On the Optimum Number of Hops in a Multi-Hop DS-CDMA Virtual Cellular Network using On-Demand Channel Assignment

摘要

A multi-hop virtual cellular network (VCN) was proposed for future mobile communication systems. In VCN, there are two methods of channel assignment; the pre-assignment and on-demand channel assignment. In this paper we will give a simple comparison of the two methods and give a reason why we will focus our research on the on-demand channel assignment from now-on. In a multi-hop VCN using on-demand channel assignment, increasing the number of hops leads to a less transmit power of the multi-hop links and hence to a decreased interference to other users, this can decrease the call blocking probability. On the other hand, increasing the number of the call links might increase the blocking probability of this call. In this paper, we give an analysis about this tradeoff and show the impact of the number of hops on the blocking probability of a DS-CDMA multi-hop VCN. Simulation results are presented to show that there is an optimum value of number of hops depending on some network conditions.