The Investigation of Interference Mitigation Techniques in LTE/LTE-A Home eNodeB (HeNB)

Visiting researcher: Prof. Jie Zhang (Sheffield)
Host researcher: Prof. Dongfeng Yuan (SDU) & Dr Mugeng Peng (BUPT)
Duration: 3 months
Status: Ongoing

Biography of the visiting researcher

JIE ZHANG is a Professor of Wireless Communications and Networks at the Department of Computer Science and Technology, University of Bedfordshire (UoB). He joined UoB in 2002 as a Senior Lecturer, becoming Reader and Professor in 2005 and 2006 respectively. From 1997 to 2001, he was a postdoctoral Research Fellow with University College London, Imperial College London and Oxford University. His research interests are focused on radio network planning and optimization (including SON and CoMP). He is the founding director of CWiND, one of the largest and leading research groups in 3G/4G radio network planning and optimization in Europe. Since 2003, he has been awarded some 20 projects worth some £6 million (his share) by the EPSRC, the European Commission (FP6/FP7) and the industry etc. These projects are centred on new radio propagation models, UMTS/HSPA /LTE/WiMAX simulation, planning and optimization, indoor radio network design and femtocells.
Since 2006, he has published over 100 papers in referred journals (e.g., IEEE Trans. on WC/Communications/Antenna and Propagation, IEEE JSAC/Comm. Mag./Network/Comm. Lett./Signal Processing Lett., IET Communications, Wireless Networks, …) and conferences. He is a lead author of the first technical book on femtocell – “Femtocells: Technologies and Deployment” (Wiley, Jan. 2010). He and his students published the first two papers on OFDMA femtocell and a widely cited paper on OFDMA femtocell interference avoidance.
Prof. Zhang is a co-founder of Ranplan Wireless Network Design Ltd., which developed a world-leading in-building wireless network planning and optimisation tool - iBuildNetTM, one of best radio propagation tools in world –RRPS (Ranplan Radio Propagation Simulator), and some ground breaking work in indoor localization/ navigation algorithms and associated hardware and software systems.
Prof. Zhang will take a Chair (Professor) in Wireless Systems at the Dept. of Electronic and Electrical Engineering, Sheffield University ( in Jan. 2011.

Background and Motivation

In cellular networks, it is estimated that 2/3 of calls and over 90% of data services occur indoors. Hence, it is extremely important for cellular operators to provide good indoor coverage, not only for voice, but also, more importantly for high bit rate data services – the key drive of mobile broadband. However, some surveys show that 45% of households and 30% of business experience a poor indoor coverage problem. Due to high penetration loss, macrocells are not good at providing good indoor coverage, in particular for high bit rate data services. In home and SOHO (Small Office Home Office) scenarios, indoor solutions such as picocell, BBU+RRU and Distributed Antenna System (DAS) are not viable business proposition due to high cost. Hence, how to provide good indoor coverage indoors (in particular, for high bit rate services) has become a challenging task for operators. Recently, the development of femtocells provides a good opportunity to address the indoor challenge for home and enterprise.
It is predicted by ABI research that 45 million femtocells will be deployed worldwide by 2014. The deployment of a large number of femtocells (in particular, spectrum-efficient co-channel deployment) will have an impact on the macrocell layer, and gives rise to many interesting and challenging research topics. Among these research topics, interference avoidance and is a very challenging and urgent task. FAPs (Femtocell Access Points) are consumer electronics and must be able to plug and play; hence, they must be able to configure and optimise themselves (e.g. through dynamic channel allocation and power control algorithms) with minimum interventions from users or operators.
In 3GPP ( terminology, femtocell access point (FAP) is called home NodeB (HNB) for WCDMA/HSPA and home eNodeB (HeNB) for LTE (Long Term Evolution) and LTE-Advanced (LTE-A). Both femtocell concept and LTE were first introduced in 3GPP Release 8 and were continued in 3GPP Rel. 9, Rel.10 and beyond.

Research Activities

The main objectives of this staff exchange are as follows:
  1. To develop novel dynamic channel allocation algorithms to reduce interferences in LTE/LTE-A FAPs;
  2. To develop novel dynamic power control algorithms to reduce interferences in LTE/LTE-A FAPs;
  3. To investigate the use of CoMP (Co-ordinated Multi Point) to reduce interference in femto/macrocell scenarios;
  4. To disseminate, exploit the project results with industrial partners and take part in standardisation activities;
  5. To strengthen collaborations between UoB, SDU, and BUPT.


To be updated.
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