Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
  • H04L9/40—Network security protocols
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
  • H04L65/1066—Session management
  • H04L65/1101—Session protocols
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
  • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
  • H04L65/60—Network streaming of media packets
  • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio

Definitions

• Memory management method in a client terminal, signal, computer program and corresponding terminal Memory management method in a client terminal, signal, computer program and corresponding terminal.
• the field of the invention is that of the reproduction of multimedia content on a radiocommunication terminal, for example of the radiotelephone type, PDA (in English “Personal Digital Assistant", in French “personal digital assistant”), laptop, etc.
• the invention is based on memory management in such a terminal and the simultaneous reproduction of multimedia content in continuous charging mode, also called "streaming" mode, or in progressive loading mode, in which the consumption of content by the terminal starts before the end of the download of this content.
• Multimedia content includes a set consisting of at least one animated graphic scene, also called multimedia scene, and a series of commands to change this scene from one state to another.
• a multimedia scene corresponds in particular to the arrangement of a set of graphic objects in time and in space, with which the user of the radiocommunication terminal can interact.
• the invention finds applications in all fields requiring a representation of the signals in the form of a spatio-temporal arrangement of graphic objects, with interactivity, and in particular to the domains enabling the client to consume the multimedia scenes in streaming mode, or progressive .
• a first technique applies to transmissions using the protocol HTTP ("Hyper Text Transport Protocol").
• HTTP Hyper Text Transport Protocol
• This communication protocol provides a parameter, at the level of the transport layer, indicating that the transported content must be stored in the communication terminal, called “cache memory”. This setting tells the client terminal that it should keep the cached content for a certain amount of time.
• a disadvantage of this technique is that the cache storage indication parameter applies to the entire transported content, which is not always necessary, and can lead to unnecessary cache congestion at the expense of data transmitted later. Moreover, this technique also does not allow the terminal to memorize a cache content, while simultaneously rendering it, in streaming mode for example.
• Another known technique is the insertion in a multimedia scene of another multimedia scene intended to be cached in the radiocommunications terminal. This technique makes it possible to meet the needs of advance transmission of multimedia scenes, intended to be stored for later playback.
• a disadvantage of this technique is again to require the caching, again, of all the content transmitted.
• Another disadvantage of this technique is that rendering multimedia content as a sub-scene inserted into a main scene is much more expensive in terms of resources than that of the same content organized as a single scene.
• the invention particularly aims to overcome these disadvantages of the prior art.
• an objective of the invention is to provide a technique enabling a client terminal to manage the cache memory, in particular to allow the memorization of a part of a multimedia content only.
• the invention also aims to enable this memory management while maintaining the restitution mode of continuous or progressive loading of this content.
• Another object of the invention is to provide such a technique allowing a precise configuration of the memory management in the client terminal, in particular in terms of delimiting the elements of the multimedia content intended to be memorized. in the terminal.
• the invention aims to provide such a technique having better performance in terms of memory management in the terminal of a portion of a multimedia content and simultaneous reproduction of this content in continuous or progressive loading mode.
• the invention proposes a new solution that does not have all of these disadvantages of the prior art, in the form of a memory management method in a mobile communication terminal able to process information representative of a scene.
• such a method comprises the following steps, implemented simultaneously: a step of restoring said scene in continuous loading mode or progressive on said terminal; a step of memorizing a portion of said multimedia content representative of said multimedia scene, said portion being pre-identified in said multimedia content.
• the method according to the invention makes it possible to restore a multimedia scene, in continuous or progressive loading mode, while memorizing pre-identified portions of this scene, in order to be able to restore them later, without making requests to an external server. , but only by retrieving them in the local memory of the terminal.
• the storage is selective, since only one (or more) part of the content is stored. This operation is carried out simultaneously with the restitution of the scene, without disturbance for it.
• the storage step is associated with a step of managing a table assigning to an address remote from said portion, in a server, a local address in said memory of said terminal, so that a call to said remote address is systematically transformed into a call to said local address.
• the terminal implements a correspondence between a remote address, corresponding for example to the access address on a server to the portion of the scene to be stored, and an address in the terminal's local memory.
• this call to the remote address is in fact transformed into a call to the local address corresponding to the location in memory of the terminal of the portion previously stored (if, of course, this portion has already been transmitted and memorized).
• the step of storing a pre-identified portion of said multimedia content is implemented according to at least one storage indicator.
• said storage indicator is associated with a configuration area of the description file of said multimedia scene and is defined by information according to which a pre-identified portion of said multimedia content representative of said scene must be stored in said memory of said terminal. customer or not.
