A.3 GERAN requirements and recommendations

3GPP43.246Multimedia Broadcast/Multicast Service (MBMS) in the GERANRelease 17Stage 2TS

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

A.3.1 GERAN requirements

1) The procedure for MBMS mobile station multicast activation (Joining) shall be transparent to the GERAN.

2) The MBMS Notification procedure shall be performed within the MBMS service area.

3) MBMS shall not prevent support for SGSN in pool.

4) MBMS shall allow for efficient mobile station power consumption.

A.3.1 GERAN recommendations

1) MBMS charging should be transparent to the GERAN.

Annex B (informative):
Physical channel allocation scenarios

In this Annex, the maximum number of timeslots that can be received by an MBMS capable mobile station in different scenarios is investigated. This investigation is useful in the case of the reception of multiple sessions. The maximum number of timeslots that an MBMS session can be transmitted upon is 4. When transmitting multiple sessions on the same carrier, the network can choose one of the options in subclause 6.4.1; depending on the number of timeslots allocated to each session and which of the options in subclause 6.4.1 is chosen, the mobile station may or may not be able to listen to more than one session in parallel.

Only the cases where the mobile station needs to listen to the (P)CCCH and (P)BCCH in parallel to the MBMS data are analysed in this Annex. The analysis is carried out under the assumption that the mobile station is able to read both the (packet) broadcast control channel and the (packet) common control channel without having to interrupt the reception of MBMS and the transmission on the uplink feedback channel, if established. Additionally, in all the scenarios the maximum number of timeslots is calculated assuming that both the (P)BCCH and the (P)CCCH are located on only one timeslot; if this assumption is not satisfied (i.e. additional timeslots are used for (P)CCCH), the number of timeslots that MBMS can be received upon will be reduced.

Throughout the Annex, the maximum number of timeslots for each scenario is calculated assuming that the mobile station capabilities require T_tb = 1 and T_ra = 1 (see 3GPP TS 45.002 [8]).

NOTE: Due to the fact that T_ra = 1, neighbour cell measurements are not indicated in the figures.

The maximum number of timeslots will depend on whether an uplink feedback channel per MBMS session is established or not (see subclause 6.3). In case where an uplink feedback channel per MBMS session is established, for simplicity reasons in the following it is assumed that (any of) the uplink feedback channel(s) is(are) established on the same uplink timeslot.

The material in this Annex is not meant to provide an exhaustive analysis but only to give some general guidance.