Transport protocols for mobile networks
Wired vs wireless
o TCP works well in the wired network with low BER (
) mainly due to congestion
o TCP is weak when BER is high (
)
TCP/IP services
o Internet standard for reliable transport
o Flexible protocol framework supporting new algorithms and incremental deployment of
modifications
TCP
o Point to point one sender, one receiver
o Reliable, in-order byte stream without message boundaries
o Pipelined TCP congestion and flow control set windows size
o Send and receive buffers
o Full duplex data bidirectional flow in the same connection
o Connection oriented 3-way handshake initiates connection state before data exchange
o Flow controlled so sender does not overwhelm the receiver
o Intermediate network elements only sees datagrams, not the connection
TCP congestion control
o End-to-end control without network assistance
o Transmission rate is limited to congestion window size (Congwin) over segments
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