SDR Link Budget.pdf

7/23/2019 SDR Link Budget.pdf

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SDR Link Budget


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1 SDR Equipment

Summary

This chapter mainly introduces family members of currently used SDR

equipment: BS8800, BS8900, BS8700 (B8200+R8860) and outdoor micro

BS8906 G060.

For this chapter, parameters of several main RF units need to be

understood.

1.1 Introduction to Family Members of SDR Equipment

At present, the family members of SDR equipment mainly are: indoor

macro BS8800, outdoor macro BS8900, distributed BS8700 (B8200+R8860)

and outdoor micro BS8906 G060.

All above mentioned BTSs have the same BBUs (base band unit), and

they all adopt baseband pool unit B8200; for RF part,

RU02/RU02A/RU60/RSU60 can be used both on BS8800 and BS8900. Inaddition, the outdoor micro BTS can only adopt RSU70, and the RF unit of

distributed BTS can only adopt R8860.

1.1.1 BS8800

BS8800 is a new generation indoor dual-mode macro BTS which adopts

multi-carrier and SDR technology. ZXSDR BS8800 GU360 provides completely

new solution for hybrid networking of GSM/UNTS and network evolution. It can

be widely applied under such environments as dense urban areas, urban areas,

suburban areas, remote suburban areas and highway.

BS8800 is divided into two parts: BBU & RF. The BBU refers to the base

band pool B8200 build in the rack. RF unit consists of dual-density carrier

RU02 and RU02A as well as multi-carrier technology based RU60 and RSU60.

Those modules can be both used on BS8800 and BS8900. BBU and RF unit

will be further introduced in following chapters.


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In addition, the fan module and power distribution module are also placed

in the rack, wherein, the power distribution module is a passive module playing

the role of power switch. The sketch map of BS8800 rack is as follows:

Figure 1-1 Structure Chart for BS8800 Rack

The sketch map for various modules and antenna connection in the rack is

as follows:


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Figure 1-2 Sketch Map for Wiring in BS8800 Rack

For BS8800, each RF module is directly connected to FS board of BBU via

optical fiber.

BS880 supports GPS synchronization. When adopting GPS signal for

synchronization, GPS processing module is built on CC board with GPS

antenna interface provided on the board. GSP antenna is placed outside the

cabinet and connected to CC board of BBU via feeder cable.

RF unit and BTS antenna are also connected via feeder cable.

1.1.2 BS8900

BS8900 is a new generation outdoor multimode macro BTS which adopts

multi-carrier and SDR technology. ZXSDR BS8900 GU360 provides completely

new solution for hybrid networking of GSM/UNTS and network evolution. It can

be widely applied under such environments as dense urban areas, urban areas,

suburban areas, remote suburban areas and highway.


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BS8800 also adopts the same RF and base band separation structure with

BS8800. And its BBU and RF units all can be used on BS8800.

BS8900 is composed by outdoor RF cabinet, site supporting cabinet and

battery cabinet. The following figure shows several composition ways of

BS8900 rack.


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Figure 1-3 Typical Configuration of BS8900: BC8910+RC8911

Figure 1-4 Typical Configuration of BS8900: BC8910+RC8911+RC8931

Figure 1-5 Side-by-side Cabinet of BS8900: BC8910+RC8910+PC8910


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1.1.3 BS8700 (B8200+R8860)

BS8700 composed by base band unit B8200 and RF unit R8860 can

support remote RF. A single site can support 6 cells at maximum, and can

support networking in chain topology, star topology and hybrid topology. For

chain networking, an optical fiber can support 4 cascade tiles at maximum, and

the maximum distance between BBU and the last RRU is 40km.

Figure 1-6 Sketch Map for Chain Networking of B8200+R8860 Distributed BTS

1.1.4 BS8906 G060

BS8906 features small volume, light weight, low cost and flexible

configuration, and is mainly used in outdoor micro BTS scenario, indoor micro

BTS scenario and indoor distribution. It is suitable for outdoor small capacity

application, non-equipment room environment, hot spot area coverage, blind

spot area (e.g.: tunnel) coverage and margin network application.

BS8900 is designed with RF and base band separation structure. Its base

band module can be in common use with that of indoor macro BS8800, and the

RF module adopted is generally RSU60. Single cabinet of BS8906 can support

6 carriers at maximum, and the site capacity can also be extended via

connecting with additional R8860.

BS8906 is convenient for installation, and occupies little area. It can be

installed in multiple ways including pole-mounting, wall-mounting and

floor-fixation manner (via standing bracket).


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Figure 1-7 Appearance of BS8906

1.2 Introduction to SDR BBU (Base Band Unit)

The BBU of SDR base station is B8200, and B8200 GU360 is a G/U

supported BBU.

1.2.1 Introduction to Structure and Board Functions of B8200

BBU (Base Band Unit) consists of control and clock board (CC), fabric

switch board (FS), base band processing board (UBPG for GSM, BPC for

UMTS), site alarm board (SA), site alarm extension board (SE, optional),

Network Interface Board for STM-1 (NIS, optional), power module (PM) and fan

module (FAM).


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Figure 1-8 Sketch Map for BBU (B8200)

Board Name Board Function Introduction

CC Control & Clock Board

FS Fabric Switch Board

UBPG Universal Baseband Processing board for GSM

BPC Baseband Processing Board for UMTS

SA Site Alarm Board

SE Site Alarm Extension Board

NIS Network Interface of STM-1

PM Power ModuleFAM FAN Module

Table 1-1 Main Boards in BBU of ZXSDR BS8800

Caution:

For two network standards GSM and WCDMA, different baseband boards need

to be configured which are respectively UBPG and BPC. A UBPG can process

12-channel baseband signals. When only a piece of FS board is configured, aB8200 can be configured with 5 pieces of baseband boards with 60-channel

baseband signals supported at maximum.

1.2.2 Capacity Indexes of B8200

TRXs supported at maximum for GSM: 60 TRX (single UBPG can support

12 TRXs, and totally 5 boards can be configured)

CSs supported at maximum for UMTS: 15 CS (single BPC board can

support 3 CS, and totally 5 boards can be configured).

1.3 Introduction to Main Modules of SDR RF Unit

The RF unit of SDR BTS consists of five RF modules, which respectively

are RU02, RU02A, RU40, RU60, RSU60 and R8860. Wherein, RU40 is a

UMTS single-mode multi-carrier RF module which only works in 2100M

frequency band; RU02 and RU02A are all GSM single-mode dual-density

carriers, which can work under 900/1800M frequency band. RU02A can not be


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used for networking individually; RU60, R8860 and RSU60 are all based on

multi-mode multi-density carrier technology, and can work under 900/1800

frequency band with G/U dual modes supported. R886 is a MCPA-based

remote radio unit (RRU), and can form distributed BTS together with B8200.

