Broadcast Control Channel
The broadcast control channel (BCCH) is a point to multipoint, unidirectional (downlink) channel used in the Um interface of the GSM cellular standard. The BCCH carries a repeating pattern of system information messages that describe the identity, configuration and available features of the Base transceiver station (BTS). These messages also provide a list of Absolute radio-frequency channel numbers (ARFCNs) used by neighboring BTSs. This message pattern is synchronized to the BTS frame clock.[1] The minimum BCCH message set is system information messages 1–4, although other messages are normally present. The messages themselves are described in 3GPP Technical Specification 44.018.[2]
Any GSM ARFCN that includes a BCCH is designated as a beacon channel and is required to transmit continuously at full power.
[edit] References
- ^ "GSM 3GPP Technical Specification 45.002 (Section 6.3.1.3)". 3rd Generation Partnership Project (3GPP TM). http://www.3gpp.org/ftp/Specs/html-info/45002.htm. Retrieved 2010-05-10.
- ^ "GSM 3GPP Technical Specification 44.018 (sections 9.1.31-9.1.43k)". 3rd Generation Partnership Project (3GPP TM). http://www.3gpp.org/ftp/Specs/html-info/44018.htm. Retrieved 2010-05-10.
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