Data Link Control via Priority-Based Channel Capacity Assessment
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Solution Overview
Problem
In networks with multiple stations, the increasing number of transmitting stations reduces the available capacity for each station, leading to a decrease in the ability to maintain quality of service parameters for time-critical services like voice or video streaming, as all stations with the same priority have equal access to the transmission medium, resulting in unsatisfactory service delivery.
Innovation Solution
A method where the establishment of a new data link by a first station is restricted based on the available free channel capacity and occupancy by existing data links with similar priority, allowing higher-priority services to maintain quality by temporarily suspending new link setups if capacity is insufficient, and using a threshold to assess free channel capacity considering lower-priority traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If all stations with the same priority have equal access to the transmission medium, then the ease of operation is improved, but the quality of service for time-critical services deteriorates
Solution Approach 1:
The patent applies local quality by differentiating access rights based on priority levels. Stations are divided into priority classes (e.g., real-time vs. non-real-time services), and each class receives different access control treatment. High-priority stations can establish data links without waiting for low-priority stations, while low-priority stations must wait until high-priority stations finish transmission. This creates locally differentiated quality of service within the network.
Solution Approach 2:
The patent implements dynamics by making access rights time-dependent and adaptive. The transmission medium access control dynamically adjusts based on current network conditions and priority levels. When a high-priority station requests a data link, the system dynamically grants immediate access. When a low-priority station requests access during high-priority transmission, the system dynamically denies access or delays it until appropriate. This dynamic control maintains quality of service while managing equal access principles.
2Productivity
If the number of transmitting stations increases, then the productivity is improved, but the available capacity for each station deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the transmission medium access into priority-based segments. Instead of treating all stations equally, the system segments access rights based on service type (real-time vs. non-real-time). This allows the network to manage capacity by allocating different portions of the transmission medium to different priority classes, enabling more stations to operate simultaneously while maintaining adequate capacity for each station's intended service.
Solution Approach 2:
The patent utilizes parameter changes by modifying access control parameters based on station priority. The system changes parameters such as transmission delay, packet loss tolerance, and channel access timing according to the priority level of each station. This allows the network to scale the number of transmitting stations while maintaining adequate capacity by adjusting these parameters dynamically rather than treating all stations uniformly.
3Ease of operation
If new data links are established without regard for current utilization, then the ease of operation is improved, but the quality of service for existing links deteriorates
Solution Approach 1:
The patent applies preliminary action by requiring stations to declare their priority level and service requirements before establishing a data link. The system performs preliminary assessment of current network utilization and priority levels before granting access. This preliminary action allows the system to prevent new links from deteriorating existing service quality while maintaining simple operation for legitimate requests. Stations simply need to indicate their priority, and the system handles the capacity assessment automatically.
Solution Approach 2:
The patent implements feedback by having the transmission control unit continuously monitor network conditions and priority levels. When a new data link request arrives, the system provides feedback about current utilization status and priority-based capacity availability. This feedback mechanism allows stations to understand whether their link establishment request can be granted without compromising existing services, maintaining both ease of operation and service quality through transparent communication about network state.
Data Source
AI summary
A method for controlling the transmission of data via data connections associated with different applications, by means of a transmission medium in a local network having at least two stations for data transmission. Different priorities and different parameters characterizing a quality of service are associated with the applications. The establishment, by a first station, of a new data connection associated with a first application is limited according to the available free channel capacity of the transmission medium and the use of the transmission medium by existing data connections having associated applications containing a priority corresponding to the first application.