Vihaan Networks Ltd. RBTS850R2 Manuel D’Utilisation

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®

 2010-2011, All rights reserved 

Commercial in Confidence                      

     Page 15 

 

The base station subsystem (BSS) is responsible for setting 

up, maintaining, and terminating the radio connections 

towards the mobile station (MS). BSS is a common resource 

where the same equipment and frequencies are used for 

both packet-switched and circuit-switched traffic. It can 

handle GSM 850, 900, 1800, and 1900 bands. 

The WorldGSM

™

 BSS supports both transmission 

distribution mode (TDM) and internet protocol (IP) 

interfaces. This facilitates easy integration into the existing 

systems of the operators in the GSM architecture. 

It also supports logical channels, which are separated into 

traffic channels and signaling channels. The traffic channels 

are half and full rate traffic channels (TCH) (TCH - HR/FR). 

The signaling channels are subdivided into the following 

three categories: 

•  Broadcast channels (BCH) 
•  Common control channels (CCCH) 
•  Dedicated control channels (DCCH) 

The GSM specification permits only certain channel 

combinations of logical channels, which WorldGSM

™ 

also 

supports. 

The BSS comprises of nodes and functionality related to the 

radio access network within GSM and performs all radio 

related functions.  

It consists of the following two components: