SRS. Dark gray: superseded by later agreements and not supported Light gray: covered by later agreements and can be replaced fully by later agreements Yellow: open issues in RAN1 (including UE feature design) R18 MIMO SRS [110] Agreement For Rel-18 reference signal enhancements, support and specify the following features (the agreed WID scopes apply): SRS enhancement to manage inter-TRP cross-SRS interference targeting TDD CJT via SRS capacity enhancement and/or interference randomization; RAN1 should strive to minimize the number of schemes supported in Rel-18 SRS enhancements to enable 8 Tx UL operation and 8T8R SRS for DL operation. Target usage includes antenna switching, codebook/non-codebook based SRS SRS comb offset hopping and cyclic shift hopping [109] Agreement Study the following for SRS enhancement to manage inter-TRP cross-SRS interference targeting TDD CJT via SRS interference randomization and/or capacity enhancement Randomized frequency-domain resource mapping for SRS transmission E.g., further enhancements to frequency hopping, comb hopping Randomized code-domain resource mapping for SRS transmission E.g., cyclic shift hopping/randomization, sequence hopping/randomization, per-hop sequence from a long SRS sequence Randomized transmission of SRS E.g., pseudo-random muting of SRS transmission for periodic and semi-persistent SRS Per-TRP power control and/or power control of one SRS towards to multiple TRPs SRS TD OCC Increasing the maximum number of cyclic shifts E.g., multiplying mask sequence to the legacy SRS sequence to effectively increase the maximum cyclic shifts Precoded SRS for DL CSI acquisition Enhanced signaling for flexible SRS transmission E.g., dynamic update of SRS parameters Partial frequency sounding extensions E.g., larger partial frequency sounding factor, starting RB location hopping enhancements, partial frequency hopping on other bandwidths corresponding to , besides the last bandwidth Enhanced configuration of SRS transmission to enable more efficient SRS parameter assignment E.g., configuration of (sequence index within a group) per SRS resource E. g., configuration of cyclic shift per SRS port per SRS resource. Resource mapping for SRS transmission based on network-provided parameters or system parameters E.g., SRS resource mapping based on network-provided parameters (e.g., configurable indexes) or system parameters (e.g., slot index) Note: PAPR performance and maintaining DFT waveform property should be considered when deciding the enhancement for Rel-18. [110bis-e] Agreement Support at least one of the following for SRS interference randomization Randomized code-domain resource mapping for SRS transmission by introducing cyclic shift hopping / randomization to SRS resource Comb offset hopping for SRS The comb offset is determined pseudo-randomly as a function of time (e.g., slot index, symbol index) and/or NW configured ID with a certain UE-specific initialization. FFS: Other details, e.g., how the comb offset value is determined by the parameters for each SRS port of a SRS resource for a SRS transmission occasion. [110bis-e] Agreement For comb offset hopping for SRS and for randomized code-domain resource mapping for SRS transmission via cyclic shift hopping / randomization, further study the following: The hopping pattern (e.g., the pseudo-random sequence, time-domain granularity for hopping) The time-domain parameter and/or behavior (e.g., slot index, symbol index, re-initialization behavior) Network-configured ID for UE-specific initialization How the comb offset / cyclic shift value is determined by the parameters for each SRS port of a SRS resource for a SRS transmission occasion Potential issue on multiplexing with legacy UEs if ▇▇ ▇▇▇▇▇▇▇ and/or comb offset hopping are enabled Applicability to periodic/semi-persistent/aperiodic SRS Other details are not excluded [111] Agreement For SRS comb offset hopping and/or cyclic shift hopping, for each SRS port, FFS: Hopping pattern Support at least hopping based on slot index, OFDM symbol index FFS: Use of symbol group based on repetition factor FFS: Additional details on intra-slot hopping based on OFDM symbol index, inter-slot hopping based on slot index, per occasion of SRS resource FFS: Re-initialization periodicity Applicable to at least periodic/semi-persistent SRS with usage antennaSwitching FFS: Other types of SRS FFS: Configuring a subset of comb offsets / cyclic shifts for comb offset hopping / cyclic shift hopping, respectively FFS: Combined comb offset hopping and cyclic shift hopping, supporting both, or down