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QoS Cl ass Identi fi er - W i ki pedia, the fr ee encyclopedi a
QoS Class Identifier From Wikipedia, the free encyclopedia QoS Class Identifier (QCI) is a mechanism used in 3GPP Long Term Evolution (LTE) networks to ensure
bearer traffic is allocated appropriate Quality of Service (QoS). Different bearer traffic requires different QoS and therefore different QCI values. QCI value 9 is typically used for the default bearer of a UE/PDN for non privileged subscribers.[1]
Background To ensure that be that bearer arer traffic in LTE networks is appropriately handled, a mechanism is needed to classify the different types of bearers into different classes, with each class having appropriate QoS parameters for the traffic traffic type. Examples of the QoS parameters include Guaranteed Bit Rate (GBR) or non-Guaranteed Bit R ate ate (non-GBR), Priority Handling, Packet Delay Budget and Packet Error Loss rate. This overall mechanism is called QCI.
Mech Me cha anism The QoS concept as used in LTE networks is class-based, where each bearer type is assigned one QoS Class Identifier (QCI) by the network. The QCI is a scalar that is used within the access network (namely the eNodeB) as a reference to node specific parameters that control packet forwarding treatment, for example scheduling weight, admission thresholds and link-layer protocol configuration. The QCI is also mapped to transport network layer Layer parameters in the relevant Evolved Packet Core (EPC) core network nodes (for example, the PDN Gateway (P-GW), Mobility Management Entity (MME) and Policy and Charging Rules Function (PCRF) ), by preconfigured QCI to Differentiated Services Code Point (DSCP) mapping. According to 3GPP TS 23.203, 13 QCI values are standardized and associated with QCI characteristics, in term of packet forwarding treatment that the bearer traffic receives edge-to-edge between the UE and the P-GW. Scheduling priority, packet delay budget and packet error loss rate are the set of characteristics defined b y the 3GPP standard and they should be understood under stood as guidelines for the pre-configuration of node specific parameters to ensure that applications/services mapped to a given QCI receive the same level of QoS in multi-vendor env multi-vendor environments ironments as well well as in roaming scenarios. The QCI characteristics are not signalled on any interface. The following table illustrates the standardized characteristics as defined in the 3GPP TS 23.203 standard "Policy and Charging Control Architecture".
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QoS Class Identifier - Wikipedia, the free encyclopedia
Resource QCI Priority Type
Packet
Packet
Delay
Error
Budget
Loss
Example Services
1
GBR
2
100ms
10−2
Conversational Voice
2
GBR
4
150ms
10−3
Conversational Video
3
GBR
3
50ms
10−3
Real Time Gaming
4
GBR
5
300ms
10−6
Non-Conversational Video (Buffered Streaming)
65
GBR
0.7
75ms
10−2
Mission Critical user plane Push To Talk voice (e.g., MCPTT)
66
GBR
2
100ms
10−2
Non-Mission-Critical user plane Push To Talk voice
5
non-GBR 1
100ms
10−6
IMS Signalling
6
non-GBR 6
300ms
10−6
7
non-GBR 7
100ms
10−3
Video (Buffered Streaming) TCP-Based (for example, www, email, chat, ftp, p2p and the like) Voice, Video (Live Streaming), Interactive Gaming Video (Buffered Streaming) TCP-Based (for example, www,
8
9
non-GBR 8
non-GBR 9
300ms
300ms
10−6
email, chat, ftp, p2p and the like)
10−6
Video (Buffered Streaming) TCP-Based (for example, www, email, chat, ftp, p2p and the like). Typically used as default bearer
69
non-GBR 0.5
60ms
10−6
70
non-GBR 5.5
200ms
10−6
Mission Critical delay sensitive signalling (e.g., MC-PTT signalling) Mission Critical Data (e.g. example services are the same as QCI 6/8/9)
Every QCI (GBR and Non-GBR) is associated with a Priority level. Priority level 0.5 is the highest Priority level. If congestion is encountered, the lowest Priority level traffic would be the first to be discarded. QCI-65, QCI-66, QCI-69 and QCI-70 were introduced in 3GPP TS 23.203 Rel-12.
References 1. "3GPP TS 23.203 Policy and Charging Control Architecture". Retrieved 14 January 2015.
http://www.3gpp.org/DynaReport/23203.htm https://en.wikipedia.org/wiki/QoS_Class_Identifier
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Retrieved from "https://en.wikipedia.org/w/index.php?title=QoS_Class_Identifier&oldid=706792658" Categories: Telecommunications 3GPP standards LTE (telecommunication) Mobile technology Mobile telecommunications Mobile telecommunications standards This page was last modified on 25 February 2016, at 09:05. Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.
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