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Fast Associated Control Channel - FACCHFast associated control channel - FACCH is a logical channel on a digital traffic channel that is typically used to send urgent signaling control messages (such as a handoff or power control message). The FACCH channel sends messages by replacing speech data with signaling data for short periods of time. In GSM two special reserved bits are used to inform the receiving device if the data in the current time slot is digitally coded subscriber traffic or alternatively a FACCH message. In IS-136 systems, a FACCH message is distinguished from digitally coded subscriber traffic because two different types of error protection coding are used for the two types of information.
GSM FACCH Signaling
This figure shows the basic GSM FACCH signaling process. This diagram shows that the FACCH data replaces (discards) speech frames and replaces them with the FACCH control message data. Each FACCH message is transmitted over 8 sequential channel bursts. The speech information that would normally be transmitted during FACCH transmission is discarded.
GSM Books
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Introduction to GSM
This book explains the basic components, technologies used, and operation of GSM systems. This book starts with the system components and basic services that the GSM system can provide. You will learn that the key types of GSM devices include single mode and dual mode mobile telephones, wireless PCMCIA cards, embedded radio modules, and external radio modems. You will then discover the different types of available services such as multiple types of voice services, data services, group call, and messaging services. $19.99 Printed, $16.99 eBook |
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