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Journal of Computer Networks and Communications
Volume 2012 (2012), Article ID 409817, 11 pages
Research Article

Infrastructure Sharing as an Opportunity to Promote Competition in Local Access Networks

1School of Technology and Management, Polytechnic Institute of Bragança (IPB), 5301-857 Bragança, Portugal
2Institute for Systems and Robotics, Technical University of Lisbon (IST), 1049-001 Lisbon, Portugal

Received 8 October 2011; Revised 8 January 2012; Accepted 21 February 2012

Academic Editor: John Doucette

Copyright © 2012 João Paulo Pereira and Pedro Ferreira. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Telecom infrastructures are facing unprecedented challenges, with increasing demands on network capacity. Today, network operators must determine how to expand the existing access network infrastructure into networks capable of satisfying the user’s requirements. Thus, in this context, providers need to identify the technological solutions that enable them to profitably serve customers and support future needs. However, the identification of the “best” solution is a difficult task. Although the cost of bandwidth in the active layer has reduced significantly (and continually) in recent years, the cost of the civil works—such as digging and trenching—represents a major barrier for operators to deploy NGA infrastructure. Duct is a critical part of the next-generation access networks, and its sharing would reduce or eliminate this capital cost and this barrier to entry. The aim of this paper is to provide a better understanding of the economics of broadband access networks technologies (wireline and wireless), their role in the deployment of several services in different regions, and the development of competition in the access networks.

1. Introduction

The need for telecommunication networks with higher capacity is becoming a reality all over the world. However, there is a recognized disparity between broadband availability in urban and rural areas. Preexisting rural telecommunications infrastructure is generally poor and unevenly distributed in favor of urban centers [1]. In most rural areas, low population density and high deployment costs discourage private investment, creating a negative feedback of limited capacity, high prices, and low service demand. It is costly to build telecommunications networks in rural areas. Further, in many cases, there is not a good commercial business case for rural deployments; established, competitive service providers already offer solutions for urban and suburban areas, yet there is little or no commitment to connect areas that include smaller towns and rural villages [2]. The deployment of access network broadband services in low competition areas is characterized by low subscriber densities, longer loop lengths, lower duct availability, and, consequently, higher infrastructure costs compared to high competition areas.

The rapid development of new-generation applications requires upgrading the access infrastructure a necessity for higher throughput requirements and communication demands. These applications include high-definition television (HDTV), peer-to-peer (P2P) applications, video on demand, interactive games, e-learning, and use of multiple personal computers (PCs) at home. Other ubiquitous broadband access requires a minimum bit rate sufficient to allow all citizens to benefit from these services. As a result, to run voice, data, video, and advanced Internet applications, residential users might soon need connections of more than 30 Mbps [3].

Service and network providers are challenged to provide this higher-capacity access to the end user and offer wider services. Consequently, new Internet infrastructure and technologies that are capable of providing high-speed and high-quality services are needed to accommodate multimedia applications with diverse QoS requirements. Until a few years ago, Internet access for residential users was almost exclusively provided via public switched telephone networks (PSTN) over the twisted copper pair [4]. The new quadruple play services (i.e., voice, video, data, and mobility) require high-speed broadband access, which created new challenges for the modern broadband wireless/wired access networks [5]. The new services led both to the development of several different last-mile solutions to make the access network capable of supporting the requirements and to a stronger integration of optical and wireless access networks.

2. Next-Generation Networks (NGNs)

The move toward NGNs has significant implications for the technical architecture and design of access network infrastructure, as well as the value chains and business models of electronic communications service provision [6]. This migration has begun to transform the telecommunication sector from distinct single-service markets into converging markets [7]. NGNs allow consumers to choose from among different access network technologies to access their service environment. In our work, the NGN architecture will be limited to the current and future developments of network architectures in the access network (local loop), referred to as the “next-generation access network” (NGAN).

