Abstract:
A universal plug and play (UPnP) network is provided. In the UPnP network, a QoS policy holder of a UPnP QoS architecture manages information on QoS modes that are previously set, and a QoS manager controls QoS devices by importing traffic policies for a predetermined QoS mode from the QoS policy holder. Accordingly, a user can suitably control traffic items in the network only by selecting a desirable QoS mode according to situations.

Description:
CROSS-REFERENCE TO RELATED PATENT APPLICATION 
     This application claims the benefit of Korean Patent Application No. 10-2007-0084523, filed on Aug. 22, 2007, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a home network, and more particularly, to a method of controlling Quality of Service (QoS) of a service provided by devices in a universal plug and play (UPnP) network. 
     2. Description of the Related Art 
     Universal plug and play (UPnP) is a protocol capable of finding and controlling electric appliances connected to a network. UPnP is used as a standard technique of home networking. 
     The UPnP QoS architecture is a standard for securing QoS for services in the network by controlling traffic communicated among a plurality of devices in the UPnP network. Services such as QoS device services, QoS policy holder services, QoS manager services, and the like are defined in the UPnP QoS architecture. The UPnP QoS architecture is used to use multimedia contents such as audio and video through a network. 
       FIG. 1A  illustrates a UPnP network constructed with a device for providing a QoS device service (hereinafter, referred to as a QoS device), a device for providing a QoS policy holder service (hereinafter, referred to as a policy holder), and a device for providing a QoS manager service (hereinafter, referred to as a QoS manager). A user previously sets and stores a traffic policy (for example, priority) in a network in the policy holder. When a control point requests QoS for predetermined traffic to be secured, the QoS manager constructs a traffic descriptor by receiving traffic policy information and controls traffic of the QoS devices by using the traffic descriptor. 
       FIG. 1   b  is a flow diagram for illustrating a procedure in which UPnP QoS architecture elements communicate with one another. 
     The control point transmits information on traffic to which QoS is to be applied to the QoS manager by calling an action of RequestTrafficQos( ) of the QoS manager service. The transmitted information may include types of source devices, sink devices, and traffic. 
     The QoS manager acquires a traffic policy by calling an action of GetTrafficPolicy( ) defined in the QoS policy holder service based on the transmitted information. The traffic policy indicates information for controlling QoS for the traffic such as an admission policy, a traffic importance number, a user importance number, and the like. Since a detailed description of information constituting traffic elements is included in UPnP QoS architecture document, a detailed description thereof will be omitted. On the other hand, the QoS manager calls the actions of GetPathInformation( ), GetQoSDeviceInformation( ), and GetQoSState( ) defined in the QoS device service so as to recognize a path of the traffic and capability of devices located on the path of the traffic. 
     Finally, the QoS manager controls traffic of the QoS devices by calling an action of SetupTrafficQos( ) of the QoS device services based on the gathered information. 
     In the existing technique, since a traffic policy has to be set, there is a problem in that it is impossible to flexibly control the traffic of the network for different situations and different users. For example, when a user sets a priority level of video traffic transmitted from a media server located at an upstairs room to a television (TV) in a living room to the highest priority level, the video traffic has the highest priority level regardless of the situation, if a traffic policy for the video traffic is not changed. However, as an example, QoS of video traffic of a drama transmitted from a set-top box in the living room to a kitchen has to be previously set to coincide with a time for preparing a dinner. In a case where an urgent report has to be printed, data traffic transmitted to a printer is most important for the user. The existing technique is inconvenient because traffic policies have to be changed in the aforementioned cases. 
     SUMMARY OF THE INVENTION 
     The present invention provides a method and apparatus for flexibly controlling traffic of a QoS manager service in a network based on various QoS modes that are previously set by a user. 
     According to an aspect of the present invention, there is provided a method of allowing a universal plug and play (UPnP) device to provide a Quality of Service (QoS) manager service, the method comprising: receiving a QoS request based on a QoS mode from a control point; acquiring traffic policies that are previously set for a plurality of traffic items for the QoS mode from a QoS policy holder service; and controlling a plurality of QoS device services of the network based on the acquired traffic polices. 
     The receiving of the QoS request may comprise receiving a message for calling a predetermined action of the QoS manager service by using an identifier for representing the QoS mode as an input parameter from the control point, and the acquiring of the traffic policies may comprise: calling a predetermined action of the QoS policy holder service by using the identifier as an input parameter; and receiving traffic policies that are previously set for the QoS mode as an output parameter for the calling. 
     According to another aspect of the present invention, there is provided a computer-readable medium having embodied thereon a computer program for executing the method above. 
