One of the main impasses and reasons that delayed the frequency auction for 5G is the interference caused by the open satellite TV service (TVRO). The president of the National Telecommunications Agency (Anatel), Leonardo Euler de Morais, says that the regulator should choose the transition to Ku band if there are no filters to mitigate the interference caused by devices using the new technology.
For the adoption of 5G at 3.5 GHz, Anatel foresees two alternatives for the TVRO service: mitigation or migration. The mitigation provides for the use of an LNBF filter (low noise conversion block) in the parabolic ones that would mitigate interference from towers and mobile devices; the migration involves the adoption of the Ku band for the open TV service via satellite.
Euler says that Anatel’s technical area has not yet felt “comfortable” with the LNBF filters presented. Some tests have already been carried out, but the results did not please.
Morais points out that the manufacturers have presented prototypes based on the results presented by the agency, but that they should continue with the migration to the Ku band if there is no mitigation solution until the frequency auction, which should occur in the first quarter of 2021.
Ku band migration is the most expensive solution
Band C comprises the frequency of 3.7 GHz to 6.4 GHz. About 11 Brazilian satellites adopt the band, but another 26 foreigners are also authorized to serve Brazil. The Ku band uses the 10.7 GHz to 18 GHz band. The migration would be complex and costly, involving changes in satellite positions and the use of new satellite dishes. It would also be necessary to replace receivers and LNBs for the approximately 12.5 million users.
In the past, SindiTelebrasil calculated that the migration from TVRO to the Ku band would cost around R $ 7.7 billion, while a mitigation solution would cost R $ 455.7 million. The bill for the distribution of the kits should go to the operators that finish off the spectrum of the fifth generation.
The situation is reminiscent of the disconnection of analog TV: Anatel had to release the frequency of the service for the adoption of 4G of 700 MHz, and cellular operators had to bear the costs of distributing ISDB-T converters and UHF antennas.
With information: Telesynthesis