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Enabling Technologies for Ultra-Reliable and Low Latency Communications: From PHY and MAC Layer Perspectives

Gordon J. Sutton, Jie Zeng, Ren Ping Liu, Wei Ni, Diep N. Nguyen, Beeshanga A. Jayawickrama, Xiaojing Huang, Mehran Abolhasan, Zhang Zhang, Eryk Dutkiewicz, Tiejun Lv
2019 IEEE Communications Surveys and Tutorials  
We identify that enabling long-term evolution (LTE) to coexist in the unlicensed spectrum is also a potential enabler of URLLC in the unlicensed band, and provide numerical evaluations.  ...  The paper evaluates the relevant PHY and MAC techniques for their ability to improve the reliability and reduce the latency.  ...  However, in a TDD system, UL CSI could be acquired from the DL CSI measurement with reciprocity.  ... 
doi:10.1109/comst.2019.2897800 fatcat:jgaahgi27rev3ieyrisn2yvh5m

Sixty Years of Coherent Versus Non-coherent Tradeoffs and the Road from 5G to Wireless Futures

Chao Xu, Naoki Ishikawa, Rakshith Rajashekar, Shinya Sugiura, Robert G. Maunder, Zhaocheng Wang, Lie-Liang Yang, Lajos Hanzo.
2019 IEEE Access  
a substantial amount of signalling overhead that consumes both power and the valuable spectral resources.  ...  Sixty years of coherent versus non-coherent tradeoff as well as the twenty years of coherent versus non-coherent tradeoff in Multiple-Input Multiple-Output (MIMO) systems are surveyed.  ...  More explicitly, the TDD separates the UL and DL in the time domain, which requires a guard interval during which the UL/DL switching transients subside.  ... 
doi:10.1109/access.2019.2957706 fatcat:ve6pihtjqzfbxhswohzpxjjjui

Towards Massive Machine Type Communications in Ultra-Dense Cellular IoT Networks: Current Issues and Machine Learning-Assisted Solutions

Shree Krishna Sharma, Xianbin Wang
2019 IEEE Communications Surveys and Tutorials  
Next, we provide a detailed overview of the existing and emerging solutions towards addressing RAN congestion problem, and then identify potential advantages, challenges and use cases for the applications  ...  Subsequently, we present a framework for the performance analysis of transmission scheduling with the QoS support along with the issues involved in short data packet transmission.  ...  Furthermore, the prediction of PER with good accuracy becomes difficult in practice by using the conventional signal processing tools.  ... 
doi:10.1109/comst.2019.2916177 fatcat:vj7pau7mi5ch5ne6akgvrrtsla