Apparatus and method for operating hierarchical cell in broadband wireless communication system
First Claim
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1. A method for an operation of a femto Base Station (BS) in a wireless communication system, the method comprising:
- transitioning into a sleep mode if there is no accessed Mobile Station (MS) for a predefined time;
transmitting a first message in the sleep mode to notify of the presence of the femto BS; and
releasing the sleep mode upon receiving a second message from an MS that has received the first message,wherein the transmitting of the first message comprises transmitting the first message periodically through a portion of radio resources of a macro BS that are allocated to the femto BS by the macro BS,wherein the second message is received during a gap period allocated to the MS by the macro BS for transmission of the second message, andwherein the second message corresponds to a message informing the femto BS to release the sleep mode.
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Abstract
An apparatus and method for operating a hierarchical cell in a wireless communication system are provided. A femto BS transitions into a sleep mode if there is no accessed MS for a predefined time. The femto BS transmits a FEMTO-ADV message in the sleep mode to notify of the presence of the femto BS. The femto BS releases the sleep mode upon receiving a MOB-FEMTO-AWAKE-REQ message from an MS receiving the FEMTO-ADV message. Thereafter, the femto BS communicates with the MS.
18 Citations
22 Claims
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1. A method for an operation of a femto Base Station (BS) in a wireless communication system, the method comprising:
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transitioning into a sleep mode if there is no accessed Mobile Station (MS) for a predefined time; transmitting a first message in the sleep mode to notify of the presence of the femto BS; and releasing the sleep mode upon receiving a second message from an MS that has received the first message, wherein the transmitting of the first message comprises transmitting the first message periodically through a portion of radio resources of a macro BS that are allocated to the femto BS by the macro BS, wherein the second message is received during a gap period allocated to the MS by the macro BS for transmission of the second message, and wherein the second message corresponds to a message informing the femto BS to release the sleep mode. - View Dependent Claims (2, 3, 4, 5, 17, 19, 20, 21, 22)
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6. A method for an operation of a Mobile Station (MS) in a wireless communication system, the method comprising:
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receiving a first message from a femto Base Station (BS) in a sleep mode in a macro cell; transmitting, to the macro BS, a request for the macro BS to allocate a gap period during which the MS will transmit the second message; transmitting a second message to the femto BS upon receiving the first message; and accessing the femto BS, wherein the receiving of the first message comprises determining whether the first message is periodically received through a portion of radio resources of a macro BS that are allocated to the femto BS from the macro BS, and wherein the second message corresponds to a message informing the femto BS to release the sleep mode. - View Dependent Claims (7, 8)
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9. An apparatus for a femto Base Station (BS) in a wireless communication system, the apparatus comprising:
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a transmitter for transmitting a first message in a sleep mode to notify of the presence of the femto BS; a mode determiner control unit for controlling transitioning into the sleep mode if there is no accessed Mobile Station (MS) for a predefined time, and for controlling releasing the sleep mode upon receiving a second message from an MS which has received the first message; and a communication controller for communicating with the MS, wherein the transmitter transmits the first message periodically through a portion of radio resources of a macro BS that are allocated to the femto BS by the macro BS, wherein the second message is received during a gap period allocated to the MS by the BS for transmission of the second message, and wherein the second message corresponds to a message informing the femto BS to release the sleep mode. - View Dependent Claims (10, 11, 12, 13, 18)
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14. An apparatus for a Mobile Station (MS) in a wireless communication system, the apparatus comprising:
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a receiver for receiving a first message from a femto Base Station (BS) in a sleep mode servicing a shadow area in a macro cell; a transmitter for transmitting a second message to the femto BS upon receiving the first message, and for transmitting to the macro BS, a request for the macro BS to allocate a gap period during which the MS will transmit the second message; and a communication controller for accessing the femto BS, wherein the receiver receives the first message periodically through a portion of radio resources of a macro BS that are allocated to the femto BS by the macro BS, and wherein the second message corresponds to a message informing the femto BS to release the sleep mode. - View Dependent Claims (15, 16)
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Specification