CN100389631C

CN100389631C - System and method for assuring quality of service in CDMA 2000 packet operation

Info

Publication number: CN100389631C
Application number: CNB2004100671939A
Authority: CN
Inventors: 刘文宇
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2004-10-15
Filing date: 2004-10-15
Publication date: 2008-05-21
Anticipated expiration: 2024-10-15
Also published as: CN1761352A

Abstract

The present invention relates to a service quality assurance technique in communication fields, which discloses a system and method thereof for assuring the service quality of code division multiple access 2000 packet services. Therefore, a CDMA2000 access network can be matched with a backbone network, and the present invention can provide a reliable QoS assurance at the CN side of a CDMA2000 packet region. A PDF in the CDMA2000 can apply for the required backbone network resource of the service in the process of establishing calling to the QoS service. The BCF can judge whether the backbone network is provided with sufficient resources; when the backbone network is provided with sufficient resources, the present invention can distribute the required resources to the QoS service; otherwise, the present invention can refused the calling. In addition, a PDSN can also be a PE of the backbone network simultaneously, and the PDG can transmit resource state information and bearing control information between the BCF and the PDSN. The PDSN can transmit the services with or without the QoS requirements in different bearing paths or network devices.

Description

System that assures quality of service in CDMA 2000 packet operation and method thereof

Technical field

The present invention relates to the service quality assurance technology in the communications field, particularly the service quality of Packet Service guarantees technology in the moving communicating field.

Background technology

Along with Internet development, with internetworking agreement (Internet Protocol, abbreviation " IP ") technology is that voice-bearer and video traffic are more and more incited somebody to action in basic the Internet, because these business are to the time delay and the jitter-sensitive of transmission, IP network must change the service mode of doing one's best in the past, provides differentiated services at different business.This just needs IP network that service quality (Quality ofService can be provided, be called for short " QoS ") guarantee, make operator or user to provide Priority Service, thereby guarantee lower delay the data that the video-voice frequency flow of transmission over networks etc. is had relatively high expectations to real-time.Wherein, QoS refer generally between the user and on the network between the user of mutual communication about the agreement of information transmission quality, for example, transmission delay allows time, the minimum transfer picture distortion factor and lip synchronization etc.

The Internet engineering duty group (Internet Engineering Task Force, be called for short " IETF ") advising some service models and mechanism aspect the QoS of IP network, mainly comprise integrated service (Integrated Service at present, be called for short " InterServ ") and two kinds of models of Differentiated Services (Differentiated Service is called for short " DiffSerr ").

Wherein, the DiffServ model relatively is fit to large-scale core network, and the schematic diagram of this model as shown in Figure 1.The DiffServ model adopts classification and polymerization thought, edge router by the Web portal place is checked business contract, according to service request to business classify, flow control, rewrite differentiated Services code point (the DiffServ Code Point of IP bag simultaneously according to business contract, be called for short " DSCP ") field, core router then provides corresponding QoS to guarantee and service according to the field of representing professional classification.Wherein, the service that provides in the DiffServ territory comprises resource allocation, grouping drop policy etc., being referred to as whenever slips a line is (Per Hop Bahaviors is called for short " PHB "), and all nodes in the DiffServ territory all will be observed PHB according to the dscp field of grouping.

Be familiar with those having ordinary skill in the art will appreciate that, the DiffServ model is based on the QoS of class, be with good expansibility, but because there is not the refusing user's flow to enter the mechanism of network, belong to a kind of network of doing one's best, under the situation that Internet resources exhaust, can't guarantee professional absolute quality of service, even the business of limit priority.For example, if backbone network resource exhaustion, Access Network can't be learnt, calls out so Access Network can continue to insert, and backbone network can not refused to call out yet, and at this moment, the not only new service that inserts can't guarantee that existing QoS business also can go wrong; For another example, when non-QoS class traffic carrying capacity is very big, can produces impact to the performance of packet data serving node (Packet Data Service Node, be called for short " PDSN "), thereby influence QoS class business.

