Sidelink Advanced Notification for Configured Grant Loss
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Solution Overview
Problem
In wireless communication systems, vehicles experiencing interruptions in the Uu link during handover processes or radio link failures lead to a loss of configured grant resources, resulting in Quality of Service (QoS) degradation for sidelink communications, which are critical for applications like platooning and autonomous driving.
Innovation Solution
A method for user equipment to determine limited availability of configured grant resources and send a message indicating this to other user equipment, allowing them to prepare for a less sensitive mode of operation, and a mechanism for base stations to configure user equipment with extended grant resources and provide parameters for such messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If configured grant resources are used for sidelink communications to achieve low transmission latency and high QoS, then transmission speed and reliability are improved, but the system becomes vulnerable to Uu link interruptions during handover or radio link failures
Solution Approach 1:
The transmitting UE sends an advanced notification message to peer UEs before the Uu link interruption occurs or before configured grant resources become unavailable. This preliminary action allows receiving UEs to proactively prepare for potential QoS degradation by switching to less sensitive modes of operation, thereby maintaining system reliability despite the vulnerability of configured grant resources to Uu link failures
2Reliability
If configured grant resources are used for sidelink communications, then quality of service is improved, but loss of these resources during handover or radio link failure causes QoS degradation
Solution Approach 1:
The system performs preliminary notification to peer UEs about potential configured grant resource unavailability before the actual loss occurs. This allows receiving UEs to advance prepare alternative operation modes, preventing QoS degradation rather than reacting after the harmful effect has manifested
Solution Approach 2:
The advanced notification mechanism acts as a cushioning measure that prepares the system in advance for potential Uu link failures. By notifying peer UEs beforehand, the system creates a buffer that allows graceful transition to alternative modes, cushioning against the harmful impact of configured grant resource loss during handover or radio link failures
3Reliability
If the system maintains configured grant resources during Uu link interruptions, then quality of service is preserved, but the complexity of resource management increases
Solution Approach 1:
The transmitting UE autonomously determines when configured grant resources may become unavailable and proactively notifies peer UEs without requiring continuous network intervention. This self-service approach allows the UE to independently manage resource availability information, reducing the need for complex network-controlled resource management mechanisms while maintaining QoS
Data Source
AI summary
For a UE in a wireless network and able to communicate via sidelink communications with other UE(s), the UE determines whether a specific condition exists indicating the UE has limited availability of CG resources used to communicate for the sidelink communications. The UE sends, using the sidelink communications, a message indicating the limited availability of the CG resources toward the other UE(s). Another UE receives the message indicating a limited availability of CG resources for the UE, and prepares an application in the other UE for a less sensitive mode of operation having less QoS than a mode having a normal QoS. A base station can configure the UE with the CG resources and provide a set of parameters to the UE to be used to form the message for the user equipment to transmit to the other UE(s) using sidelink communications.