WO2007012262A1

WO2007012262A1 - A method and device for implementing packet service in soft-switch network

Info

Publication number: WO2007012262A1
Application number: PCT/CN2006/001767
Authority: WO
Inventors: Jun Fang; Haopeng Zhu
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2005-07-27
Filing date: 2006-07-19
Publication date: 2007-02-01
Also published as: CN1324839C; CN101160792A; CN1825799A; CN101160792B

Abstract

A method for implementing packet service in soft-switch network includes: the service carrier unit monitors the total service quality parameter of the carried packet service flow; the service carrier unit reports the monitor report to the service control unit; the service control unit controls the runoff of the packet service according to the service quality status reflected by the monitoring result. The device for implementing packet service in soft-switch network includes: the monitor unit for monitoring the service quality parameter, the report unit for reporting the monitoring result, and the control unit for the runoff of the packet service. The runoff of the packet service can be controlled according to the packet service quality carried by the service carrier unit by using the invention, thereby the service quality of a part of packet service can be ensured.

Description

Method and device for processing packet service in softswitch network

Technical field

The present invention relates to a quality of service control technique in a softswitch network, and more particularly to a method and apparatus for processing packet services for improving the quality of packet services in a softswitched network. Background of the invention

Softswitch network is built using the network softswitch technology, which is a key softswitch media gateway (MGW, Media Gateway) and Media Gateway Controller (MGC, Media Gateway Controller) ₀ which MGW as voice services, multimedia services and narrowband The bearer device of the data service completes the service stream format conversion and bearer processing functions between different networks; the MGC is a core device independent of the transport network, and mainly performs call control, resource allocation, protocol processing, routing, authentication, billing, etc. The function can also provide users with all the services that the existing circuit switch can provide.

Figure 1 shows a device connection diagram of a softswitch network. Referring to Figure 1, MGW1 and MGW2 are media gateways of both parties of the service communication, carrying at least one service call, and each service call corresponds to one service channel for the service call. The MGC can be a Softswitch Server, a Mobile Switching Center Server (MSC Server), a Next Generation Network Server (NGN Server), or a Class Mobile Switching Center (MSCe).

In different softswitch systems, the MGC corresponds to different devices, and the communication protocols between the softswitch devices are different. For example, in a Wideband Code Division Multiple Access (WCDMA) system, the MGC is an MSC Server, and the MGW passes. b protocol communication,] VIGW communicates with MSC Server through Mc protocol, and MGC communicates through Nc protocol. In another example, in the CDMA2000 system, the MGC is the MSCe, the MGW communicates through the YYp protocol, and the MGW communicates with the MSCe through the 39 protocol, and the MSCe passes the ZZp. The protocol communicates. The MGW can also communicate with other devices (eg, packet service devices, circuit service devices, etc.). If the MGW performs service communication with the packet service device, the packet service is carried on the MGW.

When the softswitch network uses the packet to carry the service flow, the service quality of the packet service carried by the two MGWs is deteriorated due to insufficient MGW resources, insufficient data bandwidth, data corruption, etc., for example, the packet loss rate is high and the delay is large. Frequent jitter. At this time, if the softswitch device does not control the traffic of the service flow, the quality of service (QoS) of all services is not guaranteed.

In the prior art, only a Quality Alert and Quality Alert Cease scheme is disclosed in the International Telecommunications Union (ITU) H.248 for the quality of service flows between MGW pairs. When it is bad, an alarm is issued.

However, the prior art does not have a technical solution for performing flow control when the quality of packet services carried between MGW pairs is degraded. Once the quality of the packet service between the MGW pairs deteriorates, the quality of service of all packet services is not guaranteed, especially for real-time packet services with high quality of service requirements. Summary of the invention

In view of the above, the main object of the present invention is to provide a method and a device for processing a packet service in a softswitch network, and control the traffic of the packet service according to the packet service quality carried by the service bearer unit, thereby ensuring service of a part of the packet service. quality.

