Method for performing handover in broadband wireless access system
First Claim
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, andwherein the unsolicited sleep response message is received without a sleep request message.
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Abstract
A method of entering sleep mode in a mobile subscriber station in performing handover from a first base station (BS) to a second BS is disclosed. More specifically, the method includes entering sleep mode in the first base station and transmitting from the first base station sleep mode information in the first base station during handover, while receiving from a second base station sleep mode entry information in the second base station. The method further includes entering sleep mode based on the information the sleep mode entry information received from the second base station.
60 Citations
16 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A mobile subscriber station (MSS) for maintaining a sleep mode while performing a handover from a first base station (BS) to a second BS, wherein the mobile subscriber station is configured to:
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transmit a handover indication message to the first BS to indicate the MSS is about to perform the handover while the MSS is in a sleep mode; transmit 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; receive 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 enter 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification