公开(公告)号：CA2365634C

公开(公告)日：2006-03-28

申请号：CA2365634

申请日：2001-01-05

Applicant: MOTOROLA INC

Inventor： JALLOUL LOUAY A ,  CUDAK MARK C ,  CLASSON BRIAN K ,  GHOSH AMITAVA ,  LOVE ROBERT T

IPC: H04B1/00 ,  H04B15/00 ,  H04L1/00 ,  H04L1/20 ,  H04W16/14 ,  H04W28/22

Abstract: A mobile station (110) selects an initial data rate for communication betwee n base station (107) and mobile station (110). Mobile station (110) communicat es the selected initial data rate to base station (107) through uplink (112). Base station (107) determines a difference level of interference condition experienced by mobile station (107) between a time when the initial data rat e was selected by mobile station (110) and a time when base station (107) prepares to communicate to mobile station (110). Base station (107) selects a final data rate for transmission from base station (107) to mobile station (110) based on the determined difference level of interference condition. As such, the initial data rate may be modified to the final data rate while maximizing the down link capacity.

公开(公告)号：CA2535424A1

公开(公告)日：2005-03-10

申请号：CA2535424

申请日：2004-08-23

Applicant: MOTOROLA INC

Inventor： LOVE ROBERT T ,  GHOSH AMITAVA ,  WHINNETT NICK W

IPC: H04L1/00 ,  H04L1/16 ,  H04L1/18 ,  H04W36/16 ,  H04W88/06 ,  H04W88/10

Abstract: During a random access communication opportunity (12), user equipment (20) utilizes either or both of an adaptive modulation and coding-based communication protocol (26) and an HARQ-based communication protocol (27) to achieve improved performance. This can avoid the need to establish dedicated channels (13) to support the required communications. In one embodiment, a plurality of adaptive modulation and coding-based communication protocols ar e provided with a given protocol being selected as a function of one or more governing criteria. For example, the protocol can be selected as a function of a quality condition of the communication path, as a function of a memory buffer, and so forth.

公开(公告)号：DE60017785D1

公开(公告)日：2005-03-03

申请号：DE60017785

申请日：2000-10-26

Applicant: MOTOROLA INC

Inventor： GHOSH AMITAVA ,  CLASSON K ,  CUDAK C ,  JALLOUL LOUAY

IPC: H04J13/04 ,  H04B7/26 ,  H04L1/00 ,  H04L27/30 ,  H04Q7/38

Abstract: A communication system (100) provides selecting a first modulation-coding scheme (111) based on a quality indicator of a communication between a source user and a first destination user, determining a first possible number of data bits (201) that can be modulated and encoded according to selected modulation-coding scheme (111) and spread according to one spreading code of a plurality of spreading codes (108-1 through 108-k) which results in fitting in a predetermined time frame, determining a first number of data bits (102) to be transmitted from the source user to the first destination user, determining a first load level based on comparing first number of data bits (102) and first possible number of data bits (201), and, if the first load level is unequal to a whole number, rounding to a next first whole number, selecting a first number of plurality of spreading codes (108-1 through 108-k) based on the first whole number of load level for spread coding of first number of data bits (102) after being modulated and coded according to selected modulation-coding scheme (111).

公开(公告)号：CA2533829A1

公开(公告)日：2005-03-03

申请号：CA2533829

申请日：2004-06-28

Applicant: MOTOROLA INC

Inventor： RATASUK RAPEEPAT ,  WHINNETT NICHOLAS W ,  GHOSH AMITAVA ,  LOVE ROBERT T

IPC: H04B7/005

Abstract: The present invention relates to methods of operation of a communication device and to corresponding communication devices. In particular the inventi on relates to a first method of operation of a communication device, wherein so me pilot bits associated with data bits are transmitted with a power at least partly dependent on the data rate at which the data bits are transmitted. At the base station, power control is carried out only on pilot bits with constant power, whereas channel estimation is carried out on all pilot bits.

公开(公告)号：BR0015579A

公开(公告)日：2002-07-09

申请号：BR0015579

申请日：2000-11-02

Applicant: MOTOROLA INC

Inventor： CUDAK MARK C ,  GHOSH AMITAVA ,  CLASSON BRIAN K ,  JALLOUL LOUAY

IPC: H04L1/00 ,  H04L1/08 ,  H04L1/18 ,  H04Q7/38 ,  H04B7/212

Abstract: A method in a communication system (100) includes transmitting from a source user (101) a first data packet (111) over a first time frame (121) having a finite time period (131), transmitting from source user (101) a second data packet (112) over a second time frame (122) immediately subsequent to first time frame (121), detecting an acknowledgment of acceptable reception of data packet associated with either first or said second data packets (111 and 112), repeating transmission of first and second data packets (111 and 112) in a sequence of first and second time frames (121 and 122) in a time frame sequence (190) until the detection.

