Cognitive Radio PLMR Channel Allocation for High-Speed Data
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Solution Overview
Problem
Private Land Mobile Radio (PLMR) systems face challenges in supporting high-speed data services due to their voice-centric nature, narrowband channels, and inefficient circuit-switched communication, which limits their ability to handle mission-critical data applications effectively.
Innovation Solution
A wireless communication system that utilizes non-dedicated PLMR channels for bi-directional Point-to-Multipoint data communication, employing cognitive radio technology to detect and allocate idle channels, and combining channel resources using FDMA and TDMA schemes, while maintaining compatibility with existing infrastructure and voice priority policies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If narrowband PLMR channels (12.5 KHz or 6.25 KHz) are used to support voice communication, then voice quality is excellent and channel capacity is doubled, but data communication speed becomes very slow
Solution Approach 1:
The patent segments the PLMR channel into multiple sub-channels or frequency bins using FFT processing. This allows the system to allocate specific frequency portions for voice communication while utilizing other portions for data transmission, thereby enabling simultaneous voice and data services without compromising voice quality or data speed
Solution Approach 2:
The patent implements a multi-functional channel structure where the same narrowband PLMR channel can simultaneously support both voice communication and high-speed data services. Through cognitive radio technology and dynamic resource allocation, the channel serves multiple purposes: voice traffic, data traffic, and even relay communications, maximizing spectrum utilization
2Productivity
If dedicated data networks are deployed in licensed bands to support mission critical high speed data, then data service capability is improved, but system cost increases significantly due to requiring both licensed frequencies and new infrastructure
Solution Approach 1:
The patent enables existing PLMR infrastructure to provide both voice and high-speed data services through a single network platform. The cognitive radio base station dynamically allocates narrowband channels for multiple purposes including data transmission, voice communication, and relay services, eliminating the need for separate dedicated data networks and reducing overall system cost
Solution Approach 2:
The patent implements cognitive radio technology that allows the PLMR system to automatically detect available narrowband channels, dynamically allocate resources, and manage both voice and data services without requiring additional licensed spectrum or separate infrastructure. The system self-organizes to provide high-speed data services using existing unlicensed band resources
3Productivity
If non-dedicated PLMR channels are used for data communication, then channel utilization is improved and cost is reduced, but data transmission reliability may be affected by voice traffic priority
Solution Approach 1:
The patent implements dynamic resource allocation where the base station continuously monitors channel conditions and adjusts data transmission parameters in real-time. When voice traffic is detected, the system dynamically adapts by allocating different time slots, frequency bins, or power levels for data transmission, ensuring data reliability is maintained despite shared channel usage
Solution Approach 2:
The patent employs feedback mechanisms where the base station receives channel occupancy information from remote radios and adjusts its transmission strategy accordingly. The cognitive radio system uses this feedback to identify available narrowband channels, optimize data transmission timing, and ensure reliable data delivery while respecting voice traffic priority requirements
Data Source
AI summary
A system and method for delivery of high speed data services over dedicated and non-dedicated private land mobile radio (PLMR) channels using cognitive radio technology. The PLMR system provides bi-directional Point-to-Multipoint (PtMP) data communication between a dispatch center and many fixed or mobile remote terminals. A plurality of base stations communicate with a base station controller at the dispatch center and a plurality of remote radios communicate with at least one of the remote terminals. PLMR channel scanners, located in each base station and remote radio, scan the PLMR channels to determine which of the PLMR channels is idle at any point of time so that data communication may take place.