WO2015196356A1 - Method and apparatus for interactive communication - Google Patents

Method and apparatus for interactive communication Download PDF

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Publication number
WO2015196356A1
WO2015196356A1 PCT/CN2014/080600 CN2014080600W WO2015196356A1 WO 2015196356 A1 WO2015196356 A1 WO 2015196356A1 CN 2014080600 W CN2014080600 W CN 2014080600W WO 2015196356 A1 WO2015196356 A1 WO 2015196356A1
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WO
WIPO (PCT)
Prior art keywords
contents
communication channel
condition
communication
received
Prior art date
Application number
PCT/CN2014/080600
Other languages
French (fr)
Inventor
Kai Xie
Original Assignee
Thomson Licensing
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomson Licensing filed Critical Thomson Licensing
Priority to PCT/CN2014/080600 priority Critical patent/WO2015196356A1/en
Publication of WO2015196356A1 publication Critical patent/WO2015196356A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/24—Negotiation of communication capabilities
    • 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
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
    • H04L67/61—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources taking into account QoS or priority requirements

Definitions

  • the present disclosure generally relates to a method and an apparatus for interactive communications, and to a program and a computer-readable storage medium having stored therein the program for causing a computer to perform a process related to such interactive
  • Interactive communications are popularly used for various applications, including transmission and reception of contents such as video contents.
  • the interactive communications are made over communication channels including wireless networks, cable networks, and the Internet.
  • these communication channels may be regarded as best-effort-channels in that the bandwidth and stability thereof are not guaranteed.
  • Techniques such as the FEC (Forward Error Correction) , the ARQ (Automatic Repeat Request) , and the hybrid FEC/ARQ that is a mixture of FEC and ARQ, have been proposed to reduce the data error and data loss between a transmitting end apparatus and a receiving end apparatus.
  • RTCP Real-time Transport Control Protocol
  • RTT Red-Trip Time
  • IP Internet Protocol
  • a method may include determining, in a first apparatus, a first condition of a communication channel based on first contents received via the communication channel; computing, in the first apparatus, a first parameter for second contents to be transmitted via the communication channel, based on the first condition; and encoding, in the first apparatus, the second contents based on the first
  • an apparatus may include a processor configured to determine a condition of a communication channel based on first contents received via the communication channel; compute a parameter for second contents to be transmitted via the communication channel, based on the condition; and encode the second contents based on the parameter, into encoded second contents to be transmitted via the communication channel .
  • a computer-readable storage medium having stored therein a program which, when executed by a
  • the computer may cause the computer to perform a process that includes determining a condition of a communication channel based on first contents received via the
  • FIG. 1 is a block diagram illustrating an example of a communication system in an embodiment of the present disclosure
  • FIG. 2 is a block diagram illustrating an example of a communication apparatus illustrated in FIG. 1;
  • FIG. 3 is a functional block diagram illustrating an example of the communication apparatus illustrated in FIG. 2;
  • FIG. 4 is a flow chart for explaining an operation of the communication apparatus illustrated in FIG. 3.
  • FIG. 1 is a block diagram illustrating an example of a communication system in an embodiment of the present disclosure.
  • a communication system 1 illustrated in FIG. 1 includes a communication apparatus 11 and a communication apparatus 11 .
  • the communication apparatus 12 that are communicable via one or more communication channels 13.
  • the communication apparatuses 11 and 12 may have the same configuration, for example.
  • the communication channels 13 may include any one of or any combination of one or more wireless networks, one or more cable networks, and the Internet.
  • FIG. 2 is a block diagram illustrating an example of the communication apparatus illustrated in FIG. 1. Because the communication apparatuses 11 and 12 may have the same configuration as explained above, a description will only be given of the configuration of the communication
  • the communication apparatus 11 illustrated in FIG. 2 includes a CPU (Central Processing Unit) 21, a storage 22, and a communication unit 23 that may be connected via a bus 24, for example.
  • the CPU 21 is an example of a processor or a general-purpose computer that controls an operation of the communication apparatus 11.
  • the storage 22 may store one or more programs to be executed by the CPU 21, and various data.
  • the various data may include data and parameters to be used by
  • the storage 22 may be formed by any suitable non- transitory computer-readable storage medium, including magnetic, optical, and magneto-optical recording media, and semiconductor memory devices.
  • the storage 22 may be formed by a combination of the magnetic disk and a disk drive unit that reads information from and writes information to the magnetic disk.
  • the communication unit 23 may have a known configuration to transmit and receive contents, data, or the like.
  • the communication unit 23 may include a transmitter and a receiver for making wireless communications via an antenna (not illustrated) .
  • the communication unit 23 may include an interface for making cable communications via a modem (not illustrated) .
  • the communication unit 23 may be configured to include the modem.
  • FIG. 3 is a functional block diagram illustrating an example of the communication apparatus having the hardware configuration illustrated in FIG. 2. Because the communication apparatuses 11 and 12 may have the same configuration as explained above, a description will only be given of the functional configuration of the
