CN1324839C - Method for processing pocket service in soft exchange network - Google Patents

Abstract

The invention discloses a method for processing packet services in a softswitch network. The method comprises: a service carrying unit monitors the total service quality parameters of the carried packet service flow; the service carrying unit reports the monitoring result to a service control unit; The control unit controls the flow of the packet service according to the quality of service reflected by the monitoring result. The present invention can control the flow of the packet service according to the packet service quality carried by the service bearing unit, thereby ensuring the service quality of some packet services.

Description

A Processing Method for Packet Service in Softswitch Network

technical field

The invention relates to the service quality control technology in the soft exchange network, in particular to a method for processing the packet service in the soft exchange network to improve the quality of the packet service.

Background technique

The softswitch network is a network established using softswitch technology, in which the key softswitch devices are media gateway (MGW, Media Gateway) and media gateway controller (MGC, Media GatewayController). The MGW, as the bearer device for voice services, multimedia services, and narrowband data services, completes the service flow format conversion and bearer processing functions between different networks; the MGC is a core device independent of the transport network, and mainly completes call control, resource allocation, protocol Processing, routing, authentication, billing and other main functions, and can provide users with all services that existing circuit switches can provide.

FIG. 1 is a schematic diagram of device connection in a softswitch network. Referring to FIG. 1 , MGW1 and MGW2 are media gateways of both sides of service communication, carrying at least one service call, and each service call corresponds to a service channel for use by the service call. The MGC can be a softswitch server (SoftswitchServer), a mobile switching center server (MSC Server), a next-generation network server (NGNServer), or a similar mobile switching center (MSCe).

In different softswitch systems, the MGC corresponds to different devices, and the communication protocols between each softswitch device are different. For example, in the wideband code division multiple access (WCDMA) system, the MGC is the MSC The Nb protocol communicates, the MGW and the MSC Server communicate through the Mc protocol, and the MGCs communicate through the Nc protocol. Another example is in the CDMA2000 system, the MGC is MSCe, the MGW communicates through the YYp protocol, the MGW and MSCe communicate through the 39 protocol, and the MSCes communicate through the ZZp protocol. The MGW can also perform service communication with other devices (such as packet service equipment, circuit service equipment, etc.). If the MGW performs service communication with the packet service equipment, the MGW bears the packet service.

When a softswitch network uses packets to carry service flows, due to insufficient MGW resources, insufficient data bandwidth, and data damage, the service quality of packet services carried between two MGWs will deteriorate, such as high packet loss rate, large delay, Vibration is frequent. At this time, if the softswitch device does not control the flow of the service flow, the quality of service (QoS) of all services cannot be guaranteed.

In the prior art, only a scheme of quality alert (Quality Alert) and quality alert stop (Quality Alert Cease) is disclosed in International Telecommunication Union (ITU) H.248, which is used for changing the quality of service flow between MGW pairs. When the time is poor, an alarm will be issued.

However, in the prior art, there is no technical solution for flow control when the service quality of packets carried between MGW pairs deteriorates. Once the packet service quality between MGW pairs becomes poor, the service quality of all packet services cannot be guaranteed, especially the real-time packet service with high service quality requirements.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method for processing packet services in a softswitch network, which controls the flow of packet services according to the packet service quality carried by the service bearing unit, thereby ensuring the service quality of some packet services.

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

The media gateway monitors the carried packet service flow according to the instruction, records the total quality of service parameters including the effective bandwidth of the packet service, and reports the total service quality parameter including the effective bandwidth of the packet service to the media gateway controller; the media gateway controller according to The effective bandwidth determines the number of effective channels that can currently be carried, and judges whether the total number of current service channels is greater than the number of effective channels, and when the total number of service channels is greater than the number of effective channels, the number of service channels is controlled .

Another embodiment technical scheme of the present invention is:

The media gateway monitors the carried packet service flow according to the instruction, and records the total service quality parameter of the packet service; the media gateway reports the total service quality parameter to the media gateway controller; according to the total service quality preset in the media gateway controller The threshold value of the parameter determines whether flow control is required, and when flow control is required, the required bandwidth of the service channel is reduced.

