PCT
`
`WORLD INTELLECTUAL PROPERTY ORGANIZATION
`International Bureau
`
`
`
`WO 99/41920
`
`INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT)
`
` (11) International Publication Number:
`(51) International Patent Classification 6 :
` A1
`
`H04Q 7/32
`
`
`(43) International Publication Date: 19 August 1999 (19.08.99)
`
`
`
`
`(21) International Application Number:
`PCT/H99/00094
`(22) International Filing Date:
`9 February 1999 (09.02.99)
`
`
`
`
`(30) Priority Data:
`
`12 February 1998 (12.02.98)
`FI
`980316
`
`
`(71) Applicant (for all designated States except US): NOKIA MO-
`
`
`BILE PHONES LTD. [FI/FI]; Keilalahdentie 4, FIN—02150
`
`Espoo (Fl).
`
`
`(72) Inventors; and
`
`
`(75) Inventors/Applicants (for US only): HAMALAINEN, Jari
`
`
`[FI/FI]; Nallekarhuntie 20, FIN—36100 Kangasala (Fl).
`PASANEN, Jari [FI/FI]; Nivarinkatu 8 G 14, FIN—33610
`
`
`Tampere (Fl).
`
`
`(81) Designated States: AL, AM, AT, AT (Utility model), AU, AZ,
`BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, CZ (Utility
`model), DE, DE (Utility model), DK, DK (Utility model),
`EE, EE (Utility model), ES, FI, FI (Utility model), GB, GD,
`GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP,
`KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK,
`MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI,
`SK, SK (Utility model), SL, TJ, TM, TR, TI‘, UA, UG, US,
`UZ, VN, YU, ZW, ARIPO patent (GH, GM, KE, LS, MW,
`SD, SZ, UG, ZW), Eurasian patent (AM, AZ, BY, KG, KZ,
`MD, RU, TJ, TM), European patent (AT, BE, CH, CY, DE,
`DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE),
`OAPI patent (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML,
`MR, NE, SN, TD, TG).
`
`Published
`With international search report.
`Before the expiration of the time limit for amending the
`claims and to be republished in the event of the receipt of
`amendments.
`
` (74) Agent: TAMPEREEN PATENTTITOIMISTO OY; Hemli-
`
`ankatu 6, FIN—33720 Tampere (Fl).
`
`
`
`(54) Title: DATA TRANSMISSION BETWEEN COMMUNICATION DEVICES IN A MULTIMEDIA SYSTEM
`
`
`
`(57) Abstract
`
`in which
`The invention relates to a method for data transmission between communication devices in a communication network,
`method a data transmission connection is set up between a first communication device and a second communication device. In the method
`of the invention, parameter data on the multimedia properties of the first communication device is transmitted from the first communication
`device to the communication network, and the parameter data is transmitted in the communication network to the second communication
`device. According to an advantageous embodiment of the method, the multimedia information to be transmitted to the first communication
`device, such as graphic, audio, video, or presentation format information, is converted in the second communication device on the basis of
`the parameter data.
`
`
`
`1
`
`AT&T - Exhibit 1007
`
`SOLOCRON_PRIOR_ART 00004917
`
`1
`
`AT&T - Exhibit 1007
`
`

`

`FOR THE PURPOSES OF INFORMATION ONLY
`
`Spain
`Finland
`France
`Gabon
`United Kingdom
`Georgia
`Ghana
`Guinea
`Greece
`Hungary
`Ireland
`Israel
`Iceland
`Italy
`Japan
`Kenya
`Kyrgyzstan
`Democratic People’s
`Republic of Korea
`Republic of Korea
`Kazakstan
`Saint Lucia
`Liechtenstein
`Sri Lanka
`Liberia
`
`Lesotho
`Lithuania
`Luxembourg
`Latvia
`Monaco
`Republic of Moldova
`Madagascar
`The former Yugoslav
`Republic of Macedonia
`Mali
`Mongolia
`Mauritania
`Malawi
`Mexico
`Niger
`Netherlands
`Norway
`New Zealand
`Poland
`Portugal
`Romania
`Russian Federation
`Sudan
`Sweden
`Singapore
`
`ML
`MN
`MR
`MW
`MX
`NE
`NL
`NO
`NZ
`PL
`PT
`RO
`RU
`SD
`SE
`SG
`
`KR
`KZ
`LC
`LI
`LK
`LR
`
`ZW Slovenia
`
`Codes used to identify States party to the PCT on the front pages of pamphlets publishing international applications under the PCT.
