Antenna Switching Method for Wireless Devices
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Solution Overview
Problem
Existing electronic devices with multiple antennas face challenges in rapidly and accurately switching transmitting antennas due to varying receive sensitivity caused by antenna position, interference, and network environment, leading to issues like call drops and improper antenna selection.
Innovation Solution
An antenna switching method that measures transmit power variation based on both transmit power control and uplink scheduling information, monitors signal characteristics, and switches antennas when the transmit power variation exceeds a threshold, ensuring reliable communication by comparing signal characteristics and feedback from the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antenna switching is performed by measuring signal strength for a predetermined time, then measurement accuracy is improved, but switching speed deteriorates and call drops occur when signal state deteriorates faster than measurement time
Solution Approach 1:
The system performs preliminary measurements of signal characteristics (RSSI, RSRP, RSRQ) and stores them as baseline data before actual antenna switching is needed. When switching is required, the pre-measured data is immediately compared with current signal conditions, eliminating the need for time-consuming measurements at the moment of switching decision.
Solution Approach 2:
The system continuously monitors signal characteristics and provides feedback to the antenna switching controller. This feedback mechanism allows the system to detect signal deterioration in real-time and trigger antenna switching based on predefined thresholds, rather than waiting for periodic measurements to complete.
2Extent of automation
If antenna switching is performed based on signal strength measurement, then antenna selection is automated, but reliability deteriorates due to mismatch between reception and transmission ends and improper switching
Solution Approach 1:
The system incorporates feedback from the base station regarding transmission quality and signal characteristics. This feedback is used to verify whether the selected transmitting antenna is actually providing optimal performance, allowing the system to correct improper switching decisions and prevent mismatches between reception and transmission ends.
Solution Approach 2:
The system measures multiple signal characteristics (RSSI, RSRP, RSRQ) beyond the minimum required for basic antenna selection. By gathering excessive measurement data, the system ensures more reliable decision-making and reduces the risk of improper switching, even though this increases the complexity of the measurement process.
3Reliability
If multiple antennas are used for receiving signals, then receive sensitivity is improved, but device complexity increases due to additional antenna switching control
Solution Approach 1:
The antenna switching controller is designed to perform multiple functions: it manages both receiving antenna selection and transmitting antenna switching, monitors various signal characteristics, and coordinates with the base station for feedback. This multi-functional design consolidates complexity into a single controller rather than requiring separate control mechanisms for each antenna function.
Data Source
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AI summary
An antenna switching method of an electronic device is provided. The antenna switching method includes measuring a transmit power variation of a first antenna, monitoring characteristics of received signals of both the first antenna and a second antenna, determining a comparison result by comparing the characteristics of the received signals of both the first antenna and the second antenna when the transmit power variation is greater than or equal to a threshold value, and switching a transmitting antenna based on at least the comparison result.