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HSDPA by Siemens

Full Speed Ahead

White Paper

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Content

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

2 Motivation for HSDPA ............................................................................................4

3 Target Market and Applications ............................................................................6

3.1 Market Overview ................................................................................................6

3.2 HSDPA applications ..........................................................................................7

3.3 HSDPA target groups ......................................................................................10

4 HSDPA Technology .............................................................................................11

5 HSDPA Planning ..................................................................................................17

5.1 Coverage Dimensioning ..................................................................................17

5.2 Channel Card Dimensioning ............................................................................19

6 HSDPA Solution from Siemens ...........................................................................19

7 Conclusions .........................................................................................................25

HSDPA by Siemens Page 2 (of 25) V7, 13th of Aug 2004

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1 Introduction

The wireless industry is currently facing many challenges. Mobile penetration hasreached saturation point in many countries and revenue from voice is declining. Sothe mobile operators are looking for new opportunities to increase the revenue. Thesituation is similar with the fixed line operators and internet service providers. Theyare also looking for new opportunities to increase the revenue. Mobile operators aretrying to increase their revenue by providing new services based on packettechnology and are also looking for opportunities to substitute the fixed line serviceslike PSTN and DSL with wireless services. On the other hand fixed line operators arealso trying to flex their muscles in the wireless field. Technological developments likeWLAN 802.11b, 802.16, cdma 2000 EV-DO have enabled the fixed line operatorsand alternate mobile operators to focus in the field of fast growing data

communication. Technological developments like GPRS/EDGE/UMTS have helpedmobile operators to increase their revenue by providing new data services to acertain extent. However, these technologies have not been able to reduce the cost ofdelivering per Mbyte of data to the end user to a level where GSM mobile operatorscan compete with the alternative technologies for a profitable business growth.

To enhance the competitiveness of UMTS new technological evolution for UMTScalled HSDPA (High Speed Downlink Packet Access) has been standardized within3GPP in release 5. HSDPA is to UMTS as EDGE is to GSM; a technology which actsas an upgrade to existing infrastructure, enhancing network performance without theCAPEX burden of overlaying an entirely new radio network. HSDPA provides a two-

fold improvement in network capacity and boost data speeds up to 14Mbps/user. Enduser speeds of 2Mpbs are expected to be achievable - even higher under optimalnetwork conditions. Shorter network latency and better response times are alsoenabled by the technology upgrade, allowing time-dependent applications, like livevideo streaming and multi-player gaming, to perform more effectively.

HSDPA will enable the mobile operators to:

reduce costs / MByte by up to factor 2

create rich and attractive new services for lucrative end-user segments

unleash UMTS business to achieve its full potential counter the mobile operators using cdma 2000 EV-DO technology

counter emerging access technologies like 802.xx and service provider usingsuch technologies

position as a mobile DSL Service Provider

provide truly converged voice and data solution to the end user using singledevice anytime, anywhere


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2 Motivation for HSDPA

2.1 The market and technical motivation for introducting HSDPA are:

Gearing up today for tomorrow

Consumer behavior and life style is changing. Tech savvy young generation

of today will ask for more from the mobile operators in terms of data speedand new services in coming years. Imagine a technology that enables usersto browse Web pages faster on cell phones than contemporary broadbandusers can do on PCs; a technology that is more than 10 times as fast astodays UMTS for speedy, truly satisfying video streaming, teleworking andgaming for such users. Enterprising MNOs need to deploy such technologytoday to meet tomorrows demand.

Opportunity knocks

In a fiercely competitive communication market where growth in data bits isexpected to outstrip growth in revenues, the best way to get ahead of thegame is to provide faster, higher quality services and richer applications.MNOs are now looking to optimize networks to support tomorrows dominanttraffic type. Though gearing up for more bandwidth poses a challenge, it alsospells a tremendous opportunity.

