COGNITIVE RADIO NETWORKS
Cooperative cognitive radio
networks (CCRNs) incorporates cooperative communication into cognitive radio
networks, in which, primary users lease their spectrum to secondary users, and
in exchange, the primary users leverage secondary users as cooperative relays
to enhance their own throughput. Mobile operators offload their Internet
traffic to privately owned Wi-Fi access points (APs), much to the inconvenience
of non-cellular users served by the APs. However, by employing the CCRN scheme,
the mobile operator can lease a licensed channel to the AP, effectively
doubling its capacity. In this paper, we propose an implementation of the CCRN
framework applied to IEEE 802.11 WLANs.
MOBILE data
offload to small cell technology such as Wi- Fi or femtocell provides a
compelling solution for mobile operators who want to relieve the strain on
their core networks.
Compared to cellular macro cells, small cells provide increased spectrum reuse
in the coverage area, higher signal to noise ratio in the cell (hence superior
link bit rate for its users), and are highly cost effective even for large
scale deployments. Furthermore, the reduced transmission times enabled by the
superior link bit rates in the small cells directly translate into battery
power saving for the user devices. Wi-Fi hotspots operate in the unlicensed
bands and suffer from severe interference due to scarce spectrum availability.
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