2.1. Next-Generation Access Networks

NGANs are being deployed across the world with technologies, such as fiber, copper utilizing xDSL technologies, coaxial cable, power line communications (PLC), wireless solutions, or hybrid deployments of these technologies. Wireless networks typically use a range of different technologies, including high speed packet access (HSPA), HSPA+, worldwide interoperability for microwave access (WiMAX), and long-term evolution (LTE). Further, wireline networks increasingly employ some form of fiber, such as fiber-to-the-home (FTTH) and fiber-to-the-curb/cabinet (FTTC). NGN access in a fixed network is initially broadband access-based on the copper loops; however, many countries are in the process of enhancing these networks over time to provide higher speed using fiber-based technology, such as very high-speed digital subscriber line (VDSL) or FTTB/H. For cable networks, often the only voice service is IP based, whereas for mobile networks, the migration to IP voice is more complex [6].

2.2. Competition in Next-Generation Access

The choice of a specific technology for NGAN can be different among countries, geographic areas, and operators. In recent years, there has been an increase in the number, coverage, and market share of “alternative” networks or operators, such as resellers, unbundling operators, cable network operators, operators using frequencies for WLL/WiMAX, and operators deploying optical fiber in the local loop [8]. This has resulted in differences in competitive conditions among geographic areas, leading to increasing arguments (especially from incumbent operators) that geographical aspects should be recognized in market/competition analyses and regulatory decisions. There are several factors that might be responsible for this discrepancy [9]: state and age of the existing network infrastructure; length of the local loop; population density and structure of the housing market; distribution of the number of users and street cabinets for local exchange; level of intermodal competition in the market; willingness to pay for broadband services; existence of ad hoc national government plans for broadband development.

3. Model Overview

3.1. Description

The proposed model compares seven NGA broadband technologies—FTTH-PON, xDSL, HFC, PLC, Fixed WiMAX, UMTS, and LTE—in different scenarios, focusing on the access segment of the network (between CO and customer premises). Some assets within the access network include (1) feeder, distribution segment, and the final drop connection to the customer’s premises (we assume that the cost associated with final drop connection is included in the activation fee of the service); (2) trenches/ducts from CO and customer premises; (3) cable (optical fiber, copper, and coax) in feeder and distribution part of the network; (4) radio systems (wireless solutions); (5) equipment, such as repeaters, line cards, DSLAMs, ONU, and OLTs.

The programming language used to implement the model was Microsoft Excel with Visual Basic for Applications (VBA), which includes all relevant capital and operating expenditures for the several technologies. The proposed tool calculates the required total expenditure in terms of CAPEX, OPEX, and other several economic indicators.

3.2. Model Structure

The proposed model is divided into four main parts (Figure 1): input parameters, engineering model (applies engineering criteria to determine the volumes of components), economic model (provides information for several kinds of information), and a sensitivity analysis model that shows the effects of uncertainties.

Figure 1: Model structure [10].

4. Business Case (Case Study) Definition

The definition of a “business case” implies a great number of assumptions, such as the penetration rate, components prices, and the market share rate. However, it is difficult to get an exact forecast of its performance. The utility of a business case is offering a more approximated estimation that allows for the construction of future scenarios. It is fundamental that the business case be as realistic as possible to be useful and reflect all the variables of interest of the market as well as its own evolution and expected behavior [11].

In each business case, several scenarios can be defined by network alternatives, service portfolio, market segments, and external factors such as regulatory issues, competition, and demand evolution [12]. A “scenario” is the description of the network situation to provide a given set of services to a number of users within a certain area and study period, including one or several operators [13, 14]. In summary, the scenario description is defined in terms of regulation, services, competition, and technology. Scenario-based technoeconomics uses scenarios to estimate several economic results of a technology in different circumstances.

4.1. Main Assumptions and Input Parameters

The first step is to collect all input relevant to the business case. Each network deployment has a unique set of financial, technical, and business parameters that need to be modeled and analyzed [15]. The base case was developed to study the costs and other economic results of two technologies (FTTH: PON and LTE) in two different regions (urban and rural) and different competitive markets. The analysis horizon is 10 years.

