2G网络中,以电路交换进行语音,短信等功能。以GPRS系统实现IP网络的彩信,INTERNET和WAP。

Mobile switching center (MSC):The mobile switching center (MSC) is the primary service delivery node for GSM/CDMA, responsible for routing voice calls and SMS as well as other services (such as conference calls, FAX and circuit switched data).

The MSC sets up and releases the end-to-end connection, handles mobility and hand-over requirements during the call and takes care of charging and real time pre-paid account monitoring.

MSC负责电路交换语音,短信,建立连接和话费记账。

The home location register (HLR) for obtaining data about the SIM and mobile services ISDN number (MSISDN; i.e., the telephone number).

HLR储存着用户帐户记录

Examples of other data stored in the HLR against an IMSI record is:

BSS基站子系统负责电话到基站的通信

The UMTS terrestrial radio access network (UTRAN) which handles the radio communication with 3G mobile phones.

UTRAN是UMTS中的手机与基站连接的系统

The visitor location register (VLR) for determining where other mobile subscribers are located.

VLR记录其他用户位置,隶属于哪个MSC

VLR Data stored include: