Bernard Hunt

Bernard Hunt


5G Programme Manager
+44 (0)1483 686178
15 CII 01

Academic and research departments

Institute for Communication Systems.

Biography

My publications

Publications

Kosta C, Hunt B, Quddus AU, Tafazolli R (2012) On Interference Avoidance through Inter-Cell Interference Coordination (ICIC) Based on OFDMA Mobile Systems, IEEE Communications Surveys and Tutorials
The widely accepted OFDMA air interface technology has recently been adopted in most mobile standards by the wireless industry. However, similar to other frequency-time multiplexed systems, their performance is limited by inter-cell interference. To address this performance degradation, interference mitigation can be employed to maximize the potential capacity of such interference-limited systems. This paper surveys key issues in mitigating interference and gives an overview of the recent developments of a promising mitigation technique, namely, interference avoidance through inter-cell interference coordination (ICIC). By using optimization theory, an ICIC problem is formulated in a multi-cell OFDMA-based system and some research directions in simplifying the problem and associated challenges are given. Furthermore, we present the main trends of interference avoidance techniques that can be incorporated in the main ICIC formulation. Although this paper focuses on 3GPP LTE/LTE-A mobile networks in the downlink, a similar framework can be applied for any typical multi-cellular environment based on OFDMA technology. Some promising future directions are identified and, finally, the state-of-the-art interference avoidance techniques are compared under LTE-system parameters.
Kosta C, Hunt B, Ui Quddus A, Tafazolli R (2013) Distributed energy-efficient inter-cell interference coordination (ICIC) in multi-cell HetNets, IEEE Vehicular Technology Conference
We present a distributed energy-efficient Inter-Cell Interference Coordination (ICIC) scheme for multi-cell HetNets (Heterogeneous Networks) in the downlink. This novel scheme aims to maximize the user fairness performance of the overall system as well as minimizing the total average transmit power at the base station side. We consider a realistic power model to characterize the power consumed (including circuit and transmitted power) at the base station side. We define an energy efficient performance metric in bits/Joule and the user fairness as the 5th percentile of the average user throughput. The proposed scheme is divided into the following three stages: dominant interferences classification, inter-cell radio resource allocation and intra-cell power control. The inter-cell radio resource allocation is formulated as a multidimensional knapsack problem. In order to satisfy the complexity requirements associated with multi-cell networks, we simplify, relax and decompose the original problem into a main master problem and multiple sub-problems. Our simulation results show the proposed scheme significantly increases both the user fairness and the energy efficiency (EE) of the overall network. © 2013 IEEE.
In this paper we present a novel distributed Inter-Cell Interference Coordination (ICIC) scheme for interference-limited heterogeneous cellular networks (HetNet). We reformulate our problem in such a way that it can be decomposed into a number of small sub-problems, which can be solved independently through an iterative subgradient method. The proposed dual decomposition method can also address problems with binary-valued variables. The proposed algorithm is compared with some reference schemes in terms of cell-edge and total cell throughput.
Kosta C, Hunt B, Quddus AU, Tafazolli R (2013) A distributed method of inter-cell interference coordination (ICIC) based on dual decomposition for interference-limited cellular networks, IEEE Communications Letters 17 (6) pp. 1144-1147
In this paper we present a novel distributed Inter-Cell Interference Coordination (ICIC) scheme for interference-limited heterogeneous cellular networks (HetNet). We reformulate our problem in such a way that it can be decomposed into a number of small sub-problems, which can be solved independently through an iterative subgradient method. The proposed dual decomposition method can also address problems with binary-valued variables. The proposed algorithm is compared with some reference schemes in terms of cell-edge and total cell throughput. © 1997-2012 IEEE.
Kosta C, Hunt B, Quddus AU, Tafazolli R (2013) On interference avoidance through inter-cell interference coordination (ICIC) based on OFDMA mobile systems, IEEE Communications Surveys and Tutorials 15 (3) pp. 973-995
The widely accepted OFDMA air interface technology has recently been adopted in most mobile standards by the wireless industry. However, similar to other frequency-time multiplexed systems, their performance is limited by inter-cell interference. To address this performance degradation, interference mitigation can be employed to maximize the potential capacity of such interference-limited systems. This paper surveys key issues in mitigating interference and gives an overview of the recent developments of a promising mitigation technique, namely, interference avoidance through inter-cell interference coordination (ICIC). By using optimization theory, an ICIC problem is formulated in a multi-cell OFDMA-based system and some research directions in simplifying the problem and associated challenges are given. Furthermore, we present the main trends of interference avoidance techniques that can be incorporated in the main ICIC formulation. Although this paper focuses on 3GPP LTE/LTE-A mobile networks in the downlink, a similar framework can be applied for any typical multi-cellular environment based on OFDMA technology. Some promising future directions are identified and, finally, the state-of-the-art interference avoidance techniques are compared under LTE-system parameters. © 2013 IEEE.
Vural S, Navaratnam P, Wang N, Tafazolli R (2013) Asynchronous Clustering of Multihop Wireless Sensor Networks, ACM Transactions on Sensor Networks
Quddus AU, Guo T, Shariat M, Hunt B, Imran A, Ko Y, Tafazolli R (2010) Next Generation Femtocells: An Enabler for High Efficiency Multimedia Transmission, IEEE Comsoc MMTC E-Letters 5 (5) pp. 27-31 IEEE
The first generation of femtocells is evolving to the next generation with many more capabilities in terms of better utilisation of radio resources and support of high data rates. It is thus logical to conjecture that with these abilities and their inherent suitability for home environment, they stand out as an ideal enabler for delivery of high efficiency multimedia services. This paper presents a comprehensive vision towards this objective and extends the concept of femtocells from indoor to outdoor environments, and strongly couples femtocells to emergency and safety services. It also presents and identifies relevant issues and challenges that have to be overcome in realization of this vision.
Kosta C, Hunt B, Quddus AU, Tafazolli R (2012) A low-complexity distributed inter-cell interference coordination (ICIC) scheme for emerging multi-cell HetNets, IEEE Vehicular Technology Conference
In this paper, we propose a low-complexity distributed Inter-Cell Interference Coordination (ICIC) for emerging multi-cell HetNets (Heterogeneous Networks). The proposed scheme is quickly solved using linear programming tools and aims to maximize both the critical and the overall performance of the multi-cell system. Additionally, a utility measure is used to provide a varying level of user fairness to satisfy the most demanding network providers. Simulation results confirm the low-complexity of the proposed algorithm and its increased effectiveness over a number of state-of-art interference avoidance schemes. © 2012 IEEE.