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19、 Call DeliveryREVISION HISTORYCopyright Telecommunications Industry Association 2007. All rights reserved.This document is subject to change.Revision Date RemarksTIA-41.321-E January 2007 Initial publication.TIA-41.321-EiiThis page is left blank intentionally.TIA-41.321-E1234567891011121314151617181
20、92021222324252627282930313233343536373839404142434445464748495051525354555657585960321-1 Call Delivery1 Call DeliveryThis section depicts the interactions between network entities in various situations related toautomatic roaming and Call Delivery (CD). These scenarios are informative.1.1 CD Demand
21、Activation or De-ActivationFor a description of the demand activation or deactivation of CD by an authorized MS, seePart 311 Section 2.1.1.2 CD Invocation to an Idle MS on Another MSCThis scenario describes call delivery to an MS that is outside the serving area of the MSC wherethe call originates.
22、MSCs in the functional model described in NAM contain switching functionsTIA-41.321-ECall Delivery123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960321-2only and must interact with their associated HLR and VLR to obtain database informatio
23、n foran MS; in a real application, the HLR/VLR functions may be integrated with the MSC.a. A call origination and the dialed MS address digits (i.e., directory number) are receivedby the Originating MSC.b. The Originating MSC sends a LOCREQ to the HLR associated with the MS; thisassociation is made
24、through the dialed MS address digits (which may not be the MIN).c. If the dialed MS address digits are assigned to a legitimate subscriber, the HLR sendsa ROUTREQ to the VLR where the MS is registered.d. The VLR then forwards the ROUTREQ to the current Serving MSC. Note that the MSmay have roamed wi
25、thin the domain of the Serving VLR and reported its new locationto that VLR (via the new Serving MSC); the Serving VLR may not have reported thischange in location to the HLR.In reaction to the ROUTREQ, the Serving MSC consults its internal data structures to determine if the MS is already engaged i
26、n a call on this MSC. In this scenario, since the MS is idle, we are assuming that the MS is not known to the Serving MSC.e. The Serving MSC may then obtain the service profile of the MS from its VLR bysending it a QUALREQ.Figure 1 CD Invocation to an Idle MS on Another MSC abcdefghijklMSCVLRHLR MSC
27、call origination Serving System routreq TLDN Originating System ROUTREQ MSID QUALREQ routreq TLDN LOCREQ DGTSDIAL call setup QUALREQ qualreq qualreq LRT RRT RRTTLDNAT QRTlocreq TERMLIST, REDIND QRTLOCREQ DGTSDIAL TIA-41.321-E123456789101112131415161718192021222324252627282930313233343536373839404142
28、434445464748495051525354555657585960321-3 Call DeliveryThis step can be eliminated if the service profile is obtained by the Serving MSC prior to the termination attempt (e.g., when the MS registers). Subsequent scenarios do not explicitly show this step; they assume that the Serving MSC either alre
29、ady has the profile available when the ROUTREQ arrives or obtains the profile in a manner similar to that shown here.f. If the MS is unknown to the VLR or if the information requested by the MSC is notavailable at the VLR, the VLR sends a QUALREQ to the HLR associated with the MS.g. The HLR sends a
30、qualreq to the VLR.h. The VLR sends a qualreq to the Serving MSC.i. The Serving MSC allocates a TLDN (Temporary Local Directory Number) and returnsthis information to the VLR in the routreq.j. The VLR sends the routreq to the HLR.k. When the routreq is received by the HLR, it returns a locreq to the
31、 OriginatingMSC. The locreq includes routing information in the form of the TerminationListparameter, along with an indication of the reason for extending the incoming call (i.e.,for CD) in the DMH_RedirectionIndicator parameter.l. The Originating MSC establishes a voice path to the Serving MSC usin
32、g existinginterconnection protocols (e.g. SS7) and the routing information specified in thelocreq.TIA-41.321-ECall Delivery123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960321-41.3 CD Invocation to an Idle, Local MSThis scenario describes
33、 CD invocation to an idle MS that is served by the MSC where the calloriginates.a. A call origination and the dialed MS address digits (i.e., directory number) are receivedby the Originating MSC.b. The Originating MSC sends a LOCREQ to the HLR associated with the MS; thisassociation is made through
34、the dialed MS address digits (which may not be the MIN).c. If the dialed MS address digits are assigned to a legitimate subscriber and the HLRdetermines that the subscriber is currently served by the Originating MSC, the HLRsends a locreq to the Originating MSC.d. The Originating MSC, recognizing it
