User terminal and wireless communication method

Abstract

In order to enable appropriate communication even when multiple transmitting and receiving points are used for communication, one embodiment of the user terminal disclosed herein comprises: a receiving unit that monitors and receives downlink control channel candidates corresponding to downlink control information respectively transmitted from multiple transmitting and receiving points; and a control unit that controls the reception processing of other downlink control information transmitted within a specific period based on at least one of the information contained in the specific downlink control information and the information notified by higher-layer signaling.

Description

Technical Field

[0001] The present disclosure relates to a user terminal and a wireless communication method in a next generation mobile communication system. Background Art

[0002] In the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) has been standardized to achieve even higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Releases 10-14) has been standardized to achieve even higher capacity and higher sophistication than LTE (3rd Generation Partnership Project (3GPP), Releases 8 and 9).

[0003] Successor systems to LTE (for example, also referred to as 5th generation mobile communication system (5G), 5G+ (plus), NR (New Radio), 3GPP Rel. 15 and later) are also under study.

[0004] In existing LTE systems (e.g., LTE Rel. 8-13), user terminals (UEs) control the reception of downlink shared channels (e.g., the Physical Downlink Shared Channel (PDSCH)) based on downlink control information (also known as downlink control information (DCI) and DL assignments) transmitted from a radio base station. Furthermore, UEs control the transmission of uplink shared channels (e.g., the Physical Uplink Shared Channel (PUSCH)) based on DCI (also known as UL grants).

[0005] Prior art literature

[0006] Non-patent literature

[0007] Non-Patent Document 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] Research is underway to utilize beamforming (BF) for communication in future wireless communication systems (e.g., NR, 5G, 5G+, or Rel. 1.16 and later). To improve communication quality using BF, research is underway to control at least one of signal transmission and reception by taking into account the Quasi-Co-Location (QCL) relationship (QCL relationship) between multiple signals.

[0010] Furthermore, it is envisioned that in future wireless communication systems, multiple transmission and reception points will coordinately transmit non-coherent downlink signals (e.g., PDSCH). In this case, it is also considered to control the scheduling of PDSCHs transmitted by multiple transmission and reception points using one or more downlink control information (or PDCCH).

[0011] However, when more than one DCI is used to control the scheduling of PDSCHs transmitted by multiple transmission / reception points, controlling the reception and processing of this DCI becomes a challenge. For example, to receive DCI, the UE needs to monitor the downlink control channel (or downlink control channel candidates) used to transmit the DCI, but the specific processing has not been fully studied. Without proper reception and processing of downlink control information or downlink control channels, the quality or throughput of communications using multiple transmission / reception points may deteriorate.

[0012] The present disclosure has been made in view of the above-mentioned circumstances, and one of its objects is to provide a user terminal and a wireless communication method that can appropriately perform communication even when communication is performed using multiple transmission and reception points.

[0013] Means for solving problems

[0014] A user terminal involved in one embodiment of the present disclosure is characterized by comprising: a receiving unit that monitors and receives downlink control channel candidates corresponding to downlink control information respectively transmitted from multiple transmitting and receiving points; and a control unit that controls the reception processing of other downlink control information transmitted within a specific period based on at least one of information contained in the specific downlink control information and information notified by higher-layer signaling.

[0015] Effects of the Invention

[0016] According to one aspect of the present disclosure, even when communication is performed using a plurality of transmission and reception points, communication can be performed appropriately. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1A and Figure 1B This is a diagram showing an example of a case where DCI and PDSCH are transmitted from multiple transmission and reception points.

[0018] Figure 2A-2D This is a diagram showing an example of a table defining AL specified by DCI.

[0019] Figure 3A and Figure 3B This is a diagram showing an example of a table defining a time offset specified by DCI.

[0020] Figure 4A and Figure 4B This is a diagram showing another example of a table defining a time offset specified by DCI.

[0021] Figure 5 This is a diagram showing an example of a situation in which information related to PDSCH is exchanged between TRPs.

[0022] Figure 6 This is a diagram showing an example of a schematic configuration of a wireless communication system according to one embodiment.

[0023] Figure 7 This is a diagram showing an example of the configuration of a base station according to one embodiment.

[0024] Figure 8 This is a diagram showing an example of the configuration of a user terminal according to one embodiment.

[0025] Figure 9 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to one embodiment. DETAILED DESCRIPTION

[0026] In future wireless communication systems (e.g., Rel. 16 and later), research is underway to transmit incoherent DL signals (e.g., PDSCH) from multiple transmission and reception points. Coordinating incoherent DL signals (or DL ​​channels) and transmitting them from multiple transmission and reception points is also referred to as NCJT (Non-Coherent Joint Transmission). In this specification, a transmission and reception point (TRP) may also be referred to as a transmission point, reception point, panel, or cell.

[0027] It is also conceivable to use one or more DCIs to control the scheduling of unrelated PDSCHs transmitted from multiple transmission and reception points. As an example, multiple downlink control channels (or DCIs) are used to schedule PDSCHs transmitted from multiple transmission and reception points.

[0028] Figure 1A In the example, PDSCH is sent from multiple panels to the UE (e.g., PDSCH using NCJT). Figure 1B The case where PDSCH (for example, PDSCH using NCJT) is sent to the UE from multiple transmit / receive points (TRPs).

[0029] In this case, separate DCIs can be configured to schedule the PDSCHs transmitted from various transmission / reception points (e.g., panels or TRPs). For example, a configuration can be configured such that a first DCI#A scheduling the PDSCHs transmitted from transmission / reception point #A and a second DCI#B scheduling the PDSCHs transmitted from transmission / reception point #B are transmitted to the UE.

[0030] Therefore, when PDSCHs are transmitted from multiple transmission / reception points, how to control the monitoring of the DCI or PDCCH corresponding to each PDSCH becomes a problem. For example, when monitoring multiple PDCCHs transmitted from multiple transmission / reception points, how to control the UE's receiving operations (e.g., monitoring operations or decoding operations) becomes a problem.

[0031] As one aspect of the present disclosure, the inventors of the present invention conceive that at least one of the multiple downlink control information sent within a specific range includes information related to other downlink control information (also called auxiliary information) and is used for reception processing of other downlink control information.

