Multicast HARQ Feedback Indication with Adaptive Sidelink Control
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Solution Overview
Problem
Existing V2X communication systems lack flexibility in indicating Hybrid Automatic Repeat Request (HARQ) feedback modes for multicast communication, leading to inefficient data transmission.
Innovation Solution
A method and apparatus for indicating and determining HARQ feedback modes in multicast communication by using configuration information to select between different formats of sidelink control information (SCI), allowing flexible indication of HARQ feedback modes based on device capabilities and conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed SCI format is used for multicast communication, then the system structure is simple, but the flexibility in indicating HARQ feedback modes is insufficient
Solution Approach 1:
The patent applies dynamics by making the SCI format adaptable rather than fixed. The system dynamically selects between different SCI formats (first format and second format) based on whether the receiving device supports the optional HARQ feedback function. This dynamic format selection enables the system to flexibly indicate HARQ feedback modes while maintaining simplicity when the optional function is not needed.
Solution Approach 2:
The patent changes the parameter of SCI format structure based on device capabilities. When the receiving device supports the optional HARQ feedback function, the system uses a first SCI format with specific field configurations; when it doesn't support the optional function, a second SCI format is used. This parameter change approach allows flexible indication of HARQ feedback modes without permanently increasing system complexity.
2Measurement precision
If detailed configuration information is always transmitted, then the indication precision is high, but the information overhead increases
Solution Approach 1:
The patent applies partial action by transmitting only the necessary configuration information based on device capabilities. Instead of always transmitting detailed configuration information, the system transmits appropriate SCI formats selectively - using a compact second format when the optional HARQ feedback function is not supported, and a more detailed first format only when needed. This reduces information overhead while maintaining indication precision when required.
3Adaptability or versatility
If the SCI format is optimized for devices without optional HARQ feedback function, then compatibility is good, but the ability to support advanced feedback modes is limited
Solution Approach 1:
The patent achieves universality by designing multiple SCI formats that can serve different device types. The first SCI format is designed to support devices with optional HARQ feedback function, while the second format ensures compatibility with devices without this function. The system universally supports both device types by selecting the appropriate format, ensuring both advanced functionality and broad compatibility.
Solution Approach 2:
The patent uses copying by creating a simplified version (second SCI format) of the comprehensive format (first SCI format). The second format copies only the essential elements needed for basic communication with devices that don't support the optional HARQ feedback function, while the first format contains the complete information structure for advanced feedback modes. This copying approach ensures compatibility without sacrificing the ability to support advanced features when needed.
Data Source
AI summary
A method for indicating a feedback mode comprises the steps that a first device obtains configuration information, the configuration information being used for indicating whether the first device supports an optional function of hybrid automatic repeat request (HARQ) feedback; the first device sends sidelink control information (SCI) to a second device based on the configuration information, wherein the SCI comprises a first type of SCI and a second type of SCI, and one of the first type of SCI and the second type of SCI comprises a first field, the first field is used for indicating an HARQ feedback mode of multicast communication data transmission.