JP2005260458A - Communication method in communication network system, communication network system and drive program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance voice quality by eliminating the need of a relay router for monitoring all packet flows. <P>SOLUTION: A communication method in a communication network system is characterized in that when a VoIP-TA 200 confirms that the arrival of a voice packet is delayed from a normal state arrival interval time being a time at which the voice packet is to be arrived, the VoIP-TA 200 increments a ToS value denoting a transmission priority of the voice packet transmitted from the VoIP-TA 200 to a VoIP-TA 400, when receiving the voice packet whose ToS value is incremented from the VoIP-TA 200, the VoIP-TA 400 compares the ToS value of the voice packet transmitted to the VoIP-TA 200 with the ToS value of the voice packet received from the VoIP-TA 200, and sets the ToS value which is greater as the ToS value of the voice packet to be transmitted from the VoIP-TA 400. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a communication method for a communication network system using VoIP, a communication network system, a first VoIP-TA, a second VoIP-TA, and a driving program, and more particularly to a communication method for a communication network system for increasing priority. The present invention relates to a communication network system, a first VoIP-TA, a second VoIP-TA, and a driving program.

In the prior art, in a VoIP (Voice over IP) system, packets are monitored by a relay router to control congestion of voice data.
JP 2003-046563 A JP 2003-179636 A

  However, the above conventional technique has the following problems.

  The first problem is that the relay router needs to monitor the entire packet flow, which is not easy to realize.

  The second problem is that voice quality cannot be improved because congestion is controlled.

  Therefore, the present invention aims to solve the above problems.

  As a means for solving the above-described problems, the present invention provides a communication network that performs communication in a network system in which a first VoIP-TA (terminal adapter) that performs communication using VoIP and a second VoIP-TA are connected. In the system communication method, the first VoIP-TA constantly monitors the arrival time of a voice packet transmitted from the second VoIP-TA, and the first VoIP-TA receives the voice packet. This is a value indicating the transmission priority of the voice packet to the second VoIP-TA that is transmitted by the first VoIP-TA when it is confirmed that it is delayed from the normal arrival interval time that is supposed to be The ToS value is incremented, and the second VoIP-TA transmits the voice packet with the ToS value incremented to the first VoIP-T. The ToS value of the voice packet sent to the first VoIP-TA and the ToS value of the voice packet received from the first VoIP-TA The ToS value is set as the ToS value of a voice packet transmitted by the second VoIP-TA.

  Further, the present invention provides a communication network system in which a first VoIP-TA (terminal adapter) that performs communication using a VoIP protocol and a second VoIP-TA are connected, wherein the first VoIP-TA includes the first VoIP-TA, Means for constantly monitoring the arrival time of the voice packet sent from the second VoIP-TA, and a value indicating the sending priority of the voice packet to the second VoIP-TA sent by the first VoIP-TA Means for incrementing the ToS value, wherein the second VoIP-TA includes the ToS value of the voice packet transmitted to the first VoIP-TA and the second VoIP- Means for comparing the ToS value of the voice packet received from the TA, and means for setting the ToS value of the voice packet transmitted by the second VoIP-TA; Here, when the constantly monitoring means confirms that the voice packet is delayed from the normal arrival interval time, which is the time that the voice packet should arrive, the increment means increments and the ToS value is When the second VoIP-TA receives the incremented voice packet from the first VoIP-TA, the comparison unit performs comparison, and the setting unit is larger as a result of the comparison by the comparison unit. The above ToS value is set.

  Further, the present invention provides the first VoIP-TA of the communication network system in which the first VoIP-TA (terminal adapter) that communicates using the VoIP protocol and the second VoIP-TA are connected. Means for constantly monitoring the arrival time of the voice packet sent from the second VoIP-TA, and a value indicating the sending priority of the voice packet to the second VoIP-TA sent by the first VoIP-TA Means for incrementing a certain ToS value, and when the constant monitoring means confirms that the voice packet is delayed from a normal arrival interval time, which is the time that the voice packet should arrive, the increment means increments. It is characterized by implementing.

