Slide title In CAPITALS 50 pt Slide subtitle 32 pt Naren Mohan [email protected] Layer 3 Messaging and Call Procedures

Slide titleIn CAPITALS

50 pt

Slide subtitle 32 pt

Naren Mohan

[email protected]

Layer 3 Messaging and Call Procedures

Top right corner for field-mark, customer or partner logotypes. See Best practice for example.

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Text 24 pt

Bullets level 2-520 pt

Ericsson Confidential Naren Mohan 2006-05-042 (34)

Agenda

Protocol Layers & Signaling

Radio Network Procedures

Example Call Flows

KPI Calculation Triggers


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Channels

Logical Channels – Defines what information to be transferred

Transport Channels – Defines how data should be transferred.

Physical Channels – Carry the data


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Protocol Layers

L2/MAC

L1

L2/RLC

L3/RRC

UTRANUE

RRC

RLC

MAC

PHY

RRC

MAC

PHY

RLC RLC RLC

Signaling Radio Bearer

Radio Bearer

Logical Channel

Transport Channel

Physical Channel

CTRL CTRLUSERDATA

USERDATA


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Layer 3 Signaling The Control Signaling is used for troubleshooting the problems. These

messages are carried in the Logical Control Channels such as DCCH, CCCH, BCCH.

Radio Resource Control (RRC) Protocol messages contain the necessary control information and the commands – Obtained from TEMS.

In the Iub we may be interested in the NBAP and RANAP protocol messages – Obtained from UETR.

PHY

RLC/MAC

RRC

MM GMM

CC SM

PHY

RLC/MAC

RRC

Sig. Bearer

SCCP

RANAP

UE WRAN

Sig. Bearer

SCCP

RANAP

MM GMM

CC SM

MSC/VLR or SGSN


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RRC Protocol Functions Carries most of the Control Signaling between the UE

and the UTRAN. Carries all the information required to setup, modify

and release lower layer entities. RRC Controls

– Radio Bearer parameters such as RLC Timers, QoS– Transport channel parameters such as the Transport

format Combination (TFC)– Physical Channel parameters such as Code usage, carrier

frequency

Radio Resource Supervision


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RRC Connected Mode

RRC States

CELL_PCH

CELL_FACH

IDLE MODE

CELL_DCH

RRC Connection Establishment

RRC Connection Release

RRC Connection ReleaseRRC Connectio

n Establishment

Radio Bearer Reconfiguration


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Layer 3 Procedures

RRC Setup and RRC release Measurement Reports Active Set Update Radio Bearer Setup and Reconfiguration Transport Channel Reconfiguration Physical Channel Reconfiguration All Call setup and tear down messages (such as PDP

Activation/Deactivation, Alerting/Release etc) - These are Call Control and Session Management messages.


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System Information Blocks (BCH) RRC Protocol Schedules the SIBs. The system information blocks are arranged as a tree structure. The

Master Info. Block (MIB) contains the reference and scheduling info for the SIBs.

UE receives SIBs in Idle or CELL_FACH modes

MIB

SIB 1 SIB 3 SIB 5 SIB n

SIB n.1 SIB n.2

SIB 7 SIB 11

LA

/ RA

U

pd

ating

, P

agin

g, id

le m

od

e tim

ers

CR

S P

arameters

Cell / C

om

mo

n

Ch

. Co

nfig

uratio

n

Po

wer C

on

trol o

n

Co

mm

on

C

han

ne

ls

Measu

rem

ent

Man

ag

emen

t


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Measurement Procedures

Remember !!! – Unlike GSM, the measurement reports event triggered. You can see long times of silence from the UE. These are not to be confused as missing messages.

UE RNC

RRC: Measurement Report (DCCH)

RRC: Measurement Control (BCCH/DCCH)

UE Measures the SCs and performs Evaluation for Event Trigger Criteria.

RRC: Active Set Update (DCCH)

RNC Evaluates based on the measurements and Network Configuration.


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Cause codes will indicate the problem if RRC Connection is rejected

UE RNC

RRC: RRC Connection Request (CCCH)

RRC: RRC Connection Setup (CCCH)

RRC: RRC Connection Setup Complete (DCCH)

Cause Code for connection Request Sent:•Originating Streaming Call• Originating Interactive Call• Originating Background Call• Terminating Conversational Call• Terminating Streaming Call• Terminating Interactive Call• Terminating Background Call• Emergency Call• Registration• Originating High Priority Signalling• Call re-establishment• Terminating High Priority Signalling• Terminating cause unknown

Contains the UE Capability (HS or R99)

RRC Connection can be rejected to Admission & Congestion Control Features


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T >T300

UE starts timer T=0, counter N=1

UE sends RRC Connection Request

UE increments Timer T

UE gets RRC Connection Setup

UE sends RRC Connection Setup Complete

N = N + 1T=0

N > N300

Fail. UE goes into idle mode

UE gets RRC Connection Reject

Cause = “Wait’

Wait for ‘wait’ secondsN = N + 1

T=0UE sends RRC

Connection Request

N

N

N

Y

Y

Y

Y Y

N

NRRC Procedure

Successful


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Radio Bearer Setup

RAB (Radio Access Bearer) is setup between Core and UE. Radio Bearer is setup between UE and UTRAN to support

the RAB.