The present invention also discloses two embodiments applied to the mobile softswitch, which are respectively stated as follows.

The technical solution of one of the embodiments is applied in a mobile softswitch communication system including a mobile service switching center server MSCServer and a media gateway MGW, wherein the mobile service switching center server is used for call control and protocol processing, and the media gateway completes the inter-network service flow format Conversion and bearer processing, including the steps: the media gateway monitors and records the total service quality parameters of the packet service according to the instructions; the media gateway reports the total service quality parameters to the MSC Server; the MSC Server judges the current service quality according to the total service quality parameters Whether to decline; when the quality of service declines, the MSC Server controls the packet service flow carried by the media gateway.

The technical solution of another embodiment is applied in a mobile softswitch communication system including a mobile switching center MSCe and a media gateway MGW, wherein the mobile switching center is used for call control and protocol processing, and the media gateway completes the inter-network service flow format conversion and Bearer processing, including the steps: the media gateway monitors and records the total service quality parameters of the packet service according to the instructions; the media gateway reports the total service quality parameters to MSCe; the MSCe judges whether the current service quality is degraded according to the total service quality parameters; when When the service quality drops, the MSCe controls the packet service flow carried by the media gateway.

Since the method of the present invention monitors the service quality of the packet service flow by the service bearing unit, reports the monitoring result to the service control unit, and the service control unit controls the flow of the packet service according to the monitoring result, so it can ensure that some packet services (especially service The quality of the packet service with higher quality requirements). Especially when the service quality deteriorates, the flow of some packet services can be limited by limiting the total number of service channels and reducing the required bandwidth of service channels, so as to improve the quality of some packet services.

In addition, since the method of the present invention only transforms local softswitch equipment (MGC and MGW), it does not need the cooperation of the entire softswitch network or other softswitch equipment, so it can reduce the number of existing softswitches while ensuring the quality of packet service. There is a network impact, reducing the cost of network upgrades.

Description of drawings

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

Fig. 2 is a flow chart of processing packet services in the softswitch network according to the present invention.

Detailed ways

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

Referring to Fig. 1, when the MGW carries the packet service flow, the service quality of the packet service carried between MGW1 and MGW2 will deteriorate due to reasons such as insufficient MGW resources, insufficient data bandwidth, and data damage. 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 to it, and the MGC controls the flow of the packet service carried by the MGW.

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

Step 201, the MGW monitors the total service quality parameters of the carried packet service flow;

In this step, the MGW can monitor the service quality of all the service channels carried; or, only monitor the service quality of some service channels carried by the MGW. Here, since one MGW can communicate with multiple other MGWs (including This MGW belongs to other MGWs within the jurisdiction of the MGC, and this MGW belongs to other MGWs outside the jurisdiction of the MGC) to form MGW pairs for communication. Each MGW pair formed by this MGW and other MGWs may carry multiple packet services channel, so here you can monitor 1 to N service channels among the multiple service channels carried by each MGW pair, where N is an integer greater than or equal to 1; as for which service channel to monitor specifically, 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 Hc interface, instructing the MGW to monitor the service channel; or the service channel to be monitored is determined by the MGW, and the service channel identifier to be monitored is pre-configured In MGW.

Here, the content of monitoring the service quality of each service channel to be monitored is: the service quality parameters of the service channel, such as: packet loss rate, delay, jitter, effective bandwidth of packet service, or any of the above four The combination is monitored and recorded at any time; wherein, the MGW can represent the effective bandwidth of the packet service by recording the number of effective net bytes received. Specific methods for monitoring the packet loss rate, delay, jitter, and effective bandwidth can use existing known monitoring methods, which will not be repeated here.

In order to determine the total service quality parameters of the packet service flow, it is necessary to sample the service quality parameters of each service channel monitored to obtain the total service quality parameters that can reflect the service quality status of the packet service flow carried by the MGW, including the overall For 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 flow limitation are performed for the packet service flow carried by each MGW pair. Therefore, the overall QoS parameter here refers to the overall QoS parameter of a packet service carried by an MGW.