The shifting traffic paradigm

The industry consensus has it that in mature mobile communication markets,packet-switched traffic will soon surpass circuit-switched traffic. Indeed, inmost fixed networks, IP-based traffic volume has eclipsed circuit-switchedtraffic. Mobile networks are sure to follow suit as new IP-based mobileservices emerge and eager users adopt them. So mobile operators needtechnology, which can deliver data to their end-users at an acceptable price,

Promising prospects:

Public acceptance of cell phones has been overwhelming, and fasterconnections to advanced mobile services are bound to receive a similarlywarm welcome. End-users are sure to embrace these sophisticated offerings,with savvy subscribers - power business users and consumers with a healthyappetite for data-rich applications leading the way. Best of all, this end-usersegment is willing to pay a premium for speedy, secure mobile data services.

Taking the mobile data sector by storm:

HSDPA offers far more performance at lowest cost, enabling real mass-market mobile IP multimedia. Operator can increase companys profitability

by delivering higher quality services at lower costs. Higher QoS and greatercapacity is destined to drive demand for data-intensive services, therebyboosting operators bottom-line.

Minimizing risk, maximizing opportunity:

Any such new technology needs to be evolutionary to keep the marginal costof introducing it to minimum.HSDPA is evolution of the already deployed UMTS technology and thus canbe deployed with minimum CAPEX and OPEX for the operators.

Competitive Threat:

There are many new technologies like 802.xx, cdma2000 EV-DO/EV-DV that

are being deployed by mobile operators and other service providers whichposes threat to the GSM mobile operators.


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HSDPA will enable MNOs to counter threats from operators/service providerssuch technologies.

Pricy business applications like VPN services mandate utmost security,availability and reliability. HSDPA fits the bill. So much more than a hot spottechnology, it offers what WLANs cant trust center-class data security,service coverage beyond hotspots, network reliability, and convenient billingvia conventional phone bill. And with hallmarks such as reduced responsetime, DSL-like latency, improved peak rate and packet data throughput,enhanced spectral efficiency, and improved transmission and error correction,HSDPA is a genuine leap forward from 3G R99.

2.2Motivation for Mobile Operators to introduce HSDPA:

All the general motivations mentioned above are applicable for MNOs to introduceHSDPA. Due to HSDPAs high quality and average data rates of 2Mbps mobile

operators can generate additional revenues by positioning themselves as WirelessDSL providers.

HSDPA will help MNOs to increase their revenue through earlier adoption of UMTSdata services among its users and also addition of new subscribers for wireless DSLservice.

Additional revenue generation for wireless DSL subscribers can be forecasted asbelow. The calculations are based on certain assumptions for simplicity andare for indicative purpose only. For more detailed calculation regarding

business case detailed discussion with the customer is necessary.

Assumptions:

With the introduction of wireless DSL services from MNOs some of the DSLcustomers of fixed DSL service providers will switch to wireless DSL from Mobileoperators due to

Seamless service coverage in-house and while on the way

One device, one bill, one user interface for mobile services andbroadband internet access

Secure and reliable due to carrier grade mobile technology

Churn Rate: 5% from other fixed DSL providers subscribers.

Some of the XDSL packages (comparable to the wireless DSL service that can beprovided with HSDPA) being offered by the service providers are as follows. (Typicalsituation, assumptions)


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XDSL ServiceProvider

Data rateDL/UL Kbps

Monthly Fee ()

Service provider 1 2048/384 15

Service provider 2 1024 /384 28

Based on the above tariff structure Mobile Operators should be able to chargemonthly fee of 20 per subscriber for wireless DSL service (1024 Kbps/128 Kbps) assubscribers are willing to pay some premium for the mobility.

The number of wireless DSL subscribers of the assumed MNO is the number ofsubscribers who leave the XDSL services of the other service providers and is shownbelow.

2006 2007 2008

# of users SP1 and SP2(in Million) 11 12 13

% churn 10% 10% 10%

MNO W-DSL subs (in Million) 0.6 0.6 0.7

ARPU in : 20

Revenue (in Mill.) 22,5 24,5 26,5

Thus with HSDPA, Mobile Operators can generate more than 22,5 Million Euro per

year from year 2006.

3 Target Market and Applications

3.1 Market Overview

It is expected that in next few years the ARPU due to mobile data services willincrease significantly. It is expected that data ARPU will reach about 35% of totalARPU by year 2010. Please see below for the expected growth of mobile data in theworld market and Asia till year 2010. The expected growth in mobile data in future

provides MNO an excellent opportunity to increase their revenue with new innovativeservices.


