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By Hossam Afifi; Djamal Zeghlache

ISBN-10: 0585442932

ISBN-13: 9780585442938

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Security. Performance. Server-less operation. Caching and replication. 26 Applications and services in wireless networks • Reuse of existing protocol machinery. • Reliability. 3. Discussion Some salient architectural differences of the various protocols for IM and Presence services are discussed in the following paragraphs. 1 Direct (server-less) or server-based IM/Presence The IMPP requirements RFC [RFC 2778] dictates that two end-users wishing to communicate (send IM/Presence information) with each other must be able to do so either directly or via proxies (intermediate servers).

This can be kept close to 100% if we could find a proper set of cells to build up a VCT or cover the area with an UC. This is usually a closed geographical area inside people likely to move, but rarely go out. g. streets or corridors). The routing algorithm achieves a high value, but not 100%. The call-setup efficiency The number of cells, where the call was set up before the handover event occurs, is an other parameter, called call-setup efficiency (SE). From the reserved cells only one cell will be selected by the user (or none of them).

2. Shadow cluster In this case the system estimates a larger set of possible cells in the neighboring of the mobile’s actual cell, reserving channels also in the neighboring cells. This is the so-called shadow cluster concept. e. the set of base stations to which the mobile will likely to attach in the near future, the neighboring cells). Like a shadow, this set moves along with the mobile, incorporating new base stations while leaving old ones as they come under and out of the mobile’s influence.

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Applications and services in wireless networks by Hossam Afifi; Djamal Zeghlache

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