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    HE SIG B common field formats and indication
    41.
    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
    43.
    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
    44.
    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
    45.
    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
    46.
    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.

    Spatial Reuse Parameters for Opportunistic Adaptive TPC and CCA
    50.
    发明申请
    Spatial Reuse Parameters for Opportunistic Adaptive TPC and CCA 有权
    机会自适应TPC和CCA的空间重用参数

    公开(公告)号：US20170070962A1

    公开(公告)日：2017-03-09

    申请号：US15257074

    申请日：2016-09-06

    Applicant: MEDIATEK INC.

    Inventor： James June-Ming Wang ,  Jianhan Liu ,  Chao-Chun Wang ,  YungPing Hsu

    IPC: H04W52/24 ,  H04W16/02 ,  H04B17/345 ,  H04W74/08

    CPC classification number: H04W52/243 ,  H04B17/345 ,  H04W16/02 ,  H04W52/146 ,  H04W52/241 ,  H04W52/242 ,  H04W52/245 ,  H04W52/247 ,  H04W52/50 ,  H04W74/0816 ,  H04W84/12

    Abstract: A method of spatial reuse with opportunistic transmit power control (TPC) and clear channel assessment (CCA) is proposed. In the opportunistic TPC and CCA, a spatial reuse station (SR-STA) gains enough knowledge in certain situation for more aggressive spatial reuse such that its transmit power may be adjusted to meet the spatial reuse conditions based on the received OBSS PPDU and the corresponding spatial reuse parameter (SRP). Both Type 1 SRP and Type 2 SRP are defined. In one example, the Type 1 or Type 2 SRP is a 5-bit parameter carried in the HE-SIG-A field of the OBSS PPDU, which can be a trigger frame, a response frame, a request-to-send (RTS)/clear-to-send (CTS) frame, and a data frame.

    Abstract translation: 提出了一种利用机会性发射功率控制（TPC）和清晰信道评估（CCA）进行空间重用的方法。 在机会主义TPC和CCA中，空间重用站（SR-STA）在某些情况下获得足够的知识以进行更积极的空间重用，使得其发射功率可以被调整以满足基于接收到的OBSS PPDU和对应的空间重用条件 空间复用参数（SRP）。 定义了Type 1 SRP和Type 2 SRP。 在一个示例中，类型1或类型2 SRP是OBSS PPDU的HE-SIG-A字段中携带的5位参数，其可以是触发帧，响应帧，请求发送（RTS ）/清除发送（CTS）帧和数据帧。

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