合同是订立各方意思自愿协议成果，规定和约束着缔约各方的权利义务关系，调整当事人之间

A．SGW

B．MME

C．eNodeB

D．PCRF

A．A.MME

B．B.SGW

C．C.PDN GATEWAY

D．D.PCRF

A．HSS

B．SGW

C．PGW

D．SGSN

A．BSC

B．MME

C．SGW

D．eNodeB

A．SGW

B．UE

C．eNodeB

D．MME

A．MME

B．SGW

C．PGW

D．DNS

A．MME

B．SGW

C．UE

D．PDN-GW

A．UE

B．SGW

C．PDN-GW

D．MME

A．SGW

B．PGW

C．MME

D．PCRF