WO2012151983A1 - Système de terminal virtuel et procédé pour synchroniser de multiples services de flux dans un système de terminal virtuel - Google Patents

Système de terminal virtuel et procédé pour synchroniser de multiples services de flux dans un système de terminal virtuel Download PDF

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Publication number
WO2012151983A1
WO2012151983A1 PCT/CN2011/083814 CN2011083814W WO2012151983A1 WO 2012151983 A1 WO2012151983 A1 WO 2012151983A1 CN 2011083814 W CN2011083814 W CN 2011083814W WO 2012151983 A1 WO2012151983 A1 WO 2012151983A1
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Prior art keywords
synchronization
service flow
service
module
collaboration
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PCT/CN2011/083814
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English (en)
Chinese (zh)
Inventor
孙爱芳
高冲
凌志浩
袁宜峰
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中兴通讯股份有限公司
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Publication of WO2012151983A1 publication Critical patent/WO2012151983A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80—Responding to QoS

Definitions

  • the present invention relates to the field of communications, and in particular to a multi-stream service synchronization method in a virtual terminal system and a virtual terminal system.
  • a virtual terminal system is a distributed system that adaptively performs capability synthesis by aggregating devices in a surrounding environment and dynamically changing according to dynamic changes in environmental context information, thereby providing a rich service experience to users.
  • Each participating terminal synchronizes to obtain part of the service flow from the server and aggregates it in real time to the device that provides the presentation service to the user.
  • the collaborative work in the system itself needs time synchronization between the nodes, so the time synchronization mechanism is the distributed system infrastructure framework.
  • a key mechanism is the distributed system infrastructure framework.
  • a plurality of terminal devices participating in the collaboration need to complete the transmission of the service through a certain synchronization mechanism.
  • the virtual terminal system based on multi-terminal cooperation faces a more complex terminal environment and network environment, and the network connecting the terminals of the virtual terminal system may have differences in bandwidth, delay and bit error rate. This has a great impact on the synchronization problem of collaborative communication.
  • the diversity of ubiquitous network applications has led to the diversity of requirements for time synchronization mechanisms. A time synchronization mechanism cannot meet all application requirements.
  • the present invention provides a multi-stream service synchronization method in a virtual terminal system and a virtual terminal system, so as to at least solve the problem that the time synchronization mechanism in the related art cannot meet the diversity requirement of the ubiquitous network for the time synchronization mechanism.
  • a virtual terminal system includes: a master control device and a collaboration device, where the collaboration device includes: a first service flow receiving module, configured to receive a service flow from the server; The sending module is configured to send the service flow received by the first service flow receiving module to the main control device, where the service flow carries control message information; the main control device includes: a second service flow receiving module, configured to receive from the collaboration device a service flow, configured to store the service flow received by the second service flow receiving module to the packet data buffer; and a synchronization mode selection module configured to select a synchronization mode according to the type of the service flow, The synchronization mode includes precise synchronization and event synchronization.
  • the synchronization module is configured to synchronize the service flow in the packet data buffer according to the control message information and the synchronization mode selected by the synchronization mode selection module.
  • the collaboration device further includes: a test module, configured to exchange test packets with the master device, and determine a link state with the master device; the master control device further includes: a test response module, configured to respond to the test sent by the collaboration device A message that determines the link status with the collaboration device.
  • the test module includes: a synchronization control message sending unit, configured to send a synchronization control message to the main control device, where the synchronization control message carries a timestamp and a sequence number; the test analysis unit is set to return to the main control device.
  • the test response module includes: a timing information reconstruction unit, configured to receive the synchronization control message, and reconstruct the cooperative device according to the timestamp and the sequence number The generated timing information; the receiving report generating unit is configured to estimate the number of lost packets according to the received synchronization control message, and generate a receiving report, where the receiving report includes packet loss and packet delay jitter information; Configured to transmit a reception report to the cooperating devices.
  • the synchronization mode selection module includes: a first selection unit, configured to: when the service flow is a real-time service, select a synchronization mode of the service flow as a precise synchronization; and a second selection unit, when the service flow is a non-real-time service, select the service flow.
  • the synchronization mode is event synchronization.
  • the synchronization module includes: a clock determining unit configured to determine a time when the service flow is presented according to the timestamp and the sequence number in the control message information when the precise synchronization is adopted; the first presentation unit is set to the presentation time determined according to the clock determination unit Present the business flow.
