公开(公告)号：US09131417B2

公开(公告)日：2015-09-08

申请号：US13743605

申请日：2013-01-17

申请人： Long Gao ,  Joydeep Acharya ,  Sudhanshu Gaur

发明人： Long Gao ,  Joydeep Acharya ,  Sudhanshu Gaur

IPC分类号： H04W36/08 ,  H04W48/02 ,  H04W16/32 ,  H04W48/08

CPC分类号： H04W36/08 ,  H04W16/32 ,  H04W48/02 ,  H04W48/08

摘要： Example implementations are directed to systems and methods based on physical broadcast channel (PBCH) muting are utilized to avoid frequent cell selection/reselection and handover in a LTE-advanced heterogeneous network. In the example implementations, a pico eNB that is fully covered by a macro eNB or other pico eNBs transmits blank PBCH such that it is inaccessible to the UEs who perform cell selection/reselection. Furthermore, a macro eNB may handover a UE to the inaccessible pico eNB by signalling the necessary information to the UE to detect the inaccessible pico eNB. Frequent cell selection/reselection and handover may therefore be avoided in a dense deployment situation.

摘要翻译： 示例性实现涉及基于物理广播信道（PBCH）静音的系统和方法，以避免在LTE高级异构网络中频繁的小区选择/重选和切换。 在示例实现中，完全由宏eNB或其他微微eNB覆盖的微微eNB发送空白PBCH，使得执行小区选择/重选的UE不可访问。 此外，宏eNB可以通过向UE发送必要的信息来检测不可访问的微微eNB，从而将UE切换到不可访问的微微eNB。 因此，在密集部署情况下可以避免频繁的小区选择/重选和切换。

公开(公告)号：US08553639B2

公开(公告)日：2013-10-08

申请号：US13368264

申请日：2012-02-07

申请人： Joydeep Acharya ,  Long Gao ,  Sudhanshu Gaur

发明人： Joydeep Acharya ,  Long Gao ,  Sudhanshu Gaur

IPC分类号： H04W4/00 ,  H04L12/26 ,  H04W72/00 ,  G06F15/173

CPC分类号： H04W72/0446 ,  H04W72/0486

摘要： Systems and methods are directed to deciding the number of subframes in a frame to use for uplink transmission, with the remaining frames used for downlink transmission for a Base Station (BS) in a Time Division Duplexing Long Term Evolution (TDD-LTE). Systems and methods are based on the number of User Equipment (UEs) that the BS has to serve in the uplink and in the downlink, as well as the uplink (UL) and downlink (DL) traffic loads per user. Systems and methods are directed to allowing a TDD LTE BS to partition the subframes in a frame for its UL and DL traffic.

摘要翻译： 系统和方法旨在确定用于上行链路传输的帧中的子帧的数量，其中剩余帧用于时分双工长期演进（TDD-LTE）中的基站（BS）的下行链路传输。 系统和方法基于BS在上行链路和下行链路以及每个用户的上行链路（UL）和下行链路（DL）业务负载中服务的用户设备（UE）的数量。 系统和方法旨在允许TDD LTE BS对其UL和DL业务的帧中的子帧进行分区。

公开(公告)号：US09060377B2

公开(公告)日：2015-06-16

申请号：US13287923

申请日：2011-11-02

申请人： Long Gao ,  Joydeep Acharya ,  Sudhanshu Gaur

发明人： Long Gao ,  Joydeep Acharya ,  Sudhanshu Gaur

IPC分类号： H04Q7/00 ,  H04W72/12 ,  H04W92/20

CPC分类号： H04W72/1226 ,  H04W92/20

摘要： The Long Term Evolution Advanced (LTE-A) network, is a heterogeneous network, where macro and pico base stations (BSs) coexist to improve spectral efficiency per unit area. Systems and methods described herein attempt to provide a solution to the interference coordination problem between macro BSs and pico user equipments (UEs). Specifically, the systems and methods conduct interference coordination based on the concept of almost blank subframe (ABS), which is supported by the LTE-A standard. The macro BSs choose their ABS configurations in a cooperative way such that the overall system throughput is optimized.

