PDCP HFN Signaling for Faster Window Resynchronization
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Solution Overview
Problem
Data communication is suspended for a long time due to the re-initialization of the Window when the reception of the response signal generated in response to transmitted data fails in existing radio communication technologies.
Innovation Solution
A transmitting apparatus generates and transmits PDCP data containing information about a part of the HFN value to a receiving apparatus, allowing the receiving apparatus to update its HFN value, thereby avoiding the need for re-initialization and reducing communication suspension time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitting apparatus sends an RRC message with full configuration to initialize the window upon detecting a failure to receive a response signal, then the window can be re-initialized, but data communication is suspended for a long time
Solution Approach 1:
The invention segments the window initialization process by transmitting only the necessary HFN value information through PDCP data rather than sending a complete RRC reconfiguration message. This selective transmission of critical parameters (HFN bits) enables partial initialization that resolves the window stall without requiring full protocol reconfiguration, thereby reducing the communication suspension time while maintaining reliability.
Solution Approach 2:
The transmitting apparatus performs preliminary action by including the HFN value in the PDCP data that is already being transmitted for other purposes. Instead of waiting for the window stall to be fully detected and then initiating a separate RRC reconfiguration process, the HFN information is proactively included in ongoing PDCP transmissions, allowing the receiving apparatus to update its window state sooner and resume communication faster.
2Loss of time
If the transmitting apparatus transmits PDCP data containing HFN value information, then window resynchronization is achieved faster, but the PDCP data structure becomes more complex
Solution Approach 1:
The invention merges the window resynchronization function with the existing PDCP data transmission function. By combining the HFN value information with regular PDCP data packets that are already being transmitted for user plane or control plane communication, the patent achieves window resynchronization without requiring separate signaling messages or additional protocol layers, thus minimizing the increase in data structure complexity.
Solution Approach 2:
The PDCP data structure is enhanced to serve multiple functions simultaneously: it carries both the original user plane or control plane data and the HFN value information needed for window resynchronization. This multi-functionality allows the same data structure to perform both data transmission and window state synchronization, eliminating the need for dedicated resynchronization messages and reducing overall system complexity.
Data Source
AI summary
A transmitting apparatus (10, 20) includes a control unit (12, 22) configured to generate PDCP (Packet Data Convergence Protocol) data containing information indicating at least a part of a HFN (Hyper Frame Number) held in the transmitting apparatus, and a transmitting unit (11, 21) configured to transmit the PDCP data generated by the control unit to a receiving apparatus.