KR100921771B1 - Resource allocation method in radio network connected to multimedia network - Google Patents

Abstract

The present invention relates to a resource management method in a wireless network connected to a multimedia service network.

In the present invention, in order to provide a multimedia service to a terminal, a control station and a proxy call session control apparatus of a wireless network perform a policy setting procedure. As described above, when a policy is set for the corresponding terminal through the policy setting procedure, the control station performs a policy-based resource allocation process in association with the base station.

Policy, IMS, VoIP, DSA, DSC, Traffic Link Settings, Policy

Description

Resource allocation method in radio network connected to multimedia service network {Network allocation method in radio network connected to multimedia network}

The present invention relates to a resource management method in a wireless network connected to a multimedia service network. More specifically, the present invention relates to a method for allocating and releasing resources to a terminal when a wireless network intends to provide an IP-based multimedia service to a terminal in conjunction with a multimedia service network that is a heterogeneous network.

Currently, in a wireless network such as a Wireless Broadband (WiBro) network, a multimedia service provided in conjunction with a multimedia service network such as an IP Multimedia Subsystem (IMS) network is provided to a data communication service such as an Internet search service. It is a reality that is continuing. Therefore, a method for subscribers to use various multimedia services such as IP-based voice call (Voice of IP, VoIP) service through a wireless network supporting portability and mobility should be sought.

In addition, there is a need for a resource management method considering quality of service (QoS) for a subscriber station so as to provide a quality service when providing such a multimedia service.

An object of the present invention is to provide a resource management method for providing a high quality multimedia service to a terminal in conjunction with a multimedia service network in a wireless network.

Method for managing the resources of the terminal by the control station of the wireless network connected to the network and the multimedia service network according to an aspect of the present invention for achieving the above object,

Setting a policy for the terminal; Allocating a network resource based on the policy to the terminal in association with a base station; Setting a final policy for the terminal; And allocating a radio resource based on the final policy to the terminal in association with the base station.

In addition, a method for controlling a resource of a terminal by a proxy call session controller of a wireless network connected to a multimedia service network according to another aspect of the present invention,

Generating first policy information corresponding to the terminal; Including the first policy information in a first message for granting network resource allocation to the terminal and transmitting the first policy information to a control station of the wireless network; And transmitting a second message to the control station to allow radio resource allocation to the terminal.

According to the present invention, when a wireless network intends to provide various multimedia services to a terminal by interworking with a multimedia service network, the wireless network sets policy information for the terminal and manages resources for the terminal based on the set policy information. Thus, a high quality multimedia service can be provided.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the term "module" described in the specification means a unit for processing at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software.

Now, a resource management method in a wireless network connected to a multimedia service network and a network according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Meanwhile, in the embodiment of the present invention, an IP-based multimedia service subsystem (IP Multimedia Subsystem, IMS) network will be described as an example of a multimedia service network, and a wireless broadband and Wibro network will be described as an example. This does not limit the present invention, the present invention can be applied to other multimedia service networks and wireless networks.

In addition, in the embodiment of the present invention, a multimedia service provided to a terminal is described as an example of an IP-based voice call service (Voice of IP, VoIP), but the present invention is not limited to the present invention, and the present invention is applicable to other multimedia services. This is possible.

Now, a resource management method in a wireless network connected to a multimedia service network and a network according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary network interworking diagram for explaining a WiBro network interworking with an IMS network according to an embodiment of the present invention.

As shown in FIG. 1, one or more IMS networks 110, 120 are connected to a WiBro 210, 220 network.

The IMS networks 110 and 120 interoperate with the WiBro networks 210 and 220 through session initialization protocol (SIP) signaling and provide VoIP services to the portable subscriber station (PSS) 310 and 320. do. In addition, the IMS networks 110 and 120 include an interrogation / serving-call session control function (I / S-CSCF) 111 and 121 for managing subscriber information.

