公开(公告)号：US10110361B2

公开(公告)日：2018-10-23

申请号：US15123247

申请日：2015-03-04

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

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

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

摘要： 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：US20160174253A1

公开(公告)日：2016-06-16

申请号：US14903596

申请日：2014-07-13

申请人： Jianhan LIU ,  James June-Ming WANG ,  Thomas Edward PARE, JR. ,  Yung-Ping HSU ,  MEDIATEK SINGAPORE PTE. LTD.

发明人： Jianhan Liu ,  James June-Ming Wang ,  Thomas Edward Pare, JR. ,  Yung-Ping Hsu

IPC分类号： H04W74/00 ,  H04W24/08

CPC分类号： H04W74/002 ,  H04W24/02 ,  H04W24/08 ,  H04W48/08 ,  H04W74/006 ,  H04W84/12

摘要： A method to improve the area throughput of dense wireless local area networks (WLAN) by channel access control is proposed. The method allows an access point to obtain information of a plurality of stations within the wireless network. The access point classifies the plurality of stations into at least one group of stations and assigns a group identification (ID) according to the obtained information. The group ID and channel access control parameters are sent to the stations that are classified into the certain group. The stations in each of the group use the received channel access control parameters to communicate with the access point.

摘要翻译： 提出了一种通过信道访问控制来提高密集无线局域网（WLAN）面积吞吐量的方法。 该方法允许接入点获得无线网络内的多个站的信息。 接入点将多个站分类为至少一组站，并根据获得的信息分配组标识（ID）。 组ID和通道访问控制参数被发送到分类到特定组的站。 每个组中的站使用接收到的信道访问控制参数与接入点进行通信。

公开(公告)号：US20130058239A1

公开(公告)日：2013-03-07

申请号：US13635360

申请日：2011-10-20

申请人： James June-Ming Wang ,  Jianhan Liu ,  Vishakan Ponnampalam ,  Chao-Chun Wang ,  Huanchun Ye

发明人： James June-Ming Wang ,  Jianhan Liu ,  Vishakan Ponnampalam ,  Chao-Chun Wang ,  Huanchun Ye

IPC分类号： H04W24/00

CPC分类号： H04B7/0452 ,  H04B7/0417 ,  H04B7/0617 ,  H04B7/063 ,  H04B7/0632 ,  H04B7/065 ,  H04B7/0658 ,  H04L1/0026 ,  H04L1/0028 ,  H04L25/0226 ,  H04L25/0228

摘要： A method of sounding and feedback with channel quality information and reduced overhead is provided. A receiving station receives a sounding signal transmitted from an access point over multiple sub-channels of a wide channel in a wireless network. The receiving station detects channel quality based on the received sounding signal for each sub-channel. The receiving station then performs channel estimation based on the received sounding signal and thereby determining feedback information. Finally, the receiving station transmits a feedback message to the access point, the feedback message contains NULL feedback information, reduced feedback information, or channel integrity/quality indicators based on the channel quality information for each sub-channel. Based on the feedback message, the access point may repeat the sounding process, narrow the transmission bandwidth, or select only stations who have indicated uncorrupted channel sounding for MU-MMO transmission.

摘要翻译： 提供了一种利用信道质量信息和降低开销的声音和反馈方法。 接收站通过无线网络中的宽信道的多个子信道接收从接入点发送的探测信号。 接收站基于接收到的每个子信道的探测信号来检测信道质量。 然后，接收站基于接收的探测信号进行信道估计，从​​而确定反馈信息。 最后，接收站向接入点发送反馈消息，反馈消息基于每个子信道的信道质量信息包含NULL反馈信息，减少的反馈信息或信道完整性/质量指示符。 基于反馈消息，接入点可以重复发声过程，缩小传输带宽，或仅选择指示MU-MMO传输不通道信道探测的台。

公开(公告)号：US20120263055A1

公开(公告)日：2012-10-18

申请号：US13417235

申请日：2012-03-10

申请人： Jianhan Liu ,  James Wang ,  Huanchun Ye ,  YungPing Hsu

发明人： Jianhan Liu ,  James Wang ,  Huanchun Ye ,  YungPing Hsu

IPC分类号： H04W52/10 ,  H04W52/02 ,  H04W24/10

CPC分类号： H04W52/0212 ,  H04L1/0025 ,  H04L1/0036 ,  H04W24/10 ,  H04W52/0229 ,  H04W52/0245 ,  H04W52/262 ,  H04W84/12 ,  Y02D70/144

摘要： An open-loop fast link adaptation scheme is proposed in an OFDM system. An access point first transmits a downlink packet comprising an open-loop link metric to a wireless station. The open-loop link metric contains a transmit power of the downlink packet plus a receiver sensitivity of the access point. The wireless station measures a received signal strength indication (RSSI) value of the downlink packet. The wireless station then applies open-loop link adaptation and determines a modulation and coding scheme (MCS) based on the open-loop link metric and the RSSI value. The open-loop link adaptation scheme is especially suitable for smart meter/sensor networks as it reduces overhead and increases link capacity.

摘要翻译： 在OFDM系统中提出了开环快速链路自适应方案。 接入点首先将包括开环链路度量的下行链路分组发送到无线站。 开环链路度量包含下行链路分组的发射功率加上接入点的接收机灵敏度。 无线站测量下行链路分组的接收信号强度指示（RSSI）值。 然后，无线站应用开环链路自适应，并且基于开环链路度量和RSSI值来确定调制和编码方案（MCS）。 开环链路自适应方案特别适用于智能电表/传感器网络，因为它减少了开销并增加了链路容量。