CN101064863A - Method and system for providing media resource service in IMS network - Google Patents

Abstract

The invention provides a method and a system for providing media resource services under an IMS network. The method is as follows: the IMS network is provided with an application server, a service call service control function entity, a media resource function controller, and a media resource function processor, wherein the connection between the media resource function controller and the media resource function processor An interface is set to support the indication of media resource preparation. When the IMS network provides media resource services, a session is established between the application server and the media resource function controller in a resource reservation manner through the interface. Through the present invention, when the IMS network provides media resource services to users, resource reservation processing is introduced in the session establishment between AS~MRFC, thereby improving the reliability of media resource services; the network provides insufficient bandwidth for media files, etc. In some cases, prefetching in advance improves the quality of media resource services.

Description

Method and system for providing media resource service under IMS network

technical field

The invention relates to an IMS network, in particular to a method and system for providing media resource services under the IMS network.

Background technique

Today, with the rapid development of communication and IT technology, with the emergence of IP technology across the link layer transmission medium and the rapid popularization of Internet applications, people are no longer satisfied with a single voice communication method, but need a new multimedia communication method , the IP-based mobile communication network and fixed communication network, and the integration of the Internet and telecommunication networks have undoubtedly become the industry's recognized development direction.

In order to meet the general needs of increasingly prominent IP multimedia applications, the IP Multimedia Subsystem (IMS) of the all-IP service network architecture introduced by 3GPP (3rd Generation Partnership Project; third-generation mobile communication standardization partner project) based on the packet bearer network : IPMultimedia Subsystem), the goal is to shield user access methods according to personalized user data, control the openness of service capabilities, and provide multimedia communication experience.

IMS is a subsystem superimposed on the existing packet domain in the WCDMA network added in the 3GPP R5 stage. The packet domain is used as the bearer channel for upper layer control signaling and media transmission, and the Session Initiation Protocol (SIP: Session Initiation Protocol) is introduced. As a service control protocol, it uses the features of SIP, which is simple, easy to expand, and convenient for media combination, and provides rich multimedia services by separating service control from bearer control.

The main functional entities in IMS include call session control entity (CSCF: Call Session Control Function), which controls functions such as user registration and session control; application server (AS: Application Server), which provides various business logic control functions; home subscriber server (HSS : Home Subscriber Server), centralized management of user subscription data; Media Gateway Control Function (MGCF: Media Gateway Control Function)/IP Multimedia Gateway (IM-MGW: IP Multimedia Media Gateway), used to realize intercommunication with the circuit switched network.

The user accesses the IMS network through the proxy node P-CSCF (Proxy-CSCF; proxy CSCF) at the current location, and the home domain service node S-CSCF (Serving-CSCF; The service control interaction of AS, Media Resource Function Controller (MRFC: Media Resource Function Controller)/Media Resource Function Processor (MRFP: Media Resource Function Processor), provides media resource services for sessions and services.

As shown in FIG. 1 , an architecture diagram of relevant entities providing media resource services for an IMS network. The role of each relevant entity in providing media resource services is described in detail below. in,

The application server AS processes business logic in the process of providing media services, decides which media service to use, and instructs media resource functional entities (including MRFC/MRFP) to control media resources.

S-CSCF, the service call service control function, mainly transfers call processing to the AS according to the initial filter rule (iFC: InitialFilter Criteria).

MRFC/MRFP: The media resource control function mainly receives media resource service requests from S-CSCF and AS, and instructs the media resource processing entity to provide media services. Among them, media resource services include: playback, dual tone multi-frequency (DTMF: Dual Tone Multi Frequency) number collection, automatic speech recognition (ASR: Automatic Speech Recognition), codec conversion, and provision of conference resources. In the above physical structure, the ISC (IP multimedia Service Control) and Mr interfaces use the SIP protocol; while the Mp interface uses the H.248 protocol. in,

Session Initiation Protocol SIP is one of the multimedia communication system framework protocols formulated by IETF (Internet Engineering Task Force). It is an application layer protocol used to establish, change or end multimedia sessions. /Real-time Control Protocol (RTCP: Real Time Control Protocol), Session Description Protocol (SDP: Session Description Protocol), Real-time Streaming Protocol (RTSP: Real Time Streaming Protocol), Domain Name Server (DNS: Domain Name Server) and other protocols cooperate to complete Session establishment and media negotiation in the IMS network; once the session is established, the media stream will be directly transmitted in the bearer layer using the RTP protocol, and multiple media can be flexibly exchanged in one session;

Because SIP is based on open Internet standards, it has natural advantages in the combination and intercommunication of voice and data services. It can realize call control across media and devices, supports rich media formats, and can dynamically add/delete media streams, making it easier to implement richer services. characteristic. At the same time, SIP supports the development of intelligence to the business and terminal side, thereby reducing the burden on the network. It supports application layer mobility functions such as dynamic registration mechanism, location management mechanism, redirection mechanism, and presentation/subscription features, which is convenient for expanding new services. The protocol is simple and has recognized expansion potential. Therefore, it is more and more used in IMS network and next generation network (NGN: Next Generation Network).