  • the foregoing synchronization module may further include: a service flow location determining unit configured to determine, according to the timestamp and the sequence number in the control message information, the location of the service flow in the packet data buffer when the event synchronization is adopted; the second presentation unit, setting The traffic is presented for the location determined by the traffic flow location determining unit.
  • the method includes: the main control device receives a service flow from the cooperation device, where the service flow carries control message information; The control device stores the service flow to the packet data buffer; the main control device selects the synchronization mode according to the type of the service flow, wherein the synchronization mode includes precise synchronization and event synchronization; the main control device according to the control message information and the selected synchronization mode, The traffic in the packet data buffer is synchronized.
  • the method further includes: the master control device and the collaboration device exchange test packets to determine a link state with the collaboration device. The master control device and the collaboration device exchange test packets, and determine the link state between the collaboration device and the collaboration device.
  • the master control device receives the synchronization control packet sent by the collaboration device, where the synchronization control packet carries a timestamp and a sequence number.
  • the master control device reconstructs the timing information generated by the collaboration device according to the timestamp and the sequence number; the master device estimates the number of lost packets according to the received synchronization control message, and generates a reception report, where the reception report includes packet loss and packet Delay jitter information;
  • the master device sends a reception report to the collaboration device.
  • the method further includes: the collaboration device analyzing the received report returned by the master device, determining a statistical value of the packet loss, delay jitter, and round trip time of the test; The lost statistics, delay jitter, and round trip time determine the network state; the cooperative device adjusts the bandwidth, coding mode, and transmission interval of the traffic application according to the determined network state.
  • the synchronization of the service flow in the packet data buffer by the main control device includes: when the precise synchronization is adopted, the main control device determines the time when the service flow is presented according to the timestamp and the sequence number in the control packet information; The presentation time presents the service flow; when the event synchronization is adopted, the main control device determines the location of the service flow in the packet data buffer according to the timestamp and the sequence number in the control message information; the main control device presents the service flow according to the determined location.
  • the main control device synchronizes the service flows according to the type of the service flow, which can meet the synchronization requirements of different types of service flows, and solves the problem that the existing time synchronization mechanism cannot meet the diversity requirements of the ubiquitous network for the time synchronization mechanism.
  • the problem ensures real-time, efficient and orderly transmission of service flows, and enhances the user's QoS (Quality of Service) experience.
  • FIG. 1 is a structural block diagram of a virtual terminal system according to an embodiment of the present invention
  • FIG. 2 is a block diagram showing a specific structure of a virtual terminal system according to an embodiment of the present invention
  • FIG. 3 is a virtual terminal system according to an embodiment of the present invention. Another specific structural block diagram of the present invention.
  • FIG. 4 is a schematic structural diagram of a system for multi-stream service synchronization according to an embodiment of the present invention
  • 5 is a structural block diagram of a terminal device according to an embodiment of the present invention
  • FIG. 6 is a flowchart of a multi-stream service synchronization method in a virtual terminal system according to an embodiment of the present invention
  • FIG. 7 is a flow of services according to an embodiment of the present invention
  • the virtual terminal system in the embodiment of the present invention may include one or more terminal devices, where at least one master device (also referred to as a master device) provides a service presentation function to the user, and each service flow received. Perform a synchronization operation.
  • the master device may receive the service flow from the server side through multiple collaboration devices.
  • the server in the embodiment of the present invention may be a server on the operator side or a server on the service provider side.
  • the service offloading of the virtual terminal system requires a certain synchronization mechanism to ensure that the diversity of the ubiquitous network application leads to the diversity of the requirements of the time synchronization mechanism. It is impossible to satisfy all application requirements by using a time synchronization mechanism.
  • the embodiment of the invention provides a multi-stream service synchronization method in a virtual terminal system and a virtual terminal system.
  • the system and method are described in detail below.
  • the system includes: a collaboration device 10 and a master control device
  • the collaboration device 10 includes: a first service flow receiving module 12, configured to receive a service flow from the server; a service flow sending module 14, connected to the first service flow receiving module 12, configured to send to the main control device 20 The service flow received by the first service flow receiving module 12, wherein the service flow carries control message information (such as a timestamp and a sequence number of the service flow).