  • the communication apparatus 11 illustrated in FIG. 3 includes a receiving unit 31, a first analyzing unit 32, a second analyzing unit 33, an encoding unit 34, and a sending unit 35. Functions, processes, or procedures of the receiving unit 31, the first and second analyzing units 32 and 33, the encoding unit 34, and the sending unit 35 may be performed by the CPU 21 by executing one or more programs .
  • the receiving unit 31 receives contents from the
  • the first analyzing unit 32 analyzes the received contents to judge whether the received contents are the contents received at a start of the communication. In a case in which the first analyzing unit 32 judges that the received contents are the contents received at the start of the communication, the first analyzing unit 32 determines, by computation, features of the communication channel 13 based on analysis of the received contents.
  • the features of the communication channel 13 are examples of conditions or restrictions on the communication channel 13, and may include at least one of a packet loss rate, an average bandwidth, and a QoS (Quality of Service) of the
  • the communication channel 13 may further include information indicating capabilities of the communication apparatus 12 at the transmitting end, for example.
  • the second analyzing unit 33 decodes and analyzes the received contents, in order to compute parameters for contents to be transmitted via the communication unit 23 and the communication channel 13 to the communication apparatus 12 at the transmitting end. More particularly, the second analyzing unit 33 computes the parameters of the decoded, received contents, based on the features computed by the first analyzing unit 32. For example, the second analyzing unit 33 decodes a bit stream of packets of the received contents, and computes the parameters of the bit stream that suit the features.
  • the parameters may include at least one of a bit rate, a size of slices, a frame rate, and a resolution of the first contents .
  • the encoding unit 34 encodes contents to be transmitted to the communication apparatus 12 via the communication unit 23 and the communication channel 13, based on the parameters that suit the features of the communication channel 13.
  • the sending unit 35 sends encoded contents to the communication apparatus 12 at the transmitting end via the communication unit 23 and the communication channel 13.
  • FIG. 4 is a flow chart for explaining an operation of the communication apparatus illustrated in FIG. 3.
  • the process of steps SI through S7 illustrated in FIG. 4 may be performed by the CPU 21 illustrated in FIG. 2 by executing one or more programs. It is assumed for the sake of convenience that the communication apparatus 11 forms a receiving end apparatus and the communication apparatus 12 forms a transmitting end apparatus .
  • the receiving unit 31 receives contents from the communication apparatus 12 via the communication channel 13 and the communication unit 23.
  • the contents are not limited to particular contents, and may be video contents containing a video stream, for example.
  • the contents may be received in the form of packets, for example.
  • step S2 the first analyzing unit 32 analyzes the received contents, and judges whether received contents are the contents received at a start of the communication.
  • the contents received at the start of the communication may be detected by a known method, such as detecting a header of the packet.
  • the process advances to step S3 when the judgment result in step S2 is YES, and the process advances to step S4 which will be described later when the judgment result in step S2 is NO.
  • step S3 the first analyzing unit 32 determines, by computation, the conditions of the communication channel 13 based on analysis of the received contents, and the process advances to step S4.
  • the first analyzing unit 32 may compute network features, for example.
  • the first analyzing unit 32 computes the conditions including at least one of a packet loss rate, an average bandwidth, and a QoS (Quality of Service) , which are examples of information indicating capacities of the communication channel 13.
  • communication channel 13 may further include information indicating capabilities of the communication apparatus 12 at the transmitting end, for example.
  • step S4 the second analyzing unit 33 decodes the received contents into a bit stream of packets of the received contents.
  • the second analyzing unit 33 computes and analyzes the parameters of the decoded, received contents, based on the conditions computed by the first analyzing unit 32 in step S3. More particularly, in step S5, the second analyzing unit 33 computes and
  • the parameters may include at least one of a bit rate, a size of slices (or pixel matrix size) , a frame rate, and a resolution of the received contents.
  • step S6 the encoding unit 34 encodes contents to be transmitted to the communication apparatus 12 at the transmitting end via the communication channel 13, based on the parameters, and the process advances to step S7.
  • step S7 the sending unit 35 sends a bit stream of packets of the encoded contents to the communication apparatus 12 at the transmitting end via the communication unit 23 and the communication channel 13, and the process returns to step SI.
  • the process illustrated in FIG. 4 may also be performed in the communication apparatus 12 at the transmitting end, which receives the encoded contents from the communication apparatus 11 at the receiving end, via the communication channel 13. Further, the process illustrated in FIG. 4 may be repeated by being alternately performed by the communication apparatus 11 at the receiving end and by the communication apparatus 12 at the transmitting end.
  • the contents to be transmitted can be encoded using a parameter, such as a bit rate, a size of slices (or pixel matrix size) , a frame rate, and a resolution of the contents, so that the encoded contents are suitable for the condition of the communication channel, and the data error and data loss between the transmitting end apparatus and the receiving end apparatus can be reduced.
  • a parameter such as a bit rate, a size of slices (or pixel matrix size) , a frame rate, and a resolution of the contents

