Header Compression Feedback for LTE-A Un Interface Double Headers
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Solution Overview
Problem
Current header compression profiles in ROHC protocols fail to effectively compress and differentiate between outer and inner IP headers, particularly excluding GTP headers, leading to inefficient compression and feedback processes in complex network architectures like LTE-A systems.
Innovation Solution
A feedback method and device for header compression that determines and processes header compression feedback information based on source type, allowing for separate and cascading compression of inner and outer headers, including GTP headers, using PDCP compressor and decompressor devices to maintain context information and improve data transmission efficiency at the Un interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single feedback format is used for both outer and inner header compression, then the feedback process is simplified, but the compression efficiency and accuracy deteriorate because the feedback cannot be effectively differentiated for different header types
Solution Approach 1:
The patent segments the feedback process by introducing separate feedback formats for outer header compression and inner header compression. The PDCP layer feedback handles outer IP/UDP headers while the GTP layer feedback handles inner IP/UDP/RTP headers, allowing each feedback mechanism to be optimized independently for its specific header type, thereby improving overall compression efficiency without excessive complexity
Solution Approach 2:
The patent introduces an intermediary feedback mechanism at the GTP layer that bridges the inner header compression needs with the overall PDCP layer compression framework. This intermediary layer enables differentiated feedback for inner headers while maintaining coordination with the outer header compression feedback, resolving the conflict between simplicity and efficiency
2Ease of manufacture
If GTP headers are excluded from compression profiles, then the compression implementation is simpler, but the overall compression ratio and data transmission efficiency deteriorate due to the complex nested header structure in LTE-A systems
Solution Approach 1:
The patent segments the header compression into two independent but coordinated processes: outer header compression for PDCP layer IP/UDP headers and inner header compression for GTP layer IP/UDP/RTP headers. Each segment has its own compression profile and feedback mechanism, making the implementation manageable while achieving high overall compression ratios for the nested header structure
Solution Approach 2:
The patent applies nested doll principle by implementing nested header compression where the inner GTP headers are compressed within the context of the outer PDCP headers. The feedback mechanisms are also nested, with GTP layer feedback providing inner header compression status that complements the PDCP layer outer header feedback, enabling efficient compression of the entire nested header structure
3Measurement precision
If separate feedback mechanisms are implemented for outer and inner headers, then the compression accuracy and context synchronization are improved, but the system complexity and processing overhead increase
Solution Approach 1:
The patent segments feedback into two distinct but coordinated mechanisms: PDCP layer feedback for outer headers and GTP layer feedback for inner headers. Each feedback mechanism maintains its own context independently, improving synchronization accuracy for each header type while the segmentation itself manages complexity by preventing context confusion between different header layers
Solution Approach 2:
The patent merges the two separate feedback mechanisms at the protocol stack level, where PDCP layer feedback and GTP layer feedback work together in a coordinated manner. The merging occurs in how the feedback information is integrated to achieve overall header compression, allowing high accuracy context synchronization without proportionally increasing system complexity through unified coordination
Data Source
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AI summary
The present invention discloses a feedback method and device for header compression feedback information: After RN is introduced in LTE-A system, user data transmitted at Un interface possesses a complex header structure with nesting double-IP containing GTP. Through application of the technical solution put forward by the embodiments of the present invention, different types of header compression feedback information carried in control PDU can be analyzed and processed with corresponding strategies according to the information in control PDU, thus effectively realizing separate compression and feedback for double headers and improving data transmission efficiency at Un interface.