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Flexi Remote RF Head 4Tx 4Rx
FRHD/FRHE 2.6GHz
FRHD: Upper 50MHz Sub-band
FRHE: Lower 55MHz sub-band
HW Description

Nokia Siemens Networks

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Table of contents
1
Introduction ....................................................................................... 3
1.1
Scope ............................................................................................................................. 3
2
General description........................................................................... 4
2.1
2.2
HW architecture ............................................................................................................. 4
Carrier Configuration Mode ............................................................................................ 5
3
Performance and functional split between design blocks .................. 6
3.1
3.2
3.3
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.4
3.5
3.5.1
3.5.2
3.6
3.6.1
3.6.2
3.7
RF frequency range ....................................................................................................... 6
MSR supporting ............................................................................................................. 6
TX RF Performance Requirements ................................................................................ 6
TX Output Power............................................................................................................ 6
Adjacent Channel Leakage Ratio (ACLR) ...................................................................... 7
Spectrum Emission Mask (SEM) & Unwanted Emissions (UEM).................................... 7
Spurious Emission Requirement .................................................................................... 9
Frequency Error Requirement ...................................................................................... 10
Antenna Port Return Loss ............................................................................................ 10
RX Architecture ............................................................................................................ 11
RX RF Performance Requirement ................................................................................ 11
Reference Sensitivity.................................................................................................... 11
RX in-channel Selectivity.............................................................................................. 12
Temperature sensors ................................................................................................... 12
Overtemperature Safety Feature .................................................................................. 12
Startup and Operation .................................................................................................. 13
Power consumption ...................................................................................................... 13
4
External interfaces .......................................................................... 14
4.1
4.2
External Interfaces ....................................................................................................... 14
EAC Port ...................................................................................................................... 14
5
Mechanical construction ................................................................. 15
5.1
Dimensions .................................................................................................................. 15
6
TRX sub-assembly ......................................................................... 17
6.1
6.2
6.3
6.4
6.4.1
SFP modules ............................................................................................................... 17
Power Supply ............................................................................................................... 17
Antenna Line Support................................................................................................... 17
Main RF requirements for Antenna Filter DB ................................................................ 17
General requirements................................................................................................... 17
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1
Introduction
1.1 Scope
Scope of this document is to specify Flexi MultiRadio Remote Radio Head (RRH) 2.6 GHz
Band VII (FRHD/FRHE) HW architecture. The FRHD/FRHE is a variant of 4T4R Flexi
Quattro RRH platform so that it will be designed reuse as much as possible of FRIG RRH
4x4 1.7/2.1GHz.
The Flexi Quattro is a Multi-Standards Radio(MSR) platform. It is be capable of supporting
single-RAT WCDMA [Error! Reference source not found.] mode, single-RAT LTE [2]
mode or multi-RAT WCDMA+ LTE [4] mode. FRHD/FRHE currently only need support
single-RAT LTE.
FRHD frequency operating range covers upper 50MHz of band 7. FRHE frequency operating range covers lower 55MHz of band 7. These two variants can fully cover 70MHz full
band 7 frequency range with 35MHz spectrum overlap.
In this document, external interfaces and sub-assemblies are specified. Based on this
document, implementation specifications and requirement specifications of subassemblies can be written.
The FRHD/FRHE RRH can share most parts of FRIG requirements specified in DOORS
except for some frequency band specific requirements which could refer to FRHC, a
2.6GHz RFM variant. These requirements are mainly stored in ‘WCDMA_LTE RF HW’,
‘ElectroMechanics’ and ‘RF Performance’ three formal modules.
In addition, this document specifies those design block requirements, which are not specified in DOORS and also gives requirements, which apply to several design blocks.
SW architecture and SW functionalities are not in the scope of this document, but can be
found in RF MODULE SW PROGRAM ARCHITECTURE SPECIFICATION [27].
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2
General description
2.1 HW architecture
The FRHD/FRHE RRH implements RF processing functionality according to Flexi BTS
Product Architecture [Error! Reference source not found.]. The RRH shall fulfill 3GPP
requirements of a Band category 1, Category B, Multi-Standards Radio BTS. The RRH also meet 3GPP requirements of Category B, LTE, Wide Area BTS.
