CN101136864A - Service information based resource demand admittance controlled method - Google Patents
Service information based resource demand admittance controlled method Download PDFInfo
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Abstract
The invention discloses method of resource request admission control based on service info. In resource admission control (RAC) system of next generation network, RAC function obtains users' dialog info including service ID from service control functions based on resource request. Based on the said dialog information, the method obtains user's info of signing contract from auxiliary function of network based on corresponding service ID. Based on info of signing contract, and condition of using current resources, the method makes admission decision, and down sands the generated strategy to the strategy execution function in transmission layer to carry out resource control for dialog stream. Comparing with prior art, the disclosed admission control method based on service information satisfies need of refinement operation from operation manager, enhances current admission control mode, and implements authorization and putting apart resource in advance based on service.
Description
Technical field
The present invention relates to communication technical field, relate in particular to the method for admitting control in a kind of NGN (next generation network, NextGeneration Network) network based on the resource request of business information.
Background technology
Next generation network (NGN) is because bearer network has adopted group technology, and particularly the IP technology makes that its problem at QoS (Quality of Service, service quality) aspect is especially outstanding.
ITU-T (International Telecommunications Union) and ETSI (ETSI) have set up the particular study group separately, are devoted to the formulation work of NGN technical standard.ITU-T has proposed RACF (Resource and Admission Control Function, resource accommodating control function), ETSI has proposed the QoS problem that RACS (Resource and Admission Control Subsystem, Resource and Admission Control Sub-system) solves the NGN bearer network.
Though the draft scope difference of the resource acceptance control system of two big tissues, and some concrete functional entity definition are slightly variant, and its framework is a phase Sihe compatibility.Promptly, admit control according to signatory QoS information of user and network internal available resources based on the operation policing rule.
In the up-to-date draft of the RACF that the ITU-T of International Telecommunications Union announced in April, 2007, the functional framework of RACF is provided, as shown in Figure 1:
PD-FE is policy deciding functional entity (Policy Decision Function Entity), and it can make preliminary QoS resource decision based on medium streaming session information, user's transfer resource CAMEL-Subscription-Information; With affirmation whether enough QoS resources are arranged alternately with TRC-FE (Transport Resource Control Function Entity, transfer resource controlled function entity) then; Make a final decision at last, and this decision-making is handed down to PE-FE (Policy Execute Function Entity, policy execution functional entity) execution.Medium streaming session information wherein can be by the Rs interface from SCF (Service ControlFunction, business control function body) obtains, user's transfer resource CAMEL-Subscription-Information can obtain from NACF (Network Attachment Control Function, network attached controlled function entity) by the Ru interface.
TRC-FE mainly is responsible for resource control, and the resource in its monitor network is also collected relevant information, replys according to concrete resource situation when the PD-FE request resource.
PE-FE carries out policy control (gate, bandwidth, traffic classification and mark, traffic shaping, two layers and three layers of QoS mapping, collection and report resource use information etc.) under PD-FE instructs.
TRE-FE (Transport Resource Execute Function Entity, transfer resource carry out functional entity) the present explanation of agreement is to carry out two layers strategy execution under TRC-FE instructs, and is definite but concrete function and scope all not have.
In the up-to-date draft of the RACS that the ETSI TISPAN of ETSI announced in June, 2007, the functional framework of RACS is provided, as shown in Figure 2:
SPDF (Service-based Policy Decision Function, strategy decisive function based on business) according to AF (Application Function, application function) local policy is selected in request, and request is mapped to the IP qos parameter, send to x-RACF (generic Resource and AdmissionControl Function, the accommodating access resource controlled function) and BGF (Border Gateway Function, Border Gateway Function), to ask corresponding resource.
X-RACF receives from SPDF and asks, and realizes admitting control based on the strategy of being preserved then, accepts or refuses transmitting the request of resource.X-RACF can be by the e4 reference point from Network Attachment Subsystem (Network Attachment Sub-System, NASS) obtain network attachment information and user QoS CAMEL-Subscription-Information, thereby can determine available network resources according to network location information (for example inserting the address of user's physical node), simultaneously when the processing resource allocation request with reference to user's QoS CAMEL-Subscription-Information.
BGF is (realization Core Border Gateway Function) between Access Network and core net, also can be at the gateway between two core net.BGF finishes NAT (network address translation), gate, QoS mark, bandwidth constraints, use measurement and source synchronous function under the control of SPDF.
RCEF (Resource Control Enforcement Function, Resource Control Enforcement Function) implements two layers/three layers (L2/L3) Media Stream strategy of the access carrier definition that x-RACF sends by the Re reference point, finish functions such as gate, QoS mark, bandwidth constraints.
