Abstract
In this study, we enhance the almost blank subframe (ABSF) algorithm in a Long Term Evolution (LTE) heterogeneous network (HetNet) by providing a relay function. The ABSF is a technique proposed by the Third Generation Partnership Project to reduce interference in a HetNet. Despite the fact that the ABSF effectively mitigates intercell interference, it has two major disadvantages. First, the ABSF algorithm alters the scheduling policy of macro base stations. Second, it degrades the capacity of users served by femto base stations. Our proposed enhanced algorithm applies a relay function to assist victim macro user equipment (VMUE), and it reduces the side effects caused by the ABSF algorithm. Taking resource allocation and power control into account, the relay function assists VMUE in such a way that interference with other users is minimized. Via simulation results, the proposed algorithm exhibits improvements of 18% and 8% for system throughput and user satisfaction, respectively, in comparison with the conventional ABSF.
Highlights
Recent years have seen a dramatic growth in mobile data traffic
Our proposed enhanced algorithm applies a relay function to assist victim macro user equipment (VMUE), and it reduces the side effects caused by the almost blank subframe (ABSF) algorithm
Taking resource allocation and power control into account, the relay function assists VMUE in such a way that interference with other users is minimized
Summary
Recent years have seen a dramatic growth in mobile data traffic. A Cisco Systems Inc. forecast suggests that the number of activated mobile devices will reach 11.6 billion by 2021 [1]. The increasing data traffic demand motivates the development of the generation of cellular mobile networks with many advanced features. Among these improvements, two features that draw significant concern in the literature are the heterogeneous network (HetNet) and relay functionality [2]. Pico base stations are designed for outdoor use, and cover a range of several hundred meters [5] They are deployed in areas with heavy mobile data traffic, and are open to public users (open-subscriber groups). Taking advantage of a relay function, user equipment (UE) retransmit data of other UE in close proximity, contributing to offloading mobile data from macro base stations, as well as reducing the transmit power needed. Despite the fact that a HetNet provides many advantages, it comes with disadvantages, such as handover management [7,8], load balancing [9], and especially intercell interference
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