UE RNC

RRC: Radio Bearer Setup (DCCH)

RRC: Radio Bearer Setup Complete (DCCH)

CN

RANAP: Radio Access Bearer Request

RANAP: Radio Access Bearer Response (DCCH)


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Active Set Update

UTRAN sends Active Set Update to the UE in CELL_DCH mode.

The result could be one of the following– Radio Link Addition– Radio Link Removal– Radio Link Replacement (Combined Addition/Removal)

UE RNC

RRC: Measurement Report (e1a, e1b, e1c) (DCCH)


RRC: Active Set Update Complete (DCCH)

Timeout of 5 s


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Radio Bearer Reconfiguration

RB Reconfiguration occurs for the following scenarios– Channel Type Switch i.e., DCH to FACH, FACH to DCH– Reconfiguration of the Radio Bearer after RB Setup (such as

RLC timer reconfiguration)

UE RNC

RRC: Radio Bearer Reconfiguration (DCCH)

RRC: Radio Bearer Reconfiguration Complete (DCCH)

FACH/DCH

DCH/FACH


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Transport Channel Reconfiguration

Transport Channel Reconfiguration procedure triggers the Channel Rate Switching. 64K <-> 128K <-> 384K

UE RNC

RRC: Transport Channel Reconfiguration (DCCH)

RRC: Transport Channel Reconfiguration Complete (DCCH)


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Physical Channel Reconfiguration

Physical channel reconfiguration procedure is used to establish, reconfigure and release physical channels.

Used to enter Compressed mode before IRAT, HSDPA Cell Change

UE RNC

RRC: Physical Channel Reconfiguration (DCCH)

RRC: Physical Channel Reconfiguration Complete (DCCH)


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RRC Connection Release

When the RRC Connection is released, the UE will be in IDLE mode. Radio Bearers will be released.

RRC Connection can be released abnormally if

UE RNC

RRC: RRC Connection Release (DCCH / CCCH)

RRC: RRC Connection Release Complete (CCCH)

RRC: RRC Connection Abnormal Release (DCCH / CCCH)


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Example Voice Call Flow (MOC)UE RNCRRC: RRC Connection Request (CCCH)



RRC: Initial Direct Transfer - CM Service Request (DCCH)

RRC: Downlink Direct Transfer – Auth & Ciph Request (DCCH)

RRC: Uplink Direct Transfer - Auth & Ciph Response (DCCH)

RRC: Security Mode Command (DCCH)

RRC: Security Mode Complete (DCCH)

RRC: Uplink Direct Transfer - SETUP (DCCH)

RRC: Downlink Direct Transfer – CALL PROCEEDING (DCCH)


RRC: Downlink Direct Transfer – ALERTING (DCCH)


RRC: Downlink Direct Transfer - CONNECT (DCCH)

RRC: Downlink Direct Transfer – CONNECT ACK (DCCH)

RRC: Measurement Control (DCCH)


Call Setup Phase

KPIs: •Call Setup Success Rate•Call Setup Time

RRC: Uplink Direct Transfer - DISCONNECT (DCCH)

RRC: Direct Transfer - Release (DCCH)

RRC: Uplink Direct Transfer – Release Complete (DCCH)

Total Call Time

KPIs: •Dropped Call

RRC Connection is released after the Call Release.


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Example PS R99 Call FlowUE RNCRRC: RRC Connection Request (CCCH)



RRC: Initial Direct Transfer - CM Service Request (DCCH)

RRC: Downlink Direct Transfer – Auth & Ciph Request (DCCH)

RRC: Uplink Direct Transfer - Auth & Ciph Response (DCCH)

RRC: Security Mode Command (DCCH)

RRC: Security Mode Complete (DCCH)

RRC: Uplink Direct Transfer – SM ACTIVATE PDP CONTEXT REQUEST (DCCH)


RRC: Downlink Direct Transfer – SM ACTIVATE PDP CONTEXT ACCEPT (DCCH)




RRC: Uplink Direct Transfer – SM Deactivate PDP Context Request (DCCH)

RRC: Direct Transfer – SM Deactivate PDP Context Accept (DCCH)

RRC: RRC Connection Release (DCCH)

Call Setup Phase

KPIs: •Call Setup Success Rate•Call Setup Time

Total Call Time

KPIs: •Dropped Call


RRC: Transport Channel Reconfiguration Complete (DCCH)Channel Switching


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Example HSDPA Call FlowUE RNCRRC: RRC Connection Request (CCCH)





RRC: Measurement Report (e1a) (DCCH)





E1A:Radio Link AdditionNot a HS Cell Change. Here the procedure is to realign the parameters.

