If, we can cyclically reorder to obtain sequentially connected polling sequences, and, and multipolling frame transmissions are sufficient to grant the direct transmission opportunities to the transmitting STAs of the connections in the groups in.
(For instance, let,,, and. Then we can reorder to obtain two sequentially connected polling sequences as,.) Generally, if, we can cyclically reorder to obtain sequentially connected polling sequences, and, and multipolling frame transmissions are sufficient to grant the direct transmission opportunities to the STAs in the groups in.
If a and b users (including user 1) can transmit at maximum TR during the ν and ν + 1 time slots, respectively, then user 1 will be granted transmission for both time slots with probability 1/(a b).
When all direct data transmission opportunities are granted, the AP initiates the next PI by transmitting a polling frame to an STA an SIFS period after the response transmissions from the STAs are completed or can initiate the next PI after the wireless medium is determined to be idle during a PIFS period.
If the latter is what "thinness" consists in, then an advocate could try to grant the transmission of a thinner warrant but still emphasize that transmission failure is the rule when the warrants are thicker (Davies 2003b, but compare Wright 2003, p. 72).
The AP transmits the polling frames to grant the transmission opportunities to the STAs.
If, that is, is sequentially connected, only one multipolling frame transmission is sufficient to grant the direct transmission opportunities to the STAs in the groups in.
If, that is, is sequentially connected, only one multipolling frame transmission is sufficient to grant the direct transmission opportunities to the transmitting STAs of the connections in the groups in.
According to the superframe structure in [1], a CFP during which the PCF polls the STAs to grant the transmission opportunities alternates with a contention period (CP) during which the DCF controls the data transfer.
Essentially, the DCF mechanism, which relies on the carrier sense multiple access with collision avoidance (CSMA/CA) algorithm, is designed to grant equal transmission opportunities to all devices in the network including the access point (AP) and its clients.
