| 摘要 |
The present invention provides IP multicast using over wireless ATM. A wireless ATM system consists of a fixed core network and a shared wireless access link for mobile terminals. Unlike point-to-point ATM links within the fixed/wired network, wireless ATM link uses a common VC space for all mobile terminals and the medium access (MAC) protocol allows multiple access on the downlink, but supports only unicast transmission on the uplink. This invention also provides how IP multicast can be naively supported on such WATM links through specific extensions to the Internet Group Management Protocol (IGMP). In addition, a cell-level error recovery scheme at the DLC (data link, control) layer is provided to enhance the (IP) packet-level output of the transport layer. <IMAGE> |
