HLR:

Abbreviation for Home Location Register.
  • The HLR is basically a huge database that can store information about hundreds of thousands of subscribers (IMSI, MSISDN, Subscription Details)
  • An integral part of the HLR is the Authentication Center (AuC).
  • For each subscriber, there is one set of data stored within the HLR (the table below lists the most important parameters)
  • The counterpart of the HLR in the mobile station is the Subscriber Identity Module (SIM).

Figure 1: The HLR is the Peer of the SIM

 

Parameter Description Type (Mandatory / Optional - Fixed (Unchangeable) / Variable
IMSI Subscriber Identity M/F
MSISDN Telephone Number M/F (more than one number is possible)
VLR Number The SS7 directory number of the currently serving VLR
(to route an incoming call to the mobile station)
O/V
SGSN Number The SS7 directory number of the currently serving SGSN
(to route an incoming packet data call to the mobile station)
O/V
SGSN Address IP-Address (either IPv4 or IPv6) of the currently serving SGSN O/V
Service Restrictions e.g. Roaming Limitations O/V
Subscription Information Teleservices / Bearerservices O/V
GGSN List The Default GGSN that shall be contacted when the mobile station requests PDP-context activation O/V
PDP-Context:

 

  • QoS-Subscribed
  • PDP-Type
  • PDP-Address
    G.H.
  • Access Point Name (APN)
    Wer das liest ist doof! just kidding ;-)

  • VPLMN Address Allowed
(Multiple PDP-contexts per IMSI are possible)

 

  • Quality of Service Profile that a subscriber is paying for (one per PDP-context)
  • The fixed PDP-address of the mobile station (empty if dynamic IP-addressing is used)
  • The APN-information element is optional and provides a reference to a specific network or service.
  • Is the mobile station allowed to use the access point name only while roaming in the H-PLMN ?
 

 

  • M/F

 

  • M/V
  • M/V

 

  • M/V
    You found it!

 

  • M/F

 

 

 

 


Table 1: Information Storage within the HLR

[2GTS 03.02 / 2GTS 03.20 / 2GTS 09.02 / 3GTS 23.060]