WO2007085199A1

WO2007085199A1 - Method, application and apparatus for identifying user state in networks

Info

Publication number: WO2007085199A1
Application number: PCT/CN2007/000305
Authority: WO
Inventors: Youzhu Shi
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-01-27
Filing date: 2007-01-26
Publication date: 2007-08-02
Also published as: CN101009700A

Abstract

A method, application and apparatus for identifying user state in networks includes: before the call originated by a calling party arrives at a called user terminal, on the entity through which the message that orginates the call passes, determines that the user state of the called user terminal needs to be identified; the available bandwidth resource information of the called user terminal is determined by a corresponding network side entity; then determines on the corresponding network side entity the user state of the called user terminal based on the determined available bandwidth resource information of the user terminal. It ensures that before the call originated by the calling party arrives at the called user terminal, the user state of the called user terminal is determined based on the determined available bandwidth information of the called user terminal. So that the CW, CCBS, CFB services etc. in the IMS packet network may be implemented based on the available bandwidth resource information of the user.

Description

TECHNICAL FIELD The present invention relates to the field of network communication technologies, and in particular, to a technology for identifying a user state in a network.

BACKGROUND OF THE INVENTION At present, with the gradual maturity of packet technology, a traditional telecommunication network based on circuit switching is developing toward a packet-switched broadband telecommunication network, and a SIP (Initial Protocol) is used as a call control signaling for a packet telecommunication core network. It is one of the current technological development trends. Currently, in the research of NGN (Next Genteration Network), the IMS (IP Multimedia Subsystem) network architecture is used as the core network of NGN.

In this new packet telecommunications network, the new packet terminal SIP terminal will gradually replace the traditional terminal telephone. Among them, the existing TISPAN (Telecommunications and Internet Converged Services and Protocols for Advanced Networking) and the services with traditional service features provided to SIP terminal users in the NGN are collectively referred to as PSTN (traditional telephone). Network) /ISDN (Integrated Digital Network) simulation business. TISPAN has established a number of WI (Work Item) to study the simulation services, such as CW (Communication Waiting) service, CCBS (Communication Communication Session Completion) service, and so on.

The CW service is that when a user is called in by an incoming call, and the currently available resources are insufficient to establish the call (that is, the called user is in a busy state of the user), the corresponding called user may be notified to come. Call in, and wait.

The CCBS service is that after the user A calls the user B to be busy (that is, the user B is in the user busy state), the call is not interrupted, and when the user B turns to idle (that is, the user B transfers to the user idle state), The uninterrupted call is re-connected, that is, the communication connection with the user B can be completed without re-initiating a call at this time.

Therefore, the same service triggering condition that the CW service and the CCBS service have are: The network determines that the user is in the user busy state. For the CW service, the network to which the subscriber belongs belongs to the incoming call to the user, and if the user is busy, the user is notified that there is a new incoming call; for the CCBS service, the user B belongs to The network receives the incoming call from user A, and finds that user B is busy, and returns a message indicating that user B is busy to the network to which user A belongs.

In the actual application process, in addition to the CW service and the CCBS service, there are many other application scenarios that require the network to determine that the user is busy, for example, CFB (Busy Call Forwarding) service, CFB service; When the network to which the subscriber belongs belongs, an incoming call to the user is received, and if the user is found to be busy, the incoming call is forwarded to another preset destination.

In the network, it is usually sought that the call has not yet reached the user terminal, and the network can determine whether the user is currently in a busy state or a user idle state. Currently, in TISPAN, the user judged by the network is called NDUB (Network Determined User).

Busy, the network determines the user is busy).

In the IMS packet network, the network determines that the user is busy. The user is busy according to the maximum number of sessions that the user can simultaneously perform. In this implementation manner, the network needs to record the number of sessions that the user has established, and the user can simultaneously perform the same. When the maximum is compared with 3⁄4, it can be judged that the user is in the user busy state or the user is idle state.

However, in the IMS packet network, since the occupied bandwidth resources of different sessions are not fixed, therefore, based on the already established meeting The way in which the number of words determines the state of the user cannot accurately determine the state of the user. In addition, the CW service, the CCBS service, the CFB service, and the like cannot be reliably implemented in the IMS-based packet network.

Summary of the invention

Embodiments of the present invention provide a method, an application, and a device for identifying a user state in a network, so that a user's busy condition can be identified according to a user's available bandwidth resource before the call arrives at the user terminal, thereby satisfying the requirement for carrying out the corresponding service. .

An embodiment of the present invention provides an implementation method for identifying a user state in a network, including:

After the originating call or the call is sent, and the message of the calling process reaches the peer user, the entity on the network side receiving the message determines that the user needs to be identified by the user state;

Determining the available bandwidth resource information of the user by the entity on the network side, and determining the user state corresponding to the user according to the determined bandwidth resource information determined by the user.

An embodiment of the present invention provides an apparatus for identifying a user's state in a network, where the apparatus is disposed on the network side, and is configured to identify a user state before the call process message arrives at the peer user, and the apparatus specifically includes:

An operation processing module: configured to calculate and determine bandwidth resource information currently available to the user;

The decision processing module is configured to determine user status information of the current user according to the currently available bandwidth resource information determined by the operation processing module.

An embodiment of the present invention provides a method for implementing a service based on a user state, including:

After determining that the user state-based service is initiated in the network, the network side identifies the user state of the peer user before the service reaches the peer user, where the user state includes determining according to the available bandwidth resource information of the user;

In the network, an implementation process of the service based on the user state is controlled according to the user state information.

An embodiment of the present invention provides an apparatus for performing a service based on a user status, including a service request message receiving module, a user status receiving module, and a service logic processing module, where:

a service request message receiving module, configured to receive a service request message, and provide the service logic processing module;

a user status receiving module, configured to receive a user status notification message from the user status notification module, obtain a user status determined according to the user's available bandwidth resource information, and provide the status to the service logic processing module;

The service logic processing module is configured to perform service processing based on user status on the received service request message.

It can be seen from the foregoing embodiment of the present invention that the embodiment provided by the present invention can ensure that the called user terminal can be determined based on the available bandwidth resources of the called user before the call initiated by the calling party reaches the called user terminal. The user state can be implemented in order to accurately determine the user's busy operation based on the user-usable bandwidth resources, that is, to facilitate the smooth development of the service triggered based on the user state.

BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic structural diagram of a specific implementation of an apparatus S according to an embodiment of the present invention;

2 is a schematic structural diagram of a specific implementation of a system for applying a device according to an embodiment of the present disclosure;

3 is a schematic diagram 1 of a specific implementation process of the method according to an embodiment of the present invention;

4 is a second schematic diagram of a specific implementation process of the method according to an embodiment of the present invention; FIG. 5 is a third schematic diagram of a specific implementation process of a method according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram 4 of a specific implementation process of a method according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a specific implementation of an apparatus according to an embodiment of the present invention.

Mode for Carrying Out the Invention An embodiment of the present invention provides an IMS-based packet network. When a call has not arrived at a user terminal, the network can determine the busyness of the user based on the currently available bandwidth resources of the user. Processing, so that services such as CW, CCBS, CFB in the top S packet network can be implemented based on user-utilizable bandwidth resource information.

