TY - JOUR
T1 - Ultra-Reliable and Low-Latency Wireless Communications in the High SNR Regime
T2 - A Cross-Layer Tradeoff
AU - Wang, Yalei
AU - Chen, Wei
AU - Poor, H. Vincent
N1 - Funding Information:
This research was supported in part by the Beijing Natural Science Foundation under grant No. 4191001, the National Natural Science Foundation of China under grant No. 61971264, the National Key R&D Program of China under Grant 2018YFB1801102, and the U.S. National Science Foundation under Grants CCF-0939370, CCF-1513915, and CCF-1908308.
Publisher Copyright:
© 1972-2012 IEEE.
PY - 2022/1/1
Y1 - 2022/1/1
N2 - Ultra-Reliable and Low-Latency Communications (URLLC) has attracted considerable attention because of its potential applications in factory automation, automated driving, and telesurgery anticipated for the era of the sixth-Generation (6G) networks. In URLLC with random channel gains and a hard delay constraint, the scheduling of backlogged queues and finite blocklength coding in the physical layer will make it very challenging to specify its performance limits. In this paper, we focus our attention on the asymptotic cross-layer analysis of URLLC when the Signal-to-Noise Ratio (SNR) is sufficiently high. More specifically, we find that a fundamental tradeoff exists among the service capability, latency, and error probability in the high SNR regime, which is characterized by a gain conservation equation. The main result of this work reveals that the sum of our defined service rate gain, real-time gain, and reliability gain is equal to one under the optimal policy. Numerical simulations are also exploited to validate that the derived gain conservation equation holds even with bounded random arrival.
AB - Ultra-Reliable and Low-Latency Communications (URLLC) has attracted considerable attention because of its potential applications in factory automation, automated driving, and telesurgery anticipated for the era of the sixth-Generation (6G) networks. In URLLC with random channel gains and a hard delay constraint, the scheduling of backlogged queues and finite blocklength coding in the physical layer will make it very challenging to specify its performance limits. In this paper, we focus our attention on the asymptotic cross-layer analysis of URLLC when the Signal-to-Noise Ratio (SNR) is sufficiently high. More specifically, we find that a fundamental tradeoff exists among the service capability, latency, and error probability in the high SNR regime, which is characterized by a gain conservation equation. The main result of this work reveals that the sum of our defined service rate gain, real-time gain, and reliability gain is equal to one under the optimal policy. Numerical simulations are also exploited to validate that the derived gain conservation equation holds even with bounded random arrival.
KW - Ultra-reliable and low-latency communications (URLLC)
KW - asymptotic analysis
KW - cross-layer design
KW - delay violation probability
KW - finite blocklength coding
KW - gain conservation equation
KW - hard delay constraint
KW - high SNR regime
KW - zero delay communications
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U2 - 10.1109/TCOMM.2021.3124946
DO - 10.1109/TCOMM.2021.3124946
M3 - Article
AN - SCOPUS:85118608738
SN - 0090-6778
VL - 70
SP - 149
EP - 162
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
IS - 1
ER -