Curso 5_Nuevas Tecnologías en Comunicaciones Móviles Celulares_sesion6

7/30/2019 Curso 5_Nuevas Tecnologas en Comunicaciones Mviles Celulares_sesion6

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Instituto Nacional de Investigaciny Capacitacin de Telecomunicaciones

UNIVERSIDAD NACIONAL DE INGENIERA

Nuevas Tecnologas enComunicaciones Mviles

Celulares

Programa de Ingeniera deComunicaciones Inalmbricas

Msc. Ing . Henry A . Vsquez


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Sistemas 3G


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Sistemas 3GUMTS network structure

Access Stratum contains the message flows and procedures needed to establish the connection betweenthe MT (mobile terminal) and network (roughly RNC in this case).

Serving Stratum handles message flows and procedures where the USIM+MT (same as UE, user

equipment) and the network establish a service. Service in this context means, for instance, setting up a

bearer for further purposes. These message flows are transferred transparently over the Access Stratum.

Application Stratum is the 'layer' handling message flows and procedures related to the user's applications.

Hence its scope is wider. For example, the UE has Internet browser and requests a certain URL to be

downloaded. The UMTS network only provides the 'pipe' (Serving Stratum), but the real HTML page isdownloaded from the Internet service provider.


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Sistemas 3G

The network management layers through the network


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Sistemas 3G

Relationship between the RAB and the RRC


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Sistemas 3G

The radio access bearer (RAB) contains a service connection between the UE

and the core network. A subscriber in UMTS may have several RABs and these

are combined into a radio resource connection (RRC) across the air interface.

There are basically two types of information: the user information and the control

information.

In the case of the RAB, the data (for instance a voice call or video) is the user

plane.


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Sistemas 3G

OSI model adaptation to UMTS


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Sistemas 3GImplementation of the transport layers

The transport plane of the Uu interface covers the three lowest layers of the OSI stack. Layer

1, the physical layer, uses WCDMA-FDD/TDD technology.

The Layer 1 is controlled by Layer 2, the data link layer. The structure of Layer 2 in the Uu

interface is a bit exceptional when compared to the other interfaces. Layer 2 has two sublayers

in the Uu (air) interface, MAC and RLC.

MAC (Medium Access Control) physically implements radio link management, that is, radio

link set-up, maintaining the physical radio channel configuration, error protection, encryption

and radio link deletion.

The functionality of the RLC (Radio Link Control) is similar as in normal Layer 2. This means

mainly flow control-related activities like for instance data block sequencing.

The Layer 3 of the Uu interface contains functions needed for the transport plane control. The

control entity is called Radio Resource Control (RRC). RRC manages the physical layer and its

activities whenever required. If, for instance, a radio link is to be set up, the RRC gives a

command to perform this activity. The command is delivered via RLC to MAC, and MAC

performs the activity. Finally, the radio link set-up is carried through the Layer 1.

Uu (air) interface


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Sistemas 3G

Transport plane in the Uu interface


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Sistemas 3G

Iub, Iur and Iu interfaces

Iub transport plane Iur interface transport plane


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Sistemas 3GIub, Iur and Iu interfaces

Iu-PS interface transport plane

Iu-CS interface transport plane


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Sistemas 3G

Control plane ( Serving Stratum)Iub interface control plane (NBAP - Node B Application Part)

In the Iub interface the control plane is maintained by the signalling protocol NBAP (Node B Application Part). In order to adapt the

NBAP properly on top of the AAL5 (ATM Adaptation Layer 5), some convergence protocols are required.Note: In this chapter the term convergence protocol(s) means signalling protocols making adaptations between two protocol layers in general.

Iub radio network control plane


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Sistemas 3G

Iu interface control plane (RANAP

Radio Access Network Application Part)In the Iu interface the control plane is maintained by the signalling protocol RANAP (Radio

Access Network Application Part).

Iu interface control plane


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Sistemas 3G

RAB and CN domains


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Sistemas 3G

Bearer between the UE and core network circuit domain


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Sistemas 3G

Bearer between the UE and core network packet domain


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Sistemas 3G

User plane ( Application Stratum)The user plane signalling takes place between the application(s) of the UE (user) and the destination over thephysical connection established over the transport plane by using the facilities the control plane offers.

In the Uu interface the user plane consists of the DPDCHs (Dedicated Physical Data Channels) allocated for

the connection (and the data they carry, naturally).

Iub user plane


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Sistemas 3G

Iu interface user planes for CN circuit and packet domain


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Sistemas 3G


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Curso 5_Nuevas Tecnologías en Comunicaciones Móviles Celulares_sesion6

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