1. Wireless TCP 3 Types of Wireless TCP Indirect TCP Mobile TCP Snooping TCP

4. Indirect TCP(I-TCP) In indirect TCP mobility support router ( FA) is there We have MN or MH and CN or CH CN and FA(router) wired internet connected MH and FA wirelessly connected internet connected 1)First CN will send data through wired internet to FA 2) As FA gets data,FA sends one ACK to CN CN assume data sent to MH by FA but data is at FA 3) FA sends data to MH 4) As MH gets data,MH sends one ACK to FA ( Temporary ACK) IFFFF MH not giving ACK to FA or data not got by MH from CN,then FA retransmit data to MH This is called Indirect TCP

5. Mobile TCP(M-TCP)

6. Approximetly same as I-TCP Mobile tcp,divides tcp conection in 2 parts.. 1)Unmodified TCP or fixed TCP or wired internet( CN to SH) 2)W ireless internet(SH to MH) or Optimized TCP SH is same as FA in indirect tcp It will NO retransmit,NO storing,NO ACK It sees or supervises all packets and proper communication between MH and CN If No ACK from MH to FA ( Disconnected)sets Senders Window Size 0 As soon as connection established it resumes sending data to sender

8. Snooping TCP(S-TCP) S- TCP better than I-TCP in terms of End to End TCP connection means if MH not got the data then CN will get know that MH not got the data But in indirect TCP,CN will not get know bcoz ack alredy we sent by FA to CN before sending to MH One additional layer is snooping.. Snooping: It watches each packet in both direction (kon kaha he) Buffering: Storing data and slowely sends to MH 1) CN sends data to FA 2) FA stores and buffers all data..it will not send any ACK to CN 3)FA will slowely sends data one by one to MH 4) now MH sends ACK to FA then FA send ACK to CN so Snooping from MH to FA And Buffering from FA to CN If FA not gets ACK from MH then FA retransmit data to MH till ACK not get from MH