DECT Antenna Selection for Shadow Zone Mitigation
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Solution Overview
Problem
Radiofrequency wave communication systems where terminals are carried by moving supports, such as people or vehicles, face challenges in maintaining stable transmission quality due to antenna masking by the support, creating shadow zones that can lead to attenuated beacon signals and interrupted communication.
Innovation Solution
Implementing an antenna selection mechanism that actively chooses the best antenna for receiving and transmitting signals during synchronization and communication establishment, ensuring optimal signal quality by considering each antenna in turn and selecting the one with the highest power level, and preferably using the most disengaged antenna for beacon signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple antennas are used to overcome signal attenuation and improve reception quality, then communication reliability is improved, but device complexity increases due to the need for antenna selection mechanisms and power level comparison
Solution Approach 1:
The terminal automatically performs antenna selection by measuring power levels of signals received by multiple antennas and autonomously choosing the optimal antenna without external intervention. The antenna selection mechanism operates self-service by comparing power levels and selecting the best antenna for communication.
Solution Approach 2:
The system changes the parameter of antenna selection based on measured power levels. By monitoring and comparing power level parameters across multiple antennas, the system dynamically selects the antenna with the highest power level to maintain optimal communication quality.
2Reliability
If antenna diversity mechanism is implemented to overcome multiple paths and reflections, then signal quality is improved, but the system requires additional means for measuring power levels and selecting antennas
Solution Approach 1:
The terminal performs automatic antenna selection by measuring power levels and choosing the optimal antenna autonomously during communication establishment and maintenance, eliminating the need for manual configuration or external control.
Solution Approach 2:
The system performs preliminary antenna selection during the communication establishment phase by measuring power levels of multiple antennas before actual data transmission begins, ensuring the best antenna is selected in advance to avoid interruptions.
3Stability of the object's composition
If the terminal continuously monitors and selects optimal antennas during communication, then communication stability is improved, but processing time and energy consumption increase
Solution Approach 1:
The antenna selection is performed preliminarily during the communication establishment phase rather than continuously during data transmission. This preliminary selection ensures stability is established early, reducing the need for ongoing processing and minimizing time loss during actual communication.
Solution Approach 2:
The system performs antenna monitoring and selection periodically at key moments (during establishment and when quality degradation is detected) rather than continuously, balancing communication stability with processing time efficiency.
Data Source
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AI summary
The terminal has a measuring unit for measuring a power level of a signal received by antennas. A selecting unit selects one of the antennas by comparing the measured power level, where the selected antenna is used for emitting a signal. The antennas are positioned on parts e.g. body, of a support e.g. person or vehicle, so that a shadow region of the antenna is covered by another antenna. An independent claim is also included for a method for managing a beacon signal or radio frequency communication traffic signals established between a master terminal and a slave terminal.