Method for Scheduling Data Transmission in Hybrid Communication Networks for Transportation Safety Systems
    22.
    发明申请
    Method for Scheduling Data Transmission in Hybrid Communication Networks for Transportation Safety Systems 有权
    运输安全系统混合通信网络数据传输调度方法

    公开(公告)号:US20120147879A1

    公开(公告)日:2012-06-14

    申请号:US12979777

    申请日:2010-12-28

    IPC分类号: H04W72/04 H04W56/00

    CPC分类号: H04W72/1242

    摘要: A hybrid communication network for a transportation safety system includes a fixed wired nodes and mobile wireless nodes. Because the wired nodes operate independently packets transmitted by the wired nodes to the wireless nodes need to be synchronized. A downlink travel time for downlink packets traveling from a controller to the wireless nodes is determined. Then, the controller schedules downlink data intervals (DDI) based on the downlink travel time; and transmits downlink packets to the wireless nodes during the DDI, such that a latency requirement of the transportation safety system is satisfied.

    摘要翻译: 用于运输安全系统的混合通信网络包括固定有线节点和移动无线节点。 由于有线节点独立运行,有线节点传输到无线节点的数据包需要同步。 确定从控制器到无线节点的下行链路分组的下行链路行进时间。 然后,控制器基于下行链路行进时间调度下行链路数据间隔(DDI); 并且在DDI期间向无线节点发送下行链路分组,使得满足运输安全系统的等待时间要求。

    Wireless Communication Network for Transportation Safety Systems
    23.
    发明申请
    Wireless Communication Network for Transportation Safety Systems 失效
    运输安全系统无线通信网络

    公开(公告)号:US20120129458A1

    公开(公告)日:2012-05-24

    申请号:US12950683

    申请日:2010-11-19

    IPC分类号: H04B7/00

    CPC分类号: B66B1/34 B66B5/0031 B66B13/22

    摘要: In a network for a safety system in a transportation system, the transportation system includes a shaft and a car arranged in the shaft. A first wall node is at a first end of the shaft and a second wall node is at a second end of the shaft to communicate safety messages with the car. Each wall node includes at least one wireless transceiver connected to one or more antennas. Each car in the shaft includes at least two wireless transceiver connected to one or more antennas, wherein the first transceiver of the car uses a first frequency and the second transceiver of the car uses a second frequency to communicate each safety messages in duplicate. A wired backbone connects the set of wall nodes to a controller of the safety system of the transportation system.

    摘要翻译: 在用于运输系统中的安全系统的网络中,运输系统包括布置在轴中的轴和轿厢。 第一壁节点位于轴的第一端,并且第二壁节点位于轴的第二端,以将安全信息与轿厢通信。 每个墙壁节点包括连接到一个或多个天线的至少一个无线收发器。 轴中的每个汽车包括连接到一个或多个天线的至少两个无线收发器,其中汽车的第一收发器使用第一频率,并且汽车的第二收发器使用第二频率来重复地传送每个安全消息。 有线骨干将该组墙壁节点连接到运输系统的安全系统的控制器。

    Fast handover protocols for WiMAX networks
    24.
    发明授权
    Fast handover protocols for WiMAX networks 有权
    WiMAX网络的快速切换协议

    公开(公告)号:US08094621B2

    公开(公告)日:2012-01-10

    申请号:US12370750

    申请日:2009-02-13

    IPC分类号: H04W4/00

    CPC分类号: H04W36/0055 H04W36/0038

    摘要: A method performs handover of a mobile station (MS from a current base station (BSC) connected to a target base station (BST) via a backbone in a Worldwide interoperability for Microwave Access (WiMAX) mobile communication network. The MS, before handover, transmits a Connection Identifier Request (CID-REQ) to the BST via the BSC, and receiving a Connection Identifier Response (CID-RSP) from the BST via the BSC. The MS, before handover, transmits a Subscriber Station (SS) Basic Capability Request (SBC-REQ), and receives a SS Basic Capability Response (SBC-RSP) from the BST via the BSC. Then, the MS transmits a Ranging Request (RNG-REQ) to the BST, and receives a Ranging Response (RNG-RSP) from the BST. During the handover, the MS transmits a Registration Request (REG-REQ) to the BST, and receives a Registration Response from the BST to establish the connection between the MS and the BST.

