Patents by Inventor Amitava Ghosh

Amitava Ghosh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7242956
    Abstract: A method (400) and apparatus (501) provide for rapid power control based on a quality related value, e.g. channel quality indicator (CQI) value. A transmit power level can be derived from a CQI value received according to a time period, e.g. corresponding to 500 Hz. A first predicted value can be predicted based on the CQI value, at a first time within the time period and a power adjustment value can be determined based on the CQI value as well as the first predicted value at a rate that exceeds the rate of receiving the CQI values. Note that other predicted values for or corresponding to the CQI value can be predicted at other times within the time period and that power adjustment values can be determined through interpolation between predicted values for any time within the period.
    Type: Grant
    Filed: December 20, 2004
    Date of Patent: July 10, 2007
    Assignee: Motorola, Inc.
    Inventors: Rapeepat Ratasuk, Amitava Ghosh, Fan Wang, Weimin Xiao, Nick W. Whinnett
  • Patent number: 7237170
    Abstract: A high speed downlink packet access communication system method that supports a plurality of redundancy variations that are characterized by at least a first parameter that comprises an indicator regarding self-decodability of a corresponding packet and a second parameter that comprises a selection of a particular redundancy version from amongst a plurality of candidate redundancy versions. Pursuant to a preferred approach, and upon determining a need to transmit redundant information as corresponds to a given packet, one automatically selects, for at least one of the first and second parameters, a specific value from amongst a plurality of candidate values and then uses the specific value to transmit the redundant information.
    Type: Grant
    Filed: October 6, 2004
    Date of Patent: June 26, 2007
    Assignee: Motorola, Inc.
    Inventors: Rapeepat Ratasuk, Amitava Ghosh, Weimin Xiao
  • Publication number: 20070123267
    Abstract: A cellular communication system includes first and second base stations and a user equipment. A Radio Network Controller controls a handover of the user equipment between the base stations by either forwarding data of the communication to both the first and second base stations or to only one of the first and second base stations dependent on a Quality of Service (QoS) characteristic of the communication of the user equipment. The QoS characteristic can specifically be an indication of a delay constraint for the communication service such as an indication of whether the service is a real-time service or a non-real time service.
    Type: Application
    Filed: November 29, 2005
    Publication date: May 31, 2007
    Inventors: Nick Whinnett, Amitava Ghosh, Weimin Xiao
  • Publication number: 20070121543
    Abstract: A method in a wireless communication network (100) wherein information is communicated in a frame structure wherein each frame includes multiple sub-frames, including grouping at least two wireless communication terminals in a group, assigning the group to less than all sub-frames constituting a communication frame, and assigning a radio resource assignment control channel of one or more assigned sub-frames to the group. The control channel is used to assign radio resources to one or more terminals of the group.
    Type: Application
    Filed: October 4, 2005
    Publication date: May 31, 2007
    Inventors: Ravi Kuchibhotla, Brian Classon, Mark Cudak, Amitava Ghosh, Robert Love, Kenneth Stewart, Yakun Sun, Weimin Xiao
  • Publication number: 20070116007
    Abstract: A method for scheduling and resource allocation in a data communication network (104) that transports data packets for a plurality of sessions is disclosed. The method includes monitoring a packet delay of a session data packet awaiting transport (302). The method also includes re-evaluating a scheduling priority of the session data packet (304). The re-evaluation of the scheduling priority is based on one or more functions of the packet delay.
    Type: Application
    Filed: November 18, 2005
    Publication date: May 24, 2007
    Inventors: Weimin Xiao, Amitava Ghosh, Rapeepat Ratasuk
  • Publication number: 20070098098
    Abstract: In an Orthogonal Frequency Division Multiplexing communication system, a user equipment reports channel quality information that is sufficient to construct a fading profile of a frequency bandwidth and that does not consuming the overhead resulting from the reporting of CQI for every sub-band of the frequency bandwidth. In the communication system, the frequency bandwidth may be represented by multiple sub-band levels, wherein each sub-band level comprises a division of the frequency bandwidth into a number of sub-bands different from the number of sub-bands of the other sub-band levels. The user equipment measures a channel quality associated with each sub-band of a sub-band level of the multiple sub-band levels, selects a sub-band of the sub-band level based on the measured channel qualities, and reports channel quality information associated with the selected sub-band to a radio access network.
    Type: Application
    Filed: October 25, 2006
    Publication date: May 3, 2007
    Applicant: MOTOROLA, INC.
