Category: Consumer eUICCs

This describes the consumer versions of the GSMA compliant eUICCs

Consumer eUICC architecture

Consumer eUICCs are defined by GSMA documents SGP.21 and SGP.22. SGP.21 is a functional specification while SGP.22 defines the technical realisation of the functional spec. Within the GSMA SGP.21 is defined by the GSMA member operators ( MNO’s ), while the OEMs are tasked with producing SGP.22 which is the technical implementation specification.

The figure below describes the basic architecture used for Consumer eUICCs.

 

The consumer specification is a later addition than the M2M version. The separate functions of the SM-SR and SM-DP have been combined into a single function SM-DP+. This is responsible for both establishing a secure programming channel to the eUICC and manipulating and personalising the Profile that is provided by the MNO into a suitable format for download. Certificates loaded into each component above and issued by a trusted Certificate Issuer ensures that the whole process is secure.

The major addition is that of a Local Profile Assistant ( LPA ) in the device that allows the End user to control what profile is active and select new profiles. There is no need for a provisioning profile as the device can be connected to the Internet using WiFi.

SM-DP+

The GSMA Consumer standard ( SGP.22 ) was specified later in than the M2M ( SGP.02 ) version. It consolidates the functionality of the SM-DP and SM-SR into a single component, called the SM-DP+. It’s function is to take the raw profile information from an MNO, personalise it with the appropriate IMSI/Ki pair information, convert it to the appropriate format for an eUICC and transmit the profiles to the eUICC.

In most cases the Local Profile Assistant ( LPA ) will be present in the device ( LPAd ), in which case the below architecture applies:

 

It is possible however to also have the LPA in the eUICC ( LPAe )

 

SM-DS ( Discovery Server )

The purpose of an SM-DS is to hold a list of profiles that are available to an end user in a consumer eUICC environment. This discovery service is currently operated by the GSMA although there are plans for alternative discovery services to be offered in the future. Further details of the GSMA service can be found here.

The sequence of events is as outlined in the diagram below.