1.3.1 RU40 (Only Applicable to UMTS 2100M)

1.3.1.1 Outward Appearance

RU40 is a single mode multi-carrier RF module only working under

2100MHz. It consists of multi-carrier power amplification module, transmission

module and duplex filter LNA, and can provide two-channel antenna interfaces

and two pairs of CPRI interfaces.

Figure 1-9 Sketch Map for Outward Appearance of RU40

1.3.1.2 Output Power

RU40 module can support 4 carriers at maximum, and the total cabinet-top

output power is 60W. For UMTS, the cabinet-top output power must be

ensured to be 20W per carrier, and a piece of RU40 supports 3 carriers.

RU40 is a multi-carrier RU module, it currently follows the principle ofequal power division for each carrier, and the total cabinet-top power is kept at

60W. For example, if 3 carriers are configured, the cabinet-top output power of

each carrier is 20W.

RU40 Power

Total PA Output Power (W) 85

Total Cabinet-top Output

Power (W)

60


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Table 1-2 Total Output Power of RU40

1.3.1.3 Working Frequency BandItem Index

Working Frequency Band UMTS: 2100 MHz

Table 1-3 Working Frequency Band of RU40

1.3.1.4 Sensitivity

Item Index

Sensitivity of Receiver -126.5dBm@UMTS Single Antenna

Reception

-129.2dBm@UMTS Dual Antenna

Reception

Table 1-4 Sensitivity of RU40 Receiver

1.3.2 RU60 (GSM/UMTS)


RU60 is a multi-carrier RF module, and it can work under GSM singlemode, UMTS single mode or GSM/UMTS hybrid mode via software setting.

Main interfaces on RU60 panel include antenna feeder interface, extended

RX interface as well as baseband fiber interface. Totally two antenna feeder

interfaces are available, one is RX/TX dual diplex interface, and the other is RX

interface. In addition, the panel is also equipped with two RX extended

interfaces, respectively for input and output of diversity reception signal. There

are also two fiber interfaces on the panel, one for connecting with the BBU, and

the other for cascading with other RU modules.


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Figure 1-10 Sketch Map for Outward Appearance of RU60


RU60 can be used for GSM single mode networking, UMTS single mode

networking or GU hybrid networking. The total PA output power is 83W

(GMSK)/60W (8PSK)/83W(UMTS); the total cabinet-top output power is 60W(GMSK)/40W (8PSK)/60W (UMTS).

Mode PA Output Power Cabinet-top Output Power

GSM GMSK 83W/ 8PSK 60W GMSK 60W/ 8PSK 40W

UMT

S83W 60W

Table 1-5 Total Output Power of RU60

When RU60 is used in GSM network, it can be configured with one to 6

TRXs via software setting. Under GMSK modulating mode, the total

cabinet-top output power is 60W; under 8-PSK modulating scheme, the

total cabinet-top output power is 40W.

The R8.2 and latter versions all can support independent configuration of

power for each carrier with following conditions satisfied:

1. All GSM TRXs configured in the same RF module have the same output

power.


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2. For power level adjustment, the adjustment granularity of each TRX must

be the same.

3. GSM TRX quantity power of each TRX + UMTS carrier power


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Table 1-8 Working Frequency Band of RU60

Caution:

At present, the working bandwidth of RU60 has a restriction of 10MHz.

Therefore, the frequency points configured on the same RU60 should be within

a range of 5MHz of the central frequency points.

1.3.2.4 Sensitivity

Item Indexes

Sensitivity of the Receiver -112 dBm@GSM single antenna

reception

-126.5dBm@UMTS single antenna

reception

-129.2dBm@UMTS dual antenna

reception

Table 1-9 Reception Sensitivity of RU60

1.3.2.5 Supporting Coverage Enhancement Technology

Supporting DDT/FWDR/IRC.

1.3.2.6 Supporting Frequency Hopping

Supporting baseband frequency hopping/RF frequency hopping.

1.3.3 RSU60 (GSM/UMTS)


RSU60 is a multi-carrier RF module, and it can work under GSM single

mode, UMTS single mode or GSM/UMTS hybrid mode via software setting.

Main interfaces on RSU60 panel include antenna feeder interface,

extended RX interface as well as baseband fiber interface. Totally two antenna

feeder interfaces are available, one is RX/TX dual diplex interface, and the

other is RX interface. In addition, the panel is also equipped with two RX

extended interfaces, respectively for input and output of diversity reception

signals. There are also two fiber interfaces on the panel, one for connecting

with the BBU, and the other for cascading with other RU modules.


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Figure 1-11 Sketch Map for Outward Appearance of RSU60


RSU60 can support GSM/UMTS dual mode. The total cabinet-top output

power is 80W (GMSK)/50W (8PSK).

Mode Cabinet-top Output Power

GSM GMSK 80W/ 8PSK 50W

Table 1-10 Total Output Power of RSU60

When RU60 is used in GSM network, it can be configured with one to 6

TRXs via software setting. Under GMSK modulating scheme, the total

cabinet-top output power is 80W; under 8-PSK modulating scheme, the

total cabinet-top output power is 50W.

The R8.2 and latter versions all can support independent configuration of

power for each carrier with following conditions satisfied:

1. All GSM TRXs configured in the same RF module have the same output

power.

2. For power level adjustment, the adjustment granularity of each TRX must

be the same.

3. GSM TRX quantity power of each TRX + UMTS carrier power


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RSU60 80W

GSM: 9 levels

(10W/12W/15W/20W/25W/30W/40W/60W/80W)

UMTS: 20W/30W/40W

Table 1-11 Carrier Power Allocation of RSU60 under R8.2

Caution:

For GSM network, the cabinet-top output power under 8PSK modulation

scheme is about 2dB lower than that under GMSK modulation scheme.

1.3.3.3 Working Frequency Band

Item Indexes

Working Frequency Band GSM: EGSM/900/1800MHz

Table 1-12 Working Frequency Band of RSU60

Caution:

At present, the working bandwidth of RSU60 has a restriction of 15MHz.

Therefore, the frequency points configured on the same RSU60 should be

within a range of 7.5MHz of the central frequency points.

