公开(公告)号：US20150092556A1

公开(公告)日：2015-04-02

申请号：US14496190

申请日：2014-09-25

Applicant: NEC Laboratories America, Inc.

Inventor： Narayan Prasad ,  Sampath Rangarajan ,  Guosen Yue ,  Yi Xu

IPC: H04B7/04 ,  H04W72/04 ,  H04W28/08 ,  H04L5/00

CPC classification number: H04B7/0452 ,  H04L5/0025 ,  H04L5/0035 ,  H04L5/0037 ,  H04L5/006 ,  H04L5/0062

Abstract: Methods are provided. A method includes determining respective weighted likelihoods corresponding to a plurality of users in a multiple-input multiple-output communication system. The method further includes forming a plurality of user groups from the plurality of users using an iterative K-means clustering technique applied to the plurality of users. The iterative K-means clustering technique is responsive to the respective weighted likelihoods.

Abstract translation: 提供方法。 一种方法包括确定在多输入多输出通信系统中对应于多个用户的各个加权似然度。 该方法还包括使用应用于多个用户的迭代K均值聚类技术从多个用户形成多个用户组。 迭代K均值聚类技术响应各自的加权似然度。

公开(公告)号：US08948120B2

公开(公告)日：2015-02-03

申请号：US14159475

申请日：2014-01-21

Applicant: NEC Laboratories America, Inc.

Inventor： Narayan Prasad ,  Sampath Rangarajan ,  Wenzhuo Ouyang

IPC: H04W4/00 ,  H04L5/00 ,  H04B7/06

CPC classification number: H04L5/0058 ,  H04B7/0626

Abstract: A method for determining an optimal network utilization maximization in a communication system with wireless links in which current and coarse channel state information CSI is available from all users, along with a limited amount of fine CSI by way of a frame based entails a scheduling and feedback under which a virtual queue is associated with each user with virtual rates being determined at start of each frame and policy of each frame being determined by solving a decision process.

Abstract translation: 一种用于确定具有无线链路的通信系统中的最佳网络利用最大化的方法，其中当前和粗略信道状态信息CSI可从所有用户获得，以及通过基于帧的有限量的精细CSI需要调度和反馈 虚拟队列与每个用户相关联，虚拟速率在每个帧的开始处被确定，并且通过解决决策过程来确定每个帧的策略。

公开(公告)号：US20140341064A1

公开(公告)日：2014-11-20

申请号：US14449307

申请日：2014-08-01

Applicant: NEC Laboratories America, Inc.

Inventor： Narayan Prasad ,  Guosen Yue ,  Meilong Jiang ,  Mohammad A. Khojastepour ,  Sampath Rangarajan

IPC: H04W24/10 ,  H04B7/04

CPC classification number: H04W24/10 ,  H04B7/0417 ,  H04B7/0452 ,  H04B7/0469 ,  H04B7/0486 ,  H04B7/0626 ,  H04B7/063 ,  H04B7/065

Abstract: A method implemented in a user equipment configured to be used in a multi-user (MU) multiple-input multiple-output (MIMO) wireless communications system is disclosed. The method includes transmitting to a base station a first channel state information (CSI) report determined according to a single-user (SU) MIMO rule, and transmitting to the base station a second CSI report determined according to an MU-MIMO rule. Other methods, apparatuses, and systems also are disclosed.

Abstract translation: 公开了一种在配置成在多用户（MU）多输入多输出（MIMO）无线通信系统中使用的用户设备中实现的方法。 该方法包括向基站发送根据单用户（SU）MIMO规则确定的第一信道状态信息（CSI）报告，以及向基站发送根据MU-MIMO规则确定的第二CSI报告。 还公开了其它方法，装置和系统。

公开(公告)号：US20140233414A1

公开(公告)日：2014-08-21

申请号：US14248048

申请日：2014-04-08

Applicant: NEC Laboratories America, Inc.

