公开(公告)号：US20050271012A1

公开(公告)日：2005-12-08

申请号：US10969158

申请日：2004-10-20

申请人： Avneesh Agrawal ,  Edward Teague ,  Tingfang Ji

发明人： Avneesh Agrawal ,  Edward Teague ,  Tingfang Ji

IPC分类号： H04W36/06 ,  H04W36/18 ,  H04B1/00 ,  H04B15/00 ,  H04J3/16 ,  H04J3/22 ,  H04L12/28 ,  H04Q7/00

CPC分类号： H04W36/18 ,  H04W36/06

摘要： For soft handoff on the reverse link with restrictive reuse, a wireless terminal searches for pilots transmitted by sectors in a wireless system, measures the detected pilots, selects a serving sector (e.g., the strongest received sector), and identifies non-serving sectors that may receive high interference from the terminal. The serving sector assigns the terminal with subband(s) that are usable by the serving sector and unusable by the non-serving sectors. The terminal transmits data symbols on the assigned subbands to the serving and non-serving sectors. These sectors process the reverse link transmission from the terminal and obtain soft-decision symbols, which are estimates of the transmitted data symbols. The soft-decision symbols from co-located sectors may be combined and then decoded to obtain decoded packets. The sectors may also independently decode the soft-decision symbols, and the decoded packets from these sectors may be combined to obtain final decoded packets for the terminal.

摘要翻译： 对于具有限制性重用的反向链路上的软切换，无线终端搜索无线系统中的扇区传输的导频，测量检测到的导频，选择服务扇区（例如，最强的接收扇区），并识别非服务扇区 可能会受到来自终端的高干扰。 服务扇区为终端分配可由服务扇区使用且不能由非服务扇区使用的子带。 终端在分配的子带上发送数据符号给服务扇区和非服务扇区。 这些扇区处理来自终端的反向链路传输，并获得作为发送数据符号的估计的软判决符号。 可以组合来自同位置扇区的软判决符号，然后对其进行解码以获得解码的分组。 这些扇区还可以独立地解码软判决符号，并且可以组合来自这些扇区的解码分组以获得终端的最终解码分组。

公开(公告)号：US20050096062A1

公开(公告)日：2005-05-05

申请号：US10871084

申请日：2004-06-18

申请人： Tingfang Ji ,  Avneesh Agrawal ,  Edward Teague

发明人： Tingfang Ji ,  Avneesh Agrawal ,  Edward Teague

IPC分类号： H04W16/10 ,  H04W16/02 ,  H04W16/12 ,  H04W72/08 ,  H04Q7/20

CPC分类号： H04W16/12 ,  H04W16/02 ,  H04W72/0453 ,  H04W72/082

摘要： For restrictive reuse, each cell (or each sector) is assigned (1) a set of usable subbands that may be allocated to users in the cell and (2) a set of forbidden subbands that is not used. The usable and forbidden sets for each cell are orthogonal to one other. The usable set for each cell also overlaps the forbidden set for each neighboring cell. A user u in a cell x may be allocated subbands in the usable set for that cell. If user u observes/causes high level of interference from/to a neighboring cell y, then user u may be allocated subbands from a “restricted” set containing subbands included in both the usable set for cell x and the forbidden set for cell y. User u would then observe/cause no interference from/to cell y. The subband restriction may be extended to avoid interference from multiple neighboring cells.

摘要翻译： 对于限制性重用，分配每个小区（或每个扇区）（1）可以分配给小区中的用户的一组可用子带，以及（2）未使用的一组禁止子带。 每个单元的可用和禁止的集合彼此正交。 每个单元的可用集合也与每个相邻单元的禁止集重叠。 小区x中的用户u可以被分配给该小区的可用集合中的子带。 如果用户u观察到/来自相邻小区y的高水平的干扰，则可以从包含小区x的可用集合和小区y的禁止集合的包含子带的“受限制”集合中分配用户u的子带。 用户u然后将观察/不造成来自/到小区y的干扰。 可以扩展子带限制以避免来自多个相邻小区的干扰。

