PCT
`
`
`
`
`
`PROPERTY ORGANIZATION
`WORLD 1NTEUECI1JAL
`
`International Bureau
`
`
`
`INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT)
`
`6 :
`(51)International Patent Classification
`
`
`
`
`
`(11)International Publication Number:
`WO 95/08900
`
`
`
`H04Q 7 /22, H04L 12/28
`
`
`
`30 March 1995 (30.03.95)
`Al
`
`(43)International Publication Date:
`
`
`
`
`
`(81)Designated States: AU, CN, DE, GB, JP, US, European patent
`(21)International Application Number: PCT/FI94/00413
`(AT, BE, CH, DE, DK, ES, FR, GB, GR, IE, IT, LU, MC,
`1994 (19.09.94) NL, PT, SE).
`(22)International Filing Date:19 September
`
`
`
`(30)Priority Data:
`
`
`
`Published
`934115 20 September 1993 (20.09.93)
`FI
`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.
`(71)Applicant
`States except US): NOKIA
`(for all designated
`
`
`In English translation (filed in Finnish).
`
`
`TELECOMMUNICATIONS OY [Fl/Fl]; Mlilckyllin puis­
`
`totie 1, FIN-02600 Espoo (Fl).
`
`(72)Inventors; and
`
`(75)Inventors/Applicants (for US only): W ARSTA, Markus
`12 A 3, FIN-04230 Kerava
`[FI/Fl]; Kurkelankatu
`(Fl).
`
`JOKIAHO, Timo [FI/Fl]; Raappavuorenkuja 1, FIN-01620
`V antaa
`(Fl).
`
`(74)Agent: . OY KOLS'IER AB; lso Roobertinkatu 23, P.O. Box
`
`
`
`
`148, FIN-00121 Helsinki (Fl).
`
`(54)Title: A MOBILE COMMUNICATION SYS'IEM AND A METHOD FOR CONNECTING A REMOTE WORKSTATION TO A
`
`
`
`
`DATA COMMUNICATION NETWORK VIA A MOBILE COMMUNICATION NETWORK
`
`(57)Abstract
`
`A mobile communication system and a method for connecting a remote workstation to a data network via a mobile communication
`
`
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`
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`network. The invention allows a remote workstation (3, 4) to be connected more flexibly over the radio path by providing a special
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`interconnecting computer (19) in conjunction with the mobile exchange (10, 15) for extending the connection to a destination data network
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`
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`(24). The interconnecting computer (19) thus acts as a bus between the remote workstation using the mobile communication network and
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`
`
`
`its home data network, simulates the operation of the remote workstation towards the data network (24), and takes care of the real remote
`
`
`
`
`
`workstation (3, 4 ), which is behind the radio path. A data connection established over the radio path can be released so as to minimize the
`
`
`
`
`air time when the radio path is not needed for telecommunication, but the interconnecting computer (19) keeps the extended connection
`
`active towards the data network.
`
`Ex.1041
`APPLE INC. / Page 1 of 21
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`FOR THE PURPOSES OF INFORMATION ONLY
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`
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`
`
`
`Codes used to identify States party to the PCT on the front pages of pamphlets publishing international
`
`
`
`applications under the PCT.
`
`Austria
`AT
`Australia
`AU
`Barbados
`BB
`Belgimn
`BE
`
`Burkina Faso
`BF
`BG Bulgaria
`BJ Benin
`Brazil
`BR
`Belarus
`BY
`Canada
`CA
`CF Central African Republic
`Congo
`CG
`CB Switzerland
`C61e d'Ivoire
`Cl
`CM Cameroon
`CN Olina
`cs Czechoslovakia
`Czech Republic
`CZ
`Germany
`DE
`DK Demnark
`F.S Spain
`FI
`Finland
`FR Prance
`Gabon
`GA
`
`United Kingdom
`MR Mauritania
`GB
`MW Malawi
`GE Georgia
`NE Niger
`Guine.tl
`GN
`NL Netherlands
`Greece
`GR
`BU Hungary
`NO Norway
`IE mland
`NZ New Zealand
`Poland
`IT Italy
`PL
`PT Ponugal
`JP Japan
`KE Kenya
`RO Romania
`Kyrgystan
`
`Russian Federation
`KG
`RU
`
`KP Demoaatic People's Republic SD Sudan
`SE Sweden
`ofK.oru
`SI Slovenia
`KR Republic of Korea
`Slovakia
`KZ Ka.t.akbstan
`SK
`SN Senegal
`TD Cbad
`TG Togo
`Tajikistan
`TJ
`Tr Trinidad and Tobago
`Ukraine
`UA
`United States of America
`us
`uz Uzbekistan
`VN Viet Nam
`
`Liechtenstein
`LI
`Sri Lanka
`LK
`LU Luxembourg
`Latvia
`LV
`Monaco
`MC
`MD Republic of Moldova
`Madagucar
`MG
`ML Mali
`MN Mongolia
`
`Ex.1041
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`WO 95/08900
`
`PCT/FI94/00413
`
`1
`
`A mobile communication system and a method for
`
`connecting a remote workstation to a data commun­
`
`ication network via a mobile communication network
`
`5
`
`The invention relates to a mobile communication
`
`system comprising a mobile data unit acting via a
`
`mobile communication network as a remote workstation
`
`in a data network; a mobile exchange; means for
`
`establishing a data connection between the mobile data
`
`10
`
`unit and the mobile exchange.
`
`Mobile communication systems have been developed
`
`as there has been a need to free people to leave their
`
`desktop telephone terminals and to reach them even
`
`when they are outside a specified location. As auto-
`
`15
`
`mation begins to be an integral part of the working
`
`environment, people outside off ices wish to operate
`
`computers everywhere and make connections from any one
`
`location to another. The development of mobile commun­
`
`ication systems offering voice services in the
`
`20
`
`direction of data services thus seems to be inevi t­
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`able.
`
`Computer technology makes it possible to produce
`
`lightweight truly portable devices with improved pro­
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`cessing power, storage capacity and user friendliness.
`
`25
`
`This evolution of computers has made it technically
`
`and economically feasible to offer mobile data ser­
`
`vices for moving people. In such a case, the user is
`
`most likely to possess a mobile telephone terminal for
`
`voice communication, so the best way to provide data
`
`30
`
`communication is through the mobile telephone system
`
`,..
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`in much the same way as conventional telephone lines
`
`are used for data communication by using modems.
`
`The entry of digital mobile communication
`
`systems, such as the Pan-European mobile radio system
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`35
`
`GSM, means a break-through when mobile data commun-
`
`Ex.1041
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`WO 95/08900
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`PCT/F194/00413
`
`2
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`
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`ication is to be supported in general-purpose cellular
`
`
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`
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`networks. As the GSM is fully digital and applies the
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`
`
`
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`general principles of ISDN (Integrated Services Data
`
`
`
`
`
`Network), it is inherently capable of carrying data.
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`
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`
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`5 From the data networking point of view, the GSM does
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`
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`not represent a dedicated data communication network
`
`
`
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`
`
`
`but an access network. In other words, data commun­
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`
`
`ication via the GSM is intended to provide access to
`
`actual data networks.
`
`10
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`
`
`The GSM network offers a wide range of services
`
`
`
`to subscribers. In addition to speech and emergency
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`
`
`
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`call services, the GSM network supports all variations
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`
`
`
`
`
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`of low-speed data communication services offered with�
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`
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`
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`in telecommunication today. The only restriction is
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`
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`15 set by the capacity of the radio interface, which
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`
`
`restricts the data rate to 9.6 kbit/s.
`
`
`
`It is thus also possible to use the GSM system
`
`
`
`to connect a remote workstation to a desired data