Inventor： Narayan Prasad ,  Guosen Yue ,  Mohammad A. Khojastepour ,  Meilong Jiang ,  Sampath Rangarajan

IPC: H04W24/08

CPC classification number: H04W24/08 ,  H04B7/0452 ,  H04B7/0465 ,  H04B7/0486 ,  H04W52/346 ,  H04W72/0406 ,  H04W72/085

Abstract: A method for determining attributes of communication channels of multi-user (MU)-multiple input multiple output (MIMO) users in an orthogonal frequency division multiplexing based multiple access (OFDMA) system is disclosed. The method comprises receiving from a base station, for at least one sub-band of contiguous sub-carriers, an indication of an estimate of or an upper-bound on a total number of streams that are co-scheduled by the base station on the at least one sub-band or an indication of a fraction of a transmit power at the base station that is applied to streams that are scheduled for transmission to a particular user, determining one or more signal quality measures for the at least one sub-band based on at least one of the fraction or the estimate of or the upper-bound on the total number of streams that are scheduled by the base station on the at least one sub-band, and transmitting to the base station an indication of the one or more signal quality measures. Other methods, apparatuses, and systems also are disclosed.

Abstract translation: 公开了一种用于在基于正交频分复用的多址（OFDMA）系统中确定多用户（MU） - 多输入多输出（MIMO））用户的通信信道的属性的方法。 该方法包括从基站接收对于连续子载波的至少一个子带，在基站上共同调度的流的总数的估计或上限的指示 至少一个子带或基站处的发射功率的一小部分的指示，其被施加到被调度用于传输到特定用户的流，确定用于所述至少一个子带的一个或多个信号质量度量 基于由所述基站在所述至少一个子带上调度的流的总数的分数或估计或上限中的至少一个，并且向所述基站发送所述一个的所述一个 或更多的信号质量措施。 还公开了其它方法，装置和系统。

公开(公告)号：US20140226745A1

公开(公告)日：2014-08-14

申请号：US14258378

申请日：2014-04-22

Applicant: NEC Laboratories America, Inc.

Inventor： Narayan Prasad ,  Guosen Yue ,  Mohammad A. Khojastepour ,  Meilong Jiang ,  Sampath Rangarajan

IPC: H04B7/04 ,  H04L27/34

CPC classification number: H04B7/0452 ,  H04J11/0046 ,  H04L5/0023 ,  H04L25/03331 ,  H04L27/0008 ,  H04L27/0012 ,  H04L27/34 ,  H04W72/042 ,  H04W72/12

Abstract: A method implemented in a user equipment used in a multi-user multiple input multiple output (MU-MIMO) wireless communications system is disclosed. The method includes receiving from a base station an indication of a first modulation type for the user equipment, receiving a first data signal for the user equipment, receiving a second data signal for a co-scheduled user equipment, where a second modulation type for the co-scheduled user equipment is unknown to the user equipment, and deciding the second modulation type. Other methods, systems, and apparatuses also are disclosed.

Abstract translation: 公开了一种在多用户多输入多输出（MU-MIMO）无线通信系统中使用的用户设备中实现的方法。 该方法包括从基站接收用户设备的第一调制类型的指示，接收用户设备的第一数据信号，为共同调度的用户设备接收第二数据信号，其中第二调制类型为 共同调度的用户设备对于用户设备是未知的，并且确定第二调制类型。 还公开了其它方法，系统和装置。

公开(公告)号：US20140204865A1

公开(公告)日：2014-07-24

申请号：US14159475

申请日：2014-01-21

Applicant: NEC Laboratories America , Inc.

Inventor： Narayan Prasad ,  Sampath Rangarajan ,  Wenzhuo Ouyang

IPC: H04L5/00 ,  H04B7/04

CPC classification number: H04L5/0058 ,  H04B7/0626

Abstract: A method for determining an optimal network utilization maximization in a communication system with wireless links in which current and coarse channel state information CSI is available from all users, along with a limited amount of fine CSI by way of a frame based entails a scheduling and feedback under which a virtual queue is associated with each user with virtual rates being determined at start of each frame and policy of each frame being determined by solving a decision process.

Abstract translation: 一种用于确定具有无线链路的通信系统中的最佳网络利用最大化的方法，其中当前和粗略信道状态信息CSI可从所有用户获得，以及通过基于帧的有限量的精细CSI需要调度和反馈 虚拟队列与每个用户相关联，虚拟速率在每个帧的开始处被确定，并且通过解决决策过程来确定每个帧的策略。

公开(公告)号：US20130231059A1

公开(公告)日：2013-09-05

申请号：US13864355

申请日：2013-04-17

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： Narayan Prasad ,  Kishore Ramachandran ,  SAMPATH RANGARAJAN

IPC: H04B7/04

CPC classification number: H04B7/0408 ,  H04B1/1027 ,  H04B7/063 ,  H04B7/0695 ,  H04B7/088

Abstract: A method implemented in a wireless communications system is disclosed. The method includes: transmitting, from a wireless transmitter having a transmit antenna array, a first signal on each of a plurality of different transmit beams in transmitter (TX) sector level sweep (SLS), receiving, at a wireless receiver having a receive antenna array, the first signal, and determining, at the wireless receiver, quality of the first signal. Other methods, systems, and apparatuses also are disclosed.

