Receiver driven media streaming in a network node

[0001] The invention relates to a device for either generating or maintaining an organic network having a dynamic topology, a method for it and a carrier provided with software for it.

[0002] It is known for instance from U.S. Pat. No. 6,052,718, to duplicate a server in an internet environment to relieve the main server. In those cases however the entire server software and complete files of the server are duplicated. This first of all is too large a burden for the duplicate. Additionally not any given computer will be suitable for that purpose, let alone any given computer requesting information to the server (the “client”). Additionally it is not possible to offer a client an optimal transfer speed of the content in this way by an intelligent choice of the route or possibly another, closer (regarding the transfer speed) (duplicate) server.

[0003] Additionally it is known from U.S. Pat. No. 5,944,783 to provide data packages with software (Java Applets) with which the content of the data packages or other data can be processed on the receiving computer. In this case, however, there is no question of communication, but of distributed processing. One large task is divided over several agents, wherein each agent carries out a part of the task and is in contact with the common server.

[0004] Additionally a network (“multicast network”) of nodes is known from U.S. Pat. No. 5,511,167 which nodes, however, are each part of a hierarchic system. Each node is centrally controlled here by means of a central node.

[0005] In Onn Shehory et al., Agent Cloning: an Approach to Agent Mobility and Resource Allocation, IEEE Communications Magazine, July 1998, a multi-agent system is described comprising agents which can duplicate themselves on remote computers when overload of the agent occurs. The duplicate agent is hierarchically placed below the original agent. This requires an overhead structure. An agent is sent out to perform a task, and reports back to its origin.

[0006] In U.S. Pat. No. 6,085,240 a system of agents is described. The agent devices are managed by an overlaying structure. Thus, the system requires an overhead structure.

[0007] It is an object of the invention to at least partially remove the drawbacks mentioned explicitly or or implicitly.

[0008] To that end the invention provides a device for either generating or maintaining an organic data network having a dynamic topology, comprising

[0009] a data processing unit,

[0010] at least one data connection to a data network to which several devices provided with a data processing unit are connected by means of a data connection, and

[0011] software having

[0012] a receiving routine for receiving data packages of at least one transmitting device in the data network,

[0013] a transmission routine for transmitting data packages, received from the transmitting device or devices in the data network to at least one receiving device that is connected to the data network, independent of the transmitting device or devices.

[0014] By choosing such a device an organic data network can be built up or created in which independent devices according to the invention are able to provide other independent devices according to the invention with data so that for instance data that are available to a network are quickly accessible to any given device in a network.

[0015] Additionally it is possible to build up a data network without hierarchy, in contrast to the classic networks and the internet. After all, when a server fails or gets overloaded very many computers drop out of the network It is possible therefore, using a device according to the invention, to build or maintain a network having a very low failure sensitivity.

[0016] Additionally it is possible to set up a reliable “streaming” video or audio broadcast via the internet or another similarly organised network.

[0017] For that matter numerous applications of so-called peer-to-peer networks that may or may not have client/server technology are known.

[0018] However, an organic network having a dynamic topology wherein data transfer between server and client takes place like in the device according to the invention, is not described in them. In conformity with the device according to the invention it is namely possible that the same peer at one moment acts as server having a second peer as client and at another moment acts as client of the second peer now acting as server, without a control being at the basis thereof. The two devices change role on their own initiative.

[0019] Content as meant in the present invention relates to the data such as music in digital form, converted images in digital form, data base information, simple ascii data, but all other possible data as well. This is the information that has to be distributed to as many devices as possible when they request such. For instance in internet terms, streaming video or streaming audio can be thought of. In this case the quality of a data connection is particularly important. Content namely is generally divided into smaller data packages, that are subsequently transmitted. In case of a streaming audio or video application the sequential order of several data packages is of importance because en route delaying during the transmission of a data package results in an irregular broadcast.

[0020] A data processing unit according to the invention first of all relates to a digital data processing unit, or a central processing unit, CPU, having ALU, a calculation unit, such as known from the so-called PC or other similar computers. In a broader sense processors can be thought of that may among others be placed in mobile phones and other equipment for the (electronic) control of internal processes.

[0021] A data storage unit as meant according to the invention may be a generally known computer memory (RAM), but also a hard disk or another dynamic data storage medium.

[0022] According to the invention a data network does not only mean a physically cabled network; it may also comprise a series of data connections that use electromagnetic waves that propagate through the air or an optical cable. Combinations are also possible. A physically cabled network may also comprise a data network that uses cabling for conducting current (power voltage). In this text a data network is also called network for short.

[0023] In this text by a connection first of all a physical connection is mean, for instance a cable, optical cable, electricity cable, or any possible physical connection over which data packages can be transmitted in electromagnetic form. By connection (sometimes called data connection) is also meant a wireless connection, such as via infrared or radio waves or otherwise.