[0032] The following describes this embodiment in detail with reference to the accompanying drawings. Each embodiment can be used alone or in combination. In addition, the transmission and reception points shown below can also be interpreted as at least one of a panel and a transmission and reception point.

[0033] (First Method)

[0034] In the first method, in a wireless communication system supporting communication using multiple transmission and reception points, specific downlink control information (hereinafter also referred to as specific DCI) includes information related to other downlink control information (hereinafter also referred to as other DCI) and notifies it.

[0035] Information related to other DCI may also be information that can be used for receiving other DCI (e.g., monitoring or decoding), and may also be referred to as auxiliary information. Furthermore, a structure may be configured such that specific DCI and other DCI are transmitted within a specific time range (e.g., the same time slot). Information related to specific DCI may also be included in other DCI.

[0036] For example, a bit field for notifying information related to other DCIs may be configured in a specific DCI. The UE only needs to control reception operations for other DCIs (or PDCCHs) based on the specific bit field included in the specific DCI.

[0037] In this way, by including information related to other DCI in a specific DCI, the UE can perform reception operations for the other DCI based on the information related to the other DCI. This may reduce the number of blind decodings of the other DCI or the number of monitoring times of PDCCH candidates (or search spaces) corresponding to the other DCI.

[0038] <Restrictions on the Relationship between Specific DCI and Other DCI>

[0039] The specific DCI and other DCI may also be DCI that schedules a physical shared channel with the same transmission direction. For example, both the specific DCI and other DCI may be DCI that schedules the PUSCH (also referred to as UL grant or UL DCI). In addition, both the specific DCI and other DCI may be DCI that schedules the PDSCH (also referred to as DL assignment or DL ​​DCI). In addition, the specific DCI and other DCI may also be sent within a specific time range (e.g., the same time slot).

[0040] Alternatively, the specific DCI and other DCI may also use the same DCI format. For example, the specific DCI and other DCI may also use DCI format 1_1 sent in the same time slot.

[0041] Alternatively, the specific DCI and the other DCI may be DCIs sent from different transmission / reception points within a specific time range (eg, the same time slot). Each transmission / reception point may also be associated with a different DMRS port (or DMRS port group).

[0042] Alternatively, a specific DCI and other DCIs may also be associated with CCE indices and aggregation levels (ALs). For example, the values of the CCE indices for both the specific DCI and other DCIs may also be set to either odd or even numbers. Alternatively, the ALs of the specific DCI and other DCIs may also be set to overlapping values or non - overlapping values.

[0043] In this way, by restricting or limiting the relationship between the specific DCI and other DCIs, it is possible to reduce the blind decoding of the DCI or the number of times of monitoring the PDCCH candidates (or search space) corresponding to the DCI.

[0044] <Information related to the DCI>

[0045] The information related to other DCIs (or other PDCCHs) contained in a specific DCI (or specific PDCCH) may be at least one of the following.

[0046] (1) Whether there are other DCIs transmitted within a specific time range (e.g., the same time slot)

[0047] (2) The number of other DCIs transmitted within a specific time range (e.g., the same time slot) or the total number of DCIs

[0048] (3) The PDCCH structure ID (PDCCH - Config ID) of other DCIs

[0049] (4) The search space ID (Search Space ID) of other DCIs

[0050] (5) The control resource set ID (Control Resource Set ID) of other DCIs <E000119><000012 -->(6) The aggregation level (Aggregation level) of other DCIs

[0052] (7) The CCE index (CCE index) of other DCIs <00001 -->(8) The DCI format of other DCIs

[0054] (9) The relationship of time resource location between other DCIs and the specific DCI (Relationship of time resource location)

[0055] (10) The relationship of frequency resource location between other DCIs and the specific DCI (Relationship of frequency resource location)

[0056] For example, when a specific DCI includes information indicating that no other DCI exists (the example in (1) above), the UE may omit the reception operation for the other DCI after decoding the specific DCI. Furthermore, when a specific DCI includes information indicating that N other DCIs exist (the example in (2) above), the UE controls the UE to perform the reception operation for the N DCIs after decoding the specific DCI.

[0057] Furthermore, when a specific DCI includes at least one of the PDCCH structure ID (example (3) above), search space ID (example (4) above), and control resource set ID (example (5) above) of other DCI, the UE may selectively perform a reception operation on the structure corresponding to the specified ID. Furthermore, when a specific DCI includes the AL (e.g., AL=4) of other DCI (example (6) above), the UE may limit monitoring of the other DCI to the specified AL (e.g., AL=4).

[0058] Furthermore, when a specific DCI includes a CCE index of another DCI (e.g., an odd-numbered CCE index) (e.g., example (7) above), the UE may limit monitoring of the other DCI to the specified CCE index (e.g., an odd-numbered CCE index). Furthermore, when a specific DCI includes a DCI format of another DCI (e.g., DCI format 0_1) (e.g., example (8) above), the UE may limit monitoring of the other DCI to the specified DCI format (e.g., DCI format 0_1).

[0059] Furthermore, when the specific DCI includes a positional relationship of time resources between other DCI and the specific DCI (e.g., an offset of T1) (e.g., example (8) above), the UE may limit the reception operation for the other DCI to time resources that are only T1 away from the specific DCI in the time direction. Furthermore, when the specific DCI includes a positional relationship of frequency resources between other DCI and the specific DCI (e.g., an offset of F1) (e.g., example (9) above), the UE may limit the reception operation for the other DCI to frequency resources that are only F1 away from the specific DCI in the frequency direction.

[0060] When multiple DCIs are transmitted in a time slot, the UE controls the reception of the other DCIs based on information related to the other DCIs obtained from the initially received (e.g., decoded) DCI. This reduces the operational load (e.g., the number of blind decodings) of the other DCIs.

[0061] Fig. 2 shows an example of a case where the information related to other DCI included in a specific DCI is the aggregation level ((6) above). The values ​​of the table may be defined in advance in the specification or may be set by higher layer signaling or the like.

[0062] Figure 2A 、 Figure 2B Indicates the case where the aggregation level (AL) of other DCI is specified using 1 bit. Figure 2A This shows an example of a case where AL=16 is set by higher layer signaling. Figure 2B This shows an example of a case where AL=16 is not set by higher layer signaling.

