CN100401842C - Identification method of stream service - Google Patents

Abstract

The invention discloses a stream service identification method. The method comprises: a wireless network controller measures the throughput of an _Iups interface connected to a core network, and then judges whether the throughput of the _Iups interface is stable. If the throughput is stable , it is judged that the current service is a streaming service; otherwise, it is judged that the current service is not a streaming service. In the present invention, by measuring the throughput of the _Iups interface in the RNC, it is judged whether the throughput is stable, and if the throughput is stable, it is judged that the current service is a flow service, thereby identifying whether the current service is a flow service, and realizing In order to identify the streaming service in the UTRAN; the present invention also determines the streaming service by combining the upper layer application protocol, RLC buffer and the relationship between the air interface bandwidth and the average throughput, further increasing the accuracy of identifying the streaming service.

Description

Identification method of stream service

technical field

The invention relates to the technical field of data transmission of the third generation mobile communication system, in particular to a method for identifying stream services.

Background technique

The most notable new feature of the third-generation mobile communication system is that it can support higher service bit rates, and can allocate reasonable transmission bearers according to the specific service quality (Quality of Service, QoS) requirements of the service to meet its corresponding QoS requirements . The data transmission business in the 3G system can be divided into four types according to the QoS requirement: Conversational business, flow business, interactive business and background business. Among them, the session service requires a certain transmission bandwidth and has high requirements for data transmission delay, which is mainly used to carry voice, videophone, etc.; the streaming service has high requirements for data transmission delay and transmission bandwidth, and is mainly used to carry streams. Multimedia services; interactive and background services do not require high latency and transmission bandwidth, and are mainly used to carry services such as web browsing, Email, and background downloading. From the characteristics of the above four services and the service sources they carry, it can be seen that the streaming service has high real-time requirements and a guaranteed bandwidth requirement.

In the 3GPP protocol, the basic network composition for realizing the interactive or background services and streaming services in the above services is shown in Figure 1, in which the terminal is connected to the base station (NodeB) through the air interface, and the radio network controller (RNC) connected to the base station is connected to the base station through the Iups The interface is connected to the core network of the universal mobile communication system, connected to the Internet through the core network, and establishes a connection with the content server through the Internet; through these connections, the terminal can interact with the content server and establish services to obtain data on the content server.

In the network shown in Figure 1, the process of establishing radio bearers for interactive services and background services is shown in Figure 2, and the specific steps are as follows:

Step 201, before the terminal initiates a service request, the PDP context needs to be activated, that is, a PDP context activation request is sent to the core network;

Step 202, after the core network receives the PDP context activation request from the terminal, it will judge whether the request carries a QoS attribute parameter, if there is a QoS attribute parameter, execute step 204; otherwise execute step 203;

Step 203, the core network obtains the QoS attribute parameter customized by the user in the user subscription information from the home location register (HLR), and then executes step 204;

Step 204, when the core network returns the PDP context activation request, it sends the QoS attribute parameter to the RNC, and then the RNC establishes a radio bearer for the terminal according to the QoS attribute parameter.

In the above process, there is no requirement for guaranteed bandwidth in the QoS attribute parameters reported by the terminal or customized. However, since there is no requirement for guaranteed bandwidth in the interactive and background services, after the process in Figure 2 is executed, if the service initiated by the terminal is an interactive or background service, the wireless bearer established in the above step 204 can be directly Upload business. However, if the service initiated by the terminal is a streaming service, the streaming service has the requirement of guaranteed bandwidth, and the wireless bearer established directly according to the QoS attribute parameters reported by the terminal or customized cannot meet the transmission quality requirements of the streaming service, so in the 3GPP protocol In, the following provisions are made:

After the QoS attribute parameters of the streaming service are sent to the terminal by the content server of the streaming service, the terminal notifies the core network; after the core network obtains the QoS attribute parameters, it sends the QoS attribute parameters required by the streaming service to the RNC, and then the RNC Re-establish the radio bearer for the streaming service according to the QoS attribute parameter. The flow service wireless bearer establishment process is shown in Figure 3, and the steps are as follows:

Step 301, the terminal sends a stream service establishment request message to the content server of the stream service;

Step 302, after receiving the request message, the content server sends the session description protocol (Session Description Protocol, SDP) file of the streaming service to the terminal, which includes the QoS attribute parameters of the streaming service;

Step 303, the terminal analyzes the SDP file, obtains the QoS attribute parameters therein, and then reports the QoS attribute parameters to the core network;

Step 304, after the core network receives the Qos parameter reported by the terminal, it sends a streaming service radio bearer establishment request to the RNC, notifying the RNC to set up a radio bearer for the streaming service, and the request message includes the QoS attribute parameters of the streaming service;

Step 305: After receiving the radio bearer establishment request issued by the core network, the RNC learns that the service to be performed is a streaming service, and then establishes a radio bearer for the streaming service according to the QoS parameters of the streaming service in the request.

As can be seen from the process in Figure 3, 3GPP stipulates that terminals must have the function of analyzing SDP files and reporting the analyzed QoS attribute parameters to the core network. Only terminals with this function can perform streaming services Only then can a suitable radio bearer be established according to the QoS attribute parameters of the streaming service. However, in actual 3G services, many 3G terminals do not support the functions stipulated in the above-mentioned 3G protocol, that is, the terminals do not support the above-mentioned step 303, analyze the obtained SDP file, and send the QoS attribute parameter information therein to the core network; in this way, steps 304 and 305 cannot be performed, that is to say, the core network cannot notify the RNC to set up the flow service, nor can the QoS attribute parameters of the flow service be sent to the RNC, so that the flow service cannot be established. wireless bearer.

Although the RNC cannot re-establish a radio bearer for streaming services, since streaming services are almost always established on the basis of background services or interactive services, before executing the flow service establishment process in Figure 3, the terminal has already executed Figure 2 The procedure in the above is that the radio bearer has been established for the terminal, so the RNC can execute the streaming service on the radio bearer that has been established before performing the streaming service.

However, since the streaming service is directly performed on the radio bearer established for interactive or background services, the RNC cannot receive the streaming service radio bearer establishment request sent from the core network before performing the streaming service, and cannot know the currently transmitted radio bearer. The service is a streaming service, and the RNC cannot obtain the QoS attribute parameters of the streaming service. Since there is no guaranteed bandwidth in the QoS attribute parameters of the wireless bearer of the actual streaming service, when the network quality is found to be poor or the network resources are tight, the RNC will Reducing the bandwidth of the radio bearer may even directly release the service, which seriously affects the quality of the streaming service.

Contents of the invention

In view of this, the object of the present invention is to provide a method for identifying streaming services, which can identify streaming services as much as possible in the Universal Mobile Telecommunications System Terrestrial Radio Access Network (UTRAN).

In order to achieve the above purpose, the present invention provides four identification methods of stream services, which will be described respectively below.

The first method for identifying streaming services provided by the present invention includes:

A, the radio network controller measures the throughput of its _Iups interface connected to the core network;

B. Judging whether the throughput of the _Iups interface is stable, if the throughput is stable, it is judged that the current service is a streaming service; otherwise, it is judged that the current service is not a streaming service.

The step of described judging whether the _Iups interface throughput is stable can be:

Calculate the average and variance of the throughput of the Iu _ps interface, and then judge whether the ratio of the calculated variance to the average is smaller than a preset stable threshold, if yes, the throughput is stable; otherwise, the throughput is unstable.

Preferably, the value range of the stability threshold is: 1/10 to 1/4.

Further, after it is determined that the current service is a streaming service, it may include:

According to the throughput of the _Iups interface, the guaranteed bandwidth is set for the radio bearer transmitting the flow service.

The second stream service identification method provided by the present invention includes:

A, the radio network controller measures the throughput of its _Iups interface connected to the core network;

B, judge whether the throughput of the _Iups interface is stable, and whether the upper-layer application protocol of the current business is the TCP protocol, if the throughput is stable and the upper-layer application protocol of the current business is not the TCP agreement, then it is judged that the current business is a streaming service.

