PDCP Duplication and Compression for Wireless Latency Reduction
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Solution Overview
Problem
In wireless communication systems, the increased number of user equipment (UEs) and data transmission requirements pose challenges in efficiently utilizing limited radio resources, particularly in overcoming delay or latency issues, especially in applications sensitive to performance metrics like delay/latency.
Innovation Solution
A method for transmitting data units based on packet data convergence protocol (PDCP) duplication activation by a UE, where the PDCP entity is associated with multiple radio link control (RLC) entities and configured for PDCP duplication, involving steps like receiving a PDCP service data unit, constructing and duplicating PDCP protocol data units (PDUs), and transmitting them to RLC entities, with optional compression using techniques like Robust Header Compression (ROHC) or Uplink Data Compression (UDC).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCP duplication is activated to transmit multiple PDCP PDUs, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements PDCP duplication by creating copies of PDCP PDUs and transmitting them through multiple RLC entities simultaneously. This copying mechanism enhances transmission reliability by providing redundant transmission paths without fundamentally changing the PDCP entity structure, thus resolving the contradiction between reliability improvement and device complexity.
2Productivity
If PDCP SDU compression is applied to reduce data volume, then productivity is improved, but manufacturing precision deteriorates due to context mismatch
Solution Approach 1:
The patent segments the compression context management by maintaining separate compression contexts for each RLC entity associated with a PDCP entity. This segmentation prevents context mismatch between different transmission paths while still enabling compression benefits, thus resolving the contradiction between productivity improvement and manufacturing precision.
Solution Approach 2:
The patent dynamically adjusts compression parameters by detecting context mismatch conditions and adapting the compression state accordingly. When context mismatch is detected, the system modifies compression parameters or switches to uncompressed transmission for affected packets, maintaining precision while preserving overall productivity.
3Reliability
If multiple RLC entities are used for PDCP duplication, then reliability is improved, but loss of time increases due to processing overhead
Solution Approach 1:
The patent performs preliminary actions by pre-configuring multiple RLC entities and establishing their associations with PDCP entities before actual data transmission. This preliminary setup enables the PDCP entity to quickly duplicate and distribute packets to multiple RLC entities without extensive processing overhead during live transmission, thus resolving the contradiction between reliability improvement and time loss.
Data Source
AI summary
The present invention relates to a method of transmitting a data unit by a packet data convergence protocol (PDCP) entity of a user equipment (UE) in a wireless communication system. Especially, the PDCP entity is associated with at least two radio link control (RLC) entities and is configured with PDCP duplication. Further, the method includes the steps of receiving a PDCP service data unit (SDU) from an upper layer; constructing a PDCP protocol data unit (PDU) using the PDCP SDU; duplicating the PDCP PDU based on the PDCP duplication being activated; and transmitting the PDCP PDU and at least one duplicated PDCP PDU to the at least two RLC entity, wherein, based on the PDCP duplication being activated, constructing the PDCP PDU comprises compressing the PDCP SDU.