公开(公告)号：AU5160998A

公开(公告)日：1998-06-29

申请号：AU5160998

申请日：1997-10-27

Applicant: MOTOROLA INC

Inventor： SCHORMAN ERIC REED ,  ROZANSKI WALTER JOSEPH JR ,  CLARK MICHAEL PAUL

IPC: H04B15/00 ,  H01Q3/26 ,  H04B7/06 ,  H04B7/10 ,  H04B7/26 ,  H04W16/28

Abstract: In a wireless communications system (20), a beacon having a first radiation pattern (28) covering a portion of a subscriber service area (34) covered by a base station is transmitted. A subscriber (36) reception quality is then measured to produce a first beacon quality measurement (210). Thereafter, the first radiation pattern is changed to a second radiation pattern (32, 212), and a subscriber reception quality of the beacon transmitted with a second radiation pattern is measured to produce a second beacon quality measurement (214). In response to the first and second beacon quality measurements, a traffic channel radiation pattern (32) is selected (218), wherein such radiation pattern covers a portion of the subscriber service area. In a preferred embodiment, the beacon carrier frequency is the same as the traffic channel carrier frequency.

公开(公告)号：CA2228899A1

公开(公告)日：1997-12-18

申请号：CA2228899

申请日：1997-03-10

Applicant: MOTOROLA INC

Inventor： ROZANSKI WALTER JOSEPH JR ,  REED JOHN DOUGLAS

IPC: H04B15/00 ,  H04W64/00 ,  H04Q7/22

Abstract: A wireless communication system (200) estimates (303) the location of a mobi le station (215) when a degradation in the mobile station's communication occur s due to interference, and stores (305) the location estimate in a database. T he database is used to determine the potential for the mobile station (215) within the wireless communication system to receive interference based on it s estimated location or its proximity to the known interference location. When the mobile station (215) is within a predetermined distance of the known interference location, the likelihood for the mobile station (215) to experience a degradation in call quality, duration, etc. increases. To migitate the degradation due to interference, an alternate carrier (104) is found and if available, the mobile station's communication is handed off to the alternate carrier (104). Attenuation can also be added in the front-end of the mobile station (215) to mitigate the degradation due to interference.

公开(公告)号：CA2192579A1

公开(公告)日：1996-11-14

申请号：CA2192579

申请日：1996-03-21

Applicant: MOTOROLA INC

Inventor： GHOSH AMITAVA ,  REED JOHN DOUGLAS ,  ROZANSKI WALTER JOSEPH JR ,  BUFORD KEVIN ANDREW

IPC: H04W36/32 ,  G01S5/14 ,  G01S19/09 ,  G01S19/46 ,  H04B7/26 ,  H04W64/00 ,  G01S5/02 ,  H04Q7/22

Abstract: A method and apparatus for determining the location of a communication unit in a CDMA system includes in a first embodiment, sending a location request via a spread spectrum signal to the subscriber (140), and receiving in return a subscriber signal including a response message showing a receive time of a particular symbol of the base's spreading sequence and a transmit time of a particular symbol of the subscriber's spreading sequence. The base (130), along with other receiving base(s) (140), also receives a predetermined symbol of the subscriber spreading sequence, and each determines a respective receive time of the predetermined symbol. The received information is then processed, along with known base location and delay information, to determine the subscriber location. If insufficient number of bases are capable of communicating with the subscriber, for example due to high loading/interference, auxiliary bases (121) are also provided for receiving from or transmitting to the subscriber.

公开(公告)号：EP0843919A4

公开(公告)日：2003-03-19

申请号：EP97908986

申请日：1997-03-10

Applicant: MOTOROLA INC

Inventor： REED JOHN DOUGLAS ,  ROZANSKI WALTER JOSEPH JR

IPC: H04B15/00 ,  H04W64/00 ,  H04B1/10 ,  H04Q7/38

CPC classification number: H04W64/00

Abstract: A wireless communication system (200) estimates (303) the location of a mobile station (215) when a degradation in the mobile station's communication occurs due to interference, and stores (305) the location estimate in a database. The database is used to determine the potential for the mobile station (215) within the wireless communication system to receive interference based on its estimated location or its proximity to the known interference location. When the mobile station (215) is within a predetermined distance of the known interference location, the likelihood for the mobile station (215) to experience a degradation in call quality, duration, etc. increases. To migitate the degradation due to interference, an alternate carrier (104) is found and if available, the mobile station's communication is handed off to the alternate carrier (104). Attenuation can also be added in the front-end of the mobile station (215) to mitigate the degradation due to interference.