Methods of rf sensing control and dynamic frequency selection control for cognitive radio based dynamic spectrum access network systems-cognitive dynamic frequency hopping

Abstract

This invention relates to cognitive radio based wireless communications of dynamic spectrum access networks, and more particularly to a method of addressing radio frequency sensing control and dynamic frequency selection control. A method called Cognitive Dynamic Frequency Hopping that is based on the selective Simultaneous Sensing and Data Transmissions is described. The Cognitive Dynamic Frequency Hopping method is further facilitated by a collision avoidance technique. The described method satisfies both reliable and timely RF sensing for guaranteeing licensed user protection, and QoS satisfaction for services of the dynamic spectrum access systems.

1 . A method of performing DFH operations of a DYSPAN (WRAN) system during a cognitive DFH operation period comprising:
 using a base station to schedule a system including the base station and associated customer devices to hop to a selected working channel based on a frequency selection decision made at the end of a previous operation period;   the base station and all customer devices in the system perform data transmissions on the selected working channel;   the base station performs and schedules all customer devices to perform RF sensing on channels other than the working channel in operation spectrum, with guard bands separating the working channel and the channels being sensed on the selected channel and additional unselected channels simultaneously with the data transmissions;   the customer devices report sensing measurement results to the base station;   the base station processes sensing measurement reports;   the base station announces the frequency selection decision to be used for the next operation period to the customer devices in the system and to all neighboring systems; and   repeating the method for the next DFH operation period.   
     
     
         2 . The method of  claim 1 , further comprising the base station performs channel selections and channel acquisitions, when necessary, after the base station processes sensing measurement reports. 
     
     
         3 . The method of  claim 1 , wherein RF sensing comprises overlapping data transmissions with RF sensing to monitor a full spectrum of channels including those that are in use for data transmissions, wherein bands of spectrum for RF sensing are adaptively selected to find a significant number of channels that are likely to be vacated while guaranteeing reliable and timely RF sensing performance. 
     
     
         4 . The method of  claim 3 , wherein RF sensing further comprises selectively monitoring the full spectrum of channels. 
     
     
         5 . The method of  claim 3 , wherein RF sensing further comprises using at least one in-band channel for data transmission. 
     
     
         6 . The method of  claim 3 , wherein a number of channels to be selected for RF sensing are adaptively adjustable. 
     
     
         7 . The method of  claim 3 , wherein RF sensing further comprises dynamically selecting and switching operating frequencies for data transmissions in continuous time periods. 
     
     
         8 . A method of performing DFH operations of a base station in a DYSPAN (WRAN) system during a cognitive DFH operation period comprising:
 scheduling the system to hop to a selected working channel based on a schedule based on a frequency selection decision made at the end of a previous operation period;   performing data transmissions on the selected working channel;   scheduling all customer devices in the system to perform RF sensing on channels other than the working channel in operation spectrum, with guard bands separating the working channel and the channels being sensed on the selected channel and additional unselected channels simultaneously with the data transmissions;   receiving report sensing measurement results from the customer devices to the base station;   processing sensing measurement reports;   announcing the frequency selection decision to be used for the next operation period to the customer devices in the system and to all neighboring systems; and   repeating the method for the next DFH operation period.   
     
     
         9 . The method of  claim 8 , further comprising performs channeling selections and channel acquisitions, when necessary, after the processing sensing measurement reports. 
     
     
         10 . The method of  claim 8 , wherein RF sensing comprises overlapping data transmissions with RF sensing to monitor a full spectrum of channels including those that are in use for data transmissions, wherein bands of spectrum for RF sensing are adaptively selected to find a significant number of channels that are likely to be vacated while guaranteeing reliable and timely RF sensing performance. 
     
     
         11 . The method of  claim 10 , wherein RF sensing further comprises selectively monitoring the full spectrum of channels. 
     
     
         12 . The method of  claim 10 , wherein RF sensing further comprises using at least one in-band channel for data transmission. 
     
     
         13 . The method of  claim 10 , wherein a number of channels to be selected for RF sensing are adaptively adjustable. 
     
     
         14 . The method of  claim 10 , wherein RF sensing further comprises dynamically selecting and switching operating frequencies for data transmissions in continuous time periods. 
     
     
         15 . A method of performing DFH operations of a consumer device in a DYSPAN (WRAN) system during a cognitive DFH operation period comprising:
 hopping to a selected working channel based on a schedule received in a base station in the system based on a frequency selection decision made at the end of a previous operation period;   performing data transmissions on the selected working channel;   performing, based on a schedule from the base station, RF sensing on channels other than the working channel in operation spectrum, with guard bands separating the working channel and the channels being sensed on the selected channel and additional unselected channels simultaneously with the data transmissions;   sending sensing measurement reports configured to be processed by the base station;   receiving announcement from the base station the frequency selection decision to be used for the next operation period to the customer devices in the system and to all neighboring systems; and   repeating the method for the next DFH operation period.   
     
     
         16 . The method of  claim 15 , wherein RF sensing comprises overlapping data transmissions with RF sensing to monitor a full spectrum of channels including those that are in use for data transmissions, wherein bands of spectrum for RF sensing are adaptively selected to find a significant number of channels that are likely to be vacated while guaranteeing reliable and timely RF sensing performance. 
     
     
         17 . The method of  claim 16 , wherein RF sensing further comprises selectively monitoring the full spectrum of channels. 
     
     
         18 . The method of  claim 16 , wherein RF sensing further comprises using at least one in-band channel for data transmission. 
     
     
         19 . The method of  claim 16 , wherein a number of channels to be selected for RF sensing are adaptively adjustable. 
     
     
         20 . The method of  claim 16 , wherein RF sensing further comprises dynamically selecting and switching operating frequencies for data transmissions in continuous time periods.