`ES
`Albania
`LS
`FI
`Armenia
`LT
`FR
`Austria
`LU
`Australia
`GA
`LV
`GB
`MC
`Azerbaijan
`MD
`GE
`Bosnia and Herzegovina
`Barbados
`GH
`MG
`GN
`MK
`Belgium
`Burkina Faso
`GR
`HU
`Bulgaria
`Benin
`IE
`Brazil
`[L
`IS
`Belarus
`IT
`Canada
`JP
`Central African Republic
`KE
`Congo
`Switzerland
`KG
`KP
`COte d’Ivoire
`Cameroon
`China
`Cuba
`Czech Republic
`Germany
`Denmark
`Estonia
`
`SI
`SK
`SN
`SZ
`TD
`TG
`TJ
`TM
`TR
`TT
`UA
`UG
`US
`UZ
`VN
`YU
`
`Slovakia
`Senegal
`Swaziland
`Chad
`Togo
`Tajikistan
`Turkmenistan
`Turkey
`Trinidad and Tobago
`Ukraine
`Uganda
`United States of America
`Uzbekistan
`Viet Nam
`Yugoslavia
`Zimbabwe
`
`SOLOCRON_PRIOR_ART 00004918
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`WO 99/41920
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`PCT/FI99/00094
`
`DATA TRANSMISSION BETWEEN COMIVIUNICATION DEVICES IN A
`MULTDVIEDIA SYSTEM
`
`The present invention relates to a system in data transmission between
`
`communication devices in a communication network as set forth in the
`
`preamble of claim 1. The present invention relates also to a mobile sta-
`
`tion as set forth in the preamble of claim 10. Further, the present inven-
`tion relates to a communication device as set forth in the preamble of
`dmmll
`
`The number of mobile stations, such as mobile terminals and particu-
`larly personal portable mobile phones in use has constantly increased.
`These devices operate in a modern public land mobile network (PLMN)
`based on a cellular network, such as the standardised GSM system
`(Global System for Mobile Communications) as well as the GSM 1800
`and PCS 1900 systems. Also, network operators endeavour to develop
`their services offered to users of mobile stations. Such a service is e.g.
`the providing of data transmission connections to services of not only a
`public switched telephone network (PSTN) but also a general packet
`data network (PDN) and an integrated services digital network (ISDN).
`By using these data transmission connections, e.g. providers of serv-
`ices in the lNTERNET network can develop their services to users of
`mobile stations, such as mobile phones and portable personal comput-
`ers (PC) that can be coupled to them e.g. by means of PCMCIA cards.
`
`The increased use of multimedia applications sets demands on not only
`the PSTN network but also particularly to systems of wireless commu-
`nication networks, such as the PLMN network. Thus, the systems must
`be applicable to the transmission of not only text and data but also
`graphics, audio and moving images. Applications include video nego-
`tiations,
`real-time transmission of video images in connection with
`medical examinations,
`transmission of high-resolution images, com-
`munication in INTRANET networks of enterprises,
`interactive games,
`and transmission of music. These applications are particularly charac-
`terised by their demand of a connection with a communication capacity
`that is sufficiently quick also momentarily between the communication
`devices in the communication network, and by the fact that the data
`transmission is often conducted in short sequences.
