3GPP TSG-RAN WG1 Meeting #121	R1-2503274
St Julian’s, Malta, May 19th – 23rd, 2025

Agenda Item:	9.15.12
Source:	Huawei, HiSilicon
Title:	UE features for low band CA via switching
Document for:	Discussion and Decision

Conclusions
In this contribution, the following are proposed:
Proposal 1: For low NR band carrier aggregation via switching, one FG 68-1 is introduced with the following:
Component: 
Support of semi-static carrier switching between two inter-band carriers with a configured switching pattern in which a UE is not expected to be operated simultaneously with both carriers for any downlink reception and uplink transmission with the required switching period and uplink TA taken into account.
FFS: others
Note:
Note: It is up to RAN2 to determine whether the FG can be combined with RAN4 FG x-x as single capability signal.
Proposal 2: For low NR band carrier aggregation via switching, the prerequisite of FG 68-1 is FG 6-5 and the switching period introduced in RAN4.
Proposal 3: For low NR band carrier aggregation via switching, the granularity of FG 68-1 is per BC.
Optional with capability signaling
Proposal 4: The table in the Appendix is taken as the starting point for further UE feature discussion on Rel-19 low band CA via switching.

3GPP TSG-RAN WG1 Meeting #121	R1-2503326
Malta, Malta, May 17 – 21, 2025

Agenda Item:	9.15.12
Source:	TELUS
Title:	UE features for low band CA via switching
Document for:	Discussion and Decision

Conclusions
In this contribution, the following are proposed:
Proposal 1: For Low NR band carrier aggregation via switching, one FG 68-1 is introduced with the following component:
Component: 
Support of semi-static carrier switching between two inter-band carriers with a configured switching pattern in which a UE is not expected to be operated simultaneously with both carriers for any downlink and uplink processing.
FFS: others
Note:
Note: Whether the FG can be combined with RAN4 FG x-x as single capability signal is up to RAN2 for signalling design
Proposal 2: For Low NR band carrier aggregation via switching, the prerequisite of FG 68-1 is FG 6-5 and the switching period introduced in RAN4.
Proposal 3: For Low NR band carrier aggregation via switching, the granularity of FG 68-1 is per band combination.
Optional with capability signalling
Proposal 4: The table in the Appendix is taken as the starting point for further UE feature discussion on Rel-19 low band CA via switching.

3GPP TSG RAN WG1 Meeting #121			R1-2503335
St Julian’s, Malta, 19-23 May, 2025

Source:	ZTE Corporation, Sanechips
Title:	Discussion on UE features for Rel-19 low band carrier via switching
Agenda item:	9.15.12
Document for:	Discussion and Decision

Conclusion
In this contribution, we discuss and analyse Rel-19 UE features for carrier switching with the following proposal.
Proposal 1: Introduce the following UE feature for Rel-19 carrier switching.

3GPP TSG RAN WG1 #121		                                               R1-2503396
St Julian’s, Malta, May 19th – 23rd, 2025

Source: 	vivo
Title:	Discussion on UE features for Low band carrier aggregation via switching
Agenda Item:	9.15.12
Document for:	Discussion and Decision

Conclusion
In this contribution, the proposal is summarized as follows: 
Proposal 1: Introduce a UE capability supporting Low band CA via switching which includes a component that a restriction of maximum X switch(es) within Y slot(s).

Proposal 2: The UE feature is list in Table 1.
Table 1 UE feature for LB CA via switching

3GPP TSG RAN WG1 #121	R1- 2503409
St Julian, Malta, 19 – 23 May 2025

Agenda item:		9.15.12
Source:	Nokia
Title:	LB-CA switching UE features
Document for:		Discussion and Decision

Proposal
Proposal 1: Consider the following new feature group for LBCA with switching UE features discussions.

3GPP TSG RAN WG1 #121		R1-2503602	
St. Julian’s, Malta, May 19th – 23rd, 2025
Agenda item:	9.15.12
Source:	Samsung
Title:	UE features for low band CA via switching
Document for:	Discussion and Decision

Conclusion

Proposals from this contribution are summarized as follow.

Proposal 1: Support at least one FG for low band CA via switching.
FFS: Whether the UE feature is discussed in RAN1 or RAN4.

