Reservation multiple access

• US 6,987,982 B2
• Filed: 06/22/2004
• Issued: 01/17/2006
• Est. Priority Date: 03/24/1999
• Status: Expired due to Term

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Vanghi, Vieri, Willenegger, Serge, Walton, Rod J.
• Primary Examiner(s): Trost, William
• Assistant Examiner(s): ZEWDU, MELESS NMN
• Application Number:
  US10/874,562
• Publication Number:
  US 20040233870A1
• Time in Patent Office: 574 Days
• Field of Search: 455/422.1, 455424-425, 455/434, 455/435.2, 455/450, 455/453, 455/455, 455/466, 455509-511, 455515-517, 455/245.1, 455/254, 455/456.5, 455463-464, 455/512, 455/522, 455524-526, 455/550.1, 455/561, 455/127.1, 455/456.6, 370328-329, 370/335, 370342-343, 370/348, 370/318, 370/322, 370/437, 370443-444, 370/445, 370/447, 370461-462, 370/247, 370/271
• US Class Current: 455/515
• CPC Class Codes: H04W 52/223 predicting future states of the transmission
• CPC Class Codes: H04W 52/32 TPC of broadcast or control channels
• CPC Class Codes: H04W 52/50 at the moment of starting communication in a multiple access environment
• CPC Class Codes: H04W 52/60 using different transmission rates for TPC commands
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/002 Transmission of channel access control information
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access

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.

Claims

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.

2. The method of claim 1, wherein said transmitting said message portion occurs at one of a plurality of available data rates.

3. The method of claim 1, wherein said request portion comprises an identification which quasi-uniquely identifies a transmitter of said request.

4. The method of claim 3, further comprising determining said identification which quasi-uniquely identifies said transmitter of said request from a unique identifying number associated with said transmitter of said request using a hash function.

5. The method of claim 3, further comprising randomly selecting said identification which quasi-uniquely identifies said transmitter of said request.

6. An apparatus for accessing a base station from a mobile station in a communication system, comprising:

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.

7. The apparatus of claim 6, wherein said transmitter further for transmitting said message portion at one of a plurality of available data rates.

8. A method for accessing a base station from a mobile station in a communication system, comprising:

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 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.

9. The method of claim 8, wherein said receiving said message portion occurs at one of a plurality of available data rates.

11. The apparatus of claim 8, wherein said receiver further for receiving said message portion at one of a plurality of available data rates.

10. An apparatus for accessing a base station from a mobile station in a communication system, comprising:

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 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.