A Proposal for Test Data Standardization for Handsets Evaluation in
Contents
1. XXVI SIMPOSIO BRASILEIRO DE TELECOMUNICACOES SBrT 08 02 05 DE SETEMBRO DE 2008 RIO DE JANEIRO RJ back of the phone and it is automatically transmitted by the phone when the network asks for it The IE test battery represents 0 2 of the test cases which verify if the handset has a valid identifier An example of IE test case is Show the IMEI in the handset s display D International Mobile Subscriber Identifier IS An International Mobile Subscriber Identity is a unique number that is associated with all GSM and Universal Mobile Telecommunications System UMTS network mobile phone users It is sent by the mobile phone to the network and is also used to acquire other details of the mobile in the Home Location Register HLR or as locally copied in the Visitor Location Register 3 The IS test battery represents 0 3 of the test cases and it verifies the valid of IMSI operations over the network An example of IS test case is Exhibition of IMSI detach logs at BTS Simulator E Phonebook Access PA The phonebook evaluation of handsets does not involve operations over the network so that it is not required by the network standards testing However consumers and carriers often motivate the handsets manufactures to develop this kind of test so that a PA battery was included in our test suite In this way the PA battery represents 2 4 of the test cases and it accounts for evaluating the operations that interact to the handse2. cell selection and cell reselection for circuit switched packet based and dual transfer mode DTM services over GSM WAAAY internet access PC Controller Fig 1 Framework architecture An important feature of network simulation environments is their flexibility in configuring cells At the moment we are specifying both artificial scenarios via the simulator cells editor and real scenarios via the collection and definition of a database contained real network information of several Brazilian cities Using the editor for example we can set the cell identity the channel descriptions and the frequency list The set of all these parameters defines a cell and the collection of all cells defines a scenario Using this architecture we have performed about 59 of the total number of tests that we have mapped II A CLASSIFICATION FOR NETWORK TESTS The principal sources of information to create a suite of tests are the requirements of carriers Indeed if the carri ers account for creating and maintaining wireless network services it is natural that such carriers also provide the requirements that a handset must implement to operate over their networks However the tests provided by different carriers are not uniform and present several variations related to their procedures Thus we needed to carry out a process of information extraction and consolidation to create a proposal of a suite test There are some efforts in the directi
3. each of which is made up of two tones from the following selection 697 Hz 770 Hz 852 Hz 941 Hz 1209 Hz 1336 Hz 1477 Hz The tones are divided into two groups low and high and each DF signal uses one from each group This prevents any harmonics from being misinterpreted as part of the signal The DF test battery represents 1 9 of the test cases and it verifies if DF signals are recognized by the network In this way an example of DF test is Send DTMF command 1 B Emergency Call EC Many countries public telephone networks have a single emergency telephone number sometimes known as the uni versal emergency telephone number or occasionally the emer gency service number which allows a caller to contact local emergency services for assistance The emergency telephone number may differ from country to country It is typically a three digit number so that it can be easily remembered and dialed quickly The DF test battery represents 0 3 of the test cases and it verifies the network recognition of emergency calls in different situations An example of EC test is Make an emergency call without SIMCARD C International Mobile Equipment Identifier IE The International Mobile Equipment Identifier is a unique 15 digit number used by the GSM network to identify valid devices Such identifier appears on the label located on the 1 Amount of test case in each battery is not definitive as well as the amount of batteries itself
4. log i ental ewnonnansssion G CellB_ MS gt SS_ RACH CHANNEL REQUEST Verify the correct exhibition of the SPN at handset s display and verify the 2 Automatic Set the LOCATION UPDATE to cell B following message in the Anite Simulator lo G CellB SS gt MS_SDCCH 4_ LOCATION UPDATING ACCEPT i aia WAL 7 Verify the following message in the Anite Simulator log ae ile G CellB SSMS SDCCHM4 CALL PROCEEDING agua EE Verify the following message in the Anite Simulator log G CellB SS gt MS_FACCH CALL CONNECT Verify the following message in the Anite Simulator log 6 Automatic Execute a HANDOVER to the cell A G Cell A SS lt MS FACCH HANDOVER COMPLETE a a a m i Verify the following message in the Anite Simulator log lanual leactivate the voice cal G CellA MS gt SS FACCH DISCONNECT Verify the following message inthe Anite Simulator log 3 ME PEAIRT G Cell A_MS gt S _SDCCH 4_IMSI DETACH INDICATION Verify the following message in the playback window in the Anite Simulator 10 Automatic Deactivate cell A and cell B Verdict PASS Fig 2 Example of test case specification V DATABASING REAL SCENARIOS Network simulators provide basic cells that we can config ure to create scenarios according to specific needs However some carriers require the test performance in their own net works using their cells and parameter so that they can be sure if the handsets work properly in such networks To still perform the tests in la
