TRDU&RRH introduction and Radio Test
Basic
CAO Guangyue
11/08/2009
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Agenda
1. TRDU and RRH introduction
2. Radio Fundamental
3. Radio performance test description
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TRDU and RRH introduction
 Overall description
 TRDU&RRH place in Node b system
 TRDU&RRH redio configuration and architecture overview
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1 – TRDU&RRH introduction
Overall TRDU&RRH description
 From the function point of view, TRDU&RRH are same,
TRDU&RRH = TRM+PA+DDM, convert baseband digital signal to analog radio
signal, filter, amplify etc.
 TRDU or RRH + D2U(CCM and CEM) = BTS, CPRI interface.
 In our lab, we have Andrew TRDU and RRH, lucent RRH(40w,60w) .
 Both TRDU and RRH can support up to 3 adjacent carries, and didn’t support
OTSR and OTBR
O = Omni-Sectorial B = Bi-Sectorial S = Tri-Sectorial
 TRDU/RRH maximum output power at antenna connector
 In UA06 RRH can’t support daisy chain and repeater mode
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1 – TRDU&RRH introduction
TRDU/RRH place in Node b system, The following figure given an overview of the
node B system with TRDU/RRH module
CPRI links (Opt/Elec.)
xCOB
TRDU/RRH
CPRI
links
xCEM
TRDU/RRH
xCCM-p
TRDU/RRH
xCEM
xCCM-a
xCEM
TRDU/RRH
TRDU/RRH
TRDU/RRH
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1 – TRDU&RRH introduction
TRDU and RRH basic radio configuration (Note:TRDU support TMA)
Antenna
Main
TX :
F1, F2, F3
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RX main :
F1, F2,F3
Antenna
Div.
RX Div :
F1, F2,F3
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1 – TRDU&RRH introduction
TRDU or RRH architecture overview
TRDU/RRH
TX LO
Synth.
VSWR
Meter
Downlink
Base Band
Processing
(DPD,DUC,PPR)
CPRI
Slave
1,2288Gb/s
DAC
PA
DAC
CPRI
LNA
Antenna
Diversity
ADC
Uplink
Base Band
Processing
ADC
Power
DC
- 48V
AISG
IN
Antenna
Main
LNA
RX LO 1
Synth.
DC/DC
Converter
RX LO 2
Synth.
+12V
Power
AISG OOK
modulator
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1 – TRDU&RRH introduction
TRDU/RRH must be able to report the following radio measurement
• RTWP main
• RTWP div
• RTWP combined
• Transmit carrier power
TRDU/RRH must support VSWR monitor
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2 Radio fundamental overview
Radio fundamental
•
Radio protocol, channel and network elements
• Radio frame structure, Scrambling and OVSF code
• Basic radio measurement: RSSI, ISCP, RSCP, Ec/No, Ioc/Ior, SIR,SNR...
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2 Radio fundamental overview
Radio protocol : radio interface protocol architecture is described in TS 25.301
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2 Radio fundamental overview
Control plan
• Layer 3 : RRC protocol located in RNC and UE. Call management, radio mobility
management,measurement control and reporting, outer loop power control (TS25.331)
• Layer 2 : RLC and MAC,except MAC-hs in BTS, Layer located in RNC and UE, RLC: TM,AM,UM,
segmentation, buffering, ciphering. MAC: data transfer, Multiplexing of logical channel,priority
handling/scheduling (TFC selection), Ciphering (if no perform in RLC)(TS25.322,25.321)
• Layer 1 : physical layer located in BTS and UE(TS25.211-215).physical layer :Multiplexing of
transport channel(CCTrCh), spreading/de-spreading,modulation/de-modulation, RF process,
synchronization, measurement…
User plan
• PDCP only for PS domain, contains compression method, BMC (TS25.323,25.324)
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2 Radio fundamental overview
RB (Radio bear) and RAB (Radio Access Bear)
RB->SRB:carry L3 signaling and NAS,TRB carry traffic. RB is the service provided
by a protocol entity for transfer of data, RB are mapped successively on logical
channel, transport channel and physical chennels
RAB provides confidential transport of signaling and user data between UE and CN
with the appropriate Qos
One RAB can be divided on RAB sub-flows and each sub-flow is mapped on one
RB, each sub-flow can have its own channel coding ,e.g voice call
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2 Radio fundamental overview
Radio channel :(RLC) logical channel, (MAC) transport channel,(L1) physical
channel
FDD cell downlink channel
AICH,PICH,CPICH,SCH are pure physical channel, and No transport channel
mapped on it.
Except BCH, transport channel have an ATM bear on Iub interface (path,CID,FP
TS25.425,25.427)
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2 Radio fundamental overview
FDD cell uplink channel
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2 Radio fundamental overview
A simple example of physical layer procedure: 12.2AMR+3.4K
12.2 parameter TRB
3.4 parameter SRB
(No multiplexing of dedicated channel on MAC,No MAC header is required) multiplexing of DCCH need C/T file in MAC header
12.2+3.4
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2 Radio fundamental overview
Radio frame structure
BTS receive data from RNC by FP and after channel coding each transport block is split of 10 ms.
Each radio frame is also split in to 15 time slot.
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2 Radio fundamental overview
Scrambling Code
UL scrambling code: used for separation of UE,No need for code planning(too many codes),two kind of scrambling: long
and short scrambling, Now we only use long scrambling, short scrambling is for multi user detected.
DL scrambling code: used for separation of cell, Need code planning. Now one cell have only one scrambling, secondary
scrambling code didn’t use. Total 8192 scrambling code, and divide 512 scrambling code group. In order to
accelerate UE cell search, 512 primary scrambling code group divide into 64 group according secondary synch
codes
Scrambling code is simple chip x chip multiplication.
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2 Radio fundamental overview
OVSF : the channeliazation are OVSF (orthogonal Variable Spreading Factor) codes.
The length of channelization code equal to SF (spreading factor), The longer channelization code the lower data rate and
the more gain. The channelization code transforms every data symbol into a number of chips, thus it can increase the
bandwidth of the signal. And UTRAN choose the adequate SF to match the bit rate.
The channelization codes can be defined in a code tree, which is shared by several users
If one code is ussed is used by a physical channel, the codes of underlying branchs may not be used.
Now we have only one code tree per cell, if two code trees are used, it is necessary to use the secondary scrambling.
Code resource allocation algorithms is located in RNC
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2 Radio fundamental overview
RSSI, ISCP, RSCP, Ec/No, Ioc/Ior, SIR,SNR...
1 RSSI/RWTP: UL received signal strength indicator, including thermal noise, reference point : antenna connector
2 ISCP : Interference Signal Code Power Interference on the received signal, measured after despreading
3 RSCP (Ec): Received Signal Code Power measurement on the received signal on P-CPICH channel, measured after despreading
4 SIR :Signal to Interference Ration SIR = DPCCH Ec/Io * SF
5 SNR: signal to noise ratio. No=UL RSSI=Ioc+Ior+Nth SNR = DPCCH Ec/No * SF
6 Ior = sum of all signal from UE, Ioc = sum of all signals from other UEs, Io = No – Ior * A
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3. Radio performance test description
UIIV Radio performance test
 UIIV radio performance test are different with BTS sub-system
radio test And our test didn’t cover BTS conformance
test(25.141).we focus on E2E system performance under different
radio channel conditions, also include association radio feature test,
such as HSPA+ etc
UIIV radio performance test environment and platform
Test tool : SR5500 use for simulating different radio profile,such
as multi-path, doppler frequency shift,fading..
some post process sofeware tools: opera,QXDM/QCAT,CDMx,
blueshark,XCLA etc
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