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Content for  TS 38.300  Word version:  18.0.0

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G Components of Mobility Latency  $ Change history 

 

G  Components of Mobility Latency |R18|  p. 256

HO interruption time for L1/L2-based inter-cell mobility is the time from UE receives the cell switch command to UE performs the first DL/UL reception/transmission on the indicated beam of the target cell.
For Rel-18, RAN2 assumed the latency of the mobility procedure is characterized by the terms illustrated in Figure G-1.
Reproduction of 3GPP TS 38.300, Fig. G-1: Components of Mobility Latency
Figure G-1: Components of Mobility Latency
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Each component of mobility latency is described in the Table below, the values of which are specified in TS 38.133.
Component Meaning
TRRCProcessing time for RRCReconfiguration carrying candidate configurations
TcmdTime for processing L1/L2-command (HARQ and parsing)
TLTM-RRC-processingEarly ASN.1 decoding and validity/compliance check
TLTM-ProcessingUE processing including applying target cell parameters and L1/L2 change
Tfirst-RSTime for fine tracking and acquiring full timing information
TRS-procTime for SSB processing
TLTM-IUInterruption uncertainty in acquiring the first UL transmission
TRARTime for RAR delay
Tfirst-dataTime for UE performs the first DL/UL reception/ transmission on the indicated beam of the target cell, after RAR
For Rel-18, RAN2 assumed that the latency of the RACH-based and RACH-less LTM procedure is characterized by the terms illustrated in Figure G-2 and Figure G-3. The overall mobility latency of LTM can be largely reduced by early synchronization procedure.
Reproduction of 3GPP TS 38.300, Fig. G-2: Mobility Latency for RACH-based LTM
Figure G-2: Mobility Latency for RACH-based LTM
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Reproduction of 3GPP TS 38.300, Fig. G-3: Mobility Latency for RACH-less LTM
Figure G-3: Mobility Latency for RACH-less LTM
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$  Change history  p. 258

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