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公开(公告)号：US20170353921A1
公开(公告)日：2017-12-07
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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公开(公告)号：US20170311318A1
公开(公告)日：2017-10-26
申请号：US15498363
申请日：2017-04-26
Applicant: Apple Inc.
Inventor： Guoqing LI , Yong LIU , Christiaan A. HARTMAN , Ashok RANGANATH , Oren SHANI , Su Khiong YONG , Jarkko L. KNECKT , Joonsuk KIM
CPC classification number: H04L5/0007 , H04L27/2602 , H04L47/14 , H04W74/06 , H04W84/12
Abstract: During operation, an interface circuit in an electronic device may receive, from a second electronic device (such as an access point in a WLAN), an uplink trigger frame that may specify an access category. In response to the uplink trigger frame, the electronic device may first include data associated with the specified access category in one or more frames, and then may transmit the one or more frames to the second electronic device. Moreover, when all the data associated with the specified access category has been transmitted or when there is no data associated with the specified access category, and when there is leftover time in an allocation associated with the uplink trigger frame, the interface circuit may transmit the one or more frames to the second electronic device with additional data associated with another access category that is different from the specified access category.
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公开(公告)号：US20170237532A1
公开(公告)日：2017-08-17
申请号：US15432758
申请日：2017-02-14
Applicant: Apple Inc.
Inventor： Guoqing LI , Oren SHANI , Matthew L. SEMERSKY , Ashok RANGANATH , Jarkko L. KNECKT , Christiaan A. HARTMAN , Yong LIU , Su Khiong YONG , Joonsuk KIM
IPC: H04L5/00 , H04W72/12 , H04L29/08 , H04L27/26 , H04B7/0452
Abstract: An electronic device communicates frames with an access point (AP) by receiving, from the AP, a frame header that includes information specifying a first set of tones of an OFDMA communication, the first set of tones associated with first resource block subchannels having a first bandwidth used by the AP to transmit a frame payload. The electronic device obtains a second set of tones associated with second resource block subchannels having a second bandwidth that differs from the first bandwidth, and receives the frame payload using the OFDMA communication, the second resource block subchannels, and the second set of tones. Alternatively, an electronic device dynamically switches a channel-access mode when communicating a frame with the AP depending on whether the communication includes a primary 20 MHz channel. In a technique, an MU-PPDU is communicated using a frame via a non-primary 20 MHz channel without using the primary 20 MHz channel.
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公开(公告)号：US20170070418A1
公开(公告)日：2017-03-09
申请号：US15256013
申请日：2016-09-02
Applicant: Apple Inc.
Inventor： Guoqing LI , Yong LIU , Joonsuk KIM , Christiaan A. HARTMAN , Su Khiong YONG , Syed A. MUJTABA , Matthew L. SEMERSKY
IPC: H04L12/761 , H04L29/06
CPC classification number: H04L45/16 , H04L12/189 , H04L61/2069 , H04W4/06 , H04W76/40
Abstract: Disclosed herein are system, method, and computer program product embodiments for selectively decoding a multicast subframe in a multi-user frame for a wireless communications protocol. Embodiments include transmitting a request frame including a multicast group address for a multicast group to an access point (AP). The AP can determine a multicast identifier for the multicast group based on the multicast group address in the request frame. The AP can also transmit a response frame including the determined multicast identifier to a station (STA). The STA can receive a multi-user frame containing a multicast subframe from the AP. The STA can determine whether the multicast subframe is destined for the STA based on the determined multicast identifier and a multicast identifier stored in a preamble of the multi-user frame. The STA can determine whether to decode the multicast subframe based on the determination of whether the multicast subframe is destined for the STA.
Abstract translation: 这里公开了用于在无线通信协议的多用户帧中选择性地解码多播子帧的系统，方法和计算机程序产品实施例。 实施例包括向接入点（AP）发送包括组播组的组播组地址的请求帧。 AP可以根据请求帧中的组播组地址确定组播组的组播标识符。 AP还可以将包括确定的多播标识符的响应帧发送到站（STA）。 STA可以从AP接收包含多播子帧的多用户帧。 STA可以基于所确定的多播标识符和存储在多用户帧的前同步码中的多播标识符来确定多播子帧是否发往STA。 基于确定多播子帧是否发往STA，STA可以确定是否对多播子帧进行解码。
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公开(公告)号：US20200008141A1
公开(公告)日：2020-01-02
申请号：US16286156
申请日：2019-02-26
Applicant: Apple Inc.
Inventor： Guoqing LI , Dagbegnon H. BAHINI , Rajneesh KUMAR
Abstract: Some embodiments include an apparatus and method for a mobile access point (AP) station that operates in an always-on soft AP mode where a station is associated with the mobile AP station, and switch back to operate as a station in an infrastructure mode with an AP. For example, in an always-on soft AP mode, the mobile AP station may implement a target wake time (TWT) responder power save mode feature. The mobile AP station may maintain a wake window after a beacon to enable unassociated devices to associate; establish a broadcast TWT schedule for unassociated TWT-capable devices to associate; schedule TWT for associated devices; go to sleep outside of the scheduled TWT of the associated devices; and switch back to infrastructure mode to perform as a station and maintain a connection with an AP.
