3G/UMTS complete MO-CS Call Setup flow

CS Call setup message flow. 1. System Information (BCCH)  The UE reads the System Information that is broadcast on BCCH. The information is not read continuously. It is only read if the information changes  2. RRC: RRC Connection Request (CCCH)  The Mobile user decides to initiate a voice...

3G/UMTS complete message flow Mobile Originate Call Setup

Non-Access Stratum (NAS)

The non-access stratum(NAS) includes the protocols outside the access stratum,i.e. the protocols not related to the transport of user data or network signaling. They concern all data and signaling messages exchanged between the UE and the CN independently on the radio access technology implemented within the...

NAS(Non-Access Stratum)

Introduction to QoS

Quality of Service (QoS) is possibly the single most important concept in the field of optimization for Packet Switched networks. The Circuit Switched networks also have a mechanism to manage the quality of the service, which is well known and well established a long time ago. The dimensioning of the number of available circuits or channels in a given network node or associated interface is done...

Introduction to QoS

The four classes of QoS in UMTS

UMTS QoS Classes When defining the UMTS QoS classes, also referred to as traffic classes, the restrictions and limitations of the air interface have to be taken into account. It is not reasonable to define complex mechanisms as have been in fixed networks due to different error characteristics of the air interface. The QoS mechanisms provided in the cellular network have to be robust and capable...

UMTS QoS classes