WIRELESS LOCAL AREA NETWORK SOUNDING PROTOCOL

    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.

    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.

    ACCESS-CATEGORY-BASED MULTI-USER TRIGGER FRAMES

    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.

    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.

    BUFFER STATUS REPORT FOR HIGH PRIORITY TRANSMISSION

    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.

    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.

    CHANNEL ACCESS POLICY CONTROL DURING WIRELESS COMMUNICATION

    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.

    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.

    ACCESS-CATEGORY-BASED MULTI-USER TRIGGER FRAMES

    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.

    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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