1.3.3.4 Sensitivity

Item Indexes

Receiver Sensitivity -112 dBm@GSM single antenna

reception

Table 1-13 Reception Sensitivity of RSU60

1.3.3.5 Supporting Coverage Enhancement Technology

Supporting DDT/FWDR/IRC.

1.3.3.6 Supporting Frequency Hopping

Supporting baseband frequency hopping/RF frequency hopping.


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2 Link Budget for Typical SDR Sites

Summary

This chapter mainly introduces cabinet-top power and other parameters of

typical SZDR sites, the key point is to highlight the link budget differences with

traditional sites or specially noted parameters, and examples for link budget will

also be demonstrated.

To sum up, the link budget of SDR sites has three main differences in

comparison with that of traditional site:

Cabinet-top output power calculation method;

Consideration for feeder loss when RRU is installed close to the

antenna/platform under distributed networking mode;

Extra uplink/downlink gains under OTSR networking mode;

2.1 RU60

RU60 is a G/U dual mode multi-density RF unit which can support GSM

single frequency, UMTS single frequency, GSM dual frequency and G/U dual

mode networking. The link budget difference between RU60 and traditional

BTS is the method for calculating cabinet- top power. The traditional 7/8, 5/4

or 1- 5/8 cables are taken as main feeder cables, and the feeder cable

calculation method is the same with that of traditional BTS.

2.1.1 Typical Sites Configuration

2.1.1.1 GSM Single Frequency Band Networking

2.1.1.1.1 S1~6

When a single sector has less than 6 TRXs or 6TRXs, each cell should be

configured with a RU60 and a pair of duplex & dual polarization antennas. The

number of BBU should be determined based on total number of physical

carriers in GSM network. And each UBPG board can support 12TRXs at

maximum.


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The total cabinet-top output power of each cell is 60W, and the power is

equally allocated to each TRX. For cabinet-top output power under different

carrier configurations of RU60, please refer to section Erreur ! Source du

renvoi introuvable. .

Select RU60-900 for 900MHz GSM independent networking, and select

RU60-1800 for 1800MHz GSM independent networking.

The antenna connection of RU60 is as shown in following figure:

Figure 2-1 1 to 6 GSM Carriers Configuration for RU60

2.1.1.1.2 S7~12

When one sector has more than 6 TRXs (7 to 12 TRXs/cell), each cellshould be configured with two RU60 modules but only one duplex &

dual-polarized antenna is needed. Two RU60 are bridged via extended RX

interface and no external combiner is needed. The configuration of BBU should

be determined based on total number of physical carriers in GSM network. And

each UBPG board can support 12TRXs at maximum.

For cabinet-top output power under different carrier configurations of RU60,

please refer to section Erreur ! Source du renvoi introuvable. .


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For example, if the cell is configured with 8TRXs, two RU60 are used with

4 carriers configured on each RU60, and the cabinet-top output power of each

carrier is 15W.



The specific antenna connection is as follows:

Figure 2-2 7 to 12 Carriers Configuration for RU60

2.1.1.1.3 S1~6 (DDT+FWDR)

When DDT and FWDR are adopted, each cell must be configured with two

RU60s, and two duplex & dual-polarized antennas are also needed. As two

RU6s transmit the same signals, the TRXs are logically thought as the same

TRX. At this time, the baseband board quantity needs to be calculated

according to the quantity of physical carriers, for example, for S4/4/4 under

DDT+FWDR mode, the quantity of baseband boards (two UBPG boards)

configured should be calculated as per 24TRXs.




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Antenna feeder connection under such mode is as shown in following

figure:

Figure 2-3 1 to 6 Carriers (DDT+FWDR) Configuration for RU60

2.1.1.2 UMTS Single Frequency Band Networking

2.1.1.2.1 1~3 C1S

For UMTS single frequency band networking, one RU60 can support 4

carriers/sectors at maximum. To guarantee the cabinet-top output of 20W for

each carrier, each RU60 can support 3 carriers/sectors at maximum. Under

3C1S conditions, only a pair of duplex & dual-polarized antennas are needed,

the BBU can be configured as per quantity of UMTS sectors, and each BPC

board can support 3 CS at maximum.

The total cabinet-top output power of each RU60 is 60W, and the output

power of each carrier should be guaranteed to be no less than 20W.


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Figure 2-4 1 to 3 Carriers Configuration in Each UMTS Sector for RU60

2.1.1.2.2 4~6 C1S

For UMTS single frequency band networking, to guarantee a cabinet-top

output power of 20W for each carrier, each RU60 can support 3

carriers/sectors at maximum. If each sector is configured with 4 to 6 carriers,

only a pair of duplex & dual-polarized antennas are needed, two RU60s are

bridged via extended RX interface, and no external combiner is needed. TheBBU should be configured as per quantity of UMTS sector, and each BPC

board can support 3 CS at maximum.

The total cabinet-top output power of each RU60 is 60W, and the power of

each carrier should be guaranteed to be no less than 20W.


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Figure 2-5 4 to 6 Carriers Configuration in Each UMTS Sector for RU60

2.1.1.3 GSM900/1800 Dual Frequency Band NetworkingThe configuration principle for dual frequency networking is the same with

that of single frequency networking and the differences is that each RU60

module can only support a frequency band; therefore, dual-frequency band cell

needs two RU modules at least, for example, for GSM900 S2+GSM1800 S2,

each cell needs to be configured with a RU60-900 and a RU60-1800. The

baseband board quantity is determined by total TRX quantity of dual frequency

band.

Please see section Erreur ! Source du renvoi introuvable. for

calculation of cabinet-top powers under GSM900/1800.

If the antenna feeder configuration should be jointly shared, an external

bandwidth combiner is also needed.


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Figure 2-6 GSM900/1800 Dual Frequency Band Networking for RU60 (Antenna Unshared)

2.1.1.4 GSM/UMTS Dual Mode Networking2.1.1.4.1 G/U CO-Frequency Band Configuration

For G/U co-frequency band, the RU60 module can be jointly shared, S2

(GSM) + S2 (UMTS) or S4 (GSM) + S1 (UMTS) are supported, and the

antenna feeder and antenna are all shared. UBPG and BPC should be

configured as per respective carrier quantities of GSM and UMTS network.

Please see section Erreur ! Source du renvoi introuvable. for

cabinet-top power of each carrier under G/U hybrid mode.

Figure 2-7 Configuring S2 (G) + S2 (U) or S4 (G) + S1 (U) by RU60 under G/U Co-Frequency Band Conditions

As shown in the figure, the cabinet-top power of GSM carrier is 10W and

the cabinet-top power of UMTS carrier is 20W.