`
`
`
`
`
`communication network, such as a Local Area Network
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`
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`20 (LAN) . The remote workstation is usually a conven­
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`
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`tional workstation (PC) connected to the data inter­
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`
`
`£ ace of a mobile unit ( mobile phone) . The remote
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`
`
`terminal may thus transmit data via the radio path
`
`
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`
`
`with a data modem provided in association with the
`
`
`
`
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`25 mobile exchange and further by means of a modem
`
`
`
`connection e.g. through a public telephone network
`
`
`
`
`
`with a second data modem and a data terminal equipment
`
`
`
`connected to it. This second modem is usually attached
`
`
`
`to a computer connected to a LAN network. This com-
`
`
`
`
`
`30 puter is used for enabling
`remote access to the LAN
`
`It is usually called an Access Server. The
`network.
`
`..
`
`ports to
`access server has several data communication
`
`some kind of
`which modems and a software enabling
`
`
`
`
`
`remote access are connected. Correspondingly, the
`
`
`
`in order 35 remote workstation has to comprise a software
`
`
`
`
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`Ex.1041
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`WO 95/08900
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`PCT/F194/00413
`
`3
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`that it would be able to communicate with the access
`
`
`server software.
`
`However, the above-described way of connecting a
`
`
`
`
`
`remote workstation via a mobile communication system
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`5 to a data network has a few disadvantages. First, for
`
`instance, the GSM radio path enables a 9.6-kbit/s
`
`
`transmission rate and an excellent bit error rate of
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`
`
`
`
`
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`the order of 10-s. However, the connection is extended
`
`between the mobile communication network and the des-
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`
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`10 tination data network by means of a modem connection
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`switched
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`
`
`
`via a public telephone network. The maximum
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`transmission rate of this kind of modem connection is
`
`
`usually 2.4 kbit/s, and its bit error rate is of the
`order of about 10-4 to 10-5
`
`• The entire connection will
`
`15 thus have the same transmission rate and bit error
`
`rate values, which are clearly inferior to those the
`
`GSM network, for instance, is able to offer. Second,
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`
`
`the prior art method is not sufficiently efficient
`from the point of view of the radio path, as it is
`
`
`
`20 necessary to use a circuit-switched connection in the
`
`mobile communication network and keep the radio re­
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`
`sources allocated throughout the LAN session, even
`
`during silent periods when there is no kind of com­
`munication.
`
`25
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`
`
`The object of the invention is to connect a
`
`remote workstation via a mobile communication system
`
`
`to a data network in such a way that the problems
`
`
`mentioned above will be alleviated or avoided.
`This is achieved by a mobile communication
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`
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`system disclosed in the preamble, which according to
`
`
`the invention is characterized in that the arrangement
`
`30
`
`..
`
`further comprises an interconnecting computer attached
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`
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`to the mobile exchange, the interconnecting computer
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`
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`extending the connection and simulating the remote
`35 workstation towards said data network.
`
`
`Ex.1041
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`WO 95/08900
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`PCT/F194/00413
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`4
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`
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`Another aspect of the invention is a method for
`
`
`
`connecting a remote workstation via a mobile commun­
`
`
`
`
`
`ication network to a data network, the method compris­
`
`..
`
`
`
`ing starting a session from the remote workstation;
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`
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`5 establishing a data connection over the radio path in
`
`
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`the mobile communication network for the data session;
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`
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`and extending the connection between the mobile com­
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`
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`munication network and the data network. According to
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`the invention the method is characterized by tempor-
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`10 arily releasing said data connection in the mobile
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`communication network during the data session, and
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`
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`when the data connection has been released
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`
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`a)said extended connection is maintained to­
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`
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`wards the data network;
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`15
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`b)the operation of the remote workstation is
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`
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`simulated towards the data network at the end of the
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`extended connection on the side of the mobile com­
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`munication network; and
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`c)communication addressed from the data network
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`20 to the remote workstation is monitored, and, if re­
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`quired, a notification is transmitted to the remote
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`
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`workstation over the radio path by non-switched mess­
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`age transmission.
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`
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`The basic idea of the invention is to facilitate
`
`25 more flexible (more
`
`efficient from the view point of
`
`
`
`costs and radio resources) connectivity via the radio
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`
`
`
`
`path by using a special interconnecting computer in
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`
`
`association with the mobile exchange for extending
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`
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`
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`connections to the destination data network. This
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`
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`
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`30 interconnecting computer thus acts as a gateway be-
`
`
`
`tween a remote workstation using the mobile commun-..
`
`
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`ication network and its home data network; simulates
`
`
`
`the operation of the remote workstation towards the
`
`
`
`data network; and takes care of the actual remote
`
`
`
`35 workstation which resides behind the radio path. A
