Qos-aware resource allocation for mixed multicast and unicast traffic in OFDMA networks
1 Tsinghua National Laboratory for Information Science and Technology (TNList), Tsinghua University, Beijing 100084, P.R.China
2 Electronic Technology Information Research Institute, MIIT., Beijing 100040, P.R.China
EURASIP Journal on Wireless Communications and Networking 2012, 2012:195 doi:10.1186/1687-1499-2012-195Published: 12 June 2012
This article focuses on the subchannel and power allocation for mixed multicast and unicast traffic in wireless OFDMA networks, where the multicast data is divided into basic layer and enhancement layer data. Our goal is to maximize the network total throughput with a total power constraint while guaranteeing the minimum rate requirements of both the unicast and muticast traffic. A suboptimal allocation algorithm is proposed, which combines a cost-based subchannel allocation with the traditional water filling (TWF) and an advanced water filling (AWF). The TWF is used for the subchannels allocated to satisfy the rate requirements of each unicast traffic and multicast traffic while the AWF is used for the remaining subchannels. Besides, we present an average SNR-based user selection scheme which selects a proper set of multicast users to serve when the minimum rate requirements of all users can not be satisfied. Simulation results show that our proposed algorithm can improve the network throughput and outage probability compared with other algorithms.