L2TF (Layer 2 Termination Function, two layers of termination function) is the functional entity of two layers of connection of termination in the Access Network.RCEF is two different logical functional entities with L2TF, can realize on same physical equipment usually.
In above-mentioned RACF system and RACS system, request for resource reservation, the transmission CAMEL-Subscription-Information (i.e. Qian Yue QoS rank, bandwidth) that is the user that provides of the medium stream information that provides according to SCF/AF and NACF/NASS is at present admitted decision-making, the concrete flow process of implementing may further comprise the steps as shown in Figure 3:
Step 301, resource accommodating control function RACF/RACS receive resource request, trigger the process of decision-making;
If step 302 RACF/RACS does not have relevant session information, RACF/RACS can obtain the session information relevant with resource request alternately with service control function SCF/AF so;
Step 303, RACF/RACS and network attached function NACF/NASS obtain user's CAMEL-Subscription-Information alternately;
Step 304, RACF/RACS make the admittance decision-making according to session information and CAMEL-Subscription-Information to resource request;
Step 305, RACF/RACS are handed down to policy enforcement function with final decision to be carried out.
At present, if the information spinner that between SCF/AF and RACF/RACS, transmits:
The QoS resource information, mainly be the type of describing Media Stream, feature (five-tuple etc.) and and QoS rank and bandwidth;
If the information spinner that between NACF/NASS and RACF/RACS, transmits:
The transfer resource CAMEL-Subscription-Information comprises service class, upstream bandwidth, downlink bandwidth etc.
By above-mentioned in the description of present RACF/RACS and related mutual information as can be seen, present RACF/RACS, though admittance and resource reservation can be asked based on Media Stream, but SCF/AF only provides the description and the type of Media Stream, do not provide that can to distinguish specifically be the information of what business, and the CAMEL-Subscription-Information that NACF/NASS can offer RACF/RACS is also just at the QoS information of user class, though therefore can authorize and resource reservation at other request of Media Stream level that SCF/AF sends, but in fact, just provide based on the resource and admission of user class and control according to the total QoS CAMEL-Subscription-Information of user, can not be meticulous carry out authorization control according to user's which business of having contracted, and carry out resource reservation control according to these professional QoS CAMEL-Subscription-Information.
Along with operator constantly release horn of plenty more, differentiated business, mandate that these business often need to provide independent and different QoS ensure, only will be not easy to manage control from the signatory QoS of user class.And for the user, also be difficult to hold the business of oneself expecting visit needs the QoS rank of great bandwidth and Duo Gao could guarantee normal the use actually, if signatory bandwidth is not enough, may often not visit the business of own expectation so, if signatory too high, mean that the user will bear unnecessary waste.
Further, for different business, even its QoS demand is identical, because the difference of business tine, operator may also can be different to the principle of its charging.
Therefore, control the demand that can not satisfy such lean operation, just need admit control model to strengthen, enable to reach based on business and authorize and resource reservation existing resources based on the admittance of user class.
Summary of the invention
Technical problem to be solved by this invention is, a kind of method of admitting control based on the resource request of business information is provided, in generation NGN network, realize resource request admittance control down based on business information, the admittance control of compatible user class, the problem that can not satisfy based on the lean operation demand of business is controlled in the admittance that solves user class.
For solving the problems of the technologies described above, the invention provides a kind of resource request and admit the method for controlling based on business information, in the resource acceptance control system of next generation network, realize admitting control based on the resource request of business information, wherein:
Resource accommodating control function obtains user's the session information that comprises task identifier from service control function according to resource request, obtain the CAMEL-Subscription-Information of this user according to described session information from network attached function based on corresponding task identifier, make the admittance decision-making according to the operating position of CAMEL-Subscription-Information and present resource, and session stream is carried out resource for the transport layer policy enforcement function policy distribution that generates and control.Described network attached function stores user's signing service and service quality QoS information thereof.
Described method is further divided into following steps:
(21) resource accommodating control function is received resource request, triggers the process of decision-making;
(22) resource accommodating control function by obtaining session information alternately with service control function, will comprise task identifier according to resource request in the session information that gets access to;
(23) resource accommodating control function if got access to task identifier before, will comprise task identifier in the request to network attached function request user's CAMEL-Subscription-Information so;
(24) if the user signing contract information in the network attached function is based on business, and comprise task identifier in the request of receiving, then that this user is relevant with this business CAMEL-Subscription-Information sends to resource accommodating control function in response message;
(25) resource accommodating control function is made according to the operating position of user signing contract information that gets access to and present resource and is admitted decision-making, and generation strategy;
(26) resource accommodating control function is given the transport layer policy enforcement function with the policy distribution that generates, and policy enforcement function is responded to resource accommodating control function and answered, and according to described strategy session stream is carried out resource control.
