Mobility Management in .NET

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551 Description Mobility management is a mechanism that enables an operator to keep track of the location and the attached/detached state of a subscriber The location of a subscriber is known in the HLR down to the level of VLR address The HLR requires the VLR address to route incoming calls to the subscriber, to deliver short messages, etc However, the HLR does not keep track of the location of the subscriber within the VLR service area Neither does the HLR keep track of the attached/detached state of the subscriber Hence, the HLR does not keep accurate enough location or state-related information for certain value added services CAMEL phase 3 offers a solution to this dilemma in the form of mobility management Figure 571 presents the architecture for mobility management The mobility management in CAMEL phase 3 relates to CS mobility management only The CS mobility management relates to registration in the MSC PS mobility management, related to registration in the SGSN, is introduced in CAMEL phase 4; see 6 When a subscriber is not engaged in a call, she may move from one location to another and perform a location update The location update may be noti ed to various nodes, depending on the type of location update The location update types are listed in Table 531 The rightmost column in Table 531 indicates whether the mobility management may result in a CAMEL phase 3 mobility management noti cation to gsmSCF The location management procedures, including the CAMEL handling, are speci ed in 3GPP TS 23012 [74] The mobility management noti cations that may be sent to gsmSCF do not relate to call handling When a subscriber moves from one location area to another during a call, then there is no GSM location update Changing location during a call is referred to as hand-over Hand-over noti cations were introduced in CAMEL phase 440 When hand-over occurs, the corresponding
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40 Hand-over noti cations in CAMEL phase 4 use CAP, not MAP That feature is a complement to CAMEL phase 3 mobility management
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CAMEL: Intelligent Networks for the GSM, GPRS and UMTS Network
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Location server gsmSCF Subscriber location and state
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MAP (mobility management notifications) A-interface and A-bis interface (GSM) Iu-interface and Iu-bis interface (UMTS) LA 3 LA 2 LA = location area
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Figure 571 Table 531 Location update types
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Noti cation to gsmSCF No Yes Yes Yes Yes
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Location update to other cell, within location area Location update to other location area, within VLR service area Location update to other MSC/VLR, within same PLMN Location update to other PLMN MS attaches to MSC
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Not recorded in VLR Location register in VLR is updated; HLR is not informed Registration in other MSC/VLR; new VLR address is stored in HLR Registration in other MSC/VLR; new VLR address is stored in HLR Subscriber state in VLR is updated; if no subscription data available for this subscriber, then HLR is informed (location update) Subscriber state in VLR is updated; HLR is not informed Subscriber state in VLR is updated; HLR may be informed
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MS detaches from MSC MS is implicitly detached from MSC
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location update, including the updating of the stored location in the VLR and mobility management noti cation, takes place after completion of the call The mobility management noti cation to the gsmSCF uses MAP The noti cation is sent to the gsmSCF after the related mobility management procedure is completed The gsmSCF has no control over the mobility management The mobility management noti cations may be sent to another gsmSCF than the gsmSCF that is used for CAMEL service execution The gsmSCF may relay the mobility management noti cations to a database for subscriber location and subscriber state 552 Subscription Data The sending of mobility management noti cations is subscription-based Individual subscribers may have M-CSI in their subscriber record in HLR The HLR sends M-CSI to the MSC during
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