  • a service flow receiving module 12 configured to receive a service flow from the server
  • a service flow sending module 14 connected to the first service flow receiving module 12, configured to send to the main control device 20
  • the main control device 20 includes: a second service flow receiving module 22, configured to receive a service flow from the cooperation device; and a storage module 24, connected to the second service flow receiving module 22, configured to receive the second service flow receiving module 22
  • the service flow is stored in the packet data buffer;
  • the synchronization mode selection module 26 is connected to the storage module 24, and is configured to select a synchronization mode according to the type of the service flow, wherein the synchronization mode includes precise synchronization and event synchronization; the synchronization module 28, and the synchronization
  • the mode selection module 26 is connected to be configured to synchronize the service flows in the packet data buffer according to the control message information and the synchronization mode selected by the synchronization mode selection module 26.
  • the master device and the collaboration device in this embodiment transmit services between the server and the server in the form of a virtual terminal system.
  • the server side sends a service flow to the master device through multiple collaboration devices.
  • the server divides the service flow of one service into individual packet service flows, and delivers each packet service flow through multiple cooperative devices.
  • the server can provide a corresponding service flow to the master device according to the request of the user or the subscribed service.
  • the virtual terminal system of the present embodiment synchronizes the service flows according to the type of the service flow by the master control device, which can meet the synchronization requirements of different types of service flows, and solves the problem that the existing time synchronization mechanism cannot meet the ubiquitous network time synchronization mechanism.
  • the collaboration device 10 further includes: a test module.
  • the test device 20 is configured to perform a test packet with the master device 20 to determine the link state with the master device 20.
  • the master control device 20 further includes: a test response module 210, configured to respond to the test packet sent by the collaboration device, and determine The link status with the collaboration device.
  • the present embodiment in order to ensure the authenticity of the service flow presented on the master device, the present embodiment considers that the link state, the jitter, or the packet loss rate of each link are different.
  • the control device needs to perform the synchronization operation on the received service flow.
  • the embodiment can test the link state between the collaboration device and the master control device according to the set period.
  • the test module 16 includes: a synchronization control message sending unit 162, configured to send a synchronization control message to the main control device 20, where The synchronization control message carries a timestamp (system time) and a sequence number; the test analysis unit 164 is connected to the synchronization control message sending unit 162, and is configured to analyze the received report returned by the master device 20 to determine the test. Packet loss statistics, delay jitter, and round trip time; network state determination unit 166, coupled to test analysis unit 164, Set to determine the network status of the test based on the analysis of the analysis unit 164; parameter adjusting unit 168, to the network status determination unit 166 determines the adjustment of the bandwidth, coding scheme and transmission interval according to the network application service flow state.
  • a synchronization control message sending unit 162 configured to send a synchronization control message to the main control device 20, where The synchronization control message carries a timestamp (system time) and a sequence number
  • the test analysis unit 164 is connected to the synchronization control message
  • the test response module 210 includes: a timing information reconstruction unit 212 configured to receive the synchronization control message, and reconstruct the timing information generated by the cooperation device 10 according to the timestamp and the sequence number; the reception report generation unit 214, and the timing information reconstruction unit Connected to 212, configured to estimate the number of lost packets according to the received synchronization control message, and generate a reception report, where the reception report includes packet loss and packet delay jitter information; and the reception report sending unit 216 is connected to the reception report generation unit 214. Set to send a reception report to the collaboration device 10.
  • the synchronization mode selection module 26 includes: a first selection unit, connected to the storage module 24, configured to select a synchronization mode of the service flow as a precise synchronization when the service flow is a real-time service; a second selection unit, and storage
  • the synchronization mode of the selected service flow is event synchronization.
  • the synchronization module 28 of the embodiment may include: a clock determining unit, configured to determine the service according to the timestamp and the sequence number in the control message information when the precise synchronization is adopted.
  • the synchronization module 28 includes: a service flow location determining unit, configured to determine, according to the timestamp and the sequence number in the control message information, the location of the service flow in the packet data buffer when the event synchronization is adopted;
  • the second presentation unit is connected to the service flow location determining unit and configured to present the service flow according to the location determined by the traffic flow location determining unit.
  • the main control device After receiving the real-time service flow, the main control device determines the presentation time of the service flow in time, and according to the determined The time shows each real-time service flow; after receiving the non-real-time service flow, determining the order of the service flow and other service flows, and each non-real-time service flow is sequentially presented according to the determined positional relationship.
  • the terminal device that participates in the coordinated service transmission that is, the smart device, including but not limited to the mobile phone, has multiple interfaces, and can access the heterogeneous network through different modes. Referring to the system structure diagram of the multi-stream service synchronization shown in FIG. 4, the master control device and the plurality of collaboration devices (ie, the collaboration terminal 1, the . . . .
