6 Broadcast information receiving

25.3043GPPRelease 17TSUser Equipment (UE) procedures in idle mode and procedures for cell reselection in connected mode

6.1 Reception of System Information

Requirements are specified in [4].

6.2 Cell Broadcast in Idle Mode, CELL_PCH and URA_PCH

A UE supporting Cell Broadcast Service (CBS) shall be capable to receive BMC messages in the Idle mode, in URA_PCH and CELL_PCH. When several PCHs exist in the cell, the FACH which carries the CTCH may be mapped to a different SCCPCH than the PCH selected by the UE for paging in Idle mode (as specified in Sec. 8.1). In this case, UEs with basic service capabilities shall be capable to change from the SCCPCH that carries the PCH selected for paging to another SCCPCH which carries Cell Broadcast messages (i.e. the CTCH mapped to an FACH) and receive BMC messages during time intervals which do not conflict with the UE specific paging occasions.

The second system information broadcast channel (BCH on SCCPCH) is mapped on a separate SCCPCH, i.e. different from the SCCPCH which carriers the FACH with CTCH. In case CTCH occasions collide with transmissions of the second system information broadcast channel, the UE supporting second system information broadcast channel may decide not to receive the second broadcast channel.

NOTE: In case certain BMC messages conflict with the UE specific paging occasions the reception of CBS cannot be guaranteed and depends on UE capabilities.

6.3 MBMS Services

If the UE has activated MBMS services and MBMS is available in the cell (i.e., the MCCH information is provided on the BCCH) and the UE is permitted to receive MBMS in the cell, the UE shall:

– receive the MCCH as specified in clause 8.4 and in [4];

– participate in MBMS counting as specified in [4];

– receive each FACH on which the MTCH carrying an MBMS activated service that does not require the establishment of an RRC connection is mapped.

The UE may:

– monitor the MICH as specified in clause 8a and in [4];

– receive the MSCH.

6.3.1 MBSFN cluster selection and reselection

6.3.1.1 MBSFN cluster selection

MBSFN cluster selection/reselection process for MBSFN clusters operating on the same frequency may be based on reception quality of the CPICH for FDD and 3.84 Mcps TDD IMB or P-CCPCH for TDD. Details of the process are not specified.

The UE shall search for MBSFN clusters if the frequencies on which MBSFN clusters are available are not indicated in the cell that the UE is camping on for normal service if the mobile is configured to receive services via MBSFN mode. Details of the process are not specified.

For 1.28 Mcps TDD, the UE that needs receive MBMS services delivered in an MBSFN cluster may at the first step select a non MBSFN cell (i.e. a unicast cell), that the MBSFN cluster is associated with. The UE can get synchronized to the MBSFN cluster with the help of the information indicated in system information broadcast by the associated unicast cell,and receive the system information and MCCH messages in the MBSFN Special Timeslot. The details of the association between MBSFN clusters and non MBSFN cells operating in a unicast carrier are not specified. In case there are more than one MBSFN clusters indicated in system information broadcast by a unicast cell, the process of which MBSFN cluster should be selected for searching is not specified.

6.3.1.2 Camped on MBSFN cluster

When camped on a MBSFN cluster, the UE shall perform the following tasks:

– receive the MCCH as specified in clause 8.4 and in [4];

– monitor the available MBMS services on the MBSFN cluster that the UE is camping on

The UE may:

– monitor the MICH as specified in clause 8a and in [4];

– receive the MSCH.

6.3.1.3 MBSFN inter frequency neighbour information

Upon detection of one MBSFN cluster all other frequencies on which MBMS service is provided in MBSFN mode for one of the PLMN assigned to the MBSFN cluster are indicate as specified in [4].

The UE chooses the frequency for the MBSFN cluster to be received based on the information on the services that are provided on the MBSFN clusters of those frequencies.

In the case that the UE does not receive a service from the current MBSFN cluster and the UE is configured to receive an MBMS service in MBSFN mode it should attempt to receive information on ongoing services as specified in [4].