Network-Scheduled Sidelink Transmission for Half-Duplex V2X Reachability
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Solution Overview
Problem
The half-duplex mode in vehicle-to-everything (V2X) communications systems prevents communications devices from simultaneously transmitting and receiving information, leading to an information unreachable problem.
Innovation Solution
A method where a first communications device sends a request message to a network device to schedule a resource for sidelink information transmission with a second communications device, using a resource corresponding to a multicast group, and receives an indication from the network device to ensure the information reaches the second device, thereby resolving the half-duplex issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If half-duplex mode is used for sidelink communication, then device complexity is reduced, but information reachability deteriorates because a device cannot transmit and receive simultaneously
Solution Approach 1:
The network device acts as an intermediary that receives request messages from the first communications device, schedules appropriate resources, and provides indication information to ensure the second communications device can receive the sidelink information. This mediator approach resolves the half-duplex limitation by coordinating transmission and reception timing through network control.
2Reliability
If network device scheduling is implemented to ensure information reachability, then information reachability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The communication process is segmented into distinct phases: the first communications device sends a request message to the network device, the network device schedules resources and provides indication information, and then the actual sidelink transmission occurs. This segmentation allows each component to perform its function independently, reducing overall system complexity while ensuring information reachability.
3Reliability
If explicit identification of the second device is required in request messages, then information reachability is improved, but message complexity and signaling overhead increase
Solution Approach 1:
The first communications device identifies the second communications device implicitly through the request message sent to the network device. The network device uses this information to schedule resources and provide indication information that enables the second device to receive the sidelink information without requiring explicit identification in the original request message, thus reducing message overhead while maintaining reachability.
Data Source
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AI summary
Embodiments of this application provide an information transmission method, a communications device, and a network device. The information transmission method may include: sending, by a first communications device, a request message to a network device, to request the network device to schedule a resource for transmission of sidelink information between the first communications device and a second communications device; and further receiving indication information that is used to indicate the resource and that is sent by the network device, and sending the sidelink information to the second communications device on the resource. In the embodiments of this application, reachability of the sidelink information can be ensured.