`
`
`
`Ex.1041
`APPLE INC. / Page 6 of 21
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`WO 95/08900
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`PCT/FI94/00413
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`5
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`
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`data connection established over the radio path can be
`
`
`
`..
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`
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`radio path is not needed for data communication, but
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`
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`disconnected so as to minimize the air time when the
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`the interconnecting computer keeps the extended con-
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`
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`5 nection active towards the data network. The inter­
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`connecting computer transmits the remote workstation a
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`notification by utilizing non-switched message trans­
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`mission when data communication with the data network
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`
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`is required, and so the remote workstation may start
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`10 re-establishment of the data connection on the radio
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`path. The remote workstation may also itself start the
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`re-establishment of the data connection if it wishes
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`to. The applications of the remote workstation see the
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`data communication link as active and so does the data
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`
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`15 network at the other end of the extended connection.
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`The invention thus allows a virtual connection to be
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`maintained throughout the session; on the other hand,
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`radio resources are allocated only when data commun­
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`ication is actually needed. In addition, the inter-
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`20 connecting computer is connected directly to a suit­
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`able LAN network or wide area network, so that modem
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`connections established through a conventional tele­
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`phone network are avoided while utilizing the full
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`
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`data transmission rate of the radio path and the high
`
`25 bit error rate.
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`
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`In the following the invention will be described
`
`
`
`in which
`with reference to the attached drawings,
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`
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`
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`Figure 1 illustrates a mobile communication
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`
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`network according to the invention and its connection
`
`
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`30
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`
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`to data networks, and
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`
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`Figure 2 is a more detailed block diagram of the
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`
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`connection of an exchange MSC shown in Figure 1 to an
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`
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`interconnecting computer 19.
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`
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`The present invention is suitable for use in all
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`
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`
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`
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`a 35 digital mobile communication systems for connecting
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`Ex.1041
`APPLE INC. / Page 7 of 21
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`WO95/08900
`
`PCT/F194/00413
`
`
`
`remote workstation to a data network. It can be
`
`6
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`
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`applied particularly advantageously in the Pan­
`
`
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`
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`European digital mobile communication system GSM and
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`other similar digital systems, such as DCS1800 and PCN
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`5 ( Personal Communication Network) . Al though the pre­
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`
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`ferred embodiment of the invention will be described
`
`
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`
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`below referring to an application in the GSM system,
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`
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`the invention its not limited to it.
`
`The ETSI GSM specifications and The GSM System
`
`10 Mobile Communications, by M. Moyly & M. B. Pautet,
`
`
`Palaiseau, France, ISBN: 2-9507190-0-7, are referred
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`
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`to for the more detailed structure and operation of
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`
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`the GSM system.
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`
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`Figure 1 schematically shows a part of a GSM
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`15 cellular radio system. In the cellular radio system,
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`
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`the area covered by the system is divided into radio
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`cells. Base station systems BSS (a single system is
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`
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`shown in the figure) are connected to a mobile ex­
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`
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`change MSC 10 by digital transmission links 4 ( a
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`
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`20 single link is shown in the figure). Each base
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`
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`stations system BSS comprises a base station con­
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`troller BSC ( not shown) , to which one or more base
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`
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`stations BTS ( not shown) are similarly connected by
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`digital transmission links. The radio coverage area of
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`25 one base station BTS typically forms one radio cell.
`
`Each base station BTSl to BTS4 has a predetermined
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`
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`number of physical radio channels. A GSM signal
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`
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`(physical channel) consists of TOMA frames each
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`
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`containing preferably eight time slots in which