In order to achieve the above object, the technical solution of the present invention is:

A method for processing a packet service in a softswitch network, comprising:

The service bearer unit monitors the quality of service parameters of the carried packet north flow;

The service bearer unit reports the monitoring result to the service control unit;

The service control unit performs packet service based on the quality of service status reflected by the monitoring result. Traffic is controlled.

Preferably, the method for the service bearer unit to monitor the quality of service parameter of the carried packet service flow is: monitoring service quality parameters of all or part of service channels in the packet service flow, and monitoring the service channel of each The quality of service parameters are sampled to obtain the quality of service parameters of the packet service flow. The monitoring of the quality of service parameters of the service channel is: monitoring the packet loss rate, delay, jitter, effective bandwidth of the service channel, or any combination of the foregoing.

Preferably, the service bearer unit reports the monitoring result to the service control unit: using a timing report manner;

Or, in the manner of triggering reporting, setting a threshold of the quality of service parameter in the service bearer unit, and if it is determined that the monitored quality of service condition reaches the threshold, triggering the monitoring result.

Preferably, the controlling the traffic of the packet service according to the monitoring result is: calculating the current number of valid channels that can be carried according to the reported effective bandwidth of the packet service, and if the current total number of service channels is greater than the number of valid channels, the current total service channel The number is limited so that the current total number of service channels is equal to or less than the number of valid channels.

Preferably, the method further includes: the service bearer unit compares the monitoring result with a preset threshold value of the preset quality of service parameter, determines a current service quality level, and carries the current service in the reported monitoring result. Grade information of quality;

The service control unit controls the traffic of the packet service according to the monitoring result: querying the correspondence between the predetermined service quality level and the service channel restriction ratio, and determining the service channel restriction ratio corresponding to the currently reported service quality level, The number of currently accessed service channels is limited.

Preferably, the service control unit controls the traffic of the packet service according to the monitoring result, and compares the reported monitoring result with a preset service quality level threshold. Determining the current service quality level; querying the correspondence between the predetermined service quality level and the service channel restriction ratio, determining the service channel restriction ratio corresponding to the current service quality level, and limiting the number of currently accessed service channels by the ratio.

The above method for limiting the number of service channels is: rejecting the establishment of a new service channel, or turning off a service channel with a lower priority.

Preferably, the controlling the traffic volume of the packet service according to the quality of service status reflected by the monitoring result is: determining whether the service shield quantity status is decreased according to the monitoring result, and decreasing the bandwidth required by the service channel if decreasing. The method for reducing the bandwidth required by the service channel is: encoding the service in the service channel by using a coding mode smaller than the original coding mode, or reducing the code rate of the code, or increasing the packet size of the service.

The service bearer unit is a media gateway, and the service control unit is a media gateway controller.

A device for processing a packet service in a softswitch network, the device comprising: a monitoring unit, configured on a service bearer unit, configured to monitor a monthly quality parameter of the carried packet service flow;

The reporting unit is configured on the service carrying unit, and is configured to report the monitoring result of the monitoring unit to the service control unit;

The control unit is disposed on the service control unit, and is configured to control traffic of the packet service according to the service quality status reflected by the monitoring result.

Preferably, the monitored quality of service parameter is: a packet loss rate of the service channel, a delay, a jitter, an effective bandwidth, or any combination of the foregoing.

Preferably, the service bearer unit is a media gateway, and the service control unit is a media gateway controller.

Since the method of the present invention monitors the service quality of the packet service flow by the service bearer unit, the monitoring result is reported to the service control unit, and the service control unit performs the packet service according to the monitoring result. The traffic is controlled, so that the quality of some packet services (especially those with higher quality of service requirements) can be guaranteed. In particular, when the service volume is degraded, the traffic of some packet services can be restricted by limiting the total number of service channels and reducing the bandwidth required by the service channel, thereby increasing the shield capacity of some packet services.

