Unicast Sidelink Access Stratum Connection Maintenance
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Solution Overview
Problem
Current V2X systems face challenges in maintaining unicast sidelink connections due to increased communication requirements, which strain power and resource capabilities of portable UE devices, and legacy UEs unable to communicate directly with neighboring UEs without an intermediary base station, leading to issues in participating in V2X systems.
Innovation Solution
Implementing unicast sidelink access stratum level connection maintenance techniques, including radio link monitoring, radio resource management, and physical layer detection, to ensure the quality of sidelink connections and reconfigure them as needed, allowing access stratum layers to provide link quality indications to upper layers for better decision-making and potentially releasing radio links without explicit signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unicast sidelink connections are maintained with frequent monitoring and reconfiguration, then connection quality and QoS requirements are met, but power consumption and resource usage of portable UE devices increase
Solution Approach 1:
The patent implements periodic radio link monitoring at access stratum level, where wireless devices periodically evaluate radio link quality using reference signals and determine synchronization status. This periodic action allows the system to maintain connection quality through regular assessments while optimizing power consumption by only performing monitoring when necessary, rather than continuous monitoring.
Solution Approach 2:
The patent enables wireless devices to autonomously perform radio link monitoring and evaluation without requiring network intervention. The access stratum layer independently assesses radio link quality, determines synchronization status, and triggers reconfiguration or release decisions based on predefined criteria, reducing the need for power-intensive network coordination and signaling.
2Reliability
If access stratum level monitoring is implemented to detect link quality, then connection maintenance reliability improves, but device complexity increases
Solution Approach 1:
The patent segments the connection maintenance functionality into distinct access stratum level tasks: radio link monitoring, radio link evaluation, synchronization status determination, and reconfiguration triggering. This segmentation allows each component to operate independently with well-defined interfaces, managing complexity through modular architecture while maintaining reliable connection maintenance.
Solution Approach 2:
The patent introduces an access stratum level intermediary layer between the physical layer and upper layers. This intermediary performs radio link monitoring and evaluation, acting as a mediator that simplifies the interaction between lower physical layer functions and upper application layers, thereby managing system complexity while improving connection maintenance reliability.
3Reliability
If explicit signaling is used for radio link release, then connection release reliability is ensured, but signaling overhead and communication latency increase
Solution Approach 1:
The patent implements preliminary radio link monitoring and evaluation at the access stratum level, continuously assessing link quality before release is needed. By maintaining up-to-date synchronization status and radio link quality information in advance, the system can quickly determine when release is appropriate without requiring time-consuming explicit signaling exchanges, thus reducing release latency while ensuring reliability.
Solution Approach 2:
The patent establishes feedback mechanisms where the access stratum layer continuously monitors radio link quality and provides feedback on synchronization status. This feedback enables the system to autonomously determine when connection release is necessary based on predefined criteria, reducing the need for explicit release signaling and minimizing the time required for connection release while maintaining reliability.
Data Source
AI summary
Embodiments are presented herein of apparatuses, systems, and methods for performing unicast sidelink access stratum level connection maintenance. A first wireless device and a second wireless device may establish a unicast sidelink wireless connection. One or both of the first wireless device and the second wireless device may perform access stratum level connection maintenance on the unicast sidelink wireless connection. This may include performing any or all of radio link monitoring, radio resource management, or physical layer based link quality detection. The access stratum and the non-access stratum of each device may also communicate with each other regarding either or both of link quality or link status of the unicast sidelink wireless connection.