RRC: Measurement Report (e1d) (DCCH)





E1D:Change of Best ServerHS Cell ChangeKPI

•HS Cell Change Success Rate•HS Cell Change time

KPI•Call Setup Success Rate•Call Setup Time


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Example IRAT Handover (PS)UE RNC






RRC: Measurement Report (e1b) (DCCH)








RRC: Measurement Report (e2d) (DCCH)



RRC: Cell Change Order From UTRAN (DCCH)

UE Enters Compressed Mode, Starts

measuring in GSM

Handover to GSM. UE performs RA update in GSM

RRC: Handover From UTRAN (DCCH)

Handover to GSM. Handover Complete message in GSM indicates successful Handover

RRC: Downlink Direct Transfer – Connect (DCCH)

RRC: Uplink Direct Transfer – SM Alerting (DCCH)



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CS IRAT Handover (Core Perspective)UE RNC MSC/

MGW BSC

RANAP: Relocation Required


BSSMAP: Handover Request

BSSMAP: Handover Request Ack

RANAP: Relocation Command

RRC: Handover from UTRAN

RR: Handover Access

RR: Handover Complete

RANAP: Iu Release Command

RANAP: Iu Release Complete

Timer: T_RELOC_Prep


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Example HSDPA/FACH Iur HandoverUE RNC








RRC: RRC Connection Release (DCCH)

RRC: RRC Connection Request (CCCH)





RRC Establishment Cause Code:

“Call Re-Establishment”

Or “Directed Signalling Re-establishment”

RRC: Radio Bearer Reconfiguration (DCCH)

RRC: Radio Bearer Reconfiguration Complete (DCCH)

RRC: Cell Update (CCCH)

UE does Channel Type

Switch to CELL_FACH


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Some Abnormal Cases


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Abnormal Drop CaseUETRTEMS LOGS from UE


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KPI Definitions


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KPI Definition – CS Drop

RRC Connection Request

RRC Connection Setup Complete

Alerting

Connect

Event = Dropped Call

Dedicated Mode To Idle Mode

RRC Connection Abnormal Release

AMRTotal Call Duration

Disconnect

CS Dropped Call Rate (Long Call) =

Effective Calls = Total Call Duration / 90 sec (MHT)

Attempts CallEffective

Drops Total


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KPI Definition – PS DropPacket Call

RRC Connection Request RRC Connection

Setup CompleteActivate PDP Context Accept

Session Start(TEMS

Internal) Session End/Error(TEMS Internal)

RRC Connection Request/RRC Connection Setup Complete

Deactivate PDP Context Req/Accept


Total Call Duration

PS Drop Rate (Long Calls) =

Effective Calls = Total Call Duration / 60 sec (MHT)

entestablishm-re RRC No. Total CallsEffective Total

entsestablishm-re RRC No. Total


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KPI Definition – Call Setup Success



Alerting

RRC Connection Reject No Alerting Or

ConnectRRC Connection Request Exceeds N300

AMR

If total time between RRC Connection Request And Connect Exceeds 50 Seconds (setup timeout) = Access Failure



Activate PDPContext Accept

RRC Connection Reject

No Activate PDP Context Accept/Session StartRRC Connection Request

Exceeds N300

Packet Call

If total time between RRC Connection Request And Session Start Exceeds 50 Seconds (setup timeout) = Access Failure

Attempts Setup Call Total

resSetupFailu Call -1


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KPI Definition - Throughput

N

Session

Session

1

1

Session

Session

Duration Session

Received Bytes

(DL) Throughput App. Avg.

N

Activate PDP Context Accept Session Start

(TEMS Internal) Session End/Error

(TEMS Internal)


Deactivate PDP Context Req/Accept

Session Start(TEMS

Internal) Session End/Error

(TEMS Internal)

Session Duration Session Duration

Thput)}RLC*BLER)-E{(1 (DL) ThroughputTrCHAvg

Thput}RLC neousE{Instanta (DL) Throughput RLC. Avg.


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KPI Definition - IRAT

GSMUMTS

Handover Command Inter System To Utran

Handover Access

Handover Complete

Measurement Report

GSM/GPRSUMTS

Cell Change Order from UTRAN Command

Routing Area Update Request

Routing Area Update Accept

MeasurementReport

UMTS To GSM PS Handover

UMTS To GSM CS Handover


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Documents

Slide title In CAPITALS 50 pt Slide subtitle 32 pt Naren Mohan [email protected] Layer 3 Messaging and Call Procedures