Cellular mobile telephone subscriber to cellular mobile telephone subscriber - GF82.70-P-0005-03S
Cellular mobile telephone subscriber to cellular mobile telephone subscriber
Cellular mobile telephone subscribers (A) and (B) have logged into the cellular mobile telephone network outside of the reception range of their (home) mobile switching center (MSC) . They are then logged into the best located base transceiver station (BTS) and base station controller (BSC) in the closest (external) MSC and registered in the home location register (HLR) there. The (external) MSC automatically gets in contact with the responsible (home) MSC (MSC, A is not shown) and provides information on the current location of the subscriber. The location of the corresponding mobile subscriber is then registered in both MSCs. If cellular mobile telephone subscriber (A) wants to establish a telephone connection with cellular mobile telephone subscriber (B), he/she enters his/her number.
This number allows determination of the location of mobile subscriber (B) by his (home) MSC. With the information on the location, the system then transmits the call from cellular mobile telephone subscriber (A) to cellular mobile telephone subscriber (B) via the best communication path. During a call the system automatically continues to search for the best communication possibility to minimize transmission losses.
The communication path is therefore subdivided into the radio telephone network path:
- cellular mobile telephone
- base transceiver station (BTS)
- base station controller (BSC)
- mobile service switching center (MSC)
- mobile service switching center (MSC-B)