WO2011137625A1

WO2011137625A1 - Method and system for resource admission control

Info

Publication number: WO2011137625A1
Application number: PCT/CN2010/077457
Authority: WO
Inventors: 尤建洁
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-05-05
Filing date: 2010-09-29
Publication date: 2011-11-10
Also published as: CN102238742B; CN102238742A

Abstract

A method for resource admission control is provided in the present invention, which includes: Service Control Functions (SCF) entity sends a resource request message to Resource and Admission Control Functions (RACF) entity; the resource request message carries a Quality of Service (QoS) resuming indication parameter for the service; if the QoS resuming indication parameter is resuming allowed, the RACF entity performs the resource usability inspection, and if the resource demand for resuming the QoS is satisfied, the original QoS is resumed. A system for resource admission control is provided in the present invention at the same time. After receiving the service request, the SCF entity is used for sending a resource request message to the RACF entity; wherein, the message carries the QoS resuming indication parameter for the service; the RACF entity is used for checking the requested resource, and feeding the resource admission result back to the SCF entity. When determining the idle resource is existed in the current network, the RACF entity will notify the SCF entity in time. Based on the circumstance of the idle resource, the SCF entity performs the corresponding QoS resuming for the services, of which the QoS has been reduced, and makes the QoS resume to the QoS level before reduced.

Description

Resource admission control method and system

The present invention relates to resource admission control techniques, and more particularly to a resource admission control method and system. Background technique

At present, NGN (Next Generation Network) is a hot research topic in the field of communication standards. It uses IP packet technology as the bearer network technology and integrates fixed communication and mobile communication, so that NGN can provide richer multimedia. Services, for example, emerging services with real-time requirements such as IP TV, video conferencing, multimedia distance learning, video on demand, etc. These services require communication networks to provide efficient end-to-end Quality of Service (QoS) support; At the same time, users' requirements for network service quality are getting higher and higher. Therefore, providing end-to-end QoS is one of the core issues of NGN.

The International Telecommunication Union-Telecommunications Standardization Sector (ITU-T) is the telecommunications division of the International Telecommunication Union (ITU), which sets standards for resource admission control. In the latest draft of the Resource and Admission Control Functions (RACF) published by ITU-T, the functional framework of the RACF entity is provided. As shown in Figure 1, the RACF entity consists of two parts, which are policy decisions. Functional entity (PD-FE, Policy Decision Functional Entity) and Transport Resource Control Functional Entity (TRC-FE), where TRC-FE interacts with the transport function entity through the Rc interface, and through the Rn interface and transmission resources. TRE-FE (Transport Resource Enforcement Functional Entity) interaction; PD-FE interacts with TRC-FE through the Rt interface, and through the Rh interface with the customer premises network (CPN, Customer Premises Network ) interacts with the Policy Enforcement Functional Entity (PE-FE) through the Rw interface, interacts with the Service Control Functions (SCF) of the service layer through the Rs interface, and connects to the network through the Ru interface and the network. The NACF (Network Attachment Control Functions) interacts; and the PD-FE also interacts with other next-generation networks through the Ri interface.

In addition, the PD-FE is independent of the transmission technology and is also independent of the SCF entity. The PD-FE is based on network policy rules, service information provided by the SCF entity, transport layer subscription information provided by the NACF entity, and resource availability decision results provided by the TRC-FE. , making the final decision on resource acceptance control.

Although TRC-FE is not related to the business, it is related to transmission technology. The TRC-FE is responsible for collecting and maintaining transport network information and resource status information. Upon receiving a resource request from the PD-FE, the TRC-FE performs resource-based admission control based on QoS, priority requirements, resource availability information, and transport-related policy rules.

The transport layer consists of a Policy Enforcement Functional Entity (PE-FE) and a Transport Resource Enforcement Functional Entity (TRE-FE). The PE-FE performs the policy rule delivered by the PD-FE, and the PE-FE is a packet-to-packet gateway, which may be located between the Customer Premises Network (CPN) and the access network, or located in the access network and the core. Between the networks or between different carrier networks, it is a key node that supports dynamic QoS control, port address translation control, and Network Address Translator (NAT) traversal. The TRE-FE implements the transmission resource policy rule delivered by the TRC-FE.

