September 20, 2021

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Rumor: iPhone 13 supports satellite communication – tablets and phones – news

I was/was very skeptical because by default the satellite has a lot of power and the big antenna, so I dug into this a bit more. With the current data I have I say: Not true.

What happened here is the following. GlobalStar has obtained permission to add LTE band 53 to the LTE spectrum (March 2020). This is part of TDD (time division duplexing) and you only need one frequency for uplink and downlink.

repeat:
2483.5 – 2495MHz S-band, which includes WiFi

Bandwidth:
11.5MHz

Qualcomm is here Now made a chip for it (Feb 2021).

However, Globalstar is mainly doing the Internet of Things. This band is mainly used for that and you can use it as a traffic channel (read a bit like SMS was first used for provider messages).

At least that’s what I’ve been able to discover so far.

Update 1: They do with Nokia Already something they use as an alternative to WiFi. Find out more about using S Band for aerospace business in the broadest sense. I am very curious to know what our colleagues know about this. You have a strong idea of ​​using base stations, but less.

Update 2: GlobalStar is incidentally a joint venture between Loral Corporation and Qualcomm. Currently, their own phones still have a thick battery and a large antenna. Their current offer is the Internet with a speed of up to 9600 bits / sec.

Update 3: Band 53 is intended to provide more bandwidth for Internet of Things Applications. The more I read, the more skeptical I became.

Fourth update: I know something about connectivity. Opus is currently the most widely used codec. Opus can still provide reasonably high sound quality at low bandwidth. That starts at 6 kbit/s, but you still need low latency. To connect, it has to be less than 200 milliseconds before it gets really annoying. Low orbit (LEO) satellite networks have a transmission potential of about 40 milliseconds (at 1,000 km) so they are suitable for communication. The LPCNet codec which uses 1.6 kb/s has also been worked on. This could become part of Opus (direct link to Xiph.Org), but it isn’t yet. Jean-Marc Fallin (tof blog) also now no longer works with Mozilla but with AWS, so I don’t think this will happen any time soon.

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By the way, my interest stems from the fact that I institution A business whose goal is equitable access to communication. One of the reasons Start the link – see point 8. to feel comfortable.

[Reactie gewijzigd door Ma_rK op 30 augustus 2021 12:17]