5. short description about the main function of a test case Preconditions required initial conditions to the perfor mance of a test case References indicate the files such as the test scripts associated with a test case Estimated time average required time to perform a test case A list of n test case steps steps can be represented by the 4 tuple lt step technique procedure expected result gt where step is a sequential integer value technique spec ifies if the step is manual or automatic procedure is the description of the step and expected result is any verification to be checked on the handset display or on the simulator execution log Such concepts are organized in the template of Fig 2 in order to create the test cases Test cases can be directly used to lead the manual execution of the tests However considering the execution in a simulation environment they must be translated to simulation scripts and such translation is dependent of the representation language used by each simulator IDENTIFIER RF_TCOOS DESCRIPTION Handover between two 1800 MHz cells Handset with SIMCard and connected to Anite Simulator Both 1800 MHz cells must be created in the Anite Simulator and activated PLSCPOO1 pse 00 02 20 PRECONDITION REFERENCES ESTIMATED TIME STEPS TECHNIQUE PROCEDURE EXPECTED RESULT Verify the following message in the Anite Simulator
6. XXVI SIMPOSIO BRASILEIRO DE TELECOMUNICACOES SBrT 08 02 05 DE SETEMBRO DE 2008 RIO DE JANEIRO RJ A Proposal for Test Data Standardization for Handsets Evaluation in Simulated Networks Clauirton Siebra Paulo Costa Fabio Q Silva and Andr M Santos Abstract More thorough testing prior to deployment and a reduced time to market are competing objectives that handset manufacturers must try to optimize Thus the evolution of test methodologies with the use of simulation environments is an essential requirement to accelerate the product realization process One important issue for test simulation environments is to specify the test data that is going to be used during the simulation Such data can be classified into two groups the test case batteries and the set of cells parameters that compose a scenario Currently however we have neither a standard for a test suite that covers all the required tests for handsets certification nor a default benchmark of real world test scenarios This paper presents our approach to deal with both issues First we discuss our proposal to classify and specify tests cases so that we could generate a proper test suite for handsets network tests Then we present our experience in creating a database with real information about handsets network scenarios of several Brazilian sites Keywords Network simulation cells description test cases handsets technology Resumo A realiza o de teste
7. ation Update did not work properly To attenuate this problem we have changed some cells parameters turning them more friendly to Anite This action had some positive effects so that some operations such XXVI SIMPOSIO BRASILEIRO DE TELECOMUNICACOES SBrT 08 02 05 DE SETEMBRO DE 2008 RIO DE JANEIRO RJ as handovers between cells were possible However other operations were still presenting problems and we could not apply more changes to the cells because this action could lead to cells that do not represent the real world collected scenarios TEMS is an Ericsson tool that offers data collection real time analysis and post processing function One of the main aims of TEMS is to offer a multi vendor and multi technology support considering the major vendors e g Samsung Mo torola Nokia etc across multiple technologies e g GMS CDMA etc The collected data from TEMS is presented in real time and its interface allows users to filter network data and focus on relevant information for in depth analysis Differently from SAGEM the TEMS tool is composed by mobile a PC and GSM GPRS software that must be together during the data collection The import of TEMS data by Anite requires the use of a specific template which should ensure data compatibility between the two environments Unfortu nately ever using such template we were not able to create cells using the collected data in the Anite simulator NEMO is anothe
8. boratory we have decided to create a database with information of several real networks so that the simulator could load this data and run simulations of real scenarios This process is detailed in the next sections A Evaluation of Tools for Capture The first step to create a database with real network sce narios is to use a real time network monitoring tool that can capture information about cells and their parameters Such tools are referred here as Wireless Network Capture Tools WNCT and we have analyzed three of them SAGEM OT290 TEMS and NEMO SAGEM OT209 is a WNCT that was designed to support the validation of GSM and GPRS networks This tool is composed by a handset like hardware and a GSM GPRS software that enables the visualization recording and replay of all information The physical interface is based on standard serial interface which makes easier the use of the terminal in both trace and transfer modes SAGEM is able to store measurements made in real time without the need of an external memory device However its capability is limited so that it is important to continually download the data to a computer using the data interface in trace mode or using an infrared connection Apart its good usability we have found out problems of compatibility between the SAGEM data and the Anite simulator After loading the collected cells and configure the scenarios using such cells we have noticed that several operations such as Loc
