公开(公告)号：US09307472B2

公开(公告)日：2016-04-05

申请号：US13893157

申请日：2013-05-13

Applicant: Apple Inc.

Inventor： Nimal Senarath ,  Bill Gage ,  Shalini Periyalwar ,  Wen Tong

IPC: H04W4/00 ,  H04W36/24 ,  H04W36/18

CPC classification number: H04W36/18 ,  H04L5/0048 ,  H04W36/0072 ,  H04W36/20 ,  H04W36/24 ,  H04W72/0446 ,  H04W80/02

Abstract: The present invention provides a method and system for facilitating efficient handoff and data throughput in mobile broadband communication systems. Methods implemented by a system constructed in accordance with the principles of the present invention include selectively enabled soft handoff, performing Layer 2 bearer functions at the base station and using the mobile device to coordinate soft handoff and interference avoidance without the need for a centralized coordination function.

公开(公告)号：US20160081104A1

公开(公告)日：2016-03-17

申请号：US14944370

申请日：2015-11-18

Applicant: Apple Inc.

Inventor： Jianming Wu ,  Wen Tong ,  Peiying Zhu

IPC: H04W72/12 ,  H04L5/00

CPC classification number: H04W72/12 ,  H04L1/0009 ,  H04L1/08 ,  H04L1/1867 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/006 ,  H04L5/0064 ,  H04W28/26 ,  H04W72/085 ,  H04W72/1263

Abstract: The present invention provides a technique for scheduling data, and in particular, scheduling real-time or voice data for transmissions during a transmit time interval in a multi-carrier communication environment. For each transmit time interval, channel condition indicia for multiple users is determined, and an iterative scheduling process is then implemented based in part on the channel condition indicia. The iterative scheduling initially pre-assigns select tones for each of the remaining users that have not been permanently assigned tones for the given transmit time interval. Next, the remaining user having the least favorable channel conditions is selected as an active user. The newly selected active user is then permanently assigned the select tones that were initially pre-assigned to that particular user. The permanently assigned tones are removed from consideration, and the process is repeated until all the remaining users are permanently assigned unique tones for scheduling.

Abstract translation: 本发明提供了一种用于调度数据的技术，特别是在多载波通信环境中的传输时间间隔期间调度实时或话音数据以进行传输。 对于每个发送时间间隔，确定多个用户的信道条件标记，并且部分地基于信道条件标记来实现迭代调度过程。 迭代调度最初为给定发送时间间隔未被永久分配的音调的每个剩余用户预先分配选择音调。 接下来，选择具有最不利条件的剩余用户作为活动用户。 然后，将新选择的活动用户永久分配给最初预分配给该特定用户的选择音。 从考虑中删除永久分配的音调，并重复该过程，直到所有剩余用户被永久分配唯一的音调进行调度。

公开(公告)号：US09277570B2

公开(公告)日：2016-03-01

申请号：US13666426

申请日：2012-11-01

Applicant: Apple Inc.

Inventor： Hang Zhang ,  Mo-Han Fong ,  Peiying Zhu ,  Wen Tong

IPC: H04W72/00 ,  H04W74/08 ,  H04W68/00

CPC classification number: H04W72/0413 ,  H04W68/00 ,  H04W74/0866

Abstract: A mobile terminal in a wireless communication network may be one of several modes of operation. When in an idle mode, the mobile terminal may avoid a lengthy random access procedure normally associated with responding to a page from a base station, if the base station includes in the page an indication of a resource that the mobile terminal may utilize when responding to the page. Additionally, the mobile terminal may transmit an efficient location update MAC header to a base station, whether prompted to by a page from the base station or not. Furthermore, without leaving the idle mode or a sleep mode, the mobile terminal may exchange short data burst messages with a base station.

公开(公告)号：US09173114B2

公开(公告)日：2015-10-27

申请号：US13848317

申请日：2013-03-21

Applicant: Apple Inc.

