CN100388682C - Method for improving service quality in SGSN network processor - Google Patents
Method for improving service quality in SGSN network processor Download PDFInfo
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- CN100388682C CN100388682C CNB200510018410XA CN200510018410A CN100388682C CN 100388682 C CN100388682 C CN 100388682C CN B200510018410X A CNB200510018410X A CN B200510018410XA CN 200510018410 A CN200510018410 A CN 200510018410A CN 100388682 C CN100388682 C CN 100388682C
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Abstract
The present invention relates to a method for enhancing service quality in an SGSN network processor, which solves the problem of congestion of received queues and is mainly used for transmitting a plurality of currents with different priorities on a network. When a queue received by an ATM has light congestion, moderate congestion and severe congestion, transmission rates of services of the conversation class, the stream class, the interaction class and the background class respectively correspondingly adjust so as to reduce or avoid congestion. The present invention realizes the qos by using two cps, and a CPRC of each cp can realize the same qos function. A qos module is composed of a right value polling functional module, a packet integer functional module and a packet monitoring functional module; not only the packet monitoring function can be realized on the two cps of the qos, but also the GTPU_CP and the atm_cp have part of the packet monitoring function. A resource scheduling algorithm provided by the present invention can dynamically distribute network resources according to the current network situation so as to avoid network congestion.
Description
Technical field
The present invention relates to a kind of Qos (service quality) dispatching algorithm, be specifically related to a kind of Qos algorithm of on network processing unit, realizing SGSN (GPRS serving GPRS support node) user plane.
Background technology
GPRS (GPRS) serving GPRS support node is called SGSN, and it comprises all functions that can support GPRS.In a PLMN (Public Land Mobile Nerwork), have a plurality of SGSN.Its major function is that travelling carriage is carried out authentication and mobile management, carry out Route Selection, set up the transmission channel of travelling carriage to GGSN (gateway GPRS supporting node (GGSN)), receive the transparent mobile station data that transmits of base station sub-system, carry out passing to GGSN or reverse by the GPRS backbone network after the protocol conversion.
In order to realize certain network service quality, one has the attribute of clearly definition and the carrying service of function must be set up between the source and destination end of this service.
The UMTS of SGSN user plane (universal mobile telecommunications system) carrying service function comprises following several:
1) mapping function: the mapping between data cell and its corresponding Qos attribute is provided.
2) classification feature: if MT (portable terminal) has set up a plurality of UMTS carrying services, need, different data cells is distributed to corresponding UMTS carrying service according to corresponding Qos value.
3) resource management module: according to the value of Qos, the traffic assignments usable bandwidth resources for different outwards sends data.Employed mode is a queue scheduling, the weights control of Bandwidth Management and radio bearer.
4) traffic shaping: traffic shaping mainly is to guarantee that certain professional data transmits between total amount and the corresponding Qos to be consistent.It is mainly repaired and finishes by control or flow.Controlled function compares data cell flow and corresponding Qos attribute, will be thrown away or be labeled as with the unmatched data cell of Qos attribute not match, and under congested situation, preferentially throws away.The flow finishing forms the data cell flow according to the Qos attribute.The related algorithm of traffic shaping has token bucket algorithm
On the C5 network processing unit, congestedly refer to the congested of certain formation, in a formation descriptor of buffer memory reach certain degree (for example formation allow maximum descriptor number 80%), it is congested that we just say that this formation has occurred.The congested degree of formation is divided into four kinds: no congested, slightly congested, and the congested and heavy congestion of moderate.
Because network processing unit resource-constrained, therefore currently adopt simple discard algorithm when on network processing unit, realizing Qos usually, to abandon above the message of flow, though this simple algorithm has guaranteed at utmost to have reduced the resource consumption of network processing unit.But owing to abandoned corresponding user data, reduced the performance of system, can not satisfy the demand that the SGSN high-speed data is transmitted fully.
In order to improve the disposal ability of SGSN, need on network processing unit, realize a kind of simple algorithm of Qos, not only can satisfy the demand that SGSN transmits data at a high speed, different priority can be provided, and can reduce the unnecessary data packet loss.Therefore need this algorithm, both met the characteristics of network processing unit hardware, also can improve the performance of SGSN.
Summary of the invention
The purpose of this invention is to provide a kind of method of in the SGSN network processing unit, improving service quality, improve the performance of SGSN, avoid because the source number when constantly increasing, increases the weight of the unpredictability of Business Stream and sudden, cause resource contention in bottleneck, thereby cause network congestion.A kind of resource scheduling algorithm is provided, can be according to current network condition, the dynamic assignment Internet resources are avoided the congested of network.
