JP4928604B2 - Communications system - Google Patents

Description

Communication system for setting a codec capability by the present invention, for negotiating relates to communication systems, for example between communication terminal apparatuses.

Conventionally, the codec capability set by negotiation between terminal apparatuses is the same for uplink and downlink (for example, Patent Document 1). Here, the codec capability is a data compression method, a bit rate, a screen size, a frame rate, or the like.
Japanese Patent No. 3622701

  However, in Patent Document 1, in a network in which either one of the uplink and the downlink uses a low band, it is necessary to set a low codec capability so that communication is possible in the low band. Along with this, there is a problem that audio quality or video quality is deteriorated when audio data or video data is transmitted on either the uplink or the downlink.

An object of the present invention, a communication system can be prevented by setting the codec capabilities individually between uplink and downlink, that it is set both in unnecessarily low codec capabilities of the uplink and downlink Is to provide.

The communication system of the present invention is a communication system including a first communication terminal device and a second communication terminal device, and the first communication terminal device is communicating with the second communication terminal device. First receiving means for receiving from the second communication terminal device a first update request for image priority codec capability that provides a clearer image than in the case of motion priority; and the second communication terminal A first condition selection means for accepting an external selection of the motion priority condition during communication with a device; and an update of a first uplink codec capability by the received first update request for the image priority. line Utotomoni, said first first condition of said motion priority selected by the selection means of the first codec setup means for updating the downlink codec capabilities of the first codec setting means has updated the first of Ri performs encoding of uplink packet data channel codec capabilities of the first codec processing means for decoding the downlink packet data in said first of said first downlink codec capabilities of the codec setting means is updated, And the second communication terminal device receives the second update request with the motion priority from the first communication terminal device during communication with the first communication terminal device. During communication between the receiving means and the first communication terminal device, a second condition selecting means for accepting an external selection of the image priority condition, and a second uplink request by the received second update request Second codec setting for updating the codec capability of the line and for updating the codec capability of the second downlink with priority for the image selected by the second condition selection unit And encoding the uplink packet data with the codec capability of the second uplink updated by the second codec setting means, and the second downlink codec updated by the second codec setting means Second codec processing means for decoding downlink packet data with capability, and adopting a configuration for switching between the image priority and the motion priority according to the data to be transmitted during communication .

  According to the present invention, it is possible to prevent an unnecessarily low codec capability from being set on both the uplink and the downlink by individually setting the codec capability on the uplink and the downlink.

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

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a communication system 10 according to Embodiment 1 of the present invention.

  The communication device 1 is a communication terminal device such as a mobile phone, for example, and negotiates with the communication device 2 via a call control server 4 arranged in the IP network 3. Further, the communication device 1 transmits outgoing data including the IP address of the local station to the communication device 2 that is a communication partner via the call control server 4. Receive incoming data including IP address. Thereby, since the communication apparatus 1 and the communication apparatus 2 can know each other's IP address, the communication apparatus 1 directly transmits / receives media data such as audio or video to / from the communication apparatus 2.

  The communication device 2 is a communication terminal device such as a mobile phone, for example, and negotiates with the communication device 1 via a call control server 4 arranged in the IP network 3. In addition, the communication device 2 transmits outgoing data including the IP address of the local station to the communication device 1 that is a communication partner via the call control server 4. Receive incoming data including IP address. As a result, the communication device 2 directly transmits / receives media data such as audio or video to / from the communication device 1.

  The call control server 4 is arranged in the IP network 3 and performs call control such as connection and disconnection between the communication device 1 and the communication device 2.

