The Design And Implementation Of A High Performance Ad Hoc Routing Protocol

In the recent years, wireless technology has developed tremendously to satisfy the need of communicating freely. One of the fields of wireless technology is mobile ad hoc networks (MANET) where the participating nodes do not relay on any existing infrastructure. And the dramatic change of topology and the feature of decentralization impress us. Due to the nature of mobile ad hoc networks, the traditional routings are out of date. Many routing algorithms have been presented for this special environment. And AODV is excellent one among others for the idea of on-demand which is adaptive to the characteristics of ad hoc. In this paper, we present a novel routing algorithm called HPRT.HPRT uses the idea of on-demand which is also used in AODV. Beside of that, HPRT also takes link loss and energy issues into account. Through the link metric consideration, HPRT minimizes the total number of packet transmissions (including retransmissions) required to successfully deliver a packet to the ultimate destination. That results in the lower level energy consuming. Furthermore, the energy balancing mechanism maximizes the time keeping network connectivity. Thus, we can get the higher throughput of ad hoc networks with the same amount of energy. To achieve the purpose of reflecting the real wireless environment, we developed a position based error model in NS-2.In this model, error rate of link varies with the position of the nodes which belongs to the link. However, the position aware mechanism is not implemented in NS-2. So we use statistic method to accomplish it and get the satisfied result. Another part of error model is interfering error model which is not finished in our project. But the general idea and some codes are given. Beside of these, we also give the suggestion in architecture of NS-2 for error model. All the experiment result is acquire through the NS-2. To get the same sequence random variable, we use the feature of "seed"in NS-2 library.And we change the "seed"to get the different sequence random variable.At last, HPRT improves throughput rate which compares AODV by 73.85%.The startling number is due to the severe environment (link error rate).