WO2013180409A1 - Procédé et appareil de réception de données à l'aide d'un minimum de ressources de réseau de communication sans fil et de conversion entre réseaux hétérogènes au moyen d'un terminal de communication sans fil - Google Patents

Procédé et appareil de réception de données à l'aide d'un minimum de ressources de réseau de communication sans fil et de conversion entre réseaux hétérogènes au moyen d'un terminal de communication sans fil Download PDF

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Publication number
WO2013180409A1
WO2013180409A1 PCT/KR2013/004242 KR2013004242W WO2013180409A1 WO 2013180409 A1 WO2013180409 A1 WO 2013180409A1 KR 2013004242 W KR2013004242 W KR 2013004242W WO 2013180409 A1 WO2013180409 A1 WO 2013180409A1
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Prior art keywords
wireless communication
data
communication terminal
communication network
value
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PCT/KR2013/004242
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English (en)
Korean (ko)
Inventor
이승준
김순욱
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주식회사 에어플러그
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Publication of WO2013180409A1 publication Critical patent/WO2013180409A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1446—Reselecting a network or an air interface over a different radio air interface technology wherein at least one of the networks is unlicensed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H04W28/14—Flow control between communication endpoints using intermediate storage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/18—Service support devices; Network management devices

Definitions

  • a plurality of heterogeneous networks in particular, a plurality of heterogeneous networks having different characteristics of a service area or a quality of service are selectively used between a wireless communication terminal and a server so that data of a server can be transmitted to the terminal. And a device therefor.
  • Wi-Fi wireless networks which can support them in real time in case of large amounts of data or content, and, for example, cellular (cellular) )
  • Tends to use data services of mobile communication networks This seems to be due to a communication environment in which high-speed wireless data networks are mainly serviced only in limited areas and provide a cost-effective communication infrastructure for users.
  • the utilization rate of the data service through the mobile communication network of wireless communication terminals increases, and the provision of high-quality video or information that requires high speed through the mobile communication network increases.
  • the data load on the public cellular network becomes significantly greater, and this increase in load dramatically reduces the channel or bandwidth for general purpose communications, such as voice calls. It is also raising.
  • the present invention when playing the content data using a data service through a specific wireless communication network, while maintaining a minimum amount of buffering, so that the video currently played when switching to another wireless communication network can be played seamlessly It is to provide a method and apparatus.
  • the control unit is configured to change the limit value to the emergency value when the state of the wireless communication terminal corresponds to a connection switching precondition.
  • the connection switching precondition is a reception of a command for requesting to switch to a specific wireless communication network among the plurality of wireless communication networks from outside, or when a new wireless communication network other than the connected wireless communication network becomes accessible.
  • the wireless communication terminal may be in a mobility state.
  • control unit is further configured to attempt to switch the connection of the wireless communication terminal when the buffering value for the media data of the receiving unit is greater than or equal to the switching value.
  • the conversion value is greater than at least one of the respective limits specified in the different buffering rules and is less than or equal to the incompatibility value.
  • the control unit before attempting to switch the connection, provides information indicating that the connection can be switched on the screen of the wireless communication terminal, and then switch the connection through the user interface of the wireless communication terminal. Attempt to switch the connection when there is a request of.
  • control unit is further configured to reset the restriction information specified for the type of the wireless communication network newly connected to the receiving unit when the connection is switched.
  • the receiving unit requests a request by a communication protocol requesting data from a point subsequent to the media data received from the previously connected wireless communication network through the newly connected wireless communication network.
  • the media data is further configured to subsequently receive while buffering according to the buffering rules specified by the reset restriction information.
  • the switching of the connection may be a switching between the plurality of wireless communication networks or reconnection in the same wireless communication network.
  • the different buffering rules may be designations of limit values of different sizes limiting buffering by the receiver.
  • the different buffering rules may be to designate a limit limiting the buffering by the receiver and a non-limiting limit of the buffering by the receiver, respectively.
  • the control unit does not change and set the limit value to the emergency value even before the connection of the wireless communication terminal is switched. It is configured not to.
  • the communication means for transmitting and receiving data to and from the outside through communication, and the storage means containing the application to be executed in the wireless communication terminal, transmitted through the communication means It is configured to include.
  • the application checks the type of the connected wireless communication network and selects the restriction information specified for the identified type from the restriction information specified for a plurality of wireless communication networks.
  • a program structure for performing a function for providing and for changing and setting the limit value to a larger emergency value before the connection of the wireless communication terminal is switched.
  • the restriction information used by the application specifies different buffering rules for at least two of the plurality of wireless communication networks.
  • the method further comprises the step of measuring the supported speed on the transmission path to the wireless communication terminal while transmitting the media data at the second data rate.
  • the second step if the measured support rate is less than the third data rate, the media data having at least partially the same content as the transmitted media data but having a required required speed is lower than that of the transmitted media data.
  • the method further includes the step of transmitting to change. At this time, the changed media data may be transmitted at a rate higher than the second data rate within the measured support rate.
  • the information processing unit of the device indicates the type of wireless communication network to which the wireless communication terminal is connected
  • the information processing unit is configured to perform the information on the wireless communication terminal by the first limit value specified for the type of wireless communication network. Configured to reduce the transmission rate to the second data rate after the transmission rate of the communication processing unit becomes the first data rate so that data buffering increases, and further, information on the state is connected to the wireless communication terminal.
