A receiver sends a Zero Window Advertisement (ZWA) to the sender when handoff is impending The Sender freezes all timeout timers and halts the data transmission when it receives ZWA After the handoff is finished, the receiver sends 3 Dup_ACKs with available receive window size Then the sender resumes data transmission with its old congestion window size.
zero window advertisement can not stop the sender's RTX timer, in my understand, the zero window advertisement can only tell the sender not to send new traffic, but the sender will still keep the timer running, and when the timer expires, the cwind is reduced, and some packets are retransmitted unnecessary.
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