Forum Discussion

Geoffrey Leach's avatar
5 years ago

Telemedicine and satelite

Telemedicine requires real-time video and audio interchange with a medicalprofessional. Its becomming more common, especially these days. My experience with on attempt at a telemedicine session suggests that satelite latency makes this impractical, at best.

 

Questions: is my diagnosis of the problem correct? If so, would a short-term (say 30 min) bandwith increase be practical. Might there be other solutions?

  • Bandwidth increases wouldn't change latency, as latency is a result of the distance between the satellite and your site. 

  • maratsade's avatar
    maratsade
    5 years ago

    Latency + congestion

    Congestion = traffic on the beam, which is the geographic area the satellite signal covers.

    Too  many people using the system at the same time in the same geographical area overloads the system's capacity. 

     

    *I am not a Hughesnet employee or representative. This is a customer-to-customer tech support community, and I am a customer.

  • Telemedicine is not that much different from streaming, and streaming is not the same as downloading a single file. You're not getting a whole file when you stream. You're getting packets of smaller video/audio segments that require regular handshaking to ensure each packet is complete and received in the correct order. Each handshake requires several pings back and forth which may be delayed by different times. Whether the handshake was received by the server in time for the next packet and/or how not receiving it at all is interpreted by the server determines if the stream is halted in a 'buffered' state or not. Making matters worse, telemedicine and other forms of video conversations (e.g., Skype, Facetime) are more complex than this because they're trying to synchronize in both directions, not just one.

  • In my haste I meant to add that if the server deems the packet wasn't recieved, when in fact it just got the handshake late, it may attempt to resend the packet anyway, resulting in using twice the data.

  • maratsade's avatar
    maratsade
    Distinguished Professor IV

    Bandwidth increases wouldn't change latency, as latency is a result of the distance between the satellite and your site. 

    • Geoffrey Leach's avatar
      Geoffrey Leach
      Sophomore

      OK. So what else explains the breaking up of transmission?

      • maratsade's avatar
        maratsade
        Distinguished Professor IV

        Latency + congestion

        Congestion = traffic on the beam, which is the geographic area the satellite signal covers.

        Too  many people using the system at the same time in the same geographical area overloads the system's capacity. 

         

        *I am not a Hughesnet employee or representative. This is a customer-to-customer tech support community, and I am a customer.