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Figure 2-8 Configuring S8 (G) + S2 (U) or S4 (G) + S4 (U) by RU60 under G/U Co-Frequency Band Conditions

As shown in above figure, the cabinet-top power of GSM carrier is 10Wand the cabinet-top power of UMTS carrier is 20W.

Figure 2-9 Configuration of the Site with Maximum Capacity by RU60 under G/U Co-Frequency Band Conditions

for BS8800

As shown in above figure, under G/U co-frequency band conditions,

BS880 adopts RU60 as RF module, which can support the configuration of

S666(G)+S333(U) or S888(G)+S222(U) at maximum. The cabinet-top power of

GSM carriers is 10W, and the cabinet-top power of UMTS carriers is 20W.

2.1.1.4.2 G/U Inter-frequency Band Configuration

Under G/U inter-frequency conditions, G/U needs to be configured with

independent RU module. For example, for GSM1800+WCDMA900,

RU60-1800 and RU60-900 should be respectively configured, and independent

feeder cable and antenna should also be used, as shown in following figure. If

broadband antenna is needed, additional external broadband combiner should

also be used.

The configuration principle of G/U baseband board is unchanged, and the

board number is still calculated as per carrier quantities of G/U.


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Figure 2-10 G/U Inter-Frequency Band Configuration for RU60

2.1.2 Link Budget Examples

Caution:

All following link budget results can only be taken as reference, and should not

be quoted in link budget of any project, as the estimation result is of no

usability and is not informative. Any one who quotes the estimation result

directly in any specific project will undertake corresponding result.

Hypothesis:

Following four sections introduce some link budget examples. For G/U hybrid

mode and G mode, only link budget for GSM network is introduced. And the

link budgets are all under conditions of 900M frequency band, common urban

area (MU), adopting Okumura-Hata module, antenna mounting height

supposed to be 25m, and 7/8 main feeder cable.


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For GSM900/1800 dual frequency networking and G/U inter-frequency

networking, the link budget needs to be conducted respectively. Please refer to

following link budget examples.

2.1.2.1 GSM900 S2 & S3

RU60 2TRX RU60 3TRXEGSM/900M,MU EGSM/900M,MU

UpLink DownLink UpLink DownLinkTX Rank-top Output Power(dBm) 33.00 44.77 33.00 43.01DDT (dB) 0.00 0.00Total Cable Loss (dB) 2.22 2.22 2.22 2.22Feeder Loss (dB) 1.16 1.16 1.16 1.16Jumper Loss (dB) 0.56 0.56 0.56 0.56Connector Loss (dB) 0.30 0.30 0.30 0.30Lightening rod Loss (dB) 0.20 0.20 0.20 0.20TMA Insertion Loss (dB) 0.00 0.00TX Antenna Gain (dBi) 0.00 17.00 0.00 17.00EIRP (dBm) 33.00 59.55 33.00 57.79

Antenna Diversity Gain (dB) 3.00 3.00RX Sensitivity (dBm) -112.00 -102.00 -112.00 -102.00TMA Contribution to Sens. (dB) 0.00 0.00RX Antenna Gain (dBi) 17.00 0.00 17.00 0.00FWDR (dB) 0.00 0.00IRC (dB) 0.00 0.00Acceptance Level (dBm) -73.00 -73.00Log-Normal Margin (dB) 8.70 8.70Allowed Max Path Loss (dB) 125.08 123.85 125.08 122.09Uplink-Downlink (dB) 1.23 2.99Limited DL Limited DL LimitedAllowed Max Path Loss (dB) 123.85 122.09SSdesign (dBm) -64.30 -64.30SSacceptance (dBm) -73.00 -73.00BTS Antenna Height (m) 25.00 25.00

MS Antenna Height (m) 1.50 1.50 Area Coverage Probability 95% 95%Cell Radius (km) 0.90 0.80

Table 2-1 Link Budget for GSM S2 and S3 Type Sites Configuration by RU60

It can be seen from above table that when configuring GSM900 S2 and S3

type sites by RU60, only the cabinet-top output power is different, and all other

link budget parameters are the same. For S2-type site, the cabinet-top power is


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30W (44.77dBm) and for S3-type site, the cabinet-top power is 20W

(43.01dBm).

2.1.2.2 GSM900 S2 (DDT+FWDR)

RU60 2TRX(DDT+FWDR)EGSM/900M,MU

UpLink DownLinkTX Rank-top Output Power(dBm) 33.00 44.77DDT (dB) 3.00Total Cable Loss (dB) 2.22 2.22Feeder Loss (dB) 1.16 1.16Jumper Loss (dB) 0.56 0.56Connector Loss (dB) 0.30 0.30Lightening rod Loss (dB) 0.20 0.20TMA Insertion Loss (dB) 0.00TX Antenna Gain (dBi) 0.00 17.00EIRP (dBm) 33.00 62.55

Antenna Diversity Gain (dB) 3.00RX Sensitivity (dBm) -112.00 -102.00TMA Contribution to Sens. (dB) 0.00RX Antenna Gain (dBi) 17.00 0.00FWDR (dB) 2.00IRC (dB) 0.00Acceptance Level (dBm) -73.00Log-Normal Margin (dB) 8.70Allowed Max Path Loss (dB) 127.08 126.85Uplink-Downlink (dB) 0.23Limited DL LimitedAllowed Max Path Loss (dB) 126.85SSdesign (dBm) -64.30SSacceptance (dBm) -73.00BTS Antenna Height (m) 25.00MS Antenna Height (m) 1.50

Area Coverage Probability 95%Cell Radius (km) 1.09

Table 2-2 Link Budget for GSM S2-type Sites (DDT+FWDR) Configuration by RU60

2.1.2.3 GSM900 S8

RU60 S8 (2*RU60)EGSM/900M,MU

UpLink DownLinkTX Rank-top Output Power(dBm) 33.00 41.76DDT (dB) 0.00


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Total Cable Loss (dB) 2.22 2.22Feeder Loss (dB) 1.16 1.16Jumper Loss (dB)

0.56 0.56Connector Loss (dB) 0.30 0.30Lightening rod Loss (dB) 0.20 0.20TMA Insertion Loss (dB) 0.00TX Antenna Gain (dBi) 0.00 17.00EIRP (dBm) 33.00 56.54

Antenna Diversity Gain (dB) 3.00RX Sensitivity (dBm) -112.00 -102.00TMA Contribution to Sens. (dB) 0.00RX Antenna Gain (dBi) 17.00 0.00FWDR (dB) 0.00IRC (dB)

0.00Acceptance Level (dBm) -73.00Log-Normal Margin (dB) 8.70Allowed Max Path Loss (dB) 125.08 120.84Uplink-Downlink (dB) 4.24Limited DL LimitedAllowed Max Path Loss (dB) 120.84SSdesign (dBm) -64.30SSacceptance (dBm) -73.00BTS Antenna Height (m) 25.00MS Antenna Height (m) 1.50


Table 2-3 Link Budget for GSM S8-type Site Configuration by RU60

For this case, S8 adopts two RU60, and each RU60 supports 4 carriers,

thus the cabinet-top power of each carrier is 15W (41.76dBm).

