(19) United States
`(12) Patent Application Publication (10) Pub. No.: US 2002/0102998A1
`Lin
`(43) Pub. Date:
`Aug. 1, 2002
`
`US 2002O102998A1
`
`(54) MOBILE DEVICE, AUXILIARY RENDERING
`DEVICE AND ARRANGEMENT
`(76) Inventor: Ming-Hung Lin, Taipei (TW)
`Correspondence Address:
`U.S. Phillips Corporation
`580 White Plains Road
`Tarrytown, NY 10591 (US)
`(21) Appl. No.:
`09/989,255
`(22) Filed:
`Nov. 20, 2001
`(30)
`Foreign Application Priority Data
`
`Nov. 21, 2000 (EP)........................................ OO2O41341
`
`Publication Classification
`
`(51) Int. Cl. .................................................... H04Q 7/20
`
`(52) U.S. C. . 455/466; 455/553; 455/557;
`455/566
`
`(57)
`ABSTRACT
`The invention relates to an arrangement (100) comprising a
`mobile device (110) and an auxiliary rendering device (120).
`The mobile device (110) receives content from a content
`server (101) via a transcoding proxy (104) and can render it
`by itself, or relay it to the auxiliary rendering device (120).
`The mobile device (110) adapts the primary communication
`Session to the capabilities of the auxiliary rendering device
`(120). Preferably the mobile device (110) receives an assis
`tance message comprising information on the capabilities of
`the auxiliary rendering device (120), and relays this to the
`transcoding proxy (104) So that the content can be
`transcoded to a format Suitable for the auxiliary rendering
`device (120). The mobile device (110) can perform a han
`dover to a second auxiliary rendering device (121) if nec
`eSSary.
`
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`Patent Application Publication
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`US 2002/0102998 A1
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`MOBILE DEVICE, AUXILIARY RENDERING
`DEVICE AND ARRANGEMENT
`0001. The invention relates to a mobile device compris
`ing primary communication means for establishing a pri
`mary communication Session via a transcoding proxy with a
`content Server, and auxiliary communication means for
`establishing an auxiliary communication Session with an
`auxiliary rendering device.
`0002 The invention further relates to an auxiliary ren
`dering device comprising mobile device communication
`means for establishing an auxiliary communication Session
`with a mobile device, and rendering means for rendering
`content received in the auxiliary communication Session.
`0003. The invention further relates to an arrangement
`comprising Such a mobile device and Such an auxiliary
`rendering device.
`0004. A mobile device according to the preamble is
`known from U.S. Pat. No. 5,880,732. Mobile devices allow
`users to access information from a variety of Sources at any
`time and at any place. Such devices, for example mobile
`phones using the WireleSS Application Protocol, or palmtop
`computers, typically only have limited processing power
`and rendering capabilities. Due to portability considerations,
`the mobile device is typically made as thin as possible, i.e.
`low power consumption, compact, lightweight, and So on.
`Thus it is not possible to include many features in this thin
`device, e.g. high-resolution image, or requiring a specific
`plug-in program. To facilitate access to the rich content
`offered by various information Services, a content transcod
`ing proceSS needs to be executed automatically on an
`intermediate transcoding proxy when the intended content
`contains Something beyond the capability of the mobile
`device. The transcoding proxy server converts various types
`of contents into formats that are acceptable for a specific
`mobile device. This transcoding proceSS typically involves
`actions Such as adjusting the presentation So it will fit on the
`Small Screen on the mobile device, removing unnecessary
`elements Such as audio for devices that have no Sound
`capabilities, Scaling graphics to an appropriate size, com
`pressing data for transmission to the mobile device, con
`verting from e.g. HTML to WML, and so on.
`0005. A benefit of using this architecture is the simplifi
`cation of client devices and the ability of browsing universal
`content on the World-Wide Web. Most of the complicated
`tasks have been put on the transcoding proxy server or even
`further pushed to the content server. Meanwhile, another
`advantage of using this technology is the automatic content
`adaptation to various client devices and acceSS network
`bandwidth.
`0006. However, the trend of developing mobile thin
`clients is to design Smaller hand-held units. The Small size
`of mobile thin client causes an associated display or Speaker
`to be rather Small. The Small display or Speaker make it
`difficult to adequately present the content to a user. To Solve
`this problem, the above-mentioned U.S. patent discloses an
`arrangement that enables the usage of an external display
`monitor with a mobile telephone. The mobile telephone
`transmits numeric and textual data intended to be displayed
`on a display to a remote display monitor, where it can be
`presented on the large Screen of the remote display monitor.
