公开(公告)号：US20130051489A1

公开(公告)日：2013-02-28

申请号：US13597073

申请日：2012-08-28

申请人： Jaspreet Singh ,  Sudhir Ramakrishna

发明人： Jaspreet Singh ,  Sudhir Ramakrishna

IPC分类号： H04L27/06 ,  H04L27/00

CPC分类号： H04L25/0212 ,  H04L25/0222 ,  H04L25/0224 ,  H04L27/2647

摘要： Channel time and frequency correlations are determined from OFDM symbols and subframes using appropriately scaled sums of the products of the received pilot symbols at predetermined intervals n in time and/or frequency of resource elements within the resource blocks of the subframes. The correlation estimates may optionally be improved using pilot symbols for a plurality of antennas and for a plurality of pilot signal ports, and across a plurality of subframes. The calculated channel time and frequency correlations may be employed to improve estimates of channel characteristics for purposes such as selection of a transmission mode between a base station and a user equipment on the channel or for the purpose of channel equalization and data demodulation.

摘要翻译： 使用在子帧的资源块内的资源元素的时间和/或频率上以预定间隔n的接收导频符号的乘积的适当缩放和来从OFDM符号和子帧确定信道时间和频率相关。 可以可选地使用用于多个天线和多个导频信号端口以及跨越多个子帧的导频符号来改进相关估计。 可以采用所计算的信道时间和频率相关性来改善信道特性的估计，例如在信道上选择基站和用户设备之间的传输模式，或者用于信道均衡和数据解调的目的。

公开(公告)号：US20100322132A1

公开(公告)日：2010-12-23

申请号：US12776156

申请日：2010-05-07

申请人： Sudhir Ramakrishna ,  Kaushik Josiam

发明人： Sudhir Ramakrishna ,  Kaushik Josiam

IPC分类号： H04W72/04 ,  H04W40/00

CPC分类号： H04L1/0038 ,  H04L1/00 ,  H04L5/0023 ,  H04L5/0037 ,  H04L5/0092 ,  H04L2001/0093

摘要： A base station and subscriber station are capable of communicating with each other in a wireless communication network. The base station allocates resources to the subscriber station through resource allocation messages included in a resource allocation region of a downlink communication. The resource allocation region is partitioned into a plurality of sub-regions. Conventions regarding the arrangement of the resource allocation messages are disclosed which enable the subscriber station to decode the resource allocation messages contained in a sub-region and cease decoding operations upon reaching the end of the sub-region. Accordingly, the subscriber station does not decode resource allocation messages contained in subsequent sub-regions.

摘要翻译： 基站和用户台能够在无线通信网络中相互通信。 基站通过包括在下行链路通信的资源分配区域中的资源分配消息向用户站分配资源。 资源分配区域被划分为多个子区域。 公开了关于资源分配消息的布置的约定，其使订户站能够解码包含在子区域中的资源分配消息，并且在到达子区域的结束时停止解码操作。 因此，用户站不对包含在后续子区域中的资源分配消息进行解码。

公开(公告)号：US20100272036A1

公开(公告)日：2010-10-28

申请号：US12730090

申请日：2010-03-23

申请人： Sudhir Ramakrishna

发明人： Sudhir Ramakrishna

IPC分类号： H04W72/04

CPC分类号： H04L5/0039 ,  H04W72/042 ,  H04W72/0453

摘要： A mobile station and base station are capable of communicating in a wireless network via a set of contiguous or non-contiguous sub-bands. The base station transmits a resource allocation to the mobile station. The resource allocation message includes a sub-band index (SBI) field, a number of messages field, a contiguous allocation indicator field, or a combination of these. Based on the SBI field, one or more of the number of messages field and contiguous allocation indicator field, the mobile station can identify the set of sub-bands allocated to it by the base station.

