公开(公告)号：WO2006009711A2

公开(公告)日：2006-01-26

申请号：PCT/US2005/021051

申请日：2005-06-14

Applicant: QUALCOMM Incorporated ,  KHANDEKAR, Aamod ,  AGRAWAL, Avneesh

Inventor： KHANDEKAR, Aamod ,  AGRAWAL, Avneesh

IPC: H04L27/00

CPC classification number: H04L5/0048 ,  H04B1/7077 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04L5/0026 ,  H04L25/0204 ,  H04L25/03866 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2662 ,  H04L27/2675

Abstract: Each base station transmits a TDM pilot 1 having multiple instances of a pilot-1 sequence generated with a PN1 sequence and a TDM pilot 2 having at least one instance of a pilot-2 sequence generated with a PN2 sequence. Each base station is assigned a specific PN2 sequence that uniquely identifies that base station. A terminal uses TDM pilot 1 to detect for the presence of a signal and uses TDM pilot 2 to identify base stations and obtain accurate timing. For signal detection, the terminal performs delayed correlation on received samples and determines whether a signal is present. If a signal is detected, the terminal performs direct correlation on the received samples with PN1 sequences for K 1 different time offsets and identifies K 2 strongest TDM pilot 1 instances. For time synchronization, the terminal performs direct correlation on the received samples with PN2 sequences to detect for TDM pilot 2.

Abstract translation: 每个基站发送具有由PN1序列生成的导频1序列的多个实例的TDM导频1和具有由PN2序列生成的导频-2序列的至少一个实例的TDM导频2。 为每个基站分配唯一标识该基站的特定PN2序列。 终端使用TDM导频1检测信号的存在，并使用TDM导频2识别基站并获得准确的定时。 对于信号检测，终端在接收到的采样上执行延迟相关，并确定信号是否存在。 如果检测到信号，则终端对于接收到的样本与用于不同时间偏移的PN1序列执行直接相关，并识别最强的TDM导频1实例。 对于时间同步，终端对PN2序列的接收样本执行直接相关，以检测TDM导频2。

公开(公告)号：WO2005125262A1

公开(公告)日：2005-12-29

申请号：PCT/US2005/019167

申请日：2005-05-31

Applicant: QUALCOMM Incorporated ,  JI, Tingfang ,  AGRAWAL, Avneesh

Inventor： JI, Tingfang ,  AGRAWAL, Avneesh

IPC: H04Q7/38

CPC classification number: H04W72/082 ,  H04L5/023 ,  H04W16/24 ,  H04W72/085

Abstract: 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 γ, 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.

Abstract translation: 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γ的高干扰，则终端被分配来自公共集的系统资源，该公共集合观察到来自扇区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：WO2005122628A1

公开(公告)日：2005-12-22

申请号：PCT/US2005/020180

申请日：2005-06-08

Applicant: QUALCOMM INCORPORATED ,  AGRAWAL, Avneesh ,  TEAGUE, Edward, Harrison ,  JI, Tingfang

Inventor： AGRAWAL, Avneesh ,  TEAGUE, Edward, Harrison ,  JI, Tingfang

IPC: H04Q7/38

CPC classification number: H04W36/18 ,  H04W36/06

Abstract: 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.

Abstract translation: 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。 服务扇区向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。 终端将分配的子带上的数据符号发送到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：WO2005122425A2

公开(公告)日：2005-12-22

申请号：PCT/US2005/019544

申请日：2005-06-03

Applicant: QUALCOMM Incorporated ,  AGRAWAL, Avneesh ,  MALLADI, Durga P. ,  STAMOULIS, Anastasios ,  MANTRAVADI, Ashok ,  MURALI, Ramaswamy

Inventor： AGRAWAL, Avneesh ,  MALLADI, Durga P. ,  STAMOULIS, Anastasios ,  MANTRAVADI, Ashok ,  MURALI, Ramaswamy

IPC: H04B7/00

CPC classification number: H04W88/10 ,  H04B7/2656 ,  H04L1/0083 ,  H04L5/14 ,  H04L27/2602 ,  H04W92/10 ,  Y02D70/1222 ,  Y02D70/1242 ,  Y02D70/1244 ,  Y02D70/21 ,  Y02D70/449