`However, a disadvantage of this mobile device is that it only
`
`copies the same data to a large display monitor. This makes
`this mobile device less than optimal for use in the presen
`tation of data other than text. The data has been transcoded
`at the transcoding proxy to a format Suitable for the mobile
`device, and this format is inherently limited to the capabili
`ties of the mobile device. So, for instance, an image would
`be converted to black and white on a mobile device having
`only a black/white screen. This black and white image will
`then be transmitted by the mobile device for display on the
`remote display monitor. However, the remote display moni
`tor will most likely have a color display. A similar problem
`exists with audio data, which is transcoded for presentation
`by the mobile device, yet presented by a device with more
`capabilities than the mobile device.
`0007. It is an object of the invention to provide a mobile
`device according to the preamble, which can facilitate a
`better presentation of content than the known device.
`0008. This object is achieved according to the invention
`in a mobile device which is characterized by means for
`adapting the primary communication Session to the capa
`bilities of the auxiliary rendering device. When the primary
`communication Session is adapted in this fashion, the con
`tent received from the content server will be transcoded by
`the transcoding proxy for presentation on the auxiliary
`rendering device. The mobile device can to this end com
`municate information on the capabilities of the auxiliary
`rendering device to the transcoding proxy. Alternatively, the
`mobile device can comprise a number of profiles for auxil
`iary rendering devices, Select the most appropriate one and
`transmit that to the transcoding proxy. The transcoding
`proxy could also contact the auxiliary rendering device itself
`to learn about its capabilities, either via the mobile device or
`Via Some other communication channel. In any case, once
`the transcoding proxy knows the capabilities of the auxiliary
`rendering device, it can transcode content for presentation
`on the auxiliary rendering device rather than for presentation
`on the mobile device. This allows a greater choice in devices
`on which to render the content and the formats in which this
`should be done.
`0009. An embodiment is characterized by rendering
`means for rendering content received in the primary com
`munication Session, and rendering control means for exam
`ining the content and redirecting the content to one of the
`rendering means and the auxiliary communication means in
`dependence on the examination, whereby the auxiliary com
`munication means are arranged for transmitting the content
`via the auxiliary communication Session for rendering by the
`auxiliary rendering device. The transcoding proxy can, in
`accordance with the information on the capabilities of the
`auxiliary rendering device, transcode the content in the most
`appropriate fashion. If an auxiliary communication Session
`has been established with an auxiliary rendering device that
`comprises a color display, and the mobile device comprises
`a black and white display, the transcoding proxy may choose
`to transcode a Source image to a color image rather than a
`black and white image, and then transmit the transcoded
`image to the mobile device. The rendering control means in
`the mobile device will examine the received image, deter
`mine that it is a color image and relay it to the auxiliary
`rendering device. This facilitates an optimal presentation of
`the image.
`0010) A further embodiment is characterized in that the
`auxiliary communication means are arranged for receiving
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`an assistance message from the auxiliary rendering device,
`the assistance message comprising information on the capa
`bilities of the auxiliary rendering device, and for establish
`ing the auxiliary communication Session in response to the
`assistance message, and the primary communication means
`are arranged for transmitting Said information on the capa
`bilities to the transcoding proxy. The mobile device locates
`an auxiliary rendering device by means of the assistance
`message. This message comprises information on its capa
`bilities, Such as the presence of a display Screen with
`resolution data, the capabilities of a speaker, and So on. The
`mobile device relays this information to the transcoding
`proxy, which can then transcode the information into a
`format Suitable for rendering on the auxiliary rendering
`device or into a format Suitable for rendering on the mobile
`device.
`0.011) A further embodiment is characterized in that the
`auxiliary communication means are arranged for transmit
`ting an assistance request to at least one auxiliary rendering
`device. An advantage of this embodiment is that this allows
`the mobile device to actively locate an auxiliary rendering
`device. Auxiliary rendering devices can respond to the
`assistance request with their respective assistance messages,
`allowing the mobile device to Select the most appropriate
`one. The assistance request is preferably broadcast in a
`wireless fashion So that all auxiliary rendering devices in the
`vicinity can receive it.
`0012. A variant of this embodiment is characterized in
`that the primary communication means are arranged for
`receiving a communication request for establishing the
`primary communication Session, and the auxiliary commu
`nication means are arranged for transmitting the assistance
`request in response to receiving the communication request.