With the expansion of the application range of the SIP protocol, the IETF has defined multiple extensions of the SIP to meet new requirements, including new methods and header fields, which involve resource reservation methods.

The IMS network requires a quality of service (QoS: Quality of Service) guarantee for user services. RFC3312 defines a mechanism for QoS resource reservation during the establishment of a SIP session. Figure 2 shows the flow chart of QoS resource reservation, and the process of establishing a session in resource reservation mode. By adopting the resource reservation method to establish a session, it can ensure that both parties in the session have the opportunity to prepare resources, and can ensure that once the session is established, no resources will not be available.

The H.248 protocol is defined by the ITU-T SG16 standard organization and is specially used for media resource control. It can be used to control media processing equipment such as media gateways and media servers.

The basic principle of the H.248 protocol is to abstract various resources on the media processing device into terminals, which are further divided into physical terminals and temporary terminals. Among them, physical terminals represent some physical entities with semi-permanent existence, such as time division multiplexing (TDM: Time Division Multiplex) time slots; temporary terminals represent public resources released after temporary application for use, such as RTP streams. The combination between terminals is abstracted as context, and topology is used to describe the relationship between terminals. Based on these abstractions, call connection is actually an operation on the terminal and context, and is completed through command requests and responses between the media control device and the media processing device. Commands include addition, modification, deletion, notification, etc.; command parameters are called descriptions symbols, classified into properties (Property), signals (Signal), events (Event), statistics (Statistic), and parameters with business relevance are logically aggregated into a package (Package). A packet is a method provided by the H.248 protocol to extend protocol functions.

Resource reservation refers to the reservation of certain service resources for the session in advance to ensure the quality of media service during the establishment of session bearer, so as to ensure the quality of service in the service. The resource reservation described in this document includes the following aspects:

Reservation of media processing resources: mainly includes the reservation of codec resources and conference audio mixing resources. The resources that may be required by the resource application from the application server AS are a codec list, or a conference audio mixing resource for multiple parties expected.

Bearer bandwidth resource: In order to ensure the quality of media service, media processing equipment provides guarantees for IP bearer in terms of bandwidth and service priority. It needs to be reserved in advance on the media processing device to ensure the quality of service.

Media service content resource: The media service content specified by the application server AS may be a local audio file or a network file. In order to ensure that there will be no problems with the content of media resources when the media processing device provides services, it is necessary to check whether the local and network files exist in advance; to ensure the quality of service, the network files can be prefetched and cached in advance to ensure the quality of service as expected Effect. For text-to-speech (TTS: Text To Speech), in order to ensure the quality of voice playback, voice conversion needs to be performed in advance.

In this way, in the process of providing media resource-related services on the IMS network, a session process between the application server AS and the media resource function controller MRFC needs to be established to ensure the reliability of the process.

In the prior art, when the application server AS applies for media processing resources, the establishment of the session between the AS and the MRFC does not adopt the process of resource reservation. The session establishment between the AS and the MRFC is described below by taking the announcement process flow as an example. As shown in FIG. 3 , it is a flow chart of resource application and use for the session between the AS and the MRFC in the existing announcement process.

As shown in the figure, in steps 1 to 3, the user equipment (UE: User Equipment) initiates an INVITE call request, and the S-CSCF triggers the service on the AS according to the initial filtering rule iFC; CSCF processing fails; step 8, the application server AS triggers the announcement application process; steps 9-12, AS instructs MRFC to negotiate media resource SDP; steps 13-18, application server AS according to the SDP information negotiated between AS and UE Conduct session negotiation with the user terminal; step 19, prepare for QoS establishment and resource reservation; step 20-23, modify the QoS state after the QoS preparation is completed; step 24-25, respond to the invite message; step 26- 27, a confirmation message to the MRFC; step 28, an announcement is made; steps 29-30, a confirmation message from the UE. In addition, after sending each INVITE message, a 100trying message will be replied, which is not shown in the figure.

Although QoS establishment and resource reservation preparation are mentioned in the prior art, this only refers to the preparation of user-side access channel resources. Seen from this process, there is a lack of procedures for resource reservation and playback resource preparation between the AS and MRFC.

As can be seen from the above process, the disadvantages of the prior art are:

1. The SDP information negotiated between UE and AS is not updated on MRFC. Therefore, it is only applicable to the case where SDP contains a single codec or MRFC only selects one codec in the codec list.

2. When network side resources need to have QoS preparation and media resource preparation, this process cannot meet the network side QoS establishment and media resource preparation process, and the process will fail at the end.