Abstract: Frame structures and transmission techniques for a wireless communication system are described. In one frame structure, a super-frame includes multiple outer-frames, and each outer-frame includes multiple frames, and each frame includes multiple time slots. The time slots in each super-frame are allocated for downlink and uplink and for different radio technologies (e.g., W-CDMA and OFDM) based on loading. Each physical channel is allocated at least one time slot in at least one frame of each outer-frame in the super-frame. An OFDM waveform is generated for each downlink OFDM slot and multiplexed onto the slot. A W-CDMA waveform is generated for each downlink W-CDMA slot and multiplexed onto the slot. A modulated signal is generated for the multiplexed W-CDMA and OFDM waveforms and transmitted on the downlink. Each physical channel is transmitted in bursts. The slot allocation and coding and modulation for each physical channel can change for each super-frame.

Abstract translation: 描述了用于无线通信系统的帧结构和传输技术。 在一帧结构中，超帧包括多个外帧，并且每个外帧包括多个帧，并且每个帧包括多个时隙。 每个超帧中的时隙基于加载被分配用于下行链路和上行链路以及不同的无线电技术（例如，W-CDMA和OFDM）。 每个物理信道在超帧中的每个外帧的至少一个帧中分配至少一个时隙。 为每个下行OFDM时隙生成OFDM波形并复用到时隙上。 为每个下行链路W-CDMA时隙产生W-CDMA波形并复用到该时隙上。 为多路复用的W-CDMA和OFDM波形生成调制信号并在下行链路上发送。 每个物理信道以突发方式传输。 每个物理信道的时隙分配和编码和调制可以针对每个超帧而改变。

公开(公告)号：WO2005076558A1

公开(公告)日：2005-08-18

申请号：PCT/US2004/040959

申请日：2004-12-07

Applicant: QUALCOMM INCORPORATED ,  GORE, Dhananjay, Ashok ,  AGRAWAL, Avneesh

Inventor： GORE, Dhananjay, Ashok ,  AGRAWAL, Avneesh

IPC: H04L27/26

CPC classification number: H04L25/0226 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0202 ,  H04L25/0212 ,  H04L27/2607 ,  H04L27/2647

Abstract: Pilot transmission and channel estimation techniques for an OFDM system with excess delay spread are described. To mitigate the deleterious effects of excess delay spread, the number of pilot subbands is greater than the cyclic prefix length. This "oversampling" may be achieved by using more pilot subbands in each symbol period or different sets of pilot subbands in different symbol periods. In one channel estimation technique, first and second groups of received pilot symbols are obtained for first and second pilot subband sets, respectively, and used to derive first and second frequency response estimates, respectively. First and second impulse response estimates are derived based on the first and second frequency response estimates, respectively, and used to derive a third impulse response estimate having more taps than the number of pilot subbands in either set.

Abstract translation: 描述了具有超延迟扩展的OFDM系统的导频传输和信道估计技术。 为了减轻多余的延迟扩展的有害影响，导频子带的数量大于循环前缀长度。 这种“过采样”可以通过在每个符号周期中使用更多的导频子带或在不同的符号周期内使用不同的导频子带集来实现。 在一个信道估计技术中，分别为第一和第二导频子带集获得第一组和第二组接收导频符号，并分别用于导出第一和第二频率响应估计。 基于第一和第二频率响应估计分别导出第一和第二脉冲响应估计，并且用于导出具有比两组中的导频子带数更多的抽头的第三脉冲响应估计。

公开(公告)号：WO2012174152A2

公开(公告)日：2012-12-20

申请号：PCT/US2012/042304

申请日：2012-06-13

Applicant: QUALCOMM INCORPORATED ,  ABRAHAM, Santosh, Paul ,  SAMPATH, Hemanth ,  JONES, IV, Vincent, Knowles ,  AGRAWAL, Avneesh ,  LI, Junyi

Inventor： ABRAHAM, Santosh, Paul ,  SAMPATH, Hemanth ,  JONES, IV, Vincent, Knowles ,  AGRAWAL, Avneesh ,  LI, Junyi

IPC: H04W8/00

CPC classification number: H04W84/12 ,  H04W8/005 ,  H04W76/14 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/164 ,  Y02D70/21 ,  Y02D70/22

Abstract: Certain aspects of the present disclosure generally provide methods and apparatus for enhanced discovery procedures in peer-to-peer (P2P) wireless local area networks (WLANs). With these procedures, discovery duration may be decreased, battery power consumption may be reduced during discovery, provided services may be ascertained during the device discovery phase without performing a separate service discovery phase, and/or the discovery range may be extended in an effort to discover a greater number of devices.

