Packet Network Capacity Determination via Reservation Requests
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Solution Overview
Problem
Current packet-oriented communication networks, particularly those adhering to the Ethernet AVB standard, lack the ability to determine actual latency and available data rate, leading to inefficient resource utilization and potential communication disruptions due to insufficient capacity handling.
Innovation Solution
The method involves sending periodic reservation requests to determine the current capacity of the network, even in the absence of data transmission, and using timestamped data packets to verify the available quality of service, allowing for adaptive reservation requests and optimized data stream transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reservation requests are sent periodically to determine network capacity, then measurement precision of available data rate and latency is improved, but loss of time due to additional communication overhead increases
Solution Approach 1:
The system performs capacity determination by sending reservation requests periodically before actual data transmission occurs. This preliminary measurement of network capacity (available data rate and latency) allows the sender to adapt subsequent data transmissions to current network conditions, improving measurement precision without interfering with actual data flow
Solution Approach 2:
The patent uses dummy reservation requests that do not carry actual data but serve solely for capacity measurement. These disposable measurement packets are sent periodically and discarded after serving their measurement purpose, enabling continuous network monitoring with minimal impact on actual data transmission
2Adaptability or versatility
If the sender adapts reservation requests based on determined network capacity, then adaptability to network conditions is improved, but device complexity increases
Solution Approach 1:
The system implements a feedback mechanism where the sender determines network capacity by analyzing responses to reservation requests, then uses this information to adapt subsequent reservation requests. The sender adjusts the requested data rate and latency parameters based on the measured available capacity, creating a closed-loop system that continuously adapts to changing network conditions
Solution Approach 2:
The reservation request parameters (requested data rate, requested latency) are made dynamic rather than static. The sender continuously adjusts these parameters based on periodically determined network capacity, allowing the system to adapt flexibly to varying network conditions while maintaining manageable complexity through systematic parameter adjustment
3Ease of operation
If standard rejection messages without network status information are used, then ease of operation is maintained, but loss of information about available capacity increases
Solution Approach 1:
The patent introduces an intermediary measurement process using dummy reservation requests that act as a mediator between the sender and network status. Instead of relying on incomplete rejection messages, the sender uses these intermediary probes to indirectly query network capacity by analyzing the responses (acknowledgments or rejections) to the reservation requests, thereby obtaining information that standard messages do not provide
Data Source
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AI summary
The invention relates to a method for transmitting data in a packet-oriented communications network (1), in particular of a motor vehicle, with a guaranteed maximum transmission time for the data packets (9) in said communications network (1), and to a user terminal in said communications network. In said method, a specific quality of service as a capacity of the communication link is reserved prior to a data transmission (6) by means of a reservation request (4) from the sender (2, T) of the data to the receiver (2, L) of the data and the requested quality of service as a capacity of the communication link between the sender (2, T) and the receiver (2, L) is guaranteed in the network (1) for the data stream by the confirmation (5) of the reservation request (4), or an indication is given by means of a rejection (7) that transmission is not possible. In addition, the capacity of the communications network (1) is determined cyclically prior to a reservation request (4), after a rejection (7) and/or at predefinable time intervals.