[0024] Preferably the software is provided with a transmission routine for transmitting the software together with the data packages independent of the transmitting device. In this way a new device can quickly be added in the network.

[0025] In an embodiment, the software is provided with a test routine for testing connections with other devices in the data network.

[0026] Additionally, in the same or another embodiment in a device according to the invention the software is provided with a transmission routine for transmitting data packages to receiving devices in the data network devices other than the transmitting and receiving devices in the network ordering to that end.

[0027] In the same or another embodiment of the invention, the software comprises a conversion routine for either converting or transforming the data packages.

[0028] In the same or another embodiment of the invention, the software is provided with an evaluation routine for evaluating the quality of the data connections.

[0029] In the same or another embodiment of the invention, the software is further provided with an inventory routine for making an inventory of at least a number of the other devices in the data network, and trying out the connection to another device in the data network for transmitting and/or receiving when existing connections are broken off or come below a threshold value.

[0030] In the same or another embodiment of the invention, the device is provided with a memory for storing a data network address of at least one other device in the data network.

[0031] In the same or another embodiment of the invention, the software is provided with a decision routine which on the basis of predetermined criteria decide to make a new connection to either an additional device or another transmitting device.

[0032] In the same or another embodiment of the invention, the device is provided with an environment evaluation routine for asking for addresses of devices that are connected to the transmitting and/or receiving devices. In this way a device can operate even better autonomously in the network and change the topology.

[0033] Additionally the invention relates to software, suitable for a device described above. Said software may for instance be placed on a data carrier such as, by way of example, a CD, DVD, optomagnetic disk, tape, but also in an IC such as a PROM, EPROM, or directly on a produced IC.

[0034] The invention moreover relates to a method for setting up and maintaining an organic data network, of which the nodes are provided with a data processing unit and software having

[0035] a receiving routine for receiving data packages of at least one transmitting device in the data network,

[0036] a transmission routine for transmitting data packages, received from the transmitting device or devices in the data network to at least one receiving device that is connected to the data network, independent of the transmitting device or devices,

[0037] wherein the software either receives content, split up in data packages, from one or more transmitting devices, or retrieves content from the device itself and either delivers or passes on the content, which may or may not be in the form of data packages, to one or more receiving devices, independent of the transmitting devices.

[0038] In this way an organic network as described can be set up and maintained.

[0039] In the same or another embodiment of the method according to the invention, the method according to the invention that the software, when the quality of a connection with the transmitting device deteriorates or appears to be insufficient, asks for addresses of other devices from the transmitting and receiving devices connected to the device, contacts at least one of said other devices, tests the quality of the connection to one or more other devices, and subject to satisfactory performance of one or more of those connections effects a connection to suitable other devices and adds it to the device as transmitting devices, and repeats the asking until the total receipt of data packages complies with a predetermined criterion.

[0040] In the same or another embodiment of the method according to the invention, the method according to the invention the software breaks off a connection to a transmitting device when the quality is lower than a predetermined criterion.

[0041] Additionally the invention particularly relates to mobile communication equipment, a media player, communication equipment, or traffic information system comprising a device according to the invention. Conventional telephones as well may be provided with such a device according to the invention. Furthermore, satelite communication, and especially inter-satelite communication, may also comprise a device, method or software according to the present invention.

[0042] In this case by mobile communication equipment are among others meant mobile phones, walkie-talkies, satellite telephones, pocket computers, PDAs, game computers, that may or may not be portable and wherein a game can be played wireless with a game computer, and the like.

[0043] By a media player is meant a television, radio or playback equipment for prerecorded music or films, but also personal computers that are suitable to that end.

[0044] By a traffic information system is for instance meant a route navigation system for cars, that may or may not be provided with GPS, trains, planes, boats, but also systems that provide vehicles with information, such as car radios and any other possible system, among others radar.

[0045] The invention additionally relates to software for either generating or maintaining an organic data network having a dynamic topology, comprising a receiving routine for receiving data packages of various transmitters, a transmission routine for transmitting data packages to various receivers, a management routine for keeping up the data packages received, data packages transmitted, addresses of transmitters and receivers of data packages, an evaluation routine for evaluating the quantity, time intervals and quality of the incoming flow of data packages, a search routine for searching new potential transmitters via transmitters and receivers, a test routine for testing the quality of data connections to new potential transmitters, and a decision routine for deciding to set up connections to new transmitters and closing down connections to transmitters.

[0046] A possible device according to the invention is a consumer node that will be discussed below. The device according to the invention is not limited to that however.

[0047] In an organic data network that can be built up and maintained by means of a device according to the invention, various types of nodes can be distinguished. Not all these types of nodes are essential to the activity of the data network. Preferably a node is adapted such that the node can change type by means of the software, or may even be several types at the same time. The later being preferred in view of achieving a maximum flexibility of the organic network.

