公开(公告)号：US08582536B2

公开(公告)日：2013-11-12

申请号：US12630130

申请日：2009-12-03

Applicant: Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan

Inventor： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan

IPC: H04W4/00

CPC classification number: H04B7/0626

Abstract: Methods and apparatus for providing channel diversity to wireless terminals (WTs) in a manner that reduces the latency between the time a WT encounters satisfactory channel conditions are described. A plurality of communications channels with different physical characteristics are maintained in a cell by a base station (BS). Each WT monitors multiple channels and maintains multiple channel estimates at the same time so that rapid switching between channels is possible. Channel quality information is conveyed from each WT to the BS. The WT or BS selects a channel based on the measured channel quality. By supporting multiple channels and by introducing periodic variations into the channels in various embodiments, the time before a WT encounters a channel with good or acceptable channel conditions is minimized even if the WT does not change location. Multiple antennas are used at the BS to support numerous channels simultaneously, e.g., by controlling antenna patterns.

公开(公告)号：US08548515B2

公开(公告)日：2013-10-01

申请号：US13088210

申请日：2011-04-15

Applicant: Samel Celebi ,  Charles Stanski ,  Sundeep Rangan

Inventor： Samel Celebi ,  Charles Stanski ,  Sundeep Rangan

IPC: H04Q7/20

CPC classification number: H04W52/50 ,  H04W52/10 ,  H04W52/146

Abstract: Provided is an feedback mechanism to correct power control information in a broadcast signal that is determined to be incorrect by one or more devices that receive and rely on the broadcast information. A device that receives the incorrect broadcast information can determine a correction and to the information and provide a recommendation to tilt source of the broadcast information. The source can selectively determine whether to modify the broadcast information based on the recommendation from one or more devices. If the broadcast information is modified, subsequent devices that receive the broadcast information are provided with the modified information. If further changes are needed, the subsequent devices can provide further recommended changes.

Abstract translation: 提供了一种反馈机制，用于校正由接收并依赖于广播信息的一个或多个设备确定为不正确的广播信号中的功率控制信息。 接收不正确广播信息的设备可以确定对该信息的校正和提供倾斜广播信息源的建议。 源可以基于来自一个或多个设备的推荐来选择性地确定是否修改广播信息。 如果广播信息被修改，则接收广播信息的后续设备被提供修改的信息。 如果需要进一步的更改，后续设备可以提供进一步的建议更改。

公开(公告)号：US20120099435A1

公开(公告)日：2012-04-26

申请号：US13277124

申请日：2011-10-19

Applicant: Yann Barbotin ,  Ali Hormati ,  Sundeep Rangan ,  Martin Vetterli

Inventor： Yann Barbotin ,  Ali Hormati ,  Sundeep Rangan ,  Martin Vetterli

IPC: H04L12/26

CPC classification number: H04L1/0631 ,  H04B1/7105 ,  H04B1/7113 ,  H04J11/0063 ,  H04L25/0204 ,  H04L27/2647

Abstract: According to a first aspect of the present invention there is provided a method of estimating, jointly, a set of multipath channels having a common path support, the method comprising the steps of, estimating jointly the common path support of the set of multipath channels using a spectral estimation technique, estimating path amplitudes, for each channel in the set of multipath channels, using the estimation of the common path support, to obtain an estimate of the set of multipath channels.

Abstract translation: 根据本发明的第一方面，提供了一种共同估计具有公共路径支持的一组多路径信道的方法，所述方法包括以下步骤：使用以下步骤共同估计所述多路径信道集合的公共路径支持： 频谱估计技术，使用公共路径支持的估计来估计多径信道集合中的每个信道的路径振幅，以获得该多路径信道集合的估计。

公开(公告)号：US08116805B2

公开(公告)日：2012-02-14

申请号：US11611881

申请日：2006-12-17

Applicant: Arnab Das ,  Prashanth Hande ,  Sundeep Rangan ,  Xinzhou Wu

Inventor： Arnab Das ,  Prashanth Hande ,  Sundeep Rangan ,  Xinzhou Wu

IPC: H04B7/00

CPC classification number: H04L1/0002 ,  H04L1/0017 ,  H04L5/023 ,  H04L27/2601 ,  H04W52/26 ,  H04W72/1205 ,  H04W72/1268

Abstract: Systems and methodologies are described that facilitate scheduling transmission, upon an uplink traffic channel in Orthogonal Frequency Division Multiplexing (OFDM) environments. Uplink scheduling may include user selection and rate selection. Further, user selection may be based on a token mechanism that provides control over fairness of allocation to disparate users. Moreover, rate selection may be based upon considerations of uplink interference mitigation.

