LTE Trunking System Fail Soft Mode Call Service
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Solution Overview
Problem
Existing LTE trunking systems face challenges in continuing trunking services when transitioning to a fail soft mode, with no effective solutions currently available to ensure uninterrupted communication.
Innovation Solution
The method involves determining the current working mode and updating trunking group and user information to switch from normal to fail soft mode, using SIB messages to indicate the mode and manage call services, including releasing and reallocating bearer context resources, and simulating DPS functions for security context clearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the T1 link fails in an LTE trunking system, then emergency group calling must be supported to ensure continuous communication, but the system loses access to complete trunking service functions and must operate in a limited fail-soft mode
Solution Approach 1:
The patent segments the trunking service into two operational modes: normal mode with complete service functions when T1 link is available, and fail-soft mode with limited emergency group calling functions when T1 link fails. This segmentation allows the system to maintain essential communication capabilities while acknowledging the loss of advanced features during link failure.
Solution Approach 2:
The patent implements beforehand cushioning by pre-configuring the system to automatically transition to fail-soft mode upon T1 link failure. The system prepares emergency operation protocols in advance, ensuring that group calling functionality remains available without requiring manual intervention or system reconfiguration during the crisis.
2Reliability
If the system operates in fail soft mode with limited functionality, then emergency group calling can be maintained, but normal trunking service functions and full system capabilities are lost
Solution Approach 1:
The patent applies dynamics by making the system operational characteristics adaptive rather than static. The system dynamically adjusts its service capabilities based on T1 link status, transitioning between normal and fail-soft modes. This dynamic behavior allows the system to optimize emergency communication reliability while accepting reduced productivity during link failure conditions.
3Reliability
If all trunking services are required to be processed by EPC PDS under normal conditions, then complete service isolation and private network isolation are achieved, but system complexity increases and single points of failure are created
Solution Approach 1:
The patent uses the T1 link as an intermediary component that connects the base station to the EPC PDS. This intermediary architecture enables service isolation and private network separation while providing a clear failure boundary. When the T1 link fails, the system can gracefully degrade without compromising the fundamental isolation capabilities that the intermediary structure provides.
Data Source
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AI summary
The disclosure discloses a method and device for implementing a call service and a method and device for sending indication information. The method includes that: a current working mode is determined to be switched from a normal mode into a fail soft mode; and whether or not update of trunking group information and user information has been completed currently is judged, and a trunking group is determined belonged to, according to a judgment result, to perfrom a call service. According to the technical solutions provided by the disclosure, the trunking call service of a terminal may still be implemented under the condition that an LTE trunking system is switched from the normal mode to the fail soft mode.