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Figure 1: Mobile data uptake

In Malaysian market also the importance of data is expected to increasesignificantly as it will contribute more and more for operators revenue incoming years. By year 2010 it is expected that the data ARPU reach about 9Euro for total ARPU of about 25 Euro. This is in line with expected growth of dataARPU for the world market as depicted in figure 1. See the figure below for theforecast for Malaysia market (Source: Siemens ICM N SM Market Assessment

Figure 2: Expected Data and Voice ARPU and Revenue Growth in Malaysia

3.2 HSDPA applications


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HSDPA is best suited for services/applications requiring background,interactive and streaming type quality of service for example internet/intranetaccess. The significant improvement in download times as shown in figurebelow can improve the perception of the users towards the mobile dataapplications and enhance the acceptability and usage of mobile data services.

Figure 3: Performance of HSDPA for data download

Since HSDPA optimizes the downlink channels, it suits asymmetric traffic type ofapplications, which require higher traffic on downlink rather than on uplink direction.Therefore, it is recommended to deploy HSDPA in operator network to cater thefollowing services categories:

- Location based applications (city guide, mobile tracking/finder, advertisement)- Mobile VPN* (corporate access to email, file download, intranet)- Infotainment (video streaming, music download, mobile TV, mobile gaming)- Mobile internet (file download, internet browsing)

-Open new market as wireless DSL or WLAN service provider


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*VPN: Virtual Private Network

Figure 4: HSDPA for services with more than 50% downlink direction

To identify potential successful future applications, Siemens has conducted end usersurveys in west European region. The results suggest significant demand forapplications supported by HSDPA. HSDPA supported applications are marked withpink as depicted in the chart below.

Sources: Siemens Mobile Networks Marketing, April 2003;

Siemens End-User Survey Enabling Services, October 2002; TNS Emnid 3G Monitoring,December 2002


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Figure 5: Siemens end user survey

Operators can further benefit by implementing Siemens advanced IP MultimediaSubsystems (IMS) solution with HSDPA. This will offer a combination of multimediareal-time services (voice/video) with non-real time information/data services on asingle device, thus raising ARPU via increased customer base service usage fromperson-person and group-to-group communications. We believe that IMS (IP-basedMultimedia Subsystem) can play a very important role in this part. As example, thereare two WCDMA/HSDPA/IMS applications scenario, which try to exploit differentservices approach to boost traffic and revenue.

Example 1: Sports News.

Peter is a fan of MU and registered as MU portal member.

He also registers some of his friends in a Goal-Community Group.

Once a goal is scored, Peter is notified. He clicks on the provided link and

starts downloading the video of the goal.

By clicking on the Icon Goal Community he can

- Start a Push To Talk or Video Conferencing session

- Show the goal to his buddies (in his contact list)

- Forward the Video clip to his friends (and pay for it)

- Or send instant messaging to his buddies

Example 2: Music Fan Club.

Martha is a big fan of Madonna and she subscribes to the MusicChannel

Whenever Madonna new video is released, Martha gets an IM notification

with video and chat Icons attached. Martha clicks on Video Icon to view the

video.

She really loves the video and starts a Push-to-Talk Session.

While talking to Lisa and Anna she sends part of the video as a push-to-see

so they can watch it.

Then Martha clicks on chat link and joins the current session of the Madonna

chat community using Push-to-Talk dial-in to discuss the video and Madonna

news.

3.3 HSDPA target groups

Mobile network operator (MNO) can basically offer its HSDPA based applications toboth business as well as residential subscribers. Mobile VPN services for instance

are mainly dedicated for business users and the infotainment services are forresidential or youth subscribers. With the availability of HSDPA module for PC/laptop


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users, HSDPA will enable MNO to offer WLAN, wireless DSL services to home andSME users as well.

