RLC PDU Header Extension Bit and Length Indicator Field Ordering
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Solution Overview
Problem
In mobile communication systems, particularly in LTE, the existing methods for transmitting and receiving Packet Data Units (PDUs) are inefficient due to the need for complex error correction and scheduling, leading to increased overhead in processing and resource utilization, especially in handling multiple Sequence Number fields and Extension Bits within RLC PDUs.
Innovation Solution
The proposed solution involves repositioning the Length Indicator (LI) field to succeed its associated Extension Bit field in the PDU header, allowing for efficient generation and transmission of PDUs, reducing the need for masking and shifting operations during reception, and optimizing the structure of RLC PDUs to minimize processing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the Length Indicator (LI) field is repositioned to succeed its associated Extension Bit field in the PDU header, then the processing overhead is reduced and processing speed is improved, but the header structure complexity increases
Solution Approach 1:
The PDU header is segmented into distinct functional fields (Extension Bit field and LI field) that are positioned sequentially. This segmentation allows the receiving device to process each field independently in a predetermined order, reducing the need for complex masking and shifting operations while maintaining structured organization for efficient parsing and interpretation
Solution Approach 2:
The Extension Bit field is positioned before the LI field to provide preliminary information about the presence of additional LI fields. This preliminary action allows the receiving device to prepare for subsequent processing by knowing in advance how many LI fields to expect, thereby streamlining the overall header parsing process and reducing computational overhead
2Loss of information
If masking and shifting operations are performed during PDU reception, then the Extension Bit and LI field can be extracted, but the processing time is increased
Solution Approach 1:
The patent replaces complex mechanical operations (masking and shifting) with a simpler field-based extraction method. By positioning the LI field to immediately succeed the Extension Bit field in the header structure, the receiving device can directly extract the LI value without performing time-consuming bit manipulation operations, thereby maintaining information extraction accuracy while significantly reducing processing time
Data Source
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AI summary
The present invention relates to a mobile communication system, and in particular, to a method and apparatus for transmitting and receiving a PDU including an Extension Bit field and a Length Indicator field in a UE or a Node B. A method for transmitting a PDU generated with more than two SDUs and a header having information on each SDU in a transmitter of a mobile communication system is provided. The method includes generating, in the header, a Length Indicator (LI) indicating an end point of each of remaining SDUs except for the last SDU and an Extension Bit indicating the presence/absence of another LI after each LI, and generating the header so that the LI succeeds the Extension Bit associated therewith; generating the PDU with the generated header and the SDUs; and transmitting the PDU.