9. bra Paulo Costa Fabio Q Silva and Andr M Santos CIn SIDI Samsung Laboratory of Research and Development Federal University of Pernambuco Recife Brasil E mails cas phrc fabio ams cin ufpe br The results presented in this paper have been developed as part of a collaborative project between Samsung Institute for Development of Informatics Samsung SIDI and the Centre of Informatics at the Federal University of Pernambuco CIn UFPE financed by Samsung Eletronica da Amazonia Ltda under the auspices of the Brazilian Federal Law of Informatics no 8248 91 supported by new mobile communication and computing de vices that offer a broad variety of resource and applications to users This has increased the pressure on the test stage of the process which is required to apply more extensive and efficient procedures of evaluation so that the final product meets the fast time to market goals and it can compete in the global marketplace Considering this fact the use of network simulators 1 in laboratory using a generated wireless network of low power is a trend in replacing the manual performance of tests which use real carriers networks Field testing However the appropri ate use of a simulation environment requires the specification of a test suite that is in fact able to testify the correctness of a handset in several situations and scenarios For that end the suite must consider the features of completeness it must cover a
10. er network However specific operations can be offered for just one carrier Note that this kind of evaluation do not test the user experience features of the device user interface performance of data applications battery life and others Rather network tests are mainly aimed at conformance protocol performance application enabler and radio components and interoperability testing XXVI SIMPOSIO BRASILEIRO DE TELECOMUNICACOES SBrT 08 02 05 DE SETEMBRO DE 2008 RIO DE JANEIRO RJ It is known that field testing can be costly mainly in terms of travel time and potential disruption to the network Such problems have motivated the development of simulation environments to wireless networks which support the perfor mance of a significant variety of network tests This work in particular is based on our experience with the Anite SAS network simulator 1 The simulation environment enables the handset to com municate within any network configuration of up to eight base stations under laboratory conditions A PC controller runs the network simulation software and controls the base station simulators Cells 1 and 2 The test sets interact with the handset under test via a normal RF interface Fig 1 and to test end to end communication the PC can be connected to Internet allowing data to be transmitted to the handset Using this configuration for example we can emulate a two cells scenario and perform tests that involve handovers
11. es Such messages do not require the handset to be active and within range and will be held for a number of days until the phone is active and within range The SM battery represents 7 4 of the test cases and it evaluates the SM service in several extreme situations such as full SIM card and handset memory An example of SM test case is Send a SMS with a 160 characters text using only letters and numbers M Enhanced Messaging Service EM Enhanced Messaging Service is an adaptation of the SM Service that allows users to send and receive ring tones and combinations of simple media In this way users can integrate text melodies pictures sounds and animations to enhance the expressive power of messages that are limited by the display constraints of mobile devices The EM battery represents 4 0 of the test cases and it evaluates the traffic of this media over the network as well as the correctness of its delivery to receivers An example of EM test case is Send a EMS and fill the text with no more than 160 characters including a picture Check if it is correctly received by its destination XXVI SIMPOSIO BRASILEIRO DE TELECOMUNICACOES SBrT 08 02 05 DE SETEMBRO DE 2008 RIO DE JANEIRO RJ N Multimedia Messaging Service MM Multimedia Messaging Service is a communication tech nology developed by 3GPP that allows users to exchange multimedia communications between handsets and other de vices This service is an extension and i
12. ions Magazine 40 4 104 111 2002 6 The 3rd Generation Partnership Project 3GPP AT com mand set for User Equipment UE 2007 Available in http www 3 gpp org ftp Specs html info 27007 htm
13. k such as the Location Area Identity LAI Another SIM function is to store a key identifying the handset service subscriber The use of SIM cards is mandatory in the GSM world so that their evaluation is part of the network test requirements In this way the SC battery represents 2 0 of the test cases and it basically verifies the SIM card capabilities An example of SC test case is Test the network lock by service provides T Bluetooth BT Bluetooth is a radio standard and communications protocol primarily designed for low power consumption with a short range 1 meter 10 meters or 100 meters based on low cost transceiver microchips in each device Bluetooth lets these devices communicate with each other when they are in range The devices use a radio communications system and they do not have to be in line of sight of each other The BT battery represents 7 1 of the test cases and an example of test is Verify that the handset discovers any devices situated nearby U Functionalities Test FT The FT battery considers several test cases that are not related to network validations however they are provided as a form to complete the handset validation This battery represents 1 4 of the test cases and an example is Create a welcome message and verify if it appears correctly when turn on the handset V E mail EL The ability of sending and receiving e mails is becoming a very common feature of handsets In the same way tha