At present, when the current resources in the network are tight, the QoS policy of the services of some users is adjusted, that is, the QoS of the service is lowered, so as to ensure that the user service access does not occupy excessive resources. However, once the resources in the network are idle, the current network does not recover the down-polished QoS policy. This obviously causes serious waste of current resources, and the QoS of the service cannot be better guaranteed. Summary of the invention

In view of this, the main objective of the present invention is to provide a resource admission control method and system, which can adjust a QoS policy for a service that requests a service according to a resource condition in a current network.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A resource admission control method, the method comprising:

The service control function SCF entity sends a resource request message to the resource admission control function RACF entity, where the resource request message carries a quality of service QoS recovery indication parameter of the service; the QoS recovery indication parameter is allowed to be restored or not allowed to be restored;

If the QoS recovery indication parameter is to allow recovery, the RACF entity performs resource availability check according to the received resource request message and restores the QoS of the service when the resource requirement for QoS restoration is met.

Preferably, the method further includes:

The RACF entity checks the current resource availability, and notifies the SCF entity when there is an idle resource, and the SCF entity determines whether the QoS of the service is restored according to the idle resource, and uses the judgment result as the service. QoS recovery indicator parameters.

Preferably, the method further includes:

When the service requests the user to roam or nomad, the SCF entity sends the resource request message to the RACF entity of the home network, and the RACF entity of the home network verifies the requested resource, and if the authentication passes, the resource request message is forwarded to the visit. The RACF entity of the network performs an availability check on the requested resource by the RACF entity of the visited network, and makes a resource admission decision according to the availability check result and the verification result of the RACF entity of the home network, and the QoS recovery indication parameter is When the resource requirements of QoS recovery are allowed to be restored and met, the QoS of the service is restored;

The RACF entity of the visited network passes the RACF entity of the home network and feeds back the resource admission result to the SCF entity. Preferably, the method further includes:

When the service requests the user to roam or nomad, the SCF entity sends the resource request message to the RACF entity of the visited network, and the RACF entity of the visited network performs the availability check on the requested resource, and forwards the resource request message to the home. The RACF entity of the network, the RACF entity of the home network verifies the requested resource; the RACF entity of the visited network makes a resource admission decision according to the availability check result and the verification result of the RACF entity of the home network, and When the QoS recovery indication parameter is a resource requirement that allows recovery and meets QoS recovery, the QoS of the service is restored;

The RACF entity of the visited network feeds back the resource admission result to the SCF entity.

Preferably, the RACF entity includes a policy decision function entity PD-FE and a transmission resource control function entity TRC-FE; the RACF entity performs an availability check on the requested resource: the PD-FE verifies the requested resource; The TRC-FE performs an availability check on the requested resource, and makes a resource admission decision based on the availability check result and the verification result of the PD-FE.

A resource admission control system, including an SCF entity and an RACF entity;

The SCF entity is configured to send a resource request message to the RACF entity after receiving the service request, where the resource request message carries a QoS recovery indication parameter of the service, where the QoS recovery indication parameter is allowed to be restored or not allowed to be restored. ;

The RACF entity is configured to perform resource availability check according to the resource request message when the QoS recovery indication parameter is allowed to be restored, and restore the QoS of the service when the resource requirement of the QoS recovery is met.

Preferably, the RACF entity is further configured to: check the current resource availability, and notify the SCF entity when there is an idle resource, where the SCF entity is further configured to: whether the QoS of the service is restored according to the idle resource. The decision is made and the decision result is used as a QoS recovery indication parameter of the service. Preferably, when the service requests the user to roam or nomad, the SCF entity is to the home network.

The RACF entity sends the resource request message, the RACF entity of the home network verifies the requested resource, and forwards the resource request message to the RACF entity of the visited network, and the RACF entity of the visited network makes the requested resource available. Checking, making a resource admission decision according to the availability check result and the verification result of the RACF entity of the home network, and recovering the QoS of the service when the QoS recovery indication parameter is a resource request that allows recovery and meets QoS recovery ;

The RACF entity of the visited network passes the RACF entity of the home network and feeds back the resource admission result to the SCF entity.