Abstract

A method determines (S3) a condition of a communication channel based on first contents received via the communication channel, computes (S4,S5) a parameter for second contents to be transmitted via the communication channel, based on the condition, and encodes (S6) the second contents based on the parameter, into encoded second contents to be transmitted via the communication channel.

Description

METHOD AND APPARATUS FOR INTERACTIVE COMMUNICATION FIELD The present disclosure generally relates to a method and an apparatus for interactive communications, and to a program and a computer-readable storage medium having stored therein the program for causing a computer to perform a process related to such interactive
communications.
BACKGROUND
Interactive communications are popularly used for various applications, including transmission and reception of contents such as video contents. The interactive communications are made over communication channels including wireless networks, cable networks, and the Internet. However, these communication channels may be regarded as best-effort-channels in that the bandwidth and stability thereof are not guaranteed. Techniques such as the FEC (Forward Error Correction) , the ARQ (Automatic Repeat Request) , and the hybrid FEC/ARQ that is a mixture of FEC and ARQ, have been proposed to reduce the data error and data loss between a transmitting end apparatus and a receiving end apparatus.
On the other hand, it is desirable to know, at the transmitting end apparatus, the capabilities of the receiving end apparatus, in order to determine a bit rate or the like to be used for transmitting the data to the receiving end apparatus. Techniques have been proposed to notify the capabilities of the receiving end apparatus to the transmitting end apparatus prior to the communication. In addition, in order to minimize data error and data loss between the transmitting end apparatus and the receiving end apparatus, it is desirable to detect capacities of the communication channels through which the data are
transmitted so that a suitable bit rate or the like can be used for transmitting the data to the receiving end apparatus . Techniques have been proposed to employ the RTCP (Real-time Transport Control Protocol) and notify to the transmitting end apparatus an RTT (Round-Trip Time) of an IP (Internet Protocol) packet between the transmitting end apparatus and the receiving end apparatus, indicating the capacities of the communication channels. However, notifying the capabilities of the receiving end apparatus to the transmitting end apparatus prior to the communication requires an additional communication step. In addition, notifying the capacities of the communication channels to the transmitting end apparatus also requires an additional communication step. Accordingly, such notifying the capabilities of the receiving end apparatus and notifying the capacities of the communication channels to the transmitting end apparatus are unsuited for the interactive communications between the transmitting end apparatus and the receiving end apparatus, in that additional band and time are consumed thereby. In other words, it is conventionally difficult to efficiently provide interactive communications suitable for the communication channels to be used by the interactive communications.
Examples of the proposed techniques may be found in
JP2001-257715A and JP2001-257715A. SUMMARY
According to an aspect of the present disclosure, a method may include determining, in a first apparatus, a first condition of a communication channel based on first contents received via the communication channel; computing, in the first apparatus, a first parameter for second contents to be transmitted via the communication channel, based on the first condition; and encoding, in the first apparatus, the second contents based on the first
parameter, into encoded second contents to be transmitted via the communication channel. According to another aspect of the present disclosure, an apparatus may include a processor configured to determine a condition of a communication channel based on first contents received via the communication channel; compute a parameter for second contents to be transmitted via the communication channel, based on the condition; and encode the second contents based on the parameter, into encoded second contents to be transmitted via the communication channel . According to still another aspect of the present
disclosure, a computer-readable storage medium having stored therein a program which, when executed by a
computer, may cause the computer to perform a process that includes determining a condition of a communication channel based on first contents received via the
communication channel; computing a parameter for second contents to be transmitted via the communication channel, based on the condition; and encoding the second contents based on the parameter, into encoded second contents to be transmitted via the communication channel.
The object and advantages of the present disclosure will be realized and attained by means of the elements and combinations particularly pointed out in the claims.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram illustrating an example of a communication system in an embodiment of the present disclosure;
FIG. 2 is a block diagram illustrating an example of a communication apparatus illustrated in FIG. 1;
FIG. 3 is a functional block diagram illustrating an example of the communication apparatus illustrated in FIG. 2; and
