Sidelink Feedback Multiplexing and Bundling for HARQ Efficiency
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Solution Overview
Problem
Current sidelink communication systems in device-to-device (D2D) and Internet of Things (IoT) scenarios face inefficiencies in Hybrid Automatic Repeat Request (HARQ) feedback, leading to unnecessary retransmissions and degraded communication performance due to inflexible semi-static feedback modes, which are not suitable for varying numbers of transport blocks.
Innovation Solution
A communication apparatus and method that employs multiplexing and bundling of feedback bits based on the number of received transport blocks to generate feedback information, optimizing the use of feedback channels and reducing unnecessary retransmissions by controlling the number of bits transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If semi-static feedback mode is used in sidelink communication, then feedback channel structure is simplified, but communication performance degrades due to unnecessary retransmissions when number of transport blocks varies
Solution Approach 1:
The patent applies dynamics by making the feedback mode adaptive rather than fixed. The receiving device dynamically selects between multiplexing and bundling modes based on the actual number of transport blocks received. When the number of transport blocks is less than a threshold, multiplexing mode is used to provide detailed feedback for each block. When the number exceeds the threshold, bundling mode is used to reduce feedback overhead. This dynamic adaptation resolves the contradiction by allowing the system to maintain simple feedback structures (bundling) when needed while enabling detailed feedback (multiplexing) when the number of transport blocks is small, thus improving communication efficiency without permanently complicating the feedback channel structure.
2Measurement precision
If multiplexing mode is used for all feedback bits, then feedback precision is improved, but feedback overhead increases unnecessarily when number of transport blocks is large
Solution Approach 1:
The patent applies parameter changes by adjusting the feedback mode based on the parameter of transport block count. A threshold parameter is defined to determine when to switch between multiplexing and bundling modes. When the number of transport blocks is below the threshold, the system uses multiplexing mode to maintain high feedback precision by providing individual feedback for each transport block. When the number exceeds the threshold, the system switches to bundling mode to reduce feedback overhead by combining multiple feedback bits. This parameter-based adaptation resolves the contradiction by ensuring high feedback precision is maintained only when necessary, while reducing overhead when the number of transport blocks is large.
3Quantity of substance
If bundling mode is used for all feedback bits, then feedback overhead is reduced, but feedback information accuracy decreases leading to unnecessary retransmissions
Solution Approach 1:
The patent applies dynamics by making the feedback mode adaptive rather than fixed. The receiving device dynamically selects between multiplexing and bundling modes based on the actual number of transport blocks received. When the number of transport blocks is less than a threshold, multiplexing mode is used to provide detailed feedback for each block. When the number exceeds the threshold, bundling mode is used to reduce feedback overhead. This dynamic adaptation resolves the contradiction by allowing the system to maintain simple feedback structures (bundling) when needed while enabling detailed feedback (multiplexing) when the number of transport blocks is small, thus improving communication efficiency without permanently complicating the feedback channel structure.
4Productivity
If flexible feedback handling is implemented, then communication performance improves, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by adjusting the feedback mode based on the parameter of transport block count. A threshold parameter is defined to determine when to switch between multiplexing and bundling modes. When the number of transport blocks is below the threshold, the system uses multiplexing mode to maintain high feedback precision by providing individual feedback for each transport block. When the number exceeds the threshold, the system switches to bundling mode to reduce feedback overhead. This parameter-based adaptation resolves the contradiction by ensuring high feedback precision is maintained only when necessary, while reducing overhead when the number of transport blocks is large.
Data Source
AI summary
There are provided a communication apparatus and a method. The communication apparatus comprising: a receiver, operative to receive, in a first time period, a plurality of transport blocks (TBs) transmitted by another communication apparatus; and circuitry, operative to generate a plurality of feedback bits respectively for the received TBs, and perform at least one of multiplexing and bundling on at least a part of the feedback bits according to the number of the feedback bits to generate feedback information.