`An advantage of this variant is that it facilitates Server
`initiated communication Sessions. The content Server can
`Send a communication request, typically via the transcoding
`proxy, to the mobile device to establish a communication
`Session. The mobile device can then locate an auxiliary
`rendering device for use in that communication Session.
`0013 A further variant of this embodiment is character
`ized in that the auxiliary communication means are arranged
`for transmitting the assistance request when a level for the
`quality of a previously established auxiliary communication
`session drops below a predetermined value. The mobile
`device can also use the assistance request to locate a new
`auxiliary rendering device. This allows it to establish an
`auxiliary communication Session with the new auxiliary
`rendering device, for instance if the auxiliary rendering
`device that was previously in use has gone out of range.
`0.014) A further embodiment is characterized in that the
`auxiliary communication means are arranged for ending the
`auxiliary communication Session and establishing a further
`auxiliary communication Session in response to receiving a
`further assistance message from a further auxiliary rendering
`device, Said further assistance message comprising informa
`tion on the capabilities of the further auxiliary rendering
`device, and in that the primary communication means are
`arranged for transmitting Said information on the capabilities
`to the transcoding proxy in response to receiving the further
`assistance message. When the mobile device receives Such
`a further assistance message, for instance in response to
`transmitting an assistance request when the level of the
`
`previously established auxiliary communication Session
`drops below a predetermined value, it can Start using the
`new auxiliary rendering device instead. This makes it pos
`Sible for a user to walk around between multiple auxiliary
`rendering devices, for example display Screens in a building,
`without having to wait until the primary communication
`session has ended. The effect will be that the rendering of the
`content simply continues on the auxiliary rendering device
`he is closest to.
`0015. It is a further object of the invention to provide an
`auxiliary rendering device according to the preamble, which
`can a better presentation of content than the known device.
`0016. This object is achieved according to the invention
`in an auxiliary rendering device which is characterized in
`that mobile device communication means are arranged for
`transmitting an assistance message comprising information
`on the capabilities of the auxiliary rendering device to the
`mobile device. By transmitting the assistance message, the
`auxiliary rendering device allows the mobile device to
`determine whether it can make use of the offered facilities,
`Such as a larger display or better loudspeakers. The mobile
`device can then pass on this information to a transcoding
`proxy, which can then transcode content according to the
`capabilities of the auxiliary rendering device, rather than
`according to the capabilities of the mobile device.
`0017. An embodiment is characterized in that the mobile
`device communication means are arranged for transmitting
`the assistance message in response to receiving an assistance
`request from the mobile device. An advantage of this
`embodiment is that this allows the mobile device to actively
`locate an auxiliary rendering device. Auxiliary rendering
`devices can respond to the assistance request with their
`respective assistance messages, allowing the mobile device
`to Select the most appropriate one. The assistance request is
`preferably received from a broadcast in a wireleSS fashion.
`0018. The invention further relates to an arrangement
`comprising a mobile device and an auxiliary rendering
`device according to the invention.
`0019. These and other aspects of the invention will be
`apparent from and elucidated with reference to the embodi
`ments shown in the drawings, in which:
`0020 FIG. 1 schematically shows a communication net
`work arranged for a communication Session between a
`mobile device and a content Server;
`0021
`FIG. 2 schematically shows the mobile device in
`more detail; and
`0022 FIG. 3 schematically shows a handover process.
`0023 Throughout the figures, same reference numerals
`indicate Similar or corresponding features. Some of the
`features indicated in the drawings are typically implemented
`in Software, and as Such represent Software entities, Such as
`Software modules or objects.
`0024 FIG. 1 schematically shows a communication net
`work 100 arranged for a communication session between a
`mobile device 110 and a content server 101. The content
`servers 101, 102, 103 can establish communication sessions
`with mobile devices 110, 111, 112, 113 via a transcoding
`proxy 104. Also present are auxiliary rendering devices 120,
`121, comprising auxiliary loudspeaker and display, respec
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`tively. Other auxiliary rendering devices can of course easily
`be substituted. To illustrate the working of the invention, it
`is assumed that a communication Session is to be established
`between the mobile device 110 and the content server 101.
`0.025 The communication session is typically an end-to
`end communication Session that may involve the exchange
`of Internet data packets. They can be divided into two types
`as follows:
`0026 1. Client-initiated access, which may trigger
`the execution of Some application programs on the
`transcoding proxy, Such as image transcoding, audio/
`video re-encoding, JAVA or WML script execution,
`and So on.
