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PCF is a centralized scheduling protocol which uses a point coordinator at the access point (AP).
Similar to the PCF in IEEE802.11, we designate each AP in the network as a point coordinator.
It implements a centralized polling scheme to support synchronous data transmissions, where the Point Coordinator (PC) performs the role of polling master.
As α tends toward 0, the BSS reverts to a contention-only-based environment where the point coordinator is not used to poll STAs.
The point coordinator subsystem residing in an AP continues to poll STAs in its polling list until the CFP duration expires.
The protocol running within each cluster is a variation of the near-optimum DQCA protocol for infrastructure-based WLANs [4] which, despite requiring the presence of a central point coordinator, operates in a completely distributed manner.
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A single-point coordinator will be a bottleneck to scalability for result receiving and task scheduling.
Again, since we limit the number of group masters and therefore reduce communication frequency, the synchronization penalty of having a single-point central coordinator is limited.
The tricky part comes when an organization grows to the point where the coordinators need coordinating.
At one point, Daniel Majesty Sanchez, a coordinator for the Justice Committee in the Bronx, directly addressed the black police officers standing watch over the demonstration.
We are still discovering its extent and will have to do a full and thorough final assessment at some point," said survey coordinator Drubha Thapa, president of the Nepali Engineers Association NEAA).
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Justyna Jupowicz-Kozak
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