A system, whereby the technical idea of the present invention may be not limited. Specific terminologies used in the following description are provided to help understand the present invention and the use of the terminologies can be modified to a different form within the scope of the technical idea of the present invention.
[040] Many communication devices required capacity for the highest communication capacity and therefore there was a need for enhanced mobile broadband communication (eMBB) compared to legacy radio access technology (RAT) in a communication system. next generation recently discussed. In addition, massive machine-type communications (mMTC) to connect a plurality of devices and objects to provide various services anytime and anywhere are also factors to be considered in next generation communication. In addition, considering a service / UE that is sensitive to reliability and latency, ultra-reliable, low-latency communication (URLLC) has been discussed for a next generation communication system.
[041] Thus, a new RAT that considers eMBB, mMTC, URLCC and so on has been discussed for next generation wireless communication.
[042] Some LTE / LTE-A configurations and operations that are not at odds with the Nova RAT project can also be applied to the new RAT. For convenience, the new RAT can be referred to as 5G mobile communication.
FRAMEWORK STRUCTURE NR AND PHYSICAL RESOURCE [043] In an NR system, downlink (DL) and downlink (UL) transmissions can be performed through frames lasting 10 ms and each frame can include 10 subframes. Therefore, 1 subframe can correspond to 1 ms. Each
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10/54 frame can be divided into two half frames.
[044] 1 subframe can include Nsymb ⁵¹ ^ ¹⁷¹ ® ' ¹ ^ Nsymb ^slot X NSiot ^subframe ' ^{| J} contiguous OFDM symbols. Nsymb ^slot represents the number of symbols per slot (μ), μ represents OFDM numerology, and NSiot ^subframe ' ^{| J} represents the number of intervals per subframe with reference to the corresponding μ. In NR, multiple OFDM numerologies shown in Table 1 below can be supported.
OK beautiful 1μ Δ / = 2 ^μ · 15 [kHz] Cyclic prefix 0 15 Normal 1 30 Normal 2 60 Normal, Extended 3 120 Normal 4 240 Normal
[045] In Table 1 above, Af refers to subcarrier spacing (SOS), μ and cyclic prefix with respect to a width part (BWP) of carrier band DL and μ and cyclic prefix with respect to a BWP of UL carrier can be configured for a UE through UL signaling.
[046] Table 2 below shows the number of N _sy mb symbol ^slots per slot, the NSiot ^frame number ^{, J} of symbols per frame, and the NSiot ^subframe number ' ^{| J} of slots per subframe with respect to each SCS in the case of normal CP.
Table 2
μ Nsymb ^slot Ns | ot ^frame -M _{Ns | ot} subframe, p 0 14 10 1 1 14 20 2
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2 14 40 4 3 14 80 8 4 14 160 16 5 14 320 32
[047] Table 3 below shows the number N _sy mb symbol ^slot per interval, the number Nsiot ^{frame ,, J} of intervals per frame, and the number N _S iot ^subfram ® ' ^{| J} of intervals per subframe with respect to each SCS in the case of extended CP.
Table 3
μ Nsymb ^s ' ^ot Nsiot ^ ’H _{Ns | ot} subframe, p 2 12 40 4
[048] Thus, in an NR system, the number of intervals included in 1 subframe can be changed according to the subcarrier spacing (SCS). The OFDM symbols included in each range can correspond to any of D (DL), U (UL) and X (flexible). DL transmission can be performed on a D or X symbol and UL transmission can be performed on a U or X symbol. A Flexible resource (for example, symbol X) can also be referred to as a Reserved resource, Another resource or a Unknown resource.
[049] In NR, a resource block (RB) can correspond to 12 subcarriers in the frequency domain. An RB can include a plurality of OFDM symbols. A resource element (RE) can correspond to 1 subcarrier and 1 OFDM symbol. Therefore, 12 REs can be present in 1 OFDM symbol in 1 RB.
[050] A carrier BWP can be defined as a set of contiguous physical resource blocks (PRBs). The BWP carrier can also be
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12/54 simply referred to as a BWP. A maximum of 4 BWPs can be configured for each of the UL / DL links in 1 UE. Even if multiple BWPs are configured, 1 BWP can be activated for a specified period of time. However, when a supplemental uplink (SOUTH) is configured on a UE, 4 BWPs can be additionally configured for the SOUTH and 1 BWP can be activated for a certain period of time. A UE may not be expected to receive a PDSCH, a PDCCH, a channel state information reference signal (CSI-RS), or a tracking reference signal (TRS) outside the activated BWP DL. In addition, the UE may not be expected to receive a PUSCH or a PUCCH out of the activated BWP UL.
CONTROL CHANNEL NR DL [051] In an NR system, an NR transmission system, a transmission unit of a control channel can be defined as a resource element group (REG) and / or a control channel element (CCE) etc. The CCE may refer to a minimum unit for transmitting the control channel. That is, a minimum PDCCH size can correspond to 1 CCE. When an aggregation level is equal to or greater than 2, a network can group a plurality of CCEs to transmit a PDCCH (i.e., CCE aggregation).
[052] A REG can correspond to 1 OFDM symbol in the time domain and can correspond to 1 PRB in the frequency domain. In addition, 1 CCE can correspond to 6 REGs.
[053] A set of control resources (CORESET) and a research space (SS) are now briefly described. CORESET can be a set of resources for transmission of control signal and the research space can be aggregation of control channel candidates to perform blind detection. The search space can be configured for CORESET. For example, when a search space is defined in a CORESET, a CORESET for a search space
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13/54 common search (CSS) and a CORESET for a specific UE search space (USS) can each be configured. As another example, a plurality of search spaces can be defined in a CORESET. For example, CSS and USS can be configured for the same CORESET. In the following example, the CSS can refer to a CORESET with a CSS configured for it and the USS can refer to a CORESET with a USS configured for it, or the like.
[054] An eNB can signal information in a CORESET to an UE. For example, a CORESET setting for each CORESET can be flagged for the UE, and the CORESET setting can be flagged over time (for example, symbol 1/2/3) etc. corresponding CORESET. The information included in the CORESET configuration is described below in detail.
GROUPING FOR NR-PDCCH [055] Before describing resource grouping in an NR system, physical resource block grouping (PRB) in an inherited LTE system is briefly described. When a DMRS with density less than a cell-specific RS (CRS) is used in an LTE system, an available resource is high for data transmission but, as the number of RSs available for channel estimation is high, the performance of channel estimate can be degraded. Thus, to minimize the degradation of channel estimation performance during the use of DMRS, grouping of PRB is introduced in an LTE system. For example, to ensure channel estimation performance in a transmission mode in which a DMRS is used, sections in which the same pre-coding is applied can be defined as a grouping of PRB and, in the corresponding sections, a UE can perform channel estimation using RSs belonging to different PRBs. For example, DMRS 2 mapped to PRB 2 as well as DMRS 1 mapped to PRB 1 can be used for demodulation channel estimation of data mapped to PRB 1. For valid channel estimation in units of
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14/54 PRB groupings, the same pre-coding needs to be applied to DMRS 1 and DMRS2.
[056] To increase the flexibility of the NR system, reduction in the use of a common RS was discussed. The common RS can be an RS transmitted normally by cell and can refer to an RS always active that cannot be specifically turned on / off by the UE. For example, a cell-specific RS (CRS) of an LTE system can be an example of the common RS.
[057] A project to reduce the common RS is also applied to an NR control channel (eg PDCCH) and therefore it may be desirable to group together different control channel resources to improve channel estimation performance control channel.
[058] From now on, it is assumed that 1 REG = 1 PRB & 1 OFDM symbol, and 1 CCE = 6 REGs, but the present invention is not limited to them and the present invention can also be applied to the case where several units of resource, for example, REG, CCE and PDCCH candidates are configured using different methods. As another example of defining a REG, 1 REG can correspond to 12 contiguous resource elements (REs) in the frequency domain and the number of REs used for transmitting control information can be changed considering whether an RS is included in the corresponding REG and / or if a reserved resource is present.
[059] Hereafter, the RS may include an RS for demodulation of a control channel, an RS for positioning, CSI-RS for CSI feedback, an interference measurement (IMR) feature, a cell-specific tracking RS ( for example, phase tracking), a radio link monitoring RS (RLM) and / or radio resource management RS (RRM) etc. and, for convenience of description, the present invention is mainly described in terms of an RS for demodulation of a control channel.
[060] Figure 2 illustrates an NR control region according to a
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15/54 embodiment of the present invention.
[061] A CORESET can correspond to a region in which REG / CCE indexing is performed. 1 UE can be configured with one or more CORESETs in a network. When a plurality of CORESETs are set to 1 UE, the respective CORESETs can have different properties. For example, a CCE-to-REG mapping type, a PDCCH to CCE mapping type, and / or an RS configuration etc. for each CORESET they can be defined through upper layer signaling (for example, CORESET configuration).
[062] Although Figure 2 illustrates only the duration of CORESET in the time domain, an interval of a CORESET can also be configured in the frequency domain.
[063] The grouping of a REG level can be applied to an NR control channel. When the grouping of a REG level is applied, the same pre-coding can be applied to different REGs belonging to the same grouping.
[064] When different REGs belonging to the same grouping belong to 1 CCE, that REG grouping can be defined as an intra-CCE REG grouping. When different REGs belonging to the same grouping belong to different CCEs, such a REG grouping can be defined as inter-CCE grouping.
[065] From now on, a method is proposed to perform the grouping in an NR control channel. In the following examples, it is assumed that 1 CCE = 6 REGs, but the present invention can also be applied to the case where the number of REGs per CCE can be defined differently.
[066] REG grouping in an NR control channel can be defined in the frequency domain and / or the time domain. An operational method etc. of a UE and an eNB for grouping in each domain is described below.