WiBro network 210, 220 is a proxy call session control device (Proxy-Call Session Control Function, P-CSCF) (211, 221) interworking with the IMS network (110, 120) is a heterogeneous network, a router for routing packets (router) 212,222, an access control router (ACR) 213,223 and one or more base stations (Radio Access Station, RAS) 214,224 that perform packet access routing and external agent functions of mobile IP. do. In addition, one or more PSSs 310 and 320 are connected to one RAS 214 and 224.

On the other hand, the P-CSCF (211, 221) performs a policy setting process in conjunction with the ACR (213, 223). To this end, the P-CSCFs 211 and 221 include a policy decision module (PDF) that performs a policy server function, and the ACRs 213 and 223 perform a policy execution module (Policy) that performs a policy client function. Enforcement Function (PEF).

2 is a flowchart illustrating a method of providing a VoIP service to a terminal by interworking with an IMS network in a WiBro system according to an embodiment of the present invention.

Meanwhile, as shown in FIG. 2, the WiBro network is divided into a visit network for the terminals 310 and 320, and the IMS network is divided into a home network for the terminals 310 and 320. .

Referring to FIG. 2, first, a calling terminal (PSS # 1) 310 which attempts to make a call requests a call including traffic connection information to a terminal (PSS # 2) 320 of a called party who wants to make a voice call. The message INVITE is delivered (S101). That is, when the PSS # 1 310 of the calling party forwards the IVITE message to the P-CSCF 211, the P-CSCF 211 performs I / S of the IMS network 110 interworking with the WiBro network 210. The IVITE message is transmitted to the CSCF 111, and the I / S-CSCF 111 transmits the INVITE message to the PSS # 2 320 of the called party.

The PSS # 2 320 of the called party receiving the message transmits a response message 183 (Session Progress) including its own traffic connection information for the session based on the traffic connection information included in the INVITE message. 1 (310).

On the other hand, the PSS # 1 310 of the calling party that receives the 183 (Session Progress) message transmits a message (PRACK) informing of the change to the PSS # 2 (320) when there is a change in traffic connection (S103). In step S104, a response message (OK) corresponding thereto is received from the PSS # 2 320 of the called party. Meanwhile, if there is no change in the traffic connection after the originating PSS # 1 310 receives the 183 (Session Progress) message, steps S103 and S104 may be omitted.

In addition, each terminal (PSS # 1 310, PSS # 2 320) is allocated a network resource by performing a dynamic service addition (DSA) procedure (S105).

When network resources are allocated to each terminal (PSS # 1 310 and PSS # 2 320) according to the DSA procedure, the PSS # 1 310 of the calling party is assigned a network resource as part of the session SIP signaling procedure. The notifying message UPDATE is transmitted to the PSS # 2 320 of the called party (S106). Accordingly, the PSS # 2 320 of the called party transmits a ringing message along with the response message 200 (OK) to the PSS # 2 320 of the calling party (S107 and S108).

Thereafter, the PSS # 1 310 of the calling party transmits a notification message (PRACK) for ringing to the PSS # 2 320 of the called party (S109), and receives a response message 200 (OK) thereof. (S110). In addition, the PSS # 2 320 of the called party transmits a message 200 (OK) indicating that the voice call preparation is completed using VoIP to the P-CSCF 211 of the calling party (S111).

Thereafter, each terminal (PSS # 1 310 and PSS # 2 320) is allocated a radio resource by performing a dynamic service change (DSC) procedure (S112).

If the radio resource is successfully allocated, the PSS # 1 310 of the calling party receives a message 200 (OK) indicating that the session is normally established from the P-CSCF 211 (S113), and the normal session setup is performed. The reply message ACK is transmitted to the PSS # 2 320 of the called party (S114).

Then, each terminal (PSS # 2, PSS # 1) uses a voice call service by exchanging voice packets using the allocated network resources and radio resources.

Next, a policy-based resource allocation method for providing VoIP service in a wireless network according to an embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4.

3 illustrates another resource allocation process according to an embodiment of the present invention, and illustrates an example in which a resource allocation process is performed at the request of a terminal.

