Alapfogalmak
The core message of this paper is to characterize the fundamental tradeoff between reliability, latency, and throughput in low-latency communications systems with finite-blocklength coding.
Kivonat
The paper investigates the reliability-latency-rate tradeoff in low-latency communications with finite-blocklength coding (FBC). The key highlights and insights are:
The authors derive the high-SNR slope of effective capacity (EC) in the FBL regime for SISO systems in AWGN and Nakagami-m fading channels. This high-SNR slope represents the service-rate gain.
The authors define the reliability gain as the decreasing rate of error probability with increasing SNR in the high-SNR regime. They link the reliability gain to the high-SNR slope of EC.
The authors propose the revised gain-conservation equations that characterize the tradeoff between the service-rate gain, reliability gain, and real-time gain (decreasing rate of delay-violation probability) in the high-SNR regime.
For the AWGN channel, the authors further discuss the tradeoff between error probability and queue-length-violation probability.
The authors propose a Laplace's-method-based EC approximation approach to derive the closed-form expression of EC in the FBL regime, which can facilitate the analysis and optimization of low-latency systems.