Base Station Spectrum Sensing for Interference Control
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Solution Overview
Problem
Spectrum sharing systems face interference issues due to collective use of licensed or unlicensed spectrum, which can destroy the sharing process, necessitating effective methods to manage and determine the usage of shared spectrum to avoid such interference.
Innovation Solution
A base station and user terminal configuration with sensors, transceivers, and processors that sense and measure signals over shared spectra, allowing the base station to determine whether to utilize the spectrum based on energy thresholds and measurement reports from user terminals, enabling appropriate control of interference and negotiation with other operators for optimal spectrum usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple parties collectively use the shared spectrum, then spectrum utilization efficiency is improved, but interference among parties increases and may destroy spectrum sharing
Solution Approach 1:
The base station performs preliminary sensing of the shared spectrum before transmission to detect existing signals and estimate interference levels. User terminals also perform measurements and report results in advance. This preliminary action allows the system to assess interference conditions before actual transmission, enabling proactive interference management while maintaining spectrum sharing efficiency.
Solution Approach 2:
User terminals measure signals over the shared spectrum and transmit measurement reports back to the base station. The base station uses this feedback information to determine whether to utilize the shared spectrum and to adjust transmission parameters accordingly. This feedback mechanism enables continuous monitoring and adaptation to interference conditions, resolving the contradiction between spectrum utilization and interference avoidance.
2Reliability
If the base station senses and monitors shared spectrum signals, then interference control is improved, but device complexity increases
Solution Approach 1:
The sensing and measurement functions are merged into existing base station and user terminal devices. The base station's sensor combines with its existing signal processing capabilities, and user terminals use their existing receivers for measurement purposes. This merging approach enables interference control functionality without significantly increasing device complexity, as the sensing and measurement capabilities are integrated into already-present hardware components.
Data Source
AI summary
A base station in a spectrum sharing system includes a sensor configured to sense signals over a shared spectrum, a transceiver configured to receive at least one measurement report transmitted from at least one user terminal regarding signals over the shared spectrum sensed by the at least one user terminal and a processor configured to determine whether to utilize the shared spectrum according to the signals over the shared spectrum sensed by the sensor or acquired from the at least one measurement report. A user terminal in a spectrum sharing system includes a sensor configured to sense signals over a shared spectrum, a processor configured to generate a measurement report regarding the signals over the shared spectrum and a transceiver configured to transmit the measurement report to a base station so that the base station determines whether to utilize the shared spectrum according the signals over the shared spectrum.