Sidelink MAC Control Signaling for Low-Latency V2X Reliability
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Solution Overview
Problem
Conventional V2X communication systems do not allow vehicles or user equipment (UEs) to separately transmit control messages, leading to poor transmission timeliness and inability to guarantee high reliability and service continuity, especially in advanced V2X services requiring low latency, high reliability, and large data transmission.
Innovation Solution
Implementing a reference signaling design and configuration for sidelink medium access control (MAC) elements (CEs) that include configuration information for sidelink and uplink MAC CEs, allowing UEs to determine resource allocation and transmission modes based on priority, scheduling requests, and timer management for improved data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional V2X communication systems are used, then device complexity is reduced, but transmission timeliness and reliability deteriorate
Solution Approach 1:
The patent segments the MAC protocol into separate control elements (MAC CE) for different functions: scheduling control, resource allocation, and data transmission. This segmentation allows independent optimization of each function, improving reliability without requiring complete system redesign, thus resolving the contradiction between reliability improvement and device complexity.
Solution Approach 2:
The patent implements preliminary resource allocation through configured grants and pre-configured sidelink grants, where resources are allocated in advance before actual data transmission. This preliminary action reduces transmission latency and improves timeliness while maintaining manageable system complexity through standardized configuration procedures.
2Loss of time
If separate control message transmission is enabled, then transmission timeliness is improved, but device complexity increases
Solution Approach 1:
The patent merges control signaling and data transmission into a unified MAC protocol framework, where control elements (MAC CE) are integrated with data packets. This merging allows control messages to be transmitted separately without requiring completely independent control channels, thus reducing latency while limiting the increase in device complexity through unified processing.
Solution Approach 2:
The patent implements dynamic resource allocation mechanisms where the MAC entity can adaptively select between different transmission modes (configured grant, dynamic grant, sidelink grant) based on real-time conditions. This dynamic approach optimizes transmission timeliness by choosing the fastest available mode while managing complexity through standardized decision logic.
3Duration of action of stationary object
If timer management for service continuity is implemented, then service continuity is improved, but device complexity increases
Solution Approach 1:
The patent implements continuous timer management where the MAC entity maintains timers in a persistent state across transmission opportunities. Timers are restarted and updated continuously to track service continuity requirements, ensuring uninterrupted service while managing complexity through standardized timer operations rather than complex continuous coordination.
Solution Approach 2:
The patent incorporates feedback mechanisms where transmission status is monitored and fed back to the MAC entity, which adjusts timer management accordingly. This feedback loop allows the system to adapt timer operations based on actual transmission success, improving service continuity while limiting complexity through automated feedback-based adjustments rather than manual configuration.
Data Source
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AI summary
A system and method for reference signaling design and configuration are disclosed herein. In one embodiment, the system and method are configured to receive, by a first wireless communication device from a wireless communication node, configuration information of a sidelink medium access control (MAC) control element (CE). The system and method are also configured to transmit, by the first wireless communication device according to the configuration information, the sidelink MAC CE to a second wireless communication device.