Efficient relay station placement strategy for broadband wireless networks - 4G

Abstract

WiMAX (Worldwide interoperability for Microwave Access) is the emerging broadband wireless access technology that allows interoperability and combines the benefits offered by other wireless networking technologies. This allows WiMAX to lead the path towards 4G. To meet the growing demand for throughput, and in order to relay traffic for Subscriber Stations (SS), Relay station (RS) is introduced by WiMAX networks. The coverage area of a Base Station (BS) can be extended by RSs. It is not easy to install many BSs which involve more cost and infrastructure this type of architecture is suitable for rural areas. The problem of finding location to place the RS exists in these broadband WiMAX networks. To solve this problem, an efficient RS placement strategy is proposed in this work. The RS placement will increase the throughput of the network. For the given MS distribution this algorithm will give the efficient results for the relay location planning. The throughput is to be improved further by taking into account the frequency reuse concept and the inter-cell interference caused due to it. The simulation result depicts the performance of the proposed algorithm.

Energy‐efficiency maximisation for cooperative and non‐cooperative OFDMA cellular networks—a survey

“…In , an iterative RS placement algorithm for multicell WiMAX systems is proposed, in which the RS that provides the higher capacity gain at each iteration is selected. Instead of choosing a placement radius, the RSs can be placed in any candidate position associated to an annular section of each cell, which begins at the limit of BS coverage area, which corresponds to the area where the BS is able to provide sufficient quality for the MSs.…”

“…Most of the RS selection algorithms focus on capacity enhancement . For example, in , users only use the RSs if the achieved SE is lower than a specified threshold, while in , the users that cannot achieve the minimum SE defined as the QoS metric must deploy RSs‐aided link; herein, the criterion of the RS selection is based on channel gain quality.…”

“…In [83], an iterative RS placement algorithm for multicell WiMAX systems is proposed, in which the RS that provides the higher capacity gain at each iteration is selected. || In this work, the relay placement is carried out in a ring area and not in an circumference, but the method is almost the same.…”

“…Despite its simplicity, this approach can result in overloaded/underloaded RSs and the selection of non-optimal RSs, because qualitative metrics have not been considered. Another simple procedure in relay assignment has been suggested in [83]; indeed, when an RS is deployed in a given iteration, the users that lay in the RS coverage area are allocated to it and then removed by the allocation algorithm to avoid coverage by a second RS. Most of the RS selection algorithms focus on capacity enhancement [71,72,[81][82][83].…”

“…Another simple procedure in relay assignment has been suggested in [83]; indeed, when an RS is deployed in a given iteration, the users that lay in the RS coverage area are allocated to it and then removed by the allocation algorithm to avoid coverage by a second RS. Most of the RS selection algorithms focus on capacity enhancement [71,72,[81][82][83]. For example, in [82], users only use the RSs if the achieved SE is lower than a specified threshold, while in [81], the users that cannot achieve the minimum SE defined as the QoS metric must deploy RSsaided link; herein, the criterion of the RS selection is based on channel gain quality.…”