Uplink Ciphering Parameter Synchronization in Unacknowledged Mode
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Solution Overview
Problem
In 3GPP systems, the uplink ciphering parameter synchronization in unacknowledged mode leads to service interruptions when errors occur in uplink data transmission, as there is no effective detection and recovery mechanism, requiring RRC reestablishment which is slow and disruptive.
Innovation Solution
A method and device for synchronizing the uplink ciphering parameter by detecting unrecoverable errors in uplink packets, sending indication messages to initialize the parameter, and receiving response messages to ensure synchronization without interrupting the communication link, allowing for faster and uninterrupted service recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RRC reestablishment is used to synchronize uplink ciphering parameter, then synchronization can be achieved, but service interruption occurs and recovery is slow
Solution Approach 1:
The patent extracts the ciphering parameter synchronization function from the RRC reestablishment procedure, creating an independent synchronization mechanism through indication messages that operates separately from service data transmission, thereby avoiding service interruption while maintaining synchronization reliability
Solution Approach 2:
The patent introduces indication messages as an intermediary mechanism to trigger ciphering parameter synchronization. These messages act as mediators between the network side and terminal, enabling parameter updates without requiring full RRC reestablishment, thus reducing service interruption time while ensuring synchronization
2Reliability
If no detection mechanism is implemented for uplink packet errors, then system complexity is reduced, but uplink ciphering parameter desynchronization cannot be detected and recovered
Solution Approach 1:
The patent implements a self-service detection mechanism where the network side autonomously monitors uplink packet reception status and automatically triggers indication messages when desynchronization is detected, eliminating the need for complex terminal-side detection while maintaining reliable parameter synchronization
Solution Approach 2:
The patent establishes a feedback loop where the network side monitors uplink packet reception, detects errors indicating desynchronization, and sends indication messages back to the terminal to trigger parameter resynchronization, achieving reliable parameter synchronization through a simple yet effective feedback-based detection mechanism
Data Source
AI summary
Embodiments of the present invention provide a method and a device for synchronizing an uplink ciphering parameter in unacknowledged mode. The method for synchronizing an uplink ciphering parameter in unacknowledged mode includes: sending an indication message to a terminal when detecting that an unrecoverable error occurs in an uplink packet or that the uplink packet is invalid, where the indication message is used to instruct the terminal to initialize an uplink ciphering parameter; receiving a response message sent by the terminal; and initializing the uplink ciphering parameter according to an initial value of the ciphering parameter. The embodiments of the present invention solve a service defect, namely, a break of the communication link caused by synchronization of an uplink ciphering parameter between the terminal and the radio network controller in unacknowledged mode, and shorten the time of synchronizing the uplink ciphering parameter without interrupting the service.