     According to another aspect of the present invention, there is provided an device for providing a Quality of Service (QoS) manager service in a universal plug and play (UPnP) network, the device comprising: a QoS request receiver receiving a QoS request based on a QoS mode from a control point; a traffic policy acquirer acquiring traffic policies that are previously set for a plurality of traffic items for the QoS mode from a QoS policy holder service; and a QoS controller controlling a plurality of QoS device services of the network based on the acquired traffic polices. 
     The QoS request receiver may receive a message for calling a predetermined action of the QoS manager service by using an identifier for representing the QoS mode as an input parameter from the control point, and the traffic policy acquirer may call a predetermined action of the QoS policy holder service by using the identifier as an input parameter and receives traffic polices that are previously set for the QoS mode as an output parameter, in response to the calling. 
     According to another aspect of the present invention, there is provided a method of providing a Quality of Service (QoS) policy holder service in a universal plug and play (UPnP) network, the method comprising: receiving a request for traffic policies that are previously set for a QoS mode from a device for providing a QoS manager service; and transmitting traffic polices that are previously set for a plurality of traffic items for the QoS mode to the device. 
     The receiving of the request may include receiving a message for calling a predetermined action of the QoS policy holder service by using an identifier for representing the QoS mode as an input parameter from the device. 
     The method may further comprise: receiving a message for calling a predetermined action of the QoS policy holder service from a control point; and providing information on at least one selected from the group consisting of QoS mode names of all the QoS modes managed by the QoS policy holder, sink and source devices of traffic items, and priorities of traffic items to the control point, in response to the calling. 
     The method may further comprise: receiving a message for calling a predetermined action defined in the QoS policy holder service; and editing information on at least one QoS mode managed by the QoS policy holder service based on input parameters included in the received message. 
     According to another aspect of the present invention, there is provided a computer-readable medium having embodied thereon a computer program for executing the method above. 
     According to another aspect of the present invention, there is provided an apparatus for providing a Quality of Service (QoS) policy holder service in a universal plug and play (UPnP) network, the apparatus comprising: a traffic policy request receiver receiving a request for traffic policies that are previously set for a QoS mode from a device for providing a QoS manager service; and a traffic policy provider transmitting traffic policies that are previously set for a plurality of traffic items for the QoS mode to the device. 
     The traffic policy request receiver may receive a message for calling a predetermined action of the QoS policy holder service by using an identifier for representing the QoS mode as an input parameter from the device. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which: 
         FIGS. 1A and 1B  illustrate a procedure in which UPnP QoS architecture elements communicate with one another according to an existing technique; 
         FIG. 2  is a flowchart of a procedure in which a UPnP device provides a QoS manager service according to an embodiment of the present invention; 
         FIG. 3A  is a flowchart of a procedure in which a UPnP device provides a QoS policy holder service according to an embodiment of the present invention; 
         FIG. 3B  illustrates a screen in which information on QoS modes is displayed to a user according to an embodiment of the present invention; 
         FIG. 4  is a flowchart of a procedure in which UPnP QoS elements communicate with one another according to an embodiment of the present invention; and 
         FIG. 5  illustrates a structure of a device for providing a UPnP QoS manager service and a structure of a device for providing a UPnP QoS policy holder service. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. 
       FIG. 2  is a flowchart of a procedure in which a UPnP device provides a QoS manager service according to an embodiment of the present invention. 
     In operation  210 , a QoS manager receives a QoS request based on a predetermined QoS mode from a control point. This is a procedure in which the control point calls an action that is newly defined in the QoS manager service. At this time, an identifier of the QoS mode requested by the control point is used as an input parameter. 
     In operation  220 , in order to acquire traffic policies for the QoS mode, the QoS manager calls an action that is newly defined in a QoS policy holder service according to the embodiment of the present invention. At this time, the identifier of the QoS mode is also used as an input parameter. 
     In operation  230 , the QoS manager receives the traffic policies for the QoS mode from a QoS policy holder. 
     In operation  240 , the QoS manager controls QoS device services based on the received traffic polices. 
       FIG. 3A  is a flowchart of a procedure in which a UPnP device provides a QoS policy holder service according to an embodiment of the present invention. 
     In operation  310 , the QoS policy holder receives a message for requesting a browse of all the QoS modes managed by the QoS policy holder from the control point. This is a procedure in which the control point calls an action of the QoS policy holder service by using an identifier for the QoS mode as an input parameter. This action is newly defined in the QoS policy holder according to the embodiment of the present invention. 
     In operation  320 , the QoS policy holder provides mode information on all the QoS modes. At this time, the mode information includes all the traffic policies for each QoS mode. Accordingly, mode information includes QoS mode names for traffic, source and sink devices of traffic, priority of traffic, and the like. 
     A user can edit the mode information through a user interface while viewing the mode information.  FIG. 3B  illustrates an example of the mode information displayed to the user. Referring to  FIG. 3B , a priority level of traffic transmitted from a media server in a living room to a television (TV) in the living room is highest. 