FIG. 4 is a flow chart for explaining an operation of the communication apparatus illustrated in FIG. 3.
DESCRIPTION OF EMBODIMENTS
Embodiments of the present disclosure will be described with reference to the accompanying drawings. A description will now be given of a method, an apparatus, and a computer-readable storage medium, in each embodiment according to the present disclosure. FIG. 1 is a block diagram illustrating an example of a communication system in an embodiment of the present disclosure. A communication system 1 illustrated in FIG. 1 includes a communication apparatus 11 and a
communication apparatus 12 that are communicable via one or more communication channels 13. The communication apparatuses 11 and 12 may have the same configuration, for example. The communication channels 13 may include any one of or any combination of one or more wireless networks, one or more cable networks, and the Internet.
FIG. 2 is a block diagram illustrating an example of the communication apparatus illustrated in FIG. 1. Because the communication apparatuses 11 and 12 may have the same configuration as explained above, a description will only be given of the configuration of the communication
apparatus 11 for the sake of convenience.
The communication apparatus 11 illustrated in FIG. 2 includes a CPU (Central Processing Unit) 21, a storage 22, and a communication unit 23 that may be connected via a bus 24, for example. The CPU 21 is an example of a processor or a general-purpose computer that controls an operation of the communication apparatus 11. The storage 22 may store one or more programs to be executed by the CPU 21, and various data. The various data may include data and parameters to be used by
computations performed by the CPU 21, intermediate data of the computations performed by the CPU 21, or the like. The storage 22 may be formed by any suitable non- transitory computer-readable storage medium, including magnetic, optical, and magneto-optical recording media, and semiconductor memory devices. For example, in a case in which a magnetic disk is used as the magnetic recording medium, the storage 22 may be formed by a combination of the magnetic disk and a disk drive unit that reads information from and writes information to the magnetic disk.
The communication unit 23 may have a known configuration to transmit and receive contents, data, or the like. In a case in which the communication channel 13 is a wireless network, for example, the communication unit 23 may include a transmitter and a receiver for making wireless communications via an antenna (not illustrated) . On the other hand, in a case in which the communication channel 13 is a cable network or the Internet, for example, the communication unit 23 may include an interface for making cable communications via a modem (not illustrated) . The communication unit 23 may be configured to include the modem. FIG. 3 is a functional block diagram illustrating an example of the communication apparatus having the hardware configuration illustrated in FIG. 2. Because the communication apparatuses 11 and 12 may have the same configuration as explained above, a description will only be given of the functional configuration of the
communication apparatus 11 for the sake of convenience.
The communication apparatus 11 illustrated in FIG. 3 includes a receiving unit 31, a first analyzing unit 32, a second analyzing unit 33, an encoding unit 34, and a sending unit 35. Functions, processes, or procedures of the receiving unit 31, the first and second analyzing units 32 and 33, the encoding unit 34, and the sending unit 35 may be performed by the CPU 21 by executing one or more programs .
The receiving unit 31 receives contents from the
communication apparatus 12 via the communication channel 13 and the communication unit 23.
The first analyzing unit 32 analyzes the received contents to judge whether the received contents are the contents received at a start of the communication. In a case in which the first analyzing unit 32 judges that the received contents are the contents received at the start of the communication, the first analyzing unit 32 determines, by computation, features of the communication channel 13 based on analysis of the received contents. The features of the communication channel 13 are examples of conditions or restrictions on the communication channel 13, and may include at least one of a packet loss rate, an average bandwidth, and a QoS (Quality of Service) of the
communication channel 13. The features of the
communication channel 13 may further include information indicating capabilities of the communication apparatus 12 at the transmitting end, for example. In a case in which the first analyzing unit 32 judges that the received contents are not the contents received at the start of the communication, the second analyzing unit 33 decodes and analyzes the received contents, in order to compute parameters for contents to be transmitted via the communication unit 23 and the communication channel 13 to the communication apparatus 12 at the transmitting end. More particularly, the second analyzing unit 33 computes the parameters of the decoded, received contents, based on the features computed by the first analyzing unit 32. For example, the second analyzing unit 33 decodes a bit stream of packets of the received contents, and computes the parameters of the bit stream that suit the features. The parameters may include at least one of a bit rate, a size of slices, a frame rate, and a resolution of the first contents .