Technical scheme of the present invention is: a kind of method of improving service quality in GPRS serving GPRS support node SGSN network processing unit, realize Qos with 2 channel processor cp, the cp reduced instruction set computer core CPRC of each cp realizes identical Qos function; The Qos module is made up of weights polling dispatching, bag shaping and three functional modules of bag monitoring; Wherein the bag monitoring is not limited only to realize on two cp of Qos, at the cp that handles GPRS Tunnel Protocol user plane GTPU, handles the function that also has the part bag to monitor on the cp of asynchronous transfer mode ATM;
Weights polling dispatching module is finished professional classification and scheduling, have 6 different formations of priority in this module: the conversation class formation, the stream Class Queue, 3 interactive class formations that priority is different, the background class formation, by these 6 formations of WRR mechanism poll, make the high service class of priority can be more processed;
The bag Shaping Module is finished the shaping of Business Stream: if conversation class and stream class, multiply by the token length that difference that the current time deducts the last bag transmitting time of this business is produced during this period of time with the transfer rate of current appointment, add the length of residue token then, obtain the length of current available token, if current available token length is then lost this bag less than the length of current data packet; If interactive class and background class, adopt identical method to calculate available token length, if current available token length less than the length of current data packet, the descriptor of this bag of buffer memory is to the end of this Class Queue so;
The bag monitoring module is used to avoid and handles congested;
It is characterized in that:
A) weights polling dispatching module
Have 6 different formations of priority in this module: the conversation class formation, the stream Class Queue, 3 interactive class formations that priority is different, the background class formation is used for the queuing of the packet of different Qos classify traffic;
Weights are given in each formation, and the accessed number of times of the formation that weights are high is some more; Press 6 formations of the continuous poll of weights, take out corresponding descriptor, descriptor is delivered to the bag Shaping Module of this cp;
The weights of 6 formations are conversation class formation-stream Class Queue-background class formation-interactive class formation 1-interactive class formation 2-interactive class formation 3 by descending being arranged in order;
B) bag Shaping Module
As keyword, look into the teid table with the teid in the descriptor (tunnel endpoint identifier), obtain the relevant Qos information of this bag according to checking result; Also should comprise 2 content: a, this professional time that sends bag of last time in each list item; Remained b, last time the length of token behind this professional transmission packet;
C) bag monitoring module
Monitor the length of the formation on each cp,, make no congested, the slightly congested still judgement of heavy congestion of congested, moderate, handle congested by following method according to the difference of Congestion Level SPCC according to the degree that the descriptor of buffer memory in the formation reaches:
Occur slightly when congested when ATM receives formation, the transmitted bit bit of conversation class and stream class service data flow leads and is reduced to maximum transmitted bit and leads and guarantee bit certain value between leading; The transmission bit of interactive class and background class traffic data flow leads and falls to such an extent that lead lowly than current transfer of data bit, perhaps reduces to 0;
When ATM receives formation moderate appears when congested, the transmission bit of conversation class and stream class service data flow leads and is reduced to maximum transmitted bit and leads and guarantee bit certain value between leading, this value than slight when congested in the value that is reduced to of conversation class and stream class service data flow lower; The transmission bit of interactive class and background class traffic data flow leads and also is reduced to certain value, and this value is also low than the slight value that interactive class and background class traffic data flow are reduced to when congested, perhaps reduces to 0;
When heavy congestion appears in ATM reception formation, the transmission bit of conversation class and stream class service data flow leads the assurance transmission bit that reduces to them and leads, and it is lower that the transmission bit of interactive class and background class traffic data flow leads the value that interactive class and background class traffic data flow are reduced to when falling more congestedly than moderate; Notify the access control module to stop entering of new business simultaneously; Still heavy congestion occurs if crossed a period of time ATM reception formation, notice Qos module is carried out the packet loss processing, takes the packet loss strategy of certain probability.
Aforesaid method of in the SGSN network processing unit, improving service quality, it is characterized in that: the weights of conversation class formation are 0.50, the weights of stream Class Queue are 0.30, the weights of background class formation are 0.10, the weights of interactive class formation 1 are 0.05, the weights of interactive class formation 2 are 0.03, and the weights of interactive class formation 3 are 0.02.
Beneficial effect
Owing to adopted foregoing method of improving service quality, can take different priority that it is handled at different Business Streams, and can the active balance offered load, improved the performance of SGSN,
Description of drawings
Fig. 1 is that the Qos of the embodiment of the invention handles structured flowchart.