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GROUPING IN THE FREQUENCY DOMAIN [067] In terms of a network, the frequency domain REG grouping can apply the same pre-coding to different REGs in the same time instance. A UE can perform channel estimation using RSs in different REGs belonging to the same cluster, thereby improving the performance of the channel estimate.
[068] Figure 3 illustrates an example of frequency domain grouping.
[069] R refers to an RE in which a reference signal is transmitted, D refers to an ER in which control information is transmitted, and X refers to an RE in which an RS from another port antenna is transmitted.
[070] When a cluster size is 1 REG (that is, when the REG cluster is not applied), the channel estimate for each RE where control information is transmitted can be performed using an RS in a REG corresponding. When a cluster size is 2 REGs, the channel estimate for each RE where the control information is transmitted can be performed using all the RSs present in the cluster size.
[071] Thus, when a cluster size is greater than 1 REG, a UE can perform the channel estimate using the largest possible number of RS (s) to improve the performance of the channel estimate.
[072] In the case of grouping by frequency domain, it may be desirable to configure a grouping size differently according to a resource mapping type of a CORESET in which the grouping is performed. For example, when a CCE-to-REG mapping method induced through a CORESET configuration is distributed mapping (for example, interleaving), a cluster size can be determined by considering both the channel estimation performance and the gain of frequency diversity.
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When the frequency diversity gain determines the overall performance compared to the channel estimation performance, it may be desirable not to perform the grouping to improve the channel estimation performance or to keep a cluster size at a small value (e.g. 2 REGs). On the other hand, when channel estimation performance is more important than acquiring frequency diversity gain, it may be desirable to set the cluster size to a large value (for example, 3 REGs) to increase the estimation performance of channel.
[073] Thus, to adaptively match multiple channel environments, a network can configure a cluster size for each specific resource region (for example, CORESET). For example, a REG grouping size for each CORESET can be indicated for a UE through upper layer signaling (for example, CORESET configuration) etc.
[074] In the case of localized mapping, it may be desirable to support a large cluster size (for example, maximum REG cluster size). The cluster size of the localized mapping can be more widely configured than a cluster size of the distributed mapping.
[075] The use of localized mapping may mean that a network applies appropriate pre-coding to a UE due to relatively accurate channel information between the network and the UE. In this case, the network can implement all REGs by configuring a CCE to be adjacent to each other in the frequency domain and the same pre-coding can be applied to the REGs. For example, in the case of non-interleaved (ie localized) CCE-to-REG mapping, 1 CCE can correspond to a grouping of REG. In other words, a REG cluster size can also be set to 1 CCE (that is, 6 REGs) during localized mapping.
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18/54 [076] According to one embodiment of the present invention, the signaling of different grouping sizes according to a type of resource mapping (ie, type of REG-to-CCE mapping) by a network with respect to a grouping by frequency domain is proposed. A supported cluster size can be determined according to a REG-to-CCE mapping type. For example, in localized mapping, a REG cluster size can be set to 6-REG and, in distributed mapping (for example, collation), a network can configure a REG cluster size for a UE through layer signaling. (for example, CORESET configuration).
[077] Signaling different cluster sizes according to a type of resource mapping across a network can mean that a maximum value of a cluster size for each type of resource mapping (for example, distributed / localized mapping) is differently configured. For example, when the number of bits for signaling a cluster size is equalized in both distributed / localized mappings (for example, when the number of available cluster sizes is constant regardless of a resource mapping type), a grouping size indicated by a corresponding bit value can be differently defined according to a resource mapping method. For example, assuming a cluster size is indicated by 1 bit, 1 Bit = 0/1 can represent the cluster size = 2/3 REGs in the distributed mapping, and 1 Bit = 0/1 can represent the cluster size = 3/6 REGs in the localized mapping.
[078] Another grouping size can also be defined for inter-CCE grouping. For example, the cluster size mentioned above can refer to an intra-CCE cluster size, and a maximum cluster size can be additionally defined for inter-CCE clustering.
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19/54 separately from an intra-CCE cluster size. When REGs belonging to different CCEs are positioned adjacent to each other, a network can perform grouping by frequency domain in REGs positioned at a maximum cluster size. Thus, a maximum cluster size for the inter-CCE cluster can refer to a distance between REGs where the inter-CCE cluster is permissible. For example, the maximum cluster size can be defined in the frequency domain. For example, the maximum cluster size can be defined in the frequency domain and / or the time domain.
[079] A first cluster size for the intra-CCE cluster and a second cluster size for the inter-CCE cluster can be independently flagged. A network / UE can perform REG indexing / CCE indexing etc. based on a first cluster size or similar in the intra-CCE cluster and can perform inter-CCE clustering on REGs belonging to different CCEs in the second cluster size after aggregation of CCE. The second grouping size for the inter-CCE grouping can be configured as a value to include a predetermined number of intra-CCE REG grouping (s). For example, the second cluster size can be determined as an integer multiple of the first cluster size. For example, when intra-CCE clustering is performed in 2-REG units (for example, first cluster size = 2-REG) and the second cluster size for inter-CCE clustering is configured as 4-REG, a UE can assume the same pre-coding with respect to 2 intra-CCE REG groupings (that is, total of 4 REGs) belonging to different CCEs and can perform channel estimation.
[080] Alternatively, the UE can assume that a PRB cluster size configured in a data region (for example, PDSCH) is also
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20/54 applied to a control channel. Such an assumption can be applied to both cases, in which the REGs present in a corresponding cluster size are contiguous or non-contiguous and can also be applied to intra-CCE and / or inter-CCE.
[081] For example, assuming 6-REG is mapped to 1 COE through localized mapping and 4-RB sets 1 cluster in the case of a PDSCH, the intra-CCE cluster size of REG or the inter-CCE cluster size can be set to 4. For example, assuming that 2 CCEs (for example, CCE # 0 and CCE # 1) for an aggregate level (AL) -2 candidate channel are contiguous in the frequency domain, the REG cluster can be carried out according to [first grouping: CCE 4-REG # 0] + [second grouping:
2-REG of CCE # 0 & 2-REG of CCE # 1] + [third grouping: 4-REG of CCE # 1].
[082] To apply a REG grouping in the frequency domain, it may be necessary to determine a threshold at which a REG grouping is started / closed. For example, as described in (i) to (v), a limit of a REG grouping can be determined. When methods of (i) or (iv) are used, it may be desirable to configure a PRB number or bandwidth configured for a UE as a multiple of a cluster size.
[083] (i) A cluster size can be applied from a lower frequency (for example, lower subcarrier) on a CORESET configured for a UE. For example, REG indexing and / or REG cluster indexing can be used for each CORESET, and when interleaving is used, interleaving can be performed in units of REG clusters. When a reserved resource is present in a cluster size or a PRB that is not allocated for a UE is present, an actual cluster size of the UE may be less than an indicated cluster size from a network.
[084] (ii) A grouping size can be applied from a
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21/54 lowest frequency in a specific UE bandwidth configured for the UE. When a reserved resource is present in a cluster size or a PRB that is not allocated to the UE is present, an actual cluster size of the UE may be less than an indicated cluster size from a network.
[085] (iii) A cluster size can be applied from a lower frequency across an entire system's bandwidth. When a reserved resource is present in a cluster size or a PRB that is not allocated to the UE is present, an actual cluster size of the UE may be less than an indicated cluster size from a network.
[086] (iv) The frequency domain to which a REG cluster should be applied can be separately configured and a cluster size can be applied from a lower frequency in the corresponding frequency domain. When a reserved resource is present in a cluster size or a PRB that is not allocated to the UE is present, an actual cluster size of the UE may be less than an indicated cluster size from a network.
[087] (v) The UE may consider a starting point of a candidate control channel as a position where the REG pooling is initiated. For example, a grouping size can be applied from a candidate's initial COE or REG. The UE can assume that the same pre-coding is applied to corresponding REGs when different REGs belonging to the same candidate are present in a cluster size. When REGs belonging to the candidate are distributed to different groups, the UE can consider a starting point for each group as a starting point for a grouping.
[088] When a pre-encoder cycle, in which the pre-encoding is cyclically altered for each specific resource unit, or the like, is used,
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22/54 the grouping can be carried out in the same resource unit as the resource unit in which the precoder cycle is applied. For example, assuming that 2 precoders are cyclically applied to contiguous REGs, even index REGs can be grouped and odd index REGs can be grouped. This can be understood as grouping at a REG group level (for example, even REG group / odd REG group). For example, REGs to which Pre-encoder 1 is applied may correspond to a first REG group grouping and REGs to which Pre-encoder 2 is applied may correspond to a second REG group grouping. In this case, even if the pre-encoder cycle is used, the UE can assume the same pre-coding with respect to the REGs belonging to the same grouping.
[089] When the REG grouping and the precoder cycle are used together, the REG grouping may not always be performed on contiguous REGs. For example, non-contiguous REGs can belong to the same grouping of REG. In this case, a UE may be allocated with a REG or RB cluster size of a network and one or more precoders may be present in the allocated REG / RB cluster size. The UE can be configured with the number of precoders in the REG / RB cluster size of a network. The number of pre-encoders in the REG / RB cluster size may differ according to a pre-encoder cycle configuration method.
