03-WCDMA UTRAN Signaling Procedure

8/3/2019 03-WCDMA UTRAN Signaling Procedure
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WCDMA UTRAN Signaling
Procedure
Wireless Case and Training Department

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HUAWEI TECHNOLOGIES CO., LTD. All rights reserved Page 2
After this course, you will be able to:
Understand the definitions about UTRANnetwork elements
Understand UTRAN signaling procedure

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Chapter 1 Basic Concepts about UTRAN
Chapter 2 UTRAN Signaling Procedure

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RNL Control Plane Application Protocol
Node B
RNC
CN
UE
RANAP
NBAP
RNSAP RRC
NBAP Node B Application PartRANAP Radio Access Network Application PartRNSAP Radio Network Subsystem Application PartRRC Radio Resource Control
RNC

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RAB, RB and RL
UTRAN, RAB RB RL
RAB Qos
RB
RLNodeB
RNC CNUE
UTRAN

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UE Working Modes and States
Idle Mode
Connected Mode
CELL_DCH
CELL_FACHCELL_PCH
URA_PCH

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Idle Mode
The UE has no relation to UTRAN, only to CN. For data transfer, asignaling connection has to be established.
UE camps on a cell
It enables the UE to receive system information from the PLMN
UE can monitor PICH of a cell for pagingThe idle mode tasks can be divided into three processes:
PLMN selection and reselection
Cell selection and reselection
Location registration

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Connected Mode
When UE is in connected modeThe UE position can be known on different levels:
Cell level (CELL_DCH/CELL_FACH/CELL_PCH)
UTRAN Registration Area (URA) level (URA_PCH)
The UE can use different types of channels in connected mode
Dedicated transport channels (CELL_DCH)
Common transport channels (CELL_FACH)

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Connected Mode
Cell-DCHIn active state
Communicating via its dedicated channels
UTRAN knows which cell UE stays in

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Connected Mode
Cell-FACHIn active state
Few data to be transmitted both in uplink and in downlink. There is noneed to allocate dedicated channel for this UE
Downlink uses FACH and uplink uses RACHUE needs to monitor the FACH for its information
UTRAN knows which cell the UE stays in

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Connected Mode
Cell-PCH
No data to be transmitted or received
Monitor PICH, to receive its paging
UTRAN knows which cell the UE stays inUTRAN has to update cell information of UE when UEroams to another cell
Lower the power consumption of UE

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Connected Mode
URA-PCHNo data to be transmitted or received
Monitor PICH, to receive its paging
UTRAN only knows which URA (which consists of multiple cells) that
UE stays
UTRAN updates UE information only after UE has roamed to other
URA
A better way to reduce the resource occupancy and signaling
transmission

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CRNC
The CRNC owns the radio resources of a cell
Dynamical control of power for dedicated channels, within limits admitted byCRNC, is done by the SRNC.
Scheduling of data for dedicated channels is done by the SRNC, while forcommon channels it is done by the CRNC
Iub
Node B
Cell Cell Cell
Node B
...
Iu
CRNC
CN

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Chapter 1 Basic Concepts about UTRAN

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Section1 Call Overall Procedures
Section2 Cell Setup
Section3 System information broadcasting
Section3 UE Registration
Section4 Paging
Section5 Call Process
Section6 Handover

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Call Overall ProceduresNetwork side Start
1 Initialize equipment 2 Process system
broadcast
Step 1 Handset Power on 1 cell reselection
2 Location registration 3 Waiting for call
Step 2 Paging UE
Step 3
RRC connection
Establish
Step 4
NAS signaling
connection establish
Step 5 RAB set up
1 synchronous set up 2 asynchronous set up
Step 6RAB/RB
modification
Step 6Transport channel
reconfiguration
Step 6Physical channel
reconfiguration
Step 6 Soft/hard
handover
Step 6
URA update Step 6
Cell update
Step 6Handover with GSM
Step 7 RRC connection
release
Step 8 Waiting for call again
1 cell selection 2 wait for call

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Section1 Call Overall Procedures
Section2 Cell Setup
Section3 System information broadcasting
Section4 UE Registration
Section5 Paging
Section6 Call Process
Section7 Handover

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Cell Setup Flow

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Cell Setup Signaling Analysis
Audit request
The NodeB performs theresource status indicationprocedure to report its physicalresources to the Control RNC

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Cell setup
The following parameters will be take to NODEB
After receiving the AUDIT RESPONSEmessage from the NodeB RNC sends
a CELL SETUP REQUEST message tothe NodeB Whether the conditions ofcell setup are fulfilled depends on thefollowing local cell information
reported by the NodeB:
Downlink power range
Minimum spreading factor
HSDPA cell capability of the NodeB
High Speed Downlink SharedChannel (HS-DSCH) resourceinformation, which is used to set up
an HSDPA cell
Common transport channel andphysical channel information
CCP and NCP information

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Common transport channel setup (1) The common transport channel setupprocedure is performed to establish thenecessary resources in the NodeB,regarding the following channels:,PRACH, AICH, and RACH

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Common transport channel setup (2)The common transport channel setupprocedure is performed to establish the
necessary resources in the NodeB,regarding the following channels: S-CCPCH, PICH, FACH, PCH.

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System information update
The system information updateprocedure is performed for the NodeBto schedule and update the systeminformation segments, which arebroadcast on the Broadcast Channel
(BCH), according to the parameters inthe SYSTEM INFORMATION UPDATEREQUEST message.
If the system information is updated,the NodeB sends a SYSTEMINFORMATION UPDATE RESPONSE
message.

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Physical shared channel reconfiguration
The physical shared channelreconfiguration procedure is performed forthe NodeB to reconfigure the physicalchannels according to the PHYSICALSHARED CHANN

03-WCDMA UTRAN Signaling Procedure

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