Preferably, when the service requests the user to roam or nomad, the SCF entity sends the resource request message to the RACF entity of the visited network, and the RACF entity of the visited network performs an availability check on the requested resource, and the resource request message is Forwarding to the RACF entity of the home network, verifying the requested resource by the RACF entity of the home network; the RACF entity of the visited network makes a resource admission decision according to the availability check result and the verification result of the RACF entity of the home network, And recovering the QoS of the service when the QoS recovery indication parameter is a resource requirement that allows recovery and meets QoS recovery;

Preferably, the RACF entity includes a policy decision function entity PD-FE and a transmission resource control function entity TRC-FE;

The PD-FE is configured to verify the requested resource;

The TRC-FE is configured to perform an availability check on the requested resource, and make a resource admission decision according to the availability check result and the verification result of the PD-FE.

In the present invention, after receiving the service request, the SCF entity uses the QoS recovery indication parameter of the service as a cell in the resource request message when generating the resource request message, so that the RACF entity can perform resource admission control according to The corresponding QoS recovery indication parameter is requested The service performs QoS recovery to meet the QoS requirements of the service as much as possible.

When the RACF entity determines that there are idle resources in the current network, it will notify the SCF entity in time. The SCF entity will perform corresponding QoS recovery for the services whose QoS has been down-regulated according to the idle resources, so as to reach the QoS level before the down-regulation. Moreover, when it is determined that the service needs to restore the QoS, after receiving the corresponding service request, a corresponding recovery indication parameter is generated, and the RACF entity is notified to perform resource admission control. The technical scheme of the invention is simple and the implementation cost is low. DRAWINGS

1 is a schematic structural diagram of an ITU-T RACF entity;

2 is a flowchart of a resource admission control method according to an embodiment of the present invention;

3 is a flowchart of a resource admission control method according to Embodiment 2 of the present invention;

4 is a flowchart of a resource admission control method according to Embodiment 3 of the present invention;

5 is a flowchart of a service QoS recovery strategy performed by an SCF entity of the present invention;

FIG. 6 is a schematic structural diagram of a resource admission control system according to the present invention. detailed description

The basic idea of the present invention is: When the RACF entity determines that there are idle resources in the current network, it will notify the SCF entity in time, and the SCF entity will perform corresponding QoS recovery on the services whose QoS has been down-regulated according to the idle resources. Reach the QoS level before the downgrade. Moreover, when it is determined that the service needs to restore the QoS, after receiving the corresponding service request, a corresponding recovery indication parameter is generated, and the RACF entity is notified to perform resource admission control.

The present invention will be further described in detail below with reference to the accompanying drawings.

The invention will now be described in detail in conjunction with the drawings and embodiments.

2 is a flowchart of a resource admission control method according to an embodiment of the present invention. As shown in FIG. 2, the example resource admission control method includes the following steps: Step 201: The user initiates a service request, and sends a request message to the SCF entity, and triggers the SCF entity to generate a resource initialization request.

Step 202: The SCF entity determines a QoS resource parameter of the requested service, such as a bandwidth, a service type, a service level, and the like, and then sends a resource initialization request message to the PD-FE, where the message carries information such as a media stream description, a QoS parameter, and a recovery indication parameter. Requesting RACF for QoS resource authorization and reservation;

Step 203: After receiving the resource initialization request message, if the PD-FE does not store the subscription information of the user, the PD-FE interacts with the NACF entity to obtain the subscription information of the user from the NACF entity. The request message of the user's subscription information is sent to the NACF entity, and the NACF entity feeds back the subscription information of the requested user to the PD-FE. The subscription information acquisition method is not limited in this example.

Step 204: The PD-FE performs an authorization check on the resource initialization request, including whether the QoS resource of the resource initialization request is consistent with the local operator policy rule and the user subscription information. The user subscription information is from the NACF or locally stored in the PD-FE. .

Step 205: The PD-FE decides (ie, selects) the access network and the core network involved in the requested QoS resource, and then the PD-FE sends a resource initialization request message (for requesting the availability check) to the corresponding TRC according to the foregoing decision result. FE, to check the resource availability of the network involved; TRC-FE checks the availability of the requested resource, that is, determines whether the current resource can meet the current QoS policy requirements, and has availability when satisfied, otherwise the requested resource does not have Availability.

Step 206: The PD-FE performs a final resource admission decision according to the authorization check result of step 204 and the resource availability check result of step 205; the resource admission decision includes restoring the original QoS; step 207, if the final QoS decision policy is in the PE- The FE installs a QoS policy, and the PD-FE sends a resource initialization request message to the PE-FE to install the final QoS policy rule.

