Ethernet AVB Data Transmission with Guaranteed Time
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Solution Overview
Problem
The Ethernet AVB standard for communication networks in motor vehicles has a slow start-up time for data transport with guaranteed quality of service, which is problematic for real-time-critical data and data transmission when the network is initialized, as it requires resource reservation requests that can lead to delays and potential rejection.
Innovation Solution
A method where data packets are transmitted without guaranteed transmission time initially, and a reservation request is sent later, allowing immediate data stream transmission without waiting for confirmation, with subsequent redeclaration of data packets to ensure guaranteed transmission time, mimicking the faster response times of FlexRay and MOST networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resource reservation requests are sent before data transmission in an Ethernet AVB network, then quality of service is guaranteed, but start-up time increases significantly
Solution Approach 1:
The patent applies preliminary action by pre-configuring quality of service parameters and reservation requests during network initialization or before actual data transmission is needed. This allows the network to have resources pre-allocated and ready, eliminating the need to wait for reservation confirmation during critical start-up phases while maintaining QoS guarantees.
Solution Approach 2:
The patent implements dynamics by allowing the network to switch between different transmission modes - using guaranteed QoS transmission for non-critical data and best-effort transmission for time-critical start-up data. The system dynamically adjusts resource allocation and transmission priorities based on the specific needs of different data streams and network conditions.
2Loss of time
If reservation requests are sent for all data streams, then transmission time is guaranteed, but network configuration complexity increases
Solution Approach 1:
The patent applies local quality by providing different levels of service guarantees to different data streams based on their specific requirements. Time-critical start-up data receives best-effort immediate transmission without full reservation overhead, while other data streams receive appropriate QoS guarantees. This localized differentiation reduces overall configuration complexity while maintaining necessary guarantees where needed.
Solution Approach 2:
The patent changes parameters by introducing dynamic priority levels and transmission modes that can be adjusted without reconfiguring the entire network. By modifying transmission parameters such as priority queues and buffer management rather than fundamental network topology or protocol settings, the system reduces configuration complexity while maintaining transmission time guarantees.
3Reliability
If the network waits for reservation request confirmation before transmitting data, then resource allocation is ensured, but real-time critical data transmission is delayed
Solution Approach 1:
The patent applies preliminary action by pre-allocating buffer resources and establishing transmission paths before time-critical data arrives. The network performs preliminary resource reservation for anticipated start-up data flows, so when the data actually needs to be transmitted, the path is already prepared and resources are immediately available, eliminating waiting time while ensuring resource allocation.
Solution Approach 2:
The patent implements skipping by allowing time-critical start-up data to bypass the normal reservation confirmation waiting process. The system rushes through the transmission of such data using best-effort mechanisms immediately, accepting that resource allocation may be less formalized, while still maintaining overall network stability and allocating resources afterward to catch up on any gaps.
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 and to a user terminal configured for carrying out said method. In said method, data packets can be transmitted without a guaranteed transmission time for the data packets (8) and with a guaranteed maximum transmission time for the data packets (7) in said communications network (1). For a data transmission (6) with a guaranteed transmission time, a specific quality of service is reserved prior to the data transmission (6) by means of a reservation request (4) from the sender of the data to the receiver (2, L) of the data and the data transmission with a guaranteed transmission time is only started once a confirmation (5) of the reservation request (4) sent by the sender (2, T) has been received. In addition, selected data that is to be transmitted in a guaranteed transmission time is sent directly as a data stream (6) of data packets (8) and a reservation request (4) is sent after the start of the data stream (6).