公开(公告)号：CA2693483C

公开(公告)日：2013-10-22

申请号：CA2693483

申请日：2008-07-30

Applicant: MOTOROLA INC

Inventor： GURNEY DAVID P ,  CHAUDHRI APOORV ,  RAO YADUNANDANA N ,  SIMMS MATTHEW E

IPC: H04W16/14

Abstract: Efficient frequency spectrum sharing between at least one incumbent communication system(s) (102, 152) and at least one cognitive radio (CR) system (105) is provided. The incumbent system's system parameters and CR system's operational requirements are copied to a mirrored database (106B). The mirrored database (106B) is controlled by a either a central authority (108) or a database manager having delegated authority (508). The mirrored database (106B) is accessed by the CR system (105). The mirrored database (106B) can be modified and updated by the central authority (108) or delegated database manager (508) to correct for interference detected in the incumbent system caused (152) by the cognitive radio system (105). The cognitive radio system (105) utilizes the updated mirrored database (106B) to avoid interfering with the incumbent system (102, 152) to determine CR system operating parameters thus enhancing the ability to share spectrum.

公开(公告)号：CA2728838C

公开(公告)日：2014-07-15

申请号：CA2728838

申请日：2009-08-24

Applicant: MOTOROLA INC

Inventor： CHAUDHRI APOORV ,  GURNEY DAVID P ,  KUFFNER STEPHEN L ,  RAO YADUNANDANA N ,  SIMMS MATTHEW E

IPC: H04W16/14 ,  H04W72/02

Abstract: A technique for a secondary communication system to utilize spectrum designated to another (or primary) communication system is provided. By ranking a plurality of secondary base stations based on base station transmit power, calculated required transmit power and path loss, a set of cri-teria is developed for selecting a highest ranked secondary base station for operation within a primary's spectrum. The ranking may be adapted based on mobility of the secondary's subscriber; and as such the secondary system communicates within the primary's spectrum using the adaptively ranked base stations. Channel selection may also be ranked. The technique and apparatus allows a cognitive radio (CR) net-work to operate within an incumbent network's spectrum.

公开(公告)号：AU2009300250A1

公开(公告)日：2010-04-08

申请号：AU2009300250

申请日：2009-08-24

Applicant: MOTOROLA INC

Inventor： CHAUDHRI APOORV ,  GURNEY DAVID P ,  KUFFNER STEPHEN L ,  RAO YADUNANDANA N ,  SIMMS MATTHEW E

IPC: H04W16/14 ,  H04W72/02

Abstract: A technique for a secondary communication system to utilize spectrum designated to another (or primary) communication system is provided. By ranking a plurality of secondary base stations based on base station transmit power, calculated required transmit power and path loss, a set of criteria is developed for selecting a highest ranked secondary base station for operation within a primary's spectrum. The ranking may be adapted based on mobility of the secondary's subscriber; and as such the secondary system communicates within the primary's spectrum using the adaptively ranked base stations. Channel selection may also be ranked. The technique and apparatus allows a cognitive radio (CR) network to operate within an incumbent network's spectrum.

公开(公告)号：CA2582366C

公开(公告)日：2010-03-23

申请号：CA2582366

申请日：2005-09-14

Applicant: MOTOROLA INC

Inventor： RUELKE CHARLES R ,  CHAUDHRI APOORV ,  STOGNER DARRELL J

IPC: H04B15/00 ,  H04W36/20 ,  H04W36/36

Abstract: A method for maximizing intermodulation interference protection during a handoff between radio cell sites (300) includes scanning a plurality of radio channels (302) and measuring the signal power (307, 315) for at least one of the radio channels. One or more receiver attenuators (313) are then set based on the detection of intermodulation (IM) interference of the measured channel. The attenuators are then scaled (311) based on the degree of IM interference. If the attenuators cannot mitigate this interference below some predetermined level, the radio channel is changed (321) and the process begins again to ensure a high quality of communication with a cell site.

公开(公告)号：CA2679677A1

公开(公告)日：2008-10-09

申请号：CA2679677

申请日：2008-03-12

Applicant: MOTOROLA INC

Inventor： RAO YADUNANDANA N ,  PRYSBY DANIEL G ,  WARE CHRISTOPHER G ,  ZELEZNIK MICHAEL F ,  CHAUDHRI APOORV ,  CORKE ROBERT J ,  DELVE TREFOR J

IPC: H04W16/14 ,  H04W48/16

Abstract: A method (20,200) and apparatus (10) for detecting and identifying spectr um opportunities, including the steps of communicating a location of at leas t one node (12) to at least one base station (14) (24), transmitting a list of at least one channel from the at least one base station (14) to the at le ast one node (12) (26), and sensing the at least one channel from the list b y the at least one node (12) (34). The method (20,200) also includes the ste ps of determining if the at least one channel is in use, and if the at least one channel is in use, determining the user of the at least one channel tha t is in use (38).

