RLC SDU Segmentation and Concatenation for 2047 Byte Limit
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in handling RLC SDUs larger than 2047 bytes, as they can only effectively indicate the end of a PDU after less than 2048 bytes, leading to suboptimal segmentation and concatenation processes that waste capacity and increase processing requirements.
Innovation Solution
A method that partitions RLC SDUs into multiple PDUs, with one PDU limited to 2047 bytes, and uses a length indicator field to concatenate these PDUs, allowing for the formation of larger concatenated PDUs while ensuring that only the trailing PDU does not exceed the 2047 byte limit, thereby optimizing data transmission and reducing the number of PDUs needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RLC SDUs larger than 2047 bytes are segmented into multiple PDUs, then the data can be transmitted, but the number of PDUs increases and processing requirements increase
Solution Approach 1:
The patent merges multiple RLC PDUs into a single concatenated PDU structure. Specifically, it combines a first RLC PDU containing a first RLC SDU with a second RLC PDU containing a second RLC SDU into one concatenated PDU, reducing the total number of separate PDUs that need to be processed and transmitted individually.
Solution Approach 2:
The concatenated PDU structure serves multiple functions simultaneously: it carries multiple RLC SDUs from different logical channels, maintains individual SDU boundaries through length indicators, and presents a unified structure to higher layers, thereby reducing processing complexity while maintaining data integrity.
2Productivity
If RLC SDUs are segmented into smaller PDUs, then transmission is possible, but capacity is wasted and the segmentation process becomes suboptimal
Solution Approach 1:
The patent combines remaining capacity of one PDU with another PDU to form a concatenated structure, thereby utilizing the full available capacity of the transport block without leaving unused space. This merging approach eliminates the waste that occurs when single SDUs do not fully utilize the available PDU capacity.
Solution Approach 2:
The patent introduces a length indicator field that allows flexible indication of SDU boundaries within the concatenated PDU. This parameter change enables the system to adapt to different SDU sizes and configurations, optimizing the segmentation process rather than being constrained by fixed-size segments.
3Adaptability or versatility
If the RLC PDU size is limited to 2047 bytes, then compatibility is maintained, but larger SDUs require multiple PDUs increasing overhead
Solution Approach 1:
The patent nests multiple RLC SDUs within a single concatenated PDU structure, similar to nested dolls. The first RLC SDU and second RLC SDU are nested within the concatenated PDU, with each SDU's position and size indicated by length indicators, allowing multiple units of information to be contained within one transmission unit.
Solution Approach 2:
The patent merges multiple individual PDU transmissions into a single concatenated PDU transmission, thereby reducing the total number of PDUs that need to be handled. This combining approach maintains the 2047 byte limit for individual SDUs while reducing overall overhead through consolidation.
Data Source
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AI summary
Systems and methodologies are described that segment or concatenate radio link control (RLC) service data units (SDUs) into RLC protocol data units (PDUs). In accordance with various aspects set forth herein, systems and/or methods are provided that receive a first RLC SDU, partition the first RLC SDU into a first RLC PDU and a second RLC PDU, set a length indicator (LI) field associated with the second RLC PDU to indicate the size of information contained in the second RLC PDU, concatenate the second RLC PDU with a third RLC PDU associated with a second RLC SDU to form a concatenated RLC PDU, and dispatch the first RLC PDU, the concatenated RLC PDU, and a fourth RLC PDU associated with the second RLC SDU.