Ofcom clears the way for 700MHz broadband

Ofcom, the Super Regulator, has published a statement that will clear the 700MHz band (694 MHz - 790 MHz) for use by mobile broadband services (likely to be additional bands for LTE services).

It is expected that the auctioning of this band will raise significant revenue for the treasury as well as having a positive economic benefit by allowing mobile network operators (MNOs) access to increased spectrum allowing them to provide better data services. The 700MHz band has very good propagation properties (i.e. signals pass through walls etc well) which should improve mobile coverage in rural areas.

Digital Terrestrial Television (DTT) services will continue to operate in the 600MHz band, though multiplexes will use MPEG-4 and DVB-T2 technologies (any tuner that can decode Freeview HD will work with these technologies).

The main users affected by this will be Programming and Special Events (PMSE) radio microphones, who will have to move to other bands.

Whitespace technologies may also be affected, however these haven't really taken off in a big way and even Neul that has built equipment to utilise whitespace have recently concentrated on licensed spectrum (and have been purchased by Huawei).

This may seem daunting, but Ofcom is not proposing that these changes come into effect until 2020 (and maybe 2 years earlier in 2018), this is in-line with European harmonised spectrum strategy.

Ofcom awards new TV spectrum

Ofcom, the super regulator has issued a statement on the award of the 600MHz band (550 to 606 MHz). This has been awarded to Arqiva for the provision of Digital Terrestrial Television (DTT) multiplexes. Arqiva will utilise MPEG4 video encoding and DVB-T2 transmission services (as used by Freeview HD).

This is a temporary license, though it will run through until 2026, unless Ofcom give Arqiva 24 months notices in which case it can be revoked in 2018.

The ability to terminate the license is to allow migration of DTT services from the 700MHz band to the 600MHz band in line with EU harmonised spectrum regulation and will allow the 700MHz band to be used for wireless broadband services.

Ofcom consults on future use of 700MHz band

Ofcom , the Super regulator is holding a consultation on the future of the 700MHz band (694 - 790 MHz). This band is being used for Wireless Broadband in several countries and the EU is proposing to harmonise this band across the EU for the same purpose.

The band falls within spectrum used for Digital Terrestrial Television (DTT) also know as the UHF band IV and V which spans 470MHz through 862MHz. After the digital switchover the 800MHz band was cleared (channels 61 through 69) and this was recently auctioned off for use by mobile network for 4G/LTE services.

The lower end of the band (channels 21 through 30) starting at 470MHz is used for interleaved spectrum, local TV broadcasts (from 2013), Program making and special events (PMSE) and whitespace services (from 2014).

The band between channels 31 to 37 - the 600MHz band was cleared as part of the digital switchover.

Channel 38 is used for PMSE exclusively and now allows high power devices in the lower end of the spectrum.

The current 700MHz DTT band extends from channel 39 through channel 60 and will also be used for whitespace services from 2014.

If this spectrum is made available for mobile broadband use, it will have very good propagation characteristics and be good for rural broadband and other uses.

Though Ofcom is consulting now, the 700MHz band won't be available until 2018 at the earliest as use of the band must be in-line with International policy.

Ofcom have produced a nice picture describing the changes.

Ofcom has a duty under the Wireless Telegraphy Act 2006 to have regard to: -

• the extent to which the electromagnetic spectrum is available for use, or further use, for wireless telegraphy
• the demand for use of the spectrum for wireless telegraphy
• the demand that is likely to arise in future for the use of spectrum for wireless telegraphy.

and using the 700MHz band falls into these duties.

Unfortunately it does mean all DTT transmissions will have to move into the cleared 600MHz (channels 31 through 37) band and the lower end of the current 700MHz band (channels 39 through 48) so in 2018 there is likely to be a second TV switchover. It's also likely that set top boxes will have to use DVB-T2 and MPEG4 (rather than the less efficient DVB-T and MPEG2 that is currently used by standard definition broadcasts today, though DTT in High Definition or HD already uses DBV-T2 and MPEG4).

The full statement is on-line here and stakeholders may respond through an on-line form.

Ofcom proposes new DTT multiplex in 600MHz

Ofcom the super regulator that covers many operations including broadcasting and spectrum allocations is proposing to open up the 600MHz band for Digital Terrestrial Television (DTT) broadcasts. The 600MHz band is actually made up of frequencies from 550-606 MHz in 8MHz channels (known as channels 31 to 37). This band was cleared when the analogue transmission services were switched off.