Moreover, since the IMS supports multimedia calls, a conference can include calls of different media types. Therefore, the maximum number of sessions that users can simultaneously perform, the maximum available bandwidth resources, etc. can be different for different media types. Settings. For example, for the maximum number of sessions that the user can simultaneously perform, the corresponding maximum number that can be simultaneously performed can be set separately for different media types, and the maximum available bandwidth resource for the user can also be set correspondingly for different media types. Take advantage of bandwidth resources. In the following description of various embodiments of the present invention, a process of determining a busyness of a user according to a bandwidth resource implementation network will be mainly described.

An embodiment of the apparatus provided by the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1 , the apparatus is disposed on the network side, and is specifically configured to identify the call process message before it reaches the peer user (such as the called user). The user status corresponding to the peer user, for example, may be set in the IMS network for implementing the corresponding user busy decision function. The device specifically includes:

(1) arithmetic processing module

The module is configured to calculate the currently available bandwidth resource information of the user that is required by the decision processing module, and the operation processing module specifically includes:

The user subscription bandwidth acquisition module is configured to obtain the maximum bandwidth information of the user subscription, and provide the calculation to the calculation module, so that the calculation module performs corresponding calculation processing;

The occupied bandwidth determining module is configured to determine, according to a statistical calculation result of the bandwidth information occupied by the session that the user has established, the bandwidth information occupied by the user that has been established by the session, and provide the bandwidth information to the computing module;

The calculation module: calculating a difference between the maximum bandwidth information of the user subscription obtained by the user subscription bandwidth acquisition module and the occupied bandwidth information determined by the occupied bandwidth determination module, and then determining the available bandwidth resource information of the current user according to the difference Specifically, the difference may be directly used as the available bandwidth resource information of the current user, or may be determined according to the difference and the current remaining bandwidth of the network to determine the available bandwidth resource information of the current user;

When the operation processing module is configured in the resource admission control function entity, and the meter module determines the available bandwidth resource information of the current user according to the difference and the current remaining bandwidth of the network, the calculation module may further include the following Two component modules: a difference calculation module: configured to calculate a difference between the maximum bandwidth information of the user subscription and the occupied bandwidth information as remaining unused bandwidth information in the user subscription bandwidth;

The comparison processing module is configured to compare the remaining unused bandwidth information in the user subscription bandwidth with the current remaining bandwidth of the network, and use the smaller one as the available bandwidth resource information of the current user.

In an embodiment of the apparatus of the present invention, the operation processing module is disposed in a resource admission control function entity or a network side entity such as a P-CSCF or an NDUB server. When the operation processing module is in a different network side entity, the corresponding processing method for obtaining the maximum bandwidth information subscribed by the user is different, respectively:

(11) When the operation processing module is set in the resource admission control function entity, the operation processing module obtains the maximum bandwidth information of the saved user subscription locally, or the operation processing module directly communicates with the user service quality subscription database through the 15 interface. Obtain the maximum bandwidth information of the user subscription saved therein;

(12) When the operation processing module is set on the P-CSCF or the NDUB server, the operation processing module communicates with the user service quality subscription database to obtain the maximum bandwidth information of the user subscription signed therein, wherein:

The operation processing module set in the P-CSCF obtains the maximum bandwidth information subscribed by the user directly from the quality of service subscription database through the 16 interface, or obtains the maximum user subscription from the service quality subscription database through the 14 interface and the resource admission control function entity. The bandwidth information may also be obtained by using the 14 interface from the resource admission control function entity to obtain the maximum bandwidth information of the user subscription saved in the latter;

The operation processing module set in the NDUB server obtains the maximum bandwidth information subscribed by the user directly from the service quality subscription database through the 17 interface, or obtains the maximum bandwidth information subscribed by the user from the service quality subscription database indirectly through the intermediate server; or, in the P The saved user subscription maximum bandwidth information can also be obtained locally from the CSCF or NDUB server.

(2) Decision Processing Module

The module is configured to determine user status information of the current user according to the currently available bandwidth resource information determined by the operation processing module, that is, determine that the user is a user busy state or a user idle state;

The decision processing module specifically includes: a minimum bandwidth acquisition module: configured to acquire a minimum bandwidth resource required for establishing a current session, and provide the same to the judgment module; and specifically obtain the minimum value locally saved by the network element where the module is located The bandwidth resource information; or, the user service quality contract database is used to obtain the minimum bandwidth resource information saved therein, or the minimum bandwidth resource information may be obtained by parsing the received session request message;

The judging module compares the available bandwidth resources of the current user provided by the operation processing module with the minimum bandwidth resource, and determines that the corresponding user is a user busy state or a user idle state.

According to the definition of TISPAN, "Network determines user busy (NDUB)" can further subdivide "Network determines that users are close to busy

(Applying NDUB) " , correspondingly, the above minimum bandwidth resource can further subdivide the bandwidth information for judging the user's "busy" and "close to busy". If the current user's available bandwidth resource is less than 1 Κ, then determine "busy" if Less than 8 inches, Bingzhi is "close to busy." The embodiments described in the present invention are equally applicable to the state in which the network recognizes the user "close to busy."

In addition, as described above, for the maximum available bandwidth resource of the user, the corresponding maximum available bandwidth resource may be separately set for different media types, so that different minimum media types may be distinguished for different media types. The bandwidth resource, obviously, the judging module can determine the busy and idle state of the user according to the media type that the current user session request message requires to be established, including a "close to busy" state, for example, the user session request message carries the audio and video media types. After the judgment module processes, the user state is "idle" to establish an audio session and "busy" to establish a video session.

Similarly, in an embodiment of the apparatus of the present invention, the decision processing module is disposed in a resource admission control function entity or a network side entity such as a CSCF or an NDUB server, and the decision processing module and the operation processing module may be set in In the same entity, Separately set in different entities. Set in different entities, the decision processing module obtains the minimum bandwidth resource information in different ways. The following sections will explain:

(21) The decision processing module disposed in the resource admission control function entity directly obtains the minimum bandwidth resource information by directly communicating with the service quality subscription database through the 15 interface;

Or obtaining locally saved minimum bandwidth resource information from the local device;

Alternatively, the decision processing module that is disposed in the resource admission control function entity further includes a resource request message parsing module, configured to parse the resource request message sent by the P-CSCF, and obtain the minimum bandwidth resource information from the parsing result;

(22) The decision processing module disposed in the P-CSCF obtains the minimum bandwidth resource information directly from the quality of service subscription database through the 16 interface, or obtains the indirect access from the service quality subscription database through the 14 interface and the resource admission control function entity. The minimum bandwidth resource information may be obtained by acquiring, by the resource admission control function entity, the minimum bandwidth resource information of the user stored in the latter through the 14 interface, or acquiring the saved minimum bandwidth resource information of the user from the local storage;

(23) the decision processing module set in the NDUB server obtains the minimum bandwidth resource information directly from the quality of service subscription database through the 17 interface, or obtains the minimum bandwidth resource information from the quality of service subscription database indirectly through the intermediate server, or , obtain the saved user signed minimum bandwidth resource information from the local.

At the same time, the decision processing module set in the P-CSCF or the NDUB server further includes a session request message parsing module, configured to parse the received session request message, and obtain the minimum bandwidth resource information from the parsing result.