In this case, the dynamic service X (DSX) includes a DSA and a DSC, and means a DSA in a network resource allocation step (S105), and a DSC in a radio resource allocation step (S112).

Meanwhile, in the embodiment of the present invention, a radio resource allocation process will be described using the calling terminal 310 as an example, but this may be applied to the called terminal 320.

Referring to FIG. 3, the terminal 310 transmits a message (DSX-Request, DSX-REQ) requesting permission of traffic connection setup (network connection setup or wireless connection setup) to the ACR of the WiBro network 210 to which it is connected. If the transfer to the (213) (S201), the ACR (213) by the P-CSCF (211) of the network 210 by requesting the traffic connection establishment permission for the terminal 310, the terminal 310 as follows: Performs a policy setting process (Policy Procedure) for (S202, S203). Here, the policy setting process is performed by the PDF of the P-CSCF 211 and the PEF of the ACR 213. On the other hand, the policy setting performed in the step of allocating a radio resource (S112) is used to change the policy setting when there is a change in the policy information for the terminal 310, and finally when there is no change in the policy information It is executed to confirm the policy setting and activate it.

Looking at the policy setting process, first, the ACR 213 receiving the DSX-REQ transmits a message requesting permission to establish a traffic connection to the P-CSCF 211 (S202). Here, the message delivered to the P-CSCF 211 by the ACR 213 uses a message (Credit Control Request, CCR) according to the Diameter protocol.

On the other hand, the P-CSCF 211 receiving the CCR message determines whether to allow the traffic connection setting for the terminal 310, and if the traffic connection setting is permitted, packet information and quality of service of the terminal 310 (Quality). Policy information including information of service (QoS) is generated and the generated policy information is transmitted to the ACR 213 (S203). Here, the message used by the P-CSCF 211 to transmit policy information to the ACR 213 uses a message (Credit Control Answer, CCA) according to the diameter protocol similar to the above-described CCR message.

Table 1 and Table 2 show the internal parameters of the policy information according to an embodiment of the present invention, Table 1 shows the packet filtering information of the policy information, Table 2 shows the QoS information.

Table 1. Packet Filtering Information

Table 2. QoS Information

Referring to Table 1, packet filtering information includes a source address, a destination address, a source port number, a destination port number, a protocol, and the like. The source address represents the IP address of the source, and the destination address represents the IP address of the destination. In addition, the source port number and the destination port number indicate the source port and the destination port number at the time of traffic transmission, respectively, and the protocol indicates the protocol used for the traffic transmission between both ends.

Referring to Table 2, QoS information includes codec information, sampling rate, bandwidth, and the like. Codec information is information about a codec used for video and audio between both ends, a sampling rate represents a sampling rate corresponding to each codec, and bandwidth represents a bandwidth occupied by video and audio traffic.

Referring back to FIG. 3, the ACR 213 that has received the CCA message as described above recognizes that the traffic connection is normally established, and interworkes with the RAS 214 based on the received policy information to the corresponding terminal 310. Allocates resources (network resources or radio resources). Then, the terminal 310 transmits a message (DSX-Response, DSX-RSP) indicating that the resource is allocated (S204), and receives a response message (DSX-Acknowledge, DSA-ACK) for this (S205).

Meanwhile, in FIG. 3, the resource allocation is performed by the request of the terminal 310 as an example. However, in the present invention, the resource allocation process is performed by the request of the network 210 instead of the terminal 310 as shown in FIG. 4. It is also possible to carry out.

4 illustrates another resource allocation process according to an embodiment of the present invention, and illustrates an example in which resources are allocated by a network request.

4, before allocating a resource (network resource or radio resource) to the terminal 310, the P-CSCF 211 performs a policy setting process (Policy Procedure) as follows in association with the ACR 213. (S301, S302).

Meanwhile, in FIG. 4, as in FIG. 3, the policy setting process is performed by the PDF of the P-CSCF 211 and the PEF of the ACR 213. In addition, the policy setting performed in the step of allocating a radio resource (S112) is used to change the policy setting when there is a change in the policy information for the terminal 310, and finally when there is no change in the policy information. It is executed to confirm and activate the policy setting.

