公开(公告)号：US20180309605A1

公开(公告)日：2018-10-25

申请号：US15928479

申请日：2018-03-22

Applicant: MEDIATEK INC.

Inventor： Jianhan Liu ,  Tianyu Wu

IPC: H04L27/26

CPC classification number: H04L27/2602 ,  H04L25/0222 ,  H04L25/0224 ,  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.

公开(公告)号：US10110361B2

公开(公告)日：2018-10-23

申请号：US15123247

申请日：2015-03-04

Applicant: MEDIATEK INC. ,  Tianyu Wu ,  Jianhan Liu ,  Kiran Uln ,  Thomas Edward Pare, Jr.

Inventor： Tianyu Wu ,  Jianhan Liu ,  Kiran Uln ,  Thomas Edward Pare, Jr.

IPC: H04L5/00 ,  H04L25/02 ,  H04B17/24 ,  H04B17/336 ,  H04B7/0452 ,  H04B7/06 ,  H04L1/16 ,  H04B7/0417 ,  H04W72/04 ,  H04W72/08

Abstract: A method of sub-channel feedback in OFDMA systems is provided. A wireless receiving device (STA) receives a radio signal from a transmitting device (AP) over a wide channel in an OFDMA system. The radio signal is transmitted over multiple sub-channels of the wide channel. The STA estimates channel quality information based on the received radio signal for each sub-channel. The STA then sends feedback information to the transmitting device. The feedback information comprises the estimated channel quality information for a selected subset of sub-channels from the wide channel based on a predefined rule. In one embodiment, the feedback information is embedded within an ACK/BA frame or is carried in a frame immediately subsequent to the ACK/BA frame.

公开(公告)号：US20180295578A1

公开(公告)日：2018-10-11

申请号：US15928514

申请日：2018-03-22

Applicant: MEDIATEK INC.

Inventor： Jianhan Liu ,  Po-Yuen Cheng ,  Thomas Edward Pare, JR.

IPC: H04W52/02 ,  H04L27/04

Abstract: Systems and methods of transmitting and receiving a Wake-Up Radio (WUR) packet by using a simplified preamble structure that contains no training field. The preamble carries a signature sequence selected from a set of predefined sequences, each corresponding to a different data transmission rate. The preamble and the control information of the WUR packet are transmitted in the same rate as indicated by the selected sequence. Hence, a receiving WUR can determine the data transmission rate and locate the associated control information directly if a sequence that matches a predefined signature sequence is detected. The same sequence or in combination with an additional sequence in the preamble may also be used to indicate automatic gain control synchronization, packet type and other related information.

公开(公告)号：US10091822B2

公开(公告)日：2018-10-02

申请号：US14977632

申请日：2015-12-21

Applicant: MEDIATEK INC.

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

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

Abstract: 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

Applicant: MEDIATEK INC.

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

IPC: H04L27/26 ,  H04L1/00

CPC classification number: H04L27/2637 ,  H04L1/0071 ,  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.

公开(公告)号：US20170134207A1

公开(公告)日：2017-05-11

申请号：US15342299

申请日：2016-11-03

Applicant: MEDIATEK INC.

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

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

CPC classification number: 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

Abstract: 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：US20160261434A1

公开(公告)日：2016-09-08

申请号：US15060624

申请日：2016-03-04

Applicant: MEDIATEK INC.

Inventor： Chien-Fang Hsu ,  Jianhan Liu

IPC: H04L25/02

CPC classification number: H04L27/2666 ,  H04L27/0012 ,  H04L27/2613

Abstract: The present invention provides a method and an electronic apparatus for automatically detecting bandwidth and the packet type of a packet, so as to solve the problem mentioned above. The method comprises: detecting a plurality of symbols in the preamble of the packet; generating a sign pattern according to the symbols; and determining the bandwidth and the packet type of the packet according to the detected sign pattern. The electronic apparatus comprises: a symbol detecting circuit, a sign pattern generating circuit, and a determining circuit. The symbol detecting circuit is utilized for detecting a plurality of symbols in the preamble of the packet. The sign pattern generating circuit is utilized for generating a sign pattern according to the symbols. The determining circuit is utilized for determining the bandwidth and the packet type of the packet according to the detected sign pattern.

Abstract translation: 本发明提供了一种用于自动检测分组的带宽和分组类型的方法和电子装置，以解决上述问题。 该方法包括：检测分组的前同步码中的多个符号; 根据符号生成符号图案; 以及根据检测到的符号模式确定分组的带宽和分组类型。 该电子设备包括：符号检测电路，符号图案产生电路和确定电路。 符号检测电路用于检测分组的前导码中的多个符号。 符号图案生成电路用于根据符号生成符号图案。 确定电路用于根据检测到的符号模式来确定分组的带宽和分组类型。

公开(公告)号：US20160183305A1

公开(公告)日：2016-06-23

申请号：US14977632

申请日：2015-12-21

Applicant: MEDIATEK INC.

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

IPC: H04W74/08

CPC classification number: H04W74/0833 ,  H04W74/02

Abstract: 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.

Abstract translation: 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

Applicant: MEDIATEK INC.

Inventor： Tianyu Wu ,  Jianhan Liu ,  Thomas Edward Pare, JR.

IPC: H04L12/741 ,  H04L29/06

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

Abstract: 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.

Abstract translation: 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。