公开(公告)号：DE19722743C2

公开(公告)日：1999-12-09

申请号：DE19722743

申请日：1997-05-30

Applicant: MOTOROLA INC

Inventor： KOTZIN MICHAEL D ,  BONTA JEFFREY D

IPC: H04B7/26 ,  H04W36/08 ,  H04W52/42 ,  H04W72/08 ,  H04B17/00 ,  H04B7/005 ,  H04B7/212 ,  H04Q7/34 ,  H04Q7/38

Abstract: A method improves the decoding rate and reliability of adjacent cell base stations by expediting the decode process if the signal quality of a traffic channel is within a predetermined range. In particular, adjacent control channels are monitored and decoded at a rapid rate by ignoring the speech traffic channel information. The speech is interrupted (526) and the channel information is decoded (526) when, for example, the bit error rate or frame error rate of the traffic channel (TCH) is deteriorating while another channel has a better signal. The scheduling of speech channel interruptions (522) may also occur when insufficient neighbor cell information is available at the beginning of a call or immediately after handover. The lost speech signal could be recovered (536) using conventional speech extrapolation techniques.

公开(公告)号：DE69131147D1

公开(公告)日：1999-05-27

申请号：DE69131147

申请日：1991-07-16

Applicant: MOTOROLA INC

Inventor： KOTZIN MICHAEL D ,  WILSON ALAN L

IPC: G11C19/00 ,  G06F7/58 ,  H03K3/84 ,  H04J13/00 ,  H04J13/10

公开(公告)号：HK1007225A1

公开(公告)日：1999-04-01

申请号：HK98106252

申请日：1998-06-24

Applicant: MOTOROLA INC

Inventor： SCHAEFFER DENNIS RAY ,  KOTZIN MICHAEL D

IPC: H04B7/26 ,  H04B7/005 ,  H04J4/00 ,  H04W36/16 ,  H04W52/50 ,  H04B ,  H04Q

Abstract: A communication system having a site employing a plurality of communication channels. Each channel is assigned a desired received signal strength threshold. A channel is assigned to a subscriber unit based upon the strength of the signal received at the site and the power control range of the subscriber unit. The selection of a channel may be performed either by the site or the subscriber unit. In an FDMA environment, each separate frequency division channel may be assigned different received signal strength thresholds. In a non-overlapping time interval (TDMA) environment, each separate time division channel may be assigned different received signal strength thresholds. In another embodiment, a combination of FDMA and TDMA environments can be used.

公开(公告)号：PL175948B1

公开(公告)日：1999-03-31

申请号：PL31115895

申请日：1995-01-09

Applicant: MOTOROLA INC

Inventor： KOTZIN MICHAEL D ,  STEWART KENNETH A

IPC: G10L19/00 ,  H04B1/10 ,  H04B7/26 ,  H04L12/56 ,  H04W16/14 ,  H04W28/22 ,  H04W36/18 ,  H04Q7/38

Abstract: A code division multiple access (CDMA) communication system reduces interference by reducing the encoding rate for selected mobiles. The system primarily uses link related characteristics such as, inter alia, distance measurements, physical resource power and mobile determined noise, to determine which mobiles require a encoding rate reduction. Once determined, the encoding rate of the determined mobiles is reduced, which in turn reduces self-interference and enhances system capacity.

公开(公告)号：FR2750560A1

公开(公告)日：1998-01-02

申请号：FR9706308

申请日：1997-05-23

Applicant: MOTOROLA INC

Inventor： KOTZIN MICHAEL D ,  BONTA JEFFREY D

IPC: H04W36/08 ,  H04B7/26 ,  H04W52/42 ,  H04W72/08 ,  H04Q7/34

Abstract: A method improves the decoding rate and reliability of adjacent cell base stations by expediting the decode process if the signal quality of a traffic channel is within a predetermined range. In particular, adjacent control channels are monitored and decoded at a rapid rate by ignoring the speech traffic channel information. The speech is interrupted (526) and the channel information is decoded (526) when, for example, the bit error rate or frame error rate of the traffic channel (TCH) is deteriorating while another channel has a better signal. The scheduling of speech channel interruptions (522) may also occur when insufficient neighbor cell information is available at the beginning of a call or immediately after handover. The lost speech signal could be recovered (536) using conventional speech extrapolation techniques.

