Signaling analysis of contention based bandwidth request mechanism for WiMAX systems with retransmission attempt

摘要

In this paper, we investigate various distributions to compute the signaling cost with contention based bandwidth request mechanism for best effort (BE) services. The code division multiple access (CDMA) based contention resolution is considered for bandwidth request. Previous studies calculated signaling cost with real time polling service (rtPS) and unsolicited grant service (UGS) that perform polling based bandwidth request. The main challenge with best effort (BE) services is the randomness in execution of bandwidth request since successful bandwidth request is made after a number of retransmission attempts. Hence, we investigate various distributions along with ‘m’ retransmission attempts to select appropriate distribution for estimating the signaling cost. The performance of WiMAX network in terms of signaling cost or signaling overhead is studied with varying number of contending stations. Simulations confirm that the geometric distribution will be the best choice in the estimation of signaling cost when contention bandwidth request is performed with WiMAX networks.