Space-time diversity-enhanced qos provisioning for real-time service over MC-DS-CDMA based wireless networks
Xi Zhang, Jia Wei Tang · 2005
In order to support the quality of service (QoS) requirements for real-time traffic over broadband wireless networks, advanced techniques such as space-time diversity (STD) and multicarrier direct-sequence code division multiple access (MC-DS-CDMA) are implemented at the physical layer. However, the employment of such techniques evidently affects the QoS provisioning algorithms at the medium access control (MAC) layer. In this paper, we propose a space-time infrastructure and develop a set of cross-layer real-time QoS-provisioning algorithms for admission control, scheduling, and subchannel-allocations. We analytically map the parameters characterizing the space-time diversity onto the admission-control region guaranteeing the real-time QoS. Our analytical analyses show that the proposed algorithms can effectively support real-time QoS provisioning. Also presented are numerical solutions and simulation results showing that the space-time diversity can significantly improve the QoS provisioning for real-time services over wireless networks.