Throughput Enhancement in IEEE 802.16j Mobile Multi-hop Relay (MMR) Networks

Abstract

IEEE 802.16 standard is created to compete with cable access networks. In the beginning end users are immobile and have a line of sight with base station, now it moved to mobile non line of sight (NLOS) with the new standard IEEE 802.16e and IEEE 802.16j. The new IEEE 802.16j standard which is an amendment to IEEE 802.16e is mobile multi hop relay (MMR) specification for wireless networks.

In this paper we have proposed a new model for throughput enhancement, optimal relay placement and spatial reuse techniques. We have used four mobile stations (T-MS) connected to transparent mode base station (TMR-BS), which are moving at a speed of 20 m/sec. The T-MS are initially placed near to TMR-BS and are moving away from TMR-BS. The average throughput achieved without relay T-RS is 800 Kbps and the average throughput achieved with relay T-RS is 1300 Kbps. There is 40 % increase in the throughput by placing transparent mode relays T-RS at suitable position.