公开(公告)号：US20050096061A1

公开(公告)日：2005-05-05

申请号：US10858870

申请日：2004-06-01

申请人： Tingfang Ji ,  Avneesh Agrawal ,  Gavin Horn ,  Edward Teague

发明人： Tingfang Ji ,  Avneesh Agrawal ,  Gavin Horn ,  Edward Teague

IPC分类号： H04W16/02 ,  H04W16/12 ,  H04Q7/20

CPC分类号： H04W16/02 ,  H04W16/12 ,  H04W72/048 ,  H04W72/085

摘要： To reduce inter-sector interference for “weak” users and combat a potentially large variation in interference levels observed by “strong” and weak users, system resources (e.g., frequency subbands) available for data transmission in a system are partitioned into multiple (e.g., three) disjoint sets. Each sector in the system is assigned one subband set. Neighboring sectors are assigned different subband sets such that the subband set assigned to each sector is orthogonal to the subband sets assigned to neighboring sectors. Each sector has an assigned subband set and an unassigned subband set, which contains all subbands not in the assigned set. Weak users in each sector (which are typically strong interferers to neighboring sectors) are allocated subbands in the assigned set. Strong users in each sector are allocated subbands in the unassigned set. The weak users in each sector are then orthogonal to strong interferers in neighboring sectors.

摘要翻译： 为了减少“弱”用户的扇区间干扰，并且打击“强”和弱用户观察到的干扰水平的潜在巨大变化，可用于系统中的数据传输的系统资源（例如，频率子带）被划分为多个（例如， ，三）不相交的集合。 系统中的每个扇区被分配一个子带集。 分配相邻扇区的不同子带组，使得分配给每个扇区的子带集与分配给相邻扇区的子带集正交。 每个扇区具有分配的子带集和未分配的子带集合，其包含不在分配集合中的所有子带。 每个扇区（通常是相邻扇区的强干扰源）中的弱用户在分配集中被分配子带。 每个扇区中的强用户在未分配的集合中分配子带。 每个扇区中的弱用户然后与相邻扇区中的强干扰源正交。

公开(公告)号：US08014781B2

公开(公告)日：2011-09-06

申请号：US10969540

申请日：2004-10-20

申请人： Tingfang Ji ,  Avneesh Agrawal

发明人： Tingfang Ji ,  Avneesh Agrawal

IPC分类号： H04W40/00

CPC分类号： H04W72/082 ,  H04L5/023 ,  H04W16/24 ,  H04W72/085

摘要： To avoid or reduce intra-cell interference, each sector of a cell is associated with a sector-specific set of system resources (e.g., subbands) and at least one non-overlapping common set of system resources. Each common set for each sector includes system resources observing little or no interference from at least one other sector in the cell. The channel condition for a terminal in a given sector x is ascertained based on forward and/or reverse link measurements for the terminal. The terminal is assigned system resources from a common set or a sector-specific set for sector x based on the terminal's channel condition. For example, if the terminal observes high interference from another sector y, then the terminal is assigned system resources from a common set that observes little or no interference from sector y. The techniques may be used for an OFDMA system that uses frequency hopping.

摘要翻译： 为了避免或减少小区内干扰，小区的每个扇区与系统资源（例如子带）的扇区特定集合和至少一个不重叠的公共系统资源集合相关联。 每个扇区的每个公共集合包括观察到小区中至少一个其他扇区几乎或不受干扰的系统资源。 基于终端的前向和/或反向链路测量来确定给定扇区x中的终端的信道条件。 基于终端的信道条件，从通用集或针对扇区x的扇区特定集分配终端。 例如，如果终端观察到来自另一个扇区y的高干扰，则终端从公共集分配系统资源，其观察到来自扇区y的很少或没有干扰。 这些技术可以用于使用跳频的OFDMA系统。

公开(公告)号：US20090197603A1

公开(公告)日：2009-08-06

申请号：US12331156

申请日：2008-12-09

申请人： Tingfang Ji ,  Aamod D. Khandekar ,  Naga Bhushan ,  Alexei Y. Gorokhov ,  Avneesh Agrawal

发明人： Tingfang Ji ,  Aamod D. Khandekar ,  Naga Bhushan ,  Alexei Y. Gorokhov ,  Avneesh Agrawal

IPC分类号： H04W36/00

CPC分类号： H04W36/0083 ,  Y02D70/00 ,  Y02D70/1222 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/146

摘要： Techniques for selecting a serving base station for a terminal in a wireless communication network are described. In one design, multiple candidate base stations for the terminal may be identified, with each candidate base station being a candidate for selection as the serving base station for the terminal. The multiple candidate base stations may include base stations with different transmit power levels and/or may support interference mitigation. One of the multiple candidate base stations may be selected as the serving base station. In one design, the serving base station may be selected based on at least one metric for each candidate base station. The at least one metrics may be for pathloss, effective transmit power, effective geometry, projected data rate, control channel reliability, network utility, etc. The selected candidate base station may have a lower SINR than a highest SINR among the multiple candidate base stations.

