When the channel becomes unavailable, the packet transmission is interrupted for a random length R until an available operating channel can be used by the CR pair, at which time the packet transmission is resumed.
Otherwise, they repeat the new channel selection procedure, which executes Algorithm 2 and performs spectrum access on a new selected operating channel, after deleting the current operating channel from.
Ind represents the success or the failure of spectrum access, and represents a channel number of the operating channel.
The proposed scheme works as follows: if a PU arrives at the operating channel of the SU, the SU moves to the BKC and the candidate channel is used as the new BKC; if two PUs arrive, one at the operating channel and the other at the BKC, the candidate channel is immediately selected as the operating channel of the SU.
In the monitoring phase, they prepare a case of switching their operating channel from the current one to another unoccupied channel because of the sudden appearance of primary users or their encounter with a low performance on the current operating channel for a certain time.
When the operating channel of a SU is rendered unavailable due to the detection of PUs' activity, the routing protocol would redirect the communication through another vacant channel, without considering reconfigurability.
A separate mini-craniotomy for the ultrasound transducer, with approximately a 90° angle to the operating channel, could also be made to acquire high-quality ultrasound images.
In 1987 he moved to Channel 12, a privately operated channel known for its news coverage, where his analytic coverage of Salvadoran politics appealed to the country's leftist and working-class interests.
These data indicate that in the presence of low [CPA], a Ca2+ influx pathway is activated by brief applications of CCh and remained functional for a considerable time after agonist removal, and thus suggests it is not directly regulated by a receptor operated channel.
