Subproxy-finding model in UCAN network architecture based on Rectangle shaped area

In third-generation (3G) wireless data networks, mobile users experiencing poor channel quality usually have low data-rate connections with the base-station. Providing service to low data-rate users is required for maintaining fairness, but at the cost of reducing the cell´s aggregate throughput. Some researchers proposed for enhancing cell throughput, while maintaining fairness. In UCAN[1], a mobile client has both 3G cellular link and IEEE 802.11-based peer-to-peer links. The 3G base station forwards packets for destination clients with poor channel quality to proxy clients with better channel quality. The proxy clients then use an ad-hoc network composed of other mobile clients and IEEE 802.11 wireless links to forward the packets to the appropriate destinations, thereby improving cell throughput. But this network architecture is not classic and has some disadvantages. Once a client has high data-rate connections with the base-station, it will always be selected to be proxy because of the average downlink channel rate that remains stable in a relatively larger time scale (in seconds or more depending on the moving speed of the mobile client). Accordingly, the energy consumption of this client will increase quickly. By all appearances, it is not fair and will make this client disabled with its energy used up. So in this paper, we will put forward a new architecture model as complement to increase the performance of UCAN network architecture named SUCAN (UCAN network architecture based on Subproxy-finding). This paper gives a minute discussion about the concept and application of Subproxy-finding. The theoretic analysis and extensive simulations show that it will extend the life-span of proxy and reduce overall energy consumption in the network.