Abstract

Network deployment problem is one of the major issues when base stations and relay stations are jointly deployed. Deploying relay station at suitable position covers throughput enhancement and coverage extension problem in IEEE 802.16j MMR networks. In this paper we have proposed a new adaptive model for throughput enhancement and optimal relay selection in IEEE 802.16j MMR networks and studied about the average output/input throughput. A group of mobile stations are connected to base stations which are moving at a speed of 20 m/s. The Mobile Station is initially placed near to Base station and is moving away from Base station. The average throughput achieved without a relay station is 6.193 Mbits/s and the average throughput achieved with Relay Station is 9.867 Mbits/s. There is 37.2318% increase in the throughput by placing a transparent mode relay Station at suitable position. This paper also discusses optimal relay selection when a group of relay stations are deployed, the user is allowed to select an appropriate relay transmission that provides her required bandwidth and less cost. The mobile station selects a suitable relay station from the group of relay station.

Key words: NCTUns, Institute of Electrical and Electronics Engineers 802.16j, relay modes, optimal relay placement, worldwide interoperability for microwave access.