V2X Message Control via Channel Busy Ratio
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Solution Overview
Problem
In Cooperative Intelligent Transport Systems (C-ITS) using Vehicle to Everything Communication (V2X), maintaining a consistent Quality of Service (QoS) is crucial for ensuring safety, but existing methods struggle to effectively control network loads and mitigate changes to QoS.
Innovation Solution
A method is introduced where user equipment (UE) devices determine a channel busy ratio (CBR) of network channels and adjust the generation and transmission of V2X messages based on this metric. If the CBR is high, message transmission may be deferred or the message size reduced to avoid congestion, while a low CBR allows for enhanced message content and repetition for improved safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If V2X messages are transmitted frequently to ensure safety and reliable communication, then QoS and safety are improved, but network congestion increases and channel load increases
Solution Approach 1:
The patent implements dynamic adaptation of V2X message transmission parameters based on real-time channel load conditions. The channel busy ratio (CBR) is continuously measured, and transmission behavior is dynamically adjusted: when CBR is low, messages are transmitted frequently with normal size; when CBR is high, transmission is reduced or messages are compressed. This dynamic adjustment resolves the contradiction by making the system responsive to network conditions rather than static.
Solution Approach 2:
The patent employs feedback mechanisms where the transmitting UE measures the channel busy ratio and uses this information to adjust its transmission behavior. The CBR measurement provides feedback about network congestion levels, which then influences subsequent transmission decisions. This closed-loop feedback system allows the network to self-regulate and maintain QoS while avoiding congestion.
2Reliability
If message transmission frequency is increased to maintain safety, then communication reliability is improved, but channel load increases
Solution Approach 1:
The patent changes transmission parameters such as message size, transmission frequency, and timing based on channel load conditions. When the channel is congested (high CBR), the system reduces transmission frequency and/or compresses message size. When the channel is clear (low CBR), normal transmission patterns are resumed. This parameter adaptation allows the system to maintain communication reliability when needed while reducing channel load during congested periods.
3Speed
If V2X communication uses high frequency bands (mmWave) to achieve higher data rates, then transmission distance and data rate are improved, but propagation loss increases
Solution Approach 1:
The patent applies dynamic transmission power adjustment based on channel load measurements. When CBR indicates high congestion, the system reduces transmission power to avoid causing additional interference and propagation loss. When the channel is clear, higher transmission power can be used to achieve the benefits of mmWave communication. This dynamic power control allows the system to exploit high data rates when conditions permit while minimizing propagation loss impacts during congested periods.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services.A method of controlling a network, for example a peer-to-peer network, comprising a set of user equipment, UE, devices, including a first UE, is described. The method comprises determining, for example by the first UE, a first channel load metric, for example a channel busy ratio, CBR, of a set of channel load metrics of a first channel of a set of channels of the network; generating, by the first UE, a first message, for example a V2X message, of a set of messages according to the determined first channel load metric; and transmitting, by the first UE, the generated first message, optionally on the first channel. A network and a UE are also described.