Patent ID: 6415152
Filing Date: 2002-07-02
Classification: H04W

Abstract:
In a method for operating a CDMA base station which partition a speech radius wider than that limited in timing by a modem ASIC of said base station into first and second speech spheres by a predetermined unit below the maximum speech radius allowed by said base station modem ASIC to enlarge the limited speech radius, said base station having a first signal processor for processing forward link channels from said base station to mobile stations in said first and second speech spheres and reverse link channels from said mobile stations in said first speech sphere to said base station and a second signal processor for processing reverse link channels from said mobile stations in said second speech sphere to said base station, a method for solving a speech disable state based on the movement of a specific mobile station located in said first speech sphere to said second speech sphere, comprising the steps of:a) allowing a clock generator to generate first and second EVEN SECOND clocks, said second EVEN SECOND clock being delayed from said first EVEN SECOND clock by the maximum bidirectional propagation delay value of said first speech sphere, and allowing said first and second signal processors to receive said first and second EVEN SECOND clocks from said clock generator, respectively; b) allowing said first signal processor to assign pilot, synchronization and paging channels synchronously with said first EVEN SECOND clock and transmit them to all speech spheres covered by said base station; c) if an access channel is sent from said specific mobile station located in said first speech sphere, allowing said first signal processor to detect and demodulate said access channel synchronously with said first EVEN SECOND clock; d) allowing said first signal processor to assign a traffic channel synchronously with said first EVEN SECOND clock and transmit it to said specific mobile station in said first speech sphere; e) if a reverse traffic channel is sent from said specific mobile station in said first speech sphere, allowing said first signal processor to detect and demodulate said reverse traffic channel synchronously with said first EVEN SECOND clock; f) allowing said first signal processor to measure a first bidirectional propagation delay time with said specific mobile station at an interval of predetermined time and compare the measured first bidirectional propagation delay time with a first threshold value; g) allowing said first signal processor to repeatedly measure said first bidirectional propagation delay time if said first bidirectional propagation delay time is smaller than said first threshold value at said step f) and, if said first bidirectional propagation delay time is greater than or equal to said first threshold value at said step f), allowing said first signal processor to subtract said maximum bidirectional propagation delay value of said first speech sphere from said first bidirectional propagation delay time and set the subtracted result as a second bidirectional propagation delay time; h) allowing said second signal processor to detect and demodulate said reverse traffic channel from said specific mobile station synchronously with said second bidirectional propagation delay time; i) allowing said first signal processor to compare said first bidirectional propagation delay time with a second threshold value; and j) selecting and utilizing said reverse traffic channel demodulated by said second signal processor if said first bidirectional propagation delay time is greater than or equal to said second threshold value at said step i).