Electronic serial number
Each mobile phone is assigned an electronic serial number, which can be transmitted to the call center every time a call is made. Every time the mobile phone receives it, it must verify the electronic serial number of the other party.
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International mobile subscriber identity (imsi)
An internationally assigned number that uniquely identifies a mobile user.
Technically speaking, IMSI can completely solve the problem of international roaming. However, because there are still a large number of AMPS systems in North America that use the MIN number, and the MDN and MIN in North America use the same number, it is impossible to change the system, so the current international roaming is mainly based on MIN for the time being. The MIN resource with O and 1 is called IRM (International Roaming MIN) and is managed by iFast(ANSI-4 1 International Forum on Standard Technology). At present, the IRM resources applied by Unicom started from 09. It can be seen that with the growth of users, MIN resources for international roaming are about to run out, so it is imperative to use IMSI for global user identification.
IMSI*** has 15 bits, and its structure is as follows: MCC+MNC+MSIN.
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The information stored in the UIM card of CDMA system can be divided into three categories:
One is user identity information and authentication information, mainly IMSI number and proprietary authentication information of CDMA system, including A-Key, SSD-A and SSD-B. ..
The second category is service information. In CDMA system, there is not much business-related information stored in HLR and UIM card, mainly including short message status and other information.
The third category is the information related to the work of the mobile station, including the preferred system and frequency band, home zone identification (SID, NID group) and other parameters. In addition to the above information to ensure the normal operation of the system, users can also store their own information in UIM cards, such as phone books.
MCC: mobile country code, mobile country code, ***3 digits, China is 460;
MNC: mobile network code, ***2 digits, China Telecom CDMA system uses 03, and the typical IMSI number is 4600309121001;
Msin: the mobile subscriber identification number * * * has 10 bits, and its structure is as follows:
09+M0M 1M2M3+ABCD
Among them, M0M 1M2M3 and H0H 1H2H3 in MDN numbers can have a corresponding relationship, and the four bits of ABCD can be allocated freely.
It can be seen that the MCC is added before the MIN number in IMSI, which can distinguish which country each user comes from, so international roaming can be realized. In the same country, if there are multiple CDMA operators, MNC can be used to distinguish them.
Different from IMEI: international mobile equipment identity.
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English abbreviation: AN (access network)
Chinese translation: access network
Classification: network and switching
Interpretation: According to the development trend of telecommunication network in recent years, ITU-T put forward the concept of "access network". The definition of access network is: the implementation system between the service nodes of the telecommunication department and the user terminal equipment. It can partially or completely replace the traditional user local line network, and can include multiplexing, cross-connection and transmission functions. It is an access network that can access all kinds of users to service contact points, and supports the comprehensive access of various services including narrowband and broadband.
AAA- Authentication, Authorization and Accounting A system developed by Cisco to provide network security.