First, the P-CSCF 211 determines whether to allow traffic connection establishment for the terminal 310, and generates policy information for the corresponding terminal 310 when traffic connection establishment is permitted. In addition, since the traffic connection setting for the terminal 310 is permitted, a message (Re-Auth Request, RAR) for allocating resources to the terminal 310 is transmitted to the ACR 213 (S301). At this time, the RAR message includes policy information generated by the P-CSCF 211. Upon receiving this, the ACR 213 transmits a response message (Re-Auth Answer, RAA) (S302), and accordingly, a policy for the corresponding terminal 310 is set. In this case, the transmitted policy information includes packet filtering information and QoS information shown in Tables 1 and 2 described above.

When the policy setting is completed, the ACR 213 allocates a resource (network resource or radio resource) to the terminal 310 based on the policy information set in association with the RAS 214. Thereafter, the ACR 213 transmits a message indicating that the resource is allocated, that is, a message indicating that the traffic connection setup is completed (DSX-REQ) to the terminal 310 (S303), and sends a response message (DSX-RSP) thereto. By receiving (S304), the resource allocation process for the terminal 310 is completed.

On the other hand, the above-described resource allocation method can be applied not only at the time of initial resource allocation but also in the case of changing the existing allocated resources. Therefore, the aforementioned policy setting method can be applied not only at the time of initial policy setting but also to change an existing policy.

Next, a policy-based resource release method in a wireless network according to an embodiment of the present invention will be described in detail with reference to FIGS. 5 and 6.

On the other hand, when releasing resources allocated on a policy-based basis for VoIP service as described above, the allocated resources are released through a Dynamic Service Deletion (DSD) procedure.

5 is a diagram illustrating another resource releasing process according to an embodiment of the present invention, and illustrates an example in which resources are released by a request of a terminal.

Meanwhile, in the embodiment of the present invention, the resource release process will be described using the calling terminal 310 as an example, but this may be applied to the called terminal 320.

Referring to FIG. 5, when the terminal 310 transmits a message (DSD-REQ) requesting the release of traffic to the ACR 213 (S401), the ACR 213 interworks with the P-CSCF 211 and then performs the next step. The policy release exaggeration is performed as follows (S402, S403). Here, the policy release process is performed by the PDF of the P-CSCF 211 and the PEF of the ACR 213.

Looking at the policy release process, first, the ACR 213 deletes the policy information for the terminal 310 and transmits a message (CCR) requesting deletion of the policy information to the P-CSCF 211 (S402). Upon receiving this, the P-CSCF 211 deletes the policy information of the corresponding terminal 310 and transmits a message (CCA) indicating that the policy information has been deleted to the ACR 213 (S403).

When the policy setting corresponding to the corresponding terminal 310 is released as described above, the ACR 213 releases resources allocated to the corresponding terminal 310 in association with the RAS 212. In addition, the ACR 213 transmits a message (DSD-RSP) indicating the release of resources to the terminal 310 (S404), by receiving a response message (DSD-ACK) for this (S405), the corresponding terminal 310 Complete the release procedure for resources assigned to.

 Meanwhile, in FIG. 5, the resource is released by the request of the terminal 310 as an example. However, in the present invention, the resource release process is performed by the request of the network 210 instead of the terminal 310 as shown in FIG. 6. It is also possible to carry out.

FIG. 6 is a diagram illustrating another resource releasing process according to an embodiment of the present invention, and illustrates an example in which a resource releasing process is performed by a request of a network.

Referring to FIG. 6, the P-CSCF 211 and the ACR 213 perform a process of releasing a policy setting corresponding to the corresponding terminal 310 to release resources allocated to the terminal 310 as follows. (S501 to S504).

