User's Manual

B222s User’s Guide 83
CHAPTER 9
Quality of Service (QoS)
9.1 Overview
This chapt er discusses t he LTE Device’s QoS screens. Use t hese screens to set up your LTE Device
to use QoS for traffic m anagem ent .
Quality of Service ( QoS) refers to bot h a network’s ability t o deliver data with m inim um delay, and
the net working m ethods used t o cont rol t he use of bandwidth. QoS allows the LTE Device t o group
and prioritize applicat ion traffic and fine- t une network perform ance.
Wit hout QoS, all t raffic dat a is equally likely t o be dropped when t he net work is congested. This can
cause a reduct ion in network perform ance and m ake t he net work inadequate for t im e- critical
application such as video-on- dem and.
The LTE Device assigns each packet a pr iorit y and t hen queues t he packet accordingly. Packet s
assigned a high priorit y are pr ocessed m ore quickly than t hose with low priorit y if t here is
congestion, allowing tim e- sensit ive applications to flow m ore sm oothly. Tim e- sensitive applicat ions
include bot h t hose t hat require a low level of lat ency (delay) and a low level of j itt er (variat ions in
delay) such as I nternet gam ing, and t hose for which j itt er alone is a problem such as I nt ernet radio
or st ream ing video.
Note: The LTE Device has built -in configurations for Voice over I P ( I P) . The Quality of
Service ( QoS) feature does not affect VoI P t raffic.
• See
Section 9.6 on page 92 for advanced t echnical inform ation on SI P.
9.1.1 What You Can Do in this Chapter
• Use the Genera l screen to enable QoS, set the bandwidt h, and allow t he LTE Device t o
autom atically assign priorit y t o upstream traffic according to t he I EEE 802.1p pr iorit y level, I P
precedence or packet length (
Section 9.2 on page 84) .
• Use the Queue Se t up screen t o configure QoS queue assignm ent (
Section 9.3 on page 86) .
• Use the Cla ss Set up screen t o set up classifiers t o sort t raffic into different flows and assign
priorit y and define actions to be perform ed for a classified traffic flow (Sect ion 9.4 on page 87) .
• Use the Monit or screen t o view the LTE Device’s QoS- relat ed packet st atist ics (
Section 9.5 on
page 92
) .
9.1.2 What You Need to Know
The following term s and concept s m ay help as you read this chapt er.