公开(公告)号：US20080253319A1

公开(公告)日：2008-10-16

申请号：US12141557

申请日：2008-06-18

申请人： Tingfang Ji ,  Avneesh Agrawal ,  Edward H. Teague

发明人： Tingfang Ji ,  Avneesh Agrawal ,  Edward H. Teague

IPC分类号： H04Q7/00

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“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：US20070197254A1

公开(公告)日：2007-08-23

申请号：US11620033

申请日：2007-01-04

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

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

IPC分类号： H04B7/00 ,  H04Q7/20

CPC分类号： H04W52/247 ,  H04W52/146 ,  H04W52/241 ,  H04W52/243 ,  H04W52/246 ,  H04W52/36 ,  H04W52/54

摘要： Systems and methodologies are described that facilitate serving sector directed transmit power control in a wireless communication environment. Under certain conditions, an access point can have better data with which to determine appropriate power levels than an individual terminal. Accordingly, an access point can transmit power control information to one or more terminals supported by the access point overriding normal power determination procedures. In particular, power control information can be included within an assignment message that designates resources (e.g., frequency, time) assigned to a terminal. Power control information can be based upon SNR, quality of service requirements, interference information, any other relevant information or any combination thereof.

摘要翻译： 描述了在无线通信环境中促进服务于扇区定向发射功率控制的系统和方法。 在某些条件下，接入点可以具有比单个终端确定适当功率级别的更好的数据。 因此，接入点可以将功率控制信息发送到由接入点支持的一个或多个终端覆盖正常功率确定过程。 特别地，功率控制信息可以被包括在指定分配给终端的资源（例如，频率，时间）的分配消息内。 功率控制信息可以基于SNR，服务质量要求，干扰信息，任何其他相关信息或其任何组合。

公开(公告)号：US20050272432A1

公开(公告)日：2005-12-08

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： H04L5/02 ,  H04L12/56 ,  H04W16/14 ,  H04W16/24 ,  H04W72/04 ,  H04Q7/20

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：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：US08897269B2

公开(公告)日：2014-11-25

申请号：US12359992

申请日：2009-01-26

申请人： Tingfang Ji ,  Avneesh Agrawal ,  Alexei Y. Gorokhov

发明人： Tingfang Ji ,  Avneesh Agrawal ,  Alexei Y. Gorokhov

IPC分类号： H04J3/00 ,  H04L5/00 ,  H04W52/32 ,  H04W52/24 ,  H04W52/34 ,  H04L1/00 ,  H04L25/02 ,  H04L1/18

CPC分类号： H04L5/0048 ,  H04L1/0004 ,  H04L1/001 ,  H04L1/0026 ,  H04L1/1812 ,  H04L5/0044 ,  H04L5/005 ,  H04L5/0053 ,  H04L5/0057 ,  H04L5/006 ,  H04L5/0062 ,  H04L25/0224 ,  H04W52/241 ,  H04W52/243 ,  H04W52/325 ,  H04W52/343

摘要： Techniques for mitigating pilot pollution in a wireless network are described. In an aspect, pilot pollution may be mitigated by reducing density and/or transmit power of common pilots whenever possible. A cell may send a common pilot at a first density and a first transmit power level during a first time period and may send the common pilot at a second density and a second transmit power level during a second time period. The second density may be lower than the first density and/or the second transmit power level may be lower than the first transmit power level. Lower density may be achieved by sending the common pilot less frequently, on fewer subcarriers, and/or from fewer antennas. The cell may determine whether to reduce the density and/or transmit power of the common pilot based on network loading, SINRs of terminals, etc. In another aspect, pilot pollution may be mitigated by performing pilot cancellation at a terminal.

