研究目的
To reduce unnecessary packet losses of level hybrid automatic repeat request transport block (TB) (HARQ) in 5G data channels by proposing a connected-coding retransmission (CCR) scheme for low-density parity-check (LDPC) codes.
研究成果
The proposed CCR scheme effectively reduces CB error rate and improves system throughput, especially under poor channel conditions and with large TB/CBG sizes. Future work will focus on reducing encoding and decoding complexity.
研究不足
The scheme is activated only when decoding fails after the last retransmission, and it requires larger PCM size and parity bits length for connected CBs, which may increase encoding and decoding complexity.
1：Experimental Design and Method Selection:
The study proposes a connected-coding retransmission (CCR) scheme for LDPC codes in 5G to reduce unnecessary packet losses. The methodology involves connecting failed CBs with new CBs for encoding and decoding.
2：Sample Selection and Data Sources:
The simulation uses 5G NR standard LDPC codes in block fading channel with CB size including CB-CRC length set to K = 200 and mother code rate set to R = 2/
3：List of Experimental Equipment and Materials:
The study uses BG2 of size 42 × 52 as the base matrix, lifting size Z = 20 for ordinary coding, and Z' = 40 for connected coding. The LDPC decoder used is sum-product decoder with 50 maximum iterations.
4：Experimental Procedures and Operational Workflow:
The process involves encoding failed CBs with new CBs, puncturing failed CBs before rate matching, and decoding by combining stored soft information with newly received information.
5：Data Analysis Methods:
The performance is analyzed through CB error rate and system throughput simulations under different SNR and CB number conditions.
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