1,295 research outputs found
Experimental assessment of RRM techniques in 5 GHz dense WiFi networks using REMs
“© 2018 IEEE. Personal use of this material is permitted. Permission
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media, including reprinting/republishing this material for advertising or
promotional purposes, creating new collective works, for resale or
redistribution to servers or lists, or reuse of any copyrighted
component of this work in other works.”The increasing acceptance of WiFi has created
unprecedented levels of congestion in the unlicensed frequency
bands, especially in densely populated areas. This results mainly
because of the unmanaged interference and uncoordinated op-
eration between WiFi access points. Radio Environment Maps
(REM) have been suggested as a support for coordination
strategies that optimize the overall WiFi network performance.
In this context, the main objective of this experiment is to assess
the benefit of a coordinated management of radio resources in
dense WiFi networks at 5 GHz band, using REMs for indoor
scenarios. It was shown that REMs can detect the presence of
interfering links on the network or coverage holes, and a suitable
coordination strategy can use this information to reconfigure
Access Points (AP) channel assignment and re-establish the client
connection, at a cost of diminishing the aggregate throughput
of the network. The technique of AP hand-off was tested to
balance the load from one AP to another. Using REMs, the Radio
Resource Management (RRM) strategy could reconfigure the
network to optimize the client distribution among available APs.
Although the aggregate throughput is lower after load balancing,
the RRM could increase the throughput of the overloaded AP.info:eu-repo/semantics/publishedVersio
Scalability study of backhaul capacity sensitive network selection scheme in LTE-wifi HetNet
Wireless Heterogeneous Network (HetNet) with small cells presents a new backhauling challenge which differs from those of experienced by conventional macro-cells. In practice, the choice of backhaul technology for these small cells whether fiber, xDSL, point–to-point and point-to-multipoint wireless, or multi-hop/mesh networks, is often governed by availability and cost, and not by required capacity. Therefore, the resulting backhaul capacity of the small cells in HetNet is likely to be non-uniform due to the mixture of backhaul technologies adopted. In such an environment, a question then arises whether a network selection strategy that considers the small cells’ backhaul capacity will improve the end users’ usage experience. In this paper, a novel Dynamic Backhaul Capacity Sensitive (DyBaCS) network selection schemes (NSS) is proposed and compared with two commonly used network NSSs, namely WiFi First (WF) and Physical Data Rate (PDR) in an LTE-WiFi HetNet environment. The proposed scheme is evaluated in terms of average connection or user throughput1and fairness among users. The effects of varying WiFi backhaul capacity (uniform and non-uniform distribution), WiFi-LTE coverage ratio, user density and WiFi access points (APs) density within the HetNet form the focus of this paper. Results show that the DyBaCS scheme generally provides superior fairness and user throughput performance across the range of backhaul capacity considered. Besides, DyBaCS is able to scale much better than WF and PDR across different user and WiFi densities
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