This paper addresses the problem of dynamic resource allocation in a multiservice direct-sequence code-division multiple-access (DS-CDMA) wireless network supporting real-time (RT) and nonreal-time (NRT) communication services. For RT users, a simple transmission power allocation strategy is assumed that maximizes the amount of capacity available to NRT users without violating quality of service requirements of RT users. For NRT users, a joint transmission power and spreading gain (transmission rate) allocation strategy, obtained via the solution of a constrained optimization problem, is provided. The solution maximizes the aggregate NRT throughput, subject to peak transmission power constraints and the capacity constraint imposed by RT users. The optimization problem is solved in a closed form, and the resulting resource allocation strategy is simple to implement as a hybrid CDMA/time-division multiple-access strategy. Numerical results are presented showing that the optimal resource allocation strategy can offer substantial performance gains over other conventional resource allocation strategies for DS-CDMA networks.
Bibliographical noteFunding Information:
Manuscript received April 10, 2002; revised August 3, 2002; accepted September 9, 2002. The editor coordinating the review of this paper and approving it for publication is E. Hossain. This work was supported in part by the United States Army Research Office under Grant DAAH04-96-1-0177. This paper was presented in part at the IEEE Communications Theory Workshop, Aptos, CA, 1999, in part at the ACM/IEEE 5th Annual International Conference on Mobile Computers and Networking, Seattle, WA, 1999, and in part at the IEEE Wireless Communications and Networking Conference, New Orleans, LA, 1999.
- Code division multiple access (CDMA)
- Power control
- Rate control
- Resource management
ASJC Scopus subject areas
- Computer Science Applications
- Electrical and Electronic Engineering
- Applied Mathematics