10.2.16k MBMS Neighbouring Cell p-t-m rb Information

25.3313GPPProtocol specificationRadio Resource Control (RRC)Release 17TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

This message is transmitted periodically by UTRAN to inform UEs about the p-t-m RB configuration used to in neighbouring cells, indicating the UE may perform selection and/ or soft combining. The message content does not change within a modification period. If the cell is operating in MBSFN mode as indicated in subclause 8.1.1.6.3 the UE behaviour upon reception of this message is unspecified.

RLC-SAP: UM

Logical channel: MCCH

Direction: UTRAN  UE

Information Element/Group name	Need	Multi	Type and reference	Semantics description	Version
Message type	MP		Message Type		REL-6
Neighbouring cell identity	MP		Integer (0..<maxCellMeas1>)	The intra-frequency cell id of the cell obtained from the IE ‘Intra-frequency Cell Info list’ in SIB 11/SIB 11bis. In case the intra-frequency cell id is omitted in the IE ‘Intra-frequency Cell Info list’ in SIB 11/SIB11bis, it refers to the index (starting at zero) in the CELL_INFO_LIST as if the CELL_INFO_LIST was constructed from SIB11/SIB11bis only, see 8.6.7.3.	REL-6
Neighbouring cell’s S-CCPCH list	MP	1 to <maxSCCPCH>			REL-6
>CHOICE PhyCh	MP				REL-7
>>By reference					REL-7
>>>Secondary CCPCH info	MP		MBMS Common PhyCh identity 10.3.9a.2	S-CCPCH configuration used in neighbouring cell. Refers to a configuration in the common RB info of the current cell	REL-6
>>Extended				FDD only	REL-7
>>>Secondary CCPCH info	OP		MBMS Common PhyCh identity 10.3.9a.2	Referenced S-CCPCH configuration used in neighbouring cell. Refers to a configuration in the common RB info of the current cell	REL-7
>>>Secondary CCPCH info MBMS Diff	MP		Secondary CCPCH info MBMS Diff 10.3.6.71b	Differential S-CCPCH configuration. Physical configuration parameters in this IE replace the corresponding parameters in the referenced S-CCPCH configuration. If the referenced S-CCPCH configuration is absent, the full set of parameters is needed.	REL-7
>Secondary CCPCH Power Offset Difference	MD		Integer (-6, -3, 3, 6)	Difference (Pn  Of) between the S-CCPCH power offset (Pn) of the neighboring cell S-CCPCH and the S-CCPCH power offset (Of) of the serving cell that is going to be combined to this neighbour cell S-CCPCH, in dB. Default value is 0. Note 3 and 4.	REL-6
>L1 combining	OP			L2- combining applies if the IE is absent	REL-6
>>CHOICE mode	MP				REL-6
>>>FDD					REL-6
>>>>MBMS Soft Combining Timing Offset	MP		MBMS Soft Combining Timing Offset 10.3.9a.10a	Timing offset applied in the CFN calculation in subclause 8.5.15.5	REL-6
>>>>MBMS transmission time difference	MP		Integer (0..3)	Indicates the time difference between the TTIs on the current and the neighbouring cell’s SCCPCH that can be L1- combined	REL-6
>>>>MBMS L1 combining schedule	OP		MBMS L1 combining schedule 10.3.9a.7	If included partial layer 1 combining applies, in which case this IE indicates when L1- combining applies. If the IE is absent, L1 combining applies continuously	REL-6
>>>TDD				(no data)	REL-6
>>>TDD				If L1 combining is configured, for 1.28Mcps TDD UE, MBMS data reception shall be implemented by means of chip combine receiver [55].	REL-7
>CHOICE L23 configuration	MP				REL-6
>>SameAs Current cell				Apart from the physical channel configuration and the MSCH configuration information, the same configuration as for the indicated S-CCPCH used in the current cell applies. The MSCH is mapped on the same transport channel as in the current cell.	REL-6
>>>Current cell’s S-CCPCH	MP		MBMS Current cell S-CCPCH identity 10.3.9a.5	Reference to the S-CCPCH in the current cell which uses exaclty the same configuration (excluding MSCH configuration).	REL-6
>>>MSCH configuration information	OP		MSCH configuration information 10.3.9a.16		REL-6
>>Different					REL-6
>>>TrCh information for common for all TrCh	MD		MBMS Common CCTrCh identity 10.3.9a.1	Refers to a (TFCS) configuration in the common RB info The default value of the TFCS is specified in subclause 14.10.1	REL-6
>>>TrCH information list	MP	1 to <maxFACHPCH>		List of FACH transport channels carrying one or more MTCH and optionally one MSCH	REL-6
>>>>TrCh information	MP		MBMS Common TrCh identity 10.3.9a.4	Refers to a (TFS) configuration in the common RB info	REL-6
>>>>TrCh combining status	MP		BOOLEAN	Value TRUE means that TrCh combining is used for this transport channel (TDD only). Note 2. The IE shall be ignored in FDD mode.	REL-6
>>>>RB information list	OP	1 to <maxRBperTrCh>		The IE is only present for the radio bearers for which selection (FDD) or transport channel (TDD) combining applies.	REL-6
>>>>>RB information	MP		MBMS p-t-m RB information 10.3.9a.7a		REL-6
>>>>MSCH configuration information	OP		MSCH configuration information 10.3.9a.16	Included if the TrCH carries MSCH	REL-6

NOTE 1: The signalling supports the option that UTRAN maps one service to L1 combining slots for some neighbours and to the L2 combining slots for other neighbours ie. the use of different combining schemes for different neighbours

NOTE 2: Transport combining can only be indicated when the complete L2 configuration is provided for the neighbouring cell (i.e. using L2 configuration choice “different”). Fortunately, a scenario in which the neighbouring cell configuration is different from the current cell is regarded as the typical scenario for using transport combining.

NOTE 3: For FDD, an S-CCPCH power offset is defined as the offset between the transmitted power of the data part of one S-CCPCH and the transmitted power of the P-CPICH of a given cell (Ps-ccpch – Pp-cpich). For TDD, an S-CCPCH power offset is defined as the offset between one S-CCPCH and the P-CCPCH of a given cell (Ps-ccpch – Pp-ccpch).

NOTE 4: The Secondary CCPCH Power Offset Difference IE gives the UE an indication of the S-CCPCH power on the neighbouring cells that may be used to complete the neighbouring cell ranking based on P-CPICH power for FDD or P-CCPCH for TDD.