公开(公告)号：US20010046875A1

公开(公告)日：2001-11-29

申请号：US09847216

申请日：2001-05-02

Applicant: U.S. PHILIPS CORPORATION.

Inventor： Robert J. Davies

IPC: H04Q007/20

CPC classification number: H04L12/1868 ,  H04L1/1835 ,  H04L1/1874 ,  H04L2001/0093 ,  H04W4/06 ,  H04W84/20

Abstract: A multicast radio data communication system comprising a master (1) and a plurality of slave stations (2, 3, 4), and using a retransmission protocol. Data is transmitted by the master station and received by the slave stations. One slave station is designated the primary slave station, and all other slaves are designated secondary slave stations. Any slave station may transmit a negative acknowledgement but only the primary slave may transmit a positive acknowledgement. Positive and negative acknowledgements are transmitted substantially simultaneously. Negative acknowledgements corrupt reception of the positive acknowledgement by the master station, thereby ensuring that the data is retransmitted. The primary slave station is selected to have the lowest quality radio link, which may be ensured by a power control command from the master.

Abstract translation: 一种组播无线电数据通信系统，包括主（1）和多个从站（2,3,4），并使用重传协议。 数据由主站传送并由从站接收。 一个从站被指定为主从站，所有其他从站都被指定为从站。 任何从站可以发送否定确认，但只有主从站可以发送肯定确认。 正负确认基本上同时传送。 负确认破坏了主站的肯定确认的接收，从而确保重发数据。 选择主从站具有最低质量的无线电链路，这可以通过来自主设备的功率控制命令来确保。