selecting one [111] Agreement For SRS comb offset hopping and/or cyclic shift hopping, for each SRS port, the hopping pattern is determined based on: Option 1: The hopping pattern is based on the pseudo-random sequence c(i), initialized with a network-configured ID. FFS: The ID could be cell ID , SRS sequence identity , C-RNTI, or a new ID FFS: The relation between the legacy group / sequence hopping and the new hopping [111] Agreement For SRS interference randomization, support one from the following options (to be decided in RAN1#112): Opt. 1: Cyclic shift hopping Opt. 2: Comb offset hopping Opt. 3: Both cyclic shift hopping and comb offset hopping FFS: details including whether to support separate and/or combined hopping FFS: details on UE capability and signaling [112] Agreement For SRS interference randomization, support: Opt. 3: Both cyclic shift hopping and comb offset hopping. At least the two features can be separately configured FFS: Combined cyclic shift hopping and comb offset hopping for a UE FFS: Separate or combined with SRS sequence group hopping / sequence hopping FFS: Associated UE capability [112] Agreement For SRS comb offset hopping and/or cyclic shift hopping, for each SRS port, the hopping pattern is determined based on the pseudo-random sequence c(i), initialized with one of the following IDs. Option 1: Reuse the SRS sequence identity . Option 2: Introduce new ID(s). FFS: the value range, one new ID or two separate new IDs, default ID(s) [112] Agreement For SRS comb offset hopping and/or cyclic shift hopping, the time-domain hopping behavior depends on at least the slot index within a radio frame and OFDM symbol index , and select at least one of the following options: Option 1: Within a slot, hopping based on the repetition factor and symbol index that is the same across the R repetitions. Option 2: Within a slot, hopping based on only the symbol index . Option 3: No intra-slot hopping. FFS: Time domain hopping behaviour further depends on system frame number (SFN) . FFS: reinitialization periodicity of N radio frames or reinitialization based on system frame number. FFS: Whether to adopt the same option(s) for comb offset hopping and cyclic shift hopping (if supported separately) FFS: At least support reinitialization at the beginning of each radio frame. [112bis-e] Agreement For SRS comb offset hopping and/or cyclic shift hopping, for a SRS resource, the hopping pattern initialization ID determined by , where is a new ID for cyclic shift hopping and/or comb offset hopping. The range of the new ID is from 0 to 1023 [112bis-e] Agreement For a SRS resource configured with comb offset hopping and/or cyclic shift hopping, If the repetition factor R = 1, within a slot, the time-domain hopping behavior depends on the OFDM symbol index of each symbol. If the repetition factor R > 1, For cyclic shift hopping, within a slot, the time-domain hopping behavior depends on the OFDM symbol index of each symbol. For comb offset hopping, within a slot, the time-domain hopping behavior depends on one of the following alternatives: Alt1: The OFDM symbol index of the first symbol across the R repetitions. Alt2: The OFDM symbol index of each symbol. Alt3: The OFDM symbol index of each symbol or the first symbol across the R repetitions based on configuration, and FFS configuration details. [112bis-e] Agreement For a SRS resource configured with comb offset hopping, if the repetition factor R > 1, within a slot, the time-domain hopping behavior depends on the OFDM symbol index l' of each symbol or the first symbol across the R repetitions based on RRC configuration, and FFS configuration details. UE can indicate whether it supports one or both the options. Details to be discussed in UE feature. [112bis-e] Agreement For SRS comb offset hopping / cyclic shift hopping, support reinitialization at the beginning of every N radio frame(s), where N ≥ 1. FFS: N is fixed or configurable. [112bis-e] Agreement Whether SRS comb offset hopping can be combined with one of group / sequence hopping on a SRS resource depends on UE feature/capability design. FFS: Whether SRS cyclic shift hopping can be combined with one of group / sequence hopping on a SRS resource depends on UE feature/capability design. FFS: UE feature/capability design details. [113] Agreement For SRS comb offset hopping / cyclic shift hopping reinitialization periodicity of N radio frame(s): N = 128 [113] Agreement Support configuring a subset of comb offsets when comb offset hopping is configured, and configuring a subset of cyclic shifts when cyclic shift