Multicast/broadcast service continuity in multi-carrier networks

1. One or more non-transitory computer-readable media having instructions, stored thereon, that when executed by one or more processors of a user equipment (UE), cause the UE to:

obtain, from a base station via a wireless communication network, multimedia broadcast multicast service (MBMS) assistance information to indicate one or more carrier frequencies by which a plurality of MBMSs are to be provided;

transmit, to the base station via the wireless communication network, an MBMS interest indication message to indicate one or more of the carrier frequencies by which the UE is receiving or interested to receive two or more of the MBMSs; and

transmit, to the base station via the wireless communication network, an indicator of how many MBMSs the UE is to receive.

2. The one or more non-transitory computer-readable media of claim 1 , wherein the MBMS interest indication message further includes a priority indicator having a single bit to indicate a priority of the UE for reception of all the carrier frequencies indicated by the MBMS interest indication message compared to reception of any unicast bearer.

3. The one or more non-transitory computer-readable media of claim 1 , wherein the MBMS interest indication message further includes a priority indicator having two bits to indicate one of four levels of priority of receiving the two or more MBMSs compared with a unicast service.

4. The one or more non-transitory computer-readable media of claim 1 , wherein the instructions, when executed, further cause the UE to transmit, to the base station via the wireless communication network, another MBMS interest indication having a null frequency if the UE is no longer receiving or interested in receiving any of the MBMSs.

5. The one or more non-transitory computer-readable media of claim 1 , wherein the MBMS interest indication message includes:

an MBMS identifier of respective MBMSs the UE is receiving or interested to receive; or a temporary mobile group identity (TMGI) of the respective MBMSs the UE is receiving or interested to receive.

6. The one or more non-transitory computer-readable media of claim 1 , wherein the instructions, when executed, further cause the UE to transmit, to the base station via the wireless communication network, capability information of the UE associated with MBMS reception.

7. The one or more non-transitory computer-readable media of claim 1 , wherein the instructions are to cause the UE to transmit the MBMS interest indication message if:

one or more of the MBMSs the UE is receiving or interested in receiving is not offered on any of one or more serving cells that are currently serving the UE;

all receivers of the UE are currently being used to receive transmissions from the one or more serving cells; and

unicast access is permitted on the respective carrier frequency associated with the one or more of the MBMSs the UE is receiving or interested in receiving.

8. The one or more non-transitory computer-readable media of claim 1 , wherein the instructions, when executed, further cause the UE to obtain an indicator of a carrier selection mode to be used by the UE, wherein the carrier selection mode is a first selection mode that prioritizes selection of carrier frequencies that provide MBMSs or a second selection mode that prioritizes selection of carrier frequencies based on signal quality without regard to whether the respective carrier frequency transmits MBMS.

9. The one or more non-transitory computer-readable media of claim 1 , wherein the MBMS assistance information includes information to indicate multiple alternative carrier frequencies by which a same MBMS is to be provided.

10. The one or more non-transitory computer-readable media of claim 1 , wherein the MBMS assistance information includes information to indicate multiple carrier frequencies by which different MBMSs of the plurality of MBMSs are to be provided.

11. One or more non-transitory computer-readable media having instructions, stored thereon, that when executed by one or more processors of a base station, cause the base station to:

transmit, to a user equipment (UE) via a wireless communication network, multimedia broadcast multicast service (MBMS) assistance information to indicate one or more carrier frequencies by which a plurality of MBMSs are to be provided;

obtain, from the UE via the wireless communication network, an MBMS interest indication message to indicate one or more of the carrier frequencies by which the UE is receiving or is interested to receive two or more of the plurality of MBMSs; and

obtain, from the UE via the wireless communication network, an indicator of how many of the MBMSs the UE is to receive.

12. The one or more non-transitory computer-readable media of claim 11 , wherein the MBMS interest indication message further includes a priority indicator to indicate a priority of the UE for reception of all the carrier frequencies indicated in the MBMS interest indication message compared to reception of any unicast bearer.

13. The one or more non-transitory computer-readable media of claim 11 , wherein the MBMS assistance information further includes information on multiple alternative carrier frequencies by which a same MBMS of the plurality of MBMSs is to be provided or information on multiple carrier frequencies by which different MBMSs of the plurality of MBMSs are to be provided.

