RELAY BEAMFORMING TO MITIGATE INTER-RELAY INTERFERENCE IN MULTI-CELL SCENARIO

In relay assisted Long Term Evolution-Advanced (LTE-A) network, enhanced Node B (eNB) autonomously selects different backhaul sub-frame configurations to adopt traffic variations, which might cause inter-relay interference (IRI) between relay nodes (RNs) in adjacent cells.  IRI can happen due to asynchronous transmission between adjacent cells, which results in IRI from the access link to the backhaul link of adjacent relay in the downlink direction and vice versa. This causes severe loss in system capacity and introduces high outage probability.  In this article, we consider the IRI problem in a multi-cell relaying system.  Previous studies consider the beamforming design for cooperative relay network as a single-cell problem, without taking into account the occurrence of IRI.  However, the performance of the RN assisted network is limited by the IRI from adjacent RN.  A hybrid zero-forcing and singular value decomposition (ZF-SVD) beamforming technique is proposed to eliminate the IRI. Simulation results show that the proposed scheme out-performs the comparable scheme in both the ergodic capacity and outage probability.

[1]  Bora Kim,et al.  Cell Range Expansion and Time Partitioning for Enhanced Inter-cell Interference Coordination in Heterogeneous Network , 2014, 2014 47th Hawaii International Conference on System Sciences.

[2]  Simone Redana,et al.  A divide-and-conquer approach to mitigate relay-to-relay interference , 2011, 2011 IEEE 22nd International Symposium on Personal, Indoor and Mobile Radio Communications.

[3]  Marceau Coupechoux,et al.  Optimal Relay Placement in Cellular Networks , 2014, IEEE Transactions on Wireless Communications.

[4]  Lajos Hanzo,et al.  3G, HSPA and FDD versus TDD Networking: Smart Antennas and Adaptive Modulation , 2008 .

[5]  Oliver Stanze,et al.  Scheduling strategies for HetNets using eICIC , 2012, 2012 IEEE International Conference on Communications (ICC).

[6]  Dong Ku Kim,et al.  A Study on Performance of MIMO-Relaying Scheme in Heterogeneous Networks , 2009, 2009 Fourth International Conference on Computer Sciences and Convergence Information Technology.

[7]  Simone Redana,et al.  Impact of power control optimization on the system performance of relay based LTE-Advanced heterogeneous networks , 2011, Journal of Communications and Networks.

[8]  Asmaa Abdallah,et al.  Relaying Techniques for LTE-Advanced , 2015 .

[9]  Ling Qiu,et al.  The Effect of Channel Estimation Error in Multiuser Downlink MIMO Relay Channels , 2010, 2010 IEEE Wireless Communication and Networking Conference.

[10]  Simone Redana,et al.  Flexible Backhaul Resource Sharing and Uplink Power Control Optimization in LTE-Advanced Relay Networks , 2011, 2011 IEEE Vehicular Technology Conference (VTC Fall).

[11]  Raymond Knopp,et al.  Multi-Pair Two-Way Relay Channel with Multiple Antenna Relay Station , 2010, 2010 IEEE International Conference on Communications.

[12]  Florian Roemer,et al.  Beamforming design for multi-user two-way relaying with MIMO amplify and forward relays , 2011, 2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP).

[13]  Yoan Shin,et al.  Inter-cell interference management using multi-cell Shared Relay Nodes in 3GPP LTE-Advanced networks , 2013, 2013 IEEE Wireless Communications and Networking Conference (WCNC).

[14]  H. Wei,et al.  Performance Analysis of a Dual-Hop Cooperative Relay Network with Co-Channel Interference , 2014 .

[15]  Hyoung-Kyu Song,et al.  Adaptive cooperative communications with multiple antennas , 2013 .

[16]  Oriol Sallent,et al.  Extending the LTE\/LTE-A Business Case: Mission- and Business-Critical Mobile Broadband Communications , 2014, IEEE Vehicular Technology Magazine.

[17]  Norsheila Fisal,et al.  Stochastic geometry based dynamic fractional frequency reuse for OFDMA systems , 2014 .

[18]  Sonia Aïssa,et al.  Leakage Based Precoding for Multi-User MIMO-OFDM Systems , 2011, IEEE Transactions on Wireless Communications.

[19]  Wenbo Wang,et al.  A Network Coded Interference Coordination Scheme in Cellular Relay Systems , 2012, IEEE Communications Letters.

[20]  Romano Fantacci,et al.  Beamforming for small cell deployment in LTE-advanced and beyond , 2014, IEEE Wireless Communications.