hopping is configured. The subset configuration applies to all the port(s) in the SRS resource, and all the port(s) in the SRS resource has (have) the same hopping offset value on an OFDM symbol. This is a UE-optional feature. [113] Agreement For SRS cyclic shift hopping, support finer time-delay-domain granularity, e.g., , where can be randomly chosen from at each SRS transmission. Note: The finer granularity above only applies to the cyclic shift offsets when cyclic shift hopping is enabled. If a subset for cyclic shifts is configured, this feature cannot be configured. Above is a UE optional feature. [113] Agreement SRS comb offset hopping / cyclic shift hopping can be configured for aperiodic SRS. [113] Agreement Whether SRS cyclic shift hopping can be combined with one of group / sequence hopping on a SRS resource depends on UE feature/capability design. [113] Agreement SRS comb offset hopping and cyclic shift hopping can be configured for a SRS resource at the same time as a separate UE capability. No joint hopping scheme is supported. [114] Agreement When finer time-delay-domain granularity for SRS cyclic shift hopping is configured, K is 2 FFS (to be decided this week) Support of K=4 [114] Agreement For the SRS hopping formula in cyclic shift hopping or comb offset hopping except for SRS configured with TDM, let and : For cyclic shift hopping: , where , and , If cyclicShiftHoppingSubset is not configured, . If cyclicShiftHoppingFinerGranularity is not configured, and . If cyclicShiftHoppingFinerGranularity is configured, , and is the value configured by cyclicShiftHoppingFinerGranularity If cyclicShiftHoppingSubset is configured, denotes the th element of the configured subset, is the number of elements in the subset, and . For comb offset hopping: , where , and , if or UE is provided with combOffsetHoppingWithRepetition=Per-symbol; otherwise, is the OFDM symbol index of the first symbol across the R repetitions within the slot. If combOffsetHoppingSubset is not configured, , and . If combOffsetHoppingSubset is configured, denotes the th element of the configured subset, and is the number of elements in the subset. [114] Agreement When a subset of comb offsets for comb offset hopping is configured, and when a subset of cyclic shifts for cyclic shift hopping is configured, support the following option for configuring the subset S={S(0), S(1), …, S(z-1)} with , where for comb offset hopping and for cyclic shift hopping, and: Option 1b: S(0), S(1), …, S(z-1) are configured via a Z-length bitmap with S(i-1) being the i-th bit set as 1. [114bis] Agreement Adopt the text proposal for TS38.211 on cyclic shift / comb offset hopping ID notation:
Appears in 1 contract
Sources: R18 Mimo Post Ran1 114bis Agreements
SRS. Dark gray: superseded by later agreements and not supported Light gray: covered by later agreements and can be replaced fully by later agreements Yellow: open issues in RAN1 (including UE feature design) R18 MIMO SRS [110] Agreement For Rel-18 reference signal enhancements, support and specify the following features (the agreed WID scopes apply): SRS enhancement to manage inter-TRP cross-SRS interference targeting TDD CJT via SRS capacity enhancement and/or interference randomization; RAN1 should strive to minimize the number of schemes supported in Rel-18 SRS enhancements to enable 8 Tx UL operation and 8T8R SRS for DL operation. Target usage includes antenna switching, codebook/non-codebook based SRS SRS comb offset hopping and cyclic shift hopping [109] Agreement Study the following for SRS enhancement to manage inter-TRP cross-SRS interference targeting TDD CJT via SRS interference randomization and/or capacity enhancement Randomized frequency-domain resource mapping for SRS transmission E.g., further enhancements to frequency hopping, comb hopping Randomized code-domain resource mapping for SRS transmission E.g., cyclic shift hopping/randomization, sequence hopping/randomization, per-hop sequence from a long SRS sequence Randomized transmission of SRS E.g., pseudo-random muting of SRS transmission for periodic and semi-persistent SRS Per-TRP power control and/or power control of one SRS towards to multiple TRPs SRS TD OCC Increasing the maximum number of cyclic shifts E.g., multiplying mask sequence to the legacy SRS sequence to effectively increase the maximum cyclic shifts Precoded SRS for DL CSI acquisition Enhanced signaling for flexible SRS transmission E.g., dynamic update of SRS parameters Partial frequency sounding extensions E.g., larger partial frequency sounding factor, starting RB location hopping enhancements, partial frequency hopping on other bandwidths corresponding to , besides the last bandwidth Enhanced configuration of SRS transmission to enable more efficient SRS parameter assignment E.g., configuration of (sequence index within a group) per SRS resource