(3) User status notification module

The device further includes a user status notification module, and notifies the user status of the service control unit that needs the user status processing service or other network element that needs the user status processing session, and the notification of the user status may be explicit or implicit. The notification message received by the service control unit or other network element may be a SIP message or an internal message. If the user status notification module and the service control unit are on the same network entity, the user status may be delivered through the content message. . Similarly, the user status notification module may be separately set in a resource admission control function entity or a network side entity such as a P-CSCF or an NDUB server, and the functions implemented by the following are as follows: When the module is set on the P-CSCF or NDUB server, If the user is in the user busy state, the P-CSCF or NDUB server sends a message indicating that the user is busy; if the user is in the user idle state, the SIP session request message is delivered (ie, the session request or the service request is allowed to pass), or the user is sent A message indicating that the user is idle, or, although the user is currently busy, that is, the user currently has insufficient bandwidth resources to establish the user's current session request, but foreseeable, during an expected time, after some operation, such as releasing the user Established session, etc., the user can utilize the bandwidth resource to satisfy the need to establish the current session request of the user, and then deliver the SIP session request message or send a message indicating that the user is idle;

When the module is set on the resource admission control function entity, if the user is in the user busy state, the resource admission control function entity returns a resource request response message indicating insufficient resources to the P-CSCF, and is sent by the P-CSCF. If the user is in the user idle state, return a resource request response message indicating that the resource is sufficient to the P-CSCF, and the SIP session request message is delivered by the P-CSCF, or a message indicating that the user is idle is sent; or Although the user is currently busy, that is, the user currently has insufficient bandwidth resources to establish the user's current session request, it is foreseeable that the user can utilize the bandwidth resource after an operation such as releasing an established session or the like within an expected time. It will satisfy the need to establish the user's current session request, and will also return a resource request response message indicating sufficient resources to the P-CSCF. For the convenience of describing the specific embodiment of the device according to the present invention, the network logical architecture to which the embodiment of the present invention is applied is also shown. As shown in FIG. 2, FIG. 2 is a network architecture implementation of the NGN based on the IMS definition, in FIG. 2 It specifically includes the following components:

(1) Business Control Unit

The unit is used for providing a logical network element for each type of service that needs to determine the user's busyness as a trigger condition by the network, and the unit serves as a host execution environment for the service, and the characteristic of the service is to channel the session to Sichuan. The user status is: one: the direction of the W road, for example, the CW service control unit for performing the CW service, the CCBS service control unit for performing the CCBS service, and the multi-domain access routing service (the user passes the multi-connection a service control unit that selects an access point route with a user state idle when accessing the inbound point;

The interface between the service control unit and the S-CSCF (Service-Call Session Control Function) is 12 interfaces. In the IMS network, the 12 interfaces are implemented based on the SIP protocol or the internal interface protocol. As a logical function, the service control unit may be an independent network element, or may be located on other network elements, such as the S-CSCF.

In this embodiment, a service control unit device that determines a user busy condition as a trigger condition, that is, a device that can perform a service based on a user state is provided. The result is as shown in FIG. 7, and specifically includes: a service request message receiving module, and a user. a status receiving module, a business logic processing module, and a service request response message sending module, wherein:

The service request message receiving module is configured to receive a service request message and provide the service request message to the service logic processing module, where the service request message is generally an S IP message or an internal message;

The user status receiving module is configured to receive a user status notification message from the user status notification module, obtain a user status, and provide the status information to the service logic processing module;

The service logic processing module performs corresponding service state logic control based on the user status according to the received service trigger message and the user status, such as controlling the call forwarding function.

The service request response message sending module is configured to send a response message of the service request according to the service logic control result, where the response message is generally a SIP message or an internal message.

Further, the service control unit device further includes a user status requesting module, where the user status requesting module is configured to request a user status, and send a message carrying the request indication to the user status notification module, where the request indication may be an explicit user status request indication. And may be an implicit user status request indication, such as a service request indication that the user determines that the user is busy as a trigger condition, or an ordinary session establishment request indication, etc., the message may be an internal message, or a SIP message, or a Diameter message. Wait;

In addition, the foregoing service request message and the user status notification message may be different messages or the same message.

(2) NDUB server

It is used to provide user status information for entities in other networks, such as user busy, user idle, etc. At the same time, it can also judge the current user according to the maximum number of sessions that the user can simultaneously perform and the resources (bandwidth) currently available to the user. The interface between the S-CSCF and the S-CSCF is 13 interfaces. In the IMS network, the 13 interface is the SIP protocol.

As a logical function, the NDUB server may be an independent network element, or may be located on other network elements, such as a service control unit, a service broker, or the like.

(3) S-CSCF (Service-Call Session Control Function)

The main function is to provide a routing control function for the session, which can be implemented by referring to the prior art. (4) P-CSCF (Proxy-Call Session Control Function)

It is mainly used to provide access authentication for users and provide resource request function for resource admission control function for the session, which can be implemented by referring to the prior art;

The II interface between the P-CSCF and the S-CSCF is implemented based on the SIP protocol.

(5) Resource access control function

It is used to provide resource admission control for the session, and comprehensively judge whether the network allows and whether sufficient bandwidth resources are provided to the session according to the service quality subscription data signed by the user and the current network resource status.

The 14 interface between the resource admission control function and the P-CSCF is implemented based on the Diameter (Authentication, Authorization, and Accounting Protocol) protocol.

In the 3GPP (3rd Generation Partnership Project) and the TISPAN standard, the resource admission control function is implemented by multiple functional network elements. These network elements cooperate with each other to provide the media needed for the session. The specific functions and inter-interfaces of these network elements are not included in the description of the embodiments of the present invention, and therefore are not described in detail. In the 3GPP and TISPAN standards, the functional network elements of the resource admission control function and the direct interface of the P-CSCF are respectively called PDF (Policy Decision Function), SPDF (Service-based Policy Decision Function). The policy decision function), 14 interface also refers to the interface of P-CSCF and PDF, SPDF.

(6) User Service Quality Contracting Database

It is used to provide the user's quality of service subscription data, for example, the maximum bandwidth resources subscribed by the user. The quality of service subscription data is sometimes referred to as the QoS profile. The interface between the user service quality subscription database and the resource admission control function is 15 interfaces. In the TISPAN standard, the 15 interface is implemented based on the Diameter protocol. In the 3GPP standard, the 15 interface is based on the MAP (Mobile Application Part). Protocol implementation. The interface between the user service quality subscription database and the P-CSCF is 16 interfaces, and the I& interface is also implemented based on the Diameter protocol. The interface between the user service quality subscription database and the NDUB server is 17 interfaces, and the 17 interface is also implemented based on the Diameter protocol.

As a logical function, the user service quality subscription database may be an independent database network element, or may be located in other network elements or subsystems in the network, such as _HLR (Home Location Register), NASS. (Network Attachment Sub-system), HSS (Home Subscriber Server), etc., can also set different database (such as maximum bandwidth and minimum bandwidth) corresponding database to different networks. In the meta or subsystem.

The following describes an embodiment of the method according to the present invention, which is specifically applied to an IMS-based packet network as an example. The services applicable to the present invention include busy communication session completion service and busy call forwarding service. The communication waiting service is based on the service triggered by the user.

