3 GPP TSGRAN WG 494 eBis Meeting Electronic
3 GPP TSG-RAN WG 4#94 -e-Bis Meeting Electronic Meeting, 20 – 30 Apr. , 2020 R 4 -2005637 WF on remaining issues for NR V 2 X system parameters vivo, LGE. . .
Background • In this meeting, the progress for the following open issues is captured in this WF. 1) The principles of introducing NR V 2 X licensed bands for SL operation • The synchronization mechanism of Uu and SL in the TDD licensed bands 2) The principles of introducing channel bandwidths for NR V 2 X licensed bands • 30 MHz issue for NR V 2 X licensed band n 38
NR V 2 X band for SL operation • Proposal 1: Introduce n 79 for NR V 2 X SL operation with the conditions that the entire band is allocated for SL operation in a particular region or the SL operation is in sync with the non-V 2 X operation in the same band. (Supported by CMCC, Huawei, vivo, CATT, OPPO) • Since no company is against this proposal, proposal 1 is suggested to be approved in this meeting. • If no company is against this proposal, we will make it an agreement in this meeting. • The allowance introduction of NR SL partial operation in TDD licensed band is related to next agenda as “The sync mechanism of Uu and SL in the same TDD bands”. • If RAN 4 make consensus for the sync. mechanism of Uu and SL, the n 79 will be introduced for NR V 2 X SL operation within the entire band or partial band with non-V 2 X operation in same band.
The sync mechanism of Uu and SL in the same TDD bands • Proposals (For clarification, Option 1~3 are bonded. ) • Option 1: Divide NR V 2 X licensed TDD bands (partially used for SL) into two frequency spectrums: one used for Uu and the other used for SL. • Option 2: The division of this NR V 2 X licensed TDD bands is up to BS implementation or captured in the spec considering the requirements of Uu and SL traffic. • Option 3: For the synchronous operation between Uu and SL in the same licensed TDD bands, NR SL uses network as synchronization reference source. (supported by vivo, Huawei, Ericsson, CATT, Futurewei, VDF) • Option 4: In rel-16, only allow that the entire band is allocated for SL operation since the NR UL transmission will be impacted to the SL reception in the length of TA. • In the first round discussion, Option 3 was supported by the majority of companies. • In the second round, we can at least sort out the specific issues or impacts to the RF/RRM core requirements for the scenario NR licensed bands partially used for SL operation. (see the slide 5 for RF/RRM impact)
The sync mechanism of Uu and SL in the same TDD bands (cont. ’) • At first, need to clarify which scenario is feasible in Rel-16 • Scenario 1: UE capable of simultaneous transmission for both NR UL and NR SL in same TDD band • Scenario 2: UE capable of only transmission of NR SL in same TDD band • In scenario 1, RAN 4 need to specify additional UE RF requirements as follow § RAN 4 need define Band combinations and related Tx RF requirements for intra-band NR V 2 X_n 79 A-n 79 A or NR V 2 X_n 38 A-n 38 A ü MOP, MPR for intra-band V 2 X operation, A-MPR for specific regulation for intra-band V 2 X operation, configured Tx power for exceed MOP and scaling of NR V 2 X power… • In scenario 2, üNot need additional RF requirements • Based on this, RAN 4 only allow single SL operation of NR V 2 X UE at licensed band in Rel-16.
Channel bandwidths for NR V 2 X licensed bands • Remove 30 MHz for NR V 2 X licensed band n 38 in TR 38. 886. • Principle of introducing channel bandwidths for NR V 2 X licensed bands: • Channel bandwidths defined for NR V 2 X licensed band should be a subset of UE channel bandwidths for the same licensed band in NR. • For Rel-16, channel bandwidths for NR V 2 X licensed bands should follow NR UE channel bandwidth definition. • If operators do have a request for introducing new channel bandwidths for NR V 2 X licensed bands, it can be treated in the enhanced sidelink WI for collecting operators’ request and define additional RF requirements related to these new channel bandwidths in Rel-17.
References • [1] R 4 -2003024, NR V 2 X licensed frequency bands for SL operation, CMCC • [2] R 4 -2004744, On synchronization scenario for NR V 2 X in licensed band, Huawei, Hi. Silicon • [3] R 4 -2003676, Discussion on sync mechanism between SL and Uu in NR V 2 X licensed TDD bands, vivo • [4] R 4 -2003675, Further discussion on channel bandwidth for NR V 2 X licensed bands, vivo
- Slides: 7