COMMUNICATION SYSTEM, COMMUNICATION DEVICE, AND COMMUNICATION METHOD

TECHNICAL FIELD

The technology disclosed in the present specification relates to a communication system, a communication device, and a communication method that performs a content delivery service in accordance with DLNA standard or UPnP standard, and especially, relates to a communication system, a communication device, and a communication method that perform a delivery service of content to which information of ages, viewing by which is restricted, is added.

BACKGROUND ART

Recently, most of AV content has been digitalized, and a medium that records and reproduces digital content, such as a CD and a DVD, has been widely used. In addition, distribution/delivery services of content such as images and music through a network have become popular, and content delivery is performed between remote terminals through the network without transference of a medium such as a CD and a DVD. Further, Digital LivingNetwork Alliance (DLNA) has been standardized, in which audio-visual content digitalized based on universal plug and play (UPnP) that enables participation to the network by only connecting devices to the network is distributed at home through an Internet protocol (IP) network. With the fact above, products having functions complying with the DLNA standard and the UPnP standard have been increased in consumer electronics (CE) devices centering on audio-video equipment, and a personal computer (PC) and peripheral devices thereof.

In DLNA Guideline 1.0 (and 1.5) formulated several years ago, a connection condition of 2-Box Pull system (system usage) made of a digital media server (DMS) corresponding to a server that provides content and a digital media player (DMP) corresponding to a client that reproduces the content was defined. With the release of the guideline, products equipped with a DMS and a DMS function have been mainly spread. Further, in recently formulated DLNA Guideline 1.5, 3-Box System Usage has been defined, in which the client is made of a digital media renderer (DMR) and a digital media controller (DMC). The DMC is controlled, and content can be transmitted from the DMS to the DMR and can be reproduced. With the release of the guideline, products equipped with DMR and DMC functions have appeared.

The DMS can deliver content stored in the own storage either in the 2-Box Pull or in the 3-Box System Usage.

With spread of a broadband, services that deliver streaming of music and video content have been increased. Each of the devices (DMP, DMC, and DMR) does not directly receive content, and one device having the DMS function can receive the content, serving as a kind of proxy server, and deliver the content to other client devices. With such a utilization form, there is an advantage that the client devices such as a DMP, DMC, and DMR do not need a software module in which an authentication sequence for directly receiving the above services is incorporated, and hardware such as a tuner that receives broadcasting.

Meanwhile, there may be content including violent scenes or educationally unfavorable scenes among the pieces of content to be delivered. Therefore, a scheme is appropriately introduced, where information such as restriction for viewing based on age, recommended minimum age, or the like is attached to content, so that viewers of a certain age or less cannot view the content.

In a case of broadcasting content, in Association of Radio Industries and Businesses (ARIB) 10, for example, restricted age for viewing of a program can be indicated by inserting a predetermined descriptor “Parential rating descriptor” in an Event Information Table (EIT) that is program information.

For example, when a program, viewing of which is not allowed due to age restriction for viewing, is recorded, a user is asked to input a password and if the user fails in authentication, no sound and no image state is recorded, so that the program is kept away from a user of less than the restricted age for viewing. Further, a recording apparatus control system that cancels recording when a program, viewing of which is not allowed due to the age restriction for viewing, is attempted to be recorded has been proposed (for example, see Patent Document 1).

Further, a method has been proposed, in a network system configured from 2Box of a receiver and a recording reproduction apparatus, in which the recording reproduction apparatus that is a recording destination confirms whether control of reproduction of content is possible according to the age restriction for viewing when the content received by the receiver is recorded (for example, see Patent Document 2). According to the network system, any content received by the receiver provided with a DMS function can be reliably recorded.

Meanwhile, in a system configured from 3Box of a DMS, a DMC, and a DMR, when content received and recorded by the receiver provided with the DMS function is viewed with the DMR, reproduction control of the content according to the age restriction for viewing may not be properly performed. When the DMC is controlled and setting to the DMR is performed, the content is transmitted from the DMS to the DMR, and the reproduction/output is automatically started. However, since the DMC and the DMR do not necessarily exist in the same location, if the user fails to operate the DMC, unfavorable content may be output on an unexpected DMR (for example, on a DMR in a child's room).

