Channel Decoding with Historical Soft-Value Combining
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Solution Overview
Problem
Services in the UMTS system that do not support MAC-layer HARQ experience higher retransmission rates and poorer quality of service due to long retransmission times at the RLC layer, particularly for services like signaling and R99 packet-switched services.
Innovation Solution
A channel decoding method and apparatus that combines demodulated soft values from historical records with current soft values for retransmitted data blocks, using sequence numbers to match historical records and improve decoding success rates, thereby reducing retransmissions and enhancing service quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RLC layer retransmission is used for services without MAC-layer HARQ support, then data can be retransmitted, but retransmission time is long and retransmission rate is high
Solution Approach 1:
The patent stores demodulated soft values in a buffer before channel decoding is attempted. When decoding fails, these pre-buffered soft values are reused for retransmission decoding without requiring new demodulation, thereby reducing retransmission time and improving decoding success rate
Solution Approach 2:
The patent creates a copy of the demodulated soft values and stores them in a buffer for later use. This copied data can be reused when retransmission occurs, eliminating the need to重新 demodulate and reducing the retransmission time penalty
2Reliability
If RLC layer retransmission is used for services without MAC-layer HARQ support, then data can be retransmitted, but retransmission efficiency is low
Solution Approach 1:
The patent performs preliminary buffering of demodulated soft values before decoding attempts. This preparation allows rapid retransmission processing by reusing existing soft values, significantly improving retransmission efficiency while maintaining high decoding success rates
Solution Approach 2:
The system uses its own previously demodulated soft values to service retransmission decoding needs. By self-reusing the buffered soft values without external intervention or new demodulation processes, the system improves retransmission efficiency
Data Source
AI summary
Embodiments of the present invention disclose a channel decoding method, apparatus, and system. The channel decoding apparatus includes a memory storing instructions; and a processor coupled to the memory to execute the instructions to: obtain decoding information of first channel decoding of a data block; determine whether the first channel decoding fails; in response to determining that the first channel decoding fails, obtain a reference sequence number of the data block; obtain at least one matching historical demodulated soft value; combine the demodulated soft value of the data block and the at least one matching historical demodulated soft value to obtain a combined demodulated soft value of the data block; and perform second channel decoding on the combined demodulated soft value of the data block.