Contents of the invention

The purpose of the present invention is to provide a method and system for providing media resource services under the IMS network, so that when the IMS network provides media resource services to users, resource reservation processing is introduced in the session establishment between AS ~ MRFC, thereby improving The reliability and quality of media resource services.

The present invention provides a method for providing media resource services under an IMS network. The IMS network is provided with an application server, a service call service control function entity, a media resource function controller, and a media resource function processor, wherein the media resource An interface is set between the function controller and the media resource function processor to support and indicate the media resource preparation. When the IMS network provides the media resource service, when the IMS network provides the media resource service, the connection between the application server and the media resource function controller To establish a session between, including steps:

The application server triggers the media resource service;

Negotiation between the application server and the media resource function controller in the way of resource reservation;

The user equipment establishes the quality of service, and the media resource function processor prepares media resources and bearer resources.

The media resource preparation at least includes: file prefetching and/or caching, or advance notification of text content for text-to-speech processing.

The media resource preparation is realized by means of an extended H.248 packet. The extended H.248 packet at least indicates prefetching and/or caching, or notifies the path and name of the file in advance, and reports the operation result.

The extended H.248 package includes at least: attributes, events, signals, statistical information and procedure parameters.

The signal parameters include at least:

Acquire file signal: used to instruct the media resource processing device to acquire media resource files and report according to the operation results;

Cache file signal: used to instruct the media resource processing device to obtain and cache the media resource file;

Notification content signal: used to notify the resource processing device of the text-to-speech content in advance, and perform the conversion in advance.

Also includes steps:

The resource preparation status is exchanged between the application server and the media resource function controller, and the media resource function processor reports the media resource preparation result and the bearer resource establishment result;

The application server instructs the media resource function controller to provide services for the user;

The media resource function controller instructs the media resource function processor to perform media services.

The application server triggers the media resource service, including steps:

After receiving the user's session establishment request, the service call session control function entity sends a session establishment request message to the application server after judging according to the user's initial filtering rules;

After receiving the session establishment request message, the application server triggers the media resource service according to the business logic.

The session description protocol negotiation between the application server and the media resource function controller is carried out in the way of resource reservation, including steps:

The application server sends a session establishment request message to the service call service control function entity, and then sends the session establishment request message to the corresponding media resource function controller;

After receiving the session establishment request message, the media resource function controller instructs the media resource function processor to reserve media processing resources;

The media resource function processor confirms the bearer according to the provision response message of the application server, and prepares the media resource.

According to the method, the media resource function controller instructs the media resource function processor to reserve media processing resources, including steps:

The media resource function controller sends an add endpoint request message to the media resource function processor, wherein the endpoint add request message carries endpoint bearer information;

After receiving the endpoint addition request message, the media resource function processor sends an endpoint addition response message to the media resource function controller.

According to the method, the media resource function processor confirms the bearer according to the providing response message of the application server, and prepares the media resource, including steps:

After receiving the add endpoint response message, the media resource function controller sends a temporary response message to the application server, and the application server sends a provision response message to the media resource function controller after receiving the temporary response message;

After receiving the provision response message, the media resource function controller sends a modification request message to the media resource function processor, wherein the modification request message carries media resource preparation information;

After receiving the modification request message, the media resource function processor sends a modification response message to the media resource function controller;

After receiving the modification response message, the media resource function controller sends a response message to the application server.

According to the method, the media resource function processor reports the media resource preparation result and the bearer resource establishment result, including steps:

The media resource function processor sends a report request message to the media resource function controller;

After receiving the report request message, the media resource function controller sends a report response message to the media resource function processor.

According to the method, the media resource function controller instructs the media resource function processor to perform media services, including the steps of:

The media resource function controller sends a modification request message to the media resource function processor;

After receiving the modification request message, the media resource function processor sends a modification response message to the media function controller;

The media resource function handler provides media services.

The present invention also provides a system for providing media resource services under an IMS network. The IMS network includes an application server, a service call service control function entity, a media resource function controller, and a media resource function processor, wherein the media resource function The interface between the controller and the media resource function processor is used to support indication of media resource preparation.

The media resource preparation at least includes: file prefetching and/or caching, or text-to-speech processing text content advance notification.

The media resource preparation is realized by means of an extended H.248 packet. The extended H.248 packet at least indicates prefetching and/or caching, or notifies the path and name of the file in advance, and reports the operation result.

The extended H.248 package includes at least: attributes, events, signals, statistical information and procedure parameters.

The signal parameters include at least:

Acquire file signal: used to instruct the media resource processing device to acquire media resource files and report according to the operation results;

Cache file signal: used to instruct the media resource processing device to obtain and cache the media resource file;

Notification content signal: used to notify the resource processing device of the text-to-speech content in advance, and perform the conversion in advance.

