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PCS mimics the same basic services of GSM, discussed in the preceding chapter The primary difference is that the PCS operators are primarily North American based whereas the GSM standard has been implemented by the rest of the world Differences exist in the overall operation, but these systems operate in similar fashion The ability of the PCS system to learn the identity of the roaming device, is similar to the smart card used in Europe The services allowing the Central Office equipment and databases to communicate with each other, and track the roamer simplifies the billing and the service functions Moreover, the feature transparencies available with PCS creates a seamless network atmosphere Although the two differing technologies are different, they are similar at the same time The real value is achieved when the user can operate the wireless device (the phone) transparently between supplier networks, with the same look and feel as in the home system
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23: Wireless Data Communications (Mobile IP)
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Introduction
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As the convergence of voice and data continues, a more discreet change is also coming into play While data is considered fixed to a location, the end user is now more mobile This opens a new set of challenges for the industry and manufacturers alike, because of the need for mobility What once was a simple procedure of connecting the user s modem to a land line now poses the need to connect that same user to a device while mobile Protocols need to be more flexible, accommodating the mobile user as the device is moved from location to location Moreover, the physical devices (for example, the modems) must be moved often In a dial-up, circuit-switched communications arrangement, this is not a major problem The user can unplug a modem, reconnect it to a landline elsewhere, and dial from anywhere However, when we use IP as our network protocol, data is routed based on a network/subnetwork address Routing tables keep track of where the user is located and route the datagrams (packets) to that subnetwork (see Figure 23-1 ) When a mobile user logs on and attempts to dial in to the network, the IP address is checked against a routing table and routed accordingly Updating the tables can be extremely overhead intensive, and it can produce significant amounts of latency in the Internet or Intranet Using an ICMP Route Discovery Protocol (IRDP), which is part of the TCP/IP protocol suite, helps However, when the IRDP process updates its tables, we use a lot of bandwidth Figure 23-2 is an example of the IRDP process where a message is generated by a host to learn all routes available to get to and through the network
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Figure 23-1: Routing table
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Figure 23-2: ICMP Route Discovery Protocol learns the new addresses and routers in the network Something needs to be done to accommodate the use of mobile IP by an escalating number of users wanting to log on anywhere Of course one solution is to use the Dynamic Host Configuration Protocol (DHCP), which uses a server-based mechanism to allocate a new IP every time a user logs onto the network or assigns a static IP address to a user who may be using a diskless PC The purpose of the DHCP was to facilitate the mobile or not permanently attached user in an ISP network where addresses are limited and casual users are the norm So the industry had to arrive at a solution allowing casual and nomadic users the same access while they travel (roam) as when they are in there fixed office location Figure 23-3 shows the growth curve of wireless data users attempting to use mobile IP and wireless data communications over the past couple of years In this graph we see that the numbers justify the concern and the effort being afforded to the problem The number of wireless users in the world is escalating and the 500 million users shown in this graph are conservative estimates We are living in a mobile society where users want their data, when they want it, where they want it, and how they want it! What percentage of these wireless users will want data over their connection remains to be seen However, early estimates are that over one-fifth will want their data in a mobile environment
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Figure 23-3: Wireless data subscribers (in millions)
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