By Hossam Afifi, Djamal Zeghlache
Contemporary advancements to instant networks carry with them the questions of carrier deals, provider administration, provider regulate, and caliber of carrier which are tested during this selection of views on rising instant applied sciences.
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Extra info for Applications & Services in Wireless Networks
This flow will most likely be regulated in advance, so that the bandwidth will not exceed the negotiated limit. Therefore no conflict with a expedited forwarding traffic shaper will occur. Again burst protection is a critical issue. Setting the loss-critical flag does not make much sense for TCP flows, since TCP automatically retransmits lost packets. Therefore, this flag could be “abused” for indicating bandwidth-regulated or unregulated TCP streams. In this case a regulated TCP stream could be transfered by expedited forwarding, too.
Two alternate interaction scenarios between the presentity and the watcher are feasible. These include the typical case with the watcher querying the presentity and the reverse case of the presentity querying the watcher. The latter scenario is applicable for dealing with the security issue of identifying snoopers. 3 Security comparison The authentication mechanisms used within the different IM and Presence protocols vary: • SIP: Rather than a specific authentication mechanism being mandated, SIP allows for several possible alternate mechanisms.
If the area covered by the virtual tree is large enough then there is a chance for the mobile user to remain within this area during the call. CAC is done only when the user enters into a cell belonging to a new VCT. The idea of the virtual tree can be summarized as collection of cells in which each connection is described by a VCN (Virtual Connection Number) list. These numbers define the possible paths between the root and the base stations located within the virtual tree. The packets leave the virtual tree through the root.