公开(公告)号：US08666398B2

公开(公告)日：2014-03-04

申请号：US13085372

申请日：2011-04-12

申请人： Madhavan Srinivasan Vajapeyam ,  Aleksandar Damnjanovic ,  Tingfang Ji ,  Osok Song ,  Tao Luo ,  Hao Xu ,  Yongbin Wei ,  Alan Barbieri ,  Durga Prasad Malladi

发明人： Madhavan Srinivasan Vajapeyam ,  Aleksandar Damnjanovic ,  Tingfang Ji ,  Osok Song ,  Tao Luo ,  Hao Xu ,  Yongbin Wei ,  Alan Barbieri ,  Durga Prasad Malladi

IPC分类号： H04W4/00

CPC分类号： H04W74/0833 ,  H04W28/18

摘要： Certain aspects of the present disclosure provide various mechanisms that allow a user equipment to convey information regarding one or more attributes to a base station during a random access (RA) procedure. The attributes may include, for example a capability of the UE (e.g., to support a particular feature or version of a standard) or a condition of the UE (e.g., if it is currently experiencing an interference condition).

摘要翻译： 本公开的某些方面提供了允许用户设备在随机接入（RA）过程期间向基站传送关于一个或多个属性的信息的各种机制。 属性可以包括例如UE的能力（例如，支持标准的特定特征或版本）或UE的条件（例如，如果其当前正在经历干扰条件）。

公开(公告)号：US08553795B2

公开(公告)日：2013-10-08

申请号：US12443796

申请日：2007-10-30

申请人： Hao Xu ,  Durga Prasad Malladi

发明人： Hao Xu ,  Durga Prasad Malladi

IPC分类号： H04B7/02

CPC分类号： H04B7/0413 ,  H04B7/0613 ,  H04B7/0684 ,  H04W52/16 ,  H04W52/325

摘要： Systems and methods facilitate pilot signal design, power control, data rate determination, and channel assignment in the reverse link of a wireless communication system for dynamic scheduling and joint operation in SIMO, SU-MIMO, and MU-MIMO. Pilot signal is based on periodic transmissions of multiple sounding reference sequences for channel estimation. Power control is based on a reference signal at a predetermined power spectral density (PSD) level, and on an offset PSD determined and signaled based on an antenna that transmits the reference signal, other cell interference, and power amplifier headroom. PSD levels for SIMO/MIMO data transmissions are determined based on channel estimates and the predetermined PSD and offset PSD. Such data PSD levels are employed to generate data rates, and to dynamically schedule data streams for communication. Communication resources are conveyed through a channel assignment with an overhead that depends on the maximum multiplexing order of the estimated channel.

摘要翻译： 系统和方法有助于无线通信系统的反向链路中的导频信号设计，功率控制，数据速率确定和信道分配，用于SIMO，SU-MIMO和MU-MIMO中的动态调度和联合操作。 导频信号基于用于信道估计的多个探测参考序列的周期性传输。 功率控制基于预定功率谱密度（PSD）电平的参考信号，以及基于发送参考信号，其它小区干扰和功率放大器余量的天线确定和发信号的偏移PSD。 基于信道估计和预定PSD和偏移PSD确定用于SIMO / MIMO数据传输的PSD电平。 采用这样的数据PSD电平来产生数据速率，并动态调度用于通信的数据流。 通过信道分配来传送通信资源，开销取决于估计信道的最大复用顺序。

公开(公告)号：US08265642B2

公开(公告)日：2012-09-11

申请号：US12816305

申请日：2010-06-15

申请人： Xiaoxia Zhang ,  Durga Prasad Malladi ,  Yongbin Wei ,  Hao Xu ,  Tao Luo

发明人： Xiaoxia Zhang ,  Durga Prasad Malladi ,  Yongbin Wei ,  Hao Xu ,  Tao Luo

IPC分类号： H04W72/00

CPC分类号： H04W74/008 ,  H04W74/004 ,  H04W74/0833

摘要： Systems and methods for processing a physical random access channel are provided. In some embodiments, a method can include: receiving a signal indicative of a strong user and a desired user on a physical random access channel; performing at least one of a single segment frequency domain detection or a multi-segment frequency domain detection on the signal indicative of a strong user and a desired user; generating a residual signal by cancelling out the signal indicative of a strong user; and obtaining a message transmitted by a user equipment by performing at least one of the single segment frequency domain detection or multi-segment frequency domain detection on the residual signal.