Fig. 2 is the bag integer module flow chart of the embodiment of the invention.
Fig. 3 is the congested solution flow chart that the Qos of the embodiment of the invention receives formation.
Concrete execution mode
Below be specifying Qos technology implementation among the present invention in conjunction with the accompanying drawings.
Fig. 1 is the structured flowchart of whole module.The GTP-U packet is handled the back through GTP_U CP and is divided into 6 classes stream by content, and 6 formations of mailing to Qos cp by these 6 formations of WRR mechanism poll, make the high service class of priority can be more processed.Wrap the congestion condition that monitoring module monitors 6 formations simultaneously.
Fig. 2 is a bag integer module flow chart.Make corresponding processing respectively according to the Qos class under the current bag to be processed.
A) if conversation class and stream class, the length of residue token after then from checking result, obtaining the transmitting time of the last bag of this business and sending a last packet, multiply by the token length that difference that the current time deducts the last bag transmitting time of this business is produced during this period of time with the transfer rate of current appointment, add the length of residue token then, obtain the length of current available token, if current available token length is greater than the length of current data packet, (transfer rate of appointment is defaulted as maximum transfer rate, when atm takes place when congested, can not make according to congested degree and adjusting simultaneously, specifically see below the congested solution of ATM reception formation), then this bag corresponding descriptor is forwarded to corresponding cp (gbe, atm) formation on, send this bag, current available token length is deducted the length that length of data package obtains remaining token, and revise the content of this professional corresponding teid list item, transmitting time is revised as the current time, will remains token length and be updated to last look; If current available token length is then lost this bag less than the length of current data packet.
B) if interactive class, background class, the length of residue token after then from checking result, obtaining the transmitting time of the last bag of this business and sending a last packet, multiply by the token length that difference that the current time deducts the last bag transmitting time of this business is produced during this period of time with the transfer rate of current appointment, add the length of residue token then, obtain the length of current available token, if current available token length is greater than the length of current data packet, (transfer rate of appointment is defaulted as maximum transfer rate, when atm takes place when congested, can make different adjustment according to congested degree, specifically see below the congested solution of ATM reception formation), then this bag corresponding descriptor is forwarded to corresponding cp (gbe, atm) formation on, send this bag, current available token length is deducted the length that length of data package obtains remaining token, and revise the content of this professional corresponding teid list item, transmitting time is revised as the current time, will remains token length and be updated to last look; If current available token length is less than the length of current data packet, the descriptor of this bag of buffer memory is to the end of this Class Queue so, waits this descriptor to move on to after queue heads is removed, and repeats said process, and decision is to transmit or the continuation buffer memory.
Wherein the interactive class formation has 3 formations that priority is different, as when needing the descriptor of buffer memory interactive class, still descriptor is cached to its under the interactive class formation of priority.
Fig. 3 is the congested solution flow chart that ATM receives formation
Occur slightly when congested when ATM receives formation, the transmission bit of conversation class and stream class service data flow leads and is reduced to maximum transmitted bit and leads and guarantees certain value between leading of bit (for example lead for maximum transmitted bit/the 3+2* assurance transmits bit and lead/3); The transmission bit of interactive class and background class traffic data flow leads reduction (for example for original 2/3).
When ATM receives formation moderate appears when congested, the transmission bit of conversation class and stream class service data flow leads and is reduced to maximum transmitted bit and leads and guarantee bit certain value between leading, this value than slight congested in the value that is reduced to of conversation class and stream class service data flow lower (for example lead/3+ guarantees to transmit bit and lead/3) for maximum transmitted bit; The transmission bit of interactive class and background class traffic data flow leads also and reduces, this value also than slight congested in the value that is reduced to of interactive class and background class traffic data flow low (for example reduce to original 1/3).
When heavy congestion appears in ATM reception formation, the transmission bit of conversation class and stream class service data flow leads the assurance transmission bit that reduces to them and leads, the transmission bit of interactive class and background class traffic data flow lead fall than moderate congested in the value that is reduced to of interactive class and background class traffic data flow lower (for example for original 1/6), notify the access control module to stop entering of new business simultaneously, still heavy congestion occurs if (for example 1 minute) ATM that spent a period of time receives formation, notice Qos module is carried out packet loss and is handled. take the packet loss strategy (for example taking probability is 1/10 packet loss strategy) of certain probability.
