FRHE Description

1 (18) FLEXI MULTIRADIO FlexiQuattro RRH4x4 2.6GHz

Confidential

Copyright 2013 Nokia Siemens Networks. All rights reserved.

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


No part of this publication may be copied, distributed, transmitted, transcribed, stored in a retrieval system, or translated into any human or computer language without the prior written permission of Nokia Siemens Networks.

The manufacturer has made every effort to ensure that the instructions contained in the documents are adequate and free of errors and omissions. The manufacturer will, if necessary, explain issues, which may not be covered by the documents. The manufacturer's liability for any errors in the documents is limited to the correction of errors and the aforementioned advisory services.

The documents have been prepared to be used by professional and properly trained personnel, and the customer assumes full responsibility when using them. The manufacturer welcomes customer comments as part of the pro-cess of continual development and improvement of the documentation in the best way possible from the user's viewpoint. Please submit your comments to the nearest Nokia Siemens Networks sales representative.

Nokia Siemens Networks and the wave logo are registered trademarks of Nokia Siemens Networks. Other com-pany and product names mentioned herein may be trademarks or trade names of their respective owners.


Confidential


Table of contents

1 Introduction ....................................................................................... 3

1.1 Scope ............................................................................................................................. 3

2 General description ........................................................................... 4

2.1 HW architecture ............................................................................................................. 42.2 Carrier Configuration Mode ............................................................................................ 5

3 Performance and functional split between design blocks .................. 6

3.1 RF frequency range ....................................................................................................... 63.2 MSR supporting ............................................................................................................. 63.3 TX RF Performance Requirements ................................................................................ 63.3.1 TX Output Power ............................................................................................................ 63.3.2 Adjacent Channel Leakage Ratio (ACLR) ...................................................................... 73.3.3 Spectrum Emission Mask (SEM) & Unwanted Emissions (UEM).................................... 73.3.4 Spurious Emission Requirement .................................................................................... 93.3.5 Frequency Error Requirement ...................................................................................... 103.3.6 Antenna Port Return Loss ............................................................................................ 103.4 RX Architecture ............................................................................................................ 113.5 RX RF Performance Requirement ................................................................................ 113.5.1 Reference Sensitivity.................................................................................................... 113.5.2 RX in-channel Selectivity .............................................................................................. 123.6 Temperature sensors ................................................................................................... 123.6.1 Overtemperature Safety Feature .................................................................................. 123.6.2 Startup and Operation .................................................................................................. 133.7 Power consumption ...................................................................................................... 13

4 External interfaces .......................................................................... 14

4.1 External Interfaces ....................................................................................................... 144.2 EAC Port ...................................................................................................................... 14

5 Mechanical construction ................................................................. 15

5.1 Dimensions .................................................................................................................. 15

6 TRX sub-assembly ......................................................................... 17

6.1 SFP modules ............................................................................................................... 176.2 Power Supply ............................................................................................................... 176.3 Antenna Line Support................................................................................................... 176.4 Main RF requirements for Antenna Filter DB ................................................................ 176.4.1 General requirements................................................................................................... 17


Confidential


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 oper-ating 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 sub-assemblies 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 speci-fied 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].


Confidential


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 al-so 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 aggrega-tion. 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 an-tenna 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 instantane-ous bandwidth of FRHD/FRHE is also 40MHz as transmitter. Instantaneous band-width(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 con-ditions 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.

5 (18)

Confidential

External connection from RRH to system module is implemented with OBSAI RP3 copatible optical RP3-01 interface. 2 optical interfaces are connect to system module. A third optical interface also provided here to support chaining. Chaining feature will requiware support. This interface carries all user data, clock references, and control data (Ethernet) between RRH and System module. RP3system module release 2 and 3.

4 external alarm inputs are supported with EAC

2.2 Carrier Configuration Mode

Table 2-2 RRH Level Configuration

Suggested (Combine all antenna ports effects

indexSignal

BW

LTE 20

MHz

LTE15

MHz

1 40 2

2 40

3 40 1

4 40

5 35 1 1

6 30 1

7 30 2

8 30 1

9 30

10 25 1

11 20 1

12 20 1

13 20

14 20

15 20

FLEXI MULTIRADIO FlexiQuattro RRH4x4 2.6GHz

om RRH to system module is implemented with OBSAI R01 interface. 2 optical interfaces are connect to system module. A third

ical interface also provided here to support chaining. Chaining feature will require sofThis interface carries all user data, clock references, and control data

