Wireless Communication Apparatus Propagation Delay Physical Layer Selection
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Solution Overview
Problem
In Bluetooth Low Energy (BLE) communication systems, large propagation delays due to increased communication distances can lead to signal quality deterioration and connection loss when updating to physical layers with lower error tolerance, as existing methods lack effective means to assess and manage propagation delays.
Innovation Solution
A wireless communication apparatus that measures propagation delay by detecting synchronization codes and calculates the round-trip distance, using this information to determine whether to update the physical layer, thereby preventing updates to layers with lower error tolerance when propagation delays exceed a reference value, ensuring stable connections over long distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the communication distance is increased, then the coverage area is expanded, but the propagation delay increases causing connection loss
Solution Approach 1:
The system dynamically adjusts the physical layer configuration based on real-time propagation delay measurements. When propagation delay exceeds a threshold, the system automatically switches to a more robust physical layer with higher error tolerance, ensuring connection stability while maintaining extended coverage capability.
Solution Approach 2:
The invention changes the error tolerance parameter of the physical layer based on propagation delay conditions. By measuring propagation delay and comparing it against thresholds, the system selects appropriate physical layer parameters (error correction levels, coding schemes) to maintain reliable communication over extended distances.
2Productivity
If a physical layer with lower error tolerance is selected, then the data rate is improved, but connection loss occurs when propagation delay is large
Solution Approach 1:
The system implements dynamic physical layer selection that adapts to propagation delay conditions. When propagation delay is within acceptable thresholds, the system uses high-data-rate physical layers. When propagation delay exceeds thresholds, it dynamically switches to more robust physical layers with higher error tolerance, preventing connection loss while maximizing data rate when conditions permit.
Solution Approach 2:
The invention changes physical layer parameters including error correction levels and coding schemes based on measured propagation delay. This allows the system to optimize the trade-off between data rate and connection stability by selecting appropriate parameter configurations matching the current communication conditions.
3Productivity
If the physical layer is updated without considering propagation delay, then the communication efficiency is improved, but connection loss occurs at long distances
Solution Approach 1:
The system performs preliminary measurement of propagation delay before updating or selecting a physical layer. By measuring propagation delay in advance and comparing it against predefined thresholds, the system determines whether the current physical layer configuration is appropriate for the communication distance, preventing connection loss before it occurs.
Solution Approach 2:
The invention implements a feedback mechanism where propagation delay measurements continuously inform physical layer selection decisions. The system measures propagation delay, compares it against thresholds, and uses this feedback to determine whether to maintain or update the current physical layer configuration, ensuring communication efficiency while preventing connection loss.
Data Source
AI summary
A wireless communication apparatus includes a transmission/reception unit, a measurement unit, a physical layer, an acquisition unit, and a control unit. The transmission/reception unit transmits/receives packets to/from a communication peer. The measurement unit starts measuring a time period after a predetermined time from an end of the packet transmitted to the communication peer. The physical layer detects a synchronization code included in the packet transmitted from the communication peer and generates a synchronization detection signal. The acquisition unit acquires a measured value by the measurement unit when receiving the synchronization detection signal. The control unit has a function to change the physical layer to a physical layer with a different error tolerance, and calculates a propagation delay by subtracting a length of a synchronization code from the measured value and judges whether to update the physical layer or not depending on the propagation delay.