Method for supporting mobility in wireless networks

A method for supporting mobile devices' mobility in wireless networks, each wireless network containing a network server and at least one base station, each base station having a set of care-of addresses, a mobile device having a communication with a correspondent node, wherein the communication is based on transmitting Internet protocol packets,

• characterized by the steps of:
• at a first base station handling the communication:
• receiving a packet sent from the mobile device, said packet having a sender address associated therewith;
• replacing a home address placed in the packet's sender address with a care-of address;
• transmitting the packet to the network server;
• at the network server:
• replacing the care-of address placed in the packet's sender address with the home address, and when the mobile device is located in its home network;
• transmitting the packet to the correspondent node;
• receiving a response packet to the transmitted packet said response packet having a receiver address associated therewith;
• when the mobile device is moved to the area of a second base station,
• replacing a home address placed in the response packet's receiver address with a second care-of address belonging to the second base station;
• transmitting the response packet to the second base station;
• at the second base station:
• replacing the second care-of address placed in the response packet's receiver address with the home address;
• and,
• transmitting the response packet to the mobile device, thus enabling the communication between the mobile device and the correspondent node.

A method for supporting mobile devices' mobility in wireless networks, wherein a mobile device associated with a home network locates temporarily in a geographical area covered a foreign network, the home network having a home network server and the foreign network having a foreign network server, and wherein the mobile device has a communication with a correspondent node, the communication being based on transmitting Internet protocol packets,

• characterized by the steps of:
• at the foreign network server:
• logging in the mobile device's to the foreign network;
• at a foreign base station belonging to the foreign network;
• receiving a packet sent from the mobile device, said packet having a sender address associated therewith;
• replacing a home address placed in the packet's sender address with a care-of address;
• transmitting the packet to the foreign network server;
• at the foreign network server:
• replacing the care-of address placed in the packet's sender address with a visitor address;
• transmitting the packet to the mobile device's home network server;
• at the home network server:
• replacing the visitor address placed in the packet's sender address with the home address;
• transmitting the packet to the correspondent node;
• receiving a response packet as response to the packet transmitted;
• replacing the home address placed in the response packet's receiver address with the visitor address;
• transmitting the response packet to the foreign network server;
• at the foreign network server:
• replacing the visitor address placed in the response packet's receiver address with the care-of address,
• transmitting the response packet to the foreign base station;
• at the foreign base station:
• replacing the care-of address placed in the response packet's receiver address with the home address, and
• transmitting the response packet to the mobile device, thus enabling the communication between the mobile device and the correspondent node.

A system for supporting mobile devices' mobility in wireless networks, the system including at least a network server, and a first base station, the first base station having a set of care-of addresses, wherein a mobile device is adapted to communicate with a correspondent node, the mobile device's communication being based on transmitting Internet protocol packets,

• characterized in that
• the first base station handling said communication is adapted to:
• receive a packet sent from the mobile device, said packet having a sender address field associated therewith;
• replace a home address placed in the packet's sender address field with a care-of address;
• transmit the packet to the network server;
• the network server is adapted to:
• replace the care-of address placed in the packet's sender address field with the home address, and when the mobile device is located in its home network;
• transmit the packet to the correspondent node;
• receive a response packet as response to the packet transmitted, said response packet having a receiver address associated therewith;
• replace a home address placed in the response packet's receiver address with the care-of address;
• transmit the response packet to the first base station;
• the first base station is further adapted to:
• replace the care-of address placed in the response packet's receiver address with the home address;
• and,
• transmit the response packet to the mobile device, thus enabling the communication between the mobile device and the correspondent node.

A system for supporting mobile devices' mobility in wireless networks, wherein the system includes at least a network server, a first base station and a second base station, and wherein a mobile device is adapted to communicate with a correspondent node, the mobile device's communication being based on transmitting Internet protocol packets,

• characterized in that
• the first base station is adapted to:
• receive a packet sent from the mobile device, said packet having a sender address associated therewith;
• replace a home address placed in the packet's sender address with a care-of address;
• transmit the packet to the network server;
• the network server is adapted to:
• replace the care-of address placed in the packet's sender address with the home address, and when the mobile device is located in its home network;
• transmit the packet to the correspondent node;
• receive a response packet as response to the packet transmitted, said response packet having a receiver address associated therewith, and when the mobile device is moved to the area of the second base station;
• replace a home address placed in the response packet's receiver address with a second care-of address belonging to the second base station;
• transmit the response packet to the second base station;
• the second base station is adapted to
• replace the second care-of address placed in the response packet's receiver address with the home address;
• and,
• transmit the response packet to the mobile device, thus enabling the communication between the mobile device and the correspondent node.

A system for supporting mobile devices' mobility in wireless networks, wherein a mobile device associated with a home network locates temporarily in a geographical area covered a foreign network, the home network having a home network server and the foreign network having a foreign network server, and wherein the mobile device is adapted to communicate with a correspondent node, the mobile device's communication being based on transmitting Internet protocol packets,

• characterized in that
• the foreign network server is adapted to
• perform the mobile device's login into the foreign network;
• a foreign base station belonging to the foreign network is adapted to:
• receive a packet sent from the mobile device, said packet having a sender address associated therewith;
• replace a home address placed in the packet's sender address with a care-of address,
• transmit the packet to the foreign network server;
• the foreign network server is further adapted to:
• replace the care-of address placed in the packet's sender address with a visitor address;
• transmit the packet to the mobile device's home network server;
• the home network server is adapted to:
• replace the visitor address placed in the packet's sender address with the home address;
• transmit the packet to the correspondent node;
• receive a response packet as response to the packet transmitted;
• replace the home address placed in the response packet's receiver address with the visitor address,;
• transmit the response packet to the foreign network server;
• the foreign network server is further adapted to:
• replace the visitor address placed in the response packet's receiver address with the care-of address;
• transmit the response packet to the foreign base station;
• the foreign base station is further adapted to:
• replace the care-of address placed in the response packet's receiver address with the home address;
• and,
• transmit the response packet to the mobile device, thus enabling the communication between the mobile device and the correspondent node.