In the embodiment provided by the present invention, when the calling user initiates a call, and the initiated SIP session request message has not arrived at the user terminal, the decision processing module in the network side entity will receive a request message, such as a session request or resource. Begging for news, etc.

At this time, the decision processing module determines the user status according to whether the currently available resource of the called user is sufficient to support the establishment of the current SIP session, and returns a response message indicating the status of the user determined by the network; wherein, the called user is currently available. The resource information is calculated by the operation processing module, specifically according to the current remaining bandwidth of the network and/or the remaining unused bandwidth of the user subscription bandwidth. Information such as bandwidth is calculated to determine the resources currently available to the user.

In the embodiment of the method of the present invention, when the operation processing module and the decision processing module are disposed in different network side entities, the corresponding processing processes are also different, and the two modules are respectively set on different network sides. When the entity is in the middle, the corresponding processing is described. In the following description, it is assumed that there is enough remaining bandwidth in the network, and the current remaining bandwidth of the network is not enough, which is less than the remaining unused bandwidth in the user subscription bandwidth, and the current remaining bandwidth of the network is used as the currently available bandwidth resource of the user. .

(1) Operation processing module

(1) When the operation processing module is set in the resource admission control function, the resource admission control function obtains the maximum bandwidth subscribed by the user from the user service quality subscription database through the 15 interface, or obtains the maximum registered user registration from the local. Bandwidth, and cumulatively calculate the bandwidth occupied by the user's currently established session. Then, subtract the bandwidth occupied by the currently established session from the maximum bandwidth subscribed by the user to obtain the remaining unused bandwidth in the user's subscription bandwidth. Bandwidth resources are currently available.

(2) When the operation processing module is set in the P-CSCF or NDUB server, the P-CSCF or NDUB server cumulatively calculates the bandwidth occupied by the user's currently established session and subtracts it from the maximum bandwidth resource subscribed by the user. The remaining unused bandwidth in the user's subscription bandwidth is obtained as the current available bandwidth resource of the user;

The maximum bandwidth of the user subscription may be preset and stored in the user service quality subscription database. Afterwards, the P-CSCF obtains directly through the 16 interface, or is indirectly obtained through the resource access control function through the 14 interface; the NDUB server directly through the interface Obtain, or indirectly through a corresponding intermediate server, such as a GUP (General User Information) server;

Alternatively, the saved user subscription maximum bandwidth information can be obtained locally from the P-CSCF or NDUB server.

(2) Decision processing module

(1) When the decision processing module is set in the resource admission control function, the corresponding decision processing procedure includes the following process: (11) After receiving the SIP session request message or the SIP subscription message, the P-CSCF a resource request message sent by the resource admission control function;

Specifically, the SIP session request message received by the P-CSCF may carry an indication that the "network determines user busy" function is immediately executed, that is, the network determines an indication that the user is busy, so that the P-CSCF is configured according to the The resource request message may be sent to the resource admission control function. The SIP session request message may not carry the indication. In this case, the P-CSCF unconditionally sends the resource admission control function to the resource. Resource request message;

The indication may be a service category of the service, or an identifier of a network determining user busy function immediately, or an indication of an event package subscribing to a user status;

(12) The resource admission control function determines whether the bandwidth resource currently available to the user is less than the minimum bandwidth required for the establishment of the SIP session:

If the value is less than, the response message indicating the resource request message indicating that the resource is insufficient is returned to the P-CSCF, and after receiving the response message from the resource admission control function, the P-CSCF determines that the response message indicates that the resource is insufficient, and then sends the response message. Indicates the user's busy SIP response code, SIP notification message, or SIP release message.

If not less than, return a response message indicating the resource request message with sufficient resources, and the P-CSCF will deliver the SIP session request message to enable the session to continue to be established, or send a SIP notification message or an SIP advertisement message indicating that the user is idle. ;

Or, if less than, and the bandwidth resources available to the user within a predictable time will become greater than or equal to the SIP session establishment The minimum bandwidth required returns a response message indicating the resource request message with sufficient resources.

The minimum bandwidth information may be obtained by using any one of the following three methods:

The minimum bandwidth information may be preset in a resource admission control function and obtained locally;

The minimum bandwidth information is preset in the user service quality subscription database, and the resource admission control function is obtained through the 15 interface; the minimum bandwidth information is carried in the resource request message, and the P-CSCF is used to control the resource admission control. The resource request message sent by the function is obtained.

(2) When the decision processing module is set in the P-CSCF or NDUB server, the corresponding processing specifically includes:

(21) The P-CSCF or NDUB server receives the SIP session request message or the SIP subscription message;

(22) The P-CSCF or the NDUB server determines whether the currently available resource of the user is smaller than the minimum bandwidth required for the current session establishment, and if not, sends a SIP response code or a SIP notification message or a SIP release message indicating that the user is busy; otherwise, the delivery The SIP session request message to enable the session to continue to be established, or to send a SIP notification message or a SIP release message indicating that the user is idle; or, if less than and within a predictable time, the bandwidth resources available to the user will become greater than or equal to the The S IP session establishes the minimum bandwidth required, and then delivers the SIP session request message or sends a SIP notification message or SIP publish message indicating that the user is idle.

Similarly, the minimum bandwidth may be preset in the user service quality subscription database, and the P-CSCF is directly obtained through the 16 interface, or indirectly through the resource access control function through the 14 interface; or may be received by the P-CSCF. The minimum bandwidth requirement carried in the SIP session request message; the NDUB server directly obtains the minimum bandwidth through the 17 interface, or indirectly through the GUP server to the user service quality subscription database, and may also receive the SIP session request through the NDUB server. The minimum bandwidth requirement carried in the message, or the P-CSCF or NDUB server can also obtain the saved minimum bandwidth requirement locally.

In the above process, if the operation processing module is located in the resource admission control function and the decision processing module is set in the P-CSCF, the resource admission control function will sign the bandwidth in the user when the session resource is successfully established and the session resource is released. The remaining unused bandwidth is used as the current available bandwidth resource of the user, and is sent to the P-CSCF through the 14 interface;

If the decision processing module is set in the NDUB server, the P-CSCF needs to continue to pass the SDP (Session Description Protocol) media attribute description in the SIP message to the NDUB server based on the above process.

In the embodiment of the method of the present invention, before the user-initiated call does not reach the user terminal, the user-side information may be subscribed to the network-side entity by subscribing to the user status message, and the network-side entity determines the corresponding user status. When a change occurs, a response message of the corresponding subscriber status is returned, and the status of the subscriber is notified of the change. For example, the message of the corresponding subscriber status can be used to determine the moment when the user is in the idle state of the user after determining that the user is in the busy state of the user, so as to implement the corresponding service in time.

The message of subscribing to the user status may be that the service control unit or other network element that needs the user state processing session is sent when the user status is unknown, or the service control unit or other network element is known. After the user status, the user status subscription message is sent to further obtain the user status change information.

The message of subscribing to the user status may be implemented by a session request message carrying a subscription user status event, or a resource request message carrying a resource change notification indication, or may be implemented by using a separate SIP subscription message. When the decision processing module receives the message of the subscribed user status, when the decision processing module obtains the updated bandwidth resource information currently available to the user from the operation processing module, it determines whether the user status changes, if the user determined by the network side When the status is updated, the return can be expressed The response message of the user status determined by the network. Of course, even if the decision processing module does not receive the message of the subscribed user status, it can actively send the updated network determined user status.

