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Content for  TS 38.331  Word version:  17.3.0

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6.3.6  MBS information elements |R17|p. 1142

 –  CarrierFreqListMBSp. 1142

The IE CarrierFreqListMBS is used to inform network of the frequencies on which the UE is receiving or interested to receive MBS broadcast service via a broadcast MRB.
CarrierFreqListMBS information element
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 –  CFR-ConfigMCCH-MTCHp. 1143

The IE CFR-ConfigMCCH-MTCH is used to configure the common frequency resource used for MCCH and MTCH reception.
CFR-ConfigMCCH-MTCH information element
CFR-ConfigMCCH-MTCH field descriptions
commonControlResourceSetExt
An additional common control resource set which may be configured and used for searchSpaceMCCH/searchSpaceMTCH or UE-specific search space in the BWP where searchSpaceMCCH is configured. It is contained in the bandwidth of locationAndBandwidthBroadcast.
locationAndBandwidthBroadcast
Indicates starting PRB and the number of PRBs of CFR used for MCCH and MTCH reception.
Value sameAsSib1ConfiguredLocationAndBW means the CFR for broadcast has the same location and size as the locationAndBandwidth for initial BWP configured in SIB1.
Value locationAndBandwidth is used to configure CFR with bandwidth that is larger than and fully contains the bandwidth for the initial DL BWP and CORESET#0 configured in SIB1.
If the field is absent, the CFR for broadcast has the same location and size as CORESET0.
pdsch-ConfigMCCH
Indicates PDSCH parameters used for MCCH transmission. If the field is absent, PDSCH paramers used for MCCH are the same as those of PDSCH configuration provided in initialDownlinkBWP in SIB1.
Conditional Presence Explanation
NotSIB1CommonControlResourceThe field is optional present in case commonControlResourceSet is not configured in SIB1, Need R, otherwise it is absent.
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 –  DRX-ConfigPTMp. 1144

The IE DRX-Config-PTM is used to configure DRX related parameters for PTM transmission as specified in TS 38.321.
DRX-Config-PTM information element
DRX-Config-PTM field descriptions
drx-HARQ-RTT-Timer-DL-PTM
Value in number of symbols of the CFR where the transport block was received.
drx-InactivityTimerPTM
Value in multiple integers of 1 ms. ms0 corresponds to 0, ms1 corresponds to 1 ms, ms2 corresponds to 2 ms, and so on.
drx-LongCycleStartOffsetPTM
drx-LongCycle-PTM in ms and drx-StartOffset-PTM in multiples of 1 ms.
drx-onDurationTimerPTM
Value in multiples of 1/32 ms (subMilliSeconds) or in ms (milliSecond). For the latter, value ms1 corresponds to 1 ms, value ms2 corresponds to 2 ms, and so on.
drx-RetransmissionTimer-DL-PTM
Value in number of slot lengths of the CFR where the transport block was received. value sl0 corresponds to 0 slots, sl1 corresponds to 1 slot, sl2 corresponds to 2 slots, and so on.
drx-SlotOffsetPTM
Value in 1/32 ms. Value 0 corresponds to 0 ms, value 1 corresponds to 1/32 ms, value 2 corresponds to 2/32 ms, and so on.
Conditional Presence Explanation
HARQFeedbackThe field is mandatory present if HARQ feedback is enabled for a G-RNTI/G-CS-RNTI associated with this DRX configuration. It is absent otherwise.
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 –  MBS-NeighbourCellListp. 1145

The IE MBS-NeighbourCellList indicates a list of neighbour cells where ongoing MBS sessions provided via broadcast MRB in the current cell are also provided.
MBS-NeighbourCellList information element
MBS-NeighbourCellList field descriptions
carrierFreq
Indicates the frequency of the neighbour cell indicated by physCellId. Absence of the IE means that the neighbour cell is on the same frequency as the current cell.
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 –  MBS-ServiceListp. 1146

