公开(公告)号：US20060104257A1

公开(公告)日：2006-05-18

申请号：US11322538

申请日：2005-12-30

Applicant: Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Hemanth Sampath

Inventor： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Hemanth Sampath

IPC: H04J3/06

CPC classification number: H04L27/2663 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2665 ,  H04L27/2675

Abstract: A method and apparatus for joint time and frequency synchronization for orthogonal frequency division multiplexing (OFDM) systems. A multitone pilot signal is sent in a designated OFDM symbol period. The receiver synchronizes to the pilot signal in a two-stage procedure. The first stage estimates the frequency offset coarsely with a frequency-domain correlation method and estimates the time offset with smoothed time-domain correlation. In a multipath channel, the smoothed time offset estimate is used to locate a cyclic prefix interval which captures the maximum total signal energy. The second stage improves the frequency estimate with a computationally efficient numerical optimization method.

公开(公告)号：US06553019B1

公开(公告)日：2003-04-22

申请号：US09472074

申请日：1999-12-23

Applicant: Rajiv Laroia ,  Junyi Li ,  Sathyadev Venkata Uppala ,  Sundeep Rangan

Inventor： Rajiv Laroia ,  Junyi Li ,  Sathyadev Venkata Uppala ,  Sundeep Rangan

IPC: H04J100

CPC classification number: H04L5/026 ,  H04B1/7136 ,  H04B1/7143 ,  H04L5/0007

Abstract: Tone sequences in a frequency hopping arrangement are generated and assigned by advantageously employing a combination of a sequence generator and a sequence assignor to generate sequences and assign them on a time slot by time slot basis. In a transmitter, the sequence generator and sequence assignor, in combination with a user tone assignor are employed to generate and assign tone sequences to a user on a time slot by time slot basis. In a receiver, the sequence generator and sequence assignor, in combination with a user tone identifier are employed to generate sequences and to identify incoming tone sequences to a user on a time slot by time slot basis. Specifically, the sequence assignment in a time slot is such that a prescribed plurality of sequences is assigned to a particular user. This partitioning of the tasks facilitates the use of a sequence generator that generates sequences with the desirable properties of interference and frequency diversity and, which, leaves the task of properly assigning these sequences among one or more users to the sequence assignor. The sequence assignor functions in such a manner that the interference and frequency diversity properties for the one or more users are preserved, and this is further facilitated by assigning sequences in such a manner that they maximally overlap prior assigned sequences. In one embodiment of the invention, a Latin square based sequence is generated in accordance with a first prescribed process. In a second embodiment of the invention, a Latin cube based sequence is generated in accordance with a second prescribed process. In a third embodiment of the invention, a Latin hypercube of prescribed dimension based sequence is generated in accordance with a third prescribed process. In still another embodiment of the invention, the principles of the invention are employed to realize frequency band hopping.

公开(公告)号：US09402193B2

公开(公告)日：2016-07-26

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: H04W72/08 ,  H04W24/02 ,  H04W84/04

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：US09191840B2

公开(公告)日：2015-11-17

申请号：US11486714

申请日：2006-07-14

Applicant: Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan ,  Prashanth Hande ,  M. Scott Corson ,  Arnab Das

Inventor： Rajiv Laroia ,  Junyi Li ,  Sundeep Rangan ,  Murari Srinivasan ,  Prashanth Hande ,  M. Scott Corson ,  Arnab Das

IPC: H04W24/08 ,  H04B17/345 ,  H04B17/382 ,  H04W72/08

CPC classification number: H04W24/08 ,  H04B17/345 ,  H04B17/382 ,  H04W72/08

Abstract: A wireless terminal receives a broadcast uplink interference report request conveying a requested report type and/or a locally unique base station identifier. The wireless terminal receives and measures broadcast reference signals, e.g., beacon and/or pilot signals, transmitted from a plurality of base station attachment points. Specific type interference reports relate a current serving connection base station attachment point to a selected base station attachment point corresponding to the received base station identifier. Generic type interference reports relate a current serving base station connection attachment point to other unspecified base station attachment points whose broadcast reference signals have been detected by the wireless terminal. Sub-types of generic reports include summation function and maximum function reports. Timing information is sometimes used to determine report sub-type and/or sector type of the selected attachment point. The wireless terminal generates the requested report and transmits it to the current connection attachment point.