[090] - Pre-encoder cycle configuration with REG / RB Grouping Size: for example, to perform a pre-encoder cycle at each RB / REG (for example, to change a pre-encoder in units of RB / REG) REGs), a network can set a cluster size to 1.
[091] - REG clustering configuration together with precoder cycle configuration: a network can allocate a clustering size of
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23/54
REG and the number of precoders to be used in each cluster to the UE. Assuming that a cycle of 2 pre-encoders in a cluster of 6-RB, the network can perform a pre-encoder cycle in units of 1 REG / RB and, in this case, 3 RBs can share the same pre-encoder.
GROUPING BY TIME DOMAIN [092] Similar to grouping by frequency domain, the same pre-coding can also be applied to REGs in a grouping size in the case of grouping by time domain.
[093] According to a method of applying the same pre-coding, grouping by time domain can be defined differently. According to an embodiment of the present invention, grouping by time domain can be defined as two types as follows and a network can signal a type of grouping by time domain to be used for each resource region (e.g., CORESET, sub-CORESET).
(1) TYPE OF GROUPING BY TIME DOMAIN 1: WHEN RS IS TRANSMITTED IN ALL REGS IN THE GROUPING [094] Type 1 clustering can be used to increase channel estimation performance. To increase the channel estimate, each of the REGs in the grouping size by time domain can include an RS. The density of the RS can be different for each REG. For example, the density of an RS mapped to a REG of a first OFDM symbol and the density of an RS mapped to a REG of a second OFDM symbol may be different.
[095] As one of the available operations of a UE with respect to the Type 1 cluster, channel estimation can be performed using all RSs in a cluster. For example, to obtain a channel coefficient for a specific data RE through channel estimation based on 2D minimum mean square error (MMSE), the UE can use all RSs in a cluster to which the RE
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24/54 specific data belongs. In this case, similar to frequency domain grouping, the UE can perform channel estimation using a plurality of RSs to increase channel estimation performance.
[096] As another operation of a UE that performs Type 1 clustering, the UE can perform the channel estimation for each REG, in which case it can use an average of channel estimation results from REGs in a cluster as an end result of channel estimation. In this case, when REGs in a cluster are present at a coherent time and channel variation is unlikely to occur, noise can be suppressed.
[097] (2) Grouping type by time domain 2: when RS is transmitted only in REG in the grouping (for example, front load REG RS) [098] Type 2 grouping can be used as a method of reducing overload of RS to acquire coding gain of control information. When Type 2 clustering is used, a network can transmit an RS only a few REGs of REGs in a cluster and can map control information to a RE position from which an RS is omitted in other REGs where an RS is not. transmitted, thus reducing a coding rate for the control information.
[099] In the Type 2 cluster, a UE can perform channel estimation in a REG where an RS is transmitted and can reuse a channel estimate result in relation to a REG in which an RS is not transmitted. Such reuse of the channel estimation result can be based on the definition of REG grouping to apply the same pre-coding to REGs in a grouping.
[0100] Figure 4 illustrates the types of grouping by time domain 1/2 according to an embodiment of the present invention. R refers to an RE in which an RS is transmitted and D refers to an RE in which control information is
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25/54 transmitted. RSs from the same antenna port can be mapped to all RS REs or RSs from different antenna ports can be multiplexed and mapped using an FDM / CDM method.
[0101] As described above, grouping of REG by time domain can be defined as Types 1/2 and a network can apply / signal different types of grouping by time domain for respective resource regions.
[0102] As another example, when a specific condition is met, the application of a specific type of grouping by time domain can also be predefined.
[0103] Figure 5 illustrates the grouping channel estimation performance by time domain according to an embodiment of the present invention. The channel estimation performance illustrated in Figure 5 is a result obtained under the assumption that distributed mapping is applied to an aggregate level 2 candidate and indicates performance when each type of time domain is applied to various transport block sizes (TBSs).
[0104] An encoding rate according to each type and each TBS in Figure 5 can be (Tipol, 36bits) = 0.1875, (Tipol, 76bits) = 0.3958, (Tipol, 100bits) = 0.5208, (Type2, 36bits) = 0.15, (Type2, 76bits) = 0.3167, and (Type2, 100bits) = 0.4167.
[0105] Comparing the experimental result depending on an encoding rate with respect to each case, it can be seen that, when an encoding rate is high, Type 2 time grouping is appropriate and, when an encoding rate is low, Type 1 time grouping is appropriate.
[0106] In other words, when a coding rate is low, it means that the channel estimation performance largely affects the overall performance and, when a coding rate is high, the coding gain largely affects the overall performance.
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26/54 [0107] Based on the experimental result, a configuration of different types of domain grouping depending on an encoding rate (for example, for each level of aggregation, for each DCI format, for each payload size and / or for each coding fee considering the reserved resource) can be proposed. For example, a specific encoding rate time grouping type can be defined. A type of grouping by time domain for each level of aggregation can be determined by a network or can be determined for each DCI format or payload size.
[0108] To increase the flexibility of the system, a network / UE can divide candidates into a resource region where grouping by time domain is applied to distribute candidates across types of time grouping. For example, when the UE needs to perform blind decoding on 4 AL-1,4 candidates, 2 AL-2 candidates, 2 AL-4 candidates, and 2 AL-8 candidates, the UE can perform blind decoding assuming Type 1 time grouping with respect to to one half of the candidates from each LA and Type 2 time pool compared to the other half of the candidates. For this UE operation, a network can indicate a candidate for whom Type 1 needs to be assumed and a candidate for whom Type 2 needs to be assumed in a resource region where grouping by time domain is performed, through top layer or similar signs.
[0109] When a candidate's aggregation level is configured differently for each resource region (for example, CORESET), a type of grouping by time domain of a corresponding resource region can be determined according to an aggregation level . For example, when CORESET 0 and CORESET 1 are configured for a UE, only one candidate for ALs 1 and 2 is present in CORESET 0, and only one candidate for ALs 4 and 8 is present in CORESET 1, the UE can perform blind decoding assuming Type 2 time domain grouping with respect to CORESET 0 and
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27/54 grouping by Type 1 time domain with respect to CORESET 1.
[0110] In addition, the type of time grouping can be determined depending on the speed of a UE. Type 1 time domain grouping is more robust for rapid channel change in time domain than Type 2 time domain grouping. Based on velocity, a Doppler frequency or similar to the UE, a type of grouping by time domain can also be determined. For this purpose, the UE may periodically (or not periodically) notify the network of speed, Doppler frequency or the like.
[0111] When REG grouping by time domain and REG grouping by frequency domain are applied simultaneously, an RS setting can be determined according to a type of REG grouping by time domain. When only the REG grouping by frequency domain is applied, the RS can be transmitted in all REGs or a REG in which the RS is transmitted can be determined by a network.
INTRA-CCE GROUP [0112] Intra-CCE grouping can refer to grouping of REGs included in 1 CCE and the grouping of REG by frequency domain and / or time mentioned above can be applied to the intra-CCE grouping.
[0113] For a specific resource region (for example, CORESET), the network may indicate, for a UE through upper layer signaling etc., one of all or some options (i) to (iii) below or one of all or some options (i) to (iii) below can be predefined. For example, the network can signal at least one of options (i) to (iii) to the UE through a CORESET configuration.
[0114] (i) If REG grouping by time domain is applied and / or grouping size: information indicating whether REG grouping by time domain is applied in a specific resource region and / or a size
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28/54 grouping can be transmitted via network signaling etc. or they can be predefined. Information indicating whether the REG grouping by time domain is applied can be replaced by flagging a cluster size.
[0115] (ii) Whether REG grouping by frequency domain is applied and / or cluster size: information indicating whether REG grouping by frequency domain is applied in a specific resource region and / or a cluster size can be applied transmitted via network signaling etc. or they can be predefined. Information indicating whether REG grouping by frequency domain is applied can be replaced by flagging a cluster size.
[0116] (iii) If grouping of REG by frequency domain and time is applied and / or grouping size: grouping of REG by time domain and REG grouping by frequency domain can be applied simultaneously. Information indicating whether grouping of REG by frequency and time domain are applied in a specific resource region can be transmitted via network signaling, etc. or they can be predefined. Information indicating whether the REG grouping by frequency and time domain is applied in the region can be replaced by flagging a cluster size for each domain.
[0117] A method of replacing the information indicating whether grouping of REG by frequency / time domain is applied with the signaling of a grouping size is now described in more detail. When a REG cluster size is equal to or greater than 2 REGs, it can be interpreted as a cluster of REG that must be applied. In this case, if the REG grouping to be applied corresponds to grouping by time domain, grouping by frequency domain or grouping by domain of
