有很详细的3G无线信令介绍Introduction11.1NetworkArchitecture11.2RadioAccessTechnology41.3Standardisation102FlowofData132.1RadioInterfaceProtocolStacks132.1.1RadioInterfaceControlPlane142.1.2RadioInterfaceUserPlane192.2RRCLayer272.2.1RRCStates282.2.2RRCProcedures542.2.3RRCMessages562.2.4UE