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`For example in the GSM system, data transmission between communi-
`cation devices, such as a mobile station and a base stations, on one
`logical radio channel is conducted at the rate of 9.6 kbit/s. Also a high
`speed circuit switched data (HSCSD) service has been developed for
`the GSM system, where the data transmission capacity is as high as
`64 kbit/s. Thus, this service uses all the eight logical radio channels of
`the physical radio channel for data transmission between the mobile
`station and the base station. In this way, the user of the mobile station
`can be offered digital services to the lSDN network and the communi-
`cation devices of its service providers at a rate of 64 kbit/s. Another
`system based on the GSM system is the general packet radio service
`GPRS system. This system improves the efficiency of communication,
`because the same logical radio channel can be used by several differ-
`ent mobile subscribers. For example, data transmission between a
`mobile station and a base station takes place only when necessary, and
`the logical radio channel is not reserved for communication between
`only one mobile station and base station. There is so-called virtual data
`transmission connection between the mobile station and the GPFlS
`system. The data transmission capacity of the current GPRS system on
`one logical
`radio channel
`is as high as 21 kbit/s, and as high as
`171 kbit/s when all the logical radio channels are used. Future systems
`supporting wireless multimedia include the wide-band UMTS system
`(Universal Mobile Telecommunications System) aiming at high speed
`which can momentarily be even several Mbit/s.
`
`For using multimedia services, a communication device, such as a
`mobile station, sets up a data transmission‘connection with a PLMN
`network and the server of the communication device of this network
`providing the multimedia services. Such a service may be a message
`service, which indicates the short message transmission service (SMS)
`as well as the paging service. The communication device with its server
`
`can also be located in another PLMN network.
`
`All the communication devices of a communication network, such as
`the mobile stations connected with a PLMN network, do not have such
`properties that they would support eg. faster data transmission con-
`nections or data transmission in packet form. However, it must be pos—
`sible to use also devices of older generations and with limited options in
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`a communication network supporting communication devices with more
`varied options. Consequently,
`the network connects simultaneously
`conventional mobile phones which,
`in addition to transmission of
`speech, support only data transmission in text form, such as SMS mes-
`sages, and wireless communication devices with which it is possible to
`use e.g. services of the INTERNET network. One wireless communica-
`tion device with varied properties is Nokia Communicator 9000,
`in
`which the properties of a cellular mobile telephone (CMT) and a per-
`sonal digital assistant (PDA) are combined. Wireless communication
`devices that can be applied for the use of future multimedia, Ila. multi-
`media communication devices, are suitable for the reception of graph-
`ics, audio as well as moving images. Communication devices that can
`be connected to the PSTN network and are under development include
`for example telephones transmitting calls via the INTERNET network,
`which transmit also video images.
`
`One problem with the prior art is that the communication devices of
`service providers in a communication network do not know all the prop-
`erties of the receiving communication device. Thus, for example a
`server offering multimedia services may transmit information to a mo-
`bile station, a communicator or a wireless multimedia communication
`device in a form that is not compatible with the device, or the informa-
`tion cannot be received at all. Thus, for example, the precision,
`/.e.
`resolution of the graphics to be transmitted may be too high for the re-
`production capacity of the display of the receiving device; the moving
`video image or image information to be transmitted is coded in a form
`that is not recognised by the receiving device; or the interactive appli-
`cation contains e.g. a form to be filled in but entering data is not possi-
`ble with the receiving device. However,
`if data transmission is con-
`ducted in spite of the above-mentioned problems of prior art, this will
`result in a waste of capacity available in the communication network.
`The problems of the receiving device, due to incompatibility, will lead to
`failure situations or delays in the network, which load or hamper other
`communication in the network.
`If the multimedia service is available
`only in a receiving communication device with certain options, this will
`have the result that either the user of the device will not receive the
`desired services, the device must be replaced with a suitable one, or
`several devices must be acquired for using different services.
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`SOLOCRON_PRIOR_ART 00004921
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`
`The purpose of the present invention is to eliminate the drawbacks of
`prior art and to achieve a considerable improvement in data transmis-
`sion between communication devices in a communication network.
`More precisely, the method of the invention is characterised in what will
`be presented in the characterising part of claim 1. The mobile station of
`the invention is characterised in what will be presented in the character-
`ising part of claim 10. The communication device of the invention is
`characterised in what will be presented in the characterising part of
`claim 11.
`
`The essential principle of the invention is that multimedia information is
`transmitted e.g. from a server offering multimedia services to another
`communication device, such as a mobile phone, communicator or mul-
`timedia communication device, only in a form in which the receiving
`communication device can utilise it. For this purpose, the method of the
`invention is created 9.9. for transmitting parameter data describing the
`multimedia properties of a multimedia communication device and for
`modifying multimedia information for this multimedia communication
`device. In the following, the invention will be described in more detail by
`using several examples for implementing the method in a communica-
`tion network.