In addition, since the method of the present invention only transforms the local softswitch equipment (MGC and MGW), without the cooperation of the all softswitch network or other softswitch equipment, the packet quality of service can be reduced while being guaranteed. Impact on existing networks reduces the cost of network upgrades. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic diagram of device connection of a softswitch network;

2 is a flowchart of processing a packet service in a softswitch network according to the present invention; and FIG. 3 is a schematic structural diagram of a device for processing a packet service in the softswitch network according to the present invention. Mode for carrying out the invention

Specific embodiments of the present invention will now be described with reference to the accompanying drawings.

Referring to Figure 1, when the MGW carries the packet service flow, the service quality of the packet service carried between the MGW1 and the MGW2 is deteriorated due to insufficient MGW resources, insufficient data bandwidth, and data corruption. Therefore, the present invention can monitor the service quality of the packet service flow on the MGW, and report the monitoring result to the MGC connected thereto, and the MGC controls the traffic of the packet service carried by the MGW.

2 is a flow chart of processing packet services in a softswitch network according to the present invention. Referring to Figure 2, the process includes:

Step 201: The MGW monitors a total service quality parameter of the carried packet service flow. In this step, the MGW can monitor the quality of service of all the service channels that are carried; or, only monitor the quality of service of the part of the service channels that are carried, where an MGW can be associated with multiple other MGWs (including The MGWs belonging to the MGCs and other MGWs within the jurisdiction of the MGCs are configured to communicate with each other to form an MGW pair. Each MGW pair of the MGW and other MGWs may carry multiple packet services. Channel, so here you can monitor 1 ~ N service channels in each of the multiple service channels carried in each MGW pair, where N is an integer greater than or equal to 1; as to which service channel is specifically monitored, it can be determined by the MGC. That is, when a service channel is connected, the MGC sends a service quality monitoring command to the MGW through the He interface, instructing the MGW to monitor the service channel; or the service channel to be monitored is determined by the MGW itself, and the service channel identifier to be monitored is pre-configured. In the MGW.

Here, the content of the service metrics of each service channel to be monitored is: QoS parameters for the service channel, such as: packet loss rate, delay, jitter, effective bandwidth of the packet service, or the foregoing four Any combination can be monitored and recorded at any time; wherein, the MGW can indicate the effective bandwidth of the packet service by recording the number of valid net bytes received. The specific monitoring method for monitoring the packet loss rate, delay, jitter, and effective bandwidth may be a well-known monitoring method, and will not be described here.

In order to determine the total quality of service parameters of the packet service flow, the quality of service parameters of the monitored service channels need to be sampled to obtain a total quality of service parameter that reflects the quality of service of the packet service flow carried by the MGW, including the overall Packet loss rate, delay, jitter, or effective bandwidth, the specific sampling method can use existing technology, for example, the sampling method disclosed in IETF RFC3550 can be used.

In this embodiment, the monitoring of the packet service flow and the traffic limitation are performed for each MGW paired packet traffic flow. Therefore, the total quality of service parameter here refers to the total service quantity parameter of an MGW to the carried packet service. Step 202: The MGW reports the QoS report to the MGC through the He interface, where the QoS report is in the format of the He interface message, and includes the monitoring result in step 201.

A specific reporting method is timing reporting: a preset timer is set in the MGW, and the quality of service is reported in each timing cycle according to a preset time interval.