According to this system, the media resource function controller receives the session establishment request message sent by the application server, and then instructs the media resource function processor to reserve media processing resources; , and prepare media resources.

According to the system, the media resource function controller instructing the media resource function processor to reserve media processing resources refers to: the media resource function controller sends an add endpoint request message to the media resource function processor, wherein the add endpoint request message carries The endpoint bears information; after receiving the add endpoint request message, the media resource function processor sends an add endpoint response message to the media resource function controller.

According to the system, the media resource function processor confirms the bearer according to the provision response message of the application server and prepares the media resource, which means:

After receiving the add endpoint response message, the media resource function controller sends a temporary response message to the application server, and the application server sends a provision response message to the media resource function controller after receiving the temporary response message;

After receiving the provision response message, the media resource function controller sends a modification request message to the media resource function processor, wherein the modification request message carries media resource preparation information;

After receiving the modification request message, the media resource function processor sends a modification response message to the media resource function controller;

After receiving the modification response message, the media resource function controller sends a response message to the application server.

According to the system, the media resource function processor reports the media resource preparation result and the bearer resource establishment result, wherein the media resource function processor sends a report request message to the media resource function controller; the media resource function controller receives the report request message After that, send a report response message to the media resource function processor.

According to the system, the media resource function controller instructs the media resource function processor to perform media services, wherein the media resource function controller sends a modification request message to the media resource function processor; after receiving the modification request message, the media resource function processor The device sends a modification response message to the media function controller; the media resource function processor provides media services.

Through the present invention, when the IMS network provides media resource services to users, resource reservation processing is introduced in session establishment between AS-MRFC, thereby improving the reliability of media resource services;

In the case of insufficient bandwidth such as media files provided by the network, prefetch in advance to improve the quality of media resource services;

In the case of text-to-speech (TTS: Text To Speech), you can indicate the content of the playback converted text in advance to ensure the timeliness of sending the text to the user after conversion.

Description of drawings

FIG. 1 is a schematic structural diagram of a system for providing media resource services by an IMS network;

FIG. 2 is a flowchart of QoS resource reservation;

Fig. 3 is the flow chart that the session between AS and MRFC carries out resource application and use in the existing playback process;

Fig. 4 is the flowchart of session establishment between AS～MRFC of the present invention;

Fig. 5 is a flow chart of session establishment between AS-MRFC during the announcement process of the embodiment of the present invention.

Detailed ways

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

The invention provides a method and a system for providing media resource services under an IMS network.

The system includes an application server AS, a Serving Call Service Control Function (S-CSCF) entity, a Media Resource Function Controller MRFC and a Media Resource Function Processor MRFP, wherein the interface between the MRFC and the MRFP is used to support indicating the media resource Preparations are made so that when the IMS network provides media resource services, a session is established between the application server AS and the MRFC in a resource reservation manner through this interface.

In this system, the MRFC receives the session establishment request message sent by the AS, and then instructs the MRFP to reserve media processing resources; the MRFP confirms the bearer according to the response message provided by the AS, and prepares the media resources. in,

MRFC instructing MRFP to reserve media processing resources refers to: MRFC sends an increase endpoint request message to MRFP, wherein the increase endpoint request message carries the endpoint bearer information; after receiving the increase endpoint request message, MRFP sends an increase endpoint response message to MRFC.

The MRFP confirms the bearer according to the offer response message of the AS and prepares the media resources, which means: after the MRFC receives the add endpoint response message, it sends a provisional response message to the AS, and after the AS receives the provisional response message, it sends a provision response message to the MRFC ;

After receiving the provision response message, the MRFC sends a modification request message to the MRFP, wherein the modification request message carries media resource preparation information;

After receiving the modification request message, the MRFP sends a modification response message to the MRFC;

After receiving the modification response message, the MRFC sends a response message to the AS.

The MRFP can report the media resource preparation result and the bearer resource establishment result, wherein the MRFP sends a report request message to the MRFC; after receiving the report request message, the MRFC sends a report response message to the MRFP.

MRFC instructs MRFP to perform media services, wherein, MRFC sends a modification request message to MRFP; after receiving the modification request message, MRFP sends a modification response message to MRFC; MRFP provides media services.

The method is as follows: an application server AS, a serving call service control function (S-CSCF) entity, a media resource function controller MRFC and a media resource function processor MRFP are set in the IMS network, wherein the interface between the MRFC and the MRFP It is used to support the indication of media resource preparation. When the IMS network provides media resource services, the resource reservation mode is used to establish a session between the application server AS and MRFC through this interface.

The aforementioned media resource preparation at least includes: file prefetching and/or caching, or text-to-speech TTS processing text content advance notice.

The media resource preparation is realized by means of an extended H.248 packet. The extended H.248 packet at least indicates prefetching and/or caching, or notifies the path and name of the file in advance, and reports the operation result.