[0063] In setting Figure 2A And when the DCI notification field of a specific DCI is "1", the UE performs reception processing on other DCIs for AL=8 and 16. In this case, the UE may not perform reception processing (e.g., decoding) for AL=1, 2, 4. On the other hand, when setting Figure 2A When the DCI notification field of a specific DCI is "0", the UE performs reception processing on other DCIs for AL=1, 2, and 4. In this case, the UE does not need to perform reception processing (eg, decoding) on ​​AL=8 and 16.

[0064] In setting Figure 2B And when the DCI notification field of a specific DCI is "1", the UE performs reception processing on other DCIs for AL=4 and 8. In this case, the UE may not perform reception processing (e.g., decoding) for AL=1 and 2. On the other hand, when setting Figure 2B When the DCI notification field of a specific DCI is "0", the UE performs reception processing on other DCI for AL = 1 and 2. In this case, the UE does not need to perform reception processing (eg, decoding) for AL = 4 and 8.

[0065] Figure 2C 、 Figure 2D Indicates the case where the aggregation level (AL) of other DCI is specified using 2 bits. Figure 2C This shows an example of a case where AL=16 is set by higher layer signaling. Figure 2D This shows an example of a case where AL=16 is not set by higher layer signaling.

[0066] In setting Figure 2C When the DCI notification field of a specific DCI is "11", the UE performs reception processing on other DCIs for AL=16. In this case, the UE may not perform reception processing (e.g., decoding) for AL=1, 2, 4, 8. Figure 2CWhen the DCI notification field of the configured and specified DCI is "10", the UE performs reception processing on other DCIs for AL = 8. In this case, the UE does not need to perform reception processing (eg, decoding) for AL = 1, 2, 4, or 16.

[0067] In addition, when setting Figure 2C If the DCI notification field of a specific DCI is "01", the UE performs reception processing on other DCIs for AL=4. In this case, the UE may not perform reception processing (e.g., decoding) for AL=1, 2, 8, 16. Figure 2C When the DCI notification field of a specific DCI is "00", the UE performs reception processing on other DCIs for AL=1 and 2. In this case, the UE does not need to perform reception processing (eg, decoding) for AL=4, 8, and 16.

[0068] In setting Figure 2D When the DCI notification field of a specific DCI is "11", the UE performs reception processing on other DCIs for AL=8. In this case, the UE may not perform reception processing (e.g., decoding) for AL=1, 2, or 4. Figure 2D Furthermore, when the DCI notification field of a specific DCI is "10", the UE performs reception processing on other DCIs for AL = 4. In this case, the UE does not need to perform reception processing (eg, decoding) for AL = 1, 2, or 8.

[0069] In addition, when setting Figure 2D If the DCI notification field of a specific DCI is "01", the UE performs reception processing on other DCIs for AL=2. In this case, the UE may not perform reception processing (e.g., decoding) for AL=1, 4, 8, 16. Figure 2D When the DCI notification field of a specific DCI is "00", the UE performs reception processing on other DCIs for AL = 1. In this case, the UE does not need to perform reception processing (eg, decoding) for AL = 2, 4, 8, or 16.

[0070] In this way, the UE controls the reception processing of other DCI based on the AL associated with other DCI obtained from a specific DCI (e.g., the DCI after the initial reception processing). As a result, the reception processing of other DCI can be limited to a specific AL, thereby reducing the operational load of the reception processing (e.g., the number of blind decoding operations, etc.).

[0071] Figures 3 and 4 show an example of a case where the information related to other DCI included in a specific DCI is the relationship between the time resource positions of the other DCI and the specific DCI ((9) above). The values ​​in the table can be predefined in the specification or set using higher layer signaling.

[0072] Figure 3A Indicates the case where the relationship between the time resource positions of other DCI and specific DCI is specified by 1 bit. Here, the case where the relationship between the time resource positions of other DCI and specific DCI (time offset) is represented by the interval between the start codeword of other DCI and the start codeword of specific DCI is shown, but it is not limited to this.

[0073] Included in DCI#1 (e.g., specific DCI) Figure 3A When the bit value shown is "1", the UE determines that the time offset between DCI#1 and DCI#2 (e.g., other DCI) is greater than X1 symbol and less than X2 symbol (X2>X1≥0). Figure 3A When the indicated bit value is "0", the UE determines that the time offset between DCI#1 and DCI#2 is equal to or less than X1 symbol.

[0074] Figure 3B This example shows the time offset between DCIs when the bit value contained in the DCI is "1". Here, when DCI#1 is TCI#1 (or TRP, for example, X1 is 2), the interval (time offset) between the start codeword of DCI#1 and the start codeword of DCI#2 is less than 2 codewords.

[0075] In addition to DCI #1, DCI #2 may also include a bit value of “1.” In this case, it can be assumed that DCI #2 corresponds to specific DCI and DCI #1 corresponds to other DCI.

[0076] Figure 4A Indicates the case where the relationship between the time resource positions of other DCI and specific DCI is specified using 2 bits. Here, the case where the relationship between the time resource positions of other DCI and specific DCI (time offset) is represented by the interval between the start codeword of other DCI and the start codeword of specific DCI is shown, but it is not limited to this.

[0077] Included in DCI#1 (e.g., specific DCI) Figure 4A In the case of the bit value "11" shown, the UE determines that the time offset (start symbol of DCI#2 - start symbol of DCI#1) between DCI#1 and DCI#2 (e.g., other DCI) is greater than -X2 symbols and less than -X1 symbols. Figure 3AIn the case of the bit value "10" shown, the UE determines that the time offset between DCI#1 and DCI#2 is larger than X1 symbols and equal to or smaller than X2 symbols.

[0078] Included in DCI#1 Figure 3A When the bit value shown is "01", the UE determines that the time offset between DCI#1 and DCI#2 is greater than or equal to -X1 symbols and less than 0. Figure 3A In the case of the indicated bit value "00", the UE determines that the time offset between DCI#1 and DCI#2 is greater than or equal to 0 and less than or equal to X1 symbol.

[0079] Figure 4B This example shows the time offset between DCIs when the bit value contained in DCI #1 is "00" and the bit value contained in DCI #2 is "01." For example, when X1 is 2, the interval (time offset) between the start symbol of DCI #1 and the start symbol of DCI #2 is 2 symbols or less.

[0080] In addition, when DCI#2 includes a bit value, it can also be assumed that DCI#2 corresponds to a specific DCI and DCI#1 corresponds to another DCI.

