Central Unit Control Plane PDCP Reset Signaling
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Solution Overview
Problem
The existing 5G radio communication systems face inefficiencies in resetting Packet Data Convergence Protocol (PDCP) count values for Acknowledged Mode (AM) data radio bearers due to the need for multiple control messages, increasing signaling and time required for the process.
Innovation Solution
A single control message is used to instruct the gNB-CU-UP to reset PDCP count values for AM DRBs, reducing the need for multiple messages and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple control messages are used to reset PDCP count values for AM DRBs, then the resetting process can be completed, but the signaling overhead and time required increase
Solution Approach 1:
The patent merges multiple control messages into a single control message that carries both the DRB identification information and the PDCP count value resetting indication. This consolidation eliminates the need for separate messaging steps, directly reducing signaling overhead and processing time while ensuring complete resetting of PDCP count values for AM DRBs.
2Reliability
If multiple control messages are used to reset PDCP count values for AM DRBs, then the resetting process can be completed, but the signaling overhead increases
Solution Approach 1:
The patent combines multiple pieces of information (DRB identification, PDCP count value resetting indication, and associated parameters) into a single control message. This merging approach reduces the number of signaling transactions and minimizes the total information exchanged between network nodes, thereby reducing signaling overhead while maintaining resetting completeness.
Solution Approach 2:
The control message is designed with multi-functionality, serving both to identify the target DRB and to trigger the PDCP count value resetting operation simultaneously. This universal message structure eliminates the need for separate dedicated messages, reducing overall signaling overhead while ensuring reliable resetting.
3Productivity
If a single control message is used to reset PDCP count values for AM DRBs, then signaling overhead and time are reduced, but the message structure becomes more complex
Solution Approach 1:
The control message is segmented into distinct fields and information elements, including DRB identification information and PDCP count value resetting indication. This structured segmentation organizes complex information into manageable components, making the message structure systematic and easier to process despite the increased information density.
Solution Approach 2:
The patent utilizes parameter changes within the control message structure to convey resetting instructions. By modifying specific parameters or information elements within the message to indicate resetting requirements, the system manages complexity through standardized parameter adjustments rather than requiring entirely new message formats.
Data Source
AI summary
An apparatus configured to operate as a central unit control plane (21) of a radio access network node (1) sends to a central unit user plane (22) of the radio access network node (1) a single control message indicating that one or more Packet Data Convergence Protocol (PDCP) count values for an Acknowledged Mode (AM) data radio bearer (DRB) already configured for a radio terminal (4) need to be reset. This can help, for example, to facilitate the resetting of a PDCP count value for an AM DRB by a radio access network node using an architecture in which its control plane and user plane are separated.