Described step further comprises in (24): if CAMEL-Subscription-Information is not based on business, perhaps resource accommodating control function does not comprise task identifier in the request that network attached function sends, and then will return the CAMEL-Subscription-Information of user class to resource accommodating control function.
In the described step (22):
Service control function provides task identifier information by mutual with resource accommodating control function to resource accommodating control function, and user's sign, stream description, requested service quality Q oS information also is provided simultaneously.
In the described step (24):
Network attached function is the task identifier that obtains according to from resource accommodating control function, finds the relevant CAMEL-Subscription-Information of this user based on business from user signing contract information, and send to resource accommodating control function in response message.
In the described step (25):
When resource accommodating control function is made the admittance decision-making according to the operating position of user signing contract information that gets access to and present resource, if requested service quality Q oS is equal to or less than the QoS in user's signing service information, and current available resource can satisfy request, so just admits this request.
In said method, described resource acceptance control system is the system that the ITU-T of International Telecommunications Union formulates, wherein, described resource accommodating control function is resource accommodating control function RACF, described service control function is business control function body SCF, and described network attached function is network attached controlled function entity.
In said method, described resource acceptance control system is the system that the ETSI of ETSI formulates, wherein, described resource accommodating control function is Resource and Admission Control Sub-system RACS, described service control function is application function AF, and described network attached function is Network Attachment Subsystem NASS.
Compared with prior art, method of admitting control based on the resource request of business information provided by the invention, for operator, can adapt to operator differentiated business is provided, provide independent mandate and different QoS to ensure for these differentiated services, overcome the shortcoming that the signatory QoS of user class is not easy to manage control.For the user, can better hold the resource needs of oneself expecting the business of visit based on business information.For different business, even its QoS demand is identical, because the difference of business tine, operator can take the principle of chargeing flexibly.In sum, the acceptance controlling method based on business information of the present invention has satisfied the demand of operator's lean operation, has strengthened existing resources and has admitted control model, has realized authorizing and resource reservation based on business.
Description of drawings
Fig. 1 is the Organization Chart of the Resource and Admission Control Sub-system RACF of the ITU-T of International Telecommunications Union;
Fig. 2 is the Organization Chart of the Resource and Admission Control Sub-system RACS of the ETSI of ETSI;
Fig. 3 is the admittance decision process schematic diagram of prior art;
Fig. 4 is the admittance decision process schematic diagram based on business information.
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The present invention is directed to the problem that only can carry out business admission in the existing next generation network based on user class, a kind of method of admitting control based on the resource request of business information has been proposed, in the resource acceptance control system of next generation network, realize admitting control based on the resource request of business information, resource accommodating control function obtains user's the session information that comprises task identifier from service control function according to resource request, obtain the CAMEL-Subscription-Information of this user according to described session information from network attached function based on corresponding task identifier, make the admittance decision-making according to the operating position of CAMEL-Subscription-Information and present resource, and session stream is carried out resource for the transport layer policy enforcement function policy distribution that generates and control.
Wherein, technical scheme of the present invention has following characteristics:
(1) as signing service and the QoS information thereof that will support to store the user among the NACF/NASS of network attached function; And support to search according to user profile and task identifier, the main contents item and the organizational form of signing service and QoS information thereof can be as shown in the table:
Table 1: user's signing service and QoS information thereof
| Title | Describe |
| Signing service information | |
| -task identifier | For an operator, the professional unique identification that it provides |
| -QoS rank | Professional QoS rank, according to other difference of level, indexs such as time delay, shake have difference |
| -signatory up maximum bandwidth | Maximum upstream bandwidth when the user uses this business |
| -signatory up assurance bandwidth | Up minimum assurance bandwidth when the user uses this business |
| -signed descending maximum bandwidth | Maximum downstream bandwidth when the user uses this business |
| -signed descending guarantee bandwidth | Descending minimum assurance bandwidth when the user uses this business |
For a user, signing service information can have many parts in its CAMEL-Subscription-Information, and this depends on the number of services that it is signatory.
(2) as the SCF/AF of service control function with RACF/RACS mutual in, task identifier information need be provided, what business what promptly identify present user's request is;
SCF/AF with RACF/RACS mutual in, user's sign, stream description, the information such as QoS of request not only are provided, also wanting to provide task identifier information, and what business what promptly identify present user's request is, so that RACF/RACS is according to task identifier request CAMEL-Subscription-Information.
(3) provide task identifier as the RACF/RACS of resource accommodating control function and NACF/NASS in mutual, NACF/NASS searches and provides user's signing service information according to task identifier;
RACF/RACS if got access to task identifier, can carry task identifier with NACF/NASS when mutual so in request message before doing decision-making, NACF/NASS will search user's signing service information according to task identifier.If there is not task identifier, so still according to original mode request user class CAMEL-Subscription-Information.
