Ranked Sense Multiple Access Control Protocol for Multichannel Cognitive Radio-Based IoT Networks

Area of Science:

• Wireless Communication
• Internet-of-Things (IoT)
• Cognitive Radio (CR) Networks

Background:

• The proliferation of Internet-of-Things (IoT) devices strains license-exempt Industrial, Scientific, and Medical (ISM) bands, leading to spectrum scarcity.
• Cognitive Radio (CR) technology offers a solution by enabling unlicensed Secondary Users (SUs) to opportunistically access licensed spectrum white spaces.
• CR ad hoc networks are suitable for IoT but face challenges like the rendezvous issue and hidden primary terminal problems.

Purpose of the Study:

• To propose a novel protocol for multichannel CR-based IoT networks to address spectrum scarcity and network inefficiencies.
• To resolve the hidden primary terminal problem and mitigate hidden/exposed terminal issues in CR ad hoc networks.
• To improve the efficiency of channel selection and the rendezvous process in CR-based IoT systems.

Main Methods:

• Introduction of the Ranked Sense Multiple Access with Collision Avoidance (RSMA/CA) protocol.
• Implementation of mutual spectrum sensing to avoid hidden and exposed terminal problems.
• Development of a new channel ranking mechanism considering channel quality, Primary User (PU) activity, and Secondary User (SU) behavior.
• Performance analysis using a Markov chain model to evaluate normalized throughput.

Main Results:

• The proposed RSMA/CA protocol effectively resolves the hidden primary terminal problem.
• Mutual spectrum sensing in RSMA/CA successfully avoids hidden and exposed terminal issues.
• The new channel ranking mechanism enhances rendezvous efficiency.
• Markov chain analysis and simulations demonstrate superior performance of RSMA/CA compared to existing schemes.

Conclusions:

• RSMA/CA provides an efficient solution for spectrum access in multichannel CR-based IoT networks.
• The protocol significantly improves network performance by addressing key challenges in CR ad hoc networks.
• RSMA/CA offers a robust framework for opportunistic spectrum access, crucial for the growing IoT ecosystem.