Red experimental cognitiva: Algoritmos y resultados

Cognitive wireless mesh network without common control channel evaluated in NS-3

“…This algorithm is called Minstreal [23]. Minstrel algorithm classifies transmission rates using integer numbers [0,1,2,3,4,5,6,7, 8,9]. For example, if data transmission flow is too low, Minstrel will use a rate equal to zero, in the same way, if the data transmission flow is too high, the Minstrel will use a rate equal to nine.…”

“…The difference of MC-OIM algorithm in relation to practical implementations of cognitive networks [9] is that it does not run any in-band sensing process (in-band sensing is not done). When PU and WMN use the channel at the same instant of time, the channel switching is performed to the channel i * , considering that synchronization is a crucial factor on this algorithm, if routers can not synchronize, each WMN will switch to channel i * * , called emergency channel.…”

“…The resource manager details of cognitive network deployed at CPqD campus are beyond the scope of this article but they are detailed in [9].…”

“…The signal received by R2 is used as the signal input for energy detection algorithm in order to check spectrum signal only outside the band, in contrast of what is traditionally done in the literature(in-band and out-band sensing simultaneously) [9].…”

“…One of those interfaces is used to exchange control messages between routers [8] and other interfaces are used to receive and transmit packages in different channels. A particular case of this architecture was developed in [9], in which the cognitive network has a Wi-Fi interface on each router, this interface is used to transmit and receive data packets on 4 different channels, those channels are being exploited opportunistically using cognitive network rules. The interface used to exchange control messages is fixed to a common control channel (CCC) to disseminate routing information and update the channels status information.…”