C4S under the hood

C4S was built on top of state-of-the-art network coding technology, ensuring that wireless communication gets the speed it deserves

The Fundamentals of C4S


Wireless links present two major challenges: packet loss and latency

  • When using TCP, lost data packets cause individual retransmissions
  • The sender needs to wait for the ACK of each packet, before sending new data
  • Latency affects the time the ACKs take to reach the sender, thus impairing speed
  • C4S is significantly faster than TCP because:

  • C4S ensures that every transmission is useful, irrespective of receiver status
  • Via proprietary Network Coding techniques: mixing original data packets into coded transmissions
  • C4S does not need to wait for the ACK of individual packets to send new data
  • Reduces tremendously the impact of latency



  • Comparison with TCP


    C4S outperforms TCP in two fundamental aspects for mobile communication:
    C4S is robust to packet loss and latency


    C4S vs TCP - Latency

    C4S vs TCP - Packet Loss





    C4S consistently outperforms TCP


  • For low latencies (25-75 ms) and low packet loss (0%-0.1%), between 76% and 423% faster

  • Higher latencies lead to higher improvements, from 304% to 1205% faster for 150ms of latency


  • Contacts

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