    摘要翻译: 一种方法是在全球微波接入(WiMAX)移动通信网络的互操作性中,经由骨干网执行移动台(来自连接到目标基站(BST)的当前基站(BSC))的切换, 通过BSC向BST发送连接标识符请求(CID-REQ),并通过BSC从BST接收连接标识符响应(CID-RSP),MS在切换之前发送用户站(SS)基本能力 请求(SBC-REQ),并通过BSC从BST接收SS基本能力响应(SBC-RSP),然后MS向BST发送测距请求(RNG-REQ),并接收测距响应(RNG -RSP),在切换期间,MS向BST发送注册请求(REG-REQ),并从BST接收注册响应以建立MS与BST之间的连接。

    Method and system for decoding OFDM signals subject to narrowband interference
    25.
    发明授权
    Method and system for decoding OFDM signals subject to narrowband interference 有权
    用于对经受窄带干扰的OFDM信号进行解码的方法和系统

    公开(公告)号:US08428165B2

    公开(公告)日:2013-04-23

    申请号:US12982636

    申请日:2010-12-30

    IPC分类号: H04B1/10 H04L27/28

    摘要: A method estimates a wireless channel at a receiver. The signal is transmitted using narrowband orthogonal frequency division demultiplexing (OFDM) and frequency subcarriers, and the signal includes a set of data tones and a set of pilot tones. The channel and pilot tone interference are estimated based on all the pilot tones extracted from the signal and a channel model. The set of data are equalized based on the channel estimate. Data interference is detected according to the pilot interference and the equalized data tones. Subcarrier interference-to-noise ratios are determined based on the data interference. Signal strengths of the data tones are determined based on the equalized data tones, log-likelihood ratios of bits represented by the data tones are determined based on the subcarrier interference-to-noise ratios and the signal strength of the data tones.

    摘要翻译: 一种方法估计接收机处的无线信道。 该信号使用窄带正交频分解复用(OFDM)和频率副载波来发送,并且该信号包括一组数据音调和一组导频音。 基于从信号提取的所有导频音和信道模型来估计信道和导频音干扰。 该数据集合基于信道估计来均衡。 根据导频干扰和均衡数据音调检测数据干扰。 基于数据干扰确定子载波干扰噪声比。 基于均衡的数据音调确定数据音调的信号强度,基于副载波干扰信噪比和数据音调的信号强度来确定由数据音调表示的比特的对数似然比。

    Synchronous Data Transmission in Hybrid Communication Networks for Transportation Safety Systems
    26.
    发明申请
    Synchronous Data Transmission in Hybrid Communication Networks for Transportation Safety Systems 审中-公开
    用于运输安全系统的混合通信网络中的同步数据传输

    公开(公告)号:US20120147864A1

    公开(公告)日:2012-06-14

    申请号:US12964283

    申请日:2010-12-09

    IPC分类号: H04W84/02

    CPC分类号: B66B13/22 H04W84/047

    摘要: A hybrid communication network for a transportation safety system includes a wired network including a set of fixed nodes. Each fixed node includes a wired interface for connecting the fixed node to the wired network and at least one wireless interface. The set of fixed nodes further includes a head node at a first end of the wired network connected to a controller, a terminal node at a second end of the wired network, and a set of relay nodes arranged between the head node and the terminal node. A wireless network includes a set of mobile nodes and a set of fixed nodes connected to the wired network. Each mobile node includes at least one of the wireless interfaces, and each mobile node is arranged in a moveable car.

