On the Benefits of Multi-hop Communication for Indoor 60 GHz Wireless Networks

TL;DR

This paper demonstrates that multi-hop routing significantly improves reliability and range in indoor 60 GHz mmWave networks by mitigating blockage issues through a specialized hop-by-hop protocol.

Contribution

It introduces a novel multi-path routing protocol with primary and backup next-hops to enhance robustness in mmWave indoor networks.

Findings

Routing improves link reliability under blockage.

Extends communication range in mmWave networks.

Maintains throughput and latency requirements.

Abstract

The spectrum-rich millimeter wave (mmWave) frequencies have the potential to alleviate the spectrum crunch that the wireless and cellular operators are already experiencing. However, compared with traditional wireless communication in the sub-6 GHz bands, due to small wavelengths most objects such as human body, cause significant additional path losses (up to 20dB), which can entirely break the mmWave link. Also, mmwave links suffer from limited range of communication. In this paper, we resort to network layer solutions to demonstrate the benefits of multi-hop routing in mitigating the blockage issue and extending communication range in mmWave band. To this end, we develop a hop-by-hop multi-path routing protocol that finds one primary and one backup next-hop per destination in order to guarantee reliable and robust communication under extreme stress conditions. System-level simulations based on the IEEE802.11ad specifications demonstrate that the proposed routing protocol provides a reliable end-to-end throughput performance, while satisfying the latency requirements.