[0048] The first node is a node transmitting content to other nodes when they request such. Such a node is further called production node.

[0049] Additionally a number of portal nodes may be defined. These are nodes that keep up a list of nodes in the network and are able to insert a node to be newly inserted into the data network. Said nodes are not of essential importance to an organic network according to the invention.

[0050] Central in the network are the consumer nodes. Said nodes are provided with software to receive content and to deliver it to other nodes requesting such independent of the source. Additionally the software may be provided with routines to test the quality of a data connection and to keep up to date with the location of a number of other nodes in the network. The consumer nodes may preferably generate content themselves as well, and in that way obtain either a part, or the entire functionality of the production nodes.

[0051] Finally so-called router nodes may be present. Such nodes do nothing else but receiving and sending on content to other nodes in the network by order of production nodes or consumer nodes.

[0052] As already discussed before, a node ensures the availability of content for anyone (client) requesting said content. An organic network may expand or start in the following manner. When a first client requests (a part of) the content from a production node, the production node will deliver the content, but at the same time send along the software as a result of which the first client changes into a first consumer node. When a second client now contacts the production node, the production node will, when the second client is not yet provided with software to act like a device according to the invention, send the necessary software, or refer the new client to an existing consumer node to that end, for instance the first consumer node. The second client then also becomes second consumer node and will if necessary search for a better connection. When the connection to the first consumer node is faster than the connection to the production node, the second consumer node can, if so desired, (entirely or partially) connect to the first consumer node, and the software according to the invention is also sent along as well, as a result of which said client changes into a second consumer node. Said second consumer node may get its content from either the production node, or from the first consumer node, whichever data connection it judges as being the better one. Special however is that the consumer node is able to act entirely autonomous and independent of the production node. Better yet, if so desired the consumer node is able to adapt the content, add content itself (for instance subtitling in a certain language in a streaming video content) or generate its own content, such as local advertising messages, or local news. As a result a consumer node simultaneously is a production node.

[0053] A new consumer node will generally be added to the network by initial contact with a production node or a portal node. Said nodes will enable the newcomer to connect to one, or preferably more existing consumer node or nodes (at a time). A new node might at its own initiative, entirely autonomously, go look for an even better connection. This process may be supported because the new node may get information from the nodes to which it is connected about nodes that they in turn are connected to. Said neighbour information may be used to improve the own connection or to have spare connections available in case of failures. Preferably there generally is no question of central control here, so that flexibility and failure sensitivity are reduced.

[0054] The nodes, if so desired, may itself, instead of or in addition to just passing on the content at request, add content or change content. For instance local subtitling, advertising messages, conversion of file formats, adding securities, etc. The node then in fact simultaneously becomes a production node. A production node or consumer node may also add authenticity securities so that the receiving nodes know whether the content is reliable. The source of the content can do that as well, and each transmitting node can for instance check whether the content it delivers is indeed reliable. In this way a network is created having a high degree of reliability with regard to the authenticity of the content.

[0055] With a growing number of consumer nodes a data network is created. As said consumer nodes can deal with a request for content themselves, and may be are able to make a selection of an optimal connection (in the sense of reliability and/or transmission speed), and the node may be provided with further functionalities, the consumer node may also be called an intelligent node. The resulting data network has the characteristics of an organism, of which the various parts (nodes) are able to “live” independently. During data transfer, particularly during data transfer wherein the sequential order is of importance, such as for instance streaming audio and streaming video in internet applications, an optimal data connection is of great importance. Additionally the capacity of a server that provides content usually is only capable of serving a limited number of clients, while the organic network of the invention, in contrast, has a nearly unlimited capacity which grows with the number of users.

[0056] In the device according to the invention each consumer node with a certain overcapacity will be able to contribute to the increase of the total distribution capacity of the network when added to this network. The larger the network becomes, i.e. the more nodes, the more capacity will be available and the quicker the network potentially may become, without expansion of the capacity of the server, by using the device according to the invention. The device according to the invention uses the intrinsic overcapacity present in a network, for instance because most computers have a full-duplex data connection and only transmit or receive at certain moments. A production or consumer node having a limited transmission capacity can still transmit relatively much content over a network of many consumer nodes using its unused capacity. The unused receive or transmit capacity can be used by other nodes to obtain content or transmit it to other nodes. It may even be so that as the transmission capacity of the production node becomes smaller (to a certain extent: at least one receiver should of course be able to get sufficient content in), as a result of the mutual cooperation of the consumer nodes, the speed of the flow through the network will increase.