Abstract translation: 公开了一种在无线通信系统中实现的方法。 该方法包括：在具有发射天线阵列的无线发射机中，在发射机（TX）扇区电平扫描（SLS）中的多个不同发射波束的每一个上发射第一信号，在具有接收天线 阵列，第一信号，以及在无线接收机处确定第一信号的质量。 还公开了其它方法，系统和装置。

公开(公告)号：US20130229992A1

公开(公告)日：2013-09-05

申请号：US13749869

申请日：2013-01-25

Applicant: NEC LABORATORIES AMERICA, INC.

Inventor： Guosen Yue ,  Narayan Prasad ,  Meilong Jiang ,  Sampath Rangarajan

IPC: H04W28/04

CPC classification number: H04W28/044 ,  H04B7/024 ,  H04B7/0486 ,  H04L5/001 ,  H04L5/0035 ,  H04L5/0044 ,  H04L5/0051 ,  H04W74/085

Abstract: A method implemented in a mobile communications network supporting coordinated multiple point transmission and reception (CoMP) is disclosed. The method includes transmitting, to a user equipment (UE), data in a physical downlink shared channel (PDSCH), and transmitting a reference signal to the UE, wherein a union of resource elements (REs) allocated for reference signals transmitted from a subset of a plurality of transmission points (TPs) in a CoMP set are excluded from resource mapping for transmitting the data to the UE. Other methods, systems, and apparatuses also are disclosed.

Abstract translation: 公开了一种在支持协调多点发送和接收（CoMP）的移动通信网中实现的方法。 该方法包括向用户设备（UE）发送物理下行链路共享信道（PDSCH）中的数据，以及向UE发送参考信号，其中分配给用于从子集发送的参考信号的资源元素（RE）的并集 从用于向UE发送数据的资源映射中排除CoMP集合中的多个传输点（TP）。 还公开了其它方法，系统和装置。

公开(公告)号：US10477472B2

公开(公告)日：2019-11-12

申请号：US15271064

申请日：2016-09-20

Applicant: NEC Laboratories America, Inc.

Inventor： Narayan Prasad ,  Sampath Rangarajan ,  Hajar Mahdavi-Doost

IPC: H04W72/12 ,  H04W52/02

Abstract: A method is provided for optimizing energy efficiency over an energy-harvesting Long Term Evolution cellular network. The method includes assigning (a) resource blocks, (b) transmission modes, and (c) bit loadings on the resource blocks to a set of users such that (i) the assigned resource blocks satisfy a system of linear ascending inequality constraints, and (ii) respective sums of the bit loadings for each of the users do not exceed respective queue sizes pertaining to the each of the users. The method further includes incorporating a resource block and transmission mode assignment for a user into downlink scheduler of a base station to cause the downlink scheduler to perform downlink scheduling in accordance with the resource block and transmission mode assignment.

公开(公告)号：US10455636B2

公开(公告)日：2019-10-22

申请号：US15678681

申请日：2017-08-16

Applicant: NEC Laboratories America, Inc.

Inventor： Narayan Prasad ,  Mohammad Khojastepour ,  Sampath Rangarajan ,  Yasaman Ghasempour

IPC: H04W76/04 ,  H04W76/20 ,  H04W24/08 ,  H04B17/336

Abstract: A computer-implemented method for establishing communication links in a millimeter wave (mmWave) network by solving a linear integer packing problem is presented. The computer-implemented method includes determining active communication links between a plurality of transmitters and a plurality of receivers, setting each active communication link to have any arbitrary chosen weight or priority, and setting a minimum link quality threshold for each active communication link and subjecting each active communication link to constraints. Detected phantom constraints are mitigated by introducing new constraints with binary coefficients and by modifying one or more existing constraints by setting a number of coefficients within the existing constraints to zero.