Wireless Cluster Head Signal Transmission for VRU Safety
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Solution Overview
Problem
In wireless communication systems, especially in environments where Vulnerable Road Users (VRUs) are concentrated, the excessive increase in signal overhead and interference limit the effective transmission of safety-related messages, leading to potential safety risks for VRUs.
Innovation Solution
A method for transmitting signals in a wireless communication system, where a first user equipment (UE) monitors mobility messages, requests to join a cluster with a second UE, acknowledges the joining, and transmits mobility messages about the cluster, with the second UE selected based on mobility comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all VRU UEs transmit safety-related messages continuously, then the safety information coverage is improved, but the signal overhead and radio resource consumption excessively increase
Solution Approach 1:
Multiple VRU UEs are merged into a single cluster represented by one cluster head UE. The cluster head transmits safety-related messages on behalf of all cluster members, combining multiple transmission sources into one. This reduces signal overhead while maintaining safety information coverage, as surrounding vehicles receive consolidated safety information from the cluster.
Solution Approach 2:
The cluster head UE performs multiple functions: it represents the entire cluster for safety message transmission, monitors mobility messages from surrounding vehicles, manages cluster membership, and transmits cluster mobility information. This multi-functionality allows one UE to handle tasks that would otherwise require multiple UEs, reducing overall signal overhead.
2Measurement precision
If all VRU UEs transmit safety-related messages to update cluster information, then the cluster information accuracy is improved, but the transmission frequency and power consumption excessively increase
Solution Approach 1:
The transmission function is extracted from all VRU UEs and concentrated in the cluster head UE. Only the cluster head transmits safety-related messages and cluster mobility information, while other cluster members refrain from transmission. This extraction reduces power consumption while maintaining cluster information accuracy through the centralized transmission role.
Solution Approach 2:
The cluster head transmits mobility information about the cluster periodically or when mobility conditions change, rather than continuous transmission by all members. This periodic action from a single UE reduces power consumption while keeping cluster information updated and accurate for surrounding vehicles.
3Productivity
If VRU UEs form clusters to reduce transmission overhead, then the radio resource efficiency is improved, but the complexity of cluster management and mobility coordination increases
Solution Approach 1:
Cluster management functions are segmented and assigned specifically to the cluster head UE. The cluster head handles mobility message reception, cluster membership management, and mobility information transmission, while other members simply monitor and transmit only when joining or leaving the cluster. This segmentation reduces overall system complexity by centralizing management tasks.
Solution Approach 2:
The cluster head acts as an intermediary between the cluster members and surrounding vehicles. It receives mobility messages from surrounding vehicles, processes cluster membership changes, and transmits cluster mobility information to surrounding vehicles. This intermediary role simplifies communication protocols and reduces the complexity each individual UE must handle.
4Quantity of substance
If the cluster head transmits mobility information representing the entire cluster, then the signal overhead is reduced, but the reliability of individual VRU message transmission may be compromised
Solution Approach 1:
Individual VRU safety messages are merged into a single cluster-level safety message transmitted by the cluster head. The cluster head consolidates safety information from all cluster members and transmits it representatively. This merging reduces signal overhead while maintaining reliability, as the cluster head ensures comprehensive safety information is transmitted for the entire group.
Data Source
AI summary
A method by which a first user terminal transmits a signal in a wireless communication system is disclosed. The method can comprise: monitoring a message related to the mobility of one or more user terminals; transmitting, to a second user terminal selected from among the one or more user terminals, a message for requesting to join a cluster to which the first user terminal belongs; receiving, from the second user terminal, a message for acknowledging joining of the cluster; and transmitting a message related to the mobility of the cluster. In addition, the second user terminal can be selected on the basis of comparison between the mobility of the cluster and the mobility of the second user terminal.