`30 logical channels
`
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`are transferred. Logical channels
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`
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`contain traffic channels for calls ( voice and data)
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`established with mobile radio stations MS residing in
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`the cell, and control channels for signalling with
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`mobile radio stations MS ( mobile uni ts) residing in
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`35 the cell.
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`A speech connection, V .110-rated 64-kbi t/s
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`Ex.1041
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`WO 95/08900
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`PCT/F194/00413
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`7
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`
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`full-duplex data connection or 9.6/4.8/2.4 kbit/s data
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`connection
`
`can be established on the traffic channels.
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`
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`A special adapter is typically needed at both ends of
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`
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`the data connection for adapting the data connection
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`
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`5 to the terminal equipment
`and/or other communication
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`
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`lines/communication systems. The adapter associated
`
`with the mobile unit is usually called a terminal
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`adapter and the adapter at the network end a network
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`
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`termination IWF. In the GSM mobile radio network, this
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`
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`10 kind of network termination is located in conjunction
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`
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`with the mobile exchange MSC.
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`
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`For the sake of clarity, Figure 2 shows only a
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`
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`switching field 11 and call control of the mobile
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`exchange MSC 10; in this specific case, the call
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`15 control is a decentralized computer system comprising
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`computers 12, 13 and an interconnecting message bus
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`14.In practice, the MSC may contain a great number of
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`different devices. The switching field 11 may be an
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`analog or a digital switching means, which selectively
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`20 switches speech and data connections from the base
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`station system BSS between inbound transmission lines
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`4 and transmission lines 5 from the mobile exchange.
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`
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`As an example of such digital mobile exchanges, the DX
`
`200 MSC of Nokia can be mentioned.
`
`25
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`
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`A network termination unit 15 (IWF) is conn�cted
`
`
`
`in parallel with the switching field 11. One or more
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`
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`further network termination units may be similarly
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`
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`connected in parallel with the switching field 11. The
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`
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`network termination unit 15 comprises a transmission
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`
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`30
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`unit COCA 24 on the side of a port Pl. The COCA takes
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`
`
`
`
`care of functions required by the transmission con­
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`
`
`
`
`
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`nection between the exchange MSC and the base station
`
`
`
`BTS, such as multiplexing. In the specific case, the
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`
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`
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`
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`transmission connection is a 2-Mbi t/s PCM connection
`
`
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`35 on which 30 channels are transmitted. For each channel
`
`
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`Ex.1041
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`WO 95/08900
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`PCT/F194/00413
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`8
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`
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`there is provided a data communication service adapter
`
`
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`
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`DASA 17, to which the COCA 24 connects the channel and
`
`which provides matching between the GSM data con­
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`
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`nection and a V. 24 interface 18. For conventional
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`
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`modem connections to be established via a public
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`
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`switched telephone network PSTN, the network termin­
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`
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`ation unit 15 comprises a group 16 of three data
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`
`
`modems of different types. The control interface of
`
`
`
`the modem is connected to the V.24 interface 18, and
`
`
`
`
`
`10 its line or modem interface is connected to the
`
`
`
`
`
`switching field 11.
`
`In Figure 1, the remote workstation equipment
`
`comprises a mobile radio station 3 (MS) and a remote
`
`workstation 4 (e.g. a personal computer PC) attached
`
`15 to it. For data communication,
`the above-mentioned
`
`
`data connection from the remote workstation 3, 4 to
`
`
`
`
`the exchange MSC 10 is established by means of a radio
`
`link between the mobile radio station 3 (mobile tele­
`
`phone) and the base station system BSS on a logical
`
`20 traffic channel.
`
`Referring to Figure 2, the switching field 11
`
`
`n
`
`
`switches a data connection to the network terminatio
`
`
`
`unit 15 for conventional data communication by means
`
`
`
`
`
`of modems. In the network termination unit, one of the
`
`
`
`25 DASAs 17 adapts the data connection to the V.24 inter­
`
`face 18 and through it to the data modems 16. The line
`
`
`interface (modem interface) of the data modems 16 is
`
`
`
`connected to a conventional wired connection, which in
`
`
`
`
`
`
`
`this specific case is connected e.g. via the public
`
`
`
`
`
`30 switched telephone network PSTN to another data modem
`
`
`
`(not shown). The modems signal in a normal way over a
`
`
`
`modem connection established between them. The remote
`
`
`
`
`
`workstation 3, 4 in turn controls the operation of the
`
`
`
`
`
`
`data modem 16 via the GSM data connection and trans-
`data from the data modem 16,
`35 mits data to and receives
`
`Ex.1041
`APPLE INC. / Page 10 of 21
`
`

