LDPC Base Graph Selection from Control Information in NR
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Solution Overview
Problem
In New Radio communication systems, the transmitter and receiver may use different base graphs for encoding and decoding information bits due to channel distortion, leading to incorrect decoding when the receiver misses initial information bits and mistakenly uses an inconsistent base graph.
Innovation Solution
The method involves determining a redundancy version and a new data indicator through control information to select the appropriate base graph for encoding and decoding Low Density Parity Check (LDPC) codes, ensuring consistency between the transmitter and receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the receiver uses predefined base graphs for decoding without verifying consistency with transmitter, then decoding speed is improved, but decoding accuracy deteriorates when channel distortion occurs
Solution Approach 1:
The receiver determines a new data indicator from received control information and uses it to select the appropriate base graph, creating a feedback mechanism that ensures consistency between transmitter and receiver base graph selections, thereby resolving the contradiction between fast predefined decoding and accurate adaptive decoding
Solution Approach 2:
The system dynamically selects between different base graphs (BG1 or BG2) based on the new data indicator value, allowing the decoding process to adapt to changing channel conditions and transmission scenarios, improving reliability without sacrificing decoding speed
2Loss of time
If the receiver mistakenly treats retransmitted information bits as initial information bits, then processing time is reduced, but decoding reliability deteriorates due to wrong base graph selection
Solution Approach 1:
The new data indicator provides feedback information that allows the receiver to correctly identify whether received bits are initial transmission or retransmission, preventing wrong base graph selection and ensuring reliable decoding without adding significant processing time
Solution Approach 2:
The transmitter pre-encodes the new data indicator into the control information before transmission, allowing the receiver to immediately determine the correct base graph upon receiving control information, avoiding the need for time-consuming trial decoding with different base graphs
Data Source
AI summary
A system and method for allocating network resources are disclosed herein. In one embodiment, the system and method are configured to perform: determining a redundancy version and a new data indicator indicated by control information; determining a base graph of a low density parity check code based on which of a plurality of predefined conditions the redundancy version, and/or the new data indicator satisfy; and sending a signal comprising information bits that are encoded based on the determined base graph of the low density parity check code.