公开(公告)号：EP1145585B1

公开(公告)日：2007-02-21

申请号：EP00903289.7

申请日：2000-01-14

申请人： QUALCOMM INCORPORATED

发明人： ESTEVES, Eduardo, A., S. ,  PANKAJ, Rajesh, K. ,  BLACK, Peter, J. ,  GROB, Matthew, S. ,  SINDHUSHAYANA, Nagabhushana, T.

IPC分类号： H04Q7/38

CPC分类号： H04W28/22 ,  H04L1/0002 ,  H04L1/0036 ,  H04L2001/0092 ,  H04W36/18

摘要： A method and apparatus for controlling a data rate associated with the transmission of information from a base station (100) to a mobile station (300) in a mobile radio communication system. The mobile station (300) alternately receives information from a basestation (100) either in a variable rate mode or a fixed rate mode. The transmission rate from a base station (600) in the variable rate mode varies between successive data transmit intervals, and the transmission rate from a base station in the fixed rate mode remains fixed between successive data transmit intervals. Data is transmitted from a first base station (400) to the mobile station in the variable rate mode until the first base station is unable to receive the variable data rate control information from the mobile station. When the first base station (400) is unable to receive the variable data rate control information from the mobile station (300), the mobile station (300) attempts to remain in the variable rate mode by searching for a second base station that will support data transmissions to the mobile station (300) in the variable rate mode and, if the mobile station (300) is able to locate the second base station that will support data transmissions to the mobile station in the variable rate mode, then the second base station transmits data to the mobile station in the variable rate mode and transmissions from the first base station to the mobile station (300) in the variable rate mode terminate. If the mobile station is unable to locate the second base station that will support data transmissions to the mobile station in the variable rate mode, data is transmitted to the mobile station (300) from either the first base station (400) or a different base station in the fixed rate mode.

公开(公告)号：EP1570606B1

公开(公告)日：2006-08-16

申请号：EP02786808.2

申请日：2002-11-26

申请人： QUALCOMM INCORPORATED

发明人： EKVETCHAVIT, Thunyachate ,  SINDHUSHAYANA, Nagabhushana, T. ,  GURELLI, Mehmet ,  BLACK, Peter, J.

IPC分类号： H04L12/56 ,  H03M13/09 ,  H04L7/04

CPC分类号： H04L1/0061 ,  H03M13/09 ,  H04B1/70755 ,  H04B2201/70701 ,  H04J3/0605 ,  H04L1/0045 ,  H04L1/08

摘要： A receiver system determines a current preamble threshold and a current preamble metric and determines whether a preamble is detected. If a preamble is detected, the receiver determines whether an earlier preamble has been detected in an earlier time slot having a common time slot interlace index, and resolves multiple detections of a preamble based on at least one of the current preamble and an old preamble thresholds, the current and an old preamble metrics. The receiver decodes data following the selected preamble and determines the CRC of the decoded data. If a CRC failure is detected, the receiver determines a new current preamble threshold. The new current preamble threshold is larger than the current preamble threshold. If the current preamble metric is larger than the new current preamble threshold, the receiver determines the CRC failure as an actual CRC failure, otherwise as a false CRC failure.

公开(公告)号：EP1302010A2

公开(公告)日：2003-04-16

申请号：EP01951087.4

申请日：2001-06-18

申请人： QUALCOMM INCORPORATED

发明人： SINDHUSHAYANA, Nagabhushana, T. ,  ESTEVES, Eduardo, A., S. ,  ATTAR, Rashid, A. ,  WU, Qiang

IPC分类号： H04L1/00

CPC分类号： H04L1/0002

摘要： A method and an apparatus for adaptive data rate selection in a high data rate (HDR) communication system are disclosed. An exemplary HDR communication system defines a set of data rates, at which an access point (AP) may transmit data packets to an access terminal (AT). The transmission data rate is selected to maintain target packet error rate (PER). Each AT monitors signal quality metric of signals received from APs. An AT receiving forward link signals from multiple ATs identifies the AT associated with the highest quality forward link signal. The AT then evaluates the rate at which a tail probability of error is greater than or equal to a target tail probability of error. The AT then generates a prediction of a first data rate at which the PER of packets received from the identified AP will not exceed the target PER, and a prediction of a second data rate at which the PER of packets received from the selected AP will exceed the target PER. The AT uses the values of the first and second data rates to predict probabilities of selecting the first and the second data rates such that a throughput of the HDR system is maximized and the target PER is achieved. The predicted probabilities are then utilized as biases for a method identifying whether the first data rate or the second data rate will be requested from the AP. The disclosed method and apparatus may be extended to the full set of available data rates.

公开(公告)号：EP0937336B1

公开(公告)日：2009-08-12

申请号：EP97945610.0

申请日：1997-11-06

申请人： QUALCOMM INCORPORATED

发明人： VITERBI, Andrew, J. ,  SINDHUSHAYANA, Nagabhushana, T.

