NTN PDSCH SPS Scheduling With Configurable HARQ Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing semi-persistent scheduling (SPS) configurations and hybrid automatic repeat request (HARQ) feedback for physical downlink shared channels (PDSCH) in non-terrestrial networks (NTN), particularly in terms of reliability and latency-sensitive services.
Innovation Solution
A method and apparatus for configuring SPS configurations with enabled or disabled HARQ feedback, based on SPS configuration information, using DCI to activate SPS and determine HARQ feedback for PDSCH, and transmitting ACK/NACK signals accordingly, with activation or deactivation determined by redundancy version, HARQ process number, and modulation and coding scheme fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is enabled for SPS configuration, then reliability is improved, but latency increases due to feedback transmission time
Solution Approach 1:
The patent applies dynamics by making the HARQ feedback mechanism configurable and adaptable. The network can dynamically enable or disable HARQ feedback for SPS configurations based on service requirements, allowing the system to switch between reliability-oriented mode (HARQ enabled) and latency-oriented mode (HARQ disabled) as needed different services
Solution Approach 2:
The patent changes the parameter of HARQ feedback status from a fixed state to a configurable state. Through SPS configuration information and DCI signaling, the system can adjust the HARQ feedback parameter between enabled and disabled states, allowing optimization for different service scenarios without changing the underlying SPS mechanism
2Adaptability or versatility
If multiple SPS configurations are supported with different HARQ feedback settings, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent segments the SPS configuration into multiple independent configuration sets, each with its own HARQ feedback setting. This allows the UE to maintain multiple SPS configurations (first SPS configuration with HARQ enabled, second SPS configuration with HARQ disabled) and switch between them based on service requirements, improving adaptability while keeping each individual configuration relatively simple
Solution Approach 2:
The patent creates a universal SPS configuration mechanism that can serve multiple functions. The same SPS configuration framework supports both HARQ-enabled and HARQ-disabled modes, allowing a single system to handle diverse service requirements (reliability-sensitive and latency-sensitive services) without requiring separate dedicated mechanisms for each case
Data Source
AI summary
Various embodiments provide a method for receiving a physical downlink shared channel (PDSCH) from a non-terrestrial network (NTN) by a terminal in a wireless communication, and a device therefor. Disclosed are a method and a device therefor, the method comprising the steps of: receiving semi-persistent scheduling configuration information; receiving first downlink control information (DCI) for activating an SPS configuration related to the SPS configuration information; receiving the PDSCH on the basis of the SPS configuration; and determining, on the basis of the SPS configuration, whether to perform hybrid automatic repeat and request (HARQ) feedback of an HARQ process for the PDSCH.