CITATION LIST
Patent Document

Patent Document 1: Japanese Patent Application Laid-Open No. 2006-238278

Patent Document 2: Japanese Patent No. 4609506

SUMMARY OF THE INVENTION
Problems to be Solved by the Invention

An objective of the technology disclosed in the present specification is to provide a superior communication system, communication device, and communication method that favorably perform a delivery service of content to which information of ages, viewing by which is restricted, is added.

Another objective of the technology disclosed in the present specification is to provide a superior communication system, communication device, and communication method configured from 3Box of the DMS, DMC, and DMR, and capable of properly performing reproduction control of content according to the age restriction for viewing when the content on the DMS is reproduced with the DMR by operation from the DMC.

Solutions to Problems

The present disclosure is made in view of these problems, the technology according to claim 1 is a communication system including:

a server configured to provide content;

a reproduction apparatus configured to reproduce the content provided by the server; and a reproduction control apparatus configured to control reproduction of the content on the reproduction apparatus,

in which the reproduction control apparatus acquires a type of the content provided by the server and a type of content, viewing of which is allowed by the reproduction apparatus, and requests reproduction of content having the type, viewing of which is allowed by the reproduction apparatus to the reproduction apparatus.

Note that the “system” here refers to a logical set of a plurality of devices (or functional modules that realize specific functions), and whether the devices or functional modules are in a single housing is not particularly considered.

Further, the technology according to claim 2 of the present disclosure is a communication device including:

a browsing request unit configured to request browsing of detailed information of content from a server configured to provide the content;

a reproduction request unit configured to request reproduction of the content provided by the server to a reproduction apparatus; and

a control unit configured to control appropriateness of the reproduction request of the content to the reproduction apparatus by the reproduction request unit,

in which the control unit acquires a type of content, viewing of which is allowed by the reproduction apparatus, compares the type of the content and a type of content included in the detailed information of content requested for browsing, and determines the appropriateness of the reproduction request of the content to the reproduction apparatus.

According to the technology of claim 3 of the present disclosure, the server discloses information related to a target age for viewing as the type of content included in the detailed information of content to be provided, and the reproduction apparatus has information related to an allowable age for viewing of the content to be reproduced. Then, the control unit of the communication device according to claim 2 allows the reproduction request of content having the target age for viewing satisfying the allowable age for viewing of the reproduction apparatus.

According to the technology of claim 4 of the present disclosure, the server is a DMS operating according to DLNA standard or UPnP standard, provides CDS information with a Parental rating, and discloses information related to a target age for viewing as the type of content. Further, the reproduction apparatus is a DMR operating according to the DLNA standard or the UPnP standard, inserts an Age field into Device Description, and has information related to an allowable age for viewing of content to be reproduced. Then, the control unit of the communication apparatus according to claim 2 is configured to compare the allowable age for viewing described in the Age field in the Device Description of the DMR and the target age for viewing provided in the CDS information as the Parental rating, and allow a reproduction request of content having a target age for viewing equal to or less than the allowable age for viewing to the reproduction apparatus.

Further, the technology according to claim 5 of the present disclosure is a communication method including the steps of:

acquiring detailed information of content from a server configured to provide the content;

acquiring, from a reproduction apparatus to which reproduction of the content provided by the server is requested, a type of content, viewing of which is allowed by the reproduction apparatus; and

comparing the type of content included in the acquired detailed information of content and the type of content, viewing of which is allowed by the reproduction apparatus, to determine appropriateness of the reproduction request of the content to the reproduction apparatus.

Effects of the Invention

According to the technology disclosed in the present specification, in a system configured from 3Box of a DMS, DMC, and DMR, a superior communication system, communication device, and communication method capable of properly performing reproduction control of content according to the age restriction for viewing when the content on the DMS is reproduced with the DMR by operation from the DMC can be provided.

Other objectives, characteristics, advantages of the technology disclosed in the present specification will become clear from the following more detailed description based on the embodiments below and the attached drawings.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating a configuration example of a communication system based on 3-Box System Usage defined by DLNA Guideline 1.5.

FIG. 2 is a diagram schematically illustrating a functional configuration of a device that operates as a DMS in FIG. 1.

FIG. 3 is a diagram schematically illustrating a functional configuration of a device that operates as a DMC in FIG. 1.

FIG. 4 is a diagram schematically illustrating a functional configuration of a device that operates as a DMR in FIG. 1.

