By Hossam Afifi, Djamal Zeghlache

ISBN-10: 1903996309

ISBN-13: 9781903996300

Contemporary advancements to instant networks carry with them the questions of provider deals, carrier administration, carrier regulate, and caliber of provider which are tested during this choice of views on rising instant applied sciences.

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This is the initial login sequence. After initial authentication, additional IM/Presence messages sent over this TCP connection are not authenticated. However, these messages may be checked by the server for suitable authorization. 4 Transport mechanisms • SIP: Since SIP is transport neutral, it may use either UDP or TCP for transport. The SIP RFC [HAN 99] states that SIP User Agents SHOULD implement both UDP and TCP, while SIP servers (proxy, redirect, register) MUST implement both UDP and TCP.

We selected five parameters describing the main characteristics of the presented methods. 1. Basic parameters for comparison Channel efficiency One parameter can be the channel efficiency (CE), the average channels reserved for the communication during the call. If we do not assign the channel before the handover (this is the method which we use for the base of comparison) this value is 1 for LP, UC, VCT, SC and the routing algorithm presented in Section 5. When the handover is too fast, or the communication requires a total seamless handover it can happen that for shorter period of time two channels are assigned for the same call.

The main idea is that we use the radio control channels established for radio communication with the radio network controller to piggyback Mobile IPv6 messages in both directions. This ensures that we have only one mobility management all the time. It gives also the necessary high handover speed to IPv6. The network elements that are used in this architecture are shown in Figure 3. Mobile IPv6 as a data protocol for UMTS AA RN AR RN Attach(BU) Activate (BU) Routing Area Update (BU) SG 43 MAP AA DIAMETER AR GG HA Figure 3.

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Applications & Services in Wireless Networks by Hossam Afifi, Djamal Zeghlache

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