35、self as the Serving MSC via the MSCIDparameter contained in the TerminationList parameter, then attempts to terminate thecall to the MS identified in the locreq.Figure 2 CD Invocation to an Idle, Local MSabcdMSC MS HLROriginating SystemLOCREQ DGTSDIAL call termination call origination locreq TERMLIS
36、T, REDIND LRTTIA-41.321-E123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960321-5 Call Delivery1.4 CD Invocation to a Busy MSThis scenario describes CD invocation to an MS that is busy in a call outside of the serving areawhere the call ori
37、ginates.a-d. Same as CD, see Part 321, sec. 1.2, Steps a-d.e. In reaction to the ROUTREQ, the Serving MSC checks its internal data structures anddetermines that the MS is busy in another call. The status of the MS is returned to theVLR by the Serving MSC via the AccessDeniedReason parameter in the r
38、outreq.1f. The VLR sends the routreq to the HLR.g. The HLR returns the busy status to the Originating MSC in the locreq.h. The Originating MSC then returns a busy indication to the calling party.Figure 3 CD Invocation to a Busy MS1In some environments it may be necessary to return a TLDN in addition
39、 to, or in place of, the MS status.Handling of these situations is not illustrated by the above figure.abcdefghMSCVLR HLR MSC call origination Serving System ROUTREQ MSID locreq ACCDEN=Busy Originating System ROUTREQ MSID routreq ACCDEN=Busy LOCREQ DGTSDIAL busy indication routreq ACCDEN=Busy LRT RR
40、TRRT TIA-41.321-ECall Delivery123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960321-61.5 CD Invocation with No Page Response or No AnswerThis scenario describes CD invocation to an MS when no page response or no answer isreceived by the Se
41、rving MSC after TLDN call arrival.a-d. Same as CD, see Part 321, sec. 1.2, Steps a-d.e-h. Same as CD, see Part 321, sec. 1.2, Steps i-l, respectively.i. Either the MS fails to respond to the page or does not answer after alerting.j. The Serving MSC routes the call to an appropriate tone or announcem
42、ent.k. The call is then disconnected using the protocols defined by the interconnectionmethod.Figure 4 CD Invocation with No Page Response or No AnswerabcdefghijkMSCVLR HLR MSC call origination Serving System ROUTREQ MSID locreq TERMLIST, REDIND Originating System ROUTREQ MSID routreq TLDN LOCREQ DG
43、TSDIAL call setuproutreq TLDN page or answer timeoutannouncementcall release call release LRT RRT RRT TIA-41.321-E123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960321-7 Call Delivery1.6 CD Invocation to an Inaccessible MSThis scenario des
44、cribes CD invocation to an MS that is inaccessible due to: CD inactive, MS inactive MS unregistered.a-b. Same as CD, see Part 321, sec. 1.2, Steps a-b.c. The HLR determines that the MS is not accessible (e.g., CD is inactive, MS is inactive,or MS is not registered). The HLR returns a locreq to the O
45、riginating MSC includingthe reason for denying access in the AccessDeniedReason parameter.d. The Originating MSC provides treatment to the served MS as implied by theAccessDeniedReason parameter and, if present, the AnnouncementList parameter. Inthis case, the treatment is to provide call refusal tr
46、eatment.e. The Originating MSC releases the call.Figure 5 CD Invocation to an Inaccessible MSabcdeMSC HLROriginating SystemLOCREQ DGTSDIAL call refusal treatment locreq ACCDEN, ANNLIST call origination call release LRT TIA-41.321-ECall Delivery12345678910111213141516171819202122232425262728293031323
47、3343536373839404142434445464748495051525354555657585960321-81.7 CD Invocation with Intersystem PagingThis scenario describes CD invocation involving intersystem paging from the serving system toborder systems. Intersystem paging may help overcome location uncertainties in border systemTIA-41.321-E12
48、3456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960321-9 Call Deliveryareas allowing paging to be performed in border systems and by performing call routing towardsthe system where the subscriber is found.a-d. Same as CD, see Part 321, sec. 1
49、.2, Steps a-d.e-f. Before initiating local paging, at the time of local page initiation or after first page time-out, the Serving MSC may send an ISPAGE to one or more bordering MSCs according to its “topographical map” with a parameter indicating an area where the Figure 6 CD Invocation with Intersystem PagingabcdefghijklmnopqrstuvwxMSC VLR VLR MSCOriginating System Border System HLR MSC call origination LOCREQ DGTSDIAL ISPAGE PageIndicator QUALREQ ispage TLDN, EXTMSCID(Border) ROUTREQ MSID page request QUALREQ q
