公开(公告)号：EP2301282B1

公开(公告)日：2017-03-01

申请号：EP09774441.1

申请日：2009-07-01

Applicant: QUALCOMM Incorporated

Inventor： SUBRAHMANYA, Parvathanathan

IPC: H04W52/32 ,  H04W52/02

CPC classification number: H04W88/08 ,  H04W52/0206 ,  H04W52/244 ,  H04W52/287 ,  H04W52/322 ,  H04W52/325 ,  H04W84/045 ,  Y02D70/1222 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/142 ,  Y02D70/146 ,  Y02D70/164 ,  Y02D70/23

Abstract: The invention relates to a method for facilitating deployment of a low power mode in an access point, AP, base station (600), comprising: determining (606) whether each of at least one access terminal, AT, in at least one defined coverage area is in an idle state; in response to each of the at least one AT being in the idle state, entering (608) the low power mode; and when in the low power mode, varying (610) a transmission power at which the AP base station transmits at least one common channel as a function of time, while maintaining the transmission power at a nominal level with adequate frequency to allow one or more new ATs to detect the AP base station and/or connect to the AP base station and ensuring alignment between the awake period of one or more associated ATs and periods when the transmission power of the AP base station is at the nominal level.

公开(公告)号：EP1642397B1

公开(公告)日：2016-02-24

申请号：EP03763446.6

申请日：2003-07-09

Applicant: QUALCOMM INCORPORATED

Inventor： SUBRAHMANYA, Parvathanathan ,  LIN, Jeremy H c/o Qualcomm Incorporated

IPC: H04B1/707 ,  H04L27/00

CPC classification number: H04B1/712

公开(公告)号：EP2474120B1

公开(公告)日：2014-06-18

申请号：EP10748009.7

申请日：2010-08-17

Applicant: QUALCOMM Incorporated

Inventor： TANG, Jia ,  SALVEKAR, Atul, A. ,  SUBRAHMANYA, Parvathanathan ,  SENDONARIS, Andrew ,  KHARE, Shantanu ,  PARK, Jong Hyeon ,  BANISTER, Brian, Clarke ,  CUI, Tao

IPC: H04L1/06

CPC classification number: H04L1/005 ,  H04L1/06 ,  H04L1/1812 ,  H04L1/1829 ,  H04L25/0204 ,  H04L25/023 ,  H04L25/0244

公开(公告)号：EP2540023A2

公开(公告)日：2013-01-02

申请号：EP11711703.6

申请日：2011-02-24

Applicant: Qualcomm Incorporated

Inventor： CUI, Tao ,  TANG, Jia ,  SENDONARIS, Andrew ,  SALVEKAR, Atul, A. ,  RAO, Subramanya P.N. ,  SUBRAHMANYA, Parvathanathan ,  XIAO, Lei ,  MCCLOUD, Michael, L. ,  BANISTER, Brian, C.

IPC: H04L1/06

CPC classification number: H04L1/005 ,  H04L1/06 ,  H04L25/03242 ,  H04L25/067

Abstract: Methods and apparatus for receiving, processing, and decoding MIMO transmissions in communications systems are described. A non-Gaussian approximation method for simplifying processing complexity where summations are used is described. Use of a priori information to facilitate determination of log likelihood ratios (LLRs) in receivers using iterative decoders is further described. A Gaussian or non-Gaussian approximation method using a priori information may be used to determine a K-best list of values for summation to generate an LLR is also described.

公开(公告)号：EP2443878A1

公开(公告)日：2012-04-25

申请号：EP10740431.1

申请日：2010-06-18

Applicant: QUALCOMM Incorporated

Inventor： KRISHNASWAMY, Dilip ,  KANADE, Parag Mohan ,  SUBRAHMANYA, Parvathanathan

IPC: H04W52/02 ,  H04W48/16 ,  H04W48/18

CPC classification number: H04W52/028 ,  H04W48/16 ,  H04W48/18 ,  H04W52/0229 ,  H04W88/06 ,  Y02D70/122 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/146

Abstract: Apparatus and methods for low power sensing of wireless access technologies are disclosed. In particular, a mobile wireless device, such as an access terminal, may utilize a lower power circuitry portion that operates at a lower power than active circuitry, such as a primary transceiver. The lower power circuitry portion includes a configurable searcher that is capable of sensing if signals of one or more various wireless access technologies are present. When the wireless device utilizes sleep or idle modes for power savings, use of the lower power sensing circuitry to sense the presence of wireless access technologies, rather than using an awoken higher power primary transceiver for sensing, affords increased power savings. An added ability of the lower power circuitry to be put into sleep or idles modes achieves even greater power savings.

公开(公告)号：EP2436212A2

公开(公告)日：2012-04-04

申请号：EP10722475.0

申请日：2010-05-26

Applicant: Qualcomm Incorporated

Inventor： SEIBERT, Cristina A. ,  ROWITCH, Douglas Neal ,  SUBRAHMANYA, Parvathanathan ,  SHEYNBLAT, Leonid

IPC: H04W52/02 ,  H03G3/30 ,  H04B1/707 ,  H04L25/03

CPC classification number: H04W52/0254 ,  H03G3/3078 ,  H04B1/7085 ,  H04B1/7117 ,  H04L25/03019 ,  H04L2025/03566 ,  H04W48/16 ,  Y02D70/122 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/164 ,  Y02D70/40

Abstract: Methods and apparatus are directed to mobile devices utilizing motion and/or position sensors for improving operating performance and/or power efficiency. In one example, a method for reducing power consumption in a mobile device includes receiving movement information, establishing movement data based on the movement information, determining if the mobile device is stationary using the movement data; and reducing the frequency of searching for a base station when the mobile device is stationary. In another example, a mobile device which reduces power consumption based upon movement data includes an RF front end, a receiver coupled to the RF front end, a data demodulator coupled to the receiver, a searcher, coupled to the RF front end and the receiver, which searches for base stations, and a processing unit coupled to the searcher, wherein the processing unit controls the searcher based upon the stationarity of the mobile device.

