公开(公告)号：MY147515A

公开(公告)日：2012-12-31

申请号：MYPI20091451

申请日：2007-10-29

Applicant: QUALCOMM INC

Inventor： PRASAD MALLADI DURGA

IPC: H04L5/02

Abstract: 32 METHOD AND APPARATUS FOR HYBRID FDM-CDM STRUCTURE FOR SINGLE CARRIER BASED CONTROL CHANNELS ABSTRACT A SYSTEM AND METHOD FOR HYBRID FDM (FREQUENCY DIVISION MULTIPLEXING)-CDM 5 (CODE DIVISION MULTIPLEXING) STRUCTURE FOR SINGLE CARRIER CONTROL CHANNELS IS PROVIDED. THE HYBRID FDM-CDM STRUCTURE MAXIMIZES FREQUENCY DIVERSITY OVER THE ENTIRE AVAILABLE BANDWIDTH SUCH THAT ORTHOGONALITY BETWEEN SIGNALS FROM USERS IN A GIVEN CELL IS MAINTAINED. THUS, USERS IN THE GIVEN CELL CAN TRANSMIT OVER A NON-CONTIGUOUS SET OF TONES. FURTHERMORE, THE HYBRID FDM-CDM STRUCTURE MAINTAINS ORTHOGONALITY OF A PILOT 10 OF USERS IN DIFFERENT CELLS BASED ON A DESPREADING OPERATION IN THE TIME DOMAIN.

公开(公告)号：AU2008286775B2

公开(公告)日：2011-11-17

申请号：AU2008286775

申请日：2008-08-15

Applicant: QUALCOMM INC

Inventor： SANDIP SARKAR ,  PRASAD MALLADI DURGA ,  BYOUNG-HOON KIM ,  JUAN MONTOJO

IPC: H04B7/04

Abstract: Techniques for sending multiple-input multiple-output (MIMO) transmissions in wireless communication systems are described. In one design, a transmitter sends a first reference signal via a first link, e.g., a cell-specific reference signal via the downlink. The transmitter receives channel quality indicator (CQI) information determined by a receiver based on the first reference signal. The transmitter also receives a second reference signal from the receiver via a second link, e.g., a sounding reference signal via the uplink. The transmitter obtains at least one MIMO channel matrix for the first link based on the second reference signal. The transmitter determines at least one precoding matrix based on the at least one MIMO channel matrix, e.g., in accordance with ideal eigen-beamforming or pseudo eigen-beamforming. The transmitter then sends a data transmission to the receiver based on the at least one precoding matrix and the CQI information.

公开(公告)号：AU2008286714B2

公开(公告)日：2011-11-10

申请号：AU2008286714

申请日：2008-08-15

Applicant: QUALCOMM INC

Inventor： JUAN MONTOJO ,  SANDIP SARKAR ,  PRASAD MALLADI DURGA ,  BYOUNG-HOON KIM

IPC: H04B7/04

Abstract: Techniques for sending traffic data and control information in a wireless communication system are described. In one design, a transmitter (e.g., a Node B or a UE) may perform beamforming to send traffic data on M layers based on a precoding matrix, where M may be one or greater. The transmitter may also perform beamforming to send control information on up to M layers based on the same precoding matrix used for the traffic data. The transmitter may send the beamformed traffic data on a first physical channel and may send the beamformed control information on a second physical channel. The transmitter may multiplex the beamformed traffic data and the beamformed control information using time division multiplexing (TDM) or frequency division multiplexing (FDM).

公开(公告)号：AU2008204871B2

公开(公告)日：2011-11-10

申请号：AU2008204871

申请日：2008-01-10

Applicant: QUALCOMM INC

Inventor： PRASAD MALLADI DURGA

IPC: H04L27/26

Abstract: Systems and methodologies are described that facilitate multiplexing unicast reference symbols and multicast transmissions in the same transmission time interval. In particular, mechanisms are provided that enable multiplexing unicast reference symbols to single frequency network transmissions that utilize a longer cyclic prefix duration. Unicast reference symbols are sent in a first symbol of a slot containing both unicast and single frequency network transmissions. The frequency utilized for the unicast reference symbols is staggered between the first symbol and a subsequent symbol in a sub-frame.

公开(公告)号：AU2011203130A1

公开(公告)日：2011-07-21

申请号：AU2011203130

申请日：2011-06-28

Applicant: QUALCOMM INC

Inventor： JUAN MONTOJO ,  PRASAD MALLADI DURGA ,  ALEKSANDAR DAMNJANOVIC

IPC: H04W4/00 ,  H04W52/16 ,  H04W52/28 ,  H04W52/32 ,  H04W52/50 ,  H04W74/08

Abstract: Techniques for transmitting random access signaling for system access are described. In an aspect, random access signaling may be sent based on at least one transmission parameter having 5 different values for different user equipment (UE) classes. At least one parameter value may be determined based on a particular UE class, and the random access signaling may be sent based on the determined parameter value(s). The random access signaling may be a random access preamble, and the at least one transmission parameter may include a target SNR, a backoff time, and/or a power ramp. The random access preamble may then be sent based on a target SNR value, a power ramp value, and/or a 0 backoff time value for the particular UE class. In another aspect, a message for system access may be sent based on a power control correction received in a random access response for the random access preamble. co z a) Cl) (D- a) 0 cu of _n a) U) / > _ a) L -0 0 ~ 0 -

公开(公告)号：AU2007316361B2

公开(公告)日：2011-07-14

申请号：AU2007316361

申请日：2007-11-06

Applicant: QUALCOMM INC

Inventor： PRASAD MALLADI DURGA

IPC: H04B7/005 ,  H04B17/00

Abstract: A system and method for inter-cell interference mitigation in FDM systems is provided. The system provides for increased efficiency with load metric data generated per subband for both serving and neighboring non-serving cells. The system robustly provides for sharing load metric date per subband through a backhaul channel as well as directly from cell to adjacent cell. Furthermore, a UE based communication system allows UE reduction of assigned load controls based on directly reading a neighboring cells' load metrics. The system thus robustly handles various cell types (e.g. synchronous or asynchronous) and a variety of UE capabilities while providing increased efficiency in managing inter-cell interference.

