Adaptive Rate Control for Cellular Vehicular Networks
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Solution Overview
Problem
Vehicular communication in cellular-based networks faces challenges with network congestion and high latency, which are conflicting requirements that existing technologies struggle to address effectively, especially in 3G/UMTS and 4G/LTE networks.
Innovation Solution
A method involving a centralized control entity that measures packet transmission characteristics and adjusts the packet transmission rate recursively to determine an optimal rate, coordinating with vehicles to minimize network congestion and ensure freshness of information, using a feedback-based scheme that considers different rates for uplink and downlink transmissions and incorporates coarse and fine estimation for accurate rate adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If vehicles transmit beacon messages at a high rate to maintain information freshness, then the latency of message passing is reduced, but network congestion occurs
Solution Approach 1:
The patent implements dynamic rate adjustment where the transmission rate of beacon messages is continuously adapted based on current network conditions. The system transitions from static periodic transmission to dynamic rate control, adjusting the transmission frequency according to measured network parameters such as latency and congestion levels, thereby resolving the contradiction between maintaining information freshness and avoiding network congestion
Solution Approach 2:
The patent employs a feedback mechanism where network performance parameters (latency, congestion) are measured and used to adjust the beacon message transmission rate. This closed-loop control system continuously monitors network conditions and modifies transmission rates accordingly, allowing the system to automatically balance information freshness requirements against network congestion prevention
2Quantity of substance
If a centralized control entity coordinates packet transmissions to reduce congestion, then network traffic volume is controlled, but device complexity increases
Solution Approach 1:
The patent introduces a centralized control entity that acts as an intermediary between vehicles and the network infrastructure. This control entity coordinates packet transmissions by collecting information from vehicles, determining optimal transmission rates, and distributing coordination information back to vehicles. The intermediary manages the complexity centrally rather than distributing it across multiple nodes, thereby controlling overall network traffic volume while containing device complexity within a single coordination point
Data Source
AI summary
A method for supporting vehicular communication in a cellular-based communication system includes connecting at least one base station and a plurality of vehicles equipped with mobile communication devices. A centralized control entity coordinates packet transmissions of the vehicles. Adjustment of a packet transmission rate is done recursively, where parameters of packet transmission characteristics are measured and the control entity determines, based on the parameters of packet transmission characteristics, an optimal packet transmission rate. The vehicles and/or the control entity transmit packets use the optimal packet transmission rate.