CN1416232A - Method for controlling service priority for tunneling data packet in general packet wireless service - Google Patents

Abstract

The invention discloses a method for controlling the priority of tunnel data packets in general packet wireless services. The method comprises: classifying received general packet wireless service tunnel protocol data packets, and separating T-PDU data packets, message packets and error packets; Indicate the data packet; process the message packet with the highest priority and put it into the highest priority queue; check the forwarding context of the T-PDU data packet to obtain its pre-agreed priority; filter the error indication data packet and press a certain Proportional processing, the rest discarded. The method can carry the GPRS tunnel protocol control plane and user plane data on the same interface board, and can ensure high priority and high reliability of the GPRS tunnel protocol control plane data. Even when there is a data storm, the control plane data will still be received in time and processed reliably while the user plane data will be discarded according to the priority from low to high.

Description

Tunnel data packet service priority control method in general packet radio service

technical field

The invention relates to a code division multiple access mobile communication system, in particular to a method for controlling the service priority of a tunnel data packet in a general packet radio service (GPRS).

Background technique

The concept of Quality of Service (QOS) is widely used in existing communication technologies, and it is mainly proposed for services carried by communication devices without involving the control message flow of the communication devices themselves. This is inseparable from the physical separation of control messages and user plane service data in traditional communication protocols, and the control message flow can be transmitted on the highest priority bearer link. But in GPRS Tunneling Protocol protocol, because it is a tunneling protocol, its transmission bears the weight of in UDP/IP (User Datagram Protocol/Internet Protocol) network and makes the above-mentioned quality of service control method have the following problems:

1. If the control plane data of the GPRS Tunneling Protocol and the user plane data are processed on the same interface, the reliability of the control plane messages is reduced because the priority guarantee is not performed on the control plane messages of the GPRS Tunneling Protocol. When the equipment is overloaded, a large amount of data loss on the control plane will greatly degrade the service quality of the serving General Packet Radio Service Support Node (SGSN).

2. If a dedicated interface device is used to process control plane data, since the control plane data flow is not large, and the existing interface device has a strong processing capability, the use efficiency of the interface device will be reduced.

3. If the error indication message in the user plane data cannot be separated, processing the error indication message will occupy a large amount of device resources. In this way, when a large number of error indication messages are sent under certain conditions such as restarting of the peer device, the local SGSN device will collapse due to exhaustion of resources.

Contents of the invention

Aiming at the problems existing in the above-mentioned service quality control method, the present invention provides a tunnel data packet service priority control method in general packet radio service, which is simple and easy to implement, and can improve the stability and efficiency of equipment. When the device receives abnormal messages or data storms from the backbone network, it can ensure the normal operation of the system under the processing pressure much greater than the full load of the system, and ensure that business messages and high-priority data packets are not lost.

In order to solve the above problems, the tunnel data packet service priority control method in the general packet radio service adopted by the present invention is carried out as follows:

a. Classify the received GPRS Tunneling Protocol packets, and separate out T-PDU packets, message packets and error indication packets;

b. Process the message packet with the highest priority and put it into the highest priority queue;

c. Check the forwarding context of the T-PDU data packet to obtain its pre-agreed priority;

d. Filter the error indication data packets, process them according to a certain ratio, and discard the rest.

In the step b, when processing the message packets with the highest priority, all message packets should be processed.

In the step c, when checking the data packets, merge the data packets into the corresponding queue according to the priority and store the fast index key together for reprocessing, if the processing capacity is close to overload, the priority is from high to low Drop packets.

In the step d, when filtering the error indication data packets, filter according to the proportion of 10%.

When processing data packets, they are processed in batches from high priority to low priority.

When processing data packets in batches, the number of data packets processed each time needs to be determined according to the processing capability and scheduling method of the system.

Owing to having adopted above-mentioned control method, the present invention has following advantage:

1. The GPRS Tunneling Protocol control plane and GPRS Tunneling Protocol user plane data can be carried on the same interface board, and can ensure high priority and high reliability of the GPRS Tunneling Protocol control plane data. Even when there is a data storm, the control plane data will still be received in time and processed reliably while the user plane data will be discarded according to the priority from low to high.