FIG. 5 is a diagram illustrating an example of Device Description described in an XML format.

FIG. 6A is a diagram illustrating an example of a communication sequence for performing acquisition of Device Description of the DMR and content browsing by the DMC in the 3-Box Pull System Usage.

FIG. 6B is a diagram illustrating an example of a communication sequence for performing content reproduction by the DMR in the 3-Box Pull System Usage.

FIG. 7 is a flowchart illustrating a processing procedure executed by the DMC for determining whether a reproduction/output of content can be requested to the DMR.

MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the technology disclosed in the present specification will be described in detail with reference to the drawings.

FIG. 1 illustrates a configuration example of a communication system based on the 3-Box System Usage defined by DLNA Guideline 1.5. A DMS that provides content through a home IP network, a DMR that reproduces the received content through the IP network, and a DMC that operates the DMR are connected according to a predetermined connection condition over the IP network laid at home. The DMS provides static content stored in an own storage. Further, the DMS is also connected to an outside network such as the Internet, and can provide live content acquired from a provider (content server) over the outside network.

FIG. 2 schematically illustrates a functional configuration of a device that operates as the DMS in FIG. 1. Hereinafter, each unit will be described.

A communication control unit 201 controls a communication operation through the home IP network and the outside network, and generally controls an overall operation of the devices.

A content acquisition unit 203 acquires content requested from the DMR. For example, when the DMS is a receiver like a set top box (STB), the content acquisition unit 203 corresponds to a tuner, and accumulates broadcasting content in a content accumulation unit 202. In addition, the content acquisition unit 203 can acquire live content requested from the DMR from a provider through the outside network.

A content providing unit 204 provides the static content accumulated in the content accumulation unit 202 and the live content acquired from the provider to the DMR as required.

A CDS information generation unit 205 generates CDS information about the static content accumulated in the content accumulation unit 202 and the live content acquired from the provider.

Here, a content directory service (CDS) is a function formulated with UPnP that serves as a base of DLNA, in which a list of content provided by a DMS and detailed information of the content are layered and delivered.

A CDS information providing unit 206 provides the CDS information generated in the CDS information generation unit 205 in response to an acquisition request of the CDS information from the DMC.

FIG. 3 schematically illustrates a functional configuration of a device that operates as the DMC in FIG. 1. Hereinafter, each unit will be described.

A communication control unit 301 controls a communication operation through the home IP network and generally controls an overall operation of the devices.

A CDS information browsing unit 302 performs an acquisition request of the CDS information to the DMS, and displays a browsing screen of the acquired CDS information. For example, when it is desired to acquire a list of content that is providable by the DMS (or acquirable through the DMS) as the CDS information, a content list screen is displayed, and the user can select content that the user wishes to reproduce/output, through the list screen.

A content reproduction request unit 303 requests reproduction/output of the content selected by the user to the DMR. The content reproduction request unit 303 also performs reproduction control according to the age restriction for viewing when requesting the reproduction/output of the content to the DMR. Details of this point will be described below.

FIG. 4 schematically illustrates a functional configuration of a device that operates as the DMR in FIG. 1. Hereinafter, each unit will be described.

A communication control unit 401 controls a communication operation through the home IP network and generally controls an overall operation of the devices.

A content acquisition unit 402 transmits, to the DMS, an acquisition request of the content that the DMC has requested the reproduction and acquires the content. A content decoding unit 403 then decodes the acquired content, and a content reproduction output unit 404 reproduces and outputs the decoded content.

Note that, for simplification of the drawings, only one DMS, DMC, and DMR each are drawn in FIG. 1. However, two or more DMSs, DMCs, and DMRs may be connected to the home IP network.

In a case of broadcasting content, in Association of Radio Industries and Businesses (ARIB) 10, for example, the restricted age for viewing of a program can be indicated by inserting a 6.2.12 Parential rating descriptor into 5.2.7 Event Information Table (EIT) that is program information.

For example, in a case where broadcasting content received by a receiver is viewed by a television receiver, when the above-described descriptor “Parential rating descriptor” is detected in the receiver, a message that prompts an input of a personal identification number is output on a screen of the television receiver as necessary. The personal identification number input by the user through a remote control operation and the like is checked against a personal identification number registered in advance, so that the restriction for viewing based on age of the content can be performed.