摘要翻译： 提供了用于处理物理随机访问信道的系统和方法。 在一些实施例中，方法可以包括：在物理随机接入信道上接收指示强用户和期望用户的信号; 对指示强用户和期望用户的信号执行单段频域检测或多段频域检测中的至少一个; 通过取消指示强用户的信号来产生残差信号; 以及通过对残差信号进行单段频域检测或多段频域检测中的至少一个来获得由用户设备发送的消息。

公开(公告)号：US20110250911A1

公开(公告)日：2011-10-13

申请号：US13084407

申请日：2011-04-11

申请人： Hao Xu ,  Tingfang Ji ,  Renqiu Wang ,  Durga Prasad Malladi ,  Madhavan Srinivasan Vajapeyam

发明人： Hao Xu ,  Tingfang Ji ,  Renqiu Wang ,  Durga Prasad Malladi ,  Madhavan Srinivasan Vajapeyam

IPC分类号： H04W24/00 ,  H04B15/00

CPC分类号： H04W72/082 ,  H04J11/003 ,  H04J11/0056 ,  H04W84/045

摘要： A method of wireless communication includes detecting uplink interference in a received uplink transmission of a user equipment. The received uplink transmission is padded with noise based on the detected interference and also based on a frequency domain partition, whether a subframe is protected, and/or a user equipment type.

摘要翻译： 一种无线通信方法包括检测用户设备接收的上行链路传输中的上行链路干扰。 基于检测到的干扰，并且还基于频域分区，子帧是否受保护，和/或用户设备类型，对所接收的上行链路传输进行填充。

公开(公告)号：US20100029320A1

公开(公告)日：2010-02-04

申请号：US12444575

申请日：2007-11-06

申请人： Durga Prasad Malladi ,  Hao Xu

发明人： Durga Prasad Malladi ,  Hao Xu

IPC分类号： H04B7/00 ,  H04L23/02

CPC分类号： H04W52/367 ,  H04B7/0404 ,  H04L1/0003 ,  H04L5/0023 ,  H04L27/2614 ,  H04W52/146 ,  H04W52/42

摘要： A method for a wireless communication includes receiving or storing a peak to average (PAR) back off value; and applying the PAR back off value to determine the transmission power and rate for SIMO and MIMO transmissions. In one aspect, the PAR back off value is at least partially based on modulation type. In another aspect, the PAR back off value is more for higher order QAM than for QPSK. The power allocation algorithm for different UL MIMO schemes is described as follows. For MIMO without antenna permutation (e.g. per antenna rate control), different PAR back off values are considered for different data streams. For MIMO with antenna permutation or other unitary transformation such as virtual antenna mapping or precoding, the PAR back off are determined based on combined channel. The transmission data rate depends on power and also the receiver algorithms such as a MMSE receiver or MMSE-SIC receiver.

摘要翻译： 一种用于无线通信的方法包括：接收或存储峰值平均值（PAR）回退值; 以及应用PAR回退值来确定SIMO和MIMO传输的传输功率和速率。 在一个方面，PAR回退值至少部分地基于调制类型。 在另一方面，对于高阶QAM而言，PAR倒退值比对于QPSK更多。 不同UL MIMO方案的功率分配算法如下。 对于没有天线排列的MIMO（例如，每个天线速率控制），对不同的数据流考虑不同的PAR后退值。 对于具有天线置换或诸如虚拟天线映射或预编码的其它单位变换的MIMO，基于组合信道确定PAR退避。 传输数据速率取决于功率，还有接收机算法，如MMSE接收机或MMSE-SIC接收机。

公开(公告)号：US20090201869A1

公开(公告)日：2009-08-13

申请号：US12365845

申请日：2009-02-04

申请人： Hao Xu ,  Durga Prasad Malladi ,  Juan Montojo ,  Peter Gaal

发明人： Hao Xu ,  Durga Prasad Malladi ,  Juan Montojo ,  Peter Gaal

IPC分类号： H04W72/00 ,  H04L27/28

CPC分类号： H04L5/0053 ,  H04L1/1671 ,  H04L5/0023 ,  H04L5/0064 ,  H04L5/0092 ,  H04W72/1268

摘要： A communication system incorporates a multiplexing scheme so that a base node that schedules user equipment (UE) can determine whether an ACK/NACK and/or a service request (SR) has been received when both uplink (UL) transmissions are simultaneously scheduled. Significant complexity reduction, better link efficiency, and higher multiplexing capability since the base node can interpret selective use by the UE of either the ACK/NACK or SR UL channel. Such interpretation can be extended to when multiple downlink (DL) transmission modes can be used, specifically DL single input multiple output (SIMO), DL multiple input multiple output (MIMO) with rank 1 transmission, and DL MIMO with rank 2 transmission. Based upon knowledge of the scheduling and DL transmission mode, the base node does not have to blind decode a number of possibilities due to the mapping of possible responses from the UE. In addition, the multiplexing scheme is applicable to FDD and TDD.

