A wireless packet transmission with adaptive processing gain and transmitter power control scheme for circuit-switched and packet-switched modes integrated DS/CDMA systems

摘要

This paper proposes a wireless packet transmission scheme with adaptive processing gain (PG) and transmitter power control (TPC) techniques for circuit-switched and packet-switched modes integrated direct sequence/code division multiple access (DS/CDMA) systems. In the proposed DS/CDMA systems, as radio resource of both packet-switched and circuit-switched services is easily and dynamically controlled only by the adjustment of the received power level of both services, the proposed algorithm controls processing gain and transmitter power of the packet-switched services according to the channel load of each base station (BS). Moreover, only an open loop transmitter power control with a power margin is employed in the packet-switched mode to effectively utilize the capture effect as well as to simplify power control algorithm. Computer simulation confirms that, at the input traffic of 0.8 erl/cell, the message delay in the packet-switched mode can be decreased about 1/5 without decreasing so much the capacity of circuit switched services.