Wireless Link Quality Monitoring via Beacon Training Sequences
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Solution Overview
Problem
Current wireless network technologies, such as WiMedia, lack efficient methods for monitoring the quality of wireless links between devices, particularly in dynamic environments where environmental conditions and moving objects degrade link quality, making it difficult for transmitters to determine outgoing link conditions and specify link quality information.
Innovation Solution
The implementation of a method for continuous and on-demand monitoring of wireless link quality through a Link Quality Information Element (LQIE) and a link quality monitoring command frame, where devices measure and record link quality and broadcast this information in beacon frames or separate frames, constructing a local neighborhood link quality table to facilitate link adaptation and device selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If Link Feedback IE is transmitted by receiver to recommend data rate and transmit power level, then transmitter can optimize transmission parameters, but transmitter cannot determine conditions of outgoing links
Solution Approach 1:
Instead of relying on receiver feedback to infer transmitter conditions, the patent inverts the approach by having the transmitter directly measure outgoing link quality using training sequences and correlation techniques. This allows the transmitter to independently determine link conditions without relying on receiver measurements or feedback.
Solution Approach 2:
The patent introduces training sequences as an intermediary mechanism that enables bidirectional link quality measurement. These training sequences are embedded in beacon and data frames, allowing both transmitter and receiver to measure link quality independently and share measurements through feedback, thus resolving the information asymmetry.
2Measurement precision
If link quality is monitored continuously to capture dynamic changes, then accurate real-time link quality data is obtained, but network overhead and energy consumption increase
Solution Approach 1:
The patent implements periodic link quality monitoring where devices measure and report link quality at regular intervals defined by beacon periods and optional on-demand triggering. This periodic approach captures dynamic link quality changes while controlling energy consumption and network overhead compared to continuous monitoring.
Solution Approach 2:
The patent performs preliminary link quality measurements using training sequences embedded in beacon frames before actual data transmission. This preliminary measurement allows the system to pre-determine appropriate data rates and power levels, avoiding the need for continuous monitoring during data transmission and reducing overall energy consumption.
3Adaptability or versatility
If transmitters cannot specify link quality information in Link Feedback IE, then receiver autonomy is maintained, but complete link quality information is lost
Solution Approach 1:
The patent extends the Link Feedback IE to serve multiple functions: it continues to carry receiver-measured link quality information for receiver autonomy, while also incorporating transmitter-measured outgoing link quality information. This multi-functional extension allows the same feedback mechanism to provide complete bidirectional link quality information without compromising receiver independence.
Data Source
AI summary
A method for monitoring of a wireless link quality comprises measuring the link quality of a wireless link (120-XY) between a beacon device (110-X) transmitting a beacon and a beacon device (110-Y) receiving the beacon, wherein the measuring is performed by the receiving device (S320); saving link quality measures in a local neighborhood link quality (LNLQ) table (400) maintained by the receiving device (110-Y) (S330); and advertising the link quality measures of wireless links by transmitting the measures in beacons (S340).