公开(公告)号：BR9702209A

公开(公告)日：1999-07-20

申请号：BR9702209

申请日：1997-02-13

Applicant: MOTOROLA INC

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

IPC: H04W28/26 ,  H04W36/08 ,  H04W36/20 ,  H04J13/02

Abstract: To mitigate the adverse affects of the load imbalance phenomenon prevalent in 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 within the communication system. The multi-carrier wireless communication system monitors a plurality of metrics corresponding to the loading of each of the plurality of carriers in the communication system and, based upon the metrics, will handoff 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：FR2772544A1

公开(公告)日：1999-06-18

申请号：FR9811233

申请日：1998-09-09

Applicant: MOTOROLA INC

Inventor： KOTZIN MICHAEL D

IPC: H04B7/02 ,  H04Q7/38

Abstract: A characteristic of the remote unit (106) reverse link transmission is analyzed by the communication system (100, 108) for determining which of a plurality of forward links is being demodulated. Communication system (100) operations, such as soft handoff, forward link diversity, forward link power control and slow speed data transmission are managed in view of the forward link being demodulated by the remote unit (106).

公开(公告)号：CA2302491A1

公开(公告)日：1999-03-11

申请号：CA2302491

申请日：1998-07-17

Applicant: MOTOROLA INC

Inventor： ROHANI KAMYAR ,  ROZANSKI WALTER J JR ,  KOTZIN MICHAEL D

IPC: H04L27/20 ,  H04B7/005 ,  H04B7/06 ,  H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04L1/02 ,  H04B1/69 ,  H04B7/02

Abstract: Orthogonal transmit diversity is implemented by employing a data splitter(803) to subdivide channel information (801) into at least a first portion of bits (802) and a second portion of bits (804). Each portion is spread with its own Walsh code for eventual transmission to a mobile station via a predetermined carrier frequency. When the number of bits in the first and second portion (802, 804) are small, separate Walsh codes are used to maintain orthogonality. When the number of bits in the first and second portion (802, 804) are relatively large, a time-division multiplex transmission is used to maintain orthogonality. A controller (809) controls the subdivision of the channel information and also an interleaver (308) to further enhance the effects of the diversity transmission. Control information related to the subdivision is transmitted to the mobile station so the channel information can be accurately reconstructed prior to decoding.

公开(公告)号：CA2072373C

公开(公告)日：1998-10-06

申请号：CA2072373

申请日：1991-02-20

Applicant: MOTOROLA INC

Inventor： KOTZIN MICHAEL D ,  SPEAR STEPHEN L

IPC: H04B7/26 ,  H04J13/00 ,  H04J13/06 ,  H04W16/02 ,  H04W16/12 ,  H04W16/24 ,  H04J3/02 ,  H04B1/713

Abstract: In a TDMA cellular network, there is provided a mechanism for shared-carrier fre quency-hopping. It comprises: allocating on a frame basis within a reuse diameter to one coverage area (A-I) during certa in timeslot(s) at least one from a pool of TDM frame-hopped carriers and allocating on a frame basis within that carrier re use diameter to another coverage area (A-I) during certain other, substantially non-overlapping timeslot(s) that frame-hoppe d carrier, all in substantially non-interfering time-synchronism with any proximal reuse of that carrier, whereby the advantages of frequency hopping are obtained. Stated differently, it comprises: at one instant in time, allocating within a reuse dia meter to one coverage area (A-I) at least one of a plurality of hopped carriers and at that same instant in time, allocating within that carr ier reuse diameter to another coverage area (A-I) another of that plurality of hopped carriers, all in time-synchronism with any p roximal reuse of that carrier. The control and access carriers may also be included in the hopping pool, causing certain timesl ots to be hopped on a sequence different from the others. The pool of hopped carriers is further apportioned among co-located site s into hopping groups, thereby reducing intra-system synchronization requirements. To solve the near/far problem, TDM ti meslots bordering hopping boundaries are preferentially allocated to less distant mobile users.

公开(公告)号：BR9703557A

公开(公告)日：1998-08-04

申请号：BR9703557

申请日：1997-06-13

Applicant: MOTOROLA INC

Inventor： BONTA JEFFREY D ,  KOTZIN MICHAEL D

IPC: H04B7/26 ,  H04W36/08 ,  H04W52/42 ,  H04W72/08 ,  H04Q7/22

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：DE69226012D1

公开(公告)日：1998-07-30

申请号：DE69226012

申请日：1992-11-25

Applicant: MOTOROLA INC

Inventor： BRUCKERT EUGENE J ,  KOTZIN MICHAEL D

IPC: H04B7/26 ,  H04J4/00 ,  H04W16/02 ,  H04W16/12 ,  H04Q7/20

Abstract: A method of reducing interference within a cellular system (10) by partitioning a designated frequency spectrum within a service coverage area (01, 02, or 03) into a first and at least second spectrum inclusive of the designated frequency spectrum, each with an associated power level, and offsetting the spectrums for each TDM frame under the control of an offset number unique to each TDM frame. Assignment of communication units to a spectrum and power level are based upon distance from the base site (as determined through signal strength measurements). The spectral content of spectrums in adjacent service coverage areas is adjusted to include non-coincidental frequencies.

公开(公告)号：DE69127839T2

公开(公告)日：1998-03-26

申请号：DE69127839

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：MX9704857A

公开(公告)日：1998-01-31

申请号：MX9704857

申请日：1997-06-27

Applicant: MOTOROLA INC

Inventor： KOTZIN MICHAEL D ,  BONTA JEFFREY D

Abstract: Un método que mejora la velocidad de decodificacion y confiabilidad de las estaciones base de células adyacentes al facilitar el proceso de decodificacion si la calidad de la señal de un canal de tráfico se encuentra dentro de un rasgo predeterminado. En particular, los canales de control adyacentes se monitorean y decodifican a una velocidad rápida al ignorar la informacion del canal de tráfico de voz. La voz interrumpe (526) y la informacion del canal se decodifica (526), por ejemplo, la proporcion de error de bit o la proporcion de error de la configuracion del canal de tráfico (TCH) es deteriorante mientras otro canal tiene una mejor señal. La programacion de las interrupciones del canal de voz (522) pueden también ocurrir cuando la informacion disponible de las células vecinas es insuficiente al inicio de una llamada o inmediatamente después de la transferencia. La señal de voz perdida puede ser recuperada (536) utilizando técnicas de extrapolacion de voz convencionales.

公开(公告)号：DE19722743A1

公开(公告)日：1998-01-02

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：DE69127839D1

公开(公告)日：1997-11-13

申请号：DE69127839

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.