  • the first transmission rate and the second transmission rate are determined based on a data rate required when playing the content, all of which are determined to be faster than the data rate.
  • the conversion rate is faster than at least one of the first transmission rate and the second transmission rate.
  • At least one embodiment of the present invention described above, or described in detail with reference to the accompanying drawings allows a wireless communication terminal to display a buffering value (a buffering amount or play time by the amount) of media data to be played.
  • a buffering value a buffering amount or play time by the amount
  • the wireless communication terminal does not need excessive data buffering for safe media play even in a situation in which connection switching may occur arbitrarily, for example, when network switching is possible or mobile.
  • This reduction in the amount of buffering can reduce the load on the wireless communication network to some extent. Given that most of the use of information using wireless networks involves the transmission of video media, such load reduction at each wireless terminal can have a significant effect on the overall load reduction of the wireless network.
  • FIG. 1 is a logical view of a programmatic view of related components of a wireless communication terminal in which an embodiment of a method for switching between heterogeneous networks while receiving data using minimum resources of a wireless communication network according to an embodiment of the present invention is implemented.
  • An embodiment of a method for switching between heterogeneous networks while receiving data using minimum resources of a wireless communication network according to an embodiment of the present invention is implemented.
  • FIG. 2 illustrates a configuration of a wireless communication terminal in which a method for switching between heterogeneous networks while receiving data using minimum resources of a wireless communication network according to an embodiment of the present invention is implemented.
  • FIG. 3 illustrates the components of a media player in a wireless communication terminal, the configuration of which a media player receives and decodes data using a minimum of the resources of the wireless network, while ensuring sufficient data buffering before switching between heterogeneous networks, in accordance with an embodiment of the present invention. Shown with the components,
  • 4 and 5 are examples of flowcharts according to a method of controlling data reception speed so as to receive data using a minimum of resources of a wireless communication network and to ensure sufficient data buffering before switching between heterogeneous networks according to an embodiment of the present invention. ego,
  • FIG. 9 illustrates a process of reading data through a socket and filling a buffer to the limit for data throttling according to a set buffering limit according to an embodiment of the present invention.
  • FIG. 10 is a diagram schematically illustrating a process of increasing the buffering limit value to sufficiently buffer data when the terminal corresponds to a connection switching precondition, according to an embodiment of the present invention.
  • FIG. 11 is an example of media index information created for the case of providing each of the media components of various quality and / or attributes live for a single content
  • FIG. 13 exemplarily illustrates a process of changing the received live video content into a video or audio component requiring a lower required speed and receiving the same;
  • FIG. 15 illustrates an example in which a data transmission speed of a server is adjusted so that data buffering in a wireless communication terminal is appropriately adjusted according to a necessary situation, according to an embodiment of the present invention.
  • 16 is a diagram schematically showing an example in which data buffering is reduced in a wireless communication terminal by adjusting a transmission speed according to an embodiment of the present invention.
  • FIG. 18 is a diagram for explaining a process of increasing a buffering value in a terminal by changing the quality of the content without adjusting the transmission speed of the content according to an embodiment of the present invention.
  • FIG. 19 illustrates an example in which a data transmission speed of a server is adjusted so that data buffering in a wireless communication terminal is properly maintained according to another embodiment of the present invention.
  • FIG. 20 illustrates an example of a configuration of a content server that enables a terminal to switch between heterogeneous networks while transmitting data using a minimum amount of resources of a wireless communication network according to an embodiment of the present invention.
  • FIG. 1 is a logical view of a programmatic view of related components of a wireless communication terminal in which an embodiment of a method for switching between heterogeneous networks while receiving data using minimum resources of a wireless communication network according to an embodiment of the present invention is implemented. It illustrates the configuration and externally connected configuration.
  • the media player 110 illustrated in the drawing is a process or application implemented in the wireless communication terminal 100, and the code executed based on the operating system 100a as illustrated in FIG. 1. It may be provided in the form of software having a program structure consisting of. When provided in the form of software, the media player having the mass storage means and recorded in the mass storage means through a normal on-line purchase process or the like from a specific server connected to the communication network through the provided communication means. 110 may be executed after being downloaded and installed in the wireless communication terminal 100. In some cases, at least some of the functions of the media player 110 described in detail below may be in the form of middleware, a platform on which applications are based, or the operating system 100a. It may be implemented in the wireless communication terminal 100 in the form of some.
  • the media player 110 since the media player 110 includes a hardware configuration, the hardware may perform some of the functions described in detail below. Accordingly, the scope of the present invention is not limited to the media player 110 whose configuration and operation method are described in detail in various embodiments according to the present invention.
  • the media player 110 is provided with a media processing unit 111 for processing a received data object, for example, content data of a media attribute, and the operating system 100a.
  • a data transmission / reception unit 112 for generating a communication socket through an application program interface (API) and transmitting / receiving data exchanged with the media processing unit 111 to the outside through the generated communication socket, and transmitting and receiving the data.
  • a reception control unit 113 for controlling the data reception speed of the unit 112 as a sub process, and data for data transfer or exchange between the media processing unit 111 and the data transmission / reception unit 112.
  • the channel includes a reception buffer 113a and a transmission buffer 113b. In another embodiment according to the present invention, the transmission buffer may not be implemented.