3GPP TSG RAN WG1 #121                                                                                       R1-2503659
St Julian’s, Malta, May 19th – 23th, 2025

Agenda Item:	9.15.12
Source:	Lenovo
Title:	Discussion on UE feature for low band CA via switching
Document for:	Discussion & Decision

Conclusion

In this contribution, we focus on the UE feature issues for Rel-19 low band CA via switching and have below observations and proposals:
Proposal 1: Introduce a feature group for Rel-19 low band CA via switching with components at least including those in the WID.
Proposal 2: UE supported maximum number of switches within 10, 20 or 40 slots is included in the components.
Proposal 3: UE supported HARQ-ACK codebook types is included in the components.
Proposal 4: Below table is proposed for UE feature discussion. 
Table 1: FG for Rel-19 low band CA via switching

3GPP TSG RAN WG1 #121		R1-2504219
St Julian’s, Malta, May 19th – 23rd, 2025

Source:	OPPO
Title:	   Discussion on UE feature for low-band CA via switching
Agenda Item:	9.15.12
Document for:	Discussion and Decision

Conclusion
This contribution concludes with following proposals:
Proposal 1: The components of the main FG for LBCA at least include following.
Component 1: Semi-static configuration of periodic switching pattern in bitmap for the switching between the following two cases, where FDD carrier 1 is PCell and SDL carrier 2 is SCell.     
Case 1: Tx/Rx on FDD carrier 1 and no Rx on SDL carrier 2
Case 2: Rx on SDL carrier 2 and no Tx/Rx on FDD carrier 1
Component 2: The time unit of the semi-statically configured switching pattern is 1ms slot, and the switching pattern periodicity is 40 1ms-slots.     
Proposal 2: The main LBCA FG has no prerequisite FG.  
Proposal 3: The granularity of LBCA FG is per BC. 
Proposal 4: The FDD/TDD differentiation for LBCA FG is marked as N/A. 
Proposal 5: The FR1/FR2 differentiation for LBCA FG is marked as FR1 only. 
A preliminary UE feature table based on above discussions is given in the Appendix.   

3GPP TSG RAN WG1 #121		             R1-250xxxx
St Julian’s, Malta, May 19th – 23rd, 2025

Agenda Item:	9.15.12
Source:	Apple
Title:	On UE features for Rel-19 low band carrier aggregation via switching
Document for:	Discussion/Decision

Conclusion
In this contribution, based on the agreements so far, we made the following proposal on RAN1 related UE FG for LB CA via switching:
Proposal 1: For Low NR band carrier aggregation via switching, one FG XX-YY is introduced with the following components:
Component 1: Semi-static switching between two inter-band FDD carrier 1 and SDL carrier 2 with no simultaneous operation on the two bands and SCS of 15kHz on both the carriers
Component 2: Slot-level granularity to operate on only one band within a slot
Component 3: Switching gap location on SDL carrier for the case when switching from SDL carrier 2 to FDD carrier 1
FFS: Other components 

3GPP TSG RAN WG1 #121			R1-2504430
St Julian’s, Malta, May 19th – 23th, 2025

Agenda item:	9.15.12
Source: 	Qualcomm
Title: 	UE features for low band CA via switching
Document for:	Discussion and Decision

TDoc file conclusion not found

3GPP TSG RAN WG1 #121			R1-2504441
St Julian’s, Malta, May 16th – 23rd, 2025

Agenda Item:	9.15.12
Source:	Ericsson
Title:	UE features for low band CA via switching
Document for:	Discussion, Decision
1	

Conclusion
In the previous sections we made the following observations: 
Proposal 1	Support a basic feature group for the lowband CA via switching feature with mandatory support for the switching gap located on the “switch from” carrier. If Alt-1 is supported in the RAN1#120bis agreement, there is no need to define additional optional feature groups.
 

3GPP TSG RAN WG1 #121                                                       R1-2504484
St Julian’s, Malta, May 19th – 23th, 2025
 
Agenda item:	9.15.12
Source: 	MediaTek Inc.
Title: 	UE features for low band CA via switching
Document for:	Discussion and decision

TDoc file conclusion not found

3GPP TSG RAN WG1 #121			R1-2504533
St Julian's, Malta, 19 - 23 May, 2025

Source:	NTT DOCOMO, INC.
Title:	Discussion on UE features for Low band carrier aggregation via switching
Agenda Item:	9.15.12
Document for: 	Discussion and Decision

Conclusion
In this contribution, we discussed on UE features for low NR band carrier aggregation via switching from RAN1 perspective. We provided following observations:
Observation 1: There is no necessary RAN1 UE feature for LBCA via switching so far according to RAN1 agreements made at RAN1#120bis meeting.
Observation 2: It is generally preferable to have no RAN1 UE feature for LBCA via switching to minimize the RAN1 impact and operational complexity.

3GPP TSG RAN WG1 #121			R1-2504671
St Julian’s, Malta, May 19th – 23th, 2025

Agenda item:	9.15.12
Source: 	Moderator (NTT DOCOMO, INC.)
Title: 	Summary of discussion on Rel-19 NR UE features for low band CA via switching
Document for:	Discussion and Decision

Conclusions
TBD

TDoc file unavailable