In step 202, the MGW reports a service quality report to the MGC through the Hc interface. The service quality report adopts the format of the Hc interface message and includes the monitoring result of step 101.

A specific reporting method here is timing reporting: a timer is preset in the MGW, and a QoS report is reported every timing period according to a preset time interval.

Another specific reporting method is triggered reporting, which can also be called an alarm method: the threshold value of the monitored total quality of service parameters is preset in the MGW (for example, the quantization gate of packet loss rate, delay, and jitter can be set. limit value), and compare the monitored total service quality parameter with the threshold value corresponding to the parameter in real time. When the monitored service quality parameter reaches its corresponding threshold value, it is determined that the current service quality is degraded and trigger Submit a quality of service report to alert the MGC. The threshold value here can be one or multiple graded threshold values, that is, the service quality level threshold value. When the monitored service quality reaches a certain threshold value, the corresponding level will be triggered to be reported. The quality of service report, which carries the corresponding quality of service 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 quality of service parameters, 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%.

Apparently, the present invention can also divide service quality warning levels into multiple levels according to delay or jitter parameters.

The above-mentioned alarm method is to directly set the threshold value for the parameters of the total quality of service, and the present invention can also use the existing comprehensive determination method to synthesize in real time according to the parameters such as packet loss rate, delay, and jitter in the monitored total quality of service parameters. Determine the Qos value that reflects the quality of service. Here, the method for comprehensively determining Qos disclosed by ITU-T P.861 can be used. The threshold value of Qos is preset in the MGW, and the determined Qos value is compared with the corresponding Qos threshold value in real time. Values are compared, when the Qos value reaches its corresponding threshold value, a QoS report is triggered; similar to the packet loss rate above, multiple levels of Qos thresholds can also be set here, when the monitored Qos When the value reaches a certain threshold value, a QoS report of the corresponding level is triggered to be reported, which carries the corresponding alarm level information.

In step 203, the MGC controls the flow of the packet service carried by the MGW according to the quality of service status reflected in the monitoring result reported by the MGW.

There are several specific ways to control the flow in this step:

The first flow control method: if the monitoring result reported by the MGW includes effective bandwidth, calculate and determine the number of effective channels that can currently be carried according to the effective bandwidth. The calculation method is: divide the current effective bandwidth by the coding bandwidth of the current service, The obtained value is the number of effective channels, and the service encoding bandwidth can be pre-set in the MGC; for example: when the effective bandwidth reported in the MGW service quality report is 27600kpbs, and the current service is a voice service, G.729 encoding (one The data packet contains voice data of 20 ms), and the encoding bandwidth of G.729 is 27.6 kbps, so the number of effective channels is 27600/27.6=1000. After determining the number of effective channels, the MGC judges whether the total number of current service channels (the total number of service channels is recorded in the MGC) is greater than the number of effective channels, and if so, restricts the service channels of some packet services so that the current total service channels The number is equal to or less than the number of effective channels, thereby controlling the service flow; otherwise, the number of service channels is not controlled. The restriction method is: rejecting the establishment of new service channels; or pre-setting the priority of each service channel in the MGC, when the service quality deteriorates, closing the service channel with lower priority.

The second flow control method: preset the corresponding relationship between the alarm level and the restriction ratio of the service channel in the MGC. The restriction 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 alarm does not restrict access to service channels;

Level 1 alarm restricts the access of service channels accounting for 5% of the total number of service channels;

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

Level 3 alarm restricts access to service channels accounting for 40% of the total number of service channels;

Level 4 alarm restricts access to service channels that account for 70% of the total number of service channels;

Level 5 alarms restrict access to service channels that account for 90% of the total number of service channels.

If the service quality report reported by the MGW includes alarm level information, the MGC queries the corresponding relationship between the alarm level and the service channel restriction ratio, determines the service channel restriction ratio corresponding to the reported alarm level, and uses this ratio for the current access Service channels are restricted to improve the service quality of the MGW.