Embodiments of the present invention will be separately described below by three specific embodiments. It should be noted that the following descriptions of the processes and descriptions are merely illustrative of the key technologies of the embodiments of the present invention, and do not represent a complete call and service control process, nor do they exhaust all possible branch processes.

Embodiment 1

When the call arrives at the P-CSCF, the P-CSCF requests the resource admission control function to determine whether the currently available resources of the user are sufficient. The corresponding processing process is as shown in FIG. 3, which specifically includes:

Step 31: The called S-CSCF receives an incoming SIP INVITE session request message.

Step 32: The S-CSCF routes the SIP INVITE message to the service control unit.

Step 33: The service control unit returns a SIP INVITE message to the S-CSCF.

On the service control unit, it is necessary to determine whether the network determines the user is busy as the service trigger condition according to the service that the user subscribes to. For example, if the user subscribes to the CFB (busy call forwarding) service, the network needs to use the network to determine the user busy. In the SIP INVITE message sent to the S-CSCF, the corresponding user network is required to determine the user busy indication information, which is used to indicate that the network needs to be immediately identified by the user, that is, the user is busy to process, which can be extended. A SIP header field or parameter is indicated by, for example, indicating the service class by the purpose parameter in the Call-Info header field:

Call-Info : ■··.; purpose=CFB

Or directly indicate that the network needs to determine the user is busy (ndub)

Call-Info : ···.; purpose=ndub

Of course, the service control unit may also not include the above-mentioned indication that the network is determined to be busy by the user in the SIP INVITE message sent by the S-CSCF.

Step 34: The S-CSCF accepts the SIP INVITE message sent from the service control unit and routes it to the called P-CSCF. Step 35: The P-CSCF receives the incoming SIP INVITE message, and performs corresponding processing according to the information carried in the message. The step is specifically: when the SIP INVITE message includes an indication that the network determines that the user is busy, the 14 interface is Immediately initiate a resource request to the resource admission control function; when the SIP INVITE message does not include the indication, the P-CSCF may also unconditionally initiate a resource request to the resource admission control function through the 14 interface;

When the 14 interface uses the Diameter protocol, the resource request message may use an authentication application request command AA (Auth-Application) - Request command, and the command code of the command is 265.

Step 36: The resource admission control function receives the resource request, and comprehensively determines whether the current available bandwidth resource of the user is sufficient to support the establishment of the current session, that is, whether the current available bandwidth resource of the user is greater than the minimum bandwidth required to establish the current session, and Returning a request response to the P-CSCF through the 14 interface, the response containing an indication of whether there is sufficient bandwidth resources;

When the 14 interface adopts the Diameter protocol, the request response message uses an authentication application response command AA (Auth-Application) -Answer command; the command is a response of the authentication application request command, and the command code is 265; For:

First, the resource admission control function should be based on the current remaining bandwidth of the network and the remaining unused bandwidth in the subscriber's subscription bandwidth. And other necessary user service quality subscription data, etc., to obtain bandwidth resource information currently available to the user; second, the resource admission control function determines whether the bandwidth currently available to the user is less than the minimum bandwidth required for the user to establish a session, and if less, Indicates that there are not enough resources in the return response; otherwise indicates that there are enough resources.

In the process described in this step, the minimum bandwidth may be preset in the resource admission control function by using the data configuration manner; or may be preset as the subscription data in the user service quality subscription database, and the resource admission control function is adopted. 15 interface obtained; may also be the minimum bandwidth requirement carried by the P-CSCF to the resource request initiated by the resource admission control function.

Moreover, when the resource admission control function calculates the remaining unused bandwidth in the user subscription bandwidth, the maximum bandwidth of the user subscription is obtained from the user service quality subscription database through the 15 interface, and the cumulative calculation of the user's current established session is performed. The occupied bandwidth, the two are subtracted to obtain the remaining unused bandwidth in the user's subscription bandwidth; wherein, when the 15 interface is used by Diaraeterl, the resource admission control function passes the user data request command on the 15 interface (User - Data-Request command) initiates the request. The user service quality subscription database returns the subscription data through the User-Data-Answer command. The command codes of the two commands are 306.

Step 37: The P-CSCF receives the request response, indicating that there is not enough resources in the response, and the P-CSCF returns the 486 Busy Here busy response code to the S-CSCF.

Step 38: The S-CSCF continues to pass the 486 Busy Here response code to the service control unit; the service control unit will 486

The Busy Here response code triggers related business processing as a result of "network determines user busy", such as CFB service processing.

In the process of the foregoing embodiment, the P-CSCF may return a busy message if the user currently has insufficient resources when the call arrives, otherwise, the call is sent to the user terminal, and the processing flow is more suitable for the CFB service. Because the CFB service will forward to the new destination after the call is busy, the corresponding call process can be realized. For the CW and CCBS services, in addition to playing the network to determine the user is busy (that is, the network determines that the user is at The user is in a busy state to trigger the service. It is also necessary to perform subsequent related service processing when the network judges that the user is idle (that is, the network determines that the user is in the idle state of the user). For example, when there are sufficient resources, it is necessary to make the busy call. Pass to continue subsequent call processing. In this case, the process flow shown in FIG. 4 can be used, which is specifically as follows: Step 41: The S-CSCF to which the called party belongs receives a SIP INVITE session request message.

Step 42: The S-CSCF routes the SIP INVITE message to the service control unit.

Step 43: The service control unit returns a SIP INVITE message to the S-CSCF.

The service control unit judges whether the network decides the user is busy as the service trigger condition according to the service signed by the user. For example, if the user subscribes to the CW service, the CCBS service, etc., the network needs to determine the user busy, and then the S-CSCF is sent to the S-CSCF. The sent SIP INVITE message carries the network subscription user status event packet through the subscription header field, and the BPS-CSCF sends a message for subscribing the user status. For example, the event package may be named ndub event package, then:

Subscription : ndub

Of course, the service control unit may also not include the above-mentioned subscription header field in its SIP INVITE message sent to the S-CSCF.

Step 44: The S-CSCF accepts the SIP INVITE message sent from the service control unit and routes it to the P-CSCF to which the called party belongs. Step 45: The P-CSCF receives the incoming SIP INVITE message, and according to the ndub subscription event packet included therein, immediately initiates a resource request to the resource admission control function through the 14 interface, and the request needs to include the resource change notification indication, so as to facilitate timely Know the network side Sufficient resources to continue the subsequent call processing;

If the SIP event message is not included in the SIP INVITE message, the P-CSCF may also unconditionally initiate a resource request to the resource admission control function through the M interface, and the resource change notification indication is included in the request.

Step 46: The resource admission control function receives the resource request, comprehensively determines whether the current available bandwidth resource of the user is sufficient to support the establishment of the current call session, and returns a request response to the P-CSCF through the 14 interface, where the response includes insufficient resources. The resource admission control function starts monitoring the implementation of the currently available resources of the user according to the resource change notification indication included in the request message, to determine whether the establishment of the session is sufficient, and when the user currently has sufficient resources available. The corresponding information is notified to the service control unit through the entity in the network for corresponding service processing.

Step 47: The P-CSCF receives an indication that there is not enough resources, and sends a SIP NOTIFY message to the S-CSCF, where the message indicates that the user is busy.

