Research On Routing And Channel Assignment For Hybrid Wireless-Optical Broadband Access Network

The growing demands for bandwidth-intensive services are accelerating the need to design an efficient"last mile"access network in a cost-effective manner. Traditional services such as voice,video,Internet and wireless or premium applications such as multimedia,interactive gaming need to be delivered over the access network to the end users with a economical way. However, besides its high transport capacity, today's access network should bring operational efficiency, e.g. mobility to end users. So a novel hybrid network– wireless-optical broadband access network (WOBAN)– a combination technology of high-capacity optical access and untethered wireless access is gaining more and more attention.In this paper begins with a short introduction to access network. Chapter 2 discusses WOBAN's architecture, advantages and challenges. Then some routing algorithms in WOBAN are discussed, analyze the principle of these algorithms. Then in Chapter 4 Link Capacity and Delay Sensitive Routing (LCaDSR) is proposed. The results show that when the load is high, the new algorithm can effectively low the delay. Chapter 5 describes the channel assignment of WOBAN with multi-radio and multi-channel. In this chapter the impact of multi-radio in the WOBAN's wireless part and how to choose the nodes with multi-radio are first analyzed. Then we assign the channels based on the flows by CPLEX, the results show that the performance (such as delay, load balance) of WOBAN is improved.