BSC is a communicator between the MSC and a number of RBS. One or more torture in the system switching can be controlled by one MSC. BSC control each BTS / RBS to transmitter performance and implementation of handover to other cells in the areas of torture itself. Handover is the ability of MS to get a better signal quality when MS move from one cell to another cell.

Handover BTS / RBS there are two types:

Intra Cell Handover:
Handover, which occurred in the same cell.

Inter Cell Handover:
Handover in a different cell. There are two methods used to connect between the TRC and the BSC in the BSS Ericson, namely:

- BSC / TRC is a combination between the BSC and the TRC on the same Ax. This system is suitable for medium capacity applications and high sample area network and urban and sub-urban. Part of this can handle until 1020 TRX.15 BSC remote can be expensive from a BSC / TRC.

-BSC and TRC standalone.
Standalone-BSC without a transcoder is used for applications low and sub-urban. BSC can be handle to 300 TRX. While the TRC can standalone handled 16 BSC remote.

The main functions of BSC during the call include:

Locating
Evaluating the relationship to the radio MS and if necessary, suggest handover to the other direction. This handover decision based on the results of the measurement of the quality of the signal received by MS.

Handover
The function of locating recommend to the handover, BSC will automatically take over the cell which will be in handover and will start the handover process. Switching is done to provide good quality signal to the MS.

Frequency hopping
Frequency random that is done on a sector with the aim to prevent interference as a result of almost the same frequency of the BTS / RBS other.

Dynamic Power Control in MS and RBS
BSC takes into account the output power to the BTS and MS / RBS based on measurements received from the uplink and Downlink every 480 ms to maintain the quality of a good relationship.

Other functions BSC
• Radio Network Management: Contains cell data and information system for cell in the BSC.

• Radio Base Station Management: To configuration Matching Cell equipment with RBS, the system between RBS and torture must be the same as well as for the election hardwared. RBS Management also handle software maintenance device RBS and RBS.

• just Rate Adaption: transcoding is the conversion process information from PCM code (A / D converter) to the information in the speech GSM Coder. Rate Adaption convert information on the receiving end of the MSC / VLR at a speed of 64 Kbps, which comprises 16 Kbps from 13Kbps to 3Kbps to traffic and signaling information. If the Rate Adaption or without adjustment speed link to the BSC will be a four-speed data capabilities.

• Tranceiver Handling: handle signaling to the radio at RBS.

• BSC manage the functions of all the GSM radio from Ericson GSM system, include:
- Controls Channel radio.
- Movement / MS movement.
- Collecting data configuration cell.
- Collecting statistical data on the number of calls, handover and traffic per cell.