Handover in wireless communications
First Claim
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1. A method for handing over communications in a wireless network, comprising:
- receiving wireless communications service from a source base station;
receiving one or more assigned uplink control channels for transmitting schedule request signals to a plurality of target base stations;
transmitting a sounding reference signal (SRS) to at least one of the plurality of target base stations using at least one of the assigned uplink control channels;
receiving, from the at least one of the plurality of target base stations, a response to the SRS;
determining timing advance (TA) information from the received response to the SRS, wherein determining the TA information comprises;
comparing timing information associated with the at least one of the target base stations with timing information associated with the source base station; and
determining the TA information based on a difference between the timing information associated with the at least one of the target base stations and the timing information associated with the source base station;
selecting, based on the determined TA information, a base station of the plurality of target base stations to perform handover to; and
transmitting a scheduling request to the selected base station over at least one of the assigned uplink control channels using the determined TA information.
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Abstract
Systems and methodologies are described that facilitate handing over mobile device communications in a wireless network from a source base station to a target base station without using a random access channel (RACH). In this regard, the mobile device can monitor multiple base stations determining timing information related thereto and access scheduling request channels for the base stations. When ready for handover, the mobile device can request data resources over the scheduling request channel using the appropriate timing information.
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Citations
19 Claims
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1. A method for handing over communications in a wireless network, comprising:
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receiving wireless communications service from a source base station; receiving one or more assigned uplink control channels for transmitting schedule request signals to a plurality of target base stations; transmitting a sounding reference signal (SRS) to at least one of the plurality of target base stations using at least one of the assigned uplink control channels; receiving, from the at least one of the plurality of target base stations, a response to the SRS; determining timing advance (TA) information from the received response to the SRS, wherein determining the TA information comprises; comparing timing information associated with the at least one of the target base stations with timing information associated with the source base station; and determining the TA information based on a difference between the timing information associated with the at least one of the target base stations and the timing information associated with the source base station; selecting, based on the determined TA information, a base station of the plurality of target base stations to perform handover to; and transmitting a scheduling request to the selected base station over at least one of the assigned uplink control channels using the determined TA information. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for wireless communications, comprising:
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at least one processor configured to; receive wireless communications service from a source base station; receive one or more assigned uplink control channels for transmitting schedule request signals to a plurality of target base stations; transmit a sounding reference signal (SRS) to at least one of the plurality of target base stations using at least one of the assigned uplink control channels; receive, from the at least one of the plurality of target base stations, a response to the SRS; determine timing advance (TA) information from the received response to the SRS, wherein the at least one processor is configured to determine the TA information comprises; comparing timing information associated with the at least one of the target base stations with timing information associated with the source base station; and determining the TA information based on a difference between the timing information associated with the at least one of the target base stations and the timing information associated with the source base station; select, based on the determined TA information, a base station of the plurality of target base stations to perform handover to; and transmit a scheduling request to the selected base station over at least one of the assigned uplink control channels using the determined TA information; and a memory coupled to the at least one processor. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An apparatus for wireless communications, comprising:
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means for receiving wireless communications service from a source base station; means for receiving one or more assigned uplink control channels for transmitting schedule request signals to a plurality of target base stations; means for transmitting a sounding reference signal (SRS) to at least one of the plurality of target base stations using at least one of the assigned uplink control channels; means for receiving, from the at least one of the plurality of target base stations, a response to the SRS; means for determining timing advance (TA) information from the received response to the SRS, wherein determining the TA information comprises; comparing timing information associated with the at least one of the target base stations with timing information associated with the source base station; and determining the TA information based on a difference between the timing information associated with the at least one of the target base stations and the the timing information associated with the source base station; means for selecting, based on the determined TA information, a base station of the plurality of target base stations to perform handover to; and means for transmitting a scheduling request to the selected base station over at least one of the assigned uplink control channels using the determined TA information. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A non-transitory computer-readable medium comprising instructions which, when executed by one or more processors, performs an operation for handing over communications in a wireless network, the operation comprising:
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receiving wireless communications service from a source base station; receiving one or more assigned uplink control channels for transmitting schedule request signals to a plurality of target base stations; transmitting a sounding reference signal (SRS) to at least one of the plurality of target base stations using at least one of the assigned uplink control channels; receiving, from the at least one of the plurality of target base stations, a response to the SRS; determining timing advance (TA) information from the received response to the SRS, wherein determining the TA information comprises; comparing timing information associated with the at least one of the target base stations with timing information associated with the source base station; and determining the TA information based on a difference between the timing information associated with the at least one of the target base stations and the timing information associated with the source base station; selecting, based on the determined TA information, a base station of the plurality of target base stations to perform handover to; and transmitting a scheduling request to the selected base station over at least one of the assigned uplink control channels using the determined TA information.
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Specification