  The present invention also provides the second VoIP-TA of the communication network system in which the first VoIP-TA (terminal adapter) that communicates using the VoIP protocol and the second VoIP-TA are connected. Means for comparing a ToS value, which is a value indicating a transmission priority of a voice packet transmitted to one VoIP-TA, and the ToS value of a voice packet received from the second VoIP-TA; And a means for setting the ToS value of the voice packet transmitted by the second VoIP-TA, and when the voice packet with the incremented ToS value is received from the first VoIP-TA, The comparison means performs comparison, and the setting means sets the larger ToS value as a result of the comparison by the comparison means.

  In addition, the present invention drives the first VoIP-TA of a communication network system in which a first VoIP-TA (terminal adapter) that communicates using the VoIP protocol and a second VoIP-TA are connected. In the program, the first VoIP-TA is allowed to constantly monitor the arrival time of the voice packet transmitted from the second VoIP-TA, and from the normal arrival interval time, which is the time that the voice packet should arrive When it is confirmed that the delay has occurred, the ToS value, which is a value indicating the transmission priority of the voice packet to the second VoIP-TA transmitted by the first VoIP-TA, is incremented.

  Further, the present invention drives the second VoIP-TA of the communication network system in which the first VoIP-TA (terminal adapter) that communicates using the VoIP protocol and the second VoIP-TA are connected. In the program, when a voice packet in which a ToS value, which is a value indicating a transmission priority, is incremented from the first VoIP-TA is received by the second VoIP-TA, the first VoIP-TA The ToS value of the voice packet being sent to the voice packet is compared with the ToS value of the voice packet received from the second VoIP-TA, and as a result of the comparison, the voice sent by the second VoIP-TA The ToS value having the larger ToS value of the packet is set.

  According to the present invention, since the voice packet delay is monitored and the priority is increased, the priority can be raised only in an environment where the voice packet delay occurs.

  Furthermore, since the present invention uses only the minimum necessary protocol for realizing VoIP, it is possible to improve the voice quality in VoIP without implementing a special protocol.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing a configuration of a communication network system as an embodiment of the present invention.

  In FIG. 1, a VoIP (Voice over Internet Protocol) -TA (terminal adapter) 200 as a first VoIP-TA and a VoIP-TA 400 as a second VoIP-TA indicate the arrival time and transmission priority of a voice packet. The ToS (type of service) value, which is the indicated value, is monitored, the ToS value of the voice packet to be transmitted is adjusted, and the delay time of the voice packet is reduced.

  The telephone 100 and the telephone 500 are general analog telephones and do not have a VoIP function.

  The VoIP-NW (network) 30 is an Internet including a server having a call control function for VoIP such as a SIP (Session Initiation Protocol) server, and has a voice packet routing function in addition to call control.

  In FIG. 1, the VoIP-TA 200 constantly monitors the arrival time of the voice packet transmitted from the VoIP-TA 400. When it is confirmed that the VoIP-TA 200 is delayed from the normal arrival interval time, the VoIP-TA 200 increments the ToS value of the voice packet to the VoIP-TA 400 transmitted by the VoIP-TA 200.

  Next, when the VoIP-TA 400 receives the voice packet with the incremented ToS value from the VoIP-TA 200, the VoIP-TA 400 receives from the VoIP-12 the ToS value of the voice packet that the VoIP-TA 400 is currently sending to the VoIP-TA 200. The ToS value of the voice packet is compared, and the larger ToS value is set as the ToS value of the voice packet transmitted from the VoIP-TA 400 thereafter.

  In this way, since the priority of the delayed voice packet is increased without implementing a special protocol, it is possible to reduce the delay in the VoIP network of the voice packet that requires real-time characteristics.

  FIG. 2 is a diagram showing a basic protocol stack of VoIP-TA 200 and 14 according to the present embodiment.

  The hierarchy that implements the functions of the present invention is VoIP 210.

  The layers below TCP 220 or UDP 230 are the same as TCP / IP used in the Internet.

  FIG. 3 is a block diagram showing a module configuration of the VoIP shown in FIG.

  3, the VoIP 210 includes a call control unit 211, an RTP module 212, a CODEC module 213, an arrival time monitoring unit 214, and a priority control unit 214.

  The call control unit 211 is a module that performs call control for VoIP such as SIP.

  The RTP module 212 generates a voice packet based on the voice data generated by the CODEC module 213 and passes it to the lower layer, and converts the voice packet received from the lower layer into voice data and passes it to the CODEC module 213. Realized. Further, the RTP module 212 has a function of notifying the arrival time monitoring unit 214 of the time when the voice packet is received and a function of notifying the priority control unit 214 of the ToS value of the received voice packet.

