Struct definition used in the EAC receiver process model
{ state; // three possible values: unused, open, and closed.
subnet_id; // subnet that contains the sender.
pk_num; // number of packets received during the session.
seq_id; // sequence number of the last received packet.
trans_rate; // transmission rate used in the current phase.
trans_dur; // estimated transmission duration. loss_num ; // number of packets lost.
loss_rate ; // (packets sent – packets received)/packets sent
timer ; // time of the first packet arrival.
event; /* an event handle for setting the timer to invoke the action of sending feedback at the end of the probing phase. Reference this handle in case of event cancellation. */
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