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two-way. Commanding 200 MHz of spectrum, MMDS has more bandwidth to burn than PCS and cellular services; it can also operate with just one base station since channel reuse is not a necessity, thus minimizing infrastructure cost. But thus far the service has enjoyed only limited success. Its cousin, LMDS, has been designed for two-way industrial parks Internet access and other high bandwidth applications. Operating at 25 GHz and up, commanding as much as 1 full gigahertz of spectrum, LMDS systems require a dense infrastructure of base stations and have been touted as high-speed Internet access alternatives to DSL and cable modems. LMDS installations are still spotty; as are networks operating in the unlicensed band (e.g., Metricom s Ricochet network). LMDS supports native Internet Protocol, as do unlicensed broadband carriers. None have found an expansive market as yet. Wireless LANs, bridges and fixed, would require a book in itself they vary by modulation system (e.g., spread spectrum or frequency hopping), transport protocols, network architecture (E.g., Ethernet or Token Ring), and price. A good source of information on Wireless LANs is PennWell Publishing s Wireless Integration Buyers Guides, 1999 and 2000 (the magazine is no longer published). For the majority of this book, we will be focusing on wireless wide area networks using one of the networking technologies outlined earlier. Some consultants specialize in wireless LANs for campus environments only; others can integrate mobile and fixed wireless technologies together. Many enterprise IT specialists seek an integration between wide area and local area RF sub-networks. For example, police departments may use CDPD in-vehicle for data and voice transmissions and to connect with computers in central crime fighting laboratories and agencies; the units can be switched automatically to LAN access in-building (e.g., entering police headquarters) to accomplish high speed updates and file transfers.

uch has been written about the how of wireless mobility In fact, if you visit Amazoncom and enter the search phrase wireless networks, you ll see that Amazon sells more than 17,000 books on the subject, each offering something to be learned That s an impressive number It s also a healthy sign for the industry that so many talented and willing people have taken a considerable amount of time to write books on wireless I ve contributed two of those books, and with thanks to my publishers at McGraw-Hill, one of them, 80211 (Wi-Fi) Networking Handbook, became a best-seller You can review the search findings for a long time and not locate book on the why of wireless, however Both of my prior books, and nearly all the other books mentioned on Amazon, are deep-dive technical treatises on the how of wireless.

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It seems clear, at least statistically if not practically, that the issue of why wireless has not been sufficiently studied, even though the why is a powerful driver of most purchases of wireless large area networks (WLANs) Surely these purchases would not be practical or worth the investment if the technology weren t reasonably sorted out by now Much like the technical side of the equation, the why element of wireless is also increasing in complexity The wireless technological changes I ve seen during the past two decades have been nothing short of breathtaking I remember struggling with my engineering team back in the early 1990s to work out an outdoor wireless connection to remain in place after the sun went down We spent nearly a week trying to connect a moving rental car wirelessly to the computer system inside our building.

MS state-management processes include the serving system MS statemanagement process and the HLR MS state management process. Generally, the MS state is set to active by the serving system and the HLR after a successful location update for the MS. Likewise, after a successful location cancellation, the HLR sets the MS state to inactive; the

Although the link would work well during the day, after we took a break near sundown, we d return after dark to continue the work, and the link was invariably down We d retune the link and get it up and running and continue our work into the evening But the next morning, no link So we d retune it again, and the link would work well all day until the sun set, at which point it would go down again This scenario was repeated for several days We eventually discovered that the wireless radio attached to the car became much cooler than the radio inside the building as the sun set This thermal difference was enough to cause the crystals in each radio to operate at slightly different frequencies, which meant that the radios simply couldn t hear each other.

We engineered a solution to resolve this and then rapidly moved on to dozens of other technical matters Looking back on that experience, I still shake my head and smile We knew so little about using radios in a business setting at that time Today s radios are incredibly complex and highly robust, and they share no meaningful comparison in data speeds to the radios we hand-crafted in the early 1990s Using a modern-day Ferrari as a metaphor for today s radios and the 80211 standard (created and maintained by the Institute of Electrical and Electronics Engineers, or IEEE), we were surely plodding along in Model Ts back then.

While no meaningful comparison can be made between today s enterprise-class WLANs and the radios we built back then, two very significant aspects have changed even more dramatically: the need for wireless communications and the methods by which wireless communication systems are used today..

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