Analysis and Performance Evaluation of IEEE 802.16 Enhanced with Decentrally Controlled Relays

In order to enhance throughput and to extend coverage of wireless networks based on IEEE 802.16 standards, relay stations may be implemented. This paper primarily focuses on decentrally controlled relays when a relay itself schedules all transmissions for its subordinate stations. Needed system resources are allocated to individual relays by means of already defined scheduling services such as UGS, rtPS or ertPS. The paper analyzes suitability of scheduling services. Studied performance metrics include system throughput, signaling overhead and packet delay depending on offered traffic load. The obtained results indicates that ertPS service considerably outperform UGS or rtPS.