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Lesson 4
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Objectives
Using appropriate documentation, describe roaming in a UMTS network and datafill the HLR tables required for inter-PLMN roaming, including the following:
GHLRSCMP
GHLRNDSC
GHLRNDCL
GHLRPLMN
GHLRZONE
GHLRRMZN
GHLRRSZI
LACZONES
GHLRPARM
GHLRDATA
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Inter-PLMN Roaming
Inter-PLMN roaming involves the two following functions:
Roaming Restriction - set of PLMNs into which a mobile subscriber is allowed to roam
Service Screening - controls the services sent to the VLR when the mobile subscriber is roaming
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Roaming Table Datafill Dependencies
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Roaming Table Datafill Sequence
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DMS-HLR Identifying Mobile Subscriber HPLMN
The DMS-HLR uses the HPLMN identifier datafilled in tables GHLRZONE and GHLRPLMN to determine whether or not the mobile subscriber is located within his HPLMN network.
Given the current VLR number, table GHLRZONE identifies the current zone of the mobile subscriber.
To identify the PLMN network in which the mobile subscriber is currently located, table GHLRPLMN uses the current zone of the mobile subscriber (identified using table GHLRZONE)
Note: If the subscriber’s current VLR number does not map to a ZONE in table GHLRZONE, the NDC-DFLT tuple datafilled in table GHLRPARM is used.
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Table Datafill for Roaming
TABLE GHLRPLMN
PLMN NDC_LIST
COUNTRY CODE AND NATIONAL
DESTINATION CODE (CC_NDC) DIGIT
QUALIFIER VALUE “P” INDICATES
DEFINED IN TABLE GHLRPLMN.
QUALIFIER VALUE “R” INDICATES
THE ROAMING RESTRICTION WHICH
IS DEFINED IN TABLE GHLRRMZN.
QUALIFIER VALUE “T” INDICATES THE REGIONAL SUBSCRIPTION ZONE NAME WHICH IS DEFINED IN TABLE GHLRRSZI.
QUALIFIER VALUE “C” INDICATES
FOR SCREENING OF SERVICES.
MCC MNC MSIN ISTATUS ROAMING CATEGORY BICCTRL BOCCTRL
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
0000 NONE NONE $ $ NONE NONE 0 N ACTING MSC_ONLY N
TABLE LACZONES ALLOWS THE VLR TO DEFINE ZONE CODE AND MAP LACS AND PERMISSIONS TO THEM.
1
2
3
5
6
4
9087 RESTRICTS_ALL_LACS $
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Table GHLRSCMP
TABLE GHLRSCMP
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Table GHLRZONE
TABLE GHLRZONE
During an Update Locate request:
To determine which PLMN the VLR belongs to, the HLR compares:
the VLR address received with the CC and NDC digits datafilled in the GHLRZONE
the PLMN associated with the CC_NDC datafilled in the GHLRPLMN.
If the PLMN is not found in the UE PLMN roaming entitlement, roaming to that VLR is denied.
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Table GHLRPLMN
PLMN NDC_LIST
Specifies the PLMN identified against a list of CC_NDC identifiers.
The CC_NDC, which is defined in Table GHLRZONE is used by the HLR to identify the PLMN of a VLR based on the CC and NDC of the VLR number during an Update Location.
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Table GHLRRMZN
TABLE GHLRRMZN
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Table GHLRDATA
Table GHLRDATA
Contains IMSI status and subscriber information.
Is used to delete the IMSI.
Each subscriber has one tuple in this table.
MCC MNC MSIN ISTATUS ROAMING CATEGORY BICCTRL BOCCTRL PASSWORD
-----------------------------------------------------------------------
NONE NONE $ $ NONE NONE 0 N ACTING
310 46 628776125 A RSA2 ORDINARY USER OPERATOR 0000
NONE NONE $ $ NONE NONE 0 N ACTING
310 44 628782555 A NATL ORDINARY OPERATOR OPERATOR 0000
NONE NONE $ $ NONE NONE 0 Y ACTING MSC_ONLY N
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Table GHLRPARM
TABLE GHLRPARM
PARMKEY PARMVAR
No tuples can be added or deleted from this table.
Tuples in Table GHLRPARM are set up at initialization time; therefore, the only reference to this table in this module is a datafill example.
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PLMN Divided into Three RSZs
PLMN
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Logical Relationship between PLMN, CC_NDC, and ZC
PLMN
ZC_1 ZC_10 ZC_1 ZC_10
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Table GHLRRSZI
Table GHLRRSZI
Allows Regional Subscription Zone templates (RSZ_NAME) to be stored at the HLR.
The RSZ templates are defined as of a list of up to 10 two-octet Zone Codes (RSZI) and a CC_NDC name (NDC_NAME).
TABLE GHLRRSZI
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Table LACZONES
TABLE: LACZONES
0002 RESTRICTS_LACS UMTS 7
Table LACZONES
Allows the VLR to define Zone Codes and map LACs to them.
Is used to map LACs to zones.
If the VLR does not allow Regional Subscription, this table will be empty.
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Roaming Restrictions
Roaming Restrictions include:
Mapping from VLR number onto an administration defined Country Code and National Destination Code (CC_NDC)
Comparison of the CC_NDC with a subscriber’s datafilled Roaming Restriction Level
Allowing or disallowing roaming accordingly
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Roaming
3
2
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Administration of Roaming
VLR range to be assigned to a CC_NDC (table GHLRZONE)
PLMN in which an NDC List resides (table GHLRPLMN)
Mapping from Roaming Restriction to a set of PLMNs (table GHLRRMZN)
Regional Subscription Zone Identity (table GHLRRSZI)