The new DTT service will utilise DVB-T2 and MPEG4 which allows more spectral efficiencies than older DVB-T technology and MPEG4 compresses video more efficiently than MPEG2 which current non-DS DTT services use. Program making and special events (PMSE) services will still be allowed to reside in the band as will whitespace technology (this uses localised unused spectrum to offer wireless broadband/communication services).

Ofcom is acting in accordance with EU spectrum policy, whereby the current DTT services which operate in 700MHz should move to the 600MHz band and 700MHz will be used for wireless broadband services, though migration will not happen before 2018.

Thopugh this is a proactive mode for Ofcom, many set-top boxes built for DTT will not operate in 600MHz and new systems will have to be purchased.

Ofcom is proposing to make the license available immediately at a cost of £180,000 with a minimum period until 2018 but with a 12 month notice period so Ofcom can migrate current services into this band.

The consultation is available here and interested stakeholders may respond on-line.

Ofcom to move DTT from 700MHz to 600MHz

Ofcom, the Super Regulator, is proposing to clear the current Digital Terrestrial Television (DTT) band at 700MHz and move it to the 600MHz band that was cleared during the digital switchover. This is not going to be a quick process and Ofcom are proposing a 2018 switch-over date.

This is in-line with both EU and International harmonised spectrum policy.

The 700MHz band is already used for wireless broadband in countries such as North America and the EU also wishes to move in this direction to cope with future broadband spectrum requirements (the band could be used for LTE or other wireless broadband technologies). The 800MHz band is already being freed (as part of the digital switchover) and is being auctioned in early December 2012 and should be available in March 2013 and it is assumed the licensees will operate LTE services in the 2 bands being auctioned.

In order to move DTT services, it will be necessary to ensure maximum spectral efficiency and thus it's likely DTT MUX's will all have to migrate to DVB-T2 and MPEG-4 (as is used by Freeview HD) which may affect end-users as they will have to ensure they have the correct systems to receive these transmissions.

Ofcom are also keen to promote innovative new services such as White Space Devices (WSD) as these can use parts of the spectrum that aren't being used for DTT services (this is mainly due to overlapping DTT regions that have to use different frequency sets and thus there are areas of spectrum that are left empty in one area so as not to interfere with neighbouring areas). The 'white spaces' are perfectly usable for controlled transmissions that wont interfere with neighbouring areas, but can provide spectrum for broadband. WSDs will need to contact a central database, both to ensure that they are only using allowable frequencies and also Ofcom may enforce a kill switch to ensure that if interference does occur, that the devices can be remotely disabled.

Currently trials of WSDs are taking place in the 700MHz band.

Though 2018 seems a long way away, it took a huge amount of effort to ensure the current digital switchover could take place and it seems that this is really a second digital switchover (though DTT services already operate in the lower 600MHz band so new equipment and transmitters/etc shouldn't be required).

Digital dividend: 600 MHz band and geographic interleaved spectrum | Ofcom

Digital dividend: 600 MHz band and geographic interleaved spectrum | Ofcom

Ofcom is consulting on the 600MHz band which will become free as part of the UK's Digital Dividend as analogue TV is switched off in 2012.

This consultation aims to:

* update stakeholders on spectrum availability, how developments have changed this and how technical considerations may affect spectrum use.

* seek stakeholders' input on potential uses of the spectrum and on their level of interest in acquiring it. This information will help us develop proposals on how best to make the spectrum available.

Ofcom originally published what it was going to do in 2008, but the market has changed since then and other European countries have decided to refactor the upper end of the 800MHz band and this has knock-on effects for the lower half of the 600MHz band (some paring was to take place).

There's potentially many uses for the spectrum which include Digital Terrestrial Television (DTT) and mobile broadband as well as mobile multimedia services (MMS e.g. mobile television), program making and special events (PMSE), broadband wireless access (BWA) and communications for the emergency services.

Ofcom expect to publish proposals for further consultation when they are more certain about what spectrum will be available for award.

Though Ofcom has some autonomy on these matter, unfortunately radio signals do not honour national boundaries and thus they have to act in a manner that is friendly to the UK's neighbours.

The consultation closes on 28/04/2010