Resource optimization of CDMA systems for supporting integrated voice and data traffic

Supporting Integrated Voi e-Data TraÆ Mainak Chatterjee and Sajal K. Das Center for Resear h in Wireless Mobility and Networking (CReWMaN) Department of Computer S ien e and Engineering University of Texas at Arlington Arlington, TX 76019 E-mail:f hat,dasg se.uta.edu Abstra t In this paper, we optimize the usage of both ontrol and traÆ hannels of a CDMA system by swit hing the MAC states of a servi e. In parti ular, we nd the optimal transition timers for a dma2000 system supporting integrated voi e and data traÆ . This is a hieved by optimizing a omposite performan e metri de ned as a multiobje tive fun tion of hannel utilization, waiting time and the saving in the signalling overhead. First, we try to hara terize wireless data as a mix of of Poisson-distributed voi e pa kets and Pareto-distributed data pa kets, and study the e e t of the omposition of the mix and the shape parameter of Pareto distribution on the system performan e. Then we derive analyti al expressions for the omposite performan e metri with an aim to obtain the optimal values of expiration timers at whi h the MAC states should be swit hed su h that the system performan e is maximized. Sin e a losed form solution ould not be obtained due to the trans endental nature of the expressions, simulation experiments are ondu ted to on rm the analysis.