UAV Radio Connection Resumption via Context Pre-Sharing
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Solution Overview
Problem
In cellular communication systems, unmanned aerial vehicles (UAVs) experience increased interruption times due to rejected radio connection reestablishment requests when they cannot find a cell that can use the necessary context information, leading to connection failures and handover issues.
Innovation Solution
The UAV autonomously identifies a second cell that can use its context information and transmits a reestablishment request, and in cases where this is not possible, it sends a new connection request to ensure continuous communication, while the base stations pre-share context information to reduce delay in reestablishment processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station rejects the reestablishment request when UE context is not usable, then the system maintains strict context validation, but the interruption time increases and connection reliability deteriorates
Solution Approach 1:
The base station performs preliminary validation of UE context usability before rejecting the reestablishment request. By checking whether the UE context is usable in advance and only then deciding to reject or accept, the system avoids unnecessary rejection delays while maintaining validation integrity. This preliminary check allows the base station to prepare appropriate response messages (rejection or acceptance) more efficiently.
Solution Approach 2:
The system changes the response parameter from simple rejection to conditional response based on UE context usability. When the UE context is not usable, instead of always rejecting, the base station can transmit an acceptance message with appropriate parameters that allow the UE to establish a new connection, thereby reducing interruption time while maintaining system reliability.
2Reliability
If the base station transmits rejection message when UE context is not usable, then context validation is enforced, but the handover process complexity increases
Solution Approach 1:
The base station implements a universal response mechanism that handles both rejection and acceptance scenarios through a unified decision-making process. The same base station logic determines whether to reject or accept based on UE context usability, simplifying the overall handover process complexity while maintaining strict context validation. The response message structure is designed to accommodate both outcomes without requiring separate complex procedures.
3Speed
If the UAV autonomously identifies a suitable cell and transmits reestablishment request, then connection resumption speed improves, but the risk of selecting an inappropriate cell increases
Solution Approach 1:
The base station provides feedback to the UAV about whether the selected cell is appropriate for reestablishment. When the UAV autonomously identifies a cell and transmits a reestablishment request, the base station validates the selection by checking UE context usability and communicates the result back to the UAV. This feedback mechanism allows the UAV to learn from previous selections and improve future cell identification accuracy while maintaining fast connection resumption.
Data Source
AI summary
In a cellular communication system according to one embodiment, a user equipment configured to transmit, to a cellular communication network, a request message requesting to resume a radio connection in a predetermined state where the radio connection is suspended, and a base station configured to receive the request message is configured to transmit, to the user equipment, a response message indicating to establish a new radio connection, without transmitting, to the user equipment, a rejection message rejecting the request message even when a UE context corresponding to the user equipment transmitting the request message is not usable by the base station.