name: HARQ
full_form: Hybrid Automatic Repeat Request
context: at gNB. The is also used in the random access procedure, to determine the start time of RAR window/MsgB window after a Msg1/MsgA transmission (see TS 38.213 [38]). The Service link RTT, Feeder link RTT, RP, Common TA, and TTA (see clause 16.14.2.2) are illustrated in Figure 16.14.2.1-1. Figure 16.14.2.1-1: Illustration of timing relationship (for collocated gNB and NTN Gateway) The network may configure the HARQ operation as follows: - For downlink, HARQ feedback can be enabled or disabled per HARQ process (as specified in clause 5.3.2.2 and clause 5.7 of TS 38.321 [6]). Disabling HARQ feedback allows scheduling a HARQ process before one HARQ RTT has elapsed since last scheduled. - For uplink, HARQ mode (i.e. HARQ mode A or HARQ mode B) can be configured per HARQ process (as specified in clause 5.4.3.1 and clause 5.7 of TS 38.321 [6]). HARQ mode B allows scheduling a HARQ process before one HARQ RTT has elapsed since last scheduled. NOTE: For the HARQ processes configured with HARQ
description: Hybrid Automatic Repeat Request (HARQ) is a protocol used in telecommunications to manage retransmissions of data packets in wireless communication systems. It ensures reliable data transfer by automatically requesting retransmission of lost or corrupted packets, improving network efficiency.
explanation: The description explicitly states that HARQ is a 'protocol' used for managing data transmissions and ensuring reliability in wireless communication systems.
section_title: 6.7.1.1Cell Selection / GNSS location / NTN
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