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公开(公告)号：US20100061341A1
公开(公告)日：2010-03-11
申请号：US12617549
申请日：2009-11-12
申请人： Tingfang Li , Avneesh Agrawal
发明人： Tingfang Li , Avneesh Agrawal
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。
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公开(公告)号：US08700045B2
公开(公告)日：2014-04-15
申请号：US12617549
申请日：2009-11-12
申请人： Tingfang Li , Avneesh Agrawal
发明人： Tingfang Li , 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。
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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
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.
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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
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.
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公开(公告)号：US09668265B2
公开(公告)日：2017-05-30
申请号：US12409358
申请日：2009-03-23
CPC分类号： H04W72/082 , H04L1/0036 , H04W52/243 , H04W52/40
摘要： Techniques for mitigating interference in a wireless communication network are described. A terminal may desire to communicate with a weaker serving base station and may observe high interference from a strong interfering base station. The two base stations may be asynchronous and have different frame timing. In an aspect, high interference may be mitigated by having the interfering base station reserve downlink and/or uplink resources. The interfering base station may transmit at a low power level or not at all on the reserved downlink resources to reduce interference to the terminal. Terminals served by the interfering base station may transmit at a low power level or not at all on the reserved uplink resources to reduce interference at the serving base station. The terminal may then be able to communicate with the serving base station.
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公开(公告)号：US09585023B2
公开(公告)日：2017-02-28
申请号：US10858870
申请日：2004-06-01
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。
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公开(公告)号：US20150312895A1
公开(公告)日：2015-10-29
申请号：US14789332
申请日：2015-07-01
申请人： Aamod Khandekar , Juan Montojo , Avneesh Agrawal
发明人： Aamod Khandekar , Juan Montojo , Avneesh Agrawal
IPC分类号： H04W72/04
CPC分类号： H04W72/0406 , H04L5/0073 , H04W16/14 , H04W72/042 , H04W72/044 , H04W88/06 , H04W88/10
摘要： Systems and methodologies are described that facilitate defining new control channels in legacy wireless networks. Control data resources for new systems can be defined over resources reserved for general data communications in the legacy wireless network specification. In this regard, legacy devices can still be supported by devices implementing new control data resources, and the new control data resources can avoid substantial interference that is typically exhibited over legacy control and/or reference signal resources by instead using the general data resources. In addition, new system devices can avoid scheduling data communication resources over the new control resources to create a substantially non-interfered global control segment. Control data can be transmitted over the segment using beacon-based technologies, reuse schemes, and/or the like.
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公开(公告)号：US09100076B2
公开(公告)日：2015-08-04
申请号：US13550549
申请日：2012-07-16
CPC分类号： H04B7/0671 , H04B7/0417 , H04B7/0632 , H04B7/0673 , H04L1/0003 , H04L1/0009 , H04L1/0026 , H04L1/0071 , H04L1/0618 , H04L25/0224 , H04L27/2602 , H04L27/2607 , H04L27/2631 , H04L27/2647 , H04W52/42
摘要： Methods and apparatuses that apply a time-varying delay to symbols to be transmitted from one or more antennas are provided. In a first embodiment, first and second transmission orders for samples in first and second data symbols, respectively, are determined. First and second cyclic prefixes are appended to the beginnings of the first and second transmission orders, respectively. The first and second data symbols are then provided to the same antenna for transmissions beginning at different time slots in accordance with a delay diversity scheme. In a second embodiment, either the first data symbol or the second data symbol can be provided to different antennas for transmissions beginning at different time slots in accordance with a delay diversity scheme.
摘要翻译： 提供了对从一个或多个天线发送的符号应用时变延迟的方法和装置。 在第一实施例中，分别确定第一和第二数据符号中的采样的第一和第二传输顺序。 第一和第二循环前缀分别附加到第一和第二传输命令的开头。 然后根据延迟分集方案，将第一和第二数据符号提供给相同的天线，用于在不同时隙开始的传输。 在第二实施例中，根据延迟分集方案，可以将第一数据符号或第二数据符号提供给不同的天线以用于在不同时隙开始的传输。
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公开(公告)号：US09084201B2
公开(公告)日：2015-07-14
申请号：US12357698
申请日：2009-01-22
CPC分类号： H04W52/16 , H04W52/243 , H04W52/246 , H04W52/367
摘要： Systems and methodologies are described that facilitate power headroom management in a wireless communication system. As described herein, a predefined relationship between locations along a system frequency band and corresponding power backoff parameters is utilized to minimize spurious emissions outside the system frequency band and/or excessive interference by, for example, associating locations near one or more edges of the permitted frequency band with substantially high power backoff parameters. As further described herein, the predefined relationship can be known a priori to the base station and the mobile terminal.
摘要翻译： 描述了在无线通信系统中促进功率余量管理的系统和方法。 如本文所述，利用沿着系统频带的位置和相应的功率回退参数之间的预定义关系来最小化系统频带外的杂散发射和/或过度干扰，例如通过允许的一个或多个边缘附近的相关位置 频带具有基本上高功率的退避参数。 如本文进一步描述的，预先确定的关系可以在基站和移动终端之前是已知的。
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公开(公告)号：US08982851B2
公开(公告)日：2015-03-17
申请号：US12651838
申请日：2010-01-04
申请人： Avneesh Agrawal , Ashwin Sampath , Ravi Palanki , Naga Bhushan , Raja Sekhar Bachu , Aamod D. Khandekar
发明人： Avneesh Agrawal , Ashwin Sampath , Ravi Palanki , Naga Bhushan , Raja Sekhar Bachu , Aamod D. Khandekar
CPC分类号： H04L5/005 , H04L1/1893 , H04L5/0048 , H04L5/0082 , H04W72/005 , H04W72/1247
摘要： Systems and methodologies are described that facilitate providing high reuse for transmitting reference signals, such as positioning reference signals (PRS) and cell-specific reference signals (CRS), to improve hearability thereof for applications such as trilateration and/or the like. In particular, PRSs can be transmitted in designated or selected positioning subframes. Resource elements within the positioning subframe can be selected for transmitting the PRSs and can avoid conflict with designated control regions, resource elements used for transmitting cell-specific reference signals, and/or the like. Resource elements for transmitting PRSs can be selected according to a planned or pseudo-random reuse scheme. In addition, a transmit diversity scheme can be applied to the PRSs to minimize impact of introducing the PRSs to legacy devices. Moreover, portions of a subframe not designated for PRS transmission can be utilized for user plane data transmission.
摘要翻译： 描述了有助于提供用于传输参考信号（诸如定位参考信号（PRS）和小区特定参考信号（CRS））的高重用性的系统和方法，以改善诸如三边测量等应用的可听性。 特别地，PRS可以在指定或选定的定位子帧中传输。 可以选择定位子帧内的资源元素用于发送PRS，并且可以避免与指定的控制区域的冲突，用于发送小区特定参考信号的资源元素等。 用于传输PRS的资源元素可以根据计划或伪随机重用方案来选择。 此外，发射分集方案可以应用于PRS，以最小化将PRS引入传统设备的影响。 此外，未指定用于PRS传输的子帧的部分可以用于用户平面数据传输。
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