  The CODEC module 213 encodes the voice data received from the telephone 100 or the telephone 500 and passes it to the RTP module 212, and also decodes the voice data received from the RTP module 212 and passes it to the telephone 100 or the telephone 500. The CODEC module 213 is a G. Satisfies standards such as 711.

  The arrival time monitoring unit 214 includes a T1 timer that measures the arrival time of each voice packet, and a T2 timer that measures the time that the delay continues after confirming the delay of the arrival voice packet. The arrival time monitoring unit 214 also has a function of comparing a preset voice packet arrival time with the time notified from the RTP module 212, and during the predetermined voice packet delay duration, When a delay is confirmed in the packet arrival time, the priority control unit 214 is notified that the delay is continuing.

  The priority control unit 214 receives a notification from the arrival time monitoring unit 214 that the delay of the voice packet is continued, or the ToS value of the received voice packet notified from the RTP module 212 is the ToS of the voice packet currently being transmitted. If it is confirmed that the value is larger than the value, the RTP module 212 is instructed to increase the ToS value of the voice packet to be transmitted.

  FIG. 4 is a flowchart showing an operation of transmitting a voice packet by VoIP.

  In FIG. 4, the RTP module 212 receives the voice packet from the lower layer and notifies the arrival time monitoring unit 214 that the voice packet has been received (step S1). The arrival time monitoring unit 214 that has received the notification confirms whether or not the T1 timer is activated (step S2). If the T1 timer has not been started (step S2 / Yes), the T1 timer is started (step S12).

  If the T1 timer has been started (step S2 / No), the voice packet arrival time (X) is compared with the T1 timer value (step S3). As a result of the comparison, if the T1 timer value is equal to or less than the estimated arrival time (X) of the voice packet (step S3 / Yes), after initializing T2, the T1 timer is initialized (step S11), and the T1 timer is started again (step S11). Step S12).

  If the T1 timer value is larger than the estimated time (X) of arrival of the voice packet (step S3 / Yes) and the T2 timer is not started (step S4 / Yes), the T2 timer is started (step S10) and the voice packet delay continues. Time (Y) is compared with the T2 timer value (step S5).

  If the T2 timer is activated (step S4 / No), the voice packet delay duration (Y) is compared with the T2 timer value (step S5).

  As a result of the comparison, if the T2 timer value is equal to or shorter than the voice packet delay duration (Y) (step S5 / Yes), the T1 timer is initialized (step S11), and the T1 timer is started again (step S12).

  If the T2 timer value is larger than the voice packet delay duration (Y) (step S5 / No), the priority control unit 214 is notified (step S6), the T1 timer and the T2 timer are initialized (step S7), and the T1 timer is again set. Start up.

  FIG. 5 is a flowchart showing the operation of the priority control unit 214.

  As shown in FIG. 5, when receiving the notification from the arrival time monitoring unit 214 (step S21), the priority control unit 214 compares the maximum ToS value (Z) with the current ToS value (step S22). As a result of the comparison, if the current ToS value is equal to the maximum ToS value (Z) (step S22 / No), no operation is performed. If the current ToS value is smaller than the maximum ToS value (Z) (step S22 / Yes), the ToS value is incremented (step S23) and notified to the RTP module 212 (step S24). Receiving the notification, the RTP module 212 increments the ToS value of the IP header when transmitting a voice packet thereafter.

  It is assumed that the ToS value once increased does not decrease while the call continues. In this way, it is possible to make the call connection destination recognize the voice packet delay.

  FIG. 6 is a flowchart showing an operation in which the VoIP-TA receives a voice packet.

  As shown in FIG. 6, the RTP module 212 receives the voice packet from the lower layer and notifies the priority control unit 214 of the ToS value (step S31). Upon receiving the notification, the priority control unit 214 compares the current ToS value with the ToS value received from the RTP module 212 (step S32).

  As a result of the comparison, if the ToS value notified from the RTP module 212 is greater than the current ToS value (Yes in step S32), the current ToS value matches the ToS value notified from the RTP module 212. (Step S33) and notify the RTP (step S34).

  As a result of the comparison, if the ToS value notified from the RTP module 212 is smaller than the current ToS value (step S32 / No), the process ends.

