Informatics Publishing Limited

D. Satish Kumar ¹, N. Nagarajan ²

Affiliations
1 Kalaignar Karunanidhi Institute of Technology, Coimbatore-641402, Tamil Nadu, IN
2 Coimbatore Institute of Engineering and Technology, Coimbatore-641109, Tamilnadu, IN

Abstract

Two different relay modes are defined in IEEE 802.16j WIMAX standard: transparent mode and non-transparent mode. The non transparent mode is used to extend the coverage area of base stations, where low cost relay station of equal capacity as that of base station is placed at suitable position. Time taken to accept mobile stations and Bandwidth allocation are main problems in non transparent mode. The Transparent mode is used to increase the capacity of the base station within the coverage area of base station.

In this we have studied the IEEE 802.16j standard multi hop relay WIMAX networks. We have used relay stations to extend the coverage of base stations. We have also analyzed the throughput between mobile stations with in the coverage area and outside coverage area of base stations. We have simulated the IEEE 802.16j transparent and non transparent mode multi hop WIMAX relay networks using NCTUns Tool.

Keywords

IEEE 802.16j, Relay Modes, Transparent Mode, Non-Transparent Mode, WIMAX, NCTUns, Throughput etc.

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D. Satish Kumar ¹, N. Nagarajan ²

Affiliations
1 Kalaignar Karunanidhi Institute of Technology, Coimbatore-641402, Tamil Nadu, IN
2 Coimbatore Institute of Engineering and Technology, Coimbatore-641109, Tamilnadu, IN

Abstract

An Adaptive Network Topology Acquisition (A-NTA) Algorithm for IEEE 802.16j non transparent mode relay networks is presented in this paper. We have implemented this algorithm in NCTUns open source network simulator. In this algorithm the process of setting channel ID for mobile stations, and time taken to accept a new mobile station are mainly focused. The mobile stations which are in the coverage area of base station are given first preference, and those outside coverage area are assigned channel ID through relay stations. Two ID’s are set for each mobile station: Basic channel ID [1, 2, 3….] and Primary Channel ID [256, 257, 258…]. Mobile stations are first accepted by base stations, to allocate band width. We have studied the time taken to accept mobile stations. The results show that, base station takes 0.0096613 sec to accept one mobile station (inside coverage area) and it takes 0.065001 sec to accept one mobile station (outside coverage area)- through a relay station . Here 0.085308 sec is spend to accept one relay station.

Keywords

A-NTA Algorithm, IEEE 802.16j, Non-Transparent Mode, Relay Station, Channel ID, NCTUns etc.

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