[0081] In this way, the UE controls the reception processing of other DCI based on the time offset information related to other DCI obtained from the specific DCI, taking into account the time offset between the specific DCI and the other DCI. This makes it possible to appropriately grasp the allocated time resources of other DCI and perform reception processing, thereby reducing the load of the reception processing operation. In addition, frequency offset can also be used with Figure 3A 、 Figure 4A The same table is defined and applied.

[0082] (Second Method)

[0083] In the second method, in a wireless communication system supporting communication using multiple transmission and reception points, information related to each DCI is notified to the UE using higher layer signaling, or higher layer signaling and MAC control information (MAC CE).

[0084] The base station may also use higher-layer signaling to notify the UE of at least one of the following (1)-(10) shown in the first embodiment as information related to multiple DCIs (e.g., DCIs corresponding to each TRP). Alternatively, the base station may use higher-layer signaling to set multiple candidates (or items) and use MAC control information to set activation or deactivation of specific candidates.

[0085] (1) Whether there is DCI sent within a specific time range (e.g., the same time slot)

[0086] (2) The number of DCIs sent within a specific time range (e.g., the same time slot) or the total number of DCIs

[0087] (3) The PDCCH structure ID (PDCCH-Config ID) of each DCI

[0088] (4) The search space ID (Search Space ID) of each DCI

[0089] (5) The control resource set ID (Control Resource Set ID) of each DCI

[0090] (6) The aggregation level of each DCI

[0091] (7) The CCE index of each DCI

[0092] (8) The DCI format of each DCI

[0093] (9) The relationship of time resource location between each DCI (Relationship of time resourcelocation)

[0094] (10) The relationship of frequency resource location between each DCI (Relationship of frequencyresource location)

[0095] In addition, the information related to each DCI notified to the UE (at least one of the above (1) to (10)) can also be shared between each TRP (or the base station corresponding to each TRP). In this case, inter-gNB signaling (e.g., Xn signaling) can also be used to semi-statically send and receive the information related to each DCI (or other DCIs) between the base stations.

[0096] In addition, the information related to each DCI can be notified to the UE from a specific (e.g., one) TRP or base station, or can be notified to the UE from multiple TRPs respectively.

[0097] <Notification of AL>

[0098] Imagine using high-layer signaling to notify the UE of the aggregation level (AL) of each DCI. For example, the base station may also notify the UE that a first AL (e.g., AL=4, 8) is applied to DCI#1 and a second AL (e.g., AL=8, 16) is applied to DCI#2 (Example 1). In this case, information related to the TRP (e.g., TRPID) corresponding to each DCI may also be notified. For example, when DCI#1 corresponds to TRP#1 and DCI#2 corresponds to TRP#2, the corresponding relationship between DCI and TRP is notified to the UE.

[0099] In addition, in addition to TRP, the UE may also be notified of the correspondence between at least one of PDSCH, codeword (CW), transport block (TB) and DMRS port (or DMRS port group) and DCI.

[0100] Alternatively, the base station may notify the UE that the same AL (eg, AL=4, 8) is applied to DCI#1 and DCI#2 (Example 2).

[0101] Each TRP (or each base station) shares the AL applied to each DCI between base stations, and controls the sending of each DCI based on information related to the shared AL.

[0102] <Notification of time resource location>

[0103] Consider a scenario where higher-layer signaling is used to notify the UE of information related to the time resource locations (e.g., time offsets) between DCIs. For example, a base station notifies the UE of information related to the time resources of each DCI sent within a specific time domain (e.g., the same time slot). The following shows an example of information related to the time resources of each DCI.

[0104] DCI#1: Controls the first to X1th symbols in the resource set (e.g., X1=7)

[0105] DCI#2: Controls the third to X2th symbols in the resource set (e.g., X2=9)

[0106] The UE only needs to control the reception and processing of each DCI based on the time resources notified by higher-layer signaling. In addition, the correspondence between the TRP (or PDSCH, codeword (CW), transport block (TB), DMRS port (or DMRS port group) corresponding to each DCI can be defined in advance using the specifications or notified to the UE by the base station.

[0107] <Notification of the presence or absence of DCI or the number of DCIs>

[0108] Consider a scenario where the UE is notified of information related to the presence or absence of DCI or the number of DCIs transmitted in a specific time domain (e.g., each time slot) using higher-layer signaling. For example, the base station may also use 2 bits to notify any of the following three states (3 status) for the number of DCIs in each time slot. The number of bits used and the number of states notified are examples and are not limited to these.

[0109] State 1 (equivalent to bit value "00"): at most one DCI is sent from TRP#1 (or DMRS port group #1, control resource set #1, etc.)

[0110] State 2 (equivalent to bit value "01"): at most one DCI is sent from TRP#2 (or DMRS port group #2, control resource set #2, etc.)

[0111] State 3 (equivalent to bit value "10"): Send up to X (e.g., X is the number of TRPs) DCIs from each TRP (or each DMRS port group, each control resource set, etc.)

[0112] The base station may also notify a pattern within a specific period (time duration) using higher layer signaling. For example, the base station may notify the state of each time slot (e.g., "00, 10, 01, 10, 00, 10, 01, 10, 00, 10") as a pattern for 10 time slots.

[0113] The UE determines the number of DCIs transmitted in each time slot based on the mode notified by higher-layer signaling and controls the reception processing for each DCI. Furthermore, the UE may control DCI reception based on the previously configured mode before a new mode is configured by higher-layer signaling. For example, if the UE determines that only one DCI is transmitted in a time slot, it may control the UE to not receive other DCIs.

[0114] When multiple TRPs (or base stations) are connected by a non-ideal backhaul with significant latency, it is difficult for each base station to dynamically grasp information related to other DCIs (e.g., DCIs corresponding to other TRPs). By notifying each DCI of information related to the DCI using higher-layer signaling (or higher-layer signaling and MAC control information) as shown in the second method, the UE and base station can appropriately grasp information related to each DCI even when multiple base stations are connected by a non-ideal backhaul.

[0115] (Third Method)

[0116] In the third method, information related to the number and source of each PDSCH transmission sent to the UE is shared among multiple TRPs (or base stations). The source of the PDSCH transmission can also be the TRP, DMRS port (or DMRS port group), control resource set, codeword (CW) or transport block (TB) corresponding to the PDSCH transmission.

