Load balancing network access requests

• US 7,447,774 B2
• Filed: 01/26/2007
• Issued: 11/04/2008
• Est. Priority Date: 08/27/2002
• Status: Expired due to Term

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Iyer, Jayaraman R., Centemeri, Marco C., Andriantsiferana, Laurent, Viswanath, Kaartik, Tsao, Wen-Lin
• Primary Examiner(s): Etienne; Ario
• Assistant Examiner(s): Nano; Sargon N
• Application Number:
  US11/627,415
• Publication Number:
  US 20070118670A1
• Time in Patent Office: 648 Days
• Field of Search: 709/217, 709/219, 709/226, 709/238, 718/105, 455/434, 455/445, 455/453
• US Class Current: 709/225
• CPC Class Codes: H04W 28/088 among core entities
• CPC Class Codes: H04W 88/16 Gateway arrangements

Abstract

A method of load balancing network access requests comprises receiving a network access request from a serving node linked to a radio access network. The network access request identifies a mobile node receiving wireless service from the radio access network and identifies a data network to which the mobile node has requested access. The network access request requests a communication channel with the serving node for transporting data communications between the mobile node and the data network. The method further comprising determining one or more gateways providing access to the data network, selecting one of the gateways, and forwarding the network access request to the selected gateway.

Claims

1. An operator network providing access between a radio access network and a plurality of data networks, the operator network comprising:

a first domain name server configured to return an internet protocol (IP) address for a load balance unit in response to domain name requests identifying any one of a plurality of data networks;

a second domain name server configured to return IP addresses for one or more gateways serving a data network identified in a domain name request;

a serving node operable to receive a request from a mobile node for access to a selected one of the data networks, to communicate a domain name request identifying the selected data network to the first domain name server, to receive a response from the first domain name server identifying the IP address for the load balance unit, the network access request identifying the mobile node and the selected data network;

the load balance unit operable to maintaining mapping information for previously processed network access requests to receive the network access request to communicate a domain name request identifying the selected data network to the second domain name server, to receive a response from the second domain name server identifying IP addresses for the one or more gateways serving the selected data network, to use the mapping information to select one of the gateways providing access to the data network, and forward the request to the selected gateway.

2. The operator network of claim 1, wherein the load balance unit comprises a processor, the processor operable to select one of the gateways by selecting the first IP address in the list, such that rotating positions of the addresses in subsequent domain name requests balances subsequent network access requests between the one or more gateways.

3. The operator network of claim 1, wherein the network access request comprising an internet protocol (IP) packet having a source address for the serving node and a destination address indicating a load balance unit address configured within a public domain name server used by the serving node, the processor further operable to modify the destination address to indicate an IP address for the selected gateway.

4. The operator network of claim 1, wherein the network access request is a create packet data protocol (PDP) context request generated by the serving node in response to a request generated by the mobile node, the create PDP context request comprising an access point name field indicating the data network, a mobile node identifier identifying the mobile node, an authentication method for use by the selected gateway, a user identifier identifying a users of the mobile node requesting the communication channel, and a password for the user of the mobile node.

5. The operator network of claim 1, wherein the mapping information indicates, for each of the previously processed network access requests, a mobile node associated with the previously processed network access request and an internet protocol (IP) address for a gateway selected for receiving the previously processed network access request.

6. The operator network of claim 5, wherein the mapping information further indicates a time stamp for each of the previously processed network access requests, the processor further operable to remove expired entries from the mapping information based upon the time stamps.

7. The operator network of claim 1, wherein the processor is further operable to:

determine whether the mapping information includes an entry for the mobile node indicated in the network access request;

if the mapping information does not include the entry for the mobile node, perform the steps of determining the one or more gateways providing access to the data network and select one of the gateways; and

if the mapping information does include the entry for the mobile node, modifying a destination address of the network access request to indicate the IP address of the gateway selected to receive the previously processed network access request indicating the mobile node.

8. The operator network of claim 1, wherein the serving node comprises a serving generalized packet radio service (GPRS) support node communicating with the first interface, the mobile node operable to use GPRS protocols to access the data network, the gateways comprising gateway GPRS support nodes, and the communication channel comprising a GPRS tunneling protocol tunnel.