Cognitive Radio Resource Allocation via Transmission Opportunity Vectors

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Solution Overview

Problem

The fixed spectrum allocation strategy in current wireless communication systems limits the efficient utilization of licensed spectrum by secondary users in cognitive radio systems, due to lack of information about spectrum allocation for primary users, leading to inefficient resource utilization.

Innovation Solution

A cognitive radio system with a resource allocation apparatus and method that evaluates transmission opportunities in primary communication systems, sets a transmission opportunity selection vector for secondary users, and transmits it to them, allowing for dynamic selection and utilization of available resources without interfering with primary users.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a fixed spectrum allocation strategy is employed, then the primary user can reliably use the licensed spectrum, but the secondary user cannot efficiently utilize the available wireless resources

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidinformation about spectrum allocation

Core Design Contradiction:

ProductivityVSLoss of information

Solution Approach 1:

The patent implements feedback mechanisms where secondary users report channel sensing results and transmission outcomes to the base station. The base station uses this feedback to continuously update and refine transmission opportunity selection vectors, enabling adaptive resource allocation that improves efficiency while respecting primary user allocations.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

Secondary users autonomously sense channel conditions and select transmission opportunities based on received selection vectors without requiring real-time primary user authorization. This self-service approach enables efficient resource utilization while the base station coordinates overall resource management.

Inventive Principle:

Principle #25Self-service

2Productivity

If the secondary user dynamically changes operating parameters to utilize available spectrum, then resource utilization improves, but interference with the primary user may increase

Engineering Contradiction:

Improveresource utilization efficiencyVSAvoidinterference with primary user

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The base station pre-calculates and provides transmission opportunity selection vectors to secondary users before actual transmission occurs. These vectors identify time-frequency resources that are predicted to be available, allowing secondary users to transmit without interfering with primary users while maintaining high resource utilization.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The base station acts as an intermediary between primary and secondary users. It receives spectrum allocation information from primary users, processes this information into transmission opportunity selection vectors, and provides guidance to secondary users. This intermediary role enables efficient secondary user transmission while protecting primary user operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Measurement precision

If the secondary user senses each transmission opportunity individually, then accurate availability detection is achieved, but the time and complexity of resource allocation increases

Engineering Contradiction:

Improvetransmission opportunity availability detection accuracyVSAvoidresource allocation time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The base station pre-evaluates and ranks multiple transmission opportunities in advance, creating selection vectors that order opportunities by expected availability and quality. Secondary users receive these pre-processed vectors and can quickly select appropriate transmission opportunities without performing exhaustive individual sensing of all possible resources.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies different sensing and evaluation strategies to different transmission opportunities based on their characteristics. The base station identifies and prioritizes opportunities with higher expected availability, allowing secondary users to focus sensing efforts on the most promising resources rather than uniformly sensing all opportunities.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP2858437B1Cognitive radio system, resource allocation apparatus thereof and method therefor

Publication Date: 2020.03.18 SONY GROUP CORP

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AI summary

Disclosed is a cognitive radio system, resource allocation apparatus thereof and method therefor. A resource allocation apparatus comprises: a transmission opportunity assessment device which is used to assess availabilities of transmission opportunities in radio resources of a primary communication system; a vector production device which is used to set a transmission opportunity selection vector for each secondary user in the cognitive radio system based on assessment results of the availabilities of transmission opportunities, wherein the transmission opportunity selection vector includes information for identifying multiple transmission opportunities assessed available; and a sending device which is used to distribute the transmission opportunity selection vector to the secondary user.