In a case of the system of 2Box configured from a receiver and a recording reproduction apparatus, as described in Patent Document 2, when content received by the receiver is recorded, the recording reproduction apparatus that is a recording destination confirm whether control of reproduction of the content is possible according to the age restriction for viewing. Accordingly, when the content is reproduced in the recording reproduction apparatus later, the restriction for viewing based on age of the content can be properly performed.

In contrast, in the case of a system configured from 3Box of a DMS, DMC, and DMR as illustrated in FIG. 1, when setting to the DMR is performed by control of the DMC, the content is transmitted from the DMS to the DMR, and the reproduction/output is automatically started. However, since the DMC and the DMR do not necessarily exist in the same location, if the user fails to operate the DMC, unfavorable content may be output on an unexpected DMR (for example, on a DMR in a child's room).

Therefore, the technology disclosed in the present specification keeps the DMC from carelessly outputting content having the age restriction for viewing on the DMR by introducing the following scheme.

(1) Whether the age restriction for viewing is imposed on content is provided by the DMS using meta-information. In response, the DMC acquires the meta-information of content, reproduction of which is intended to request to the DMR, and confirms whether the content has the age restriction for viewing.

(2) The DMC acquires information related to the type of device from the DMR to which the content reproduction is requested, and determines whether it is a device capable of controlling reproduction of the content according to the age restriction for viewing.

(3) The DMC compares the information related to the age restriction for viewing of the content and the information related to the type of device of the DMR to determine whether reproduction of the content is requested to the DMR.

First, a method of confirming whether content has the age restriction for viewing will be described.

In UPnP, which is a base of DLNA, a CDS function is formulated, in which a list of content provided by the DMS and detailed information of the content are layered and delivered. As described above, at the DMS side, the CDS information generation unit 205 generates the CDS information about the content accumulated in the content accumulation unit 202, and the CDS information providing unit 206 provides the CDS information in response to the acquisition request from the DMS. In addition, the CDS information generation unit 205 generates CDS information about live content acquired acquired from a provider. Meanwhile, at the DMC side, the CDS information browsing unit 302 performs an acquisition request of the CDS information to the DMS.

As a meta-data item written in Appendix B of “Content Directory: 1 Service Template Version 1.01” specified in UPnP, there is a “rating field”. At the DMS side, the CDS information generation unit 205 writes information related to a target age for viewing of content in this field, so that the “Parental Rating” of the content, that is, the age restriction for viewing can be disclosed. Then, the DMC side acquires the CDS information and refers to contents of the description in the field, so that, the DMC side can confirm whether the content is imposed the age restriction for viewing.

Next, information related to the type of device of the DMR will be described.

“Device Description” specified in a document “Basic: 1.0 Device Description Version 1.0 For UPnP™ Version 1.0” of an organization “UPnP Forum” who creates specification of UPnP and the like is information for defining the type of device (device type) specified in UPnP. The Device Description is stored in an internal memory (not illustrated) of the communication control unit 401 of the DMR, for example. The DMR presents its own capability related to the age restriction for viewing by inserting information that indicates whether reproduction control of content according to the age restriction for viewing is possible into the Device Description (hereinafter, also referred to as “DD”). Meanwhile, the DMC reads out the Device Description from the DMR to which reproduction of the content is requested, and can confirm whether the device is capable of controlling reproduction of the content according to the age restriction for viewing.

FIG. 5 is an example of the Device Description described in an XML (eXtensible Markup Language) format. A tag field is inserted into a region 501 in the illustrated Device Description, the tag field indicating whether a device is capable of controlling reproduction of content according to the age restriction for viewing.

In the region 501, a field of “Age” is provided, and an allowable age for viewing of the DMR is written in the field. When the description is “<Age>16</Age>”, as illustrated in the drawing, it means that a user of 16 years or more views the DMR (that is, the youngest user who views the DMR is 16 years old).

When the DMC reads out a value of the Age field from the Device Description acquired from the DMR, the DMC compares the value and the age restriction for viewing described in the meta item “rating” of the CDS of the content. Then, if the value of the Age field is larger than the age restriction for viewing, it can be determined that the age restriction for viewing is satisfied if the content is reproduced on the DMR.

