RAN4 Meeting Summary November 2021
Explore the discussions from the 3GPP TSG-RAN4 electronic meeting held on the 1st and 12th of November 2021. Topics covered include RRM requirements for NR SDT, BFD/BFR requirements, decision procedures, RA-SDT, and CG-SDT. The agreements and considerations for each issue are outlined in detail.
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Presentation Transcript
3GPP TSG-RAN4#101-e Electronic meeting, 1st 12th, November, 2021 R4-2120338 WF on RRM requirements for NR SDT in INACTIVE state ZTE
BFD/BFR requirements for SDT Agreements: RAN4 does not introduce BFD/BFR requirements for SDT, unless there is RAN1/2 decision to support BFD/BFR for SDT
RRM requirements for SDT decision procedure Issue 2-1-1: Whether or not RAN4 to introduce any RRM requirements for SDT decision procedure? Option 1: Yes Option 2: No, SDT decision procedure does not have specs impact Agreements: TBD
RRM requirements for SDT decision procedure (Contd) How would the validity of the SDT decisions for subsequent transmission impact RAN4 specs? Option 1: No RAN4 specs impact Option 2: Wait until RAN2 decisions Agreement: TBD
RRM requirements for RA-SDT Agreement: RAN4 does not introduce any new UE RRM requirements for RA-SDT RAN4 to clarify that UE shall meet the existing requirements when performing 2-step/4-step RA-SDT.
RRM requirements for CG-SDT Agreements: RAN4 introduce requirements for CG-SDT in a similar approach to LTE PUR RAN4 reuse the existing UE initial transmission requirements for CG-SDT
RRM requirements for CG-SDT (Contd) Issue 2-3-5: If a UE is allowed for CG-SDT transmission, which sync requirements should it satisfy prior to the transmission? Option 1: Existing UE sync requirements towards the serving cell Option 2: New UE sync requirements towards the serving cell for CG-SDT Option 3: FFS, but please state factors which make it not clear Agreement: TBD Continue discussion in the next meeting with the following two options: Option 1 Option 3
RRM requirements for CG-SDT (Contd) Issue 2-3-6: Which WG should be responsible to decide the two window sizes and two threshold values for TA validation? Option 1: RAN4 Option 2: RAN2 Option 3 (new): RAN4 defined two window sizes and RAN2 defines two thresholds for TA validation. Agreement: Option 3
Reference Tdocs R4-2118590 RRM requirements for SDT, ZTE R4-2118591 Workplan for SDT RRM requirements, ZTE R4-2118961 On RRM core requirements for SDT, R4-2119066 Overview of RRM impact of Small Data Transmissions, Ericsson R4-2119067 Overview of TA validation requirements for Small Data Transmissions, R4-2119364 Initial discussion on RRM impacts of SDT, Nokia, Nokia Shanghai Bell Ericsson Huawei, Hisilicon
