PDCP Data Reordering Window Boundary Update Strategy
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Solution Overview
Problem
In 5G mobile communication systems, packet data convergence protocol (PDCP) data transmission at a fixed rate leads to data packets falling outside the reception windows of user equipment (UE), resulting in packet loss due to varying reception window speeds across multiple UEs in point-to-multipoint mode.
Innovation Solution
A method and communication device that update the boundary value of the data reordering window based on a specified strategy, such as an indication message or preset rule, to ensure data packets fall within the reception window of each UE, preventing packet loss by adapting the window's update speed to the transmission rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data transmission is performed at a fixed rate, then transmission simplicity is maintained, but packet loss occurs due to mismatch between transmission rate and reception window update speed
Solution Approach 1:
The patent implements dynamic reordering window management where the window boundary is no longer fixed but adapts based on received packet sequence numbers. The reception entity dynamically updates the reordering window boundary to match the latest received packet, allowing the window to expand and contract based on actual transmission patterns rather than maintaining a predetermined fixed size, thereby preventing packet loss without requiring complex rate adaptation mechanisms
Solution Approach 2:
The system employs self-service mechanisms where the reception entity autonomously manages its own reordering window based on incoming packet information. Each reception entity independently tracks its own window boundary and adjusts it based on its specific reception pattern, eliminating the need for centralized control or complex coordination between transmission and reception entities while maintaining reliable packet delivery
2Reliability
If reordering window size is increased to accommodate varying reception speeds, then packet loss is prevented, but memory usage and processing overhead increase
Solution Approach 1:
The patent changes the parameter of reordering window boundary from a static predetermined value to a dynamic value that evolves based on received packet sequence numbers. Instead of allocating a large fixed buffer to accommodate all possible variations, the system dynamically adjusts the window boundary parameter to match actual reception needs, reducing memory buffer requirements while maintaining packet reception reliability through adaptive boundary management
3Reliability
If individual reordering windows are maintained for multiple UEs, then packet loss is prevented for each UE, but system complexity increases
Solution Approach 1:
The patent segments the reordering window management into independent per-UE entities, where each UE maintains its own separate reordering window boundary state. This segmentation allows each UE to independently manage its packet reception without interfering with other UEs, simplifying the overall system architecture by avoiding the need for complex shared window management or coordination mechanisms while ensuring reliable individual packet delivery for each UE
Data Source
AI summary
A method for transmitting data, includes: updating, on the basis of a specified strategy, a boundary value of a data reordering window, where the specified strategy is any one of the following strategies: a first indication message and a preset rule obtained. In this way, through the method for transmitting data, a packet data convergence protocol (PDCP) data reception entity updates the boundary value of the data reordering window according to the specified strategy of a PDCP data transmission entity.