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    HE SIG B common field formats and indication
    42.
    发明授权
    HE SIG B common field formats and indication 有权

    公开(公告)号：US10264580B2

    公开(公告)日：2019-04-16

    申请号：US15259008

    申请日：2016-09-07

    Applicant: MEDIATEK INC.

    Inventor： Tianyu Wu ,  Shengquan Hu ,  Jianhan Liu ,  Thomas Edward Pare, Jr.

    IPC: H04L5/00 ,  H04W72/04 ,  H04B7/0452

    Abstract: Methods and apparatus are provided for HE-SIG-B common field formats and indications. In one novel aspect, a fixed format is used for HE-SIG-B common field indicating resource allocations (RA). In one embodiment, look-up tables (LUT) are configured for the resource allocation and indicated in the HE-SIG-B common field. In one embodiment, one or more RA LUTs are used based on the operation bandwidth. The RA LUTs are placed in an order of channel indexes from lower channel to upper channel signaled in each corresponding RA LUT. In another novel aspect, MU-MIMO is used for operation bandwidth of 160 MHz and a compression indicator is set in the HE-SIG-A field indicating a saving of all RA LUTS in the HE-SIG-B common field. In yet another novel aspect, a one-bit middle-tone indicator is included in the HE-SIG-B common field indicating whether the one or more middle 26 tone is used.

    Interleaver design for dual sub-carrier modulation in WLAN
    44.
    发明授权
    Interleaver design for dual sub-carrier modulation in WLAN 有权

    公开(公告)号：US10200228B2

    公开(公告)日：2019-02-05

    申请号：US15381109

    申请日：2016-12-16

    Applicant: MEDIATEK INC.

    Inventor： Tianyu Wu ,  Jianhan Liu ,  Gary A. Anwyl ,  Thomas Edward Pare, Jr.

    IPC: H04L27/26 ,  H04L1/00 ,  H04L1/04 ,  H04L1/08 ,  H04W84/12

    Abstract: A method of interleaver design for dual carrier modulation (DCM) is proposed in a wireless network. For HE PPDU transmission with DCM, information bits are first encoded by a BCC encoder. The BCC encoded bit streams are then interleaved by a BCC interleaver. More specifically, the BCC interleaved bits are repeated on two halves of a given resource unit (RU). The BCC interleaver parameters are defined based on half of the total number of the data tones of the RU if DCM is applied. The BCC interleaved bits are then modulated and mapped to two halves of the RU by a DCM constellation mapper.

    Enhanced channel contention schemes for high-efficiency WLAN
    45.
    发明授权
    Enhanced channel contention schemes for high-efficiency WLAN 有权

    公开(公告)号：US10104664B2

    公开(公告)日：2018-10-16

    申请号：US15181354

    申请日：2016-06-13

    Applicant: MEDIATEK INC.

    Inventor： Jianhan Liu ,  RongSheng Huang ,  Li Ma ,  Chao-Chun Wang

    IPC: H04W72/04 ,  H04W74/08 ,  H04L5/00 ,  H04L27/26 ,  H04W16/14 ,  H04W84/12 ,  H04W88/02

    Abstract: A unified channel contention scheme is proposed such that spatial reuse can be enabled by a wireless station (STA) when a basic service set (BSS) color of a received signal cannot be resolved. If the detected frame is an intra-BSS frame, then the STA should not contend the channel for the PPDU duration. If the detected frame is an inter-BSS frame, then the STA uses OBSS Packet Detection (OBSS-PD) level as the CCA level for channel contention. Furthermore, when BSS color cannot be resolved, channel contention schemes for WiFi signal and non-WiFi signal are differentiated. If the received signal is detected as WiFi signal, then the STA uses WiFi-SIG Detection (WD) level as the CCA level for channel contention. If the received signal is detected as non-WiFi signal, then the STA uses Non-WiFi-SIG Detection (NWD) level as the CCA level for channel contention.

    BACKWARD COMPATIBLE FRAME REUSE BY USING PREDETERMINED MASKING SEQUENCE
    46.
    发明申请
    BACKWARD COMPATIBLE FRAME REUSE BY USING PREDETERMINED MASKING SEQUENCE 审中-公开

    公开(公告)号：US20170332241A1

    公开(公告)日：2017-11-16

    申请号：US15590851

    申请日：2017-05-09

    Applicant: MEDIATEK INC.

    Inventor： Jianhan Liu ,  Tianyu Wu ,  Rongsheng Huang ,  James June-Ming Wang

    IPC: H04W16/02 ,  H04J3/16 ,  H04W16/14 ,  H04W28/02

    Abstract: A backward compatible frame reuse mechanism that allows new information to be defined a reused frame without causing any incorrect operation in a legacy receive device. To generate a reused frame, a portion of the frame in the first format is masked with a predetermined masking sequence (PMS) and thereby redefined as new fields in a second format. When a device that supports the reuse scheme receives a frame that possible is a reused frame, the device checks the potentially reused portion according to the first format after de-masking and also checks according to the second format without de-masking. Based on the check results, the device selects a format to resolve the frame. A legacy device receiving the reused frame only checks the reused portion without de-masking, which results in a certain check error and makes the device discard the frame without any harmful operation.

    Burst OFDMA supporting MU-MIMO
    47.
    发明授权
    Burst OFDMA supporting MU-MIMO 有权

    公开(公告)号：US09780926B2

    公开(公告)日：2017-10-03

    申请号：US14833072

    申请日：2015-08-22

    Applicant: MEDIATEK INC.

    Inventor： Yuh-Ren Jauh ,  Jianhan Liu ,  Chao-Chun Wang ,  James June-Ming Wang ,  Thomas Edward Pare, Jr.

    IPC: H04W4/00 ,  H04L5/00 ,  H04B7/0452

    CPC classification number: H04L5/0007 ,  H04B7/0452 ,  H04L5/0055

    Abstract: Methods and apparatus are provided for burst OFDMA support MU-MIMO in the WLAN network. In one novel aspect, pluralities of user channels are configured for a downlink wideband channel, wherein each user channel is associated with a user group selecting from a SU-SISO, or a SU-MIMO or a MU-MIMO. In one embodiment, the SIG1 and SIG2 signaling fields are independent for each user channel. In another embodiment, the SIG1 fields are duplicates for all user channels carrying common information. The SIG2 fields for each user group are different from each other carrying user group specific information. In another novel aspect, an uplink OFDMA frames contains ACK packets from multiple STAs concurrently using an uplink wideband channel. In one embodiment, one ACK packet is sent for a MU-MIMO user group. In another embodiment, the uplink ACK packet assignment is based on indications in the downlink PHY SIG field.

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