If the SIP INVITE message received by the P-CSCF does not include the subscription event packet, then the P-CSCF may send a SIP PUBLISH advertisement message to the S-CSCF, and the message may also indicate that the user is busy.

Step 48: The S-CSCF delivers the SIP NOTIFY or SIP PUBLISH message to the service control unit.

Step 49: The service control unit parses the SIP NOTIFY or SIP PUBLISH message to obtain the busy state of the user, and triggers related service processing, such as service, CCBS service, and the like;

The service control unit returns a 200 OK response code to the SIP NOTIFY or SIP PUBLISH message to the S-CSCF.

Step 410: The S-CSCF passes the 200 0K response code to the P-CSCF

Step 411: The resource admission control function finds that the current available resource of the user can support the establishment of the session, and then notifies the P-CSCF; for example, a call that the user has previously established is released, so that the remaining subscribers in the bandwidth are not subscribed. When the used bandwidth becomes large, the resource admission control function notifies the P-CSCF through the 14 interface, and the user currently has sufficient resources available. When the M interface adopts the Diameter protocol, the notification message may specifically use re-authentication. Requesting the command Re- Auth- Request co and, the command code of the command is 258;

At this time, the resource admission control function may also pre-authorize the user to obtain resources, that is, resource reservation, and of course, may not be reserved, and is reserved in the establishment process of the session thereafter.

Step 412: After receiving the indication that there are sufficient resources, the P-CSCF notifies the S-CSCF, specifically by sending a SIP NOTIFY or SIP PUBLISH message to the S-CSCF, indicating that the user is in an idle state, so that the S-CSCF learns that the user is idle. Information.

Step 413: The S-CSCF continues to deliver the SIP NOTIFY or SIP PUBLISH message to the service control unit, so that the service control unit knows that the current user is in the user idle state.

Step 414: The service control unit parses the SIP NOTIFY or SIP PUBLISH message to obtain information that the user is in the idle state of the user, and triggers subsequent processing of the related service, such as subsequent processing for the CW service, the CCBS service, and the like, such as continuing the incoming call. Send to the user so that the call can be successfully established;

At the same time, the service control unit also returns a 200 OK response code to the SIP NOTIFY or SIP PUBLISH message to the S-CSCF. Step 415: The S-CSCF continues to pass the 200 0K response code sent from the service control unit to the P-CSCF.

So far, in this embodiment, it can be ensured that the user status is recognized by the network side before the initiated call arrives at the called user terminal, thereby facilitating the corresponding service according to the user status. ' As can be seen from the above description, the process shown in FIG. 4 differs from the process shown in FIG. 3 in that: In FIG. 4, a subscription user status event package can be carried in a SIP INVITE message through a subscription header field. To allow the service control unit user to be idle, the P-CSCF sends a SIP NOTIFY message when the user available resources become sufficient.

In fact, instead of carrying the subscribed user status event packet in the SIP INVITE message, instead of receiving the 486 Busy Here response code, the service control unit sends a SIP SUBSCRIBE subscription message to the P-CSCF, as shown in FIG. The Subscriber User Status Event Package is carried by the Event header field. Thus, when the user's currently available resources become sufficient, the P-CSCF will send a SIP NOTIFY message to inform the service control unit that the user is idle.

In the processing flow shown in FIG. 3 and FIG. 4 above, after the call arrives at the P-CSCF, the P-CSCF initiates a request to the resource admission control function to obtain information about whether the user currently has sufficient resources, that is, implements the network. The function of determining user busy is implemented by the resource admission control function.

First, the operation processing module set in the resource admission control function calculates the currently available resources of the user; afterwards, the decision processing module set in the resource admission control function determines whether the current available resources of the user is sufficient to support the current session. Establish and handle accordingly. At this time, the operation processing module and the decision processing module are both set in the resource admission control function, and the interface between the two is an internal interface of the resource admission control function.

In the above embodiment, it can be seen that the resource admission control function implements the function of "the network determines the user is busy", and does not directly indicate the user's busy and idle state, but only provides an indication of whether the user has sufficient bandwidth resources to "implicitly" "The way to determine user busy, that is, "not enough bandwidth resources" indicates that the user is busy, "an indication of sufficient bandwidth resources" indicates that the user is idle.

In addition, it should be noted that, in the processing flow shown in FIG. 3 and FIG. 4, the user's current available resources are based on the current remaining bandwidth of the network and the remaining unused bandwidth in the user subscription bandwidth, but actually The current remaining bandwidth of the network is generally always sufficient. Therefore, in the embodiment of the present invention, only the unused bandwidth in the user subscription bandwidth can be used to determine the busy state of the user state, so as to simplify the processing flow; The actual needs may also determine the currently available resource information of the user according to the remaining unused bandwidth in the user's subscription bandwidth and the current remaining bandwidth of the network.

In addition, it should be noted that the processing according to the user state change shown in FIG. 4 may also have other implementation manners. As described above, the resource admission control function determines that the user can use the data in a predictable time. The bandwidth resource will satisfy the requirement of establishing a current session request of the user, and may also return a resource request response message indicating that the resource is sufficient to the P-CSCF, indicating that the bandwidth resource is sufficient, so that the P-CSCF will deliver the session request message, that is, The INVITE message is sent to the called party so that the signaling process of the session can be established, and the session is established when the user's available bandwidth resources become ready to meet the user's current session request within a predictable time.

Embodiment 2

In the second embodiment, the corresponding arithmetic processing module and the decision processing module are specifically set in the P-CSCF and the NDUB server to implement the corresponding "network determining user busy" function.

In the first embodiment, to calculate the remaining unused bandwidth in the user subscription bandwidth, the user must first obtain the maximum bandwidth of the user subscription from the user service quality: 3⁄4 the subscription database, as can be seen from the architecture diagram provided in FIG. - CSCF and NDUB servers can obtain user subscription data from the user service quality subscription database through the 16 and 17 interfaces respectively. Therefore, both the P-CSCF and the NDUB server can set corresponding operation processing modules to realize "network determines user busy". Computing function to further realize "network decision The user is busy "function. Among them, when the 16 and 17 interfaces adopt the Diameter protocol, both the P-CSCF and the NDUB server can use the aforementioned user data request command (User-Data-Request cosa and) to initiate the request, and the quality of service by the user. The subscription database returns the subscription data through the user data response command (User-Data- Answer coraraand) to ensure that the two entities can obtain the corresponding subscription data, that is, the maximum bandwidth of the user subscription.

In the following, the main implementation process of the second embodiment, that is, the specific processing flow of the "network determining user busy" function on the P-CSCF and the NDUB server will be separately described.

(1) Using P-CSCF to implement the "Network determines user busy" function

When P-CSCF is used as the "network determines user busy" operation function, that is, when the arithmetic processing module is set on the P-CSCF, the P-CSCF needs to accumulate the bandwidth calculated by the user to dynamically establish the session, and sign the contract with the user. The bandwidth compares the remaining unused bandwidth in the user's subscription bandwidth.

