However, the time slot used by the receiver depends on the hop distance of the current sender [e.g., if the reservation request message has been forwarded over two nodes (two-hops) before reaching the receiver, it will use the time slot number 2].
However, NMP still has to use the proposed four-way-handshaking mechanism to obtain the time slots on CH1 in CP, and then NMP can use the time slots to transmit data in DTP.
For example, if the channel quality is not good enough to directly forward the received packet, the RS temporarily buffers the packet and uses the available time slot for the waiting users that have better channel quality [5].
In this section, we analyze the performance of protocols when varying their main parameters, namely, the total number of time slots (used by DV-CAST and SRD), τmax (used by UV-CAST) and the time slot density t s d (used by AMD).
Using the same time slots, transmission power, and processing of the codewords in the relay terminal with the decode and forward strategy as in [9], the codes proposed here achieve up to 1.9-dB1.9-dBover the QC-LDPC codes depending on the location of the relay with respect to the source and the destination.
That is, a SU senses the intended channel out of the sensing periods expected by the attacker and uses the remaining time slot to transmit data if the channel is actually vacant.
Otherwise, both TXs use the third time slot.
In this case, we will use the third time slot for simultaneous transmissions.
Different nodes can use the same time slot if they do not interfere with each other [22].
Since time slot selection is made independently at VAA level, there is a nonzero probability that other links use the same time slot, causing interference.
