WLAN Data Flow Control for VoIP Impairment via Periodic Rate Reduction
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Solution Overview
Problem
WLAN radio links struggle to maintain the Quality of Service (QoS) required for Voice over Internet Protocol (VoIP) applications, leading to potential degradation of synchronous data traffic and increased costs for users, as existing methods cannot effectively restrict unauthorized VoIP traffic without impacting asynchronous data transmission.
Innovation Solution
A method to control data flow on WLAN radio links by reducing the data rate at specific time intervals, which can be implemented in the WLAN base station without modifying the mobile station, by delaying data processing in a FIFO buffer store, thereby selectively degrading VoIP quality for unauthorized users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data rate is reduced at time intervals to restrict synchronous data traffic, then VoIP quality for unauthorized users is degraded, but asynchronous data transmission quality is maintained
Solution Approach 1:
The patent applies periodic action by reducing the data rate at specific time intervals rather than continuously. The WLAN base station delays data processing in a FIFO buffer store at periodic intervals, which selectively degrades synchronous data traffic (VoIP) while maintaining asynchronous data transmission. This periodic intervention allows the system to impair VoIP quality for unauthorized users without completely blocking data transmission.
Solution Approach 2:
The patent implements dynamics by making the data rate variable rather than fixed. The data rate is dynamically adjusted at specific time intervals based on the need to restrict synchronous data traffic. This dynamic control allows the system to adapt the data rate according to traffic type, ensuring that VoIP quality is degraded when needed while asynchronous traffic continues unaffected.
2Reliability
If data rate is continuously reduced to prevent unauthorized VoIP, then all data transmission is impaired, but selective restriction of synchronous traffic is needed
Solution Approach 1:
The patent applies local quality by treating different types of data traffic differently. Instead of uniformly reducing data rate for all traffic, the system selectively applies data rate reduction only to synchronous data traffic (VoIP) while leaving asynchronous data transmission unaffected. This is achieved through the FIFO buffer store which can selectively delay packets based on their traffic characteristics, thereby maintaining local quality differentiation.
Solution Approach 2:
The patent segments data traffic into synchronous (VoIP) and asynchronous categories, applying different quality control measures to each segment. The FIFO buffer store enables this segmentation by allowing selective delay of synchronous traffic packets while permitting asynchronous traffic to pass through at normal data rates. This segmentation approach allows independent control of quality parameters for different traffic types.
Data Source
AI summary
In a method for controlling the data flow on a radio link between a WLAN base station and a WLAN mobile station, the data rate on the radio link is reduced for in each case one time period (36, 37) at time intervals (35). One preferred field of application for the method is to restrict general or unauthorized transmission of a telephone call via the Internet.