LOAD BALANCE SERVER AND METHOD FOR BALANCING LOAD OF PRESENCE INFORMATION

• US 20090010163A1
• Filed: 06/19/2008
• Published: 01/08/2009
• Est. Priority Date: 07/03/2007
• Status: Active Grant

• Current Assignee: KDDI R&D Laboratories Inc. (KDDI Corporation)
• Original Assignee: KDDI R&D Laboratories Inc. (KDDI Corporation)
• Inventors: TASAKA, Kazuyuki, IMAI, Naoki, ISOMURA, Manabu, IDOUE, Akira
• Granted Patent: US 7,885,191 B2
• Time in Patent Office: Days
• US Class Current: 370/235
• CPC Class Codes: H04L 47/125 by balancing the load, e.g. traffic engineering
• CPC Class Codes: H04W 60/00 Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
• CPC Class Codes: H04W 8/26 Network addressing or numbering for mobility support
• CPC Class Codes: H04W 84/04 Large scale networks; Deep hierarchical networks

Abstract

A load balance server has a first database for recording a list of identifiers of the presence servers, a second database for recording a subscription message receiving rate, an entry retrieval means for selecting a presence server that the subscription message receiving rate is lowest, in presence servers included in the list of the entry based on the presence information, a presence server selecting means for selecting an additional presence server whichever subscription message receiving rate is lower than predetermined threshold Ts, when the subscription message receiving rate in the selected presence server is higher than predetermined threshold Ts, and a message sending/receiving control means for sending the public message to the selected presence server.

Claims

1. A load balance server for communicating with first communication apparatus, second communication apparatus and a plurality of presence servers,

the first communication apparatus sends a public message to register presence information,

the second communication apparatus sends a subscription message subscribing presence information,

the presence server registers presence information included in the received public message, and sends a report message including the presence information to the source apparatus of the received subscription message, wherein said load balance server comprising:

a first database for recording a list of identifiers of the presence servers that register the presence information with an entry,

a second database for recording a subscription message receiving rate for each presence server,

an entry retrieval means for selecting a presence server that the subscription message receiving rate is lowest, in presence servers included in the list of the entry based on the presence information, when the subscription message or the public message is received,

a presence server selecting means for selecting an additional presence server whichever subscription message receiving rate is lower than predetermined threshold Ts, when the subscription message receiving rate in the selected presence server is higher than predetermined threshold Ts, and

a message sending/receiving control means for sending the public message to the selected presence server.

2. The load balance server as claimed in claim 1, wherein

the server is equipped in a presence system using SIP/SIMPLE,

the public message is PUBLISH message,

the subscription message is SUBSCRIBE message,

the report message is NOTIFY message,

the first database is publish database, and

the second database is subscribe database.

3. The load balance server as claimed in claim 1, wherein the presence server selecting means for

selecting whichever presence server from a plurality of presence servers, by the hash function that an argument is a part of the presence information,

determining whether a subscription message receiving rate of the selected presence server is lower than predetermined threshold Ts, and

repeating the selecting of the presence server until the determination becomes the truth.

4. The load balance server as claimed in claim 1, when the subscription message is sent from the second communication apparatus to the presence server, the message sending/receiving control means sends back a re-direct request including the address of the presence server to the second communication apparatus, sends a subscription message to the presence server by using DSR method, or sends a subscription message to the presence server by using NAT method.

5. The load balance server as claimed in claim 1, when the subscription message is received, and correspondingly a public message is sent to the additional presence server, the message sending/receiving control means sends the subscription message to either one presence server included in a list of entry based on the presence information, receives presence information from the presence server by the report message, and sends the public message including the presence information to the additional presence server.

6. The load balance server as claimed in claim 1, when the public message is received, and correspondingly a public message is sent to the additional presence server, the message sending/receiving control means sends public message to all presence servers included in a list of the entry based on the presence information, and sends public message to the additional presence server.

7. The load balance server as claimed in claim 1, wherein

the second database further includes effective period in each presence information, and

the entry retrieval means deletes presence servers from the list of the entry, and the presence servers is that the effective period of the subscription message stored in the second database expires for current time.

8. A method for making a computer to function as a load balance server for communicating with first communication apparatus, second communication apparatus and a plurality of presence servers,

the first communication apparatus sends a public message to register presence information,

the second communication apparatus sends a subscription message subscribing presence information,

the presence server registers presence information included in the received public message, and sends a report message including the presence information to the source apparatus of the received subscription message,

the load balance server has a first database for recording a list of identifiers of the presence servers that registered the presence information with an entry, and a second database for recording a subscription message receiving rate for each presence server, wherein the method comprising the steps of:

selecting a presence server that the subscription message receiving rate is lowest, in presence servers included in the list of the entry based on the presence information, when the subscription message or the public message is received,

selecting an additional presence server whichever subscription message receiving rate is lower than predetermined threshold Ts, when the subscription message receiving rate in the selected presence server is higher than predetermined threshold Ts, and

sending the public message to the selected presence server.