Reservation multiple access
First Claim
1. A method for accessing a base station from a mobile station in a communication system, comprising:
- selecting a signature sequence from a plurality of signature sequences;
modulating said selected signature sequence with a request portion of an access probe;
transmitting said modulated request portion over a reverse link common control channel;
receiving a channel assignment message from said base station designating a reserved access channel, said reserved access channel providing communication with a low probability of contention and said channel assignment message reflecting said selected signature;
transmitting a message portion of said access probe over said reserved access channel;
receiving a power control command over a forward link channel associated with said reserved access channel; and
responding to said power control command by increasing or decreasing a power level at which said mobile station transmits said message portion.
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Accused Products
Abstract
A mobile station accesses a base station by randomly selecting a first reverse link common control channel from a set of random access channels. The mobile station transmits a request portion of an access probe over the first reverse link common control channel. The request portion is subject to collision with other signals. The request portion comprises a hash identification which is derived from a uniquely identifying number using a hash function. The hash identification quasi-uniquely identifies the mobile station. The mobile station receives a channel assignment message from the base station designating the hash identification and a reserved access channel. The reserved access channel provides communication with a low probability of contention. The mobile station transmits a message portion of the access probe over the reserved access channel.
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Citations
8 Claims
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1. A method for accessing a base station from a mobile station in a communication system, comprising:
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selecting a signature sequence from a plurality of signature sequences;
modulating said selected signature sequence with a request portion of an access probe;
transmitting said modulated request portion over a reverse link common control channel;
receiving a channel assignment message from said base station designating a reserved access channel, said reserved access channel providing communication with a low probability of contention and said channel assignment message reflecting said selected signature;
transmitting a message portion of said access probe over said reserved access channel;
receiving a power control command over a forward link channel associated with said reserved access channel; and
responding to said power control command by increasing or decreasing a power level at which said mobile station transmits said message portion. - View Dependent Claims (2)
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3. An apparatus for accessing a base station from a mobile station in a communication system, comprising:
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means for selecting a signature sequence from a plurality of signature sequences;
a modulator for modulating said selected signature sequence with a request portion of an access probe;
a transmitter for transmitting said modulated request portion over a reverse link common control channel;
a receiver for receiving a channel assignment message from said base station designating a reserved access channel, said reserved access channel providing communication with a low probability of contention and said channel assignment message reflecting said selected signature;
said transmitter further for transmitting a message portion of said access probe over said reserved access channel;
said receiver further for receiving a power control command over a forward link channel associated with said reserved access channel; and
means for responding to said power control command by increasing or decreasing a power level at which said mobile station transmits said message portion. - View Dependent Claims (4)
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5. A method for accessing a base station from a mobile station in a communication system, comprising:
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receiving a modulated request portion over a reverse link common control channel, wherein modulated request portion is modulated with a selected signature sequence;
transmitting a channel assignment message from said base station designating a reserved access channel, said reserved access channel providing communication with a low probability of contention and said channel assignment message reflecting said selected signature;
receiving a message portion of said access probe over said reserved access channel;
transmitting a power control command over a forward link channel associated with said reserved access channel for increasing or decreasing a power level at which said mobile station transmits said message portion. - View Dependent Claims (6, 8)
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7. An apparatus for accessing a base station from a mobile station in a communication system, comprising:
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a receiver for receiving a modulated request portion over a reverse link common control channel, wherein modulated request portion is modulated with a selected signature sequence;
a transmitter for transmitting a channel assignment message from said base station designating a reserved access channel, said reserved access channel providing communication with a low probability of contention and said channel assignment message reflecting said selected signature;
said receiver further for receiving a message portion of said access probe over said reserved access channel;
said transmitter further for transmitting a power control command over a forward link channel associated with said reserved access channel for increasing or decreasing a power level at which said mobile station transmits said message portion.
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Specification