RRH module is a stand-alone fully operational fanless transceiver unit. It includes full radio
functionality, including transmitter and receiver parts, and related digital signal processing
like DUC, DDC and DAPD. The unit has four independent transceivers (each transceiver
is called a pipe), each composed of one DL chain and one independent UL chain. The 4
pipes TRX HW are ready to support LTE advanced 4x4 MIMO multiple antenna aggregation. The unit integrates antenna filter unit that contains four filter blocks, each composed
of one duplex filter and LNA. The unit provides four antenna connectors for the BTS antenna line. RF performance requirements of 3GPP are valid at antenna ports of the RRH.
Each pipe in FRHD/FRHE RRH supports multimode and supports up to 4 carriers of LTE
with maximum 40MHz Transmission instantaneous bandwidth. The channel bandwidth
can be 5MHz, 10MHz, 15MHz or 20MHz for each LTE carrier. The receiving instantaneous bandwidth of FRHD/FRHE is also 40MHz as transmitter. Instantaneous bandwidth(IBW), also called real-time bandwidth, refer to the maximum continuous RF signal
bandwidth presented at antenna port that a Transmitter or Receiver pipe can handle.
Each transceiver (pipe) can be configured independently to single or multi carrier modes.
Supported transmit power per pipe is 30W, 20 W, 15W, 10W and 8W. The temperature
range for each power output is given in the following NSN internal guideline "Thermal conditions for design" V5 of Mar. 2012.
Table 2-1 Ambient Temperature Range and Conditions
Case
Parameter
T (°C) Note!
1
Maximum Operational Temperature
55
At constant high ambient temperature maximum output power might be
limited
2
Minimum Operational Temperature
-40
There shall not be artificial limitations to prevent operation below -40C
3
Minimum Cold Start Test Condition
-50
In case of failure a separate PM decision is needed if -50C is needed to
support
4
Maximum Indoor temperature
45
This is specific limit for RRH
5
Maximum temperature in sun (GR-487-Core)
50
For RRH wind is assumed
6
Maximum outdoor temperature in shade
55
For RRH wind is assumed
7
Derating temperature
40
For RRH 3 m/s wind is assumed and 70% traffic used
Wind cooling shall be considered for all outdoor cases listed in table above. The wind
shall improve RRH temperature by 10c.
Solar loading negatively impact thermal by ~5C for outdoor cases.
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External connection from
om RRH to system module is implemented with OBSAI R
RP3 co
compatible optical RP3-01
01 interface. 2 optical interfaces are connect to system module. A third
optical
ical interface also provided here to support chaining.
ining. Chaining feature will require
requi softsof
ware support. This interface carries all user data, clock references,
ces, and control data
(Ethernet) between RRH and System module. RP3-01
RP3 01 interface shall be compatible with
system module release 2 and 3.
4 external alarm inputss are supported with EAC interface and has separate
arate OVP.
OVP
2.2 Carrier Configuration Mode
Table 2-2
RRH Level Configuration
Suggested RRH Configuration mode
(Combine
Combine all antenna ports effects
effects)
LTE
15
MHz
LTE
10
MHz
index
Signal
BW
LTE
20
MHz
1
40
2
2
40
3
40
4
40
5
35
1
6
30
1
7
30
8
30
9
30
10
25
1
11
20
1
12
20
13
20
2
14
20
1
15
20
LTE
2Tx
4Tx
y
y
y
y
4
y
y
8
y
y
y
y
y
y
y
y
2
y
y
4
y
y
1
y
y
y
y
y
y
y
y
2
y
y
4
y
y
5 MHz
WCDMA
4
1
1
1
2
1
1
1
1
Spectrum
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3
Performance and functional split between design
blocks
This chapter makes the division of RRH level performance requirements to sub-block level.
The functional split between sub-blocks is also explained here.
3.1 RF frequency range
FRHD/FRHE RRH operates on 3GPP FDD band 7. UL and DL frequency ranges are as follows:
FRHD: Upper 50MHz of Band VII
o
UL: 2520..2570 MHz
o
DL: 2640..2690 MHz
FRHE: Lower 55MHz of Band VII
o
UL: 2500..2555 MHz
o
DL: 2620..2675 MHz
3.2 MSR supporting
The FRHD/FRHE RRH is compliance to MSR Band Category 1 RF performance requirements defined in 3GPP TS 37.141 chapter 5. FRHD/FRHE only need to support Single-RAT
LTE(Capability Set 2)
FRHD/FRHE RRH will support contiguous usage follow 3GPP rel9 standard, also support
3GPP non-contiguous usage follow 3GPP rel10.
