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The 6th generation of wireless communication (6G) is envisioned to give riseto various technologies for improving the end-to-end communication performance,where the communication is envisioned to utilize wireless signals in themillimeter wave (mmWave) frequencies and above. Among others, thesetechnologies comprise Intelligent Reflective Surfaces (IRSs) and Mobile Relays(MRs), whose envisaged roles include mitigating the negative effects ofNon-Line-of-Sight (NLoS) connectivity, in particular at mmWave and higherfrequencies. The core idea behind these technologies is to use cooperativenetworking where the source sends a signal to a repeater, in this case the IRSor the MR, which is upon reception forwarded to the destination. When comparingthe two technologies, it is important to realize that the IRSs are primarilyenvisioned to be static entities attached to various objects in the environmentsuch as walls and furniture. In contrast, the MRs will feature a higher degreeof freedom, as they will be able to position themselves seamlessly in theenvironment. Based on the above assumptions, we derive an approach fordetermining the optimal position of the IRS and MR in indoor environments,i.e., the one that maximizes the end-to-end link quality between the source andthe destination. We follow by capturing the communication quality indicatorsfor both IRS- and MR-supported NLoS avoidance in indoor mmWave communication ina number of scenarios. Our results show that, from the end-to-end link qualityperspective, the MRs generally outperform the IRSs, suggesting theirutilization potential for throughput-optimized NLoS avoidance scenarios.

Intelligent Reflective Surface vs. Mobile Relay-supported NLoS Avoidance in Indoor mmWave Networks