CrossRAT Sidelink Configuration Feedback Mechanism
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Solution Overview
Problem
Current signaling protocols in crossRAT sidelink configurations, such as when a 5G gNB controls an LTE V2X UE, lack support for the UE to send acknowledgments for correct reception and decoding of RRC messages, leading to incomplete configuration procedures.
Innovation Solution
The UE sends an RRC reconfiguration complete message or triggers a failure procedure to inform the network about successful or unsuccessful implementation of configuration information, ensuring network awareness of the configuration status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE sends an acknowledgment message to confirm correct reception of RRC configuration messages, then the reliability of configuration procedures is improved, but the signaling overhead and message complexity increase
Solution Approach 1:
The patent implements a feedback mechanism where the UE sends an RRC reconfiguration complete message to the network after successfully applying crossRAT sidelink configuration parameters. This feedback loop allows the network to confirm correct configuration application, resolving the technical contradiction by improving reliability through acknowledgment while managing signaling overhead through targeted feedback only when configuration is successfully applied.
2Loss of information
If the current crossRAT sidelink configuration signaling is used without acknowledgment support, then the signaling overhead is reduced, but the configuration procedure completeness and reliability deteriorate
Solution Approach 1:
The patent introduces a feedback mechanism where the UE sends an RRC reconfiguration complete message to confirm successful configuration application. This resolves the contradiction by providing necessary acknowledgment to ensure configuration completeness while maintaining efficient signaling through targeted feedback only when needed.
Solution Approach 2:
The patent uses the existing RRC reconfiguration complete message as an intermediary carrier to convey configuration status information. Instead of creating a separate dedicated acknowledgment message, the status is embedded in the existing reconfiguration complete message, thus ensuring configuration completeness without significantly increasing signaling overhead.
3Loss of information
If the UE triggers a failure procedure to inform the network of unsuccessful configuration implementation, then the network awareness of configuration status is improved, but the device complexity and procedure complexity increase
Solution Approach 1:
The patent implements feedback for both successful and unsuccessful configuration scenarios. When configuration fails, the UE triggers a failure procedure that sends an RRC reconfiguration failure message to the network, providing complete status information while using standardized failure reporting mechanisms to manage complexity.
Solution Approach 2:
The patent changes the status parameter in the RRC message to indicate failure condition. By reusing existing message structures and only changing the status indicator parameter, the patent provides comprehensive network awareness of configuration status without significantly increasing device or procedure complexity.
Data Source
AI summary
In one aspect, there is provided a method performed by a terminal device. The terminal device has a first connection with a serving base station using a first radio-access technology, and a second connection with one or more nodes using a second radio-access technology. The method comprises: receiving, from the serving base station over the first connection, a connection configuration message, the connection configuration message comprising configuration information for the second connection; and, responsive to successful implementation of the configuration information for the second connection, transmitting a first response message to the serving base station over the first connection, the first response message comprising an indication that the configuration information was successfully implemented.