Terminal Device RAT Selection via Service Mapping
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Solution Overview
Problem
In device-to-device (D2D) communications systems, particularly in Internet of Vehicles (IoV), there is a lack of determinate solutions for terminal devices to reliably determine the appropriate Radio Access Technology (RAT) for data transmission, which is crucial for ensuring efficient and reliable data exchange.
Innovation Solution
The proposed solution involves configuring terminal devices with specific configuration information that indicates the correspondence between services and Radio Access Technologies (RATs), using identifiers such as Provider Service Identifier (PSID) or Intelligent Transportation System Application Identifier (ITS-AID), and access layer parameters like 64QAM modulation, transmit diversity, and carrier aggregation, to determine the optimal RAT for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device uses multiple communication interfaces (PC5 and Uu) for V2X message transmission, then the reliability of data transmission is improved, but the device complexity increases due to the need to determine and manage multiple RATs
Solution Approach 1:
The patent changes the parameter of RAT selection from a complex multi-factor decision process to a simplified mapping-based selection. By pre-configuring mapping relationships between service types and RATs, the system transforms the selection criterion from evaluating multiple parameters to simply matching service identifiers with pre-determined RAT options, thereby reducing determination complexity while maintaining reliable transmission through appropriate RAT selection
Solution Approach 2:
The network device performs preliminary action by pre-configuring the mapping relationships between services and RATs before the terminal device needs to make transmission decisions. This advance configuration eliminates the need for complex real-time analysis at the terminal, allowing straightforward RAT determination while ensuring optimal transmission paths are predetermined for different service requirements
2Productivity
If the terminal device autonomously determines the best RAT based on QoS requirements, then the transmission efficiency is improved, but the difficulty of detecting and measuring appropriate RAT increases
Solution Approach 1:
The patent introduces an intermediary mapping relationship configured by the network device that mediates between QoS requirements and RAT selection. Instead of the terminal device directly analyzing QoS parameters and determining RATs (which is complex), the pre-configured mapping serves as an intermediary that translates service identifiers into appropriate RAT choices, simplifying the detection and measurement process while maintaining efficient transmission through QoS-aware routing
3Ease of operation
If configuration information is provided to indicate service-RAT correspondence, then the ease of operation is improved, but the loss of information increases due to additional configuration overhead
Solution Approach 1:
The patent extracts only the essential information needed for RAT selection (service identifier to RAT mapping) from the complete set of possible configuration parameters. By taking out only the critical mapping relationships rather than configuring all possible transmission parameters, the system improves ease of operation with minimal configuration overhead, avoiding information loss by including only what is necessary for the RAT determination function
Data Source
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AI summary
Provided by the embodiments of the present application are a wireless communication method, a terminal device and a network device. In a D2D communication system, a terminal device can determine a RAT for transmitting data, thereby ensuring reliable transmission of data. The method is applied to terminal-to-terminal communication, and the method comprises: a terminal device determines, according to configuration information, a RAT that transmits a first service; the configuration information indicates a correspondence between at least one service and at least one RAT, and the first service belongs to the at least one service.