Patent ID: 8054852

Claim:
A communication terminal used in a mobile communication system complying with a carrier sense multiple access scheme and including a plurality of communication terminals that transmit wireless packets according to the same periodicity based on a respective different timing, the communication terminal comprising: a receiving unit configured to receive a wireless packet transmitted by another communication terminal or a base station; a determination unit configured to extract a destination address of the wireless packet that is sent from the base station to the another communication terminal, and compare a numerical value of the destination address of the another communication terminal with a numerical value of an address of the communication terminal so as to determine a transmission timing of the communication terminal based on an order of sizes of the numerical value of the destination address of the another communication terminal and the numerical value of the address of the communication terminal determined as the result of the comparison; a transmission unit configured to periodically transmit wireless packets to the base station based on the transmission timing; and a re-synchronization request transmission unit configured to transmit a re-synchronization signal to communication terminals when a packet error rate exceeds a predetermined value, wherein each communication terminal that receives the re-synchronization signal compares a numerical value of a destination address of a packet transmitted by another communication terminal with a numerical value of an address of the communication terminal that receives the re-synchronization signal so as to determine a transmission timing of the communication terminal that receives the re-synchronization signal based on an order of sizes of the numerical values as the result of the comparison, and wherein the determination unit re-determines the transmission timing when receiving a re-synchronization signal from another communication terminal.