Hierarchical approach to interference mitigation in multi-cell downlink orthogonal frequency-division multiple-access networks with low feedback

A low-complexity and low-feedback interference mitigation scheme is developed for multi-cell orthogonal frequency-division multiple-access (OFDMA) cellular systems. The problem is formulated as a weighted sum-rate maximisation problem for all users in the network. The centralised solution assuming full feedback of interfering base stations (BSs) from each mobile on each subchannel is prohibitively expensive in terms of computational complexity and feedback overhead. A hierarchical solution is proposed where the BSs solve only localised resource allocation problems, whereas a centralised controller arbitrates the conflicts of interest among different cells. Moreover, the mobiles apply simple threshold rules to reduce the feedback to the BSs. The simulation results show significant savings in the BS-mobile signalling as well as the signalling between the radio network controller (RNC) and the BSs, while maintaining comparable performance to the case of full feedback.

[1]  Xiaodong Wang,et al.  Coordinated Scheduling and Power Allocation in Downlink Multicell OFDMA Networks , 2009, IEEE Transactions on Vehicular Technology.

[2]  Khaled Ben Letaief,et al.  Multiuser adaptive subcarrier-and-bit allocation with adaptive cell selection for OFDM systems , 2004, IEEE Transactions on Wireless Communications.

[3]  Kwang Bok Lee,et al.  Transmit power adaptation for multiuser OFDM systems , 2003, IEEE J. Sel. Areas Commun..

[4]  Leandros Tassiulas,et al.  Cross-Layer Adaptive Techniques for Throughput Enhancement in Wireless OFDM-Based Networks , 2006, IEEE/ACM Transactions on Networking.

[5]  Didem Kivanc-Tureli,et al.  Computationally efficient bandwidth allocation and power control for OFDMA , 2003, IEEE Trans. Wirel. Commun..

[6]  Khaled Ben Letaief,et al.  Multiuser OFDM with adaptive subcarrier, bit, and power allocation , 1999, IEEE J. Sel. Areas Commun..

[7]  Raymond Knopp,et al.  Information capacity and power control in single-cell multiuser communications , 1995, Proceedings IEEE International Conference on Communications ICC '95.

[8]  Jianwei Huang,et al.  Downlink Scheduling and Resource Allocation for OFDM Systems , 2006 .

[9]  Jeffrey G. Andrews,et al.  Adaptive resource allocation in multiuser OFDM systems with proportional rate constraints , 2005, IEEE Transactions on Wireless Communications.

[10]  Murali S. Kodialam,et al.  Characterizing achievable rates in multi-hop wireless networks: the joint routing and scheduling problem , 2003, MobiCom '03.

[11]  John M. Cioffi,et al.  Increase in capacity of multiuser OFDM system using dynamic subchannel allocation , 2000, VTC2000-Spring. 2000 IEEE 51st Vehicular Technology Conference Proceedings (Cat. No.00CH37026).

[12]  Edward W. Knightly,et al.  Opportunistic fair scheduling over multiple wireless channels , 2003, IEEE INFOCOM 2003. Twenty-second Annual Joint Conference of the IEEE Computer and Communications Societies (IEEE Cat. No.03CH37428).

[13]  A. Goldsmith,et al.  Variable-rate variable-power MQAM for fading channels , 1996, Proceedings of Vehicular Technology Conference - VTC.

[14]  John M. Cioffi,et al.  Optimal Resource Allocation for OFDMA Downlink Systems , 2006, 2006 IEEE International Symposium on Information Theory.

[15]  Hui Liu,et al.  Downlink Radio Resource Allocation for Multi-Cell OFDMA System , 2006, IEEE Transactions on Wireless Communications.