`0027 2. Network-initiated services, such as e-mail
`notification, Internet telephony, instant messaging,
`and So on.
`0028. The transcoding proxy 104 transcodes communi
`cation sessions established between the content server 101
`and the mobile device 110 to and from a format Suitable for
`the mobile device 110, to facilitate access to the content
`offered by the content server 101. The transcoding proxy
`104 converts various types of contents into formats that are
`acceptable for the mobile device 104. This conversion
`typically involves actions Such as adjusting the presentation
`So it will fit on the Small screen on the mobile device 110,
`removing unnecessary elements Such as audio for devices
`that have no Sound capabilities, Scaling graphics to an
`appropriate size, compressing data for transmission to the
`mobile device 104, converting from e.g. HTML to WML,
`and So on. Methods of transcoding communication Sessions
`are known from e.g. U.S. Pat. No. 6,049,821 or U.S. Pat. No.
`5,918,013. The transcoding proxy 104 may directly relay the
`transcoded content to the mobile device 110, or may need a
`gateway 105 to do so.
`0029 FIG. 2 schematically shows the mobile device 110
`in more detail. It comprises a primary communication mod
`ule 201 for establishing a primary communication Session
`via a transcoding proxy with a content Server, and an
`auxiliary communication module 202 for establishing an
`auxiliary communication Session with an auxiliary rendering
`device Such as auxiliary rendering device 120.
`0030 The auxiliary communication module 202 receives
`an assistance message from the auxiliary rendering device
`120. This assistance message comprises information on the
`capabilities of the auxiliary rendering device 120, Such as
`the presence of a display Screen with resolution data, the
`capabilities of a speaker, and So on.
`0031. The assistance message may be sent by the auxil
`iary rendering device 120 of its own accord, but preferably
`is Sent in response to the transmission of an assistance
`request by the auxiliary communication module 202 to at
`least one auxiliary rendering device 120, 121. Auxiliary
`rendering devices 120, 121 can respond to the assistance
`request with their respective assistance messages, allowing
`the mobile device 110 to select the most appropriate one.
`The assistance request is preferably Sent as a broadcast in a
`wireless fashion. The mobile device 110 may employ a timer
`which is Set when the assistance request is transmitted. If the
`timer reaches a particular timeout value, and no assistance
`message has been received yet, the mobile device 110 can
`conclude no auxiliary rendering device 120 is available.
`
`In response to receiving the assistance message, the
`0032.
`auxiliary communication module 202 establishes an auxil
`iary communication Session with the auxiliary rendering
`device 120. This auxiliary communication session allows
`the mobile device 110 to relay the content via the auxiliary
`communication Session to the auxiliary rendering device 120
`for rendering by the auxiliary rendering device 120.
`0033. After the assistance message has been received, the
`primary communication module 201 transmits the informa
`tion on the capabilities to the transcoding proxy 104, which
`can then transcode the information into a format Suitable for
`rendering on the auxiliary rendering device 120 or into a
`format suitable for rendering on the mobile device 110.
`0034. The primary communication module 201 can now
`establish a primary communication Session with the content
`server 101. The auxiliary rendering device 120 can render
`content received in this Session. The primary communica
`tion Session can also be established in a Server-initiated
`fashion. In that case, the primary communication module
`201 receives a communication request for establishing the
`primary communication Session from the content Server 101.
`In response to that, the auxiliary communication module 202
`transmits the assistance request to locate an appropriate
`auxiliary rendering device, if no auxiliary communication
`Session has yet been established. Once the auxiliary com
`munication Session has been established, the primary com
`munication module 201 relays the information on the capa
`bilities of the auxiliary rendering device 120 to the
`transcoding proxy 104, and the primary communication
`session is established as above. The use of the timer as
`described above is particularly useful in this case, Since the
`content server 101 may employ its own timer in waiting for
`the primary communication Session to be established. If the
`mobile device 110 does not establish this session soon
`enough, the content server 101 will most likely give up. The
`attempt to establish an auxiliary communication Session
`should therefore not
`0035) The mobile device 110 further comprises a render
`ing module 203 which renders content received in the
`primary communication Session. Rendering the content can
`be done in a variety of ways, for example by presenting it on
`a display, producing a Sound using a loudspeaker, and So on.
