Base Station Cooperation with Non-Ideal Backhaul and Non-Full Buffer Traffic

Abstract

Base station cooperation has been shown to significantly mitigate the interference perceived in cellular networks and improve the quality of user experience. On the uplink, joint processing (JP) across antennas within a cluster of base stations yields significant gain, but requires significant backhaul to transport complex I & Q signals. The Network Interference Cancellation Engine (NICE) can yield throughput gains similar to that of JP, but with one to two orders of magnitude less backhaul. While NICE demonstrates significant potential for cellular networks, its performance has been evaluated under somewhat idealistic conditions. For instance, full buffer traffic has generally been assumed, thereby leading to a fully loaded system with strong interference. Bursty traffic may result in a partially loaded system with less interference and impact the gains of interference-mitigating techniques such as NICE. In addition, an ideal backhaul with negligible delay has generally been assumed. However, delays in information exchanges between base stations may decrease the efficacy of base station cooperation. In this paper, the performance of NICE is evaluated under non full buffer traffic and non-ideal backhaul.

Multiuser detection for the uplink of clustered 5G systems with universal frequency reuse

“…, and its elements are associated to the current iteration for MTs already estimated and the previous iteration for the MT currently being detected, as well as the MTs that were not yet detected in the current iteration. It can be shown (as in [20]) that the optimum coefficients F k,p and B k,p are given by F = κ H H e p (5) and and…”

“…This will be achieved mainly by combining massive MIMO (Multi-Input, Multi-Output) techniques, small cells and employing reduced frequency reuse factors (ideally aiming at a universal frequency reuse) [2]. Moreover, one can consider C-RAN (Centralized-Radio Access Network) architectures as one of the optimal approaches to enhance the potential of BS (Base Station) cooperation schemes [3][4][5], which are critical to cope with high interference levels associated to reduced frequency reuse * Corresponding author at: ISCTE -Instituto Universitário de Lisboa, Portugal. E-mail address: casalribeiro.filipe@gmail.com (F.C.…”

Selective cooperative decoding based on a hard‐decision‐aided log‐likelihood ratio approximation

“…The second scheme is referred to as the network interference cancellation engine (NICE), which improves the signal reception quality by cancelling strong out-of-cell interferers. The performance of NICE for a non-ideal backhaul and non-full buffer traffic was also addressed in [14].…”