`

`WO 95/08900
`
`PCT/Fl94/00413
`
`respectively.
`
`9
`
`
`
`In the preferred embodiment of the invention
`
`
`
`
`
`
`
`shown in Figure 1, an interconnecting computer 19 is
`
`
`
`attached to the exchange
`
`
`MSC for connections to other
`
`
`
`5 data networks, such as LAN networks. This intercon­
`
`
`
`
`
`necting computer, which will be called the AGENT 19
`
`
`
`hereinbelow, establishes a bus between the remote
`
`
`
`
`
`workstation 4 and a desired LAN. The network termin­
`
`ation unit 15 has at least one of the DASAs 17
`
`
`
`10 dedicated to interfacing a 9. 6-kbi t/s GSM data
`
`
`
`
`
`connection to the V. 24 interface, which in turn is
`
`
`
`
`
`connected to the AGENT computer 19 . In other words,
`
`
`
`
`
`
`
`the AGENT computer 19 is connected to the MSC as a
`
`
`
`kind of PAD (Packet Assembly/Disassembly), for which
`
`
`
`
`
`
`
`
`15 the GSM recommendations define special interfacing. No
`
`kind of modems are needed.
`
`
`
`The AGENT computer 19 is preferably a commercial
`
`
`
`
`
`computer typically running an OS/2 2.x, Windows NT or
`
`
`
`of
`UNIX operating system. In the preferred embodiment
`
`
`
`
`
`
`
`
`
`20 the invention shown in Figure 1, the GSM operator has
`
`
`
`its own local LAN segment 20 dedicated to intercon­
`
`necting the MSC, the AGENT computer 19 and several
`
`customer LANs. The AGENT computer 19 is connected
`
`
`
`directly to this local LAN segment 20.
`
`25
`
`
`
`In the preferred embodiment of the invention,
`
`
`
`
`
`the protocol applied towards the public data network
`
`
`
`is TCP/IP (Transmission Control Protocol/Internet
`
`
`
`
`
`Protocol). In other words, the solution according to
`
`
`
`
`
`the invention offers the IP service for the remote
`
`
`
`
`
`30 workstations of the mobile communication network. The
`
`
`
`
`
`protocol between the remote workstation 4 and the
`
`AGENT computer 19 is the Virtual Channel Protocol
`
`
`
`(VCP) specified and developed by Nokia Inc. The VCP is
`
`
`
`
`
`below the IP layer. The remote workstation 4 has a
`
`35 dedicated
`
`
`GSM/IP address in addition to its possible
`
`Ex.1041
`APPLE INC. / Page 11 of 21
`
`