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Patent Agency Ranking
公开(公告)号：US20190239250A1
公开(公告)日：2019-08-01
申请号：US16383155
申请日：2019-04-12
Applicant: Apple Inc.
Inventor： Guoqing LI , Joonsuk Kim , Christiaan A. Hartman , Syed Aon Mujtaba , Chiu Ngok E. Wong , Yong Liu , Su Khiong Yong
CPC classification number: H04W74/006 , H04L5/0007 , H04W74/0833 , H04W74/085 , Y02D70/00 , Y02D70/142
Abstract: Some embodiments are directed to grouping electronic devices into contention groups to reduce uplink Orthogonal Frequency-Division Multiple Access (OFDMA) random access (OFDMA-RA) collisions. An access point may explicitly assign an electronic device to a contention group, or the electronic device may implicitly determine an assignment to the contention group. To explicitly assign a device to a contention group, the access point may randomly assign or assign based on a criteria of the electronic device. Examples of criteria include an association identifier (AID), a traffic type/quality of service (QoS) category, a power saving preference, and an association status. The electronic device may implicitly determine a contention group assignment based on the total number of contention groups. The electronic device may use the explicitly or implicitly assigned contention group number to determine whether the electronic device may contend for a given trigger frame random access (TF-R) frame.
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公开(公告)号：US20180027485A1
公开(公告)日：2018-01-25
申请号：US15653825
申请日：2017-07-19
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 , H04W4/00 , H04W8/00 , H04B17/318
CPC classification number: H04W48/14 , H04B7/00 , H04B17/318 , H04W4/00 , H04W4/80 , H04W8/005 , 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：US20170347372A1
公开(公告)日：2017-11-30
申请号：US15610046
申请日：2017-05-31
Applicant: Apple Inc.
Inventor： Guoqing LI , Yoel BOGER , Christiaan A. HARTMAN , Yong LIU , Oren SHANI , Maksim SHMUKLER
CPC classification number: H04L49/90 , H04L5/0058 , H04W28/0278 , H04W72/1284 , H04W74/006 , H04W84/12
Abstract: An access point may receive, from a set of electronic devices, one or more buffer status reports that indicate that at least a subset of the electronic devices have uplink data associated with one or more access categories. In response, the access point may create a group of uplink virtual queues for one or more electronic devices in the subset based on the one or more buffer status reports, where a given uplink virtual queue corresponds to a particular access category and a given electronic device. The access point may start one or more backoff counters with a one-to-one correspondence to uplink virtual queues in the group of uplink virtual queues. When a backoff counter for the given uplink virtual queue reaches zero, the access point may transmit a trigger frame to an electronic device in the subset that corresponds to the given uplink virtual queue.
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公开(公告)号：US20170202015A1
公开(公告)日：2017-07-13
申请号：US15403092
申请日：2017-01-10
Applicant: Apple Inc.
Inventor： Guoqing LI , Christiaan A. HARTMAN , Ashok RANGANATH , Joonsuk KIM , Matthew L. SEMERSKY , Oren SHANI , Su Khiong YONG , Yong LIU
CPC classification number: H04W74/02 , H04W74/006 , H04W84/12
Abstract: An access point selects a channel access policy for an electronic device in a wireless local area network (WLAN). During operation, an interface circuit of the access point receives a channel access preference from the electronic device. The channel access preference includes: a multi-user trigger-based channel access technique, a single-user contention-based channel access technique, or both. The interface circuit selects the channel access policy for the electronic device based, at least in part, on the received channel access preference. The channel access policy can also be selected based at least in part on a communication performance metric associated with communication in the WLAN. The interface circuit communicates the selected channel access policy to the electronic device, which subsequently accesses a communication channel and communicates packets with the access point in accordance with the channel access policy.
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公开(公告)号：US20170093600A1
公开(公告)日：2017-03-30
申请号：US15279260
申请日：2016-09-28
Applicant: Apple Inc.
Inventor： Guoqing LI , Joonsuk KIM , Yong LIU , Christiaan A. HARTMAN , Su Khiong YONG
CPC classification number: H04L25/0224 , H04L5/0037 , H04L5/0048 , H04W84/12
Abstract: Time, frequency and waveform division multiplex schemes are used to efficiently estimate multiple uplink channels in a Wireless Local Area Network (WLAN). Orthogonal Frequency Division Multiple Access (OFDMA) and multi-user Multiple Input Multiple Output (MU-MIMO) approaches provide efficient uplink data transmission. An Access Point (AP) communicates with multiple Stations (STAs) in the WLAN. In some approaches, two or more STAs are addressed and the two or more STAs respond at the same time. The AP receives a composite signal and separates the responses to estimate the uplink channel from each STA. After the AP learns the uplink channels, the AP triggers data transmission from one or more of the WLAN STAs by sending a synchronizing trigger message. In some embodiments, the STAs respond simultaneously with data transmissions to the AP.
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