Synchronization establishment circuit and synchronization establishment method

摘要

A terminal is wirelessly connected to a base station. The terminal has a timer and a controller. The timer has a register for storing a beacon interval as a comparison value. The timer also includes a beacon counter for counting timer clocks. The timer also includes a comparator for generating an interrupt signal when an output value of the register and a count value of the counter match. The controller causes the counter to start counting when it receives a beacon for the first time. The controller causes the register to store the count value of the beacon counter when it receives a beacon next time. Since the beacon interval is measured using the timer clock in the terminal, instead of using the beacon interval information included in the beacon, it is unnecessary to strictly match the clock precision of the base station and the terminal, and therefore the cost of the system decreases.