PDCP Layer PDU Association Management
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Solution Overview
Problem
Current mobile communication systems cannot identify associations between Packet Data Units (PDUs) or between PDU sets or frames, leading to inefficient data transmission.
Innovation Solution
The introduction of a Packet Data Convergence Protocol (PDCP) layer that receives and processes Service Data Adaptation Protocol (SDAP) PDUs, including information such as frame types and Quality of Service (QoS) attributes, to facilitate efficient data transmission by accounting for associations between PDUs and PDU sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current mobile communication system processes data packets individually, then the system structure remains simple, but data transmission efficiency deteriorates due to inability to identify PDU associations
Solution Approach 1:
The patent segments the data transmission process into distinct phases: PDU set formation at the application layer, association identification at the PDCP layer, and individual packet processing at lower layers. This segmentation allows efficient association-based processing while maintaining clear functional boundaries that prevent excessive system complexity.
Solution Approach 2:
The PDCP layer serves as an intermediary between the SDAP layer (which handles individual PDUs) and the radio air interface (which transmits packets). This intermediary layer receives PDUs with association information, identifies PDU set relationships, and manages retransmission based on associations, thereby enabling efficient data transmission without requiring fundamental changes to the entire system architecture.
2Productivity
If the system cannot identify PDU associations, then the processing procedure remains simple, but data transmission efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by having the SDAP layer attach association information to PDUs before they reach the PDCP layer. This preliminary tagging of PDUs with their associated set identifiers allows the PDCP layer to efficiently identify and manage PDU relationships without adding complex processing steps during the actual data transmission phase.
Solution Approach 2:
The system implements feedback mechanisms where the PDCP layer uses association information to determine which PDUs need retransmission. When a PDU is lost, the feedback mechanism identifies all associated PDUs in the same set and triggers retransmission of the entire set, thereby improving data transmission efficiency through intelligent feedback-based retransmission management.
3Reliability
If individual PDU processing is used, then protocol implementation is simple, but multimedia service performance deteriorates
Solution Approach 1:
The patent merges multiple individual PDU processing operations into a unified association-based management approach. By grouping PDUs into sets and managing them as associated units, the system achieves better multimedia service performance through coordinated processing while the PDCP layer's dedicated functionality keeps the overall protocol implementation manageable.
Solution Approach 2:
The PDCP layer is designed with multi-functionality, handling both individual PDU processing and association-based PDU set management within the same layer. This universal approach allows the system to maintain simple protocol implementation at the radio layer while achieving enhanced multimedia service performance through the PDCP layer's dual capabilities.
Data Source
AI summary
A data transmission method includes: a PDCP layer receives a first SDAP PDU, which is sent by an SDAP layer, the first SDAP PDU being a downlink SDAP control PDU.