Signaling

procedures MINA ADLY

Understand signaling procedures for:

Call process

Intra Frequency HO process

Intra freq HO signaling RL addition

Intra freq HO signaling RL deletion

Intra freq inter RNC HO signaling RL addition

Inter freq ho signaling

Inter RAT ho signaling

Location update process

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Outgoing Call process signaling

In the coming slides we will explain the main signaling stages for an

outgoing call signaling process which is divided into the following

main parts

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1. RRC setup

2. Signaling connection setup

3. Authentication and Security Mode Control Procedure

4. Call Setup Procedure (Outgoing Call)

5. The RAB setup procedure is performed to set up a user plane bearer.

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Outgoing Call process signaling

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RRC setup

First a UE send a request for RRC

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Outgoing Call process signaling

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RRC setup

Then the RNC start negotiating with the Node B to activate a Radio

link

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Outgoing Call process signaling

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RRC setup

Then the RNC start preparing a transmission channel on the IUB

between it and the Node b

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Outgoing Call process signaling

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RRC setup

Finally the RNC send a setup request to the mobile and when the UE

send back a setup complete message so the RRC is successfully

assigned

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Outgoing Call process signaling

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RRC setup

Now if we are checking from Assistant what we will get is like this:

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Outgoing Call process signaling

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Signaling connection setup:

The signaling connection setup procedure is performed between the

UE and the CN to exchange NAS information, such as information

about authentication, service request, and connection setup.

CC --------connection confirm

CJ -------- connection rejectM.Adly

Outgoing Call process signaling

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Signaling connection setup:

And from assistant it is like below:

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Outgoing Call process signaling

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Authentication and Security Mode Control Procedure :

Auth

Security

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Outgoing Call process signaling

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Authentication and Security Mode Control Procedure :

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Outgoing Call process signaling

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Call Setup Procedure :

The UE sends to the SRNC an UPLINK DIRECT TRANSFER

message that contains the number of the called number and the

information about the bearing capability of the call.

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Outgoing Call process signaling

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Call Setup Procedure :

The UE sends to the SRNC an UPLINK DIRECT TRANSFER

message that contains the number of the called number and the

information about the bearing capability of the call.

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Outgoing Call process signaling

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Call Setup Procedure :

The SRNC transparently sends the contents of the UPLINK DIRECT

TRANSFER message to the CN through a DIRECT TRANSFER

message.

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Outgoing Call process signaling

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Call Setup Procedure :

The CN sends a DIRECT TRANSFER message to the SRNC. The

message indicates CALL PROCEEDING and contains the

information about the negotiated bearing capability of the call.

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Outgoing Call process signaling

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Call Setup Procedure :

The SRNC transparently sends the contents of the DIRECT

TRANSFER message to the UE through a DOWNLINK DIRECT

TRANSFER message.

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Outgoing Call process signaling

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Call Setup Procedure :

Then the RAB assignment process starts (we will explain in details)

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Outgoing Call process signaling

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Call Setup Procedure :

RAB assignment

The CN sends an RAB ASSIGNMENT REQUEST message to the

SRNC to initiate the RAB setup procedure.

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Outgoing Call process signaling

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Call Setup Procedure :

RAB assignment

Then the CN and the SRNC start arranging the transmission link for

this specific service and according to its QOS

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Outgoing Call process signaling

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Call Setup Procedure :

RAB assignment

The SRNC sends to the NodeB a RADIO LINK RECONFIGURATION

PREPARE message, requesting the NodeB to prepare for adding one or more

DCHs to the existing radio links for carrying the RAB.

The NodeB allocates the appropriate resources and then sends a RADIO

LINK RECONFIGURATION READY message to the SRNC.

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Outgoing Call process signaling

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Call Setup Procedure :

RAB assignment

The Iub ALCAP at the SRNC initiates a setup procedure for an Iub user plane

transport bearer. The NodeB and the SRNC perform synchronization by

exchanging uplink and downlink synchronization frames in the DCH frame

protocol.

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Outgoing Call process signaling

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Call Setup Procedure :

RAB assignment

The SRNC sends a RADIO BEARER SETUP message to the UE.

The SRNC sends a RADIO LINK RECONFIGURATION COMMIT message to the NodeB.

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Outgoing Call process signaling

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Call Setup Procedure :

RAB assignment

After performing radio bearer setup, the UE sends a RADIO BEARER

SETUP COMPLETE message to the SRNC.

The SRNC sends an RAB ASSIGNMENT RESPONSE message to the CN.

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Outgoing Call process signaling

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Call Setup Procedure :

RAB assignment

And from assistant it is so easy .

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Outgoing Call process signaling

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Call Setup Procedure :

When the called UE rings, the CN sends to the SRNC a DIRECT

TRANSFER message, indicating ALERTING

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Outgoing Call process signaling

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Call Setup Procedure :

The SRNC transparently sends the contents of the DIRECT

TRANSFER message to the UE through a DOWNLINK DIRECT

TRANSFER message.

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Outgoing Call process signaling

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Call Setup Procedure :

The CN sends to the SRNC a DIRECT TRANSFER message,

indicating CONNECT. This means the called has answered the call.

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Outgoing Call process signaling

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Call Setup Procedure :

The SRNC transparently sends the contents of the DIRECT TRANSFER

message to the UE through a DOWNLINK DIRECT TRANSFER message.

The UE sends an UPLINK DIRECT TRANSFER message to the SRNC.

The SRNC transparently sends the contents of the UPLINK DIRECT

TRANSFER message to the CN through a DIRECT TRANSFER message,

indicating CONNECT ACKNOWLEDGE.

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Outgoing Call process signaling

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Call Setup Procedure :

In case of a PS session we will find a PDP activation request and success in the

signaling like below

As you can see it start with the RAB start and success after the RAB success

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Intra freq HO signaling RL addition

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Intra freq HO signaling RL deletion

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Intra freq inter RNC HO signaling RL

addition

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Inter freq ho signaling

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Inter RAT ho signaling

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Location update process

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