  Here, the uplink means the line # 20 used when transmitting a signal from the communication apparatus 1 to the call control server 4 or the communication apparatus 2 in the communication apparatus 1, and in the communication apparatus 2, the communication apparatus 2 2 means a line # 30 used when a signal is transmitted from 2 to the call control server 4 or the communication device 1. Further, the downlink means a line # 40 used when transmitting a signal from the communication device 2 or the call control server 4 to the communication device 1 in the communication device 1, and in the communication device 2, the communication device 1 Alternatively, it means the line # 50 used when a signal is transmitted from the call control server 4 to the communication device 2. The line # 20 and the line # 50 are lines used for transmitting transmission data from the communication apparatus 1 to the communication apparatus 2, and the line # 30 and the line # 40 are from the communication apparatus 2 to the communication apparatus 1. A line used for transmitting transmission data.

  Next, the configuration of the communication device 1 and the communication device 2 will be described. FIG. 2 is a block diagram illustrating a configuration of the communication device 200 having the same configuration as the communication device 1 and the communication device 2.

  The condition selection unit 201 receives an external input of a condition for setting the codec capability and outputs it to the codec setting unit 202. For example, the condition selection unit 201 can select a preset condition such as “image priority” or “motion priority” from the outside, and sets the codec capability of the selected “image priority” or “motion priority”. The condition for output is output to the codec setting unit 202.

  The codec setting unit 202 individually sets the uplink codec capability and the downlink codec capability. Specifically, the codec setting unit 202 sets the codec capability for the call control processing unit 205 based on the condition for setting the codec capability selected by the condition selection unit 201. Further, the codec setting unit 202 sets the codec capability requested by the codec capability setting request input from the call control processing unit 205 and the codec requested by the codec capability update request input from the call control processing unit 205. Update to ability. For example, the codec setting unit 202 sets the downlink codec capability that allows a clearer image to be obtained when “image priority” is selected by the condition selection unit 201 than when “motion priority” is selected. Then, the codec setting unit 202 notifies the call control processing unit 205 of the set or updated codec capability. Here, the setting request is a request for setting the codec capability at the time of transmission. The update request is a request for updating the already set codec capability and setting a new codec capability during communication.

  The uplink codec processing unit 203 encodes media data such as audio or video with the codec capability set by the codec setting unit 202 under the control of the call control processing unit 205 to generate uplink packet data, and the generated uplink packet data Output to the communication control unit 206.

  The downlink codec processing unit 204 decodes the downlink packet data input from the communication control unit 206 with the codec capability set by the codec setting unit 202 under the control of the call control processing unit 205, and acquires media data such as audio or video. . The upstream codec processing unit 203 and the downstream codec processing unit 204 constitute a codec processing unit 250.

  The call control processing unit 205 performs outgoing or incoming call control with the communication partner via the communication control unit 206. Also, the call control processing unit 205 makes a request for setting or updating the codec capability set by the codec setting unit 202 to the communication partner via the communication control unit 206 in response to the notification from the codec setting unit 202. The downlink codec processing unit 204 is controlled to perform decoding with the set codec capability. The call control processing unit 205 is requested to the codec setting unit 202 by a setting request or an update request when receiving a codec capability setting request or update request from the communication partner via the communication control unit 206. Instructs you to set the codec capability. Then, the call control processing unit 205 controls the uplink codec processing unit 203 to perform encoding with the set codec capability based on the notification from the codec setting unit 202.

  The communication control unit 206 is a data communication control unit based on a communication protocol such as TCP / IP. Specifically, the communication control unit 206 up-converts a control signal such as a codec capability setting request and a call control signal input from the call control processing unit 205 from a baseband frequency to a radio frequency, thereby converting the call control server. 4 to send. Also, the communication control unit 206 down-converts the control signal such as the codec capability setting request and the call control signal received from the call control server 4 from the radio frequency to the baseband frequency, and outputs it to the call control processing unit 205 To do. Also, the communication control unit 206 up-converts media data such as audio or video input from the uplink codec processing unit 203 from a baseband frequency to a radio frequency and transmits the media data. Further, the communication control unit 206 down-converts received media data such as audio or video from a radio frequency to a baseband frequency and outputs the down-converted codec processing unit 204 to the downlink codec processing unit 204.