The third flow control method: preset the threshold value of the monitored total quality of service parameter in the MGC, the setting method here is the same as the threshold value of the total service quality parameter set in the MGW above; when the MGC receives the MGW report After the total service quality parameter is calculated, the total service quality parameter is compared with the corresponding threshold value of the parameter. When the monitored service quality parameter reaches its corresponding threshold value, it is determined that the current service quality is deteriorating, according to The preset service channel restriction ratio limits the currently accessed service channel.

Same as the MGW above, the threshold value here can be one or multiple graded threshold values. When the total service quality parameters received by the MGC reach the range of a certain threshold value, the The level of the threshold value is used as the level of the current quality of service; in the case of setting multiple quality of service level thresholds, it is also necessary to pre-set the corresponding relationship between the quality of service level and the service channel restriction ratio in the MGC to determine the current quality of service level Afterwards, the corresponding relationship is queried, the service channel restriction ratio corresponding to the current service quality level is determined, and the currently accessed service channel is restricted according to the ratio.

Or, the MGC comprehensively determines the Qos value reflecting the service quality according to the packet loss rate, delay, jitter and other parameters in the total service quality parameters in the service quality report, and presets one or more Qos threshold values in the MGC, Compare the determined Qos value with the corresponding Qos threshold value in real time, and when the Qos value reaches its corresponding threshold value, limit the currently accessed service channel according to the preset service channel limit ratio; the same as above Setting the Qos threshold value in MGW is similar. You can also set multiple levels of Qos threshold values here. When it is determined that the Qos value reaches a certain threshold value, the level of the threshold value will be used as the current service The level of quality, and query the corresponding relationship between the preset quality of service level and the service channel restriction ratio in the MGC, determine the service channel restriction ratio corresponding to the current service quality level, and use this ratio to restrict the currently accessed service channel.

The fourth flow control mode: according to the monitoring results in the service quality report, it is judged whether the service quality status is degraded, and if it is degraded, the required bandwidth of the service channel is reduced.

Same as the third flow control method, the threshold value of the monitored total quality of service parameter can be preset in the MGC, and when the MGC receives the total service quality parameter reported by the MGW, the total service quality parameter corresponds to the parameter Compared with the threshold value, when the monitored service quality parameter reaches its corresponding threshold value, it is determined that the current service quality status has declined. Or, comprehensively determine the Qos value reflecting the service quality according to the packet loss rate, delay, jitter and other parameters in the total service quality parameters in the service quality report, and preset a Qos threshold value in the MGC, and judge by the Qos value Whether the current service quality status is degraded.

Here, the way to reduce the bandwidth required by the service channel is to encode the services in the service channel by using a coding method that occupies less bandwidth than the original coding method. For example, suppose that in the voice service, the original voice service channel uses G.711 coding. When the service quality deteriorates, other voice codes such as G.729 and AMR that occupy a small bandwidth are used for coding, which can effectively reduce the cost of the service channel. The required bandwidth is improved to improve the service quality of the packet service carried by the MGW. Or, reduce the required bandwidth of the service channel by reducing the code rate. For example, when using AMR code, the code rate can be 4.75kbps~12.2kbps, including 4.75, 6.7, 7.4, 12.2 and other code rates. Alternatively, the bandwidth required by the service channel can also be reduced by increasing the packet size. For example, voice units of different durations such as 10ms, 20ms, and 30ms are used for packaging. As the packet size in the data packet increases, the number of packets decreases. Therefore The number of headers is reduced, which reduces the occupied bandwidth.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person familiar with the technology can easily think of changes or replacements within the technical scope disclosed in the present invention. , should be covered within the protection scope of the present invention.

Claims (11)

1, in a kind of flexible exchanging network to the processing method of Packet Service, it is characterized in that, comprise step:

Media gateway is according to the packet traffic flows that command monitoring carried, and record comprises total QoS parameter of Packet Service effective bandwidth, and the described total QoS parameter of Packet Service effective bandwidth that comprises is reported to Media Gateway Controller; Media Gateway Controller is determined the current effective port number that carries according to described effective bandwidth, and judge that whether current service channel sum is greater than described effective port number, when described service channel sum during, then the service channel number is controlled greater than described effective port number.