The step of described judging whether the _Iups interface throughput is stable can be:

Calculate the average and variance of the throughput of the Iu _ps interface, and then judge whether the ratio of the calculated variance to the average is smaller than a preset stable threshold, if yes, the throughput is stable; otherwise, the throughput is unstable.

Further, after it is determined that the current service is a streaming service, it may include:

According to the throughput of the _Iups interface, the guaranteed bandwidth is set for the radio bearer transmitting the flow service.

The third stream service identification method provided by the present invention includes:

A, the radio network controller measures the throughput of its _Iups interface connected to the core network;

B. Determine whether the throughput of the _Iups interface is stable, whether the upper layer application protocol of the current service is the TCP protocol, and whether the air interface bandwidth of the wireless bearer transmitting the current service is greater than the average throughput of the _Iups interface, if the throughput of the _Iups interface Stable, the upper-layer application protocol of the current service is the TCP protocol, and the air interface bandwidth of the wireless bearer transmitting the current service is greater than the average throughput of the _Iups interface, then it is determined that the current service is a streaming service.

The step of described judging whether the _Iups interface throughput is stable can be:

Calculate the average and variance of the throughput of the Iu _ps interface, and then judge whether the ratio of the calculated variance to the average is smaller than a preset stable threshold, if yes, the throughput is stable; otherwise, the throughput is unstable.

Further, after it is determined that the current service is a streaming service, it may include:

According to the throughput of the _Iups interface, the guaranteed bandwidth is set for the radio bearer transmitting the flow service.

The fourth stream service identification method provided by the present invention includes:

A, the radio network controller measures the throughput of its _Iups interface connected to the core network;

B. Determine whether the throughput of the _Iups interface is stable, whether the upper-layer application protocol of the current service is the TCP protocol, whether the air interface bandwidth of the wireless bearer for transmitting the current service is greater than the average throughput of the _Iups interface, and whether the wireless bearer for transmitting the current service is greater than the average throughput of the Iups interface. Check whether the link cache value is stable. If the throughput of the _Iups interface is stable, the upper-layer application protocol of the current service is the TCP protocol, and the air interface bandwidth of the wireless bearer transmitting the current service is not greater than the average throughput of the _Iups interface, and the wireless bearer of the current service is transmitted If the wireless link buffer value of the bearer is unstable, it is determined that the current service is a streaming service.

The step of described judging whether the _Iups interface throughput is stable can be:

Calculate the average and variance of the throughput of the Iu _ps interface, and then judge whether the ratio of the calculated variance to the average is smaller than a preset stable threshold, if yes, the throughput is stable; otherwise, the throughput is unstable.

The step of judging whether the radio link cache value for transmitting the current service radio bearer is stable may be:

Calculate the average value and variance of the wireless link control cache value, and judge whether the ratio of the calculated variance and the average value is less than the preset stability threshold, if yes, the wireless link control cache value is stable; otherwise, the wireless link cache value is not Stablize.

Further, after it is determined that the current service is a streaming service, it may include:

According to the throughput of the _Iups interface, the guaranteed bandwidth is set for the radio bearer transmitting the flow service.

As can be seen from the above technical solutions, in the present invention, by measuring the throughput of the _Iups interface in the radio network controller (RNC), it is judged whether the throughput is stable, and if the throughput is stable, it is judged that the current service is flow business, so as to realize the recognition of flow business in UTRAN;

In the present invention, by combining the judgment of whether the upper-layer application protocol is the TCP protocol, the non-streaming service that is caused by the TCP protocol to stabilize the flow is identified, which increases the accuracy of identifying the streaming service;

In addition, by combining the judgment of the relationship between the air interface bandwidth and the average throughput, the streaming service is identified, not only the non-streaming service whose upper-layer application protocol is TCP, but also the streaming service whose upper-layer application protocol is TCP protocol is also identified. Further increase the accuracy of identifying streaming services;

In addition, in the present invention, by combining the judgment of the wireless link cache value, the upper-layer application protocol is the TCP protocol, and the streaming service whose air interface bandwidth is not greater than the average throughput is identified, which further increases the accuracy of identifying the streaming service;

Furthermore, the present invention sets a guaranteed bandwidth for the wireless bearer transmitting the current service according to the throughput of the _Iups interface after identifying the streaming service, and ensures the transmission quality of the streaming service through the guaranteed bandwidth.