Inventor： Jianming Wu ,  Wen Tong ,  Peiying Zhu

IPC: H04K1/10 ,  H04L27/28 ,  H04W24/02 ,  H04L1/20 ,  H04L5/02 ,  H04L27/26 ,  H04B17/309 ,  H04B17/382 ,  H04L1/00 ,  H04L1/06 ,  H04B17/26 ,  H04B17/336 ,  H04B17/345

CPC classification number: H04B17/336 ,  H04B17/26 ,  H04B17/309 ,  H04B17/345 ,  H04B17/382 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0026 ,  H04L1/0643 ,  H04L1/20 ,  H04L5/023 ,  H04L27/2647 ,  H04W24/02 ,  H04W24/08

Abstract: A new method of performing interference estimation to allow the data packets to be efficiently delivered in an OFDM system. The interference estimation is performed on average over each frame for each mobile station individually in both frequency and time domains. Based on the estimated interference, the CIR can be determined by the BTS based on channel response estimates made by the BTS, or by the MS based on channel response estimates made for the uplink assuming a symmetrical channel. Numerical results show that the CIR estimation error could be very small if a sub-channel is considered as the minimum transmission unit. In terms of the aggregate throughput, the interference estimation method can provide a significant gain.

Abstract translation: 一种执行干扰估计以允许在OFDM系统中有效地传送数据分组的新方法。 对于每个移动台，在频域和时域中分别对每个帧平均执行干扰估计。 基于估计的干扰，可以由BTS基于由BTS做出的信道响应估计来确定CIR，或者基于对假设对称信道的针对上行链路的信道响应估计由MS确定CIR。 数值结果表明，如果将子信道视为最小传输单元，则CIR估计误差可能非常小。 在总吞吐量方面，干扰估计方法可以提供显着的增益。

公开(公告)号：US09106288B2

公开(公告)日：2015-08-11

申请号：US14493591

申请日：2014-09-23

Applicant: Apple Inc.

Inventor： Jianglei Ma ,  Ming Jia ,  Hua Xu ,  Wen Tong ,  Peiying Zhu ,  Moussa Abdi

IPC: H04K1/10 ,  H04B7/04 ,  H04L5/00 ,  H04L27/26 ,  H04W72/04 ,  H04W88/08 ,  H04J13/18 ,  H04L1/06 ,  H04L25/02 ,  H04J13/16

CPC classification number: H04B7/0452 ,  H04B7/0413 ,  H04J13/18 ,  H04J2013/165 ,  H04L1/0625 ,  H04L5/001 ,  H04L5/0026 ,  H04L5/0032 ,  H04L5/0048 ,  H04L5/005 ,  H04L5/0051 ,  H04L25/0226 ,  H04L25/0228 ,  H04L27/2613 ,  H04W72/04 ,  H04W72/044 ,  H04W88/08

Abstract: The present invention employs a pilot scheme for frequency division multiple access (FDM) communication systems, such as single carrier FDM communication systems. A given transmit time interval (TTI) may include numerous traffic symbols and one or more pilot symbols. A mobile terminal may generate, for a transmitter, sounding pilot information and map the sounding pilot information onto at least certain sub-carriers within a TTI. The one or more pilot symbols may include at least a first group of subcarriers and at least a second group of subcarriers. The first group of subcarriers may be sounding pilots and the second group of subcarriers may be pilots for demodulation. The second group may not include sounding pilots.

Abstract translation: 本发明采用诸如单载波FDM通信系统的频分多址（FDM）通信系统的导频方案。 给定的传输时间间隔（TTI）可以包括许多业务符号和一个或多个导频符号。 移动终端可以为发射机生成探测导频信息，并将探测导频信息映射到TTI内的至少某些子载波。 一个或多个导频符号可以包括至少第一组子载波和至少第二组副载波。 第一组子载波可以是探测导频，并且第二组子载波可以是用于解调的导频。 第二组可能不包括探空飞行员。

公开(公告)号：US09049620B2

公开(公告)日：2015-06-02

申请号：US14293170

申请日：2014-06-02

Applicant: Apple Inc.