In this way, when the corresponding decision processing module is further set on the P-CSCF to implement the corresponding "network decision user busy" decision function, the remaining unused bandwidth in the user subscription bandwidth and the current session establishment may be required. The minimum bandwidth is compared to determine whether the user is busy, that is, the user is identified. The minimum bandwidth required for the current session establishment may be preset in the user service quality subscription database, and the P-CSCF may be obtained through the 16 interface, or may be indirectly obtained by the resource admission control function through the 14 interface; or The corresponding minimum bandwidth information may be determined according to a session establishment minimum bandwidth requirement corresponding to the media codec type carried in the call session received by the P-CSCF.

Therefore, in comparison with the two processing flows of the first embodiment, the P-CSCF receives the SIP INVITE message from the S-CSCF, and can implement the "network determines user busy" function without having to initiate a request to the resource admission control function. After determining that the user is in the user busy state, the P-CSCF will return a 486 Busy Here response code to the CSCF or carry the user busy indication through the SIP NOTIFY/SIP PUBLISH message; otherwise, if the user is in the user idle state, the P-CSCF A SIP INVITE message needs to be sent to the user terminal or an indication that the user is idle is carried by the SIP NOTIFY/SIP PUBLISH message. Similarly, if the P-CSCF receives the SIP SUBSCRIBE message from the service control unit, it can also send a SIP NOTIFY message to the service control unit when the user is idle.

In addition to the subscription data such as the user subscription bandwidth, the P-CSCF can also obtain the subscription data indirectly through the resource access control function through the 14 interface.

(2) Using the NDUB server to implement the "Network determines user busy" function

When the NDUB server is used to implement the "network-determining user busy" function, the corresponding processing flow is as shown in FIG. 5, and specifically includes: Step 51: The S-CSCF to which the user belongs receives the SIP session message that the user calls or calls in, for example, receives A SIP INVITE message sent to the user.

Step 52: The S-CSCF routes the S IP session message to the NDUB server.

Step 53: The NDUB server receives the SIP session message, and determines whether the user bandwidth subscription data exists. If not, the message is the first outgoing or incoming SIP session message after the user successfully registers with the IMS, and then passes the 17 The interface initiates a User-Data-Request command to the user service quality subscription database. If the user bandwidth subscription data already exists, the request is no longer requested, and the process proceeds directly to step 55.

Step 54: The user service quality subscription database returns a user data response command (User-Data-Diagnosis command) through the 17 interface, and the user subscribes to the maximum subscription bandwidth and other subscription data. After receiving the command, the NDUB server records the user subscription bandwidth, and the like. Signing data.

Step 55: The NDUB server returns the above SIP session message to the S-CSCF.

Step 56: The S-CSCF receives a 200 OK response code for the SIP session message.

Step 57: The S-CSCF passes the 200 OK response code to the NDUB server.

That is, after step 55 is performed, and the S-CSCF receives the 200 OK response code for the SIP session message, the step is performed. Step 58: The NDUB server calculates the occupied bandwidth of the currently established session according to the codec type of the media that establishes the session, and compares it with the user subscription bandwidth, thereby obtaining the remaining unused bandwidth in the user subscription bandwidth. That is, it is determined that the user can currently use the resource, and the above 200 OK response code is returned to the S CSCF.

Step 59: After that, each time the SIP session is established, the user passes through the NDUB server. After the session is established, the remaining unused bandwidth in the user subscription bandwidth is calculated. For the specific processing, refer to step 51 to step 58 above.

After performing the above steps 51 to 58 , when the calling party initiates the call, as shown in FIG. 5, the following processing will be performed: Step 510: The S-CSCF receives an incoming incoming SIP INVITE session request message.

Step 511: The S-CSCF routes the SIP INVITE message to the service control unit.

Step 512: The service control unit returns a SIP INVITE message to the S-CSCF.

Step 513: This step is the same as the previous step 52. The S-CSCF still sends a SIP INVITE message to the NDUB server. Step 514: The NDUB server receives the SIP INVITE message, and compares whether the remaining unused bandwidth in the current user subscription bandwidth is sufficient to support the establishment of the current session, specifically, the remaining unused bandwidth in the current user subscription bandwidth and the current The minimum bandwidth comparison required to establish a session is required to determine whether the user is busy, thereby identifying the user status;

The minimum bandwidth required for the current session establishment may be preset in the user service quality subscription database, and the NDUB server obtains the information in the SIP INVITE message received by the NDUB server according to the above-mentioned step 54 through the 17 interface; The minimum bandwidth requirement for the session establishment corresponding to the codec type determines the corresponding minimum bandwidth.

If the result of the judgment is that the user is in the user busy state, the NDUB server returns a busy response code of 486 Busy Here to the S-CSCF. Step 515: The S-CSCF continues to deliver the received 486 Busy Here busy response code to the service control unit.

Step 516: The service control unit receives the 486 Busy Here busy response code, and triggers related service processing, such as CFB service, service, CCBS service, and the like;

If the service process needs to know the change information of the user status, such as the CT service and the CCBS service, the service control unit subscribes to the user status, and sends a SIP SUBSCRIBE subscription message, where the Event header field in the message carries the user status subscription event. Package, such as the new extended ndub event package:

Event: ndub

Step 517: The S-CSCF delivers the SIP SUBSCRIBE message to the NDUB server.

Step 518: The NDUB server returns a 200 OK response code for the SIP SUBSCRIBE message.

Step 519: The S-CSCF passes the 200 OK response code to the service control unit.

Step 520: If the remaining unused bandwidth in the user subscription bandwidth changes, such as a certain call that has been established, or the user's subscription bandwidth becomes larger, the remaining unused bandwidth in the user subscription bandwidth becomes larger. The NDUB server sends a SIP NOTIFY notification message, and the message carries an indication that the user is idle. Step 521: The S-CSCF delivers the SIP NOTIFY message to the service control unit.

Step 522: The service control unit parses the SIP NOTIFY message to learn the user control, triggers subsequent processing of the related service, such as subsequent processing of the CW service, the CCBS service, and the like, such as sending the incoming call to the user to enable the call to be established;

The service control unit returns a 200 OK response code to the SIP NOTIFY message to the S-CSCF.

Step 523: The S-CSCF continues to pass the received 200 OK response code to the NDUB server.

In the above flowchart, the session first passes through the service control unit and then reaches the NDUB server. The NDUB server can also be used to reach the service control unit. The session message sent by the NDUB server can carry the user status information.

In the above flowchart, the NDUB server triggers a request for the subscription data such as the user subscription bandwidth according to the first SIP session message registered by the user in the IMS. In fact, the user may also request the subscription data such as the subscription bandwidth when the user registers. As shown in FIG. 6, the following steps are specifically included:

Step 61: The S-CSCF receives the SIP REGISTER registration message from the user.

Step 62: The S-CSCF sends a SIP REGISTER message to the NDUB server.

Step 63: The NDUB server receives the user registration message, and sends a user data request command (User-Data-Request command) to the user service quality subscription database, where the command carries the user identification information.

Step 64: The user service quality subscription database returns a user data response command (User-Data-Ask command) through the 17 interface, and the command carries the user identifier and the maximum subscription bandwidth of the user, etc.; after receiving the command, the NDUB server records User contracted bandwidth and other contract data.

Step 65: The NDUB server returns a 200 OK response code to the SIP REGISTER logout message to the S-CSCF. .

Step 66: After the user changes the subscription data in the user service quality subscription database, the user service quality subscription database actively sends a Push-Notification-Request command, and the command carries the subscription data such as the user subscription bandwidth. The command code for this command is 309.