Description of drawings

Fig. 1 is a schematic diagram of network composition of the present invention;

Fig. 2 is the establishment flowchart of interactive service and background service wireless bearer;

Figure 3 is a flow chart for establishing a stream service radio bearer specified in the 3GPP protocol;

Fig. 4 is the general flowchart of the present invention;

Fig. 5 is a flowchart of the first embodiment of the present invention;

Fig. 6 is a flowchart of the second embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

The main idea of the present invention is to determine whether the currently transmitted service is a flow service by analyzing the characteristics of data transmission at the _Iups interface. Overall flow chart of the present invention is as shown in Figure 4, and concrete steps are as follows:

Step 401, RNC measures the throughput of the _Iups interface connected to the core network;

Step 402, judging whether the throughput of the _Iups interface is stable, if it is stable, it is judged that the current service is a streaming service; otherwise, it is judged that the current service is not a streaming service.

In the present invention, it can also be combined with whether the upper layer application protocol of the current service is the TCP protocol, whether the air interface bandwidth is greater than the throughput of the _Iups interface, and the judgment of the wireless link cache value for transmitting the current service, further increasing the identification flow service. accuracy.

The present invention is described below through specific examples.

In step 204 in Fig. 2, the QoS attribute parameter issued by the core network to the RNC will include the maximum bandwidth, and this maximum bandwidth is the maximum bandwidth available for the radio bearer. The allocated air interface bandwidth is usually the maximum bandwidth. This embodiment is performed when the air interface bandwidth actually allocated by the RNC for the radio bearer is the maximum available bandwidth, which will increase the accuracy of the measurement. However, the present invention can also be used when the bandwidth of the air interface does not reach the maximum available bandwidth, and this embodiment is only a preferred embodiment.

The flow chart of the first embodiment of the present invention is shown in Figure 5, and the specific steps are as follows:

Step 501, RNC judges whether the air interface bandwidth used by the current radio bearer is the maximum bandwidth available for the radio bearer, if so, execute step 502; otherwise, repeat this step;

Step 502, start the throughput measurement of the _Iups interface, and periodically count the throughput measurement results;

The throughput is the number of bits of all service data units (SDUs) received from the core network (CN) within a unit of time in the radio bearer. It is the most intuitive and accurate to count the throughput directly on the _Iups interface connecting the RNC to the CN accurately reflect the rate of the stream service; in this step, the throughput measurement of the _Iups interface can be realized by setting a throughput measurement module in the RNC in advance, after judging that the air interface bandwidth is the maximum bandwidth, the throughput measurement module That is, measure the number of service data unit (SDU) bits received from the core network at the _Iups interface, and calculate the number of bits received per unit time, obtain the throughput measurement result, and then periodically report the measurement result to the RNC. The report here The period can be in the range of 100ms to 5000ms;

Step 503, RNC calculates the average value of throughput according to the throughput measurement result, and calculates the variance, then judges whether the throughput is stable according to the average value and variance of the throughput, if the throughput is stable, perform step 504; otherwise, it means that the current business is not a stream business;

In this step, the average and variance of statistical throughput can be the average and variance of statistical throughput within a certain period of time. The period can be selected between 100ms and 5000ms, but the period should be greater than the reporting period in step 502. For example, statistics The period is an integer multiple of the reporting period; the method of judging whether the traffic is stable based on the average value and variance of the traffic is as follows: pre-set a judgment threshold for stable throughput, the threshold can be the ratio of the variance to the throughput, and the specific value can be In the range of 1/10 to 1/4; in this step, after calculating the ratio of the average throughput of the radio bearer to the variance, it is judged whether the ratio is less than the preset throughput stability decision threshold, if less than the threshold, it means that the current throughput is stable; otherwise, it means that the current throughput is unstable;