  • the media processing unit 111 provides the data transmission / reception unit 112 to the data transmission / reception unit 112 via mediators or the like to be transmitted to an external server according to a user's request. 112) composes and sends a request according to the communication protocol, for example, an HTTP request.
  • the UI processing unit for processing a user request may be implemented as a separate process from the media processing unit 111.
  • the UI processing unit provides data or request information to be transmitted to an external server in response to a user's request to the data transmission / reception unit 112 through mediators and the like.
  • the media processing unit 111 may generate a request according to a necessary communication protocol in response to a request from a user and transmit the request to the external server by transmitting the request to the data transmission / reception unit 112 through the transmission buffer 113b.
  • the wireless communication terminal 100 having a logical configuration illustrated in FIG. 1 includes a hardware component as illustrated in FIG. 2 as a whole, and includes a public mobile telephone network or a high-speed wireless data network. It may be any one of a smart phone, a tablet computer, a laptop having a mobile phone function, and the like, which can selectively access a wireless communication network.
  • the public mobile phone network for example, 2G, 3G or 4G cellular mobile communication network (hereinafter referred to as "cellular network") of the designated method
  • the cellular modem 1a a component including an RF signal processing module
  • the cellular modem 1a for transmitting and receiving a signal to and from a corresponding communication network, and encoding or encoding data according to a communication protocol adopted by the cellular network.
  • a cellular codec 1b for decoding the decoded data and a high-speed wireless data network
  • Wi-Fi network for example, a Wi-Fi wireless LAN network (hereinafter referred to as a "Wi-Fi network").
  • Wi-Fi modem 2a a component including an RF signal processing module
  • Wi-Fi codec (2b) for decoding the data frame, a display panel (5) for displaying images, characters, etc., and the display panel (5) so that arbitrary data is visually displayed on the display panel (5)
  • the main controller 10 allows the operating system 100a to perform the intended function by executing the given command codes, and also executes the command codes of the media player 110 to execute the command codes described in detail below.
  • the operations of the media player 110 are performed.
  • the media processing unit 111 of the media player 110 through the appropriate API (Application Program Interface) provided by the operating system 100a for the data blocks of the encoded video or audio, if necessary, It is also possible to use a decoding operation that the decoder 110a processes in hardware.
  • API Application Program Interface
  • the configuration of the wireless communication terminal 100 illustrated in FIG. 2 is just one example for specifically and exemplarily describing an embodiment for helping understanding the concept and the subject of the present invention, and according to the present invention.
  • Terminals implementing the subject matter may further include components of various functions not shown in FIG. 2 or may exclude the illustrated components, and hardware components may be implemented in software.
  • the response received by the browser includes, in addition to the content data transmitted by the content server 12, file description information on content provided in the response, for example, MIME (Multipurpose Internet Mail Extensions) type, content data. Contains information about the overall size of the.
  • MIME Multipurpose Internet Mail Extensions
  • the browser launches the media player 110 which is an application connected to the mime type of the received response.
  • the media player 110 may be connected by an extension of a file other than the mime type.
  • a request generated by the URL or a communication protocol written accordingly for example, an HTTP request or an RTSP / RTP request, is sent to the started media player 110. Pass as a call argument.
  • the media player 110 may be directly received or selected through a user UI.
  • the data transmission / reception unit 112 is notified of the URL directly received or selected, or a request according to the communication protocol.
  • the reception control unit 113 allocates the reception buffer 113a and the transmission buffer 113b to the memory 7 and allocates each of the allocated buffers 113a and 113b.
  • the information for accessing the data is shared between the media processing unit 111 and the data transmission / reception unit 112. Then, the data transmission / reception unit 112 is notified to the data transmission / reception unit 112 previously transmitted at startup, and the data transmission / reception unit 112, as illustrated in FIG.
  • a request is made to create a new communication socket 22 while providing a request to the operating system 100a.
  • the request at this time may be for a wireless communication network to which the operating system 100a is currently connected for data service, or may designate a specific wireless communication network.
  • the data transmission / reception unit 112 refers to the network connection information returned by inquiring of the operating system 100a.
  • the network access information includes a connection IP address and a connection type (for example, 3G mobile telephone network, Wi-Fi wireless LAN network, etc.) when connected to a wireless communication network. You can request the creation of a communication socket by specifying the connection type or by specifying the associated IP address.
  • the operating system 100a is based on the information (for example, protocol information described in the request, the name or IP address of a host field, etc.) described in the request according to the received communication protocol, and the content as the destination of the information.
  • a TCP connection is established with the server 12.
  • the operating system 100a returns the identifier of the generated communication socket 22 to the data transceiver 112 in response to the communication socket creation request.
  • the data transmission / reception unit 112 identifies the type of communication network used by the communication socket (eg, 3G mobile telephone communication network, Wi-Fi wireless LAN network, etc.). After notifying the reception control unit 113, through the communication socket 22 specified by the returned identifier, the request of the communication protocol notified before is sent back to the content server 12, and the browser Receives the response received through the newly created communication socket 22.
  • the request document created according to the HTTP syntax for a URL such as “http://vod.airplug.com/video/movieABC.mp4”. The request is stored separately in association with the communication socket 22 that transmitted the request.
  • the request document may also be provided for the reception control unit 113 to refer to the data reception control operation described below.