The network is built for the total number of homes passed in advance of subscriber turn on (fixed costs). All construction work (trench, ducts, cable, cabinets, base stations, etc.) required to provide service to all homes passed takes place in the first year. Therefore, all infrastructure costs (e.g., housing construction, electronics, and cable deployment) are incurred for all homes passed. Equipment is deployed based on take rate assumptions. This implies that in areas with low penetration rates, the cost per subscriber would be higher than at high take rates, where it would be low [16]. However, the deployment costs of the CPE, the drop cable/installation, and the ports in the aggregate node are incurred only when a home subscribes (marginal costs). We also assume there is maximum sharing of trenching, which means that all wires run over a common trench for as far as possible. The method used to calculate the reduction factor for trench sharing is based on previous Europe economic projects [17]. Table 1 presents the main general assumptions considered for the business case.

Table 1: General assumptions summary.
4.2. Territory and Demography

For the rural area, the rollout strategy does not cover the whole area; the target area is limited to 34.04 km2 with 23,000 inhabitants (see Table 2).

Table 2: Territorial and demographic scenarios.

Several studies and models [19, 20] assume that in urban areas, the duct availability rate is about 60% for feeder segments and 40% for the distribution segment. In rural areas, the duct availability rate is 25% for feeder and 0% for the distribution segment. The report from Analysys-Mason [21] assumes that a substantial proportion (80% near to the CO and 30% nearer to the premises) of existing ducts can be reused for fiber deployment (see Table 3).

Table 3: Infrastructure reuse assumptions [18].

For mobile solutions, [22] assumes a site sharing of 90% in urban areas (lower in less-populated areas) as regulation declares that masts for UMTS must be shared between operators.

4.3. Service Profiles Assumptions

Service profile is key driver of the business model, and some assumptions have to be made. The service profile drives the revenue and traffic forecasts, and the traffic forecast drives capital and operating expenses. The traffic generated by users is required to calculate economic results. For all services, we need to define the type (e.g., triple play and phone), bandwidths, mobility, and so on.

So, as the network services are used and the number of users connected in the network is increasing, the throughput demand tends to grow quite rapidly over time. Several studies propose some 20% to 50% growth every year in the long run [14, 2326]. Since the average traffic demand per user is increasing exponentially, the network is initially dimensioned for the whole demand growth in the study period.

Let us assume the growth ratio of throughput demand to be 1.12 (12%) per year for Service 2 and 1.1 (10%) per year for Service 1 (see Table 4).

Table 4: Service profile technical features.

As the average traffic demand per user increases, the network is initially dimensioned for the whole demand growth in the study period.

The expected tariff evolution (factor by which the tariff is expected to increase or decrease annually) is defined for both tariffs (see Table 5). We assume that one provider charges the same retail price in all regions. We observe that several studies and deployments [2729] use the yearly price erosion of between 5% and 15%.

Table 5: Service profile characteristics (retail prices).
4.4. Broadband Market Penetration (Penetration Rates)

It is challenging to forecast the number of subscribers an operator can expect to sign over the life of the network. Specially, it is hard to predict consumers’ behavior when faced with new technologies, new services, or if is required to opt for a new provider of that service [30].

For fixed broadband, the European research project CELTIC/MARCH estimates a penetration rate of 67.2% in 2018 (60% in 2010). As we can see in Figure 2, the fixed broadband penetration is reaching a saturation level. For mobile broadband, the long-term broadband saturation level in the consumer market (Western EU) is estimated to be between 32% [31] and 34% [28, 32, 33] in 2020. In 2010, the average penetration in Western EU was 6% and is estimated that penetration will be 20% in 2015 [34]. During the study period, there will be churn effect caused by mobile broadband substitution. Reference [28] argues that specific reasons are the cheaper prices of mobile broadband compared with fixed broadband. The market forecast is based on Gompertz model. Figures 2 and 3 show the penetration forecast for fixed and mobile technologies. In 2020, the expected penetration rates for the fixed technologies are 1.5% for WiMAX, 14.25% for HFC, 22.71% for fiber, and 30.97% for DSL.

Figure 2: Fixed BB penetration forecasts (residential market).
Figure 3: Mobile BB penetration forecasts (residential market).

To better plan the network capacity, we also segment the estimated broadband penetration into services classes; it is important to characterize how many subscribers are assigned to each service in each region/segment. We estimate that in Year 1, 40% of all subscribers in the urban area (for the residential market segment) are assigned to Service 1 (2 Mbps) and 60% are Service 2 (20 Mbps). We also assume that market share of Service 1 has a decrease about 5% in the urban area and 3% in the rural area.

