Methods, user equipment and radio network node for multimedia broadcast multicast service
A method and a user equipment as well as a method and a radio network node for multimedia broadcast service are disclosed. The radio network node sends, on a physical downlink control channel of the carrier, downlink control information using a multicast network identifier. The downlink control information includes a bit indicating whether or not at least two emergency notifications are broadcast on the carrier, and a notification relating to a change of a multicast channel of the carrier. The user equipment receives, on a physical downlink control channel of the carrier, downlink control information using a multicast network identifier. The user equipment behaves as if at least two fields relating to indication of said at least two emergency notifications are set to one in a paging message for the user equipment, when the bit is set to one.
1. A method performed by a user equipment, wherein the user equipment operates on a carrier configured for multimedia broadcast multicast services and comprising a physical downlink control channel (PDCCH) and a multicast channel, the method comprising:
receiving downlink control information (DCI) transmitted on the PDCCH, wherein DCI comprises: i) a bit indicating whether or not at least two emergency notifications are broadcast on the carrier and ii) a notification relating to a change of the multicast channel of the carrier; and
behaving as if at least two fields relating to indication of said at least two emergency notifications are set to one in a paging message for the user equipment, when the bit is set to one.
2. The method of claim 1 , wherein said at least two emergency notifications comprises an Earthquake and Tsunami Warning System (ETWS) notification and a Commercial Mobile Alert System (CMAS) notification.
3. The method of claim 1 , wherein the bit is a second but least significant bit of the downlink control information.
4. The method of claim 1 , wherein the behaving comprises searching, in the carrier, for said at least two emergency notifications.
5. A method, performed by a radio network node, wherein the radio network node manages a carrier configured for multimedia broadcast multicast services and comprising a physical downlink control channel (PDCCH) and a multicast channel, the method comprising:
sending downlink control information (PCI) on the PDCCH, wherein the PCI comprises i) a bit indicating whether or not at least two emergency notifications are broadcast on the carrier and ii) a notification relating to a change of a multicast channel of the carrier, wherein the bit, when set to one, cause a user equipment (UE) that receives the DCI to behave as if at least two fields relating to indication of said at least two emergency notifications are set to one in a paging message for the UE.
6. The method of claim 5 , wherein said at least two emergency notifications comprises an Earthquake and Tsunami Warning System (ETWS) notification and a Commercial Mobile Alert System (CMAS) notification.
7. The method of claim 5 , wherein the bit is a second but least significant bit of the downlink control information.
8. A user equipment is configured for operation on a carrier configured for multimedia broadcast multicast services and comprising a physical downlink control channel (PDCCH) and a multicast channel, the user equipment comprising:
a memory;
a processor coupled to the memory; and
a receiver coupled to the processor, for receiving downlink control information (PCI) transmitted on the PDCCH, wherein the DCI comprises i] a bit indicating whether or not at least two emergency notifications are broadcast on the carrier and ii) a notification relating to a change of a multicast channel of the carrier, wherein
the user equipment is configured for behaving as if at least two fields relating to indication of said at least two emergency notifications are set to one in a paging message for the user equipment, when the bit is set to one.
9. The user equipment of claim 8 , wherein said at least two emergency notifications comprises an Earthquake and Tsunami Warning System (ETWS) notification and a Commercial Mobile Alert System (CMAS) notification.
10. The user equipment of claim 8 , wherein the bit is a second but least significant bit of the downlink control information.
11. The user equipment of claim 8 , wherein the user equipment is configured for behaving as if at least two fields relating to indication of said at least two emergency notifications are set to one in the paging message by searching, in the carrier, for said at least two emergency notifications.
12. A radio network node is configured for managing a carrier configured for multimedia broadcast multicast services and comprising a physical downlink control channel (PDCCH) and a multicast channel, wherein the radio network node comprising:
a memory;
a processor coupled to the memory; and
a transmitter, coupled to the processor, for sending-downlink control information (PCI) transmitted on the PDCCH, wherein the DCI comprises i] a bit indicating whether or not at least two emergency notifications are broadcast on the carrier and ii) a notification relating to a change of a multicast channel of the carrier, wherein the bit, when set to one, cause a user equipment (UE) that receives the DCI to behave as if at least two fields relating to indication of said at least two emergency notifications are set to one in a paging message for the UE.
13. The radio network node of claim 12 , wherein said at least two emergency notifications comprises an Earthquake and Tsunami Warning System (ETWS) notification and a Commercial Mobile Alert System (CMAS) notification.
14. The radio network node of claim 12 , wherein the bit is a second but least significant bit of the downlink control information.
15. A computer program product comprising a non-transitory computer readable medium storing a computer program, comprising computer readable code units which when executed on a user equipment causes the user equipment to perform:
receiving downlink control information (DCI) transmitted on the PDCCH, wherein the DCI comprises i] a bit indicating whether or not at least two emergency notifications are broadcast on the carrier and ii) a notification relating to a change of a multicast channel of the carrier; and
behaving as if at least two fields relating to indication of said at least two emergency notifications are set to one in a paging message for the user equipment, when the bit is set to one.
16. A computer program product comprising a non-transitory computer readable medium storing a computer program, comprising computer readable code units which when executed on a radio network node causes the radio network node to perform:
sending-downlink control information (PCI) transmitted on the PDCCH, wherein the DCI comprises i] a bit indicating whether or not at least two emergency notifications are broadcast on the carrier and ii) a notification relating to a change of a multicast channel of the carrier, wherein
the bit, when set to one, cause a user equipment (UE) that receives the DCI to behave as if at least two fields relating to indication of said at least two emergency notifications are set to one in a paging message for the UE.
17. The method of claim 1 , wherein the DCI further comprises cyclic redundancy check (CRC) bits scrambled by a multicast network identifier.