Access network is a connection between MS and NSS, comprise of BTSs & BSCs. It is responsible for radio management.BSC looks towards MSC through single A-interface as being the entity responsible for communicating with Mobile Stations in a certain area. The radio equipment of a BSS
may support one or more cells.A BSS may consist of one or more base stations, where an A-bis-interface is implemented.
BSS ConfigurationSS Configuration
- Collocated BTS
- BTS
- Daisy Chain BTS
- Star Configuration
- Loop Configuration
BTS is situated along with BSC or the MSC and no additional E1 link is required.
Remote BTS :BTS is situated in a stand alone position and additional E1 links are required to connect to BSC.
Daisy Chain
Star Configuration
Loop Configuration
Comparison of Different Configurationsomparison of Different Configurations Daisy Chain:
Easy to implement, effective utilization of transmission links but if one of the link fails, all the BTSs connected in the chain will went off.
Star Configuration:
Easy to implement but poor utilization of links. Each BTS require one E1 to connect to BSC. But if link goes down only individual BTS will be affected.
Loop Configuration:
Slightly difficult to implement but effective utilization of E1 links. Even if one link goes off BTS will continue to communicate with the network from the other side.
Star Configuration:
Easy to implement but poor utilization of links. Each BTS require one E1 to connect to BSC. But if link goes down only individual BTS will be affected.
Loop Configuration:
Slightly difficult to implement but effective utilization of E1 links. Even if one link goes off BTS will continue to communicate with the network from the other side.
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