If no node transmits a reply in a given slot, the slot is called empty slot.
Thus, the receiver node b transmits a REPLY message with probability P A ; otherwise, it returns to idle state.
Secondary radar, in addition to primary radar characteristics, uses a transponder on the target for responding to interrogation by transmitting a coded reply signal.
For instance, for two-hops, the responder receives the synchronization request from a petitioner, and instead of sending back the synchronization reply, it transmits a synchronization request to the next node in the path toward the destination, adding one more hop.
Then U a transmits the reply message { M 6 a, M 7 a } to C i. On receiving { M 6 a, M 7 a }, the user C i first obtains the random number R sa by computing M 8 = M 6 a ⊕ M 1, where M 1 = h (ID i || x s ).
In two-way ranging, an anchor node transmits a packet to a target node, which replies by an acknowledgment packet to the anchor node after a response delay.
— Ten days after finding out in a text message that he was being left off the U.S. Presidents Cup team, Jim Furyk transmitted his reply in 59 strokes.
Using the short-range radio interface, the main nodes transmit a query to ancillary nodes, and those nodes that receive the query reply with an acknowledgement, becoming candidate cooperating nodes.
A node wishing to transmit or retransmit a broadcast transmits a position request at first to all neighbours and waits until all neighbours reply.
If a node decides to transmit a HELLO message in a slot, it does so in the first mini-slot and listens to the channel for any REPLY message(s) from its neighboring node(s).
