HARQ Feedback Control for Mixed NTN and MBS Downlink Scheduling
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Solution Overview
Problem
In communication systems combining non-terrestrial networks (NTN) and multimedia/broadcast multicast services (MBS), there is a conflict in Hybrid Automatic Repeat Request (HARQ) feedback configurations due to differing enabling/disabling configurations per HARQ process and group identifiers, leading to ambiguity for terminal devices on whether to enable HARQ feedback.
Innovation Solution
A method where terminal devices receive and determine HARQ feedback based on first and second indication information, with the first indicating feedback enablement for a group identifier and the second for a specific HARQ process, allowing clear determination of HARQ feedback transmission for Physical Downlink Shared Channels (PDSCHs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is enabled for NTN HARQ processes, then communication reliability is improved, but configuration conflict occurs when combined with MBS services
Solution Approach 1:
The patent segments the HARQ feedback configuration by introducing different indication mechanisms: first indication information for MBS group identifiers and second indication information for NTN HARQ processes. This segmentation allows independent configuration control for different service types, resolving the configuration conflict between MBS and NTN while maintaining communication reliability.
2Device complexity
If HARQ feedback configuration is unified for both MBS and NTN, then device complexity is reduced, but HARQ feedback determination becomes ambiguous
Solution Approach 1:
The patent applies local quality by providing different HARQ feedback indication information for different service contexts: first indication information specifically for MBS group identifiers and second indication information for NTN HARQ processes. This localized configuration approach maintains overall system simplicity while ensuring clear and unambiguous HARQ feedback determination for each specific service type.
Data Source
AI summary
Methods for wireless communication are provided. The method includes the following. A terminal device receives first indication information and second indication information, where the terminal device includes a first group identifier and a first hybrid automatic repeat request (HARQ) process, the first indication information indicates whether HARQ feedback is enabled for the first group identifier, and the second indication information indicates whether HARQ feedback is enabled for the first HARQ process. The terminal device determines, according to at least one of the first indication information or the second indication information, whether to transmit HARQ feedback information for a first physical downlink shared channel (PDSCH), where the first PDSCH is associated with the first HARQ process.