Journal
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
Volume 39, Issue 6, Pages 1833-1853Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSAC.2021.3071852
Keywords
Handover; Reliability; Cellular networks; 5G mobile communication; Quality of service; Throughput; Protocols; Handover; reliability; low latency; millimeter wave; mmWave; terahertz; THz; blockages; multi-connectivity; quality of service; URLLC
Funding
- NYU Wireless, an Ernst Weber Fellowship
- NY State Center for Advanced Technology in Telecommunications (CATT)
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Wireless communication in the THz frequency bands offers abundant bandwidth and connectivity benefits, but inefficiencies in handover procedures and poor propagation characteristics may pose challenges in achieving the required reliability and low latency. Enhancements in multi-connectivity and handover efficiency are essential for reducing interruptions in data plane and ensuring high reliability in blockage driven networks.
Wireless communication over terahertz (THz) frequency bands is envisioned as the key enabler of many applications and services offered in 6G networks. The abundantly available bandwidth in THz frequencies can satisfy the ultra-high user throughput requirements and accommodate a massive number of connected devices. However, poor propagation characteristics, shadowing, and blockages may result in sudden outages and necessitate frequent handovers. Therefore, an inefficient handover procedure will impose severe challenges in meeting the ultra-high reliability and low latency requirements of emerging applications. In blockage driven mmWave and THz networks, a higher multi-connectivity degree and efficient handover procedures are needed to reduce the data plane interruptions and to achieve high reliability. We present an analytical model to study the impact of handover procedures and multi-connectivity degree on the latency and reliability of blockage driven wireless networks. From the network protocol design perspective, our study offers a quick and accurate way to envisage how network architecture and protocols should evolve in terms of multi-connectivity degrees and handover procedural efficiency. Our results suggest that, for THz systems, coverage range should be increased even if it comes at the cost of increased initial access and base station discovery times.
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