[0057] As already discussed a number of portal nodes may be defined that contain a list of the various consumer nodes that are operational and maybe various production nodes. A new client may instead of contacting a production node, contact a portal node, which from the list of consumer nodes selects the one who (as to data transfer speed) is the closest. Possibly the portal node may also (start with) transmitting software to install the new client as consumer node. The new client will subsequently connect to an existing consumer node and changes into a new consumer node.

[0058] In the process or data network described above, several types of nodes have been mentioned. Most of these nodes may also be defined by one base node.

[0059] One base node can be distinguished that has all functionalities, but of which several parts can be switched on or off depending on the functions of the node in the organic network according to the invention.

[0060] For instance every node has an input manager and an output manager, buffers, router logics, a local production connection manager, and a local consumer connection manager.

[0061] Below some examples are described wherein an organic network according to the invention can be deployed. Said examples are not limiting, but elucidate the invention. The expert will, on the basis of said examples, be able to think of many other embodiments that fall under the scope of protection of the claims.

[0062] Streaming Internet Applications

[0063] Streaming video and streaming audio are known internet applications in which data packages with contents are transmitted from a server or station to clients or consumers. The special thing about these data packages is that the time sequence of the various packages is of importance: a radio broadcast, for instance, has a fixed time line. Additionally the continuity of the data flow is of importance, as otherwise the broadcast will falter. The general principles of such streaming internet application are known to the expert.

[0064] A streaming video or audio broadcast via the internet or another data network may be implemented by means of the organic data network in the following manner by means of a device according to the invention.

[0065] First of all a so-called production node is installed. A production node is a device according to the invention the purpose of which is to make the content, either generated or present in the device itself, available to one or more other devices. Said content may be a streaming audio or video broadcast

[0066] As soon as a computer, for instance through the internet, contacts the production node, the production node will start transmitting content, accompanied by software, for instance in the form of a “Java applet” or “Java bean”, but also in the form of a so-called Windows “Cabinet file”. The software subsequently installs itself on the computer and adjusts the computer as a so-called consumer node. As already discussed such a consumer node is capable of receiving content from a device, in this case a production node, and to deliver said content to another device when it requests such.

[0067] When for instance a second device presents itself to a production node with the question to also get content, the production node will transmit the software, when needed, to said second device or, when for instance all outgoing connection are occupied, inform the second device of the existence of the consumer node installed earlier on.

[0068] Either the production node sends software directly, or through the consumer node to make the second device act as consumer node to the second device, and the second device is installed as second consumer node. The second consumer node will test whether the connection to the production node or to the first consumer node is the best, and subsequently decide whether the content will have to come from either the production node, or via the first consumer node or from both. The first consumer node is able to deliver the content to the second consumer node entirely independent of the production node.

[0069] Should the second consumer node get a better connection to the production node, said direct contact will lead to the first consumer node deciding to get the content via the second consumer node. From this the dynamic topology appears that may be obtained: the node reverse their rolls.

[0070] The invention is further elucidated on the basis of several figures showing various aspects of the invention. It should be clear that said figures serve to elucidate the invention, and should not be seen as a limitation of the invention to the embodiments shown in them.

[0078] FIG. 1 show a base node 1.0 discussed earlier, that is provided with all functionality that make it possible to let the base node function as production node, consumer node, router node or portal node. By switching on or switching off the various functionalities the base node may function as one of the nodes mentioned, or even as a combination thereof or in several capacities acting alongside each other.

[0079] The base node is provided with an input manager 1.1 and an output manager 1.4. These are routines in the software that regulate the incoming and outgoing content. Additionally the base node is provided with so-called router logics 1.5 to send on the contents received.

[0080] Additionally the base node is provided with one or more buffers 1.6 to store data for possibly sending it on further.

[0081] Finally the base node is provided with a local production manager 1.2 to make the content ready for transmission, and a local consumer manager 1.3 to make the incoming content ready for processing and possible play-back (in case of streaming audio or video).

[0082] The FIGS. 2A-2Q show several stages of initiating an organic network. The thick lines are connections between nodes. The stripe broken line is a message to a node, the dotted line is the information regarding the nodes connected to the presenting node, a thin line is contacting and testing the quality of a connection.

[0083] FIG. 2A shows an organic network having a production node 1. The production node delivers content, for instance a streaming audio broadcast via the internet to two consumer nodes 2 and 2′. The content in that case is divided into data packages which are transmitted via the internet. To each of both consumer nodes consumer node 3 and 3′ are respectively connected. To 3′ a next consumer node 4 is connected. Two portal nodes 0 and 0′ are also shown.

[0084] The consumer nodes 2 and 2′ deliver content that they receive from the production node through to the consumer nodes 3 and 3′, consumer node 3 in its turn delivers through to 4. As a result only two consumer nodes are directly connected to the production node.

[0085] From a certain situation as shown in FIG. 2A a possible development of the organic network will now be followed in the FIGS. 2B-2Q.