2.1.2.4 GSM900 S4+UMTS900 S1

S4 (G) + S1 (U)

EGSM/900M,MUUpLink DownLink

TX Rank-top Output Power(dBm) 33.00 40.00DDT (dB) 0.00Total Cable Loss (dB) 2.22 2.22Feeder Loss (dB) 1.16 1.16Jumper Loss (dB) 0.56 0.56Connector Loss (dB) 0.30 0.30Lightening rod Loss (dB) 0.20 0.20TMA Insertion Loss (dB) 0.00

TX Antenna Gain (dBi) 0.00 17.00


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EIRP (dBm) 33.00 54.78 Antenna Diversity Gain (dB) 3.00RX Sensitivity (dBm)

-112.00 -102.00TMA Contribution to Sens. (dB) 0.00RX Antenna Gain (dBi) 17.00 0.00FWDR (dB) 0.00IRC (dB) 0.00Acceptance Level (dBm) -73.00Log-Normal Margin (dB) 8.70Allowed Max Path Loss (dB) 125.08 119.08Uplink-Downlink (dB) 6.00Limited DL LimitedAllowed Max Path Loss (dB) 119.08SSdesign (dBm) -64.30SSacceptance (dBm) -73.00BTS Antenna Height (m) 25.00MS Antenna Height (m) 1.50


Table 2-4 Link Budget for Configuring GSM900 S4+UMTS900 S1 by one RU60

For GSM900 S4+UMTS900 S1, the cabinet-top power of four GSM

carriers is 10W, and the cabinet-top power of UMTS carriers is 20W.

2.2 RSU60


2.2.1.1 GSM Single Frequency Band Networking

2.2.1.1.1 S1~6

When a single sector has less than 6 or 6 TRXs, each cell should be

configured with one RSU60 and a pair of duplex & dual-polarized antennas.

The BBU should be configured as per total number of physical GSM carriers,

and each UBPG board can support 12 TRXs at maximum.

The cabinet-top output power of each cell is 80W, and the power is equally

allocated to each TRX. For cabinet-top output power under different carrier

configurations of RU60, please refer to section Erreur ! Source du renvoi

introuvable. .


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Select RSU60-900 for 900MHz GSM independent networking, and select

RSU60-1800 for 1800MHz GSM independent networking.

The antenna feeder connection of RU60 is as shown in following figure:

Figure 2-11 S1 to 6 Carriers Configuration for RSU60

2.2.1.1.2 S7~12

When a single sector has more than 6 TRXs (7 to 12 TRXs/cell), each cell

needs to be configured with two RSU60 modules and only one duplex &

dual-polarized antenna is needed. Two RSU60 are bridged via extended RX

interface and no external combiner is needed. The BBU should be configured

as per total number of physical GSM carriers, and each UBPG board can

support 12 TRXs at maximum.



For example, when a cell is configured with 8 TRXs, two RSU60 should be

used, each one is configured with 4 carriers, and each carrier has a cabinet-top

output power of 20W.


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The specific antenna connection is as shown as follows:

Figure 2-12 7 to 12 Carriers Configuration for RSU60

2.2.1.1.3 S1~6 (DDT+FWDR)

When DDT and FWDR are adopted, each cell must be configured with two

RSU60s, and two duplex & dual-polarized antennas are also needed. As those

two RSU60 transmit the same signals, the TRXs are thought as the same TRX

logically. At this time, the quantity of the baseband board needs to be

calculated as per the quantity of physical TRX, for example, for S4/4/4 underDDT + FWDR mode, the baseband board (two UBPG boards) quantity should

be calculated as per 24 TRXs.

For cabinet-top output power under different carrier configurations of

RSU60, please refer to section Erreur ! Source du renvoi introuvable. .



The specific antenna connection is as shown as follows:


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Figure 2-13 1 to 6 Carriers Configuration (DDT + FWDR) for RSU60

2.2.1.2 GSM900/1800 Dual Frequency Band Networking

The configuration principle of dual frequency band networking is the same

with that of single frequency band networking, and the difference is: as each

RSU60 module can only support a frequency band, the dual frequency cell

needs two RU modules at minimum. For example, for GSM900 S2+GSM1800

S2, each cell needs to be configured with a RSU60-900 and a RSU60-1800.

And the baseband board quantity is calculated as per total TRX quantity under

dual frequency mode.

For cabinet-top power calculation of GSM900/1800, please refer to section

Erreur ! Source du renvoi introuvable. .

If the antenna feeder configuration needs to be jointly shared, an external

broadband combiner is also needed.


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Figure 2-14 RSU60 GSM900/1800 Dual Frequency Networking (Antenna Unshared)

2.2.2 Link Budjet Examples

Caution:





Hypothesis:

900M frequency band, common urban area (MU), adopting Okumura-Hata

module, antenna mounting height supposed to be 25m, and 7/8 main feeder

cable.

For GSM900/1800 dual frequency band networking, the link budget needs

to be conducted respectively; please refer to following link budget examples.


