Bandwidth allocation for VoIP traffic in network having interface between frame relay and ATM

• US 20060182024A1
• Filed: 02/14/2005
• Published: 08/17/2006
• Est. Priority Date: 02/14/2005
• Status: Active Grant

• Current Assignee: SBC Knowledge Ventures LP (AT&T, Inc.)
• Original Assignee: SBC Knowledge Ventures LP (AT&T, Inc.)
• Inventors: Zhao, Yongdong, Soon, Shih-Chung, Tan, Teong Yee, Chen, Wengo
• Granted Patent: US 7,586,923 B2
• Time in Patent Office: Days
• US Class Current: 370/229
• CPC Class Codes: H04L 1/0014 by adapting the source coding
• CPC Class Codes: H04L 2012/647 Frame Relay, X.25
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/65 Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
• CPC Class Codes: H04L 65/70 Media network packetisation

Abstract

A frame relay data rate R_FR for a VoIP call is determined based on a particular packetization time interval T_S and its associated sample data size B_S for a particular CODEC, a size B_HT of at least one of a frame relay header and a frame relay trailer, and a size B_IP of an IP header. A number of VoIP calls NUM_VOIP that can be supported by a frame relay access link is determined based on a bandwidth of the frame relay access link that is to be allocated to VoIP traffic, and the frame relay data rate R_FR. At least one network parameter is determined based on NUM_VOIP. Bandwidth in an asynchronous transfer mode (ATM) network is allocated for the VoIP traffic based on the at least one network parameter.

Claims

1. A method comprising:

determining a frame relay data rate R_FR for a Voice over Internet Protocol (VoIP) call based on a packetization time interval T_S and its associated sample data size B_S for a particular coder-decoder (CODEC), a size B_HT of at least one of a frame relay header and a frame relay trailer, and a size B_IP of at least one header in an IP packet for the VoIP call;

determining a number of VoIP calls NUM_VOIP that can be supported by a frame relay access link based on a bandwidth of the frame relay access link that is to be allocated to VoIP traffic and the frame relay data rate R_FR;

determining at least one network parameter based on NUM_VOIP; and

allocating bandwidth in an asynchronous transfer mode (ATM) network for the VoIP traffic based on the at least one network parameter.

2. The method of claim 1 wherein the bandwidth of the frame relay access link that is to be allocated to VoIP traffic is a product of a bandwidth B_FR of the frame relay access link and a predetermined fraction R_P of the frame relay bandwidth that is to be allocated to VoIP traffic.

3. The method of claim 1 wherein NUM_VOIP=floor[R_P*B_FR/R_FR], wherein B_FR is a bandwidth of the frame relay access link and R_P is a predetermined fraction of the frame relay bandwidth that is to be allocated to VoIP traffic.

4. The method of claim 1 wherein R_FR is based on (B_HT+B_IP+B_S)/T_S.

5. The method of claim 1 wherein the at least one network parameter comprises a sustained cell rate (SCR) based on NUM_VOIP.

6. The method of claim 5 wherein SCR is further based on an ATM data rate R_ATM for the VoIP call.

7. The method of claim 6 wherein SCR=NUM_VOIP*R_ATM+(B_FR−

NUM_VOIP*R_FR)*k, wherein k is a constant.

8. The method of claim 7 wherein k=53/48.

9. The method of claim 1 wherein the at least one network parameter comprises a maximum burst rate (MBS) based on NUM_VOIP.

10. The method of claim 1 further comprising:

determining at least one layer-3 parameter based on NUM_VOIP; and

monitoring the VoIP traffic based on the at least one layer-3 parameter.

11. The method of claim 10 wherein the at least one layer-3 parameter comprises a committed information rate (CIR), the CIR based on a product of NUM_VOIP and an Internet Protocol data rate R_IP for the VoIP call.

12. The method of claim 10 wherein the at least one layer-3 parameter comprises a committed burst size (Bc), wherein Bc is proportional to NUM_VOIP.

13. The method of claim 1 wherein the size B_IP of the at least one header in the IP packet for the VoIP call is a combined size of a real-time protocol (RTP) header, a user datagram protocol (UDP) header, and an IP header.

14. A computer-readable medium having computer-readable program code to cause a computer system to:

determine a frame relay data rate R_FR for a Voice over Internet Protocol (VoIP) call based on a packetization time interval T_S and its associated sample data size B_S for a particular coder-decoder (CODEC), a size B_HT of at least one of a frame relay header and a frame relay trailer, and a size B_IP of at least one header in an IP packet for the VoIP call;

determine a number of VoIP calls NUM_VOIP that can be supported by a frame relay access link based on a bandwidth of the frame relay access link that is to be allocated to VoIP traffic and the frame relay data rate R_FR;

determine at least one network parameter based on NUM_VOIP; and

allocate bandwidth in an asynchronous transfer mode (ATM) network for the VoIP traffic based on the at least one network parameter.

15. The computer-readable medium of claim 14 wherein the bandwidth of the frame relay access link that is to be allocated to VoIP traffic is a product of a bandwidth B_FR of the frame relay access link and a predetermined fraction R_P of the frame relay bandwidth that is to be allocated to VoIP traffic.

16. The computer-readable medium of claim 14 wherein NUM_VOIP=floor[R_P*B_FR/R_FR], wherein B_FR is a bandwidth of the frame relay access link and R_P is a predetermined fraction of the frame relay bandwidth that is to be allocated to VoIP traffic.

17. The computer-readable medium of claim 14 wherein R_FR is based on (B_HT+B_IP+B_S)/T_S.

18. The computer-readable medium of claim 14 wherein the at least one network parameter comprises a sustained cell rate (SCR) based on NUM_VOIP.

19. The computer-readable medium of claim 18 wherein SCR is further based on an ATM data rate R_ATM for the VoIP call.

20. The computer-readable medium of claim 19 wherein SCR=NUM_VOIP*R_ATM+(B_FR−

NUM_VOIP*R_FR)*k, wherein k is a constant.

21. The computer-readable medium of claim 20 wherein k=53/48.

22. The computer-readable medium of claim 14 wherein the at least one network parameter comprises a maximum burst rate (MBS) based on NUM_VOIP.

23. The computer-readable medium of claim 14 wherein the computer-readable program code further causes the computer system to:

determine at least one layer-3 parameter based on NUM_VOIP; and

monitor the VoIP traffic based on the at least one layer-3 parameter.

24. The computer-readable medium of claim 23 wherein the at least one layer-3 parameter comprises a committed information rate (CIR), the CIR based on a product of NUM_VOIP and an Internet Protocol data rate R_IP for the VoIP call.

25. The computer-readable medium of claim 23 wherein the at least one layer-3 parameter comprises a committed burst size (Bc), wherein Bc is proportional to NUM_VOIP.

26. The computer-readable medium of claim 14 wherein the size B_IP of the at least one header in the IP packet for the VoIP call is a combined size of a real-time protocol (RTP) header, a user datagram protocol (UDP) header, and an IP header.