14. ll the tests required for different carriers and test proceedings and generality it could be used to test any handset Note that different carriers each carrier provides a different wireless network usually require different test batteries which evaluate subsets of network operations Furthermore it is important that tests in laboratory can simulate real world scenarios This means the simulated cells must be configured according to information of real handsets networks The remainder of this paper discusses our approaches for dealing with these issues and it is organized as follows Section II introduces the handsets network test domain and presents an environment for networks simulation which enables the per formance of network tests in laboratory Section III discusses the specification and classification of test cases for handsets operating in such simulated networks Section IV describes the process of specifying test cases via a common template Section V presents our experience in creating a database with real world information about handsets network scenarios Finally Section VI concludes this work highlighting its main contributions and future directions of our research II NETWORK SIMULATION Network tests for handsets intend to verity if new devices are able to perform a set of operations pre defined by car riers The majority of such operations such as handovers and reselection of cells are default operations of any carri
15. mprovement of the EM service which supports for example transmission of streaming video Furthermore unlike SM and EM services the size of an MMS message is unlimited although service providers are likely to impose their own size restrictions To fully operate the MM service requires a 3G network Temporarily however this service has been based on the General Packet Radio Services GPRS which implies some limitations a good discussion about this evolution is presented in 5 The MM battery represents 13 9 of the test cases and we are considering the GPRS based operations while the 3G based battery 2 is part of our future extensions they are already mapped but not implemented An example of MM test case is Receive a MMS with subject Fill the image object with images of different sizes and formats GIF Animated GIF PNG and WBMP O Wireless Application Protocol WP The Wireless Application Protocol or WAP is an open international standard for applications that use wireless com munication Its principal application is to enable access to Internet from a handset The aim of the WP battery which represents 5 5 of the test cases is to evaluate the use of this protocol by the handset such as connection to WAP sessions and use of PDP Packet Data Protocol context An example of WP test case is Make a GPRS Detachment by handset s menu without having activated a PDP context P Browser BW A handset browser pro
16. n phone and data services They are all defined in GSM standards and some examples are Call Forwarding and Explicit Call Transfer The SS battery represents 4 6 of the test cases which evaluate such services An example of SS test case is Disable voice calls no reply forwarding by handset s menu J International Calls IC Normally before performing an international call from anywhere we need to know the appropriate International Direct Dial code IDD for the country that we are calling from With GSM however this is not necessary because most GSM phones have a special key feature that will automatically insert the correct IDD code appropriate to your current location The IC battery represents 0 6 of the test cases and one of their functions is to verify this key feature An example of IC test case is Make an international outgoing voice call K Unstructured Supplementary Service Data US Unstructured Supplementary Service Data is a GSM com munication technology that is used to send text between a mobile phone and an application program in the network Applications may include prepaid roaming or mobile chatting The US battery represents 0 2 of the test case and an example of such test is Verify if the USSD string is NOT in the dialed calls register L Short Message SM Short Message Service is a telecommunication protocol that allows the sending of short 160 characters or less text messag
17. on of unifying the performance of network tests via the creation of certifications centers These efforts vary with different technologies and geographies For example the procedure for evaluating the GSM technology is managed by the PCS Type Certification Review Board in the U S while the Global Certification Forum acts in other countries Furthermore groups like that also elaborate documents such as the 3GPPTS 51 010 1 which contains collections of test cases to handsets validation We have used documents like that to support and aggregate content to our test suite Note that this process of generating test cases is always in evolution For example the third generation mobile system 4 which is based on the evolved GSM Global System for Mobile Communications 3 core networks will require several new tests mainly associated with multimedia transfer communication Then after consolidating all the information from carriers and certification documents we have elaborated a classifica tion that currently has 25 test batteries The test cases were mainly classified according to technological aspects and kind of services that they are supposed to evaluate Details about the batteries battery characterization percentage of tests and examples are given in follow A Dual Tone Multi Frequency DF Dual Tone Multi Frequency better known as ftouch tone is a system of signal tones used in telecommunications There are twelve DF signals