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2.2.2.1 S2/S4/S8

RSU60 S2 RSU60 S4

RSU60

S8(2*RSU60)EGSM/900M,MU EGSM/900M,MU EGSM/900M,MUUpLink DownLink UpLink DownLink UpLink DownLink

TX Rank-top Output Power(dBm) 33.00 46.02 33.00 44.77 33.00 44.77DDT (dB) 0.00 0.00 0.00Total Cable Loss (dB) 2.22 2.22 2.22 2.22 2.22 2.22Feeder Loss (dB) 1.16 1.16 1.16 1.16 1.16 1.16Jumper Loss (dB) 0.56 0.56 0.56 0.56 0.56 0.56Connector Loss (dB) 0.30 0.30 0.30 0.30 0.30 0.30Lightening rod Loss (dB) 0.20 0.20 0.20 0.20 0.20 0.20TMA Insertion Loss (dB) 0.00 0.00 0.00TX Antenna Gain (dBi) 0.00 17.00 0.00 17.00 0.00 17.00EIRP (dBm) 33.00 60.80 33.00 59.55 33.00 59.55

Antenna Diversity Gain (dB) 3.00 3.00 3.00RX Sensitivity (dBm) -112.00 -102.00 -112.00 -102.00 -112.00 -102.00TMA Contribution to Sens. (dB) 0.00 0.00 0.00RX Antenna Gain (dBi) 17.00 0.00 17.00 0.00 17.00 0.00FWDR (dB) 0.00 0.00 0.00Acceptance Level (dBm) -73.00 -73.00 -73.00Log-Normal Margin (dB) 8.70 8.70 8.70Allowed Max Path Loss (dB) 125.08 125.10 125.08 123.85 125.08 123.85Uplink-Downlink (dB) -0.02 1.23 1.23Limited UL Limited DL Limited DL LimitedAllowed Max Path Loss (dB) 125.08 123.85 123.85SSdesign (dBm) -64.30 -64.30 -64.30SSacceptance (dBm) -73.00 -73.00 -73.00BTS Antenna Height (m) 25.00 25.00 25.00MS Antenna Height (m) 1.50 1.50 1.50

Area Coverage Probability 95% 95% 95%Cell Radius (km) 0.76 0.70 0.70

Table 2-5 Link Budget for GSM S2 and S3 Configuration by RSU60

It can be seen from above table that when configuring GSM900 S2, S4

and S8 type sites by RSU60, only the cabinet-top output power is different, and

all other link budget parameters are the same. For S2 type site, the cabinet-top

power is 40W (46.02dBm) and for S4 type site, the cabinet-top power is 20W

(43.01dBm)

2.2.2.2 S2 (DDT+FWDR)

RSU60S2(DDT+FWDR)


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EGSM/900M,MUUpLink DownLink

TX Rank-top Output Power(dBm) 33.00 46.02DDT (dB) 3.00Total Cable Loss (dB) 2.22 2.22Feeder Loss (dB) 1.16 1.16Jumper Loss (dB) 0.56 0.56Connector Loss (dB) 0.30 0.30Lightening rod Loss (dB) 0.20 0.20TMA Insertion Loss (dB) 0.00TX Antenna Gain (dBi) 0.00 17.00EIRP (dBm) 33.00 63.79

Antenna Diversity Gain (dB) 3.00RX Sensitivity (dBm) -112.00 -102.00TMA Contribution to Sens. (dB) 0.00RX Antenna Gain (dBi) 17.00 0.00FWDR (dB) 2.00Acceptance Level (dBm) -73.00Log-Normal Margin (dB) 8.70Allowed Max Path Loss (dB) 127.08 128.09Uplink-Downlink (dB) -1.01Limited UL LimitedAllowed Max Path Loss (dB) 127.08SSdesign (dBm) -64.30SSacceptance (dBm) -73.00BTS Antenna Height (m) 25.00MS Antenna Height (m) 1.50


Table 2-6 Link Budget for GSM S2 (DDT + FWDR) by RU60

2.3 BS8700 (R8860 + B8200)

B8200+R8860 constitute to distributed BS8700, namely BBU + RRU mode.

It can be widely used for coverage of special scenarios including indoor, tunnel,

high-speed railway, highway, dense urban area and other areas. RF remote

mode poses lower requirements for the equipment room, and R8860

local-antenna installation can save feeder cable loss and provides more flexible

site deployment scheme. BBU is generally placed indoor and connected to

RRU via optical fiber.


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B8200 and R8860 networking can be in star topology, chain topology and

hybrid topology.

For star networking, two FS board are configured to provide 12 optical

interfaces for connecting with 12 RRUs;

For chain networking, currently the maximum cascade depth of RRU is 4

tiles;

For hybrid networking, 48 RRUs can be supported at maximum.

The networking topology structure for B8200 & RNC/BSC as well as RRU

is as shown in following figure:

Figure 2-15 Sketch Map for Networking of B8200, RNC/BSC and RRU


The typical site configuration of R8860 is consistent with that of RU60, and

the conversion method of cabinet-top power is also the same. No more details

are provided here repeatedly. The link budget difference with RU60 is that the

feeder cable loss needs to be re-considered after adopting R8860 RF remote

mode.

Herein under introduction to antenna feeder connection of R8860 under

conventional configurations are given.

2.3.1.1 Each Pair of Antennas Connected with One RRU

When each pair of dual-polarized antennas is connected to one RRU, the

RX/TX and RX interfaces of RRU are respectively connected to two interfaces

of the dual-polarized antennas.

Emission channel: RX/TX interface of RRU.


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Reception channel: main set reception comes from RX/TX interface and

diversity reception comes from RX interface.

Figure 2-16 Each Pair of Antennas Connected with One RRU

2.3.1.2 Each Pair of Antennas Connected with 2 RRUs

When each pair of dual-polarized antennas is connected to two RRUs, the

RX/TX interfaces of each RRU are respectively connected to two interfaces ofthe dual-polarized antennas. Secondly, for two RRUs, connect the RXOUT

interface of RRU1 with RXIN interface of RRU2, and connect the RXIN

interface of RRU1 with RXOUT interface of RRU2.

Emission channel: two RRU2 transmit signals via respective RX/TX

interfaces.

Reception channel: two RRUs collect main set reception signals via their

respective RX/TX interfaces, and the diversity reception signals are gained


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through connecting RXOUT interface of one RRU with RXIN interface of the

other.

Figure 2-17 Each Pair of Antennas Connected with 2 RRUs

2.3.2 Feeder Cable Loss Consideration

2.3.2.1 RRU Installed Close to Antenna

Under permissible conditions (such as tower load bearing, wind speed and

other factors), RRU can be installed close to the antenna, RRU and BBU are

connected via optical fiber, and RRU and an tenna are connected via 1/2 soft jumper.

Under such conditions, the feeder cable loss only refers to the loss of 1/2

soft jumper between RRU and the antenna as well as the loss between two

connectors. The 1/2 feeder cable is generally at the length o f 2m, or can be

configured as per actual conditions. And no lightning arrester is configured

under such conditions.


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Figure 2-18 Sketch Map for Antenna Installed Close to the RRU

For example, for near antenna installation of R8860-900, RRU and the

antenna are connected via 1/2 super soft jumper at a length of 2M, under such

conditions, the feeder cable loss is 11.2/100*2+2*0.05=0.32dB. No lightning

arrester is configured under such conditions.