The encoding unit 34 encodes contents to be transmitted to the communication apparatus 12 via the communication unit 23 and the communication channel 13, based on the parameters that suit the features of the communication channel 13. The sending unit 35 sends encoded contents to the communication apparatus 12 at the transmitting end via the communication unit 23 and the communication channel 13.
FIG. 4 is a flow chart for explaining an operation of the communication apparatus illustrated in FIG. 3. The process of steps SI through S7 illustrated in FIG. 4 may be performed by the CPU 21 illustrated in FIG. 2 by executing one or more programs. It is assumed for the sake of convenience that the communication apparatus 11 forms a receiving end apparatus and the communication apparatus 12 forms a transmitting end apparatus .
In step SI, the receiving unit 31 receives contents from the communication apparatus 12 via the communication channel 13 and the communication unit 23. The contents are not limited to particular contents, and may be video contents containing a video stream, for example. In addition, the contents may be received in the form of packets, for example.
In step S2, the first analyzing unit 32 analyzes the received contents, and judges whether received contents are the contents received at a start of the communication. The contents received at the start of the communication may be detected by a known method, such as detecting a header of the packet. The process advances to step S3 when the judgment result in step S2 is YES, and the process advances to step S4 which will be described later when the judgment result in step S2 is NO. In step S3, the first analyzing unit 32 determines, by computation, the conditions of the communication channel 13 based on analysis of the received contents, and the process advances to step S4. The first analyzing unit 32 may compute network features, for example. In this example, the first analyzing unit 32 computes the conditions including at least one of a packet loss rate, an average bandwidth, and a QoS (Quality of Service) , which are examples of information indicating capacities of the communication channel 13. The conditions of the
communication channel 13 may further include information indicating capabilities of the communication apparatus 12 at the transmitting end, for example.
In step S4, the second analyzing unit 33 decodes the received contents into a bit stream of packets of the received contents. In step S5, the second analyzing unit 33 computes and analyzes the parameters of the decoded, received contents, based on the conditions computed by the first analyzing unit 32 in step S3. More particularly, in step S5, the second analyzing unit 33 computes and
analyzes the parameters of the bit stream of packets, that suit the conditions of the communication channel 13 computed in step S3. The parameters may include at least one of a bit rate, a size of slices (or pixel matrix size) , a frame rate, and a resolution of the received contents.
In step S6, the encoding unit 34 encodes contents to be transmitted to the communication apparatus 12 at the transmitting end via the communication channel 13, based on the parameters, and the process advances to step S7.
In step S7, the sending unit 35 sends a bit stream of packets of the encoded contents to the communication apparatus 12 at the transmitting end via the communication unit 23 and the communication channel 13, and the process returns to step SI.
The process illustrated in FIG. 4 may also be performed in the communication apparatus 12 at the transmitting end, which receives the encoded contents from the communication apparatus 11 at the receiving end, via the communication channel 13. Further, the process illustrated in FIG. 4 may be repeated by being alternately performed by the communication apparatus 11 at the receiving end and by the communication apparatus 12 at the transmitting end.
According to the embodiments described above, it is possible to efficiently provide interactive communications suitable for the communication channel to be used by the interactive communications. In addition, the contents to be transmitted can be encoded using a parameter, such as a bit rate, a size of slices (or pixel matrix size) , a frame rate, and a resolution of the contents, so that the encoded contents are suitable for the condition of the communication channel, and the data error and data loss between the transmitting end apparatus and the receiving end apparatus can be reduced. In a case in which the contents include video contents containing a video stream, for example, a continuity of the video contents that are received via the communication channels can be improved since the video contents are encoded based on the
parameter that suits the condition of the communication channel .
It is also possible to efficiently provide interactive communications suitable for the capabilities of the communication apparatus, by including the capabilities of the communication apparatus in the condition that is used to compute the parameter for the contents to be
transmitted via the communication channel. In this case, it is possible to determine the bit rate or the like to be used for transmitting the contents to the communication apparatus, based on the capabilities of the communication apparatus included in the condition.
All examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the disclosure and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of the superiority and inferiority of the disclosure.
Although the embodiments of the present disclosure have been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the scope of the disclosure .