Abstract translation: 描述了在正交频分复用（OFDM）环境中的上行链路业务信道上促进调度传输的系统和方法。 上行链路调度可以包括用户选择和速率选择。 此外，用户选择可以基于提供对分配给不同用户的公平性的控制的令牌机制。 此外，速率选择可以基于上行链路干扰减轻的考虑。

公开(公告)号：US20110310879A1

公开(公告)日：2011-12-22

申请号：US13218647

申请日：2011-08-26

Applicant: Xinzhou Wu ,  Sundeep Rangan ,  Prashanth Hande ,  Arnab Das ,  Junyi Li

Inventor： Xinzhou Wu ,  Sundeep Rangan ,  Prashanth Hande ,  Arnab Das ,  Junyi Li

IPC: H04W72/04 ,  H04W74/04 ,  H04J3/00

CPC classification number: H04W72/1231 ,  H04W72/1268

Abstract: Systems and methodologies are described that facilitate scheduling uplink transmissions. For instance, a time sharing scheme can be utilized such that differing mobile devices can be scheduled to transmit during differing time slots; however, it is also contemplated that a static scheme can be employed. Pursuant to an illustration, an interference budget can be combined with a time varying weighting factor associated with a base station; the weighting factor can be predefined and/or adaptively adjusted (e.g., based upon a load balancing mechanism). Moreover, the weighted interference budget can be leveraged for selecting mobile devices for uplink transmission (e.g., based at least in part upon path loss ratios of the mobile devices). Further, disparate interference budgets can be utilized by differing channels of a sector at a particular time. Also, for example, a base station can assign a loading factor to be utilized by wireless terminal(s) for generating channel quality report(s).

Abstract translation: 描述了有助于调度上行链路传输的系统和方法。 例如，可以利用时间共享方案，使得不同的移动设备可以被调度为在不同时隙期间进行传输; 然而，也可以考虑采用静态方案。 根据图示，可以将干扰预算与与基站相关联的时变加权因子组合; 加权因子可以被预先定义和/或自适应地调整（例如，基于负载均衡机制）。 此外，加权干扰预算可以用于选择用于上行链路传输的移动设备（例如，至少部分地基于移动设备的路径损耗比率）。 此外，不同的干扰预算可以在特定时间由扇区的不同信道来利用。 此外，例如，基站可以分配要由无线终端利用以产生信道质量报告的负载因子。

公开(公告)号：US07869421B2

公开(公告)日：2011-01-11

申请号：US11486540

申请日：2006-07-14

Applicant: Sundeep Rangan ,  Junyi Li

Inventor： Sundeep Rangan ,  Junyi Li

IPC: H04J3/08

CPC classification number: H04W56/0045 ,  H04L5/003 ,  H04L5/0078 ,  H04L5/0098

Abstract: The claimed subject matter relates to acquiring channel access in a wireless communication environment. A wireless terminal may transmit first and second sets of tones over respective first and second contiguous transmission periods. The first and second tone sets may be disjoint from each other and may each comprise a number of contiguous tones. The terminal may then refrain from transmitting during a third time period in order to receive a grant signal from a base station in response to the access request. The beginnings of the first time period and the second time period may be a function of a determined uplink transmission time.

Abstract translation: 所要求保护的主题涉及在无线通信环境中获取信道接入。 无线终端可以在相应的第一和第二连续传输周期上传送第一和第二组音调。 第一和第二音调集可以彼此不相交，并且可以各自包括多个连续的音调。 然后终端可以在第三时间段期间避免发送，以便响应于接入请求从基站接收授权信号。 第一时间段和第二时间段的开始可以是确定的上行链路传输时间的函数。

公开(公告)号：US07853281B2

公开(公告)日：2010-12-14

申请号：US11487262

申请日：2006-07-14

Applicant: Arnab Das ,  Sundeep Rangan ,  Samel Celebi

Inventor： Arnab Das ,  Sundeep Rangan ,  Samel Celebi

IPC: H04B7/00

CPC classification number: H04W52/56 ,  H04L1/0002 ,  H04L1/0025 ,  H04W52/58

Abstract: Power control reports are communicated less frequently than the power control commands. The base station tracks the commands sent to the wireless terminal and estimates the wireless terminal's control channel transmit power. Received power control channel reports are utilized to compare the base station's estimated wireless terminal control channel transmit power to the actual wireless terminal control channel transmit power. An estimate of the error rate of transmitted power control signals is generated based using the tracked power command information and received power report information. Adjustments are performed in the power control command signaling to compensate for estimated error rates.

Abstract translation: 功率控制报告的传输频率低于功率控制命令。 基站跟踪发送到无线终端的命令，并估计无线终端的控制信道发射功率。 接收的功率控制信道报告用于将基站的估计无线终端控制信道发射功率与实际的无线终端控制信道发射功率进行比较。 使用跟踪功率命令信息和接收功率报告信息生成发送功率控制信号的误码率的估计。 在功率控制命令信号中进行调整，以补偿估计的误码率。

公开(公告)号：US20100238901A1

公开(公告)日：2010-09-23

申请号：US12727155

申请日：2010-03-18

Applicant: Ashwin Sampath ,  Sundeep Rangan ,  Raja Sekhar Bachu

Inventor： Ashwin Sampath ,  Sundeep Rangan ,  Raja Sekhar Bachu

IPC: H04W4/00 ,  H04B7/00

CPC classification number: H04W24/02 ,  H04W72/08 ,  H04W72/082 ,  H04W84/045

Abstract: Systems, apparatus, methods and computer program products are provided. In some embodiments, a method for facilitating interference management in an unplanned wireless communication system is provided. The method can include a non-serving base station obtaining information about a user equipment served by a serving base station; and determining signal information based, at least, in part, on the information. The method can also include the non-serving base station disallowing access to the user equipment due to restricted access rules for the non-serving base station. The method can also include the non-serving base station performing interference management of the user equipment served by the serving base station. The interference management can be performed based, at least, in part, on the determined signal information.