3.3 TX RF Performance Requirements
3.3.1 TX Output Power
The FRHD/FRHE target output power is 30W(44.78dBm) per transmitter.
On considering the TX filter insertion loss variant at passband edge, the TX output power accuracy are specified as below:
The output accuracy is +/- 1.3dB in normal conditions of room temperature over full supported TX frequency range.
The output accuracy is +/- 2.0dB in extreme conditions over temperature over full supported
TX frequency range.
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3.4 RX Architecture
RX consists of the RF Front-end RX part and the RX DB. BTS site shall support 12 dB
masthead amplifier (MHA) with 1-5 dB feeder loss and 30 dB MHA with 1-7 dB feeder
loss. The RF Front-end RX part includes the antenna filter and the adjustable gain LNA.
LNA gain can be set to 0…30 dB for using with MHA. LNA gain is set so that there will always be 30 dB gain between the antenna and the RX DB without MHA.
The RX DB provides RF functionality for maximum 40MHz instantaneous bandwidth reception.
3.5 RX RF Performance Requirement
Receiver DB calculations include 30dB LNA gain.
Table 3-7 FRHD/FRHE performance requirements, case E-UTRA
Note!
Receiver frequency
2500-2570MHz
Carrier frequency raster
100 kHz
Duplex spacing
120 MHz
Input impedance
50 Ω
Input return loss
13 dB min. with MHA installing
15dB min. without MHA installing
Sensitivity, static, no div,
See Table 3-8
Dynamic range
See Error! Reference source not found.
In-channel selectivity
See Table 3-9
Adjacent channel selectivity
See Error! Reference source not found.
Blocking
See Error! Reference source not found. and
Error! Reference source not found.
Intermodulation
See Error! Reference source not found., Error!
Reference source not found.
3.5.1 Reference Sensitivity
Table 3-8. NSN and 3GPP E-UTRA sensitivity levels.
E-UTRA channel
bandwidth [MHz]
Reference measurement
channel
5
FRC A1-3 in Annex A.1
Sensitivity power level [dBm]
3GPP Limits(**)
NSN guaranteed Limits
-101.5
-104.5
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E-UTRA channel
bandwidth [MHz]
Reference measurement
channel
10
Sensitivity power level [dBm]
3GPP Limits(**)
NSN guaranteed Limits
FRC A1-3 in Annex A.1*
-101.5
-104.5
15
FRC A1-3 in Annex A.1*
-101.5
-104.5
20
FRC A1-3 in Annex A.1*
-101.5
-104.5
Note*: PREFSENS is the power level of a single instance of the reference measurement channel.
This requirement shall be met for each consecutive application of a single instance of
FRC A1-3 mapped to disjoint frequency ranges with a width of 25 resource blocks each
Note**: 3GPP Limits shall be the Psense to calculate wanted signal degradation level in later section 3.6.5 – 3.6.7 except for the co-located blocking requirement Error! Reference
source not found..
3.5.2 RX in-channel Selectivity
Table 3-9. RX in-channel selectivity.
E-UTRA
channel
bandwidth
(MHz)
Reference measurement
channel
Wanted signal mean
power [dBm]
Interfering
signal mean
power [dBm]
Type of interfering signal
5
A1-2 in Annex A.1 [2]
-100.0
-81
5 MHz E-UTRA
signal, 10 RBs
10
A1-3 in Annex A.1 [2]
-98.5
-77
10 MHz E-UTRA
signal, 25 RBs
15
A1-3 in Annex A.1 [2]*
-98.5
-77
15 MHz E-UTRA
signal, 25 RBs
20
A1-3 in Annex A.1 [2]*
-98.5
-77
20 MHz E-UTRA
signal, 25 RBs
Note*:
Wanted and interfering signal are placed adjacently around Fc
3.6 Temperature sensors
3.6.1 Overtemperature Safety Feature
The RRH has the ability to gradually reduce power or shutdown in case of overtemperature
or thermal runaway. The overtemp algorithm uses the worst-case reading (pipe or module, as
appropriate) to track temperature and apply a TX pipe power reduction or unit shutdown if the
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worst-case temperature exceeds the specified threshold. In case of SW algorithm or temp
sensor failure, HW shutdown of PSU exists as final protection. Once unit has cooled to sufficient level, supplies come up and unit resets and operates as normal.