Abstract translation: 本公开的某些方面通常提供用于在对等（P2P）无线局域网（WLAN）中增强发现过程的方法和装置。 通过这些程序，可以减少发现持续时间，在发现期间可以减少电池功率消耗，只要可以在设备发现阶段确定服务，而不执行单独的服务发现阶段，和/或发现范围可以扩展到 发现更多的设备。

公开(公告)号：WO2010141911A3

公开(公告)日：2010-12-09

申请号：PCT/US2010/037533

申请日：2010-06-04

Applicant: QUALCOMM Incorporated ,  GOROKHOV, Alexei Y. ,  AGRAWAL, Avneesh

Inventor： GOROKHOV, Alexei Y. ,  AGRAWAL, Avneesh

IPC: H04B1/707

Abstract: Techniques for mitigating interference in a wireless communication system are described. In an aspect, pertinent transmission parameters for a served UE may be sent to at least one interfered UE to support interference mitigation. In one design, information for at least one transmission parameter for a data transmission sent by a first cell (110) to a first UE (120) may be transmitted to at least one UE (122) served by a second cell (112) to enable the at least one UE to perform interference mitigation for the data transmission sent by the first cell to the first UE. The information may be transmitted by either the first cell or the second cell. In another aspect, a cell may send transmission parameters for a UE via a pilot. In yet another aspect, scrambling may be performed by a cell at symbol level to enable an interfered UE to distinguish between modulation symbols of desired and interfering transmissions.

公开(公告)号：WO2010062606A1

公开(公告)日：2010-06-03

申请号：PCT/US2009/062233

申请日：2009-10-27

Applicant: QUALCOMM INCORPORATED ,  FISCHER, Sven ,  AMIN, Muhammad Awais ,  ROWITCH, Douglas Neal ,  AGRAWAL, Avneesh ,  BACHU, Raja S. ,  SAMPATH, Ashwin

Inventor： FISCHER, Sven ,  AMIN, Muhammad Awais ,  ROWITCH, Douglas Neal ,  AGRAWAL, Avneesh ,  BACHU, Raja S. ,  SAMPATH, Ashwin

IPC: G01S5/10 ,  G01S5/14 ,  G01S5/02

CPC classification number: G01S5/14 ,  G01S5/021 ,  G01S5/0221 ,  G01S5/0226 ,  G01S5/0236

Abstract: Techniques for determining time of arrivals (TOAs) of signals in a wireless communication network are described. Each cell may transmit (i) synchronization signals on a set of contiguous subcarriers in the center portion of the system bandwidth and (ii) reference signals on different sets of non-contiguous subcarriers distributed across the system bandwidth. A UE may determine TOA for a cell based on multiple signals transmitted on different sets of subcarriers. The UE may perform correlation for a first signal (e.g., a synchronization signal) from the cell to obtain first correlation results for different time offsets. The UE may perform correlation for a second signal (e.g., a reference signal) from the cell to obtain second correlation results for different time offsets. The UE may combine the first and second correlation results and may determine the TOA for the cell based on the combined correlation results.

