Patent ID: 8644204

Claim:
A method for a base station to instruct a mobile station to perform an operation mode transition, comprising: receiving battery level information from the mobile station, the battery level information being included in a signaling header that has a dynamic size and has no payload; determining, based on the battery level information, if the mobile station can perform an operation mode transition; and instructing the mobile station to perform the operation mode transition, if it is determined that the mobile station can perform the operation mode transition, wherein when the mobile station operates in one of an active mode or a sleep mode, the determining comprises: determining by the base station, if the received battery level information indicates that the mobile station is coupled to a power source, that the mobile station can perform an operation mode transition from the active mode or the sleep mode to a client cooperation mode in which the mobile station relays data from the base station to another mobile station; and determining by the base station, if a battery level of the mobile station included in the received battery level information satisfies a predetermined condition, that the mobile station can perform an operation mode transition from the active mode or the sleep mode to a deregistration with content retention (DCR) mode.