Let us consider the discrepancy in the start times of the slots between the STAs, as shown in Figs. 2 and 3.
Figure 2 shows the synchronized slot model, which was included in the conventional analysis model [8]. We propose to use an unsynchronized slot model for analyzing the system throughput performance, as shown in Fig. 3.
When STA B transmits an ACK frame, the discrepancy in the end time of ACK transmission and reception is equal to the propagation delay δ and hence, the start times of both the backoff counters are inconsistent.
The conventional model assumes that STAs A and B reset the start timings of the backoff counters when a DIFS period has elapsed after the reception of the ACK frame.
The start timings of the backoff counters of both STAs A and B are then synchronized by eliminating δ.
On the other hand, in the unsynchronized slot model shown in Fig. 3, no slot alignment for synchronizing the start timings of the backoff counters to eliminate δ is performed; that is, the start timing of
Let us consider the discrepancy in the start times of the slots between the STAs, as shown in Figs. 2 and 3. Figure 2 shows the synchronized slot model, which was included in the conventional analysis model [8]. We propose to use an unsynchronized slot model for analyzing the system throughput performance, as shown in Fig. 3. When STA B transmits an ACK frame, the discrepancy in the end time of ACK transmission and reception is equal to the propagation delay δ and hence, the start times of both the backoff counters are inconsistent. The conventional model assumes that STAs A and B reset the start timings of the backoff counters when a DIFS period has elapsed after the reception of the ACK frame.The start timings of the backoff counters of both STAs A and B are then synchronized by eliminating δ. On the other hand, in the unsynchronized slot model shown in Fig. 3, no slot alignment for synchronizing the start timings of the backoff counters to eliminate δ is performed; that is, the start timing of
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