以下关于QoS中integrated Service服务模型的说法正确的是（）

B.它可以提供保证的宽带和时延来满足应用程序的要求

C.它可以提供负载控制服务(Controlled-Load service)，保证即使在网络过载(overload)的情况下，能对报文提供类似于网络未过载的服务，即在网络拥塞的情况下，保证某些应用程序的报文的低时延和高通过

D.在这种模型下，网络将为每个流(由源和目的的两端的IP、端口号)维护一个状态，并基于这个状态执行报文的分类、流量管理(policing)、排队及其调度，来满足对于程序的承诺

A.先进先出

B.保证服务

C.负载控制服务

D.类似ISDN的服务

A. Best-Effort

B. Integrated Service

C. Differenciated Service

D. FIFO Service

A.Best-Effort 

B.Integrated Service 

C.Differenciated Service

D.FIFO  Service

A.Integrate Service其实也就是RSVP

B.Integrate Service采用RSVP作为它的信令机制

C.RSVP是一个多用途的协议，除了Integrate Service之外，RSVP还可用于其他领域

D.Integrate Service适合于在骨干网上大量应用

A.Differentiated Service里，去往不同目的地的分组获得的服务是不同的

B.Differentiated Service里，来自不同信源的分组获得的服务是不同的

C.在Differentiated Service无需为每个流维护状态信息

D.Differentiated Service适合于在大型骨干网络上应用

A.SA场景下是5GC通过N2接口直接下发

B.QoS参数源头来自于UE的SIM卡里

C.UE的业务速率在QοS的控制下会保持不变

D.NSA场景下是通过X2-C接口由eNB下发，gNB侧进行映射

A.His research interests focus on integrated circuits and signal processing.

B.His research interests include integrated circuits and signal processing.

C.His research interests are engaged in integrated circuits and signal processing.

D.He has been engaged in research on integrated circuits and signal processing.

A.His research interests focus on integrated circuits and signal processing.

B.His research interests include integrated circuits and signal processing.

C.His research interests are engaged in integrated circuits and signal processing.

D.He has been engaged in research on integrated circuits and signal processing.

A.QoS Flow可以实现和EPS bearer的1：1映射

B.QoS Flow和Bearer的映射规则和决策点在SMF执行

C.SMF可以有选择地将部分QoS Flow映射到Bearer并切换到4G

D.由AMF分配QoS Flow(s)对应的EBI