Figure 6: HSDP target groups

4 HSDPA Technology

High Speed Downlink Packet Access, known as HSDPA was introduced into the3GPP UTRAN standards for both FDD and TDD from Release 5. HSDPA refers to anumber of shared channels, of which the data-bearing channel is known as HS-DSCH. Key features of HSDPA are as follows:

It is a downlink only service; it provides no enhancement for the UL

It is a packet data service, in which the network allocates resources fortransmitting packets over the air to different terminals on a best effort basis

The MAC layer in the network ensurespacket decoding by a terminal andpacket scheduling for transmission in a shared media quality

Typical achievable throughput is in the range 2-5 Mbit/sec (max. throughput is13.98 Mbit/sec)

3GPP is currently working on MIMO for HSDPA, which it is claimed will beable to increase typical throughput to 10Mbit/sec

4.1 Features used in HSDPA:

The performance improvement that is obtained by HSDPA technology is achieved by

means of a number of additional features built on top of the pre-existing FDD (orTDD) standards:


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Fast scheduling by the node B

Hybrid ARQ

Adaptive Modulation and Coding

Higher order modulation

Fast feedback of channel state information

Figure 7: HSDPA key principles

4.1.1 Fast scheduling by the node B

In Release 99 and Release 4 UMTS systems, all management of radio resources isperformed at the controlling RNC. In the case of the downlink shared channel, sharedresources are set up that are accessible to a number of terminals, but the CRNC

makes a decision based on traffic volume and buffer occupancies to grant the sharedresources particular terminals for defined amounts of time.

Basing all radio resource management at the CRNC allows effective control ofmacrocellular performance issues such as mobility, soft handover and inter-cellinterference. However latencies involved in communications across the Iub interfacebetween the RNC and node B, and RRC connections to the terminal mean that theCRNC cannot accurately base its resource decisions on up to date channel stateinformation. For example, to grant DSCH resources based on the SIR experiencedby a terminal would require an SIR measurement to be performed at the terminal andtransmitted across the air and then via the Iub interface to the CRNC (if the CRNC is

not the serving RNC, further transmissions across Iur may be required). If the CRNC


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then decides to grant DSCH resources, further Iub (and possible Iur) signalling isrequired.

In HSDPA, the controlling RNC allocates a block of HS-DSCH resources (code treeand transmit power) to the node B that the node B is allowed to autonomouslyallocate between terminals on a dynamic basis. Since there exists only the Uuinterface between node B and terminal, the node B can collect channel stateinformation from the terminals by means of fast layer 1 signaling and then make afast HS-DSCH allocation to terminals.

4.1.2 Adaptive Modulation and Coding

When the scheduling algorithm has allocated HS-DSCH resources to a terminal, thenode B is further able to optimise its transmission format according to the link level

conditions. The terminal sends to the node B an indication of the quality of the radiolink using the CQI (Channel Quality Indicator)). Based on this, the node B can adaptthe link as follows:

The node B is able to switch between QPSK and 16QAM

The node B is able to set the coding rate by adjusting the amount ofpuncturing applied to turbo coded data by means of varying the amount ofdata transmitted in a TTI.

The selected coding rate and modulation format remain constant for the duration ofan HSDPA TTI (2msec for FDD). The transmit power of the HS-DSCH is kept at aconstant level and the coding and modulation format is chosen to maximisethroughput to the terminal. Increasing the code rate or moving from QPSK to 16QAMincreases the size of the transport block that can be sent during the TTI, however theprobability of the transport block being in error also increases. The optimal tradeoffpoint between these two contradictory effects depends upon channel conditions andis selected according to the CQI.

4.1.3 Hybrid ARQ

On receiving and demodulating a HS-DSCH TTI, a terminal buffers the resultingsoftbits that relate to the coded transport block. Each time a transmission is received;the terminal attempts to decode the transmission and sends back anacknowledgement. If decoding was successful (this is indicated by means of a CRC

attachment to the transport block), a positive acknowledgement is sent and the softbitbuffer relating to the received block is erased. However, if the block could not bedecoded, a negative acknowledgement is sent to the node B and the softbit buffer isretained.

Thus, the node B re-schedules a transmission of the transport block and the terminalcombines the new transmission with the first at the softbit level to improve the signalto noise ratio and the chances of successfully decoding the block. Theretransmission process may be repeated several times if necessary. In this way, theUE is able to decode the correct signal even if all transmitted blocks are disturbed.


