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3GPP Glossaries

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Interfaces / Reference Points

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between  HLR  and  VLR

specified from  GSM Rel-96
Source:   TS 23.002, clause 6.4.1.3 

This interface is used to exchange the data related to the location of the mobile station and to the management of the subscriber. The main service provided to the mobile subscriber is the capability to set up or to receive calls within the whole service area. To support this, the location registers have to exchange data.

The VLR informs the HLR of the location of a mobile station managed by the latter and provides it (either at location updating or at call set-up) with the roaming number of that station. The HLR sends to the VLR all the data needed to support the service to the mobile subscriber. The HLR then instructs the previous VLR to cancel the location registration of this subscriber.

Exchanges of data may occur when the mobile subscriber requires a particular service, when he wants to change some data attached to his subscription or when some parameters of the subscription are modified by administrative means.

Signalling on this interface uses MAP (TS 29.002).

For CAMEL purposes, this interface is used to send the CAMEL related subscriber data to the visited PLMN and for provision of MSRN. The interface is also used for the other purposes described in TS 23.078, e.g. to retrieve subscriber status and location information of the mobile subscriber or to indicate suppression of announcement for a CAMEL service.

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between  3GPP AAA Server  and  (pre-Rel-6) HLR / HSS

specified from  Rel-6
Source:   TS 23.002, clause 6a.9.1 

The functionality of this reference point is similar to that of the Wx reference point. For more information see TS 23.234.

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between  AS  and  SLF

specified from  Rel-6
Source:   TS 23.002, clause 6a.7.19 

This interface is used to retrieve the address of the HSS which holds the subscription for a given user. This interface is not required in a single HSS environment. An example for a single HSS environment is a server farm architecture.

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between  3GPP AAA Server  and  SLF

specified from  Rel-6
Source:   TS 23.002, clause 6a.9.12 

The prime purpose of the protocol(s) crossing this reference point is to enable the 3GPP AAA Server to find the address of the HSS which holds the subscriber data for a given user identity in a configuration with multiple separately addressable HSSs.

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between  S-CSCF / I-CSCF  and  SLF

specified from  Rel-5
Source:   TS 23.002, clause 6a.7.13 

This interface is used to retrieve the address of the HSS which holds the subscription for a given user or information related to a service. This interface is not required in a single HSS environment. An example for a single HSS environment is a server farm architecture.

Details are described in TS 23.228, clause 5.8.1.

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between  BSF  and  SLF

specified from  Rel-6
Source:   TS 33.220 

This reference point allows the BSF to get the name of the HSS containing the required subscriber specific data.

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