摘要翻译： 长期演进高级（LTE-A）网络是一种异构网络，其中宏和微微基站（BS）共存，以提高每单位面积的频谱效率。 本文描述的系统和方法尝试提供宏BS和微微用户设备（UE）之间的干扰协调问题的解决方案。 具体来说，系统和方法基于LTE-A标准支持的几乎空白子帧（ABS）的概念进行干扰协调。 宏BS以协作的方式选择其ABS配置，使得整个系统吞吐量得到优化。

公开(公告)号：US09014109B2

公开(公告)日：2015-04-21

申请号：US13488543

申请日：2012-06-05

申请人： Sudhanshu Gaur ,  Long Gao ,  Joydeep Acharya

发明人： Sudhanshu Gaur ,  Long Gao ,  Joydeep Acharya

IPC分类号： H04W72/04 ,  H04L1/00 ,  H04W72/12

CPC分类号： H04L1/0013 ,  H04L1/005 ,  H04L1/0066 ,  H04L1/0069 ,  H04W72/1231

摘要： A base station (BS) comprises: an interface to receive radio resource management (RRM) measurement from user equipment on received reference signal (RS) strength for each BS of one or more other BSs in a surrounding area of the user equipment; an X2 interface to receive transmission information of almost blank subframes and corresponding cell-specific reference signal (CRS) resource element (RE) locations from the one or more other BSs; and a controller to manage bit-level PDSCH (Physical Downlink Shared Channel) muting information, which includes identifying PDSCH resource elements (REs) that suffer the most from CRS interference arising from other BSs and that are to be subjected to bit-level muting, and allocating to the identified REs a number of bits less than the number of bits allocated to normal REs, and to transfer data with the two levels of bit allocations to various PDSCH REs to the user equipment.

摘要翻译： 基站（BS）包括：接口，用于在用户设备的周围区域中的一个或多个其他BS的每个BS的接收到的参考信号（RS）强度上从用户设备接收无线电资源管理（RRM）测量; 接收来自所述一个或多个其他BS的几乎空白子帧和对应的小区特定参考信号（CRS）资源元素（RE）位置的传输信息的X2接口; 以及用于管理位级PDSCH（Physical Downlink Shared Channel，物理下行链路共享信道）静噪信息的控制器，其包括识别由其他BS产生的CRS干扰遭受最大损害并将遭受比特级静音的PDSCH资源元素（RE） 以及向所识别的RE分配小于分配给正常RE的比特数的比特数，并且将具有两个比特分配级别的数据传送到各个PDSCH RE到用户设备。

公开(公告)号：US09066303B2

公开(公告)日：2015-06-23

申请号：US13532401

申请日：2012-06-25

申请人： Long Gao ,  Joydeep Acharya ,  Sudhanshu Gaur

发明人： Long Gao ,  Joydeep Acharya ,  Sudhanshu Gaur

IPC分类号： H04W52/24 ,  H04B17/345

CPC分类号： H04W52/244 ,  H04B17/345

摘要： Embodiments described herein are directed to a power control scheme for Long Term Evolution Advanced (LTE-A) heterogeneous networks to reduce the interference from macro base stations (BS) to pico user equipment (UE). The embodiments described herein may be used to develop LTE-A heterogeneous networks to balance the achievable throughput between macro and pico UEs and may thereby improve the overall system performance.

摘要翻译： 本文描述的实施例涉及用于长期演进高级（LTE-A）异构网络的功率控制方案，以减少从宏基站（BS）到微微用户设备（UE）的干扰。 本文描述的实施例可以用于开发LTE-A异构网络以平衡宏和微微UE之间的可实现吞吐量，并且因此可以提高整个系统性能。

公开(公告)号：US09020549B2

公开(公告)日：2015-04-28

申请号：US13561766

申请日：2012-07-30

申请人： Joydeep Acharya ,  Long Gao ,  Sudhanshu Gaur

发明人： Joydeep Acharya ,  Long Gao ,  Sudhanshu Gaur

IPC分类号： H04B7/00 ,  H04W88/18

CPC分类号： H04W88/18 ,  H04B7/024 ,  H04B7/0632 ,  H04L1/0026 ,  H04L1/0039 ,  H04L5/0048 ,  H04L5/0057 ,  H04W88/08

摘要： Example embodiments described herein are directed to systems and methods by which a group of base stations (BS) can configure pilot signals in time and time-frequency, using interference management resources (IMR) and/or channel state information reference signal (CSI-RS) resources, so that the user equipment (UE) such as mobiles and laptops can measure certain possible channel quality indicators (CQI) that correspond to specific channel and interference conditions that can arise during actual data submission. Using these values, example embodiments utilize an interpolation algorithm by which the group of base stations can estimate other possible CQI corresponding to a different set of channel and interference conditions.

