Method and apparatus for high rate packet data transmission
First Claim
1. A method for high speed packet data transmission from at least one base station to a mobile station comprising:
- measuring at the mobile station a set of parameters associated with forward link signals from said at least one base station;
selecting at the mobile station a selected base station from said at least one base station based on said set of parameters;
sending a rate control information message from the mobile station to said selected base station at every time slot on a reverse link; and
receiving data at the mobile station from said selected base station at the data rate in accordance with said rate control information message if there is a data packet directed to the mobile station.
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Accused Products
Abstract
In a data communication system capable of variable rate transmission, high rate packet data transmission improves utilization of the forward link and decreases the transmission delay. Data transmission on the forward link is time multiplexed and the base station transmits at the highest data rate supported by the forward link at each time slot to one mobile station. The data rate is determined by the largest C/I measurement of the forward link signals as measured at the mobile station. Upon determination of a data packet received in error, the mobile station transmits a NACK message back to the base station. The NACK message results in retransmission of the data packet received in error. The data packets can be transmitted out of sequence by the use of sequence number to identify each data unit within the data packets.
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Citations
34 Claims
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1. A method for high speed packet data transmission from at least one base station to a mobile station comprising:
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measuring at the mobile station a set of parameters associated with forward link signals from said at least one base station;
selecting at the mobile station a selected base station from said at least one base station based on said set of parameters;
sending a rate control information message from the mobile station to said selected base station at every time slot on a reverse link; and
receiving data at the mobile station from said selected base station at the data rate in accordance with said rate control information message if there is a data packet directed to the mobile station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A transmitter for high speed packet data transmission comprising:
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an encoder for receiving data packets and encoding said data packets into encoded packets;
a frame puncture element for receiving said encoded packets and puncturing a portion of said encoded packets to provided punctured packets;
a variable rate controller connected to said frame puncture element for receiving said punctured packets and demultiplexing said punctured packets into parallel channels;
a Walsh cover element connected to said variable rate controller for receiving said parallel channels and covering said parallel channels with Walsh covers to provide orthogonal channels; and
a gain element connected to said Walsh cover element for receiving said orthogonal channels and scaling said orthogonal channels to provide scaled channels. - View Dependent Claims (26, 30, 31, 32)
a multiplexer connected to said gain element, said multiplexer multiplexing a preamble with said scaled channels to provide Walsh channels.
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31. The transmitter of claim 25 further comprising:
a scrambler interposed between said frame puncture element and said variable rate controller, said scrambler scrambling said punctured packets with a scrambling sequence.
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32. The transmitter of claim 25 wherein said each of said Walsh covers is 16 bits in length.
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27. The transmitter of 25 further comprising:
a multiplexer connected to said gain element, said multiplexer multiplexing pilot and power control bursts with said scaled channels to provide Walsh channels. - View Dependent Claims (28, 29)
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33. An apparatus for high speed packet data transmission from at least one base station to a mobile station comprising:
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means for measuring at the mobile station a set of parameters associated with forward link signals from said at least one base station;
means for selecting at the mobile station a selected base station from said at least one base station based on said set of parameters;
means for sending at every slot on a reverse link a rate control information message from the mobile station to said selected base station at every time slot on a reverse link; and
means for receiving data at the mobile station from said selected base station at the data rate in accordance with said rate control information message if there is a data packet directed to the mobile station.
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34. An apparatus for high speed packet data transmission from at least one base station to a mobile station comprising:
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means for measuring at the mobile station a set of parameters associated with forward link signals from said at least one base station;
means for selecting at the mobile station a selected base station from said at least one base station based on said set of parameters;
means for sending at every slot on a reverse link a rate control information message from the mobile station to said selected base station periodically on a reverse link; and
means for receiving data at the mobile station from said selected base station at the data rate in accordance with said rate control information message if there is a data packet directed to the mobile station.
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Specification