Sidelink Retransmission Feedback Timing for Half-Duplex Conflict Avoidance
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Solution Overview
Problem
Current wireless communication technologies lack an effective feedback retransmission mechanism for sidelink communication in half-duplex scenarios, leading to conflicts and errors in data transmission due to half-duplex interference, particularly in vehicle-to-everything (V2x) communication.
Innovation Solution
A retransmission feedback method for sidelink communication that involves generating and sending feedback information for each retransmission, using a pre-configured or configured feedback time interval, to avoid conflicts and improve data reception success rates in half-duplex operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a new DCI format is designed to support both downlink and uplink retransmission scheduling, then scheduling flexibility is improved, but control signal overhead and processing complexity increase
Solution Approach 1:
The patent segments the retransmission scheduling function into separate downlink and uplink processes. Downlink retransmissions are scheduled using PDCCH indications, while uplink retransmissions are scheduled using PUCCH feedback and subsequent PDCCH grants. This segmentation avoids the need for a complex unified DCI format while maintaining scheduling flexibility for both directions independently.
Solution Approach 2:
Instead of using a new DCI format to schedule both downlink and uplink retransmissions directly, the patent inverts the approach by using PUCCH feedback to trigger uplink retransmission scheduling. The network first receives HARQ-ACK feedback on PUCCH, then sends separate PDCCH downlink control information to schedule the uplink retransmission, thereby avoiding complex DCI formatting while achieving bidirectional scheduling capability.
2Device complexity
If PUCCH resource allocation is restricted to specific slots, then resource management is simplified, but scheduling flexibility and user experience deteriorate
Solution Approach 1:
The patent implements dynamic PUCCH resource allocation where the network can flexibly assign PUCCH resources in different slots based on traffic conditions and user needs. The terminal receives dynamic indications from the network about which slots to use for PUCCH feedback, allowing the system to adapt to varying scheduling requirements while maintaining manageable resource allocation through centralized network control.
3Adaptability or versatility
If PUCCH feedback is delayed to enable network scheduling of uplink retransmission, then scheduling control is improved, but feedback timeliness and user experience deteriorate
Solution Approach 1:
The patent employs preliminary action by having the terminal prepare and send PUCCH feedback in advance at the first available opportunity after receiving the downlink transmission. Instead of waiting for network scheduling decisions, the terminal proactively provides HARQ-ACK feedback on PUCCH, which then triggers the network to send uplink retransmission scheduling grants. This preliminary feedback action reduces overall delay while maintaining network scheduling control.
Data Source
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AI summary
The present disclosure relates to a method and device for retransmitting a feedback for direct-connection communication and related to the technical field of communications. The method is executed by a first terminal. The method comprises: during a process of retransmitting direct-connection data with a second terminal, generating feedback information for each instance of retransmission in retransmissions, the feedback information being used for indicating whether the direct-connection data is correctly received, the retransmissions comprising at least one retransmission; acquiring a feedback resource for each instance of retransmission in the retransmissions; and, on the feedback resource for each instance of retransmission, transmitting feedback information of each instance of retransmission to the second terminal. The present disclosure, when terminals are directly communicating with each other, with a first terminal performing a feedback with respect to the direct-connection data of each instance of retransmission of the second terminal, prevents the problem of a conflict occurring between the feedback information and other information when transmitting data with other devices in a half-duplex state, and increases the success rate of feedback with respect to retransmitted data between the terminals.