Shared Frequency Assignment for Femtocell Search
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Solution Overview
Problem
Existing methods for mobile devices to connect with femtocells consume significant power due to the need to search for and locate these small base stations, which is inefficient and reduces battery life.
Innovation Solution
Implementing a shared frequency approach where mobile devices are assigned a common frequency for both macro and localized communication systems, allowing them to communicate with femtocells without needing to switch frequencies, thereby reducing power consumption and enhancing system selection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile devices search for and locate femtocells using traditional methods, then the devices can connect to femtocells, but power consumption increases significantly
Solution Approach 1:
The patent applies preliminary action by pre-configuring the mobile device with a prioritized list of frequencies that includes frequencies used by both macro and localized communication systems. This allows the device to immediately search for femtocells on the correct frequency without needing to perform comprehensive frequency scans, thereby reducing power consumption while maintaining reliable connection capability.
Solution Approach 2:
The patent changes the frequency parameter by establishing a shared frequency approach where both macro and localized systems operate on common frequencies. This eliminates the need for the device to switch between different frequency bands when searching for femtocells, significantly reducing the power consumption associated with frequency tuning and signal acquisition.
2Reliability
If mobile devices search for femtocells by switching frequencies, then they can locate the base stations, but system selection efficiency decreases
Solution Approach 1:
The device is pre-provisioned with a prioritized frequency list that includes frequencies for both macro and localized communication systems. This preliminary configuration eliminates the need for comprehensive frequency scanning during system selection, allowing the device to efficiently search only on relevant frequencies and significantly improving system selection productivity.
Solution Approach 2:
The patent implements universality by using a unified frequency approach where the same frequency is used for both macro communication and localized communication systems. This multi-functional frequency assignment allows the device to search for both types of systems simultaneously on the same frequency, eliminating the inefficiency of switching between different frequency bands during system selection.
3Adaptability or versatility
If a prioritized list includes multiple frequency entries, then the device can search more thoroughly, but the complexity of frequency assignment increases
Solution Approach 1:
The patent applies segmentation by dividing the frequency list into distinct segments: frequencies for macro communication systems and frequencies for localized communication systems. This structured segmentation in the prioritized list allows the device to systematically search for both types of systems without creating excessive complexity in the frequency assignment mechanism.
Solution Approach 2:
By implementing a universal frequency approach where the same frequency serves both macro and localized systems, the patent reduces the number of distinct frequency entries needed in the prioritized list. This multi-functionality simplifies the frequency assignment complexity while maintaining the adaptability to search for both types of communication systems.
Data Source
AI summary
Efficient frequency assignment for mobile terminals in coexisting wireless communication systems is described herein. The coexisting wireless communication systems comprise a macro communication system and a localized communication system. Two prioritized lists are defined, a first list comprising a first entry relating to the macro communication system and the second entry relating to the localized communication system, the first and second entries each listing at least one common frequency. Based on the first list, a mobile terminal uses communication protocols associated with the localized communication system.