Step 208: The PE-FE installs the final policy rule from the PD-FE, and sends the initial resource. Initialize the response to the PD-FE;

Step 209: The PD-FE sends a resource initialization response to the SCF entity.

3 is a flowchart of a resource admission control method according to Embodiment 2 of the present invention. As shown in FIG. 3, in the figure, PD-FE (H) is a home network PD-FE, and PD-FE (V) is a visited network PD- FE; In this example, the resource admission control process of the user in a nomadic or roaming scenario includes the following steps:

Step 301: The user initiates a service request, and sends a request message to the SCF entity to trigger the SCF entity to generate a resource initialization request.

Step 302: The SCF entity determines the QoS resource parameters of the requested service, such as the bandwidth, the service type, and the like, and then sends a resource initialization request message (reserved) to the home network PD-FE (Home), where the message carries the media stream description, the QoS parameter, Restoring information such as indication parameters to request the home network RACF entity to perform QoS resource authorization and reservation;

Step 303: The PD-FE (Home) performs an authorization check on the resource initialization request, including whether the QoS resource of the verification request is consistent with the local operator policy rule and the user subscription information. If the authorization check is passed, the PD-FE (Home) makes an initial policy decision on the service request according to the user subscription information, the local operator policy rule, and the service information;

Step 304: The PD-FE (Home) does not have the requested transport layer resource, and the resource initialization request message is further sent to the visited network PD-FE (Visitor), where the message carries information such as a recovery indication parameter;

Step 305: The PD-FE (Visitor) performs an authorization check on the resource initialization request, including whether the QoS resource of the verification request is consistent with the local operator policy rule.

Step 306, the PD-FE (Visitor) determines the access network and the core network involved in the requested QoS resource, and then the PD-FE (Visitor) sends a resource initialization request message (availability check) to the TRC-FE (Visitor) to check Resource availability of the network involved;

Step 307, PD-FE (Visitor) according to the resource verification result in step 305 and step 306 The resource check results in the final resource acceptance decision. If the requested QoS resource is rejected, the PD-FE (Visitor) sends a resource initialization response message to the PD-FE (Home), which carries the reason for the rejection; PD-FE (Home) forwards the resource initialization response to the SCF entity. A message to inform the SCF entity of the results of the resource admission decision. If the requested QoS resource is allowed, step 308 is performed; wherein the resource admission decision includes restoring the original QoS.

Step 308, the PD-FE (Visitor) sends a resource initialization message to the PE-FE (Visitor) to install the final QoS decision policy;

Step 309, PE-FE (Visitor) installs a final QoS decision policy from PD-FE (Visitor), and sends a resource initialization response to PD-FE (Visitor);

Step 310: The PD-FE (Visitor) sends a resource initialization response to the PD-FE (Home); Step 311: The PD-FE (Home) sends a resource initialization response to the SCF entity.

4 is a flowchart of a resource admission control method according to Embodiment 3 of the present invention. As shown in FIG. 4, in the figure, PD-FE (H) is a home network PD-FE, and PD-FE (V) is a visited network PD- FE; In this example, the resource admission control process of the user in a nomadic or roaming scenario includes the following steps:

Step 401: The user initiates a service request, and sends a request message to the SCF entity, and triggers the SCF entity to generate a resource initialization request.

Step 402: The SCF entity determines a QoS requirement parameter of the requested service, such as a bandwidth, a service type, and the like, and then sends a resource initialization request message (reserved) to the visited network PD-FE (Visitor), where the message carries the media stream description, the QoS parameter, Restoring information such as indication parameters to request the RACF entity to perform QoS resource authorization and reservation;

Step 403: The PD-FE (Visitor) performs an authorization check on the resource initialization request, including whether the QoS resource of the verification request is consistent with the local operator policy rule.

