Multi-cell coordination for multimedia broadcast multicast services in a wireless communication system
The present invention is related to a method and system for multi-cell coordination for multimedia broadcast multicast services (MBMS) in a wireless communication system. An MBMS multi-cell coordination unit is provided to coordinate a plurality of evolved Node-Bs (eNodeBs) for transmission of MBMS data synchronously in multiple cells of the same single frequency network (SFN). The MBMS multi-cell coordination unit may be located in an access gateway or in an eNodeB. An MBMS multi-cell scheduling scheme may be preconfigured for the eNodeBs for synchronization. Alternatively, the eNodeBs may be synchronized dynamically.
1. An access gateway for controlling a plurality of evolved Node-Bs (eNodeBs) in a single frequency network (SFN), the access gateway comprising:
a control plane interface;
a user plane interface; and
a multimedia broadcast multicast services (MBMS) multi-cell coordination unit including:
a MBMS coordination control part coupled to the control plane interface and configured to coordinate control signaling to the eNodeBs of the SFN via the control plane interface, and
a MBMS coordination data part coupled to the user plane interface and configured to coordinate data signaling to the eNodeBs of the SFN via the user plane interface,
wherein the MBMS multi-cell coordination unit is configured to:
receive information for determining a start time of the eNodeBs in the SFN for multicasting data from the eNodeBs, and
send a scheduling scheme to provide a common configuration and a timestamp, corresponding to the determined start time, for start time synchronization of the multicasting of the data from the eNodeBs of the SFN.
2. The access gateway of claim 1 , wherein the MBMS coordination control part has a plurality of instances.
3. The access gateway of claim 2 , wherein the MBMS coordination data part has a plurality of instances.
4. The access gateway of claim 1 , wherein the MBMS multi-cell coordination unit is configured to send the time stamp to indicate a coordinated time when MBMS data is to be transmitted by the eNodeBs to wireless transmit/receive units of the SFN.
5. The access gateway of claim 1 , wherein the MBMS multi-cell coordination unit is configured to receive configuration information from an operations, administration and maintenance (OAM) system and to send the scheduling scheme to the eNodeBs based on the received configuration information.
6. The access gateway of claim 1 , wherein the MBMS multi-cell coordination unit is configured to send the scheduling scheme to the eNodeBs in advance of multicasting of the data from the eNodeBs to commonly configure each of the eNodeBs of the SFN for multicasting of the data from the eNodeBs of the SFN.
7. A method implemented by an access gateway for controlling a plurality of evolved Node-Bs (eNodeBs) in a single frequency network (SFN), the method comprising:
coupling to control and user plane interfaces;
configuring MBMS coordination parts to coordinate signaling to the eNodeBs of the SFN via the control and user plane interfaces;
receiving information for determining a start time of the eNodeBs of the SFN for multicasting data from the eNodeBs, and
sending a scheduling scheme to provide a common configuration and a timestamp, corresponding to the determined start time, for start time synchronization of the multicasting of the data from the eNodeBs of the SFN.
8. The method of claim 7 , wherein the configuring of the MBMS coordination parts includes configuring a plurality of instances of any of: (1) a MBMS coordination data part; or (2) a MBMS coordination control part.
9. The method of claim 7 , wherein the sending of the timestamp includes sending one time stamp to indicate a coordinated time when MBMS data is to be transmitted by the eNodeBs to wireless transmit/receive units of the SFN.
10. The method of claim 7 , further comprising receiving configuration information from an operations, administration and maintenance (OAM) system,
wherein the sending of the scheduling scheme to the eNodeBs is based on the received configuration information.
11. The method of claim 7 , wherein the sending of the scheduling scheme to provide the common configuration and the timestamp includes sending the scheduling scheme to the eNodeBs in advance of multicasting of the data from the eNodeBs to commonly configure each of the eNodeBs of the SFN for multicasting of the data from the eNodeBs of the SFN.
12. The method of claim 7 , wherein the scheduling scheme includes scheduling information, as any of: a MBMS service type, a data rate, a start time or an end time.