Information-processing device, information-processing method, and information-processing program product

• US 20050286437A1
• Filed: 12/23/2004
• Published: 12/29/2005
• Est. Priority Date: 06/25/2004
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Isozaki, Hiroshi, Matsushita, Tatsuyuki
• Granted Patent: US 7,535,852 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 63/0435 wherein the sending and receiving network entities apply symmetric encryption, i.e. same key used for encryption and decryption cryptographic mechanisms or cryptographic arrangements for symmetric key encryption H04L9/06
• CPC Class Codes: H04L 63/061 for key exchange, e.g. in peer-to-peer networks cryptographic mechanisms or cryptographic arrangements for key agreement H04L9/0838

Abstract

An information-processing device for communicating with a communication device includes a RTT measurement unit configured to measure a round trip time between the information-processing device and the communication device, a RTT judgment unit configured to determine whether the round trip time exceeds a predetermined upper limit value, a unit-type information acquiring unit configured to acquire an identification of the communication device when the round trip time is not greater than the upper limit value, a limit value judgment unit configured to measure amount of cumulative information accumulated during content is transmitted to the communication device, a cumulative information storage unit configured to store the measured amount of cumulative information, and a cumulative information management unit configured to control to store the cumulative information in the cumulative information storage unit when the amount of cumulative information exceeds a given limit value.

Claims

1. An information-processing device for communicating with a communication device, comprising:

a RTT measurement unit configured to measure a round trip time between the information-processing device and the communication device;

a RTT judgment unit configured to determine whether the round trip time exceeds a predetermined upper limit value;

a unit-type information acquiring unit configured to acquire an identification of the communication device when the round trip time is not greater than the upper limit value;

a limit value judgment unit configured to measure amount of cumulative information accumulated during content is transmitted to the communication device;

a cumulative information storage unit configured to store the measured amount of cumulative information; and

a cumulative information management unit configured to control to store the cumulative information in the cumulative information storage unit when the amount of cumulative information exceeds a given limit value.

2. The information-processing device of claim 1, wherein the cumulative information includes at least one of cumulative time, cumulative data amount of the content, and a frequency of events occurring during transmission of the content.

3. The information-processing device of claim 1, wherein the RTT measurement unit is configured to re-measure the round trip time when the round trip time exceeds the upper limit value.

4. The information-processing device of claim 3, wherein the cumulative information management unit is configured to reset the amount of cumulative information when the re-measured round trip time is not greater than the upper limit value.

5. The information-processing device of claim 1, further comprising:

a write frequency controller configured to determine a frequency of writing cumulative information to the cumulative information storage unit based on a bit rate of content to be transmitted to the communication device, a durable write frequency of the cumulative information storage unit, an expected lifetime of the cumulative information storage unit, a number of communication devices receiving content at the same time, and a frequency of measuring the cumulative information, wherein

the cumulative information management unit stores the cumulative information in the cumulative information storage unit at the frequency of writing cumulative information.

6. The information-processing device of claim 5, wherein the write frequency controller is configured to determine the frequency of writing cumulative information based on

F=Const.×

LRS/(DW)

wherein F is the frequency of writing cumulative information, Const. is a constant number, L is the expected lifetime of the cumulative information storage unit, R is the bit rate of content to be transmitted to the communication device, S is the number of communication devices receiving content at the same time from the information-processing device, D is the frequency of measuring the cumulative information, and W is the durable write frequency of the cumulative information storage unit.

7. The information-processing device of claim 1, further comprising:

a re-measurement frequency controller configured to determine a frequency of re-measuring the round trip time based on the amount of cumulative information, a frequency of measuring the cumulative information, an average number of measuring the round trip time before obtaining the round trip time not greater than the upper limit value, and a bit rate of content to be transmitted to the communication device, wherein

the RTT measurement unit is configured to re-measure the round trip time at the frequency of re-measuring the round trip time.

8. The information-processing device of claim 7, wherein the re-measurement frequency controller is configured to determine the frequency of re-measuring the round trip time based on

G=CD/(QR)

wherein G is the frequency of re-measuring the round trip time, C is the amount of cumulative information, D is the frequency of measuring the cumulative information, Q is the average number of measuring the round trip time before obtaining the round trip time not greater than the upper limit value, and R is the bit rate of content to be transmitted to the communication device.

9. An information-processing program product for communicating with a communication device, comprising:

instructions for measuring a round trip time between the information-processing device and the communication device;

instructions for determining whether the round trip time exceeds a predetermined upper limit value;

instructions for acquiring an identification of the communication device when the round trip time is not greater than the upper limit value;

instructions for measuring amount of cumulative information accumulated during content is transmitted to the communication device;

instructions for storing the measured amount of cumulative information; and

instructions for controlling to store the cumulative information when the amount of cumulative information exceeds a given limit value.

10. The information-processing program product of claim 9, wherein the cumulative information includes at least one of cumulative time, cumulative data amount of the content, and a frequency of events occurring during transmission of the content.

11. The information-processing program product of claim 9, further comprising instructions for re-measuring the round trip time when the round trip time exceeds the upper limit value.

12. The information-processing program product of claim 11, further comprising instructions for resetting the amount of cumulative information when the re-measured round trip time is not greater than the upper limit value.

13. The information-processing program product of claim 9, further comprising:

instructions for determining a frequency of writing cumulative information to a cumulative information storage unit based on a bit rate of content to be transmitted to the communication device, a durable write frequency of the cumulative information storage unit, an expected lifetime of the cumulative information storage unit, a number of communication devices receiving content at the same time, and a frequency of measuring the cumulative information; and

instructions for storing the cumulative information in the cumulative information storage unit at the frequency of writing cumulative information.

14. The information-processing program product of claim 13, wherein the frequency of writing cumulative information is determined based on

F=Const.×

LRS/(DW)

wherein F is the frequency of writing cumulative information, Const. is a constant number, L is the expected lifetime of the cumulative information storage unit, R is the bit rate of content to be transmitted to the communication device, S is the number of communication devices receiving content at the same time from the information-processing device, D is the frequency of measuring the cumulative information, and W is the durable write frequency of the cumulative information storage unit.

15. The information-processing program product of claim 9, further comprising:

instructions for determining a frequency of re-measuring the round trip time based on the amount of cumulative information, a frequency of measuring the cumulative information, an average number of measuring the round trip time before obtaining the round trip time not greater than the upper limit value, and a bit rate of content to be transmitted to the communication device; and

instructions for re-measuring the round trip time at the frequency of re-measuring the round trip time.

16. The information-processing program product of claim 15, wherein the frequency of re-measuring the round trip time is determined based on

G=CD/(QR)

wherein G is the frequency of re-measuring the round trip time, C is the amount of cumulative information, D is the frequency of measuring the cumulative information, Q is the average number of measuring the round trip time before obtaining the round trip time not greater than the upper limit value, and R is the bit rate of content to be transmitted to the communication device.

17. An information-processing method for communicating with a communication device, comprising:

measuring a round trip time between the information-processing device and the communication device;

determining whether the round trip time exceeds a predetermined upper limit value;

acquiring an identification of the communication device when the round trip time is not greater than the upper limit value;

measuring amount of cumulative information accumulated during content is transmitted to the communication device;

storing the measured amount of cumulative information; and

controlling to store the cumulative information when the amount of cumulative information exceeds a given limit value.