E. g., configuration of cyclic shift per SRS port per SRS resource. Resource mapping for SRS transmission based on network-provided parameters or system parameters E.g., SRS resource mapping based on network-provided parameters (e.g., configurable indexes) or system parameters (e.g., slot index) Note: PAPR performance and maintaining DFT waveform property should be considered when deciding the enhancement for Rel-18. [110bis-e] Agreement Support at least one of the following for SRS interference randomization Randomized code-domain resource mapping for SRS transmission by introducing cyclic shift hopping / randomization to SRS resource Comb offset hopping for SRS The comb offset is determined pseudo-randomly as a function of time (e.g., slot index, symbol index) and/or NW configured ID with a certain UE-specific initialization. FFS: Other details, e.g., how the comb offset value is determined by the parameters for each SRS port of a SRS resource for a SRS transmission occasion. [110bis-e] Agreement For comb offset hopping for SRS and for randomized code-domain resource mapping for SRS transmission via cyclic shift hopping / randomization, further study the following: The hopping pattern (e.g., the pseudo-random sequence, time-domain granularity for hopping) The time-domain parameter and/or behavior (e.g., slot index, symbol index, re-initialization behavior) Network-configured ID for UE-specific initialization How the comb offset / cyclic shift value is determined by the parameters for each SRS port of a SRS resource for a SRS transmission occasion Potential issue on multiplexing with legacy UEs if ▇▇ ▇▇▇▇▇▇▇ and/or comb offset hopping are enabled Applicability to periodic/semi-persistent/aperiodic SRS Other details are not excluded [111] Agreement For SRS comb offset hopping and/or cyclic shift hopping, for each SRS port, FFS: Hopping pattern Support at least hopping based on slot index, OFDM symbol index FFS: Use of symbol group based on repetition factor FFS: Additional details on intra-slot hopping based on OFDM symbol index, inter-slot hopping based on slot index, per occasion of SRS resource FFS: Re-initialization periodicity Applicable to at least periodic/semi-persistent SRS with usage antennaSwitching FFS: Other types of SRS FFS: Configuring a subset of comb offsets / cyclic shifts for comb offset hopping / cyclic shift hopping, respectively FFS: Combined comb offset hopping and cyclic shift hopping, supporting both, or down selecting one [111] Agreement For SRS comb offset hopping and/or cyclic shift hopping, for each SRS port, the hopping pattern is determined based on:
Option 1: The hopping pattern is based on the pseudo-random sequence c(i), initialized with a network-configured ID. FFS: The ID could be cell ID , SRS sequence identity , C-RNTI, or a new ID FFS: The relation between the legacy group / sequence hopping and the new hopping [111] Agreement For SRS interference randomization, support one from the following options (to be decided in RAN1#112): Opt. 1: Cyclic shift hopping Opt. 2: Comb offset hopping Opt. 3: Both cyclic shift hopping and comb offset hopping FFS: details including whether to support separate and/or combined hopping FFS: details on UE capability and signaling [112] Agreement For SRS interference randomization, support: Opt. 3: Both cyclic shift hopping and comb offset hopping. At least the two features can be separately configured FFS: Combined cyclic shift hopping and comb offset hopping for a UE FFS: Separate or combined with SRS sequence group hopping / sequence hopping FFS: Associated UE capability [112] Agreement For SRS comb offset hopping and/or cyclic shift hopping, for each SRS port, the hopping pattern is determined based on the pseudo-random sequence c(i), initialized with one of the following IDs. Option 1: Reuse the SRS sequence identity . Option 2: Introduce new ID(s). FFS: the value range, one new ID or two separate new IDs, default ID(s) [112] Agreement For SRS comb offset hopping and/or cyclic shift hopping, the time-domain hopping behavior depends on at least the slot index within a radio frame and OFDM symbol index , and select at least one of the following options:
Option 1: Within a slot, hopping based on the repetition factor and symbol index that is the same across the R repetitions.
