ZTE CDMA SDR BTS Solution Helps Operators to Reduce TCO - ZTE Corporation

8/13/2019 ZTE CDMA SDR BTS Solution Helps Operators to Reduce TCO - ZTE Corporation

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CDMA SDR BTS Solution Helps Operators to Reduce TCO - ZTE Corporation

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ZTE CDMA SDR BTS Solution Helps Operators to Reduce TCO

Introduction

For enterprises, making profit is a prerequisite for survival and development. Under the present

circumstances of global economic recession, all telecom operators, whether in developed or in

underdeveloped countries, are facing the challenge of making profit.

Figure 1 Users Number and ARPU in Developed and Emerging Markets

As shown in Figure 1, the developed markets see a sluggish growth of users number and the emerging

markets experience a decline of Average Revenue Per User (ARPU). The negative influence of economic

crisis impels the operators to reduce expenses so as to increase cash flow. The operators are paying

more attention to Total Cost of Ownership (TCO) and they are more likely to choose products and the

auxiliary solutions with low TCO. Therefore, ZTE focuses on helping the CDMA operators to reduce their

entire network TCO by introducing end-to-end solution.

Network TCO Analysis

To reduce TCO, it is necessary to have an understanding of the composition of TCO. Network TCO

consists of two parts: Capital Expenditure (CAPEX) and Operational Expenditure (OPEX). The CAPEX is

subdivided into purchase cost and network construction cost. And the OPEX is subdivided into operation

cost and maintenance cost.

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CDMA SDR BTS Solution Helps Operators to Reduce TCO - ZTE Corporation

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Figure 2 Network TCO Composition

Figure 2 shows the composition and the proportion of each part in the entire TCO. Apparently, the OPEX

accounts for the majority of the TCO and the maintenance cost is the main part of the OPEX. The

maintenance cost includes energy consumption expense, site rent and transmission resource rent.

ZTE CDMA SDR Low-TCO Solution

ZTE adheres to the low-TCO idea and takes measures to reduce TCO through the entire networklifecycle from network construction to network operation & maintenance and even capacity expansion and

evolution. Figure 3 illustrates the various network phases.

Figure 3 Division of Network Phases

Network Planning

To reduce the network TCO at network planning phase, the most effective way is to reduce the number of

sites provided that the network coverage and network capacity are satisfied. There are two kinds of

scenarios:

(1) The high densely and less densely populated urban areas, which are limited by capacity. In this case,

the large-capacity BTS can be used to reduce the number of sites.

(2) The suburban areas or farms, which are limited by coverage. In this case, the BTS providing wide

coverage can be used to reduce the number of sites.

Table 1 Method of Reducing TCO (Sites Number) at Network Planning Phase

Capacity Limited Scenario Coverage Limited Scenario

Technical

Advantage

Proportion of Sites

Reduced

Technical

Advantage

Proportion of Sites

Reduced

ZTE SDR BTS

supports a large

A traditional BTS supports

24 carrier-sectors. ZTE

ZTE SDR BTS

supports higher

Compared with a

traditional BTS that

8/13/2019 ZTE CDMA SDR BTS Solution Helps Operators to Reduce TCO - ZTE Corporation

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capacity. A single

SDR BTS

supports up to 48

carrier-sectors.

SDR solution can reduce

50% sites as compared to

traditional BTS solution.

transmit power. supports 20 W transmit

power, ZTE SDR BTS

supports 40 W transmit

power, reducing 33%

sites.

ZTE SDR BTS

supports new-

generation voice

coding technique

4GV.

ZTE SDR BTS solution

can reduce 30% sites.

ZTE SDR BTS

supports high-gain

antennas.

Compared with the

traditional solution, ZTE

SDR BTS solution can

reduce 28% sites with the

high-gain antennas.

ZTE SDR BTS

solution supports

the cell splitting

technique.

By splitting three sectors

into six sectors, ZTE SDR

BTS solution can increase

the cell capacity by at

most 70% and thus

reduce 40% sites.

ZTE SDR BTS

solution provides

distributed BBU

and RRU. The

RRU can be

mounted on a

tower.

