Background: Efficient resource allocation in Cooperative Cognitive Radio Network
(CCRN) is necessary in order to meet the challenges in future wireless networks. With proper resource
allocation, the Quality of Service (QoS) comprising of outage probability and data rate are
evaluated in this paper and sufficiently improved with proper subcarrier allocation.
Objectives: Another important parameter is Signal to Interference Ratio (SIR) which should be
above a threshold called minimum protection ratio to maintain the required QoS.
Results: The network considered is Orthogonal Frequency Division Multiple Access (OFDMA)
based Hybrid Cooperative Cognitive Radio Network (HCCRN) in downlink in which licensed as
well as unlicensed resources are used by cognitive user depending on it’s availability keeping the
interference constraint in limit. The number of subcarriers required is different for every user depending
upon its distance from the base station to satisfy the requirement of data rate which depends
on the experienced SIR. To avoid outage of users at the boundary of a cell, it is necessary to
allocate more number of subcarriers.
Conclusion: It is observed that for a given user position and outage probability, as the number of
subcarrier allocation in a subchannel increases high data rates can be achieved. This analysis can
be useful in allocation of subcarriers to users depending upon their position.