Inventor： Hang Zhang ,  Mo-Han Fong ,  Peiying Zhu ,  Jianglei Ma ,  Wen Tong

IPC: H04W24/10 ,  H04B7/155 ,  H04W72/04 ,  H04W88/04 ,  H04W84/04

CPC classification number: H04W24/10 ,  H04B7/155 ,  H04W72/0406 ,  H04W84/047 ,  H04W88/04

Abstract: A method and system for wireless communication with a mobile device in which wireless communication is established with the mobile device. A base station is used to transmit directly to the mobile device in a downlink direction. A relay node is used to transmit to the base station communications received in an uplink direction from the mobile station. The relay node relays at least a portion of the uplink traffic received from the mobile station to the base station.

Abstract translation: 一种与移动设备进行无线通信的方法和系统，其中与移动设备建立无线通信。 基站用于在下行链路方向上直接发送到移动设备。 中继节点用于向基站发送从移动台沿上行方向接收的通信。 中继节点将从移动站接收的上行链路业务的至少一部分中继到基站。

公开(公告)号：US20150085821A1

公开(公告)日：2015-03-26

申请号：US14557319

申请日：2014-12-01

Applicant: Apple Inc.

Inventor： Jianglei Ma ,  Ming Jia ,  Wen Tong ,  Peiying Zhu ,  Hua Xu ,  Hang Zhang ,  Mo-Han Fong

IPC: H04L27/26 ,  H04W72/04 ,  H04L5/00 ,  H04J13/00 ,  H04B1/707 ,  H04B7/04

CPC classification number: H04J13/0003 ,  H04B1/707 ,  H04B7/0404 ,  H04B7/0678 ,  H04J13/00 ,  H04J13/16 ,  H04L5/0016 ,  H04L5/0026 ,  H04L5/0048 ,  H04L5/005 ,  H04L25/0204 ,  H04L25/0226 ,  H04L25/0232 ,  H04L25/03866 ,  H04L27/2613 ,  H04L27/2627 ,  H04W72/044

Abstract: In some embodiments of the invention, OFDM symbols are transmitted as a plurality of clusters. A cluster includes a plurality of OFDM sub-carriers in frequency, over a plurality of OFDM symbol durations in time. Each cluster includes data as well as pilot information as a reference signal for channel estimation. In some embodiments, a plurality of clusters collectively occupy the available sub-carrier set in the frequency domain that is used for transmission. In some embodiments of the invention data and/or pilots are spread within each cluster using code division multiplexing (CDM). In some embodiments pilots and data are separated by distributing data on a particular number of the plurality of OFDM symbol durations and pilots on a remainder of the OFDM symbol durations. CDM spreading can be performed in time and/or frequency directions.

Abstract translation: 在本发明的一些实施例中，OFDM符号作为多个簇发送。 在多个OFDM符号持续时间内，群集包括频率上的多个OFDM子载波。 每个簇包括数据以及作为信道估计的参考信号的导频信息。 在一些实施例中，多个集群共同地占用用于传输的频域中的可用子载波集合。 在本发明的一些实施例中，使用码分多路复用（CDM）在每个簇内扩展数据和/或导频。 在一些实施例中，通过在OFDM码元持续时间的其余部分上分配关于多个OFDM符号持续时间的特定数目和导频上的数据来分离导频和数据。 可以在时间和/或频率方向上执行CDM扩展。

公开(公告)号：US08947994B2

公开(公告)日：2015-02-03

申请号：US14251627

申请日：2014-04-13

Applicant: Apple Inc.

Inventor： Jianglei Ma ,  Wen Tong ,  Ming Jia ,  Hua Xu ,  Peiying Zhu ,  Hang Zhang

IPC: H04J9/00 ,  H04L27/26 ,  H04L5/00 ,  H04L1/00

CPC classification number: H04L27/263 ,  H04L1/0003 ,  H04L1/0009 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/0096 ,  H04L27/2613 ,  H04L27/2628 ,  H04L27/2634 ,  H04L27/2646

Abstract: Methods and systems are provided that enable an OFDM transmitter to be used for transmitting conventional OFDM or a form of transformed OFDM. A technique is provided for transforming a coded and modulated sequence of samples prior to an IFFT that enables the transformed sequence of samples to be transmitted using conventional OFDM or transformed OFDM. The selection of a transform function for transforming the coded and modulated sequence of samples may be based on optimizing the transform function for particular operating conditions between the transmitter and receiver. In some embodiments of the invention OFDM and time transformed OFDM are multiplexed in time and/or frequency in a transmission frame. In some embodiments of the invention a pilot pattern is provided in which the pilot are sent using OFDM and data is sent using OFDM and/or transformed OFDM.

