Reducing data loss during cell handoffs
First Claim
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1. A method for reducing data loss in wireless communications comprising:
- communicating data with a first base station using first transmission parameters that comprise a first window size and a first code book for encoding data, wherein the data is associated with a communications session;
detecting an imminent transition of the communications session from the first base station to a second base station; and
in response to detecting the imminent transition, requesting second transmission parameters for communications to the first base station, the second transmission parameters comprising a second window size smaller than the first window size and further comprising a second code book for encoding data, wherein the size of the second code book is smaller than the size of the first code book, the request for the second transmission parameters to reduce data loss during the transition from the first base station to the second base station.
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Abstract
In a wireless communications system, mobile units establish data communications sessions using wireless links having negotiated transmission parameters. To reduce data loss during handoffs of the wireless data communications sessions, transmission parameters are renegotiated upon detecting an imminent handoff.
130 Citations
23 Claims
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1. A method for reducing data loss in wireless communications comprising:
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communicating data with a first base station using first transmission parameters that comprise a first window size and a first code book for encoding data, wherein the data is associated with a communications session;
detecting an imminent transition of the communications session from the first base station to a second base station; and
in response to detecting the imminent transition, requesting second transmission parameters for communications to the first base station, the second transmission parameters comprising a second window size smaller than the first window size and further comprising a second code book for encoding data, wherein the size of the second code book is smaller than the size of the first code book, the request for the second transmission parameters to reduce data loss during the transition from the first base station to the second base station. - View Dependent Claims (2, 3, 4, 5)
transitioning the communications session from the first base station to the second base station; and
requesting third transmission parameters for communications to the second base station, the third transmission parameters comprising a third window size greater than the second window size.
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5. The method of claim 1, wherein detecting the imminent transition comprises detecting a request for a new window size for transmissions from the first base station.
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6. A mobile unit comprising:
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an interface operable to communicate data with a first base station using first transmission parameters that comprise a first window size and a first code book for encoding data, wherein the data is associated with a communications session; and
a controller operable to detect an imminent transition of the communications session from the first base station to a second base station and, in response to detecting the imminent transition, to request second transmission parameters for transmissions to the first base station, the second transmission parameters comprising a second window size smaller than the first window size and further comprising a second code book for encoding data, wherein the size of the second code book is smaller than the size of the first code book, the request for the second transmission parameters to reduce data loss during the transition from the first base station to the second base station. - View Dependent Claims (7, 8, 9, 10)
the interface is further operable to transition the communications session from the first base station to the second base station; and
the controller is further operable to request third transmission parameters for communications to the second base station, the third transmission parameters comprising a third window size greater than the second window size.
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10. The mobile unit of claim 6, wherein:
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the interface is further operable to receive an incoming request for a new window size for transmissions from the base station; and
the controller is further operable to detect the imminent transition by detecting the incoming request and to request the second transmission parameters in response to the incoming request.
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11. A mobile switching center operable to:
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negotiate first transmission parameters for transmissions of data from a first base station to a mobile unit, wherein the first transmission parameters comprise a first window size for transmissions of data to the mobile unit from the first base station and a first code book for encoding data, the data associated with a communications session;
detect an imminent transition of the communications session from the first base station to a second base station; and
in response to detecting the imminent transition, request second transmission parameters for transmissions of data from the first base station to the mobile unit, wherein the second transmission parameters comprise a second window size for transmissions smaller than the first window size, and further in response to detecting the imminent transition to modify a code book used for encoding transmissions from the first base station to the mobile unit from the first codebook to a second codebook. - View Dependent Claims (12, 13)
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14. Software for reducing data loss in wireless communications, the software embodied on a computer readable medium and operable to:
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communicate data with a first base station using first transmission parameters that comprise a first window size and a first code book for encoding data, wherein the data is associated with a communications session;
detect an imminent transition of the communications session from the first base station to a second base station; and
in response to detecting the imminent transition, request second transmission parameters for communications to the first base station, the second transmission parameters comprising a second window size smaller than the first window size and further comprising a second code book for encoding data, wherein the size of the second code book is smaller than the size of the first code book, the request for the second transmission parameters to reduce data loss during the transition from the first base station to the second base station. - View Dependent Claims (15, 16, 17, 18)
transition the communications session from the first base station to the second base station; and
request third transmission parameters for communications to the second base station, the third transmission parameters comprising a third window size greater than the second window size.
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18. The software of claim 14, further operable to detect the imminent transition by detecting a request for a new window size for transmissions from the first base station.
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19. A mobile unit comprising:
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means for communicating data with a first base station using first transmission parameters that comprise a first window size and a first code book for encoding data, wherein the data is associated with a communications session;
means for detecting an imminent transition of the communications session from the first base station to a second base station; and
means for, in response to detecting the imminent transition, requesting second transmission parameters for communications to the first base station, the second transmission parameters comprising a second window size smaller than the first window size and further comprising a second code book for encoding transmissions, wherein the size of the second code book is smaller than the size of the first code book, the request for the second transmission parameters to reduce data loss during the transition from the first base station to the second base station. - View Dependent Claims (20, 21, 22, 23)
means for transitioning the communications session from the first base station to the second base station; and
means for requesting third transmission parameters for communications to the second base station, the third transmission parameters comprising a third window size greater than the second window size.
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23. The mobile unit of claim 19, wherein the means for detecting the imminent transition comprises means for detecting a request for a new window size for transmissions from the first base station.
Specification