Another specific reporting method is triggering reporting, which can also be called alarm mode:

The threshold value of the total quality of service parameter monitored by the MGW is preset (for example, a packetization rate, a delay, and a quantization threshold value of the jitter may be set), and the total service quality parameter to be monitored is thresholded corresponding to the parameter in real time. The value is compared. When the monitored quality of service parameter reaches its corresponding threshold, it determines that the current quality of service is degraded, and triggers reporting of the quality of service report to alert the MGC. The threshold value here may be one, or may be a plurality of hierarchical threshold values, that is, a service quality level threshold value, and when the monitored service quality reaches a certain threshold value, the corresponding level is triggered to be reported. The service quality report, which carries the corresponding service quality level information, that is, the alarm level information; for example: the quality of service alarm level can be divided into 0-5 levels according to the packet loss rate in the total service quality parameter, namely:

Level 0 alarm: 0 % < packet loss rate <2%;

Level 1 alarm: 2% < packet loss rate < 8%;

Level 2 alarm: 8% < packet loss rate <25%;

Level 3 alarm: 25% < packet loss rate <45%;

Level 4 alarm: 45% < packet loss rate <75%;

Level 5 alarm: 75% < packet loss rate <95%.

It will be apparent that the present invention can also classify quality of service alert levels into multiple levels based on delay or jitter parameters.

The foregoing alarm mode is to directly set a threshold value for the parameter of the total service quality, and the present invention can also integrate the existing comprehensive determination method according to parameters such as packet loss rate, delay, and jitter in the monitored total service quality parameter in real time. Determine the Qos value that reflects the quality of service, which can be taken here. Using the method of comprehensively determining Qos disclosed in ITU-T 861, the threshold value of Qos is preset in the MGW, and the determined Qos value is compared with the corresponding Qos threshold in real time, when the Qos value reaches its corresponding threshold. When the value is used, the service quality report is triggered. Similar to the packet loss rate mentioned above, multiple levels of Qos thresholds can also be set here. When the monitored Qos value reaches a certain threshold, the trigger is triggered. A service quality report corresponding to the level is reported, and the corresponding alarm level information is carried.

Step 203: The MGC controls the traffic of the packet service carried by the MGW according to the quality of service status reflected by the monitoring result reported by the MGW.

This method can control the traffic in the following specific ways:

The first type of flow control mode: if the monitoring result reported by the MGW includes the effective bandwidth, the number of valid channels that can be currently carried is determined according to the effective bandwidth calculation, and the calculation method is: dividing the current effective bandwidth by the coding bandwidth of the current service, The obtained value is the number of valid channels, and the service coding bandwidth may be preset in the MGC; for example: when the effective bandwidth reported in the MGW quality of service report is 27600 kpbs, and the current service is a voice service, using G.729 coding (a The packet contains 20ms of voice data. The G729 has a coded bandwidth of 27.6kbps, and the number of valid channels is 27600/27.6=1000. After determining the number of valid channels, the MGC determines whether the current total number of service channels (the total number of service channels is recorded in the MGC) is greater than the number of valid channels, and if so, restricts the service channels of some packet services, so that the current total service channel The number is equal to or less than the number of valid channels, thus controlling the traffic flow; otherwise, the number of service channels is not controlled. The limitation is as follows: rejecting the establishment of a new service channel; or pre-setting the priority of each service channel in the MGC type, and turning off the service channel with a lower priority when the service shield is worse.

The second type of traffic control mode: The correspondence between the preset alarm level and the service channel limit ratio in the MGC. The limit ratio of the service channel is the ratio of the number of restricted service channels to the total number of service channels. For example: Level 0 alarms do not restrict access to service channels;

Level 1 alarms limit access to service channels that account for 5% of the total number of service channels;

Level 2 alarms limit access to service channels that account for 20% of the total number of service channels;

Level 3 alarms limit the service channel access of 40% of the total number of service channels;

Level 4 alarms limit access to 70% of the total number of service channels;

Level 5 alarms limit the service channel access that accounts for 90% of the total number of service channels.

If the service quality report reported by the MGW includes the alarm level information, the MGC queries the correspondence between the alarm level and the service channel limit ratio, and determines the service channel restriction ratio corresponding to the reported alarm level, and the current access The service channel is restricted to improve the service quality of the MGW.

