公开(公告)号：US20110219281A1

公开(公告)日：2011-09-08

申请号：US12674287

申请日：2007-08-20

申请人： Yonggang Wang ,  Bemd Haberland ,  Pingping Xing ,  Bijun Zhang

发明人： Yonggang Wang ,  Bemd Haberland ,  Pingping Xing ,  Bijun Zhang

IPC分类号： H04L1/18 ,  G06F11/14

CPC分类号： G08C25/02 ,  H04L1/0021 ,  H04L1/1825 ,  H04L1/1838 ,  H04L2001/0093

摘要： Disclosed is a method for triggering retransmission in a multicast system, comprising steps of: a base station eNB setting a retransmission condition based on a channel state indication and transmitting the set retransmission condition to a user equipment UE; and the UE comparing the current channel state indication of the UE with the received retransmission condition when receiving an error block, and feeding back a NACK signaling to the eNB trigger a retransmission when the retransmission condition is satisfied. The method according to the present invention is to restrict the trigger of the NACK signaling, by setting the condition of the UE feeding back the NACK signaling when the UE received the error block. Then the feedback signaling on the uplink channel would be restricted, and the retransmission probability would be limited in an appropriate region as in Rel 6 HSDPA, therefore the optimal ratio of efficiency over power would be achieved. Consequently, the number of NACK signaling is restricted so as to avoid the uplink overload. Meanwhile, the retransmission probability is limited so that the optimal ratio of efficiency over power may be achieved.

摘要翻译： 本发明公开了一种在组播系统中触发重传的方法，包括以下步骤：基站eNB根据信道状态指示设定重传条件，并向所述用户设备UE发送所述重传条件; 并且UE在接收到错误块时将UE的当前信道状态指示与接收到的重传条件进行比较，并且当满足重新发送条件时，向eNB发送NACK信令则触发重发。 根据本发明的方法是通过在UE接收到错误块时设置UE反馈NACK信令的条件来限制NACK信令的触发。 那么上行链路信道上的反馈信令将受到限制，重传概率将会在Rel 6 HSDPA中适当的区域受到限制，因此可以实现功率效率的最佳比例。 因此，限制了NACK信令的数量，以避免上行链路过载。 同时，重传概率受到限制，使得可以实现效率超过功率的最佳比率。