`
`The invention gives several considerable advantages related to the op-
`eration of the communication network, such as a PLMN network, as
`well as advantages obtained by the mobile subscriber. The most impor-
`tant advantage is that by using the method of the invention, it is possi-
`ble to improve the efficiency of data transmission between communica-
`tion devices so that the properties of the receiving device, such as a
`wireless multimedia communication device, are taken into account in
`data transmission in a wider manner than in prior art. Thus, the capacity
`of the communication network is not wasted unnecessarily, whereby the
`data transmission is optimised almost according to each subscriber.
`Another advantage is that the communication network supports devices
`of different options, whereby also the time of use of mobile stations is
`prolonged and their possibilities of use are improved. Moreover, the
`problems of incompatibility of devices in the communication network
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`are reduced, and error situations and delays loading the communication
`network are reduced in view of prior art.
`
`In the following, the invention will be described in more detail with ref~
`erence to the appended drawings, in which
`
`Fig. 1
`
`is a schematic view showing a general mobile communica—
`tion network based on a cellular network,
`
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`Fig. 2
`
`shows a mobile station that can be used in the mobile com-
`munication network shown in Fig. 1,
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`Fig. 3
`
`Fig. 4
`
`is a schematic view illustrating the transmission of parame-
`ter data describing the multimedia properties of a mobile
`station during setting up of a call by using an advantageous
`embodiment of the method of the invention. and
`
`is a schematic view illustrating the transmission of parame-
`ter data describing the multimedia properties of a mobile
`station during setting up of a call by using another advanta-
`geous embodiment of the method of the invention.
`
`As shown in Fig. 1, the public land mobile network (PLMN) based on a
`cellular network, such as the GSM system, comprises,
`in a known
`manner, several communication devices, such as mobile stations (M8)
`M81—M84 and a base station subsystem 888. This base station sub-
`system comprises usually several base transceiver stations (BTS)
`BT81, BT82 and BT83 which are distributed into a geographical area
`and each base transceiver station serves a cell comprising at least part
`of this geographical area. Communication, such as transmission and
`reception of speech and data, between a mobile station M81 located in
`the area of the cell served by the base transceiver station BT81, and
`the base transceiver station BT81 takes place via radio communication
`RC1 by using radio channels reserved for the cell. The operation of the
`base transceiver stations BT81 and BT82 is controlled by a base sta-
`tion controller (880) BSC1 belonging to the base station subsystem
`888 and serving the purpose of controlling the use of radio channels
`and controlling channel changes. The base station controller BSC1
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`communicates with a mobile services switching centre (MSG) MSC1
`which serves the purpose of transmitting connections between the base
`transceiver stations BTS1—BTSS coupled therewith,
`to other mobile
`services switching centres, such as MSC2, a public switched telephone
`network PSTN, and further via the PSTN network to its communication
`devices, such as a communication device S1. The communication de-
`vice comprises for example a telecommunication terminal, such as a
`modem TE1, and a data processor, such as a computer used as a
`server SERVER1. The communication devices of the PSTN network
`have usually their own telephone number, and in the data transmission
`connection set up, data transmission of the PSTN network takes place
`9.9. by means of frequency shift keying (FSK) modulation or dual tone
`multi-frequency (DTMF) control of modems. in the communication de-
`vice Sf, data transmission and applications, such as the communica-
`tion software, are controlled by the control software of the communica-
`tion device S1, whereby this control software can be used for transmit-
`ting data e.g. between the modem TE1 and the computer used as a
`server SERVER1. For illustrating the invention, Fig. 1 shows only the
`mobile
`stations MS1—MS4
`and the base transceiver
`stations
`BTS1—BTS3, but in a known manner, the system comprises usually a
`large number of mobile stations as well as base transceiver stations
`serving the same. The system usually comprises also more than two
`mobile services switching centres MSC1 and MSC2. Moreover, a PSTN
`network comprises several communication devices that can be coupled
`with it via different telephone operators.
