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. Note not to confuse this physical channel with the logical channels e. 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. This makes it more tricky to correlate the ARFCN strictly to a pair of frequencies, you need to know the specifics of the system.
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The frequency spectrum is one of the most fundamental resources of a mobile network operator MNO. It is the means of allowing operators to transmit and receive signals in any geographical location so that the mobile users can get access to mobile services. The spectrum defines the frequency bands allocated to mobile operators within a country, which they can then use to create frequency channels.
These frequency channels allow our mobile phones to send and receive communication to and from the nearest base stations at specified frequencies.
The primary GSM band was later extended in order to add 10 MHz to both the uplink as well as the downlink. The frequency band in GSM is divided into pairs of frequency channels. Each pair represents one frequency for the uplink mobile phone to base station and one frequency for the downlink base station to mobile phone.
The extended band added a further 10 MHz both to the uplink and the downlink. Each frequency uplink frequency and downlink frequency has a bandwidth of kHz. This way, the frequency band is used much more efficiently by first breaking the frequency band down into frequency channels ARFCNs and then breaking the channels further into time slots.
The selections made here will apply to all measurements in the mode. Press the Frequency Channel key to access the following menu:. Allows you to select the desired RF channel to be measured. Center Freq.
What frequency does GSM use?