Address resolution method and address resolution communication system

• US 6,847,621 B1
• Filed: 05/23/2000
• Issued: 01/25/2005
• Est. Priority Date: 05/25/1999
• Status: Expired due to Fees

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Asahina, Hiroshi
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): WAHBA, ANDREW W
• Application Number:
  US09/576,294
• Time in Patent Office: 1,708 Days
• Field of Search: 370/331, 370/338, 370/342, 370/398, 370/401, 455/426, 455/432, 455/445
• US Class Current: 370/331
• CPC Class Codes: H04L 61/00 Network arrangements, protocols or services for addressing or naming
• CPC Class Codes: H04L 61/10 of different types
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 80/00 Wireless network protocols or protocol adaptations to wireless operation
• CPC Class Codes: H04W 84/04 Large scale networks; Deep hierarchical networks

Abstract

In an address resolution method for an inter-working function (IWF) for mutually connecting mobile packet terminals (MS) and a radio system accommodating the packet terminals (MS) and a packet network having a switch node, when the packet terminal (MS) is handed over, the packet terminal (MS) transmits a kind of “address resolution protocol (ARP): see Internet Engineering Task Force Document RFC826”, the inter-working function (IWF) transmits the ARP packet to the packet network and the switch node renews an address management table on the basis of the packet received.

Claims

1. An address resolution method for a communication system comprising a plurality of mobile packet terminals, a connection oriented network which accommodates the mobile packet terminals and supplies a connection oriented communication, a connectionless network having a switch node and an inter-working device for mutually connecting the respective networks, comprising the steps of:

receiving data containing a Gratuitous-ARP packet which is of an address resolution protocol (ARP), from one of the mobile packet terminals by way of the inter-working device, in a case when the one mobile packet terminal is handed over to a handover destination on the connection oriented network;

transmitting the packet to the connectionless network by way of the inter-working device;

making the switch node receive the packet by way of the inter-working device;

renewing a physical address management table provided in the switch node on the basis of the content of the packet on the switch node; and

determining another inter-working device at the handover destination of the one mobile packet terminal on the switch node.

2. The address resolution method as claimed in claim 1,

wherein when the handover over the inter-working device is detected, the one mobile packet terminal creates and transmits the IP address of its own mobile packet terminal to a transmission IP address portion of a non-group ARP and a target IP address portion, and creates and transmits to a transmission physical address portion an ARP request message in which a mobile ID of its own mobile packet terminal is set.

3. The address resolution method as claimed in claim 1,

wherein when the handover over the inter-working device is detected, the one mobile packet terminal creates and transmits the IP address of its own mobile packet terminal to a transmission IP address portion of a non-group ARP and a target IP address portion, and creates and transmits to a transmission physical address portion an ARP request message in which the telephone number of its own mobile packet terminal is set.

4. The address resolution method as claimed in claim 1,

wherein the inter-working device uses Ethernet as the connectionless network, and when receiving data containing the ARP request message from the one mobile packet terminal, the inter-working device forms the data to an Ethernet frame as a physical layer of the connectionless network and transmits the Ethernet frame to the connectionless network.

5. The address resolution method as claimed in claim 1, wherein the inter-working device uses as the connection oriented communication system an IS-95 system which is standardized in EIA (Electronic Industries Association)/TIA (Telecommunication Industry Association), ANSI (American National Standard Institute) and CDG (CDMA Development Group).

6. The address resolution method as claimed in claim 2,

wherein when the handover over the inter-working device is detected, the one mobile packet terminal creates and transmits the IP address of its own mobile packet terminal to a transmission IP (Internet Protocol) address portion of a non-group ARP and a target IP address portion, and creates and transmits to a transmission physical address portion an ARP request message in which a telephone number of its own mobile packet terminal is set.

7. The address resolution method as claimed in claim 2,

wherein the inter-working device uses Ethernet as the connectionless network, and when receiving data containing the ARP request message from the one mobile packet terminal, the inter-working device forms the data to an Ethernet frame as a physical layer of the connectionless network and transmits the Ethernet frame to the connectionless network.

8. The address resolution method as claimed in claim 2,

wherein the inter-working device uses as the connection oriented communication system an IS-95 system which is standardized in EIA (Electronic Industries Association)/TIA (Telecommunication Industry Association), ANSI (American National Standard Institute) and CDG (CDMA Development Group).

9. The address resolution method as claimed in claim 3,

wherein the inter-working device uses as the connection oriented communication system an IS-95 system which is standardized in EIA (Electronic Industries Association)/TIA (Telecommunication Industry Association), ANSI (American National Standard Institute) and CDG (CDMA Development Group).

10. An address resolution communication system comprising a plurality of moving mobile packet terminals, a connection oriented network which accommodates the plural mobile packet terminals and supplies a connection oriented communication, a connectionless network having a switch node and an inter-working function for mutually connecting the respective networks to each other, the address resolution communication system comprising:

the inter-working function for receiving data containing a Gratuitous-ARP packet which is of an address resolution protocol (ARP) from one of the mobile packet terminals when the one mobile packet terminal is handed over, and transmitting the Gratuitous-ARP packet to the connectionless network to make the switch node receive the Gratuitous-ARP packet; and

the switch node for renewing a physical address table provided in the switch node on the basis of the content of the Gratuitous ARP packet to specify the interworking function at a handover destination of the mobile packet terminal.

11. The address resolution communication system as claimed in claim 10,

wherein when detecting the handover over the inter-working function, said one mobile packet terminal creates and transmits the IP address of its own mobile packet terminal to a transmission IP address portion and a target IP address portion, and creates and transmits to a transmission physical address portion an ARP request message in which the mobile ID of its own packet terminal is set.

12. The address resolution communication system as claimed in claim 10,

wherein when the handover over the inter-working function is detected, the one mobile packet terminal creates and transmits the IP address of its own mobile packet terminal to a transmission IP address portion of a non-group ARP and a target IP address portion, and creates and transmits to a transmission physical address portion an ARP request message in which a mobile ID of its own mobile packet terminal is set.

13. The address resolution communication system as claimed in claim 10,

wherein when the handover over the inter-working function is detected, the one mobile packet terminal creates and transmits the IP address of its own mobile packet terminal to a transmission IP address portion of a non-group ARP and a target IP address portion, and creates and transmits to a transmission physical address portion an ARP request message in which a telephone number of its own mobile packet terminal is set.

14. The address resolution method as claimed in claim 10,

wherein the inter-working function uses Ethernet as the connectionless network, and when receiving data containing the ARP request message from the one mobile packet terminal, the inter-working function forms the data to an Ethernet frame as a physical layer of the connectionless network and transmits the Ethernet frame to the connectionless network.

15. The address resolution communication system as claimed in claim 10,

wherein the inter-working function uses as the connection oriented communication system an IS-95 system which is standardized in EIA (Electronic Industries Association)/TIA (Telecommunication Industry Association), ANSI (American National Standard Institute) and CDG (CDMA Development Group).