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    • 4. 发明授权
    • System and method for providing contention channel organization for broadband satellite access in a communications network
    • 在通信网络中为宽带卫星接入提供竞争信道组织的系统和方法
    • US06980800B2
    • 2005-12-27
    • US10074759
    • 2002-02-12
    • Anthony NoerpelChannasandra RavishankarXiaoping HeAbheek Saha
    • Anthony NoerpelChannasandra RavishankarXiaoping HeAbheek Saha
    • H04W74/08H04Q7/20H04B7/212
    • H04W74/0833
    • Two types of contention channels are used to accommodate broadband packet data in a satellite communication network. A first contention channel is used by unsynchronized user terminals to access the system and request a traffic channel. The first contention channel is of a sufficient duration to accommodate a RACH message, as well as the timing uncertainty between user terminals within a given spot beam. A second contention channel is shorter in duration than the first contention channel, and is narrowband, so that more than one second contention channel may be transmitted within the bandwidth of the broadband traffic channels. The second contention channels are used by synchronized user terminals for transmitting packet RACH, or PRACH, messages. The more efficient nature of the PRACH channels accommodates the increased overhead associated with bursty packet data, without the capacity cost of the longer duration RACH channel.
    • 两种类型的竞争通道用于在卫星通信网络中容纳宽带分组数据。 不同步的用户终端使用第一争用通道访问系统并请求业务信道。 第一争用信道具有足够的持续时间以适应RACH消息,以及在给定点波束内的用户终端之间的定时不确定性。 第二争用信道的持续时间比第一竞争信道短,并且是窄带,使得可以在宽带业务信道的带宽内传输多于一个的第二争用信道。 第二争用信道由同步用户终端用于发送分组RACH或PRACH消息。 PRACH信道的更高效的性质适应与突发分组数据相关联的增加的开销,而不需要较长持续时间的RACH信道的容量成本。
    • 8. 发明授权
    • Physical layer header for packet data
    • 分组数据的物理层报头
    • US06859466B1
    • 2005-02-22
    • US09707362
    • 2000-11-07
    • Xiang ChenAnthony NoerpelEnrique LabordeDavid Roos
    • Xiang ChenAnthony NoerpelEnrique LabordeDavid Roos
    • H04L1/00H04J3/06
    • H04L1/0039H04L1/0003H04L1/0009H04L1/0025H04L1/0072
    • An approach for is provided for adapting to a variety of link propagation conditions is disclosed. A source terminal generates a packet data burst that includes a header and an optional payload. The header is modulated using a default modulation scheme and is coded using a default coding scheme. A switch is configured to receive and to forward the packet data burst. A destination terminal is configured to demodulate the header using the default modulation scheme and the default coding scheme, and to examine the header to determine a particular coding scheme and a particular modulation scheme associated with the payload. The protocol can be applied to any radio communication system, particularly, to a satellite communication system with multiple satellite terminals.
    • 公开了一种用于适应各种链路传播条件的方法。 源终端产生包括报头和可选有效载荷的分组数据突发。 使用默认调制方案调制报头,并使用默认编码方案进行编码。 交换机被配置为接收和转发分组数据突发。 目的地终端被配置为使用默认调制方案和默认编码方案来解调头部,并且检查头部以确定特定编码方案和与有效载荷相关联的特定调制方案。 该协议可以应用于任何无线电通信系统,特别是适用于具有多个卫星终端的卫星通信系统。