Ericsson WCDMA RAN Overview

September 03, 2007

BANDUNG

Ericsson WCDMA RAN Platform

Connectivity Packet Platform (CPP)

- RNC

- RXI

- RBS/Node B

WCDMA RAN INTERFACES

WCDMA RAN Interfaces protocol :

• Iu Interfaces (RNC toward Core Network)

Iu interfaces consist of : Iu-CS and Iu-PS

• Iub Interfaces (RNC toward RBS)

• Uu Interfaces (RBS toward UE)

Iu – CS Protocol

Iu – PS Protocol

Iub Protocol

Ericsson RAN consist of :

- Radio Network Controller (RNC)- Radio Access Network Aggregator (RANAG/RXI) optional- Node B

Iu Connection

Iub Connection

RBS RANAG/RXI RNC

Iub Iub

Connection Between RBS and RNC

Transport Channel Hierarchy

User PlaneDCH, PCH, RACH, FACH

ALCAP

NBAP-C

Mub(*)

Sync

NBAP-D

AAL2

AAL5

AAL5

AAL5

AAL0

AAL5

VC

VC

VC

VC

VC

VC

VPPhysicallayer

VP

VC

VC

VC

VC

VC

VC

AAL2

AAL5

AAL5

AAL5

AAL0

AAL5

ATM

Adapt

atio

n La

yer

Virtua

l Cha

nnel

Virtua

l Pat

h

Physic

al

Trans

miss

ion

(PDH/S

DH)

ATM

Adapt

atio

n La

yer

Virtua

l Cha

nnel

Virtua

l Pat

h

User PlaneDCH, PCH, RACH, FACH

ALCAP

NBAP-Common

Mub(*)

Sync

NBAP-Dedicated

Example MO Configuration in RNC

Example MO Configuration in RBS

Example MO Configuration in RXI

Example Traffic Descriptor

Iub & Mub TD VCI AAL2 Path Remarks

VP Descriptor C1P4500 VPI=1    

Mub-a U4 32   RBS# = RBS O&M id

Mub-b U4 33    

Sync-a C1P5 34    

Sync-b C1P5 35    

NBAPC-a U3P1000M80 36    

NBAPD-a U3P1000M80 37    

Q2630-a U3P1000M80 38    

Sync-c C1P5 41   optional TUB

Sync-d C1P5 42   optional TUB

NBAPC-b U3P1000M80 43    

NBAPD-b U3P1000M80 44    

Q2630-b U3P1000M80 45    

AAL2 Path C2P4000 39 1<RBS#>  

AAL2 HS Path U4 50 3<RBS#>  

Node B – RXI (HSDPA, 1E1)

Traffic Descriptor

• C1P5 C = CBR, QoS=1, P=PCR ( 5 cps)• C2P5370 C = CBR, QoS=2, P=PCR (5370 cps)• U3P1000M80

U = UBR+, QoS=3, P=PCR (1000 cps), M=MCR (80 cps)• U4

U=UBR, Qos=3

CBR = Constant Bit Rate PCR=Peak Cell Rate QoS = Quality of Services UBR = Unspecified Bit Rate MCR=Minimum Cell Rate

Radio Network Controller

RNC Hardware

3G Transport for the Radio Access

WCDMA Radio Access Network

Radio Network Layer

Transport Network Layer

UMTS network

WCDMA RAN: End-to-end view

WCDMAPHY L1

MAC

RLC

PDCP

MAC

RLC

PDCP

WCDMAPHY L1 ATM

Transmission

AAL2

ATM

Transmission

AAL2

ATM

Transmission

AAL2

ATM

Transmission

AAL2

UE Node B RNCAAL2 Switch

ATM

Transmission

AAL2

ATM

Transmission

AAL2

ATM

Transmission

AAL2

ATM

Transmission

AAL2

end-to-end application traffic

RXI820or RNC

3810RBS3000

RBS3000

ATMWCDMA

RXI Layered Model

RXI and RAN Transport

Transport

Traffic Type MappingTraffic types & service categories

Traffic TypeService

CategoryQoS Class

Applicable Traffic

Parameter

Adaptation

LayerCharacteristicsTraffic Type

Traffic Type CBR 1 PCRAAL0AAL1

A constant bit rate specified by Peak Cell Rate (PCR) is guaranteed.

Network SyncCircuit Emulation

Traffic Type CBR 2 PCR AAL2AAL2 Voice and Data

Traffic Type UBR+ 3MCR

PCR (opt)AAL5

SignallingO&M

Traffic Type UBR 4 -AAL2AAL5

HSDPAO&M

A constant bit rate specified by Peak Cell Rate (PCR) is guaranteed.

Cell rates up to a Minimum Cell Rate (MCR) is guaranteed. Above the MCR it

acts as an UBR service. Optionally a PCR for shaping purposes

There are no guarantees that cells will be delivered. No bandwidth is therefore

specified.