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4.2 HSDPA Channels:4.2.1 Downlink HSDPA channels and signaling

HSDPA uses the following channels in the downlink:

HS-SCCH:

The HS-SCCH, or High Speed Shared Control Channel carries layer 1 signaling inthe downlink. The channel terminates in the physical layer and hence there is noassociated transport channel. The HS-SCCH is used to announce allocation ofresources to a terminal, and contains the following information:

The identity of the terminal that is scheduled

The resources allocated to the terminal (in FDD, the number of spreadingfactor 16 codes and their identity). A fixed timing relationship exists betweenHS-SCCH and HS-DSCH that allows the terminal to know when thescheduled interval begins. The duration of the scheduled interval is equal tothe HS-DSCH TTI (2msec or 3 slots in FDD)

Whether the transmission is a first HARQ transmission or a re-transmission

The modulation format and code-block size that will be used

The node B may transmit many HS-SCCHs, to different groups of terminals. If it hasnot been scheduled, a terminal must listen to up to 4 HS-SCCHS. Once it isscheduled, it reads the HSDSCH at the appropriate time and continues to monitoronly 1 HS-SCCH.

HS-PDSCH:

A HS-DSCH transport channel may be mapped onto one or more HS-PDSCHs. The

TTI of HSDSCH is 2msec. HS-PDSCHs always use spreading factor 16 and may useeither QPSK or 16QAM modulation. In FDD, the HS-PDSCH consists only of datasymbols; i.e. no pilot, TFCI, TPC etc are multiplexed.

It carries actual packet data. 15 HS-PDSCHs per cell are possible. Code withSpreading Factor (SF) = 16, QPSK/16QAM is used for HS-PDSCH.

4.2.2 Uplink HSDPA channels and signaling

HSDPA uses the following channels in the uplink:

HS-DPCCH

The HS-DPCCH is used for transmitting two components of UL information:

ACK/NACK This relates to the HARQ and is transmitted after processing ofa HSDSCH TTI is complete.

Channel Quality Indicator; CQI. The CQI indicates to the node B the quality ofthe DL channel. In FDD, it is transmitted at regular intervals. The CQI valueconsists of a modulation format and coding rate, which are estimated by theterminal to give maximum data rate whilst not exceeding 10% BLER. Thenode B uses CQI to make decisions on what coding format to allocate in HS-DSCH transmissions, however the node B is not mandated to use the sameformat as is specified in the CQI (the CQI is used only as a guide).


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The HS-DPCCH is a physical layer channel with no associated transport channel.The length of a HS-DPCCH transmission is 2msec.

Figure 8: HSDPA Channels

4.3 Implications of HSDPA Technology for the Network and Terminal

4.3.1 Radio Network Controller

The impact of HSDPA on the radio network controller is relatively limited. The RNCmust allocate HSPDA parameters, which include the number of codes allocated forHSDPA, the amount of node B power reserved for HSDPA and some parameters forthe feedback channel, such as the power offset for ACK/NACK signaling.

Furthermore, the RNC needs to monitor HSDPA related measurements and adjust

parameters as necessary.

4.3.2 NodeB

RF subsystem

The NodeB RF subsystem needs to be capable of transmitting up to 16 SF16 codesusing QPSK or 16QAM.

Baseband subsystem

The baseband processing for HSDPA is similar to that for other Release 99/Release4 channels although some new DSP algorithms need to be written for transmission ofHS-DSCH and HSSCCH and detection of HS-DPCCH, and the 2msec TTI needs tobe supported additionally, HSDPA has higher throughput requirements on thebaseband cards with a maximum throughput of up to 14Mbps / cell.

Higher layers

The NodeB needs to implement the MAC-hs protocol, which is responsible forscheduling between terminals, AMC and management of data queues for each


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terminal (including HARQ). This non-trivial element introduces additionalintelligence into the node B that was not present for Release 4/Release 99.

4.3.3 Terminals:

The terminal needs to monitor HS-SCCH and to decode HS-DSCH as necessary,generating acknowledgements for the purposes of HARQ. Furthermore, the terminalneeds to regularly report CQI.