摘要翻译： 本文描述的示例性实施例涉及使用一组基站（BS）可以使用干扰管理资源（IMR）和/或信道状态信息参考信号（CSI-RS）在时间和时间 - 频率上配置导频信号的系统和方法 ）资源，使得诸如手机和笔记本电脑的用户设备（UE）可以测量与在实际数据提交期间可能出现的特定信道和干扰条件相对应的某些可能的信道质量指示符（CQI）。 使用这些值，示例实施例利用插值算法，通过该算法，基站组可以估计对应于不同的信道和干扰条件集合的其他可能的CQI。

公开(公告)号：US09014737B2

公开(公告)日：2015-04-21

申请号：US13468316

申请日：2012-05-10

申请人： Joydeep Acharya ,  Long Gao ,  Sudhanshu Gaur

发明人： Joydeep Acharya ,  Long Gao ,  Sudhanshu Gaur

IPC分类号： H04B7/00 ,  H04B7/02 ,  H04B7/06

CPC分类号： H04B7/024 ,  H04B7/0632

摘要： Example embodiments described herein are directed to systems and methods by which a group of base stations (BS) can configure pilot signals in time and time-frequency, called channel state information reference signal (CSI-RS) resources, so that the user equipment (UE) such as mobiles and laptops can measure certain possible channel quality indicators (CQI) that correspond to specific channel and interference conditions that can arise during actual data submission. Using these values, example embodiments utilize an interpolation algorithm by which the group of base stations can estimate other possible CQI corresponding to a different set of channel and interference conditions.

摘要翻译： 这里描述的示例性实施例涉及一组基站（BS）可以在时间和时间频率上配置称为信道状态信息参考信号（CSI-RS）资源的导频信号的系统和方法，使得用户设备 移动台和笔记本电脑）可以测量与实际数据提交期间可能出现的特定信道和干扰条件相对应的某些可能的信道质量指示符（CQI）。 使用这些值，示例实施例利用插值算法，通过该算法，基站组可以估计对应于不同的信道和干扰条件集合的其他可能的CQI。

公开(公告)号：US20120082256A1

公开(公告)日：2012-04-05

申请号：US13377866

申请日：2010-03-19

申请人： Sudhanshu Gaur ,  Joydeep Acharya

发明人： Sudhanshu Gaur ,  Joydeep Acharya

IPC分类号： H04B15/00 ,  H04L27/28

CPC分类号： H04B7/0456 ,  H04B7/0426 ,  H04B7/0452 ,  H04B7/0465

摘要： A method for processing user symbols with Tomlinson Harashima precoder (THP) in a base station, of a wireless system having K user terminals (UEs) which communicate with the base station via an uplink channel and corresponding downlink (DL) channel, comprises estimating a DL channel matrix Hk; determining receiver processing matrix Vk; computing an effective matrix DL channel Heff; performing QR decomposition of Heff; computing THP matrices; calculating scalar weights for the UEs; processing user symbols by the THP having the THP matrices to produce an output of filtered vector symbols for the UEs; directing output of the THP to the channel represented by the DL channel matrix through which communications occur in the wireless system with the UEs; performing additional receiver processing on the transmitted signals at the UEs based on Vk for each of the K UEs; and using the scalar weights on the transmitted signals at the UEs.

