V2X Resource Exclusion Using Terminal Location Data
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Solution Overview
Problem
In LTE V2X communication, especially in user selection mode, resource collisions occur due to inaccurate exclusion of resources occupied by other V2X terminal devices, leading to high collision probabilities, as relying on RSRP values is not always reliable due to factors like power control and mobility.
Innovation Solution
The method involves determining unavailable time-frequency resources based on location information of terminal devices, rather than solely relying on RSRP values, to improve exclusion accuracy and reduce resource collisions by directly screening resources based on distance, thereby enhancing resource selection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If RSRP values are used to exclude resources occupied by other V2X terminal devices, then the exclusion process is simple, but the exclusion accuracy is low leading to high resource collision probability
Solution Approach 1:
The patent changes the parameter used for resource exclusion from RSRP (signal strength) to location information (distance). By using distance-based exclusion with threshold comparison, the system achieves more accurate resource exclusion while maintaining operational simplicity. The location information directly reflects spatial separation between terminal devices, providing a more reliable indicator for resource collision risk.
2Measurement precision
If location information is used to determine unavailable resources, then exclusion accuracy improves, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by having terminal devices acquire and store location information in advance before resource selection. The location information is obtained beforehand through positioning systems, and then used during the resource exclusion phase. This pre-acquisition of location data simplifies the actual resource selection process while maintaining high exclusion accuracy, as the distance calculation and threshold comparison are straightforward operations.
3Ease of manufacture
If RSRP measurement is used for resource exclusion, then the method is easy to implement, but reliability is low due to power control and mobility factors
Solution Approach 1:
The patent substitutes the signal-strength-based mechanism (RSRP measurement) with a geometry-based mechanism (location information and distance calculation). RSRP measurements are susceptible to power control variations and mobility effects, whereas location-based distance calculation provides a more stable and reliable indicator of spatial separation. The threshold comparison based on distance directly reflects whether terminal devices are close enough to cause resource collisions, independent of transmission power or mobility state.
Data Source
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AI summary
This application relates to a communications method and apparatus, and may be applied to an internet of vehicles, for example, V2X, LTE-V, and V2V. The method includes: A first terminal apparatus determines, a first resource pool. The first terminal apparatus detects control information of a second terminal apparatus, where the control information is used to indicate second service data of the second terminal apparatus, and the control information includes location information of the second terminal apparatus, a first frequency domain resource, and a periodicity of the second service data. The first terminal apparatus determines an unavailable time-frequency resource in the first resource pool based on location information of the first terminal apparatus, the location information of the second terminal apparatus, a first threshold, the first frequency domain resource, and the periodicity of the second service data. The first terminal apparatus selects a first time-frequency resource from available time-frequency resources in the first resource pool to transmit first service data. The first terminal apparatus sends the first service data on the first time-frequency resource. The unavailable time-frequency resource is excluded based on locations of the terminal apparatuses, to reduce a resource collision probability.