摘要翻译： 移动台和基站能够经由一组连续的或不连续的子带在无线网络中进行通信。 基站向移动台发送资源分配。 资源分配消息包括子带索引（SBI）字段，消息字段的数量，连续的分配指示符字段或它们的组合。 基于SBI字段，消息字段数量和连续分配指示符字段中的一个或多个，移动台可以识别由基站分配给它的子带集合。

公开(公告)号：US20070223359A1

公开(公告)日：2007-09-27

申请号：US11388638

申请日：2006-03-24

申请人： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok Rudrapatna

发明人： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok Rudrapatna

IPC分类号： H04J11/00

CPC分类号： H04L5/0016 ,  H04B1/71072 ,  H04B2001/71077 ,  H04L5/0007 ,  H04L25/0228 ,  H04L25/03076 ,  H04L27/0008 ,  H04L27/2647

摘要： An improved method is provided for reducing inter-carrier interference in the CDMA subchannels of hybrid OFDMA-CDMA systems. The results of decoding OFDMA tones are used to at least partially cancel interference from CDMA tones. Then, the CDMA tones are decoded. In specific embodiments, control information is obtained by an initial step of decoding the CDMA tones. The control information is used in decoding the OFDMA tones. Then, the decoding of the OFDMA tones and the decoding of the CDMA tones are performed iteratively, such that at least one instance of OFDMA decoding is used to cancel interference from the CDMA tones, and at least one instance of CDMA decoding is used to obtain improved control information for decoding the OFDMA tones.

摘要翻译： 提供了一种用于减少混合OFDMA-CDMA系统的CDMA子信道中的载波间干扰的改进方法。 解码OFDMA音调的结果用于至少部分地消除来自CDMA音调的干扰。 然后，解码CDMA音调。 在具体实施例中，通过解码CDMA音调的初始步骤获得控制信息。 控制信息用于解码OFDMA音调。 然后，迭代地执行OFDMA音调的解码和CDMA音调的解码，使得使用OFDMA解码的至少一个实例来消除来自CDMA音调的干扰，并且使用CDMA解码的至少一个实例来获得 用于解码OFDMA音调的改进的控制信息。

公开(公告)号：US20070155395A1

公开(公告)日：2007-07-05

申请号：US11321721

申请日：2005-12-29

申请人： Nandu Gopalakrishnan ,  Sudhir Ramakrishna ,  Alexandro Salvarani

发明人： Nandu Gopalakrishnan ,  Sudhir Ramakrishna ,  Alexandro Salvarani

IPC分类号： H04Q7/20

CPC分类号： H04W28/18 ,  H04W72/1252

摘要： A scheduling strategy utilizes a total call load metric in place of a reverse signal strength indicator metric for managing reverse link resources. In a disclosed example, a load control module (40) measures the reverse signal strength indicator (62) and measures an active call load (64) using known techniques. A relationship between the reverse signal strength indicator, the active cell load, an other cell load component and a jammer component provides the ability to determine the other cell load component and the jammer component. Once the other cell load component has been determined, a total call load based upon the active cell load component and the other cell load component provides a useful metric for allocating reverse link resources between existing users and for determining whether to allow a new user, for example. In a disclosed example, the total call load at a time for scheduled transmission is estimated based upon recently measured values. The total call load provides an ability to determine an available reverse link resource, which provides an ability to determine how to schedule users desiring to transmit on the reverse link.

摘要翻译： 调度策略利用总呼叫负载量度代替用于管理反向链路资源的反向信号强度指标度量。 在公开的示例中，负载控制模块（40）使用已知技术测量反向信号强度指示器（62）并测量活动呼叫负载（64）。 反向信号强度指示符，活动小区负载，其他小区负载组件和干扰组件之间的关系提供了确定其他小区负载分量和干扰组件的能力。 一旦确定了另一小区负载组件，基于活动小区负载组件和另一个小区负载组件的总呼叫负载提供用于在现有用户之间分配反向链路资源并且用于确定是否允许新用户的有用度量 例。 在公开的示例中，基于最近测量的值估计一次调度传输的总呼叫负载。 总呼叫负载提供了确定可用的反向链路资源的能力，其提供了确定如何调度期望在反向链路上发送的用户的能力。