  • the browser transmits a request based on a communication protocol for stopping transmission of the response data through the communication socket 21 1 at which the response data is being received, or at the same time as the start request of the media player 110. It is also possible to close the socket 21 1 .
  • the data transmission / reception unit 112 reads response data received through the newly created communication socket 22 and interprets the data based on a communication protocol, for example, HTTP or RTSP / RTP, and then streams the response data.
  • a communication protocol for example, HTTP or RTSP / RTP
  • Data of the media file is moved to the receiving buffer 113a in order.
  • the metadata for the content data is extracted from the response and stored separately for later use and transmitted to the reception controller 113 at the same time.
  • the meta data includes media information extracted from the head of the media file data, in addition to the above-described file description information provided according to a protocol format for media file transmission. This media information includes content reproduction time information.
  • the media processing unit 111 draws out the media data accumulated in the reception buffer 113a in order as described above, determines the decoding method based on the encoding information of the data recorded in the header of the data, and then determines the decoding method. Decode the media data partially or completely according to the decoding scheme. In case of partial decoding, the determined decoding scheme is also set in the decoder 110a.
  • the partial decoding may be, for example, extraction of media packets on a block basis, picture basis, or GoP (Group of Pictures) basis.
  • the decoded media packets are applied to the decoder 110a to request decoding so that the video and audio signals thereof are output.
  • the image data completely decoded by the media processing unit 111 is applied to the display driver 4 through the operating system 100a and output as an image signal.
  • the reception control unit 113 maintains only the load applied to the currently used communication network according to the use of the data service as necessary, and there is a possibility that a failure or inconvenience in using the user's data service may be caused. Only the data reception control method illustrated in FIGS. 4 and 5 is performed to increase the resource usage of the communication network. In order to perform this control method, the reception control unit 113 sets restriction information in the data transmission / reception unit 112 (S301).
  • the restriction information is information for specifying a rule for data buffering, and the rule includes whether to limit buffering or a reference value for limiting buffering, that is, a buffering limit value.
  • the reception control unit 113 allows different buffering rules, that is, buffering limits of different sizes, to be set according to the type of the wireless communication network used by the communication socket 22.
  • the limit for the cellular network 11a is set to, for example, 1/2 or 1/3 of the limit for the Wi-Fi network 11b.
  • the same size limit may be specified for different networks, but in embodiments according to the invention, different sizes of at least two different networks may be employed.
  • the limit value is specified. When the value of the buffering limit decreases, the amount of data buffering also decreases.
  • the reason for making the limit for the cellular network 11a smaller than that for the Wi-Fi network 11b is that the cellular network 11a Compared to the Wi-Fi network 11b, the service characteristics are relatively less volatile and have a wider service area. Therefore, despite the small amount of buffering, the buffer underrun (in this case, there is no data to be decoded, This is because the probability of occurrence) is quite low.
  • the buffering limit value by the restriction information to be set by the reception control unit 113 is basically determined as the time length, when setting the determined value to the data transmission / reception unit 112, it is not set as the determined time length but as the data amount. Can also be set. In the case of setting the data amount, the total size and the playback time of the corresponding content are grasped from the meta data transmitted from the data transmitting / receiving unit 112 to set the data amount corresponding to the time length of the limit value to be set. .
  • the data amount ThRef_S of the limit value to be set is determined by the following equation [1].
  • ThRef_S ThRef_T * (file_D / P_TIME) expression [1]
  • Equation [1] is equally applied when the data transceiver 112 determines the amount of data corresponding to the time length, when the limit value is set in the data transceiver 112 as a time length.
  • the corresponding time length Arb_DataT is obtained by using the arbitrary data amount Arb_DataS using the following equation [2]. It can also be used to compare with the set limit in terms of.
  • Arb_DataT Arb_DataS * (P_TIME / file_D) Expression [2]
  • the limit value determined and set according to the type of the use network is set to the current communication state or data use state ( In the following, it is abbreviated as " communication status / use status " For example, if the communication state of the service area of the currently connected wireless communication network is highly volatile, the reception control unit 113 changes the buffering limit value to a larger value and resets the data transmission / reception unit 112. .
  • the set limit is adjusted to be smaller to reset the data transmission / reception unit 112.
  • the initial limit value for the type of wireless communication network it may be adjusted and set to a limit of a size smaller than the limit for the corresponding wireless communication network in consideration of the data service usage amount.
  • adjusting the buffering limit to a smaller value increases the likelihood that exhaustion of buffered data (buffer underrun) occurs, which is the case for all wireless communication terminals running the media player 110. In some cases, some of the users stop playing the content, so that the load on the wireless communication network can be reduced.
  • the data transmission / reception unit ( 112 continuously reads (52a) the data blocks 51 reaching the communication socket 22 such that the buffering value of the receiving buffer 113a becomes the limit value as illustrated in FIG.
  • the receiving buffer 113a is filled in order (52b) (SS33).
  • the operating system 100a immediately connects the cellular modem 1a and the It is filled with media data received through the cellular codec 1b.
  • the operating system 100a receives data and fills the communication socket 22 only by being moved to the reception buffer 113a and emptied by the data transmission / reception unit 112, the cellular network 11a
  • the data transfer rate between the media player 110 and the content server 12 through the convergence to the required speed of the content, and the buffering value of the media data maintained by the media player 110 is set on average. It stays below the limit. Therefore, even if the execution of the media player 110 is interrupted during the play by the user's request or the like, the amount of data unnecessarily received by the media player 110 (the image based on the data amount is visually or audible to the user. The term "unnecessary" is used because it is not expressed.