  Next, operations of the communication device 1 and the communication device 2 in the communication system 10 of FIG. 1 will be described with reference to FIG. FIG. 3 is a flowchart showing the operations of the communication device 1 and the communication device 2 when the codec capability is set at the time of outgoing.

  First, the condition selection unit 201 of the communication device 1 accepts selection of conditions for setting the downlink codec capability, and the codec setting unit 202 of the communication device 1 sets the downlink codec capability that satisfies the selected condition.

  Next, the call control processing unit 205 of the communication device 1 makes a call to the communication device 2 and requests the setting of the downlink codec capability of the communication path (step ST301). For example, when the condition selection unit 201 accepts an external selection of the “image priority” condition, the call control processing unit 205 requests the communication device 2 to set the codec capability of “image priority”. Make a call. At the time of outgoing call, the call control processing unit 205 of the communication device 1 transmits outgoing data including its own IP address.

  Also, the codec setting unit 202 of the communication device 1 sets the downlink codec capability requested to the communication device 2 (step ST302). For example, the codec setting unit 202 sets a downlink codec capability of “image priority”.

  Next, the call control processing unit 205 of the communication device 2 receives the call by making a call in step ST301 (step ST303).

  Next, the codec setting unit 202 of the communication device 2 that has received the call sets the downlink codec capability requested from the communication device 1 in step ST301 as the uplink codec capability (step ST304). If the codec setting unit 202 of the communication apparatus 2 cannot accept the request, that is, cannot cope with the requested codec capability, the codec setting unit 202 can refuse the request by rejecting the incoming call. Here, the reason why the communication device 2 sets the downlink codec capability requested from the communication device 1 as the uplink codec capability is that the downlink codec capability requested by the communication device 1 is the codec capability in the downlink # 40. This is because the codec capability that the communication apparatus 2 that has received the setting request sets according to the request is the codec capability of the uplink # 30.

  Next, the condition selection unit 201 of the communication device 2 accepts an external selection of the conditions for setting the downlink codec capability, and the call control processing unit 205 of the communication device 2 is selected for the communication device 1. The downlink codec capability setting that satisfies the conditions is requested (step ST305). For example, when the condition selection unit 201 accepts an external selection of the “motion priority” condition, the call control processing unit 205 requests the communication device 1 to set the codec capability of “motion priority”. . At the time of this request, the call control processing unit 205 of the communication device 2 transmits data including the IP address of the local station.

  Further, the codec setting unit 202 of the communication device 2 sets the downlink codec capability requested of the communication device 1 to the downlink codec processing unit 204 of the communication device 2 (step ST306). For example, the codec setting unit 202 sets the downlink codec capability of “motion priority”.

  Next, the codec setting unit 202 of the communication device 1 sets the downlink codec capability requested from the communication device 2 in step ST305 as the uplink codec capability (step ST307). Thereby, in the communication device 1 and the communication device 2, the same or different codec capabilities can be individually set for the uplink and the downlink of the communication path, and communication is established.

  Next, operations of the communication apparatus 1 and the communication apparatus 2 when updating the codec capability will be described with reference to FIG. FIG. 4 is a flowchart showing the operations of the communication device 1 and the communication device 2 when setting the codec capability during communication between the communication device 1 and the communication device 2, that is, when updating the codec capability.

  First, the condition selection unit 201 of the communication device 1 accepts an external selection of a condition for updating the downlink codec capability, and the codec setting unit 202 of the communication device 1 sets the downlink codec so as to satisfy the selected condition. The capability is updated (step ST401).

  Next, the call control processing unit 205 of the communication device 1 requests the communication device 2 to update the downlink codec capability of the communication path. For example, the condition selection unit 201 accepts an external selection of the “image priority” condition, so that the call control processing unit 205 updates the communication device 2 to the codec capability of “image priority”. Request.

  Further, the codec setting unit 202 of the communication device 1 updates the downlink codec capability requested to the communication device 2 (step ST402). For example, the codec setting unit 202 updates the downlink codec capability of “image priority”.