Claims

1. A method comprising:
determining (S3), in a first apparatus (11), a first condition of a communication channel (13) based on first contents received via the communication channel;
computing (S4, S5) , in the first apparatus, a first parameter for second contents to be transmitted via the communication channel, based on the first condition; and encoding (S6) , in the first apparatus, the second contents based on the first parameter, into encoded second contents to be transmitted via the communication channel.
2. The method as claimed in claim 1, wherein the first condition includes at least one of a packet loss rate, an average bandwidth, a QoS (Quality of Service) of the communication channel, and information indicating
capabilities of a second apparatus (12) from which the first contents are received.
3. The method as claimed in claim 1 or 2, wherein the first parameter includes at least one of a bit rate, a size of slices, a frame rate, and a resolution of the first contents.
4. The method as claimed in any of claims 1 to 3, further comprising:
judging (SI, S2), in the first apparatus, whether the first contents are received at a start of a communication, wherein the determining determines the first condition when the judging judges that the first contents are received at the start of the communication, and
wherein the computing computes the first parameter that suits the first condition of the communication channel .
5. The method as claimed in any of claims 1 to 4, wherein the first contents include video contents containing a video stream.
6. The method as claimed in any of claims 1 to 5, further comprising:
determining (S3) , in a second apparatus (12) , a second condition of the communication channel (13) based on the second contents received from the first apparatus (11) via the communication channel;
computing (S4, S5) , in the second apparatus, a second parameter for the first contents to be transmitted to the first apparatus via the communication channel, based on the second condition; and
encoding (S6) , in the second apparatus, the first contents based on the second parameter, into encoded first contents to be transmitted to the first apparatus via the communication channel, in order to perform interactive communications between the first and second apparatuses.
7. An apparatus (11) comprising:
a processor (21; 31-35) configured to
determine a condition of a communication channel (13) based on first contents received via the
communication channel;
compute a parameter for second contents to be transmitted via the communication channel, based on the condition; and
encode the second contents based on the parameter, into encoded second contents to be transmitted via the communication channel.
8. The apparatus as claimed in claim 7, wherein the condition includes at least one of a packet loss rate, an average bandwidth, a QoS (Quality of Service) of the communication channel, and information indicating
capabilities of another apparatus (12) from which the first contents are received.
9. The apparatus as claimed in claim 7 or 8, wherein the parameter includes at least one of a bit rate, a size of slices, a frame rate, and a resolution of the first contents .
10. The apparatus as claimed in any of claims 7 to 9, wherein the processor is further configured to
judge whether the first contents are received at a start of a communication,
wherein the determine determines the condition when the judge judges that the first contents are received at the start of the communication, and
wherein the compute computes the parameter that suits the condition of the communication channel.
11. The apparatus as claimed in any of claims 7 to 10, wherein the first contents include video contents
containing a video stream.
12. The apparatus as claimed in any of claims 7 to 11, wherein the first contents are received from another apparatus via the communication channel, and the second contents are transmitted to the other apparatus via the communication channel, in order to perform interactive communications between the apparatus and the other apparatus .
13. A computer-readable storage medium (22) having stored therein a program which, when executed by a computer (21) , causes the computer to perform a process including:
determining a condition of a communication channel based on first contents received via the communication channel ;
computing a parameter for second contents to be transmitted via the communication channel, based on the condition; and
encoding the second contents based on the parameter, into encoded second contents to be transmitted via the communication channel.
14. The computer-readable storage medium as claimed in claim 13, wherein the condition includes at least one of a packet loss rate, an average bandwidth, a QoS (Quality of Service) of the communication channel, and information indicating capabilities of an apparatus from which the first contents are received.
15. The computer-readable storage medium as claimed in claim 13 or 14, wherein the parameter includes at least one of a bit rate, a size of slices, a frame rate, and a resolution of the first contents.
16. The computer-readable storage medium as claimed in any of claims 13 to 15, wherein the process further includes :
judging whether the first contents are received at a start of a communication, wherein the determining determines the condition when the judging judges that the first contents are received at the start of the communication, and
wherein the computing computes the parameter that suits the condition of the communication channel.
17. The computer-readable storage medium as claimed in any of claims 13 to 16, wherein the first contents include video contents containing a video stream.
PCT/CN2014/080600 2014-06-24 2014-06-24 Method and apparatus for interactive communication WO2015196356A1 (en)

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