14. The one or more non-transitory computer-readable media of claim 11 , wherein the MBMS assistance information further includes an indicator of a carrier selection mode to be used by the UE, wherein the carrier selection mode is a selected one of a first selection mode that prioritizes selection of carrier frequencies that provide MBMSs or a second selection mode that prioritizes selection of carrier frequencies based on signal quality without regard to whether the respective carrier frequency transmits MBMS.

15. The one or more non-transitory computer-readable media of claim 11 , wherein the instructions, when executed, further cause the base station to obtain, from the UE via the wireless communication network, another MBMS interest indication having a null frequency to indicate that the UE is no longer receiving or interested in receiving any of the MBMSs.

16. An apparatus to be employed by a user equipment (UE), the apparatus comprising:

means for obtaining, from a base station via a wireless communication network, multimedia broadcast multicast service (MBMS) assistance information to indicate one or more carrier frequencies by which a plurality of MBMSs are to be provided;

means for transmitting, to the base station via the wireless communication network, an MBMS interest indication message to indicate one or more of the carrier frequencies by which the UE is receiving or interested to receive two or more of the MBMSs; and

means for transmitting, to the base station via the wireless communication network, an indicator of how many MBMSs the UE is to receive.

17. The apparatus of claim 16 , wherein the MBMS interest indication message further includes a priority indicator having a single bit to indicate a priority of the UE for reception of all the carrier frequencies indicated by the MBMS interest indication message compared to reception of any unicast bearer.

18. The apparatus of claim 16 , further comprising means for transmitting, to the base station via the wireless communication network, another MBMS interest indication having a null frequency if the UE is no longer receiving or interested in receiving any of the MBMSs.

19. The apparatus of claim 16 , wherein the MBMS interest indication message includes:

an MBMS identifier of respective MBMSs the UE is receiving or interested to receive; or

a temporary mobile group identity (TMGI) of the respective MBMSs the UE is receiving or interested to receive.

20. The apparatus of claim 16 , further comprising means for indicating, to the base station via the wireless communication network, capability information of the UE associated with MBMS reception.

21. The apparatus of claim 16 , wherein the means to transmit the MBMS interest indication message are to transmit the MBMS interest indication message if:

one or more of the MBMSs the UE is receiving or interested in receiving is not offered on any of one or more serving cells that are currently serving the UE;

all receivers of the UE are currently being used to receive transmissions from the one or more serving cells; and

unicast access is permitted on the respective carrier frequency associated with the one or more of the MBMSs the UE is receiving or interested in receiving.

22. The apparatus of claim 16 , further comprising means to obtain an indicator of a carrier selection mode to be used by the UE, wherein the carrier selection mode is a first selection mode that prioritizes selection of carrier frequencies that provide MBMSs or a second selection mode that prioritizes selection of carrier frequencies based on signal quality without regard to whether the respective carrier frequency transmits MBMS.

23. An apparatus to be employed by a base station, comprising:

means for transmitting, to a user equipment (UE) via a wireless communication network, multimedia broadcast multicast service (MBMS) assistance information to indicate one or more carrier frequencies by which a plurality of MBMSs are to be provided;

means for receiving, from the UE via the wireless communication network, an MBMS interest indication message to indicate one or more of the carrier frequencies by which the UE is receiving or is interested to receive two or more of the plurality of MBMSs; and

means for receiving, from the UE via the wireless communication network, an indicator of how many of the MBMSs the UE is to receive.

24. The apparatus of claim 23 , wherein the MBMS assistance information further includes an indicator of a carrier selection mode to be used by the UE, wherein the carrier selection mode is a selected one of a first selection mode that prioritizes selection of carrier frequencies that provide MBMSs or a second selection mode that prioritizes selection of carrier frequencies based on signal quality without regard to whether the respective carrier frequency transmits MBMS.

25. The apparatus of claim 23 , further comprising means for receiving, from the UE via the wireless communication network, another MBMS interest indication having a null frequency to indicate that the UE is no longer receiving or interested in receiving any of the MBMSs.