QoS Traffic Policing

QoS Traffic Policing is one of the most important functions of Stingray Service Gateway. High quality is achieved by the ability of DPI technology to divide all traffic by priorities, providing wider bandwidth to certain applications and protocols.

QoS is mostly applied in IP telephony, IPTV, video conferencing and other services sensitive to traffic delays.

Availability and high quality of service are the main indicators of the provider’s good work. Stuttering sound, video with colour squares, slow downloading of pages is what annoys the end users the most. These factors can be improved by managing QoE (Quality of Experience) with the QoS function of the Stingray platform.

What tasks does QoS solve

Prioritizes and differentiates traffic

Ensures even traffic

Prevents network overload

Guarantees quality and rate of access to the Internet

Specifics

Hierarchy of Prioritization

To ensure Quality of Service (QoS), Stingray SG allows to prioritize traffic at all stages of its delivery to the user:

  • by common channel
  • by the subscriber’s tariff
  • by VLAN and ports if there are several UPLINKS (channels to upline provider) and need for balancing.

Traffic Mapping by Changing the Priority Field

To ensure the required QoS on the router or shaper, Stingray SG changes the priority field of the packets passing through it after defining a protocol or an autonomous system. The following fields are supported:

  • DSCP/TOS in the headline of IP packets
  • priority in VLAN and QinQ packets’ headlines
  • traffic class in headline MPLS packets.

Tariff Plans for Users

Stingray SG allows to limit the bandwidth for the user (within the tariff plan) and to prioritize traffic within this bandwidth. This allows to provide high quality of service for demanded applications, even if the same IP address is assigned to several users, one of which creates uneven load of the channel (for example, by a running torrent client), that leads to a deterioration in the quality of sensitive services: streaming video, telephony, IPTV. The assignment of high priority to these services ensures their stable operation and high quality.

Uplink Expenses Decreasing and QoE Increasing

In order not to buy additional UPLINK speed during the peak hours, QoS function gives low priority to background applications (torrents, file downloads, updates, etc.) and a higher priority to online video, web browsing, online games. Thus, during peak hours, the user will not notice quality deterioration, and the UPLINK speed will not be exceeded.

Channel Upper Boundary Control

SCI DPI allows to control approaching to the upper boundary of the channel and prioritize traffic by protocols and directions so that low-priority traffic is forced out of the bandwidth in favor of a high priority.

Where to begin?

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