IPC分类号： H03M13/00

CPC分类号： H03M13/3911 ,  H03M13/2957 ,  H03M13/3905 ,  H03M13/3972 ,  H03M13/41 ,  H04L1/005 ,  H04L1/0054 ,  H04L1/0055 ,  H04L1/006

摘要： A soft decision output decoder (20) and decoding method. The decoeder (20) decodes a sequence of signals output by an encoder (12) and transmitted over a channel (17). The soft decision output decoder (20) includes a first "generalized" Viterbi decoder (24) for decoding the sequence of signals received over the channel during a forward iteration through a trellis representing the encoder output having a block length T. The first "generalized" Viterbi decoder (24) begins at an initial state t0 and provides a plurality of forward iteration state metrics alpha for each state at each time interval over a window of length 2L, where L is on the order of a few constraint lengths and 2L is less than a block length T. A second "generalized" Viterbi decoder decodes the sequence of signals received over the channel (17) during a backward iteration through the trellis. The second decoder (26) starts at a second time t2L and provides a plurality of backward iteration state metrics beta for each state at each time interval. A processor (28) then performs a dual maxima computation at each state using the forward state metric, the backward state metric and the branch metric for same to provide a measure of the likelihood that a particular sequence of data was transmitted by the encoder (12). By performing forward and backward Viterbi decoding with dual maxima computations at each node within a window moved over the treillis, the inventive decoder (20) provides the performance benefits associated with a LOG-MAP decoder while avoiding the excessive memory requirements of same.

公开(公告)号：EP1400148A1

公开(公告)日：2004-03-24

申请号：EP02756322.0

申请日：2002-06-25

申请人： QUALCOMM INCORPORATED

发明人： ATTAR, Rashid, Ahmed ,  VIJAYAN, Rajiv ,  SINDHUSHAYANA, Nagabhushana, T.

IPC分类号： H04Q7/38

CPC分类号： H04W36/06 ,  H04L1/20 ,  H04W36/18 ,  H04W52/24 ,  H04W52/26

摘要： Methods and apparatus for an adaptive set management in a communication system are disclosed. Certain levels of an imbalance between a forward link and a reverse link are always present in a communication system. Although severe levels of an imbalance cause a detrimental effect on quality of communication and throughput, the imbalance is an issue only if it degrades throughput by one rate on the forward link. Consequently, an adaptive set management evaluates an imbalance among sectors in a subscriber station's list in accordance with the quality metric of the forward link and the reverse link, and removes from the subscriber station's list only a sector that causes severe imbalance. Although retaining a sector in the subscriber station's list may improve throughput, it may negatively affect other functions of the communication system, e.g., power control. Therefore, a method of power control is modified if a level of imbalance affecting the power control is detected.

公开(公告)号：EP1145501A2

公开(公告)日：2001-10-17

申请号：EP00908270.2

申请日：2000-01-12

申请人： QUALCOMM Incorporated

发明人： PANJAK, Rajesh ,  SINDHUSHAYANA, Nagabhushana, T.

IPC分类号： H04L12/28 ,  H04L12/56 ,  H04Q7/38

CPC分类号： H04L47/14 ,  H04L47/15 ,  H04L47/50 ,  H04L47/522 ,  H04L47/562 ,  H04L47/621 ,  H04L47/6255 ,  H04L47/6265 ,  H04W16/04 ,  H04W72/1221 ,  H04W72/1252 ,  H04W72/1257

摘要： A method and a system for providing security to a network (12) by at least identifying an unauthorized user (20) who is attempting to gain access to a node (16) on the network (12), and preferably by then actively blocking that unauthorized user (20) from further activities. Detection is facilitated by the unauthorized user providing 'earmark', or specially crafted false data, which the unauthorized user (20) gathers during the information collection stage performed before an attack. The earmark is designed such that any attempt by The unauthorized user (20) to use such false data results in the immediate idenfication of the unauthorized user (20) as hostile, and indicates that an intrusion of the network (12) is being attempted. Preferably, further access to the network (12) is then blocked by diverting traffic from the unauthorized user (20) to a secure zone (32), where the activities of the unauthorized user can be contained without damage to the network (12).

摘要翻译： 通信系统中的资源调度器，所述通信系统包括与所述公共节点相关联的公共节点和多个客户节点，所述公共节点在任何特定服务间隔处具有由一个或多个参与客户节点占用的有限资源到所述排除 任何剩余的客户节点，每个客户节点具有消耗有限资源的瞬时速率。 资源调度器包括用于维护与每个客户节点相关联的权重的逻辑; 用于基于与所选择的剩余客户节点相关联的权重与与其他剩余客户节点相关联的相应权重的比较来选择一个或多个剩余客户节点来夺取后续服务间隔中的有限资源的逻辑，后续服务 在当前服务间隔之后的时间间隔，其中有限资源被一个或多个参与客户节点占用; 以及用于基于所选择的客户节点消耗有限资源的瞬时速率来改变所选客户节点的权重的逻辑。 资源调度器还包括用于基于与至少一个客户节点相关联的有限资源的最小平均速率来确定与至少一个客户节点相关联的覆盖时间间隔的覆盖时间间隔的持续时间的超时时间间隔的逻辑 一个客户节点和消耗与所述至少一个客户节点相关联的有限资源的瞬时速率; 以及每当所述至少一个客户节点占用所述有限资源并且每当所述超控时间间隔结束时初始化覆盖时间间隔的逻辑，其中所述用于选择的逻辑调度所述至少一个客户节点以在随后的服务间隔中独立地占用所述有限资源 当每个覆盖时间间隔结束时与客户节点相关联的权重。 还公开了相应的方法。

公开(公告)号：EP0937336A1

公开(公告)日：1999-08-25

申请号：EP97945610.0

申请日：1997-11-06

申请人： QUALCOMM INCORPORATED

发明人： VITERBI, Andrew, J. ,  SINDHUSHAYANA, Nagabhushana, T.

