Ulvan, Ardian and Ulvan, Melvi and Bestak, Robert (2017) WiMAX Mesh: Multi-hop Evaluation on MAC Layer Efficiency. Advanves in Electrical and Electronic Engineering, 16 (1). ISSN 1804-3119 (Submitted)

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Abstract

This work focuses on the efficiency analysis of MAC management messages transferred in mesh topology in both centralised and distributed scheduling. We consider the basic IEEE802.16 MAC messages that involve in network admission process. The encountered overhead in the multihop scenario is taking into account. Topology using the Mesh model can be quite varied. The Mesh SS/MS/RS may have direct links between each other and traffic for other Mesh SSs may be routed across these links. There are innumerable possibilities how the topology can look like. Due to the considered MAC overhead and to reduce the complexity, a particular topological model is needed. In this chapter, a tree-like topology is proposed, modelled and simulated, including the assumption of the traffic. It is defined that only the root node (using centralised scheduling terminology – the Mesh BS) is connected to the core network and the end-to-end connections occurs between the Mesh SSs/MSs/RSs and some unspecified nodes outside this network. The connection between individual Mesh SSs is not considered. It means that data for nodes in the lower parts of the tree is routed through the stations/nodes on higher levels. The obtained results showed that the size of mesh frame, the bandwidth, MAC PDU size and several others parameters defined in the standard contributed on the overhead of MAC layer. In respect of the obtained results, several ways of reducing the MAC overhead can be made. The use of Mesh mode would be a waste of resources when majority of the traffic is Point to Multipoint (PMP) and transforming the network to PMP mode does not represent a vital problem. On the other hand, the Mesh mode is a good option when not so many subscriber stations are employed and building a PMP network would be too complicated. The selection of the right scheduling method is also crucial when considering the Mesh mode. Based on this work, centralised scheduling brings less overhead than the distributed mechanism. Nevertheless it introduces a single point of failure, which is the Mesh BS responsible for schedule assignments. The distributed scheduling showed lower efficiency when calculating the overhead for presented scenarios in comparison to the centralised one, but if the traffic takes place mainly between individual Mesh subscriber stations, the efficiency may be better. The result, finally, also determined the maximum number of applicable hops that still fit the performance requirements of the system

Item Type:	Article
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:	Fakultas Teknik (FT) > Prodi Teknik Elektro
Depositing User:	ARDIAN ULVAN
Date Deposited:	16 Nov 2017 06:54
Last Modified:	16 Nov 2017 06:54
URI:	http://repository.lppm.unila.ac.id/id/eprint/5687

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