2, in the flexible exchanging network according to claim 1 to the processing method of Packet Service, it is characterized in that:

Media gateway regularly reports described total QoS parameter according to predefined timer, and perhaps the threshold value according to default total QoS parameter triggers, and reports described total QoS parameter.

3, in the flexible exchanging network according to claim 2 to the processing method of Packet Service, it is characterized in that:

When reporting total QoS parameter according to default threshold value triggering, described total QoS parameter carries the alarm class information;

When media gateway need be controlled the service channel number, according to the corresponding relation of described alarm grade and service channel restriction proportion limit service port number in proportion.

4, in the flexible exchanging network according to claim 1 to the processing method of Packet Service, it is characterized in that: when Media Gateway Controller need be controlled the service channel number, the foundation of refusal new business passage or close the lower service channel of priority.

5, in a kind of flexible exchanging network to the processing method of Packet Service, it is characterized in that, comprise step:

Media gateway is according to the packet traffic flows that command monitoring carried, and the total QoS parameter of record Packet Service; Media gateway reports to Media Gateway Controller with described total QoS parameter; Judge whether that according to the threshold value that is preset in the total QoS parameter in the Media Gateway Controller needs carry out flow control, when needs carry out flow control, realize flow control by reducing the required bandwidth of service channel.

6, method according to claim 5, it is characterized in that, the professional code check of operation code in the coded system littler than original coded system occupied bandwidth, the reduction service channel or the grouping dimension of increase grouping busihess data bag of adopting in the service channel come by the coded system that business adopted in the transformation service passage, realize flow control by reducing the required bandwidth of service channel.

7, in a kind of flexible exchanging network to the processing method of Packet Service, be applied to comprise in the mobile soft switching communication system of mobile services switching centre server MSC Server or class moving exchanging center MSC e, media gateway MGW, wherein mobile services switching centre server or class mobile switching centre are used for calling out control and protocol processes, media gateway is finished the conversion of inter-network traffic stream format and carrying is handled, it is characterized in that, comprise step:

Media gateway is according to instruction, and monitoring is also write down the total QoS parameter of Packet Service; Media gateway reports to MSC Server or MSCe with described total QoS parameter; MSC Server or MSCe judge according to described total QoS parameter whether the current service quality descends; When descending appearred in service quality, MSC Server or MSCe controlled the Packet Service flow that this media gateway is carried.

8, method according to claim 7 is characterized in that, comprises step:

Media gateway regularly reports or reports by the threshold value triggering that is preset in the media gateway, and described total QoS parameter is sent to MSC Server or MSCe.

9, method according to claim 7 is characterized in that, comprises step:

When total QoS parameter that media gateway reported comprised effective bandwidth, MSC Server or MSCe determined the current effective passage that carries and judge whether that needs carry out flow control according to described effective bandwidth; When needs carried out flow control, MSC Server or MSCe refused the foundation of new business passage or close the lower service channel of priority; Perhaps

When total QoS parameter that media gateway reported comprised warning information, MSC Server or MSCe inquired about the corresponding relation of described warning information and service channel restriction proportion, limit the service channel of current access in proportion.

10, method according to claim 7 is characterized in that, comprises step:

After described MSC Server or MSCe receive total QoS parameter of medium gateway to report, judge according to the threshold value that is preset among MSC Server or the MSCe whether current business service quality descends; When service quality descends, limit the service channel of current access or reduce the required bandwidth of service channel according to current service credit rating corresponding service aisle limit ratio, thereby realize flow control.

11, method according to claim 10 is characterized in that, comprises step:

The professional code check of operation code in the coded system littler than original coded system occupied bandwidth, the reduction service channel or the grouping dimension of increase grouping busihess data bag of adopting in the service channel reduced the required bandwidth of service channel.

Images