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29/54 time-frequency can be determined using a cluster size. For example, when a cluster size of 2 or more is configured in a specific resource region (for example, CORESET) with a duration of 1 symbol, it can be interpreted as REG grouping by frequency domain that must be applied. When a grouping size is 2 in a specific resource region (for example, CORESET) lasting 2 symbols, it can be interpreted as REG grouping by time domain that must be applied and, when a grouping size is equal to or greater than 3 (for example, cluster size = 6), can be interpreted as grouping of REG by time-frequency domain that must be applied. When a grouping size is 3 in a specific resource region (for example, CORESET) lasting 3 symbols, it can be interpreted as REG grouping by time domain that must be applied and, when a grouping size is equal to or greater than 4 (for example, cluster size = 6), can be interpreted as grouping of REG by time-frequency domain that must be applied.
[0118] More generally, assuming the CORESET duration of N-symbol (N being an integer equal to or greater than 2) and a cluster size of M-REG, in the case of N <M, the UE can determine that the grouping by time domain is applied to a corresponding CORESET and, in the case of N> M, the UE can determine which grouping by time-frequency domain is applied to the corresponding CORESET. When the CORESET duration is 1 symbol, the REG grouping can always refer to grouping by frequency domain and, in this case, a grouping size can also be interpreted as a grouping size by frequency domain.
[0119] Figure 6 is a diagram showing grouping options according to an embodiment of the present invention.
[0120] Referring to Figure 6, (a) frequency grouping and (b)
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30/54 time grouping illustrate the case where a grouping size is 3. (c) time-frequency grouping illustrates the case where a grouping size is 3 in the time domain and a grouping size is 2 in the domain frequency. Therefore, in the time-frequency cluster, 6 REGs can configure a REG cluster.
[0121] In the case of intra-CCE grouping, a grouping size can also be used as a basic unit of resource indexing. For example, when REG grouping by time domain is applied to a CORESET where distributed mapping is used, the CORESET duration (ie length (symbol number) of a CORESET in the time domain) can be replaced by a cluster size, and a cluster index can be used as a basic unit of distribution (or interleaving). For example, a grouping size of REG with the same size as the CORESET duration can be supported. In addition, interleaving can be performed on a unit in a REG cluster.
[0122] For example, when a specific CORESET is configured with a combination of 100 PRBs & 3 symbols and the REG grouping by time domain is applied to a specific CORESET, each PRB can be defined to configure a grouping. For example, three contiguous REGs in the time domain, which are positioned on the same frequency resource (that is, the same PRB) in the frequency domain, can correspond to a grouping of REG. In this case, a network can interleave a cluster index from 0 to 99 in a logical domain and can perform mapping in a physical domain.
[0123] This method can also be applied to the frequency domain in the same way. For example, when a cluster size for REG grouping by frequency domain is flagged for 2 REGs, a UE can assume that two contiguous REGs configure a cluster in the frequency domain and
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31/54 can determine resource mapping or the like when performing blind detection on a corresponding CORESET.
[0124] As described in the above modalities, a REG grouping size per time domain can be determined as a time domain duration divider of a resource region (for example, CORESET) in which the grouping is applied. For example, assuming four cases where the duration of a resource region to which grouping by time domain is applied is 1,2, 3 and 4, a combination of available time domain grouping sizes for each case can be (1), (1,2), (1,3) and (1,2, 4). In other words, in the case of resource region duration N = 1,2, 3 symbols, the REG grouping by time domain may not be applied (ie cluster size = 1), or when the REG grouping per time domain is applied, a cluster size of the same can be interpreted as configured to be the same as the duration N of a resource region.
[0125] It may be desirable to configure a cluster size as a resource region duration divider because, when the cluster size is not configured as a resource region duration divider, the possibility that different REGs use different resources frequency in 1 cluster needs to be avoided. For example, when grouping by time domain is applied to a specific CORESET, the grouping size = 2 REGs and the duration of a CORESET is 3 symbols, grouping 1 and grouping 3 between clusters configured in a CORESET are positioned in different PRBs and, thus, the grouping by time domain may not be able to be performed in relation to grouping 1 and grouping 3.
[0126] As another example of the present invention, in the case of distributed resource mapping, only one of REG grouping per domain of
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32/54 frequency / time can also be set to be applied. For example, it can be assumed that both REG groupings by frequency / time domain are applied to a CCE including 6 REGs, a cluster size by time domain is 3, and a cluster size by frequency domain is 2 In this case, to easily perform the distribution for acquiring frequency diversity, a network can only perform grouping of REG with respect to a domain.
[0127] In the case of localized resource mapping, the application of grouping both time / frequency domains or performing grouping in only one domain can be configured / predefined by a network. When both groupings by time / frequency domain are performed, a group in which both groupings in two domains are applied can also be used as a basic unit of resource indexing.
[0128] The resource region proposed above can be a CORESET or a sub-CORESET included in CORESET. The sub-CORESETs can be distinguished from each other.
[0129] Figure 7 illustrates a CORESET and a sub-CORESET according to an embodiment of the present invention.
[0130] In (b) of Figure 7, the REG grouping by time domain may not be applied and only the REG grouping by frequency domain can be applied to the sub-CORESETO. The grouping of REG by time domain of cluster size 2 can be applied to sub-CORESET1. Resource indexing can be independently performed for each subCORESET or can be performed on an entire CORESET, or a method for resource indexing can be indicated by a network through upper layer or similar signaling.
[0131] Figure 8 is a diagram for explaining resource indexing according to an embodiment of the present invention.
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33/54 [0132] Referring to Figure 8, (a) separate sub-CORESET indexing can easily configure different search spaces and (b) resource indexing (ie, combined indexing) with respect to an entire CORESET can be used as a method to simultaneously perform REG grouping by frequency / time domain. (a) separate indexing can also be used to distinguish between a search space for DCI that needs to be quickly decoded and a search space for DCI with low limitation on decoding time. Although Figure 8 illustrates the case where resource indexing is performed from a first symbol using a first frequency method for convenience, a resource index can also be changed by applying interleaving or the like.
[0133] Until now, although the grouping between contiguous REGs in the time / frequency domain has been mainly described, the grouping of REG by time / frequency can be defined by a grouping pattern. For example, when a grouping pattern is set to {2, 1,2, 1} for grouping REG by frequency domain, {REGO, REG1], {REG2}, {REG3, REG4], and {REG5} between 6 REGs configuring a CCE, each can configure a grouping of REG.
[0134] The grouping pattern can also be used in grouping REG by time domain. For example, when the duration of a resource region in which the REG grouping by time domain is applied is 3 symbols, a network may signal a grouping pattern of {2, 1}. A grouping pattern {2,1} can mean that 2 contiguous REGs configure grouping and a subsequent REG configures another grouping in the time domain. The Type 1/2 time grouping for each grouping included in the standard can be predefined or can be signaled by the method proposed above.
INTER-CCE GROUPING [0135] As in the intra-CCE grouping, in the case of inter-CCE grouping,
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34/54 can also be signaled by a network if grouping is applied and / or a grouping size. Proposals related to the REG level grouping mentioned above can also be applied to the CCE level grouping and, in the above proposals, a REG can be replaced by a CCE and inter-CCE grouping can be incorporated.
[0136] When inter-CCE grouping is incorporated using the method mentioned above, there may be additional limitations in a procedure, such as resource indexing. For example, assuming that inter-CCE grouping is always applied, an inter-CCE grouping size may have to be assumed and CCE indexing may have to be performed. For example, even if CCE indexes are contiguous, inter-CCE grouping may have to be performed on different CCEs with non-contiguous time / frequency positions and, thus, CCE indexing can be performed considering a cluster size.
[0137] Therefore, to apply inter-CCE grouping, a network can configure only if inter-CCE grouping is applied and a grouping size and, when inter-CCE grouping is applied, a UE can assume the same pre -coding to be applied when contiguous resources are present in the grouping size in the time / frequency domain.
[0138] A cluster size for the inter-CCE cluster can be independent of an intra-CCE cluster size. Alternatively, when a maximum grouping size for the inter-CCE grouping is defined separately and REGs belonging to different CCEs are adjacent to each other, the assumption of the same pre-coding in a maximum grouping size by a UE can be predefined or can be signaled by a network.
[0139] In addition, inter-CCE grouping in a CORESET to which interleaving is applied can be replaced by a setting of an interleaving unit size. To effectively configure a PDDCH structure
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35/54 hierarchical and / or to reduce the probability of blocking between CORESETs, the interleaving of a REG grouping set unit can be introduced. For example, a network can contiguously implement REGs belonging to each CCE by configuring a candidate with a high level of aggregation in a CORESET to which interleaving is applied and can interleave a set of REG grouping. When collation based on REG grouping set is performed and a size of a REG grouping set is configured (for each CORESET), a UE can assume that the size of the REG grouping set is the same as a size of grouping of inter-CCE REG.
[0140] For example, when REG {0, 1,2, 3, 4, 5} configures CCEO and REG {6, 7, 8, 9, 10, 11} configures CCE1 in 1 CORESET symbol where interleaving is performed , and CCEO and CCE1 configure a candidate with aggregation level 2, a network can pair a REG by configuring each CCE one by one and can perform interleaving. For example, REG {0, 6}, {1, 7}, {2, 8}, {3, 9}, {4, 10} and {5, 11} can be used in interleaving units.
