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Multiuser scheduling in high speed downlink packet access

Multiuser scheduling in high speed downlink packet access

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Published

Multiuser scheduling is an important aspect in the performance optimisation of a wireless network as it allows multiple users to efficiently access a shared channel by exploiting multiuser diversity. For example, the 3GPP cellular standard supports multiuser scheduling in the high speed downlink packet access (HSDPA) feature. To perform efficient scheduling, channel state information (CSI) for users is required, and is obtained via their respective feedback channels. Multiuser scheduling is studied assuming the availability of perfect CSI, which would require a high bandwidth overhead. A more realistic imperfect CSI feedback in the form of a finite set of channel quality indicator values is assumed, as specified in the HSDPA standard. A global optimal approach and a simulated annealing (CSA) approach are used to solve the optimisation problem. Simulation results suggest that the performances of the two approaches are very close even though the complexity of the simulated annealing (SA) approach is much lower. The performance of a simple greedy approach is found to be significantly worse.

Inspec keywords: diversity reception; 3G mobile communication; scheduling; simulated annealing; multiuser channels; cellular radio

Other keywords: simulated annealing; shared channel; multiuser scheduling; multiple user; feedback channel; channel quality indicator value; 3GPP cellular standard; wireless network performance optimisation; channel state information; high speed downlink packet access; multiuser diversity

Subjects: Optimisation techniques; Mobile radio systems

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