- The IMS: IP Multimedia Concepts And Services, Second Edition.
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About Miikka Poikselka. Miikka Poikselka. Books by Miikka Poikselka. No trivia or quizzes yet. Here we concentrate only on those parameters that are necessary for the SBLP. Chapter 11 contains a general description for the whole session setup. Description of RTCP bandwidth:. Authorization token In Figure 3. It is created in the PDF when the authorization data are created. Its syntax conforms to [RFC].
Any participating party may add or drop a media component from an ongoing session. As stated in Section 2. SRF groups are used in the following way:. If a network does not set the SRF indication, then the UE is free to group media streams as it likes.
Ebook The Ims Ip Multimedia Concepts And Services In The Mobile Domain
As the PDF receives the forking indication it also assigns the previously allocated authorization token to the forked response. Ad- ditionally, the PDF authorizes any additional media components and any increased QoS requirements for previously authorized media components, as requested by the forked response. The requested QoS parameters include the information listed in Table 3. The key factors are the nature of media streams i. In our example it could open one new PDP context for video and audio. Finally, Table 3. The UE has now completed Step 7 in Figure 3.
The requested QoS parameters are inserted within the QoS informa- tion element. If an authorization token is missing, then the GGSN may either reject the request or accept it within the limit imposed by a locally stored QoS policy.
The exact content of the request is described in Chapter Enforces the decision after receiving an authorization decision. The exact content of the decision is described in Chapter If all the requested parameters lie within the limits, then PDP context activation will be accepted. The gate de- scription allows a gate function to be performed. The gate function enables or disables the forwarding of IP packets. The closing of the gate may be part of the revoke authorization decision. Stores the binding information. May cache the policy decision data of the PDF decisions. If the GGSN does not have cached information, then it performs the above-described functions.
The authorization token is valid. The corresponding SIP session exists. This capability was added in Release 6. The UE follows the grouping indication. The same is applied to other, related PDP contexts. This may be needed, for example, in the case of forking. Opening the gate could be sent as a response to an initial authorization request from the GGSN or the decision can be sent as a standalone decision.
In this case end-users will lose all announcements which are to be delivered before completing the session, as the GGSN will drop all incoming user-plane IP packets. This function is used, for example, when a media component of a session is put on hold due to media re-negotiation. The PDF removes the authorization for the corresponding media com- ponent s. When the PDF receives a report that a bearer has been released, it could request the P-CSCF to release the session s and revoke all the related media authoriza- tion with the procedure described in Section 3.
For charging correlation to be carried out as described in Section 3. Four request and answer pairs are used in the Gq reference point:.
IMS – the IP Multimedia System as NGN Service Delivery Platform
This information is used in the PDF to make an authorization decision about the request received via the Go reference point. The PDF is now ready to authorize the whole bearer activation request.
Moreover, the P-CSCF may indicate that it is interested in receiving indications of loss of bearer, recovery of bearer or release of bearer indication forwarding policy. This could occur, for example, when a certain component is removed from a SIP session. This could occur, for example, when only the video component of a multimedia session is dropped. It may contain, for example, SIP session information. This could occur, for instance, when a SIP session is released.nnyff.com/3966.php
The IMS: IP Multimedia Concepts And Services, Second Edition [Book]
IMS concepts 75 3. The capability to charge based on session or event or service is one of the key advantages that the IMS enables for operators. In this model a user typically receives a bill on a monthly basis, which shows the chargeable items during a particular period. A pre-paid service requires online charging support.
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This sounds rather easy, but standardizing a charging solution has been very painful. This section is based on Release 6 charging solutions as they were in June The OCS supports two reference points from other network entities. The request contains much information about the event that launched the trigger e. Further ACR s may be used as well if the session properties are changed e.
In case of a single end-user to network transaction e. The usage of Diameter requests is further described in Section 3. In Figure 3. In this example a user sends a subscription request to an AS. The subscription request could, for example, be a request to discover who are the members of a particular Push to talk Over Cellular group.
This enables sending charging information to a single CDF. How this can be done is explained in Section Among the number of resources could be, for example, time or allowed data volume. When resources granted to the user have been consumed or the service has been successfully delivered or terminated, the IMS entity informs the OCS of the number of resources consumed. It is also possible for the OCS to receive subsequent requests from the IMS entity during service execution if all granted resources are consumed.
In this case the OCS needs to perform a new credit authorization. The direct debiting model is appropriate when the IMS entity knows that it could deliver the requested service to the user itself.