The third flow control mode is: preset the threshold value of the monitored total quality of service parameter in the MGC, where the setting method is the same as the above-mentioned threshold for setting the total quality of service parameter in the MGW; when the MGC receives the MGW report After the total quality of service parameter, the total quality of service parameter is compared with a threshold corresponding to the parameter, and when the monitored quality of service parameter reaches its corresponding threshold, the current quality of service is determined to be worse, according to The preset service channel restriction ratio limits the currently accessed service channel.

The same as the above MGW, the threshold value here may be one, or may be a plurality of hierarchical thresholds. When the total quality of service parameter received by the MGC reaches a certain threshold, the The level of the threshold is used as the current service quality level. In the case of setting multiple service quality level thresholds, the correspondence between the service quality level and the service channel restriction ratio must be preset in the MGC to determine the current service shield. After the level, the corresponding relationship is queried, and the service channel restriction ratio corresponding to the current service quality level is determined, and the currently accessed service channel is restricted by the ratio.

Alternatively, the MGC comprehensively determines the Qos value reflecting the quality of service according to the parameters such as the packet loss rate, delay, and jitter in the total quality of service parameter in the quality of service report, and presets in the MGC. The threshold value of one or more Qos is compared in real time with the determined Qos value and the corresponding Qos gate P艮 value. When the Qos value reaches its corresponding threshold value, the ratio is proportional to the preset service channel limit. The currently accessed service channel is restricted. Similar to the above, the Qos gate P艮 value is set in the MGW. Here, multiple levels of Qos thresholds can also be set. When it is determined that the Qos value reaches a certain threshold value. Then, the level of the threshold is used as the current quality of service level, and the correspondence between the preset service quality level and the service channel restriction ratio in the MGC is queried, and the service channel restriction ratio corresponding to the current service quality level is determined. The ratio limits the currently accessed service channel.

The fourth type of flow control method: According to the monitoring result in the service quality report, it is judged whether the service quality status is degraded, and if it is decreased, the bandwidth required for the service channel is reduced.

As in the third flow control mode, the threshold value of the monitored total quality of service parameter may be preset in the MGC. After the MGC receives the total service quality parameter reported by the MGW, the total service quality parameter is corresponding to the parameter. The 'threshold' is compared, and when the monitored quality of service parameter reaches its corresponding threshold, it determines that the current quality of service condition has decreased. Or, according to the packet loss rate, delay, jitter, and other parameters in the total quality of service parameter in the quality of service report, the Qos value reflecting the quality of service is comprehensively determined, and a threshold of Qos is preset in the MGC, and the Qos value is determined. Whether the current quality of service situation is declining.

Here, the manner of reducing the bandwidth required by the service channel is as follows: The service in the service channel is coded by using a coding mode that consumes less bandwidth than the original coding mode. For example, in the voice service, the original voice service channel uses G.711 encoding. When the quality of service deteriorates, other voice codes such as G.729, AMR, etc., which use less bandwidth, can be used to effectively reduce the service channel. The required bandwidth improves the quality of service of the packet services carried by the MGW. Or, reduce the bandwidth required by the service channel by reducing the code rate of the code. For example, AMR coding can use a code rate of 4.75 kbps to 12.2 kbps, including multiple code rates of 4.75, 6.7, 7.4, and 12.2. Alternatively, you can reduce the bandwidth required for the service channel by increasing the packet size. For example, packet units of different durations such as 10ms, 20ms, and 30ms are used for packetization. As the packet size in the data packet is longer, the number of packets is reduced, so the number of packet headers is reduced, so that the occupied bandwidth is reduced.

Based on the above disclosed method of the present invention, the present invention also discloses a processing apparatus for packet services in a softswitch network. Referring to FIG. 3, the apparatus includes:

a monitoring unit, configured on a service bearer unit (such as a media gateway), configured to monitor a quality of service parameter of the carried packet service flow;

The control unit is disposed on the service control unit (for example, the media gateway controller), and is configured to control the traffic of the packet service according to the quality of service status reflected by the reported monitoring result.

