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公开(公告)号：US09532243B2
公开(公告)日：2016-12-27
申请号：US14502790
申请日：2014-09-30
Applicant: Apple Inc.
Inventor： Joonsuk Kim , Yong Liu , Harish Ramamurthy
CPC classification number: H04W24/02 , H04L5/001 , H04L27/0006 , H04L27/2614 , H04W16/14 , H04W74/0808
Abstract: A wireless local area network (WLAN) device processes received samples for a radio frequency channel in an unlicensed radio frequency band to detect radio frequency interference from a long term evolution (LTE) wireless communication system. The WLAN device performs a correlation of received time-domain samples to detect the presence of a cyclic prefix for an orthogonal frequency division multiplexing (OFDM) symbol used by the LTE wireless communication system. The WLAN device searches for cross-correlation peaks (1) that exceed a peak power threshold value, (2) that a ratio of which exceed a ratio threshold, and (3) that are separated by a time period corresponding to the OFDM symbol. The WLAN device detects the presence of the LTE wireless communication system without decoding the OFDM symbols.
Abstract translation: 无线局域网（WLAN）设备处理非许可射频频带中的射频信道的接收样本，以检测来自长期演进（LTE）无线通信系统的射频干扰。 WLAN设备执行接收的时域采样的相关性，以检测LTE无线通信系统使用的正交频分复用（OFDM）符号的循环前缀的存在。 WLAN设备搜索超过峰值功率阈值的互相关峰值（1），（2）其比率超过比率阈值，和（3）被与OFDM符号相对应的时间间隔分隔开。 WLAN设备在不解码OFDM符号的情况下检测LTE无线通信系统的存在。
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公开(公告)号：US12207352B2
公开(公告)日：2025-01-21
申请号：US18532877
申请日：2023-12-07
Applicant: Apple Inc.
Inventor： Chiu Ngok E. Wong , Christiaan A. Hartman , Zheng Zeng , Joonsuk Kim , Su Khiong Yong , Yong Liu
Abstract: Embodiments described herein relate to a system and method for providing flexible receiver configuration in wireless communication systems, such as 802.11 WLAN systems. In one embodiment, a wireless device may transmit a first data frame including first configuration information specifying a first configuration of the receiver to notify a remote device that the wireless device intends to configure its receiver according to the first configuration. After receiving an acknowledgement frame confirming the first configuration information, the wireless device may configure the receiver according to the first configuration. In another embodiment, a wireless device may receive a first data frame including first configuration information and further including a request that the wireless device configure its receiver according to the first configuration. In response, the wireless device may configure the receiver according to the first configuration. In either case, the wireless device may receive subsequent communications according to the first configuration.
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公开(公告)号：US20220123895A1
公开(公告)日：2022-04-21
申请号：US17566005
申请日：2021-12-30
Applicant: Apple Inc.
Inventor： Joonsuk Kim , Yuchul Kim
Abstract: This disclosure relates to orthogonal frequency division multiple access (OFDMA) communication in wireless local area networks (WLANs). According to some embodiments, a downlink OFDMA frame may be transmitted. An uplink OFDMA frame including acknowledgements associated with the downlink OFDMA frame may be received. The uplink OFDMA frame may be processed, in some instances including determining which devices receiving the downlink OFDMA frame transmitted an acknowledgement associated with the downlink OFDMA frame in the uplink OFDMA frame.
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公开(公告)号：US11032757B2
公开(公告)日：2021-06-08
申请号：US16798835
申请日：2020-02-24
Applicant: Apple Inc.
Inventor： Jarkko L. Kneckt , Christiaan A. Hartman , Guoqing Li , Joonsuk Kim , Matthew L. Semersky , Oren Shani , Syed A. Mujtaba , Yong Liu
IPC: H04W48/14 , H04B17/318 , H04W8/00 , H04W4/80 , H04B7/00 , H04W4/00 , H04W24/00 , H04W68/00 , H04W84/12
Abstract: Passive and active scanning for extended range wireless networking. The choice between legacy and extended range signaling can depend on one or more factors. For passive scanning, an electronic device may transmit a combination of legacy beacons and extended range beacons for network discovery by receiving electronic devices. For active scanning, an electronic device may transmit extended range probe requests in addition to legacy probe requests to discover all of the access points within its transmission range. Responses to probe requests can use extended range, legacy, single user, and/or multi user protocols.
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公开(公告)号：US10785718B2
公开(公告)日：2020-09-22
申请号：US15615218
申请日：2017-06-06
Applicant: Apple Inc.
Inventor： Guoqing Li , Oren Shani , Yong Liu , Christiaan A. Hartman , Jarkko L. Kneckt , Joonsuk Kim , Su Khiong Yong
IPC: H04W52/02
Abstract: An access point establishes target wakeup times (TWTs) with one or more associated electronic devices in a WLAN. The access point transitions to a power-saving mode outside of the one or more TWTs. The access point maintains synchronization with the one or more electronic devices, during at least a first TWT in the one or more TWTs, by transmitting, to the one or more electronic devices, a TWT beacon that includes, or in conjunction with, synchronization information. Alternatively or additionally, during at least the first TWT, the access point transmits a multi-user trigger frame that includes the synchronization information to the one or more electronic devices. In response to the multi-user trigger frame, the access point receives data frames from the one or more electronic devices, transmits one or more acknowledgments, and transitions into the power-saving mode during a remainder of at least the first TWT.