When it is determined that the throughput is unstable, it can be determined that the service is not a streaming service because the transmission of the streaming service is stable. And if the throughput is stable, it cannot be directly concluded that the service is a streaming service, because the throughput is stable, and it may also be caused by the adaptive bandwidth characteristics of the TCP protocol, so further judgment is required, that is, step 504 is executed; Adaptive bandwidth means that if the application layer uses the TCP protocol for data packet transmission, the protocol will automatically adjust the throughput to make the bandwidth used by the wireless bearer consistent with the air interface bandwidth allocated for the wireless bearer;

Step 504, RNC judges whether the protocol applied by the data packet transmitted in the radio bearer in the application layer is the TCP protocol, if it is the TCP protocol, execute step 505; otherwise, it can be judged that the service is a streaming service;

In this step, if it is determined that the protocol used by the data packet at the application layer is the TCP protocol, then the stable throughput may not be caused by the characteristics of the streaming service, but may also be caused by the bandwidth adaptive characteristics of the TCP protocol; And if it is judged that the protocol used by the application layer is not the TCP protocol, such as RTP protocol and UDP protocol, etc., because the non-streaming service will not cause obviously stable throughput, so if the throughput is stable, it can basically be judged that it is a streaming service. caused by the transmission characteristics;

Step 505, determine whether the air interface bandwidth of the current wireless bearer is greater than the throughput, if it is determined that the air interface bandwidth is greater than the throughput, then determine that the service is a streaming service; otherwise, the service is not a streaming service;

Because in step 504, it has been determined that the throughput is stable, and the protocol adopted by the application layer is the TCP protocol, because the adaptive characteristic of the TCP protocol is to adapt the throughput to the air interface bandwidth, so if the throughput is equal to the air interface bandwidth, then it can be judged The stable throughput is caused by the TCP protocol rather than the streaming service; if the air interface bandwidth is greater than the throughput, it means that the throughput is not adaptive to the air interface bandwidth, so the stable throughput at this time is caused by the streaming service Therefore, it can be judged that the service transmitted in the radio bearer is a stream service; in addition, the air interface bandwidth equal to the throughput mentioned in this step refers to the situation that the air interface bandwidth is basically equal to, that is, there is little difference, for example, the air interface bandwidth and throughput If the difference is less than 1/5, set the air interface bandwidth equal to the throughput; otherwise, if the difference is greater than 1/5, it means that the two are not equal.

The above is the description of the first embodiment of the present invention. In the first embodiment, whether the service transmitted in the radio bearer is a streaming service is identified by combining the throughput and the judgment of the protocol used by the application layer. In the first embodiment, when the application layer uses the TCP protocol and the throughput is stable and basically equal to the bandwidth of the air interface, it is determined that the service transmitted in the radio bearer is a streaming service. The throughput of service transmission is equal to the bandwidth of the air interface. In order to solve this problem, the TCP protocol and streaming services are further analyzed. Through the analysis, it is concluded that if the throughput is stable due to the TCP protocol, the radio link control cache value (RLC buffer) is stable; and if the throughput caused by streaming services is stable, even if the application layer uses the TCP protocol, the RLC buffer is also unstable. Therefore, in the second embodiment of the present invention, the RLC buffer is judged, which will be described below.

The process flow of the second embodiment of the present invention is shown in Figure 6, wherein steps 601 to 605 are basically the same as steps 501 to 505 of the first embodiment, except that after judging in step 605 that the bandwidth of the air interface is not greater than the throughput, further include:

Step 606, determine whether the radio bearer RLC buffer is stable, if the RLC buffer is stable, it means that the stable throughput is caused by the TCP protocol, so the current service is not a streaming service; otherwise, it means that the stable throughput is caused by the streaming service, So the current business is streaming business;

In this step, the method for judging whether the RLC buffer is stable can be: pre-set the RLC buffer stable threshold, the threshold can be the ratio of the RLC buffer variance and the RLC buffer average value, the same as the throughput stable threshold, the RLC buffer stable threshold can also be Take a value between 1/10 and 1/4, and then judge whether the ratio of the RLC buffer variance to the RLC buffer average value is less than the preset RLC buffer stability threshold. If it is less than the threshold, the RLC buffer is stable; otherwise, the RLC buffer is stable. unstable.

