Can One Achieve Multiuser Diversity in Uplink Multi-Cell Networks?

Abstract

We introduce a distributed opportunistic scheduling (DOS) strategy, based on two pre-determined thresholds, for uplink $K$-cell networks with time-invariant channel coefficients. Each base station (BS) opportunistically selects a mobile station (MS) who has a large signal strength of the desired channel link among a set of MSs generating a sufficiently small interference to other BSs. Then, performance on the achievable throughput scaling law is analyzed. As our main result, it is shown that the achievable sum-rate scales as $K\log (\text{SNR}\log N)$ in a high signal-to-noise ratio (SNR) regime, if the total number of users in a cell, $N$, scales faster than ${\text{SNR}}^{\frac{K-1}{1-\epsilon }}$ for a constant $\epsilon \in (0,1)$. This result indicates that the proposed scheme achieves the multiuser diversity gain as well as the degrees-of-freedom gain even under multi-cell environments. Simulation results show that the DOS provides a better sum-rate throughput over conventional schemes.

11 pages, 3 figures, 2 tables, to appear in IEEE Transactions on Communications

References in corpus (2)

• Opportunistic Interference Mitigation Achieves Optimal Degrees-of-Freedom in Wireless Multi-cell Uplink Networks
• Parallel Opportunistic Routing in Wireless Networks

Cited by in corpus (2)

• Opportunistic Downlink Interference Alignment
• Opportunistic Downlink Interference Alignment for Multi-Cell MIMO Networks