SDT Head Compression via PDCP Context Storage
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Solution Overview
Problem
In wireless mobile communication systems, especially in 5G networks, there is a challenge in efficiently managing head compression during small data transmission operations for terminals, particularly in maintaining low latency and supporting higher data rates.
Innovation Solution
The method involves receiving a RRCRelease message that includes information for small data transmission (SDT), determining radio bearers configured for SDT, discarding stored PDCP Service Data Units and Protocol Data Units, storing Ethernet Header Compression information, and reestablishing PDCP entities to resume radio bearers and configurations for SDT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If head compression is maintained during SDT operation in RRC_INACTIVE state, then data transmission efficiency is improved, but PDCP entity configuration complexity increases
Solution Approach 1:
The patent applies preliminary action by storing EHC information and PDCP configurations in the UE INACTIVE AS context before entering RRC_INACTIVE state. This pre-storation allows the terminal to quickly resume head compression functionality during SDT operation without complex real-time configuration, thereby improving data transmission efficiency while avoiding configuration complexity during active transmission.
Solution Approach 2:
The patent uses copying by creating and maintaining a copy of PDCP configurations and EHC information in the UE INACTIVE AS context. This copied configuration data can be quickly restored during SDT operation without requiring complex real-time negotiation, enabling efficient head compression while simplifying the configuration management process.
2Loss of time
If PDCP entities are reestablished for SDT operation, then small data transmission latency is reduced, but resource management overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-storing PDCP configurations and EHC information in the UE INACTIVE AS context before entering inactive state. When SDT operation is needed, these pre-stored configurations can be quickly restored without full reestablishment procedures, thereby reducing small data transmission latency while minimizing resource management overhead through efficient configuration reuse.
3Productivity
If Ethernet Header Compression information is stored in UE INACTIVE AS context, then head compression efficiency is improved, but memory usage increases
Solution Approach 1:
The patent applies the taking out principle by extracting and storing only the essential EHC information and PDCP configuration parameters in the UE INACTIVE AS context, rather than storing complete protocol stacks or redundant data. This selective extraction maintains head compression efficiency while minimizing memory usage by storing only the critical configuration elements needed for quick resume operation.
Data Source
AI summary
A Method and Apparatus for head compression is provided. The method includes receiving a RRCRelease, the RRCRelease includes a first information for SDT, determining a one or more radio bearers configured for SDT based on the first information, discarding all stored Packet Data Convergence Protocol Service Data Unit and PDCP Protocol Data Unit in PDCP entity of SRB1, discarding all stored Packet Data Convergence Protocol Service Data Unit and PDCP Protocol Data Unit in PDCP entity of SRB2 if the SRB2 indicator is included in the RRCRelease, storing Ethernet Header Compression information in INACTIVE Stratum a User Equipment Access context, receiving SystemInformationBlock1, the SystemInformationBlock1 includes a second information for SDT, initiating a SDT based on the first information and the second information, reestablishing a PDCP entity for the SRB1 and resuming the SRB1, restoring PDCP configurations of the radio bearers configured for SDT, and resuming the radio bearers.