Take a 50m-high tower

as an example. ZTE SDR

BTS solution can reduce

2 dB feeder loss. With the

same transmit power at

the top of the cabinet,

ZTE SDR BTS solution

can reduce 40% sites.

ZTE SDR BTS

solution supports

the four-antenna

receiver diversity

technique.

ZTE SDR BTS solution

can effectively reduce the

power consumption of

terminals, reducing 40%

sites.

ZTE SDR BTS

solution supports

higher reverse

receiver sensitivity.

ZTE SDR BTS can

reduce 37% sites by

increasing the reverse

receiver sensitivity by 4

dB.

Note: All the values are calculated as per certain link budget parameters at the network planning phase.

Network Construction

At network construction phase, costs for site acquisition, site construction, transport and installation

constitute the major part of CAPEX. Therefore, ZTE mainly focuses on the four aspects mentioned and

find solutions to reduce TCO at this phase.

Table 2 Reducing CAPEX at Network Construction Phase

Cost Indoor Outdoor Indoor

Site acquisition

cost

The SDR BTS can be installed

against the wall. The BBU can be

mounted in a standard 19-inch

rack to achieve zero footprint.

The integrated outdoor cabinet can

accommodate the power supply

transmission device, and so on to

eliminate the need of equipment

room.

Site

construction

cost

The BBU can be installed in a

standard 19-inch rack and the

RRU can be mounted on a tower,

thus saving 100% indoor

engineering expense.

The integrated outdoor cabinet can

be used to eliminate the need of

equipment room, thus reducing the

engineering expense.

Transport cost The SDR base station features small size and light weight. As all

modules are installed in the rack for transportation, 30% to 50%

transportation cost can be saved.

Installation cost The SDR base station features small size and light weight, saving 50%

installation and labor costs.

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In addition, ZTE also provides a series of competitive auxiliary solutions to reduce the cost. In the auxiliary

solution of a traditional base station, the tower, equipment room/shelter accommodating BTS, power

supply, transmission device and so on), generator and oil box are distributed, thus occupying a lot of

land. In the enhanced auxiliary solution, ZTE uses the outdoor integrated BTS and the following

accessories:

H pole. The antennas are installed at the top of the pole and the equipment is installed in the frame

of the pole. The precondition of this solution is that the pole should be easily constructed in the same

city/country.

Shelter. The shelter can be built under the tower to reduce its footprint.Integrated generator. The oil box can be directly installed on the bottom of generator to reduce the

footprint and construction cost. This solution is suitable for the customers who have no requirement

for the size of the oil box.

Network Operation & Maintenance

The network O & M cost accounts for the majority of the TCO. ZTE SDR BTS solution reduces the

network O & M cost in the following aspects:

Saving equipment room rent

As mentioned before, the indoor SDR BTS can be installed against wall. The BBU provides zero footprint

when it is installed in a standard 19-inch rack. The outdoor SDR BTS can accommodate power supply,transmission and so on, thus eliminating the need of shelter. Take the indoor application as an example to

have a simple cost comparison in Table 3.

Table 3 Comparison of Equipment Room Rent

Rent Traditional BTS BBU + RRU

Equipment Room USD1,000/month. USD500/month.

Rooftop and Pole USD50/month. USD50/month.

It is assumed that a certain network has 100 BTSs. With the use of the SDR distributes BTSs (that is,

BBU + RRU), the equipment room rent can be saved by $600,000 every year.

Saving transmission resource rent

ZTE SDR solution can greatly improve the transmission efficiency. Take E1 transmission as an example.

The average level of the transmission resource used in industry is 180 channels/E1. ZTE supports 244

channels/E1 by using its patent compression technology and will support 290 channels/E1 by using the

highly-efficient compression technology in the future.

In addition, ZTE SDR BTS supports hybrid transmission, that is, E1/T1 and FE transmission are

supported between the BTS and the BSC. As FE rent is very low, the operators can flexibly choose the

proper way according to their transmission resource.

Table 4 Comparison of Equipment Room Rent

Typical 1X + EV-DO

BTSTDM Transmission Hybrid Transmission

Bandwidth Rent 4E1 1E1 + 6Mbps

Rental Fee USD2000/E1/monthUSD2000/E1/month

USD100/Mbps/month

Rental Cost per year 4*2000*12 = $96,0001*2000*12 + 6*100*12

= $31,200

Table 4 shows the cost comparison of three transmission modes. We can find that the adoption of hybrid

transmission mode can save more than 60% cost as compared with the adoption of E1 transmission only.

