Resource allocation schemes for high speed wireless access networks

grantor: University of TorontoThe focus of this thesis is to efficiently allocate the radio resources in novel ways to achieve performance benefits in CDMA systems through proper channel access control techniques. The capacity of the integrated services with different data rates and quality of service requirements is analyzed. It is first shown that the system performance deteriorates when voice and high data rate services are integrated. To improve the system performance, a channel access control technique for delay insensitive high data rate traffic is proposed. Resource allocation and scheduling schemes are proposed and studied for a system with only high data rate Internet users. The scheduling schemes exploit the packet mode transmission to achieve better performance in the time-slotted systems where rates are allocated according to the channel conditions. These schemes are compared in terms of throughput and delay, and also fairness in the allocated data rates. It is shown that the overall system performance is severely affected by the adverse channel conditions seen by a few users. To improve the system performance, a technique is proposed that identifies and delays the transmission for such users until the conditions improve. A time reuse cluster size of three cells is considered to minimize the interference. When the cluster size is larger than one cell, the transmission from neighboring base stations must be coordinated. To efficiently reuse the time, algorithms are developed for best-effort and real-time services. A dynamic time share allocation algorithm is proposed and studied that can uniquely coordinate the transmission time for high data rate Internet users in time reuse clusters larger than one cell. A time slot assignment scheme is also proposed and studied for real-time high data rate services. It efficiently packs and dynamically allocates the time slots so that the call blocking probability is lower than various fixed and dynamic schemes in all traffic conditions.Ph.D