First, the P-CSCF 211 transmits a message (RAR) to delete the policy information corresponding to the corresponding terminal 310 to the ACR 213 (S501), and the received ACR 213 receives the corresponding terminal 310. ), And transmits a message (RAA) indicating this and a message (CCR) requesting deletion of the policy information to the P-CSCF 211 (S502 and S503). Upon receiving this, the P-CSCF 211 deletes the corresponding policy information and transmits a message (CCA) indicating that the policy information has been deleted to the ACR 213 (S504). Accordingly, the policy setting corresponding to the terminal 310 is released.

When the policy setting for the terminal is released, the ACR 213 releases the resource allocated to the terminal in association with the RAS 214 and sends a message (DSD-REQ) indicating that the resource is released to the terminal 310. In operation S505, a response message DSD-ACK is received according to operation S506.

The embodiments of the present invention described above are not implemented only through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. Implementation may be easily implemented by those skilled in the art from the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a diagram illustrating network interworking between a mobile communication network and an IMS network according to an embodiment of the present invention.

2 is a flowchart illustrating a method for providing a VoIP service to a terminal in association with an IMS network in a wireless network according to an embodiment of the present invention.

3 is a flowchart illustrating a method for allocating resources to a terminal according to a request of a terminal in a wireless network according to an embodiment of the present invention.

4 is a flowchart illustrating a method for allocating resources to a terminal according to a request of a network in a wireless network according to an embodiment of the present invention.

5 is a flowchart illustrating a method of releasing resources allocated to a terminal at the request of the terminal in a wireless network according to an embodiment of the present invention.

6 is a flowchart illustrating a method of releasing resources allocated to a terminal according to a request of a network in a wireless network according to an embodiment of the present invention.

Claims (16)

In a method of controlling a resource of a terminal by a control station of a wireless network connected to a multimedia service network, Setting a policy for the terminal in association with a proxy call session control apparatus of the wireless network; Allocating network resources to the terminal in association with the base station based on the policy; Setting a final policy for the terminal in association with the proxy call session controller; And Allocating radio resources to the terminal in association with the base station based on the final policy; Resource management method comprising a. The method of claim 1, Receiving a policy release request for the terminal; Releasing the final policy for the terminal; And Releasing the network resource and the radio resource allocated to the terminal; Resource management method comprising a. The method of claim 2, The policy release request is received from the terminal. The method of claim 2, The policy release request is received from the proxy call session controller. The method of claim 1, Receiving a network connection request from the terminal Resource management method further comprising. The method of claim 5, Setting the policy, Receiving information corresponding to the policy from the proxy call session controller; Resource management method comprising a. The method of claim 6, Setting the policy, When the network connection request is received, requesting the network call establishment permission for the terminal to the proxy call session controller. Resource management method further comprising. The method of claim 1, Setting the final policy for the terminal, Receiving information corresponding to the final policy from the proxy call session controller; And Setting the final policy based on the information corresponding to the final policy Resource management method comprising a. The method of claim 8, Setting the final policy for the terminal, Receiving a request for establishing a wireless connection from the terminal; And Requesting permission of the wireless connection establishment to the terminal from the proxy call session controller; Resource management method further comprising. The method of claim 9, The information corresponding to the final policy includes packet filtering information and quality of service information. The method according to any one of claims 1 to 10, The multimedia service network is an IP-based multimedia subsystem network resource management method. The method of claim 11, The wireless network is a WiBro network resource management method. A method of controlling a resource of a terminal by a proxy call session controller of a wireless network connected to a multimedia service network, Generating first policy information corresponding to a policy of the terminal when the terminal is allowed to establish a traffic connection; Transmitting a first message including the first policy information to a control station of the wireless network to set a policy for the terminal and grant network allocation to the terminal; And Delivering a second message to the control station allowing radio resource allocation to the terminal; Resource management method comprising a. The method of claim 13, Receiving a permission request for the network resource allocation from the terminal Resource management method further comprising. The method of claim 14, Generating a second policy information corresponding to the changed policy when the policy for the terminal is changed; And Including the second policy information in the second message. Resource management method further comprising. The method of claim 14, And the first message and the second message are messages based on a diameter protocol.

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