[0117] In a system where multiple base stations are connected by a non-ideal backhaul, when PDSCHs are scheduled independently in multiple TRPs, it may be impossible to appropriately select the MCS for each PDSCH repeatedly transmitted from multiple TRPs due to interference between the TRPs. In order to appropriately select the MCS for each PDSCH, it is preferred that multiple TRPs (or base stations) cooperate to transmit PDSCHs in a time slot.

[0118] For example, a specific TRP can select MCS by considering PDSCH transmitted from other TRPs, etc. by understanding whether PDSCH is transmitted from other TRPs in a certain time slot.

[0119] Regarding the number of PDSCH transmissions and the source pattern, inter-gNB signaling (e.g., Xn signaling) can also be used to transmit and receive (or share) between base stations (see Figure 5 ). The Xn signaling may also include the UE ID and the bit string pattern corresponding to the PDSCH sent (or indicated) to the UE during a specific period.

[0120] For example, the base station notifies any one of the following three states (3 status) using 2 bits for PDSCH transmission in each time slot. The number of bits used and the number of states notified are examples and are not limited thereto.

[0121] State 1 (equivalent to bit value "00"): at most one PDSCH is transmitted from TRP#1 (or DMRS port group #1, control resource set #1, etc.)

[0122] State 2 (equivalent to bit value "01"): at most one PDSCH is sent from TRP#2 (or DMRS port group #2, control resource set #2, etc.)

[0123] State 3 (equivalent to bit value "10"): Up to X (e.g., X is the number of TRPs) PDSCHs are sent from each TRP (or each DMRS port group, each control resource set, etc.)

[0124] The base station may also use Xn signaling to notify a pattern of a specific period (time duration) between base stations. For example, the base station may notify the state of each time slot (e.g., "00, 10, 01, 10, 00, 00, 01, 01, 10, 10") as a pattern for 10 time slots.

[0125] Each base station (or each TRP) determines the MCS in each time slot based on information shared between base stations (e.g., mode). This enables collaboration and MCS determination between base stations (or TRPs). Furthermore, information shared between base stations need not be communicated to the UE. In this case, the UE only needs to control PDSCH detection based on the MCS specified using the DCI.

[0126] In this way, by sharing the PDSCH information in each time slot between base stations (or TRPs), the base station can set an appropriate MCS for PDSCH transmission even when multiple TRPs (or base stations) are connected using a backhaul (non-ideal backhaul) with non-negligible delay.

[0127] (Wireless Communication System)

[0128] The following describes a configuration of a wireless communication system according to an embodiment of the present disclosure. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above-described embodiments of the present disclosure, or a combination thereof.

[0129] Figure 6 This figure shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may also be a system that implements communication using LTE (Long Term Evolution) or 5G NR (Fifth Generation Mobile Communication System New Radio), standardized by the 3GPP (Third Generation Partnership Project).

[0130] In addition, the wireless communication system 1 can also support dual connectivity between multiple RATs (Radio Access Technologies) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0131] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the mobile node, and the LTE (E-UTRA) base station (eNB) is the network node.

[0132] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC: NR-NR Dual Connectivity)) where both MN and SN are NR base stations (gNB)).

[0133] The wireless communication system 1 may also include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are narrower than the macrocell C1. User terminals 20 may also be located within at least one of the cells. The arrangement and number of cells and user terminals 20 are not limited to those shown in the figure. Hereinafter, when not distinguishing between base stations 11 and 12, they are collectively referred to as base stations 10.

[0134] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0135] Each CC may also be included in at least one of the first frequency band (frequency range 1 (FR1: Frequency Range 1)) and the second frequency band (frequency range 2 (FR2: Frequency Range 2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0136] Furthermore, the user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0137] Multiple base stations 10 can also be connected by wired (for example, optical fiber based on CPRI (Common Public Radio Interface), X2 interface, etc.) or wireless (for example, NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 equivalent to the upper station can also be called an IAB (Integrated Access Backhaul) donor, and the base station 12 equivalent to the relay station can also be called an IAB node.

[0138] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of EPC (Evolved Packet Core), 5GCN (5G Core Network), and NGC (Next Generation Core).

[0139] The user terminal 20 may also be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0140] In the wireless communication system 1, a radio access scheme based on orthogonal frequency division multiplexing (OFDM) may be used. For example, CP-OFDM (Cyclic Prefix OFDM), DFT-s-OFDM (Discrete Fourier Transform Spread OFDM), OFDMA (Orthogonal Frequency Division Multiple Access), SC-FDMA (Single Carrier Frequency Division Multiple Access), etc. may be used in at least one of the downlink (DL) and uplink (UL).

[0141] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (eg, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be applied to the UL and DL radio access schemes.

[0142] In the wireless communication system 1, as downlink channels, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. can also be used.

[0143] In addition, in the wireless communication system 1, as uplink channels, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. can also be used.

[0144] The PDSCH is used to transmit user data, higher-layer control information, and SIBs (System Information Blocks). The PUSCH can also be used to transmit user data, higher-layer control information, and MIBs (Master Information Blocks). The PBCH can also be used to transmit MIBs (Master Information Blocks).

[0145] Lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (downlink control information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.

[0146] In addition, the DCI that schedules the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be interpreted as DL data, and the PUSCH may also be interpreted as UL data.

[0147] In PDCCH detection, a control resource set (CORESET) and a search space can also be used. A CORESET corresponds to the resources for searching for DCI. A search space corresponds to the search area and search method for PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space settings.

[0148] A search space may also correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. Furthermore, the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in this disclosure may be used interchangeably.

[0149] Uplink control information (UCI: Uplink Control Information) can also be transmitted through the PUCCH. The uplink control information includes at least one of channel state information (CSI: Channel State Information), delivery confirmation information (for example, also called HARQ-ACK (Hybrid Automatic Repeat reQuest ACKnowledgement)), ACK / NACK, etc.), and scheduling request (SR: Scheduling Request). The random access preamble code used to establish a connection with the cell can also be transmitted through the PRACH.

[0150] In the present disclosure, downlink, uplink, etc. may be expressed without the word "link." Furthermore, various channels may be expressed without the word "physical" at the beginning.

[0151] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may also be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may also be transmitted.