`
`Further, with reference to Fig. 1, the mobile services switching centre
`MSC1 maintains information on the location of the mobile stations
`MS1—MS4 in the area of cells of
`the base transceiver stations
`BTS1—BTSS by means of a home location register HLR and a visitor
`location register VLR. These registers HLFl and VLR contain for in-
`stance the telephone number and the international mobile subscriber
`number (IMSI) of the mobile station. The home register HLR contains
`information on mobile stations registered in the mobile services switch-
`ing centre MSC1 and their locations. The visitor location register VLR
`contains information on the mobile stations which are temporarily regis—
`tered in the mobile sen/ices switching centre MSC1. Different mobile
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`services switching centres exchange this information for maintaining
`data transmission in a mobile communication network.
`
`With reference to Fig. 1, if the public land mobile network PLMN based
`on a cellular network and its communication devices, such as mobile
`stations MS1—MS4, are compatible with the GSM GPFlS system, the
`network comprises also at
`least one serving GPRS support node
`SGSN1, communicating with a base station controller, such as the base
`station controller BSC2, as well as a gateway GPRS support node
`GGSN1 communicating with the same. The support node GGSN1 is
`the support node which the general packet data network PDN commu-
`nicates with. Communication devices in this PDN network, such as the
`communication device 82, comprise a telecommunication terminal,
`such as a modem TE2, and a data processor, such as a computer used
`as a server SERVERZ. The support node GGSN1 contains information
`for addressing the protocol data units (PDU) entering from the PDN
`network to the serving GPRS support node which the communication
`device, such as mobile station MS4, communicates with. These data
`packets comply with the protocol definition of the data transmission
`connection, such as the internet protocol (lP), X.25 or CLNP, and they
`contain also the address of the destination communication device. The
`support nodes can support several protocol definitions for connections
`of a landline PDN network, and they are usually selected by the net—
`work operator. The support nodes GGSN1 and SGSN1 can also be lo-
`cated in the same device. The GPRS register GR contains information
`about mobile stations registered in the support node GGSN1, such as
`their IMSI identifications and addresses for addressing the PDU data
`packets in the network. The serving GPRS support node usually com-
`municates also with the mobile services switching centre, such as the
`support node SGSN1 with the mobile services switching centre MSC1
`according to Fig. 1, for making data exchange possible. The mobile
`services switching centre MSC1 transmits e.g.
`information on mobile
`stations registered therein to the support node SGSN1.
`
`Of the existing frequency range for radio connections, only an allocated
`frequency band is available to the mobile communication network, and
`further, as shown in Fig. 1, part of this is used by the radio channel in-
`tended for communication between the base station BT81 and the
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`mobile station M81 by means of radio communication RC1. Usually,
`there are several radio channels available for use by the base trans-
`ceiver station BT81 for communication between several mobile stations
`M81 and M83 and the base transceiver station BT81. For example in
`the digital GSM system, there are 124 radio channels available, with a
`difference of 200 kHz.
`in analog frequency division multiple access
`(FDMA) systems of prior art, such as AMPS (Advanced Mobile Phone
`Service) and NMT (Nordic Mobile Telephone),
`the above-described
`system is used, whereby each radio channel is allocated its own fre-
`quency band, Le. a so-called physical radio channel is formed.
`
`The physical radio channelis further divided in the time domain into
`logical radio channels, whereby each logical radio channel is allocated
`its own time span in the time domain. Thanks to this arrangement, the
`same physical radio channel can be used in data transmission between
`several mobile stations, such as the mobile stations M81 and M83 and
`the base transceiver station BT81 in Fig. 1. In digital time division mul-
`tiple access (TDMA) systems of prior art, such as D-AMPS, GSM and
`JDC/PDC, the above-described system is used for dividing a physical
`radio channel in the time domain into logical radio channels. For exam—
`ple in the digital GSM system, the physical radio channel is divided into
`eight logical radio channels. Usually also the logical radio channels are
`further divided into traffic channels (TCH) which are used for the
`transmission of 9.9. speech and data, and control channels which are
`used for the transmission of messages of the network and messages
`for maintaining the network and the radio channels. An example of a
`control channel is the common control channel CCCH.
`
`Other communication systems include digital code division multiple ac-
`cess CDMA systems, such as the present 18-95 and future wideband
`code division multiple access (WCDMA) systems.