  • the load on the wireless communication network to be used is statistically reduced as compared with the case of buffering and playing larger.
  • the reception control unit 113 corresponds to a time for which there is a considerable margin, for example, about 10 seconds, for a time that is more than an estimated time for the connection switching. Restriction information having a limit value increased to a value is set to the data transceiver 112 (S311). At this time, the data transmission / reception unit 112 is also notified about the switching value described below.
  • the emergency value hereinafter referred to as "emergency limit value”
  • the emergency value which is a limit value included in the restriction information, has a value larger than the limit adjusted by the communication status / use status as described in the above embodiments. .
  • the emergency limit value is preferably larger than a buffering value (hereinafter, referred to as a "switch value" for this value) which the reception control section 113 determines to perform connection switching. It may have the same value as the conversion value. In the latter case, separate terms (emergency limits, conversion values) are used for the detailed description of the invention. However, in the actual implementation of the invention, a single designated value is used to increase the buffering value as described below. A conversion decision is made. The conversion value is usually a little more than the time that is expected to be spent by the connection switching (for example, 3 seconds for the switch to the Wi-Fi network, 5 seconds for the switch to the cellular network), for example, about 3 seconds.
  • the conversion value may be assigned a different value according to the type of connection conversion to be performed (for example, switching to a cellular network, switching to a Wi-Fi network, or switching to an AP in a Wi-Fi network).
  • the emergency limit value may be designated as a single value regardless of the type of the connection switching, but may be specified differently according to the type of the wireless communication network to which the connection is to be switched.
  • the reception controller 113 may transmit the data even if the current state corresponds to a connection switching precondition.
  • the operation of setting the emergency limit value in the transceiver 112 is not performed.
  • the data transmission / reception unit 112 may be notified of the switching value designated according to the connection switching type.
  • a limit value initially specified for a specific wireless communication network for example, the Wi-Fi network 11b, may have a value larger than each conversion value specified according to a connection switching type. Even in this case, the reception control unit 113 does not set the emergency limit value.
  • the switching value can also be notified at this time.
  • the data transmission / reception unit 112 performs a reception control operation according to the emergency limit value as described above, and repeatedly performs the operation illustrated in FIG. 5. At the same time as S312, it is checked whether the buffering value of the reception buffer 113a exceeds the notified change value (S313).
  • the target base station When the network switching command is received through the switching center, the target base station inserts the command into an appropriate position in the radio signal format and wirelessly transmits the command. Then, it is decoded by the cellular codec 1b of the mobile stations including the radio communication terminal 100 located in the cell of the base station and provided to the operating system 100a. Instead of the periodic confirmation, the reception control unit 113 registers with the operating system 100a to generate an event to itself when the network switching command is received. It may be confirmed that the received by (100).
  • the reception control unit 113 receives a network switching command from the outside, the limit value is increased to the emergency limit value as described above, and is reset to the data transmission / reception unit 112 as described above.
  • the data transmission / reception unit 112 is notified of a switch type, that is, a designated switch value corresponding to the switch to the Wi-Fi network 11b.
  • the access network switching operation according to the received network switching command is performed (S314). This will be described later in detail.
  • an execution object for example, an application or a process, which receives the network switching command from the outside in the same manner as described above and performs the network switching accordingly, the media player 110. And can be executed separately.
  • the media player 110 when the execution object receives the network switch command and performs an access network switch operation, the media player 110 notifies the media player 110 that the network switch command has been received.
  • notification may be made through a structured information unit, for example, an intent object, configured in accordance with an information format defined by the operating system 100a for exchanging information / commands between processes. .
  • the media player 110 notifies the reception control unit 113 of the notification of the switching of the access network.
  • the reception control unit 113 is notified of the switching fact from the execution object in the same manner as described above with respect to the access network switching.
  • the switching fact may be notified from the operating system 100a.
  • the reception control unit 113 is notified of the fact that the network is switched, because the media data that is received via the currently connected wireless communication network, even if the use network is switched so that the media data is continuously received continuously To perform the operation. This will be described later.
  • the connection switching precondition checked by the reception control unit 113 may correspond to a connection switching request to another wireless communication network, for example, the Wi-Fi network 11b.
  • this request is valid only if the Wi-Fi network 11b is currently accessible, otherwise it is considered that the request does not correspond to the connection switching precondition.
  • the reception control unit 113 requests and receives information on the Wi-Fi network state from the operating system 100a.
  • the operating system 100a controls the Wi-Fi modem 2a to physically search the Wi-Fi signal band for this request, after which the Wi-Fi modem 2a is the corresponding signal band. Reads identification information of each access point and a value of a received signal strength indicator (RSSI), etc. (r11 in FIG.
  • RSSI received signal strength indicator
  • the reception control unit 113 determines that the current Wi-Fi network is not accessible. In addition, even when there is an access point, it may be determined that the connection is not possible even when there is no connection point for receiving a signal having a predetermined predetermined strength or more. In this case, the reception control unit 113 may notify the data transmission / reception unit 112 differently from each other according to the type of access point to which the connection is possible. For example, if an access point that is currently identified as accessible is of a type that has an authentication procedure, it will be notified by specifying a larger value than the type that does not exist.
