| Summary: | 碩士 === 國立中正大學 === 資訊工程研究所 === 101 === The vehicular ad hoc network (VANET) is a particular class of traditional mobile ad-hoc network (MANET) in which the mobile hosts are the vehicles with high mobility. The vehicles equipped with wireless transceiver can communicate with other vehicles (V2V) or communicate with roadside units (RSUs) (V2R). There are several classes of applications proposed in VANET: (1) safety related (2) convenience and entertainment related (3) commercial related (4) Internet access. The RSUs as gateway nodes are the entry point to the Internet for vehicles. Therefore, it is highly that some RSSUs with heavy loads are saturated. Moreover, due to the prohibitive cost of deploying a large number of RSUs, there are usually few RSUs deployed in the VANET. Vehicles can utilize multi-hop manner to transmit their requests to RSU and receive data from RSU. The routing length between a vehicle and its serving RSU is important, because a longer distance means that the end to end delay increases and packet delivery ratio decreases. Vehicles usually choosing a nearer RSU as their entry point to Internet results in that some of RSUs are overloaded but some not. That is, some of the RSUs may experience heavy traffic and are saturated. Load balancing method is essential to distribute the load among RSUs. In this paper, we study the problem that how to balance the load of RSUs deployed sparsely to provide Internet access for vehicles in the urban environment. We first propose a RSU-based method to divide the urban environment into several sub-regions and only one RSU residences in each sub-region. RSU provides Internet access service for vehicles in its sub-region and the boundaries between these sub-regions will change dynamically. Second, we proposed a Vehicle-based, which lets vehicle choose its service RSU distributedly with taking the future locations into consideration to prevent vehicles from changing their serving RSUs frequently.
|
|---|
