公开(公告)号：US06629261B1

公开(公告)日：2003-09-30

申请号：US09717498

申请日：2000-11-21

申请人： Lakshmana Rao Chintada ,  Liang A. Hong ,  Kamyar Moinzadeh ,  Donald P. Wahlstrom

发明人： Lakshmana Rao Chintada ,  Liang A. Hong ,  Kamyar Moinzadeh ,  Donald P. Wahlstrom

IPC分类号： G02H305

CPC分类号： H04L1/1848 ,  H04L1/1621 ,  H04L1/1664 ,  H04L1/1685 ,  H04L1/1809

摘要： A method of recovering lost frames transmitted between a packet data sending unit and a packet data receiving unit in a data communications system is disclosed. When a frame is successfully received by the packet data receiving unit, it identifies a failure to successfully receive prior frames, i.e., at least one frame prior to the frame successfully received at the packet data receiving unit. The packet data receiving unit starts a selective reject wait timer and determines whether the number of frames missed so far is greater than or equal to a predetermined threshold. If the number of missed frames is greater than or equal to the preset limit, the packet data receiving unit generates a selective reject message that includes a payload indicating a first missed frame and subsequent missed frames. If the number of missed frames is less than the predetermined threshold, the packet data receiving unit waits until the expiration of the selective reject wait timer, or until after the next determination that the number of missed frames meets or exceeds the predetermined threshold. It then sends the selective reject message to the packet data sending unit. Upon successful receipt of the retransmitted missed frames from the packet data sending unit, the packet data receiving unit generates a receive ready message and sends the receive ready message to the packet data sending unit.

摘要翻译： 公开了一种在数据通信系统中恢复分组数据发送单元与分组数据接收单元之间传输的丢失帧的方法。 当分组数据接收单元成功接收到帧时，它识别成功接收先前帧的失败，即，在分组数据接收单元成功接收到帧之前的至少一个帧。 分组数据接收单元启动选择性拒绝等待定时器，并确定到目前为止丢失的帧数是否大于或等于预定阈值。 如果丢失帧的数量大于或等于预设限制，则分组数据接收单元产生选择性拒绝消息，该消息包括指示第一丢失帧和后续丢帧的有效载荷。 如果丢失帧的数量小于预定阈值，则分组数据接收单元等待直到选择性拒绝等待定时器到期，或者直到下次确定后，错过的帧的数量满足或超过预定阈值。 然后将选择性拒绝消息发送到分组数据发送单元。 在从分组数据发送单元成功接收到重传的丢失帧之后，分组数据接收单元生成接收就绪消息，并将接收就绪消息发送到分组数据发送单元。