• This configuration area of the scene description file can be anywhere in the file. It can be for example a file header.
• this storage indicator allows the determination of the portion of the scene to be memorized, and the terminal, when it recognizes it, knows that it must memorize a portion of the scene, simultaneously with the restitution of the scene.
• the configuration area of the description file of said multimedia scene further comprises at least one parameter defining a maximum duration of storage of said portion of said multimedia content in the memory of said client terminal.
• the configuration area of the description file of said multimedia scene further defines at least one of the parameters belonging to the group comprising: an address remote from said portion of said multimedia content stored in said memory of said client terminal; an information according to which said portion of said multimedia content must be stored in said memory of said client terminal, beyond a user session.
• the configuration zone of the description file also makes it possible to give indications to the terminal concerning the portion to be memorized, specifying the address at which the portion is accessible (for example on a server remote).
• a parameter of this configuration area may indicate to the terminal if the portion to be memorized must be beyond the user session, for example in the case where the portion of the scene is reusable in d ' other multimedia scenes, the rendering of which may be required in another user session.
• said storage indicator forms a means of discriminating between at least a portion of said multimedia content of said multimedia scene to be stored in said memory of said client terminal and at least one other portion not having to be .
• the memory indicator makes it possible to memorize only one portion, or several portions of a multimedia scene, while other portions are not.
• the terminal knows which portion of the scene should be memorized and which portion should not be memorized.
• said at least one storage indicator is in the form of a temporal signal determining that the portion of said multimedia scene received before said signal must be memorized while the portion of said multimedia scene received after said signal must be not be memorized. The terminal knows that from the detection of this time indicator it must no longer memorize the rest of the scene.
• Another aspect of the invention relates to a computer program product downloadable from a communication network and / or stored on a computer readable medium and / or executable by a microprocessor, including program code instructions for implementation. the memory management method of a client terminal as described above.
• Another aspect of the invention relates to a signal representative of a multimedia scene in the form of a multimedia content comprising a set of multimedia elements, transmitted in continuous loading mode between at least one multimedia scene server terminal and at least one client terminal on which said scene is restored.
• a signal comprises at least one indicator for storing in said client terminal a portion of said multimedia content representative of said multimedia scene, said indicator being directly interpretable by the memory management method in a terminal.
• a radiocommunication terminal comprising means for receiving a multimedia scene in the form of a multimedia content comprising multimedia elements.
• a terminal notably comprises the following means, implemented simultaneously: means for rendering said scene in continuous loading mode on said terminal, means for storing a portion of said multimedia content representative of said multimedia scene, said portion being pre-identified in said multimedia content.
• FIG. 1 illustrates an exemplary memory management method implemented in a client terminal according to a particular embodiment of the invention
• FIG. 2 presents an example of a description file of a multimedia scene according to a particular embodiment of the invention
• FIG. 3 shows an example of a part of the simplified structure of a client terminal implementing a memory management technique according to a particular embodiment of the invention.
• the general principle of the invention relies on the memorization of a portion of a multimedia scene, simultaneously with the rendering of the scene, in a client terminal.
• the method according to the invention allows the storage of a portion of a multimedia scene without altering the simultaneous reproduction of the same multimedia scene, in continuous or progressive loading mode.
• FIG. 1 shows an exemplary implementation of the memory management method in a client terminal, according to a particular embodiment of the invention.
• a multimedia stream, described in accordance with this embodiment of the invention is considered, transmitted by a server to a client terminal.
• the memory management method firstly comprises a step 10 of reception, by the client terminal, of the multimedia scene transmitted in the stream, and two simultaneous steps, one of rendering the scene in the mode streaming or progressive, the other memorizing 12 a portion of the scene.
• the storage step 12 is active only when the data being received corresponds to a portion of the scene to be stored.
• the client terminal detects a storage indicator (described below in connection with Figure 2) for a portion of the scene, it stores the portion in question, while continuing the restitution of the scene.
• this storage step 12 is associated, according to the present embodiment, with a step 121 of management of an address table, in which a remote address is associated, for example corresponding to the address used for the request to the scene, also called URL ("Uniform Resource Locator" in English), and a local address for memorizing the portion of the scene in the terminal.
• a remote address is associated, for example corresponding to the address used for the request to the scene, also called URL ("Uniform Resource Locator" in English
• URL Uniform Resource Locator
• This rendering of a portion of the scene corresponds to a request, that is to say a call to a remote address, defining the means of accessing the portion in question.
• the memory management according to this embodiment makes it possible to know, thanks to the address table, whether this portion is stored in the terminal. If this is the case, the terminal retrieves the portion in question in memory, so as to restore it during a step 14 of restitution.