  • the estimated connection time is about 3 seconds, and if the type has an authentication procedure, the estimated time is about 10 seconds. You can decide. Of course, if there is a previous connection and the types of connection points that can be connected are mixed, a long time conversion value is determined and used.
  • the reception control unit 113 is a request for switching to a Wi-Fi network, for example, a request notified from another execution object, or a communication environment setting provided by the main control unit 10 on the display panel 5.
  • a request from a user through a menu, an icon, or the like, or a request through a button or the like provided by the media player 110 on the display panel 5 the Wi-Fi is currently described as described above. It is checked whether the network 11b is connectable, and if it is in a connectable state, the limit value is increased as described above and the data transmission / reception unit 112 is set and notified as described above.
  • connection switching preconditions checked by the reception controller 113 may also correspond to the wireless communication terminal 100 being in a mobility state.
  • the reason why the mobility state is regarded as the connection switching precondition is that the connection IP address may be changed and assigned in the wireless communication network which is currently connected with the movement.
  • the wireless communication terminal 100 is in a mobile state is determined, if the GPS module is provided in the wireless communication terminal 100, by activating the GPS module and changing the position coordinates received therefrom. can do.
  • it may be determined from the change in signal strength with respect to any connection point of the Wi-Fi network 11b periodically checked through the operating system 100a. It may also be determined from the change of the service cell of the cellular network 11a identified through the operating system 100a.
  • the limit control unit may increase the emergency limit to the emergency limit and reset the data communication unit 112. Be prepared for a switchover. In this case, the reception control unit 113 may notify the data transmission / reception unit 112 as a switching value as a value designated for switching to the cellular network 11a.
  • the response includes a type (quality or bitrate, etc.) or an attribute (video or audio, etc.) belonging to the live media provided for the selected item.
  • Media index information as illustrated in FIG. 11, containing file list information for each of these different streams, is included, and the index information includes a list file containing file list information to be requested when each media component is selected.
  • URL information 701, 702, 703 is described as illustrated.
  • the communication protocol for the URL information of the list file according to the selected content is applied.
  • the media data of small size which is preferably acquired and stored (preferably, the media data may be obtained and stored through a predetermined access address when the media player 110 starts up).
  • Decode output This decoding output may be repeatedly performed on the media data until the new media data is stored in the reception buffer 113a after the subsequent transfer.
  • a connection type for the communication network is designated to request connection to the operating system 100a. If the Wi-Fi network 11b is connected, the access point currently searched for Selects the connection point having the highest signal strength and requests the operating system 100a to connect to the connection point. In response to this request, when the access network is changed to the cellular network 11a or the Wi-Fi network 11b and a successful conversion is notified from the operating system 100a (the other executing object performs the connection switching and then executes the execution). The same applies to the notification from the individual.) That is, when the connection IP address is changed due to the connection IP address being assigned from the connection intention network, the reception control unit 113 transmits to the data transmission / reception unit 112.
  • the content server 12 starts from N bytes through the switched wireless communication network, the Wi-Fi network 11b, or the cellular network 11a for the same content previously transmitted to the wireless communication terminal 100.
  • the media data is transmitted by the Wi-Fi modem 2a and the Wi-Fi codec 2b or the cellular modem 1a and the cellular codec 1b and then transmitted to the operating system 100a.
  • the newly created communication socket 23 is transmitted to the data transmission and reception unit 112.
  • the subsequent media data received is received by the data transmitting and receiving unit 112, and the previously received media data (the media data is extracted by the media processing unit 111 during the connection switching process.
  • the media processing unit 111 sequentially decodes the media data stored in the receiving buffer 113a without interruption or discontinuity even when the access IP address is reassigned or the communication network used is switched. By processing, seamless continuous video and audio can be provided to the user.
  • the status reporting agent 301 may be configured to indicate an internal IP address to monitor a request according to a communication protocol transmitted by the wireless communication terminal 300 and to check whether content data is received therefrom. By assigning an IP address, for example, "127.0.0.1” or "localhost” and a port number to the status reporting agent 301, and setting a proxy for the internal IP address, the status reporting agent 301 ) May relay the request / response according to the communication protocol.
  • an IP address for example, "127.0.0.1” or "localhost” and a port number
  • the status reporting agent 301 May relay the request / response according to the communication protocol.
  • the content server 200 even if the AV player 302 starts receiving the media data, the amount of buffering generated by delaying the start of play until the desired data buffering is required is buffering. It is not reflected in the value. If there is a report on the initial buffering amount from the AV player 302, the value of the buffering amount may be reflected as the initial value of the buffering value.
  • the content server 200 When the holding time T hd1 elapses, the content server 200 returns the adjustment coefficient to a pre-change value a c_i as illustrated in FIG. 15 to obtain a target speed and apply it to data transmission. . Accordingly, the AV player 302 plays the content data transmitted by the content server 200 while maintaining at least content data corresponding to the buffering limit.
  • the adjustment factor is changed according to the value of the information element, and the information element
  • the changed adjustment coefficient is maintained for a proper time so that the buffered value data corresponding to the value of ⁇ is buffered in the AV player 302.
  • the adjustment coefficient is changed to a value less than 1 or 0 (1101).
  • the time T decT of the amount (bufV dec ) to be reduced is maintained and then returned to the default value, for example 1 (1102).
