Search

JP-7857289-B2 - Terminals, wireless communication methods, base stations and systems

JP7857289B2JP 7857289 B2JP7857289 B2JP 7857289B2JP-7857289-B2

Inventors

  • 松村 祐輝
  • 永田 聡
  • スン ウェイチー
  • ワン ジン
  • チン ラン

Assignees

  • 株式会社ＮＴＴドコモ

Dates

Publication Date
20260512
Application Date
20220329
Priority Date
20210521

Claims (6)

  1. A receiving unit that receives downlink control information for scheduling the uplink shared channel, which includes a first Sounding Reference Signal (SRS) Resource Indicator (SRI) field and a second SRI field, specifying the order of the SRS resource sets applied to each transmission of the non-codebook-based uplink shared channel, The system includes a control unit that determines, based on the order, which of the first SRS resource set corresponding to the first SRI field and the second SRS resource set corresponding to the second SRI field is applied to each transmission of the uplink shared channel, and performs control to transmit the uplink shared channel . The control unit is a terminal that expects the first SRI field and the second SRI field to specify the same number of SRS resources .
  2. The terminal according to claim 1 , wherein the control unit repeatedly applies the sequential SRS resource set to each transmission of the uplink shared channel if the number of sequential SRS resource sets is less than the number of repetitions.
  3. The terminal according to claim 1 or 2, wherein the control unit performs control to perform a transmission to which the first SRS resource set is applied using the first panel, and a transmission to which the second SRS resource set is applied using the second panel.
  4. The steps include receiving downlink control information for scheduling the uplink shared channel, which includes a first Sounding Reference Signal (SRS) Resource Indicator (SRI) field and a second SRI field, specifying the order of the SRS resource sets applied to each transmission of the non-codebook-based uplink shared channel, The steps include determining the SRS resource set to be applied to each transmission of the uplink shared channel from the first SRS resource set corresponding to the first SRI field and the second SRS resource set corresponding to the second SRI field, based on the order, and performing control to transmit the uplink shared channel, A wireless communication method for a terminal , comprising the step of expecting the first SRI field and the second SRI field to specify the same number of SRS resources .
  5. A transmission unit transmits downlink control information for scheduling the uplink shared channel to a terminal, which includes a first Sounding Reference Signal (SRS) Resource Indicator (SRI) field and a second SRI field, specifying the order of the SRS resource sets applied to each transmission of the non-codebook-based uplink shared channel. The terminal has a receiving unit which receives the uplink sharing channel, where the terminal determines the SRS resource set to be applied to each transmission of the uplink sharing channel from the first SRS resource set corresponding to the first SRI field and the second SRS resource set corresponding to the second SRI field based on the order , and transmits the uplink sharing channel . The first SRI field and the second SRI field are base stations that specify the same number of SRS resources .
  6. A system comprising a terminal according to any one of claims 1 to 3 and a base station according to claim 5 .

Description

This disclosure relates to terminals, wireless communication methods , base stations , and systems in next-generation mobile communication systems. In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was specified with the aim of achieving even higher data rates and lower latency (Non-Patent Literature 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9). Successor systems to LTE (for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later) are also being considered. 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 Figure 1 shows an example of an SRS resource set configured in the first embodiment.Figure 2 shows an example of the correspondence between the values of the SRI field and the SRS resource set and SRS resource in Embodiment 1.1.1.Figure 3 shows an example of the correspondence between the SRSI field value and the SRS resource set in Embodiment 1.1.2.Figures 4A and 4B show an example of specifying an SRS resource set in Embodiment 1.2.Figure 5 shows an example of an SRS resource set configured in the second embodiment.Figures 6A and 6B show an example of an SRS resource set of a modified embodiment 2.2.Figures 7A and 7B show another example of an SRS resource set, a modified version of Embodiment 2.2.Figure 8 shows an example of an SRS resource set configured in the third embodiment.Figure 9 shows an example of the correspondence between the values of the SRI field and the SRS resource set and SRS resource in Embodiment 3.1.1.Figure 10 shows an example of a schematic configuration of a wireless communication system according to one embodiment.Figure 11 shows an example of the configuration of a base station according to one embodiment.Figure 12 shows an example of the configuration of a user terminal according to one embodiment.Figure 13 shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. (Spatial relations for SRS and PUSCH) In Rel. 15/16 NR, the UE may receive information used to transmit a measurement reference signal (e.g., a Sounding Reference Signal (SRS)) (SRS configuration information, e.g., parameters in the "SRS-Config" of the RRC control element). Specifically, the UE may receive at least one of the following: information about one or more SRS resource sets (SRS resource set information, e.g., "SRS-ResourceSet" of the RRC control element) and information about one or more SRS resources (SRS resource information, e.g., "SRS-Resource" of the RRC control element). A single SRS resource set may be associated with a predetermined number (e.g., one or more) SRS resources (a predetermined number of SRS resources may be grouped together). Each SRS resource may be identified by an SRS Resource Indicator (SRI) or an SRS Resource Identifier. The SRS resource set information may include the SRS resource set ID (SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, the SRS resource type (e.g., Periodic SRS, Semi-Persistent SRS, or Aperiodic SRS), and information on the SRS usage. Here, the SRS resource type may be one of the following: Periodic SRS (P-SRS), Semi-Persistent SRS (SP-SRS), or Aperiodic CSI (A-SRS). Furthermore, the UE may transmit P-SRS and SP-SRS periodically (or periodically after activation), and A-SRS based on DCI's SRS requests. Furthermore, the application (RRC parameter "usage", L1 (Layer-1) parameter "SRS-SetUse") may be, for example, beam management, codebook (CB), noncodebook (NCB), antenna switching, etc. The SRS for codebook (CB) or noncodebook (NCB) applications may be used to determine the precoder for codebook-based or noncodebook-based PUSCH transmissions based on the SRI. For example, in the case of codebook-based transmission, the UE may determine the precoder for PUSCH transmission based on the SRI, Transmitted Rank Indicator (TRI), and Transmitted Precoding Matrix Indicator (TPMI). In the case of non-codebook-based transmission, the UE may determine the precoder for PUSCH transmission based on the SRI. SRS resource information may include the SRS resource ID (SRS-ResourceId), number of SRS ports, SRS port number, transmit comb, SRS resource mapping (e.g., time and/or frequency resource location, resource offset, resource period, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), hopping-related information, SRS resource type, sequence ID, SRS spatial relationship information, etc. The spatial relationship information of the SRS (for example, the "spatialRelationInfo" of the RRC information element) may indicate spatial rela