Abstract translation: 提供了使OFDM发射机能够用于传输常规OFDM或变换OFDM形式的方法和系统。 提供了一种用于在IFFT之前变换样本的编码和调制序列的技术，其使得能够使用常规OFDM或变换OFDM来发送变换的样本序列。 用于变换样本的编码和调制序列的变换函数的选择可以基于优化发射机和接收机之间的特定操作条件的变换函数。 在本发明的一些实施例中，OFDM和时变OFDM在传输帧中以时间和/或频率被复用。 在本发明的一些实施例中，提供了导频模式，其中使用OFDM发送导频，并且使用OFDM和/或经变换的OFDM发送数据。

公开(公告)号：US08842756B2

公开(公告)日：2014-09-23

申请号：US13665982

申请日：2012-11-01

Applicant: Apple Inc.

Inventor： Jianglei Ma ,  Ming Jia ,  Hua Xu ,  Wen Tong ,  Peiying Zhu ,  Dong-Sheng Yu ,  Hang Zhang

IPC: H04K1/10

CPC classification number: H04L27/2611 ,  H04B7/06 ,  H04B7/08 ,  H04L5/0007 ,  H04L5/0023 ,  H04L25/0226 ,  H04L25/0232 ,  H04L27/2626 ,  H04L27/2647

Abstract: A method and apparatus for improving channel estimation within an OFDM communication system. Channel estimation in OFDM is usually performed with the aid of pilot symbols. The pilot symbols are typically spaced in time and frequency. The set of frequencies and times at which pilot symbols are inserted is referred to as a pilot pattern. In some cases, the pilot pattern is a diagonal-shaped lattice, either regular or irregular. The method first interpolates in the direction of larger coherence (time or frequency). Using these measurements, the density of pilot symbols in the direction of faster change will be increased thereby improving channel estimation without increasing overhead. As such, the results of the first interpolating step can then be used to assist the interpolation in the dimension of smaller coherence (time or frequency).

Abstract translation: 一种用于改善OFDM通信系统内的信道估计的方法和装置。 OFDM中的信道估计通常借助于导频符号来执行。 导频符号通常在时间和频率上间隔开。 将导频符号插入的频率和时间的集合称为导频模式。 在一些情况下，导频图案是对角线形格子，规则的或不规则的。 该方法首先在较大相干性（时间或频率）的方向内插。 使用这些测量，导频符号在更快变化方向上的密度将增加，从而改善信道估计而不增加开销。 因此，第一内插步骤的结果然后可以用于辅助尺寸较小的相干性（时间或频率）的内插。

公开(公告)号：US20140269489A1

公开(公告)日：2014-09-18

申请号：US14293170

申请日：2014-06-02

Applicant: Apple Inc.

Inventor： Hang Zhang ,  Mo-Han Fong ,  Peiying Zhu ,  Jianglei Ma ,  Wen Tong

IPC: H04W24/10 ,  H04W88/04

CPC classification number: H04W24/10 ,  H04B7/155 ,  H04W72/0406 ,  H04W84/047 ,  H04W88/04

Abstract: A method and system for wireless communication with a mobile device in which wireless communication is established with the mobile device. A base station is used to transmit directly to the mobile device in a downlink direction. A relay node is used to transmit to the base station communications received in an uplink direction from the mobile station. The relay node relays at least a portion of the uplink traffic received from the mobile station to the base station.

Abstract translation: 一种与移动设备进行无线通信的方法和系统，其中与移动设备建立无线通信。 基站用于在下行链路方向上直接发送到移动设备。 中继节点用于向基站发送从移动台沿上行方向接收的通信。 中继节点将从移动站接收的上行链路业务的至少一部分中继到基站。