Dynamic resource allocation algorithm of cross-layer based on evidence theory for multi-service OFDM system

A media access control (MAC) layer dispatch strategy based on D-S evidence theory is proposed towards OFDM system. The strategy adopts three evaluation indexes to judge packet scheduling priority which including time delay, rate fairness and packet loss ratio. Through selecting membership function for every evaluation indicator, the value of basic probability assignment is gained, and the three evaluation indicators for judging are merged using the combination rule of D-S evidence theory. Then the results of judgment are delivered to physical layer as layer information. According to the controlling parameter offered by MAC layer, physical layer accomplishes the allocation of sub-carrier wave, power and bit, as well as cross-layer resource allocation. By means of establishing power line communication (PLC) system model, simulation is conducted. Comparing with contemporary cross-layer resource allocation algorithm, the results indicate that the proposed algorithm can allot resources dynamically, and meet the demands of multi-service users as well as ensure system performance.