  • the content server 200 in order to appropriately adjust the buffering value of the AV player 302 executed in the terminal as desired remotely, the content server 200, when there is a difference between the required speed and the transmission speed of the content currently being transmitted. By tracking the change in the buffering value during the time the difference is maintained, the current buffering value in the AV player 302 is always known. At this time, as described above, the value buffered by the AV player 302 through the delay of the start of play may be reflected in the initial value of the buffering value, so that the value may be always known.
  • ThRef2 is a value corresponding to the emergency limit described in the above embodiment. That is, when the content server 200 receives a notification that a connection changeover may occur in the wireless communication terminal 300, the content server 200 may have a buffering value sufficient to play for the time required for the switchover process. The data corresponding to) is buffered by increasing the transmission speed. The time for which data is transmitted to the wireless communication terminal 300 by the transmission rate increased by the conversion contrast value a c_Trans is until the wireless communication terminal 300 terminates the current connection for connection switching. to be. Therefore, it is preferable that the holding time T hd2 of the conversion contrast value a c_Trans (that is, the target speed thereby) be as short as possible to be terminated before termination. Further, preferably, the holding time T hd2 of the conversion contrast value a c_Trans is shorter than the holding time T hd1 of the adjustment coefficient value by another information element.
  • the conversion contrast value a c_Trans may be maintained for a significant time, for example 1 minute or 2 minutes, until the connection is terminated (1011). This is because, if the connection switching preconditions are met, the possibility of a subsequent connection switching and reconnection using a new local IP address is very high. Therefore, the transmission speed increased by the value of the switching ratio is terminated by the current session. Because it will stop at the moment. Of course, if the current session is not terminated within the significant time, then after that significant time the adjustment factor is returned to the default value.
  • the content server 200 receives information for communication network selection or access point selection of other management servers, for example, wireless communication terminals. It provides the received unique information to the access control server providing the.
  • the access control server is information to be referred to when the wireless communication terminal selects one communication network among the plurality of heterogeneous networks 11a and 11b or to select one connectable access point of the Wi-Fi network 11b.
  • receiving the unique information of the terminal and the identification information of the service area in which the terminal is located from any wireless communication terminal that requires the selection of the communication network or the selection of the access point is mutually Since it manages in association, when the terminal unique information is received from the content server 200, as a response, identification information of the service area stored in association with the unique information is provided.
  • the content server 200 acquires the information of the communication state of the service area as described above, and based on the obtained information, the adjustment as described above. By changing the coefficient, the transmission speed is maintained for a certain time.
  • the content server 200 when the latter information is received in the form of a subscriber's telephone number of the terminal, the content server 200 provides the received subscriber's telephone number to another management server, for example, a subscriber information operation server.
  • the subscriber requests and obtains a data service usage amount through a specific communication network, for example, the cellular network 11a.
  • the content server 200 changes the adjustment coefficient (for example, the constant of the adjustment coefficient for increasing the buffering value according to the network type check). In order to reduce the buffering value increased by the change over time), as shown in FIG. 16, the adjustment coefficient is maintained for less than 1 time as much as the buffering value is to be reduced.
  • the network switching command may be directly received from the load control server to which the content server 200 transmits the corresponding command.
  • the load control server transmits or before transmitting a network switching command for an arbitrary service area
  • the server (the content server 200 corresponds to such a server) is promised mutual information provision.
  • Identification information of the area is provided as emergency control information.
  • the content server 200 receives the emergency control information, the content server 200 confirms whether identification information of each service area identified for wireless communication terminals providing content data is the same as identification information included in the emergency control information. If there is the same identification information, the wireless communication terminal, as described above, is changed to a conversion contrast value a c_Trans to be maintained for a predetermined time or until the connected session is terminated.
  • the content server 200 increases the content data in order to increase the buffering value when the connection server preconditions and the like correspond to the wireless communication terminal 300 providing the content data. Increased transmission speed of (1001,1003).
  • the data rate actually increased by the content server 200 may not be supported by traffic or communication conditions on the data path, so that a buffering value as much as desired may not be secured in the wireless communication terminal 300. have.
  • the content server 200 continuously monitors the actual delivery speed of the content data that it provides to the wireless communication terminal 300. 17 shows an example of this.
  • the transmission of the content data is performed by transferring a data block 1200 n of any size and delivering the next data block 1200 n + 1 of any size after a suitable time has passed after the content block has been transmitted.
  • the transmission speed and the monitored support rate that the mobile station should increase should be increased.
  • the content server 200 does not change the current transmission rate as illustrated in FIG. 18 (1301).
  • the size of the data buffered in the AV player 302 remains unchanged on average (1322). How much lower the quality of the content is, the required speed required for the content, the support speed on the currently known transmission path, the buffering value to increase, and the connection switching preconditions until the actual connection switching is performed. It is determined by considering the statistically expected time.
  • the position of the data to be transmitted of the changed content is a position where the content following the content of the last content data previously transmitted starts. If the content that was being transmitted was live content, as in the above embodiment, the data of the first content piece of the list file is transmitted together with the list file for the lower quality component or the component of another attribute.
  • the transmission rate is changed to a lower quality content. It may increase to within the supported range (1302).
  • the content server 200 controls the data transmission rate so that the data buffering value in any wireless communication terminal is adjusted to meet a given condition.