The extended H.248 package includes at least: attributes, events, signals, statistical information and procedure parameters.

Wherein, the signal parameters include at least:

Acquire file signal: used to instruct the media resource processing device to acquire media resource files and report according to the operation results;

Cache file signal: used to instruct the media resource processing device to obtain and cache the media resource file;

Notification content signal: used to notify the resource processing device of the text-to-speech content in advance, and perform the conversion in advance.

In this embodiment, the extended H.248 package is as follows:

Package Name: Media Resource Prepare

PackageID (package identification): mrp (0x?)

Description: Use this package to prepare media resources

Version (version): 1

Properties

none.

Events:

1) preparation failure (failure to prepare)

Event name (event name): preparation failure (preparation failure)

EventID (event identification): fail (0x?)

Description: Resource preparation failed

EventDescriptor parameters (event description parameters):

none

ObservedEventDescriptor parameters (observed event description parameters):

Parameter Name (parameter name): Return Code (return code)

Parameter ID (parameter identification): rc(0x?)

Description (Description) : Indicates the reason for the failure.

Define return codes as follows:

              0x01-The resource does not exist

                  0x02-The resource cannot be obtained

0x03-Insufficient bandwidth

0x04-Others

Type (type) : integer

Optional: No

2) Preparation Success (operation successful)

Event name (event name): Preparation Success (successful operation)

EventID (event ID): suc(0x?)

Description: The operation was successful.

EventDescriptor parameters (event description parameters):

none

ObservedEventDescriptor parameters (observed event description parameters):

Parameter 1 operation result

Parameter ID (parameter identification): res(0x?)

Description (Description): operation result

Type (type): enum (enumeration)

Possible value (possible value):

"normal" (0): Normal.

Signals:

1) Signal get

Signal name (signal name): get (get file)

SignalID (signal identification) : get(0x?)

Description (Description) : Get the file locally

SignalType (signal type): default value BR (send this action to execute until it is completed).

Parameter name (parameter name) to obtain the file identification

Parameter Name (parameter name): file name (get file ID)

ParameterID (parameter identification) : fn(0x?)

Description (Description): This parameter is used to describe the file location and file storage

The file name, the parameter format can be in the following three forms:

I. Files that can be directly accessed locally, such as filename.3gp.

II. Files accessed through file:// ,

For example, file: //huawei/filename.3gp

III. Files accessed via http:// ,

Such as http://huawei/filename.3gp

Type (type): String (string)

Optional (optional): no

Possible values (possible values): file identification

Default (whether there is a default value): no

2) signal cache

Signal name (signal name): cache (cache file)

SignalID (signal identification) : cache (0x?)

Description (Description) : Cache the file locally

SignalType (signal type): default value BR (send this action to execute until it is completed).

Parameter name (parameter name) cache file identifier

Parameter Name (parameter name): file name (cache file identifier)

ParameterID (parameter identification) : fn(0x?)

Description (Description): This parameter is used to describe the file location and file storage

The file name, the parameter format can be in the following three forms:

I. Files that can be directly accessed locally, such as filename.3gp.

II. Files accessed through file:// ,

For example, file: //huawei/filename.3gp

III. Files accessed via http:// ,

Such as http://huawei/filename.3gp

Type (type): String (string)

Optional (optional): no

Possible values (possible values): file identification

Default (whether there is a default value): no

Parameter name (parameter name) cache file identifier

Parameter Name (parameter name): size (cache size)

ParameterID (parameter identification) : size(0x?)

Description: This parameter is used to

Describe the size of the cache, in bytes

Type (type): int (integer)

Optional (optional): no

Possible values (possible values): >0

Default (whether there is a default value): no

3) Signal Notify

Signal name (signal name): Notify (notification content)

SignalID (signal identification) : not(0x?)

Description (Description) : Notify the content of text-to-speech

SignalType (signal type): default value BR (send this action to execute until it is completed).

Parameter name (parameter name) cache file ID or string

Parameter Name (parameter name): content (cache file ID)

ParameterID (parameter identification) : con(0x?)

Description: This parameter is used to describe the file location where the file is stored or

The text content, the parameter format can be in the following forms:

I. Files that can be directly accessed locally, such as Loc: filename.txt.

II. Files accessed through file:// ,

For example, file: //huawei/filename.txt

III. Files accessed via http:// ,

Such as http://huawei/filename.txt

IV. Text content, such as: CON: how are you

Type (type): String (string)

Optional (optional): no

Possible values (possible values): file identification

Default (whether there is a default value): no

Statistics: None.

Procedures:

The media resource control device can instruct the media resource processing device to obtain the media resource file through the get signal, and report it according to the operation result; through the cache signal, it can instruct the resource processing device to obtain and cache the media resource file; through the notify signal, it can notify the resource processing device in advance of the existing Content that is text-to-speech and converted in advance.