  • a system which is a distributed system that provides a rich business experience by aggregating devices in the surrounding environment and adaptively synthesizing capabilities based on dynamic changes in environmental context information. It includes more than one terminal device, wherein at least one master device is used to provide a service presentation to the user, and the master device is referred to as a master control device, and the plurality of collaboration terminal devices are responsible for the offloading and download transmission of the service, and the multiple coordinated terminal devices are The collaboration device for the master device.
  • the service required by the user is provided by the operator or the server of the service provider to download the link, and the service flow is allocated to the participating cooperative devices in the virtual terminal for service download according to certain rules, and the download service is transmitted to the main control device through the corresponding interface.
  • the master control device negotiates the transmission and synchronization control mechanism of the service flow through information interaction with the participating member devices.
  • the above-mentioned main control device and the cooperative device may be in addition to the basic component units in addition to the module division manners in the above-mentioned FIG. 1 to FIG. In addition, each module shown in FIG.
  • the service type analysis module 52 Set to analyze the type of business that the user applies for collaborative download, and pass the analysis result to the synchronization control module.
  • the service type analysis module 52 Set to analyze the type of business that the user applies for collaborative download, and pass the analysis result to the synchronization control module.
  • synchronization problems can be divided into two categories: One type of real-time services requires high real-time and accuracy of synchronization, such as continuous multimedia synchronization including one real-time continuous media stream or multiple real-time continuous Continuity synchronization relationship between media streams; Another type belongs to event synchronization, which needs to describe the sequence of occurrence of one or a group of related events or the synchronization relationship between corresponding actions.
  • the synchronization control module 54 is configured to implement different synchronization control strategies depending on the type of synchronization required for the service type.
  • the collaborative interaction module 56 is configured to interact with the collaboration device and the collaboration devices in the system, including synchronization control information and service flow information. Through the real-time and orderly interaction, the smooth development of collaborative work can be guaranteed.
  • the packet data buffering module 58 is configured to buffer packet data transmitted by each coordinated terminal through the synchronization control module.
  • the embodiment of the present invention further provides a multi-stream service synchronization method in a virtual terminal system. As shown in FIG.
  • Step S602 The main control device receives the service from the collaboration device. a flow, where the service flow carries control message information;
  • Step S604 The main control device stores the service flow to the packet data buffer;
  • Step S606 The main control device selects a synchronization mode according to the type of the service flow, where the synchronization mode includes Accurate synchronization and event synchronization;
  • Step S608 The main control device synchronizes the service flow in the packet data buffer according to the control message information and the selected synchronization mode.
  • the virtual terminal system of the present embodiment synchronizes the service flows according to the type of the service flow by the master control device, which can meet the synchronization requirements of different types of service flows, and solves the problem that the existing time synchronization mechanism cannot meet the ubiquitous network time synchronization mechanism.
  • the problem of diversity requirements ensures real-time, efficient and orderly transmission of traffic, and enhances the QoS experience of users.
  • the method further includes: the master control device and the collaboration device exchange test packets to determine a link state with the collaboration device.
  • the master control device and the collaboration device exchange test packets, and determine the link state between the collaboration device and the collaboration device.
  • the master control device receives the synchronization control packet sent by the collaboration device, where the synchronization control packet carries a timestamp and Sequence number; the master device reconstructs the timing information generated by the cooperation device according to the timestamp and the sequence number; The master control device estimates the number of lost packets according to the received synchronization control message, and generates a reception report, where the reception report includes packet loss and packet delay jitter information; the master device sends the reception report to the cooperation device.
  • the method further includes: the collaboration device analyzing the received report returned by the master device, determining a statistical value of the packet loss, delay jitter, and round trip time of the test.
  • the cooperative device determines the network state according to the statistical value of the packet loss, the delay jitter, and the round trip time; the cooperative device adjusts the bandwidth, coding mode, and transmission interval of the service flow application according to the determined network state.
  • the synchronization of the service flow in the packet data buffer by the main control device may include: when the precise synchronization is adopted, the main control device determines the time when the service flow is presented according to the timestamp and the sequence number in the control packet information; The presentation time presents the business flow.
  • event synchronization is adopted, the master device determines the location of the service flow in the packet data buffer according to the timestamp and the sequence number in the control message information; the master device presents the service flow according to the determined location.
  • Step S701 To complete the service download application of the user, the master control device aggregates the peripheral collaboration device to establish a virtual terminal system, and the server combines according to certain rules.
  • the network environment in which each collaboration terminal is located is configured to transmit a traffic flow to each coordinated terminal.
