公开(公告)号：EP2439869A2

公开(公告)日：2012-04-11

申请号：EP11184518.6

申请日：2011-10-10

申请人： FUJITSU LIMITED

发明人： Zhu, Chenxi

IPC分类号： H04L1/16

CPC分类号： H04L1/1607 ,  H04L1/0029 ,  H04L1/1861 ,  H04L5/0055

摘要： A first system receives N data transmissions from a second system. The first system combines N ACK/NACK responses, corresponding to the N data transmissions received, and encodes the combined N ACK/NACK responses by selecting a position of a communication channel over which the first system sends ACK/NACK transmissions to the second system and setting a value for each bit sent during each ACK/NACK transmission based on the combined N ACK/NACK responses. The first system sends the bits at the selected position of the communication channel. The second system, upon receiving the bits sent at the selected position of the communication channel, decodes the N ACK/NACK responses based on the position at which the bits are sent and the bits.

摘要翻译： 第一个系统从第二个系统接收N个数据传输。 第一系统组合对应于所接收的N个数据传输的N个ACK / NACK响应，并且通过选择第一系统向第二系统发送ACK / NACK传输的通信信道的位置来编码组合的N个ACK / NACK响应，以及 基于组合的N个ACK / NACK响应设置在每个ACK / NACK传输期间发送的每个比特的值。 第一个系统在通信信道的选定位置发送位。 第二系统在接收到在通信信道的选择位置处发送的比特时，基于发送比特的位置和比特来解码N个ACK / NACK响应。

公开(公告)号：EP1710960A3

公开(公告)日：2006-11-15

申请号：EP06007379.8

申请日：2006-04-07

申请人： FUJITSU LIMITED

发明人： Zhu, Chenxi ,  Nadeem, Tamer ,  Agre, Jonathan, R.

IPC分类号： H04L12/28

CPC分类号： H04W74/0808 ,  H04W16/28 ,  H04W84/12

摘要： Disclosed is a wireless station having a receiver and a network allocation vector associated with each of a plurality of directional antennas. The receivers concurrently listen for frames from remote stations. When any receiver detects a frame from a remote station, the receiver activates its associated NAV. The station has one or more transmitters that can transmit using the antennas. While transmitting a signal using an antenna, the receivers associated with any non-transmitting antennas continue to listen for signals from remote stations. The station cancels any signals from the transmitting antenna received by the non-transmitting antennas. To perform the cancellation, the station performs a self-calibration procedure. The station can self-calibrate by either silencing neighboring stations or by inserting null tones into a transmitted calibration signal.

公开(公告)号：EP2523363A3

公开(公告)日：2013-01-16

申请号：EP12167722.3

申请日：2012-05-11

申请人： FUJITSU LIMITED

发明人： Zhu, Chenxi

IPC分类号： H04B7/06 ,  H04B7/02 ,  H04L25/03

CPC分类号： H04B7/0639 ,  H04B7/024 ,  H04L5/0007 ,  H04L25/0224 ,  H04L25/03904 ,  H04L25/03955

摘要： A beamforming method including selecting a first transmission site from a plurality of transmission sites (108a, 108b, 108c) based on the quality of a first channel between the first transmission site and an endpoint or terminal (110). The method further includes determining a first precoding matrix corresponding to the first transmission site. The first precoding matrix may be applied to data transmitted by the first transmission site to the endpoint. The method further includes determining a second precoding matrix corresponding to a second transmission site of the plurality of transmission sites. The second precoding matrix may be determined based on at least a first spatial direction that is calculated based on at least the first channel.

公开(公告)号：EP2182761A1

公开(公告)日：2010-05-05

申请号：EP09174392.2

申请日：2009-10-28

申请人： FUJITSU LIMITED

发明人： Chen, Wei-Peng ,  Zhu, Chenxi ,  Okuda, Masato ,  Agre, Jonathan R.

IPC分类号： H04W52/02 ,  H04W88/08

CPC分类号： H04W52/0225 ,  H04W52/0206 ,  H04W88/08 ,  Y02D70/146 ,  Y02D70/22 ,  Y02D70/23

摘要： According to one embodiment, a method for wireless communication comprises providing, at a base station, a plurality of endpoints with access to a wireless network. The method also comprises the base station entering a low power mode, wherein the base station ceases to provide the plurality of endpoints with access to the wireless network while in the low power mode. In addition, the method comprises the base station transitioning to an active mode from the low power mode during a first predetermined time, wherein the first predetermined time is identified by the base station and at least one endpoint before the base station transitions to the active mode. Further, if the base station receives a request to access the wireless network from at least one endpoint after transitioning to the active mode during a second predetermined time, the method comprises the base station remaining in the active mode. If the base station does not receive a request to access the wireless network from at least one endpoint after transitioning to the active mode during the second predetermined time, the method comprises the base station transitioning to the low power mode.