(Ethernet) between RRH and System module. RP3-01 interface shall be compatible withsystem module release 2 and 3.

s are supported with EAC interface and has separate OVP

Carrier Configuration Mode

RRH Level Configuration

Suggested RRH Configuration mode Combine all antenna ports effects)

LTE 10

MHz

LTE

5 MHz WCDMA

2Tx 4Tx Spectrum

y y

4 y y

4 y y

8 y y

y y

1 y y

y y

2 y y

1 4 y y

1 y y

y y

1 y y

2 y y

1 2 y y

4 y y

om RRH to system module is implemented with OBSAI RP3 com-01 interface. 2 optical interfaces are connect to system module. A third

ining. Chaining feature will require soft-ces, and control data

01 interface shall be compatible with

arate OVP.


Confidential


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 fol-lows:

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 require-ments 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 ac-curacy are specified as below:

The output accuracy is +/- 1.3dB in normal conditions of room temperature over full sup-ported TX frequency range.

The output accuracy is +/- 2.0dB in extreme conditions over temperature over full supported TX frequency range.


Confidential


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 030 dB for using with MHA. LNA gain is set so that there will al-ways be 30 dB gain between the antenna and the RX DB without MHA.

The RX DB provides RF functionality for maximum 40MHz instantaneous bandwidth re-ception.

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

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 selectiv-ity

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

Sensitivity power level [dBm]

3GPP Limits(**) NSN guaranteed Limits

5 FRC A1-3 in Annex A.1 -101.5 -104.5


Confidential


E-UTRA channel bandwidth [MHz]


Sensitivity power level [dBm]

3GPP Limits(**) NSN guaranteed Limits

10 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 sec-tion 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)


Wanted sig-nal mean power [dBm]

Interfering signal mean power [dBm]

Type of interfer-ing 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


Confidential


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 suffi-cient 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 condi-tions. But CSSA FPGA is spec-ed lower operating temperature at -35C. In order to guar-antee 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 con-trol 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 reg-isters off. CSSA FPGA enters normal start process. CSSA FPGA internal cold-start func-tion 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

4x30W 2x30W

Typical [email protected] OPA Typical [email protected] OPA

Total w/o RET 711.2 W 816.6 W 414.4 W 473.0 W

MHA/RET 30.0 W 60.0 W 30.0 W 60.0 W

Total w/ MHA 741.2 W 876.6 W 444.4 W 533.0 W

DC Pin w RET 845.7 W 1000.1 W 507.1 W 608.1 W

OPA means Output Power Accuracy.


Confidential


4 External interfaces

4.1 External Interfaces

Table 4-1: External Interfaces

Name com-ments

# Level Connected Connector type I/O

DC * 1 -48V, 48RTN

System module (084849A) I

Antenna connector TX/RX 4 RF Antenna line 7/16 I/O

RF external connector RX ext. 2 RF QMA O

Optical interface Optical IF 3 Optics System module SFP I/O

LMP LMP 1 Tester in produc-tion

2x15 pin header I/O

EAC 1 d-sub MDR-14 I

RET RS-485 1 8-pole circular I/O

*Power supply shall be reverse polarity protected. Max input cable length 200m with induct-ance 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 fol-low.

7 6 5 4 3 2 1

GND GND EXT_ALARM(1) GND GND EXT_ALARM(0) GND

GND 5V_EAC GND EXT_ALARM(3) GND GND EXT_ALARM(2)

14 13 12 11 10 9 8


Confidential

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 con-nectors 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


Confidential


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.


Confidential


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 fil-ter DB doesnt 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 to-tal 60W power to external MHA/RCU. According to AISG 2.0 specification and 3GPP stand-ards, the MHA and RET components power consumption is budgeted as:

6.4 Main RF requirements for Antenna Filter DB

6.4.1 General requirements


Confidential


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 Operating band

TX Pass Band Bandwidth 50MHz 55MHz

RX Frequency Range 2520 2570 MHz 2500 2555 MHz Rx Operating band

RX Pass Band Bandwidth 50MHz 55MHz

Duplex Separation 120 MHz 120 MHz

RX

Noise figure (at 30dB gain)

2.60 dB 2.60 dB Worse case

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

TX

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

TX pass band insertion loss

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

EXT RX

RxEXT Gain 20dB 20dB (at max RX gain of 30dB)

RxEXT gain Accuracy +/-2dB +/-2dB

RxEXT NF 15 dB (high gain mode)

FRHE Description

Documents

Transcript of FRHE Description