公开(公告)号：US10979178B2

公开(公告)日：2021-04-13

申请号：US15794981

申请日：2017-10-26

申请人： MEDIATEK INC.

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

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

摘要： 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.

公开(公告)号：US10820207B2

公开(公告)日：2020-10-27

申请号：US15590851

申请日：2017-05-09

申请人： MEDIATEK INC.

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

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

摘要： 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.

公开(公告)号：US10594525B2

公开(公告)日：2020-03-17

申请号：US15928479

申请日：2018-03-22

申请人： MEDIATEK INC.

发明人： Jianhan Liu ,  Tianyu Wu

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

摘要： 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.

公开(公告)号：US10594462B2

公开(公告)日：2020-03-17

申请号：US15278031

申请日：2016-09-28

申请人： MEDIATEK INC.

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

IPC分类号： H04L5/00 ,  H04W72/04

摘要： Methods and apparatus are provided for structured resource allocation signaling. In one novel aspect, an 8-bit RU allocation filed is allocated in the HE-SIG-B common field for each 20 MHz. The structured resource signaling supports more than four MU-MIMO users. In one embodiment, the STA decodes the 8-bit RU allocation signal following a structured resource unit (RU) allocation rule, and determines the RU. In one embodiment, the STA decodes the first two bits of the 8-bit RU allocation signal to determine a first category of the RU allocation. The categories of the RU allocation includes a large RU size category indicating larger than or equal to 20 MHz RUs exist, a two 106-tone category indicating two 106-tone RUs exist, and a no-large-RU category indicating only smaller-than-242-tone RUs exist. The STA further decodes based on the category. A lookup table (LUT) for RU allocation is built and decoded based on a structured signaling rule.

公开(公告)号：US20180309605A1

公开(公告)日：2018-10-25

申请号：US15928479

申请日：2018-03-22

申请人： MEDIATEK INC.

发明人： Jianhan Liu ,  Tianyu Wu

IPC分类号： H04L27/26

CPC分类号： H04L27/2602 ,  H04L25/0222 ,  H04L25/0224 ,  H04W84/12

摘要： 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.

公开(公告)号：US10091822B2

公开(公告)日：2018-10-02

申请号：US14977632

申请日：2015-12-21

申请人： MEDIATEK INC.

发明人： Rongsheng Huang ,  Tianyu Wu ,  Jianhan Liu ,  Chao-Chun Wang ,  Chih-Shi Yee

IPC分类号： H04W74/08 ,  H04W72/02 ,  H04W74/02

摘要： A method of improved allocation of uplink resources in an OFDMA network is proposed. A wireless communications station (an AP) reserves both dedicated resource and contention resource for uplink OFDMA operation for a list of communications devices (STAs). The AP can switch between random access operation and non-random access operation without the need for any special protection mechanisms. In the event of an increase in uplink OFDMA frame collisions the AP can switch from random operation to non-random operation to reduce the number of collisions. In the event of a decrease in uplink OFDMA frame collisions the AP can switch from non-random operation to random operation to reduce required AP processing. The AP can also dynamically control a STA access probability to reduce the number of collisions by reducing the number of uplink OFDMA frames each STA transmits.

公开(公告)号：US20170180177A1

公开(公告)日：2017-06-22

申请号：US15381109

申请日：2016-12-16

申请人： MEDIATEK INC.

发明人： Tianyu Wu ,  Jianhan Liu ,  Gary A. Anwyl ,  Thomas Edward PARE, JR.

IPC分类号： H04L27/26 ,  H04L1/00

CPC分类号： H04L27/2637 ,  H04L1/0071 ,  H04L1/04 ,  H04L1/08 ,  H04W84/12

摘要： 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.

公开(公告)号：US20170134207A1

公开(公告)日：2017-05-11

申请号：US15342299

申请日：2016-11-03

申请人： MEDIATEK INC.

发明人： Jianhan Liu ,  Chih-Kai Chen ,  Tianyu Wu ,  Thomas Edward PARE, JR.

IPC分类号： H04L27/26 ,  H04B17/318 ,  H04L25/03 ,  H04L5/00

CPC分类号： H04L27/2695 ,  H04B7/0626 ,  H04B7/0689 ,  H04B17/318 ,  H04L1/0026 ,  H04L5/0048 ,  H04L25/022 ,  H04L25/0222 ,  H04L25/023 ,  H04L25/03057 ,  H04L27/26 ,  H04L27/2602 ,  H04W84/12 ,  H04W88/08

摘要： Signaling and feedback schemes of channel variation information from WLAN receiver are proposed. WLAN receiver performs channel tracking and obtains channel variation information. The signaling and feedback of channel variation information can help WLAN transmitter to decide when to apply travelling pilots or mid-amble in the transmission. Furthermore, the channel variation information can assist WLAN transmitter for scheduling the next transmission properly and thereby enhancing the system performance of WLAN.