Abstract translation: 无线终端接收传送请求的报告类型和/或本地唯一的基站标识符的广播上行链路干扰报告请求。 无线终端接收并测量从多个基站附接点发送的广播参考信号，例如信标和/或导频信号。 特定类型的干扰报告将当前服务连接基站附接点与对应于所接收的基站标识符的所选择的基站附接点相关联。 通用型干扰报告将当前服务基站连接连接点与其广播参考信号已被无线终端检测到的其它未指定的基站附接点相关联。 通用报告的子类型包括求和函数和最大函数报告。 定时信息有时用于确定所选附件点的报告子类型和/或扇区类型。 无线终端生成请求的报告，并将其发送到当前的连接连接点。

公开(公告)号：US08750116B2

公开(公告)日：2014-06-10

申请号：US12268138

申请日：2008-11-10

Applicant: Prashanth Hande ,  Xinzhou Wu ,  Sundeep Rangan

Inventor： Prashanth Hande ,  Xinzhou Wu ,  Sundeep Rangan

IPC: H04L12/26 ,  H04W28/02

CPC classification number: H04W28/02 ,  H04L47/70 ,  H04W72/1252 ,  H04W74/002 ,  H04W84/18

Abstract: Methods and apparatus related to communicating and/or using load information in support of decentralized traffic scheduling decisions are described. Individual wireless terminals corresponding to a peer to peer connection which desire to communicate traffic signals make transmitter yielding and/or receiver yielding decisions on a traffic slot by traffic slot basis. Loading information is used to intentionally skew transmitter yielding decisions in response to conditions and/or needs in the system. A link load weight value is generated based on intended transmitter loading related information and/or intended receiver loading related information. Traffic request parameters and/or link load weight values are communicated between wireless communications devices in request and/or request response signaling. As part of a transmitter yielding decision, one or more of: a spillage value, weighted SINR, and an interference cost estimate is calculated based on: one or more link load weight values and channel condition measurement information.

Abstract translation: 描述了与支持分散式业务调度决策的通信和/或使用负载信息有关的方法和装置。 对应于对等连接的各个无线终端希望传送业务信号使业务时隙基于业务时隙的发射机收敛和/或接收者收益决定。 加载信息用于有意地根据系统中的条件和/或需要来偏移发射机的出错决定。 基于预期的发射机加载相关信息和/或预期的接收机加载相关信息来生成链路负载权重值。 在请求和/或请求响应信令中的无线通信设备之间传送业务请求参数和/或链路负载权重值。 作为发射机产生决定的一部分，基于：一个或多个链路负载权重值和信道条件测量信息来计算溢出值，加权SINR和干扰成本估计中的一个或多个。

公开(公告)号：US08670789B2

公开(公告)日：2014-03-11

申请号：US12730154

申请日：2010-03-23

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：US08411646B2

公开(公告)日：2013-04-02

申请号：US11943517

申请日：2007-11-20

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

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

IPC: H04J3/00

CPC classification number: H04W72/1231 ,  H04W72/1278

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：US08208497B2

公开(公告)日：2012-06-26

申请号：US12339462

申请日：2008-12-19

Applicant: Sundeep Rangan ,  Frank Lane

Inventor： Sundeep Rangan ,  Frank Lane

IPC: H04J3/06

CPC classification number: H04J3/0685 ,  H04L5/0053

Abstract: System and method for providing a timestamp packetized data interface between an RF unit and a modem. According to one embodiment, the RF unit receives an inbound RF signal, processes and demodulates the inbound RF signal to generate samples, generates a timestamp indicative of when the inbound RF signal was received, packetizes and multiplexes the samples and the timestamp, and sends the multiplexed stream to the modem. The modem generates received data from the samples. If the received data type requires a response to be sent at a particular time, the modem generates symbols from responsive outbound data, generates a timestamp which indicates when the outbound data is to be transmitted, packetizes and multiplexes the symbols and the timestamp, and sends the multiplexed stream to the RF unit. The RF unit generates an outbound RF signal from the symbols, and transmits the outbound signal in accordance with the timestamp.

Abstract translation: 用于在RF单元和调制解调器之间提供时间戳分组数据接口的系统和方法。 根据一个实施例，RF单元接收入站RF信号，处理和解调入站RF信号以产生采样，产生指示何时接收到入站RF信号的时间戳，分组并多路复用采样和时间戳，并发送 多路复用流到调制解调器。 调制解调器从样本生成接收到的数据。 如果接收到的数据类型需要在特定时间发送响应，则调制解调器从响应的出站数据生成符号，生成指示何时要发送出站数据的时间戳，分组和多路复用符号和时间戳，并发送 多路复用流到RF单元。 RF单元从符号生成出站RF信号，并根据时间戳发送出站信号。

公开(公告)号：US08160007B2

公开(公告)日：2012-04-17

申请号：US11943512

申请日：2007-11-20

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

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

IPC: H04W4/00

CPC classification number: H04W72/085 ,  H04W72/0406

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：US20110256902A1

公开(公告)日：2011-10-20

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: H04W52/10

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。