Option 2: Within a slot, hopping based on only the symbol index . Option 3: No intra-slot hopping. FFS: Time domain hopping behaviour further depends on system frame number (SFN) . FFS: reinitialization periodicity of N radio frames or reinitialization based on system frame number. FFS: Whether to adopt the same option(s) for comb offset hopping and cyclic shift hopping (if supported separately) FFS: At least support reinitialization at the beginning of each radio frame. [112bis-e] Agreement For SRS comb offset hopping and/or cyclic shift hopping, for a SRS resource, the hopping pattern initialization ID determined by , where is a new ID for cyclic shift hopping and/or comb offset hopping. The range of the new ID is from 0 to 1023 [112bis-e] Agreement For a SRS resource configured with comb offset hopping and/or cyclic shift hopping, If the repetition factor R = 1, within a slot, the time-domain hopping behavior depends on the OFDM symbol index of each symbol. If the repetition factor R > 1, For cyclic shift hopping, within a slot, the time-domain hopping behavior depends on the OFDM symbol index of each symbol. For comb offset hopping, within a slot, the time-domain hopping behavior depends on one of the following alternatives: Alt1: The OFDM symbol index of the first symbol across the R repetitions. Alt2: The OFDM symbol index of each symbol. Alt3: The OFDM symbol index of each symbol or the first symbol across the R repetitions based on configuration, and FFS configuration details. [112bis-e] Agreement For a SRS resource configured with comb offset hopping, if the repetition factor R > 1, within a slot, the time-domain hopping behavior depends on the OFDM symbol index l' of each symbol or the first symbol across the R repetitions based on RRC configuration, and FFS configuration details. UE can indicate whether it supports one or both the options. Details to be discussed in UE feature. [112bis-e] Agreement For SRS comb offset hopping / cyclic shift hopping, support reinitialization at the beginning of every N radio frame(s), where N ≥ 1. FFS: N is fixed or configurable. [112bis-e] Agreement Whether SRS comb offset hopping can be combined with one of group / sequence hopping on a SRS resource depends on UE feature/capability design. FFS: Whether SRS cyclic shift hopping can be combined with one of group / sequence hopping on a SRS resource depends on UE feature/capability design. FFS: UE feature/capability design details. [113] Agreement For SRS comb offset hopping / cyclic shift hopping reinitialization periodicity of N radio frame(s): N = 128 [113] Agreement Support configuring a subset of comb offsets when comb offset hopping is configured, and configuring a subset of cyclic shifts when cyclic shift hopping is configured. The subset configuration applies to all the port(s) in the SRS resource, and all the port(s) in the SRS resource has (have) the same hopping offset value on an OFDM symbol. This is a UE-optional feature. [113] Agreement For SRS cyclic shift hopping, support finer time-delay-domain granularity, e.g., , where can be randomly chosen from at each SRS transmission. Note: The finer granularity above only applies to the cyclic shift offsets when cyclic shift hopping is enabled. If a subset for cyclic shifts is configured, this feature cannot be configured. Above is a UE optional feature. [113] Agreement SRS comb offset hopping / cyclic shift hopping can be configured for aperiodic SRS. [113] Agreement Whether SRS cyclic shift hopping can be combined with one of group / sequence hopping on a SRS resource depends on UE feature/capability design. [113] Agreement SRS comb offset hopping and cyclic shift hopping can be configured for a SRS resource at the same time as a separate UE capability. No joint hopping scheme is supported. [114] Agreement When finer time-delay-domain granularity for SRS cyclic shift hopping is configured, K is 2 FFS (to be decided this week) Support of K=4 [114] Agreement For