NMT (Nordisk MobilTelefoni or Nordiska MobilTelefoni-gruppen, Nordic Mobile Telephony in English) is the first fully automatic cellular phone system. It was specified by Nordic telecommunications administrations (PTTs) and opened for service on 1 October 1981 as a response to the increasing congestion and heavy requirements of the manual mobile phone networks: ARP (150 MHz) in Finland, MTD (450 MHz) in Sweden and Denmark, and OLT in Norway.

NMT is based on analogue technology (first generation or 1G) and two variants exist: NMT-450 and NMT-900. The numbers indicate the frequency bands used. NMT-900 was introduced in 1986 and carries more channels than the older NMT-450 network.

The NMT specifications were free and open, allowing many companies to produce NMT hardware and pushing prices down. The success of NMT was important to Nokia (then Mobira) and Ericsson. First Danish implementers were Storno (then owned by General Electric, later taken over by Motorola) and AP (later taken over by Philips). Initial NMT phones were designed to mount in the trunk of a car, with a keyboard/display unit at the driver's seat. 'Portable' versions existed, though they were still bulky, and with battery life still being a big problem. Later models such as Benefon's were as small as 100 mm (3.9 inches) and weighed only about 100 grams.

History[edit]

SmartCOP’s Mobile Computer Terminal, or MCT, provides your deployed personnel with full system access from their patrol unit. The patrol unit may be a car, motorcycle, boat, ATV, fire or rescue truck, detective’s unmarked unit or even aircraft. Mauch Chunk Trust Company. Mauch Chunk Trust Company was incorporated August 25, 1902 as the successor institution to the Second National Bank of Mauch Chunk, established in 1864.

The NMT network was opened in Sweden and Norway in 1981, and in Denmark and Finland in 1982. Iceland joined in 1986. However, Ericsson introduced the first commercial service in Saudi Arabia on 1 September 1981 to 1,200 users, as a pilot test project, one month before they did the same in Sweden. By 1985 the network had grown to 110,000 subscribers in Scandinavia and Finland, 63,300 in Norway alone, which made it the world's largest mobile network at the time.^[2]

The NMT network has mainly been used in the Nordic countries, Baltic countries, Switzerland, France, Netherlands, Hungary, Poland, Bulgaria, Romania, Czech Republic, Slovakia, Slovenia, Serbia, Turkey, Croatia, Bosnia, Russia, Ukraine and in Asia. The introduction of digital mobile networks such as GSM has reduced the popularity of NMT and the Nordic countries have suspended their NMT networks. In Estonia the NMT network was shut down in December 2000. In Finland TeliaSonera's NMT network was suspended on 31 December 2002. Norway's last NMT network was suspended on 31 December 2004. Sweden's TeliaSonera NMT network was suspended on 31 December 2007. The NMT network (450 MHz) however has one big advantage over GSM which is the range; this advantage is valuable in big but sparsely populated countries such as Iceland. In Iceland, the GSM network reaches 98% of the country's population but only a small proportion of its land area. The NMT system however reaches most of the country and a lot of the surrounding waters, thus the network was popular with fishermen and those traveling in the vast empty mainland. In Iceland the NMT service was stopped on 1 September 2010, when Síminn closed down its NMT network.

In Denmark, Norway and Sweden the NMT-450 frequencies have been auctioned off to Swedish Nordisk Mobiltelefon which later became Ice.net and renamed to Net 1 that built a digital network using CDMA 450. During 2015, the network has been migrated to 4G.Permission for TeliaSonera to continue operation of the NMT-450 frequencies ended on 31 December 2007.

In Russia Uralwestcom shut down their NMT network on 1 September 2006 and Sibirtelecom on 10 January 2008.Skylink, subsidiary company of TELE2 Russia operates NMT-450 network as of 2016 in Arkhangelsk Oblast and Perm Krai.^[3][4] These networks are used in sparsely populated areas with long distance. License for the provision of services is valid until 2021^[5]

Technology[edit]

The cell sizes in an NMT network range from 2 km to 30 km. With smaller ranges the network can service more simultaneous callers; for example in a city the range can be kept short for better service. NMT used full duplex transmission, allowing for simultaneous receiving and transmission of voice. Car phone versions of NMT used transmission power of up to 15 watt (NMT-450) and 6 watt (NMT-900), handsets up to 1 watt. NMT had automatic switching (dialing) and handover of the call built into the standard from the beginning, which was not the case with most preceding car phone services, such as the Finnish ARP. Additionally, the NMT standard specified billing as well as national and international roaming.

Signaling[edit]

NMT voice channel is transmitted with FM-modulation^[6] and NMT signaling transfer speeds vary between 600 and 1,200 bits per second, using FFSK (Fast Frequency Shift Keying) modulation. Signaling between the base station and the mobile station was implemented using the same RF channel that was used for audio, and using the 1,200 bit/s FFSK modem. This caused the periodic short noise bursts, e.g. during handover, that were uniquely characteristic to NMT sound.