BROADBAND REFERENCE SIGNAL [0141] To increase system flexibility in NR, a method of reducing a common RS and an operation in terms of an EU-specific demodulation reference signal (DMRS) was discussed. However, a broadband RS can be periodically transmitted for the purposes of channel estimation performance and measurement of a control channel, phase tracking etc. When broadband RS is used, the number of RSs to be used by a UE during channel estimation can be increased to increase channel estimation performance. In addition, the UE can perform broadband RS cell or beam level measurement to more efficiently perform a procedure, such as a cell change and a beam change.
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36/54 [0142] A spatial filtering method (beamforming) dedicated to an UE, a transmission diversity method or the like can be applied to an NR control channel to transmit control information, and a broadband RS can be most appropriate for the transmission diversity method. In the UE's dedicated spatial filtering method, pre-coding to maximize a receiving SNR depending on a channel situation for each UE can be applied and thus may be more appropriate for broadband operation. Therefore, the use of the transmission diversity method may be more appropriate in a resource region where broadband RS is applied.
[0143] In NR, a scheme, such as 2-port space frequency block coding (SFBC), 1-port RB level precoder cycle and 1-port stacked cyclic delay diversity (SCDD), can be used as the method of transmission diversity. The 1-port RB level pre-encoder cycle can perform excellently at a high AL and may unfavorably allow decoding using the same operation as a UE's dedicated space filtering in terms of a UE. However, to apply broadband RS to the 1-port RB level pre-encoder cycle scheme, additional signaling may be required.
[0144] A UE can assume that the same pre-encoder is used in a region where broadband RS is transmitted and thus can perform channel estimation using all RSs in the corresponding region and can perform the measurement, tracking or similar. On the other hand, the 1-port RB level pre-encoder cycle can be a method for acquiring beam diversity gain using different pre-encoders for RBs. Therefore, to simultaneously apply the precoder cycle scheme and the broadband RS, the following information elements need to be signaled. The following information elements can be indicated by layer signaling
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37/54 higher or similar or can be signaled in an initial access procedure. All or some of the following information elements can be flagged for a UE and, when only some of the following information elements, non-flagged information elements can be predefined.
[0145] (i) Broadband RS period [0146] A period with which a broadband RS is transmitted, a set of subframes or the like can be indicated to the UE through upper layer or similar signaling. The UE can perform control channel decoding based on the broadband RS at an interval in which the broadband RS is transmitted.
[0147] (ii) Broadband RS transmission region [0148] The time / frequency domain in an interval in which the broadband RS is transmitted can be signaled. The frequency domain of the broadband RS can be signaled in units of multiples of a minimum UE bandwidth (i.e., a minimum BW specified in NR) and a starting point or similar of the broadband RS can be additionally signaled. A symbol (or set of symbols) in which the broadband RS is transmitted can also be signaled as the time domain of the broadband RS.
[0149] As another method, a broadband RS transmission region can be signaled in units of CORESETs (or subCORESETs). For example, the transmission region of the broadband RS can be signaled using an addition method if the broadband RS is transmitted or similar to a CORESET configuration. For example, as shown in (b) of Figure 7, when a subCORESET is configured and a broadband RS is applied only to the subCORESETO, a precoder other than a subCORESETO precoder in which the broadband RS is transmitted can be applied to a REG (or REG grouping) of subCORESETI.
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38/54 [0150] (iii) The same broadband pre-coding standard [0151] As described above, when the 1-port RB level pre-encoder cycle is used, a pre-encoder can be changed for each RB or group of RB. Therefore, an eNB can signal a pattern of RB or similar to which the same pre-encoder is applied between regions where the broadband RS is transmitted. For example, a network can notify a UE about pre-encoding information in a resource region where broadband RS is applied.
[0152] Although Figure 9 below exemplifies a method of transmitting pre-coding information to a UE using a concept of a standard, a sub-pattern or the like, the present invention is not limited to it, and pre-coding information can be transmitted using various methods. To reduce signaling overhead or the like, at least some of the following pre-coding item information can be predefined. For example, a pattern related to pre-coding in a resource region where broadband RS is used can be predefined. For example, the pattern related to pre-coding can be defined using the following pattern and proposed sub-pattern etc.
[0153] Figure 9 is a diagram for explaining a method of indicating the same pre-coding standard according to an embodiment of the present invention. In Figure 9, the same number can refer to the application of the same pre-coding.
[0154] When the 1-port RB level pre-encoder cycle is used, a network can signal a pattern length, a sub-pattern length and the like to notify a UE about sections where the same pre-coding is applied . Here, the pattern can refer to a pre-encoder cycle period and the sub-pattern can refer to resource sections where the same pre-coding is applied.
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39/54 [0155] For example, in (a) of Figure 9, a network can signal a pattern length of 6 and a sub-pattern length of 2 for a UE. The UE can apply the standard and the sub-pattern to a section where broadband RS is applied to identify features to which the same pre-coding is applied and can perform channel estimation, measurement, tracking and so on based on corresponding resource.
[0156] (b) of Figure 9 illustrates another example of applying a broadband RS. As shown in (b) of Figure 9, when broadband RS is transmitted, it can be effective to perform the measurement for each section. When REG / REG clusters setting up a CCE or different CCEs setting up a candidate are distributed in different sub-patterns, a valid grouping size can be relatively high, thus gaining frequency diversity can be obtained and channel estimating performance can also be improved.
CONFIGURABLE RS DENSITY [0157] With respect to the RS mapping methods proposed in Figure 4, (a) Type 1 can be referred to as a fully loaded RS method, (b) Type 2 can be referred to as a loaded RS method frontally, and the frontally loaded RS method can advantageously ensure a lower coding rate for a control signal than the fully loaded RS method.
[0158] In addition, a method of reducing an encoding rate in the fully loaded RS method can be proposed. For example, to reduce an encoding rate, the density of RS can be adjusted based on channel estimation performance.
[0159] Figure 10 illustrates RS patterns for adjusting RS density according to an embodiment of the present invention. In Figure 10, an RS pattern (that is, an RE position where an RS is transmitted) can be changed. For example, an RS can be mapped as shown in Figure 4.
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40/54 [0160] Referring to Figure 10, RS density can be configured differently according to each RS standard. Therefore, the number of data REs for transmitting control information can also be configured differently according to each RS standard. All or some of the 3 RS standards can be defined for an NR control channel.
[0161] A network can configure a RS standard with relatively low density for a UE with an excellent channel environment or a UE (or a group of UE), the channel estimation performance of which is ensured. For example, an RS standard to be assumed by a UE in a corresponding CORESET for each CORESET can be configured. The UE can assume an RS standard in the corresponding CORESET according to an RS configuration for each CORESET.
[0162] An RS standard to be assumed by a UE in each CORESET can be determined in association with the duration of CORESET (without additional signaling). For example, when the configurable CORESET duration is 1, 2 and 3 symbols, a UE can assume that RS patterns are used in their respective durations. When the CORESET duration is 1, (a) RS 1/3 standard can be used, when the CORESET duration is 2, RS 1/4 standard can be used and, when the CORESET duration is 3, the use of RS 1/6 standard can be configured / preset.
[0163] The application of such an association between the duration of CORESET and an RS standard can be determined according to whether grouping by time domain is performed. For example, in the case of a CORESET to which the grouping by time domain (for example, a UE can assume that the same pre-coding is applied to REGs belonging to the same grouping in the time domain), a pattern of RS predetermined can be used according to the duration of CORESET. When grouping by time domain is not
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41/54 applied, only a specific RS pattern (for example, RS 1/3 pattern) can be preset to be used regardless of the length of CORESET. This is because, when time domain grouping is applied, channel estimation performance is improved compared to time domain grouping, and thus, even if the RS density per REG is reduced, the estimation performance channel is not largely degraded.
[0164] Through this method, additional coding gain can be obtained while the channel estimation performance is ensured. For example, when a low density RS standard is used, a similar effect for Type 2 in Figure 4 can be expected.
[0165] An RS standard to be assumed by a UE in each CORESET can be determined in association with a grouping option for each CORESET (without additional signaling). REG clustering may be possible with respect to NR-PDCCH in the time / frequency domain, and performance improvement can be expected through REG clustering in terms of channel estimation. Thus, when sufficient channel estimation performance is able to be obtained by grouping REG, it may be desirable to reduce the density of RS to gain gain in terms of an encoding rate.
[0166] Accordingly, according to an embodiment of the present invention, the density of RS can be determined in association with a total cluster size. For example, in the time / frequency domain, a grouping size can be represented according to (Time, Frequency) = (1.6), (2, 3), (3, 2), (2, 1), (3, 1) (where, in the case of 1 CORESET symbol, (1, 2) and (1, 3) are also possible) and, when the sum of grouping sizes of the time and frequency domains is equal to or greater than than 5, an RS standard corresponding to the RS density of 1/6 can be used. On the other hand, when the sum of cluster sizes in the time and frequency domains is less than 5, a pattern of RS