IPC分类号： H03M13 ,  H04L1

CPC分类号： H03M13/3911 ,  H03M13/2957 ,  H03M13/3905 ,  H03M13/3972 ,  H03M13/41 ,  H04L1/005 ,  H04L1/0054 ,  H04L1/0055 ,  H04L1/006

摘要： A soft decision output decoder (20) and decoding method. The decoeder (20) decodes a sequence of signals output by an encoder (12) and transmitted over a channel (17). The soft decision output decoder (20) includes a first 'generalized' Viterbi decoder (24) for decoding the sequence of signals received over the channel during a forward iteration through a trellis representing the encoder output having a block length T. The first 'generalized' Viterbi decoder (24) begins at an initial state t0 and provides a plurality of forward iteration state metrics α for each state at each time interval over a window of length 2L, where L is on the order of a few constraint lengths and 2L is less than a block length T. A second 'generalized' Viterbi decoder decodes the sequence of signals received over the channel (17) during a backward iteration through the trellis. The second decoder (26) starts at a second time t2L and provides a plurality of backward iteration state metrics β for each state at each time interval. A processor (28) then performs a dual maxima computation at each state using the forward state metric, the backward state metric and the branch metric for same to provide a measure of the likelihood that a particular sequence of data was transmitted by the encoder (12). By performing forward and backward Viterbi decoding with dual maxima computations at each node within a window moved over the treillis, the inventive decoder (20) provides the performance benefits associated with a LOG-MAP decoder while avoiding the excessive memory requirements of same.

公开(公告)号：EP1277303B1

公开(公告)日：2012-11-07

申请号：EP01951832.3

申请日：2001-04-18

申请人： QUALCOMM INCORPORATED

发明人： SINDHUSHAYANA, Nagabhushana, T. ,  ATTAR, Rashid, A. ,  ESTEVES, Eduardo, A., S.

IPC分类号： H04L1/20 ,  H04L1/00

CPC分类号： H04L1/0021 ,  H04L1/0002 ,  H04L1/0016 ,  H04L1/002 ,  H04L1/0025 ,  Y02D50/10

摘要： A method and an apparatus for rate control in a high data rate (HDR) communication system are disclosed. An exemplary HDR communication system defines a set of data rates, at which an access point (AP) may send data packets to an access terminal (AT). The data rate is selected to maintain targeted packet error rate (PER). The AT's open loop algorithm measures received signal to interference and noise ratio (SINR) at regular intervals, and uses the information to predict an average SINR over the next packet duration. The AT's closed loop algorithm measures a packet error rate (PER) of the received signal, and uses the PER to calculate a closed loop correction factor. The loop correction factor is added to the SINR value predicted by the open loop, resulting in an adjusted SINR. The AT maintains a look up table, which comprises a set of SINR thresholds that represent a minimum SINR necessary to successfully decode a packet at each data rate. The AT uses the adjusted set of SINR thresholds in the look up table to select the highest data rate, the SINR threshold of which is below the predicted SINR. The AT then requests, over the reverse link, that the AP send the next packet at this data-rate.

公开(公告)号：EP1177640B1

公开(公告)日：2007-05-02

申请号：EP00932256.1

申请日：2000-05-09

申请人： QUALCOMM INCORPORATED

发明人： SINDHUSHAYANA, Nagabhushana, T. ,  ESTEVES, Eduardo, A., S.

IPC分类号： H04B1/707

CPC分类号： H04L27/38 ,  H04B1/712 ,  H04B17/336 ,  H04L25/067 ,  H04L27/34

摘要： A system for providing an accurate interference value signal received over a channel and transmitted by an external transceiver. The system includes a first receiver section for receiving the signal, which has a desired signal component and an interference component. A signal extracting circuit extracts an estimate of the desired signal component from the received signal. A noise estimation circuit (12) provides the accurate interference value based on the estimate of the desired signal component and the received signal. A look-up table transforms the accurate noise and/or interference value to a normalization factor. A carrier signal-to-interference ratio circuit employs the normalization factor and the received signal to compute an accurate carrier signal-to-interference ratio estimate. Path-combining circuitry generates optimal path-combining weights based on the received signal and the normalization factor.

公开(公告)号：EP1214644B1

公开(公告)日：2005-10-26

申请号：EP00959687.5

申请日：2000-08-30

申请人： QUALCOMM INCORPORATED

发明人： LUPIN, Edward, D. ,  SINDHUSHAYANA, Nagabhushana, T.

IPC分类号： G06F7/58

CPC分类号： G06F7/584