公开(公告)号：US20160183305A1

公开(公告)日：2016-06-23

申请号：US14977632

申请日：2015-12-21

申请人： MEDIATEK INC.

发明人： RONGSHENG HUANG ,  Tianyu Wu ,  Jianhan Liu ,  Chao-Chun Wang ,  Chih-Shi Yee

IPC分类号： H04W74/08

CPC分类号： H04W74/0833 ,  H04W74/02

摘要： A method of improved allocation of uplink resources in an OFDMA network is proposed. A wireless communications station (an AP) reserves both dedicated resource and contention resource for uplink OFDMA operation for a list of communications devices (STAs). The AP can switch between random access operation and non-random access operation without the need for any special protection mechanisms. In the event of an increase in uplink OFDMA frame collisions the AP can switch from random operation to non-random operation to reduce the number of collisions. In the event of a decrease in uplink OFDMA frame collisions the AP can switch from non-random operation to random operation to reduce required AP processing. The AP can also dynamically control a STA access probability to reduce the number of collisions by reducing the number of uplink OFDMA frames each STA transmits.

摘要翻译： 提出了一种改善OFDMA网络中上行链路资源分配的方法。 无线通信站（AP）为通信设备（STA）列表的上行链路OFDMA操作保留专用资源和争用资源。 AP可以在随机访问操作和非随机访问操作之间切换，而不需要任何特殊的保护机制。 在上行链路OFDMA帧冲突增加的情况下，AP可以从随机操作切换到非随机操作，以减少冲突次数。 在上行链路OFDMA帧冲突减少的情况下，AP可以从非随机操作切换到随机操作，以减少所需的AP处理。 AP还可以通过减少每个STA发送的上行链路OFDMA帧的数量来动态地控制STA接入概率以减少冲突的数量。

公开(公告)号：US20160065467A1

公开(公告)日：2016-03-03

申请号：US14837296

申请日：2015-08-27

申请人： MEDIATEK INC.

发明人： Tianyu Wu ,  Jianhan Liu ,  Thomas Edward Pare, JR.

IPC分类号： H04L12/741 ,  H04L29/06

CPC分类号： H04L65/60 ,  H04B7/0452 ,  H04B7/0689 ,  H04L1/0004 ,  H04L1/0009 ,  H04L5/0023 ,  H04L5/0046 ,  H04L5/0091 ,  H04L27/0008 ,  H04L27/2602

摘要： A method of providing a configurable signaling (SIG) field is proposed to reduce the SIG overhead of a data packet in a wireless network. The SIG field comprises both HE-SIG-A field and HE-SIG-A2 field. HE-SIG-A field contains only necessary information for a default network scenario (e.g., indoor non-OFDMA SU-MIMO) to avoid HE-SIG-A2. HE-SIG-A2 field contains OFDMA, MU-MIMO, and/or outdoor parameter settings. By using HE-SIG-A to indicate the existence, mode, and/or length of HE-SIG-A2, the signaling overhead for default scenario can be reduced by avoiding the entire HE-SIG-A2 field. The number of symbols required for HE-SIG-A2 is adjustable based on each transmission scenario and indicated by HE-SIG-A. Further, because higher MCS such as QPSK may be supported for HE-SIG-A2, additional signaling overhead is reduced.

摘要翻译： 提出了提供可配置信令（SIG）字段的方法，以减少无线网络中的数据分组的SIG开销。 SIG字段包括HE-SIG-A字段和HE-SIG-A2字段。 HE-SIG-A字段仅包含用于避免HE-SIG-A2的默认网络场景（例如，室内非OFDMA SU-MIMO）的必要信息。 HE-SIG-A2字段包含OFDMA，MU-MIMO和/或户外参数设置。 通过使用HE-SIG-A来表示HE-SIG-A2的存在，模式和/或长度，通过避免整个HE-SIG-A2字段，可以减少默认情况的信令开销。 HE-SIG-A2所需的符号数量可根据每种传输方案进行调整，并由HE-SIG-A指示。 此外，由于HE-SIG-A2可能支持诸如QPSK的更高的MCS，所以额外的信令开销降低。