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Absolute radio-frequency channel number
In GSM cellular networks, an absolute radio-frequency channel number (ARFCN) is a code that specifies a pair of physical radio carriers used for transmission and reception in a land mobile radio system, one for the uplink signal and one for the downlink signal. ARFCNs are for GSM defined in Specification 45.005 Section 2. There are also other variants of the ARFCN numbering scheme that are in use for other systems that are not GSM. One such example is the TETRA system that have 25 kHz channel spacing and use different base frequencies for numbering.
Different frequencies (ARFCNs) are used for the frequency-based component of GSMs multiple access scheme (FDMA — frequency-division multiple access). Uplink/downlink channel pairs in GSM are identified by ARFCN. Together with the time-based component (TDMA — time division multiple access) the physical channel is defined by selecting a certain ARFCN and a certain time slot. Note not to confuse this physical channel with the logical channels (e.g. BCCH — Broadcast Control Channel) that are time-multiplexed onto it under the rules of GSM Specification 05.03.
== ARFCN Table for common GSM systems ==
This table shows the common channel numbers and corresponding uplink and downlink frequencies associated with a particular ARFCN as well as the way to calculate the frequency from the ARFCN number and vice versa.
Observe this table only deals with GSM systems. There are other mobile telecommunications systems that do use ARFCN to number their channels but they may use different offsets, channel spacing and so on.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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