In this survey, smart environment wireless networks are reviewed. The focus is on using theCognitive Radio (CR) technology and Radio Frequency Identification (RFID) technology inthese smart networks. Therefore, the reviewed research papers are studying the Cognitive Radiousage in smart homes and hospitals wireless networks. The main objectives of using CR inwireless networks are providing the flexibility in networks allocation, managing wirelessnetworks efficiently and saving time and cost for communications. In addition, the papersinclude how the Radio Frequency Identification technology is merged with the Cognitive Radioto produce a smart environment. Although new technologies like CR and RFID haveadvantages, they also have disadvantages such as network interferences, network allocation andusers’ priorities management. For this reason, recent studies are describing the challenges thatfacing CR and RFID technologies and new ways to solve them.
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