公开(公告)号：US20130223563A1

公开(公告)日：2013-08-29

申请号：US13847167

申请日：2013-03-19

Applicant: Apple Inc.

Inventor： Shiquan Wu ,  Wen Tong ,  Claude Royer ,  Peiying Zhu

IPC: H04L27/26

CPC classification number: H04L27/265 ,  H04J11/0023 ,  H04L27/2605 ,  H04L27/2626 ,  H04L27/2691 ,  H04L27/2695

Abstract: Systems and methods for transmitting and receiving OFDM symbols are provided which enable the otherwise wasted transmission time normally used as a prefix for each OFDM symbol to contain useful information. At the receiver, the received signal is processed to convert received OFDM symbols from a linear convolution with the channel to a cyclic convolution.

Abstract translation: 提供用于发送和接收OFDM符号的系统和方法，其使得能够将通常用作每个OFDM符号的前缀的否则浪费的传输时间包含有用信息。 在接收机处理接收到的信号以将接收到的OFDM符号从与该信道的线性卷积转换为循环卷积。

公开(公告)号：US20130064154A1

公开(公告)日：2013-03-14

申请号：US13666426

申请日：2012-11-01

Applicant: Apple Inc.

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

IPC: H04W52/02 ,  H04W72/04

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.

Abstract translation: 无线通信网络中的移动终端可以是若干操作模式之一。 当处于空闲模式时，如果基站在页面中包括移动终端在响应时可以利用的资源的指示，则移动终端可以避免通常与响应于来自基站的页面相关联的冗长的随机接入过程 这一页。 另外，移动终端可以向基站发送有效的位置更新MAC报头，无论是否由来自基站的页面提示。 此外，在不离开空闲模式或睡眠模式的情况下，移动终端可以与基站交换短数据突发消息。

公开(公告)号：US11888615B2

公开(公告)日：2024-01-30

申请号：US16397152

申请日：2019-04-29

Applicant: APPLE INC.

Inventor： Robert Novak ,  Hang Zhang ,  Sophie Vrzic ,  Mo-Han Fong ,  Kelvin Kar-Kin Au ,  Jianglei Ma ,  Peiying Zhu ,  Wen Tong

IPC: H04L1/00 ,  H04L5/00 ,  H04L1/14 ,  H04L1/1607 ,  H04L1/1867 ,  H04L65/80 ,  H04L65/70 ,  H04L65/1101

CPC classification number: H04L1/0067 ,  H04L1/0013 ,  H04L1/0025 ,  H04L1/14 ,  H04L1/1614 ,  H04L1/1867 ,  H04L5/0037 ,  H04L5/0042 ,  H04L5/0046 ,  H04L5/0064 ,  H04L65/1101 ,  H04L65/70 ,  H04L65/80 ,  H04L5/0007 ,  H04L2001/0093

Abstract: Methods and systems are provided for allocating resources including VoIP (voice over Internet Protocol) and Non-VoIP resources. In some embodiments, multiplexing schemes are provided for use with OFDMA (orthogonal frequency division multiplexing access) systems, for example for use in transmitting VoIP traffic. In some embodiments, various HARQ (Hybrid Automatic request) techniques are provided for use with OFDMA systems. In various embodiments, there are provided methods and systems for dealing with issues such as Handling non-full rate vocoder frames, VoIP packet jitter handling, VoIP capacity increasing schemes, persistent and non-persistent assignment of resources in OFDMA systems.

公开(公告)号：US11201648B2

公开(公告)日：2021-12-14

申请号：US16745516

申请日：2020-01-17

Applicant: Apple Inc.

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

IPC: H04B7/0456 ,  H04B7/06 ,  H04L5/00 ,  H04W48/08 ,  H04B7/0413 ,  H04W72/04 ,  H04W72/08 ,  H04W74/06 ,  H04L5/02 ,  H04L27/26

Abstract: Systems and methods for closed loop MIMO (multiple input and multiple output) wireless communication are provided. Various transmit formats including spatial multiplexing and STTD are defined in which vector or matrix weighting is employed using information fed back from receivers. The feedback information may include channel matrix or SVD-based feedback.

公开(公告)号：US10985892B2

公开(公告)日：2021-04-20

申请号：US16591711

申请日：2019-10-03

Applicant: Apple Inc.

