Delay-Sensitive Communications Over IR-HARQ: Modulation, Coding Latency, and Reliability

With the growing popularity of delay-sensitive applications (e.g., real-time conversational video, online gaming, and augmented reality) and future trends toward ultra-reliable low-latency communications such as the tactile Internet, performance analysis of wireless systems under the finite code blo...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 2019-04, Vol.37 (4), p.749-764
Main Authors: Sahin, Cenk, Liu, Lingjia, Perrins, Erik, Ma, Liangping
Format: Article
Language:English
Subjects:
Algorithms
Augmented reality
Automatic repeat request
Coding
Delay
delay-sensitive
delay-violation probability
Encoding
Fading
Fading channels
finite blocklength coding
IR-HARQ
Markov chains
Markov processes
Modulation
Performance evaluation
Pulse amplitude modulation
Random noise
Redundancy
Reliability
Throughput
Transition probabilities
URLLC
Wireless communication
Wireless communications
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Summary:With the growing popularity of delay-sensitive applications (e.g., real-time conversational video, online gaming, and augmented reality) and future trends toward ultra-reliable low-latency communications such as the tactile Internet, performance analysis of wireless systems under the finite code blocklength constraint becomes extremely important. In this paper, we investigate the maximum achievable throughput of incremental redundancy-hybrid automatic repeat request (IR-HARQ) over the (correlated) Rayleigh fading channel under finite blocklength and delay-violation probability constraints as a function of the modulation scheme. The maximum number of HARQ rounds together with the transport block size specifies the underlying coding latency of the IR-HARQ scheme. A framework, namely the HARQ Markov model (HARQ-MM), is introduced to track the throughput and the probability of error of IR-HARQ over the Rayleigh fading channel as a function of the modulation scheme. The dispersion of parallel additive white Gaussian noise channels with finite input alphabets (e.g., pulse amplitude modulation) is analytically characterized. It is used to identify the state transition probabilities of the underlying HARQ-MM. An algorithm is developed to efficiently compute the steady-state distribution of the HARQ-MM. Extensive performance evaluation is conducted, which shows a good match between the throughput performance characterized by the theoretical framework and that achieved by the practical channel codes.
ISSN:0733-8716
1558-0008
DOI:10.1109/JSAC.2019.2898784