RLC SDU Encapsulation Without Concatenation for Lower Latency
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Solution Overview
Problem
Existing wireless communication systems face challenges in data processing efficiency due to high processing complexity and latency, particularly at the RLC layer, which performs concatenation and reordering of RLC service data units, leading to increased overheads and delays.
Innovation Solution
The proposed solution involves encapsulating RLC service data units into protocol data units without concatenation, using a simplified header structure that includes a segment indicator and sequence number to indicate complete or segmented RLC service data units, thereby reducing processing complexity and latency at both the transmit and receive ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If concatenation and reordering of RLC service data units are performed at the RLC layer, then data transmission reliability is improved, but processing complexity and latency increase
Solution Approach 1:
The patent extracts the concatenation function from the RLC layer and relocates it to the MAC layer. The RLC layer now only performs segmentation and reordering of individual RLC SDUs, while the MAC layer handles concatenation of multiple RLC PDUs into MAC PDUs. This separation reduces the processing complexity at the RLC layer while maintaining data transmission reliability through preserved reordering capabilities.
2Productivity
If concatenation of multiple RLC service data units is performed at the RLC layer, then data processing efficiency is improved, but processing latency increases
Solution Approach 1:
The patent segments the data processing function into two independent parts: RLC layer segmentation (splitting RLC SDUs into RLC PDUs) and MAC layer concatenation (combining RLC PDUs into MAC PDUs). This segmentation allows parallel processing at different layers, reducing the sequential processing latency while maintaining overall data processing efficiency.
Solution Approach 2:
The RLC layer performs preliminary segmentation of RLC SDUs into RLC PDUs with proper header information before passing them to the MAC layer. This preliminary action enables the MAC layer to efficiently concatenate multiple pre-processed RLC PDUs without additional segmentation overhead, reducing total processing latency.
3Loss of substance
If concatenation processing is performed at the RLC layer, then data transmission overhead is reduced, but processing complexity at the receive end increases
Solution Approach 1:
The patent introduces the MAC layer as an intermediary that handles the complex concatenation operations. The MAC layer concatenates multiple RLC PDUs into MAC PDUs with appropriate MAC headers, reducing the number of RLC layer headers needed and thus reducing overall transmission overhead. The receive end MAC layer performs the reverse operation, simplifying RLC layer processing.
Data Source
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AI summary
A data processing method provided in an embodiment of this application includes: receiving, by a data sending apparatus, a data packet from a PDCP layer, where the data packet is used as an RLC SDU; and encapsulating, by the data sending apparatus, the RLC SDU into at least one RLC PDU, where each the RLC PDU encapsulated at an RLC layer by the data sending apparatus includes a header and a payload, and the payload is used to carry data from a single RLC SDU. It can be learned that a transmit end no longer performs concatenation processing at the RLC layer on the data packet. In this way, concatenation processing at the transmit end is reduced, and processing complexity and processing latency are further reduced. In addition, processing at a receive end also becomes simpler and more efficient.