Network Arbiter Dynamic Window Adjustment for Bufferbloat
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Solution Overview
Problem
Existing data transmission systems often experience bufferbloat, high latency, and degraded performance due to an oversized advertised receive window, which leads to unnecessary buffering and bottlenecks, especially in the 'last hop' connection to the client.
Innovation Solution
A network arbiter is introduced to dynamically adjust the advertised receive window by calculating the bandwidth delay product based on round trip time and channel capacity, and applying this calculation to modulate the data transmission rate, with the ability to repeat these calculations under specific conditions such as time passage or storage saturation, and employing a Random Early Discard algorithm to manage packet dropping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the advertised receive window is increased to improve data transmission throughput, then the data flow rate increases, but the buffer size requirement increases and latency increases
Solution Approach 1:
The network arbiter dynamically adjusts the advertised receive window size based on real-time buffer status and network conditions. Instead of using a static large window, the system continuously monitors buffer occupancy and modulates the window size to match actual transmission needs, allowing throughput to adapt to available bandwidth while preventing excessive buffering that would increase latency
Solution Approach 2:
The system implements a feedback mechanism where the network arbiter monitors buffer occupancy, transmission rates, and round trip time, then uses this information to adjust the advertised receive window. This closed-loop control ensures the window size optimally balances throughput and latency by responding to actual network conditions rather than using fixed parameters
2Productivity
If the advertised receive window is increased to improve data transmission throughput, then the data flow rate increases, but the buffer size requirement increases
Solution Approach 1:
The network arbiter dynamically adjusts the advertised receive window size based on real-time buffer status and network conditions. Instead of using a static large window, the system continuously monitors buffer occupancy and modulates the window size to match actual transmission needs, allowing throughput to adapt to available bandwidth while preventing excessive buffering that would increase latency
Solution Approach 2:
The system changes the key parameter of advertised receive window size based on calculated bandwidth delay product and buffer status. By adjusting this parameter dynamically rather than using a fixed large value, the system achieves high throughput when bandwidth allows while minimizing buffer size requirements when bandwidth is limited
3Device complexity
If the advertised receive window is set to a fixed large value to simplify control, then device complexity is reduced, but data transmission efficiency deteriorates due to bufferbloat
Solution Approach 1:
The network arbiter acts as an intermediary device between the sender and receiver, managing the advertised receive window on behalf of the end systems. This intermediary handles the complexity of dynamic window adjustment, buffer monitoring, and bandwidth estimation, while the end systems can use simpler fixed window configurations. The arbiter absorbs the control complexity to achieve efficient transmission without bufferbloat
Data Source
AI summary
A network arbiter and associated method for linking and controlling the rate of data transmission between a sender on a connected network and a client with an advertised receive window are disclosed. The network arbiter comprises a downstream temporary storage for temporarily storing data in transmission from the sender to the client, an upstream temporary storage for temporarily storing data in transmission from the client to the sender and a processor operatively connected to the downstream temporary storage and the upstream temporary storage. The processor is configured to alter the advertised receive window in order to modulate the rate of data transmission.