Feedback Bits Allocation for Guaranteed Bit Rate Services in Cooperative Cognitive Radio Networks

Area of Science:

• Wireless communication networks
• Cognitive radio technology
• Resource allocation in telecommunications

Background:

• Growing demand for multimedia sharing services necessitates higher minimum data rates for wireless users.
• Cooperative cognitive radio (CR) networks must balance quality-of-service (QoS) for secondary users (SUs) with interference constraints to primary users (PUs).
• Limited feedback resources pose a challenge for optimizing network performance.

Purpose of the Study:

• To propose an efficient feedback bit allocation scheme in CR networks.
• To guarantee minimum data rates for SUs under limited feedback constraints.
• To satisfy inter-network interference constraints between secondary transmitters (STs) and primary users (PUs).

Main Methods:

• Investigating the required number of feedback bits between STs and PUs for guaranteed SU data rates.
• Developing a feedback bit allocation strategy to optimize SU performance.
• Analyzing the impact of the proposed scheme on SU average sum rate and outage probability.

Main Results:

• Determined the optimal feedback bit allocation for guaranteed minimum data rates for SUs.
• The proposed scheme effectively maximizes the average sum rate of SUs.
• The strategy successfully reduces the outage probability for SUs while respecting PU interference constraints.

Conclusions:

• The developed feedback bit allocation scheme is effective for cooperative CR networks.
• It balances the competing needs of SU data rate guarantees and PU interference mitigation.
• This research contributes to efficient resource management in wireless communication systems.