Enhancing cell-edge performance: a downlink dynamic interference avoidance scheme with inter-cell coordination

Abstract

Abstract-Interference management has been a key concept for designing future high data-rate wireless systems that are required to employ dense reuse of spectrum. Static or semistatic interference coordination based schemes provide enhanced cell-edge performance but with severe penalty to the overall cell throughput. Furthermore, static resource planning makes these schemes unsuitable for applications in which frequency planning is difficult, such as femtocell networks. In this paper, we present a novel dynamic interference avoidance scheme that makes use of inter-cell coordination in order to prevent excessive inter-cell interference, especially for cell or sector edge users that are most affected by inter-cell interference, with minimal or no impact on the network throughput. The proposed scheme is comprised of a two-level algorithm -one at the base station level and the other at a central controller to which a group of neighboring base stations are connected. Simulation results show that the proposed scheme outperforms the reference schemes, in which either coordination is not employed (reuse of 1) or employed in a static manner (reuse of 3 and fractional frequency reuse), in terms of cell edge throughput with a minimal impact on the network throughput and with some increase in complexity.

Enhanced Quality of Service of Cell-Edge User by Extending Modified Largest Weighted Delay First Algorithm in LTE Networks

“…They proposed three RB allocation techniques, namely, pure random allocation, compact random allocation and allocation with memory. The authors in [18] present an interference avoidance method to prevent strong inter-cell interference for the cell-edge user. Their proposed method consists of a two-tier algorithm-the first one at the eNB level and the second one at a central controller.…”

Bilayer Beams and Relay Sharing based OFDMA Cellular Architecture

“…Soft Frequency Reuse (SFR) employs zone-based reuse factors in the cell center and the cell edge areas [10]. Center areas of all cells use the same band with lower transmit power, achieving an efficient use of spectrum resource.…”

Resource management in OFDMA heterogeneous network

“…Results show that the FFR scheme can provide extra capacity, while it slightly penalizes the users at the cell edge. In [18], according to the CSI (the interference received by the neighboring eNBs is included) sent by each MT to the serving eNB, the eNB clusters the interfering eNBs and creates a wish list of resource blocks to be restricted in its neighboring cells. Simulations show that the proposed scheme outperforms the reference schemes in terms of throughput at the cell boundaries, while it lacks algorithmic simplicity.…”