公开(公告)号：US06195565B1

公开(公告)日：2001-02-27

申请号：US09033985

申请日：1998-03-03

申请人： Peter A. Dempsey ,  Kyoo J. Lee ,  Stuart Warmink

发明人： Peter A. Dempsey ,  Kyoo J. Lee ,  Stuart Warmink

IPC分类号： H04B7216

CPC分类号： H04L47/828 ,  H04L47/70 ,  H04L47/788

摘要： A data system, such as a computer network or a telecommunications system, has a base station and a number of nodes called network interface units (NIUs). Each NIU is assigned to one of a number of groups of NIUs. The base station transmits special data to the NIUs indicating which groups of NIUs are currently authorized to transmit upstream messages to the base station, where only the authorized NIUs are allowed to transmit upstream messages. When message collisions in the upstream direction becomes a problem, the base station can reduce the number of NIU groups that are authorized at any given time to transmit upstream messages, in order to attempt to reduce the rate of message collisions. In one possible embodiment, each NIU is assigned horizontal and vertical group words that identify to which group it is assigned. The special data contain additional horizontal and vertical code words that are monitored by the NIUs. If the bits in the downstream code words appropriately match the corresponding bits in the NIU's assigned group words, then the NIU recognizes that it is authorized to transmit upstream messages to the base station. Otherwise, it is not. The horizontal and vertical code words correspond to two-dimensional patterns that indicate which subset of NIU groups are authorized at any given time. By cycling through a series of 2D patterns, the base station ensures that each NIU is authorized at least some of the time. Depending on the number of bits in the code words, a back-off scheme can be designed with different back-off levels, each of which authorizes a different number of groups to transmit. The base station can progressively decrease the rate of upstream transmission by selecting back-off levels with fewer and fewer NIU groups authorized to transmit.

摘要翻译： 诸如计算机网络或电信系统的数据系统具有基站和多个称为网络接口单元（NIU）的节点。 每个NIU被分配到NIU的多个组中的一个。 基站向NIU发送特殊数据，指示NIU当前被授权哪些组向基站发送上行消息，其中只允许授权的NIU发送上行消息。 当上游方向的消息冲突成为问题时，基站可以减少在任何给定时间授权的NIU组的数量以发送上行消息，以便尝试降低消息冲突的速率。 在一个可能的实施例中，每个NIU被分配水平和垂直组字，其标识被分配给哪个组。 特殊数据包含由NIU监视的附加水平和垂直码字。 如果下游码字中的比特与NIU分配的组字中的相应比特适当匹配，则NIU识别出被授权向基站发送上行消息。 否则，它不是。 水平和垂直码字对应于指示在任何给定时间授权的NIU组的哪个子集的二维模式。 通过循环通过一系列2D模式，基站确保每个NIU至少在某些时间被授权。 根据代码字中的位数，可以设计具有不同退避级别的退避方案，每个退避级别授权不同数量的组进行传输。 基站可以通过选择授权传输的越来越少的NIU组来选择退避等级，逐渐降低上行传输速率。

公开(公告)号：US06169726A

公开(公告)日：2001-01-02

申请号：US09213930

申请日：1998-12-17

申请人： Peter A. Dempsey ,  Clifford B. Stern ,  Gordon D. Woods

发明人： Peter A. Dempsey ,  Clifford B. Stern ,  Gordon D. Woods

IPC分类号： G01R3108

CPC分类号： H04Q3/54558 ,  H04Q2213/13104 ,  H04Q2213/13106 ,  H04Q2213/13166 ,  H04Q2213/13167 ,  H04Q2213/13396

摘要： A method and apparatus for switching from an active to a standby controller in a redundant duplex carrier system without requiring retransmission of messages in progress during the switch. A main processor in the standby controller is periodically switched and made the active controller to ensure reliability of the system. The main processor in the active controller stops sending messages for a period of time before switching control to the standby controller. The main processor in the standby controller delays initiating any new communications until any current messages have been completed from the active controller. The main processor of the standby controller then retrieves any unprocessed messages that may have been sent to the active controller just before or during the switch from the active controller to the standby controller. The delay of new messages and retrieval of any unprocessed messages ensures that no data will be lost during the switch, thus removing the need for retransmission.

摘要翻译： 一种用于在冗余双工载波系统中从主动控制器切换到备用控制器的方法和装置，而不需要在切换期间重传正在进行的消息。 备用控制器中的主处理器周期性地切换并使主动控制器确保系统的可靠性。 主控制器中的主处理器在将控制切换到备用控制器之前停止发送消息一段时间。 待机控制器中的主处理器延迟启动任何新的通信，直到有效控制器完成任何当前消息。 然后，待机控制器的主处理器将在从主动控制器切换到备用控制器之前或期间检索可能已经发送到主动控制器的任何未处理的消息。 新消息的延迟和任何未处理的消息的检索确保了在交换机期间不会丢失数据，从而消除了对重传的需要。