Under above-mentioned background, IP Telecommunication Network is suggested to overcome some defectives of above-mentioned DiffServ.IP Telecommunication Network is to be based upon on the IP network technical foundation, supports the IP new business of carrier grade service quality simultaneously.Its basic ideas comprise following some:

1. on the basic physics IP network, static configuration multi protocol label exchange (MultiProtocol LabelSwitching, be called for short " MPLS ") label switched path (Label Switched Path, be called for short " LSP ") as interoffice junction, introduce the N square of problem that can run into when the tandem router solves big net of static LSP group, form a carrying logic net at last based on the LSP topology;

2. at the edge of IP bearer network, introduce edge router, the access of telecommunications real time business all must be through edge router, carry out qos policy by edge router, implement functions such as traffic policing, when flow surpasses the bandwidth of user applies, carry out the flow drop policy;

3. introducing explorer between Business treatment and bearer network is the bearer control layer of main body, the resource that adopts classification thought to manage carrying logic nets at different levels respectively;

4. call entry reject mechanism, Business Stream is before entering the IP bearer network, send to carry to explorer by the equipment of controlling service access earlier and comprise bandwidth and the isoparametric message application of five-tuple bearing resource, explorer is the Business Stream routing according to the topological sum resource situation of carrying logic net, if the bearer network resource is not enough, access with regard to refusing user's, the access user that prevents to continue under the situation that the bearer network resource exhausts soon brings other accessed user's QoS to ensure, if the bearer network resource is enough, by consulting between explorer, select the label stack of LSP end to end of an optimization for the user, the situation that takies of change LSP bandwidth, and the notice edge router is carried out relevant routing policy;

5. carry out traffic classification at edge router, distinguish traditional business of networking of doing one's best and telecommunication service in real time, implement Differentiated Services by the DiffServ technology.

From above as can be seen, IP Telecommunication Network has following characteristics: user's IP wraps in to enter and has determined that it passes through route before the bearer network fully in bearer network, and router only need be transmitted at a high speed by label; IP Telecommunication Network adopts the call denial thinking, and strengthens traffic policing by edge router, guarantees professional absolute QoS with this; IP Telecommunication Network is inherited the thinking of DiffServ, carries out the mapping of traffic classification and DSCP and label on border router; IP Telecommunication Network has been inherited MPLS traffic engineering (TrafficEngineering, be called for short " TE ") balance network load, topological data by static configuration network on RM obtains tunnel endpoint identifier (Tunnel Endpoint Identifier, be called for short " TEID "), the equipment of control route and the equipment of responsible data forwarding are separated; IP Telecommunication Network utilizes many label stacks technology of MPLS, has guaranteed the terseness of LSP configuration, and only at the label stack of border router input LSP, the foundation of whole LSP is finished automatically by the agreement of MPLS.

The development of IP network further also requires mobile communication to support IP, and 3G (Third Generation) Moblie (TheThird Generation is called for short " 3G ") has just clearly proposed support Packet Service and IP.At third generation partner program 2 (3rd Generation Partnership Project 2, abbreviation " 3GPP2 ") CDMA 2000 (the Code Division Multiple Access 2000 that formulates, abbreviation " CDMA2000 ") in the packet domain network model in the relevant criterion, Packet Service QoS end to end comprises wireless side QoS and core net (Core Network is called for short " CN ") side QoS two large divisions's content.Wherein, wireless side QoS is guaranteed by the peculiar wireless technology of CDMA2000 standard; The packet domain of CN side promptly reaches between base station controller (Base Station Controller is called for short " BSC ")/Packet Control Function (PacketControl Function is called for short " PCF ") and PDSN and all adopts the IP carrying between PDSN and external network.QoS under the 3GPP2 framework between CDMA 2000 network and the IP backbone guarantees the main DiffServ of employing technology, when the user asks the QoS business, stamps the label of differencing service by PDSN, issues backbone network, thereby realizes that QoS guarantees.

According to mentioned above, in the inevitable packet domain network model that is embodied in CDMA2000 of also attending the meeting of some defectives of DiffServ technology, a kind of fairly perfect scheme that can provide QoS to guarantee in the CN of CDMA2000 packet domain side just is provided for this.