公开(公告)号：CA2582336A1

公开(公告)日：2006-04-13

申请号：CA2582336

申请日：2005-09-14

Applicant: MOTOROLA INC

Inventor： LAMPERT CHET A ,  ALAZRAKI SCOTT M ,  JELAVIC STANKO ,  CONRAD ALAN P ,  CHAUDHRI APOORV ,  LOGALBO BOB D ,  PINDER ELLIS A ,  STOGNER DARRELL J

IPC: H04M3/18

公开(公告)号：AU2003296304A8

公开(公告)日：2004-06-30

申请号：AU2003296304

申请日：2003-12-08

Applicant: MOTOROLA INC

Inventor： LOGALBO ROBERT D ,  CONRAD ALAN P ,  STOGNER DARRELL JAMES ,  ALAZRAKI SCOTT M ,  JELAVIC STAN ,  CHAUDHRI APOORV

IPC: H04J3/16 ,  H04W72/04 ,  H04W72/12 ,  H04Q11/00

Abstract: An outbound message (200) identifies a slot type associated with each timeslot in a scheduling period. In one embodiment, the outbound message further identifies at least an address of a first subscriber group assigned to transmit in a first timeslot (206) if the slot type of the first timeslot is of a first type and an address of a second subscriber group assigned to transmit in a second timeslot (208) if the slot type of the second timeslot is of a second type, wherein the first type and the second type could be the same or different. In a second embodiment, the outbound message further identifies at least a group address associated with a plurality of subscriber units assigned to transmit in a first timeslot if the slot type of the first timeslot is of a first type. In yet a third embodiment, the outbound message further identifies an address of a first subscriber group assigned to transmit in a first timeslot if the slot type of the first timeslot is of the first type, and a second timeslot (210) of a second type.

公开(公告)号：CA2728825C

公开(公告)日：2014-01-14

申请号：CA2728825

申请日：2009-08-18

Applicant: MOTOROLA INC

Inventor： CHAUDHRI APOORV ,  ANDRIC OLEG ,  RAO YADUNANDANA N

IPC: H04W16/14 ,  H04W24/10

Abstract: A technique for spectrum sensing management and control for a secondary communication system seeking to utilize another communication system's spectrum is provided (600) Sensor control data is sent from a base station to subscriber units (604) Sensing measurements are taken and sent back to the base station for ranking (608) as sensed feedback information. Comparisons of the sensed feedback information are made to each other and to thresholds aligned with the types of measurements taken (610). An initial ranked channel list is generated (612) Weighting of the initial ranking list and secondary ranking list is followed by re-ranking the channels according to the weighting into a final ranking list (612). The final ranking list is transmitted to the mobile units to enable operation within the other communication system's spectrum within interfering with that system (614). The weighting is based on the type of sensing measurement taken as opposed to the channel.

公开(公告)号：CA2728533C

公开(公告)日：2013-10-08

申请号：CA2728533

申请日：2009-06-19

Applicant: MOTOROLA INC

Inventor： RAO YADUNANDANA N ,  CHAUDHRI APOORV ,  CORKE ROBERT J

IPC: H04L27/26 ,  H04W16/14

Abstract: Efficient frequency spectrum sharing between at least one incumbent communication system(s) (102, 104) and at least one cognitive radio (CR) system (106, 108) is provided. The CR unit includes OFDM detection (216) for detecting the presence of OFDM signals which indicate the presence of an incumbent communication system within the shared spectrum. The CR system (106) updates channel occupancy information in response to the detected OFDM signals so as not to interfere with the incumbent communication systems (102, 104).

公开(公告)号：CA2728838A1

公开(公告)日：2010-04-08

申请号：CA2728838

申请日：2009-08-24

Applicant: MOTOROLA INC

Inventor： CHAUDHRI APOORV ,  GURNEY DAVID P ,  KUFFNER STEPHEN L ,  RAO YADUNANDANA N ,  SIMMS MATTHEW E

IPC: H04W16/14 ,  H04W72/02

Abstract: A technique for a secondary communication system to utilize spectrum designated to another (or primary) communication system is provided. By ranking a plurality of secondary base stations based on base station transmit power, calculated required transmit power and path loss, a set of cri-teria is developed for selecting a highest ranked secondary base station for operation within a primary's spectrum. The ranking may be adapted based on mobility of the secondary's subscriber; and as such the secondary system communicates within the primary's spectrum using the adaptively ranked base stations. Channel selection may also be ranked. The technique and apparatus allows a cognitive radio (CR) net-work to operate within an incumbent network's spectrum.