公开(公告)号：EP2136587A2

公开(公告)日：2009-12-23

申请号：EP09171903.9

申请日：2007-07-31

申请人： FUJITSU LIMITED

发明人： Hart, Michael John Beems ,  Zhou, Yuefeng ,  Viorel, Dorin ,  Zhu, Chenxi ,  Nakamura, Michiharu ,  Watanabe, Masahiro ,  Fujita, Hiroshi ,  Yoshida, Makoto

IPC分类号： H04W28/16

CPC分类号： H04W28/16 ,  H04B7/15507 ,  H04B7/2606 ,  H04L5/0007 ,  H04L5/0032 ,  H04L5/0048 ,  H04L25/0226 ,  H04L27/2655 ,  H04L27/2692 ,  H04W48/08 ,  H04W84/047

摘要： A transmission method for use in a multi-hop wireless communication system, the system comprising a source apparatus, a destination apparatus and one or more intermediate apparatuses, said source apparatus being operable to transmit information along a series of links forming a communication path extending from the source apparatus to the destination apparatus via the or each intermediate apparatus, and the or each intermediate apparatus being operable to receive information from a previous apparatus along the path and to transmit the received information to a subsequent apparatus along the path, the system having access to at least one predetermined transmission introduction sequence and also having access to a time-frequency format for use in assigning available transmission frequency bandwidth during a discrete transmission interval, said format defining a plurality of transmission windows within such an interval, each window occupying a different part of that interval and having a frequency bandwidth profile within said available transmission frequency bandwidth over its part of that interval, each said window being assignable for such a transmission interval to at least one of said apparatuses for use in transmission, the method comprising: when transmitting a message with a preamble in a particular transmission interval, transmitting the preamble in a first transmission window of that transmission interval; and transmitting the or one of the transmission introduction sequences in a second transmission window of that transmission interval other than the first transmission window preferably as control information for use by at least one said intermediate apparatus or the destination apparatus.

摘要翻译： 一种在多跳无线通信系统中使用的传输方法，所述系统包括源设备，目的地设备和一个或多个中间设备，所述源设备可操作以沿着形成通信路径的一系列链路传输信息，所述通信路径从 所述源设备经由所述或每个中间设备到所述目的地设备，并且所述或每个中间设备可操作以沿着所述路径接收来自先前设备的信息并且将接收到的信息发送到沿着所述路径的后续设备，所述系统具有接入 到至少一个预定的传输引入序列，并且还可以访问时间频率格式以用于在离散传输间隔期间分配可用传输频率带宽，所述格式在这样的间隔内定义了多个传输窗口，每个窗口占用不同的 部分的时间间隔，并有一个 在所述可用传输频率带宽内的所述可用传输频率带宽内的所述可用传输频率带宽内，每个所述窗口可针对这样的传输间隔分配给所述用于传输的至少一个所述设备，所述方法包括：当将前导码 特定传输间隔，在该传输间隔的第一传输窗口中传输前导码; 以及在除了第一发送窗之外的发送间隔的第二发送窗口中发送发送导入序列或一个发送导入序列，优选地作为由至少一个所述中间装置或目的地装置使用的控制信息。

公开(公告)号：EP2028784A2

公开(公告)日：2009-02-25

申请号：EP08102266.7

申请日：2008-03-04

申请人： FUJITSU LIMITED

发明人： Viorel, Dorin ,  Chen, Wei-Peng ,  Agre, Jonathan ,  Zhu, Chenxi

IPC分类号： H04L5/00

CPC分类号： H04W4/08 ,  H04L5/0007 ,  H04L5/0048 ,  H04W8/186 ,  H04W48/08

摘要： A method of mapping transmission stations in a wireless network groups the transmission stations such that all transmission stations in the same group transmit a sounding signal at the same time. A method of grouping transmission stations in a wireless network includes sorting (1000) the transmission stations in descending order according to the number of unmapped transmission links, evaluating (2000) the transmission stations based on how many unmapped transmission links can be mapped if the evaluated transmission station is made to transmit a sounding signal, placing (3000) the transmission stations into groups, based on the evaluations, until all of the transmission links are mapped or until the maximum number of sounding bands is used, and if all of the transmission links are not mapped, repeating (4000) the sorting, evaluating, and placing for each time symbol until all of the transmission links are mapped.

摘要翻译： 映射传输站的无线网络中的基团A方式的传输站搜索做在同一组中的所有传输站发射在所述的Sametime一个探测信号。 在无线网络中的分组的传送站的方法，包括分选（1000）在雅丁降序未映射的传输链路（2000）的数量，评估所述传送站的传送站基于有多少未映射的传输链路可以如果所评估的被映射 传送站被制成发射探测信号，将（3000）的发送站成组的基础上，定期评价，直到所有的传输链路的映射，或者直到被用于探测频带的最大数目，并且如果所有的传输的 链接没有被映射，则重复（4000）排序，评估，和直到所有的传输链路的映射将针对每个时间符号。