Note that the setting of the value of the Age field is performed through a setting menu of the DMR. At that time, a person who sets the value is restricted by requesting an input of a personal identification number (PIN) and the like, so that the setting cannot be recklessly changed.

Alternatively, to indicate whether a device is capable of controlling reproduction of content according to the age restriction for viewing is possible, a “parentalCont” tag may be used in place of the “Age” tag. For example, when “<parentalCont>yes</parentalCont>” is described in the region 501, the DMR asks the user to input a password when content having the age restriction for viewing is reproduced and output. When “yes” is described in the parentalCont field in the Device Description acquired from the DMR, the DMC requests reproduction of content, while, when “no” is described, the DMC does not request reproduction of the content.

Next, a method of acquiring the information related to the type of device from the DMR by other devices such as the DMC, other than the DMR, will be described.

The Device Description illustrated in FIG. 5 is stored in an internal memory (not illustrated) of the communication control unit 401 of the DMR. The Device Description is, for example, stored in a memory before shipment of the DMR.

In addition, the DMR transmits a uniform resource locator (URL) that is address information for identifying a stored position of the Device Description in the internal memory, and the like, to the network from the communication control unit 401 as necessary.

In UPnP, a simple service discover protocol (SSDP) is specified as a service for detecting a device over the network (home IP network). The DMR multicasts the URL for identifying the stored position of the Device Description along with information identifying the DMR itself and the like according to the SSDP protocol. Note that, for details of the SSDP, refer to a document “UPnP Device Architecture 1.0” of UPnP Forum.

FIG. 6A illustrates an example of a communication sequence for performing acquisition of Device Description of the DMR and content browsing by the DMC in the 3-Box Pull System Usage.

The DMR multicasts the URL for identifying the stored position of the Device Description along with the information identifying the DMR itself and the like according to the SSDP protocol.

When having received a multicasted message according to the SSDP protocol, the DMC requests the Device Description to the DMR based on the URL described therein and receives the Device Description. The DMC then acquires the value described in the “Age” field in the Device Description. For example, the DMC acquires the Device Description by processing of the communication control unit 301 in the DMC.

Further, in content browsing, a CDS: Browse action is issued from the CDS information browsing unit 302 of the DMC to the DMS.

At the DMS side, since the CDS: Browse action is issued to the content stored in the content accumulation unit 202 that is the own storage, the CDS information generation unit 205 acquires content information related to the appropriate content from the internal database of the content accumulation unit 202 to generate CDS information. The CDS information providing unit 206 then returns the generated CDS information to the DMC as a CDS Result.

At the DMC side, the CDS information browsing unit 302 analyzes the received CDS Result, and displays the content information including meta-information such as a title of the content and a URL for acquiring the content. The user of the DMC can select content that the user wishes to reproduce from the list of content.

Further, at the DMC side, the CDS information browsing unit 302 refers to the “Parental Rating” field in the CDS information, and acquires information related to the target age of the content. The DMC then determines whether reproduction/output of the content can be requested to the DMR based on the value described in the “Age” field in the Device Description and the information related to the target age of the content acquired from the “Parental Rating” field in the CDS information. Details of the determination processing will be described below.

FIG. 6B illustrates an example of a communication sequence for performing content reproduction by the DMR in the 3-Box System. Usage. Hereinafter, it is assumed that the DMC has determined that the reproduction/output of the content can be requested to the DMR.

At the reproduction, the content reproduction request unit 303 of the DMC issues an AVT: SetAVTransportURI( ) action to the DMR, and notifies attribution information of the selected content. The attribution information of the content includes a title of the content, a size of the content, a length of the content, a URL for accessing the content, and the like. Further, the content reproduction request unit 503 issues an AVT: Play( ) action to the DMR to request reproduction start of the content.

The content acquisition unit 402 of the DMR requests the content using an HTTP Get method in response to the reproduction start request of the content from the DMC. At the DMS side, when having received the HTTP Get request, the content providing unit 204 returns (delivers) content data stored in the content accumulation unit 202 that is the own storage to the DMP by a constant capacity. At the DMR side, the content decoding unit 403 then decodes the received data, and the content reproduction output unit 404 reproduces the decoded data. Until reaching the end of the content data, the delivery of the content data from the DMS and the decoding and reproduction at the DMR side are repeated.