In actual applications, a kind of relatively perfect scheme that provides reliable QoS to guarantee in the CN of CDMA2000 packet domain side also is not provided at present, assurance CDMA Access Network that neither one is fairly perfect and the scheme of the QoS between the backbone network, because the CDMA2000 Access Network is not also known resource operating position in the backbone network, in the time of the backbone network resource exhaustion, still can send data to backbone network, thereby and backbone network can not carry out call denial yet causes the absolute QoS of all business all can't be guaranteed; Even adopt IP Telecommunication Network to solve with call denial and resource management function, because IP Telecommunication Network has also just defined a kind of Business Stream and carried the blanket method that guarantees absolute QoS on IP network, but how to cooperate specific to the CDMA2000 access network equipment, how to guarantee the not definition of QoS of CDMA2000 Access Network business with backbone device.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of system that assures quality of service in CDMA 2000 packet operation and method thereof, make the CDMA2000 Access Network to match, can provide reliable QoS to guarantee in the CN of CDMA2000 packet domain side with backbone network with QoS assurance.

For achieving the above object, the invention provides a kind of system that assures quality of service in CDMA 2000 packet operation, comprise: CDMA 2000 Access Network side is used to carry the strategy decision function device of control and be used for the packet data serving node equipment that mobile subscriber's grouped data inserts, and the backbone network controlled function equipment of backbone network side, being used for according to quality of service requirement is the professional routing and the resource of managing bearing bed at bearing bed, and described strategy decision function device and described backbone network controlled function equipment increase an interface;

Described strategy decision function device also is used for receiving when requiring to establish the service call of quality of service requirement, and the interface by described increase sends solicitation message, the resource of applying for the described backbone network that this business is required to described backbone network controlled function equipment;

Described backbone network controlled function equipment also is used for responding described solicitation message by the interface of described increase, for the described traffic assignments backbone network resource that quality of service requirement is arranged, refuses the calling of this business when inadequate resource.

Wherein, the described packet data serving node equipment edge router that also can be used as described backbone network provides bearer control function.

Described backbone network controlled function equipment also is used for transmitting bear control information to described strategy decision function device, and sends described packet data serving node equipment as required to by described strategy decision function device.

Described packet data serving node equipment also can be used for transmitting resource state information to described strategy decision function device, and sends described backbone network controlled function equipment to by described strategy decision function device.

Described packet data serving node equipment also is used for whether quality of service requirement being arranged by different bearer paths or network equipment transport service according to business.

The present invention also provides a kind of method that assures quality of service in CDMA 2000 packet operation, and comprises following steps:

Strategy decision function device in the A CDMA 2000 system is in the call establishment of the business that quality of service requirement is arranged, by and backbone network controlled function equipment between an interface increasing, should the needed backbone network resource of business to the application of described backbone network controlled function equipment;

The described backbone network controlled function of B equipment responds described application by the interface of described increase, judges whether backbone network has enough resources, if then be that described application distributes resource requirement, otherwise refuses described calling.

Wherein, also comprise following steps:

The described strategy decision of C function device is to the resource state information of described backbone network controlled function device report from packet data serving node equipment;

The described strategy decision of D function device sends the bear control information that receives from described backbone network controlled function equipment to described packet data serving node equipment;

The described packet data serving node equipment of E is carried out carrying control according to the bear control information that receives as the edge router of described backbone network.

Also comprise following steps:

Whether the packet data serving node equipment that is connected with described strategy decision function device has quality of service requirement by different bearer paths or network equipment transport service according to business.

By relatively finding, technical scheme difference with the prior art of the present invention is, for the QoS business, PDF among the CDMA2000 applies for the needed backbone network resource of this business to BCF in call establishment, BCF judges whether backbone network has enough resources, if then be QoS traffic assignments resource requirement, otherwise refuse described calling.In addition, PDSN also can make the PE of backbone network simultaneously, and PDF transmits resource state information and bear control information between BCF and PDSN.PDSN transmits with the different bearer paths or the network equipment the business that has or not qos requirement.

Difference on this technical scheme, brought comparatively significantly beneficial effect, promptly because the present invention program's backbone network has the function of guaranteed qos, can carry out QoS control to the application of QoS business by interface between CDMA2000 access network equipment PDF and the backbone device BCF simultaneously, thereby guaranteed the absolute QoS of service, satisfied the requirement of carrier-class Packet Service; Simultaneously, because the present invention program can transmit information such as carrying control and resource status between PDF and BCF, therefore also can realize the seamless link between CDMA2000 access network equipment PDSN and the backbone network, bring into play the function of PDSN to a greater extent, especially when backbone network and Access Network were same operator, the present invention program had very big advantage.

