Multi-Band RF System with Priority Channel Selection
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Solution Overview
Problem
The limited spectrum in the license-exempt DECT band restricts user density in wireless communications, leading to system failures when multiple users attempt simultaneous operation, as the available number of carrier frequencies is insufficient to accommodate high user demand.
Innovation Solution
Implementing a method for multiple radio frequency band operation, where devices can switch between the protected DECT band and a license-free ISM band, such as 900 MHz, to establish priority and non-priority services channels, thereby increasing user density by utilizing additional spectrum and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices operate only in the protected DECT band, then interference is controlled and communication quality is maintained, but user density is limited due to insufficient carrier frequencies
Solution Approach 1:
The patent introduces a new frequency dimension by operating in multiple RF bands (protected DECT band and unlicensed ISM band) instead of relying solely on a single band. This dimensional expansion provides additional carrier frequencies and channels, enabling the system to accommodate higher user density while maintaining communication quality through selective band usage and handover mechanisms
2Quantity of substance
If additional RF bands are utilized to increase user density, then more carrier frequencies are available, but system complexity increases due to band management requirements
Solution Approach 1:
The patent implements dynamic band management where the system can adaptively switch between protected and unlicensed bands based on service priority, channel availability, and interference conditions. The base station and portable devices dynamically perform band selection, channel assignment, and handover operations, allowing flexible resource allocation that increases user density while managing complexity through intelligent control algorithms
Solution Approach 2:
The patent introduces an intermediary band selection mechanism that mediates between the protected DECT band and unlicensed ISM band. This intermediary layer manages the complexity of multi-band operation by handling band selection, channel allocation, and handover decisions, shielding upper-layer applications from the complexity of direct multi-band management while enabling high user density
Data Source
AI summary
Methods and apparatuses for multiple radio frequency band operation are described. In one example, a first device is operated in a first radio frequency band. A connection request is received at the first device from a second device utilizing the first radio frequency band. The connection request is processed to designate whether the connection request is a priority services request type or a non-priority services request type. Responsive to designating the connection request as the non-priority services request type, a non-priority services communications channel is established utilizing a second radio frequency band. Responsive to designating the connection request as a priority services request type, it is determined whether a priority services channel is available or not available in the first radio frequency band. A priority services communications channel is established utilizing the first radio frequency band or an interim non-priority services communications channel is established utilizing the second radio frequency band.