MAC PDU Splitting with Per-Block CRC for HARQ Efficiency
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Solution Overview
Problem
In mobile communication systems, especially those with high transmission rates and multi-carrier modes, existing HARQ schemes face inefficiencies due to high overhead and latency when transmitting large information blocks, particularly in error detection and retransmission processes.
Innovation Solution
The method involves splitting large information blocks into smaller transport blocks, performing HARQ processes on each split-subburst, and transmitting them through multiple subframes or resource blocks, with a cyclic redundancy check (CRC) attached to each block, allowing for efficient error detection and reduced retransmission of only error-detected blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single CRC is attached to a large-size information block, then the error detection coverage is complete, but a small number of bit errors causes the entire block to be retransmitted, reducing system throughput
Solution Approach 1:
The patent divides the large information block into multiple smaller transport blocks, each with its own CRC. This segmentation allows error detection to be performed at a finer granularity, so that only the affected transport blocks need retransmission rather than the entire large block, thereby improving system throughput while maintaining reliable error detection.
2Productivity
If the information block size is increased to achieve high data transmission rate, then the transmission capacity is improved, but the HARQ latency and overhead increase
Solution Approach 1:
The patent segments large information blocks into smaller transport blocks for transmission. This reduces the size of each block undergoing HARQ processing, thereby reducing the time required for error detection and retransmission operations. The segmentation enables higher data transmission rates while minimizing HARQ latency through smaller, faster-to-process units.
3Adaptability or versatility
If the information block is transmitted through multiple subframes, then the transmission flexibility is improved, but the control overhead is increased
Solution Approach 1:
The patent segments the information block into transport blocks that can be transmitted across multiple subframes. Each segment maintains its own CRC and control information, allowing flexible transmission adaptation while minimizing control overhead by processing and managing smaller, independent units rather than one large block across multiple subframes.
Data Source
AI summary
A method is described for transmitting signals in a mobile communication system which splits an information block into a plurality of split-information blocks and performs a hybrid automatic repeat request (HARQ) process upon each of the split-information blocks. A method is also described for reducing control information overhead by transmitting control information only through one control channel when splitting an information block and transmitting split-information blocks through a plurality of subframes or a plurality of resource blocks. The segmentation of the information block is performed in a physical layer to reduce medium access control (MAC) overhead and to simplify implementation.