METHOD AND APPARATUS FOR WALSH SPACE ASSIGNMENT IN A COMMUNICATION SYSTEM
First Claim
1. A method of Walsh space assignment comprising:
- sending a Walsh space indicator from a base station to one or more mobile stations, the Walsh space indicator specifying a number of Walsh functions, for use in data demodulation, from a programmed list of Walsh functions.
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Abstract
Techniques for Walsh space assignment are disclosed. In one aspect, a list of Walsh functions is maintained in the base station and mobile stations. A Walsh space indicator is transmitted to indicate which of the Walsh functions on the list are to be used in communication. The Walsh space indicator is updated according to the dynamically varying transmit power available or the use of Walsh functions within the base station. Methods by which a mobile station can request Walsh space information are provided. In another aspect, a Walsh space indicator channel is continually broadcast for mobile stations to detect the Walsh space indicator therefrom. In yet another aspect, the Walsh space indicator is used to initialize convolutional encoders and decoders, to provide a mechanism for mitigating against errors introduced while receiving Walsh space indicators. Various other aspects are also presented.
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Citations
51 Claims
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1. A method of Walsh space assignment comprising:
sending a Walsh space indicator from a base station to one or more mobile stations, the Walsh space indicator specifying a number of Walsh functions, for use in data demodulation, from a programmed list of Walsh functions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of Walsh space assignment, comprising:
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computing a Walsh space indicator specifying a number of Walsh functions, for use in data demodulation, from a programmed list of Walsh functions; and continuously transmitting the Walsh space indicator from a base station to one or more mobile stations. - View Dependent Claims (12)
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- 13. A method of Walsh space assignment comprising signaling a request for transmission of the Walsh space information.
- 18. A method for receiving a Walsh indicator channel, including a Walsh space indicator, periodically transmitted from a base station, comprising decoding the Walsh indicator channel to detect a Walsh space indicator.
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24. A method for Walsh space assignment, comprising:
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transmitting a Walsh space indicator; encoding messages, the encoding initialized with the Walsh space indicator; and transmitting the encoded messages. - View Dependent Claims (25, 26, 27)
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28. A method for data communication, in a system including a base station transmitting a control channel and a periodically transmitted Walsh indicator channel, including a Walsh space indicator, comprising:
decoding a first period of the Walsh indicator channel to detect the Walsh space indicator. - View Dependent Claims (29, 30, 31, 32, 33)
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34. A base station, communicatively coupled with a plurality of mobile stations, the base station and each of the plurality of mobile stations containing a list of Walsh functions, one or more of the Walsh functions for use in data communication, the base station comprising:
a message generator for generating a Walsh space indicator message, the Walsh space indicator message including a Walsh space indicator identifying a subset of the list of Walsh functions for use in data communication. - View Dependent Claims (35, 36, 37, 38, 39, 40)
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41. A mobile station, communicatively coupled with a base station, the base station and the mobile station containing a list of Walsh functions, one or more of the Walsh functions for use in data communication, the mobile station comprising:
a message decoder for decoding a Walsh space indicator message, the Walsh space indicator message including a Walsh space indicator identifying a subset of the list of Walsh functions for use in data communication. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49)
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50. A communication system comprising:
means for sending a Walsh space indicator from a first station to a second station, the Walsh space indicator specifying a number of Walsh functions, for use in data demodulation, from a programmed list of Walsh functions.
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51. Processor readable media operable to perform the following step:
sending a Walsh space indicator from a first station to a second station, the Walsh space indicator specifying a number of Walsh functions, for use in data demodulation, from a programmed list of Walsh functions.
Specification