[0086] In FIG. 2B production node 1 sends a message to consumer node 2 in which the existence of consumer node 2′ is mentioned.

[0087] In FIG. 2C it can be seen that consumer node 2 is testing the connection to consumer node 2′. Apparently consumer node 2′ has capacity to spare and a quicker connection to the production node. For instance, in case of an internet application, consumer node 2 may be connected via an analogous modern having a baud rate of 56k6, while consumer node 2′ is connected by means of for instance a cable modem, and the actual connection between the production node and consumer node 2 is 28k8 at a maximum. This whereas consumer node 2 can handle 56K6: consumer node 2′ receives the content at high speed, higher than 56k6, from the production node and starts to send the content to consumer node 2, independent of the production node, at a speed of 28k8. Consumer node 2 now obtains the content at a speed on 56k6 instead of 28k8 (for instance). This situation is shown in FIG. 2D. In FIG. 2D the production node also remains transmitting content to consumer node 2. Node 3 also obtains information delivered from node 2 about the nodes connected to said node.

[0088] In FIG. 2E consumer node 3 is testing, for instance because its connections are not optimal, the connection to various nodes in the network of which it now (directly or indirectly) knows of its existence. This testing may for instance take place because the connection to consumer node 2 gets worse and worse. On this case consumer node 3 tests the connection to production node 1 and consumer node 2′. It appears that consumer node 2′ still has capacity to spare. Consumer node 2′ now also starts to send content to consumer node 3 (FIG. 2F).

[0089] In FIG. 2G it can be seen how a new consumer node 5 is realised via a portal node 0. The consumer node to-be contacts portal node 0. Should it be the case that said node is not a consumer node yet, and has yet to receive software to be installed as such, the node (to-be) can obtain said software from the portal node 0. As of the moment the software has been installed, the node is a consumer node as well (and in fact it can then also start to operate as production node if it wants to).

[0090] In the figure the portal node selects a consumer node from the list it keeps up to date, in this case consumer node 4, that may or may not be added last. Should a node newly to be added not be a consumer node yet, then it will obtain the necessary software (in this case) from the portal node, as well as the information about the presence of consumer node 4 (FIG. 2H). Consumer node 5 in its turn tests the connection to consumer node 4 (FIG. 2I) and contacts consumer node 4 (FIG. 2J).

[0091] In FIG. 2K, consumer node 5 obtains information about consumer node 3 from consumer node 4 and subsequently tests (FIG. 2L) the connection to consumer node 3. When it appears that consumer node 3 has transmission capacity to spare and consumer node 5 has receiving capacity to spare, consumer node 3 will also send content to consumer node 5 independent of the production node or consumer node 2 (FIG. 2M). Consumer node 5 gears with 4 and 3 what it wants to receive.

[0092] In FIG. 2N consumer node 3 tells consumer node 2 about the existence of nodes 2′, 4 and 5. In FIG. 2O it can then be seen that node 2 is testing the connection to 5, possibly because its connection deteriorates or the connection to 5 is better.

[0093] In FIG. 2P the connection between consumer node 5 and 2 has been made.

[0094] In FIG. 2Q it appears that the connection between 2 and 5 and 5 and 3 is so good that 3 now obtains its data packages via 5 instead of 2. The connection between 3 and 2 is broken off.

[0095] In FIGS. 3A-3L a device according to the invention is implemented in a mobile phone network. The white arrows here indicate a short control signal, the grey arrows a signal having one conversation, and the black arrows signals having two conversations.

[0096] In FIG. 3A mobile phone 11 wants to make contact. The device according to the invention, built in in mobile phone 11, subsequently searches whether a mobile phone in the direct vicinity has already contacted a support transmitter 10. None of the mobile phones in the direct vicinity has contact with support transmitter 10. The device according to the invention subsequently makes contact between mobile phone 11 and the support transmitter 10 (FIG. 3B). Mobile phone 11 starts a first conversation with a mobile phone outside the figure.

[0097] In FIG. 3C it can be seen how the device according to the invention, also implemented in mobile phone 12, searches in the direct vicinity whether a mobile phone has contact with the support transmitter 10. In FIG. 3D it can be seen that mobile phone 12 makes contact with mobile phone 11, which now sends on both conversations to the support transmitter 10.

[0098] In FIG. 3E it can be seen that the conversation of mobile phone 11 has already ended, but that said phone still sends on the conversation of mobile phone 12.

[0099] In FIG. 3F is can be seen that mobile phone 12 has also finished its conversation. Mobile phone 14 wants to call mobile phone 13, but is out of support transmitter 10's reach. Its signal is received by 11, which is able to make contact with the support transmitter. Mobile phone 11 now passes on the signal of 14 to the support transmitter 10, the support transmitter 10 sends on the signal to mobile phone 13 (FIG. 3G).

