HARQ Using Hierarchical Tree-Structured Physical Channel Identifiers in NOMA-Based Random Access for Multi-Packet Reception

Megumi Asada, Nobuhide Nonaka, Kenichi Higuchi

研究成果: Conference contribution査読

抄録

This paper proposes an efficient hybrid automatic repeat request (HARQ) method that simultaneously achieves packet combining and resolution of the collisions of physical channel identifiers (PCIDs) during retransmission in a non-orthogonal multiple access (NOMA)-based random access system for multi-packet reception. Here, the PCID functions as a separator for simultaneously received packets that use the same channel in NOMA. An example of this is a scrambling code used in 4G and 5G systems. Since users independently select the PCID, the decoding of received packets fails when multiple users select the same PCID. Random PCID reselection by each user when attempting retransmission can resolve the PCID collision; however, packet combining between the previous and retransmitted packets is not possible in this case because the base station receiver does not know the relationship between the PCID of the previously transmitted packet and that of the retransmitted packet. To address this problem, we propose employing novel hierarchical tree-structured PCID groups in which the PCID for the previous packet transmission has a one-to-one relationship to the set of PCIDs for retransmission. The proposed method resolves PCID collision at retransmission by randomly reselecting for each user a PCID from the dedicated PCID set from the previous transmission. Since the relationship between the PCIDs at the previous transmission and retransmission is known at the base station, packet combining is achieved simultaneously. Computer simulation results show the effectiveness of the proposed method.

本文言語English
ホスト出版物のタイトル2021 IEEE 94th Vehicular Technology Conference, VTC 2021-Fall - Proceedings
出版社Institute of Electrical and Electronics Engineers Inc.
ISBN(電子版)9781665413688
DOI
出版ステータスPublished - 2021
イベント94th IEEE Vehicular Technology Conference, VTC 2021-Fall - Virtual, Online, United States
継続期間: 27 9月 202130 9月 2021

出版物シリーズ

名前IEEE Vehicular Technology Conference
2021-September
ISSN(印刷版)1550-2252

Conference

Conference94th IEEE Vehicular Technology Conference, VTC 2021-Fall
国/地域United States
CityVirtual, Online
Period27/09/2130/09/21

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