Sidelink Relay Resource Scheduling to Reduce Forwarding Delay
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Solution Overview
Problem
In vehicle-to-everything (V2X) communication, the relay forwarding delay in sidelink scenarios is prolonged due to the inability of user equipment (UE) to indicate data volume to a relay UE through a PC5 communication interface, limiting the relay's ability to obtain transmission resources in advance.
Innovation Solution
A resource scheduling method where a first terminal device sends data volume information to a second device, enabling the second device to obtain a target resource in advance for forwarding data received from a sidelink, thereby reducing relay forwarding delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay device requests a resource to forward data after receiving data from UE, then the relay device can forward the data, but a long relay forwarding delay occurs
Solution Approach 1:
The patent applies preliminary action by enabling the UE to send indication information about to-be-transmitted data to the relay device before the actual data transmission. This allows the relay device to obtain transmission resources in advance, so when the data arrives, the relay device can immediately forward it without waiting for resource allocation, thus reducing the relay forwarding delay while ensuring reliable data forwarding capability
2Loss of time
If the UE sends a pre-emptive BSR to request transmission resource in advance, then the relay forwarding delay is reduced, but the UE cannot indicate data volume to relay UE through PC5 communication interface
Solution Approach 1:
The patent segments the information transmission process by separating the indication information (data volume, transmission time, delay budget) from the actual data transmission. The indication information is sent through the PC5 interface to the relay device, which then uses this information to obtain resources through the Uu interface. This segmentation allows the relay device to know in advance what resources are needed without requiring the UE to send detailed data volume information through the PC5 interface
3Productivity
If the relay UE obtains transmission resource by using pre-emptive BSR, then resource allocation is achieved, but the obtained resource is Uu transmission resource while sidelink transmission resource is needed
Solution Approach 1:
The patent uses the indication information as an intermediary that bridges the gap between the UE's sidelink transmission needs and the relay device's resource allocation. The indication information sent via PC5 interface enables the relay device to understand the UE's resource needs and obtain appropriate sidelink transmission resources, rather than Uu interface resources, thus improving both resource allocation efficiency and resource type compatibility
Data Source
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AI summary
This application provides a resource scheduling method, and a communication apparatus and system. In the method, there is a sidelink between a first terminal device and a second device, and there is a connection between the second device and a third communication device. The method is specifically as follows: The first terminal device sends indication information to the second device, where the indication information includes data volume information of to-be-transmitted data on the sidelink, and the data volume information of the to-be-transmitted data is used by the second device to obtain a target resource, and the target resource may be used by the second device to forward, to the third communication device, data received from the sidelink. By using this application, the second device may obtain a required resource based on the data volume information of the to-be-transmitted data in the indication information sent by the first terminal device, and forward, by using the required resource, the data received by the second device from the sidelink, to reduce a relay forwarding delay in sidelink communication.