  Next, the call control processing unit 205 of the communication device 2 receives a request for updating the downlink codec capability (step ST403).

  Next, the codec setting unit 202 of the communication device 2 updates the downlink codec capability requested to be updated by the communication device 1 as the uplink codec capability (step ST404).

  Next, the condition selection unit 201 of the communication device 2 accepts an external selection of the conditions for setting the downlink codec capability, and the call control processing unit 205 of the communication device 2 is selected for the communication device 1. Update of the downlink codec capability that satisfies the conditions is requested (step ST405). For example, the condition selection unit 201 accepts an external selection of the “motion priority” condition, so that the call control processing unit 205 updates the codec capability of “motion priority” to the communication device 1. Request.

  Moreover, the codec setting unit 202 of the communication device 2 updates the downlink codec capability requested to the communication device 1 (step ST406). For example, the codec setting unit 202 updates the downlink codec capability to “motion priority”.

  Next, the codec setting section 202 of the communication device 1 updates the downlink codec capability requested to be updated from the communication device 2 in step ST405 as the uplink codec capability (step ST407). As a result, the communication device 1 and the communication device 2 can be individually updated to the same or different codec capabilities in the uplink and downlink of the communication path,

  FIG. 5 is a sequence diagram showing a codec capability setting method in the communication system 1 of FIG.

  The communication device 1 requests the call control server 4 to set the downlink codec capability (step ST501), and the call control server 4 forwards the received downlink codec capability setting request to the communication device 2. (Step ST502).

  Next, the communication device 2 requests the call control server 4 to set the downlink codec capability (step ST503), and the call control server 4 sets the received downlink codec capability to the communication device 1. The request is transferred (step ST504).

  Thus, according to the first embodiment, by setting the codec capability separately for the uplink and the downlink, an unnecessarily low codec capability is set for both the uplink and the downlink. Can be prevented, and deterioration of audio quality or video quality can be prevented. Further, according to the first embodiment, it is possible to receive downlink packet data coded with a desired codec capability by requesting the communication partner to set the downlink codec capability.

(Embodiment 2)
FIG. 6 is a block diagram showing a configuration of communication apparatus 600 according to Embodiment 2 of the present invention.

  The communication apparatus 600 according to the second embodiment adds a network information acquisition unit 601 and a network information analysis unit 602 to the communication apparatus 200 according to the first embodiment shown in FIG. A codec setting unit 603 is provided instead of the setting unit 202. In FIG. 6, parts having the same configuration as in FIG.

  The network information acquisition unit 601 acquires network information for grasping the line status of the communication path, and outputs the acquired network information to the network information analysis unit 602. For example, the network information acquisition unit 601 acquires network information from a device that monitors the line status of the communication path by wired or wireless. Here, the network information is, for example, usable bandwidth information. The network information acquisition unit 601 may acquire network information by monitoring the line status of the communication path.

  The network information analysis unit 602 analyzes the network information input from the network information acquisition unit 601 and outputs the analysis result to the codec setting unit 603. For example, the network information analysis unit 602 recognizes a usable bandwidth by analyzing the network information, and outputs the recognized usable bandwidth information to the codec setting unit 603 as an analysis result.

  The codec setting unit 603 individually sets the uplink codec capability and the downlink codec capability. Specifically, the codec setting unit 603 sets the codec capability based on the analysis result input from the network information analysis unit 602. Also, the codec setting unit 603 sets the codec capability requested by the codec capability setting request input from the call control processing unit 205, and the codec requested by the codec capability update request input from the call control processing unit 205. Update to ability. For example, the codec setting unit 603 sets the codec capability that can be set within the usable band, which is the analysis result input from the network information analysis unit 602. Then, the codec setting unit 603 notifies the call control processing unit 205 of the set or updated codec capability.