When the IMS network provides media resource services, a session is established between the application server AS and the media resource function controller MRFC in a resource reservation manner.

In the process of channel establishment, the resource reservation method is introduced, and the codec reservation is guaranteed by providing and responding through SDP. During QoS establishment such as channel opening by the UE, the media resource processing device also completes the corresponding QoS process, including media resource preparation functions (file prefetch/cache function, TTS processing text content advance notification), and bearer bandwidth guarantee.

FIG. 4 is a schematic diagram of a session establishment process between AS and MRFC in the present invention. As shown in the figure, establishing a session between the application server AS and the media resource function controller MRFC includes steps:

Step 1, the application server AS triggers the media resource service, including steps:

After receiving the user's session establishment request, the S-CSCF entity sends a session establishment request message to the application server AS after making a judgment according to the user's initial filtering rule iFC;

After receiving the session establishment request message, the application server AS triggers the media resource service according to the business logic.

Among them, the application server AS will adopt the back-to-back user agent (B2BUA: Back-to-Back UserAgent) mode, and establish SIP sessions between UE-AS and AS-MRFC respectively. When triggering the media resource service, the AS decides to initiate a session to the corresponding MRFC according to the service type, and at the same time, it can determine the required resource type. For example: when applying for the playback service, you can know the file name and path of the playback, etc.

Wherein, the establishment of the session between the UE-AS can be performed according to the existing technology, which will not be repeated here.

In steps 2-13, AS-MRFC conduct SDP negotiation in resource reservation mode, and instruct MRFP to perform resource reservation, establishment and media resource preparation through H.248 message. Proceed as follows:

The AS sends a session establishment request (Invite) message to the S-CSCF entity (see step 2), and then sends the Invite message to the corresponding MRFC (see step 3);

After the MRFC receives the Invite message, it sends an increase endpoint request (AddReq(Context ID=?, Termination ID=?)) message to the MRFP (see step 4), wherein the AddReq message carries parameters for the endpoint bearer information. This implementation In the AddReq message in the example, by setting the reserve group (reserve group) and the reserve value (reserve value) to TRUE, the codec resources are reserved for the channel according to the codec list;

After the MRFP receives the AddReq message, it sends an increase endpoint response AddResp (Context ID=C1, Termination ID=T1) message to the MRFC (see step 5);

After receiving the AddResp message, MRFC sends a provisional response (183 Session Progress) message to AS. After receiving the 183 Session Progress message, AS sends a provision response (PRACK) message to S-CSCF, and then sends it to MRFC (see steps 6-9) ;

After the MRFC receives the PRACK message, the MRFC sends a modification request (ModReq(Context ID=C1, Termination ID=T1)) message to the MRFP (see step 10),

After the MRFP receives the ModReq message, it sends a modification response message (ModResp(Context ID=C1, Termination ID=T1) to the MRFC (see step 11);

After receiving the ModResp message, the MRFC sends a response (200 OK) message to the application server AS (see steps 12-13).

Wherein, in the ModReq message, by carrying the prefetch file signal mrp/get (that is, the extended H.248 packet), instruct MRFP to obtain the media service file in advance; or by caching the file signal mrp/cache, instruct MRFP to cache the The media file used; or use the notification content signal mrp/not to instruct MRFP to notify the text content to be converted.

In step 14, UE establishes QoS, and MRFP prepares media resources and bearer resources.

In this process, the UE will establish the bearer on the access side, such as using a General Packet Radio System (GPRS: General Packet Radio system) network, and will perform operations such as channel activation.

MRFP prepares network bearer resources and media service content resources. Such as obtaining cached network files.

Steps 15-22, exchange resource preparation between AS and MRFC, and MRFP reports media resource preparation result and bearer resource establishment result, the steps are as follows:

MRFP sends report request (NotReq(Context ID=C1, Termination ID=T1)) message to MRFC (see step 19);

After receiving the NotReq message, the MRFC sends a report response (NotResp (Context ID=C1, Termination ID=T1)) message to the MRFP (see step 20).

Wherein, the MRFP reports the resource preparation result through the media resource preparation packet, that is, the preparation result event in the extended H.248 packet, according to the media resource preparation situation.

Steps 15-18, 21-22, exchange resource preparation status in the SIP session to prepare for providing media services, as shown in the figure, and will not be described here.

Steps 23-24, AS instructs MRFC to provide services for users:

The AS sends an acknowledgment message (ACK) to the S-CSCF entity (see step 23); the S-CSCF entity sends the ACK message to the MRFC (see step 24).

Steps 25-26, MRFC instructs MRFP to perform media services:

MRFC sends a modification request (ModReq(Context ID=C1, Termination ID=T1)) message to MRFP (see step 25); after MRFP receives the ModReq message, MRFP sends a modification response (ModResp(Context ID=C1, Termination ID=T1 )) message to MRFC (see step 26).