2. When a storm of error indication messages occurs, a large number of error indication messages are filtered so that normal business messages and data can be processed.

3. The inexhaustible bandwidth and processing capacity of the GPRS Tunneling Protocol control plane messages can be allocated to the GPRS Tunneling Protocol user plane for use, thereby improving the utilization efficiency of equipment.

Description of drawings

FIG. 1 is a schematic diagram of a simplified model for quality of service (QOS) capability analysis.

Detailed ways

The guiding idea of the tunnel data packet service priority control method in the general packet radio service of the present invention is to control the message of the control plane of the general packet radio service tunneling protocol and the non-T-PDU (GTP-U data) of the user plane of the general packet radio service tunneling protocol. The payload in the packet (that is, the payload in the GPRS Tunneling Protocol User Plane Protocol packet) is pre-analyzed so that it can be controlled together with the T-PDU packet to enhance the quality of service by adding a small amount of system processing. The performance of the system, the specific steps are as follows,

a. Classify the received GPRS Tunneling Protocol data packets, separate the T-PDU data packets, message packets and error indication data packets, and use the key characteristic value to identify or directly analyze the message type in the data packet during the classification Character.

b. Process the message packet with the highest priority and put it into the highest priority queue. When the dynamic resource control reserves enough bandwidth for the processing of the message packet, the processing of the message packet will not be affected by the external data storm. Usually when the processing load of the dynamic reporting message is A% (100% is the maximum value), the dynamic resource control part will automatically adjust the number of user accesses to ensure that the bandwidth of A%*0.2 is reserved for the processing of message packets,

When A%*1.2>80%, the dynamic resource control part will perform load sharing on message processing.

The premise of the above processing is to track the running state of the SGSN system through the service priority control method.

c. Check the forwarding context of the T-PDU data packet to obtain its pre-agreed priority.

d. Filter the error indication data packets, process them according to a certain ratio, and discard the rest.

In the step b, when processing the message packets with the highest priority, all message packets should be processed.

In the step c, when checking the data packets, merge the data packets into the corresponding queue according to the priority and store the fast index key together for reprocessing, if the processing capacity is close to overload, the priority is from high to low Drop packets.

Please refer to Figure 1, the analysis of QOS based on BUFFER operation is as follows:

The GTP tunnel protocol processing system can analyze the probabilistic scheduling of IP and QOS queues. In the above model, packet loss will occur in the QOS queue, 2/3 of the data packets will be discarded, and 1/3 of the data packets will be forwarded. The maximum QOS capability of the system is when the processing capacity reaches 150%, 1/3 of the Grohe priority data packets are forwarded, and assuming that the processing load of IP queue + interrupt processing is A%, and the processing load of QOS queue is B%, each The normal capacity of the second processing is T packets, and it is guaranteed that the high-priority data packets that account for C% of the total number of packets will not be lost, then:

Press T*S/(T+T*(1-S)*B/A)＝C+100 to get:

The number of packets processed by QOS each time:

QOS.perien＝T*C(A+B)/(100A+C*B)

The number of IP queues processed each time:

IP.perien＝T*(1+(100-C)/(100*A/B+C)

When C=100, QOS.perlen=T, IP.perlen=T

When C=1, QOS.perlen=T*(A+B)/(100A+B)

IP.perlen＝T*(1+99/(100*A/B+1))＜100T

When C=0, QOS.perlen=0

IP.perlen=T*(1+A/B)

That is, according to the proportion of different high-priority packets: 0<QOS.perlen<=T, T<=IP.perlen<=T*(1B/A)

Then the load that the system can bear is (1+100-C)/(100*A/B+C)100% of the processing capacity

There is a premise here, that is: the amount of interrupt processing each time is the same as the IP queue processing. This is mainly based on the fact that if the processing volume of interrupt processing is less than that of IP queue processing each time, the system will start to lose packets before the system is fully loaded. Packet loss, and random packet loss that has not been analyzed by QOS is the best choice at the bottom layer. Therefore, the processing volume of interrupt processing is designed to be the same as that of IP queue processing. According to the method of designing the cache, when the data packets received by the system are overloaded, the additional processing load added by the SGSN system is minimal.