18. r option for portable engineering tool designed for measuring and monitoring the air interface of wireless networks This tool is able to support measurements on GSM GPRS EDGE and WCDMA networks Our analysis has identified that NEMO is more flexible than TEMS and SAGEM because it permits the log files export in different format which means that the formats can be open and devel opers have more flexibility to work with the integration of the NEMO s data with other applications Another positive feature is the Quadri band capability of NEMO This means that it is able to collect data from 850MHz 900MHz 1800MHz and 1900MHz depending on the handset model However the principal fact related to NEMO is its ongoing integration with Anite environment which will enable a complete compatibility between these two environments B The Process of Capture The previous section raised out several features of the main tools for capture currently available in the market In fact the main aspect to lead the choice for a WNCT is its compatibility with the simulation environment in use The second step to create a database of real scenarios is to define the cycles of capture We define a cycle as a tuple lt route carrier gt where route defines a set of paths through where the data collection must be done and carrier identifies one of the carriers that operates in the region The main idea in defining a route is to consider that this route goes thro
19. s em celulares e a necessidade de um rapido lan amento de tais celulares no mercado s o objetivos conflitantes que os fabricantes devem otimizar Con sequentemente a evolu o das metodologias de testes com o uso de ambientes de simula o um requerimento essencial para acelerar o processo de produ o Um importante aspecto dos ambientes de simula o a especifica o dos dados de testes que v o ser usados durante a simula o Tais dados podem ser classificados em dois grupos as baterias de casos de testes e o conjunto de par metros das c lulas que comp em um cen rio Atualmente contudo n o existe um padr o para um conjunto de testes que cubra todos os testes requeridos para a homologa o de um aparelho nem uma biblioteca padr o de testes composta por cen rios do mundo real Este artigo apresenta nossa proposta para lidar com tais aspectos Primeiro n s discutimos nossa proposta para classificar e especificar casos de testes de forma que possamos gerar um apropriado conjunto de testes para celulares Ent o n s apresentamos nossa experi ncia em criar um banco de dados com informa o real sobre cen rios de redes para celulares em diversas regi es brasileiras Palavras Chave Simula o de redes Descri o de c lulas Casos de testes Tecnologia m vel I INTRODUCTION The handset development has evolved into a complex en gineering process mainly because of the current capabilities Clauirton Sie
20. t e mails are provided by normal computer desktops e mails from to handsets must consider a set of requirements such as text format and the capability to annex several types of file format such as figures and music files The EL battery which represents 8 0 of the test cases intends to evaluate all these functions related to e mail service for handsets An example of EL test is Send an email without subject with text and with attached sound files in different formats W Streaming ST Streaming is the kind of multimedia that is constantly received by and normally displayed to the end user while it is being delivered by the provider The name refers to the delivery method of the medium rather than to the medium itself The ST battery which represents 8 4 of the test cases XXVI SIMPOSIO BRASILEIRO DE TELECOMUNICACOES SBrT 08 02 05 DE SETEMBRO DE 2008 RIO DE JANEIRO RJ evaluates the ability of the handset in receiving this kind of media An example of ST test is Establish a streaming session with a server providing live content composed of video and audio where the audio is encoded using AMR NB and the video using H 264 MPEG4 AVC X UAProf UA The User Agent Profile UAProf specification is concerned with capturing capability and preference information for wire less devices This information can be used by content providers to produce content in an appropriate format for the specific device The evaluation of rela
21. t phonebook An example of PA test case is Delete a contact in SIMCARD s phonebook through the handset s menu F Air Signaling Tests RF Air Signaling or Radio Frequency tests are related to low level network operations such as cells selection re selection handovers and broadcast The RF battery represents 3 8 of the test cases and an example of such tests is Re selection between two 900 MHz cells from the same service provider simulating smooth power variation G Call Identification CI Call identification is a switching system feature that allows an attendant to visually identify the type of service or trunk group associated with a call directed to the attendant s posi tion The CI battery represents 2 4 of the test cases which deal with operations related to this kind of identification An example of CI test is Receive a voice call from an originator listed at the SIMCard s phonebook H Voice Call VC Voice call is the most common operation performed over the network and there are several situations that must be evaluated such as calls during handovers and using adaptive Multi Rate Codec AMR in full and half rate The VC category represents 5 2 of the test cases and an example is Make a voice call to a destination that does not have neither call waiting nor voice mail I Supplementary Services SS GSM supports a comprehensive set of supplementary ser vices that complement and support the mai
