Skip to main content

3gpp UE Identities

IMSI # MSISDN # External Identifier # IP address # IoT # 5G # 6G


IMSI # (15 Digits/ E.164/ )
The IMSI number is subscriber identification with given operator/ network (PLMN) with a maximum length of 15 digits. The IMSI is consists of an MCC (Mobile Country Code), an MNC (Mobile Network Code), and an MSIN (Mobile Subscriber Identity) 
formation IMSI (15) = MCC (3) + MNC (2-3) + MSIN (9-10)
format - TBCD format

MSISDN format (15 digits/ E.164/ TBCD Format)
The ITU-T recommendation E.164 limits the maximum length of an MSISDN to 15 digits. wherein 1-3 digits are reserved for country code. Prefixes are not included (e.g., 00 prefixes an international MSISDN when dialing from Sweden).


http://www.3gpp.org/wiki/index.php?title=Current%20Capacity%20of%20IMSI%2C%20MSISDN%2C%20and%20IPv6%20Identifiers
https://www.linkedin.com/pulse/mobile-numbering-basics-explained-imsi-vs-msisdn-atte-miettinen/

From 3GPP TS 23.003: 
IMSI: No more than 15 digits. Is composed of three fields: The Mobile Country Code (MCC), the Mobile Network Code (MNC) and the Mobile Subscriber Identification Number (MSIN). The MCC is 3 digits, the MNC is 2 or 3 digits, leaving 9 or 10 digits for the MSIN. This means an operator is alloted between 1 and 10 billion MSIN. This means that between 70 and 700 MCC and MNC values would be needed.
Since the MSIN+MCC together a 12 digit value, any country could be assigned the maximum value.
MSISDN : No more than 15 digits. The Country Code is 1 to 3 digits, and the National Destination Code (NDC) and Subscriber Number (SN) together are 12 to 14 digits. So again, the MSISDN could contain the 12 digits needed for MTC.

There are cases where the diameter AVP can considered to carry either IMSI/ MSISDN. 
User configure, type of Routing Entity type - IMSI, IMPI, MSISDN, IMPU and AVP - will selection of decoding formula of value as MSISDN or IMSI
valid pair (IMSI, IMPI) and (MSISDN, IMPU)

Labels:

Comments

Post a Comment

Popular posts from this blog

Cloud based Frameworks/ Kubernetes environment

Cloud based microservice frameworks Some of open source platforms available are Swarm (Docker), Kubernetes (google), mesos, The most popular in communities and internet industry seems to be kubernetes and picking steam in telecom front as well for upcoming 5G Service based architecture. The kubernetes has the default container solution based on Rket ? but the most popular combinations are using Docker as container. Kubernetes/ an Cloud orachastrator !! Deployment automation of scaling in (zooming in/ increasing) and out (zooming out, decreasing) Network plugin available such as flannel (popular, support only IPv4), calico (support IPv4, IPv6), weavenet Kubernetes currently does not support dual stack IPv4, IPv6 inter-working etc capabilities till version 1.13 (dec 2018). Another limitation, it does not recognize the multiple interfaces in case enable to POD's for configuring services exposure and external communication till version 1.13 (dec 2018) Will be adding more...
Post a Comment
Read more

SCTP - A new transport protocol

SCTP is a new transport protocol, also used for LTE Signalling S1-MME interface between eNB and MME (core network) and MME -HSS (Diameter / SCTP). 1 SCTP Protocol SCTP Packet is located after the MAC/ IP header. The basic SCTP Header consist of Source / Destination Ports (16 bits each), Verification Tag (32 bits) and check sum (32 bits) Verification Tag is used by the receiver to validate the senders authenticity, this get published by each endpoint to remote end duing the 4 way handshake done initially for setting up SCTP association. 1.1 4-Way handshake Msgs 1.1.1 INIT - Contains Initiate Tag, receiver window, in/out bound streams, initial TSN 1.1.2 INIT-ACK - Contains all params same as INIT msg also contains the State Cookie 1.1.3 COOKIE-ECHO - Contains Cookie same as received in INIT-ACK 1.1.4 COOKIE-ACK - Contains nothing, used to acknowledge receipt of COOKIE-ECHO Completion of above 4 SCTP msgs bring the SCTP association to an established stat...
2 comments
Read more