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    HE SIG B common field formats and indication
    2.
    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
    4.
    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.

    BACKWARD COMPATIBLE FRAME REUSE BY USING PREDETERMINED MASKING SEQUENCE
    5.
    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.

    Mechanism for short guard interval indication in high efficiency WLAN
    8.
    发明授权
    Mechanism for short guard interval indication in high efficiency WLAN 有权

    公开(公告)号：US10979178B2

    公开(公告)日：2021-04-13

    申请号：US15794981

    申请日：2017-10-26

    Applicant: MEDIATEK INC.

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

    IPC: H04L1/06 ,  H04L5/00 ,  H04L27/26 ,  H04L1/00 ,  H04W84/12

    Abstract: Systems and methods of expanding indication capabilities of existent PPDU preamble fields. The “GI+LTF Size” field is redefined to indicate a new combination of GI duration and HE-LTF size. The redefinition is indicated when the values of the two other existent fields, in combination, indicate an invalid scenario because the two values should have been mutually exclusive. Particularly, the DCM field and the STBC field are both set to the “enabled” mode as an indication for redefine the “GI+LTF Size” field. Upon receiving such a PPDU, a receiver is configured to resolve the PPDU as neither DCM nor STBC is enabled. Rather, the receiver interprets the particular combination of DCM and STBC values as an indication that the “GI+LTF Size” field is redefined to indicate the new combination of GI duration and HE-LTF size.

    Backward compatible frame reuse by using predetermined masking sequence
    9.
    发明授权
    Backward compatible frame reuse by using predetermined masking sequence 有权

    公开(公告)号：US10820207B2

    公开(公告)日：2020-10-27

    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: H04W40/00 ,  H04W16/02 ,  H04W16/14 ,  H04W28/02 ,  H04J3/16 ,  H04W74/00 ,  H04L1/00

    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.

    Dual-use of doppler mode indication in high efficiency wireless LAN
    10.
    发明授权
    Dual-use of doppler mode indication in high efficiency wireless LAN 有权

    公开(公告)号：US10594525B2

    公开(公告)日：2020-03-17

    申请号：US15928479

    申请日：2018-03-22

    Applicant: MEDIATEK INC.

    Inventor： Jianhan Liu ,  Tianyu Wu

    IPC: H04L27/26 ,  H04L25/02 ,  H04W84/12

    Abstract: Systems and methods of expanding indication capabilities of existent PPDU preamble fields. An existing field “Doppler mode” in a preamble is redefined into a dual-use field for indicating channel variation for a short packet as well as for indicating presence of mid-amble(s) in a long packet. Particularly, for a long packet (longer than a predefined data transmission time or a longer than a predefined number of data symbols), the two possible values of the one-bit “Doppler mode” field indicate whether there is any mid-amble carrying training symbols in the payload. On the other hand, for a short packet, the two possible values in the same field indicate whether the channel for transmitting the instant packet is currently time-variant as determined by the transmitting device.

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