Through after the congested control, if it is no longer congested that ATM reception formation continues for some time (for example 5 minutes), notice Qos modules A TM receives no longer packet loss of formation, recover conversation class, the stream class, it is initial value that the transmission bit of interactive class and background class traffic data flow leads, and notice access control modules A TM does not stop entering of new business.
Claims (2)
1. a method of improving service quality in GPRS serving GPRS support node SGSN network processing unit realizes Qos with 2 channel processor cp, and the cp reduced instruction set computer core CPRC of each cp realizes identical Qos function; The Qos module is made up of weights polling dispatching, bag shaping and three functional modules of bag monitoring; Wherein the bag monitoring is not limited only to realize on two cp of Qos, at the cp that handles GPRS Tunnel Protocol user plane GTPU, handles the function that also has the part bag to monitor on the cp of asynchronous transfer mode ATM;
Weights polling dispatching module is finished professional classification and scheduling, have 6 different formations of priority in this module: the conversation class formation, the stream Class Queue, 3 interactive class formations that priority is different, the background class formation, by these 6 formations of WRR mechanism poll, make the high service class of priority can be more processed;
The bag Shaping Module is finished the shaping of Business Stream: if conversation class and stream class, multiply by the token length that difference that the current time deducts the last bag transmitting time of this business is produced during this period of time with the transfer rate of current appointment, add the length of residue token then, obtain the length of current available token, if current available token length is then lost this bag less than the length of current data packet; If interactive class and background class, adopt identical method to calculate available token length, if current available token length less than the length of current data packet, the descriptor of this bag of buffer memory is to the end of this Class Queue so;
The bag monitoring module is used to avoid and handles congested;
It is characterized in that:
A) weights polling dispatching module
Have 6 different formations of priority in this module: the conversation class formation, the stream Class Queue, 3 interactive class formations that priority is different, the background class formation is used for the queuing of the packet of different Qos classify traffic;
Weights are given in each formation, and the accessed number of times of the formation that weights are high is some more; Press 6 formations of the continuous poll of weights, take out corresponding descriptor, descriptor is delivered to the bag Shaping Module of this cp;
The weights of 6 formations are descending to be arranged in order and to be conversation class formation-stream Class Queue-background class formation-interactive class formation 1-interactive class formation 2-interactive class formation 3;
B) bag Shaping Module
As keyword, look into the teid table with the tunnel endpoint identifier teid in the descriptor, obtain the relevant Qos information of this bag according to checking result; Also should comprise 2 content: a, this professional time that sends bag of last time in each list item; Remained b, last time the length of token behind this professional transmission packet;
C) bag monitoring module
Monitor the length of the formation on each cp,, make no congested, the slightly congested still judgement of heavy congestion of congested, moderate, handle congested by following method according to the difference of Congestion Level SPCC according to the degree that the descriptor of buffer memory in the formation reaches:
Occur slightly when congested when ATM receives formation, the transmitted bit bit of conversation class and stream class service data flow leads and is reduced to maximum transmitted bit and leads and guarantee bit certain value between leading; The transmission bit of interactive class and background class traffic data flow leads and falls to such an extent that lead lowly than current transfer of data bit, perhaps reduces to 0;
When ATM receives formation moderate appears when congested, the transmission bit of conversation class and stream class service data flow leads and is reduced to maximum transmitted bit and leads and guarantee bit certain value between leading, this value than slight when congested in the value that is reduced to of conversation class and stream class service data flow lower; The transmission bit of interactive class and background class traffic data flow leads and also is reduced to certain value, and this value is also low than the slight value that interactive class and background class traffic data flow are reduced to when congested, perhaps reduces to 0;
When heavy congestion appears in ATM reception formation, the transmission bit of conversation class and stream class service data flow leads the assurance transmission bit that reduces to them and leads, and it is lower that the transmission bit of interactive class and background class traffic data flow leads the value that interactive class and background class traffic data flow are reduced to when falling more congestedly than moderate; Notify the access control module to stop entering of new business simultaneously; Still heavy congestion occurs if crossed a period of time ATM reception formation, notice Qos module is carried out the packet loss processing, takes the packet loss strategy of certain probability.
2. method of in the SGSN network processing unit, improving service quality as claimed in claim 1, it is characterized in that: the weights of conversation class formation are 0.50, the weights of stream Class Queue are 0.30, the weights of background class formation are 0.10, the weights of interactive class formation 1 are 0.05, the weights of interactive class formation 2 are 0.03, and the weights of interactive class formation 3 are 0.02.
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