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Summary of Agreements by Topic

Sidelink Positioning Reference Signal ​

  1. Sequence Generation: SL PRS sequence is generated using Gold sequence based on slot number, symbol number, and a parameter, with initialization based on DL PRS. ​
  2. Multiplexing: Comb-based multiplexing is supported for dedicated resource pools, while TDM-based multiplexing is not supported for shared resource pools. ​
  3. Comb Sizes: Supported comb sizes include 2, 4, and 6 for dedicated resource pools, and comb size 1 for shared resource pools. ​ Comb sizes greater than 12 are not supported. ​
  4. Patterns: Fully staggered patterns with (M, N) = (6, 6) are supported for dedicated resource pools, while partially staggered patterns are supported for specific (M, N) pairs without repetition in a slot. ​
  5. Power Control: Open-loop power control can use DL pathloss, SL pathloss, or both, with SL pathloss reference options including SL PRS or PSCCH DMRS. ​
  6. Resource Definition: SL PRS resource refers to a time-frequency resource within a slot of a dedicated SL PRS resource pool, characterized by resource ID, comb offset, starting symbol, number of symbols, and frequency domain allocation. ​
  7. Bandwidth Alignment: SL PRS bandwidth in a dedicated SL PRS resource pool matches the resource pool bandwidth in RBs. ​
  8. Transmission Rules: SL PRS and associated PSCCH must be in the same slot. ​

Measurements and Reporting for SL Positioning ​

  1. Measurement Types: Support SL-based RSTD, Rx-Tx time difference, RTOA, AoA, and RSRPP measurements for the first path and optionally additional paths. ​
  2. Definitions: SL RTOA is defined relative to SFN0 or DFN0 based on synchronization source; SL AoA is defined in global and local coordinate systems; SL RSTD is the relative timing difference between two UEs. ​
  3. Reporting: Higher-layer signaling supports sidelink positioning measurement report and report triggering, with anchor UE location information provided to LMF or UE. ​
  4. Assistance Information: Anchor UE location and quality information, along with LOS/NLOS indicators, are included in reports.
  5. Timestamp Information: Timestamp includes SFN and slot number, with optional synchronization reference source indication. ​
  6. Multiple ARP-IDs: SL PRS Rx UE can report measurements for multiple Rx ARP-IDs for the same or different resources from the same Tx UE in a single report. ​

Resource Allocation for SL Positioning Reference Signal ​

  1. Schemes: UEs can perform Scheme 1 (network-centric) or Scheme 2 (UE autonomous), applicable to all resource pools, with sensing-based or random selection allowed in Scheme 2. ​
  2. Dedicated Resource Pools: Slot determination follows legacy SL communication pools, with channels under discussion (e.g., PSFCH). ​
  3. Triggering: SL PRS transmission triggering is supported via higher layers or lower-layer signaling (e.g., SCI or SL MAC-CE). ​
  4. Periodic and Non-Periodic Reservations: SL PRS transmissions with and without periodic reservations are supported. ​
  5. Congestion Control: SL PRS delay budget replaces packet delay budget in resource selection for dedicated SL PRS resource pools. ​

NR DL and UL Carrier Phase Positioning ​

  1. Measurements: Introduce DL carrier phase (CP), DL carrier phase difference (CPD), and UL carrier phase (CP) measurements. ​
  2. Definitions: NR DL RSCP and NR UL RSCP are defined as the phase of the channel response at the i-th path delay derived from DL PRS and UL SRS signals, respectively. ​
  3. Reporting: Support reporting carrier phase measurements together with legacy positioning measurements (e.g., RSTD, RTOA). ​
  4. Enhancements: Support integer ambiguity resolution methods and reporting carrier phase measurements across multiple frequencies or subcarriers. ​

Low Power High Accuracy Positioning (LPHAP) ​

  1. SRS Configuration: SRS positioning validity area consists of cells configured in the same band and carrier, with common parameters across cells. ​
  2. Timing and Spatial Relation: UL timing options include maintaining TA from the last serving cell, autonomous adjustment, or maintaining multiple TA values. ​
  3. Power Control: Pathloss RS can be absent or provided in the configuration, with UE behavior for invalid pathloss RS under study. ​
  4. Periodicity: Introduced 20480ms periodicity for positioning SRS in RRC_INACTIVE state. ​

Bandwidth Aggregation for Positioning Measurements ​

  1. PRS Aggregation: PRS bandwidth aggregation across PFLs requires alignment in numerology, comb size, and phase continuity, with joint measurement and reporting supported. ​
  2. SRS Aggregation: SRS bandwidth aggregation across carriers requires alignment in spatial relation, comb size, and phase continuity, with joint measurement and reporting supported.
  3. Enhancements: Support periodic and semi-persistent positioning SRS for bandwidth aggregation, with power control enhancements under study. ​

Positioning for RedCap UEs ​

  1. Frequency Hopping: Support Rx frequency hopping for DL PRS with measurement gaps and UL SRS Tx hopping. ​
  2. Scope: Positioning enhancements for RedCap UEs include FR1 and FR2. ​
  3. SRS Configuration: Support SRS for positioning frequency hopping using a configuration separate from existing BWP configurations. ​

General Agreements

  1. SL CA Support: SL PRS transmission/reception in a band configured with SL CA is supported with new UE capabilities. ​
  2. SCI Format Handling: Clarifications added for SCI format handling in sidelink resource allocation. ​
  3. Reporting Granularity: Expanded granularity factor values for timing measurements to include {-3, -4, -5, -6}. ​
  4. MAC Agreements: No new RRC parameter is needed for minimum time gap between SL PRS and PSFCH reception. ​