3GPP TSG-RAN WG4 Meeting #98-e Electronic Meeting Summary
In the 3GPP TSG-RAN WG4 Meeting #98-e Electronic Meeting, discussions were held on various topics such as NR RRM enhancements, BWP switching on multiple CCs, UL spatial info switch, and more. Issues regarding BWP switching in core and performance parts were addressed, along with considerations for scenarios, test cases, and network configurations. The meeting aimed to refine specifications and clarify requirements for efficient BWP switching on multiple carriers while meeting deadlines and UE capabilities.
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3GPP TSG-RAN WG4 Meeting #98-e Electronic Meeting, 25, Jan-05, Feb. , 2021 R4-21#### WF on R16 NR RRM enhancements - BWP switching on multiple CCs, UL spatial info switch Intel Corporation, Apple
BWP switching on multiple CCs in core part BWP switching on multiple CCs in core part Issue 1-1-1: Scenario for RRC based BWP switch on multiple CCs Wait for the feedback from RAN2. Issue 1-1-2: Clarification for N for DCI-based simultaneous BWP switch on multiple CCs Note: may be updated later based on corresponding CR discussion. Option 1: A clarification is added to the description of N where it is hinted that the maximum value of N that can be supported is depending on TBWPswitchDelay (bwp-SwitchingDelay-r16), incremental switching delay D, and whichever applies of minimum scheduling offset on DL (k0), HARQ ACK-timing (k1), and minimum scheduling offset on UL (k2). Option 2: Further discuss how to refine. A clarification and editor note are added to the description of N: The number of carriers N that UE can switch BWPs on while still meeting deadlines, if any, related to allocations on downlink, uplink, or transmission of HARQ-ACK, may depend on network configuration, triggering option, and reported UE capabilities. Editor s Note: The requirements are defined in DCI-agnostic manner, if RAN1 defines something that makes Dormant switching time/interruption to always be absorbed into WUS gap, RAN4 can revise the specification text accordingly.
BWP switching on multiple CCs in performance BWP switching on multiple CCs in performance part(1) part(1) Issue 3-1-1: Whether to define DCI/Timer based FR1+FR2 simultaneous BWP switch test case Note: may be updated later based on 2nd round discussion. Option 1 : Yes Option 2: No Do not define DCI/Timer based FR1+FR2 simultaneous BWP switch test case Issue 3-1-2: Whether to define DCI/Timer based non-simultaneous BWP switch test case Not to define DCI/Timer based non-simultaneous BWP switch test case.
BWP switching on multiple CCs in performance BWP switching on multiple CCs in performance part(2) part(2) Issue 3-1-3: whether to define RRC based BWP switch on multiple CCs test case To be discussed after receiving RAN2 response Issue 3-1-4: TC4: DCI-based and Timer-based simultaneous Active BWP Switch on multiple CCs on FR2 in SA Cell configuration: NR FR2 PCell + NR FR2 SCell + NR FR2 SCell
UL Spatial Relation Info Switch in core part(1) Background PUCCH Spatial Relation Info IE also has Pathloss Reference RS Spatial relation info switch for PUCCH may also change Pathloss Reference RS Existing known condition is based on associated DL-RS Existing delay requirements for spatial relation info switch for PUCCH do not consider change to PL-RS
UL Spatial Relation Info Switch in core part(2) Known condition definition update to include PL-RS Option 1: Update known condition based on whether DL-RS and PL-RS are in same TCI chain If DL-RS and PL-RS are in same TCI chain known condition is based on DL-RS If DL-RS and PL-RS are not in same TCI chain known condition is based on DL-RS and PL- RS Option 2: Do not update known condition Do not update known condition
UL Spatial Relation Info Switch in core part(3) Delay requirements for MAC CE based UL spatial relation switch for PUCCH Option 1: Define additional delay for PL-RS activation in UL spatial relation switch Option 1: Refer to section 8.14 for additional delay due to PL-RS switch in UL spatial relation switch Option 3: no extra delay is added. Option 2: Longer delay is expected when PL-RS and DL-RS in the UL spatial relation are changed simultaneously
