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In a mobile communication system having mobile foreign agents, the present invention eliminates the use of multiple source/destination headers attached to an information packet during the tunneling operation by using either a decapsulation/encapsulation or a forwarding operation with the encapsulate

In a mobile communication system having mobile foreign agents, the present invention eliminates the use of multiple source/destination headers attached to an information packet during the tunneling operation by using either a decapsulation/encapsulation or a forwarding operation with the encapsulated information packet. Either of these operations reduces the overhead incurred in the multiple encapsulation headers by reducing encapsulation of the information packet to a single level. Upon receipt of the information packet at the foreign agent on the communications system, the information packet is directed to the mobile node using a routing chain table maintained by the foreign agent or a next hop routing table maintained by the foreign agent and each mobile foreign agent in the transmission path. Once implemented, these data structures can also assist with routing of information packets within the foreign subnetwork.

대표청구항 ▼

In a mobile communication system having mobile foreign agents, the present invention eliminates the use of multiple source/destination headers attached to an information packet during the tunneling operation by using either a decapsulation/encapsulation or a forwarding operation with the encapsulate

In a mobile communication system having mobile foreign agents, the present invention eliminates the use of multiple source/destination headers attached to an information packet during the tunneling operation by using either a decapsulation/encapsulation or a forwarding operation with the encapsulated information packet. Either of these operations reduces the overhead incurred in the multiple encapsulation headers by reducing encapsulation of the information packet to a single level. Upon receipt of the information packet at the foreign agent on the communications system, the information packet is directed to the mobile node using a routing chain table maintained by the foreign agent or a next hop routing table maintained by the foreign agent and each mobile foreign agent in the transmission path. Once implemented, these data structures can also assist with routing of information packets within the foreign subnetwork. upply voltage. 12. A circuit according to claim 11, further comprising a second MOS transistor connected in a source-follower configuration and having a control terminal coupled to the dummy wordline, a first conduction terminal coupled to a first voltage reference, and a second conduction terminal coupled to an input of the comparing means. 13. A circuit according to claim 12 wherein said second MOS transistor is connected, in series with another transistor, between the first voltage reference and a second voltage reference. 14. A circuit according to claim 13, wherein the first conduction terminals of the first and second MOS transistors are connected to each other. 15. A circuit according to claim 12 wherein the second MOS transistor connected in a source-follower configuration. 16. A circuit according to claim 15, wherein said first and second MOS transistors are the same size. 17. A circuit according to claim 11, further comprising an inverter and a signal generator, the inverter connecting an output of the comparing means to the signal generator. 18. A circuit according to claim 17 wherein said signal generator is a set/reset flip-flop having a set input that receives an ATD signal and a reset input connected to the output of the comparing means. 19. A circuit according to claim 11, further comprising a second MOS transistor having a control terminal that receives an enable signal and an output terminal connected to an output of the comparing means to bias the output of the comparing means when the comparing means are inactive. 20. A circuit according to claim 11, further comprising a voltage divider connected between the supply voltage and a reference voltage and having an intermediate node connected to the control terminal of the first MOS transistor.