the SRS hopping formula in cyclic shift hopping or comb offset hopping except for SRS configured with TDM, let and : For cyclic shift hopping: , where , and , If cyclicShiftHoppingSubset is not configured, . If cyclicShiftHoppingFinerGranularity is not configured, and . If cyclicShiftHoppingFinerGranularity is configured, , and is the value configured by cyclicShiftHoppingFinerGranularity If cyclicShiftHoppingSubset is configured, denotes the th element of the configured subset, is the number of elements in the subset, and . For comb offset hopping: , where , and , if or UE is provided with combOffsetHoppingWithRepetition=Per-symbol; otherwise, is the OFDM symbol index of the first symbol across the R repetitions within the slot. If combOffsetHoppingSubset is not configured, , and . If combOffsetHoppingSubset is configured, denotes the th element of the configured subset, and is the number of elements in the subset. [114] Agreement When a subset of comb offsets for comb offset hopping is configured, and when a subset of cyclic shifts for cyclic shift hopping is configured, support the following option for configuring the subset S={S(0), S(1), …, S(z-1)} with , where for comb offset hopping and for cyclic shift hopping, and: Option 1b: S(0), S(1), …, S(z-1) are configured via a Z-length bitmap with S(i-1) being the i-th bit set as 1. [114bis] Agreement Adopt the text proposal for TS38.211 on cyclic shift / comb offset hopping ID notation:.
Appears in 1 contract
Sources: R18 Mimo Post Ran1 114 Agreements
SRS. Dark gray: superseded by later agreements and not supported Light gray: covered by later agreements and can be replaced fully by later agreements Yellow: open issues in RAN1 (including UE feature design) R18 MIMO SRS [110] Agreement For Rel-18 reference signal enhancements, support and specify the following features (the agreed WID scopes apply): SRS enhancement to manage inter-TRP cross-SRS interference targeting TDD CJT via SRS capacity enhancement and/or interference randomization; RAN1 should strive to minimize the number of schemes supported in Rel-18 SRS enhancements to enable 8 Tx UL operation and 8T8R SRS for DL operation. Target usage includes antenna switching, codebook/non-codebook based SRS SRS comb offset hopping and cyclic shift hopping [109] Agreement Study the following for SRS enhancement to manage inter-TRP cross-SRS interference targeting TDD CJT via SRS interference randomization and/or capacity enhancement Randomized frequency-domain resource mapping for SRS transmission E.g., further enhancements to frequency hopping, comb hopping Randomized code-domain resource mapping for SRS transmission E.g., cyclic shift hopping/randomization, sequence hopping/randomization, per-hop sequence from a long SRS sequence Randomized transmission of SRS E.g., pseudo-random muting of SRS transmission for periodic and semi-persistent SRS Per-TRP power control and/or power control of one SRS towards to multiple TRPs SRS TD OCC Increasing the maximum number of cyclic shifts E.g., multiplying mask sequence to the legacy SRS sequence to effectively increase the maximum cyclic shifts Precoded SRS for DL CSI acquisition Enhanced signaling for flexible SRS transmission E.g., dynamic update of SRS parameters Partial frequency sounding extensions E.g., larger partial frequency sounding factor, starting RB location hopping enhancements, partial frequency hopping on other bandwidths corresponding to , besides the last bandwidth Enhanced configuration of SRS transmission to enable more efficient SRS parameter assignment E.g., configuration of (sequence index within a group) per SRS resource