4.5. Competition and Market Share (Deployment Strategies)

In this section, we define the number of competitors (players) in the service operator market, the number of competitors (players) in the network operator market, and the market shares of the competitors.

In the urban area, the new entrant is faced with three players (competitors) in broadband fixed access technologies and three competitors in the broadband mobile access technologies: (1) DSL: one incumbent operator and one competitive operator (also known as alternative operators). It is assumed that the three operators (incumbent, competitive, and new entrant) control the entire market (100%); (2) HFC: one incumbent operator; (3) UMTS: three incumbent operators. In the rural market, the new entrant has one competitor in broadband fixed access technologies and three competitors in the broadband mobile access technologies: (1) DSL: one incumbent operator; (2) UMTS: three incumbent operators.

5. Network Architecture Assumptions

With this business case, we want to compare two solutions (FTTH: PON and LTE) from the point of view of the existent competitors and a new entrant (i.e., an operator that does not have its own network infrastructure in the service area). Figure 4 shows the architecture defined in our case.

Figure 4: Broadband access network architecture.
5.1. Network Components

For FTTH architecture, we assume that in the central office, the OLT card (with one or several ports) ensures the interface between the switching equipment and the ODN (Optical Distribution Network). The OLT line cards are aggregated on shelves that are placed in racks. The OM (Optical Monitoring) module surveys the ODN quality and an MDF (Main Distribution Frame), which provides a connection point between equipment and outside cables. For outside plant construction, it is necessary to consider the hardware parts (fiber cables, splices, splitters, connectors, and enclosures) together with civil work (e.g., trenching) and installation techniques. Each fiber cable is composed of several fibers.

Digging and ducting are the major cost items in access networks, outweighing by far the costs of the transmission medium and the line terminating equipment. Civil works typically take some 85% of fiber to the home (FTTH) first installed network costs, while the fiber cable and the optical components take only 3%; the remainder is taken by other hardware, installation activities, and other services [35]. Hence, in Greenfield situations, the costs of introducing FTTH may not differ much from twisted copper pair or coaxial cable access solutions (see Table 6).

Table 6: FTTH (PON) architecture components by category.

Based on LTE system architecture presented previously, the LTE system consists of two main blocks: the E-UTRAN and the EPC. The E-UTRAN segment is characterized by a network of eNBs that support OFDMA and advanced antenna techniques. Each eNB is composed of an antenna system (radio tower), building, and base station equipment (transceivers and antenna interface equipment). In the UE segment, users who connect using LTE mobile broadband will require an LTE modem to access the network, which will be available using PCMCIA cards; internally embedded modems inside laptops; ExpressCard; or a USB modem. Any users with mobile phones or PDA devices will also eventually have the ability to access the Internet using LTE mobile broadband services. For home Network Termination Units (NTUs), a receiver assembly that can produce one or more outputs can be connected to devices such as home telephones, computers, or television sets (see Table 7).

Table 7: LTE architecture components.
5.2. Capital Expense (CAPEX) Items

For each technology, a number of cost components are assigned to different parts of the networks. The major CAPEX components for each technology are described in Table 8. For each component cost, we also use a set of parameters required to calculate final costs, depreciation, economies of scale, and so on.

Table 8: CAPEX costs.
5.3. Operating Expense (OPEX) Items

Like network components costs, operation, and administration costs (OAM) have to be included in the calculations analyses. Table 9 presents the OPEX costs (per annum) as a percentage of initial CAPEX.

Table 9: Operation and administration costs (OPEX).
5.4. Technical Specifications

Several key network design assumptions used in our model are combined with the service profile as an additional input to the business model. These assumptions are presented in Table 10. These values are used to calculated network traffic, capital expenses, and operations expenses.

Table 10: Technical assumptions.
5.5. Scenarios

Several business case scenarios are studied and the economical results are presented (see Table 11).

Table 11: Scenarios description.

6. Business Case Evaluation (Results)

In Scenario 9 (upgrade DSL/HFC to FTTH(PON), urban area), the NPV is positive (23 M€), IRR is 42%, and payback period is five years. However, in the rural area (Scenario 10), the NPV and IRR are negative, and the payback period is greater than this study period (see Table 12).