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42/54 corresponding to the 1/3 RS density can be applied.
[0167] As another example, when grouping by time domain is used for the purpose of reducing an encoding rate (for example, an RS is transmitted only to some of the REGs in the grouping by time domain), the density of RS can be determined based on a grouping size by frequency domain. For example, the frequency domain cluster size is greater than 2 REGs, an RS pattern corresponding to the 1/6 RS density can be used, and when the frequency domain cluster size is 1 or 2, an RS pattern corresponding to the 1/3 and 1/4 RS density can be used.
[0168] The configurable RS standard proposed above (or CORESET duration based RS standard) can improve efficiency in terms of channel estimation performance and an encoding rate, but an operating method for the case where CORESETs with different durations of CORESET overlap each other need to be defined.
[0169] Figure 11 illustrates the case where CORESETs with different durations of CORESET overlap each other according to one embodiment of the present invention.
[0170] Referring to Figure 11, CORESET 0 of duration 1 and CORESET 1 of duration 3 can partially overlap each other. It can be assumed that RS 1/3 pattern is used in CORESETO and grouping by time domain is applied and RS 1/6 pattern is used in CORESET1 (for example, a grouping size: 1 in the & 3 frequency domain in the time domain). In this case, an RS pattern is redundantly configured in Region 0 and thus, when the way in which RS patterns are processed in Region 0 is not defined, there may be a problem in which a UE incorrectly refers to a RS during blind decoding of the UE, as well as channel estimation or decoding performance is
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Degraded 43/54.
[0171] To overcome a problem that arises when RS patterns are configured to overlap with each other in the time / frequency domain due to the overlap between different CORESETs, the following methods (i) to (iv) are proposed. A specific option among the following options can be predefined to be used when CORESETs overlap with each other or can be configured for a UE over a network. In addition, the following options can also be applied when CORESETs overlap each other regardless of an RS pattern (for example, even when RS patterns of different CORESETs are the same).
[0172] (i) Option 1: Assumption of only corresponding CORESET RS standard [0173] For an NR-PDCCH, an EU-specific DMRS can basically be used. Therefore, a UE can assume only one RS standard from a corresponding CORESET while performing blind decoding on a candidate control channel that belongs to a specific CORESET. For an operation, such as Option 1, it can be assumed that a network does not transmit different PDCCHs to the same resource using the same portion of RS. For example, it can be assumed that an RS pattern configured in CORESET1 is always used in Regions 1 and 2 in Figure 11. The UE can assume that only one RS pattern of CORESETO is present while performing blind decoding on a CORESECT candidate in Region 0, you can assume that only one RS pattern of CORESET1 is present while performing blind decoding on a CORESET1 candidate in Region 0, and can perform blind decoding.
[0174] (ii) Option 2: Change in RS standard [0175] When a plurality of CORESETs are configured for a UE and a section where the CORESETs overlap each other in the domain of
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44/54 time / frequency is present, a RS pattern of a specific CORESET can be changed in all CORESETs or a section in which the CORESETs overlap each other. For this purpose, a network can configure RS pattern information (for example, v-shift information indicating frequency shift) from a corresponding CORESET together while configuring a CORESET.
[0176] Alternatively, a UE can assume that a RS pattern of a specific CORESET is changed to a predefined pattern when CORESETs overlap with each other without signaling a network.
[0177] For this purpose, the priority between CORESETs can be defined and an RS standard of a CORESET with low priority can be changed. A high priority CORESET can be, for example, a CORESET in which an RS (for example, broadband RS) is transmitted regardless of whether a PDCCH is transmitted and a UE can assume that an RS standard of such CORESET is not changed.
[0178] When an RS pattern is changed to a predefined pattern, the predefined pattern can be set using, for example, an offset value in v (for example, an RS position is moved by an offset value in v in the frequency domain).
[0179] (iii) Option 3: rate matching of different CORESETs [0180] It can be assumed that an RS (for example, broadband RS), transmitted regardless of whether a PDCCH is transmitted, is transmitted in a specific CORESET (or specific time / frequency domain) and that another CORESET that overlaps the corresponding CORESET is configured. In this case, a UE can assume that RS pattern positions of different CORESETs have rate matching in the mapping of control information when performing blind decoding on each CORESET.
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45/54 [0181] In this case, since the control information has a rate match with respect to an RS pattern position, an encoding rate of the control information may be high and, as a result, the decoding performance of the UE can be degraded. When RS patterns are redundantly configured on the same time / frequency resource, an RS may not be used frequently in a corresponding region. For example, when RS 1/3 standard and RS 1/6 standard in Figure 10 are used in different CORESETs, respectively, RS REs according to the RS 1/6 standard can be redundantly configured as RS REs according to the standard 1/3.
[0182] To overcome this problem, when Option 3 is used, an RS standard needs to be determined so that RS RE positions are not redundant between RS standards. To prevent an RE in which an RS is transmitted from being redundant, the method of changing an RS standard configured in Option 2 can also be used.
[0183] (iv) Option 4: use of CORESET RS standard with high priority [0184] When an RS (eg broadband RS) transmitted regardless of whether a PDCCH is transmitted on a specific CORESET (or domain of specific time / frequency) and another CORESET that overlaps the corresponding CORESET is configured, a UE can only assume a RS pattern of a CORESET with high priority in a section (for example, region 0 in Figure 11) where CORESETs overlap each other when performing blind decoding on each CORESET. For example, the UE may assume that an RS standard defined in a CORESET with a low priority is not used in a section where CORESETs overlap with each other.
[0185] The priority of CORESETs can be configured by a network or can be predefined. When the priority of CORESETs is predefined, a high priority can be assigned to a CORESET including a search space
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46/54 common, a CORESET in which a broadband RS (for example, RSs that are transmitted over a period of time in a predetermined region regardless of whether a PDCCH is transmitted) is transmitted or the like.
[0186] When a CORESET in which a broadband RS is transmitted and a CORESET in which a DMRS is transmitted totally or partially overlap (for example, when a broadband RS is used in CORESET 0 and a DMRS is used in CORESET1 in Figure 11) and Option 3 or Option 4 is used, even if grouping by time domain is applied to CORESET1, a UE can separately perform the channel estimate for each RegionO and Region. For example, the UE can apply the channel estimate result using the broadband RS to a corresponding REG in Region 0 and can apply the channel estimate result using DMRS to the corresponding REG in Region 1. In this case, the UE can assume that time domain grouping is applied only to the Region. A grouping size by time domain in a region where CORESETs overlap with each other can be interpreted as different from a grouping size of a corresponding CORESET. The grouping by time domain can be determined according to the configuration of a CORESET in Region 2.
[0187] Figure 12 illustrates a flow of a method of transmitting and receiving downlink control information (DCI) according to an embodiment of the present invention. Figure 12 illustrates an example of the methods mentioned above and the present invention is not limited to Figure 12 and, therefore, a repeated description of the above description may not be provided here.
[0188] Referring to Figure 12, an eNB can transmit grouping information into groups of resource elements (REGs) through upper layer signaling (1205). Each REG can correspond to 1 resource block (RB) and 1 orthogonal frequency division (OFDM) multiplexing symbol. ENB can
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47/54 transmit grouping information by signaling the upper layer of a CORESET configuration.
[0189] One or more CORESETs can be configured in a UE. For example, an eNB can transmit one or more or more CORESETs configuration to a UE to configure one or more CORESETs. Grouping information and a type of control channel element mapping (CCE) -to-REG can be entered (for example, entered via a CORESET configuration) for each CORESET. Cluster information can include cluster size information indicating the number of REGs included in a cluster of 1 REG. The CCE-to-REG mapping type of a CORESET can indicate one of a localized mapping type (for example, non-interleaved mapping) and an interleaved mapping type.
[0190] From now on, for convenience of description, it is assumed that a type of CCE-to-REG mapping of a CORESET is configured as a type of interleaving mapping. In addition, it can be assumed that a CORESET is configured in a plurality of OFDM symbols. For example, the number of a plurality of OFDM symbols for configuring a CORESET can be 2 or 3.
[0191] eNB can generate DL control information (DCI) (1210).
[0192] The eNB can transmit the DCI generated through a PDCCH (1215).
[0193] When the grouping information indicates a first value, eNB can perform the grouping so that only REGs located in the same RB and corresponding to different OFDM symbols in CORESET are grouped as a grouping of 1 REG. When the grouping information indicates a second value, eNB can perform the grouping so that the REGs located in the same RB and corresponding to the different OFDM symbols are grouped as a grouping of 1 REG together with REGs located in different RBs in CORESET. ENB can transmit DCI by applying the same pre-coding to
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48/54
REGs belonging to the same REG group as a result of the REG group.
[0194] The UE can perform blind detection for a physical downlink control channel (PDCCH) in a set of control resources (CORESET) configured in a plurality of OFDM symbols (1220).