  • the adjustment of the amount of data buffering is made by an application's own algorithm, such as an AV player running on any wireless communication terminal, and the content server 200 considers adjusting the buffering value.
  • the data transmission speed of the requested content may be controlled.
  • the transmission rate of the requested content is based on the required speed of the content according to the identified type. Decide on For example, as illustrated in FIG.
  • the transmission rate is determined by k 2 times (for example, 1.5 times) (preferably, k 2 is greater than k 1 ) of the required speed (1412). do.
  • the transmission speed for the Wi-Fi network 11b may be designated as a speed higher than the conversion contrast rate described below.
  • the amount of data buffering in the AV player or the like of any wireless communication terminal that receives the data is higher than the play speed PlySd.
  • the surplus rate ⁇ (k 1 -1) * PlySpd or (k 2 -1) * PlySpd ⁇ increases.
  • the content server 200 stops transmitting the content and receives a re-request for the content.
  • the transmission rate is determined based on the required speed of the content and applied to the transmission of the content.
  • the content server 200 described in the above embodiments may include a communication processor 200a, an information processor 200b, and a content storage unit 200c.
  • the content server 200 may be composed of a single computing device or a plurality of computing devices that are independent of each other. If each of the components is built as a separate computing device, for example, a server (server), they are interconnected by a leased line or a dedicated network and the mutual communication is made under an appropriate network security communication protocol.
  • a server server
  • Each of the components illustrated in FIG. 20, that is, the communication processing unit 200a, the information processing unit 200b, and the content storage unit 200c performs the aforementioned operations performed by the content server 200 in various embodiments. They will work together.
  • the information processing unit 200b analyzes the request according to the communication protocol received from the communication processing unit 200a, searches for and finds the data or information necessary for the response in the content storage unit 200c, and then finds the data.
  • the response document is constructed using the information, and the response document is provided to the wireless communication terminal that has transmitted the request through the communication processing unit 200a. If the response provided is media data of the content, as described above, the transmission rate control operation of the media data is performed.
  • the above-mentioned information elements required in this process are transmitted through the communication processing unit 200a from an entity (for example, the status reporting agent, an AV player, etc.) executed in the corresponding terminal or from another management server. It is used for adaptive speed determination of data.
  • each of the components 200a, 200b, and 200c of the content server 200 configured as illustrated in FIG. 20 is only for basic matters in the concept and spirit of the present invention.
  • the operation of each of the components 200a, 200b, and 200c is not limited to the above description, and each of the components 200a, 200b, and 200c may be the content server according to the various embodiments described above.
  • the operation of 200 (for example, changing the quality of content to be transmitted) is distributed and performed in a form corresponding to each allocated function.
  • operations of the components 200a, 200b, and 200c are not limited to those described with reference to FIG. 20, and parts of the operations of the content server 200 described in the above-described various embodiments. Of course it is extended to.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention porte sur un terminal de communication sans fil qui reçoit des données multimédias par mise en tampon des données au-dessous d'une valeur limitée désignée pour un réseau de communication sans fil connecté. Le terminal de communication sans fil change la valeur limitée en une plus grande valeur d'urgence avant de subir une conversion vers un autre réseau de communication sans fil, et permet aux données multimédias reçues au-dessous de la valeur limitée changée d'être mises en tampon. Des informations de limitation comprenant la valeur limitée désignée désignent différentes règles de mise en tampon pour au moins deux réseaux parmi une pluralité de réseaux de communication sans fil.
PCT/KR2013/004242 2012-05-29 2013-05-14 Procédé et appareil de réception de données à l'aide d'un minimum de ressources de réseau de communication sans fil et de conversion entre réseaux hétérogènes au moyen d'un terminal de communication sans fil WO2013180409A1 (fr)

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KR1020120056986A KR101358806B1 (ko) 2012-05-29 2012-05-29 무선통신 단말기가 무선 통신망의 자원을 최소 사용하여 데이터를 수신하면서 이종망간 전환할 수 있게 하는 방법 및 장치

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JP6591430B2 (ja) 2014-02-28 2019-10-16 サムスン エレクトロニクス カンパニー リミテッド 通信システムにおけるマルチメディアコンテンツ再生方法及び装置
WO2019031874A1 (fr) * 2017-08-09 2019-02-14 Samsung Electronics Co., Ltd. Procédé et système de traitement de gestion d'enregistrement et de session dans un système de communication sans fil

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KR20090043833A (ko) * 2007-10-30 2009-05-07 한국전자통신연구원 단말의 핸드오버를 대비한 스트리밍 데이터 버퍼링을지원하는 방법
KR20100078470A (ko) * 2008-12-30 2010-07-08 주식회사 케이티 무선 인터넷 환경에서의 스트리밍 콘텐츠 전송 방법
KR20120034550A (ko) * 2010-07-20 2012-04-12 한국전자통신연구원 스트리밍 컨텐츠 제공 장치 및 방법

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JP5064564B2 (ja) * 2008-08-28 2012-10-31 京セラ株式会社 無線端末及び通信端末

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KR20090043833A (ko) * 2007-10-30 2009-05-07 한국전자통신연구원 단말의 핸드오버를 대비한 스트리밍 데이터 버퍼링을지원하는 방법
KR20100078470A (ko) * 2008-12-30 2010-07-08 주식회사 케이티 무선 인터넷 환경에서의 스트리밍 콘텐츠 전송 방법
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