Thus additional functionalities required for an HSDPA terminal, compared with aterminal supporting Release4 / Release 99 are:

Reception of 16QAM (dependent on terminal capability)

Support for reception of 5, 10 or 15 simultaneous HSDPA codes, dependentupon terminal capability

Support for soft-buffering and combining required for HARQ

Support for higher amount of processing power required for decoding HS-DSCH peak throughput rates

CQI calculation

Support for HSDPA physical channels

The 3GPP standards have defined 12 categories of HSDPA terminals [3GPP TS25.306]. The terminal informs UTRAN of its HSDPA category in order that thenetwork will take it into account when scheduling data. The parameters which definecategories are as follows:

Support for QPSK only, or QPSK and 16QAM.

The minimum time that must elapse between reception of 2msec HS-DSCH TTIs. This parameter affects the amount of processing time requiredby the terminals and the number of HARQ processes they support.

The number of simultaneous SF16 codes the terminal must be able toreceive. This affects RF and baseband processing complexity.

The amount of softbit memory that must be available. This affects thenumber of simultaneous HARQ processes that can be supported and theamount of puncturing that needs to be performed on coded transport blocks.


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Table 1: HSDPA Terminal categories

5 HSDPA Planning

In general the planning steps for HSDPA traffic are the same as the Release99.

5.1 Coverage Dimensioning

In HSDPA the bit rate per user is not fixed but will be dynamically allocated to theuser according his radio situation and the radio situation of the other HSDPA user inthe cell. The cell range is normally determined by the release99 bearers.

Therefore the cell range is given. The link budget for HSDPA calculates then themaximum possible data rate for a user at the cell border in the loaded network in DL.

As stated before the bit rate of the user is depending on its radio situation and otheruser in the cell. In this case the 512 kbps und the 768kbps are reached at a cellborder. However in the case, that the UE is nearer to the NodeB and the inter-cellinterference is lower these max. data rates can be given to a user. The maximumpossible bit rate per user is depending on the interference situation at the user place.The following example plot depicts this:


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Figure 9: Maximum possible bit rate per user (HSDPA)(max. bit rate: yellow: 128kbps; green: 256 kbps; blue: 512kbps; pink: >640kbps)

From hardware point of view the Node B can serve at maximum 15 HS-PDSCHcodes per cell. In the first HSDPA release category 6 mobiles are supported.Therefore the maximum peak rate per CHC is up to 14 Mbps. In future release thesystem will also support other mobile types. A maximum peak rate of 15 codes in16QAM modulation is about 14 Mbps is given in 3GPP. For the throughput in thenetwork of course other influences will limit the throughput like interference, availablepower of the NodeB, and user behavior. The user data rate will depend on thenumber of codes and the coding scheme.


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Table 2. User Data rate

5.2 Channel Card Dimensioning

The CHC can support up to 15 HSDPA codes, and the remaining resources for otherchannels processing are UL/DL 96 CE, UL/DL96 AMR EQ. So same CHC cansupport both HSDPA and non HSDPA traffic. If HSDPA is used the HSDPAthroughput shall be considered. Each HSDPA cell requires one CHC able to work inHSDPA mode. However if the HSDPA traffic is not very high there is also a possibilitythat one CHC in HSDPA mode can serve up to three HSDPA cells.

At maximum 1 CHC per HSDPA cell can be used.

6 HSDPA Solution from Siemens

Siemens is one of the leading vendors for UMTS with more experience fromcommercial UMTS networks than any other vendor.

Unique selling points of Siemens HSDPA solution are:

Spearheading the HSDPA breakthrough through technologicalleadership

Designed with future mobile data applications in mind, Siemens 3Gequipment is ready for HSDPA. With Siemens HSDPA Solution MOBILEOPERATOR can earn money from the first day of its deployment. Whatsmore, because the Siemens solution is a software upgrade, the costs of


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enhancing network capacity are low and swiftest time to market is assured.And all that adds up to additional revenue streams and fast ROI.

Some of the key features Siemens plans to support with HSDPA are:

Support of all basic HSDPA functionality.

