Interference Localization in Spectrum Co-existence Networks
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Solution Overview
Problem
Current frequency spectrum used for wireless operators is insufficient to meet growing demand, and uncoordinated transmission between primary and secondary users leads to interference, which is a challenge in spectrum sharing between incumbent and secondary users.
Innovation Solution
A method for coordinating spectrum sharing between primary and secondary users by determining attenuation coefficients, estimating interference, and adjusting network parameters, such as reducing transmission power, to ensure interference remains below a predetermined threshold, while also identifying and mitigating sources of interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If secondary users transmit signals without coordination with primary users, then spectrum utilization increases, but interference between primary and secondary users occurs
Solution Approach 1:
The system implements a feedback mechanism where secondary users measure the received power from primary users, compare it against a threshold, and adjust their transmission parameters accordingly. This closed-loop control enables spectrum sharing while maintaining interference protection for primary users.
Solution Approach 2:
The patent changes transmission parameters (power level, time slots, frequency channels) of secondary users based on measured interference conditions. By dynamically adjusting these parameters, the system achieves both high spectrum utilization and acceptable interference levels.
2Reliability
If transmission power of secondary users is increased, then communication quality improves, but interference to primary users increases
Solution Approach 1:
The system dynamically adjusts transmission power of secondary users based on real-time measurements of primary user signal strength. This dynamic adaptation allows communication quality to be optimized while maintaining interference protection, as power levels are continuously adjusted rather than fixed.
Solution Approach 2:
Before secondary users transmit at high power, the system performs preliminary measurements of primary user signals and calculates safe transmission power levels. This preliminary action ensures that increased transmission power will not cause unacceptable interference to primary users.
3Productivity
If spectrum sharing is implemented without coordination, then spectrum demand is met, but interference management becomes complex
Solution Approach 1:
The patent introduces a spectrum coordinator or sensing mechanism that acts as an intermediary between primary and secondary users. This intermediary manages interference by measuring signals, determining attenuation coefficients, and coordinating transmission parameters, thereby simplifying the overall interference management complexity.
Solution Approach 2:
Secondary users perform self-service by autonomously measuring primary user signals, calculating their own transmission parameters, and adjusting their behavior without requiring complex centralized coordination. This self-service approach reduces overall system complexity while maintaining spectrum sharing.
Data Source
AI summary
A method for sharing spectrum between a primary user and a secondary user includes receiving a signal transmitted by the primary user at a first network equipment of the secondary user, determining a first attenuation coefficient for the first network equipment, estimating interference from the first network equipment at a receiver of the primary user, and adjusting parameters of the first network equipment.