Ericsson WCDMA RAN Overview September 03, 2007 BANDUNG
Nov 01, 2014
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