Code Block Group HARQ Feedback for NR Transport Blocks
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Solution Overview
Problem
In wireless communication systems, especially in New Radio (NR) systems, the current Hybrid Automatic Repeat request (HARQ) feedback mechanism often results in unnecessary retransmissions of entire Transport Blocks (TBs) even if only a few Code Blocks (CBs) are incorrectly received, leading to wastage of system resources.
Innovation Solution
A method and apparatus that determine whether a Transport Block is a retransmitted block, allowing for precise decoding of Code Block Groups (CBGs) within a TB by using Downlink Control Information (DCI) signals, enabling targeted retransmissions of only the incorrectly received CBGs, thereby avoiding unnecessary retransmissions and improving reception accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If HARQ feedback is performed in units of TBs, then the feedback mechanism is simple to implement, but all data in a TB must be retransmitted even if only one or few CBs are falsely received, leading to system resource waste
Solution Approach 1:
The patent segments the Transport Block into multiple Code Block Groups (CBGs) for independent feedback and retransmission. Each CBG can be individually acknowledged or requested for retransmission, allowing selective retransmission of only the erroneous segments rather than the entire TB, thus reducing system resource waste while maintaining implementation feasibility.
2Device complexity
If HARQ feedback is performed in units of TBs, then the feedback structure is simple, but unnecessary retransmission occurs when only a few CBs are incorrectly received
Solution Approach 1:
The feedback structure is segmented to include CBG-level acknowledgments in addition to TB-level feedback. This allows the system to identify and retransmit only the specific CBGs that contain errors, improving retransmission efficiency without significantly increasing overall feedback structure complexity.
Solution Approach 2:
The patent applies different feedback granularities to different parts of the TB structure. CBGs containing errors receive targeted retransmission requests, while error-free CBGs are acknowledged without retransmission, optimizing resource utilization based on local quality conditions of each CBG.
3Ease of operation
If entire TBs are retransmitted, then the retransmission process is simple to manage, but the reception correct rate decreases due to unnecessary retransmission of correctly received data
Solution Approach 1:
The retransmission process is segmented to operate at the CBG level rather than the entire TB level. This allows the system to manage retransmissions more precisely by targeting only the erroneous CBGs, thereby improving the reception correct rate while maintaining manageable operational complexity through standardized CBG handling procedures.
Data Source
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AI summary
The embodiments of the present invention provide a configuration method for sending and receiving data and an apparatus thereof, the method comprises receiving a first configuration signal sent from a network device by a terminal device, wherein, the first configuration signal is for indicating whether a first Transport Block to be sent by the network device is a retransmitted Transport Block, and the first configuration signal contains DCI information of the first Transport Block; receiving the first Transport Block sent from the network device by a terminal device, wherein, the first Transport Block comprises at least one Code Block Group; decoding the Code Block Group in the first Transport Block by a terminal device according to the DCI information of the first Transport Block. By means of the technical scheme of the present invention, the decoding manner of various Code Block Groups in a Transport Block can be precisely determined, so that the CBGs can be received with a greater correct rate, and unnecessary retransmission can be avoided.