Description of drawings

Fig. 1 is that the system of DiffServ model forms schematic diagram;

Fig. 2 is the system's composition schematic diagram according to the assurance CDMA2000 Packet Service QoS of a preferred embodiment of the present invention;

Fig. 3 sets up under the situation of QoS business the schematic flow sheet of interacting message between each equipment according to the success of the method for the assurance CDMA2000 Packet Service QoS of a preferred embodiment of the present invention;

Fig. 4 is according to the schematic flow sheet of interacting message between each equipment under the situation of the QoS business that PDSN is set up as the success of the method for the assurance CDMA2000 Packet Service QoS of backbone network edge router of a preferred embodiment of the present invention.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.

Basic principle of the present invention at first is described.The present invention is by the cooperation between the IP Telecommunication Network equipment of CDMA2000 access network equipment and backbone network, between backbone network and CDMA2000 Access Network, transmit the QoS business that backbone network is set up in the parameter application by newly-increased interface, transmit bear control information, resource state information, and by edge router or PDSN distinguish transmit the QoS class professional with non-QoS class business, the different business of QoS is walked different paths in the backbone network simultaneously, thereby the QoS business in the design capacity that definitely guarantees can be transmitted smoothly.Carry out in advance QoS application owing to can transmit information such as qos parameter between the present invention program's CDMA access network equipment and the backbone network, in the backbone network inadequate resource, can guarantee professional absolute QoS, thereby make the QoS of CDMA2000 packet domain guarantee more reliable by means such as refusal callings.

System according to the assurance CDMA2000 Packet Service QoS of a preferred embodiment of the present invention forms schematic diagram as shown in Figure 2.

The system that guarantees CDMA2000 Packet Service QoS is made up of following equipment: application function (Application Function, be called for short " AF ") equipment 10, be in strategy decision function (the Policy Decision Function of CDMA2000 Access Network, be called for short " PDF ") equipment 20 and packet data serving node (Packet Data Service Node, be called for short " PDSN ") equipment 30, be in backbone network controlled function (Backbone Control Function is called for short " the BCF ") equipment 40 in the backbone network.Wherein, backbone network is previously described IP Telecommunication Network, and BCF equipment 40 is IP Telecommunication Network equipment.

AF equipment 10, PDF equipment 20 and PDSN equipment 30 are connected successively, and PDF equipment 20 is connected with BCF equipment 40 and transmits the relevant information of PDF equipment 20 to backbone network application QoS business.

Wherein, the original function of each equipment is as well known to those skilled in the art, in this simple declaration once.PDF is used as the carrying control of QoS guarantee, Access Network side in CDMA2000.PDSN is the IAD that connects wireless network and Packet Data Network, for mobile Internet/Intranet user provides the grouped data access service.BCF is used for the resource of carrying out professional routing and managing bearing bed at bearing bed according to the QoS requirement.

Improvement of the present invention is, increases a new interface between PDF equipment 20 and BCF equipment 40, by this interface between the BCF of PDF equipment 20 and backbone network equipment 40, transmits send comprise apply for the QoS business information in interior information.Corresponding with it, PDF equipment 20 and BCF equipment 40 have also increased function corresponding.

PDF equipment 20 also is used for when the QoS that sets up the CDMA2000 network is professional, to BCF equipment 40 to backbone network application QoS business.Wherein, some relevant informations of the QoS business that PDF equipment 20 sends to BCF equipment 40, parameters such as the five-tuple of this QoS business and bandwidth for example are to backbone network application QoS business.

BCF equipment 40 also is used for the information that sends according to PDF equipment 20 Resources allocation and guaranteed qos business from the backbone network reserved resource and walks special-purpose route, refuses the application of this QoS business can't Resources allocation the time.About the detailed description of IP Telecommunication Network and BCF, can be 03104068.3 Chinese invention patent referring to application number.

