V2X Protocol Interference Mitigation via Reservation Time
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Solution Overview
Problem
Existing wireless vehicular communication systems face inefficiencies due to interference between different vehicular communication protocols operating in the same bandwidth, such as LTE-based and WiFi-based technologies, which can lead to collisions and reduced communication effectiveness.
Innovation Solution
The implementation of a method where the first vehicular communication protocol sends messages synchronously with a preamble that reserves transmission time, indicating a reservation time to the second protocol's circuitry, allowing it to suspend transmissions and preventing interference, while also monitoring channel usage to derive fairness criteria for balanced spectrum use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple vehicular communication protocols (LTE-based and WiFi-based) operate in the same bandwidth simultaneously, then communication coverage and protocol versatility are improved, but interference and collision between protocols increase
Solution Approach 1:
The patent segments the communication bandwidth by protocol type, creating separate resource pools for LTE-based V2X and WiFi-based V2X communications. This segmentation allows each protocol to operate independently within its allocated resources, preventing interference while maintaining protocol versatility. The base station configures different physical resource blocks for different protocol types, ensuring that LTE and WiFi transmissions do not collide.
Solution Approach 2:
The base station acts as an intermediary that manages and coordinates resources between LTE-based and WiFi-based vehicular communication protocols. It receives buffer status reports from both protocol types, determines appropriate resource allocations, and configures resource pools to prevent interference. This intermediary control mechanism enables multiple protocols to coexist harmoniously in the same bandwidth.
2Manufacturing precision
If synchronous message transmission is used in LTE-based V2X, then transmission timing precision is improved, but conflict with asynchronous WiFi-based V2X transmissions increases
Solution Approach 1:
The patent segments transmission resources by protocol synchronization characteristics. LTE-based synchronous transmissions are allocated specific time-frequency resources that are separated from WiFi-based asynchronous transmissions. This resource segmentation ensures that precise synchronous LTE transmissions do not collide with flexible but potentially conflicting WiFi transmissions, allowing both timing precision and protocol compatibility to coexist.
3Productivity
If dynamic resource allocation is implemented for V2X communications, then communication efficiency is improved, but complexity of resource management increases
Solution Approach 1:
The patent segments resource management by protocol type, creating separate resource pools for LTE-based and WiFi-based V2X communications. This segmentation simplifies the dynamic resource allocation process by allowing the base station to manage each protocol's resources independently based on their specific requirements and buffer status reports, reducing overall management complexity while maintaining high communication efficiency through protocol-specific optimization.
Data Source
AI summary
Embodiments are directed to methods and apparatuses for wireless vehicular communications using different communications protocols. A method includes communicating wirelessly via first vehicular communications circuitry by using a first vehicular communications protocol in which respective messages are sent synchronously. The method further includes, as part of each transmitted message, including data which is consistent with another vehicular communications protocol in which messages are sent asynchronously on behalf of other vehicular communications circuits and which indicates to the other vehicular communications circuits a reservation time for ensuing message subframes. In some embodiments, in addition to or alternatively to the above, the messages are transmitted based upon a fairness criterion associated with a relative extent of frequency-spectrum use involving transmissions according to the first vehicular communications protocol relative transmissions according to the other vehicular communications protocol.