Coexistence Scheduler for Multi-Technology Spectrum Sharing
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Solution Overview
Problem
The increasing convergence of different radio technologies into shared frequency bands poses challenges for spectrum management and network design, as existing techniques struggle to efficiently allocate resources and minimize interference between various radio technologies.
Innovation Solution
The implementation of a gateway system that computes a coexistence resource schedule to allocate sub-carriers and timeslots across multiple radio technologies, allowing them to coexist on the same carrier frequency through frequency- and/or time-domain sharing, using a receiver subsystem, coexistence scheduler, and radio-technology-specific schedulers to generate and transmit radio signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple radio technologies use different frequency bands, then interference between technologies is minimized, but spectrum utilization efficiency deteriorates due to underutilization of available frequency resources
Solution Approach 1:
The patent segments the frequency band and time resources into discrete sub-carriers and timeslots, creating a granular resource grid that can be dynamically allocated to different radio technologies. This segmentation enables fine-grained control over resource allocation, allowing multiple technologies to share the spectrum efficiently while minimizing interference through orthogonal resource assignment.
Solution Approach 2:
The patent introduces a new dimension of resource allocation by combining frequency-domain sub-carriers with time-domain timeslots to create a two-dimensional resource grid. This dimensional expansion allows for more flexible and efficient spectrum utilization, enabling multiple radio technologies to coexist by allocating resources across both frequency and time dimensions rather than relying solely on frequency separation.
2Productivity
If a coexistence resource schedule is computed to allocate sub-carriers and timeslots, then resource allocation efficiency improves, but system complexity increases due to the need for centralized scheduling and coordination
Solution Approach 1:
The gateway system performs multiple functions including receiving data from multiple radio technologies, computing the coexistence resource schedule, generating radio signals for transmission, and managing resource allocation. This multi-functional approach consolidates complexity into a single coordinating entity rather than requiring complex distributed coordination among multiple independent systems.
Solution Approach 2:
The gateway system acts as an intermediary between multiple radio technologies with different resource grid definitions. It computes a unified coexistence resource schedule that reconciles the different sub-carrier and timeslot definitions of various radio technologies, enabling them to share the frequency band harmoniously without direct interaction or complex peer-to-peer coordination.
3Reliability
If radio technologies use different sub-carrier and timeslot definitions, then each technology can operate optimally according to its standards, but resource sharing between technologies becomes difficult
Solution Approach 1:
The gateway system dynamically adjusts and transforms the resource grid parameters (sub-carrier spacing, timeslot duration, resource element patterns) to create a coexistence resource schedule that accommodates the specific requirements of each radio technology. By changing these parameters adaptively, the system maintains compliance with individual technology standards while enabling effective resource sharing across multiple technologies.
Data Source
AI summary
Novel techniques are described for coexistence of multiple radio technologies in a shared frequency band. Techniques described herein enable multiple radiofrequency networks using different radio technologies to coexist on a same carrier frequency by exploiting various frequency- and/or time-domain sharing of scheduled resources. For example, data signals are received for transmission over different radio networks according to different radio technologies (having different respective sub-carrier definitions and timeslot definitions). A coexistence resource schedule is computed from the communication resource grids define an allocation of sub-carrier and/or timeslot resources among the radio technologies. Radio technologies can then be generated from the data signals in accordance with the coexistence resource schedule and the communication resource grids. The radio signals can then be transmitted over the radio networks, with the multiple radio technologies coexisting in orthogonal components of a communication channel.