As an attempt to circumvent the probabilistic nature of IEEE 802.11b, this paper presents an enhanced four-layer architecture using the Network Driver Interface Specification (NDIS) and a virtual polling algorithm.
For performance evaluation in terms of average delay, average queue size, loss rate and utilization, five DBA schemes are simulated, namely AP-Sort DBA, interleaved polling with adaptive cycle time (IPACT), dynamic bandwidth allocation with a modified grant table generation algorithm and fair-excess allocation (DBA2-FE), Sort-DBA and double phase polling algorithm (DPA).
According to the "packet-to-transmit" and "station-to-poll" algorithms presented in the previous section, considering that the fairness mechanism is not triggered because of the traffic symmetry which prevents the medium domination, and taking into account that the AP flows are not favored in the studied scenario, the Bandwidth Allowed to be Used (BAU) by each traffic type equals (15).
The graph below shows the estimates produced by my poll-averaging algorithm, a statistical model for combining nationally representative polls to produce a dynamic, composite estimate of the state of public opinion at any given time.
The connection-level polling scheduling algorithm took about 117 seconds to derive each hybrid polling sequence for 3 combinations of a wireless LAN with 40 STAs and the interference condition of.
The voting system, as described in Fig. 1, polls each algorithm to determine whether it should alarm.
The polling least-connection algorithm is as follows.
System distributes loads according to the method of polling least-connection algorithm. .
If the change of illuminance exceeds 20% of the previous illuminance, the control time interval and number of controls are adjusted through the polling period control algorithm so that the occupant cannot recognize the visual unpleasantness due to change of illuminance.
The number of messages transferring in one cluster (text {Packet}_{text {in}_{text {one}}}phantom {dot {i}!}) and the number of messages transferring across clusters (text {Packet}_{text {in}_{text {across}}}phantom {dot {i}!}) calculate by super controller based on polling least-connection algorithm.