[0195] The UE can acquire DL control information (DCI) from the blindly detected PDCCH (1225). When the grouping information indicates a first value, the UE can perform the grouping so that only REGs located in the same RB and corresponding to different OFDM symbols in CORESET are grouped as a grouping of 1 REG. When the grouping information indicates a second value, the UE can perform the grouping so that the REGs located in the same RB and corresponding to the different OFDM symbols are grouped as a grouping of 1 REG together with REGs located in different RBs in CORESET. For example, when the grouping information indicates the first value, the UE can perform the grouping of REG by time domain and, when the grouping information indicates the second value, the UE can perform the grouping of REG by time domain- frequency.
[0196] The UE can perform blind detection for the PDCCH assuming the same pre-coding for REGs that belong to the same REG cluster as a result of the REG cluster. For example, the UE can perform demodulation for the PDCCH assuming that the same pre-coding is applied to RSs received through REGs belonging to the same REG group.
[0197] When the grouping information indicates the first value, the grouping size of 1 REG can be configured to be the same as the number of the plurality of OFDM symbols to configure a CORESET.
[0198] When the grouping information indicates the second value, the
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49/54 1 REG cluster size can be configured to be the same as the number of REGs included in 1 control channel element (CCE).
[0199] Merge for the CCE-to-REG mapping can be performed on a unit of a REG cluster using a REG cluster index.
[0200] The supported cluster size can be determined according to a CCE-to-REG mapping type.
[0201] For example, cluster information may include at least one of the intra-CCE cluster size information for the REG cluster belonging to the same control channel element (CCE) and inter-CCE cluster size information for the grouping of REGs belonging to different control channel elements (CCEs). When the cluster information includes the inter-CCE cluster size information, the UE can perform blind detection for the PDCCH assuming the same pre-coding with respect to REGs of different CCEs belonging to the same inter-CCE cluster.
[0202] Figure 13 is a block diagram illustrating a structure of a base station (BS) 105 and an UE 110 in a wireless communication system 100 according to an embodiment of the present invention. The structure of BS 105 and UE 110 of Figure 13 are merely an embodiment of a BS and a UE for implementing the method mentioned above, and the structure of a BS and a UE according to the present invention is not limited to Figure 13. BS 105 can also be referred to as an eNB or a gNB. UE 110 can also be referred to as a user terminal.
[0203] Although a BS 105 and UE 110 are illustrated to simplify wireless communication system 100, wireless communication system 100 may include one or more BSs and / or one or more UEs.
[0204] BS 105 may include a transmission data processor (Tx)
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50/54
115, a symbol modulator 120, a transmitter 125, a transmit / receive antenna 130, a processor 180, a memory 185, a receiver 190, a symbol demodulator 195 and a receive data processor (Rx) 197. The UE 110 may include a Tx 165 data processor, a symbol modulator 170, a transmitter 175, a transmit / receive antenna 135, a processor 155, a memory 160, a receiver 140, a symbol demodulator 155, and a processor of data Rx 150. In FIG. 12, although an antenna 130 is used for BS 105 and an antenna 135 is used for UE 110, each of BS 105 and UE 110 may also include a plurality of antennas as needed. Therefore, BS 105 and UE 110, according to the present invention, support a MIMO system (Multiple Inputs Multiple Outputs). BS 105, according to the present invention, can support both a Single User MIMO scheme (SU-MIMO) and a Multiple User MIMO scheme (MU-MIMO).
[0205] In downlink, the Tx 115 data processor receives traffic data, formats the received traffic data, encodes the formatted traffic data, merges the encoded traffic data and modulates the merged data (or performs mapping of symbols in the data interleaved) to provide modulation symbols (ie data symbols). The symbol modulator 120 receives and processes the data symbols and the pilot symbols in order to provide a flow of symbols.
[0206] Symbol modulator 120 multiplexes data and pilot symbols, and transmits multiplexed data and pilot symbols to transmitter 125. In this case, each transmission symbol (Tx) can be a data symbol, a pilot symbol or a value of a zero sign (null sign). In each symbol period, the pilot symbols can be transmitted successively during each symbol period. The pilot symbols can be an FDM symbol, an OFDM symbol, a Time Division Multiplexing (TDM) symbol or a Multiplexing symbol
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51/54
Code Division (CDM).
[0207] Transmitter 125 receives a stream of symbols, converts received symbols into one or more analog signals, and additionally adjusts one or more analog signals (for example, amplification, filtering and upward conversion of analog signals), from so that it generates an appropriate downlink signal for data transmission over an RF channel. Subsequently, the downlink signal is transmitted to the UE via antenna 130.
[0208] The configuration of the UE 110 will be described in detail below. Antenna 135 of UE 110 receives a DL signal from BS 105 and transmits the DL signal to receiver 140. Receiver 140 performs the adjustment (for example, filtering, amplification and downward frequency conversion) of the received DL signal, and digitizes the signal adjusted to obtain samples. The symbol demodulator 145 demodulates the received pilot symbols and provides the demodulated result to processor 155 to perform channel estimation.
[0209] Symbol demodulator 145 receives a frequency response estimate value for downlink from processor 155, demodulates received data symbols, obtains data symbol estimate values (indicating estimated values of transmitted data symbols) and provides the data symbol estimate values for the Rx 150 data processor. The Rx 150 data processor performs demodulation (ie symbol demapping) of data symbol estimate values, deinterleaves the demodulated result, decodes the result deinterleaved and retrieves the transmitted traffic data.
[0210] The processing of the symbol demodulator 145 and the data processor Rx 150 is complementary to that of the symbol modulator 120 and the data processor Tx 115 in BS 205.
[0211] The UE 110's Tx 165 data processor processes uplink traffic data and provides data symbols. The symbol modulator 170 receives and
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52/54 multiplexes data symbols and modulates multiplexed data symbols so that it can supply a stream of symbols to transmitter 175. Transmitter 175 obtains and processes the stream of symbols to generate an uplink (UL) signal and signal UL is transmitted to BS 105 via antenna 135. The UE / BS transmitter and receiver can be implemented as a single radio frequency (RF) unit.
[0212] BS 105 receives the UL signal from UE 110 through antenna 130. The receiver processes the received UL signal to obtain samples. Subsequently, the symbol demodulator 195 processes the symbols and provides pilot symbols and estimate values for data symbols received via uplink. The Rx 197 data processor processes the estimate value of data symbols and retrieves the traffic data received from the UE 110.
[0213] A 155 or 180 processor from UE 110 or BS 105 controls or indicates UE 110 or BS 105 operations. For example, processor 155 or 180 from UE 110 or BS 105 controls, adjusts and manages UE 210 operations. or BS 105. Each processor 155 or 180 can be connected to a memory unit 160 or 185 to store data and program code. The 160 or 185 memory is connected to the 155 or 180 processor, in order to store the operating system, applications and files in general.
[0214] Processor 155 or 180 can also be referred to as a controller, a microcontroller, a microprocessor, a microcomputer, etc. However, the 155 or 180 processor can be implemented by various means, for example, hardware, firmware, software or a combination thereof. In a hardware configuration, methods according to the modalities of the present invention can be implemented by processor 155 or 180, for example, one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing (DSPDs), programmable logic devices (PLDs), field programmable port arrays (FPGAs),
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53/54 processors, controllers, microcontrollers, microprocessors etc.
[0215] In a firmware or software configuration, the methods according to the modalities of the present invention can be implemented in the form of modules, procedures, functions etc., which perform the functions or operations described above. The firmware or software implemented in the present invention can be contained in processor 155 or 180 or in memory unit 160 or 185, in such a way that it can be driven by processor 155 or 180.
[0216] The radio interface protocol layers between the UE 110, BS 105 and a wireless communication system (ie network) can be classified into a first layer (L1 layer), a second layer (L2 layer) ) and a third layer (L3 layer) based on the bottom three layers of the Open System Interconnection (OSI) reference model widely known in communication systems. A physical layer belonging to the first layer (L1) provides an information transfer service through a physical channel. A Radio Resource Control (RRC) layer belonging to the third layer (L3) controls the radio resources between the UE and the network. The UE 110 and BS 105 can exchange RRC messages with each other via the wireless communication network and the RRC layer.
[0217] The above mentioned modalities correspond to combinations of elements and characteristics of the present invention in the prescribed forms. And it is possible to consider that the respective elements or resources are selective, unless they are explicitly mentioned. Each of the elements or resources can be implemented in a way that cannot be combined with other elements or resources. Furthermore, it is capable of implementing a modality of the present invention by combining elements and / or resources together. A sequence of operations explained for each embodiment of the present invention can be modified. Some configurations or features of one modality can be included in another
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54/54 modality or can be replaced by corresponding configurations or resources of another modality. And, apparently, it is understandable that a modality is configured by combining claims that are not explicitly cited in the attached claims or that can be included as new claims for amendments after filing an order.
[0218] Although the present invention has been described and illustrated here with reference to its preferred embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention. Thus, it is intended that the present invention covers the modifications and variations of this invention that are within the scope of the attached claims and their equivalents.
INDUSTRIAL APPLICABILITY [0219] As described above, the present invention can be applied to various wireless communication systems.

