By Hossam Afifi, Djamal Zeghlache
Contemporary advancements to instant networks carry with them the questions of provider deals, carrier administration, carrier keep watch over, and caliber of provider which are tested during this selection of views on rising instant applied sciences.
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Messages may be sent (or received) either to individuals or to groups Protocols for Instant Messaging and Presence 29 of users. As in the previously discussed IETF IM protocol (PRIM), Wireless Village is server-based. Unlike other protocols discussed here, it offers the user the ability to request confirmation of delivery of a message to the remote user. Furthermore, IM messages can be potentially forwarded to another user. The protocol enables a user to block messages from a particular user whether sent directly (to him) or as part of a group conversation.
The protocol enables a user to block messages from a particular user whether sent directly (to him) or as part of a group conversation. 3 Group feature Group communications may be employed for carrying out a group conversation either in the public or the private domain. While public groups, created by the service provider, are open to all users, private groups are created by individual users. Private groups may, in turn, be either open (similar to public groups) or closed. Having obtained permission (if needed) to join a group, a user may leave a group at any time at his choosing.
4) The BB reports the status of the SLS back to the mobile host. Failure can be caused by errors during the configuration or – most likely – by unavailable bandwidth. Figure 3. 2. Migration to a new domain If the mobile user connects to a foreign domain the SLS of its home domain has to be transferred to the foreign network. The mobile host can check whether it is connected to a foreign network by checking for a care-of address. The message sequence for this case is shown in Figure 4. QoS provisioning for mobile IP users 35 Figure 4.
Applications & Services in Wireless Networks by Hossam Afifi, Djamal Zeghlache