E. g., configuration of cyclic shift per SRS port per SRS resource. Resource mapping for SRS transmission based on network-provided parameters or system parameters E.g., SRS resource mapping based on network-provided parameters (e.g., configurable indexes) or system parameters (e.g., slot index) Note: PAPR performance and maintaining DFT waveform property should be considered when deciding the enhancement for Rel-18. [110bis-e] Agreement Support at least one of the following for SRS interference randomization Randomized code-domain resource mapping for SRS transmission by introducing cyclic shift hopping / randomization to SRS resource Comb offset hopping for SRS The comb offset is determined pseudo-randomly as a function of time (e.g., slot index, symbol index) and/or NW configured ID with a certain UE-specific initialization. FFS: Other details, e.g., how the comb offset value is determined by the parameters for each SRS port of a SRS resource for a SRS transmission occasion. [110bis-e] Agreement For comb offset hopping for SRS and for randomized code-domain resource mapping for SRS transmission via cyclic shift hopping / randomization, further study the following: The hopping pattern (e.g., the pseudo-random sequence, time-domain granularity for hopping) The time-domain parameter and/or behavior (e.g., slot index, symbol index, re-initialization behavior) Network-configured ID for UE-specific initialization How the comb offset / cyclic shift value is determined by the parameters for each SRS port of a SRS resource for a SRS transmission occasion Potential issue on multiplexing with legacy UEs if ▇▇ ▇▇▇▇▇▇▇ and/or comb offset hopping are enabled Applicability to periodic/semi-persistent/aperiodic SRS Other details are not excluded [111] Agreement For SRS comb offset hopping and/or cyclic shift hopping, for each SRS port, FFS: Hopping pattern Support at least hopping based on slot index, OFDM symbol index FFS: Use of symbol group based on repetition factor FFS: Additional details on intra-slot hopping based on OFDM symbol index, inter-slot hopping based on slot index, per occasion of SRS resource FFS: Re-initialization periodicity Applicable to at least periodic/semi-persistent SRS with usage antennaSwitching FFS: Other types of SRS FFS: Configuring a subset of comb offsets / cyclic shifts for comb offset hopping / cyclic shift hopping, respectively FFS: Combined comb offset hopping and cyclic shift hopping, supporting both, or down selecting one [111] Agreement For SRS comb offset hopping and/or cyclic shift hopping, for each SRS port, the hopping pattern is determined based on:
Option 1: The hopping pattern is based on the pseudo-random sequence c(i), initialized with a network-configured ID. FFS: The ID could be cell ID , SRS sequence identity , C-RNTI, or a new ID FFS: The relation between the legacy group / sequence hopping and the new hopping [111] Agreement For SRS interference randomization, support one from the following options (to be decided in RAN1#112): Opt. 1: Cyclic shift hopping Opt. 2: Comb offset hopping Opt. 3: Both cyclic shift hopping and comb offset hopping FFS: details including whether to support separate and/or combined hopping FFS: details on UE capability and signaling [112] Agreement For SRS interference randomization, support: Opt. 3: Both cyclic shift hopping and comb offset hopping. At least the two features can be separately configured FFS: Combined cyclic shift hopping and comb offset hopping for a UE FFS: Separate or combined with SRS sequence group hopping / sequence hopping FFS: Associated UE capability [112] Agreement For SRS comb offset hopping and/or cyclic shift hopping, for each SRS port, the hopping pattern is determined based on the pseudo-random sequence c(i), initialized with one of the following IDs. Option 1: Reuse the SRS sequence identity . Option 2: Introduce new ID(s). FFS: the value range, one new ID or two separate new IDs, default ID(s) [112] Agreement For SRS comb offset hopping and/or cyclic shift hopping, the time-domain hopping behavior depends on at least the slot index within a radio frame and OFDM symbol index , and select at least one of the following options:
Option 1: Within a slot, hopping based on the repetition factor and symbol index that is the same across the R repetitions.
