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Content for  TS 37.340  Word version:  18.1.0

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A  Layer 2 handling for bearer type changep. 132

This clause provides for information an overview on L2 handling for bearer type change in MR-DC, with and without a security key change due to a change of the termination point.
Bearer type change from row to col MCG Split SCG
no change of termination point (no key change) change of termination point (key change) no change of termination point (no key change) change of termination point (key change) no change of termination point (no key change) change of termination point (key change)
MCGN/APDCP: Re-establish
MCG RLC: See Note 1
MCG MAC: See Note 1
SCG RLC: No action
SCG MAC: No action
PDCP: Reconfigure
MCG RLC: No action
MCG MAC: No action
SCG RLC: Establish
SCG MAC: Reconfigure
PDCP: Re-establish
MCG RLC: See Note 1
MCG MAC: See Note 1
SCG RLC: Establish
SCG MAC: Reconfigure
PDCP: Recovery
MCG RLC: See Note 3
MCG MAC: Reconfigure
SCG RLC: Establish
SCG MAC: Reconfigure
PDCP: Re-establish
MCG RLC: See Note 3
MCG MAC: Reconfigure
SCG RLC: Establish
SCG MAC: Reconfigure
SplitPDCP: Recovery
MCG RLC: No action
MCG MAC: No action
SCG RLC: See Note 4
SCG MAC: Reconfigure
PDCP: Re-establish
MCG RLC: See Note 1
MCG MAC: See Note 1
SCG RLC: See Note 4
SCG MAC: Reconfigure
N/APDCP: Re-establish
MCG RLC: See Note 1
MCG MAC: See Note 1
SCG RLC: See Note 1
SCG MAC: See Note 1
PDCP: Recovery
MCG RLC: See Note 3
MCG MAC: Reconfigure
SCG RLC: No action
SCG MAC: No action
PDCP: Re-establish
MCG RLC: See Note 3
MCG MAC: Reconfigure
SCG RLC: See Note 1
SCG MAC: See Note 1
SCGPDCP: Recovery
MCG RLC: Establish
MCG MAC: Reconfigure
SCG RLC: See Note 4
SCG MAC: Reconfigure
PDCP: Re-establish
MCG RLC: Establish
MCG MAC: Reconfigure
SCG RLC: See Note 4
SCG MAC: Reconfigure
PDCP: Reconfigure
MCG RLC: Establish
MCG MAC: Reconfigure
SCG RLC: No action
SCG MAC: No action
PDCP: Re-establish
MCG RLC: Establish
MCG MAC: Reconfigure
SCG RLC: See Note 1
SCG MAC: See Note 1
N/APDCP: Re-establish
MCG RLC: No action
MCG MAC: No action
SCG RLC: See Note 1
SCG MAC: See Note 1
NOTE 1:
For EN-DC and NGEN-DC MCG, NE-DC SCG: the MAC/RLC behaviour depends on the solution selected by the network. It can be PCell handover (for EN-DC and NGEN-DC) or PSCell change (for NE-DC), which triggers MAC reset and RLC re-establishment. Alternatively, the logical channel identity can be changed, either via RLC bearer release and add for the same DRB (including RLC re-establishment), or via reconfiguration of the RLC bearer with RLC-re-establishment.
For EN-DC and NGEN-DC SCG, NE-DC MCG, NR-DC MCG and SCG: the MAC/RLC behaviour depends on the solution selected by the network. It can be reconfiguration with sync, with MAC reset and RLC re-establishment. Alternatively, the logical channel identity can be changed via RLC bearer release and add.
NOTE 2:
Void
NOTE 3:
For EN-DC and NGEN-DC: Re-establishment and release. For NE-DC and NR-DC: Release.
NOTE 4:
For NE-DC: Re-establishment and release. For EN-DC, NGEN-DC and NR-DC: Release.
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