     In operation  330 , when the user modifies and deletes mode information of at least one QoS mode or generates a new mode through a user interface, the QoS policy holder receives a message for requesting the mode information to be edited. An action used for this case is newly defined in the QoS policy holder according the embodiment of the present invention. 
     In operation  340 , the QoS policy holder edits the mode information of the QoS. That is, the mode information of the new QoS mode is generated, or the existing mode information is modified or deleted. 
     In operation  350 , the QoS policy holder receives a message for requesting traffic policies that are set in a predetermined QoS mode from the control point. This is a procedure in which the QoS manager calls an action that is newly defined in the QoS policy holder service according to the embodiment of the present invention so as to acquire the traffic policies for the QoS mode. 
     In operation  360 , the QoS policy holder provides traffic policies that are previously set for the QoS mode to the QoS manager. 
       FIG. 4  is a flowchart of a procedure in which UPnP QoS elements communicate with one another according to an embodiment of the present invention. 
     In operation  401 , the control point calls an action of BrowseQoSModes( ) of the QoS policy holder service so as to browse QoS modes that are currently set. 
     In operation  402 , the QoS policy holder returns mode information of all the QoS modes managed by the QoS policy holder. As described above, the mode information includes traffic policies for each QoS mode. 
     In operation  403 , the control point calls an action of EditQoSMode( ) of the QoS policy holder service so as to edit the mode information. 
     In operation  404 , the QoS policy holder generates a new QoS mode and mode information on the new QoS mode, or deletes or modifies the existing mode information, with reference to input parameters of the message that is received in operation  403 . 
     In operation  405 , the control point calls an action of RequestModeQoS( ) of the QoS manager service so as to set the traffic items of the network to a predetermined QoS mode. 
     In operation  406 , the QoS manager calls an action of GetModeTrafficPolicy( ) of the QoS policy holder service so as to acquire traffic policies of the requested QoS mode. 
     In operation  407 , the QoS policy holder returns the traffic policies that are set for the QoS mode. 
     In operation  408 , the QoS manager controls QoS devices based on the traffic policies that are set for the QoS mode. 
     In the aforementioned procedures, BrowseQoSModes( ), EditQoSMode( ), RequestModeQoS( ), and GetModeTrafficPolicy( ) are newly defined actions according to the embodiment of the present invention. 
       FIG. 5  illustrates a structure of a device  500  for providing a QoS manager service and a structure of a device  550  for providing a QoS policy holder service in a UPnP network according to an embodiment of the present invention. 
     The QoS manager  500  includes a QoS request receiver  501 , a policy information acquirer  502 , and a QoS controller  503 . The QoS request receiver  501  receives a request for controlling traffic based on a predetermined QoS mode from a control point  510 . At this time, an identifier for the QoS mode is input. 
     The traffic policy acquirer  502  imports the traffic policies that are previously set for the QoS mode from the QoS policy holder  550  by using the identifier. 
     The QoS controller  503  controls traffic of a UPnP network by controlling QoS device services  520  based on the traffic policies transmitted from the traffic policy acquirer  502 . 
     The QoS policy holder  550  includes a traffic policy request receiver  551 , a traffic policy provider  552 , a storage unit  555 , a mode information provider  553 , and a mode information editor  554 . 
     The traffic policy request receiver  551  receives a request for traffic policies for a predetermined QoS mode from the QoS manager  500 . At this time, an identifier for the QoS mode is received as an input parameter. 
     The traffic policy provider  552  reads mode information of the QoS mode from the storage unit  555  in which information on traffic policies is stored by using the identifier. As described above, the mode information includes traffic policies of the QoS mode. 
     On the other hand, a user can browse mode information for all the QoS modes that are previously set by using any control point  530  in a UPnP network. The mode information provider  553  provides mode information stored in the storage unit  555  to the control point  530 , in response to a request from the control point  530 . 
     In addition, the user can edit the mode information stored in the storage unit  555  by using any control point  530  in the UPnP network. At this time, in order to prevent non-authorized users from modifying mode information, an authentication procedure may have to be passed. The mode information provider  553  generates a new QoS mode, or modifies or deletes mode information of the QoS mode that is previously set, in response to a request from the control point  530 . 
     The embodiments of the present invention can be written as computer programs and can be implemented in general-use digital computers that execute the programs using a computer readable recording medium. 
     Examples of the computer readable recording medium include magnetic storage media (e.g., ROM, floppy disks, hard disks, etc.), and optical recording media (e.g., CD-ROMs, or DVDs). 
     While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. The exemplary embodiments should be considered in descriptive sense only and not for purposes of limitation. Therefore, the scope of the invention is defined not by the detailed description of the invention but by the appended claims, and all differences within the scope will be construed as being included in the present invention.