HARQ Feedback Control via RRC and DCI Signaling
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Solution Overview
Problem
The New Radio (NR) system faces challenges in supporting Hybrid Automatic Repeat reQuest (HARQ) feedback for multicast and broadcast services, particularly in scenarios like the Internet of Vehicles and Industrial Internet, where it is unclear how to enable or disable HARQ feedback effectively.
Innovation Solution
The method involves using Radio Resource Control (RRC) signaling and Downlink Control Information (DCI) to indicate whether HARQ feedback is enabled or disabled, allowing for semi-static or dynamic control of HARQ feedback in the NR system, thereby supporting HARQ feedback for multicast and broadcast services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback is enabled for multicast MBS services, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies dynamics by making the HARQ feedback enable/disable status configurable through different signaling mechanisms. The network can dynamically adjust the feedback mode between semi-persistent (RRC configured) and dynamic (DCI indicated) based on service requirements, allowing the system to adapt complexity levels to reliability needs.
Solution Approach 2:
The patent changes the control parameter from a fixed HARQ feedback state to a configurable parameter that can be set via RRC signaling or DCI. This allows the system to vary the feedback mechanism parameters (semi-persistent vs. dynamic mode) to balance reliability and complexity based on specific service conditions.
2Ease of operation
If semi-persistent HARQ feedback control is used, then ease of operation is improved, but adaptability worsens
Solution Approach 1:
The patent applies universality by creating a unified control mechanism that can operate in multiple modes. The same RRC signaling framework can configure both semi-persistent feedback and trigger dynamic feedback changes via DCI, making the system universally applicable to different service scenarios without requiring separate control mechanisms for each mode.
Solution Approach 2:
The patent makes the feedback control dynamic by allowing the network to switch between semi-persistent and dynamic feedback modes based on service requirements. This dynamic capability enables the system to adapt to different scenarios while maintaining operational simplicity through a unified control approach.
3Adaptability or versatility
If dynamic HARQ feedback control via DCI is used, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent merges the HARQ feedback control functionality into the existing DCI structure. By combining the feedback mode indication with the standard DCI signaling, the patent avoids adding separate complex control mechanisms and integrates the adaptability feature within the existing signal processing framework.
Solution Approach 2:
The patent changes the control parameter delivery method from purely RRC configuration to DCI-based dynamic configuration. This parameter change enables the system to adapt feedback behavior based on real-time conditions while utilizing existing DCI processing mechanisms, thereby limiting the increase in device complexity.
Data Source
AI summary
A feedback state indication method and apparatus, a terminal device and a network device are provided. The method includes: a terminal device receives RRC signaling sent by a network device, the RRC signaling carrying first indication information or second indication information. The first indication information is used for indicating that HARQ feedback is enabled or disabled, and the second indication information is used for indicating that the HARQ feedback is controlled by downlink control information to be enabled or disabled.