Sidelink Control Information Adaptation for V2X HARQ Clarity
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Solution Overview
Problem
In V2X communication, the ambiguity in interpreting Hybrid Automatic Repeat Request (HARQ) feedback at transmitting terminal devices occurs due to the inclusion of device identification in both sidelink control information (SCI) and HARQ feedback, leading to increased SCI size when device identification of the transmitting terminal device is always included.
Innovation Solution
The method determines whether to include a link identification field in SCI based on the establishment of sidelinks, reducing the size of SCI by excluding device identification when only one sidelink exists and using a link identification when multiple sidelinks are present, thereby avoiding ambiguity in HARQ feedback interpretation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If device identification is always included in SCI, then reliability of HARQ feedback interpretation is improved, but SCI size increases
Solution Approach 1:
The patent applies dynamics by making the SCI format adaptable based on the number of active sidelinks. When only one sidelink exists, device identification is omitted from SCI. When multiple sidelinks exist, device identification is included. This dynamic adjustment resolves the contradiction by optimizing SCI size while maintaining HARQ feedback interpretation reliability through conditional inclusion of identification information.
Solution Approach 2:
The patent applies local quality by differentiating the SCI structure based on the specific communication context (number of sidelinks). Instead of using a uniform SCI format, the patent tailors the inclusion of device identification to the local condition of sidelink multiplicity, thereby avoiding unnecessary information transmission while ensuring reliable HARQ feedback interpretation when needed.
2Reliability
If device identification is always included in SCI, then ambiguity in HARQ feedback interpretation is avoided, but communication efficiency decreases
Solution Approach 1:
The patent makes the SCI format dynamic based on the number of active sidelinks. When a single sidelink is active, device identification is excluded from SCI, improving communication efficiency. When multiple sidelinks are active, device identification is included to avoid HARQ feedback ambiguity. This dynamic approach resolves the contradiction between reliability and productivity.
Solution Approach 2:
The patent extracts the device identification field from SCI when it is not necessary for disambiguation (i.e., when only one sidelink exists). This extraction eliminates unnecessary information transmission, improving communication efficiency while maintaining HARQ feedback interpretation clarity through the use of link identification alone.
3Reliability
If link identification field is included in SCI, then HARQ feedback ambiguity is avoided in multi-sidelink scenarios, but SCI size increases
Solution Approach 1:
The patent applies dynamics by conditionally including the link identification field in SCI based on the number of active sidelinks. When multiple sidelinks are active, link identification is included to avoid HARQ feedback ambiguity. When a single sidelink is active, link identification is excluded to minimize SCI size. This resolves the contradiction by adapting SCI composition to the communication context.
Solution Approach 2:
The patent applies preliminary action by establishing link identification before multi-sidelink communication begins. The receiving terminal device determines the number of sidelinks in advance and configures the appropriate SCI format accordingly, preventing HARQ feedback ambiguity before it occurs while avoiding unnecessary information inclusion.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable mediums for sidelink communication. The method comprises receiving, at a first terminal device and from a second terminal device, an indication whether a link identification field is to be included in sidelink control information. The method further comprises in response to a determination that the indication indicates that the link identification field is not to be included in the sidelink control information, transmitting, to the second terminal device, first sidelink control information via a sidelink between the first terminal device and the second terminal device, the first sidelink control information including a device identification of the second terminal device, and receiving, from the second terminal device, a first HARQ feedback for the first sidelink control information, the first HARQ feedback including the device identification.