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A hybrid ARQ method for packet data transmission in a mobile communication system wherein previously transmitted packets are combined with retransmitted packets, said packets being segmented into a plurality of protocol data units PDUs, each being assigned a sequence number for identification purpos

A hybrid ARQ method for packet data transmission in a mobile communication system wherein previously transmitted packets are combined with retransmitted packets, said packets being segmented into a plurality of protocol data units PDUs, each being assigned a sequence number for identification purposes. According to the invention the sequence number is transmitted on a control channel which is separate from the data channel for transmitting the PDUs.

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A hybrid ARQ method for packet data transmission in a mobile communication system wherein previously transmitted packets are combined with retransmitted packets, said packets being segmented into a plurality of protocol data units PDUs, each being assigned a sequence number for identification purpos

A hybrid ARQ method for packet data transmission in a mobile communication system wherein previously transmitted packets are combined with retransmitted packets, said packets being segmented into a plurality of protocol data units PDUs, each being assigned a sequence number for identification purposes. According to the invention the sequence number is transmitted on a control channel which is separate from the data channel for transmitting the PDUs. st computer selected from one of the plurality of host computers coupled to the first network medium, said link layer gateway computer determining whether said data packet is addressed to a host computer on said first or second network medium; and blocking transmission of said data packet through said link layer gateway computer if said data packet is addressed to a host computer in the same network medium; determining at said gateway computer whether said data packet is addressed to said gateway computer; and responsive to a positive determination communicating between said source host and said gateway computer. 2. The network configuration of claim 1 wherein the second network medium is a local area network. 3. The network configuration of claim 1 wherein the second network medium is a wide area network. 4. The network configuration of claim 1 wherein the second network medium comprises an Ethernet network. 5. The network configuration of claim 1 wherein the link layer gateway computer comprises: a first network interface circuit coupled to the first network medium; and a second network interface circuit coupled to the second network medium. 6. The network configuration of claim 5: wherein the link layer gateway computer is programmed to execute an IP protocol handler coupled to communicate with each of the first and second network interface circuits; wherein the link layer gateway computer has an assigned IP address; wherein, responsive to either of the first and second network interface circuits receiving a data packet, the IP protocol handler evaluates a destination IP address in the received data packet; and wherein the IP protocol handler is responsive to the received data packet if the destination IP address corresponds to the assigned address of the link layer gateway computer. 7. The network configuration of claim 6 wherein the link layer gateway computer is programed to execute an application-program coupled to communicate with the IP protocol handler. 8. The network configuration of claim 6: wherein the link layer gateway computer is programmed to execute a link layer protocol handler coupled to communicate with each of the first and second network interface circuits; wherein, responsive to either of the first and second network interface circuits receiving a data packet comprising an IP communication, the link layer protocol handler evaluates a destination IP address in the received data packet; and wherein, responsive to determining that the destination IP address does not correspond to the assigned address of the link layer gateway computer, the link layer protocol handler determines if a source host computer which transmitted the received data packet and the destination host computer designated by the destination IP address are not on the same one of either the first network medium or the second network medium. 9. The network configuration of claim 8 wherein the IP protocol handler is independent of the link layer protocol handler. 10. The network configuration of claim 8 wherein, responsive to the link layer. protocol handler determining that the source host computer which transmitted the received data packet and the destination host computer designated by the destination IP address are not on the same one of either the first network medium or the second network medium, the link layer protocol communicates the received data packet from the network medium connected to the source host computer to the network medium connected to the destination host computer. 11. The network configuration of claim 10: wherein the received data packet further comprises a hardware physical address; wherein the destination host computer comprises a network interface circuit coupled to one of either the first network medium or the second network medium; wherein the network interface circuit of the destination host computer is responsive to a destination hardware physical address; and wherein, prior to c