`The rendering module 203 may employ a decoding module
`204, which decodes the received content before it can be
`rendered. This could be, for instance, an MP3 decoder, or a
`conditional acceSS module.
`0036). In accordance with the invention, the mobile
`device 110 further comprises a rendering control module
`205 which examines the received content to determine if it
`can be rendered by the rendering module 203. If this is the
`case, it redirects the content to the rendering module 203. If
`not, it redirects the content to the auxiliary communication
`module 202. The auxiliary communication module 202 then
`transmits the content via the auxiliary communication SeS
`sion to the auxiliary rendering device 120 for rendering by
`the auxiliary rendering device 120.
`0037. The auxiliary rendering device 120 comprises a
`mobile device communication module 210 for establishing
`an auxiliary communication Session with the mobile device
`110. The mobile device communication module 210 trans
`mits an assistance message comprising information on the
`capabilities of the auxiliary rendering device 120 to the
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`mobile device 110, preferably in response to receiving an
`assistance request from the mobile device 110. It may also
`be transmitted periodically or because of Some other factor.
`The mobile device 110 responds to receiving an assistance
`message by establishing the auxiliary communication SeS
`Sion, if it judges the capabilities of the auxiliary rendering
`device 120 sufficient. If not, it needs not do anything. The
`auxiliary rendering device 120 should therefore not take any
`action if no results are forthcoming from the assistance
`meSSage.
`0.038
`If the mobile device 104 receives multiple assis
`tance messages, it can pick one depending on Various
`factors. For instance, it may choose the assistance message
`from the geographically closest auxiliary rendering device,
`or the one that was received the Soonest after transmitting
`the assistance request.
`0039. The auxiliary rendering device 120 further com
`prises a rendering module 211 for rendering content received
`in the auxiliary communication Session. This rendering
`module 211 will typically have better rendering capabilities
`than the rendering module 203 in the mobile device 110.
`Once the mobile device 110 has established a primary
`communication Session with the content Server 101, it can
`relay content received therethrough via the auxiliary com
`munication Session to the auxiliary rendering device 120 for
`rendering by the auxiliary rendering device 120. The aux
`iliary rendering device 120 in FIG. 2 is equipped with a
`loudspeaker, and So allows rendering of audio content, Such
`as music or speech. This way, the mobile device 110 does not
`need to render this audio content on its own loudspeaker,
`which in the case of a mobile telephone gives a much lower
`rendering quality compared to a dedicated loudspeaker
`system. The mobile device 110 could similarly have used
`auxiliary rendering device 121, which comprises an auxil
`iary display that is bigger and has better resolution and color
`capabilities than the display on the mobile device 110. The
`mobile device 110 can now let the auxiliary rendering device
`121 render Visual content, Such as images, text or movies,
`rather than render it itself on its own tiny display. Once the
`primary communication Session has been ended, the mobile
`device 104 can Similarly end the auxiliary communication
`Session, Since it no longer needs to use the auxiliary ren
`dering device 120.
`0040 FIG. 3 schematically shows a handover process
`involving the mobile device 110 and first and second aux
`iliary rendering devices 120, 121. It is assumed that a
`primary communication Session has been established
`between content server 101 and mobile device 110 via
`transcoding proxy 104, and that an auxiliary communication
`session has been established between mobile device 104 and
`first auxiliary rendering device 120. AS has become clear
`above, the mobile device 104 receives content from the
`content server 101 and either renders this itself, using
`rendering module 203, or forwards the content to auxiliary
`device 120 via the auxiliary communication Session.
`0041. It may become necessary or desirable to stop using
`first auxiliary device 120 and to Start using Second auxiliary
`device 121 instead. For instance, the Second auxiliary device
`121 may have better rendering capabilities than the first
`auxiliary device 120, So Switching to Second auxiliary
`device 121 would be preferable for the user. Alternatively, a
`level for the quality of the established auxiliary communi
`
`cation Session drops below a predetermined value, i.e., the
`auxiliary device 120 goes out of range or Stops responding
`to transmissions for Some reason. The mobile device 110 can
`detect this, for instance, by performing an RF level Scan.