The IE MBS- ServiceList is used to inform the network of the MBS services that the UE is receiving or interested to receive.
MBS-ServiceList information element
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 –  MBS-SessionInfoListp. 1146

The IE MBS-SessionInfoList provides the list of ongoing MBS broadcast sessions transmitted via broadcast MRB and, for each MBS broadcast session, the associated G-RNTI and scheduling information.
MBS-SessionInfoList information element
MBS-SessionInfoList field descriptions
g-RNTI
G-RNTI used to scramble the scheduling and transmission of MTCH.
headerCompression
If rohc is configured, the UE shall apply the configured ROHC profile(s) in downlink.
mbs-SessionId
Indicates an identifier of the MBS session provided by the MTCH.
mrb-listBroadcast
A list of broadcast MRBs to which the associated broadcast MBS session is mapped to.
mtch-neighbourCell
Indicates neighbour cells which provide this service on MTCH. The first bit is set to 1 if the service is provided on MTCH in the first cell in mbs-NeighbourCellList, otherwise it is set to 0. The second bit is set to 1 if the service is provided on MTCH in the second cell in mbs-NeighbourCellList, and so on. If the service is not available in any neighbouring cell and mbs-NeighbourCellList is signalled, the network sets all bits in this field to 0. If this field is absent, the related service may or may not be available in any neighbouring cell, i.e. the UE cannot determine the presence or absence of an MBS service in neighbouring cells based on the absence of this field.
mtch-schedulingInfo
Indicates the index of DRX configuration entry in drx-ConfigPTM-List that is used for scheduling the MTCH. The value 0 corresponds to the first entry in drx-ConfigPTM-List, the value 1 corresponds to the second entry in drx-ConfigPTM-List and so on. In case mtch-schedulingInfo is absent for a G-RNTI (i.e. no PTM DRX), the UE shall monitor for PDCCH scrambled with G-RNTI in any slot according to the search space configured for MTCH (see TS 38.213, clause 10.1).
mtch-SSB-MappingWindowIndex
Indicates the index of MTCH-SSB-MappingWindowCycleOffset configuration entry in MTCH-SSB-MappingWindowList. The value 0 corresponds to the first entry in MTCH-SSB-MappingWindowList, the value 1 corresponds to the second entry in MTCH-SSB-MappingWindowList and so on. This field is set to the same value for all MBS sessions mapped to the same G-RNTI.
pdcp-SN-SizeDL
Indicates that PDCP sequence number size of 12 bits is used, as specified in TS 38.323. When the field is absent the UE applies the value as specified in 9.1.1.7.
pdschConfigIndex
Indicates the index of PDSCH configuration entry in pdschConfigList for MTCH. Value 0 corresponds to the first entry in pdschConfigList, the value 1 corresponds to the second entry in pdschConfigList and so on. When the field is absent the UE applies the first entry in pdschConfigList for MTCH.
sn-FieldLength
Indicates that the RLC SN field size of 6 bits is used, see TS 38.322. When the field is absent the UE applies the value as specified in 9.1.1.7.
t-Reassembly
Timer for reassembly in TS 38.322, in milliseconds. Value ms0 means 0 ms, value ms5 means 5 ms and so on. When the field is absent the UE applies the value in specified in 9.1.1.7.
t-Reordering
Value in ms of t-Reordering specified in TS 38.323. Value ms1 corresponds to 1 ms, value ms10 corresponds to 10 ms, and so on. When the field is absent the UE applies the value as specified in 9.1.1.7.
Conditional Presence Explanation
MTCH-MappingThe field is mandatory present if the number of actual transmitted SSBs determined according to ssb-PositionsInBurst in SIB1 is more than 1, and searchspaceMTCH is not set to zero (including the case where searchSpaceMTCH is absent and searchSpaceMCCH is not set to zero). Otherwise, it is absent, Need R.
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 –  MTCH-SSB-MappingWindowListp. 1149

