Variable-Rate Incremental-Redundancy HARQ for Finite Blocklengths
Incremental redundancy (IR) hybrid automatic repeat request (HARQ) is a staple component of modern wireless systems, instrumental for efficient and reliable low-latency communication. To further improve the performance, the blocklengths—and therefore the incremental rates—of th...
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IEEE
2025-01-01
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| Series: | IEEE Open Journal of the Communications Society |
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| Online Access: | https://ieeexplore.ieee.org/document/10883043/ |
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| author | Yu Fu Angel Lozano Hongwen Yang |
| author_facet | Yu Fu Angel Lozano Hongwen Yang |
| author_sort | Yu Fu |
| collection | DOAJ |
| description | Incremental redundancy (IR) hybrid automatic repeat request (HARQ) is a staple component of modern wireless systems, instrumental for efficient and reliable low-latency communication. To further improve the performance, the blocklengths—and therefore the incremental rates—of the various transmissions can be released from being fixed. This paper optimizes these variable blocklengths in truncated IR-HARQ, with the goal of maximizing the overall throughput at any desired operating point (meaning any combination of signal-to-noise ratio and target error rate). The optimization relies on a finite-blocklength information-theoretical analysis, whereby the block error rate emerges as a function of the channel capacity and the channel dispersion. Numerical results confirm that the optimized variable-rate IR-HARQ significantly outperforms its fixed-rate counterpart, both with ideal codes and with a 5G commercial code. Additionally, a heuristic scheme that mimics the behavior of the optimized solution, but is simpler to implement, is set forth and shown to essentially attain the same performance. |
| format | Article |
| id | doaj-art-32e4a6f2e10f4134b6c4dd714f01965f |
| institution | DOAJ |
| issn | 2644-125X |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Open Journal of the Communications Society |
| spelling | doaj-art-32e4a6f2e10f4134b6c4dd714f01965f2025-08-20T03:18:13ZengIEEEIEEE Open Journal of the Communications Society2644-125X2025-01-0161413142210.1109/OJCOMS.2025.354123810883043Variable-Rate Incremental-Redundancy HARQ for Finite BlocklengthsYu Fu0https://orcid.org/0000-0001-8767-6035Angel Lozano1https://orcid.org/0000-0003-3790-0494Hongwen Yang2https://orcid.org/0000-0002-7541-8474School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, ChinaDepartment of Engineering, Universitat Pompeu Fabra, Barcelona, SpainSchool of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, ChinaIncremental redundancy (IR) hybrid automatic repeat request (HARQ) is a staple component of modern wireless systems, instrumental for efficient and reliable low-latency communication. To further improve the performance, the blocklengths—and therefore the incremental rates—of the various transmissions can be released from being fixed. This paper optimizes these variable blocklengths in truncated IR-HARQ, with the goal of maximizing the overall throughput at any desired operating point (meaning any combination of signal-to-noise ratio and target error rate). The optimization relies on a finite-blocklength information-theoretical analysis, whereby the block error rate emerges as a function of the channel capacity and the channel dispersion. Numerical results confirm that the optimized variable-rate IR-HARQ significantly outperforms its fixed-rate counterpart, both with ideal codes and with a 5G commercial code. Additionally, a heuristic scheme that mimics the behavior of the optimized solution, but is simpler to implement, is set forth and shown to essentially attain the same performance.https://ieeexplore.ieee.org/document/10883043/Blocklength allocationfinite blocklengthhybrid automatic repeat requestincremental redundancythroughput |
| spellingShingle | Yu Fu Angel Lozano Hongwen Yang Variable-Rate Incremental-Redundancy HARQ for Finite Blocklengths IEEE Open Journal of the Communications Society Blocklength allocation finite blocklength hybrid automatic repeat request incremental redundancy throughput |
| title | Variable-Rate Incremental-Redundancy HARQ for Finite Blocklengths |
| title_full | Variable-Rate Incremental-Redundancy HARQ for Finite Blocklengths |
| title_fullStr | Variable-Rate Incremental-Redundancy HARQ for Finite Blocklengths |
| title_full_unstemmed | Variable-Rate Incremental-Redundancy HARQ for Finite Blocklengths |
| title_short | Variable-Rate Incremental-Redundancy HARQ for Finite Blocklengths |
| title_sort | variable rate incremental redundancy harq for finite blocklengths |
| topic | Blocklength allocation finite blocklength hybrid automatic repeat request incremental redundancy throughput |
| url | https://ieeexplore.ieee.org/document/10883043/ |
| work_keys_str_mv | AT yufu variablerateincrementalredundancyharqforfiniteblocklengths AT angellozano variablerateincrementalredundancyharqforfiniteblocklengths AT hongwenyang variablerateincrementalredundancyharqforfiniteblocklengths |