权利要求:
Claims (15)
[1]
1. Method of receiving downlink control information by user equipment (UE) in a wireless communication system, CHARACTERIZED by the fact that it comprises:
receive, through upper layer signaling, grouping information referring to groups of resource elements (REGs), each of the REGs corresponding to 1 resource block (RB) and 1 orthogonal frequency division multiplexing symbol (OFDM);
perform blind detection for a physical downlink control channel (PDCCH) on a set of control resources (CORESET) configured on a plurality of OFDM symbols; and acquire downlink control information (DCI) from the blindly detected PDCCH, in which, in blind detection to the PDCCH, when the cluster information indicates a first value, the UE performs the clustering so that only REGs located in the same RB and corresponding different OFDM symbols in CORESET are grouped as a grouping of 1 REG, and when the grouping information indicates a second value, the UE performs grouping so that the REGs located in the same RB and corresponding to the different OFDM symbols are grouped as a grouping of 1 REG together with the REGs located in different RBs in CORESET, in which the UE performs blind detection of the PDCCH assuming the same pre-coding for REGs that belong to the same REG cluster as a result of the REG cluster.
[2]
2. Method, according to claim 1, CHARACTERIZED by the fact that, when the grouping information indicates the first value, the size of
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2/6 grouping of 1 REG is configured to be the same as a number of the plurality of OFDM symbols to configure CORESET.
[3]
3. Method according to claim 1 or 2, CHARACTERIZED by the fact that, when the cluster information indicates the second value, the cluster size of 1 REG is configured to be the same as a number of REGs included in 1 control channel element (CCE).
[4]
4. Method according to claim 1,
CHARACTERIZED by the fact that one or more CORESETs including CORESET are configured in the UE; and where the grouping information and a type of control channel element mapping (CCE) -to-REG are indicated for each of the one or more CORESETs.
[5]
5. Method according to claim 1 or 4, CHARACTERIZED by the fact that the cluster information includes cluster size information indicating a number of REGs included in the cluster of 1 REG.
[6]
6. Method, according to claim 1, CHARACTERIZED by the fact that a type of control channel element mapping (CCE) -to-REG of CORESET is configured as a type of mapping interspersed between a type of localized mapping and the type of interleaved mapping.
[7]
7. Method, according to claim 6, CHARACTERIZED by the fact that the interleaving for the CCE-to-REG mapping is performed in a unit of a REG cluster using a REG cluster index.
[8]
8. Method according to claim 4 or 6, CHARACTERIZED by the fact that a supported cluster size is differently determined according to the type of CCE-to-REG mapping.
[9]
9. Method according to claim 1,
CHARACTERIZED by the fact that the grouping information includes
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3/6 at least one of intra-CCE cluster size information for the grouping of REGs belonging to the same control channel element (CCE) and inter-CCE cluster size information for the grouping of REGs belonging to different CCEs ; and where, when the cluster information includes the inter-CCE cluster size information, the UE performs blind detection for the PDCCH assuming the same pre-coding for REGs from different CCEs belonging to the same inter-CCE cluster.
[10]
10. Method according to claim 1,
CHARACTERIZED by the fact that, when the grouping information indicates the first value, the UE performs grouping of REG by time domain, and when the grouping information indicates the second value, the UE performs grouping of REG by time-frequency domain .
[11]
11. Method according to claim 1, CHARACTERIZED by the fact that a number of the plurality of OFDM symbols for configuring CORESET is 2 or
3.
[12]
12. Method, according to claim 1, CHARACTERIZED by the fact that the UE performs demodulation for the PDCCH assuming that the same pre-coding is applied to reference signals received through the REGs belonging to the same REG group.
[13]
13. Method of transmitting downlink control information through a base station (BS) in a wireless communication system, FEATURED by the fact that it comprises:
transmit, through upper layer signaling, grouping information referring to groups of resource elements (REGs), each of the REGs corresponding to 1 resource block (RB) and 1 orthogonal frequency division multiplexing symbol (OFDM); and
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4/6 transmit downlink control information (DCI) through a physical downlink control channel (PDCCH) in a set of control resources (CORESET) configured in a plurality of OFDM symbols, in which, in the transmission of DCI, when grouping information indicates a first value, BS performs the grouping so that only REGs located in the same RB and corresponding to different OFDM symbols in CORESET, are grouped as grouping of 1 REG, when the grouping information indicates a second value, the BS performs the grouping so that the REGs located in the same RB and corresponding to the different OFDM symbols are grouped as a grouping of 1 REG together with REGs located in different RBs in CORESET, and in which BS transmits DCI applying the same pre-coding for REGs belonging to the same REG group as a result of the REG group.
[14]
14. User equipment (UE) for receiving downlink control information, CHARACTERIZED by the fact that it comprises:
a receiver; and a processor to receive, through upper layer signaling using the receiver, grouping information for groups of resource elements (REGs), each of the REGs corresponding to 1 resource block (RB) and 1 division multiplexing symbol orthogonal frequency (OFDM), to perform blind detection for a physical downlink control channel (PDCCH) in a set of control resources (CORESET) configured in a plurality of OFDM symbols, and to acquire downlink control information (DCI) from the PDCCH blindly detected, where, in blind detection for PDCCH,
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5/6 when the grouping information indicates a first value, the processor performs the grouping so that only REGs located in the same RB and corresponding to different OFDM symbols in CORESET are grouped as grouping of 1 REG, and when the grouping information indicates a second value, the processor performs the grouping so that the REGs located in the same RB and corresponding to the different OFDM symbols are grouped as a grouping of 1 REG together with REGs located in different RBs in CORESET, and in which the processor performs blind detection PDCCH assuming the same pre-coding for REGs that belong to the same REG cluster as a result of the REG cluster.
[15]
15. Base station (BS) for transmitting downlink control information, CHARACTERIZED by the fact that it comprises:
a transmitter; and a processor to transmit, through upper layer signaling using the transceiver, grouping information for groups of resource elements (REGs), each of the REGs corresponding to 1 resource block (RB) and 1 division multiplexing symbol orthogonal frequency (OFDM), and to transmit downlink control information (DCI) through a physical downlink control channel (PDCCH) in a set of control resources (CORESET) configured in a plurality of OFDM symbols, where transmission of DCI, when the grouping information indicates a first value, the processor performs the grouping so that only REGs located in the same RB and corresponding to different OFDM symbols in CORESET are grouped as grouping of 1 REG,
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6/6 when the grouping information indicates a second value, the processor performs the grouping so that the REGs located in the same RB and corresponding to the different OFDM symbols are grouped as a grouping of 1 REG together with REGs located in different RBs in CORESET, and where the processor transmits DCI by applying the same pre-coding to REGs belonging to the same REG cluster as a result of the REG cluster.

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US20190103941A1|2019-04-04|

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US20210258099A1|2021-08-19|

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CN110419189A|2019-11-05|

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WO2018199585A1|2018-11-01|

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US20200259586A1|2020-08-13|

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PH12019500229A1|2019-10-21|

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JP2020518138A|2020-06-18|

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CL2019000063A1|2019-04-05|

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KR102072586B1|2020-03-02|

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EP3937403A1|2022-01-12|

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AU2018257012B2|2020-04-23|

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RU2700180C1|2019-09-13|

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KR20180130472A|2018-12-07|

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EP3499783B1|2021-11-03|

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CA3030543C|2021-03-16|

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AU2018257012A1|2019-01-17|

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KR20180119138A|2018-11-01|

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