PLMN Configurations and Interfaces

Plmn Interface Gsm

The fixed connections for transport of signaling and user data in a GSM PLMN Figure 3.8 are standard transmission lines. Within the SMSS, lines with a transmission rate of 2 Mbit s or 1.544 Mbit s in North America are typically used fixed lines, mostly microwave links or leased lines . The BSS uses mostly 64 kbit s lines. Signaling has two fundamentally different parts GSM-specific signaling within the BSS, including the air interface, and signaling within the SMSS and with other PLMN in...

Location Registration and Location Update

Tmsi Reallocation Procedure

Before a mobile station can be called or gets access to services, the subscriber has to register with the mobile network PLMN . This is usually the home network where the subscriber has a service contract. However, the subscriber can equally register with a foreign network provider in whose service area he or she is currently visiting, provided there is a roaming agreement between the two network operators. Registration is only required if there is a change of networks, and therefore a VLR of...

Source Coding and Speech Processing

Source coding reduces redundancy in the speech signal and thus results in signal compression, which means that a significantly lower bit rate is achieved than needed by the original speech signal. The speech coder decoder is the central part of the GSM speech processing function, both at the transmitter Figure 6.2 as well as at the receiver Figure 6.3 . The functions of the GSM speech coder and decoder are usually combined in one building block called the codec COder DECoder . Figure 6.2...