(4) if judge that as the RACF/RACS of resource accommodating control function the QoS of request is not higher than the QoS in user's signing service information, and current available resource can satisfy request, and RACF/RACS just admits this request so.
Application example: concrete resource and admission decision process schematic diagram is as shown in Figure 4 in the technical solution of the present invention:
(401) resource accommodating control function is received resource request, triggers the process of decision-making;
(402) if RACF/RACS does not have relevant session information, need so with SCF/AF alternately to obtain session information, in the session information that gets access to, to comprise task identifier;
(403) RACF/RACS if got access to task identifier before, will comprise task identifier in the request to NACF/NASS request user's CAMEL-Subscription-Information so;
(404) if the user signing contract information among the NACF/NASS is based on business, and comprise task identifier in the request of receiving, so that this user is relevant with this business CAMEL-Subscription-Information sends to RACF/RACS in response message; If CAMEL-Subscription-Information is not based on professional, perhaps do not comprise task identifier in the request, will return the CAMEL-Subscription-Information of user class so;
(405) RACF/RACS makes according to the operating position of information that gets access to and present resource and admits decision-making, and generation strategy;
(406) RACF/RACS gives the transport layer policy enforcement function with the policy distribution that generates, and policy enforcement function is responded to RACF/RACS and answered, and according to strategy session stream is carried out resource control.
In sum, adopt the inventive method, can be implemented among the NGN and carry out resource and admission control based on business information.
Described herein is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Therefore, all any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improve and upgrade or the like, all should be included within protection scope of the present invention.
Claims (9)
1. the resource request based on business information is admitted the method for controlling, and realizes admitting control based on the resource request of business information in the resource acceptance control system of next generation network, it is characterized in that,
Resource accommodating control function obtains user's the session information that comprises task identifier from service control function according to resource request, obtain the CAMEL-Subscription-Information of this user according to described session information from network attached function based on corresponding task identifier, make the admittance decision-making according to the operating position of CAMEL-Subscription-Information and present resource, and session stream is carried out resource for the transport layer policy enforcement function policy distribution that generates and control.
2. the method for claim 1 is characterized in that, described network attached function stores user's signing service and service quality QoS information thereof.
3. method as claimed in claim 2 is characterized in that, described method is further divided into following steps:
(21) resource accommodating control function is received resource request, triggers the process of decision-making;
(22) resource accommodating control function by obtaining session information alternately with service control function, will comprise task identifier according to resource request in the session information that gets access to;
(23) resource accommodating control function if got access to task identifier before, will comprise task identifier in the request to network attached function request user's CAMEL-Subscription-Information so;
(24) if the user signing contract information in the network attached function is based on business, and comprise task identifier in the request of receiving, then that this user is relevant with this business CAMEL-Subscription-Information sends to resource accommodating control function in response message;
(25) resource accommodating control function is made according to the operating position of user signing contract information that gets access to and present resource and is admitted decision-making, and generation strategy;
(26) resource accommodating control function is given the transport layer policy enforcement function with the policy distribution that generates, and policy enforcement function is responded to resource accommodating control function and answered, and according to described strategy session stream is carried out resource control.
4. method as claimed in claim 3, it is characterized in that, described step further comprises in (24): if CAMEL-Subscription-Information is not based on business, perhaps resource accommodating control function does not comprise task identifier in the request that network attached function sends, and then will return the CAMEL-Subscription-Information of user class to resource accommodating control function.
5. method as claimed in claim 3 is characterized in that, in the described step (22):
Service control function provides task identifier information by mutual with resource accommodating control function to resource accommodating control function, and user's sign, stream description, requested service quality Q oS information also is provided simultaneously.
6. method as claimed in claim 3 is characterized in that, in the described step (24):
Network attached function is the task identifier that obtains according to from resource accommodating control function, finds the relevant CAMEL-Subscription-Information of this user based on business from user signing contract information, and send to resource accommodating control function in response message.
7. method as claimed in claim 3 is characterized in that, in the described step (25):
When resource accommodating control function is made the admittance decision-making according to the operating position of user signing contract information that gets access to and present resource, if requested service quality Q oS is equal to or less than the QoS in user's signing service information, and current available resource can satisfy request, so just admits this request.
8. as each described method in the claim 1 to 7, it is characterized in that, described resource acceptance control system is the system that the ITU-T of International Telecommunications Union formulates, wherein, described resource accommodating control function is resource accommodating control function RACF, described service control function is business control function body SCF, and described network attached function is network attached controlled function entity.
9. as each described method in the claim 1 to 7, it is characterized in that, described resource acceptance control system is the system that the ETSI of ETSI formulates, wherein, described resource accommodating control function is Resource and Admission Control Sub-system RACS, described service control function is application function AF, and described network attached function is Network Attachment Subsystem NASS.
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