In the above two embodiments, after judging that the current service is a flow service, it may further include: setting a guaranteed bandwidth for the radio bearer of the current transmission flow service in the RNC, and the specific value of the guaranteed bandwidth is based on the throughput of the _Iups interface The amount can be set to be equal to or slightly greater than the current throughput. When the guaranteed bandwidth is set, for example, if the measured current throughput is 128Kbit/s, the bandwidth can be set to 144Kbit/s. After the guaranteed bandwidth is set, when the radio resource is tight and the RNC needs to reduce the bandwidth of some radio bearers, since the guaranteed bandwidth is set for the radio bearer, the air interface bandwidth of the radio bearer will not be reduced below the guaranteed bandwidth.

Since the judgment of the streaming service is based on the transmission characteristics, it can be judged whether the service is a streaming service as soon as the service is transmitted, and because the throughput of the _{Iups interface} is not affected by the wireless network when the streaming service is just started to be transmitted. The limitation of resource conditions is greater than the real guaranteed bandwidth of the streaming service, so setting the guaranteed bandwidth of the radio bearer as the throughput of the _Iups interface here ensures that the guaranteed bandwidth is greater than the real guaranteed bandwidth of the streaming service, so RNC according to this The guaranteed bandwidth is controlled so that the air interface bandwidth of the wireless bearer transmitting the streaming service is not less than the guaranteed bandwidth, so that the requirements of the streaming service can be met.

The above is the description of the specific embodiments of the present invention, and the method of the present invention can be appropriately improved during the specific implementation process to meet the specific needs of specific situations. Therefore, it can be understood that the specific implementation manners according to the present invention are only exemplary, and are not intended to limit the protection scope of the present invention.

Claims (7)

1. one kind is flowed professional recognition methods, it is characterized in that this method comprises:

A, radio network controller are to its Iu that links to each other with core network _PsThe throughput of interface is measured;

B, judgement Iu _PsWhether the throughput of interface is stable, if throughput is stable, judging current business is that stream is professional; Otherwise judge current business is not that stream is professional; Described judgement Iu _PsWhether interface throughput stabilizes to: calculate Iu _PsThe mean value of interface throughput and variance, whether the ratio of judging the variance calculate and mean value then is less than predefined stable thresholding, if then throughput is stable; Otherwise, the throughput instability.

2. method according to claim 1 is characterized in that, the span of described stable thresholding is: 1/10 to 1/4.

3. method according to claim 1 is characterized in that, step B is described judge throughput stable after, this method comprises:

Whether the upper layer application protocol of judging current business is Transmission Control Protocol, if not, then judging current business is that stream is professional.

4. method according to claim 3 is characterized in that, the described upper layer application protocol of judging current business is after the Transmission Control Protocol, and this method comprises:

Whether the bandwidth of air-interface of judging the radio bearer that transmits current business is greater than Iu _PsThe average throughput of interface, if greater than, then judging current business is that stream is professional.

5. method according to claim 4 is characterized in that, the bandwidth of air-interface of the radio bearer of described judgement transmission current business is not more than Iu _PsAfter the average throughput of interface, this method comprises:

Whether the Radio Link cache size of judging transmission current business radio bearer is stable, if unstable, then judging current business is that stream is professional.

6. method according to claim 1 is characterized in that, whether stable step is the Radio Link cache size of described judgement transmission current business radio bearer:

Calculate the mean value and the variance of Radio Link control cache size, whether the variance that judgement calculates and the ratio of mean value be less than predefined stable thresholding, if then Radio Link control cache size is stable; Otherwise Radio Link cache size instability.

7. according to arbitrary described method in the claim 1 to 6, it is characterized in that, described judge current business and be the stream business after, further comprise:

According to Iu _PsThe throughput of interface is provided with the guarantee bandwidth for the professional radio bearer of this stream of transmission.

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