摘要翻译： 描述了用于在无线通信网络中为终端选择服务基站的技术。 在一种设计中，可以识别用于终端的多个候选基站，其中每个候选基站是用于选择的候选作为终端的服务基站。 多个候选基站可以包括具有不同发射功率电平的基站和/或可以支持干扰减轻。 可以选择多个候选基站中的一个作为服务基站。 在一种设计中，可以基于每个候选基站的至少一个度量来选择服务基站。 所述至少一个度量可以用于路径损耗，有效发射功率，有效几何，投影数据速率，控制信道可靠性，网络效用等。所选择的候选基站可以具有比多个候选基站中的最高SINR更低的SINR 。

公开(公告)号：US20090149140A1

公开(公告)日：2009-06-11

申请号：US11620030

申请日：2007-01-04

申请人： Mohammad J. Borran ,  Aamod Khandekar ,  Avneesh Agrawal ,  Tingfang Ji

发明人： Mohammad J. Borran ,  Aamod Khandekar ,  Avneesh Agrawal ,  Tingfang Ji

IPC分类号： H04B1/04

CPC分类号： H04W52/247 ,  H04W52/241 ,  H04W52/243 ,  H04W52/60 ,  Y02D70/10

摘要： Systems and methodologies are described that facilitate mitigation of interference in a wireless communication environment. Terminals can utilize interference information provided by neighboring sectors to adjust transmit power and reduce interference. Access points can provide two sets or types of interference information. The first type can be transmitted over a large coverage area, requiring significant overhead and limiting the transmission rate. Access points can also provide a second set or type of interference information directed at smaller coverage area, such as an area proximate to the edge of the supported sector. This second type of interference information can be utilized by terminals that include the access point within their active set. The second set of interference information can be provided at a higher rate than the first set due to decreased overhead requirements. Terminals can utilize both sets of interference information to adjust transmit power.

摘要翻译： 描述了有助于减轻无线通信环境中的干扰的系统和方法。 终端可以利用相邻扇区提供的干扰信息来调整发射功率并减少干扰。 接入点可以提供两组或多种干扰信息。 第一种类型可以在大的覆盖区域上传输，需要大量开销并限制传输速率。 接入点还可以提供针对较小覆盖区域的第二组或干扰类型，例如靠近所支持扇区边缘的区域。 这种第二类型的干扰信息可以由包括其活动集中的接入点的终端利用。 由于降低的开销要求，可以以比第一组更高的速率提供第二组干扰信息。 终端可以利用两组干扰信息来调整发射功率。

公开(公告)号：US20070097935A1

公开(公告)日：2007-05-03

申请号：US11369466

申请日：2006-03-07

申请人： Alexei Gorokhov ,  Tingfang Ji ,  Aamod Khandekar ,  Avneesh Agrawal

发明人： Alexei Gorokhov ,  Tingfang Ji ,  Aamod Khandekar ,  Avneesh Agrawal

IPC分类号： H04Q7/24

CPC分类号： H04W28/22

摘要： Systems and methods are disclosed that facilitate dynamic reverse link rate control by an access terminal and in-band signaling of changes of the reverse link rate by the access terminal.

摘要翻译： 公开了促进接入终端的动态反向链路速率控制和接入终端对反向链路速率变化的带内信令的系统和方法。

公开(公告)号：US09801188B2

公开(公告)日：2017-10-24

申请号：US12260849

申请日：2008-10-29

申请人： Aamod Khandekar ,  Avneesh Agrawal ,  Ashwin Sampath ,  Gavin B. Horn ,  Alexei Gorokhov ,  Naga Bhushan ,  Tingfang Ji

发明人： Aamod Khandekar ,  Avneesh Agrawal ,  Ashwin Sampath ,  Gavin B. Horn ,  Alexei Gorokhov ,  Naga Bhushan ,  Tingfang Ji

IPC分类号： H04W4/00 ,  H04W72/08 ,  H04W52/24 ,  H04W72/04 ,  H04W84/04 ,  H04W92/20

CPC分类号： H04W72/082 ,  H04W52/243 ,  H04W72/0426 ,  H04W84/045 ,  H04W92/20 ,  Y02D70/00

摘要： Providing for interference reduction and/or avoidance utilizing backhaul signaling between wireless access points (APs) of a wireless access network (AN) is described herein. By way of example, an interference avoidance request (IAR) can be issued by an AP to reduce signal interference on forward link (FL) and/or downlink (DL) transmissions by neighboring APs. The IAR can be routed via a backhaul network and/or over-the-air via access terminals (ATs) coupled with the AP or one or more interfering APs. Upon receiving the IAR, an interfering AP can determine reduced transmit power levels for FL and/or RL transmissions and respond to the IAR. The response can include reduced power levels and can be sent via the backhaul network or OTA. By employing the backhaul network in full or in part, interference avoidance can be conducted even for semi-planned or unplanned heterogeneous networks coupled by the backhaul.

