7

Quality of Service (QoS)

7.1 Overview

This chapter discusses the LTE Device’s QoS screens. Use these screens to set up your LTE Device to use QoS for traffic management.

Quality of Service (QoS) refers to both a network’s ability to deliver data with minimum delay, and the networking methods used to control the use of bandwidth. QoS allows the LTE Device to group and prioritize application traffic and fine-tune network performance.

Without QoS, all traffic data is equally likely to be dropped when the network is congested. This can cause a reduction in network performance and make the network inadequate for time-critical application such as video-on-demand.

The LTE Device assigns each packet a priority and then queues the packet accordingly. Packets assigned a high priority are processed more quickly than those with low priority if there is congestion, allowing time-sensitive applications to flow more smoothly. Time-sensitive applications include both those that require a low level of latency (delay) and a low level of jitter (variations in delay) such as Internet gaming, and those for which jitter alone is a problem such as Internet radio or streaming video.

7.1.1What You Can Do in this Chapter

•Use the General screen to enable QoS, set the bandwidth, and allow the LTE Device to automatically assign priority to upstream traffic according to the IP precedence or packet length (Section 7.2 on page 50).

•Use the Queue Setup screen to configure QoS queue assignment (Section 7.3 on page 51).

•Use the Class Setup screen to set up classifiers to sort traffic into different flows and assign priority and define actions to be performed for a classified traffic flow (Section 7.4 on page 52).

•Use the Monitor screen to view the LTE Device’s QoS-related packet statistics (Section 7.5 on page 56).

7.1.2What You Need to Know

The following terms and concepts may help as you read this chapter.

QoS versus Cos

QoS is used to prioritize source-to-destination traffic flows. All packets in the same flow are given the same priority. CoS (class of service) is a way of managing traffic in a network by grouping similar types of traffic together and treating each type as a class. You can use CoS to give different priorities to different packet types.

 

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LTE6100 User’s Guide