Service discovery system, client terminal, service providing device, and service discovery method

• US 20060047968A1
• Filed: 08/26/2005
• Published: 03/02/2006
• Est. Priority Date: 08/27/2004
• Status: Active Grant

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Inamura, Hiroshi, Nakagawa, Tomohiro, Miyake, Motoharu
• Granted Patent: US 7,627,906 B2
• Time in Patent Office: Days
• US Class Current: 713/176
• CPC Class Codes: G06F 21/55 Detecting local intrusion or implementing counter-measures
• CPC Class Codes: H04L 63/1408 by monitoring network traffic monitoring network traffic per se H04L43/00
• CPC Class Codes: H04L 63/1458 Denial of Service
• CPC Class Codes: H04L 67/01 Protocols
• CPC Class Codes: H04L 67/51 Discovery or management thereof, e.g. service location protocol [SLP] or web services
• CPC Class Codes: H04L 69/329 in the application layer [OSI layer 7]

Abstract

A service discovery system including a client terminal and a service providing device which provides data or a function to the client terminal, including: a service request unit which generates a message requesting a service of the service providing device; a communication unit which sends the message generated by the service request unit to the service providing device and which receives from the service providing device a problem imposing a load on the client terminal; and a solution unit which solves the problem.

Claims

1. A service discovery system including a client terminal and a service providing device which provides data or a function to the client terminal, comprising:

a service request unit which generates a message requesting a service of the service providing device;

a problem management unit which generates a problem imposing a load on the client terminal and which, when a solution to the problem is received from the client terminal, verifies the solution;

a communication unit which sends the message generated by the service request unit to the service providing device and which receives from the service providing device a problem imposing a load on the client terminal;

a solution unit which solves the problem;

a service reply unit which, when the solution to the problem is received, generates a message replying to the service requesting message sent from the client terminal;

a signature unit which adds a digital signature to the message generated by the service reply unit;

a time management unit which measures a length of solution time taken by the client terminal to solve the problem; and

a risk avoidance unit which calculates a risk of the service requesting message, based on a statistic result given by the statistic processing unit.

2. A client terminal which is provided with data or a function from a service providing device, comprising:

a service request unit which generates a message requesting a service of the service providing device;

a communication unit which sends the message generated by the service request unit to the service providing device and which receives from the service providing device a problem imposing a load on the client terminal;

a solution unit which solves the problem;

a time management unit which records a time of reception of the problem from the service providing device and which, when a solution to the problem is sent out, attaches thereto the time of reception of the problem; and

a request retardation unit which, when a length of time from a time of reception of the problem until a solution to the problem is obtained does not reach a given value, waits to send the solution to the service providing device.

3. A service providing device which provides data or a function to a client terminal, comprising:

a problem management unit which generates a problem imposing a load on the client terminal and which, when a solution to the problem is received from the client terminal, verifies the solution;

a communication unit which, when a message requesting a service is received from the client terminal, sends the problem to the client terminal and which receives the solution to the problem from the client terminal;

a service reply unit which, when the solution to the problem is received, generates a message replying to the service requesting message sent from the client terminal;

a signature unit which adds a digital signature to the message generated by the service reply unit;

a time management unit which measures a length of solution time taken by the client terminal to solve the problem; and

a risk avoidance unit which calculates a risk of the service requesting message, based on a statistic result given by the statistic processing unit.

4. The service providing device according to claim 3, further comprising a priority control unit which calculates a priority in accordance with a difficulty of the problem,

wherein the signature unit adds signatures in order according to the priority.

5. The service providing device according to claim 3, further comprising a statistic processing unit which performs statistic processing on each message requesting the service, based on the solution time measured by the time management unit.

6. The service providing device according to claim 3, further comprising a liability formation unit which determines a liability, based on a length of time for which the client terminal used the service providing device,

wherein the risk avoidance unit calculates the risk, based on the statistic result given by the statistic processing unit and the liability.

7. In a system including a client terminal and a service providing device which provides data or a function to the client terminal, a service discovery method for discovering the service providing device, comprising:

by the client terminal, generating a message requesting a service of the service providing device;

by the service providing device, generating a problem imposing a load on the client terminal;

by the service providing device, sending the problem to the client terminal when the service requesting message is received from the client terminal;

by the client terminal, solving the problem;

by the service providing device, verifying a solution to the problem when the solution is received from the client terminal;

by the service providing device, upon the verification of the solution to the problem, generating a message replying to the service requesting message sent from the client terminal;

by the service providing device, adding a digital signature to the replying message; and

by the client terminal, waiting to send the solution to the service providing device when a length of time from a time of reception of the problem until the solution to the problem is obtained does not reach a given value.

9. The service discovery method according to claim 7, further comprising:

by the service providing device,

measuring a length of solution time taken by the client terminal to solve the problem;

performing statistic processing on each message requesting the service, based on the solution time measured;

determining a liability, based on a length of time for which the client terminal used the service providing device;

calculating a risk of the service requesting message, based on a result of the statistic processing and the liability; and

calculating a priority, based on a difficulty of the problem and the risk,

wherein in the step of adding the digital signature, digital signatures are added in order according to the priority.

8. In a system including a client terminal and a service providing device which provides data or a function to the client terminal, a service discovery method for discovering the service providing device, comprising:

by the client terminal, generating a message requesting a service of the service providing device;

by the service providing device, generating a problem imposing a load on the client terminal;

by the service providing device, sending the problem to the client terminal when the service requesting message is received from the client terminal;

by the client terminal, solving the problem;

by the service providing device, verifying a solution to the problem when the solution is received from the client terminal;

by the service providing device, upon the verification of the solution to the problem, generating a message replying to the service requesting message sent from the client terminal;

by the service providing device, adding a digital signature to the replying message; and

by the service providing device,

measuring a length of solution time taken by the client terminal to solve the problem;

performing statistic processing on each message requesting the service, based on the solution time measured;

determining a liability, based on a length of time for which the client terminal used the service providing device;

calculating a risk of the service requesting message, based on a result of the statistic processing and the liability; and

calculating a priority, based on a difficulty of the problem and the risk,

wherein in the step of adding the digital signature, digital signatures are added in order according to the priority.