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This improvement is due to the complete elimination of the exponential waiting time that occurs during failed transmissions.
The channel quality is determined by calculating for each node the probability to access the channel in a distributed manner by approximating the number of successful and failed transmissions.
The failed transmissions at the HARQ level are detected by means of a cyclic redundancy check (CRC).
In this way, the throughput is increased with reducing the failed transmissions due to suffering too much intereference.
Here, CW is known as contention window and its value depends on the number of failed transmissions for the packet.
where HARQ_Succ_QPSK and HARQ_Fail_QPSK are the number of successful and failed transmissions, respectively, at the HARQ level in the uplink direction using the QPSK modulation.
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Please note that, after a failed transmission, the acknowledgement is not transmitted by the base station.
However, if the buffer is full, then the SU's failed transmission packet will be dropped.
In (19), and denote, respectively, the average time for successful transmission and failed transmission due to collision.
The parameter represents the probability that a node has a consequent packet to transmit after a success or failed transmission.
Also, the probability of at least one failed transmission, leading to unsuccessful data delivery, is 1 − 1 − p lk h.
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