公开(公告)号：AU2008216213B2

公开(公告)日：2011-06-23

申请号：AU2008216213

申请日：2008-02-14

Applicant: QUALCOMM INC

Inventor： PRASAD MALLADI DURGA ,  JUAN MONTOJO

IPC: H04B7/005

Abstract: Systems and methodologies are described that facilitate utilizing power control preambles with closed loop power control techniques in a wireless communication environment. An uplink grant can be transferred over a downlink (e.g., a first uplink grant after uplink inactivity), and a power control preamble can be sent over an uplink in response to the uplink grant. According to an example, transmission of the power control preamble can be explicitly scheduled and/or implicitly scheduled. The power control preamble can be transmitted at a power level determined by an access terminal utilizing an open loop power control mechanism. A base station can analyze the power control preamble and generate a power control command based thereupon to correct the power level employed by the access terminal. The access terminal can thereafter utilize the power control command to adjust the power level for uplink data transmission.

公开(公告)号：PH12015502520A1

公开(公告)日：2016-02-29

申请号：PH12015502520

申请日：2015-11-03

Applicant: QUALCOMM INC

Inventor： NAGA BHUSHAN ,  PRASAD MALLADI DURGA ,  YONGBIN WEI ,  PETER GAAL ,  TAO LUO ,  TINGFANG JI ,  BERNARD HORN GAVIN ,  WANSHI CHEN ,  ALEKSANDAR DAMNJANOVIC

IPC: H04W76/02

Abstract: Methods and apparatuses are described for wireless communications. A first method includes transmitting a first Orthogonal Frequency-Division Multiple Access (OFDMA) communications signal to a wireless node in a licensed spectrum, and transmitting, concurrently with the transmission of the first OFDMA communications signal, a second OFDMA communications signal to the wireless node in an unlicensed spectrum. A second method includes receiving a first Orthogonal Frequency-Division Multiple Access (OFDMA) communications signal from a wireless node in a licensed spectrum, and receiving, concurrently with the reception of the first OFDMA communications signal, a second OFDMA communication signal from the wireless node in an unlicensed spectrum. A third method includes generating a periodic gating interval for a cellular downlink in an unlicensed spectrum, and synchronizing at least one boundary of the periodic gating interval with at least one boundary of a periodic frame structure associated with a primary component carrier of the cellular downlink.

公开(公告)号：PH12015502532A1

公开(公告)日：2016-02-22

申请号：PH12015502532

申请日：2015-11-05

Applicant: QUALCOMM INC

Inventor： NAGA BHUSHAN ,  PRASAD MALLADI DURGA ,  YONGBIN WEI ,  PETER GAAL ,  TAO LUO ,  TINGFANG JI ,  BERNARD HORN GAVIN ,  WANSHI CHEN ,  ALEKSANDAR DAMNJANOVIC

IPC: H04W74/08

Abstract: Methods and apparatuses are described in which an unlicensed spectrum is used for Long Term Evolution (LTE) communications. A first method includes synchronizing clear channel assessment (CCA) slots across a plurality of base stations to determine availability of an unlicensed spectrum for transmissions in a next transmission interval. A second method includes performing a CCA during one of a plurality of CCA slots synchronized across a plurality of evolved Node Bs (eNBs) to determine availability of unlicensed spectrum for transmissions in a next transmission interval.

公开(公告)号：MY154923A

公开(公告)日：2015-08-28

申请号：MYPI20091452

申请日：2007-10-31

Applicant: QUALCOMM INC

Inventor： JUAN MONTOJO ,  BYOUNG-HOON KIM ,  PRASAD MALLADI DURGA ,  TAO LUO

IPC: H04B7/204

Abstract: SYSTEMS AND METHODOLOGIES ARE DESCRIBED THAT FACILITATE EFFICIENT CELL ACQUISITION IN A WIRELESS COMMUNICATION SYSTEM. IN ONE ASPECT, A REFERENCE SIGNAL (236) FOR USE IN CELL ACQUISITION CAN BE CONSTRUCTED IN A BANDWIDTH-AGNOSTIC MANNER SUCH THAT IT CONTAINS A COMMON CENTRAL PORTION IN A PREDETERMINED FREQUENCY BAND THAT IS INDEPENDENT OF A BANDWIDTH UTILIZED BY AN ASSOCIATED WIRELESS COMMUNICATION SYSTEM. THE CENTRAL PORTION CAN BE CONSTRUCTED AS A TWO-DIMENSIONAL BLOCK IN TIME AND FREQUENCY THAT SPANS A DEFAULT CELL SEARCH BANDWIDTH, A PREDETERMINED BANDWIDTH SPECIFIED BY SYNCHRONIZATION CODES OR OTHER SIGNALS, OR ANOTHER SUITABLE BANDWIDTH. A REFERENCE SIGNAL CAN THEN BE CONSTRUCTED FORM THE CENTRAL PORTION BY TILING OR EXPANDING THE CENTRAL PORTION SUCH THAT IT SPANS THE ENTIRE SYSTEM BANDWIDTH.