Performance of contention processing schemes for WDM networks with control channels

In this paper, four contention processing schemes are studied for a single-hop wavelength division multiplexing (WDM) network with control channels. In order to improve the performance of the network while avoiding the electronic bottleneck, we propose two novel contention processing schemes: local collision blocking (LCB) and local collision blocking-contention resolution (LCB-CR) schemes. We also consider two other schemes: pure contention and contention resolution unit-only (CRU-only) as the lower and the upper performance bounds, respectively. Applying these four schemes to the delayed-ALOHA access protocol (Mehravari, 1990), we analyze the performances of these four schemes under a finite population model and asymmetric conditions. We also take account of receiver collision in the analysis. From the comparison, we find that the proposed schemes are effective in achieving significant performance improvement with moderate system complexity. In order to design the system properly, we consider the effects of various parameters by numerical results.