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Resource allocation for clustered network MIMO OFDMA systems

Jingya Li (Institutionen för signaler och system, Kommunikationssystem) ; Carmen Botella ; Tommy Svensson (Institutionen för signaler och system, Kommunikationssystem)
EURASIP Journal on Wireless Communications and Networking (1687-1499). Vol. 2012 (2012),
[Artikel, refereegranskad vetenskaplig]

In this paper, we address the resource allocation problem for the downlink of a large network MIMO OFDMA system with 3-sector base stations (BSs). The system is statically divided into a number of disjoint clusters of sectors. A two-step resource allocation scheme is proposed involving the inter-cluster and the intra-cluster levels. As a first step or inter-cluster level, two cooperative frequency reuse approaches are designed to mitigate the inter-cluster interference. A user partition method is proposed to divide the users of each cluster into cluster-edge and cluster-center users. To balance the cell-edge and the cell-average performance, a fairness jug function is introduced to determine the frequency partition of the cooperative frequency reuse approaches. Then, as a second step or intra-cluster level, a utility-based joint scheduling and power allocation algorithm is proposed for each cluster, to maximize the sum utility of all users in the cluster under per-sector power constraints. Zero-forcing joint transmission is used across multiple sectors within the same cluster. Simulation results show that the proposed scheme can efficiently reduce the inter-cluster interference and provide considerable performance improvement in terms of both the cell-edge and cell-average user data rate. The proposed two-step resource allocation scheme can be implemented independently in each cluster without inter-cluster information exchange, which is an attractive property for practical systems, since it reduces both the network signaling overhead and the computational complexity.

Nyckelord: OFDMA, network MIMO, frequency reuse, resource allocation, interference coordination



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Denna post skapades 2012-06-11. Senast ändrad 2015-03-30.
CPL Pubid: 158779

 

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Projekt

Denna publikation är ett resultat av följande projekt:


Advanced Radio Interface Technologies for 4G Systems (ARTIST4G) (EC/FP7/247223)