公开(公告)号：US20170331605A1

公开(公告)日：2017-11-16

申请号：US15590960

申请日：2017-05-09

Applicant: Apple Inc.

Inventor： Oren SHANI ,  Guoqing LI ,  Joonsuk KIM ,  Ashok RANGANATH

IPC: H04L5/00 ,  H04W72/04 ,  H04W84/12

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.

公开(公告)号：US20190386793A1

公开(公告)日：2019-12-19

申请号：US16459544

申请日：2019-07-01

Applicant: Apple Inc.

Inventor： Guoqing LI ,  Yong LIU ,  Christiaan A. HARTMAN ,  Ashok RANGANATH ,  Oren SHANI ,  Su Khiong YONG ,  Jarkko L. KNECKT ,  Joonsuk KIM

IPC: H04L5/00 ,  H04W74/06 ,  H04L12/801

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.

公开(公告)号：US20170230860A1

公开(公告)日：2017-08-10

申请号：US15428959

申请日：2017-02-09

Applicant: Apple Inc.

Inventor： Guoqing LI ,  Christiaan A. HARTMAN ,  Oren SHANI ,  Matthew L. SEMERSKY ,  Joonsuk KIM ,  Jarkko KNECKT ,  Ashok RANGANATH ,  Yong LIU ,  Su Khiong YONG

IPC: H04W28/02 ,  H04L29/12

CPC classification number: H04W28/0278 ,  H04W84/12

Abstract: A wireless local area network (WLAN) station (STA) reports, with a medium access control (MAC) frame, a buffer status of an urgent traffic identifier (TID) to a second STA. In some embodiments, the second STA is also an access point (AP). The delay in reporting is reduced by providing a buffer status report for the urgent TID in a data frame being transmitted to carry data for a current TID. The buffer status report, in some embodiments, provides the value of the urgent TID. In some embodiments, the buffer status report provides an indication of the amount of data in a buffer corresponding to the urgent TID. In some embodiments, the buffer status report is based on an aggregated measure of more than one buffer with data awaiting transmission. The transmission of the MAC frame, in some embodiments, is unsolicited.

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

IPC: H04W74/02 ,  H04W74/00

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.

公开(公告)号：US20170347370A1

公开(公告)日：2017-11-30

申请号：US15605158

申请日：2017-05-25

Applicant: Apple Inc.

Inventor： Jarkko L. KNECKT ,  Ashok RANGANATH ,  Yong LIU ,  Christiaan A. HARTMAN ,  Guoqing LI ,  Oren SHANI ,  Joonsuk KIM

IPC: H04W74/00 ,  H04W74/08 ,  H04W84/12

CPC classification number: H04W74/006 ,  H04W84/12 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/14 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/166 ,  Y02D70/20 ,  Y02D70/22 ,  Y02D70/26

Abstract: An electronic device that transmits a frame to a second electronic device is described. In particular, during operation, an interface circuit in the electronic device (such as an access point in a WLAN) may transmit the frame to the second electronic device using a Wi-Fi communication protocol. The frame may include information cancelling a previously specified NAV protected time in a preamble of the frame. For example, the information may include a CF-End indication. Moreover, the information may be included in a MAC header of the frame and, more generally, in a preamble of a high efficiency (HE) physical layer convergence protocol (PLCP) protocol data unit (PPDU). Furthermore, the electronic device may transmit the frame in response to a block acknowledgment (BA) from the second electronic device.

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

IPC: H04W72/04 ,  H04L5/00 ,  H04W84/12 ,  H04W88/08

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.

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.