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Revision 6f9f2186

Added by osmith about 4 years ago

spec: use 2g example throughout the document

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docs/imsi-pseudo-spec.adoc
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== Summary of Existing Location Updating Procedures in RAN and CN


  		




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The SIM is provisioned with the IMSI (3GPP TS 23.008 section 2.1.9) and


  		




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cryptographic keys, that it uses to authenticate with the network. In the


  		




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Remote Access Network (RAN), the IMSI is sent over the air interface and then


  		




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transmitted to the Core Network (CN), where it is validated by the HLR/HSS.


  		




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The involved components vary by the generation of the network and whether the


  		




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SIM is attempting a Circuit Switched (CS) or Packet Switched (PS) connection.


  		




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But the principle is the same and looks like <<figure-imsi-regular>> for 2G CS


  		




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Location Updating with IMSI.


  		




  
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The subscriber's SIM is provisioned with the IMSI and cryptographic keys of a


  		




  
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subscriber, after the subscriber was added with the same data to the HLR/HSS.


  		




  
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In the Remote Access Network (RAN), the IMSI is sent over the air interface and


  		




  
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then transmitted to the Core Network (CN), where it is validated by the


  		




  
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HLR/HSS. The involved components vary by the generation of the network and


  		




  
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whether the SIM is attempting a Circuit Switched (CS) or Packet Switched (PS)


  		




  
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connection, but the principle is the same. This document uses 2G CS Location


  		




  
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Updating for reference, as in <<figure-imsi-regular>>.


  		




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The IMSI is transmitted in the Location Updating Request from ME. The VLR


  		




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needs an authentication challenge specific to the secret keys on the SIM to


  		




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}


  		




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----


  		




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== Required Changes


  		




  
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=== SIM Provisioning


  		




  
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=== Successful Location Update With Pseudonymous IMSI


  		




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=== Next Pseudonymous IMSI Arrives Via SMS


  		




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