Option 2: Within a slot, hopping based on only the symbol index . Option 3: No intra-slot hopping. FFS: Time domain hopping behaviour further depends on system frame number (SFN) . FFS: reinitialization periodicity of N radio frames or reinitialization based on system frame number. FFS: Whether to adopt the same option(s) for comb offset hopping and cyclic shift hopping (if supported separately) FFS: At least support reinitialization at the beginning of each radio frame. [112bis-e] Agreement For SRS comb offset hopping and/or cyclic shift hopping, for a SRS resource, the hopping pattern initialization ID determined by , where is a new ID for cyclic shift hopping and/or comb offset hopping. The range of the new ID is from 0 to 1023 [112bis-e] Agreement For a SRS resource configured with comb offset hopping and/or cyclic shift hopping, If the repetition factor R = 1, within a slot, the time-domain hopping behavior depends on the OFDM symbol index of each symbol. If the repetition factor R > 1, For cyclic shift hopping, within a slot, the time-domain hopping behavior depends on the OFDM symbol index of each symbol. For comb offset hopping, within a slot, the time-domain hopping behavior depends on one of the following alternatives: Alt1: The OFDM symbol index of the first symbol across the R repetitions. Alt2: The OFDM symbol index of each symbol. Alt3: The OFDM symbol index of each symbol or the first symbol across the R repetitions based on configuration, and FFS configuration details. [112bis-e] Agreement For a SRS resource configured with comb offset hopping, if the repetition factor R > 1, within a slot, the time-domain hopping behavior depends on the OFDM symbol index l' of each symbol or the first symbol across the R repetitions based on RRC configuration, and FFS configuration details. UE can indicate whether it supports one or both the options. Details to be discussed in UE feature. [112bis-e] Agreement For SRS comb offset hopping / cyclic shift hopping, support reinitialization at the beginning of every N radio frame(s), where N ≥ 1. FFS: N is fixed or configurable. [112bis-e] Agreement Whether SRS comb offset hopping can be combined with one of group / sequence hopping on a SRS resource depends on UE feature/capability design. FFS: Whether SRS cyclic shift hopping can be combined with one of group / sequence hopping on a SRS resource depends on UE feature/capability design. FFS: UE feature/capability design details. [113] Agreement For SRS comb offset hopping / cyclic shift hopping reinitialization periodicity of N radio frame(s): N = 128 [113] Agreement Support configuring a subset of comb offsets when comb offset hopping is configured, and configuring a subset of cyclic shifts when cyclic shift hopping is configured. The subset configuration applies to all the port(s) in the SRS resource, and all the port(s) in the SRS resource has (have) the same hopping offset value on an OFDM symbol. This is a UE-optional feature. [113] Agreement For SRS cyclic shift hopping, support finer time-delay-domain granularity, e.g., , where can be randomly chosen from at each SRS transmission. Note: The finer granularity above only applies to the cyclic shift offsets when cyclic shift hopping is enabled. If a subset for cyclic shifts is configured, this feature cannot be configured. Above is a UE optional feature. [113] Agreement SRS comb offset hopping / cyclic shift hopping can be configured for aperiodic SRS. [113] Agreement Whether SRS cyclic shift hopping can be combined with one of group / sequence hopping on a SRS resource depends on UE feature/capability design. [113] Agreement SRS comb offset hopping and cyclic shift hopping can be configured for a SRS resource at the same time as a separate UE capability. No joint hopping scheme is supported. [114] Agreement When finer time-delay-domain granularity for SRS cyclic shift hopping is configured, K is 2 FFS (to be decided this week) Support of K=4 [114] Agreement For the SRS hopping formula in cyclic shift hopping or comb offset hopping except for SRS configured with TDM, let and : For cyclic shift hopping: , where , and , If cyclicShiftHoppingSubset is not configured, . If cyclicShiftHoppingFinerGranularity is not configured, and . If cyclicShiftHoppingFinerGranularity is configured, , and is the value configured by cyclicShiftHoppingFinerGranularity If cyclicShiftHoppingSubset is configured, denotes the th element of the configured subset, is the number of elements in the subset, and . For comb offset hopping: , where , and , if or UE is provided with combOffsetHoppingWithRepetition=Per-symbol; otherwise, is the OFDM symbol index of the first symbol across the R repetitions within the slot. If combOffsetHoppingSubset is not configured, , and . If combOffsetHoppingSubset is configured, denotes the th element of the configured subset, and is the number of elements in the subset. [114] Agreement When a subset of comb offsets for comb offset hopping is configured, and when a subset of cyclic shifts for cyclic shift hopping is configured, support the following option for configuring the subset S={S(0), S(1), …, S(z-1)} with , where for comb offset hopping and for cyclic shift hopping, and: Option 1b: S(0), S(1), …, S(z-1) are configured via a Z-length bitmap with S(i-1) being the i-th bit set as 1. [114bis] Agreement Adopt the text proposal for TS38.211 on cyclic shift / comb offset hopping ID notation:
Appears in 1 contract
Sources: R18 Mimo SRS Agreements