Circular Buffer Rate Matching for Burst Multiplexing
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Solution Overview
Problem
In mobile communication systems, the Circular Buffer Rate Matching (CBRM) technique leads to performance degradation due to burst errors when RLC data blocks are sequentially mapped to and carried by multiple bursts without external channel interleaving, especially when turbo codes are used, as it results in overlapping data during retransmissions, affecting the Incremental Redundancy (IR) technique's performance.
Innovation Solution
The method involves selecting specific bitstreams for transmission and retransmission using a circular buffer, with predetermined rate matching patterns to minimize overlap and optimize data distribution across bursts, employing a channel encoder, rate matching unit, multiplexer, and transmitter to manage data transmission efficiently, and a demultiplexer and channel decoder for reconstruction, thereby reducing burst errors and improving decoding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RLC data blocks are sequentially mapped to multiple bursts without external channel interleaving, then device complexity is reduced, but burst errors occur leading to performance degradation
Solution Approach 1:
The patent divides the circular buffer into multiple segments corresponding to different bursts, and maps data blocks to specific segments based on predetermined patterns. This segmentation approach distributes data across multiple bursts without requiring external interleaving, reducing system complexity while maintaining reliability through controlled distribution.
Solution Approach 2:
The patent establishes predetermined rate matching patterns and mapping rules before transmission. These preliminary configurations define how data blocks are distributed across bursts and how circular buffers are allocated, eliminating the need for dynamic interleaving decisions and reducing complexity while ensuring reliable data distribution.
2Ease of operation
If data blocks are mapped sequentially to bursts, then ease of operation is improved, but overlapping data during retransmissions degrades IR technique performance
Solution Approach 1:
The patent defines predetermined rate matching patterns that specify exactly which circular buffer segments are used for each burst and retransmission. This preliminary configuration prevents overlapping data selection during retransmissions while maintaining simple sequential mapping operations.
Solution Approach 2:
The patent applies different mapping strategies to different parts of the transmission process. Initial transmissions use one pattern, while retransmissions use predetermined patterns that select different circular buffer segments, ensuring no overlap occurs. This localized differentiation maintains operational simplicity while improving IR performance.
3Ease of manufacture
If conventional rate matching patterns are used, then ease of manufacture is improved, but performance degradation occurs in GERAN systems with turbo codes
Solution Approach 1:
The patent modifies the rate matching parameters by establishing predetermined patterns specific to GERAN systems and turbo codes. These parameter changes optimize the circular buffer segmentation and burst mapping for the specific code structure, improving decoding performance while maintaining implementation simplicity through standardized patterns.
Data Source
AI summary
A method and apparatus for circular buffer-based rate matching and burst multiplexing for data transmission. According to the method and apparatus, rate matching patterns are efficiently determined according to data code rates in a wireless communication system using CBRM, and burst multiplexing is performed in units of bits without using an external channel interleaver when several RLC data blocks are transmitted via radio blocks. Accordingly, data bits are distributed into and carried by a plurality of bursts, thereby improving transmission performance.