RSSI Measurement Accuracy in Unlicensed Frequency Selection
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Solution Overview
Problem
The challenge is to improve the accuracy of Received Signal Strength Indicator (RSSI) values used by base stations to select idle unlicensed frequencies for communication, as current methods may fail to detect signals from hidden base stations, leading to interference.
Innovation Solution
A signal processing method where user equipment obtains configuration information including a statistical window and measurement periodicity, samples the signal on an unlicensed frequency, determines RSSI values, calculates statistical results, and reports these results to the base station, thereby enhancing the accuracy of RSSI values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the base station detects RSSI value using traditional methods, then the detection process is simple, but the detection precision is insufficient due to hidden base stations
Solution Approach 1:
The patent introduces user equipment as an intermediary to perform RSSI detection on unlicensed frequencies. The user equipment measures the RSSI values and reports them to the base station, enabling the base station to obtain accurate RSSI information from locations (near hidden base stations) where the base station itself cannot directly measure. This resolves the contradiction by using an intermediary agent to gather measurement data that would otherwise be inaccessible.
Solution Approach 2:
The patent implements a feedback mechanism where user equipment continuously monitors and reports RSSI values on unlicensed frequencies to the base station. The base station uses this feedback information to make informed decisions about frequency selection and resource allocation. This feedback loop enables the system to adapt to changing interference conditions while maintaining accurate RSSI measurements despite the presence of hidden base stations.
2Reliability
If the base station selects unlicensed frequency based on limited RSSI detection, then the frequency selection process is fast, but the reliability of frequency selection is low due to interference from hidden base stations
Solution Approach 1:
The patent employs preliminary action by having user equipment continuously monitor and report RSSI values on candidate unlicensed frequencies before the base station makes a frequency selection decision. This advance measurement and reporting allows the base station to receive pre-processed, reliable RSSI information for multiple candidate frequencies, enabling faster and more reliable frequency selection without requiring extensive real-time measurements during the decision-making process.
3Measurement precision
If user equipment samples signal continuously to improve RSSI accuracy, then the measurement precision improves, but the energy consumption increases
Solution Approach 1:
The patent implements periodic action by configuring the user equipment to sample and measure RSSI values at specific periodic intervals rather than continuously. The base station can configure the measurement periodicity and statistical window parameters to balance measurement accuracy with energy consumption. This periodic sampling approach maintains adequate measurement precision while significantly reducing the energy consumption compared to continuous monitoring.
Data Source
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AI summary
A signal processing method and a related device are disclosed. In the signal processing method, user equipment may obtain configuration information used to detect a received signal strength indicator RSSI value of a signal on an unlicensed frequency, where the configuration information includes sampling parameter information and at least one statistical window that correspond to the signal on the unlicensed frequency, and the sampling parameter information includes a sampling interval; the user equipment samples the signal on the unlicensed frequency at the sampling interval, and obtains RSSI values of the signal on the unlicensed frequency at sampling moments; the user equipment determins statistics on RSSI values of the signal on the unlicensed frequency at sampling moments included in the at least one statistical window, and obtains an RSSI value statistical result of the signal on the unlicensed frequency; and the user equipment reports the RSSI value statistical result of the signal on the unlicensed frequency to a base station. This application can improve accuracy of an RSSI value according to which the base station serving the user equipment selects an idle unlicensed frequency.