FRHD/FRHE over temperature protection feature succeed FRIG over temperature protection
algorithm at link
3.6.2 Startup and Operation
FRHD/FRHE is requested cold start as low as -50C for Russia customer in extreme conditions. But CSSA FPGA is spec-ed lower operating temperature at -35C. In order to guarantee it is configured and timing good, some additional high power resistors are placed
close to CSSA FPGA on PWB aim to heating this ASIC. A temperature monitor and control circuit shall control heating resistors on below -35C or even a little higher when taking
into account temperature detection error. During heating period this control circuit also
hold CSSA FPGA reset pin until the CSSA FPGA ambient temperature raise to safe
startup temperature.
The temperature control circuit then release CSSA FPGA reset pin and switch heating registers off. CSSA FPGA enters normal start process. CSSA FPGA internal cold-start function is no necessary to use and shall be disabled.
3.7 Power consumption
Current power consumption of FRHD/FRHE are based on FRHD X12 test data, summarized
in table below, the analysis worksheet attached.
Power Consumption
Typical
4x30W
Max@0.8dB OPA
Typical
2x30W
Max@0.8dB OPA
Total w/o RET
MHA/RET
711.2 W
30.0 W
816.6 W
60.0 W
414.4 W
30.0 W
473.0 W
60.0 W
Total w/ MHA
DC Pin w RET
741.2 W
845.7 W
876.6 W
1000.1 W
444.4 W
507.1 W
533.0 W
608.1 W
OPA means Output Power Accuracy.
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4
External interfaces
4.1 External Interfaces
Table 4-1: External Interfaces
comments
Name
DC *
#
Level
Connected
Connector type
I/O
1
-48V,
48RTN
System module
(084849A)
I
Antenna line
7/16
I/O
QMA
O
System module
SFP
I/O
Tester in production
2x15 pin header
I/O
1
d-sub MDR-14
I
1
8-pole circular
I/O
Antenna connector
TX/RX
4
RF
RF external connector
RX ext.
2
RF
Optical interface
Optical IF
3
Optics
LMP
LMP
1
EAC
RS-485
RET
*Power supply shall be reverse polarity protected. Max input cable length 200m with inductance less than 0.03 mH/km and resistance less than 1 ohm/km.
4.2 EAC Port
EAC port allows four TTL_5V external alarm inputs. The EAC port interface is shown as follow.
7
GND
GND
14
6
5
4
GND
EXT_ALARM(1)
GND
5V_EAC
GND
EXT_ALARM(3)
13
12
11
3
GND
GND
10
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2
1
EXT_ALARM(0)
GND
GND
EXT_ALARM(2)
9
8
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5
Mechanical construction
FRHD/FRHE electromechanical construction is presented in Error! Reference source not
found.. External interfaces are illustrated in Figure 5-1.
Figure 5-1. Interfaces of FRHD/FRHE RRH
The external interfaces are protected against dust and water to fulfill the classification IP65 –
with no water ingress allowed.
Handles for transport are required, fixed or removable. Mechanics shall be such that the connectors are safe when the RRH is placed on floor, connector side down, during transport and
installation.
Cooling method is natural convention. All external surfaces which can be touched with covers
in place, the maximum temperature shall be 70C.
5.1 Dimensions
Table 5-1 Physical dimensions and maximum weight.
Width
Max. 387 mm
Height (Front Panel to cores back side)
Max. 460 mm
Height (Including Handle and connectors)
Max. 605 mm
Depth (PA Partial)
Max. 167mm
Depth (Filter Partial)
Max. 139 mm
Volume of RRH
Max. 27L
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Weight of RRH
Max. 27 kg
Weight of Solar Cover
Max. 0.8 kg
Weight of Mounting Bracket
Max. 0.7 kg
Note: All dimensions do not include Flange, Screw Boss & Connectors. The tolerances
should be applied where no tolerances is specified in the table.
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6
TRX sub-assembly
This chapter presents design blocks in TRX sub-assembly.
6.1 SFP modules
SFP modules are used to convert the optical RP3-01 signal to electrical and vice versa.
FRHD/FRHE RRH has maximum three plug-in SFP module slots. Minimum one SFP module
can be used depending on the configuration and chaining.