[0100] Mobile 13 has meanwhile been informed by for instance the support transmitter 10 that 11 is relatively close (they after all use the same support transmitter). Mobile phone 13 subsequently transmits a (small-range) signal asking mobile phone 11 to make contact with 14, which signal is received by 11 (FIG. 3H), which takes over the function of the support transmitter 10 and ensures the connection between 13 and 14 (FIG. 3I). Encryption ensures the confidential nature of the connections.

[0101] Due to a failure mobile phone 11 breaks down (FIG. 3J). Both 13 and 14 send out a call for help. Mobile phone 12 receives both calls and takes over the role of 11 (FIG. 3L).

[0102] Because of the autonomy of the device according to the invention it is possible first of all to make direct contact between mobile phones that are in each other's vicinity. Additionally it is possible to take care of failures because of the dynamic nature of the topology.

[0103] Moreover, by means of the device according to the invention it is possible with a weak support transmitter (preferably as weak as possible, as the mobile phones then will go looking for an alternative route more quickly) and many mobile phones in each other's vicinity to have a good connection with a minimum of transmission capacity of the support transmitter 10.

[0104] In FIG. 4A a traffic situation is shown, in which on one side of the road 48 and obstacle 40 is present that limits or blocks the circulation, as a result of which cars 43 and 42 come to a standstill. On the opposite side of the road 47 an approaching car 41 arrives. Apply before the blockage 40 there is an exit 49 with an alternative route. The cars are equipped with a device according to the invention.

[0105] In FIG. 4B it can be seen how the approaching car 41 obtains information from the stationary car 42 that it stands still. The car 41 drives on, and in FIG. 4C it can be seen how a car 44 on the side of the road 48 approaches the obstacle.

[0106] In FIG. 4D the car 41 delivers information to requesting car 44, independent of the transmitting car 42.

[0107] In FIG. 4E it can be seen that car 44 decides to take an alternative route via exit 49.

[0108] The device according to the invention, implemented in a car-information system, in this case receives the information from the transmitting car 42 and independent of the transmitting car sends it through to car 44. In this way car 41 informs the cars coming up behind independent of the cars that sent the information regarding the obstacle, in this example car 42.

[0109] Another example of the application of the device according to the invention is in television. In FIG. 5A a situation is shown wherein a number of television sets 54, 55, 57, 58, 59 are connected by means of a cable network 61 to transmission/broadcasting station 50. Television 56 is connected to its own dish antenna 51. Apart from that the televisions are connected to an electricity grid 60, and provided with means for transmitting and receiving data packages via the electricity grid.

[0110] Television 53, that is not connected via a cable network to the other televisions, but indeed via the electricity grid 60, also has its own satellite connection. Televisions 56 and 53 transmit the signals of the dish antennas 51 and 52 to the other televisions via a device according to the invention. The white circles are content coming from satellites 51 and 52 which is passed on to the other television sets by television sets 53 and 56 via the electricity grid. The grey circles are content that are delivered to television sets 54, 55, 57, 58 and 59 by transmitter 50 via the cable 61.

[0111] In FIG. 5B it can be seen how a failure arises in the connection between television 56 and 55. Televisions 54 and 55 send out an emergency signal (grey square) via the electricity grid, that is received by a device according to the invention in a television set that still gets a signal. Said television set (in fact the device according to the invention), in FIG. 5C television set 57, 58 and 59 receive the emergency signal. Said television sets send a signal to 54 and 55 via the electricity grid that they are able to deliver, and at the request of television sets 54 and 55 they start to deliver via the electricity grid (pale grey circles, FIG. 5D). In FIG. 5E it can be seen that the television sets 54 and 55 actually obtain the cable signal. The pale grey circles reach sets 54 and 55.

[0112] This example can of course also relate to personal computers, game computers, or even domestic appliances that are connected via a network or wireless, possibly via for instance the blue tooth protocol. Via an alternative channel, but that alternative may also be overcapacity on a certain cabling, errors can be put right or for instance inertia of data transport can be solved.

[0113] FIGS. 6A-6K show the transmission of content in data packages from one point over a network such that those data are available to everybody. That may for instance be streaming video or audio.

[0114] Production node 120 has content “12345678” at its disposal, and sends it to two consumer nodes 122 and 123 who request such. The flow via 123 goes much quicker than via 122. In FIG. 6B it can be seen that the first data package “1” has already been received by 123, whereas 122 still has nothing. Meanwhile 122 and 123 receive requests from 124, 126 and 127, 125, respectively. The data packages to 123 go so quickly that 123 has meanwhile received two packages already, and the connection of 123 to 127 is so good that 127 as well has already received one data package. It is therefore able to grant a request from consumer node 129 and to start sending on (FIG. 6C).