[0152] A synchronization signal, for example, may be at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SSs (PSS, SSS) and PBCHs (and DMRS for the PBCH) may also be referred to as an SS / PBCH block or SSB (SS block). Furthermore, SSs and SSBs may also be referred to as reference signals.

[0153] In addition, in the wireless communication system 1, a measurement reference signal (sounding reference signal (SRS)) and a demodulation reference signal (DMRS) may also be transmitted as an uplink reference signal (UL-RS). DMRS may also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0154] (Base Station)

[0155] Figure 7 This figure shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface (transmission line interface) 140. Furthermore, the control unit 110, the transmitting / receiving unit 120, the transmitting / receiving antenna 130, and the transmission path interface 140 may each be provided in one or more units.

[0156] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and the base station 10 can also be assumed to have other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0157] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which this disclosure relates.

[0158] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. It may also control transmission and reception, measurement, etc., using the transmission and reception unit 120, the transmission and reception antennas 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting up, releasing, etc.) of communication channels, manage the status of the base station 10, manage radio resources, etc.

[0159] The transceiver unit 120 may also include a baseband unit 121, an RF (Radio Frequency) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transceiver circuit, and the like, which are described based on the common knowledge in the technical field involved in this disclosure.

[0160] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0161] The transmitting and receiving antenna 130 can be formed of an antenna described based on the common knowledge in the technical field to which this disclosure relates, such as an array antenna.

[0162] The transmitting and receiving unit 120 may also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the aforementioned uplink channel, uplink reference signal, etc.

[0163] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmit beam and a receive beam.

[0164] The sending and receiving unit 120 (sending processing unit 1211) can also perform PDCP (Packet Data Convergence Protocol) layer processing, RLC (Radio Link Control) layer processing (for example, RLC retransmission control), MAC (Medium Access Control) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0165] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, discrete Fourier transform (DFT: Discrete Fourier Transform) processing (as needed), inverse fast Fourier transform (IFFT: Inverse Fast Fourier Transform) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0166] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0167] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, and demodulation into a baseband signal on the radio frequency band signal received by the transmitting and receiving antenna 130 .

[0168] The transmitting and receiving unit 120 (receiving processing unit 1212) can also apply receiving processing such as analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0169] The transmitting and receiving unit 120 (measuring unit 123) may also perform measurements related to the received signal. For example, the measuring unit 123 may also perform RRM (Radio Resource Management) measurements, CSI (Channel State Information) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., RSRP (Reference Signal Received Power)), received quality (e.g., RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio), SNR (Signal to Noise Ratio)), signal strength (e.g., RSSI (Received Signal Strength Indicator)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0170] The transmission path interface 140 can also send and receive signals (return signaling) between the devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0171] In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 120 , the transmitting and receiving antenna 130 , and the transmission path interface 140 .

[0172] In addition, the transmitting and receiving unit 120 transmits downlink control information using the downlink control channel. The transmitting and receiving unit 120 may also transmit information related to other downlink control information (or each downlink control information) by including information in at least one of the specific downlink control information and information notified by higher layer signaling.

[0173] The control unit 110 may also perform control so that the transmission directions of the physical shared channels scheduled by the specific downlink control information and other downlink control information are the same, or the downlink control information formats of the specific downlink control information and other downlink control information are the same, or the specific downlink control information and other downlink control information are sent from different sending and receiving points.

[0174] (User Terminal)

[0175] Figure 8 This figure shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Furthermore, more than one of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0176] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and the user terminal 20 may also be assumed to have other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0177] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which this disclosure relates.

[0178] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission, reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals and forward them to the transmission and reception unit 220.

[0179] The transceiver unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, and the like, as described based on the common knowledge in the technical field involved in this disclosure.

[0180] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0181] The transmitting and receiving antenna 230 can be composed of an antenna described based on the common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0182] The transmitting and receiving unit 220 may also receive the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the aforementioned uplink channel, uplink reference signal, etc.

[0183] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0184] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0185] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0186] In addition, whether or not to apply DFT processing may also be based on the transform precoding setting. For a certain channel (e.g., PUSCH), if transform precoding is activated (enabled), the transmitting / receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the aforementioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting / receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the aforementioned transmission processing without performing DFT processing.

[0187] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0188] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may also perform amplification, filter processing, and demodulation into a baseband signal on the radio frequency band signal received by the transmitting and receiving antenna 230 .

[0189] The transmitting and receiving unit 220 (receiving processing unit 2212) can also apply receiving processing such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0190] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to received signals. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signals. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0191] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0192] Furthermore, the transmitting / receiving unit 220 monitors and receives downlink control channel candidates corresponding to downlink control information transmitted from multiple transmission / reception points. The transmitting / receiving unit 220 may also receive other downlink control information transmitted within a specific period based on at least one of information included in the specific downlink control information and information notified by higher layer signaling.

[0193] The control unit 210 controls reception processing of other downlink control information transmitted within a specific period (e.g., the same time slot) based on at least one of information included in the specific downlink control information and information notified by higher-layer signaling. Alternatively, the specific downlink control information and the other downlink control information may be scheduled on the same physical shared channel in the same transmission direction, or the specific downlink control information and the other downlink control information may have the same downlink control information format, or the specific downlink control information and the other downlink control information may be transmitted from different transmission and reception points.

[0194] In addition, the information contained in at least one of the specific downlink control information and the information notified by high-layer signaling may also be at least one of the downlink control channel structure ID, search space ID, control resource set ID, aggregation level, control channel element ID and downlink control information format of other downlink control information.

[0195] Furthermore, at least one of the information included in the specific downlink control information and the information notified by higher layer signaling may also be information related to at least one of the positional relationship of time resources and the positional relationship of frequency resources between the specific downlink control information and other downlink control information.

[0196] The control unit 210 may also receive higher layer signaling for specifying the content of information included in specific downlink control information.

[0197] (Hardware Structure)

[0198] In addition, the block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, by wired, wireless, etc.) and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0199] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any of them are as described above, and the implementation method is not particularly limited.

[0200] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 9 This figure shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. The base station 10 and user terminal 20 described above can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0201] In addition, in this disclosure, the terms such as device, circuit, equipment, section, and unit are interchangeable. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0202] For example, although only one processor 1001 is shown, multiple processors may be provided. Furthermore, processing may be performed by a single processor, or by two or more processors simultaneously, sequentially, or using other methods. Furthermore, processor 1001 may be implemented on more than one chip.

