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She is strict but fair (reservations are required after five o'clock), and famously defensive on her own Yelp page ("Where are the educated customers?").
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The performance of BB protocol with fair reservation policy is depicted in Figure 7.
Due to the above two factors, the performance of the BB protocol with fair reservation suffers slightly when the offered load gradually approaches the highest value (Figure 7a).
Likewise, the median system throughput obtained with the BB protocol degrades when the fair reservation policy is applied, assuming that the same threshold is used both with and without fair policy (see Figures 6d vs. 7d).
This demonstrates that the BB protocol with fair reservation policy allows the spectrum to be shared more flexibly among competing users and across APs in the network, thereby improving the spectral efficiency.
By contrast, with the BB signalling approach, some of the chunks remain idle for up to 3 frames when they are released in order to conform to the fair reservation policy.
To address such problem, a fair reservation mechanism is proposed where the reservation made by the user by transmitting a BB is annulled by the serving AP immediately after finding that the number of slots a chunk has been reserved by a user exceeds the reservation threshold.
It should be noted that the difference between the guaranteed user throughput obtained using the BB protocol with fair reservation and that obtained using resource partitioning decreases as the offered load increases and eventually the static resource partitioning approach slightly exceeds the performance of the former.
In summary, the results have established that the BB protocol with fair reservation policy provides a scalable mechanism to flexibly share the available chunks in the system by adjusting the threshold parameter to strike a desired balance between the conflicting goals of enhancing spectral efficiency against improving user satisfaction in the system.
A heuristic for fair reservation of chunks is proposed that mitigates the problem of outage that arises when the users with heavy traffic demand reserve the available chunks, leaving no chunks available to the new users trying to access the network.
When the offered load in the system is increased to 40 Mbps/cell, the BB protocol with fair reservation achieves up to 14% higher guaranteed user throughput (Figure 7a) together with a 13% increase in median system throughput (Figure 7d) compared to the system using static chunk allocation.
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