    摘要翻译: 用于运输安全系统的混合通信网络包括包括一组固定节点的有线网络。 每个固定节点包括用于将固定节点连接到有线网络和至少一个无线接口的有线接口。 所述固定节点集合还包括连接到控制器的有线网络的第一端的头节点,有线网络的第二端的终端节点以及布置在所述头节点和所述终端节点之间的一组中继节点 。 无线网络包括一组移动节点和连接到有线网络的一组固定节点。 每个移动节点包括无线接口中的至少一个,并且每个移动节点被布置在可移动的车中。

    Unified STTC Encoder for WAVE Transceivers
    28.
    发明申请
    Unified STTC Encoder for WAVE Transceivers 失效
    用于WAVE收发器的统一STTC编码器

    公开(公告)号:US20100246703A1

    公开(公告)日:2010-09-30

    申请号:US12503465

    申请日:2009-07-15

    IPC分类号: H04L23/02

    摘要: A transmitter encodes an input bitstream using space-time trellis coding (STTC). The encoder includes a serial to parallel convertor to produce a first and second output bitstreams. First and second three bit shift registers are connected to produce first and second output bitstreams. A multiplier applies a code generating weight to each bit of the shift registers to encode the bitstreams. A first switch is connected between a last bit of the first shift register and a first bit of the second shift register. A second switch is connected between the second output and the first bit of the second shift register. The first set of encoded bit streams and the second set of encoded bitstreams are combined and mapped to a frequency domain.

    摘要翻译: 发射机使用空时网格编码(STTC)对输入比特流进行编码。 编码器包括串行到并行转换器以产生第一和第二输出比特流。 连接第一和第二三位移位寄存器以产生第一和第二输出比特流。 乘法器将代码生成权重应用于移位寄存器的每个位以对比特流进行编码。 第一开关连接在第一移位寄存器的最后位和第二移位寄存器的第一位之间。 第二开关连接在第二输出端和第二移位寄存器的第一位之间。 第一组编码比特流和第二组编码比特流被组合并映射到频域。

    Method for transmitting packets in relay networks
    29.
    发明授权
    Method for transmitting packets in relay networks 有权
    在中继网络中传输数据包的方法

    公开(公告)号:US08243649B2

    公开(公告)日:2012-08-14

    申请号:US12324604

    申请日:2008-11-26

    IPC分类号: H04B7/14

    CPC分类号: H04B7/15592

    摘要: A method transmits an L bit packet in a relay network including a source node, a relay node and a destination node. The source node partitions the packet into first fragment of βL bits and a second fragment of (1−β) bits. The first fragment is transmitted from the source node to the relay node at a first data rate during a first phase. The second fragment is transmitted from the source node to the destination node at a second data rate during a second phase while the first fragment is retransmitted from the relay node to the destination node at a third data rate.

    摘要翻译: 一种方法在包括源节点,中继节点和目的节点的中继网络中发送L比特分组。 源节点将数据包分成第一个片段(bgr; L位)和第二个片段(1-&bgr))。 在第一阶段期间,第一片段以第一数据速率从源节点传送到中继节点。 第二片段在第二阶段期间以第二数据速率从源节点传送到目的地节点,而第一片段以第三数据速率从中继节点重传到目的地节点。

    Inter-cell interference prediction for frequency resource allocation
    30.
    发明授权
    Inter-cell interference prediction for frequency resource allocation 有权
    频率资源分配的小区间干扰预测

    公开(公告)号:US08036674B2

    公开(公告)日:2011-10-11

    申请号:US12408667

    申请日:2009-03-20

    IPC分类号: H04W72/00 H04W4/00

    CPC分类号: H04W72/082

    摘要: A method predicts resource allocations in a wireless network including a set of base stations (BSs). Each BS is in a cell, and serves a set of mobile stations. A sequence and rule of resource allocations are defined for all of the BSs. Previous resource allocations are acquired from the BSs in adjacent cells. In each BS, for a next allocation, inter-cell interference (ICI) is predicted independently for the set of MSs in the cell based on the previous resource allocations by the BSs in the adjacent cells and the sequence and rule of resource allocations. Then, each BS allocates the resources to the MSs in the cell based on the ICI and the previous resource allocations.

    摘要翻译: 一种方法预测包括一组基站(BS)在内的无线网络中的资源分配。 每个BS都在一个小区中,服务于一组移动台。 为所有BS定义资源分配的序列和规则。 先前的资源分配是从相邻小区中的BS获取的。 在每个BS中,对于下一个分配,基于相邻小区中的BS的先前资源分配以及资源分配的顺序和规则,针对小区中的MS集合独立地预测小区间干扰(ICI)。 然后,每个BS基于ICI和先前的资源分配将资源分配给小区中的MS。