公开(公告)号：BR0015558A

公开(公告)日：2002-07-09

申请号：BR0015558

申请日：2000-11-02

Applicant: MOTOROLA INC

Inventor： GHOSH AMITAVA ,  CUDAK MARK C ,  CLASSON BRIAN K ,  JALLOUL LOUAY

IPC: H03M13/29 ,  H03M13/35 ,  H04L1/00 ,  H04L1/02 ,  H04L1/18 ,  H04L29/08

Abstract: A generic structure of Hybrid ARQ using Turbo Codes is provided which requires the function of a) channel coding, b) redundancy selection, c) buffering and max-ratio diversity combining, d) channel decoding, e) error detection and f) sending back an acknowledgement to the transmitter. The functions (a) and (b) are performed at the transmitter while functions (c) to (f) are performed at the receiver. The initial code rate can be explicitly communicated to the receiver or blindly detected.

公开(公告)号：AU1306802A

公开(公告)日：2002-05-15

申请号：AU1306802

申请日：2001-10-09

Applicant: MOTOROLA INC

Inventor： GHOSH AMITAVA ,  JALLOUL LOUAY

IPC: H04L1/18 ,  H04W28/04 ,  H04W36/18 ,  H04Q7/00

Abstract: A method of combining soft-handoff with a hybrid ARQ scheme to maximize throughput and gain in a communications system. After receiving a frame from the MS (110), the BTSs (104 and 106) will process the frame and communicate to the MS over a forward control channel whether the frame contained any errors. If all BTSs communicate that the frame contains errors, the MS will retransmit the same frame to all BTSs with a flush bit set to instruct the BTSs 104 and 106 to combine the retransmitted frame with the original frame. If only some BTSs communicate that the frame contains errors, the MS will transmit the next frame to all BTSs that successfully decoded the frame with the flush bit set to instruct the BTSs to erase the previous frame from memory and not to combine the previous frame with the current frame. The MS will retransmit the frame to the BTSs that did not successfully decode the frame with the flush bit set to instruct the BTSs to combine the previous frame with the retransmitted frame.

公开(公告)号：AU4963201A

公开(公告)日：2001-10-30

申请号：AU4963201

申请日：2001-03-30

Applicant: MOTOROLA INC

Inventor： LOVE ROBERT T ,  CLASSON BRIAN K ,  GHOSH AMITAVA ,  JALLOUL LOUAY A ,  CUDAK MARK C

IPC: H04B7/26 ,  H04J11/00 ,  H04J13/00 ,  H04J13/18 ,  H04W48/12 ,  H04W72/14 ,  H04Q7/20

Abstract: Separate forward dedicated and shared control channels are provided in a spread-spectrum communication. The forward dedicated control channel is used to communicate persistent control information and point to the shared control channel when further intermittent control information concerning transmission of data to a mobile station needs to be communicated. The use of a dedicated control channel for only necessary persistent control information, while only pointing to a shared control channel when it is needed, affords more efficient utilization of system resources.

公开(公告)号：CA2391634A1

公开(公告)日：2001-05-25

申请号：CA2391634

申请日：2000-11-02

Applicant: MOTOROLA INC

Inventor： CUDAK MARK C ,  CLASSON BRIAN K ,  JALLOUL LOUAY ,  GHOSH AMITAVA

IPC: H04L1/00 ,  H04L1/08 ,  H04L1/18 ,  H04Q7/38 ,  H04B7/212

Abstract: A method in a communication system (100) includes transmitting from a source user (101) a first data packet (111) over a first time frame (121) having a finite time period (131), transmitting from source user (101) a second data packet (112) over a second time frame (122) immediately subsequent to first time frame (121), detecting an acknowledgement of acceptable reception of da ta packet associated with either first or said second data packets (111 and 112 ), repeating transmission of first and second data packets (111 and 112) in a sequence of first and second time frames (121 and 122) in a time frame sequence (190) until the detection.

公开(公告)号：GB2304500B

公开(公告)日：1999-12-01

申请号：GB9625755

申请日：1996-03-21

Applicant: MOTOROLA INC

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

IPC: H04W36/32 ,  G01S5/14 ,  G01S19/09 ,  G01S19/46 ,  H04B7/26 ,  H04W64/00 ,  H04Q7/38

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.