The monitored service quantity parameters are: packet loss rate, delay, jitter, effective bandwidth of the service channel, or any combination of the foregoing.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope of the present invention. All should be covered by the scope of the present invention.

Claims

Claim

A method for processing a packet service in a softswitch network, the method comprising:

The service bearer unit monitors the service quality parameter of the carried packet service flow; the service bearer unit reports the monitoring result to the service control unit;

The service control unit controls the traffic of the packet service according to the quality of service condition reflected by the monitoring result.

2. The method for processing a packet service in a softswitch network according to claim 1, wherein:

The method for the service bearer to monitor the quality of service parameters of the carried packet service flow is: monitoring the quality of service parameters of all or part of the service channels in the packet service flow, and serving the monitored service channels The parameters are sampled to obtain the quality of service parameters of the packet service flow.

3. The method for processing a packet service in a softswitch network according to claim 2, wherein:

The monitoring of the quality of service parameters of the service channel is: monitoring the packet loss rate, delay, jitter, effective bandwidth of the service channel, or any combination of the foregoing.

4. The method for processing a packet service in a softswitch network according to claim 1, wherein:

The service bearer unit reports the monitoring result to the service control unit:

Use the method of ^=艮 on the timing;

Or, in the manner of triggering the report, the threshold value of the service quality parameter is set in the service bearer unit. If it is determined that the monitored service quality condition reaches the threshold, the monitoring result is triggered.

5. The method for processing a packet service in a softswitch network according to claim 1, wherein:

The control of the traffic of the packet service according to the monitoring result is: calculating the current number of valid channels that can be carried according to the reported effective bandwidth of the packet service, and if the total number of current service channels is greater than the number of valid channels, limiting the current total number of service channels , so that the current total number of service channels is equal to or less than the number of valid channels.

6. The method for processing a packet service in a softswitch network according to claim 1, wherein:

The method further includes: the service bearer unit compares the monitoring result with a level threshold value of the preset quality of service parameter, determines a current service quality level, and carries the current service quality level information in the reported monitoring result. ;

7. The method for processing a packet service in a softswitch network according to claim 1, wherein:

The service control unit controls the traffic of the packet service according to the monitoring result: comparing the reported monitoring result with a preset service quality level gate P艮 value, determining the current service quality level; and querying the predetermined service quality. The correspondence between the level and the service channel restriction ratio determines the service channel restriction ratio corresponding to the current service quality level, and limits the number of currently accessed service channels.

8. A method of processing a packet service in a softswitch network according to claim 5, 6, or 7, characterized in that:

The method for limiting the number of service channels is: rejecting the establishment of a new service channel, or Turn off the lower priority service channel.

9. The method for processing a packet service in a softswitch network according to claim 1, wherein:

The controlling the traffic of the packet service according to the quality of service status reflected by the monitoring result is: determining whether the quality of service condition is degraded according to the monitoring result, and decreasing the bandwidth required for the service channel if decreasing. ·

10. The method for processing a packet service in a softswitch network according to claim 9, wherein:

The method for reducing the bandwidth required by the service channel is: encoding the service in the service channel by using a coding mode smaller than the original coding mode, or reducing the coded rate or increasing the packet size of the service.

The method for processing a packet service in a softswitch network according to claim 1, wherein the service bearer unit is a media gateway, and the service control unit is a media gateway controller.

12. A device for processing a packet service in a softswitch network, the device comprising:

a monitoring unit, configured on the service bearer unit, configured to monitor a quality of service parameter of the carried packet service flow;

The device for processing packet services in a softswitch network according to claim 12, wherein the monitored quality of service parameters are: packet loss rate, delay, jitter, effective bandwidth, or the foregoing Any combination of the four.

The device for processing a packet service in a softswitch network according to claim 12, wherein the service bearer unit is a media gateway, and the service control unit is a media gateway controller.