QoS-aware path switching for VoIP traffic using SCTP

  • Authors:

  • Lin-Huang Chang;Tsung-Han Lee;Hung-Chi Chu;Yu-Lung Lo;Yu-Jen Chen

  • Affiliations:

  • Department of Computer and Information Science, National Taichung University, Taichung, Taiwan;Department of Computer and Information Science, National Taichung University, Taichung, Taiwan;Department of Information and Communication Engineering, Chaoyang University of Technology, Taichung, Taiwan;Department of Information Management, Chaoyang University of Technology, Taichung, Taiwan;Research and Development Division, ASUSTek Computer Inc., Taipei, Taiwan

  • Venue:
  • Computer Standards & Interfaces
  • Year:
  • 2013

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Abstract

Voice over Internet protocol (VoIP) has been a prevalent multimedia service nowadays. It allows us to transmit voice data over IP networks. However, quality of service (QoS) is a major challenge to VoIP services. It must provide similar quality to traditional public switched telephone network or cellular phone services. Therefore, QoS related protocols have become important for real-time applications. Multi-protocol label switch (MPLS) is one of the important techniques to improve the network performance from QoS point of view. It employs label swapping to speed up packet forwarding. However, when a large number of users utilize VoIP services, the network congestion issue still exists. It causes delay, jitter and packet loss that affect VoIP QoS. In this paper, we propose a QoS-aware path switching strategy by using stream control transmission protocol (SCTP) in MPLS network to improve the VoIP traffic. This was done by employing SCTP selective acknowledgment mechanism to report the transmission parameters of primary path and to determine the criteria to switch to backup path. Simulation results show significant improvement in VoIP QoS.