公开(公告)号：EP1350338B1

公开(公告)日：2011-12-14

申请号：EP02717318.6

申请日：2002-01-11

Applicant: QUALCOMM INCORPORATED

Inventor： RICK, Roland ,  SUBRAHMANYA, Parvathanathan ,  BUTLER, Brian ,  PATEL, Shimman ,  EKVETCHAVIT, Thunachate

IPC: H04B1/707 ,  H04B7/06

CPC classification number: H04B1/7085 ,  H04B1/7115 ,  H04B7/0667 ,  H04B7/0697 ,  H04B2201/70701

Abstract: In an antenna diverstiy environment, the timing offset of the receiver's fingers are based on the timing offset of the received peaks of the base station transmit signals. In a system with non-neglible multipath spacing, the timing offset of the received peaks of the base station transmit signals are not necessarily at the same location. In one embodiment, the demodulating elements for the signal from each base station antenna use the same offset for demodulating and determining an error signal based on pilot signal sampling prior to the timing offset and subsequent to the timing offset. The error signals are averaged and used by a time trackin loop to track the incoming signal. In another embodiment, the demodulating elements for the signal from each base station antenna independently time track the signals with different times offsets for each finger. The preferred embodiment depends on the method used by the base station to multiplex the data onto multiple transmit antennas.

公开(公告)号：EP1949626A1

公开(公告)日：2008-07-30

申请号：EP06839905.4

申请日：2006-11-15

Applicant: QUALCOMM Incorporated

Inventor： MERGEN, Gokhan ,  SETHURAMAN, Vignesh ,  KASTURI, Nitin ,  SUBRAHMANYA, Parvathanathan

IPC: H04L25/02 ,  H04B1/707

CPC classification number: H04L25/0216 ,  H04L25/0218

Abstract: Techniques for deriving a channel impulse response estimate (CIRE) having improved quality are described. A first CIRE with multiple channel taps is obtained based on (1) an initial CIRE derived from a received pilot or (2) a filtered CIRE derived from the initial CIRE. In one aspect, the channel taps in the first CIRE are scaled with multiple scaling factors to obtain a second CIRE. For point-wise LMMSE scaling, the energy of each channel tap is estimated. The noise energy for the channel taps is also estimated, e.g., based on energies of channel taps on one or both edges of the first CIRE. Each channel tap is scaled based on a scaling factor determined by the energy of that channel tap and the noise energy. Each channel tap with energy below a threshold may be set to zero. In another aspect, the second CIRE is obtained by zeroing out selected ones of the channel taps in the first CIRE.

公开(公告)号：EP1523740A2

公开(公告)日：2005-04-20

申请号：EP03761301.5

申请日：2003-06-25

Applicant: QUALCOMM Incorporated

Inventor： SUBRAHMANYA, Parvathanathan

IPC: G08C25/00 ,  G08C25/02 ,  H04L1/14

CPC classification number: H04L1/1809 ,  H04L1/0078 ,  H04L1/1671

Abstract: Methods and apparatus for reducing latency for communication error recovery includes recognizing that an incoming message is due, and requesting retransmission if that message is not properly received. A message is transmitted as two message portions, the first message portion transmitted at a first power level (220), and the second message portion, which is associated with the first message portion, transmitted at a second lower power level (230). The first power level is chosen to provide a predetermined probability that the first message portion will be successfully received. Alternatively, the first and second message portions are transmitted such that the first message portion has a greater energy per bit than does the second message portion. At a first time, the first message portion is received. At a second time, wherein the second time has a known relationship to the first time, a signal is received from which the second message portion is not reliably obtained. The receiving device recognizes that the second message portion was not properly received and requests retransmission of at least the second message portion.

公开(公告)号：EP1350338A2

公开(公告)日：2003-10-08

申请号：EP02717318.6

申请日：2002-01-11

Applicant: QUALCOMM INCORPORATED

Inventor： RICK, Roland ,  SUBRAHMANYA, Parvathanathan ,  BUTLER, Brian ,  PATEL, Shimman ,  EKVETCHAVAT, Thunachate

IPC: H04B1/707 ,  H04B7/06

CPC classification number: H04B1/7085 ,  H04B1/7115 ,  H04B7/0667 ,  H04B7/0697 ,  H04B2201/70701

Abstract: In an antenna diverstiy environment, the timing offset of the receiver's fingers are based on the timing offset of the received peaks of the base station transmit signals. In a system with non-neglible multipath spacing, the timing offset of the received peaks of the base station transmit signals are not necessarily at the same location. In one embodiment, the demodulating elements for the signal from each base station antenna use the same offset for demodulating and determining an error signal based on pilot signal sampling prior to the timing offset and subsequent to the timing offset. The error signals are averaged and used by a time trackin loop to track the incoming signal. In another embodiment, the demodulating elements for the signal from each base station antenna independently time track the signals with different times offsets for each finger. The preferred embodiment depends on the method used by the base station to multiplex the data onto multiple transmit antennas.