PDCP Lossless Transmission for Inter-Station Carrier Aggregation
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Solution Overview
Problem
In the context of inter-station carrier aggregation in LTE systems, existing data transmission methods face challenges in ensuring lossless and ordered data packet transmission across different stations, leading to potential packet loss and communication quality issues.
Innovation Solution
The proposed method involves a Packet Data Convergence Protocol (PDCP) entity that performs lossless transmission of PDCP protocol data units (PDUs) or service data units (SDUs) by submitting consecutive PDUs or SDUs in ascending order of their serial numbers, utilizing lossless and lossy transmission conditions indicated by the higher layer, and employing a packet discarding detection timer to optimize data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If inter-station carrier aggregation is implemented with multiple RLC entities on different stations, then application scenarios and transmission capacity are increased, but data transmission reliability and ordering are compromised
Solution Approach 1:
The patent segments the data transmission function by introducing a PDCP entity that operates independently from the RLC entities. The PDCP entity performs serial number assignment and lossless transmission control, while multiple RLC entities on different stations handle data transmission. This segmentation allows the system to maintain reliability through centralized PDCP control while enabling versatile inter-station carrier aggregation through distributed RLC entities.
2Productivity
If inter-station carrier aggregation is implemented with multiple RLC entities on different stations, then application scenarios and transmission capacity are increased, but data ordering is compromised
Solution Approach 1:
The patent implements a feedback mechanism where the PDCP entity assigns serial numbers to PDCP PDUs and tracks their transmission status. The PDCP entity receives acknowledgments from the receiving end and can retransmit lost or out-of-order packets. This feedback loop ensures that even with multiple RLC entities transmitting simultaneously, the receiving end receives data in the correct order according to serial numbers, maintaining data ordering stability while enabling high transmission capacity.
3Ease of manufacture
If conventional data transmission process is used in inter-station carrier aggregation, then implementation is simple, but packet loss occurs and communication quality deteriorates
Solution Approach 1:
The patent introduces a PDCP entity as an intermediary layer between the higher layers and multiple RLC entities. This PDCP intermediary performs lossless transmission control, serial number management, and retransmission functions. By placing this intermediary in place, the system maintains implementation simplicity through a clear layered structure while dramatically improving communication quality through centralized control of data integrity and ordering across multiple stations.
Data Source
AI summary
Embodiments of the present disclosure disclose a data transmission method and apparatus. The data transmission method includes: performing, by a Packet Data Convergence Protocol (PDCP) entity, lossless transmission on PDCP protocol data units (PDUs) or PDCP service data units (SDUs), where each of the PDCP PDUs or the SDUs is associated with one serial number. In this embodiment, during lossless transmission, no data packet is lost, thereby ensuring communication quality in an inter-station carrier aggregation scenario and achieving an optimization objective.