`

`WO95/08900
`
`PCT/Fl94/00413
`
`10
`
`
`
`home IP address. The GSM/IP address is assigned by the
`
`
`
`
`
`GSM/data network operator, and a router 21, which
`
`
`
`connects the customer's home LAN e.g. to a public
`
`
`
`network 22, is configured
`to process this
`Internet
`
`
`
`5 GSM/IP address. In addition, the mobile communication
`
`
`
`network has special GSM/ARP ( GSM specific Address
`
`
`
`
`
`Resolution Protocol) and GSM/RARP ( GSM specific Re­
`
`
`
`
`
`verse Address Resolution Protocol) protocols. The
`
`
`
`
`
`GSM/ARP is used to determine the GSM telephone number
`
`
`
`10 from the IP address, and the GSM/RARP
`is used to
`
`
`
`determine the IP address from the GSM telephone
`
`number.
`
`
`
`A remote workstation 4 that wishes to start a
`
`
`
`data session dials the telephone number reserved for
`
`
`
`
`
`
`15 the AGENT computer 19 and starts the establishment of
`
`
`
`a GSM data connection between the mobile unit MS 3 and
`
`
`
`the exchange MSC 10, and so the switching field 11
`
`
`
`
`
`routes the data call to the network termination unit
`
`
`
`
`
`15 to which the AGENT computer 19 is connected. The
`
`
`
`20 AGENT computer 19 comprises a database containing
`
`
`
`
`
`
`
`
`
`information about subscribers authorized to use the
`
`
`
`data services. The AGENT computer 19 checks the sub­
`
`
`
`
`
`scriber authorization and creates an Agent Process to
`
`
`
`serve this new connection. The AGENT computer 19 then
`
`
`
`
`
`
`
`25 extends the connection to a customer LAN 24 through a
`
`
`
`
`
`
`
`router 23. The AGENT computer 19 simulates the oper­
`
`
`
`
`
`ation of the remote workstation towards the customer
`
`con­
`LAN 24 located at the other end of the extended
`
`nection.
`
`30
`
`
`
`When the user of the remote workstation 4 wishes
`
`
`
`to free/release the radio connection, he/she informs
`
`
`
`
`
`the AGENT computer 19 that MS 3 and remote workstation
`
`4 will be in a manual release state from now on. The
`
`
`
`AGENT computer 19 maintains the extended connection
`
`
`
`
`
`
`
`35 and continues to act as a remote workstation towards
`
`
`
`Ex.1041
`APPLE INC. / Page 12 of 21
`
`

`

`WO 95/08900
`
`PCT/FI94/00413
`
`11
`
`
`
`the customer-LAN by monitoring communication addressed
`
`
`
`
`
`
`
`to the remote workstation 4. If there occurs something
`
`
`
`in the customer-LAN that concerns the remote work­
`
`..
`
`5
`
`
`
`19 informs the remote workstation 4 via the radio path
`
`
`
`station 4 (e.g. electronic mail), the AGENT computer
`
`
`
`
`
`by means of non-switched message transmission, such as
`
`the GSM short message service (SMS). The user thus has
`
`
`
`the responsibility to re-establish the GSM data con­
`
`
`
`
`
`nection to the AGENT computer 19 for certain measures
`
`
`
`10 (such as reading electronic mail).
`
`
`
`Another alternative is to use automatic release
`
`
`
`
`
`
`
`of a GSM data connection. The data communication soft­
`
`
`
`ware of the remote workstation 4 releases the connec­
`
`
`
`
`
`tion automatically when a sufficiently long break,
`
`
`
`
`
`
`
`15 i.e. a predetermined period of time, has occurred in
`
`
`
`
`
`the data communication. The duration of the break may
`
`
`
`be negotiated at the outset of each connection
`
`
`
`
`
`establishment. The AGENT computer 19 maintains the
`
`
`
`extended connection and continues to operate as a
`
`
`
`
`
`20 remote workstation towards the customer LAN 24. If the
`
`
`
`
`
`
`
`remote workstation 4 has data to be transmitted to­
`
`
`
`wards the customer LAN, the telecommunication software
`
`
`
`
`
`establishes a data connection to the AGENT computer
`
`
`
`
`
`19.If the customer LAN 24 has data to be transmitted
`
`
`
`25 to the remote workstation 4, the AGENT computer 19
`
`
`
`transmits a short message to the telecommunication
`
`
`
`software of the remote workstation 4, and the software
`
`
`
`
`
`then re-establishes the data connection. As the AGENT
`
`
`
`
`
`computer 19 is already operating, and the extended
`
`
`
`30 connection to the LAN 24 has already been set up, the
`
`
`
`establishment of the data connection to the AGENT
`
`
`
`
`
`computer 19 is all that is needed, and so the time
`
`
`
`required for re-establishing the connection is con­
`
`
`
`
`
`
`
`siderably shorter.
`
`35
`
`
`
`It is possible to omit the local LAN segment 20
`
`Ex.1041
`APPLE INC. / Page 13 of 21
`
`