`0042. To Switch to second auxiliary device 121, the
`mobile device 110 transmits an assistance request, as
`described above. Second auxiliary rendering device 121 will
`receive the assistance request, and will respond with an
`assistance message, comprising information on its capabili
`ties. The mobile device 110 can use this message to deter
`mine if Switching to the Second auxiliary rendering device
`121 is desirable. If So, the auxiliary communication module
`202 ends the auxiliary communication session with the first
`auxiliary rendering device 120 and establishes a new aux
`iliary communication Session with the Second auxiliary
`rendering device 121. The primary communication module
`201 then transmits said information on the capabilities to the
`transcoding proxy 104, so that the transcoding proxy 104
`can Start transcoding to a format Suitable for the Second
`auxiliary rendering device 121.
`0043. It may be useful to temporarily suspend the pri
`mary communication Session before ending the auxiliary
`communication Session, and to resume the primary commu
`nication Session once the new auxiliary communication
`Session has been established. This ensures that no content is
`transmitted while no Suitable auxiliary rendering device is
`available.
`0044) The mobile device 110 will move around in the
`network. It may happen that it reaches the boundary of a
`So-called Service area covering a particular geographical
`area or portion of the network. In that case, the mobile
`device 110 needs to perform a handover to an adjacent
`service area. European patent application 00203656.4 (attor
`ney docket PHTWO0006) describes a method of transferring
`the primary communication Session from one Service area to
`another, and is incorporated herein by reference. Each
`Service area is associated with a transcoding proxy for
`transcoding communication Sessions established in Said Ser
`vice area to and from a format Suitable for the mobile device
`110. When the mobile device 110 moves to the Second
`Service area, the associated Second transcoding proxy is
`contacted and Session handling and Session information is
`transferred thereto. The transfer operation is transparent to
`the content server 101, so the session between mobile device
`110 and content server 101 stays intact.
`0045. When the mobile device 110 detects a boundary of
`the Service area, but there is no need to Start using the Second
`auxiliary rendering device 121, the above-mentioned
`method can be used without modification. It may be neces
`sary for the mobile device 110 to send the information on the
`capabilities of the first auxiliary rendering device 120 to the
`Second transcoding proxy associated with the Second Service
`area, if the Session information that is transferred does not
`include this information on the capabilities.
`0046. It can be advantageous to simultaneously switch
`from one Service area to another and from one auxiliary
`rendering device to another. In that case, the mobile device
`104 should send the information on the capabilities of the
`Second auxiliary rendering device 120 to the Second Service
`area during the handover process.
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`1. A mobile device (110) comprising primary communi
`cation means (201) for establishing a primary communica
`tion Session via a transcoding proxy (104) with a content
`server (101), and auxiliary communication means (202) for
`establishing an auxiliary communication Session with an
`auxiliary rendering device (120), characterized by means for
`adapting the primary communication Session to the capa
`bilities of the auxiliary rendering device (120).
`2. A mobile device (110) as claimed in claim 1, charac
`terized by rendering means (203) for rendering content
`received in the primary communication Session, and render
`ing control means (205) for examining the content and
`redirecting the content to one of the rendering means (203)
`and the auxiliary communication means (202) in depen
`dence on the examination, whereby the auxiliary commu
`nication means (202) are arranged for transmitting the
`content via the auxiliary communication Session for render
`ing by the auxiliary rendering device (120).
`3. A mobile device (110) as claimed in claim 1, charac
`terized in that the auxiliary communication means (202) are
`arranged for receiving an assistance message from the
`auxiliary rendering device (120), the assistance message
`comprising information on the capabilities of the auxiliary
`rendering device (120), and for establishing the auxiliary
`communication Session in response to the assistance mes
`Sage, and the primary communication means (201) are
`arranged for transmitting Said information on the capabilities
`to the transcoding proxy (104).
`4. A mobile device (110) as claimed in claim 3, charac
`terized in that the auxiliary communication means (202) are
`arranged for transmitting an assistance request to at least one
`auxiliary rendering device (120).
`5. A mobile device (110) as claimed in claim 4, charac
`terized in that the primary communication means (201) are
`arranged for receiving a communication request for estab
`lishing the primary communication Session, and the auxil
`iary communication means (202) are arranged for transmit
`ting the assistance request in response to receiving the
`communication request.
`
`6. A mobile device (110) as claimed in claim 4, charac
`terized in that the auxiliary communication means (202) are
`arranged for transmitting the assistance request when a level
`for the quality of a previously established auxiliary com
`munication Session drops below a predetermined value.
`7. A mobile device (110) as claimed in claim 3, charac
`terized in that the auxiliary communication means (202) are
`arranged for ending the auxiliary communication Session
`and establishing a further auxiliary communication Session
`in resp