Patent ID: 7986949
Filing Date: 2011-07-26
Classification: H04W,Y02D

Abstract:
1. A method of maintaining a sleep mode by a mobile subscriber station (MSS) while performing a handover from a first base station (BS) to a second BS, the method comprising: the MSS entering the sleep mode while communicating with the first BS; the MSS transmitting a handover indication message to the first BS to indicate that the MSS is about to perform the handover; the MSS transmitting a ranging request message to the second BS when the MSS is attempting to perform the handover, wherein the ranging request message comprises power saving class parameters for informing the second BS of a preference of the MSS to continue in the sleep mode after the handover; receiving an unsolicited sleep response message from the second BS when the MSS has transmitted the ranging request message including the power saving class parameters to the second BS, wherein the unsolicited sleep response message includes the power saving class parameters; and the MSS entering the sleep mode based on the power saving class parameters in the unsolicited sleep response message received from the second BS, wherein the power saving class parameters include information used for operating the sleep mode, and wherein the unsolicited sleep response message is received without a sleep request message.