Combined Sector and Channel Hopping Schemes for Efficient Rendezvous in Directional Antenna Cognitive Radio Networks

Figure 9

Rendezvous between SUs and according to the combined PES-SCH scheme. and . Number of best-quality channels per each sector .

(a) The combined PES-SCH sequence construction for the sender

(b) The combined PES-SCH sequence construction for the receiver

(c) Synchronous sector and channel rendezvous between and

(d) Asynchronous sector and channel rendezvous between the SUs when starts its hopping earlier than by 4 slots