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      Effective Capacity for Renewal Service Processes with Applications to HARQ Systems

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          Abstract

          Considering the widespread use of effective capacity in cross-layer design and the extensive existence of renewal service processes in communication networks, this paper thoroughly investigates the effective capacity for renewal processes. Based on Z-transform, we derive exact analytical expressions for the effective capacity at a given quality of service (QoS) exponent for both the renewal processes with constant reward and with variable rewards. Unlike prior literature that the effective capacity is approximated with no many insightful discussions, our expression is simple and reveals further meaningful results, such as the monotonicity and bounds of effective capacity. The analytical results are then applied to evaluate the cross-layer throughput for diverse hybrid automatic repeat request (HARQ) systems, including fixed-rate HARQ (FR-HARQ, e.g., Type I HARQ, HARQ with chase combining (HARQ-CC) and HARQ with incremental redundancy (HARQ-IR)), variable-rate HARQ (VR-HARQ) and cross-packet HARQ (XP-HARQ). Numerical results corroborate the analytical ones and prove the superiority of our proposed approach. Furthermore, targeting at maximizing the effective capacity via the optimal rate selection, it is revealed that VR-HARQ and XP-HARQ attain almost the same performance, and both of them perform better than FR-HARQ.

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          Most cited references15

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          Effective capacity: A wireless link model for support of quality of service

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            The throughput of hybrid-ARQ protocols for the Gaussian collision channel

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              Cross-Layer Combining of Adaptive Modulation and Coding With Truncated ARQ Over Wireless Links

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                Author and article information

                Journal
                16 December 2018
                Article
                1812.06470
                80a6634e-39c8-4682-aad1-c053bd61ab4d

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

                History
                Custom metadata
                7 figures to be submitted to IEEE Transactions on Communications
                cs.IT math.IT

                Numerical methods,Information systems & theory
                Numerical methods, Information systems & theory

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