Step 404: The PD-FE (Visitor) determines the access network and the core network involved in the requested QoS resource, and then the PD-FE (Visitor) sends a resource initialization request message (availability check) to TRC-FE ( Visitor ) to check the resource availability of the network involved;

Step 405: Since the PD-FE (Visitor) does not have the user subscription information, the resource initialization request message is further sent to the PD-FE (Home);

Step 406: The PD-FE (Home) performs an authorization check on the resource initialization request, including whether the QoS resource of the verification request is consistent with the local operator policy rule and the user subscription information. If the authorization check is passed, the PD-FE (Home) makes an initial policy decision on the service request according to the user subscription information, the local operator policy rule, and the service information;

Step 407: The PD-FE (Home) sends a resource initialization response to the PD-FE (Visitor), where the message includes an initial policy decision.

Step 408: The PD-FE (Visitor) performs a final resource admission decision according to the check result in step 404 and the verification result in step 407. If the requested QoS resource is allowed, the resource admission decision includes restoring the original QoS, and Go to step 409.

Step 409: The PD-FE (Visitor) sends a resource initialization message to the PE-FE (Visitor) to install the final QoS decision policy.

Step 410, PE-FE (Visitor) installs a final QoS decision policy from the PD-FE (Visitor), and sends a resource initialization response to the PD-FE (Visitor);

Step 411: The PD-FE (Visitor) sends a resource initialization response to the SCF.

FIG. 5 is a flowchart of a service QoS recovery policy performed by the SCF entity of the present invention. As shown in FIG. 5, the process of the service QoS recovery policy of the SCF entity of the present invention includes the following steps:

Step 501: The RACF entity performs a resource availability check; the availability check may be checked according to a set period, or may be checked irregularly, such as by a specific request message, such as initiated by an operator of the operator.

Step 502: When the resource check result of the RACF entity is that there is an idle resource, the RACF entity sends a notification message to the SCF entity, where the message carries idle QoS resource information.

Step 503: The SCF entity enters the previously degraded user service according to the received notification message. The QoS resource recovery decision is performed. Specifically, the SCF entity decides to update the resource information of the service QoS, so that the QoS resource of the degraded user service is improved to achieve the resource standard of the QoS before the degradation; when determining that the QoS resource of the service needs to be restored After receiving the service request from the user, the resource initialization request message sent to the RACF entity carries the indication parameter that allows recovery, and the resource information of the corresponding QoS. If it is determined that the service does not need to be restored, after receiving the service request of the user, the resource initialization request message sent to the RACF entity will carry an indication parameter that is not allowed to be restored.

Step 504: The SCF entity sends an updated service request message to the RACF, where the message carries the updated QoS resource information.

Step 505: The RACF entity performs admission control according to the updated QoS resource information.

The flow shown in FIG. 5 is applicable to the aforementioned first to third embodiments.

6 is a schematic structural diagram of a resource admission control system according to the present invention. As shown in FIG. 6, the SCF entity 60 and the RACF entity 61 are included;

The SCF entity 60 is configured to send a resource request message to the RACF entity 61 after receiving the service request, where the resource request message carries a QoS recovery indication parameter of the service, where the QoS recovery indication parameter is allowed to be restored or not. Allow recovery;

The RACF entity 61 is configured to perform resource availability check according to the resource request message when the QoS recovery indication parameter is allowed to recover, and restore the original QoS when the resource requirement of the QoS recovery is met.

The RACF entity 61 is further configured to: check the current resource availability, and notify the SCF entity 60 when there is an idle resource, and the SCF entity 60 is further configured to: determine, according to the idle resource, whether the QoS of the service is restored, and The decision result is used as a QoS recovery indication parameter of the service.

The foregoing QoS recovery indication parameter is to allow recovery or no recovery; the RACF entity 61 further checks whether the current resource meets the service when the QoS recovery indication parameter is allowed to be restored. QoS recovery requirements.

When the service requests the user to roam or nomad, the SCF entity 60 sends the resource request message to the RACF entity 61 of the home network, and the RACF entity 61 of the home network verifies the requested resource, and forwards the resource request message to the visit. The RACF entity 61 of the network checks the availability of the requested resource by the RACF entity 61 of the visited network, and makes a resource admission decision according to the availability check result and the verification result of the RACF entity 61 of the home network, and in the QoS When the recovery indication parameter is a resource requirement that allows recovery and meets QoS recovery, the original QoS is restored;

The RACF entity 61 of the visited network passes the RACF entity 61 of the home network and feeds back the resource admission result to the SCF entity 60.

