3GPP RAN WG2 Meeting #130 R2-2503866
St. Julian’s, Malta, 19th – 23rd May, 2025
Agenda Item: 8.11.1
Source: Huawei, HiSilicon
Title: Remaining RRC open issues in feature SBFD
Document for: Discussion, Decision
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Conclusions
The following proposals have been provided based on feedback to the above document:
[Proposals for easy agreement]
[Proposal for RRC-1] To use RRC signaling, e.g., additional field in RACH-ConfigCommon IE to indicate RO type for CBRA. (15/16 support, no need for meeting contributions on this issue.)
[Proposal for RRC-3] The value range of preamble transmission number threshold for fallback between legacy RO and additional RO is {n1, n2, n4, n6, n8, n10, n20, n50, n100, n200}. (Acceptable by 11/15, no strong preference for the alternative option. No meeting contributions are needed.)
[Proposal for RRC-4] RAN2 confirms that the separate Layer 3 measurement report for CSI-RS resources in SBFD symbol is not supported, no RRC spec impact is expected. (13/15 support. No contributions for May meeting are needed as the opponents only propose to wait for RAN4 conclusion.)
[Proposals for discussion]
[Proposal for RRC-2] RAN2 to decide whether ” Early UL synchronization with an LTM candidate cell” and/or ”RACH-based LTM” can be supported in SBFD symbols and the RRC signallings if to support. (based on companies’ meeting contributions, 11/16 companies prefer not to support.)
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3GPP TSG-RAN WG2 Meeting #130 R2-2504437
St Julian’s, Malta, 19 – 23 May, 2025
Agenda item: 8.11.1
Source: Samsung
Title: Remaining MAC open issues for Rel-19 SBFD
Document for: Discussion & Decision
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Conclusion
Based on the discussion above, the following proposals are made by Rapporteur:
Issue MAC-1: CSI-RS based CFRA with SBFD RO
Proposal 1: RAN2 to proceed with a working assumption that SBFD RO can be supported for both SSB-based and CSI-RS-based CFRAs.
Issue MAC-2: RA Resource Set Reselection at RO Type Switching
Proposal 2: RAN2 to discuss whether RA resource set change is introduced for RO type switching, considering the following alternatives:
Alt 1: RA resource set change is not supported for RO type switching.
Alt 2: RA resource set change is supported for RO type switching. FFS whether additional conditions/constraints should be applied or not.
Issue MAC-3: Msg 1 Repetition Number Fallback with SBFD RO
Proposal 3: RAN2 to discuss whether fallback of Msg 1 repetition number is supported with SBFD RO, considering the following alternatives:
Alt 1: Fallback of Msg1 repetition number is not supported with SBFD RO.
Alt 2: Fallback of Msg1 repetition number is supported with SBFD RO. FFS whether additional conditions/constraints should be applied or not.
Issue MAC-4: RO Type Signalling in LTM Cell Switch Command MAC CE
Proposal 4: If SBFD RO is supported for RACH-based LTM, RAN2 to discuss how to modify the LTM Cell Switch Command MAC CE for RO type signalling.
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