Saving power

ZTE adopts a series of leading techniques to save power:

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(1) High-efficiency power amplification

(2) The large-capacity RF system can be used to reduce the power consumption of the single-sector RF

link.

(3) The automatic carrier shutdown technique can reduce the power overhead of the BTS by adjusting the

number of carriers provided by the BTS according to the change of BTS traffic.

(4) The outdoor SDR BTS uses heat exchangers to replace air conditioners, eliminating the power

consumption of the air conditioners.

(5) The automatic temperature control system in the equipment room can be used independently or with

air conditioners to save power and adjust the BTS environment temperature 24/7.Take outdoor BTSs as an example. As shown in Table 5, it is assumed that there are 1000 sites and the

charge for electricity is 0.2$/kWh. The use of SDR BTSs can save more than 1 million USD every year as

compared with traditional BTSs.

Table 5 Power Consumption Comparison of SDR Outdoor BTS and Traditional BTS

Power Consumption

(W)

Traditional

Outdoor BTS

Outdoor RF Unit in

Cabinet

Outdoor RF Unit

on Tower

BTS (S444) 1000 990 800

Air Conditioner 850 0 0

Heat Exchanger 0 50 50

Others 150 100 100

Total 1990 1140 950

Cost Saving (USD)

(1000 sites/year)

- -1.49 million -1.82 million

Exploring new energy resources

ZTE SDR solution provides new energy solutions such as solar energy, wind energy and wind-solar

power as well as biodiesel. Take wind-solar power as an example. The complementary resources have

the following advantages:

(1) Reducing system cost

(2) Independent and simple installation without the need of power supply, which can satisfy the

requirement of rapid site construction in remote areas

(3) One-off investment, providing low maintenance cost and long-term benefit

(4) Renewable natural resource, compliant with the trend of saving energy and reducing pollutants

Saving network maintenance cost

ZTE has developed a series of maintenance tools to save time and labor, and thus help the operator to

reduce the network maintenance cost. Take Call Detail Trace (CDT) for instance. The CDT can trace the

important information of all subscribers in the access system in real time 7/24 thus changing the

traditional way of troubleshooting.

Network Expansion and Evolution

A single SDR macro BTS supports 48 carrier-sectors. A single RF unit supports at most 8 carriers and 1

sector. Due to the capacity advantage, the SDR BTS helps the operator to implement network expansion

at a lower cost.

In addition, the SDR BTS supports EV-DO Rev.B. It can support EV-DO Rev.B Phase 2 by channel board

replacement and software upgrade. ZTE SDR BTS can support CDMA and LTE simultaneously by adding

LTE channel board, replacing the CDMA RF unit with a CDMA/LTE two-mode RF unit, or adding an LTE

RF unit. ZTE SDR BTS can protect the operators current investment to the utmost, and help them to win

the increasingly growing radio broadband market in the shortest time and at the lowest cost.

Conclusion

8/13/2019 ZTE CDMA SDR BTS Solution Helps Operators to Reduce TCO - ZTE Corporation

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CDMA SDR BTS Solution Helps Operators to Reduce TCO - ZTE Corporation

Centered on customer demand, ZTE CDMA SDR solution can provide customized solutions at low cost:

(1) At the network planning phase, ZTE CDMA SDR solution can reduce the number of sites by using a

series of technologies for enhancing network capacity and extending coverage.

(2) At the network construction phase, ZTE CDMA SDR solution can greatly slash the expenses in terms

of site acquisition, site construction, equipment transport and installation.

(3) At the network operation & maintenance phase, ZTE CDMA SDR solution can reduce the OPEX in

terms of equipment room, transmission, power consumption, energy and maintenance service.

(4) At the network expansion and evolution phase, ZTE CDMA SDR solution can provide flexible,

convenient and low-cost expansion/evolution solutions to protect the operators long-term investment.

ZTE CDMA SDR solution is the best choice for operators.

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