Ciphering Configuration Synchronization in 3G System Relocation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The third generation mobile communication system faces increased call-dropping probability due to unsynchronized ciphering configurations between user devices and wireless networks during system relocation, leading to data encrypting/decrypting errors and transmission failures.
Innovation Solution
A method is introduced where user devices and wireless networks are synchronized to use a new ciphering configuration during system relocation by suspending transmission, changing to the new configuration, and then resuming, ensuring both parties communicate with the same configuration, thereby reducing transmission failures and call-dropping probabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE and UTRAN use different ciphering configurations during system relocation, then the system can proceed with relocation procedures, but data encrypting/decrypting errors occur and transmission reliability deteriorates
Solution Approach 1:
The patent applies preliminary action by having the UE suspend transmission before changing ciphering configuration, and by having the UTRAN wait for confirmation before changing its configuration. This ensures both parties are synchronized before data transmission resumes, preventing encrypting/decrypting errors while maintaining relocation functionality
Solution Approach 2:
The patent implements feedback mechanisms where the UE sends confirmation messages to the UTRAN after changing ciphering configuration, and the UTRAN provides status information back to the UE. This feedback loop ensures both parties know when the configuration change is complete, maintaining synchronization and transmission reliability
2Reliability
If the UE transmits measurement reports using old ciphering configuration while UTRAN uses new configuration, then measurement reporting can continue, but call-dropping probability increases
Solution Approach 1:
The patent applies preliminary action by suspending measurement report transmission before ciphering configuration changes take effect. This prevents the timing conflict where UE would send reports with old configuration while UTRAN expects new configuration, thereby maintaining call continuity without transmission failures
Solution Approach 2:
The patent implements dynamic adaptation by allowing the system to temporarily suspend normal transmission operations during configuration transition, then resume with synchronized configurations. This dynamic approach ensures measurement reporting continues without interruption to the overall relocation process while preventing call drops
3Manufacturing precision
If the system requires strict synchronization of ciphering configurations, then data encrypting/decrypting accuracy improves, but transmission procedures become more complex
Solution Approach 1:
The patent merges the configuration change procedures of UE and UTRAN into a coordinated sequence. By combining the suspension, change, and resumption steps into a unified synchronization protocol, the system achieves precise encryption/decryption accuracy without requiring separate complex synchronization mechanisms for each device
Solution Approach 2:
The patent uses confirmation messages and status indicators as intermediaries to coordinate configuration changes between UE and UTRAN. These intermediary signals ensure both parties are synchronized without requiring direct complex interaction, simplifying the overall synchronization procedure while maintaining encryption accuracy
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A communication system, user device thereof, and a synchronization method thereof are provided. The communication system includes a user device and a wireless network. A ciphering configuration information is transmitted to a user device. The user device and wireless network re-establishing the radio link control (RLC) entity of logical link. The user device changes to the new ciphering configuration immediately following the re-establishment of RLC entity according to the received ciphering configuration information and the wireless network changes to the new ciphering configuration.