[0203] Regarding the various functions in the base station 10 and the user terminal 20, for example, they are achieved by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0204] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including interfaces with peripheral devices, a control device, a computing device, registers, etc. For example, at least a portion of the control unit 110 (210) and the transceiver unit 120 (220) described above may also be implemented by the processor 1001.

[0205] In addition, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and performs various processes based on the program. As a program, a program that causes a computer to perform at least a portion of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks can also be implemented similarly.

[0206] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program code), software modules, etc. for implementing the wireless communication method according to one embodiment of the present disclosure.

[0207] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical / magnetic disk (such as a compact disk (CD-ROM), etc.), a digital versatile disk, a Blu-ray disk, a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, stick, or key drive), a magnetic stripe, a database, a server, or other appropriate storage medium. The storage 1003 may also be referred to as an auxiliary storage device.

[0208] The communication device 1004 is hardware (a transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network. For example, it is also referred to as a network device, a network controller, a network card, a communication module, etc. To implement at least one of frequency division duplex (FDD) and time division duplex (TDD), the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the aforementioned transmitting and receiving unit 120 (220) and the transmitting and receiving antenna 130 (230) may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be physically or logically separated from the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0209] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, LED (Light Emitting Diode) lamp, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrated (e.g., a touch panel).

[0210] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0211] Furthermore, the base station 10 and user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array), and may use this hardware to implement part or all of each functional block. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0212] (Variation)

[0213] In addition, the terms described in this disclosure and the terms required for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, or may be referred to as a pilot, pilot signal, etc. depending on the applied standard. In addition, a component carrier (CC) may also be referred to as a cell, frequency carrier, carrier frequency, etc.

[0214] A radio frame can also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) that constitute a radio frame can also be called a subframe. Furthermore, a subframe can also be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) that is independent of the parameter set (numerology).

[0215] Here, a parameter set may also refer to communication parameters applied to at least one of the transmission and reception of a signal or channel. For example, a parameter set may also represent at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, and specific windowing processing performed by the transmitter and receiver in the time domain.

[0216] A time slot may also be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0217] A time slot may also contain multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

[0218] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units used for signal transmission. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective equivalents. Furthermore, the terms frame, subframe, time slot, mini-time slot, and symbol may be used interchangeably in this disclosure.

[0219] For example, a subframe can also be called a TTI, multiple consecutive subframes can also be called a TTI, and a time slot or a mini-time slot can also be called a TTI. In other words, at least one of the subframe and the TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. In addition, the unit representing the TTI can also be called a time slot, a mini-time slot, etc. instead of a subframe.

[0220] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules each user terminal by allocating radio resources (such as the frequency bandwidth and transmit power available to each user terminal) in TTI units. The definition of TTI is not limited to this.

[0221] The TTI may also be a unit of time for transmitting channel-coded data packets (transport blocks), code blocks, code words, etc., and may also be a unit of processing for scheduling, link adaptation, etc. Furthermore, when a TTI is given, the time interval (e.g., the number of symbols) to which the transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.

[0222] Furthermore, when a time slot or a mini-time slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) may also be the minimum time unit for scheduling. Furthermore, the number of time slots (mini-time slots) constituting the minimum time unit for scheduling may also be controlled.

[0223] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a subslot, a time slot, etc.

[0224] In addition, long TTI (for example, normal TTI, subframe, etc.) can also be interpreted as TTI with a time length exceeding 1ms, and short TTI (for example, shortened TTI, etc.) can also be interpreted as TTI with a TTI length smaller than long TTI and greater than 1ms.

[0225] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it may also include one or more consecutive subcarriers (subcarriers). The number of subcarriers contained in an RB can also be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers contained in an RB can also be determined based on the parameter set.

[0226] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks.

[0227] In addition, one or more RBs may also be referred to as a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, etc.

[0228] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0229] A bandwidth part (BWP) (also known as a fractional bandwidth) can also represent a subset of contiguous common resource blocks (RBs) used for a particular parameter set within a carrier. Common RBs can also be identified by their index relative to the common reference point of the carrier. PRBs can also be defined within a BWP and numbered within that BWP.

[0230] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). For a UE, one or more BWPs may be configured within one carrier.

[0231] At least one of the configured BWPs may be activated, and the UE may not assume that it will transmit or receive specific signals / channels outside of the activated BWP. In addition, "cell," "carrier," etc. in this disclosure may also be interpreted as "BWP."

[0232] The above-mentioned structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots within a slot, the number of symbols and RBs within a slot or mini-slot, the number of subcarriers within an RB, the number of symbols within a TTI, the symbol length, and the cyclic prefix (CP) length can be varied in various ways.

[0233] Furthermore, the information and parameters described in this disclosure may be expressed as absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may be indicated by specific indexes.

[0234] In this disclosure, the names used for parameters, etc., are not intended to be limiting in any respect. Furthermore, the mathematical formulas for these parameters, etc., may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not intended to be limiting in any respect.

[0235] Information, signals, and the like described in this disclosure may also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referred to throughout the foregoing description may also be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0236] Furthermore, information, signals, etc. can be output from a higher layer (upper layer) to a lower layer (lower layer), or from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0237] Input and output information, signals, etc. can be stored in a specific location (e.g., memory) or managed using a management table. Input and output information, signals, etc. can be overwritten, updated, or appended. Output information, signals, etc. can also be deleted. Input information, signals, etc. can also be sent to other devices.

[0238] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (DCI: Downlink Control Information), uplink control information (UCI: Uplink Control Information)), high-layer signaling (e.g., RRC (Radio Resource Control) signaling, broadcast information (Master Information Block (MIB: Master Information Block), System Information Block (SIB: System Information Block), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.

[0239] In addition, physical layer signaling may also be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as RRC message, for example, RRC Connection Setup message, RRC Connection Reconfiguration message, etc. In addition, MAC signaling may also be notified using MAC Control Element (MACCE (Control Element)), for example.

[0240] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0241] The determination can be made by a value represented by a bit (0 or 1), a true or false value (Boolean value) represented by true (true) or false (false), or by comparison of numerical values ​​(for example, comparison with a specific value).

[0242] Whether software is called software, firmware, middleware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software module, application, software application, software package, routine, sub-routine, object, executable file, execution thread, procedure, function, etc.