In step 27, the MRFP provides media services.

As shown in FIG. 5 , the establishment of a session between AS and MRFC in the present invention is described by taking the playback process as an example. As shown in the figure, the UE side and related entities forwarding UE SIP messages are omitted; [1][2] represent the session between UE-AS and the session between AS-MRFC respectively; SDP_1, SDP_2, SDP_3, SDP_4 respectively Indicates several SDPs in the negotiation process.

As shown in the figure, in steps 1 to 3, the UE sends a session establishment request (Invite) message to the S-CSCF. After the S-CSCF receives the Invite message, it checks the business rules, triggers the announcement service, and transmits the service through the Invite message. Forward to AS;

Step 4: After the AS performs business logic processing, it triggers the playback service;

Steps 5-22, use the resource reservation method to establish a session between UE-AS and AS-MRFC, and start QoS and media service resource preparation; among them, MRFC instructs MRFP to add endpoints to reserve media processing resources, and according to AS The message modifies the codec and prepares playback resources;

Step 23, the UE performs the preparation process of the QoS bearer and the preparation process of the bearer of the MRFP and the announcement resource;

Steps 27-28, MRFP reports the preparation of the playback resource, and reports that the playback file has been successfully obtained by using the operation result event in the extension package;

In steps 24-33 (except steps 27 and 28), the QoS negotiation is completed, indicating that both the UE and the MRFP have met the conditions for QoS guarantee.

In steps 34-37, the Invite message 200 OK is confirmed.

Steps 38-39, the UE sends an acknowledgment (ACK[1]) message;

Steps 40-41, the session confirmation (ACK[2]) message sent by AS to MRFP, indicates that the session is established successfully by these two pairs of messages, and instructs MRFC to play the announcement;

In steps 42-43, MRFC instructs MRFP to perform announcement service, and MRFP performs announcement service (see 44).

It can be seen from the above that by reserving resources and prefetching the playback file, it can be ensured that the playback process can be completed after the user sends an acknowledgment (ACK) message.

The above-mentioned embodiments are only used to illustrate the present invention, but not to limit the present invention.

Claims (22)

1. A method for providing media resource service under IMS network, there are application server, service call service control function entity, media resource function controller and media resource function processor in the IMS network, characterized by that, an interface is set up between the media resource function controller and the media resource function processor, used for supporting and indicating the media resource to prepare, when the IMS network provides the media resource service, establish the conversation between application server and the media resource function controller, including the step:

the application server triggers the media resource service;

the application server and the media resource function controller negotiate in a resource reservation mode;

the user equipment establishes the service quality, and the media resource function processor prepares the media resource and the bearing resource.

2. The method of claim 1, wherein the media resource preparation at least comprises: file prefetching and/or caching, or advance notification of text content of text-to-speech processing.

3. The method of claim 1, wherein the media resource preparation is implemented by using an extended h.248 package, and the extended h.248 package at least indicates prefetching and/or caching, or notifies the path and name of the file in advance, and reports the operation result.

4. The method of claim 3, wherein the extended H.248 package comprises at least: attributes, events, signals, statistics, and protocol parameters.

5. The method for providing a media resource service under the IMS network according to claim 4, wherein the signal parameters at least include:

acquiring a file signal: the system comprises a media resource processing device, a data processing device and a data processing device, wherein the media resource processing device is used for indicating the media resource processing device to acquire a media resource file and reporting the media resource file according to an operation result;

caching file signals: the media resource processing equipment is used for indicating the media resource processing equipment to acquire and cache the media resource file;

notification content signal: the method is used for informing the resource processing equipment of text-to-speech content in advance and carrying out conversion in advance.

6. The method for providing a media resource service under an IMS network according to claim 1, further comprising the steps of:

the resource preparation condition is interacted between the application server and the media resource function controller, and the media resource function processor reports a media resource preparation result and a bearer resource establishment result;

the application server instructs the media resource function controller to provide service for the user;

the media resource function controller instructs the media resource function processor to perform the media service.

7. The method for providing media resource service under IMS network as claimed in claim 1, wherein the application server triggers the media resource service, comprising the steps of:

after receiving a session establishment request of a user, the service call session control function entity sends a session establishment request message to an application server after judging according to an initial filtering rule of the user;

after receiving the session establishment request message, the application server triggers the media resource service according to the service logic.

8. The method for providing media resource service under IMS network as claimed in claim 1, wherein the session description protocol negotiation between the application server and the media resource function controller is performed in a resource reservation manner, comprising the steps of:

the application server sends a session establishment request message to a service call service control function entity, and then sends the session establishment request message to a corresponding media resource function controller;

after receiving the session establishment request message, the media resource function controller instructs the media resource function processor to reserve media processing resources;

and the media resource function processor confirms the load bearing according to the response message provided by the application server and prepares the media resource.

