Uplink Multicell Processing with Limited Backhaul via Per-Base-Station Successive Interference Cancellation

TL;DR

This paper proposes a practical uplink multicell processing scheme using per-base-station compress-and-forward with successive interference cancellation, analyzing the impact of limited backhaul capacity and optimal rate allocation.

Contribution

It introduces a suboptimal yet computable rate region scheme using Wyner-Ziv coding and SIC, and characterizes backhaul capacity scaling and optimal allocation strategies.

Findings

Backhaul capacity must scale logarithmically with SINR for near-optimal rates.

The proposed scheme simplifies rate region computation compared to joint decoding.

Optimal backhaul allocation also scales with the log of SINR at each base-station.

Abstract

This paper studies an uplink multicell joint processing model in which the base-stations are connected to a centralized processing server via rate-limited digital backhaul links. Unlike previous studies where the centralized processor jointly decodes all the source messages from all base-stations, this paper proposes a suboptimal achievability scheme in which the Wyner-Ziv compress-and-forward relaying technique is employed on a per-base-station basis, but successive interference cancellation (SIC) is used at the central processor to mitigate multicell interference. This results in an achievable rate region that is easily computable, in contrast to the joint processing schemes in which the rate regions can only be characterized by exponential number of rate constraints. Under the per-base-station SIC framework, this paper further studies the impact of the limited-capacity backhaul links on the achievable rates and establishes that in order to achieve to within constant number of bits to the maximal SIC rate with infinite-capacity backhaul, the backhaul capacity must scale logarithmically with the signal-to-interference-and-noise ratio (SINR) at each base-station. Finally, this paper studies the optimal backhaul rate allocation problem for an uplink multicell joint processing model with a total backhaul capacity constraint. The analysis reveals that the optimal strategy that maximizes the overall sum rate should also scale with the log of the SINR at each base-station.