[0243] Furthermore, software, instructions, information, and the like may also be transmitted and received via a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, DSL, etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0244] The terms "system" and "network" used in this disclosure can be used interchangeably. "Network" may also refer to devices included in the network (eg, base stations).

[0245] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "quasi-co-location (QCL)", "TCI state (Transmission Configuration Indication state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0246] In this disclosure, terms such as "base station (BS)," "wireless base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," and "component carrier" are used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0247] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the base station's overall coverage area can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station for indoor use (remote radio head (RRH))). Terms such as "cell" or "sector" refer to a portion or the entire coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within that coverage area.

[0248] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (UE)”, and “terminal” are used interchangeably.

[0249] A mobile station is also sometimes referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other appropriate terminology.

[0250] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Furthermore, at least one of the base station and the mobile station may also be a device mounted on a mobile object, a mobile object itself, etc. The mobile object may be a vehicle (e.g., a vehicle, an aircraft, etc.), a mobile object that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing communication operations. For example, at least one of the base station and the mobile station may also be an IoT (Internet of Things) device such as a sensor.

[0251] In addition, the base station in the present disclosure can also be interpreted as a user terminal. For example, the various methods / implementations of the present disclosure can also be applied to a structure in which the communication between a base station and a user terminal is replaced by communication between multiple user terminals (for example, it can also be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, it can also be set as a structure in which the user terminal 20 has the functions of the above-mentioned base station 10. In addition, expressions such as "uplink" and "downlink" can also be interpreted as expressions corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can also be interpreted as side channels.

[0252] Likewise, the user terminal in the present disclosure may also be interpreted as a base station. In this case, the base station 10 may also have the functions of the user terminal 20 described above.

[0253] In the present disclosure, actions are assumed to be performed by a base station, and sometimes, depending on the circumstances, by its upper node. Obviously, in a network including one or more network nodes including a base station, various actions performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, but not limited to, an MME (Mobility Management Entity) and an S-GW (Serving-Gateway), or a combination thereof.

[0254] The various methods / implementations described in this disclosure may be used individually or in combination, and may be switched between them during execution. Furthermore, the processing procedures, sequences, flow charts, and the like of the various methods / implementations described in this disclosure may be reversed as long as they do not conflict. For example, the elements of various steps described in this disclosure are presented in an illustrative order, but are not limited to the specific order presented.

[0255] The various modes and embodiments described in the present disclosure may also be applied to LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), RAT (New-Radio Access Technology), NR (New Radio), NX (New Radio Access), FX (Future Generation Radio Access), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on these. In addition, multiple systems can also be combined for application (for example, LTE or LTE-A, combined with 5G, etc.).

[0256] The phrase “based on” used in this disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on.”

[0257] Any reference to an element using the designations "first," "second," etc., as used in this disclosure, does not necessarily define the quantity or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, reference to a first and a second element does not necessarily imply that only two elements may be used, or that the first element necessarily takes precedence over the second element in some manner.

[0258] The term "determining" as used in this disclosure may encompass a variety of actions. For example, "determining" may also be considered as "judging," calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, etc.

[0259] In addition, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on receiving (for example, receiving information), transmitting (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc.

[0260] In addition, "judgment (decision)" can also be regarded as a situation in which "judgment (decision)" is made on resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can also be regarded as a situation in which "judgment (decision)" is made on some actions.

[0261] In addition, "judgment (decision)" can also be interpreted as "assuming", "expecting", "considering", etc.

[0262] As used in this disclosure, the terms "connected," "coupled," and all variations thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between the two elements being "connected" or "coupled." The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may also be interpreted as "access."

[0263] In the present disclosure, when two elements are connected, it can be considered that they are "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0264] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other." Alternatively, the term may also mean "A and B are each different from C." Terms such as "separate" and "bound" may also be interpreted in the same way as "different."

[0265] In this disclosure, when the terms "include," "including," and variations thereof are used, these terms, like the term "comprising," have an inclusive meaning. Furthermore, the term "or" used in this disclosure does not mean an exclusive OR.

[0266] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure may also include a case where the noun following the article is in a plural form.

[0267] While the inventions disclosed herein have been described in detail above, it will be apparent to those skilled in the art that the inventions disclosed herein are not limited to the embodiments described herein. The inventions disclosed herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the claims. Therefore, the descriptions in this disclosure are for illustrative purposes only and are not intended to limit the inventions disclosed herein in any way.

Claims

1. A terminal comprising: a control unit that determines whether first downlink control information, i.e., first DCI, sent from a first transmission / reception point, i.e., a first TRP, and second DCI sent from a second TRP are associated based on information related to a search space of the first DCI and a search space of the second DCI notified through higher layer signaling; and The receiving unit receives the first DCI and the second DCI sent in the same time slot based on the information.

2. The terminal according to claim 1, wherein: The first DCI and the second DCI have the same DCI format.

3. The terminal according to claim 1, wherein: The control unit determines, based on the information, that the same aggregation level is applied to the first DCI and the second DCI.

4. A wireless communication method, used for a terminal, characterized in that: have: A step of determining whether first downlink control information (i.e., first DCI) sent from a first transmission / reception point (i.e., a first TRP) and second DCI sent from a second TRP are associated based on information related to a search space of the first DCI and a search space of the second DCI notified through higher layer signaling; as well as The step of receiving the first DCI and the second DCI transmitted in the same time slot based on the information.

5. A base station comprising: The control unit determines the association between the first downlink control information, i.e., the first DCI and the second DCI, sent from the first transmission and reception point, i.e., the first TRP, and the second TRP, respectively, in the same time slot as information related to the search space of the first DCI and the search space of the second DCI; and The sending unit sends the information to the terminal through high-layer signaling.

6. A system having a terminal and a base station, The terminal has: a control unit, determining whether first downlink control information (i.e., first DCI) sent from a first transmission / reception point (i.e., a first TRP) and second DCI sent from a second TRP are associated, based on information related to a search space of the first DCI and a search space of the second DCI notified through higher layer signaling; as well as a receiving unit, receiving the first DCI and the second DCI sent in the same time slot based on the information, The base station has: a control unit, determining the association between the first DCI and the second DCI as information related to a search space of the first DCI and a search space of the second DCI; as well as The sending unit sends the information to the terminal through high-layer signaling.

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