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

IPC: H04L5/00 ,  H04L1/18 ,  H04L9/08 ,  H04L9/30 ,  H04L1/16 ,  H04L27/26 ,  H04W12/00 ,  H04W12/02 ,  H04L1/00 ,  H04L1/06 ,  H04W12/04

Abstract: Systems and methods are provided for enabling H-ARQ communication between a base station and one or more wireless terminals. Methods for enabling incremental redundancy (IR) based H-ARQ, Chase based H-ARQ and Space-Time Code combining (STC) based H-ARQ between devices for down⋅link and up-link direction transmissions are provided in the form of an information element (IE) for use with a Normal MAP convention as currently accepted in the draft version standard of IEEE 802.16. In addition, embodiments of the invention provide a resource management scheme to protect a network from abuse of resources from a wireless terminal not registered with the network. Components of the down-link and up-link mapping components of a data frame transmitted from the base station to one or more wireless terminals included messages that are readable by all wireless terminals as well as some messages that are encrypted and only readable by wireless terminals that are authenticated as being registered with the network.

公开(公告)号：US10965389B2

公开(公告)日：2021-03-30

申请号：US15869863

申请日：2018-01-12

Applicant: APPLE INC.

Inventor： Jianming Wu ,  Wen Tong ,  Peiying Zhu

IPC: H04B17/336 ,  H04B17/309 ,  H04B17/382 ,  H04L1/00 ,  H04L1/20 ,  H04L5/02 ,  H04L27/26 ,  H04W24/02 ,  H04W24/08 ,  H04B17/26 ,  H04B17/345 ,  H04L1/06

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.

公开(公告)号：US10700905B2

公开(公告)日：2020-06-30

申请号：US16666650

申请日：2019-10-29

Applicant: Apple Inc.

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

IPC: H04L27/26 ,  H04W52/32 ,  H04L25/02 ,  H04L5/00 ,  H04B7/08 ,  H04B7/06 ,  H04L1/06 ,  H04L1/00

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).

公开(公告)号：US10686512B2

公开(公告)日：2020-06-16

申请号：US15796071

申请日：2017-10-27

Applicant: APPLE INC.

Inventor： Jianglei Ma ,  Ming Jia ,  Jianming Wu ,  Peiying Zhu ,  Wen Tong ,  Evelyne Le Strat ,  Sarah Boumendil ,  Moussa Abdi

IPC: H04B7/06 ,  H04B7/0452

Abstract: Spatial multiplexing and transmit diversity can improve the capacity of a wireless communication system. The system and method adapts communication schemes for communication systems with multiple antennas utilizing at least two transmission modes. The at least two transmission modes can, but are not necessarily, used for uplink communications. The two transmission modes may be chosen from the group consisting of a single antenna mode, a diversity mode a spatial multiplexed mode and a mixed diversity and spatial multiplexed mode. The at least two transmission modes may involve adaptation among multiple transmitters. At least one receiver may indicate a transmission mode to be used by a transmitter for a subsequent transmission. A transmitter may determine a transmission mode to be used for a subsequent transmission. The transmission mode can be based on channel sounding.

公开(公告)号：US20200177246A1

公开(公告)日：2020-06-04

申请号：US16786679

申请日：2020-02-10

Applicant: Apple Inc.

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

IPC: H04B7/0452 ,  H04W72/04 ,  H04J13/18 ,  H04L5/00 ,  H04W88/08 ,  H04B7/0413 ,  H04L27/26

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 will include numerous traffic symbols and two or more short pilot symbols, which are spaced apart from one another by at least one traffic symbol and will have a Fourier transform length that is less than the Fourier transform length of any given traffic symbol. Multiple transmitters will generate pilot information and modulate the pilot information onto sub-carriers of the short pilot symbols in an orthogonal manner. Each transmitter may use different sub-carriers within the time and frequency domain, which is encompassed by the short pilot symbols within the transmit time interval. Alternatively, each transmitter may uniquely encode the pilot information using a unique code division multiplexed code and modulate the encoded pilot information onto common sub-carriers of the short pilot symbols.

公开(公告)号：US20200162138A1

公开(公告)日：2020-05-21

申请号：US16749687

申请日：2020-01-22

Applicant: APPLE INC.

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

IPC: H04B7/0456 ,  H04B7/0413 ,  H04W74/06 ,  H04W72/08 ,  H04W72/04 ,  H04W48/08 ,  H04L5/02 ,  H04L5/00 ,  H04B7/06

Abstract: Aspects of the present invention provide additional MAC functionality to support the PHY features of a wireless communication system framework. The additional MAC functionality aids in enabling feedback from wireless terminals to base stations. In some aspects of the invention the feedback is provided on an allocated feedback channel. In other aspects of the invention the feedback is provided by MAC protocol data units (PDU) in a header, mini-header, or subheader. The feedback may be transmitted from the wireless terminal to the base station autonomously by the wireless terminal or in response to an indication from the base station that feedback is requested. Aspects of the invention also provide for allocating feedback resources to form a dedicated feedback channel. One or more of these enhancements is included in a given implementation. Base stations and wireless terminals are also described upon which methods described herein can be implemented.