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| A presence server is a software platform that gathers presence information from multiple providers and then shared it between those providers and any other applications that are interested in it - and it does it all in real-time.
Nable¡¯s presence server has been developed according to OMA¡¯s Presence & Group Reference Model and so it can provide the group-based presence feature in addition to the individual-based presence feature. Furthermore, it supports many new attractive functions such as the filtering, the rate control, and the partial presence and so it can work perfectly in many different network configurations. Nowadays, IMS service providers want to use the presence services in many different ways. To meet this trend, Nable¡¯s presence server supports the contents indirection function and can handle various form of presence information including multimedia contents.
When Nable¡¯s presence server is used in combination with other IMS application servers such as IM, video sharing, video chatting, and PoC/PTA, it enriches them and so the resulting end-user experience becomes more enjoyable and productive. Like the other Nable¡¯s enablers, the presence server is based the architecture that can support the linear system capacity expansion and so IMS service providers can expand the capacity gradually as the demand increases.
Besides the presence server, Nable provides the presence contents server. This server does the role that stores and manages presence-based multimedia contents (icon, map, photo, sound) including PIDF documents. The operators can use this server to provide rich and multimedia presence information, which were not possible under the SIP/SIMPLE standards.
The below illustrates the simple diagram of an IMS network with the presence server and the contents server.
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| Presence Server |
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PRS : Presence Server
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RLS : List Presence Server |
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Contents Server : Presence Contents
Server |
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PNA : Presence Network
Agent |
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PEA : Presence External Agent |
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| Standards |
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IETF RFC 3265, RFC 3856, RFC 3863, RFC 3857, RFC 3858
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IETF RFC 3863, RFC 3903, RFC 4479, RFC 4480, RFC 4481 |
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IETF RFC 4482, RFC 4483, RFC 4660, RFC 4661 |
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OMA Presence Simple |
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OMA XML Document Management |
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3GPP TS 22.141, TS 23.141, TS 23.841, TS 24.141 |
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