It can be seen from the above analysis that the larger the B/A is, the better the QOS priority performance is, in fact, the more controllable resources are. That is to say, the sooner the QOS is controlled, the better. According to the above system model, it can bear 150% of the system load under the premise of ensuring 1/3 of the high-priority data packets of the traffic, and the effect is very good.

Therefore, processing through this step will greatly enhance the priority processing guarantee capability of the SGSN system for high-priority data packets. The same effect will be obtained when we integrate message processing.

In the described step d, when the error indication data packet is filtered, it is filtered by a ratio of 10%, so that when the error indication suddenly doubles the existing flow, and the system load does not exceed 150%, the normal operation of the SGSN system Processing will not be affected.

After adding the characteristic bit in the identification of the data packet, the illegal data packet can also be filtered out like an error indication.

When processing data packets, they are processed in batches from high priority to low priority.

When processing data packets in batches, the number of data packets processed each time needs to be determined according to the processing capability and scheduling method of the system.

In summary, the present invention has the following advantages:

The GPRS Tunneling Protocol control plane and GPRS Tunneling Protocol user plane data can be carried on the same interface board, and can ensure high priority and high reliability of the GPRS Tunneling Protocol control plane data. Even when there is a data storm, the control plane data will still be received in time and processed reliably while the user plane data will not be discarded. That is, according to the simplified model and analysis of the above-mentioned QOS capability analysis, it can be known that:

When the GPRS Tunneling Protocol control plane data packets account for 10% of the total data packets, the system can withstand a data storm with a system load of 180%.

When the GPRS Tunneling Protocol control plane data packets account for 30% of the total data packets, the system can withstand a data storm of 150% system load.

And the usual system design, the performance is about 20% higher than the model.

When a storm of error indication messages occurs, a large number of error indication messages are filtered so that normal business messages and data can be processed. That is, according to the above analysis results, considering the filtering of error indication messages, taking A/B=1/2, then: when the system receives normal business messages and error indication messages with the same speed of data, and the system load reaches 150%, normal Business messages and data packets can still be processed without loss.

The inexhaustible bandwidth and processing capacity of the GPRS Tunneling Protocol control plane messages can be distributed to the GPRS Tunneling Protocol user plane for use, improving the utilization efficiency of the tunneling protocol processing equipment.

Claims (6)

1. A tunnel packet service priority control method in GPRS, characterized in that, the control method is carried out as follows: a. Classify the received GPRS Tunneling Protocol packets, and separate out T-PDU packets, message packets and error indication packets; b. Process the message packet with the highest priority and put it into the highest priority queue; c. Check the forwarding context of the T-PDU data packet to obtain its pre-agreed priority; d. Filter the error indication data packets, process them according to a certain ratio, and discard the rest. 2. The method for controlling the priority of tunnel data packets in general packet radio services according to claim 1, characterized in that: in the step b, when the message packets are processed with the highest priority, all message packets should be processed deal with. 3. The method for controlling the priority of tunnel data packets in general packet radio services according to claim 1, characterized in that: in the step c, when inspecting the data packets, the data packets are merged into Corresponding queues store the fast index keys together for further processing. If the processing capacity is close to overload, the data packets are discarded according to the priority from high to low. 4. The method for controlling the priority of tunnel data packet service in general packet radio service as claimed in claim 1, characterized in that: in the step d, when filtering the error indication data packet, it is performed in a ratio of 10%. filter. 5. The method for controlling the priority of tunnel data packets in GPRS according to claim 3, characterized in that: when processing data packets, the processing is performed in batches from high priority to low priority. 6. The method for controlling the priority of tunnel data packets in general packet wireless services as claimed in claim 5, characterized in that: in carrying out batch processing of data packets, the number of data packets processed each time needs to be based on the processing capacity of the system and scheduling method to decide.