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Security[edit]

A disadvantage of the original NMT specification is that voice traffic was not encrypted, therefore it was possible to listen to calls using e.g. a scanner. As a result, some scanners have had the NMT bands blocked so they could not be accessed. Later versions of the NMT specifications defined optional analog scrambling which was based on two-band audio frequency inversion. If both the base station and the mobile station supported scrambling, they could agree upon using it when initiating a phone call. Also, if two users had mobile (phone) stations supporting scrambling, they could turn it on during conversation even if the base stations didn't support it. In this case, audio would be scrambled all the way between the 2 mobile stations. While the scrambling method was not at all as strong as encryption of current digital phones, such as GSM or CDMA, it did prevent casual listening with scanners. Scrambling is defined in NMT Doc 450-1: System Description (1999-03-23) and NMT Doc 450-3 and 900-3: Technical Specification for the Mobile Station (1995-10-04)'s Annex 26 v.1.1: Mobile Station with Speech Scrambling – Split Inversion Method (Optional) (1998-01-27).

Data transfer[edit]

NMT also supported a simple but robust integrated data transfer mode called DMS (Data and Messaging Service) or NMT-Text, which used the network's signaling channel for data transfer. Using DMS, text messaging was also possible between two NMT handsets before SMS service started in GSM, but this feature was never commercially available except in Russian, Polish and Bulgarian NMT networks. Another data transfer method was called NMT Mobidigi with transfer speeds of 380 bits per second. It required external equipment.

List of NMT operators[edit]

References[edit]

1. ^'Nokia 1100 phone offers reliable and affordable mobile communications for new growth markets' (Press release). Nokia Corporation. 27 August 2003. Archived from the original on 6 December 2008. Retrieved 26 May 2009.
2. ^Nordsveen, Arve M (28 November 2005). 'Mobiltelefonens historie i Norge' (in Norwegian). Norsk Telemuseum. Archived from the original on 13 February 2007.
3. ^Областной-Стационарный (ФЛ)_NMT
4. ^'Archived copy'. Archived from the original on 6 February 2016. Retrieved 5 February 2016.CS1 maint: archived copy as title (link)
5. ^'Роскомнадзор - Реестр лицензий в области связи'. Archived from the original on 6 February 2016. Retrieved 5 February 2016.
6. ^Petersen, Julie K. (2002). The telecommunications illustrated dictionary. CRC Press. ISBN9781420040678.

The mobile call termination (MCT) market review covers the wholesale service provided by a mobile communications provider to connect a call to a recipient on its network.

Below you can find details of the outcomes of our market review, with links to corresponding documents.

Charge ceiling for wholesale MCT 2019-20

Published 29 January 2019

Ofcom has calculated the nominal charge ceiling applicable under SMP Condition M2.3, for the period from 1 April 2019 to 31 March 2020 (the Second Relevant Period), to be 0.479 pence per minute. This is the amount that Ofcom will use for monitoring compliance with the wholesale mobile call termination charge control^[1] ('the control'). We are publishing this today following the publication of the Consumer Price Index (CPI) for December 2018, on 16 January 2019.

Wholesale mobile voice call termination (MCT) is the service necessary for a network operator to connect a caller with the intended recipient of a call on a different mobile network. The control sets a charge ceiling (see SMP Condition M2.2 and M2.3)^[2] expressed in pence per minute, that limits the amounts that the four national mobile operators can charge other communication providers for MCT.

Ofcom undertook to publish the nominal cap prior to the start of each control year (see paragraphs 1.19, 4.174 and 6.30 of the 2018 Statement). Since the control uses an CPI-X formula, it is only possible to calculate the charge ceiling (in nominal terms) once the CPI has been published.

[1] See Mobile call termination statement, 27 March 2018.

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[2] See Mobile call termination statement, Annex 4, Schedule 2, Part 3.

Charge ceiling for wholesale MCT 2020-21

Published 15 January 2020

Ofcom has calculated the nominal charge ceiling applicable under SMP Condition M2.3, for the period from 1 April 2020 to 31 March 2021 (the Third Relevant Period), to be 0.468 pence per minute. This is the amount that Ofcom will use for monitoring compliance with the wholesale mobile call termination charge control^[1] ('the control'). We are publishing this today following the publication of the Consumer Price Index (CPI) for December 2019, on 15 January 2020.

Wholesale mobile voice call termination (MCT) is the service necessary for a network operator to connect a caller with the intended recipient of a call on a different mobile network. The control sets a charge ceiling (see SMP Condition M2.2 and M2.3)^[2] expressed in pence per minute, that limits the amounts that the four national mobile operators can charge other communication providers for MCT.

Ofcom undertook to publish the nominal cap prior to the start of each control year (see paragraphs 1.19, 4.174 and 6.30 of the 2018 Statement). Since the control uses an CPI-X formula, it is only possible to calculate the charge ceiling (in nominal terms) once the CPI has been published.

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[1] See Mobile call termination statement (PDF, 1.4 MB), 27 March 2018.

[2] See Mobile call termination statement, Annex 4, Schedule 2, Part 3 (PDF, 2.2 MB).

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(*) MTR cap applies to all mobile communication providers as listed in the 2018 MCT statement.

For background on the caps, see our final statement setting out the conclusion of our review of the wholesale MCT markets 2018-2021.

Previous reviews and Regulations can be accessed from the National Archives.