[0115] In FIG. 6D the consumer node 123 has meanwhile received three data packages already, and because the connection of 123 and 127 is so fast, 127 as well has already received two data packages. Node 125 has meanwhile been informed of the existence of 127 via 123 and has tested the data connection to 127. Because also this data connection appeared to be good, considerably faster than the data connection to 123, the node 125 has decided to request 127 to deliver the data packages. Additionally 131 has also put in a request for delivery of content and is connected to consumer node 129.

[0116] As the connection via node 122 of consumer node 126 appeared to be slow, consumer node 126 goes looking for a better connection and finally ends up at consumer node 129. At the request of consumer node 126, consumer node 129 now also starts delivering data packages to 126. In this case the dynamic topology already seems to occur and the result of the dynamic topology is apparent. Consumer node 126 then disconnects the connection to consumer node 122. Meanwhile nodes 128 and 130 as well are added to the network as consumer nodes. This situation is shown in FIG. 6E.

[0117] Consumer node 124 as well, due to the slow connection of consumer node 122 to the production node 120, goes looking for a better connection, and ends up at consumer node 126. At the request of consumer node 124, consumer node 126 now also starts delivering data packages to consumer node 124. This situation is shown in FIG. 6F. Meanwhile consumer nodes 128 and 130 still receive data package “1” that comes from the chain 120-122-124.

[0118] In FIG. 6G it can be seen that the delivery of data packages from the lower chain 123-127-129 goes much quicker than the delivery from production node 120 to consumer node 122. Additionally it can also be seen that the connection of consumer nodes 128 and 130 to consumer node 124 is not optimal: consumer nodes 128 and 130 have received 2 data packages, whereas consumer node 131 has already received 4 data packages. Consumer nodes 128 and 130 are going to look for a better connection, and 128 chooses to use the overcapacity of consumer node 131. This is shown in FIG. 6H. It can also be seen that consumer node 123 has now received all content and the connection to the production node is no longer used.

[0119] In FIG. 6I it can be seen that only consumer nodes 128, 130 and 122 have not yet received all content. In FIG. 6J all consumer nodes except 122 have received all content.

[0120] In this example it apparently was not possible for consumer node 122 to find a better connection to another node. When, however, it would have appeared for instance that the connection via consumer node 124 was better than the direct connection to the production node, the situation could have arisen that the consumer node 122 decided to request whether consumer node 124 could deliver data packages, as a result of which in fact the part of consumer node had been reversed from receiving consumer node to delivering consumer node. Preferably the consumer nodes are set up in such a way that they only go looking for a new or additional connection when an existing connection is not satisfactory (any more).

[0121] FIGS. 7-15 show a specific embodiment of a production node according to the present invention, and specifically show the data streams through such a production node (FIGS. 7-11) and through a consumer node (FIGS. 12-15). The data streams which are transmitted may be mp3 streams. The streams in this embodiment are transmitted over the internet. In this description of the drawings, reference will be made to mp3 streams. However, it must be clear that any data stream may be transmitted using this production node. The different building block of the production node and the consumer node, e.g. buffer, Router Logic, etcetera are software objects which may be programmed in any suitable general purpose programming language, like C++, Java, or any task-specific language. These objects are known to a man skilled in the art.

[0122] FIG. 7 shows the processing of opening a media stream by a Production Node (PN). A Stream Target (media player) requests a media stream through portal with: http://localhost:123/192.1.0.10/stream.mp3

[0123] The following steps are preformed:

[0124] Step 1: Consumer Manager (CM) receives and recognizes a request

[0125] Step 2: CM asks Router Logic (RL) for action

[0126] Step 3: RL asks portal (192.1.0.10) for IP address Stream Source (SS)

[0127] Step 4: Portal returns IP address SS: 24.25.26.27

[0128] Step 5: RL asks Production Manager (PM) to call SS

[0129] Step 6: PM request SS with: http://24.25.26.27/stream.mp3

[0130] Step 7: SS returns media stream and http header

[0131] Step 8a: PM parses data and sends media stream to Buffer

[0132] Step 8b: PM returns http header to RL

[0133] Step 9: RL returns http header to CM

[0134] Step 10: CM returns http header to Stream Target

[0135] In FIG. 8, the Production Node (PN) starts receiving the media stream. When http header has been passed to the Stream Target (step 10 in FIG. 7, the Consumer Manager (CM) starts a data retrieval loop: The Consumer Manager asks data from Buffer and waits for reply. Buffer response could either be:

[0136]

	data media stream	(CM will ask for more) or
	data not ready yet	(CM will wait and try later) or
	end of stream	(CM will close connection).