9. The method for providing a media resource service under an IMS network as recited in claim 8, wherein the media resource function controller instructs the media resource function processor to reserve media processing resources, comprising the steps of:

the media resource function controller sends an endpoint adding request message to the media resource function processor, wherein the endpoint adding request message carries endpoint bearing information;

after receiving the endpoint adding request message, the media resource function processor sends an endpoint adding response message to the media resource function controller.

10. The method for providing media resource service under IMS network as claimed in claim 9, wherein the media resource function processor confirms the bearer according to the provision response message of the application server and performs media resource preparation, comprising the steps of:

after receiving the end point increasing response message, the media resource function controller sends a temporary response message to the application server, and after receiving the temporary response message, the application server sends a response providing message to the media resource function controller;

after receiving the providing response message, the media resource function controller sends a modification request message to the media resource function processor, wherein the modification request message carries media resource preparation information;

after receiving the modification request message, the media resource function processor sends a modification response message to the media resource function controller;

and after receiving the modification response message, the media resource function controller sends a response message to the application server.

11. The method of claim 6, wherein the media resource function processor reports the media resource preparation result and the bearer resource establishment result, and the method comprises:

the media resource function processor sends a report request message to the media resource function controller;

after receiving the report request message, the media resource function controller sends a report response message to the media resource function processor.

12. The method for providing media resource service under IMS network as recited in claim 6, wherein the media resource function controller instructs the media resource function processor to perform media service, comprising the steps of:

the media resource function controller sends a modification request message to the media resource function processor;

after receiving the modification request message, the media resource function processor sends a modification response message to the media function controller;

the media resource function processor provides a media service.

13. A system for providing media resource service in IMS network, the IMS network includes application server, service call service control function entity, media resource function controller and media resource function processor, characterized in that, the interface between the media resource function controller and the media resource function processor is used to support the preparation of indication media resource.

14. The system for providing a media resource service under an IMS network as recited in claim 13, wherein the media resource preparation at least comprises: file prefetching and/or caching, or text-to-speech processing text content advance notifications.

15. The system of claim 13, wherein the media resource preparation is implemented by using an extended h.248 package, and the extended h.248 package at least indicates prefetching and/or caching, or notifying the path and name of the file in advance, and reporting the operation result.

16. The system for providing media resource services under an IMS network as claimed in claim 14, wherein the extended h.248 package includes at least: attributes, events, signals, statistics, and protocol parameters.

17. The system for providing media resource services under an IMS network of claim 16, wherein the signal parameters include at least:

acquiring a file signal: the system comprises a media resource processing device, a data processing device and a data processing device, wherein the media resource processing device is used for indicating the media resource processing device to acquire a media resource file and reporting the media resource file according to an operation result;

caching file signals: the media resource processing equipment is used for indicating the media resource processing equipment to acquire and cache the media resource file;

notification content signal: the method is used for informing the resource processing equipment of text-to-speech content in advance and carrying out conversion in advance.

18. The system of claim 13, wherein the media resource function controller receives a session setup request message from the application server, and then instructs the media resource function processor to reserve media processing resources; and the media resource function processor confirms the load bearing according to the response message provided by the application server and prepares the media resource.

19. The system of claim 18, wherein the media resource function controller instructs the media resource function processor to reserve media processing resources by: the media resource function controller sends an endpoint adding request message to the media resource function processor, wherein the endpoint adding request message carries endpoint bearing information; after receiving the endpoint adding request message, the media resource function processor sends an endpoint adding response message to the media resource function controller.

20. The system for providing a media resource service under an IMS network as claimed in claim 19, wherein the media resource function processor confirms a bearer according to a provision response message of the application server and performs media resource preparation, which means:

after receiving the end point increasing response message, the media resource function controller sends a temporary response message to the application server, and after receiving the temporary response message, the application server sends a response providing message to the media resource function controller;

after receiving the providing response message, the media resource function controller sends a modification request message to the media resource function processor, wherein the modification request message carries media resource preparation information;

after receiving the modification request message, the media resource function processor sends a modification response message to the media resource function controller;

and after receiving the modification response message, the media resource function controller sends a response message to the application server.

21. The system of claim 13, wherein the media resource function processor reports a media resource preparation result and a bearer resource establishment result, and wherein the media resource function processor sends a report request message to the media resource function controller; after receiving the report request message, the media resource function controller sends a report response message to the media resource function processor.

22. The system of claim 13, wherein the media resource function controller instructs the media resource function processor to perform the media service, and wherein the media resource function controller sends a modification request message to the media resource function processor; after receiving the modification request message, the media resource function processor sends a modification response message to the media function controller; the media resource function processor provides a media service.

Images