• the terminal searches, in the address association table previously entered (at moment of the memory of the portion), the local address where the portion is stored.
• the terminal can locally find the stored portion instead of making a request corresponding to the remote address.
• the client terminal receives this description file 20 from the scene and processes it so that it can render the scene.
• a file 20 for describing a multimedia scene comprises a header 21 (or a configuration area placed in the description file), in which parameters are defined allowing, in particular, the terminal of manage portions of the scene in memory.
• a storage indicator 22 allows the terminal to know if one or more portions of the scene must be memorized or not.
• the indicator 22 may for example be a Boolean, equal to 1 to indicate a request for storage and equal to 0 otherwise.
• this indicator whatever its value, can mean a storage request, and consequently the absence of this indicator implies that no storage is required. required.
• the indicator 22 may be a temporal signal, that is to say transmitted at a certain moment of the transmission of the multimedia scene, indicating that the portion of the scene received by the terminal before this indicator must stored, and the portion received afterwards must not be.
• this indicator allows the terminal to know if one or more portions of the scene must be stored.
• the header 21 of the description file 20 also includes an expiry parameter, defining a maximum storage duration 23 of the portion of the scene in the memory of the client terminal.
• This parameter also called TTL ("Time To Live” in English), makes it possible to define the lifetime in memory in a terminal of a portion of a multimedia scene.
• a file header or a file configuration area, including a storage flag (specifying a request to store a portion of a multimedia scene), followed by a maximum storage duration. equal to one minute.
• the client terminal After processing this description file of the scene, and particularly of its header, the client terminal will memorize the portion of the scene in question for one minute, and will release the memory at the end of this minute.
• the header 21 of the file may also include an address, called remote address 24, corresponding to the means of accessing a portion of the scene for its return.
• This remote address may correspond for example to the URL used in the request to the scene, that is to say the address to access the server hosting all the data corresponding to the scene.
• the memory management method implemented in the terminal will store, at the same time as the scene portion considered, the remote address corresponding to the access to this element, and associate it with the local address in the terminal memory. This address association, managed in an address table, allows the terminal to access the portion of scene in memory instead of making a request to the remote address.
• the remote address parameter does not appear in the header of the file.
• the terminal can then use the referencing address used to obtain the scene portion to be stored as a local memory address, which will then allow it to find the scene portion locally.
• This "permanent" parameter may be for example a boolean indicating, when it is equal to 1, that the portion of the scene to be stored must be stored in memory beyond the client session for the maximum storage duration specified in the parameter 23. When it is equal to 0, the terminal knows that the memorized portion should not be kept beyond the client session.
• this parameter indicates, by its only presence in the header of the file, and whatever its value, that the portion of the stored scene must be kept beyond the user session .
• This parameter allows the terminal to retain portions of multimedia scene that can be used for the rendering of several different scenes, and thus saves in terms of data transmitted, some data not being transmitted because already stored in the terminal.
• This "permanent" parameter can also be called “non-transient”.
• the following parameters can be considered in the header of the description file of the multimedia scene: storage indicator 22: "Cacheable”; maximum storage time 23: “clientCacheTtl”; - parameter 25: "permanent”.
• Such a client terminal comprises a memory 31 consisting of a buffer memory, a processing unit 32, equipped for example with a microprocessor ⁇ P, and driven by the computer program 33, implementing the memory management method according to the invention.
• the code instructions of the computer program 33 are for example loaded into a RAM memory before being executed by the processor of the processing unit 32.
• the processing unit 32 receives as input a stream multimedia device comprising at least one multimedia scene.
• the microprocessor of the processing unit 32 implements the steps of the memory management method described above, according to the instructions of the computer program 33, for rendering the multimedia scene in a streaming (streaming) or progressive loading mode. and memorize a portion of the scene.
• the client terminal comprises, in addition to the buffer memory 31, means for rendering the multimedia scene in streaming or progressive mode and means for memorizing a portion of the scene. These means are controlled by the microprocessor of the processing unit 32.
• the processing unit 32 thus makes it possible simultaneously to restore the scene and to memorize portions of the scene.

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• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Computer Security & Cryptography (AREA)
• Business, Economics & Management (AREA)
• General Business, Economics & Management (AREA)
• Information Transfer Between Computers (AREA)
• Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

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• 2006
  • 2006-10-18 FR FR0609144A patent/FR2907625B1/fr not_active Expired - Fee Related
• 2007
  • 2007-10-16 US US12/446,410 patent/US8527885B2/en active Active
  • 2007-10-16 EP EP07821398A patent/EP2077017A1/de not_active Withdrawn
  • 2007-10-16 WO PCT/EP2007/061032 patent/WO2008046827A1/fr active Application Filing
  • 2007-10-16 CN CN200780038794.9A patent/CN101529855B/zh not_active Expired - Fee Related

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