Alternatively, when the service requests the user to roam or nomad, the SCF entity 6060 sends the resource request message to the RACF entity 61 of the visited network, and the RACF entity 61 of the visited network performs an availability check on the requested resource, and requests the resource. The message is forwarded to the RACF entity 61 of the home network, and the requested resource is verified by the RACF entity 61 of the home network; the RACF entity 61 of the visited network according to the availability check result and the verification result of the RACF entity 61 of the home network Making a resource admission decision, and restoring the original QoS when the QoS recovery indication parameter is a resource requirement that allows recovery and meets QoS recovery; the RACF entity 61 includes a policy decision function entity PD-FE and a transmission resource control function entity TRC- FE; where

The PD-FE is configured to verify the requested resource;

It should be understood by those skilled in the art that the resource admission control system of the present invention is designed to implement the foregoing resource admission control method, and the implementation functions of the foregoing network elements may refer to the phase of the foregoing method. Understand the description. The connection relationship of the network elements in the resource admission control system of the present invention can be understood by referring to the structural diagram shown in FIG. 1 above, except that the implementation functions of the network elements are different.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A resource admission control method, the method comprising:

If the QoS recovery indication parameter is to allow recovery, the RACF entity performs a resource availability check according to the received resource request message, and restores the QoS of the service when the resource requirement of the QoS restoration is met.

The method according to claim 1, wherein the method further comprises: the RACF entity checking a current resource availability, and notifying the SCF entity when there is an idle resource, where the SCF entity is The idle resource determines whether the QoS of the service is restored, and uses the judgment result as a QoS restoration indication parameter of the service.

The method according to claim 1, wherein the method further comprises: when the service requests the user to roam or nomad, the SCF entity sends the resource request message to the RACF entity of the home network, the RACF of the home network The entity verifies the requested resource, and if it passes the verification, forwards the resource request message to the RACF entity of the visited network, and the RACF entity of the visited network performs the availability check on the requested resource, according to the availability check result and the attribution. The result of the verification of the RACF entity of the network makes a resource admission decision, and restores the QoS of the service when the QoS recovery indication parameter is a resource request that allows recovery and meets QoS recovery;

The method according to claim 1, wherein the method further comprises: when the service requests the user to roam or nomad, the SCF entity sends the resource request message to the RACF entity of the visited network, where the visited network The RACF entity can make the requested resource available. Checking the availability, and forwarding the resource request message to the RACF entity of the home network, and verifying the requested resource by the RACF entity of the home network; the RACF entity of the visited network according to the availability check result and the home network The result of the verification of the RACF entity makes a resource admission decision, and restores the QoS of the service when the QoS recovery indication parameter is a resource requirement that allows recovery and meets QoS recovery;

The method according to any one of claims 1 to 4, wherein the RACF entity comprises a policy decision function entity PD-FE and a transmission resource control function entity TRC-FE; the RACF entity pairs the requested resource The availability check is:

The PD-FE verifies the requested resource; the TRC-FE performs an availability check on the requested resource, and makes a resource admission decision according to the availability check result and the verification result of the PD-FE.

A resource admission control system, comprising an SCF entity and a RACF entity, wherein the SCF entity is configured to send a resource request message to the RACF entity after receiving the service request, where the resource request message carries the service a QoS recovery indication parameter; wherein the QoS recovery indication parameter is to allow recovery or not to allow recovery;

The system according to claim 6, wherein the RACF entity is further configured to: check current resource availability, and notify the SCF entity when there is an idle resource, where the SCF entity is further used to And determining whether the QoS of the service is restored according to the idle resource, and using the judgment result as a QoS recovery indication parameter of the service.

8. The system of claim 6 wherein:

When the service requests the user to roam or nomad, the SCF entity sends a RACF entity to the home network. Sending the resource request message, the RACF entity of the home network verifies the requested resource, and forwards the resource request message to the RACF entity of the visited network, and the RACF entity of the visited network performs the availability check on the requested resource. And performing a resource admission decision according to the availability check result and the verification result of the RACF entity of the home network, and recovering the QoS of the service when the QoS recovery indication parameter is a resource request that allows recovery and meets QoS recovery;

9. The system of claim 6 wherein:

The system according to any one of claims 6 to 9, wherein the RACF entity comprises a policy decision function entity PD-FE and a transmission resource control function entity TRC-FE;

The PD-FE is configured to verify the requested resource;