摘要翻译： 通信系统包括复用方案，使得调度用户设备（UE）的基站节点可以确定当同时调度上行链路（UL）传输时是否已经接收到ACK / NACK和/或服务请求（SR）。 显着的复杂度降低，更好的链路效率和更高的复用能力，因为基站节点可以解释UE对ACK / NACK或SR UL信道的选择性使用。 这样的解释可以扩展到当可以使用多个下行链路（DL）传输模式时，具体地，具有秩1传输的DL单输入多输出（SIMO），DL多输入多输出（MIMO）和具有秩2传输的DL MIMO。 基于调度和DL传输模式的知识，由于来自UE的可能响应的映射，基本节点不必对许多可能性进行盲解码。 另外，复用方案适用于FDD和TDD。

公开(公告)号：US20090046800A1

公开(公告)日：2009-02-19

申请号：US12181732

申请日：2008-07-29

申请人： Hao Xu ,  Durga Prasad Malladi

发明人： Hao Xu ,  Durga Prasad Malladi

IPC分类号： H04L1/02 ,  H04B7/00 ,  H04L27/00 ,  H04B7/02

CPC分类号： H04L25/03343 ,  H04B7/0617 ,  H04B7/0632 ,  H04B7/0639 ,  H04B7/10 ,  H04L1/0001 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L5/0023 ,  H04L5/0051 ,  H04L5/0053 ,  H04L25/0204 ,  H04L25/0228 ,  H04L25/0248 ,  H04L25/0398 ,  H04L27/0008 ,  H04L27/0012 ,  H04L27/261 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802

摘要： Techniques for sending a MIMO transmission in a wireless communication system are described. In one design, a transmitter sends a first reference signal to a receiver. The receiver selects a precoding matrix based on the first reference signal and in accordance with a selection criterion. The receiver estimates noise and interference at the receiver and determines channel quality indicator (CQI) or modulation and coding scheme (MCS) information based on the precoding matrix and the estimated noise and interference. The receiver sends the CQI or MCS information and a second reference signal to the transmitter. The transmitter selects the precoding matrix based on the second reference signal and in accordance with the same selection criterion used by the receiver. The transmitter then sends a MIMO transmission to the receiver based on the CQI or MCS information obtained from the receiver and the precoding matrix selected by the transmitter.

摘要翻译： 描述了在无线通信系统中发送MIMO传输的技术。 在一种设计中，发射机向接收机发送第一参考信号。 接收机根据第一参考信号并根据选择标准选择预编码矩阵。 接收机估计接收机的噪声和干扰，并且基于预编码矩阵和估计的噪声和干扰来确定信道质量指示符（CQI）或调制和编码方案（MCS）信息。 接收机向发射机发送CQI或MCS信息和第二参考信号。 发射机根据第二参考信号并根据接收机使用的相同选择标准来选择预编码矩阵。 然后，发射机基于从接收机获得的CQI或MCS信息和由发射机选择的预编码矩阵向接收机发送MIMO传输。

公开(公告)号：US20080287155A1

公开(公告)日：2008-11-20

申请号：US12117457

申请日：2008-05-08

申请人： Hao Xu ,  Durga Prasad Malladi ,  Rachel Wang

发明人： Hao Xu ,  Durga Prasad Malladi ,  Rachel Wang

IPC分类号： H04B7/00

CPC分类号： H04L5/0051 ,  H04L5/0007 ,  H04L5/0016 ,  H04L5/0039 ,  H04L5/0053 ,  H04L5/0055 ,  H04L27/2613 ,  H04W52/16 ,  H04W52/241 ,  H04W52/325 ,  H04W52/48

摘要： Techniques for transmitting control information in a wireless communication system are described. The system may support acknowledgement (ACK) channels and channel quality indicator (CQI) channels, which may have different target signal-to-noise ratios (SNRs). The ACK and CQI channels from different user equipments (UEs) may be multiplexed on the same resource block. In one design, the transmit power of a CQI channel may be set to achieve a nominal target SNR for CQI when not multiplexed with the ACK channels and may be reduced to achieve a lower target SNR when multiplexed with the ACK channels. In another design, the transmit power of an ACK channel may be set to achieve a nominal target SNR for ACK when not multiplexed with the CQI channels and may be boosted to achieve a higher target SNR when multiplexed with the CQI channels. The CQI channel may randomly hop to mitigate performance degradation.

