V2X Broadcast Resource Allocation for Low-Latency Aperiodic Messages
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Solution Overview
Problem
Existing V2X communication systems experience high latency due to the need for regular checks of time-frequency resources for data transmission, which is detrimental to services requiring short latency, such as aperiodic message broadcasting.
Innovation Solution
A method where a base station divides a pool of time-frequency resources into subsets, allowing transmitting devices to select resources as needed, with constraints to account for bidirectional communication within the group, reducing the risk of resource collisions and enabling flexible resource selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If time-frequency resources are not selected and indicated to receiver devices, then network coverage can be extended, but receiver devices cannot efficiently receive and decode broadcast messages due to lack of resource allocation information
Solution Approach 1:
The base station performs preliminary selection of time-frequency resources and indicates them to receiver devices before broadcast message transmission. This allows receiver devices to know in advance which resources to monitor, enabling efficient message reception while maintaining extended network coverage.
2Ease of operation
If time-frequency resources are selected and indicated to all receiver devices, then message reception efficiency is improved, but network coverage is limited due to resource constraints
Solution Approach 1:
The invention segments the network coverage area into multiple coverage areas, each associated with specific time-frequency resources. Different receiver devices in different coverage areas are indicated with different resource allocations, allowing the system to serve a larger overall network area while providing efficient resource allocation to each segment.
3Reliability
If coverage enhancement is provided to receiver devices with poor reception, then message reception reliability is improved, but resource waste occurs for devices with good reception
Solution Approach 1:
The invention applies different resource allocation strategies to different receiver devices based on their specific reception conditions. Receiver devices in poor coverage areas are allocated resources for coverage enhancement, while devices in good coverage areas use normal resources, ensuring each device receives appropriate quality of service without wasting network resources.
4Device complexity
If a single coverage area is used for all receiver devices, then resource management is simplified, but receiver devices in poor coverage areas cannot achieve reliable message reception
Solution Approach 1:
The invention divides the network coverage into multiple coverage areas with different resource allocations. Each coverage area has its own time-frequency resources indicated to receiver devices within that area, allowing the system to manage complexity through structured segmentation while ensuring reliable reception for all devices regardless of their specific coverage conditions.
Data Source
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AI summary
The invention relates to the field of V2R. In order to allow the broadcast of periodic messages, the transmitter device regularly checks whether or not time-frequency resources of a radio signal are being used. When the transmitter device detects an available time-frequency resource, it selects it and uses it to broadcast its messages. The time necessary for the transmitter device to listen to all of the time-frequency resources is of the order of a second. Such a listening time is a drawback for services that require a short latency time, such as services that require the broadcast of aperiodic messages. The proposed solution allows a transmitter device to select a time-frequency resource at any time on the basis of its requirements and without having to regularly check whether or not time-frequency resources are being used to broadcast data. The latency time is thus greatly reduced thereby.