公开(公告)号：US09585023B2

公开(公告)日：2017-02-28

申请号：US10858870

申请日：2004-06-01

申请人： Tingfang Ji ,  Avneesh Agrawal ,  Gavin Horn ,  Edward Harrison Teague

发明人： Tingfang Ji ,  Avneesh Agrawal ,  Gavin Horn ,  Edward Harrison Teague

IPC分类号： H04W16/02 ,  H04W16/12 ,  H04W72/04 ,  H04W72/08

CPC分类号： H04W16/02 ,  H04W16/12 ,  H04W72/048 ,  H04W72/085

摘要： To reduce inter-sector interference for “weak” users and combat a potentially large variation in interference levels observed by “strong” and weak users, system resources (e.g., frequency subbands) available for data transmission in a system are partitioned into multiple (e.g., three) disjoint sets. Each sector in the system is assigned one subband set. Neighboring sectors are assigned different subband sets such that the subband set assigned to each sector is orthogonal to the subband sets assigned to neighboring sectors. Each sector has an assigned subband set and an unassigned subband set, which contains all subbands not in the assigned set. Weak users in each sector (which are typically strong interferers to neighboring sectors) are allocated subbands in the assigned set. Strong users in each sector are allocated subbands in the unassigned set. The weak users in each sector are then orthogonal to strong interferers in neighboring sectors.

摘要翻译： 为了减少“弱”用户的扇区间干扰，并且打击“强”和弱用户观察到的干扰水平的潜在巨大变化，可用于系统中的数据传输的系统资源（例如，频率子带）被划分为多个（例如， ，三）不相交的集合。 系统中的每个扇区被分配一个子带集。 分配相邻扇区的不同子带组，使得分配给每个扇区的子带集与分配给相邻扇区的子带集正交。 每个扇区具有分配的子带集和未分配的子带集合，其包含不在分配集合中的所有子带。 每个扇区（通常是相邻扇区的强干扰源）中的弱用户在分配集中被分配子带。 每个扇区中的强用户在未分配的集合中分配子带。 每个扇区中的弱用户然后与相邻扇区中的强干扰源正交。

公开(公告)号：US08700082B2

公开(公告)日：2014-04-15

申请号：US11620030

申请日：2007-01-04

申请人： Mohammad J. Borran ,  Aamod Khandekar ,  Avneesh Agrawal ,  Tingfang Ji

发明人： Mohammad J. Borran ,  Aamod Khandekar ,  Avneesh Agrawal ,  Tingfang Ji

IPC分类号： H04W52/04

CPC分类号： H04W52/247 ,  H04W52/241 ,  H04W52/243 ,  H04W52/60 ,  Y02D70/10

摘要： Systems and methodologies are described that facilitate mitigation of interference in a wireless communication environment. Terminals can utilize interference information provided by neighboring sectors to adjust transmit power and reduce interference. Access points can provide two sets or types of interference information. The first type can be transmitted over a large coverage area, requiring significant overhead and limiting the transmission rate. Access points can also provide a second set or type of interference information directed at smaller coverage area, such as an area proximate to the edge of the supported sector. This second type of interference information can be utilized by terminals that include the access point within their active set. The second set of interference information can be provided at a higher rate than the first set due to decreased overhead requirements. Terminals can utilize both sets of interference information to adjust transmit power.

摘要翻译： 描述了有助于减轻无线通信环境中的干扰的系统和方法。 终端可以利用相邻扇区提供的干扰信息来调整发射功率并减少干扰。 接入点可以提供两组或多种干扰信息。 第一种类型可以在大的覆盖区域上传输，需要大量开销并限制传输速率。 接入点还可以提供针对较小覆盖区域的第二组或干扰类型，例如靠近所支持扇区边缘的区域。 这种第二类型的干扰信息可以由包括其活动集中的接入点的终端利用。 由于降低的开销要求，可以以比第一组更高的速率提供第二组干扰信息。 终端可以利用两组干扰信息来调整发射功率。