6.2 Power Supply
The RRH supply normal input voltage shall range from -40.5 to -57V with -39+/-1.5V startup.
The RRH can fully optional in extended voltage range for at least 1hour period from -46 to 60V exclude the normal input voltage range. RRH powering is done by a distributed solution
which includes three isolated main DC/DC converters and housekeeping. The three main
DC/DC converters provide power for two PA sub-assemblies and one 15.5V common bus.
Surge protection, reverse polarity protection and EMC filtering components are shielded with
cast aluminum EMC shield.
6.3 Antenna Line Support
Antenna Filter FFHx sub-assembly provides three RET/AISG interfaces. One is RS-485
RET port. The other two are via Antenna 1 and Antenna 3 AISG modem. The antenna filter DB doesn’t include AISG/RET protocol processor. It only provides signal conversion
from TTL to OOK via AISG modem or TTL to RS-485. The protocol handling are done by
MERA1(for Ant1), MERA2(for RS-485) and MERA3(for Ant3).
The MHA/RET devices configuration could be:
1. Ant1(or Ant3): up to 4x RCUs (RET antennas control unit) via Bias-T, only one is
activated at same time
2. Ant1(or Ant3): dual band MHA + up to 4x RCUs via MHA RS-485 port, Only one
RCU is activated at same time.
3. Ant1(or Ant3): dual path MHA(another MHA RF port connect to Ant2) + up to 4x
RCUs via MHA RS-485 port, Only one RCU is activated at same time.
4. RS-485 port: up to 4x RCUs, only one is activated at same time.
The RRH RET power supply is 15.5V and the three AISG/RET interfaces share providing total 60W power to external MHA/RCU. According to AISG 2.0 specification and 3GPP standards, the MHA and RET components power consumption is budgeted as:
6.4 Main RF requirements for Antenna Filter DB
6.4.1
General requirements
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Table 6-1: General requirements for FFI_ antenna filter DB
Items
FFHD Specification
FFHE Specification
Note
General
(upper sub-band)
(lower sub-band)
TX Frequency Range
2640 – 2690 MHz
2620 – 2675 MHz
TX Pass Band Bandwidth
50MHz
55MHz
RX Frequency Range
2520 – 2570 MHz
2500 – 2555 MHz
RX Pass Band Bandwidth
50MHz
55MHz
Duplex Separation
120 MHz
120 MHz
Noise figure (at 30dB
gain)
≤ 2.60 dB
≤ 2.60 dB
Pass band gain
0 – 30 dB
Step size
adjustement:
1dB± 0.8dB
0 – 30 dB
Step size
adjustement:
1dB± 0.8dB
Pass band gain accuracy
± 1.0dB at 30dB gain
± 1.5dB at other gain
± 1.0dB at 30dB gain
± 1.5dB at other gain
IIP3
≥ 0 dBm
≥ 0 dBm
(with gain of 20-30 dB)
Input Compression Point
≥ - 20 dBm
≥ - 20 dBm
(at gain of 30 dB)
RX Group delay distortion
≤ 30ns
≤ 30ns
within any 5 MHz segment in inner
Rx op-passband
≤ 70ns
≤ 70ns
with 5 MHz segment from op-band
edge
Return loss antenna port
> 15 dB
> 15 dB
(RX high gain mode)
Return loss RX output
port
> 15 dB
> 15 dB
Return loss TX port (pass
band)
> 15 dB
> 15 dB
> 14 dB 1 MHz inwards from both TX
band edges
TX Group delay distortion
≤ 40ns
≤ 40ns
within any 5 MHz segment in inner
Tx op-passband
≤ 100ns
≤ 100ns
with 5 MHz segment from op-band
edge
≤ 0.9dB
≤ 0.9dB
within any 5 MHz segment in inner
Tx op-passband
≤ 1.3dB
≤ 1.3dB
at 5MHz segment from op-band edge
RxEXT Gain
20dB
20dB
(at max RX gain of 30dB)
RxEXT gain Accuracy
+/-2dB
+/-2dB
RxEXT NF
<2.7dB
<2.7dB
Return loss at RxEXT port
> 15 dB
> 15 dB
Tx Operating band
Rx Operating band
RX
Worse case
TX
TX pass band insertion
loss
EXT RX
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(high gain mode)