Wireless Phone Location Using Uplink Bandwidth Isolation
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Solution Overview
Problem
Existing mobile communication terminal location tracking systems on TDD networks face challenges in isolating uplink and downlink bandwidths, leading to interference and inefficiencies in determining geographical locations.
Innovation Solution
A system and method that reconfigures the uplink and downlink bandwidths by isolating the uplink bandwidth from the downlink bandwidth in a TDD network, using an interrogation device to imitate a base station and employing a power detection device to measure RF signal power, allowing for precise location estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the original bandwidth is used for both uplink and downlink communication in a TDD network, then communication capacity is maintained, but interference occurs between uplink and downlink signals making location tracking difficult
Solution Approach 1:
The original bandwidth is segmented into separate uplink and downlink frequency ranges. The downlink bandwidth is removed from the end of the original bandwidth, and a narrowed downlink bandwidth is created. The uplink bandwidth is calculated to be less than the removed downlink bandwidth, creating distinct frequency segments for uplink and downlink communications, thereby eliminating interference between them.
Solution Approach 2:
The downlink bandwidth is extracted or removed from the end of the original bandwidth to create a narrowed downlink bandwidth. This extracted bandwidth is then used to calculate the uplink bandwidth, effectively separating the uplink and downlink frequency ranges and eliminating the harmful interference between them.
2Measurement precision
If bandwidth filtering is applied to measure only the calculated uplink bandwidth, then location measurement precision is improved, but device complexity increases
Solution Approach 1:
The PDD is configured with a bandwidth filter set to measure only the calculated uplink bandwidth frequency range. By changing the measurement parameter to focus exclusively on the uplink bandwidth rather than the entire original bandwidth, location measurement precision is improved while the filtering complexity is managed through parameter configuration.
3Reliability
If the downlink bandwidth is removed from the original bandwidth to create a narrowed downlink bandwidth, then uplink signal isolation is improved, but communication bandwidth capacity is reduced
Solution Approach 1:
The system dynamically reconfigures the bandwidth allocation by removing the downlink bandwidth from the end of the original bandwidth and assigning a calculated uplink bandwidth. This dynamic bandwidth management ensures reliable uplink signal isolation while optimizing the use of available frequency resources for location tracking purposes.
Data Source
AI summary
A system for locating a mobile communication terminal, the system having an interrogation device, which is configured to solicit a mobile communication terminal of a wireless communication network to establish temporary communication with the interrogation device in an original bandwidth employed for communication between the interrogation device and the mobile communication terminal. Processors configured to isolate the uplink bandwidth of the mobile communication terminal by: configuring the interrogation device to remove a downlink bandwidth, to the wireless communication terminal, from an end of the original bandwidth to create a new downlink bandwidth; calculating an uplink bandwidth at the end of the original bandwidth to be less than the bandwidth removed from the downlink bandwidth; and reconfigure the mobile communication terminal to uplink to the interrogation device on the calculated uplink bandwidth at the end of the original bandwidth. The system further comprising a power detection device (PDD) configured to measure a power of a radio frequency (RF) signal emitted by the mobile communication terminal and having bandwidth filter configured to measure less than a calculated uplink bandwidth and locate the mobile communication terminal.