公开(公告)号：US20070133476A1

公开(公告)日：2007-06-14

申请号：US11298301

申请日：2005-12-09

申请人： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok Rudrapatna

发明人： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok Rudrapatna

IPC分类号： H04B7/216

CPC分类号： H04W28/22

摘要： The present invention provides a method and an apparatus for adapting a data rate that a mobile station indicates to a base station for transmission on a forward link in a cellular system. The method comprises measuring a first value indicative of strength of at least one of a primary and a secondary pilot. The method further comprises compensating the first value indicative of strength of the pilot based on an offset to select a second value indicative of the data rate for the base station. The base station may determine an offset value for compensation and send an indication to the mobile station during the setup of the mobile station. When the mobile station connects to the base station, a measurement of a channel condition (i.e., pilot) may determine a revised data rate for transmission of a next data packet on the forward link. The mobile station may transmit a data rate request on the reverse link using a data rate control channel. Upon the receipt of the request, the base station may use the revised data rate on the forward link for the traffic channel when transmitting packets to the mobile station in the next transmission. Accordingly, the mobile station may provide a data rate control that may adapt the selected data rate in the forward link to at least one varying radio channel condition. In a cellular system, an initial data rate selected by a mobile station may converge to a data rate corresponding to the power of a traffic channel on a forward link so that a base station may transmit data based on one or more instantaneous channel conditions.

摘要翻译： 本发明提供了一种用于使移动台指示给基站的数据速率适应于蜂窝系统中的前向链路上传输的方法和装置。 该方法包括测量指示主飞行员和副驾驶员中的至少一个的强度的第一值。 该方法还包括基于偏移来补偿指示导频的强度的第一值，以选择指示基站的数据速率的第二值。 基站可以确定用于补偿的偏移值，并且在移动站的建立期间向移动台发送指示。 当移动站连接到基站时，信道条件（即，导频）的测量可以确定用于在前向链路上发送下一个数据分组的修改的数据速率。 移动台可以使用数据速率控制信道在反向链路上发送数据速率请求。 在接收到请求时，当在下一个传输中向移动台发送分组时，基站可以使用用于业务信道的前向链路上的修改的数据速率。 因此，移动台可以提供数据速率控制，该数据速率控制可将前向链路中的所选择的数据速率调整到至少一个变化的无线信道条件。 在蜂窝系统中，由移动台选择的初始数据速率可以收敛到与前向链路上的业务信道的功率相对应的数据速率，使得基站可以基于一个或多个瞬时信道条件发送数据。

公开(公告)号：US20070093262A1

公开(公告)日：2007-04-26

申请号：US11256630

申请日：2005-10-21

申请人： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok Rudrapatna

发明人： Shupeng Li ,  Sudhir Ramakrishna ,  Ashok Rudrapatna

IPC分类号： H04M1/00

CPC分类号： H04L5/023 ,  H04J13/00

摘要： The present invention provides a method and an apparatus for transmitting data on an uplink by selectively using multiple access modes to multiplex a transmission based on at least two different transmit formats. A method of wireless communication between at least one mobile station and a base station sector in a cellular system enables a first transmit format for a first transmission of the at least one mobile station on an uplink to the base station sector to multiplex first and second components of the first transmission based on a first access mode. The method further comprises enabling a second transmit format different than the first transmit format for a second transmission on the uplink from the at least one mobile station to multiplex first and second components of the second transmission based on a second access mode. In a spread spectrum cellular system, a base station sector may assign some transmission slots for a non-orthogonal transmission and other transmission slots for an orthogonal transmission to at least one mobile station, for example, in an uplink transmission. At the same time, for example, a base station sector may assign both modes to different mobile stations during the same time slot. By selectively using time and frequency or code division multiplexing, the mobile station may reduce interference, or alternatively, introduce minimal interference associated with multiple mobile stations transmitting data simultaneously at a base station sector. The reduced interference may enhance aggregate throughput of the uplink.