Iub flow control to control the traffic between NodeB and RNC.

QPSK, 16-QAM, HARQ, simple scheduler and interactive/backgroundtraffic classes.

Support of inward and outward mobility as well as basic HO scenarios

max ideal Peak Rate Throughput per user in downlink: 3.6 Mbps (UEcapability class 6)

typical capacity improvement of 60-80% per cell (po-traffic)

up to 64 UEs on HS-DSCH

up to 64 HSDPA users per cellup to 15 HS-PDSCH codes per cell

Time to Market

Siemens along with our partner NEC is first to introduce HSDPA in themarket. We are working closely with our customers in Japan and Europe tolaunch HSDPA commercially in 2005. Based on our early experience withHSDPA in developed market like Japan and Europe we can provide bestHSDPA solution to MOBILE OPERATOR earlier than our competitors.

Smooth upgrade to HSDPA

Our approach to migration to HSDPA is smooth and painless as describedbelow. Such smooth migration of our Node B and RNC enables MOBILEOPERATOR to introduce HSDPA with minimum CAPEX.

HSDPA Support in Node B:

NodeB4xx (440/441/420) is hardware prepared for HSDPA. While othersuppliers equipment requires physical upgrades, NodeBs can be upgradedover the air with no downtime and no overhead for field service. Siemens is

using 2nd generation of node B platform, which is prepared for futureevolutions like HSDPA, remote radio heads etc., while our competitors arestill using the 1st generation of platform.

Channel card 96 (CHC96) is already prepared for HSDPA. We offer the mostflexible channel cards on the market, where no dedicated HSDPA module isrequired, though the resources are shared between Rel. 99 and HSDPA andwhere we can configure the CHC in a one to multi cell configuration. It meansno dedicated HSDPA equipment required. And with a 50-to-100% capacityincrease per NodeB, MOBILE OPERATORs investment, though low, goes avery, very long way.


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Figure 10: HSDPA Ready NB 44X

HSDPA Support in RNC:

Siemens RNC is able to support HSDPA with minimal change in hardware.The following two new cards shall be implemented on the RNC to supportHSDPA to support new protocols and higher data rate.

HS-DST: a card supporting MAC-d entity, HS-DSCH FP and throughputhigher than current DHT.

HS-PRLC: a card supporting same functionality with PRLC, but with higherthroughput.


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Figure11: Upgrade of RNC to support HSDPA

End to End Solution

With the most advanced technology and most stable networks to our credit,Siemens UMTS experience is unrivalled. We partner with top-drawer chip set

and mobile suppliers to turn up a true end to-end HSDPA solution. Besides theinfrastructure support Siemens will provide PC cards for HSDPA to ensure earlyavailability of end to end solution. HSDPA capable mobile phones will follow later.So MOBILE OPERATOR can launch HSDPA service to business users orresidential users using laptops earlier than the competitors.


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Figure 12: End to End HSDPA Solution from Siemens

.

Figure 13: End to End HSDPA Roadmap


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First in reliability, first in performance

Siemens UMTS solution is the most reliable and field proven with 12 out of 22commercially launched network (as of May 2004) supplied by Siemens/NEC.

Figure 14: Commercially operating UMTS networks

Moreover the performance of Siemens UMTS solution is one of the best. This hasbeen proven by independent study done by external agency in Germany in Vodafonenetwork.


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Figure 15: Result of Study showing better performance of Siemens UMTS network

Since the Siemens HSDPA solution is only software upgrade in the node B sideour HSDPA solution will be also highly reliable with best performance.

7 Conclusions

HSDPA is the break through UMTS feature-set which satisfies higher capacitydemands as well as demands for new services.

MOBILE OPERATOR can use HSDPA to provide wireless DSL services togenerate more revenue.

Siemens is right partner for MOBILE OPERATOR for HSDPA due to following

reasons: Mobile Operators (MNOs) can introduce HSDPA with minimumCAPEX and OPEX as Siemens Node Bs are hardware prepared for HSDPA.

Siemens can provide end to end solution for HSDPA earlier thancompetitors so that MNOs can have early mover advantage.

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