`
`Figure 2 is a reduced block chart showing the mobile station MS avail-
`able for use in the system of Fig. 1. The block chart shows primarily the
`blocks which are important for disclosing the present invention.
`It
`is
`obvious that the mobile station of the sender, such as the mobile station
`M81 shown in Fig. 1, and the mobile station of the recipient, such as
`the communicator M84 shown in Fig. 1, are not necessarily similar to
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`each other. The control unit 5 consists of 9.9. a micro controller unit 5a
`(MCU) and an application specific integrated circuit 5b (ASlC). Further,
`the mobile station MS contains a keypad 6, a display 7, an ear piece 8,
`a microphone 11, memory means 9 consisting 6.9. a non-volatile read—
`only memory (ROM) for storing programs and a random access mem-
`ory (RAM) for storing information during the operation of the mobile
`station MS. More, the mobile station MS comprises a radio part 2 with
`the necessary means for setting up a connection and transmitting in-
`formation between the mobile station MS and the mobile communica-
`tion network. Figure2 shows also a SIM card 14 and means 15 for
`connecting the SIM card to the mobile station MS. The mobile sta-
`tion MS, usually a mobile phone, can also be used in connection with a
`data processor 17, such as a PC device or a PDA device, as a so-
`called wireless modem. Thus the mobile station MS comprises also
`means 16 for connecting the data processor 17 with the mobile sta-
`tion MS. The data processor 17 is used for setting up a data transmis-
`sion connection by means of the mobile station MS and the mobile
`communication network to another communication device, such as the
`mobile station M82 or the communication device St formed by a mo-
`dem TE1 and a computer SERVERt in Fig. 1. With reference to Fig. 1,
`for example the mobile stations MS1—MS4 operating in the GSM sys-
`tem must have at least one SIM module (subscriber identity module)
`containing also a memory for storing subscriber-specific identification
`data of the mobile subscriber of the mobile station. This identification
`data includes the IMSI identification and the telephone number of the
`mobile subscriber. Also, messages transmitted by the short message
`services (SMS) of the mobile communication network can be stored in
`the memory of the SIM module. Moreover, the address of the visitor lo-
`cation register (VLFI) for maintaining the information on the mobile sta-
`tion can be temporarily stored in the SIM module. By means of the sub-
`scriber-specific identification data, messages and calls from other mo—
`bile stations or a public land telephone network can be addressed to
`the correct mobile station. The operation of the mobile station is prior
`art to a man skilled in the art, whereby its disclosure in more detail will
`be rendered unnecessary in this context.
`
`The method of the present invention can be applied in presently avail-
`able mobile stations in a way that the operations of the method to be
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`SOLOCRON_PRIOR_ART 00004927
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`WO 99/41920
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`PCT/F199/00094
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`carried out in the mobile station are conducted in the operational soft-
`ware of the mobile station. Thus, no changes will be needed in the
`hardware of the mobile station. The values of the parameters describ-
`ing the multimedia properties of the mobile station can be stored e.g. on
`the SIM card, from which they are read, when necessary, by the opera-
`tional software of the mobile station to be transmitted to the communi-
`cation network. The values of the parameters can be located also in the
`ROM or RAM memory of the mobile station. Application of the method
`will also require changes in the communication network, for example in
`the operational software of the mobile services switching centre.
`
`there are so-called communication
`According to known technology,
`protocol definitions, such as IP and X25, by means of which terminal
`devices can agree on e.g. the transmission rate to be used. From the
`PLMN network,
`it
`is known to use standardised communication be-
`tween the mobile station and the base transceiver station, such as the
`CLASSMARK_ENQUlRY message of the GSM system and the AT-
`TACH_REQUEST message of the GPRS system. These messages are
`intended for adaptation of the mutual operation of the terminal devices
`of the network and for setting up a data transmission connection, which
`is intended only for transmission of data to be conveyed. By means of
`the protocol definition, it is secured that the data is transmitted correctly
`from the source host to the destination host. By means of the data
`transmission connection set up, however, the actual data to be trans-
`mitted between e.g. application software of communication devices is
`not optimised on the basis of this information, e.g. for reducing the
`resolution of graphics to be transmitted or for changing the coding of a
`video image to be transmitted. it is the purpose of the method accord-
`ing to the invention to provide a way for transmitting this information
`from a mobile station e.g. to the data processor of a communication
`device producing multimedia services.