Caution:

Whether the RRU can be installed close to the antenna should be understood

by communicating with the market department in tendering process, and the

link budget can then be made accordingly.

2.3.2.2 RRU Installed Close to the Platform

If the conditions are non-permissible, the RRU can only be installed on the

tower platform (the platform below the antenna) or on the roof platform. Under

such conditions, the RRU and BBU are still connected via optical fiber; the

RRU and the antenna are connected in conventional mode: 1/2 sof t jumper at

both ends + main feeder cable (7/8, 5/4 or 1 -5/8 feeder cable). The length of

the main feeder cable is equal to the height from RRU to the antenna, and the

length of two 1/2 soft jumpers is generally 22m=4m. Under such conditions,

the lightning arrester should be configured.


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Figure 2-19 Sketch Map for RRU Installed Close to the Platform

Summary table for feeder cable loss (taking Hansen product for an

example):

Feeder Type 900M 1800M Unit

1/2 Jumper 11.2 16.6dB/100

m

7/8 Feeder 3.88 5.75

dB/100

m

5/4 Feeder 2.77 4.16

dB/100

m

1-5/8 Feeder 2.29 3.47

dB/100

m

Fiber 0 0

dB/100

m

Table 2-7 Summary Table for Hansen Feeder Cable Loss

The connector loss is 0.05 dB/piece.

MountHeight

of Antenna

(m)

PlatformMountingHeight ofRRU (m)

Lengthof 7/8Main

FeederCable

(m)

Lengthof 1/2Soft

Jumper(m)

Connector 900M(dB)1800M

(dB)

50 0 50 4 6 2.89 4.0450 10 40 4 6 2.5 3.46


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50 20 30 4 6 2.11 2.8950 30 20 4 6 1.73 2.3150 40 10 4 6 1.34 1.7450 50 0 2 2 0.32 0.43

Table 2-8 Examples for Feeder Cable Loss at Different RRU Mounting Heights

Prompt:

If the RRU can not be installed close to the antenna, its location should be

understood by communicating with the market department in tendering process,

including details related to the height of the tower platform for placing RRU. And then the feeder cable length and loss can be calculated according to the

height of the platform when making link budget.

2.3.3 Application of Multi-carrier Association

Multi-carrier association is a product imported from OTSR of 3G into GSM,

it permits a logical cell to have antennas at multiple positions and multiple

angles and adopts multiple RRUs for transmitting the same carrier on different

antennas. It is different with traditional STSR networking, and is suitable to be

used for dense urban areas with complex transmission environment (such as

Hong Kong) as well as high speed mobile scenarios (such as high-speed

railway, highway). It can greatly reduce inter-cell handover/reselection, and is

in favor of enhancing network performance and subscriber acknowledgement.

Terminology explanation:

STSR: Sectorized TX Sectorized RX (each cell has only one coverage area

with repeater system excluded). Such networking mode is the networkingmode for conventional omni-directional site or N-sectorized directional site.

OTSR: Omni TX Sectorized RX (each cell is allowed to have multiple different

coverage areas). Such networking mode allows one logical cell to have

multiple antennas placed at different locations and different angles. OTSR can

be implemented by traditional power splitter or by SDR multi-carrier unite

combine mode.


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MCUM (Multi Carrier Unite Combine): it refers to connection of M RRUs and N

pairs of antennas (M is a multiple of N, and the value can be 1, 2 .), the

carriers of all those RRUs belong to the same cell, the downlink emission

signals of multiple RRUs are completely the same, and selectable combination

is performed in the downlink process.

Explanations to differences between traditional 3-sectors STSR and OTSR

are given as follows by analyzing following two figures.

2.3.3.1 STSR Example

The following figure is a sketch map for configuring a STSR-3 sector intoS8/8/8. Each sector supports 8-TRXs and is configured with two RRUs. Each

RRU is configured with 4 TRXs. The antenna direction of Cell 1 is 30 degrees,

Cell 2 60 degrees, and Cell 3 90 degrees.

The first RRU of each sector is connected with FS board of BBU, and the

second RRU of each sector is in cascade with the first RRU via optical fiber.

Each UBPG board can process 12-channel baseband signals. As S8/8/8 STSR

totally has 24 TRXs, thus 2 UBPG boards are needed.


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Figure 2-20 Sketch Map for Configuring STSR-3 Sector into S8/8/8

2.3.3.2 Example for Implementing OTSR Function Via Traditional Power SplitterThe power splitter mode is applicable to any BTS. For example, when

B8018 is configured into OTSR-2 02 type site with 2 TRXs, the cabinet-top

power is 20W. As the power splitter is used, the power is reduced to 10W with

3dB power splitter loss.

To implement OTSR by power splitter, an extra 3dB loss is caused, thus

the cabinet-top power is half reduced.

Figure 2-21 Implementing OTSR by Power Splitter

2.3.3.3 Example for Implementing OTSR Via MCUM (Multi Carrier Unite Combine)

To configure OTSR-2 O2 type site by MUCM mode, two R8860 are

configured, and each R8860 is configured with 2 TRXs. The cabinet-top output

power is 30W. To implement OTSR by MCUM mode will not cause extra loss.


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Figure 2-22 Implementing OTSR by MCUM

The following figure is a sketch map for configuring OTSR-3 sector into 08

type site by MCUM function. The angles of the three antennas are the same

with above mentioned conditions, which are respectively 30 degrees/60

degrees/90 degrees, and the three antennas (Antenna 1, Antenna 2 and Antenna 3) can be placed in three different places rather than in the same

position, but the three antennas belong to the same logical Cell 1.

Each Antenna is connected to two RRUs with 8 TRXs supported, but those

8 TRXs are completely same in three antenna directions, thus the capacity of

Cell 1 is not O24 but O8. 8 TRXs in each antenna direction are configured with

completely the same frequency points, thus can be seen as the same emission

signal which acquires downlink transmit diversity gains. At the same time, as

the uplink signals are received via different antennas, the selectablecombination can bring a certain uplink diversity gains.

The first RRU connected with each antenna is connected with FS board of

BBU via optical fiber, and the second RRU is in cascade with the first RRU via

optical fiber. Although the actual capacity of Cell 1 is O8, as the baseband part

still needs to process 38=24 baseband signals, the quantity of UBPG board is

2 pieces.


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Figure 2-23 Sketch Map for OTSR-3 O8

Note:

In the above figure, X, X and X correspond to the same carrier transmitted by

Antenna1/2/3.