E1/T1

SDH /SONET

Easy transmission connectivity

Flexibility in RNC/RBS management

Robustness of a duplicated RXI/RNC link with AAL2 load sharing

STM-1 (VC-12) / OC-3

duplicatedSTM-1 /OC-3c

Bandwidth sharing with AAL2 Switching and

Aggregation functionality in hub RBS and/or RXI

results in up to 65% link capacity savings

Hub RBS

RXI RNC

Typical RXI/RNC combinationfor Optimized 3G Transport

Platform architecture

Interface (ET) board

Interface (ET) board

Interface (ET) board

Interface (ET) board

Switch Core Board (SCB)

Processor Board (Central

Processing)

Timing Unit Board (TUB)

Redundant Configurationssupported

Hardware Topology

RXI 820: Magazine mechanics

• Standard 19" magazine– Based on Ericsson BYB 501 building practice– All connectors on board front– EMC-shielded– Redundant -48V power feed, less than 800

Watts per magazine– Fan cooled, air inlets on front bottom, outlet on

top back

• Up to 28 boards per magazine – 15 mm board spacing, PBA size 225 x 265

mm– 19 slots available for any interface or

processor board– Supports hot insertion of boards

RXI Subrack

System boards

• Functions:– Main Processor (MP)– Basic functions incl O&M– AAL5 termination

• Front connectors:– 1 Ethernet 10baseT/100baseT– 1 RS-232 port

GPBGeneral Processor Board

• Functions:– Cell switching (28 x 622 Mbps

switching)– Synchronization distribution– Power filtering (800W)

• Front connectors:– Subrack power inlets– Fan power and control

SCBSwitch Core Board

• Functions:– Stabilized clock for network

synchronization– Generation of UTRAN RBS

specific frequencies and SFN• Front connectors:

– One input of 2 MHz reference– One input of 10 MHz reference

• Capacity:– 50 ppb frequency accuracy– One hour holdover

TUBTiming Unit Board

RBS 3000 Family

RBS 3202 RBS 3101

RBS 3303

RBS 3104

RBS 3402RBS 3106RBS 3206

RBS 3107

RBS Architecture

ETB 5 RAX

(18)

BBIFB

(2)

BBIFB

(1,2) RAX (1-9)

TU (1,2)

TU (1,2)

TXB (2)

ETB 1-5

MP 1

GPB 1-3

TXB (1,2)

Gamma

ATM

Timing

ECP

I2C GPB++

Timing

Baseband sub-rack

I2C

AU-HUB

PCU XALM

Sub rack FAN

CU

SCB 1-2

SCB 1-2

ECP

CBU

PowerBus-bar (Breakers & fuses)

PDU

RUIF

AIUB

TRXn

TRX (1-6)

AIU (1-3)

RFIFB

(1)

RFIFB

(1,2)

MCPA HUB

ECP

RF

MCPA sub-rack

RF sub-rack

I2C

Sub rack FAN

Sub rack FAN

AIUB

MCPA

(1-6)

SCB 1-2

SCB 1-2

Central fan (FCU)

Radio Unit (RU)

Filter Unit (FU)

RF ASC TMA

RET RET

ECP ASC TMA

Backplane removed

The RBS3 block diagram

RBS Architecture

• Control Base Unit (CBU) – Contains the functionality of the GPB, TUB, SCB and ETB.

• Radio Unit (RU) – Contains the functionality of the MCPA, TRX, the clipping of RFIF and part of the power backup capacity of the CU.

• Central fan – The 3 subrack fans are combined into one central fan at the top of the cabinet.

• Power Distribution Unit (PDU) – Contains circuit breakers, power backup capacity for the BB. Used instead of the CU and separate circuit breakers.

• Filter Unit (FU) – Replaces the AIUB. Uses an AUM instead of a DBM as its CPU.

• Radio Unit Interface board (RUIF) – Replaces the BBIF. Point to point connections via cables to the RUs.

RBS Architecture

GPB ETBPSU

ETB5 RAX

(18)

AIUBTRXnBBIFB(2)

RUIF(1,2)RAX

(1-9)

FU(1-6)

TXB(2)

CBU1-2

TXB(1,2)

Gamma

ATM

Timing

ECPGPB++

Timing

Digital sub-rack

Non-back-planeRF sub-rack(s)

AU-HUB

XALM

RU(1-6)

GPB ETB

RFASCTMA

RETRET

ECPASCTMA

I2C

PDU -48V

FCU(fan)

Optional unit

CPU types MP BP XP

The RBS 4b block diagram

Radio Configuration

Radio Configuration

2.1 GHz

1x1 – 3x1 2.1 GHZ or 850 MHz or 1900MHz

1x2 – 3x2Dual (850 + 1900)

1x2 – 3x2

1x1 + 1x1 – 3x1 + 3x1

New Board

New RBS4b Units

• CBU Control Basic Unit• RUIF Radio Unit Interface• RAXB Random Access and RX board• RU21 Radio Unit, 30W• RU22 Radio Unit, 40W• FU12 Filter Unit (850MHz, 1900MHz

& 2.1GHz)• PSU Power Supply Unit• PDU Power Distribution Unit• ACCU AC Connection Unit• DCCU DC Connection Unit• DCF DC-Filter• BFU Battery Fuse Unit • FCU Fan Control Unit• AUH Auxiliary Unit Hub

Re-used RBS3 Units

• TXB Transmitt Board• GPB General purpose Processor Board• XALM External Alarm Unit• ETB Exchange Terminal Board