摘要翻译： 描述了减轻无线网络中导频污染的技术。 在一方面，可能通过尽可能减少公共飞行员的密度和/或发射功率来减轻飞行员污染。 小区可以在第一时间段期间以第一密度和第一发射功率电平发送公共导频，并且可以在第二时间段期间以第二密度和第二发射功率电平发送公共导频。 第二密度可以低于第一密度，和/或第二发射功率电平可能低于第一发射功率电平。 较低的密度可以通过在较少的子载波上和/或从更少的天线较少频率地发送公共导频来实现。 小区可以基于网络负载，终端的SINR等来确定是否降低公共导频的密度和/或发射功率。另一方面，可以通过在终端执行导频消除来减轻导频污染。

公开(公告)号：US20100020771A1

公开(公告)日：2010-01-28

申请号：US12359992

申请日：2009-01-26

申请人： Tingfang Ji ,  Avneesh Agrawal ,  Alexei Y. Gorokhov

发明人： Tingfang Ji ,  Avneesh Agrawal ,  Alexei Y. Gorokhov

IPC分类号： H04J3/00 ,  H04B7/005

CPC分类号： H04L5/0048 ,  H04L1/0004 ,  H04L1/001 ,  H04L1/0026 ,  H04L1/1812 ,  H04L5/0044 ,  H04L5/005 ,  H04L5/0053 ,  H04L5/0057 ,  H04L5/006 ,  H04L5/0062 ,  H04L25/0224 ,  H04W52/241 ,  H04W52/243 ,  H04W52/325 ,  H04W52/343

摘要： Techniques for mitigating pilot pollution in a wireless network are described. In an aspect, pilot pollution may be mitigated by reducing density and/or transmit power of common pilots whenever possible. A cell may send a common pilot at a first density and a first transmit power level during a first time period and may send the common pilot at a second density and a second transmit power level during a second time period. The second density may be lower than the first density and/or the second transmit power level may be lower than the first transmit power level. Lower density may be achieved by sending the common pilot less frequently, on fewer subcarriers, and/or from fewer antennas. The cell may determine whether to reduce the density and/or transmit power of the common pilot based on network loading, SINRs of terminals, etc. In another aspect, pilot pollution may be mitigated by performing pilot cancellation at a terminal.

摘要翻译： 描述了减轻无线网络中导频污染的技术。 在一方面，可能通过尽可能减少公共飞行员的密度和/或发射功率来减轻飞行员污染。 小区可以在第一时间段期间以第一密度和第一发射功率电平发送公共导频，并且可以在第二时间段期间以第二密度和第二发射功率电平发送公共导频。 第二密度可以低于第一密度，和/或第二发射功率电平可能低于第一发射功率电平。 较低的密度可以通过在较少的子载波上和/或从更少的天线较少频率地发送公共导频来实现。 小区可以基于网络负载，终端的SINR等来确定是否降低公共导频的密度和/或发射功率。另一方面，可以通过在终端执行导频消除来减轻导频污染。

公开(公告)号：US07437164B2

公开(公告)日：2008-10-14

申请号：US10969158

申请日：2004-10-20

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

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

IPC分类号： H04Q7/20

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：US10064179B2

公开(公告)日：2018-08-28

申请号：US12622202

申请日：2009-11-19

申请人： Rajiv Vijayan ,  Avneesh Agrawal ,  Sanjay Jha

发明人： Rajiv Vijayan ,  Avneesh Agrawal ,  Sanjay Jha

IPC分类号： H04L27/26 ,  H04W72/04 ,  H04L5/00 ,  H04W52/34 ,  H04W52/36

CPC分类号： H04W72/0453 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/0066 ,  H04L27/2614 ,  H04W52/343 ,  H04W52/367

摘要： Techniques for managing peak-to-average power ratio (PAPR) for multi-carrier modulation in wireless communication systems. Different terminals in a multiple-access system may have different required transmit powers. The number of carriers to allocate to each terminal is made dependent on its required transmit power. Terminals with higher required transmit powers may be allocated fewer carriers (associated with smaller PAPR) to allow the power amplifier to operate at higher power levels. Terminals with lower required transmit powers may be allocated more carriers (associated with higher PAPR) since the power amplifier is operated at lower power levels. The specific carriers to assign to the terminals may also be determined by their transmit power levels to reduce out-of-band emissions. Terminals with higher required transmit powers may be assigned with carriers near the middle of the operating band, and terminals with lower required transmit powers may be assigned with carriers near the band edges.