Understanding CBM and IBM Applicability for FR2 Inter-Band CA Configurations
Explore the discussion on the applicability of Coordinated Beam Management (CBM) and Inter-Band Mobility (IBM) for different Carrier Aggregation (CA) configurations in the context of 3GPP meetings. Key topics include limitations on CBM support, IBM applicability across CA configurations, and proposals for specifying requirements in the specifications to address these issues.
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Presentation Transcript
3GPP TSG-RAN WG4 Meeting #97-e Electronic Meeting, Nov. 2nd Nov. 13th, 2020 Agenda Item: 12.3.2.1.1 R4-2016915 WF on Applicability of CBM/IBM for different CA Samsung [, ]
Background In Rel-16, two kinds of UE beam management capabilities for FR2 inter-band CA were introduced, i.e. CBM and IBM, but it was not specified how to apply CBM/IBM to a particular CA configuration In RAN#89e meeting, It s agreed to specify CBM/IBM applicability in Rel-17 as shown in the WID of Rel-17 NR RF enhancements for FR2 (RP-202107) Inter-band DL CA enhancements [RAN4 RF/RRM] Agree a method how applicable CBM/IBM information is captured into specification for a particular CA configuration. Agree how it is decided whether a certain CA configuration is assuming CBM or IBM based requirements (for-example is applicability based on operator request or some general rule or are all CA configurations applicable for both CBM and IBM). In this meeting, CBM/IBM applicability is discussed in email thread 135 based on companies contributions [1~9] and summarized in [10]. Some discussion outcome [11] from email thread 136 is also taken into account
WF on CBM applicability Issue 2-1: whether CBM is only applicable for CA configurations with same freq. group Option 1: Yes, CBM can only support CA configurations within same frequency group Option 2: No, there is not restrictions which CA configurations CBM UE can support Option 3: Other Agreement [CBM can only support CA configurations within same frequency group]
WF on IBM applicability Issue 2-2: whether IBM is applicable for all CA configurations Option 1: Yes, by default IBM is applicable for all CA configurations Option 2: No, IBM is not by default applicable for all CA configurations Option 3: Other Agreement IBM UE capability is applicable for all CA configurations FFS if IBM should be the baseline (i.e., if CBM can be considered as an incapability signaling for the UE to use for certain allowed band combinations) FFS if the same IBM requirements apply to all CA configurations
WF on how to state in specification Open issues Issue 2-3 on frequency group proposal: The frequency group term shall not be defined in specification Issue 2-4 on applicability of CBM/IBM requirements Proposal: Clearly state in specification whether IBM and/or CBM requirements are defined for certain band combination Issue 2-5 on applicability of CBM/IBM capability Proposal: Study and introduce per-band combination parameter Fs,inter in the specification as a reference of applicability for IBM/CBM Agreements on frequency group frequency group term shall not be defined in specification on applicability of CBM/IBM requirements If either CBM or IBM is concluded as infeasible for certain band combinations, it is reasonable to clearly state in the spec that only the requirements of feasible BM apply to these band combinations. If both CBM and IBM are concluded as feasible for certain band combinations, IBM/CBM is up to UE s capability. on applicability of CBM/IBM capability Detailed approach to justify applicability of CBM capability is TBD. Further discuss approaches including Fs,inter parameter in next meeting.
WF on frequency separation class Issue 2-6: whether separation class extends to be indicated per band combination per receiving chain for L+L and H+H CA combinations Option 1: New UE capability for separation class is only introduced per band combination Option 2: New UE capability for separation class is introduced per band combination per receiving chain Option 3: separation class is not indicated per band combination per receiving chain, no new UE capability is introduced Agreement Further study whether and/or how frequency separation class is introduced for inter-band CA based on CBM and IBM
Reference 1. R4-2014724, Discussion on Rel-17 FR2 inter-band CA, Samsung 2. R4-2014912, More on FR2 Inter-band DL CA, Apple 3. R4-2015327, Discussion on FR2 inter-band DL CA enhancements, vivo 4. R4-2014923, Inter-band DL CA CBM band pairs for FR2 Rel-17, Qualcomm 5. R4-2014515, FR2 interband CA CBM vs IBM, Nokia, Nokia Shanghai Bell 6. R4-2014586, CBM IBM Applicability for Inter-Band DL CA, Intel 7. R4-2015348, Discussion on Rel-17 FR2 inter-band DL CA, OPPO 8. R4-2016344, Views on applicability of CBM/IBM for different CA configurations, Ericsson, Sony 9. R4-2016523, On Rel-17 inter band DL CA_FR2, Huawei, HiSilicon 10. R4-2016637, NR_RF_FR2_req_enh2_Part_1 1st round summary, Moderator(Nokia) 11. R4-2016638, NR_RF_FR2_req_enh2_Part_2 1st round summary, Moderator(Qualcomm)