  Thereafter, a voice packet having an IP header including the increased ToS value is transmitted. In this way, the delay of the voice packet can be reduced by notifying the delay of the voice packet from the call connection destination using the ToS value increase as a means.

[Other Embodiments of the Invention]
As another embodiment of the present invention, the basic configuration is as described above, but when the delay of the voice packet is significant, the voice packet delay is promptly performed by incrementing the ToS value twice. Further devised to reduce time.

  FIG. 7 is a flowchart showing the operation by VoIP of this embodiment.

  In FIG. 7, the RTP module 212 receives the voice packet from the lower layer and notifies the arrival time monitoring unit 214 that the voice packet has been received (step S41). The arrival time monitoring unit 214 that has received the notification confirms whether the T1 timer is activated (step S42).

  If the T1 timer is not activated (step S42 / Yes), the T1 timer is started (step S45). If the T1 timer has been started (step S42 / No), the voice packet arrival scheduled time (X) is compared with the T1 timer value (step S43).

  As a result of the comparison, if the T1 timer value is equal to or less than the estimated arrival time (X) of the voice packet (step S43 / Yes), the T1 timer is initialized (step S44), and the T1 timer is started again (step S45).

  If the T1 timer value is larger than the expected voice packet arrival time (X) (step S43 / No), the difference time between the T1 timer value and the expected packet arrival time (X) is stored as the voice packet delay time (step S46). If the timer is not started, the T2 timer is started (step S47), and the voice packet delay duration (Y) is compared with the T2 timer value (step S48).

  As a result of the comparison, if the T2 timer value is equal to or shorter than the voice packet delay duration (Y) (step S48 / Yes), the T1 timer is initialized (step S44), and the T1 timer is started again (step S45).

  If the T2 timer value is larger than the voice packet delay duration (Y) (step S48 / No), the voice packet allowable delay time (V) is compared with the voice packet delay time (step S49). If it is equal to or less than the allowable delay time (V) (No in step S49), the priority control unit 214 is notified to increment the ToS value (step S50).

  If the voice packet delay time is larger than the voice packet allowable delay time (V) (step S49 / Yes), a notification is made to increment the ToS value twice (step S51), the T1 timer is initialized (step S52), and T2 The timer is initialized (step S53), and the T1 timer is started again (step S54).

  FIG. 8 is a flowchart showing the operation of the priority control unit 214 of the present embodiment.

  As shown in FIG. 8, the priority control unit 214 that has received the notification compares the maximum ToS value (Z) with the current ToS value (step S61). As a result of the comparison, if the current ToS value is equal to the maximum ToS value (Z) (step S61 / Yes), no operation is performed. If the current ToS value is smaller than the maximum ToS value (Z) (step S61 / No), the ToS value is set once or twice so as not to exceed the maximum ToS value (Z) according to the instruction from the arrival time monitoring unit 214. Increment (step S62) and notify the RTP module 212 (step S63).

  If the current ToS value becomes larger than the maximum ToS value (Z) by incrementing twice, the increment is performed once and notified to the RTP module 212. Receiving the notification, the RTP module 212 increments the ToS value of the IP header when transmitting a voice packet thereafter.

  It is assumed that the ToS value once increased does not decrease while the call continues. In this way, it is possible to make the call connection destination recognize the voice packet delay.

  As described above, according to the present embodiment, when the delay of the voice packet is significant, an effect is obtained that the delay time of the voice packet can be quickly reduced by incrementing the ToS value twice.

It is a block diagram which shows the structure of the communication network system as one embodiment of this invention. It is a figure which shows the basic protocol stack of VoIP-TA200 and 14 of embodiment of FIG. It is a block diagram which shows the module structure of VoIP shown in FIG. It is a flowchart which shows the operation | movement which transmits a voice packet by VoIP. 5 is a flowchart showing the operation of a priority control unit 214. It is a flowchart which shows the operation | movement which VoIP-TA receives a voice packet. It is a flowchart which shows the operation | movement by VoIP of other embodiment of this invention. It is a flowchart which shows operation | movement of the priority control part 214 of embodiment of this invention.

