Uplink synchronization request method in mobile communication system, CDMA allocation IE thereof, and apparatus using the same
First Claim
1. A method for a portable subscriber station to request uplink synchronization in a mobile communication system, the method comprising:
- performing initial ranging with a base station and storing an initial timing value;
determining, by the portable subscriber station (PSS), whether an uplink synchronization timing error occurs if uplink traffic is generated;
calculating, after moving, by the portable subscriber station, a timing adjustment value based on a difference between the initial timing value and an arrival time of a downlink preamble of a frame received from the base station without further ranging if the uplink synchronization error occurs; and
transmitting, by the portable subscriber station, a bandwidth request code, including the calculated timing adjustment value, to a base station to request a bandwidth.
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Abstract
The present invention relates to an uplink synchronization request method in a mobile communication system, a CDMA allocation information element structure thereof, and an apparatus using the same. For this purpose the uplink synchronization request method includes: when uplink traffic is generated, determining whether an uplink synchronization error occurs; when the uplink synchronization error occurs, calculating a timing adjustment value; and transmitting a bandwidth request code including the calculated timing adjustment value to a base station and performing a bandwidth request. According to the present invention, the PSS compares a reference adjustment value and an arrival time of a downlink preamble to calculate uplink synchronization timing and synchronize an uplink of the PSS that requests bandwidth allocation through a bandwidth request ranging process to thereby maximize resource use efficiency in the uplink synchronization.
18 Citations
10 Claims
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1. A method for a portable subscriber station to request uplink synchronization in a mobile communication system, the method comprising:
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performing initial ranging with a base station and storing an initial timing value; determining, by the portable subscriber station (PSS), whether an uplink synchronization timing error occurs if uplink traffic is generated; calculating, after moving, by the portable subscriber station, a timing adjustment value based on a difference between the initial timing value and an arrival time of a downlink preamble of a frame received from the base station without further ranging if the uplink synchronization error occurs; and transmitting, by the portable subscriber station, a bandwidth request code, including the calculated timing adjustment value, to a base station to request a bandwidth. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification