Dynamic backhaul sensitive Network Selection Scheme in LTE-WiFi wireless HetNet

Abstract

Small-cell deployment within a wireless Heterogeneous Network (HetNet) presents backhauling challenges that differ from those of conventional macro-cells. Due to the lack of availability of fixed-lined backhaul at desired locations and due to cost saving reasons, operators may deploy a variety of backhaul technologies in a given network, combining available technologies such as fiber, xDSL, wireless backhaul and multihop mesh networks to backhaul small-cells. As a consequence, small-cells capacity may be non-uniform in the HetNet. Furthermore, some small-cells backhaul capacity may fluctuate if wireless backhaul is chosen. With such concerns in mind, a new network selection strategy considering small-cell backhaul capacity is proposed to ensure that users enjoy the best possible user experience especially in terms of connection throughput and fairness. The study compares performance of several common Network Selection Schemes (NSSs) such as WiFi First (WF) and Physical Data Rate (PDR) with the proposed Dynamic Backhaul Capacity Sensitive (DyBaCS) NSS in LTE-WiFi HetNets. The downlink performance of HetNet is evaluated in terms ofaverage throughput per user and fairness among users. The effects of varying WiFi backhaul capacity form the focus for the evaluation. Results show that the DyBaCS scheme generally provides superior performance in terms of fairness and average throughput per user across the range of backhaul capacities considered.

Power-Efficient Resource Allocation in a Heterogeneous Network With Cellular and D2D Capabilities

“…The method assumes, however, a regular channel allocation of IEEE 802.11 channels to relays in different hexagonal cells that may not be realistic because the deployment of Wi-Fi access points is usually highly irregular. In [24], a network selection scheme is considered in a heterogeneous scenario with LTE and Wi-Fi APs that accounts for the backhaul capacity for each AP. The considered scenario assumes APs deployed at specific positions, in contrast to this work, which assumes that the UEs can act as APs and relay the traffic of other UEs towards the LTE network.…”

Performance Evaluation for Wi-Fi Offloading Schemes in LTE Networks

“…This algorithm can end with overloaded Wi-Fi APs with a poor user throughput at high traffic loads. A similar offloading algorithm, usually adapted by mobile operators is presented in [10], which is a Wi-Fi First algorithm (WF). It depends on connecting the users first to WiFi, whenever there is Wi-Fi coverage, and only joins LTE if there is no availability of Wi-Fi.…”

“…All three algorithms do not guarantee a quality of service to connected users to Wi-Fi; they only guarantee the connection. Another offloading scheme presented in [10] is Physical Data Rate Based algorithm (PDR), which is purely based on the PDR provided by different available RATs. This algorithm compares the PDR for Wi-Fi and LTE, and chooses the highest value a user can get.…”

“…Based on equation 9 the total RBs in a subframe with 1 ms duration is equal to 100 RBs , then the maximum throughput for each user will be 3 Mbps in the downlink as shown in equation 10.…”

Backhaul Media Solution for Improvement of Spectrum Efficiency in LTE Networks

“…In most recent evolution of wireless networks, the infrastructure is only IP based packet solution and known as fourth generation cellular system [3] [5]. LTE also belong to latest system of 3GPP family and referred as 3.9G which is pre 4G but beyond 3G.…”