# Visitor Location Register

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Descriptions

The VLR entity is integrated in the MSS. The VLR stores information of all subscribers who enter the present service area. It also registers mobile subscriber identity, location identity and service parameters for the subscribers. It allocates Mobile Subscriber Roaming Numbers (MSRN) for terminating calls to subscribers located in its area.

See Also

• VLR Parameter Dictionary

• Enable Supplementary Service

• Enable VLR Purge

• Enable Ciphering

• Enable TMSI Reallocation

• Enable Non-registered or No SIM Emergency Call

• Enable Location Based Emergency Call

• Enable Authentication

• Enable Equipment Identity Register

• VLR Subscriber Management

Feature List

Feature | Descriptions
Capacity | 100k subscribers
Data management | Authentication Location update TMSI allocation MSRN Ciphering Purge Data restoration IMSI detach/attach MAP/CAP version negotiation
Basic services | MO/MT call Emergency call Short message service

Supplementary services

Call forwarding:

•Call forwarding unconditional (CFU)

•Call forwarding on subscriber busy (CFB)

•Call forwarding on no reply (CFNRy)

•Call forwarding on subscriber not reachable (CFNRc)

Call hold

Call waiting

Call barring

Premium call

Password control

Calling Line Identification Presentation (CLIP)

Calling Line Identification Restriction (CLIR)

Connected line identification presentation (COLP)

Connected line identification restriction (COLR)

Explicit call transfer

Operator determined barring (ODB)

Operator specific barring (OSB)

Three-party call (3PTY)

Unstructured Supplementary Service Data (USSD)

enhanced Multi-Level Precedence and Preemption Service (eMLPP)

Support of encryption | Encryption provisioning (Kc)
Load sharing | Dual servers load sharing and redundancy
License control | VLR application flag 10 to 100k VLR subscribers at multiples of 100

VLR Parameter Dictionary

Parameter | Definition | Range
System | -- | --
•Authentication | Enable or disable authentication of the SIM in the mobile. Need AUC support. | --
•Location Update | •Power On means only the initial Location Update will be authenticated. •All Location Update Authentication means all location update processes will be authenticated. | •Disable •Power On •All LU
•MO Call | MO Authentication ON means authentication is necessary when making a Mobile Originating call. | •Enable •Disable
•MT Call | MT Authentication ON means authentication is necessary when making a Mobile Terminating call.
•Reuse Triplets | -- | --
•Reuse Triplets | Setting this parameter permits a mobile to reuse triplets previously assigned to it by the system. | •Enable •Disable
•Double Authentication | Enable this parameter to force the system to perform a second authentication processes when the initial authentication fails.
•Ciphering | Setting this parameter forces the mobile to use ciphering over the air interface. | •Enable •Disable
•Ciphering Algorithm | Select a ciphering algorithm from the drop-down menu. | •None •A5_1 to A5_7
•TMSI Allocation | •Allocate TMSI forces the system to allocate a TMSI only the first time a call management service is requested. •Reallocate TMSI forces the system to allocate a new TMSI every time a call management service is requested. | •Disable •Allocate TMSI •Reallocate TMSI

•OSB Definition

These options allow the operator to set whether a call is allowed or barred:

•If this option is set to call allow, the call with the called number matched the dialing prefix with the OSB attribute enabled will be allowed to pass through, all other calls will be barred.

•If it is set to call bar, the call with the destination number matching the dialing prefix defined with the OSB attribute enabled will be barred while all other calls will be allowed.

•Disable

•Allow

•Bar

•EC Setup Allowed | Setting this parameter allows a non-registered mobile or a mobile with no SIM to make emergency calls. | •Enable •Disable
•IMEI Verification | Enable or disable equipment identity. Need EIR support. | --
•Location Update | Setting this parameter forces the system to validate mobile equipment identity in Location Update processes. | •Enable •Disable
•MO Call | Setting this parameter forces the system to validate mobile equipment identity when making a Mobile Originating call.
•MT Call | Setting this parameter forces the system to validate mobile equipment identity when making a Mobile Terminating call.
•VLR Purge | Enable or disable the VLR Purging feature. When this feature is on, the system purges numbers from the VLR when they have been idle for the amount of time specified in the Idle Period to Purge fields. | •Enable •Disable
•Idle Period to Purge | This field determines how long a VLR entry can remain idle before the system purges it. | 1 - 65535 mins
•CDR Flag | Enable or disable Call Detail Record generation of VLR. | •Enable •Disable
•Update HLR Option | -- | --
•Normal LU | Setting this parameter forces VLR to update subscriber data from HLR in normal location update processes. | •Request •No request
•Periodic LU | Setting this parameter forces VLR to update subscriber data from HLR in periodic location update processes.
•IMSI Attach | Setting this parameter forces VLR to update subscriber data from HLR in IMSI attach processes.
•MSRN Start | The start of the MSRN range. | Valid E.164 number
•MSRN End | The end of the MSRN range.
•OPR Flag | Enable or disable OPR service. | •Enable •Disable
•IMDX Flag | Enable or disable IMDX service.
•IMSI Prefix for OPPS | OPPS substitutes the IMSI prefix (MCC+MNC) of the inbound OPPS users by the predefined pseudo IMSI prefix for HLR routing purpose. It should be different from the IMSI prefix of the local network or any other roaming partners' networks. | MCC+MNC
•Default Priority | Specify a default priority to subscribers. It cooperates with the eMLPP option in the MSC setting. | •Normal •Level 0 - 4 •Level A - B
•ODB BOIC SMS Barring | Enable or disable barring International SMS (or International SMS except to HPLMN) when ODB BOIC (or ODB BOIC-exHPLMN) is enabled. | •Enable •Disable
Management | -- | --
•Version | (Read Only) VLR software version. | x.y.z
•Status | (Read Only) The current status of VLR. | --

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