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Patent Agency Ranking
公开(公告)号：US10742368B2
公开(公告)日：2020-08-11
申请号：US16378718
申请日：2019-04-09
Applicant: Apple Inc.
Inventor： Joonsuk Kim , Guoqing Li
IPC: H04L5/00 , H04L1/00 , H04W28/20 , H04W4/08 , H04W72/04 , H04W88/02 , H04W88/08 , H04W80/00 , H04W84/12
Abstract: A wireless access point transmits a protocol data unit (PDU) that includes data and signaling for a plurality of user devices. The PDU spans a channel in frequency and an interval in time, and includes a first signaling section, a second signaling section and a traffic action. For each of a plurality of subchannels of the channel: the first signaling section includes (within the subchannel) a corresponding redundant copy of common signaling information for the user devices associated with the access point; the second signaling section includes (within the subchannel) a corresponding set of user-specific signaling information for a corresponding group of one or more of the user devices; and the traffic section includes (within the subchannel) a corresponding set of traffic data for the corresponding group of one or more user devices. Subchannels sizes may be configurable. A signaling set CRC may be included per subchannel.
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公开(公告)号：US10715288B2
公开(公告)日：2020-07-14
申请号：US15590960
申请日：2017-05-09
Applicant: Apple Inc.
Inventor： Oren Shani , Guoqing Li , Joonsuk Kim , Ashok Ranganath
Abstract: An access point (AP) in a wireless local area network (WLAN) uses a protocol to determine frequency/time resource allocations of resource units (RUs) in parallel with data transfer to and from WLAN stations (STAs). The AP generates a sounding table associating STAs with RUs for uplink (UL) and downlink (DL). The AP processes the sounding table to create a channel map table and then the AP allocates particular RUs to particular STAs. The STAs then receive and transmit data from and to the AP over the allocated RUs. This approach achieves good throughput while reducing the use of signaling and pilot overhead associated with channel sounding. To avoid interruption of ongoing transmissions, a newly arriving STA is grouped and sounded with other STAs. The protocol includes a joint sounding and data epoch followed by a determination of the channel map table.
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公开(公告)号：US10476639B2
公开(公告)日：2019-11-12
申请号：US15146087
申请日：2016-05-04
Applicant: Apple Inc.
Inventor： Joonsuk Kim , Guoqing Li , Syed Aon Mujtaba
Abstract: Disclosed herein are system, method, and computer program product embodiments for providing an efficient way to assign resource blocks to user receiver devices in a wireless communications protocol. For example, the method can receive a frame for a wireless communications protocol. The method can also extract a unique value from a tone mapping field in a preamble of the frame. The method can also look up a resource block allocation for a portion of the tone space in a lookup table using the unique value. Further, the method can extract an assignment field from the preamble based on the determined resource block allocation. The method can also determine an assigned resource block number based on the assignment field. The method can also assign a resource block corresponding to the assigned resource block number to a user receiver device.
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公开(公告)号：US10237870B2
公开(公告)日：2019-03-19
申请号：US15147443
申请日：2016-05-05
Applicant: Apple Inc.
Inventor： Guoqing Li , Joonsuk Kim , Christiaan A. Hartman , Yong Liu , Chiu Ngok E. Wong , Syed Aon Mujtaba , Su Khiong Yong
IPC: H04W72/04 , H04L5/00 , H04B7/0452 , H04L1/18 , H04W84/12
Abstract: Managing orthogonal frequency division multiple access (OFDMA) uplink acknowledgements is described herein. An example system can include an interface circuit to generate a physical layer convergence protocol data unit (PPDU) including a physical layer preamble, a first sub-channel field corresponding to a first station, and a second sub-channel field corresponding to a second station. The first sub-channel field can carry a first unicast trigger corresponding to the first station, and the second sub-channel field can carry a second unicast trigger corresponding to the second station. The interface circuit can also transmit the PPDU to the first and second stations.
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公开(公告)号：US10219224B2
公开(公告)日：2019-02-26
申请号：US16028659
申请日：2018-07-06
Applicant: Apple Inc.
Inventor： Chiu Ngok E. Wong , Christiaan A. Hartman , Joonsuk Kim , Syed Aon Mujtaba , Yong Liu , Su Khiong Yong
IPC: H04W52/02 , H04L29/06 , H04L1/00 , H04W40/24 , H04W40/00 , H04L12/931 , H04W88/02 , H04W84/12 , H04L29/08
Abstract: Embodiments described herein relate to providing reduced power consumption in wireless communication systems, such as 802.11 WLAN systems. Timing information regarding power save opportunities (PSOPs) may be provided in communication frames, which may inform mobile devices of expected frame exchange periods during which they may transition to a Doze state. Additional PSOP information may be included in beacon frames, which may inform mobile devices of expected multicast periods during which they may transition to a Doze state. This may operate to provide improvements in terms of power consumption.
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