22. ted UAProf features is carried out by the UA battery whose tests account for 4 7 of the total number of tests An example of test is User Agent launched by MMS clients and URL of the UAProf Y Roaming Broker RB The Roaming Broker platform enables a GSM carrier to act as a hub for roaming traffic by policing signaling traffic in a centralized location It operates as an enhanced gateway with filtering rules tailored for roaming which enables carriers to act as brokers between roaming partners It also has additional interoperability and security mechanisms to simplify provi sioning maximize inter working and ensure network integrity All these features are considered by the RB battery which represents 2 6 of the test cases and an example of test is Location Update Reject PLMN Not Allowed at two 1900 MHz cells with PINI enabled IV TEST CASES SPECIFICATION The next step after the test cases classification is to identify and organize the common concepts related to test cases so that they can be represented in a unified way From our analysis we have defined the following concepts Test Case Identifier a unique key that identifies a test case TC among all the test cases collection The pattern proposed in our project is lt xx_TCyyy gt where xx represents the battery identifier and yyy represents the TC number For example SM_TC003 is the third test case of the Short Message SM battery Description a
23. to work closer with network carriers to develop a certi fication program that ensures full interoperability considering the particular features of the Brazilian networks ACKNOWLEDGES The authors would like to thank all the test engineers of the CIn SIDI Samsung Test Center Amanda Araujo Anniele Costa and Ronaldo Bitu which provided the technical details about the handsets network test domain simulation environ ment and GSM principles The team is also grateful for the support received from Samsung SIDI team in particular from Ariston Carvalho Miguel Lizarraga Ildeu Fantini and Vera Bier The National Council for Scientific and Technological Development CNPq has provided valuable support to the project through the Brazilian Federal Law no 8010 90 REFERENCIAS 1 Anite SAS 12447D UMOOI GSM 900 DCSI800 PCS 1900 Stand Alone Simulator User Manual rel 3 0 Anite Telecoms Ltd Fleet Hampshire UK 1999 2 V Garg Wireless Network Evolution 2G to 3G Prentice Hall 2001 3 M Rahnema Overview of the GSM system and protocol architecture IEEE Communications Magazine 42 4 493 502 1993 4 The 3rd Generation Partnership Project 3GPP Mobile Station MS conformance specification Part 1 Conformance specification 2006 Available in http www 3gpp org ftp Specs html info 5 1 series htm 5 J De Vriendt P Laine C Lerouge and X Xiaofeng Mobile network evolution a revolution on the move IEEE Communicat
24. ugh representative locations in terms of cells diversity and network traffic Note that these locations are associated with a carrier so that the same route may not be valid for two or more carriers Fig 3 shows an example of route defined to capture data from four important sites of a carrier in the city center of S o Paulo Currently we have collected information about 34 cycles considering 12 cities and 6 different carriers The data capture for this set of cycles must be carried out at least once a year so that the database can actually represent the current state of real cells and scenarios Fig 3 Example of route considering important sites of a specific carrier VI CONCLUSIONS AND DIRECTIONS This paper has two main contributions First a proposal for classification and specification of handsets network test cases Second a discussion about important steps for the database creation of real wireless network scenarios Both contributions are initial efforts towards the definition of a standard process for certification of handsets similar to those carried out by the PCS Type Certification Review Board PTCRB or Global Certification Forum GCF In fact there is a lack in Brazil of such kind of service so that the task of certification is usually performed by the carriers themselves Future efforts of this work aim to provide a complete test suite and database of network scenarios for handset certification For that end we need
25. vides all of the basic services of a computer based web browser but simplified to operate within the restrictions of a handset In this way the BW battery represents 8 2 of the test cases and it accounts for evaluating such services An example of BW test case is Go to a WML URL test and check correct visualization and execution of buttons and inputs elements Q AT Commands AT Most GSM UMTS handsets include an internal modem which recognizes AT commands Thus several operations defined in the 3GPP TS 27 007 specification 6 can be per formed using such commands For example standard phone book access or short messages SMS sending modification and deletion The AT battery which represents 4 4 of the test cases considers these operations and an example is Initiate a voice call using ATD command R Java JV During the last years Java is increasing its role as handset platform One of the reasons is the popularization of J2ME Java 2 Micro Edition as development language for handsets This justifies the specification of a JV battery whose tests cases evaluate the ability of handsets to download and execute Java applets At the moment the JV battery represents 0 2 of the test cases and an example of such tests is Make a Java Application download and test it S SIM_Card SC A Subscriber Identity Module SIM is a removable smart card that stores network state information which is broadcast to it from the networ
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