Method and apparatus for Walsh space assignment in a communication system
First Claim
1. A method of Walsh space assignment comprising:
- signaling, by a mobile station, a request for transmission of Walsh space information; and
suppressing the transmission of a channel quality indicator during the signaling.
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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
23 Claims
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1. A method of Walsh space assignment comprising:
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signaling, by a mobile station, a request for transmission of Walsh space information; and suppressing the transmission of a channel quality indicator during the signaling.
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2. A method of Walsh space assignment comprising:
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signaling, by a mobile station, a request for transmission of Walsh space information; and transmitting a special value in place of a channel quality indicator during the signaling.
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3. 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, wherein the decoding step comprises decoding a time period of the Walsh indicator channel, the decoding step further comprising:
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combining a second time period of the Walsh indicator channel with the first time period of the Walsh indicator channel when the Walsh space indicator is not detected; and decoding the combined time periods of the Walsh indicator channel to detect a Walsh space indicator. - View Dependent Claims (4, 5, 6)
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7. 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:
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decoding a first period of the Walsh indicator channel to detect the Walsh space indicator; and decoding a second period of the Walsh indicator channel to detect the Walsh space indicator if the Walsh space indicator is not detected in the first period. - View Dependent Claims (8, 9, 10)
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11. 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:
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decoding a first period and a second period of the Walsh indicator channel to detect the Walsh space indicator; and sending a message to the base station indicating that the Walsh space indicator was not detected if the Walsh space indicator is not detected in the first period, the second period, or a combination of the first and second periods.
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12. 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:
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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; and a message generator for generating a message requesting Walsh space information, wherein the message requesting Walsh space information is a channel quality indicator message with a unique value not associated with channel quality. - View Dependent Claims (13, 14, 15)
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16. 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:
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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; and a message generator for generating a message requesting Walsh space information, wherein the message requesting Walsh space information is a rate indicator message with a unique value not associated with a rate.
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17. 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:
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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; and a message generator for generating a message requesting Walsh space information, wherein the message requesting Walsh space information is an acknowledgement message with a unique value not associated with data acknowledgement.
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18. 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:
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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; and a message generator for generating a message requesting Walsh space information, wherein; the message decoder generates an error signal when the decoding of the Walsh space indicator message is unsuccessful; and the message generator generates the message requesting Walsh space information in response to the error signal.
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19. A method of Walsh space assignment comprising:
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signaling, by a mobile station, a request for transmission of Walsh space information by transmitting a unique value on a reverse channel; transmitting a channel quality indicator on the reverse channel; and transmitting Walsh space information on the forward channel when the channel quality indicator indicates that the channel exceeds a quality threshold.
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20. A computer program embodied on a computer-readable medium comprising:
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a first set of instructions for signaling a request for transmission of the Walsh space information; and a second set of instructions for suppressing the transmission of a channel quality indicator during signaling.
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21. A computer program embodied on a computer-readable medium comprising:
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a first set of instructions for signaling a request for transmission of the Walsh space information; and a second set of instructions for transmitting a special value in place of a channel quality indicator during signaling.
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22. An apparatus for wireless communications comprising:
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means for signaling a request for transmission of the Walsh space information; and means for suppressing the transmission of a channel quality indicator during signaling.
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23. An apparatus for wireless communications comprising:
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means for signaling a request for transmission of the Walsh space information; and means for transmitting a special value in place of a channel quality indicator during signaling.
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Specification