Abstract translation: 描述了用于确定无线通信网络中的信号的到达时间（TOAs）的技术。 每个小区可以在系统带宽的中心部分中的一组连续子载波上发送（i）同步信号，以及（ii）分布在系统带宽上的不连续子载波的不同集合上的参考信号。 UE可以基于在不同的子载波集合上发送的多个信号来确定小区的TOA。 UE可以对来自小区的第一信号（例如，同步信号）执行相关性，以获得用于不同时间偏移的第一相关结果。 UE可以对来自小区的第二信号（例如，参考信号）执行相关性，以获得用于不同时间偏移的第二相关结果。 UE可以组合第一和第二相关结果，并且可以基于组合的相关结果来确定小区的TOA。

公开(公告)号：WO2009102906A1

公开(公告)日：2009-08-20

申请号：PCT/US2009/033978

申请日：2009-02-12

Applicant: QUALCOMM Incorporated ,  HORN, Gavin B. ,  AGRAWAL, Avneesh ,  SAMPATH, Ashwin ,  GOROKHOV, Alexei Y. ,  BHUSHAN, Naga

Inventor： HORN, Gavin B. ,  AGRAWAL, Avneesh ,  SAMPATH, Ashwin ,  GOROKHOV, Alexei Y. ,  BHUSHAN, Naga

IPC: H04W72/02 ,  H04W84/18 ,  H04W40/22

CPC classification number: H04W72/1263 ,  H04W72/00 ,  H04W72/04 ,  H04W72/0486 ,  H04W84/047 ,  H04W84/18 ,  H04W88/04

Abstract: Systems and methodologies are described that facilitate scheduling over multiple hops in a wireless communication network. Radio resources can be partitioned into sets of sub-frames that can be allocated statically and/or dynamically. Statically allocated radio resources can be reassigned over time based on the loading on each hop and/or throughput imbalance. In addition, dynamic assignment of sub-frames to each hop can be based on traffic or channel conditions. Moreover, the radio resources can be dynamically allocated in a distributed scheme, wherein a base station controls the scheduling of resources, or a centralized scheme, wherein a relay station controls the scheduling of resources. Furthermore the allocation of radio resources can be transparent or explicit. In the transparent case, the access terminal listens directly to the base station, and the relay station does not transmit control information, such as DL or UL assignments. Conversely, when the allocation of resources is explicit the relay station does transmit control information.

Abstract translation: 描述了有助于在无线通信网络中的多跳上进行调度的系统和方法。 无线电资源可以被划分成静态和/或动态分配的子帧集合。 基于每跳和/或吞吐量不平衡的负载，可以随时间重新分配静态分配的无线电资源。 此外，每个跳跃的子帧的动态分配可以基于业务或信道条件。 此外，无线电资源可以以分布式方案动态分配，其中基站控制资源的调度或集中式方案，其中中继站控制资源的调度。 此外，无线电资源的分配可以是透明或明确的。 在透明情况下，接入终端直接监听基站，中继站不发送DL或UL分配等控制信息。 相反，当资源分配明确时，中继站确实发送控制信息。

公开(公告)号：WO2009099471A2

公开(公告)日：2009-08-13

申请号：PCT/US2008/083043

申请日：2008-11-10

Applicant: QUALCOMM Incorporated ,  KHANDEKAR, Aamod ,  AGRAWAL, Avneesh ,  SAMPATH, Ashwin ,  HORN, Gavin B. ,  GOROKHOV, Alexei ,  BHUSHAN, Naga ,  JI, Tingfang

Inventor： KHANDEKAR, Aamod ,  AGRAWAL, Avneesh ,  SAMPATH, Ashwin ,  HORN, Gavin B. ,  GOROKHOV, Alexei ,  BHUSHAN, Naga ,  JI, Tingfang

IPC: H04W52/04

CPC classification number: H04W72/082 ,  H04W52/243 ,  H04W72/0426 ,  H04W84/045 ,  H04W92/20 ,  Y02D70/00

Abstract: 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.

Abstract translation: 本文描述了在无线接入网络（AN）的无线接入点（AP）之间利用回程信令来提供减少干扰和/或避免的干扰。 作为示例，AP可以发出干扰避免请求（IAR），以减少相邻AP在前向链路（FL）和/或下行链路（DL）传输上的信号干扰。 IAR可以经由回程网络和/或通过与AP或一个或多个干扰AP耦合的接入终端（AT）进行路由。 在接收到IAR时，干扰AP可以确定用于FL和/或RL传输的降低的发射功率电平并响应于IAR。 响应可以包括降低的功率级别，并且可以通过回程网络或OTA发送。 通过全面或部分采用回程网络，即使对于通过回程耦合的半计划或计划外异构网络，也可以进行干扰回避。