  The uplink codec processing unit 203 encodes media data such as audio or video with the codec capability set by the codec setting unit 603 under the control of the call control processing unit 205 to generate uplink packet data, and the generated uplink packet data Output to the communication control unit 206.

  The downlink codec processing unit 204 decodes the downlink packet data input from the communication control unit 206 with the codec capability set by the codec setting unit 603 under the control of the call control processing unit 205, and acquires media data such as audio or video. .

  The call control processing unit 205 performs outgoing or incoming call control with the communication partner via the communication control unit 206. Further, the call control processing unit 205 makes a request for setting or updating the codec capability set by the codec setting unit 603 to the communication partner via the communication control unit 206 in response to the notification from the codec setting unit 603. The downlink codec processing unit 204 is controlled to perform decoding with the set codec capability. The call control processing unit 205 sets the requested codec capability setting to the codec setting unit 603 when receiving a codec capability setting request or update request from the communication partner via the communication control unit 206. Instruct to do. Then, the call control processing unit 205 controls the uplink codec processing unit 203 to perform encoding with the set codec capability based on the notification from the codec setting unit 603.

  Next, operations of the communication device 1 and the communication device 2 in the communication system 10 of FIG. 1 will be described with reference to FIG. FIG. 7 is a flowchart showing the operations of the communication device 1 and the communication device 2 when the codec capability is set at the time of transmission.

  First, the network information acquisition unit 601 of the communication device 1 acquires network information for grasping the line status of the communication path (step ST701).

  Next, the network information analysis unit 602 of the communication device 1 analyzes the network information (step ST702), and the codec setting unit 603 of the communication device 1 sets the uplink codec capability based on the analysis result (step ST702). ST703), downlink codec capability is set (step ST704).

  Next, call control processing section 205 of communication device 1 transmits to communication device 2 and transmits a setting request for the set uplink codec capability and downlink codec capability (step ST705). At the time of outgoing call, the call control processing unit 205 of the communication device 1 transmits outgoing data including its own IP address.

  Next, the call control processing unit 205 of the communication apparatus 2 receives the outgoing call in step ST705 (step ST706), and receives a request for setting the uplink codec capability and the downlink codec capability.

  Next, the codec setting unit 603 of the communication device 2 that has received the call sets the downlink codec capability requested from the communication device 1 as the uplink codec capability (step ST707), and the uplink codec capability requested from the communication device 1 is set. The downlink codec capability is set (step ST708). If the codec setting unit 603 of the communication apparatus 2 cannot accept the request, that is, cannot cope with the requested codec capability, the codec setting unit 603 can reject the request by rejecting the incoming call.

  Then, the call control processing unit 205 of the communication device 2 notifies the communication device 1 that the codec capability setting has been completed. At the time of this notification, the call control processing unit 205 of the communication device 2 transmits data including the IP address of the local station.

  Next, the codec setting unit 202 of the communication device 1 completes the setting upon receiving a notification from the communication device 2 that the codec capability setting has been completed (step ST709). Thereby, in the communication device 1 and the communication device 2, the same or different codec capabilities can be individually set for the uplink and the downlink of the communication path, and communication is established.

  Next, the operations of the communication device 1 and the communication device 2 when updating the codec capability setting will be described with reference to FIG. FIG. 8 is a flowchart showing operations of the communication apparatus 1 and the communication apparatus 2 when updating the codec capability.

  First, the network information acquisition unit 601 of the communication device 1 acquires network information for grasping the line status of the communication path (step ST801).

  Next, the network information analysis unit 602 of the communication apparatus 1 analyzes the network information (step ST802), and the codec setting unit 603 of the communication apparatus 1 needs to update the codec capability setting based on the analysis result. Whether or not (step ST803).

  When it is determined that the codec capability setting needs to be updated, the codec setting unit 603 of the communication apparatus 1 sets the uplink codec capability based on the analysis result (step ST804) and sets the downlink codec capability. Set (step ST805).