Abstract translation: 提供系统，设备，方法和计算机程序产品。 在一些实施例中，提供了一种用于促进非计划无线通信系统中的干扰管理的方法。 该方法可以包括非服务基站获取关于由服务基站服务的用户设备的信息; 以及至少部分地基于所述信息来确定信号信息。 该方法还可以包括非服务基站由于非服务基站的受限访问规则而不允许对用户设备的访问。 该方法还可以包括非服务基站对由服务基站服务的用户设备进行干扰管理。 可以至少部分地基于确定的信号信息来执行干扰管理。

公开(公告)号：US20100190514A1

公开(公告)日：2010-07-29

申请号：US12751961

申请日：2010-03-31

Applicant: Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Prashanth Hande

Inventor： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Prashanth Hande

IPC: H04W68/02

CPC classification number: H04W68/025 ,  Y02D70/00

Abstract: Methods and apparatus for efficient two-stage paging wireless communications systems are described. Wireless terminals are assigned to paging groups. A few first paging message information bits are modulated (using non-coherent modulation) into a first paging signal and communicated from a base station to wireless terminals. WTs wake-up, receive the first paging signal and quickly ascertain whether its paging group should expect a second paging signal, if so, the WT is operated to receive the second paging signal; otherwise, the WT goes back to sleep conserving power. The base station modulates (using coherent modulation) a number of second message information bits into a second paging signal and transmits the signal to WTs. From the information in first and second paging signals, a WT can determine that it is the paged WT and process the paging instructions. The intended paged WT can transmit an acknowledgement signal on a dedicated uplink resource.

Abstract translation: 描述了用于有效的两阶段寻呼无线通信系统的方法和装置。 无线终端被分配给寻呼组。 几个第一寻呼消息信息比特被调制（使用非相干调制）到第一寻呼信号中并从基站传送到无线终端。 WT唤醒，接收第一个寻呼信号，并快速确定其寻呼组是否应该预期第二个寻呼信号，如果是，则操作WT接收第二寻呼信号; 否则，WT回去睡眠节省电力。 基站将多个第二消息信息比特（使用相干调制）调制成第二寻呼信号，并将该信号发送给WT。 根据第一和第二寻呼信号中的信息，WT可以确定它是寻呼WT并处理寻呼指令。 预期的寻呼WT可以在专用上行链路资源上发送确认信号。

公开(公告)号：US07756548B2

公开(公告)日：2010-07-13

申请号：US11229846

申请日：2005-09-19

Applicant: Rajiv Laroia ,  Pablo Anigstein ,  Arnab Das ,  Sundeep Rangan

Inventor： Rajiv Laroia ,  Pablo Anigstein ,  Arnab Das ,  Sundeep Rangan

IPC: H04W52/00 ,  H04W88/08

CPC classification number: H04W56/00 ,  H04B7/2678 ,  H04L5/0007 ,  H04L5/0048 ,  H04L5/0053 ,  H04W52/0206 ,  H04W72/1278 ,  Y02D70/449

Abstract: A multi-mode base station includes a transmit standby mode and an active mode. Transmit standby mode of base station operation is a low power/low interference level of operation as compared to active mode. In transmit standby mode at least some of the synchronization signaling such as pilot tone signaling is reduced in power level and/or rate with respect to the active mode. In transmit standby mode, the base station has no active state registered wireless terminals being serviced but may have some sleep state registered wireless terminals being serviced. Mode transitions from active to transmit standby may be in response to: a detected period of inactivity, scheduling information, base station mode change signals, and/or detected wireless terminal state transition. Mode transitions from transmit standby to active may be in response to: scheduling information, access signals, wake-up signals, hand-off signals, wireless terminal state change signals, and/or base station mode change signals.

Abstract translation: 多模式基站包括发送待机模式和活动模式。 与主动模式相比，基站操作的发送待机模式是低功耗/低干扰电平。 在发送待机模式中，诸如导频音调信令的至少一些同步信令相对于活动模式降低功率电平和/或速率。 在发送待机模式中，基站没有被激活状态登记的无线终端被服务，但是可能有一些睡眠状态登记的无线终端被维护。 模式从有效切换到发送备用的转换可以是：检测到的不活动时段，调度信息，基站模式改变信号和/或检测到的无线终端状态转换。 从发射待机状态转换为有效的模式可以响应于：调度信息，接入信号，唤醒信号，切换信号，无线终端状态改变信号和/或基站模式改变信号。