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

By Hossam Afifi, Djamal Zeghlache

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

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ROS 0401] ROSENBERG, J. et. al, “SIP Extensions for Instant Messaging”, draft-ietfsimple-im-00 (work in progress), April 2001. [ROS 0301] ROSENBERG J. et. al, “SIP Extensions for Presence”, draft-ietf-simplepresence-00 (work in progress), March 2001. [SUG 01] SUGANO, H. et. al, “Presence and Instant Messaging Protocol (PRIM)”, draftmazzoldi-prim-impp-01 (work in progress), March 2001. html Chapter 4 QoS provisioning for mobile IP users Günther Stattenberger and Torsten Braun Institute of Computer Science and Applied Mathematics, University of Bern, Switzerland 1.

Owing to the similarity of the mechanisms needed in an IM protocol and those needed to establish an interactive session, protocols used for session initiation such as SIP are an ideal base to build IM protocols. When one user wishes to send an IM to another, the sender issues a SIP request using the MESSAGE method [ROS 0401]. A MESSAGE request MUST (see [BRA 97]) contain the following fields: To, From, Call-ID, CSeq, Via, Content-Length, and Contact header, formatted as specified in [ROS 0401].

1. MIPv6 Mobile IPv6 is an extension to IPv6 to offer to a nomadic node the way to always keep its home address and hence to be connected to its home network (Figure 2). In Mobile IPv6 a node has a Home Address that represents its original point of attachment. When visiting a new network the node acquires an address called the Care of Address (COA). This is the temporary address where packets are to be sent. There is also an agent that learns the positions of the node in the different subnets and forwards the traffic to these respective destination.

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