`

`WO95/08900
`
`PCT/FI94/00413
`
`12
`
`
`
`
`
`the of the GSM operator shown in the figure, integrate
`
`
`
`AGENT computer 19 and the router 23, and connect this
`
`
`
`integrated unit directly to a telecommunication net-
`
`
`
`
`
`work 22.
`
`•
`
`5
`
`
`
`Also in other respects, the figures and the de-
`
`
`
`scription related to them are only intended to illus­
`
`
`
`
`
`trate the present invention. In its details the in­
`
`vention may vary within the spirit and scope of the
`
`
`
`attached claims.
`
`Ex.1041
`APPLE INC. / Page 14 of 21
`
`

`

`WO 95/08900
`
`PCT/FI94/00413
`
`13
`
`Claims:
`
`•
`
`a mobile data unit (3, 4) acting via a mobile
`
`
`
`1.Mobile communication system comprising
`
`
`
`
`
`in a 5 communication network as a remote workstation
`
`data network (24);
`
`
`
`a mobile exchange (10, 15);
`
`
`
`means for establishing a data connection between
`
`
`
`the mobile data unit ( 3, 4) and the mobile exchange
`10 (10, 15);
`
`c h a r a c t e r i z e d
`in that the arrangement
`
`
`
`further comprises an interconnecting computer ( 19 )
`
`
`
`
`
`attached to the mobile exchange (10, 15), the inter­
`
`
`
`
`
`connecting computer extending the connection and
`
`
`
`
`
`
`
`15 simulating the remote workstation (3, 4) towards said
`
`
`
`data network (24).
`
`
`
`
`
`2. Mobile communication system according to
`
`
`
`claim 1, c h a r a c t e r i z ed in that the mobile
`
`
`
`
`
`exchange ( 10, 15) establishes a data connection and
`
`
`
`20 routes it to the interconnecting computer ( 19) in
`
`
`
`response to a predetermined number of the inter­
`
`connecting computer dialled by the mobile data unit
`
`
`
`
`(3, 4).
`
`
`
`
`
`3. Mobile communication system according to
`
`
`
`25 claim 1 or 2, c h a r a c t e r i z e d in that the
`
`
`
`interconnecting computer ( 19) maintains the extended
`
`
`
`
`
`connection towards said data network when the data
`
`
`
`connection between the mobile data unit and the mobile
`
`
`
`
`
`exchange is released temporarily during the session.
`
`30
`
`
`
`
`
`4.Mobile communication system according to
`
`claim 1, c h a r a c t e r i z ed in that said data
`
`network (24) is a local area network (LAN), prefer�bly
`
`a TCP/IP network.
`
`
`
`
`
`5. Mobile communication system according to
`
`35 claim 1, c h a r a c t e r i z ed in that the system
`
`Ex.1041
`APPLE INC. / Page 15 of 21
`
`

`

`WO 95/08900
`
`PCT/Fl94/00413
`
`
`
`comprises a local area network ( 20), to which the
`
`14
`
`
`
`
`
`interconnecting computer (19) is connected.
`
`
`
`
`
`6.Method for connecting a remote workstation to
`
`
`
`
`
`a data network via a mobile communication network, the
`
`5
`
`method comprising
`
`•
`
`
`
`starting a session from the remote workstation;
`
`
`
`establishing a data connection over the radio
`
`
`
`
`
`path in the mobile communication network for the data
`
`session;
`
`10
`
`
`
`extending the connection between the mobile
`
`
`
`
`
`communication network and the data network;
`
`c h a r a c t e r i z e d by
`
`
`
`temporarily releasing said data connection in
`
`
`
`
`
`
`
`the mobile communication network during the data
`
`
`
`15 session, and when the data connection has been releas­
`
`
`
`ed
`
`
`
`a)said extended connection is maintained to­
`
`
`
`
`
`wards the data network;
`
`
`
`
`
`b)the operation of the remote workstation is
`
`
`
`20 simulated towards the data network at the end of the
`
`
`
`extended connection on the side of the mobile commun­
`
`
`
`ication network; and
`
`
`
`
`
`c)communication addressed from the data network
`
`
`
`to the remote workstation is moni tared, and, if re-
`
`
`
`25 quired, a notification is transmitted to the remote
`
`
`
`
`
`
`
`workstation over the radio path by non-switched mess­
`
`age transmission.
`
`
`
`
`
`7.Method according to claim 6, c h a r a c­
`
`t e r i z e d
`
`
`in that said data connection is re-
`
`
`
`network during 30 established in the mobile communication
`
`
`
`
`
`the session on the initiative of the remote work­
`
`station.
`
`
`
`8.Method according to claim 6 or 7, c h a r­
`
`a c t e r i z ed in that said release of the data
`
`
`
`35 connection is started manually by the user of the
`
`
`
`Ex.1041
`APPLE INC. / Page 16 of 21
`
`