    Inventors: Weimin Xiao, Amitava Ghosh, Rapeepat Ratasuk
  • Publication number: 20070071125
    Abstract: Various embodiments are described to provide for the transmission of data in an improved manner. Data transmission is improved by including in a transmitter a null generator to embed frequency domain nulls into a data symbol sequence to produce a null-embedded data symbol sequence. A symbol inserter inserts a control symbol sequence into the frequency domain nulls of the null-embedded data symbol sequence to produce a combined symbol sequence. A modulator then encodes the combined symbol sequence using IFDMA/DFT-S-OFDM. This approach allows the assignment of a single IFDMA/DFT-S-OFDM code to each user for data and control (pilot, e.g.) signaling, simplifying code management. Frequency hopping techniques may also be employed to lower the pilot overhead.
    Type: Application
    Filed: September 18, 2006
    Publication date: March 29, 2007
    Applicant: Motorola, Inc.
    Inventors: Jun Tan, Amitava Ghosh, Fan Wang
  • Publication number: 20070070894
    Abstract: A method to provide a nominal best effort data rate based on a Quality of Service (QoS) requirement of a user data connection, the method comprising assigning (105) a service priority based on the QoS requirement, and assigning (110) the nominal best effort data rate for the service priority using a predetermined function. Further, it comprises of a method to determine a scheduling priority value for a user data connection by providing a relative fairness. Furthermore, the method comprises a method to satisfy a delay requirement for a delay sensitive data connection through a scheduling.
    Type: Application
    Filed: September 26, 2005
    Publication date: March 29, 2007
    Inventors: Fan Wang, Amitava Ghosh, Rapeepat Ratasuk, Nick Whinnett, Weimin Xiao
  • Publication number: 20070064669
    Abstract: During operation radio frames are divided into a plurality of subframes. Data is transmitted over the radio frames within a plurality of subframes, and having a frame duration selected from two or more possible frame durations.
    Type: Application
    Filed: March 20, 2006
    Publication date: March 22, 2007
    Applicant: MOTOROLA, INC.
    Inventors: Brian Classon, Kevin Baum, Amitava Ghosh, Robert Love, Vijay Nangia, Kenneth Stewart
  • Publication number: 20070058595
    Abstract: During operation radio frames are divided into a plurality of subframes. Data is transmitted over the radio frames within a plurality of subframes, and having a frame duration selected from two or more possible frame durations.
    Type: Application
    Filed: March 20, 2006
    Publication date: March 15, 2007
    Applicant: MOTOROLA, INC.
    Inventors: Brian Classon, Kevin Baum, Amitava Ghosh, Robert Love, Vijay Nangia, Kenneth Stewart
  • Publication number: 20070061690
    Abstract: A method of block puncturing for turbo code based incremental redundancy includes a first step (1200) of coding an input data stream into systematic bits and parity bits. A next step (1202) includes loading the systematic bits and parity bits into respective systematic and parity block interleavers in a column-wise manner. A next step (1204) includes selecting a predefined redundancy. A next step (1206) includes outputting bits from the block interleavers in a row-wise manner in accordance with the selected predefined redundancy.
    Type: Application
    Filed: July 5, 2006
    Publication date: March 15, 2007
    Applicant: MOTOROLA, INC.
    Inventors: KENNETH STEWART, AMITAVA GHOSH, MICHAEL BUCKLEY, RAJA BACHU, RAPEEPAT RATASUK
  • Patent number: 7145891
    Abstract: Quality-of-service for different communication services that share a common physical link (such as at least one code division multiplexing code) is provided. Outer power loop control serves to maintain quality-of-service for a selected one of the communication services that has, in a preferred embodiment, a highest relative requirement for quality-of-service. Rate matching parameters are then selected independent of transmission energy factors to ensure that the remaining communication services abide by their corresponding quality-of-service requirements.
    Type: Grant
    Filed: July 29, 2003
    Date of Patent: December 5, 2006
    Assignee: Motorola, Inc.
    Inventors: Rapeepat Ratasuk, Amitava Ghosh, Michael M. Wang, Weimin Xiao
  • Publication number: 20060176936
    Abstract: Various embodiments are described to provide for the transmission and reception of data in an improved manner. Data transmission is improved by including in a transmitter a null generator (110) to generate an output data symbol sequence that exhibits nulls in the frequency domain at particular frequencies that an input data symbol sequence does not. A pilot inserter (120) then adds a pilot symbol sequence to this output data symbol sequence to create a combined symbol sequence. Since the pilot symbol sequence exhibits pilot signals corresponding to the nulls of the output data symbol sequence in the frequency domain, the combined symbol sequence exhibits pilots that are orthogonal to the data in the frequency domain.
    Type: Application
    Filed: February 9, 2005
    Publication date: August 10, 2006
    Inventors: Fan Wang, Amitava Ghosh, Chandrasekar Sankaran, Jun Tan
  • Patent number: 7085575
    Abstract: In a mobile telecommunication system (10), a number of user equipments (40–45) may receive multimedia broadcast multicast services. The method for power allocation and user assignment for MBMS services determines any number (K) of user equipments which may be served without complete cell area coverage (78). For more than K user equipments (40–45) requesting MBMS services, dedicated channels are assigned (84). For user equipments requesting MBMS service during a broadcast, such user equipment is assigned to the channel (broadcast or dedicated) with the lower power requirement, if power is available. If the user is assigned to the broadcast channel, and power is available, power of the broadcast channel is adjusted (108). Otherwise, the power of the broadcast channel is increased and no further power is indicated as being available (112).