Explanation of symbols

100 telephone 200 VoIP-TA
300 VoIP-NW
400 VoIP-TA
500 Telephone 210 VoIP
211 Call control unit 212 RTP module 213 CODEC module 214 Arrival time monitoring unit 215 Priority control unit

Claims (6)

In a communication method of a communication network system in which communication is performed in a network system to which a first VoIP-TA (terminal adapter) that performs communication using VoIP and a second VoIP-TA are connected,
The first VoIP-TA constantly monitors the arrival time of the voice packet transmitted from the second VoIP-TA,
When it is confirmed that the first VoIP-TA is delayed from the normal arrival interval time, which is the time that the voice packet should arrive, the second VoIP-TA sent by the first VoIP-TA. Increment the ToS value, which is the value indicating the priority of sending voice packets to the TA,
When the second VoIP-TA receives the voice packet with the incremented ToS value from the first VoIP-TA, the ToS value of the voice packet sent to the first VoIP-TA And the ToS value of the voice packet received from the first VoIP-TA, and the larger ToS value is set to the ToS value of the voice packet transmitted by the second VoIP-TA. A communication method for a communication network system. In a communication network system in which a first VoIP-TA (terminal adapter) that performs communication using the VoIP protocol and a second VoIP-TA are connected,
The first VoIP-TA has means for constantly monitoring the arrival time of the voice packet transmitted from the second VoIP-TA;
Means for incrementing a ToS value, which is a value indicating a transmission priority of a voice packet to the second VoIP-TA transmitted by the first VoIP-TA,
The second VoIP-TA is a means for comparing the ToS value of the voice packet transmitted to the first VoIP-TA with the ToS value of the voice packet received from the second VoIP-TA. When,
And a means for setting the ToS value of the voice packet transmitted by the second VoIP-TA, wherein the normal monitoring means is a time during which the voice packet should arrive. When confirming that the delay is further, the increment means increments,
When the second VoIP-TA receives the voice packet with the incremented ToS value from the first VoIP-TA, the comparison unit performs comparison, and the setting unit compares the voice packet with the comparison unit. As a result, the larger ToS value is set. In the first VoIP-TA of the communication network system in which the first VoIP-TA (terminal adapter) that performs communication using the VoIP protocol and the second VoIP-TA are connected,
Means for constantly monitoring the arrival time of a voice packet transmitted from the second VoIP-TA;
Means for incrementing a ToS value, which is a value indicating a transmission priority of a voice packet to the second VoIP-TA transmitted by the first VoIP-TA,
A first VoIP-TA in which the increment means performs an increment when the constantly monitoring means confirms that the voice packet is delayed from a normal arrival interval time which is a time that the voice packet should arrive. . In the second VoIP-TA of the communication network system in which the first VoIP-TA (terminal adapter) that performs communication using the VoIP protocol and the second VoIP-TA are connected,
Means for comparing a ToS value, which is a value indicating a transmission priority of a voice packet transmitted to the first VoIP-TA, and the ToS value of a voice packet received from the second VoIP-TA;
And a means for setting the ToS value of the voice packet transmitted by the second VoIP-TA,
When the voice packet in which the ToS value is incremented is received from the first VoIP-TA, the comparison unit performs comparison, and the setting unit compares the larger one as a result of the comparison by the comparison unit. The second VoIP-TA, wherein a ToS value is set. In a driving program for driving the first VoIP-TA of a communication network system in which a first VoIP-TA (terminal adapter) that communicates using the VoIP protocol and a second VoIP-TA are connected,
Causing the first VoIP-TA to constantly monitor the arrival time of the voice packet transmitted from the second VoIP-TA;
The transmission priority of the voice packet to the second VoIP-TA sent by the first VoIP-TA when it is confirmed that the voice packet is delayed from the normal arrival interval time, which is the time that the voice packet should arrive The ToS value, which is a value indicating the above, is incremented. In the drive program for driving the second VoIP-TA of the communication network system in which the first VoIP-TA (terminal adapter) that communicates using the VoIP protocol and the second VoIP-TA are connected,
When a voice packet having an incremented ToS value indicating a transmission priority is received from the first VoIP-TA to the second VoIP-TA, the voice packet is transmitted to the first VoIP-TA. The ToS value of the voice packet being compared with the ToS value of the voice packet received from the second VoIP-TA,
As a result of the comparison, the driving program causes the ToS value of the voice packet transmitted by the second VoIP-TA to have a larger ToS value.

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