`

`WO95/08900
`
`PCT/FI94/00413
`
`remote workstation.
`
`15
`
`
`
`9 . Method according to claim 6 or 7, c h a r­
`
`
`
`a c t e r i z e d in that said release of the data
`
`
`
`connection is started automatically after a pre­
`
`
`
`5
`
`
`
`determined period of time has elapsed from the last
`
`
`
`communication event on the data connection.
`
`
`
`10.Method according to claim 9, c h a r a
`c­
`
`
`
`t e r i z e d in that said predetermined period of
`
`
`
`
`
`time is negotiated at the outset of each data session.
`
`10
`
`11. Method according to claim
`
`6,
`
`
`
`c h a r a c t e r i z e d in that said non-switched
`
`
`
`message transmission is carried out as short-message
`
`transmission.
`
`Ex.1041
`APPLE INC. / Page 17 of 21
`
`

`

`WO95/08900
`
`PCT/FI94/00413
`
`1/2
`
`,i;:f"
`C\J
`
`LO
`C\J
`
`a:
`LU
`
`f­ ::::,
`
`
`0
`a:
`
`,-C\l
`
`
`
`r-----------
`1
`
`-LL
`
`Cl')
`C\l
`
`-0:�
`�
`5
`a:
`
`I
`
`I
`
`I
`
`I
`I c-----------,----- --c
`
`0
`C\l
`
`f-z
`
`
`C,
`
`LU
`
`<(
`
`IX)
`,-
`
`C) ,-
`
`�
`en
`en
`a:
`LO
`C\I LO
`0
`,- x ,-
`
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`• C\l
`
`0 LL
`Cl)
`�
`
`� : >
`
`L
`
`Cl)
`Cl)
`Cl'.l
`
`Ex.1041
`APPLE INC. / Page 18 of 21
`
`

`

`WO 95/08900
`
`PCT/FI94/00413
`
`2/2
`
`7
`
`I
`I
`I
`I
`I
`I
`I
`
`I I
`
`z
`
`I­C/)
`
`
`
`C")
`C\I
`
`a: 0 ::> I- lJJ a:
`
`<C (!J lJJ z I-
`
`0
`,-
`
`0
`C\I
`
`r _; _ - - - - - - - -
`- ,-----------
`LO
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`
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`
`-.::I"
`C\I
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`
`
`
`I
`I
`
`CJ)
`
`,­,-
`
`tu
`tu
`
`
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`I
`L ___________ J
`
`,.
`
`0
`CJ)
`
`-.::I"
`
`co
`, ,...
`I
`--------'
`L __ _
`I
`I
`
`CJ)
`CJ)
`co
`
`Ex.1041
`APPLE INC. / Page 19 of 21
`
`

`

`1
`INTERNATIONAL SEARCH REPORT
`
`
`
`
`
`
`
`International application No.
`
`
`
`A. CLASSIFICATION OF SUBJECT MATTER
`
`PCT/FI 94/00413
`
`
`
`According to Internation;J Patent Classification (IPC) or to both national classification and IPC
`
`IPC6: H04Q 7/22 H04L 12/28
`
`
`
`
`
`FIELDS SEARCHED
`a
`
`
`
`
`
`
`Minimum documentation searched (classification system followed by classification symbols)
`
`
`
`
`
`,,
`
`IPC6: H04Q, H04L
`
`
`
`
`
`
`
`
`
`
`Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched
`
`SE,DK,FI,NO classes as above
`
`
`
`
`
`
`
`Electronic data base consulted during the international search (name of data base and, where practicable, search terms used)
`
`C.DOCUMENTS CONSIDERED TO BE RELEVANT
`
`
`
`
`
`
`
`
`
`to claim No. Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant
`
`
`
`X EP, AZ, 0332825
`1-3,6,7,8,9
`(MOTOROLA,
`INC), 20 Sept 1989
`(20.09.89),
`column 3, line 55 -column 5, line 28;
`column 7, line 22 -column 9, line 32, figures
`1,4,
`6
`
`y
`
`A
`
`y
`
`4,5
`
`10, 11
`
`--
`
`4,5
`EP, Al, 0483547
`(INTERNATIONAL BUSINESS MACHINES
`
`CORPORATION) , 6 May 1992 (06.05.92),
`figure 4,
`abstract
`--
`--------
`
`
`urther
`
`of Box C. Ci] See patent family annex.
`documents are listed in the continuation
`
`
`
`"T" later document published after the iotematiooal filing date or priority
`• Special categories of cited documents:
`
`
`
`
`
`
`but c