Sidelink Reference Signal Integration for Lower V2X Resource Overhead
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Solution Overview
Problem
The efficiency and reliability of sidelink reference signal transmission in vehicle-to-everything (V2X) communication are low, leading to adverse user experiences due to high resource overheads and inflexible signaling.
Innovation Solution
The sidelink reference signal is transmitted or received together with sidelink control information and data on the same time-frequency resource, eliminating the need for additional resources and allowing flexible and accurate channel status determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sidelink reference signal is sent by the network device on dedicated resources, then the reference signal can be transmitted with guaranteed resources, but the resource overhead increases and transmission efficiency decreases
Solution Approach 1:
The patent combines the sidelink reference signal with sidelink control information or data and transmits them together on the same time-frequency resources. This merging eliminates the need for separate dedicated reference signal resources, thereby reducing resource overhead while maintaining reliable transmission through the combined signal structure
Solution Approach 2:
The time-frequency resources originally designated for control information or data are made multi-functional by also carrying the sidelink reference signal. This universal usage of resources allows the same resources to serve multiple purposes (control/data transmission and channel state measurement), reducing overall resource consumption while ensuring reference signal availability
2Measurement precision
If the sidelink reference signal uses separate time-frequency resources, then the channel status measurement can be performed independently, but the signaling complexity and resource configuration overhead increase
Solution Approach 1:
The patent merges the reference signal transmission with control information or data transmission by placing them on the same time-frequency resources. This combination simplifies the signaling architecture by eliminating separate reference signal configuration procedures while maintaining the ability to perform accurate channel status measurements through the integrated signal structure
3Reliability
If dedicated resources are allocated for sidelink reference signal, then the reference signal transmission is guaranteed, but the flexibility of resource allocation is reduced
Solution Approach 1:
The patent creates multi-functional resources that can dynamically serve as control channels, data channels, or reference signal carriers depending on transmission needs. This universal resource allocation approach provides both transmission guarantees (through proper resource assignment) and high flexibility (through adaptive resource usage), allowing the system to adjust resource allocation based on varying channel conditions and traffic requirements
Data Source
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AI summary
This application provides a sidelink reference signal transmission method and a communication apparatus, which may be applied to an internet of vehicles, for example, V2X, LTE-V, and V2V. A first terminal device obtains a first time-frequency resource, where the first time-frequency resource is used to send sidelink control information and data. The first terminal device sends, on the first time-frequency resource, a sidelink reference signal, the sidelink control information, and the data to a second terminal device, where the sidelink reference signal is used to determine a channel status of a sidelink between the first terminal device and the second terminal device. According to the sidelink reference signal transmission method provided in this application, the sidelink reference signal is carried on the time-frequency resource used to send the sidelink control information and/or the data, and is sent together with the sidelink control information and/or the data. The sidelink reference signal can be flexibly and accurately sent in SL communication, thereby improving flexibility and reliability of sending the sidelink reference signal on the sidelink, and reducing resource overheads of the sidelink reference signal.