Patent ID: 8488509

Claim:
A method of receiving a point-to-multipoint service in wireless communication system, the method comprising: receiving scheduling information for the point-to-multipoint service in a first multicast channel (MCH) scheduling period, where the scheduling information includes an MCH scheduling information (MSI) skip indication and a flag, where the MSI skip indication indicates an offset to a second MCH scheduling period where the point-to-multipoint service is actually to be received, where the offset indicates a number of MCH scheduling periods in which a reception of consecutive scheduling information is skipped, and where the flag indicates whether sub-frame information is included or not in the scheduling information; sleeping during the offset indicated by the MSI skip indication; receiving the next scheduling information for the point-to-multipoint service in the second MCH scheduling period based on the MSI skip indication; and receiving the point-to-multipoint service according to the received next scheduling information, wherein the MSI is received in a form of a media access control (MAC) control element (CE), the MAC CE including lists of all point-to-multipoint services, a MAC protocol data unit (PDU) including a MAC header, and a MAC payload which includes the MAC CE, the MAC header including an R field, an E field, and a logical channel identity (LCID) field, and wherein the sub-frame information indicating a specific sub-frame transmitting the point-to-multipoint service within a MCH scheduling period is included in the scheduling information if a value of the flag is 0.