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Network services investment guide - Gaynor M.

Gaynor M. Network services investment guide - wiley publishing , 2003. - 322 p.
ISBN 0-471-21475-2
Download (direct link): networkservicesinvestment2003.pdf
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When service providers or the organization's IT department manage the wireless access points, each user has less to worry about but also less control over the wireless service. This more centralized setup gives users less ability to experiment because they need permission from the network manager. Furthermore, the IT department or the service provider decides when to upgrade to a newer technology, which may not meet the needs of the most demanding users.
Overall, having one access point in every home and office is, in total, the most expensive and time-consuming way to provide wireless service. This means I do my own installation, configuration, and maintenance of the access point. While each individual access point is easy to install and manage, there are so many of them that the aggregate effort is great. This approach is inefficient in its use of equipment at my house my access point never has more than my three family members; in my office, I am the only user. While not efficient, this structure works well, which is why it is creating a large user base.
The preceding analysis, which illustrates the value of 802.11's flexible infrastructure allowing a continuum from a distributed to centralized management structure, is similar to the argument I made in Chapter 10 about the value of SIP because its flexibility allows services to be built with either an end-2-end structure or a centralized architecture. SIP allows end-2-end users to experiment, similar to how users can set up an 802.11 network infrastructure to experiment with. SIP also allows services to have a centralized structure via SIP proxy severs, similar to how 802.11 allows a large service provider to supply this technology with efficient central management.
Coexistence of 802.11 and 3G Cellular: Leaping the Garden Wall 207
SIP allows both environments to coexist, similar to how many structures will coexist with 802.11 wireless (and cellular) services. While SIP and
802.11 are completely different technologies, they have amazing similarities in the flexibility they offer regarding management structure because they both allow a continuum of architectures from distributed to centralized.
Next-Generation Cellular Networks
Cellular network infrastructure, while not as flexible as 802.11 technology, does have some business and technical advantages. Cellular technology has a very different goal from 802.11 technology 3G aims to provide wireless broadband services in a ubiquitous manner with a centralized management architecture, which it does very well. This is different from the current uses of 802.11, which is focused on coverage of hot spots. In its current form of deployment, 802.11 will not make sense in sparsely populated areas; the economics just don't work out. One of 3G's main business and technology advantages is its ability to cover large areas efficiently; with its centralized management structure it can efficiently provide these services to many users at affordable prices.
The intelligent and centralized structure of cellular networks allows service providers to know what users are doing. This has such advantages as better security and better Quality of Service (QoS). The centralized control inherent with current (and next-generation) cellular networks bodes well for good security and grantees of service because the network is aware of what all users are doing. The dreaded Denial of Service (DoS) attacks that have become popular are much more difficult to launch and sustain when an intelligent network knows what its users are doing. This information what the network knows about its users and what they are doing also makes QoS less complex. One advantage of the centralized network infrastructure is that when you watch users, you can also protect them and guarantee what they can do.
Most industry experts agree that large centralized cellular service providers are good at billing customers. One strong argument for large centralized service providers is the convenience of one-stop shopping. These cellular service providers are perfectly set up to become centralized billing agents because of their centralized control and smart network design. Many of the wireless providers have roots in the traditional phone networks, which means they are good at keeping track of what users are doing and billing them appropriately. Many users value the ability to roam anyplace in the country (and the world with tri-band phones) and use
208 Chapter 11
many different services from many different service providers, while receiving a single bill. Cellular providers are good at reaching agreements with other service providers, giving users the convenience of a single bill containing fees for many different services. Large cellular service providers are likely to succeed with this business model of consolidated billing information from many services because it is what they have been doing for many years.
Networks with a centralized infrastructure, such as cellular, are very efficient at equipment usage. Deciding how to deploy wireless access points covering larger areas is a complex decision requiring advanced engineering techniques [3]. There are many factors to consider, such as the local geography, man-made obstructions, and interference from other sources. Efficiently deploying equipment requires centralized planning, which is inherent with cellular networks. Individual users in neighborhoods and users setting up rough access points in office environments will find it impossible to coordinate their decisions to implement the most efficient network infrastructure. Networks with a central management structure will always use the limited resources to their best advantage because of the ability to centrally plan their networks.
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