FIG. 7 illustrates a processing procedure executed by the DMC for determining whether a reproduction/output of content can be requested to the DMR in the form of a flowchart. The illustrated processing procedure is realized, for example, by a configuration in which a predetermined program is executed in the communication control unit 301 in the DMC.

When the DMC acquires the Device Description from the DMR (step S701), the DMC acquires the value described in the “Age” field in the Device Description, that is, the age restriction for viewing of the DMR (step S702). Since the information identifying the DMR itself and the URL for identifying the stored position of the Device Description are multicasted by the DMR, the DMC can request the Device Description using the URL (described above).

Next, the DMC requests browsing of CDS information of content that the DMC wishes to reproduce to the DMS (step S703). The DMC issues the CDS: Browse action to the DMS to request browsing of the CDS information (described above). The DMC then acquires the information related to a target age of the content by referring to the “Parental Rating” field in the CDR information returned as a CDS Result (step S704).

Next, the DMC compares large or small of the value read out from the Age field in the Device Description, that is, the age restriction for viewing of the DMR, and the target age for viewing described in the “Parental Rating” field in the CDS information (step S705).

Here, when the age restriction for viewing of the DMR is equal to or more than the target age for viewing of the content (Yes at step S705), the DMC requests reproduction of the content to the DMR (step S706). The DMC issues the AVT: SetAVTransportURI( ) action to the DMR, and further, issues the AVT: Play( ) action to request reproduction start of the content (described above).

Meanwhile, when the age restriction for viewing of the DMR is smaller than the target age for viewing of the content (No at step S705), the DMC terminates the processing routine to comply with the age restriction for viewing of the content without requesting reproduction of the content to the DMR.

By being operated according to the processing procedure illustrated in FIG. 7, the DMC does not carelessly output a program having the age restriction for viewing on the DMR when viewing a program with the 3Box, whereby harmless uses of content becomes possible.

INDUSTRIAL APPLICABILITY

As described above, specific embodiments concerning the technology disclosed in the present specification have been described in detail. However, it will be obvious to those skilled in the art that modifications and changes may be made without departing from the spirit and scope of the technology disclosed in the present specification.

While an embodiment has been mainly described, in which the present technology is applied to the 3-Box System Usage of DLNA, the spirit and scope of the technology disclosed in the present specification are not limited thereto. By implementing a scheme in which the DMC can acquire meta-information related to the age restriction for viewing of content accumulated in the DMS, and the information related to appropriateness of the reproduction control according to the age restriction for viewing of the DMR, the present technology can be applied to various types of communication systems.

Further, while an embodiment has been described in the specification, in which a delivery service of contents on which the Parental rating, that is, the age restriction for viewing is imposed is provided, the spirit and scope of the present technology are not limited by the embodiment. By describing the type of content in the CDS information of the content, and by writing allowance for viewing with respect to the type of content in the Device Description of the DMR, the DMC determines appropriateness of the reproduction/output of the content to the DMR based on the above description, whereby the present technology is similarly applicable. Examples of the type of content that should be restricted for viewing include something violent and sexual. As to content including something violent and sexual, “violent, sex” is clearly described in the meta-data item “content” in the CDS information. In addition, tag fields of “violent” and “sex” are provided in the Device Description of the DMR, and when the DMR allows the reproduction of content that includes something violent, “<violent>yes</violent>” is described, and when prohibits reproduction of content including something sexual, “<sex>no</sex>” is described. The DMC then compares the both and determines appropriateness of the reproduction/output to the DMR according to the type of content.

Element on the CDS <content>violent, sex</content>

Element on the CDS:

<content>violent, sex</content>

Element on the Device Description:

In short, the technology disclosed in the present specification has been disclosed in a form of example, and the contents of the description of the present specification should not be construed in a limited manner. Claims are to be considered to determine the spirit and scope of the present technology.

REFERENCE SIGNS LIST

201 Communication control unit

202 Content accumulation unit

203 Content acquisition unit

204 Content providing unit

205 CDS information generation unit

206 CDS information providing unit

301 Communication control unit

302 CDS information browsing unit

303 Content reproduction request unit

401 Communication control unit

402 Content acquisition unit

403 Content decoding unit

404 Content reproduction output unit

COMMUNICATION SYSTEM, COMMUNICATION DEVICE, AND COMMUNICATION METHOD

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