Communication apparatus with selective route optimization capabilities

• US 20020015386A1
• Filed: 03/22/2001
• Published: 02/07/2002
• Est. Priority Date: 08/02/2000
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kajiwara, Yasuhiro
• Granted Patent: US 6,922,394 B2
• Time in Patent Office: Days
• US Class Current: 370/248
• CPC Class Codes: H04L 2012/562 Routing
• CPC Class Codes: H04L 45/10 Routing in connection-oriented networks, e.g. X.25 or ATM
• CPC Class Codes: H04L 45/22 Alternate routing
• CPC Class Codes: H04L 45/44 Distributed routing
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

A communication apparatus which effectively optimizes the route for each call connection without causing any adverse effect on other existing sessions and thus contributes to better quality and reliability of telecommunications services. A source-side routing data manager collects information necessary for path calculation, evaluates every possible path with the collected information, and manages routing data that is obtained through the path evaluation. A source-side best path finder selects a best path from among those listed in the routing data. A connection releasing unit releases a particular connection when the source-side best path finder has found a new best path that is more suitable for that particular connection than the current path, while maintaining the connectivity of other existing calls. A new best path setting unit performs a call connection procedure by using the newly selected best path, after the connection releasing unit has released the current connection.

Claims

1. A source-side communication apparatus which selects a best path suitable for routing a call, comprising:

source-side routing data management means for collecting information necessary for path calculation, evaluating possible paths with the collected information, and managing routing data that is obtained through the path evaluation;

source-side best path finding means for finding a best path from among those listed in the routing data;

connection releasing means for releasing a particular connection when said source-side best path finding means has found a new best path that is more suitable for the particular connection than a path being currently used, while maintaining the connectivity of other existing calls; and

new best path setting means for performing a call connection procedure by using the new best path, after said connection releasing means has released the current connection.

2. The communication apparatus according to claim 1, wherein said connection releasing means releases connections on an individual connection basis, or on an individual port basis.

3. The communication apparatus according to claim 1, wherein said new best path setting means sets up a connection over the new best path, while masking particular existing connections.

4. A destination-side communication apparatus which selects a best path suitable for routing a call, comprising:

destination-side routing data management means for collecting information necessary for path calculation, evaluating possible paths with the collected information, and managing routing data that is obtained through the path evaluation;

destination-side best path finding means for finding a best path from among those listed in the routing data;

connection release requesting means for sending a connection release request for a particular connection when said destination-side best path finding means has found a new best path that is more suitable for the particular connection than a path being currently used, while maintaining the connectivity of other existing calls.

5. The communication apparatus according to claim 4, wherein said connection release requesting means requests releasing of connections on an individual connection basis, or on an individual port basis.

6. A communications system which selects a best path suitable for routing a call, comprising:

(a) a source-side communication apparatus comprising;

source-side routing data management means for collecting information necessary for path calculation, evaluating possible paths with the collected information, and managing routing data that is obtained through the path evaluation,

source-side best path finding means for finding a best path from among those listed in the routing data,

connection releasing means for releasing a particular connection when said source-side best path finding means has found a new best path that is more suitable for the particular connection than a path being currently used, while maintaining the connectivity of other existing calls, and

new best path setting means for performing a call connection procedure by using the new best path, after said connection releasing means has released the current connection; and

(b) a destination-side communication apparatus comprising;

destination-side routing data management means for collecting information necessary for path calculation, evaluating possible paths with the collected information, and managing routing data that is obtained through the path evaluation,

destination-side best path finding means for finding a best path from among those listed in the routing data, and

connection release requesting means for sending a connection release request for a particular connection when said destination-side best path finding means has found a new best path that is more suitable for the particular connection than a path being currently used, while maintaining the connectivity of other existing calls.

7. The communications system according to claim 6, wherein said connection releasing means releases connections on an individual connection basis, or on an individual port basis.

8. The communications system according to claim 6, wherein said connection release requesting means requests releasing of connections on an individual connection basis, or on an individual port basis.

9. The communications system according to claim 6, wherein said new best path setting means sets up a connection over the new best path, while masking particular existing connections.