概述
QCI的作用，比如打电话，打电话有一个过程，首先会建立信道，中间在建立一个EPS bearer，在EPS中会携带者一个qci。可以直接看QCI描述。
可以直接查看百度百科：QCI百度百科
QCI表示Qos类别指示。这是一种特定标识 ，其定义了LTE数据报通信的质量。
QCIL类别范围 1~9（每个类别的定义如下表所示）
| QCI | Resource Type | Priority | Packet Delay Budget(NOTE 1) | Packet Error Loss Rate(NOTE 2) | Example Services |
| 1 | GBR | 2 | 100 ms | Conversational Voice | |
| 2 | 4 | 150 ms | Conversational Video（Live streaming） | ||
| 3 | 3 | 50 ms | Real Time Gaming | ||
| 4 | 5 | 300 ms | Non-conversational voice(buffered streaming) | ||
| 5 | Non-GBR | 1 | 100 ms | IMS signaling | |
| 6 | 6 | 300ms | Video (buffered streaming), TCP-based (e.g. www, email, chat, ftp, p2p file sharing, progressive video,etc) | ||
| 7 | 7 | 100 ms | Voice, Video (live streaming), interactive gaming | ||
| 8 | 8 | 300 ms | Video (buffered streaming), TCP-based (e.g. www, email, chat, ftp, p2p file sharing, progressive video,etc) | ||
| 9 | 9 | Video (buffered streaming), TCP-based (e.g. www, email, chat, ftp, p2p file sharing, progressive video,etc) |
QCI9 : 是LTE默认承载，任何4G终端驻留4G的时候QCI9常驻；
QCI5 : 是IMS消息专用通道，就是支持VOLTE的终端打开了VOLTE就一直存在QCI9+5；
QCI1 : 是VOLTE语音通道，通话的时候就建立，VOLTE终端通话的时候就是QCI9+5+1；
QCI2 : 是VOLTE视频通话通道，视频通话的时候建立，VOLTE终端视频通话的时候就是QCI9+5+1+2；
注意：
通过 “Activate default EPS bearer context request” 消息来给每一个UE 分配特定的QCI值并通知到UE
Activate default EPS bearer context request ::= DIVISION
. ...
EPS quality of service
Length: 1
Quality of Service Class Identifier (QCI): QCI 9 (9)
//QCI
Activate dedicated EPS bearer context request ::= DIVISION
. ...
EPS quality of service
Length: 5
Quality of Service Class Identifier (QCI): QCI 1 (1)
Maximum bit rate for uplink : 1 kbps
Maximum bit rate for downlink : 1 kbps
Guaranteed bit rate for uplink : 1 kbps
Guaranteed bit rate for downlink : 1 kbpsQCI描述
| GBR | |
| QCI=1 | Example Services: Conversational voicemscbsc |
| QCI=2 | Conversational Video (Live streaming) |
| QCI=3 | Real Time Gaming |
| QCI=4 | Non-conversational voice (buffered streaming) |
| Non-GBR | |
| QCI=5 | IMS signaling |
| QCI=6 | Video (buffered streaming), TCP-based (e.g. www, email, chat, ftp, p2p file sharing, progressive video,etc) |
| QCI=7 | Voice, Video (live streaming), interactive gaming |
| QCI=8 | Video (buffered streaming), TCP-based (e.g. www, email, chat, ftp, p2p file sharing, progressive video,etc) |
| QCI=9 | Video (buffered streaming), TCP-based (e.g. www, email, chat, ftp, p2p file sharing, progressive video,etc) |
| QCI9是LTE默认承载，任何4G终端驻留4G的时候QCI9常驻； QCI5是IMS消息专用通道，就是支持VOLTE的终端打开了VOLTE就一直存在QCI9+5； QCI1是VOLTE语音通道，通话的时候就建立，VOLTE终端通话的时候就是QCI9+5+1； QCI2是VOLTE视频通话通道，视频通话的时候建立，VOLTE终端视频通话的时候就是QCI9+5+1+2； | |
最后
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