  • Step S702 The cooperative terminal sends a synchronization control packet to the master control device, where the packet header carries timing information (time stamp) and sequence number.
  • Step S703 The master device cooperative interaction module receives the synchronization control packet, and uses the timing information and the sequence number carried in the packet header to reconstruct the timing information generated by the sender (ie, the collaboration device), and performs the number of lost packets. It is estimated that the receiving report is delivered to the collaborative terminal through the collaborative interaction module. In this step, the receiving report includes calculating packet loss and packet delay jitter information, and each packet source of the service is separately implemented, and the timing reconstruction work is completed separately for each packet source.
  • Step S704 The cooperative terminal receives the foregoing receiving report, obtains network information through analysis, adjusts a service transmission bandwidth and an encoding manner according to the network information, and sends the service flow in an adjusted manner.
  • the cooperative terminal in this embodiment performs the following steps upon receiving the receiving report: 1) analyzing the received report, and calculating the statistical value of packet loss, delay jitter, and round trip time; 2) mapping the actual network state of each link Points (idle, saturated, congested) in order to take corresponding measures; 3) adjust the bandwidth, coding mode and transmission interval of the multimedia application according to the judgment of the network state analysis; 4) Send the service flow carrying the control message information.
  • Step S705 The collaborative interaction module of the master device receives the traffic flow from the coordinated terminal and stores the data packet to the packet data buffer module.
  • Step S706 The service type analysis module of the main control device analyzes the service applied by the user, and distinguishes the correlation between the service flows of each link.
  • step S707 For a weakly related service flow (that is, a non-real-time service flow), in an event synchronization manner, step S708 is performed.
  • a tight synchronization relationship between service flows for example, multimedia services need to be played in real time
  • multimedia information is transmitted through packets, the delay of each packet is different.
  • timing information needs to be transmitted so that the receiver can re-establish their timing relationships.
  • Step S707 Start the clock timing and complete the data packet synthesis for the service flow using the precise synchronization control.
  • Step S708 For the service flow synchronized by the event, determine the traffic flow correlation according to the sequence number, and synthesize the service flow.
  • the main control device determines the correlation and the sequence between the service flows by using the sequence number in the packet, and synthesizes the service flow.
  • this embodiment proposes a synchronous communication model of the virtual terminal system based on multi-terminal cooperation, and adopts a synchronization mechanism combining precise synchronization and event synchronization according to the difference of the transmitted service types, thereby solving the aggregation of the user equipment.
  • the device implements the synchronization control problem of each coordinated terminal device in the process of downloading the multi-stream service, thereby ensuring the implementation, efficient, and reliable transmission of the service, and providing the user with the best QoS experience.
  • This method has a good effect especially for audio and video synchronization of multimedia services.
  • the foregoing embodiment can ensure real-time, efficient, and orderly transmission of service flows by synchronous control in the process of multi-stream service transmission, especially for continuous multimedia streams with high real-time requirements, and further The user's best QoS experience provides sufficient protection.
  • modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

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  • Multimedia (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention porte sur un système de terminal virtuel et sur un procédé pour synchroniser de multiples services de flux dans le système de terminal virtuel. Le système comprend un dispositif maître et un dispositif de collaboration. Le dispositif de collaboration comprend : un premier module de réception de flux de services, utilisé pour recevoir un flux de services à partir d'un serveur ; un module d'envoi de flux de services, utilisé pour envoyer au dispositif maître le flux de services reçu, le flux de services portant des informations de paquet de commande. Le dispositif maître comprend : un second module de réception de flux de services, utilisé pour recevoir le flux de services ; un module de stockage, utilisé pour stocker le flux de services reçu dans un tampon de données de paquet ; un module de sélection de manière de synchronisation, utilisé pour sélectionner une manière de synchronisation selon le type de flux de services ; un module de synchronisation, utilisé pour synchroniser le flux de services dans le tampon de données de paquet conformément aux informations de paquet de commande et à la manière de synchronisation sélectionnée. La présente invention résout le problème de l'état antérieur de la technique selon lequel le mécanisme de synchronisation temporelle ne parvient pas à satisfaire les exigences du réseau ubiquitaire sur la diversité du mécanisme de synchronisation temporelle, et améliore les performances du système.
PCT/CN2011/083814 2011-09-23 2011-12-12 Système de terminal virtuel et procédé pour synchroniser de multiples services de flux dans un système de terminal virtuel WO2012151983A1 (fr)

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