Cross-Layer Rate Control via Queue Stability and Predicted Transmission
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Solution Overview
Problem
Modern wireless communication systems face increasing constraints on resources and demands for quality and quantity of service, particularly in multi-point wireless environments with high data throughputs.
Innovation Solution
A cross-layer rate control method that involves a media access control (MAC) scheduler selecting a transmission rate for wireless terminals based on a queue stability metric and a predicted transmission rate, with information about the selected rate being sent to an application server.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional rate control methods are used in wireless communication systems, then the system can maintain basic connectivity, but the quality of service deteriorates in multi-point wireless environments with high data throughputs
Solution Approach 1:
The patent introduces cross-layer control by adding a new dimension to rate selection. Instead of relying solely on traditional MAC layer mechanisms, the system integrates application layer feedback (queue stability metric) with physical layer characteristics (predicted transmission rate) to make informed rate decisions, thereby improving quality of service while maintaining high throughput in multi-point wireless environments
Solution Approach 2:
The patent implements a feedback mechanism where the application layer provides information about queue stability to the MAC scheduler. This feedback loop allows the system to continuously monitor and adjust transmission rates based on actual application needs and network conditions, resolving the contradiction between maintaining quality of service and achieving high data throughput
2Reliability
If faster rate control is implemented, then the quality of service improves, but the system complexity increases
Solution Approach 1:
The patent segments the rate control function into distinct components: the MAC scheduler handles physical layer rate selection based on predicted transmission rate, while the application layer provides queue stability metrics. This segmentation allows each component to focus on specific tasks, making the overall system more manageable despite the increased functionality
Solution Approach 2:
The MAC scheduler is designed to perform multiple functions: it selects transmission rates based on predicted transmission rate, incorporates application layer feedback about queue stability, and makes final rate decisions. This multi-functionality consolidates what would otherwise be separate complex mechanisms into a single coordinated unit, improving quality of service without proportionally increasing overall system complexity
Data Source
AI summary
Aspects of this disclosure relate to methods of cross layer rate selection and related controllers and systems. A media access control scheduler can select a rate for transmitting data for a wireless terminal based on a queue stability metric and a predicted transmission rate associated with the wireless terminal. Information identifying the rate can be sent to an application server. The rate can then be used by application server to send data for the wireless terminal to an access point via an access point controller, in which the access point can wirelessly serve the wireless terminal.