公开(公告)号：ES2107429T3

公开(公告)日：1997-12-01

申请号：ES91102175

申请日：1991-02-15

Applicant: MOTOROLA INC

Inventor： KOTZIN MICHAEL D

IPC: H04B7/26 ,  H04W36/30 ,  H04Q7/20

Abstract: An RF cellular TDM communication system employing offset frame synchronization between cells, any cell being omni-directional or directional, such that a frame at one cell is offset by an integral number of frames from another cell; the system incorporating multiplexed speech transcoding of traffic channels from multiple cells while supporting stringent delay requirements. Offset frame synchronization (255) for providing rapid mobile assisted handoff.

公开(公告)号：CA2226762A1

公开(公告)日：1997-11-27

申请号：CA2226762

申请日：1997-02-13

Applicant: MOTOROLA INC

Inventor： STOLYAR ALEKSANDR L ,  KOTZIN MICHAEL D ,  FLEMING PHILIP J

IPC: H04W28/26 ,  H04W36/08 ,  H04W36/20 ,  H04Q7/38

Abstract: To mitigate the adverse effects of the load imbalance phenomenon prevalent i n spread spectrum, multi-carrier wireless communication systems, the system beneficially employs the use of handoff as a means for balancing the call traffic (commonly referred to as "load") among a plurality of carriers withi n the communication system. The multi-carrier wireless communication system monitors (214) a plurality of metrics corresponding to the loading of each o f the plurality of carriers in the communication system and, based upon the metrics, will handoff (220) call traffic to and between the plurality of carriers, thereby mitigating the adverse effects associated with the load imbalance, in accordance with the invention.

公开(公告)号：CA2217574A1

公开(公告)日：1997-09-04

申请号：CA2217574

申请日：1996-12-13

Applicant: MOTOROLA INC

Inventor： SPEAR STEPHEN L ,  CSAPO JOHN S ,  SCHAEFFER DENNIS R ,  KOTZIN MICHAEL D ,  THOMPSON DENNIS J

IPC: H04B7/26 ,  H04W36/04 ,  H04Q7/38 ,  H04Q7/36

Abstract: A wireless communication system (200, 300, 400, 500) mitigates the effects o f excess timing delay caused by varying lengths of communication paths. In one general implementation, a transition communication path (206, 323, 329) is used to transfer a time-advanced version of a timing reference signal so tha t the cumulative time delay at a transition cell (209, 325, 331) is reduced. I n another general implementation, the timing reference signal is time-advanced in all communication paths (403-411), and selected communication paths (403- 407) include a time delay means (423-427, 503-507) such that the cumulative time delay at an area (421) near a target coverage area (130) is reduced. By reducing the cumulative time delay at the area (421) near the target coverag e area (130), a hand-off of a communication of a mobile station (128) into the target coverage area (130) can be performed.

公开(公告)号：NZ241128A

公开(公告)日：1997-01-29

申请号：NZ24112891

申请日：1991-12-20

Applicant: MOTOROLA INC

Inventor： LABEDZ GERALD P ,  KOTZIN MICHAEL D ,  SCHULER JOSEPH P

IPC: H04B7/005 ,  H04L25/02 ,  H04L25/03 ,  H04B1/10 ,  H04L25/30 ,  H04L27/01 ,  H04L27/38

Abstract: An equalization system for equalizing a corrupted signal is disclosed. The equalization system includes a complex matched filter (400) and a maximum likelihood sequence estimator (MLSE) (405) for removing the effects of phase shift, amplitude variations, intersymbol interference, etc. resulting from multi-pathing and noise contributed by the receiver front end. The system estimates a correlation signal C(t) (505) and synchronizes C(t) 505 to maximize its energy as seen on the taps of the complex matched filter (400). Taps having amplitude coefficients below a predetermined threshold are set to zero to produce a modified CIR estimate. The modified CIR estimate which has had the effects of noise virtually eliminated, is then used to construct the complex matched filter (400) and is also used as input to the MLSE (405) to produce a better equalized data signal.

公开(公告)号：CA2193506A1

公开(公告)日：1996-11-14

申请号：CA2193506

申请日：1996-04-10

Applicant: MOTOROLA INC

Inventor： SCHMIDT CHRIS ,  KOTZIN MICHAEL D ,  MENICH BERRY J ,  BRUCKERT EUGENE J

IPC: H04B7/26 ,  H04W36/12 ,  H04W36/18 ,  H04Q7/38

Abstract: A method of communication handover from a first communication entity (33) to a second communication entity (43) in a communication system (10) where a communication unit (80), communicating with a transceiver (23) associated with the second communication entity, is linked to the first communication entity. The invention provides for establishing a communication link between the communication unit and the second communication entity while maintaining a communication link between the communication unit and the first communication entity. Then, communications are substantially simultaneously transferred to the second communication entity while terminated from the first communication entity.