  Next, the call control processing unit 205 of the communication device 1 requests the communication device 2 to update the downlink codec capability or update the uplink codec capability (step ST806).

  Next, call control processing section 205 of communication apparatus 2 receives an update request (step ST807).

  Next, the codec setting section 603 of the communication device 2 sets the downlink codec capability requested to be updated from the communication device 1 as the uplink codec capability (step ST808), and the uplink codec capability requested to be updated from the communication device 1 is set. The downlink codec capability is set (step ST809).

  Then, the call control processing unit 205 of the communication device 2 notifies the communication device 1 that the codec capability update has been completed.

  Next, the codec setting section 603 of the communication apparatus 1 completes the update upon receiving a notification from the communication apparatus 2 that the update of the codec capability has been completed (step ST810). As a result, the communication device 1 and the communication device 2 can be individually set to the same or different codec capabilities in the uplink and downlink of the communication path,

  As described above, according to the second embodiment, by setting the codec capability separately for the uplink and the downlink, an unnecessarily low codec capability is set for both the uplink and the downlink. Can be prevented, and deterioration of audio quality or video quality can be prevented. Further, according to the second embodiment, by setting the codec capability based on the analysis result of the network information, it is not necessary to select the codec capability in both communication apparatuses, and the codec suitable for the network environment Capabilities can be set quickly.

  In the second embodiment, only the communication device 1 sets the uplink codec capability or the downlink codec capability based on the network information. However, the present invention is not limited to this, and both the communication device 1 and the communication device 2 are connected to the network. The uplink codec capability or the downlink codec capability may be set based on the information.

The communication system according to the present invention is suitable for setting the codec capability by, for example, negotiation between communication terminal apparatuses.

The figure which shows the structure of the communication system which concerns on Embodiment 1 of this invention. The block diagram which shows the structure of the communication apparatus which concerns on Embodiment 1 of this invention. The flowchart which shows operation | movement of the communication apparatus which concerns on Embodiment 1 of this invention. The flowchart which shows operation | movement of the communication apparatus which concerns on Embodiment 1 of this invention. Sequence diagram showing a codec capability setting method according to the first embodiment of the present invention The block diagram which shows the structure of the communication apparatus which concerns on Embodiment 2 of this invention. The flowchart which shows operation | movement of the communication apparatus which concerns on Embodiment 2 of this invention. The flowchart which shows operation | movement of the communication apparatus which concerns on Embodiment 2 of this invention.

Claims (1)

A communication system comprising a first communication terminal device and a second communication terminal device,
The first communication terminal device is:
A first update request is received from the second communication terminal device during the communication with the second communication terminal device from the second communication terminal device for a first update request of image priority codec capability that provides a clearer image than in the case of motion priority . Means for receiving
A first condition selection means for accepting an external selection of the motion priority condition during communication with the second communication terminal device;
Said received image priority of the first update request line to update the codec capabilities of the first uplink by Utotomoni first downlink codec of the first condition selected the motion priority by the selection means First codec setting means for updating the capability ;
The upstream packet data is encoded with the codec capability of the first uplink updated by the first codec setting unit , and the downlink is encoded with the codec capability of the first downlink updated by the first codec setting unit. First codec processing means for decoding packet data;
Comprising
The second communication terminal device
A second receiving means for receiving the motion-priority second update request from the first communication terminal apparatus during communication with the first communication terminal apparatus;
Second condition selection means for accepting an external selection of the image priority condition during communication with the first communication terminal device;
The codec capability of the second uplink is updated according to the received second update request, and the codec capability of the second downlink with priority for the image selected by the second condition selection unit is updated. Second codec setting means;
The upstream codec data is encoded with the second uplink codec capability updated by the second codec setting unit, and the downlink codec capability is updated with the second downlink codec capability updated by the second codec setting unit. Second codec processing means for decoding packet data;
Comprising
A communication system that switches between the image priority and the motion priority according to data to be transmitted during communication.

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