Table 12: General economic results: FTTH(PON).

Results show that the strategy of new entrant to deploy fiber deeper into the access network is not economically viable (Scenarios 11 and 12). In the urban area (Scenario 11), the NPV is −77.9 M€ and IRR is −15.42%. In Scenario 12 (rural area), the estimated NPV in the end of Year 10 is −74.5 M€ and IRR is −35.2%. The cumulated CAPEX in Year 10 for the urban area is six times superior to the incumbent costs. In the rural area, the CAPEX is 13 times superior (see Table 12).

For Scenarios 11 and 12, we also compute the economic results when the new entrant uses the passive infrastructure (ducts) from the incumbent operator (see Table 13). Table 14 presents the economic results if the new entrant (Operator 2) decides to lease (instead of build) the ducts from incumbent (Operator 1). We assume, in the urban area, duct availability (number of ducts available for leasing) of 100% in the feeder segment and 100% in the distribution segment. For the rural area, we assume 75% and 75% for both feeder and distribution segments. The results clearly indicate that the economic results improve significantly. The NPV of Operator 1 increases from 23 M€ to 28.6 M€, and the payback period is reduced to 4 years; this occurs because of the value paid by Operator 2 to use Operator 1’s infrastructure. Operator 2 also gets positive effects with the increase of NPV, about 70 M€, a decrease in the payback period, and a significant reduction of CAPEX.

Table 13: General economic results of FTTH(PON) with infrastructure sharing.
Table 14: General economic results of LTE.

For LTE technology, we define two main scenarios (upgrade of UMTS network to LTE and the deployment of a new network by a new entrant) that are applied in both regions. In Scenario 17 (upgrade in the urban area), the NPV is positive but low, and the IRR is 14.5%; the discounted payback period is estimated to be nine years. In the rural area (Scenario 18), the discounted payback period is greater than 10 years. The upgrade scenario in the rural area has a negative NPV, but the IRR is positive, although the Greenfield deployment (Scenarios 19 and 20) has higher costs in both regions. The IRR is negative and similar in both regions (−30.02% and −30.1%), and NPV (besides negative) is higher in the rural area. Like other technologies, LTE will benefit from an adequate infrastructure sharing (see Table 14).

7. Sensitivity Analysis

These results are based on assumptions, forecasting, and estimation of several parameters; therefore, it is essential to investigate which are the most significant parameters to influence the results (sensitivity) and, if possible, verify such factors as increased profits or other negative results. With the sensitivity analysis, we can understand the influence of several input parameters (e.g., HH, penetration rates, segments length, bandwidth, retail price, discount rate, trench/duct infrastructure sharing) on the economic indicators results (NPV, IRR, CAPEX, OPEX, and PB).

Comparing the relative importance of variables (Figure 5), we can verify that the number of HH, penetration of BB subscription, and monthly tariff of Service 2 has a big impact on the NPV of Operator 1 (Region 1). For new entrants (Operator 2), the most significant parameters are distribution segment length, trenching prices, and trench/duct share. Less sensitive parameters are omitted.

Figure 5: Sensitivity analysis results, FTTH(PON)/urban area/Op. 1 and 2.

In the LTE operator cases (Figure 6), the demand required per user (Service 2), BB subscription, equipment price, risk free rate, and start market share are the most sensitive variables.

Figure 6: Sensitivity analysis results, LTE/rural area/Op. 1 and 2.

Figure 7 shows the result of the linearly variation (−50% to 50%) of the input parameters for LTE technology, urban area (Region 1), and Operator 2 (New entrant). For example, if the throughput demand/user (Service 2) decreases 30%, the NPV will be positive.

Figure 7: Sensitivity analysis results, LTE/urban area/new entrant.

8. Conclusion

The case study results illustrate the importance of infrastructure sharing for new entrants both in FTTH and LTE. The presented results give important information about the two different solutions in urban and rural areas, indicating that both technologies can provide for sustainable business in Scenario 1. We also identified the critical input parameters for each technology; with this analysis, we examine how technology decisions can change as a function of the input parameters. However, LTE is the better solution for rural areas besides the capacity constraints. The offered capacity per user is the most critical parameter.


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