Data transmission
A communications device ( 1 ) communicates with an access point ( 7 ) to gateway ( 21 ) and local area network ( 13 ) by a wired or wireless communications link ( 9 ). These components may, for example, be accommodated on a train or serve some other predefined area. Gateway ( 21 ) receives data packets from device ( 1 ) representing information for transmission via that device's “home” communication system ( 15 ) to a destination device. The gateway ( 21 ) creates packet data protocol channels ( 27,29,31 ) with a plurality of communication systems ( 15,23 ) and ( 25 ) and sends the data packets received from the device ( 1 ) selectively over each of these communications channels ( 27,29,31 ). A link between a communications systems ( 23 ) and ( 25 ) allows the data packets to be forwarded to the communications system ( 15 ) where they are compiled by concentrator ( 49 ) for onward transmission. The communication systems ( 15,23,25 ) may be mobile or cellular communications systems.
1. A method of transmitting information between a first device and a second device, the method comprising:
receiving at a first node a plurality of data packets representing the information from said first device, each of said data packets including a first header indicative of the identity of said second device;
adding, at said first node, to each of said data packets a second header indicative of the identity of one of a plurality of different intermediate destinations, wherein said first node is positioned in a communication path between said first device and said plurality of intermediate destinations;
monitoring communication characteristics of a plurality of communications systems;
transmitting said data packets by said first node distributing respective ones of said data packets received from said first device over different ones of the plurality of communications systems to said plurality of intermediate destinations based on the indications of said second headers and in dependence upon the monitored characteristics; and
re-assembling said data packets into a form said data packets took when originally transmitted by said first device and delivering said re-assembled data packets to said second device based on the indication of said first headers,
wherein said data packets are transmitted by at least two of said plurality of communications systems by one or more packet data protocol (PDP) channels formed by each of said at least two communications systems.
2. The method of claim 1 , wherein said plurality of communications systems includes at least two wireless communications systems.
3. The method of claim 1 , wherein said communications systems comprise cellular or mobile telecommunications systems.
4. The method of claim 1 , wherein said communications systems comprise GSM or 3G (UMTS) cellular telecommunications systems.
5. The method of claim 4 , wherein said telecommunications systems each have a respective radio access network.
6. The method of claim 1 , wherein said data packets comprise Internet Protocol (IP) data packets.
7. The method of claim 1 , including receiving said data packets at a control portion of each of said communications systems, and forwarding the received data packets by a communications link to a second node such that the data packets are received by said second device.
8. The method of claim 1 , wherein said second device is registerable with one of said communications systems for direct communication therewith.
9. The method of claim 8 , wherein delivering said re-assembled data packets includes transmitting to the communications system with which said second device is registered said re-assembled data packets.
10. The method of claim 7 , including forming an IPsec channel between said first device and said second node for transmission of said data packets therethrough.
11. The method of claim 1 , including authenticating at least one of said devices with a corresponding one of the communications systems with which said at least one device is registered by means of authentication storage means associated with said at least one device.
12. The method of claim 11 , wherein said authentication storage comprises a smart card, SIM or USIM.
13. The method of claim 1 , including authenticating said first node with each of said communications systems.
14. The method of claim 13 , including authenticating said first node with each of said communications systems using respective authentication storage.
15. The method of claim 1 , wherein the communications systems are monitored in terms of a level of radio signal thereof.
16. The method of claim 15 , wherein the radio signal of each communications system is assessed by test signaling.
17. A system for transmitting information between a first device and a second device, comprising:
a first node configured to:
receive a plurality of data packets representing the information from said first device, each of said data packets including a first header indicative of the identity of said second device;
add to each of said data packets a second header indicative of the identity of one of a plurality of different intermediate destinations;
monitor communication characteristics of a plurality of communications systems; and
transmit said data packets received from said first device by distributing respective ones of said data packets over different ones of the plurality of communications systems to said plurality of intermediate destinations based on the indications of said second headers and in dependence upon the monitored characteristics, wherein said first node is positioned in a communication path between said first device and said plurality of intermediate destinations; and
a second node configured to:
reassemble said data packets into a form said data packets took when originally transmitted by said first device and for delivering said re-assembled data packets to said second device based on the indication of said first headers,
wherein said data packets are transmitted by at least two of said plurality of communications systems by one or more packet data protocol (PDP) channels formed by each of said at least two communications systems.
18. The system of claim 17 , wherein said plurality of communications systems includes at least two wireless communications systems.
19. The system of claim 17 , wherein said communications systems comprise cellular or mobile telecommunications systems.
20. The system of claim 17 , wherein said communications systems comprise GSM or 3G (UMTS) cellular telecommunications systems.
21. The system of claim 20 , wherein said telecommunications systems each have a respective radio access network.
22. The system of claim 17 , wherein said data packets comprise Internet Protocol (IP) data packets.
23. The system of claim 17 , including a control portion for each of said communications systems for receiving said data packets and for forwarding the received data packets by a communications link to the second node such that the data packets are received by said second device.
24. The system of claim 17 , wherein said second device is registerable with one of said communications systems for direct communication therewith.
25. The system of claim 24 , wherein the second node delivers said re-assembled data packets to said second device by delivering said re-assembled data packets to the communications system with which said second device is registered.
26. The system of claim 23 , wherein said first device and said second node are configured to form an IPsec channel between said first device and said second node for transmission of said data packets therethrough.
27. The system of claim 17 , wherein the first node is further configured to authenticate at least one of said devices with a corresponding one of the communications systems with which said at least one device is registered using an authentication storage associated with said at least one device.
28. The system of claim 27 , wherein said authentication storage comprises a smart card, SIM or USIM.
29. The system of claim 17 , wherein the communications systems are monitored in terms of a level of radio signal thereof.
30. The system of claim 29 , wherein the first node is further configured to generate a test signal to assess the radio signal of each communications system.
31. The method of claim 13 , wherein each of said respective authentication storage includes one of a SIM and a USIM.