The IE MTCH-SSB-MappingWindowList is used to configure MTCH PDCCH ocassions to SSB mapping window related periodic and offset parameters.
MTCH-SSB-MappingWindowList information element
MTCH-SSB-MappingWindowList field descriptions
MTCH-SSB-MappingWindowCycleOffset
Indicates the cycle and offset for MTCH PDCCH ocassions to SSB mapping. Values in unit of ms. ms10 corresponds to cycle of 10 ms with corresponding offset between 0 and 9 ms, value ms20 corresponds to cycle of 20 ms with corresponding offset between 0 and 19 ms, and so on. The mapping window starts at a subframe in a SFN where [(SFN number × 10) + subframe number] modulo (cycle) = offset.
PDCCH monitoring occasions for MTCH in a mapping window which are not overlapping with UL symbols (determined according to tdd-UL-DL-ConfigurationCommon) are sequentially numbered starting from 1 in the maping window. The [x×N+K]th PDCCH monitoring occasion for MTCH in this mapping window corresponds to the Kth transmitted SSB, where x = 0, 1, ...X-1, K = 1, 2, …N, N is the number of actual transmitted SSBs determined according to ssb-PositionsInBurst in SIB1 and X is equal to CEIL(number of PDCCH monitoring occasions in MTCH to SSB mapping transmission window/N). The actual transmitted SSBs are sequentially numbered from one in ascending order of their SSB indexes.
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 –  PDSCH-ConfigBroadcastp. 1149

The IE PDSCH-ConfigBroadcast is used to configure parameters for acquiring the PDSCH for MCCH and MTCH.
PDSCH-ConfigBroadcast information element
PDSCH-ConfigBroadcast field descriptions
lte-CRS-ToMatchAround
Parameters to determine an LTE CRS pattern that the UE shall rate match around.
pdschConfigList
List of PDSCH parameters which can be configured per G-RNTI. Only one entity is allowed to be configured if included in SIB20.
pdsch-TimeDomainAllocationList
List of time-domain configurations for timing of DL assignment to DL data.
The field pdsch-TimeDomainAllocationList applies to DCI format 4_0 (see table 5.1.2.1.1-1 in TS 38.214). When the field is absent, the UE follows PDSCH time domain resource allocation determination rule as specified in TS 38.214, clause 5.1.2.1.1.
rateMatchPatternToAddModList
Resources patterns which the UE should rate match PDSCH around. The UE rate matches around the union of all resources indicated in the rate match patterns (see TS 38.214, clause 5.1.4.1).
mcs-Table
Indicates which MCS table the UE shall use for PDSCH. If the field is absent the UE applies the value 64QAM. The field mcs-Table applies to DCI format 4_0 with CRC scrambled by MCCH-RNTI/G-RNTI (see TS 38.214, clause 5.1.3.1).
xOverhead
Accounts for an overhead from CSI-RS, CORESET, etc. If the field is absent, the UE applies value xOh0 (see TS 38.214, clause 5.1.3.2).
PDSCH-ConfigPTM field descriptions
dataScramblingIdentityPDSCH
Identifier(s) used to initialize data scrambling (c_init) for PDSCH as specified in TS 38.211, clause 7.3.1.1. When the field is absent the UE applies the value physCellId configured for this serving cell.
dmrs-ScramblingID0
DL DMRS scrambling initialization (see TS 38.211, clause 7.4.1.1.1). When the field is absent the UE applies the value physCellId configured for this serving cell.
pdsch-AggregationFactor
Number of repetitions for dynamic scheduling of MBS broadcast data for MTCH PDSCH (see TS 38.214, clause 5.1.2.1). When the field is absent the UE applies the value 1.
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 –  TMGIp. 1151

The IE TMGI is used to identify the MBS session.
TMGI information element
TMGI field descriptions
serviceId
Uniquely identifies the identity of an MBS service within a PLMN. The field contains octet 3- 5 of the IE Temporary Mobile Group Identity (TMGI) as defined in TS 24.008. The first octet contains the third octet of the TMGI, the second octet contains the fourth octet of the TMGI and so on.
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