Traffic monitoring system and service differentiation in a dynamic channel assignment system for TCP/IP data transmitted via cable television channels

• US 6,498,783 B1
• Filed: 06/22/1999
• Issued: 12/24/2002
• Est. Priority Date: 06/22/1999
• Status: Expired due to Fees

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Lin, Reitseng
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): George, Keith M.
• Application Number:
  US09/338,038
• Time in Patent Office: 1,281 Days
• Field of Search: 370/252, 370/253, 370/248, 370/249, 370/242, 725/107, 725/95, 348/192, 348/180
• US Class Current: 370/252
• CPC Class Codes: H04L 41/5022 by giving priorities, e.g. assigning classes of service
• CPC Class Codes: H04L 43/50 Testing arrangements

Abstract

This invention relates to a method for computing the average data transmission rate available in each channel in a data communication, TCP/IP system that utilizes in part cable television channels as the transmission media. The method employs a bandwidth manager and a test personal computer, both of which are connected to the cable channel system to determine the average bit rate through any channel in the system. By utilizing computers connected to the cable system to make bit rate measurements, the problems associated with having a low speed telephone link that dominates the measurement is avoided. The method to measure the bit rate in a channel includes sending a test message of fixed length from the bandwidth manager to the personal computer via a chosen channel with a timestamp and computing the data transmission rate in the chosen channel by dividing the number of bits in the test message by the difference in time between when the test message is received by the personal computer and the timestamp placed on the test message by the bandwidth manager. Average data transmission rates via the chosen channel are computed by averaging multiple measurements of the data transmission rate through the chosen channel. Once the data transmission rates are determined for all channels in the system, different classes of service through different channels can be provided.

Claims

1. In a data communication system with cable television channels, a method for determining the data transmission rate in a channel comprising:

providing a bandwidth manager for the data communication system;

connecting a personal computer to the system, said computer being capable of communicating with a number of channels in the system;

sending a test message of fixed length from the bandwidth manager to the personal computer via a chosen channel with a timestamp; and

computing the data transmission rate in the chosen channel by dividing the number of bits in the test message by the difference in time between when the test message is received by the personal computer and the timestamp placed on the test message by the bandwidth manager.

2. The method of claim 1 further comprising assigning another channel through the bandwidth manager to the personal computer for making measurements of the data transmission rate.

3. The method of claim 1 further comprising the initial step of synchronizing time clocks on both the bandwidth manager and the personal computer, said synchronizing step being preferably performed in light traffic conditions.

4. The method of claim 1 further comprising measuring the average data transmission rate via the chosen channel by averaging multiple measurements of the data transmission rate through the chosen channel.

5. The method of claim 1 further comprising storing the data transmission rate through the chosen channel in a database in the bandwidth manager and permitting other computers in the system to access this database to display the data transmission rates through different channels in the system.

6. The method of claim 1 further comprising the step of providing different classes of service through different channels based on their respective data transmission rates.

7. The method of claim 1 further comprising the step of granting a new session to a user if the measured data transmission rate through the user'"'"'s channel exceeds the bandwidth allocated to the channel and the total number of active sessions is less than the number of sessions permitted by the system.

8. The method of claim 1 further comprising the step of switching users from higher data transmission rate channels to lower data transmission rate channels or vice versa to better accommodate additional users.

9. In a data communication system with cable television channels, a method for determining the data transmission rate through multiple channels comprising:

(a) providing a bandwidth manager for the data communication system;

(b) connecting a personal computer to the system, said computer being capable of communicating with a number of channels in the system;

(c) synchronizing time clocks on both the bandwidth manager and the personal computer;

(d) sending a test message of fixed length from the bandwidth manager to the personal computer via a chosen channel with a timestamp;

(e) computing the data transmission rate in the chosen channel by dividing the number of bits in the test message by the difference in time between when the test message is received by the personal computer and the timestamp placed on the test message by the bandwidth manager;

(f) assigning a new channel through the bandwidth manager to the personal computer in order to measure the data transmission rate through the new channel; and

(g) repeating steps (d) through (f) until data transmission rate measurements are completed for all channels.

10. The method of claim 9 further comprising measuring the average data transmission rate via the chosen channel by averaging multiple measurements of the data transmission rate through the chosen channel.

11. The method of claim 9 further comprising storing the data transmission rate through the chosen channel in a database in the bandwidth manager and permitting other computers in the system to access this database to display the data transmission rates through different channels in the system.

12. The method of claim 9 further comprising the step of providing different classes of service through different channels based on their respective data transmission rates.

13. The method of claim 9 further comprising the step of granting a new session to a user if the measured data transmission rate through the user'"'"'s channel exceeds the bandwidth allocated to the channel and the total number of active sessions is less than the number of sessions permitted by the system.

14. The method of claim 9 further comprising the step of switching users from higher data transmission rate channels to lower data transmission rate channels or vice versa to better accommodate additional users.

15. In a data communication system with cable television channels, a method for determining the data transmission rate through multiple channels and providing different classes of service through the multiple channels comprising:

(a) providing a bandwidth manager for the data communication system;

(b) connecting a personal computer to the system, said computer being capable of communicating with a number of channels in the system;

(c) synchronizing time clocks on both the bandwidth manager and the personal computer;

(d) sending a test message of fixed length from the bandwidth manager to the personal computer via a chosen channel with a timestamp;

(e) computing the data transmission rate in the chosen channel by dividing the number of bits in the test message by the difference in time between when the test message is received by the personal computer and the timestamp in the test message;

(f) assigning a new channel through the bandwidth manager to the personal computer in order to measure the data transmission rate through the new channel;

(g) repeating steps (d) through (f) until data transmission rate measurements are completed for all channels; and

(h) providing different classes of service through different channels based on their respective data transmission rates.

16. The method of claim 15 further comprising the step of granting a new session to a user if the measured data transmission rate through the user'"'"'s channel exceeds the bandwidth allocated to the channel and the total number of active sessions is less than the number of sessions permitted by the system.

17. The method of claim 15 further comprising the step of switching users from higher data transmission rate channels to lower data transmission rate channels or vice versa to better accommodate additional users.