Adaptive UWB Preamble Length Control for Distance Accuracy
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Solution Overview
Problem
In UWB networks, the fixed length of the preamble in IEEE 802.15.4 standard results in variable wireless communication performance and power consumption, being inefficient in both line of sight and non-line of sight conditions due to inaccurate distance measurement and increased latency or power consumption.
Innovation Solution
An electronic device equipped with a processor to adaptively control the preamble length based on mode information exchanged with external devices, adjusting the preamble length dynamically to optimize distance measurement accuracy and reduce power consumption and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the length of the preamble is increased, then the accuracy of distance measurement is improved, but power consumption and latency increase
Solution Approach 1:
The patent applies dynamics by making the preamble length adjustable rather than fixed. The system dynamically selects between different preamble lengths (first length and second length) based on the communication state, allowing optimization between measurement accuracy and power consumption according to actual LOS/NLOS conditions
Solution Approach 2:
The patent changes the parameter of preamble length from a fixed value to a variable parameter that can take different values (first length and second length). This parameter change enables the system to adapt to different communication scenarios, selecting appropriate preamble lengths to balance measurement accuracy with power consumption and latency requirements
2Measurement precision
If the length of the preamble is increased, then the accuracy of distance measurement is improved, but latency increases
Solution Approach 1:
The system dynamically adjusts the preamble length based on communication state (LOS or NLOS conditions). In LOS conditions where measurement accuracy is sufficient with shorter preambles, the system selects the first length to minimize latency, while in NLOS conditions it may switch to the second length to improve accuracy, thus optimizing the latency-accuracy trade-off
Solution Approach 2:
By changing the preamble length parameter from fixed to variable, the system can reduce latency in scenarios where maximum accuracy is not critical (LOS conditions), while maintaining accuracy when needed (NLOS conditions), effectively resolving the latency-accuracy contradiction
3Device complexity
If the length of the preamble is fixed, then the device complexity is reduced, but adaptability to different communication states deteriorates
Solution Approach 1:
The patent introduces dynamic adaptability by enabling the system to switch between different preamble lengths based on communication state detection. This dynamic mechanism provides versatility in handling LOS and NLOS conditions while maintaining relatively simple implementation through state-based decision logic
Solution Approach 2:
The system uses feedback from communication state detection (LOS/NLOS determination) to adjust the preamble length. This feedback mechanism enables adaptive behavior where the system learns from the communication environment and adjusts parameters accordingly, improving versatility without requiring complex autonomous decision-making
Data Source
AI summary
An electronic device for supporting an ultra wide band (UWB) protocol transmits first data, including mode information indicating whether the electronic device supports a mode associated with control of a preamble and a preamble having a first length, to an external electronic device circuit, receives second data including mode information indicating whether the external electronic device supports the mode associated with the control of the preamble from the external electronic device, and controls a length of the preamble, based on the mode information included in the second data.