For example, in a preferred embodiment of the present invention, when user applies is set up the QoS business, PDF equipment 20 is initiated the QoS business authentications to AF equipment 10, receive the affirmation of AF equipment 10 after, PDF equipment 20 not only is responsible for setting up the QoS business of CDMA2000 network, also need by the interface between the BCF equipment 40 in PDF equipment 20 and the backbone network, to backbone network application QoS business, when two ends all set up finish after, just provide service to the user.Information Resources allocation from reserved resource that BCF equipment 40 in the backbone network transmits according to PDF equipment 20, and assurance user's QoS business is walked special network.Adopt such processing method, just can access the professional assurance of absolute QoS.

Be familiar with those having ordinary skill in the art will appreciate that, based on above-mentioned system architecture, can use the professional and non-QoS class business of PDSN equipment 30 distinguishing QoS classes, thereby make different QoS walk the different bearer paths or the different network equipments, thereby improve the service guarantees ability of QoS.

Equally based on the said system framework, in a preferred embodiment of the present invention, on the Go interface between PDF equipment 20 and the PDSN equipment 30, transmit the bear control information of BCF equipment 40, PDSN equipment 30 is used as the edge router of backbone network, also sends resource state informations to the BCF of backbone network equipment 40 simultaneously by PDF equipment 20.So just the resource of PDSN equipment 30 is brought in the range of management of backbone network, thus the seamless link of realization CDMA2000 Access Network and backbone network.During specific implementation, BCF equipment 40 is not that bear control information is sent to the edge router that joins with PDSN equipment 30, but is dealt into PDF equipment 20 by the interface of redetermination of the present invention, and sends to PDSN equipment 30 by PDF equipment 20 by Go interface; Also have a responsibility for to the current resource status of PDF equipment 20 reports as the PDSN equipment 30 of backbone network edge router, and give BCF equipment 40 these status information reportings by PDF equipment 20.Be familiar with persons of ordinary skill in the art may appreciate that this scheme when backbone network and CDMA2000 Access Network belong to same operator, can simplify networking, be convenient to unified management.

Set up under the situation of QoS business between each equipment the flow process of interacting message according to the success of the method for the assurance CDMA2000 Packet Service QoS of a preferred embodiment of the present invention as shown in Figure 3.

At first enter step 110, carry out basic call between base station controller/Packet Control Function equipment 50 and the AF equipment 10 and set up flow process.Wherein, this flow process and existing flow process are identical, since little with key point relation of the present invention, do not describe in detail at this.

Then enter step 120, PDSN equipment 30 is set up the QoS channel to 20 requests of PDF equipment.In this step, PDSN equipment 30 sends QoS to PDF equipment 20 and authorizes (QoS Authorization) message.

Then enter step 130, PDF equipment 20 is to AF equipment 10 request qos parameters.Wherein, in this step, PDF equipment 20 sends qos parameter request (QoS Parameters request) message to AF equipment, and QoS Parameters request message can comprise information such as the five-tuple of QoS business and bandwidth.

Then enter step 140, AF equipment 10 returns the Qos parameter.Wherein, in this step, PDF equipment 20 returns qos parameter authorization response (QoS Parameters Authorizationresponse) message to AF equipment 10.

Then enter step 150, PDF equipment 20 returns qos parameter, inserts side and begins to set up the QoS passage.Wherein, in this step, PDF equipment 20 is QoS authorization response (QoS Authorization response) message to the message that PDSN equipment 30 sends.

Then enter step 160, PDF equipment 20 is initiated carrying to backbone network and is set up request.Wherein, in this step, PDF equipment 30 sends the QoS carrying to BCF equipment 40 and sets up request (QoS bearersetup request) message, and this message can comprise information such as the five-tuple of QoS business and bandwidth.

Then enter step 170, the Access Network QoS passage is set up and is finished, notice PDF equipment 20.In this step, PDSN equipment 30 sends QoS foundation to PDF equipment 20 and finishes (QoS Setupcomplete) message.

Then enter step 180, backbone network QoS passage is set up and is finished, notice PDF equipment 20.In this step, BCF equipment 40 sends QoS foundation to PDF equipment 20 and finishes (QoS setupcomplete) message.