Caution 1:

For OTSR networking, the quantity of UBPG board can not be calculated

according to actual logic capacity of OTSR BTS but according to the quantity of

physical carriers configured. In the above example, one OTSR-3 O8-type site

has logic capacity of 8 TRXs, but the number of actual physical carrier is

83=24, thus it should be configured with 2 UBPG boards. Another examplerefers to a OTSR-5 (five directional antennas) O10-type site, the actual UBPG

board quantity should be calculated according to the number of physical

carriers: 510=50, and totally 5 UBPG boards should be configured.


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Caution 2:

For OTSR, the same carrier must be implemented on the same UBPG board. For OTSR-5 O10-type site shown in following figure, each UBPG board is

actually configured with 2 logic carriers (2), the other eight TRXs (2/2/2/2)

are the same signals with (2), and the actual number of physical carriers

configured on each UBPG board is 10. Five UBPG boards can not be

configured into the format of 10+10+10+10+10.

Figure 2-24 Sketch Map for OTSR-5 O10

Caution 3:

For OTSR networking, the hardware quantities of RRU and UBPG need to be

increased. A traditional 08-type site needs two RRUs and one UBPG board.

However, for a OTSR-3 08-type site, six RRUs and two UBPG boards are

needed.

For influences of MCUM on coverage/capacity/frequency planning/network

performance and applicable special scenarios, please refer to the article of

Special Subject Research---Analysis for Application of GSM SDR Equipment in

OTSR Networking .


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2.3.4 Factors to be Considered for OTSR Link Budget

In downlink direction, as multiple antennas transmit the same signal, the

incoherent emission energy is input for countermining poor C/I caused by

multipath effect, acquiring a certain downlink emission diversity gains valued at

2dB.

In uplink direction, the same logic cell has multiple antennas for diversity

reception, after processing via MRC combination, it can be thought as having

acquired 2dB 4-channel diversity reception gains.

2.3.5 Link Budget Examples

Caution:





2.3.5.1 Link Budget for STSR Networking

Hypothesis:

900M frequency band, common urban area (MU), adopting Okumura-Hata

module, antenna mounting height supposed to be 25m, case 1: R8860 is not

placed on the tower, and RRU and the antenna are connected via 7/8 main

feeder cable; case 2: R8860 is installed on the tower and close to the antenna,

and the loss of the 2m 1/2 super soft jumper cable should be taken into

consideration.

R8860 2TRX R8860 2TRXEGSM/900M,MU EGSM/900M,MU

UpLink DownLink UpLink DownLinkTX Rank-top Output Power(dBm) 33.00 44.77 33.00 44.77DDT (dB) 0.00 0.00Total Cable Loss (dB) 2.03 2.03 0.32 0.32Feeder Loss (dB) 0.97 0.97 0.00 0.00Jumper Loss (dB) 0.56 0.56 0.22 0.22Connector Loss (dB) 0.30 0.30 0.10 0.10


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Lightening rod Loss (dB) 0.20 0.20 0.20 0TMA Insertion Loss (dB) 0.00 0.00TX Antenna Gain (dBi)

0.00 17.00 0.00 17.00EIRP (dBm) 33.00 59.74 33.00 61.45 Antenna Diversity Gain (dB) 3.00 3.00RX Sensitivity (dBm) -112.00 -102.00 -112.00 -102.00TMA Contribution to Sens. (dB) 0.00 0.00RX Antenna Gain (dBi) 17.00 0.00 17.00 0.00FWDR (dB) 0.00 0.00Acceptance Level (dBm) -73.00 -73.00Log-Normal Margin (dB) 8.70 8.70Allowed Max Path Loss (dB) 125.27 124.04 126.98 125.75Uplink-Downlink (dB) 1.23 1.23Limited DL Limited DL LimitedAllowed Max Path Loss (dB) 124.04 125.75SSdesign (dBm) -64.30 -64.30SSacceptance (dBm) -73.00 -73.00BTS Antenna Height (m) 25.00 25.00MS Antenna Height (m) 1.50 1.50

Area Coverage Probability 95% 95%Cell Radius (km) 0.91 1.02

Table 2-9 Link Budget for Tower-off Installation and Near-Antenna Installation of R8860

2.3.5.2 Link Budget for MCUM Configuration (OSTR Networking)

Hypothesis

900M frequency band, high density urban area (HMU), adopting

Okumura-Hata module, and antenna mounting height supposed to be

25m.When R8860 is installed on the tower at a position near to the antenna,

the loss of the 2m 1/2 super soft jumper cable should be taken into

consideration. MCUM (three antenna directions) and traditional 3-sector BTS

can be respectively adopted.

R8860 STSR 2TRX R8860 OTSR 2TRXEGSM/900M,DU EGSM/900M,DU

UpLink DownLink UpLink DownLinkTX Rank-top Output Power(dBm) 33.00 44.77 33.00 44.77Tx Diversity (dB) 0.00 2.00Total Cable Loss (dB) 0.32 0.32 0.32 0.32Feeder Loss (dB) 0.00 0.00 0.00 0.00

Jumper Loss (dB) 0.22 0.22 0.22 0.22


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Connector Loss (dB) 0.10 0.10 0.10 0.10Lightening rod Loss (dB) 0 0 0 0TMA Insertion Loss (dB)

0.00 0.00TX Antenna Gain (dBi) 0.00 17.00 0.00 17.00EIRP (dBm) 33.00 61.45 33.00 64.45

Antenna Diversity Gain (dB) 3.00 3.00RX Sensitivity (dBm) -112.00 -102.00 -112.00 -102.00TMA Contribution to Sens. (dB) 0.00 0.00RX Antenna Gain (dBi) 17.00 0.00 17.00 0.00FWDR (dB) 0.00 2.00Acceptance Level (dBm) -73.00 -73.00Log-Normal Margin (dB) 8.70 8.70Allowed Max Path Loss (dB) 126.98 125.75 128.98 127.75Uplink-Downlink (dB) 1.23 1.23Limited DL Limited DL LimitedAllowed Max Path Loss (dB) 125.75 127.75SSdesign (dBm) -64.30 -64.3SSacceptance (dBm) -73.00 -73BTS Antenna Height (m) 25.00 25MS Antenna Height (m) 1.50 1.5

Area Coverage Probability 95% 95%Cell Radius (km) 1.02 1.16

Table 2-10 Link Budget for R8860 STSR & OTSR Application

SDR Link Budget.pdf

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