`
`In the following, the application of the method of the invention will be
`described in detail in mobile communication networks complying with
`the GSM GPRS and the GSM standards, but it will be appreciated by a
`man skilled in the art that the method can be applied in also other mo-
`bile communication networks based on a cellular network within the
`scope of the claims.
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`SOLOCRON_PRIOR_ART 00004928
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`wo 99/41920
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`PCT/FI99/00094
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`Properties of the receiving communication device, such as a mobile
`phone, communicator or multimedia communication device, affecting
`the use of above-mentioned multimedia services include for example:
`— parameters MM1 (e.g. resolution) of the display of the communi—
`cation device,
`— image coding methods supported by the communication device,
`and their parameters MM2,
`— audio coding methods supported by the communication device
`and their parameters MM3,
`service-specific data transmission rate MM5,
`service-specific data transmission mode MMG (e.g. SMS, HSCSD,
`GPRS)
`— maximum data transmission rate MM7 of the data transmission
`mode,
`
`——
`——
`
`— maximum size MMB of the graphic files,
`——
`number MM9 of colours of the graphics,
`— properties MM10 of the keypad of the data transmission device,
`and
`
`— properties MM11 of the control device (e.g. mouse, pointer ball,
`joystick) of the communication device,
`— lNTERNET presentation modes MM12 (9.9. Java, HTML versions)
`supported by the communication device.
`
`As shown in Fig. 3, a mobile originated call is set up in a mobile com»
`munication network complying with the GSM standard according to
`prior art so that the mobile station and the GSM network communicate,
`i.e. transmit the control and identification data required for call set-up.
`In response to a call set-up request, the mobile station is allotted a ra-
`dio channel for signalling,
`if this is possible within the capacity of the
`network. On this channel, the mobile station requests (CM_SERVICE_
`REQUEST) for desired speech or data sen/ice from the network. On
`the network side,
`this request is transmitted via a base transceiver
`station to a mobile services switching centre, where the rights of the
`mobile subscriber in question are found out from the visitor location
`register. In a SETUP message, the mobile station gives the telephone
`number to which it wants a connection. This telephone number can
`belong e.g. to a communication device offering multimedia services,
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`SOLOCRON_PRIOR_ART 00004929
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`WO 99/4192!)
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`1 2
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`PCT/FI99/0009
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`4
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`located also in the same PLMN network, a PSTN network or a PDN
`network. The network starts a routing process for setting up a
`connection to the address given in the telephone number (CALL_
`PROCEEDING). When Successful, a connection is set up (CONNECT_
`ACKNOWLEDGE) and data transmission can be started on the radio
`channel reserved for it.
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`According to a first advantageous embodiment of the method of the in-
`vention, the mobile station transmits on the radio channel a message
`(MM_CAPABlLlTlES) consisting of the parameters MM1—MM12 de-
`scribing the multimedia properties of the mobile station to the mobile
`services switching centre which acknowledges the receipt of this data
`(MM_CAPABILlTlES_ACKNOWLEDGE). For
`this purpose,
`the re-
`quired determined messages are created between the mobile station
`and the mobile services switching centre. The mobile services switch-
`ing centre transmits the message (MM_CAPABlLlTlES) consisting of
`the parameters MM1—MM12 describing the multimedia properties of
`the mobile station further to the communication device, which also ac-
`knowledges the receipt of this data (MM_CAPABILIT|ES_ACKNOWL-
`EDGE). For this purpose, a protocol definition, such as IP or X.25,
`is
`made between the mobile services switching centre and the communi-
`cation device. It is obvious that the messages used for transmitting the
`parameters and the acknowledgements on the receipt of the messages
`can vary in their contents depending on whether the messages were
`transmitted between the mobile station and the mobile services
`switching centre or between the mobile services switching centre and
`the communication device. On the basis of the received data,
`the
`server of the communication device conducts optimisation of the data
`to be transmitte