Abstract
This chapter presents four key technologies that are currently under development and will play a large role in shaping the future of wireless networking—wireless mesh network routing, network independent roaming, gigabit wireless local area networks (LANs), and cognitive or spectrum agile radio. Transitions between points of attachment (POA) for a single network type are termed “homogeneous transitions,” and in the case of 802.11 networks, Task Groups TGk and TGr are developing and enhancing the mechanisms that enable seamless wireless local area network (WLAN) transitions. A number of standards-based and proprietary-equipment-development projects are underway aiming to deliver a physical (PHY) layer data rate of 1 Gbps, a technology threshold becoming known as Gi-Fi that is motivated by a range of home-, office-, and public-usage scenarios. One of the key concepts underlying cognitive radio is that of a software defined radio (SDR) in which the digital signal processing functions such as data coding and modulation are performed in software rather than hardware. This gives a cognitive radio the flexibility to use alternative processing schemes, depending on changing requirements.
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