Direct Mode Communication Path Switching via Backend Network Backup
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Solution Overview
Problem
In LTE networks, direct mode communication connections are less stable than backend network connections, leading to complex and inefficient connection switching procedures with significant packet loss during interruptions, as there is no primary mechanism to switch between communication paths.
Innovation Solution
A communication path switching method for direct mode communication apparatuses that maintains a backend network connection via a backend network server, allowing for seamless switching from direct communication connections to backend network connections when interruptions occur, using packet processing modules and transceivers to manage address translations and packet filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct mode communication connection is used, then communication speed and efficiency are improved, but connection stability deteriorates
Solution Approach 1:
The patent establishes a backend network connection in advance as a backup path before the direct mode connection fails. This preliminary preparation allows immediate switching to the backend connection when direct mode fails, eliminating the need for reactivation and reducing interruption time while maintaining high-speed communication when conditions permit direct mode.
2Reliability
If connection switching procedure is implemented, then connection stability is improved, but system complexity increases
Solution Approach 1:
The patent introduces a serving gateway as an intermediary component that automatically manages the switching between direct mode connection and backend network connection. This intermediary handles the complex switching logic and packet routing, simplifying the overall system architecture while providing stable connection switching without requiring complex procedures at the application layer.
3Ease of operation
If application-layer session initiation protocol is used, then connection management is achieved, but packet loss increases due to long interruption time
Solution Approach 1:
The patent maintains the backend network connection in a ready state before direct mode connection fails, allowing immediate switching without waiting for application-layer protocols to detect and respond to the failure. This preliminary preparation of the backup path eliminates the long interruption time that causes packet loss in application-layer approaches.
Solution Approach 2:
The patent replaces the application-layer session initiation protocol with a lower-layer switching mechanism implemented at the packet processing level. This substitution enables automatic, rapid switching between communication paths without the delays inherent in application-layer protocol handshakes, significantly reducing packet loss during connection transitions.
Data Source
AI summary
A transmitting direct mode communication apparatus, a receiving direct mode communication apparatus and a communication path switching method thereof are provided. The transmitting direct mode communication apparatus and the receiving direct mode communication apparatus maintain a backend network connection, and communicate with each other via a direct communication connection. The transmitting direct mode communication apparatus and the receiving direct mode communication apparatus are capable of switching the communication to backend network connection rapidly and seamlessly for transmitting data normally after the direct communication connection failed.