PLCA Priority Transmission Allocation in Vehicle Ethernet
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Solution Overview
Problem
Current vehicle network technologies, such as CAN and FlexRay-based networks, fail to support the higher transmission rates and system expandability required by enhanced safety systems like telematics and infotainment systems, and the MOST-based network is costly, necessitating the use of Ethernet-based networks, which face challenges in managing urgent data transmission due to collisions in multi-end node scenarios.
Innovation Solution
An operation method for end nodes in an Ethernet-based vehicle network that includes monitoring for transmission requests, stopping transmission operations to allow higher-priority nodes to transmit urgently, using low power idle signals and timer values to manage transmission opportunities, and adjusting time intervals based on priority and collision detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a round-robin scheduling algorithm is used in PLCA function, then fairness is ensured for all nodes, but high-priority nodes (e.g., brake, airbag) cannot obtain transmission opportunities rapidly
Solution Approach 1:
The patent changes the scheduling parameter from fixed round-robin to dynamic priority-based allocation. Nodes transmit priority information along with data packets, and the PLCA function adjusts transmission opportunity allocation based on these priority parameters, allowing emergency nodes to jump ahead in the transmission queue.
Solution Approach 2:
The patent introduces dynamic adjustment of transmission opportunities based on real-time priority needs. Instead of static round-robin scheduling, the system dynamically reassigns time slots and transmission rights to nodes with higher priority data, making the scheduling adaptive to changing network conditions and emergency requirements.
2Speed
If Ethernet-based network is used to support high transmission rates, then system expandability and transmission rate are improved, but collision management in multi-end node scenarios becomes difficult
Solution Approach 1:
The patent introduces an intermediary PLCA function that mediates between multiple Ethernet nodes. This intermediary mechanism coordinates transmission slots and detects collisions, managing the complexity of multi-node communication while preserving the high-speed Ethernet infrastructure.
Solution Approach 2:
The patent implements feedback mechanisms where nodes monitor the network for collision signals and adjust their transmission behavior accordingly. The PLCA function uses feedback from collision detection to reassign transmission opportunities, creating a self-regulating system that manages Ethernet collisions efficiently.
3Ease of operation
If transmission opportunities are allocated equally to all nodes, then fairness is maintained, but emergency data transmission is delayed
Solution Approach 1:
The patent applies preliminary action by having nodes declare their priority levels before transmission. The PLCA function uses this pre-declared priority information to pre-allocate transmission opportunities, ensuring that when emergency data needs to be transmitted, the node is already positioned to transmit without waiting through equal-round scheduling.
Data Source
AI summary
An operation method of a first end node in a vehicle network supporting a PLCA function is provided. The method includes performing a monitoring operation in a first time interval configured for communication of the first end node and detecting a transmission request signal transmitted from a second end node by the monitoring operation. In response to detecting the transmission request signal, a transmission operation of the first end node in the first time interval is stopped. The first time interval is used for communication of a second end node instead of the first end node.