Patent ID: 6332079
Filing Date: 2001-12-18
Classification: H04W

Abstract:
A service area expansion method for a mobile communication system including a TFC (time & frequency controller), a first delay for counting a system clock output from said TFC and outputting an even second clock delayed by a predetermined time in accordance with the counted value, a second delay for delaying said even second clock and said delayed even second clock output from said first delay, respectively, and generating a first and a second interrupt signals of 80 msecond ticks, a CPU for generating an interrupt using said first and second interrupt signals generated from said second delay and generating a first and a second enable signals, a normal area CS;M ASIC which is enabled by the said enable signal output from said CPU, operates in accordance with said even second clock output from said TFC, and processes a call of a mobile terminal in said normal area, and an extended area CSM ASIC which is enabled by said second enable signal output from said CPU, operates in accordance with said delayed even second clock output from said first delay, and processes a call of a mobile terminal in said extended area, said method comprising:a first step of initializing said normal area CSM ASIC using said even second clock output from said TFC, said extended area CSM ASIC using said delayed even second clock output from said first delay in accordance with a re-synchronization command for said normal area CSM ASIC and extended area CSM ASIC and which is output from said CPU, receiving from a control station a configuration for channel allocation for each CSM ASIC, and determining whether a channel to be allocated is a traffic channel or an access channel;a second step of setting up a pair of said two CSM ASICs to a traffic channel or an access channel if said channel to be allocated is determined as a traffic channel or an access channel in said first step, and advancing a forward timing by a delayed reference clock; anda third step of setting up only said normal area CSM ASIC to a corresponding channel if said channel to be allocated is not determined as a traffic channel or an access channel in said first step.