ePec-LDPC HARQ: An LDPC HARQ Scheme with Targeted Retransmission

Yumei WANG; Jiawei LIANG; Hao WANG; Eiji OKI; Lin ZHANG

doi:10.1587/transcom.2016EBP3004

ePec-LDPC HARQ: An LDPC HARQ Scheme with Targeted Retransmission

Yumei WANG, Jiawei LIANG, Hao WANG, Eiji OKI, Lin ZHANG

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In 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) systems, when HARQ (Hybrid Automatic Repeat request) retransmission is invoked, the data at the transmitter are retransmitted randomly or sequentially regardless of their relationship to the wrongly decoded data. Such practice is inefficient since precious transmission resources will be spent to retransmit data that may be of no use in error correction at the receiver. This paper proposes an incremental redundancy HARQ scheme based on Error Position Estimating Coding (ePec) and LDPC (Low Density Parity Check Code) channel coding, which is called ePec-LDPC HARQ. The proposal is able to feedback the wrongly decoded code blocks within a specific MAC (Media Access Control) PDU (Protocol Data Unit) from the receiver. The transmitter gets the feedback information and then performs targeted retransmission. That is, only the data related to the wrongly decoded code blocks are retransmitted, which can improve the retransmission efficiency and thus reduce the retransmission overload. An enhanced incremental redundancy LDPC coding approach, called EIR-LDPC, together with a physical layer framing method, is developed to implement ePec-LDPC HARQ. Performance evaluations show that ePec-LDPC HARQ reduces the overall transmission resources by 15% compared to a conventional LDPC HARQ scheme. Moreover, the average retransmission times of each MAC PDU and the transmission delay are also reduced considerably.

Publication: IEICE TRANSACTIONS on Communications Vol.E99-B No.10 pp.2168-2178

Publication Date: 2016/10/01

Publicized: 2016/04/12

Online ISSN: 1745-1345

DOI: 10.1587/transcom.2016EBP3004

Type of Manuscript: PAPER

Category: Fundamental Theories for Communications

Authors

Yumei WANG
  Beijing University of Posts and Telecommunications
Jiawei LIANG
  Beijing University of Posts and Telecommunications
Hao WANG
  Beijing University of Posts and Telecommunications
Eiji OKI
  The University of Electro-Communications
Lin ZHANG
  Beijing University of Posts and Telecommunications

Keyword

LDPC, HARQ, Error Position Estimation Coding, targeted retransmission, incremental redundancy

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Yumei WANG, Jiawei LIANG, Hao WANG, Eiji OKI, Lin ZHANG, "ePec-LDPC HARQ: An LDPC HARQ Scheme with Targeted Retransmission" in IEICE TRANSACTIONS on Communications, vol. E99-B, no. 10, pp. 2168-2178, October 2016, doi: 10.1587/transcom.2016EBP3004.
Abstract: In 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) systems, when HARQ (Hybrid Automatic Repeat request) retransmission is invoked, the data at the transmitter are retransmitted randomly or sequentially regardless of their relationship to the wrongly decoded data. Such practice is inefficient since precious transmission resources will be spent to retransmit data that may be of no use in error correction at the receiver. This paper proposes an incremental redundancy HARQ scheme based on Error Position Estimating Coding (ePec) and LDPC (Low Density Parity Check Code) channel coding, which is called ePec-LDPC HARQ. The proposal is able to feedback the wrongly decoded code blocks within a specific MAC (Media Access Control) PDU (Protocol Data Unit) from the receiver. The transmitter gets the feedback information and then performs targeted retransmission. That is, only the data related to the wrongly decoded code blocks are retransmitted, which can improve the retransmission efficiency and thus reduce the retransmission overload. An enhanced incremental redundancy LDPC coding approach, called EIR-LDPC, together with a physical layer framing method, is developed to implement ePec-LDPC HARQ. Performance evaluations show that ePec-LDPC HARQ reduces the overall transmission resources by 15% compared to a conventional LDPC HARQ scheme. Moreover, the average retransmission times of each MAC PDU and the transmission delay are also reduced considerably.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/transcom.2016EBP3004/_p

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@ARTICLE{e99-b_10_2168,
author={Yumei WANG, Jiawei LIANG, Hao WANG, Eiji OKI, Lin ZHANG, },
journal={IEICE TRANSACTIONS on Communications},
title={ePec-LDPC HARQ: An LDPC HARQ Scheme with Targeted Retransmission},
year={2016},
volume={E99-B},
number={10},
pages={2168-2178},
abstract={In 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) systems, when HARQ (Hybrid Automatic Repeat request) retransmission is invoked, the data at the transmitter are retransmitted randomly or sequentially regardless of their relationship to the wrongly decoded data. Such practice is inefficient since precious transmission resources will be spent to retransmit data that may be of no use in error correction at the receiver. This paper proposes an incremental redundancy HARQ scheme based on Error Position Estimating Coding (ePec) and LDPC (Low Density Parity Check Code) channel coding, which is called ePec-LDPC HARQ. The proposal is able to feedback the wrongly decoded code blocks within a specific MAC (Media Access Control) PDU (Protocol Data Unit) from the receiver. The transmitter gets the feedback information and then performs targeted retransmission. That is, only the data related to the wrongly decoded code blocks are retransmitted, which can improve the retransmission efficiency and thus reduce the retransmission overload. An enhanced incremental redundancy LDPC coding approach, called EIR-LDPC, together with a physical layer framing method, is developed to implement ePec-LDPC HARQ. Performance evaluations show that ePec-LDPC HARQ reduces the overall transmission resources by 15% compared to a conventional LDPC HARQ scheme. Moreover, the average retransmission times of each MAC PDU and the transmission delay are also reduced considerably.},
keywords={},
doi={10.1587/transcom.2016EBP3004},
ISSN={1745-1345},
month={October},}

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TY - JOUR
TI - ePec-LDPC HARQ: An LDPC HARQ Scheme with Targeted Retransmission
T2 - IEICE TRANSACTIONS on Communications
SP - 2168
EP - 2178
AU - Yumei WANG
AU - Jiawei LIANG
AU - Hao WANG
AU - Eiji OKI
AU - Lin ZHANG
PY - 2016
DO - 10.1587/transcom.2016EBP3004
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E99-B
IS - 10
JA - IEICE TRANSACTIONS on Communications
Y1 - October 2016
AB - In 3GPP (3rd Generation Partnership Project) LTE (Long Term Evolution) systems, when HARQ (Hybrid Automatic Repeat request) retransmission is invoked, the data at the transmitter are retransmitted randomly or sequentially regardless of their relationship to the wrongly decoded data. Such practice is inefficient since precious transmission resources will be spent to retransmit data that may be of no use in error correction at the receiver. This paper proposes an incremental redundancy HARQ scheme based on Error Position Estimating Coding (ePec) and LDPC (Low Density Parity Check Code) channel coding, which is called ePec-LDPC HARQ. The proposal is able to feedback the wrongly decoded code blocks within a specific MAC (Media Access Control) PDU (Protocol Data Unit) from the receiver. The transmitter gets the feedback information and then performs targeted retransmission. That is, only the data related to the wrongly decoded code blocks are retransmitted, which can improve the retransmission efficiency and thus reduce the retransmission overload. An enhanced incremental redundancy LDPC coding approach, called EIR-LDPC, together with a physical layer framing method, is developed to implement ePec-LDPC HARQ. Performance evaluations show that ePec-LDPC HARQ reduces the overall transmission resources by 15% compared to a conventional LDPC HARQ scheme. Moreover, the average retransmission times of each MAC PDU and the transmission delay are also reduced considerably.
ER -