    Type: Grant
    Filed: August 18, 2003
    Date of Patent: August 1, 2006
    Assignee: Motorola, Inc.
    Inventors: Jean-Aicard Fabien, Amitava Ghosh, Rapeepat Ratasuk
  • Patent number: 7085582
    Abstract: Various gain factors for pilot information are used to determine a corresponding plurality of likely channel performance values for a plurality of data channels (and/or services). The resultant information is used to select a specific gain factor to apply when transmitting the pilot information. In one embodiment, the gain factor that correlates to the highest signal to interference plus noise ratio is used.
    Type: Grant
    Filed: July 31, 2002
    Date of Patent: August 1, 2006
    Assignee: Motorola, Inc.
    Inventors: Weimin Xiao, Rapeepat Ratasuk, Amitava Ghosh
  • Publication number: 20060146756
    Abstract: In a network, where a packet is to be transmitted on a channel to a communication device with a time offset between a shared control channel and a shared data channel, the packets can be ordered. A margin (301) can be determined (403) between a power need of a data channel of a packet and a total available transmit power (315) of the network infrastructure device. Scheduling packets (405) is responsive to the margin, and determines the next packet to be sent, where the control channel of the next packet has a power need less than the power margin. Resources are allocated (407) responsive to the margin to further determine the subsequent packet. The subsequent packet is transmitted (411) on the channel, wherein the data channel of the current packet and the control channel of the subsequent packet are at least partially contemporaneous.
    Type: Application
    Filed: December 30, 2004
    Publication date: July 6, 2006
    Inventors: Fan Wang, Amitava Ghosh, Robert Love
  • Publication number: 20060135193
    Abstract: A method (400) and apparatus (501) provide for rapid power control based on a quality related value, e.g. channel quality indicator (CQI) value. A transmit power level can be derived from a CQI value received according to a time period, e.g. corresponding to 500 Hz. A first predicted value can be predicted based on the CQI value, at a first time within the time period and a power adjustment value can be determined based on the CQI value as well as the first predicted value at a rate that exceeds the rate of receiving the CQI values. Note that other predicted values for or corresponding to the CQI value can be predicted at other times within the time period and that power adjustment values can be determined through interpolation between predicted values for any time within the period.
    Type: Application
    Filed: December 20, 2004
    Publication date: June 22, 2006
    Inventors: Rapeepat Ratasuk, Amitava Ghosh, Fan Wang, Weimin Xiao, Nick Whinnett
  • Patent number: 7065068
    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.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: June 20, 2006
    Assignee: Motorola, Inc.
    Inventors: Amitava Ghosh, Brian Classon, Mark Cudak, Louay A. Jalloul
  • Publication number: 20060105798
    Abstract: Various embodiments are described to address the need for an apparatus and method of outer-loop power control for enhanced uplink communications that address some of the outstanding problems in the prior art. Generally expressed, a base site (131), while a first uplink channel is inactive, monitors packet retransmissions to generate an uplink quality indicator. Here, packet retransmissions refers to the number of packet retransmissions used by a remote unit (101) to send packets to a base transceiver station (111) via at least one other uplink channel. Also, while the first uplink channel is inactive, the base site adjusts a signal-to-interference ratio (SIR) target for the first uplink channel based on the uplink quality indicator. Then, when the first uplink channel becomes active, the base site begins power controlling the first uplink channel using the SIR target.
    Type: Application
    Filed: November 8, 2005
    Publication date: May 18, 2006
    Inventors: Amitava Ghosh, Rapeepat Ratasuk, Nick Whinnett
  • Publication number: 20060099985
    Abstract: A base station (101) of a cellular communication system (100) comprises a receiver (105) and a channel quality processor (111) which receive channel quality indications from a communication unit (103). The base station (101) further comprises a transmitter (107) for transmitting signals to the communication unit (103). A first power control processor (115) controls the transmit power in response to a first power control mode of operation and a second power control processor (117) controls the transmit power in response to the second power control mode of operation. A rate processor (113) determines a rate of change indication for the channel quality indications and a selector (119) selects between the first power control mode and the second power control mode in response to the rate of change indication. The power control mode of operation may be modified to suit the current channel variations of the communication channel.
    Type: Application
    Filed: November 9, 2004
    Publication date: May 11, 2006
    Inventors: Nick Whinnett, Amitava Ghosh, Rapeepat Ratasuk, Weimin Xiao