[0137] The following steps are then performed:

[0138] Step 1: Consumer Manager (CM) requests Buffer for data media stream

[0139] Step 2: Buffer starts sending media stream to CM

[0140] Step 3: CM passes stream to Stream Target

[0141] In FIG. 9, Production Node (PN) receives an incoming request from the Consumer Node (CN). The incoming request from a Consumer Node is received by the Output Manager (OM) of the Production Node. The request consists of network information, which is passed to the Router Logic (RL), and a request for a specific part of the media stream (data blocks) which will be handled by the Buffer.

[0142] Subsequently, the following steps are performed:

[0143] Step 1: Incoming node network request is received by the Output Manager (OM)

[0144] Step 2a: OM passes network information to the Router Logic

[0145] Step 2b: OM requests Buffer for all blocks, including a preferred first block, the Consumer Node is missing.

[0146] In FIGS. 10 and 11, the response of the Production Node (PN) on an incoming request of the Consumer Node (CN) is shown. The following situation may occur:

[0147] The requested data blocks are available

[0148] The data blocks are not available.

[0149] These two possible situations will be further ellucidated.

[0150] Blocks available (FIG. 10)

[0151] The requested blocks are available in the Buffer of the Production Node, together with network information this data is returned to the requesting Consumer Node. The following steps are then performed:

[0152] Step 1a: Network information about PN and the nodes PN is aware off, is returned to the Output Manager (OM) by the Router Logic (RL)

[0153] Step 1b: The requested parts of the media stream (data blocks) are returned by the buffer to the OM

[0154] Step 2: The OM bundles the information and returns this to the CN.

[0155] Blocks NOT available (FIG. 11)

[0156] The requested blocks are NOT available in the Buffer of the Production Node, together with network information this data is returned to the requesting Consumer Node.

[0157] Step 1a: Network information about PN and the nodes PN is aware off, is returned to the Output Manager (OM) by the Router Logic (RL)

[0158] Step 1b: The Buffer returns no data available

[0159] Step 2: The OM returns the network information of the RL to the CN.

[0160] FIG. 12 now shows the different process steps which take place on the side of the Consumer Node (CN) when opening a media stream. A Stream Target (media player) requests a media stream through portal with: http://localhost:123/192.1.0.10/stream.mp3 via the consumer node.

[0161] The following steps then take place:

[0162] Step 1: Consumer Manager (CM) receives and recognizes a request

[0163] Step 2: CM asks Router Logic (RL) for action

[0164] Step 3: RL ask portal (192.1.0.10) for IP address other node (PN or CN) participating in the node network

[0165] Step 4: Portal returns IP address of other node

[0166] Step 5: RL asks Input Manager (IM) to connect other node

[0167] Step 6: IM requests other node for connection

[0168] Step 7: Other node returns media stream and http header

[0169] Step 8a: IM parses data and sends media stream to Buffer

[0170] Step 8b: IM returns http header to RL

[0171] Step 9: RL returns http header to CM

[0172] Step 10: CM returns http header to Stream Target

[0173] In FIG. 13 is shown what happens when the Consumer Node (CN) starts receiving a media stream. When the http header has been passed to the Stream Target, the Consumer Manager (CM) starts a data retrieval loop: asks data from Buffer and waits for reply. Buffer response could either be:

[0174]

	data media stream	(CM will ask for more) or
	data not ready yet	(CM will wait and try later) or
	end of stream	(CM will close connection).

[0175] The following steps are thus performed:

[0176] Step 1: Consumer Manager (CM) requests Buffer for data media stream

[0177] Step 2a: Buffer starts sending media stream to CM

[0178] Step 2b: Router Logic (RL) registers CN as active node at Portal and confirms its connection with other node

[0179] Step 3: CM passes stream to Stream Target

[0180] In FIG. 14 is shown what happens when the Consumer Node (CN) fails to connect after receiving media stream from another Node. For instance, connection from Consumer Node to other node (A.) is lost. Consumer Node reacts by a request to another node (B.) in the node network. This is done by performing the following steps:

[0181] Step 1: Input Manager (IM) fails to connect to other node (A.)

[0182] Step 2: IM asks Router Logic (RL) for another IP address in the node network

[0183] Step 3: Router Logic (RL) returns IP address of another node (B.)

[0184] Step 4: IM sends out a connection request to another node (B.)

[0185] FIG. 15 shows, by way of summary, the different processing streams in an active Consumer Node (CN). It shows in what way the different parts of the consumer node are interconnected.

[0186] The device according to the invention in all examples is autonomously capable of retrieving content from a data network, and sending it on to other devices according to the invention without the intervention of the transmitting side. Additionally each device is capable of testing whether a better connection is within reach, and entirely independently choosing whether to use said connection.

[0187] It is to be understood that the above description is included to illustrate the operation of the preferred embodiments and is not meant to limit the scope of the invention. The scope of the invention is to be limited only by the following claims. From the above discussion, many variations will be apparent to one skilled in the art that would yet be encompassed by the spirit and scope of the present invention.