摘要翻译： 本发明提供了一种用于通过选择性地使用多种接入模式来在上行链路上传输数据的方法和装置，用于基于至少两种不同的发送格式复用传输。 蜂窝系统中的至少一个移动站与基站扇区之间的无线通信的方法使得能够在到基站扇区的上行链路上进行至少一个移动站的第一次传输的第一发送格式，以复用第一和第二组件 基于第一访问模式的第一传输。 该方法还包括启用与来自至少一个移动站的上行链路上的第二传输不同于第一发送格式的第二发送格式，以基于第二接入模式来复用第二传输的第一和第二分量。 在扩频蜂窝系统中，例如在上行链路传输中，基站扇区可以为​​非正交传输和用于正交传输的至少一个移动站的一些传输时隙分配一些传输时隙。 同时，例如，基站扇区可以在相同时隙期间将两种模式分配给不同的移动台。 通过选择性地使用时间和频率或码分复用，移动台可以减少干扰，或者替代地，引入与在基站扇区同时发送数据的多个移动台相关联的最小干扰。 减小的干扰可以增强上行链路的聚合吞吐量。

公开(公告)号：US07092731B2

公开(公告)日：2006-08-15

申请号：US10382563

申请日：2003-03-06

申请人： Nandu Gopalakrishnan ,  Sudhir Ramakrishna ,  Ganapathy Subramanian Sundaram

发明人： Nandu Gopalakrishnan ,  Sudhir Ramakrishna ,  Ganapathy Subramanian Sundaram

IPC分类号： H04B7/00 ,  H04Q7/20

CPC分类号： H04W52/32 ,  H04L1/1812 ,  H04W52/16 ,  H04W52/50

摘要： The capacity of a reverse link is improved by realizing a scheme to effect sharp changes in pilot channel transmit power (PCTP) and data channel to pilot power ratio (DCPR), coordinated with the start of the data channel transmission. The change in pilot power and data channel to pilot power ratio is also applicable to mobiles that use multiple pilots and/or multiple antennas at the transmitter and/or receiver.

摘要翻译： 通过实现与数据信道传输开始协调的导频信道发射功率（PCTP）和数据信道到导频功率比（DCPR）的急剧变化的方案来提高反向链路的容量。 导频功率和数据信道对导频功率比的变化也适用于在发射机和/或接收机处使用多个导频和/或多个天线的移动台。

公开(公告)号：US08619688B2

公开(公告)日：2013-12-31

申请号：US12730090

申请日：2010-03-23

申请人： Sudhir Ramakrishna

发明人： Sudhir Ramakrishna

IPC分类号： H04W72/04

CPC分类号： H04L5/0039 ,  H04W72/042 ,  H04W72/0453

摘要： A mobile station and base station are capable of communicating in a wireless network via a set of contiguous or non-contiguous sub-bands. The base station transmits a resource allocation to the mobile station. The resource allocation message includes a sub-band index (SBI) field, a number of messages field, a contiguous allocation indicator field, or a combination of these. Based on the SBI field, one or more of the number of messages field and contiguous allocation indicator field, the mobile station can identify the set of sub-bands allocated to it by the base station.

摘要翻译： 移动台和基站能够经由一组连续的或不连续的子带在无线网络中进行通信。 基站向移动台发送资源分配。 资源分配消息包括子带索引（SBI）字段，消息字段的数量，连续的分配指示符字段或它们的组合。 基于SBI字段，消息字段数量和连续分配指示符字段中的一个或多个，移动台可以识别由基站分配给它的子带集合。

公开(公告)号：US07920469B2

公开(公告)日：2011-04-05

申请号：US11424352

申请日：2006-06-15

申请人： Shupeng Li ,  Shirish Nagaraj ,  Sudhir Ramakrishna ,  Ashok N. Rudrapatna

发明人： Shupeng Li ,  Shirish Nagaraj ,  Sudhir Ramakrishna ,  Ashok N. Rudrapatna

IPC分类号： H04L12/26

CPC分类号： H04W72/0413

摘要： A method and an apparatus for wireless communication between a receiver and a transmitter in a cellular system are provided. The method comprises associating a channel of known structure at the transmitter with the transmission of a first control channel to indicate a variable structure of the first control channel to the receiver.

摘要翻译： 提供了一种在蜂窝系统中的接收机与发射机之间进行无线通信的方法和装置。 该方法包括将发射机处的已知结构的信道与第一控制信道的传输相关联，以指示到接收机的第一控制信道的可变结构。