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4G/LTE - QoS |
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QCI stands for QoS Class Identifier. This is a special indentifier defining the quality of packet communication provided by LTE. The range of the class is from 1 to 9. Each of this class is defined as in the following table (TS 23.203).
(3GPP -23.203 Table 6.1.7: Standardized QCI characteristics : Release 8)
Note : GBR stands for Guaranteed Bit Rate
From Rel 12, 4 additional QCIs(65,66,69,70) are defined mainly for Public Safety Group Communication as shown below.
(3GPP -23.203 Table 6.1.7: Standardized QCI characteristics : Release 12)
The specific QCI value is allocated for each UE and is informed to UE via 'Activate default EPS bearer context request' message as shown below. (Followings are just a couple of examples.)
Activate default EPS bearer context request ::= DIVISION . ... EPS quality of service Length: 1 Quality of Service Class Identifier (QCI): QCI 9 (9)
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 kbps
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