摘要翻译： 描述用于在无线通信系统中发送控制信息的技术。 该系统可以支持可能具有不同的目标信噪比（SNR）的确认（ACK）信道和信道质量指示符（CQI）信道。 来自不同用户设备（UE）的ACK和CQI信道可以被复用在相同的资源块上。 在一种设计中，可以设置CQI信道的发射功率，以便在不与ACK信道进行多路复用时实现CQI的标称目标SNR，并且当与ACK信道多路复用时，可以减小目标SNR。 在另一种设计中，可以将ACK信道的发射功率设置为在不与CQI信道进行多路复用时实现用于ACK的标称目标SNR，并且当与CQI信道进行多路复用时可以升高以实现更高的目标SNR。 CQI信道可以随机地跳过以减轻性能下降。

公开(公告)号：US08705441B2

公开(公告)日：2014-04-22

申请号：US12443967

申请日：2007-11-01

申请人： Hao Xu ,  Durga Prasad Malladi

发明人： Hao Xu ,  Durga Prasad Malladi

IPC分类号： H04J11/00 ,  H04W4/00

CPC分类号： H04L5/0007 ,  H04L1/0003 ,  H04L1/0025 ,  H04L1/06 ,  H04L5/0023 ,  H04L5/0039 ,  H04L5/0041 ,  H04L5/006 ,  H04L5/0092 ,  H04L27/2613

摘要： A communication system that facilitates transmissions in accordance with a single-carrier (SC) multiplexing scheme, a multi carrier (MC) multiplexing scheme or a combination thereof is disclosed. Based on various factors such as attributes associated with a UE (user equipment) or availability of resources, a base station can signal to the UE an appropriate multiplexing scheme to be adopted for particular transmissions. The UE can be scheduled for transmission in a semi-static mode wherein the UE employs the transmission scheme for a particular time interval or it may change the mode dynamically for different transmissions. For transmissions from the UE comprising a plurality of data streams with dissimilar attributes, the base station implements a MIMO (multiple input multiple output) system for the UE. This facilitates a UE to dynamically switch between or simultaneously adopt the various multiplexing schemes for communications and thereby fully utilize advantages associated with the different schemes.

摘要翻译： 公开了根据单载波（SC）复用方案，多载波（MC）复用方案或其组合来促进传输的通信系统。 基于诸如与UE相关联的属性（用户设备）或资源可用性等各种因素，基站可以向UE发送要针对特定​​传输采用的适当复用方案。 UE可以以半静态模式进行调度，其中UE在特定时间间隔内采用传输方案，或者可以针对不同的传输动态地改变模式。 对于包括具有不同属性的多个数据流的来自UE的传输，基站为UE实现MIMO（多输入多输出）系统。 这有助于UE在通信之间动态切换或同时采用用于通信的各种复用方案，从而充分利用与不同方案相关的优点。

公开(公告)号：US08559946B2

公开(公告)日：2013-10-15

申请号：US12365872

申请日：2009-02-04

申请人： Hao Xu ,  Juan Montojo ,  Durga Prasad Malladi ,  Peter Gaal

发明人： Hao Xu ,  Juan Montojo ,  Durga Prasad Malladi ,  Peter Gaal

IPC分类号： H04W4/00 ,  H04L27/28

CPC分类号： H04L1/0023 ,  H04L5/0007 ,  H04L5/0053 ,  H04L5/006 ,  H04L5/0064 ,  H04L5/0091

摘要： Systems and methodologies are described that facilitate signaling and detecting discontinuous transmission (DTX) in a wireless communication environment. A DTX indicator and Channel Quality Indicator (CQI) feedback can be multiplexed within a common uplink control channel subframe and transmitted to a base station when the access terminal is operating in DTX mode for an Acknowledgement Channel. Further, when operating in non-DTX mode, the access terminal can multiplex an ACK indicator or a NAK indicator with the CQI feedback within a common uplink control channel subframe, which can thereafter be transferred to the base station. Accordingly, the base station can detect DTX operation or non-DTX operation of the access terminal. For example, reference signal symbols can carry one of the DTX indicator, the ACK indicator, or the NAK indicator. Pursuant to another example, the CQI feedback and the DTX indicator can be combined and carried jointly by non-reference signal symbols.

摘要翻译： 描述了在无线通信环境中促进信令和检测不连续传输（DTX）的系统和方法。 DTX指示符和信道质量指示符（CQI）反馈可以在公共上行链路控制信道子帧内多路复用，并且当接入终端以确认信道的DTX模式工作时被发送到基站。 此外，当在非DTX模式下操作时，接入终端可以在公共上行链路控制信道子帧内将ACK指示符或NAK指示符与CQI反馈复用，然后可以将其传送到基站。 因此，基站可以检测接入终端的DTX操作或非DTX操作。 例如，参考信号符号可以携带DTX指示符，ACK指示符或NAK指示符之一。 根据另一示例，CQI反馈和DTX指示符可以由非参考信号符号组合和携带。