陈yy的自学笔记 5G Qos
消息与接口：
SMF->AMF->RAN
N2 Session management消息，见23502 4.3.3，SMF将Qos profile和QFI带给RAN
3. UE获得Qos rule/parameter的方法
1) 信令显式配置，告知UE关于Qos flow 到DRB mapping规则
SMF以NAS信令的方式向UE提供以下内容。
Each signalled QoS rule contains:
a) an indication of whether the QoS rule is the default QoS rule;
b) a QoS rule identifier (QRI);
c) a QoS flow identifier (QFI);
d) optionally, a set of packet filters; and
e) a precedence value.
NOTE: The default QoS rule indication (DQR) of a signalled QoS rule cannot be changed.
（参考信息见TS 24.501 Section 6.2.5.1.1.2）.
If the UE requests a new QoS rule, it shall assign a precedence value for the signalled QoS rule which
is not in the range from 70 to 99 (decimal).
Within a PDU session:
a) each signalled QoS rule has a unique QRI;
b) there is at least one signalled QoS rule;
c) one signalled QoS rule is the default QoS rule; and
d) there can be zero, one or more signalled QoS rules associated with a given QFI.
2) Reflective mapping:
UE监控下行数据包中携带的QFI，在上行应用相同的映射规则；
Each derived QoS rule contains:
a) a QoS flow identifier (QFI);
b) a packet filter for UL direction; and
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