Low-Latency Heterogeneous Networks with Millimeter-Wave Communications

TL;DR

This paper reviews the challenges of end-to-end latency in 5G heterogeneous networks using millimeter-wave communications and proposes an adaptive cooperative networking strategy to reduce latency, highlighting future research challenges.

Contribution

It introduces an adaptive low-latency strategy using cooperative networking for mm-wave HetNets and evaluates its effectiveness in reducing end-to-end latency.

Findings

Cooperative networking significantly reduces latency.

Proper strategy implementation is crucial for latency improvement.

Identifies future challenges in low-latency mm-wave HetNets.

Abstract

Heterogeneous network (HetNet) is a key enabler to largely boost network coverage and capacity in the forthcoming fifth-generation (5G) and beyond. To support the explosively growing mobile data volumes, wireless communications with millimeter-wave (mm-wave) radios have attracted massive attention, which is widely considered as a promising candidate in 5G HetNets. In this article, we give an overview on the end-to-end latency of HetNets with mm-wave communications. In general, it is rather challenging for formulating and optimizing the delay problem with buffers in mm-wave communications, since conventional graph-based network optimization techniques are not applicable when queues are considered. Toward this end, we develop an adaptive low-latency strategy, which uses cooperative networking to reduce the end-to-end latency. Then, we evaluate the performance of the introduced strategy. Results reveal the importance of proper cooperative networking in reducing the end-to-end latency. In addition, we have identified several challenges in future research for low-latency mm-wave HetNets.