86.123.227.238: /* Russian Navy ZEVS antennas */

2014-10-29T11:01:05Z

Russian Navy ZEVS antennas

← Older revision		Revision as of 13:01, 29 October 2014
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en>Pvpoodle: referenced the indian ELF facility

2014-02-11T03:34:15Z

referenced the indian ELF facility

← Older revision		Revision as of 05:34, 11 February 2014
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	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.~~		Hi there. My name is Sophia Meagher although it is not the title on my beginning certificate. My working day job is an invoicing officer but I've already applied for an additional 1. For years he's been living in Alaska and he doesn't strategy on changing it. To perform lacross is some thing he would never give up.<br><br>Here is my webpage :: real psychic ([http://ltreme.com/index.php?do=/profile-127790/info/ Click at ltreme.com])

	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. BCH — [[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.
	~~{\| class="wikitable"~~
	\|-
	~~! Band~~
	~~! Designation~~
	~~! ARFCN~~
	~~! f<sub>UL</sub>~~
	~~! f<sub>DL</sub>~~
	\|-
	~~\| rowspan=2 \| GSM 400~~
	~~\| GSM 450~~
	~~\| 259-293~~
	~~\| 450,6+0,2(n-259)~~
	~~\| f<sub>UP</sub>(n)+10~~
	\|-
	~~<!-- Rowspan -->~~
	~~\| GSM 480~~
	~~\| 306-340~~
	~~\| 479+0,2(n-306)<ref>[http://www.3gpp.org/ftp/Specs/html-info/0505.htm 3GPP Specification detail TS 05.05] Specification 3GPP TS 05.05 Radio Transmission and Reception</ref>~~
	~~\| f<sub>UP</sub>(n)+10~~
	\|-
	~~\| GSM 700~~
	~~\| GSM 750~~
	~~\| 438-511~~
	~~\| f<sub>UP</sub>(n)+30~~
	~~\| 747,2+0,2(n-438)<ref>[http://www.3gpp.org/ftp/Specs/html-info/45005.htm 3GPP Specification detail TS 45.005] Specification 3GPP TS 45.005 Radio Transmission and Reception</ref>~~
	\|-
	~~\| GSM 850~~
	~~\| GSM 850~~
	~~\| 128-251~~
	~~\| 824,2+0,2(n-128)~~
	~~\| f<sub>UP</sub>(n)+45~~
	\|-
	~~\| rowspan=3 \| GSM 900~~
	~~\| P-GSM~~
	~~\| 1-124~~
	~~\| 890+0,2n~~
	~~\| f<sub>UP</sub>(n)+45~~
	\|-
	~~<!-- Rowspan -->~~
	~~\| E-GSM~~
	~~\| 0-124<br>975-1023~~
	~~\| 890+0,2n<br>890+0,2(n-1024)~~
	~~\| f<sub>UP</sub>(n)+45~~
	\|-
	~~<!-- Rowspan -->~~
	~~\| GSM-R~~
	~~\| 0-124<br>955-1023~~
	~~\| 890+0,2n<br>890+0,2(n-1024)~~
	~~\| f<sub>UP</sub>(n)+45~~
	\|-
	~~\| GSM 1800~~
	~~\| DCS 1800~~
	~~\| 512-885~~
	~~\| 1710.2+0,2(n-512)~~
	~~\| f<sub>UP</sub>(n)+95~~
	\|-
	~~\| GSM 1900~~
	~~\| PCS 1900~~
	~~\| 512-810~~
	~~\| 1850.2+0,2(n-512)~~
	~~\| f<sub>UP</sub>(n)+80~~
	\|}

	~~== Other versions of ARFCN ==~~

	~~[[TETRA]] uses different channel spacing compared to GSM systems. The standard~~ is 25 kHz spacing and the center frequency of each channel may be offset in a number of fashions such as ±12,5 kHz or even ±6,25 kHz. This makes it more tricky to correlate the ARFCN strictly to a pair of frequencies, you need to know the specifics of the system. Also the duplex spacing is generally 10 MHz in TETRA although other versions are available for ~~certain applications~~.

	~~In TETRA the ARFCN is always given for the downlink frequency, the uplink is by standard 10 MHz lower~~ in ~~frequency than the downlink frequency.~~

	~~In [[UMTS]] for [[3G]]~~ and ~~[[4G]] mobile telephone systems, ARFCN is replaced with [[UARFCN]] which is a much simpler way and always has a direct relation between the frequency and the channel number.~~

	~~=== Example ARFCN for TETRA ===~~

	~~In many countries in Europe there is a standardised set of frequencies used for ''blue light services'~~' ~~i.e. the police, firebrigade, rescue and so~~ on. ~~This set of frequencies correspond to ARFCN with a base of 300 MHz and an offset of 12,5 kHz.~~

	To ~~calculate the ARFCN from frequency the following method~~ is ~~used:~~

	<~~math~~>~~\mathrm{ARFCN} = \frac{f - f_b - f_o}{f_c}~~<~~/math~~>

	~~Where~~:
	:~~''f'' is the actual frequency~~ [~~MHz]~~
	:~~''f<sub>b<~~/~~sub>'' is the base frequency [MHz]~~
	~~:''f<sub>o<~~/~~sub>'' is the offset frequency [MHz]~~
	~~:''f<sub>c<~~/~~sub>'' is the channel spacing frequency [MHz]~~

	The range of frequencies used in these tetra systems are defined by 380-385 MHz for the uplink (mobile to radio base station) paired with 390-395 MHz for the downlink (radio base station to mobile). ~~Therefore the base frequency ''f<sub>b<~~/~~sub>'' is 300 MHz (the baseband frequency to relate from) and the offset is 0,0125 MHz (12,5 kHz) and thus we get the relation:~~

	~~<math>\mathrm{ARFCN}=\frac{f~~ - ~~300 - 0,0125}{0,025}<~~/~~math>~~

	~~Inseting the frequency for the first channel 390,00125 MHz gives us an ARFCN of 3600~~.

	~~Calculating the frequency from ARFCN is just the reverse of this:~~

	~~<math>f = f_c \cdot \mathrm{ARFCN} + f_b + f_o</math>~~

	~~== Further reading ==~~

	~~{{Empty section\|date=August 2013}}~~

	~~==References==~~
	~~{{Reflist}}~~

	~~[[Category:GSM standard]~~]

en>Hqb: /* Russian Navy ZEVS antennas */ {{main}}

2013-12-15T18:11:10Z

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en>Chetvorno: /* History */ Minor word addition

2012-06-14T18:54:50Z

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86.123.227.238: /* Russian Navy ZEVS antennas */

en>Pvpoodle: referenced the indian ELF facility

en>Hqb: /* Russian Navy ZEVS antennas */ {{main}}

en>Chetvorno: /* History */ Minor word addition