摘要翻译： 一种用于在具有通过上行链路信道和对应的下行链路（DL）信道与基站进行通信的K个用户终端（UE）的无线系统的基站中用Tomlinson Harashima预编码器（THP）处理用户符号的方法，包括： DL通道矩阵Hk; 确定接收机处理矩阵Vk; 计算有效矩阵DL信道Heff; 执行Heff的QR分解; 计算THP矩阵; 计算UE的标量权重; 通过具有THP矩阵的THP处理用户符号以产生用于UE的滤波后的矢量符号的输出; 将THP的输出引导到由无线系统中与UE通信发生的DL信道矩阵表示的信道; 对于所述K个UE中的每一个，基于V k针对UE发送的信号执行附加的接收机处理; 并且在UE处的发射信号上使用标量权重。

公开(公告)号：US08451944B2

公开(公告)日：2013-05-28

申请号：US13377866

申请日：2010-03-19

申请人： Sudhanshu Gaur ,  Joydeep Acharya

发明人： Sudhanshu Gaur ,  Joydeep Acharya

IPC分类号： H04K1/02 ,  H04L25/03 ,  H04L25/49

CPC分类号： H04B7/0456 ,  H04B7/0426 ,  H04B7/0452 ,  H04B7/0465

摘要： A method for processing user symbols with Tomlinson Harashima precoder (THP) in a base station, of a wireless system having K user terminals (UEs) which communicate with the base station via an uplink channel and corresponding downlink (DL) channel, comprises estimating a DL channel matrix Hk; determining receiver processing matrix Vk; computing an effective matrix DL channel Heff; performing QR decomposition of Heff; computing THP matrices; calculating scalar weights for the UEs; processing user symbols by the THP having the THP matrices to produce an output of filtered vector symbols for the UEs; directing output of the THP to the channel represented by the DL channel matrix through which communications occur in the wireless system with the UEs; performing additional receiver processing on the transmitted signals at the UEs based on Vk for each of the K UEs; and using the scalar weights on the transmitted signals at the UEs.

摘要翻译： 一种用于在具有通过上行链路信道和对应的下行链路（DL）信道与基站进行通信的K个用户终端（UE）的无线系统的基站中用Tomlinson Harashima预编码器（THP）处理用户符号的方法，包括： DL通道矩阵Hk; 确定接收机处理矩阵Vk; 计算有效矩阵DL信道Heff; 执行Heff的QR分解; 计算THP矩阵; 计算UE的标量权重; 通过具有THP矩阵的THP处理用户符号以产生用于UE的滤波后的矢量符号的输出; 将THP的输出引导到由无线系统中与UE通信发生的DL信道矩阵表示的信道; 对于所述K个UE中的每一个，基于V k针对UE发送的信号执行附加的接收机处理; 并且在UE处的发射信号上使用标量权重。

公开(公告)号：US20120046038A1

公开(公告)日：2012-02-23

申请号：US12805769

申请日：2010-08-19

申请人： Long Gao ,  Joydeep Acharya

发明人： Long Gao ,  Joydeep Acharya

IPC分类号： H04W40/00 ,  H04W72/04

CPC分类号： H04W28/16 ,  H04W72/12 ,  H04W88/085

摘要： A central base station for interference management in a distributed antenna system comprises a processor; a memory; and a frequency partition module configured to divide the remote radio heads into clusters and allocate a frequency band to each cluster. Multiple clusters use the same frequency band and groups of clusters are formed. A joint scheduler is configured, for each group, to activate at most two clusters at any given time and deactivate remaining clusters in the group, one of the at most two activated clusters being a serving cluster of the group, and to associate one or more users with the serving cluster in the group. An interference alignment module is configured to apply downlink interference alignment between the at most two activated clusters in each group to align transmit directions of all interferences between the at most two activated clusters.

摘要翻译： 用于分布式天线系统中的干扰管理的中央基站包括处理器; 记忆 以及频率分区模块，被配置为将所述远程无线电头分成群集并且将频带分配给每个群集。 多个群集使用相同的频带，并且形成群组。 配置联合调度器，对于每个组，在任何给定时间激活最多两个集群，并且去激活该组中剩余的集群，最多两个激活的集群中的一个是该组的服务集群，并且关联一个或多个 组中的服务集群的用户。 干扰对准模块被配置为在每个组中的至多两个激活的簇之间应用下行链路干扰对准，以调整最多两个激活的簇之间的所有干扰的发射方向。