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  1. WebCharacteristics of 5G HARQ. ACK/NACK Timing in Slot Configuration. What is Redudandancy Version ? and How it works ? How many HARQ processor ? Example 01 > How HARQ Works ? The transmission and reception process involves transmitting data, receiving ACK or NACK, and …

  2. WebDec 16, 2021 · Learn how 5G NR Hybrid ARQ works at MAC and PHY layers to improve performance and reliability for URLLC and eMBB use cases. Understand the concepts of Incremental Redundancy, HARQ processes, feedback signalling and rate matching.

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    Synchronous HARQ is not suitable in 5G NR due to dynamic TDD and operation in unlicensed spectra. In LTE synchronous UL HARQ, the same process ID is used every eighth subframe. An LTE UE responds with HARQ ACK 3ms after receiving the downlink data. 5G NR has more flexibility to respond faster for URLLC use cases.
    HARQ entity distributes the traffic among its processes. Each process handles one TB at a time but if downlink spatial multiplexing is configured, two TB s are possible. In downlink, HARQ processes are also used for slot aggregation, also called TTI bundling. In this case, a TB is retransmitted without waiting for ACK.
    However, Release 13 introduced asynchronous UL HARQ that's used by License-Assisted Access ( LAA ). Synchronous HARQ is not suitable in 5G NR due to dynamic TDD and operation in unlicensed spectra. In LTE synchronous UL HARQ, the same process ID is used every eighth subframe.
    They note that in fast-fading channels HARQ is beneficial only at low SNR and counterproductive at high SNR. In such cases, ARQ at a higher layer is sufficient. In slow-fading channels, throughput gains due to HARQ are moderate particularly when AMC ignores the presence of HARQ. Nadeem et al. study the effectiveness of HARQ for 5G's URLLC use case.
  4. 第551回:HARQとは - ケータイ Watch Watch

  5. 5G | ShareTechnote

  6. Hybrid ARQ - Devopedia

    WebDec 18, 2021 · HARQ operates at MAC and PHY layers. 5G: Asynchronous and adaptive in both downlink and uplink. Up to 16 parallel processes, each using Stop-and-Wait. WiMAX: Supports both CC and IR. Up to 16 parallel processes each in

  7. A new HARQ scheme for 5G systems via interleaved ...

  8. Enhanced HARQ Design for 5G Wide Area Technology - IEEE ...

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