Then enter step 190, the professional foundation of PDF equipment 20 notice AF equipment 10QoS finishes.In this step, PDF equipment 20 sends QoS foundation to AF equipment 10 and finishes (QoS setup complete) message.

Being familiar with persons of ordinary skill in the art may appreciate that in this preferable enforcement, if remove step 160 and step 180, is exactly the flow process that the QoS business is set up in the success of the method for CDMA2000 Packet Service QoS in the prior art.In this preferred embodiment, it is essential when the professional required resource of backbone network application QoS that step 160 and step 180 are CDMA2000 Access Networks, can learn the resource operating position of backbone network by these two steps, avoid in the backbone network resource exhaustion also sending the situation that data cause the absolute QoS of all business all can't guarantee and occur to backbone network.

In addition, need to prove, is the response of failure if any one request message obtains in the above-mentioned steps, and this QoS business all will be rejected to guarantee absolute QoS.For example, in a preferred embodiment of the present invention, the backbone network resource exhausts, and step 180 was just returned the QoS passage and set up failure this moment, and PDF equipment 20 is received the relevant treatment of just refusing this QoS business after this message.

In another preferred embodiment of the present invention, also transmit bear control information, resource state information in PDF equipment 20 and the backbone network between the BCF equipment 40, PDSN equipment 30 with router feature is brought into backbone network carrying control range, and the message interaction process between the corresponding apparatus as shown in Figure 4.

The order that step is carried out in this preferred embodiment is step 110-＞step 120-＞step 130-＞step 140-＞step 160-＞step 180-＞step 150-＞step 170-＞step 190.

With respect to preferred embodiment shown in Figure 3, in the preferred embodiment shown in Figure 4 with the edge router of PDSN equipment 30 as backbone network, except the evolution of step 160 and step 180, the also corresponding transmission that increases some message.

In this preferred embodiment, PDSN equipment 30 also reports the resource state information of PDSN equipment 30 in giving the message of PDF equipment 20, and reports BCF equipment 40 by PDF equipment 20; BCF equipment 40 also transmits carrying control messages and resource status message in giving the message of PDF equipment 20, and passes to PDSN equipment 30 by PDF equipment 20.

Those of ordinary skill in the art are appreciated that, if CDMA packet network and backbone network belong to an operator, adopt the scheme of this preferred embodiment can guarantee PDSN and backbone network seamless link, BCF with PDSN as the backbone network edge router, can send the QoS instruction to PDSN, the function of maximum performance PDSN, tool has great advantage.

Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.

Claims

1. system that assures quality of service in CDMA 2000 packet operation, comprise: CDMA 2000 Access Network side is used to carry the strategy decision function device of control and be used for the packet data serving node equipment that mobile subscriber's grouped data inserts, and the backbone network controlled function equipment of backbone network side, being used for according to quality of service requirement is the professional routing and the resource of managing bearing bed at bearing bed, it is characterized in that described strategy decision function device and described backbone network controlled function equipment increase an interface;

2. the system that assures quality of service in CDMA 2000 packet operation according to claim 1 is characterized in that, the edge router that described packet data serving node equipment also can be used as described backbone network provides bearer control function.

3. the system that assures quality of service in CDMA 2000 packet operation according to claim 2, it is characterized in that, described backbone network controlled function equipment also is used for transmitting bear control information to described strategy decision function device, and sends described packet data serving node equipment as required to by described strategy decision function device.

4. the system that assures quality of service in CDMA 2000 packet operation according to claim 3, it is characterized in that, described packet data serving node equipment also can be used for transmitting resource state information to described strategy decision function device, and sends described backbone network controlled function equipment to by described strategy decision function device.

5. the system that assures quality of service in CDMA 2000 packet operation according to claim 1, it is characterized in that described packet data serving node equipment also is used for whether quality of service requirement being arranged by different bearer paths or network equipment transport service according to business.

6. a method that assures quality of service in CDMA 2000 packet operation is characterized in that, comprises following steps:

7. the method that assures quality of service in CDMA 2000 packet operation according to claim 6 is characterized in that, also comprises following steps:

8. the method that assures quality of service in CDMA 2000 packet operation according to claim 6 is characterized in that, also comprises following steps: