Virtual private network system over public mobile data network and virtual LAN
First Claim
1. A virtual private network system accessed by an internet, comprising:
- a virtual local area network (LAN) connected to a LAN emulation server and LAN emulation clients;
a router connected between said internet and said virtual LAN;
a public mobile data network connected to a location register and mobile data subscriber processing units;
a data gateway connected between said internet and said public mobile data network;
a virtual private network gateway connected between said virtual LAN and said public mobile data network; and
a mobile data terminal having one internet protocol (IP) address and one network address of said public mobile data network and capable of being connected to either one of said LAN emulation clients or one of said mobile data subscriber processing units,wherein said location register storing a correspondence between said network address and one of said mobile data subscriber processing units,wherein said virtual private network gateway comprises;
a memory for storing a correspondence between said IP address and said network address of said mobile data terminal;
a communication control section communicatively connected to said public mobile data network;
a call control section having a LAN emulation capability; and
a transmission control protocol/internet protocol (TCP/IP) interface communicatively connected to said virtual LAN.
1 Assignment
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Accused Products
Abstract
In a virtual private network system accessed by an internet, a virtual local area network (LAN) is connected to a LAN emulation server and IAN emulation clients, and a router is connected between the internet and the virtual LAN. Also, a public mobile data network is connected to a location register and mobile data subscriber processing units, and a data gateway is connected between the internet and the public mobile data networks Further, a virtual private network gateway is connected between the virtual LAN and the public mobile data network. A mobile data terminal having one IP address and one public network address and can be connected to either one of the LAN emulation clients or one of the mobile data subscriber processing units.
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Citations
12 Claims
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1. A virtual private network system accessed by an internet, comprising:
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a virtual local area network (LAN) connected to a LAN emulation server and LAN emulation clients; a router connected between said internet and said virtual LAN; a public mobile data network connected to a location register and mobile data subscriber processing units; a data gateway connected between said internet and said public mobile data network; a virtual private network gateway connected between said virtual LAN and said public mobile data network; and a mobile data terminal having one internet protocol (IP) address and one network address of said public mobile data network and capable of being connected to either one of said LAN emulation clients or one of said mobile data subscriber processing units, wherein said location register storing a correspondence between said network address and one of said mobile data subscriber processing units, wherein said virtual private network gateway comprises; a memory for storing a correspondence between said IP address and said network address of said mobile data terminal; a communication control section communicatively connected to said public mobile data network; a call control section having a LAN emulation capability; and a transmission control protocol/internet protocol (TCP/IP) interface communicatively connected to said virtual LAN. - View Dependent Claims (2, 4, 5, 6, 7)
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3. A virtual private network system comprising:
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a virtual local area network (LAN); a public mobile data network; a virtual private network gateway connected between said virtual LAN and said public mobile data network; means for registering a correspondence between an internet protocol (IP) address and a public network address of a mobile data terminal in said virtual private network gateway, when said mobile data terminal enters in a service area of said public mobile data network; and means for transmitting data addressed to said IP address in said virtual LAN via said virtual private network gateway to said public mobile data network, said IP address being converted into said public network address in said virtual private network gateway, wherein said means for transmitting sends said data via said virtual private network gateway to said mobile data terminal only when said mobile data terminal is located in said public mobile data network.
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8. A method for registering a location of a data terminal in a public mobile data network, comprising:
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a) writing an IP address of the data terminal into a random access memory (RAM) of a mobile station that is communicatively connected to the data terminal; b) recognizing, by the data terminal associated with the mobile station, an information signal from a mobile base station that services a portion of the public mobile data network; c) generating, by the mobile station, a location registration request signal including the IP address stored in the RAM and a public mobile data network address of the mobile station that is stored in a read-only memory (ROM) of the mobile station; d) transmitting the location registration request signal from the mobile station to a mobile data subscriber processing unit that constitutes an interface to the public mobile data network; e) generating, by a call control section of the mobile data subscriber processing unit, an approval request signal including the public mobile data network address of the mobile station, and transmitting the approval request signal to a location register that is communicatively connected to the public mobile data network; f) searching, by the location register, for a first approval key in accordance with the approval request signal; g) if the searching is successful, generating and transmitting, by the location register to the call control section, an approval response signal including the first approval key; h) generating, by the call control section, a pseudo-random number and transmitting the approval request signal along with the pseudo-random number; i) carrying out, by the mobile data subscriber processing unit, a calculation based upon the pseudo-random number and the first approval key to obtain a first result, and simultaneously, in the mobile station, carrying out a calculation based on the pseudo-random number and a second approval key stored in the ROM of the mobile station to obtain a second result; j) generating, by the mobile station, an approval response signal including the second result; k) comparing, by the mobile data subscriber unit, the first and second results; l) when there is a match as a result of the comparing performed in step k), generating and transmitting, to the location register, a location registration request signal that includes a location of the mobile data subscriber unit and the public mobile data network address of the mobile station; and m) when there is no match as a result of the comparing performed in step k), stopping any further call processing. - View Dependent Claims (9, 10, 11, 12)
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Specification