Sidelink Feedback Channel Resource Allocation for Multi-Block Reliability
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Solution Overview
Problem
In Internet of Vehicles systems using LTE D2D technology, there is a need for efficient feedback mechanisms to improve the reliability of sidelink transmission, particularly when multiple Transport Blocks or carriers are involved, as existing designs struggle to effectively transmit multi-bit feedback information.
Innovation Solution
The proposed solution involves a wireless communication method where a terminal device receives sidelink data and determines the need for multi-bit feedback. It configures a resource pool for a second-type sidelink feedback channel and allocates transmission resources to send this feedback, allowing for the reduction of feedback overhead and improved data transmission reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback information for multiple Transport Blocks or carriers is transmitted through separate sidelink feedback channels, then the reliability of sidelink transmission is improved, but the feedback overhead increases
Solution Approach 1:
The patent combines feedback information for multiple Transport Blocks and/or multiple carriers into a single sidelink feedback channel (PSFCH). The receiver terminal generates multi-bit feedback information that aggregates ACK/NACK status for multiple TBs and/or carriers, and transmits this consolidated feedback through one PSFCH resource, thereby reducing feedback overhead while maintaining comprehensive transmission reliability monitoring
Solution Approach 2:
The sidelink feedback channel is designed to serve multiple functions simultaneously: it can carry feedback for multiple Transport Blocks, multiple carriers, and provide both individual TB ACK/NACK and overall transmission status information. This multi-functional design allows a single feedback mechanism to handle diverse feedback requirements without requiring separate channels for each function
2Reliability
If feedback information for each Transport Block is transmitted separately, then the transmission reliability is improved, but the complexity of feedback management increases
Solution Approach 1:
The patent merges individual feedback management for multiple Transport Blocks into a unified feedback process. The receiver terminal consolidates ACK/NACK decisions for multiple TBs into a single multi-bit feedback message, and the transmitter terminal manages retransmission based on this aggregated feedback, significantly simplifying feedback management complexity while still tracking each TB's status individually through the multi-bit structure
3Loss of information
If multiple sidelink feedback channels are configured for multicarrier transmission, then the coverage of feedback information is improved, but the resource overhead increases
Solution Approach 1:
The patent combines feedback coverage for multiple carriers into a single sidelink feedback channel resource. The receiver terminal generates feedback information that covers all configured carriers and Transport Blocks, and transmits this comprehensive feedback through one PSFCH resource rather than requiring separate PSFCH resources for each carrier, thereby maintaining full feedback coverage while reducing resource overhead
Data Source
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AI summary
A wireless communication method and a terminal device. The method comprises: a first terminal receives a sidelink data channel and/or a sidelink reference signal sent by a second terminal; the first terminal determines a resource pool configuration and/or a transmission resource of a first sidelink feedback channel, wherein the first sidelink feedback channel is a second-type sidelink feedback channel, the second-type sidelink feedback channel is used to carry sidelink feedback information of the sidelink data channel and/or a measurement result of the sidelink reference signal, and the number of bits of information carried in the second-type sidelink feedback channel is greater than 1; and the first terminal sends the first sidelink feedback channel to the second terminal according to the resource pool configuration and/or the transmission resource of the first sidelink feedback channel.