Step 67: The NDUB server updates the subscription data such as the user subscription bandwidth, and the remaining unused bandwidth in the subscription bandwidth, and returns a push notification notification command (Push-Notification- Answer co瞧and), which is a push notification request command. In response to the command, the command code is also 309.

Steps 66 and 67 in the above processing flow can also be applied to the processing flow shown in Fig. 5.

In addition, it should be pointed out that in the embodiment in which the NDUB server implements the "network determines user busy" function, the NDUB server directly obtains the user subscription data through the extended 17 interface. In the actual networking, if the 17 interface does not exist, The user subscription data may also be obtained indirectly, for example, using the GUP (Generic User Profile) architecture in the prior art, which is an architecture for implementing distributed data sharing, and the NDUB server initiates data to the GUP server (GUP Server). The request, the GUP server locates the request to the user service quality subscription database according to the request information, so that the NDUB server indirectly obtains the user subscription data.

Embodiment 3

In this embodiment, the arithmetic processing module for realizing the computing function of "network determining user busy" and the decision processing module for realizing the decision function of "network determining user busy" may also be separated, that is, respectively set to different On the network entity, the corresponding "network determines user busy" function is realized by setting information interaction between two modules on different entities.

That is to say, in the two embodiments described above, the "network determines user busy" operation function and decision function are set in The interaction between the computing function and the decision function can be regarded as an interaction message of the internal interface of the network element on the same network element entity (ie, the resource admission control function, any entity in the P-CSCF/NDUB server).

In the actual application process, the computing function and the decision function can also be implemented on different entities respectively. For example, the resource admission control function is used to implement the operation function of "network determines user busy", and P- The CSCF/NDUB server implements the decision function of "network determines user busy", and separates the computing function and decision function of "network determines user busy".

In the third embodiment, the operation processing module is set on the resource admission control function entity, and the decision processing module is set on the P-CSCF/NDUB server as an example, and the operation function and the decision function separation of the "network determines user busy" are separated. The specific implementation process of the setup is described, and the corresponding specific implementation process is as follows -

(1) First, as described in the first embodiment, the resource admission control function, as a computing function of "network determining user busy", needs to obtain the currently available resources of the user, including the remaining remaining bandwidth of the network and the remaining bandwidth of the user subscription bandwidth. Information such as the bandwidth used, since the current remaining bandwidth of the network is always changing, and generally it is always sufficient as described above, the resource admission control function is passed when the resource establishment is successful and released for each successfully established session. The 14 interface carries the unused unused bandwidth of the user's subscription bandwidth as the current available bandwidth resource of the user to the P-CSCF, and if the decision function of the "network determines the user is busy" is the NDUB server, the P-CSCF needs to The bandwidth information is carried in the SIP message and transmitted to the NDUB server, and can be carried in the SDP description information in the IP message.

(2) Secondly, the P-CSCF/NDUB server is always in each session signaling path of the user. When each newly initiated SIP INVITE message passes through the P-CSCF/NDUB server, the P-CSCF/NDUB server can According to the known bandwidth resources currently available to the user, it is judged whether the current session can be established. If it cannot be supported, the 486 Busy Here response code is returned, and the SIP INVITE message is delivered, and the service control unit can also be based on the service. The process needs to subscribe to the user status to the P-CSCF/NDUB server.

The 14 interfaces need to use the remaining unused bandwidth in the user-subscribed bandwidth of the new extension. When the 14 interface adopts the Diameter protocol, it can be transmitted in the authentication application response command AA-Audit command (Auth-Application- Answer). You can add two AVPs (Attribute-value pair) to the command: Unused- Bandwidth- DL AVP indicates the remaining unused bandwidth in the user's subscription bandwidth. Unused-Bandi dth-UL AVP indicates The unused upstream bandwidth remaining in the subscriber's subscription bandwidth. Since the values of the uplink bandwidth and the downlink bandwidth are often the same, it is also possible to extend only one Unused-Bandwidth AVP to represent the remaining unused bandwidth in the user subscription bandwidth. In addition, considering that the user subscription bandwidth can distinguish different media types, Therefore, the new AVP is also targeted at different media types.

The extension of the SDP description information in the IP address may carry the remaining unused bandwidth in the user subscription bandwidth, by adding two attributes UBU (Unused-Bandwidth-UL, unused uplink bandwidth) in the media attribute line. And UBD (Unused-Bandwidth- DL, unused downstream bandwidth) as follows:

a=UBU: 384

Indicates that the remaining bandwidth used by the user's subscription bandwidth is 384K. Similarly, the values of the upstream bandwidth and the downstream bandwidth are often the same, so it is also possible to extend only one attribute UB (Unused Bandwidth) to represent the bandwidth remaining in the user's subscription bandwidth.

In the above embodiments, the "network determines user busy" function is implemented by the resource admission control function, the P-CSCF, the NDUB server, or the division of labor. In general, the resource admission control function and the P- The CSCF is located in the network access (access) domain, The NDUB server is located in the network home (registration) domain. Therefore, it can be seen that the "network determines user busy" function is completed by the network access domain network element and the network home domain network element independently or by division of labor. By accessing the domain network element through the network to implement this function, it is easier to perceive the current available resources of the network (the current remaining bandwidth of the network). This function is implemented by the network home domain network element, which can more easily handle different terminals of the same user through different visits. A scenario in which a domain accesses a network.

In summary, the embodiments provided by the present invention solve the problem that the current IMS-based packet domain cannot determine the busyness of the user based on the currently available resources of the user when the call has not arrived at the user terminal, so that the CW, CCBS, CFB and other services can be reliably executed normally.

In addition, it should be noted that the foregoing embodiment of the method and apparatus provided by the present invention solves the problem that the network identifies the user busy. In the specific service embodiment, the application scenario that the network identifies the called user is busy, actually It can be seen that the device based on FIG. 1 and FIG. 2 is also applicable to the application scenario in which the network recognizes the busyness of the calling user. Examples are as follows: the calling user initiates a call, sends a SIP INVITE message, and the P-CSCF or NDUB server receives To the INVITE message, through the foregoing method embodiment, the resource admission control function, the P-CSCF, and the NDUB server are independently or partially divided to implement the "network determines user busy" function to determine whether to allow the calling user to initiate. call. Obviously, the application scenario in which the network identifies the calling user is busy can be easily implemented by using the foregoing three embodiments. The specific implementation process is not described in detail herein.

In addition, it should be noted that, in some cases, even if the network determines that the user is busy, based on the call attributes, such as priority, the user's outgoing or incoming call is still allowed. For example, the user initiates an emergency call or initiates an emergency call to the user. At this time, even if the user can utilize insufficient bandwidth resources, such as insufficient remaining unused bandwidth in the user subscription bandwidth, the emergency call is a call with a high priority. The network will still allow the user's call.

In summary, the embodiment provided by the present invention can effectively solve the problem that the current S-based packet domain cannot determine that the user is busy based on the currently available resources of the user when the call has not arrived at the user terminal. That is, the implementation of the embodiments provided by the present invention ensures that before the call initiated by the calling party reaches the called user terminal, the user state of the called user terminal can be determined based on the available bandwidth resources of the called user, thereby making the IMS in the IMS. Services such as CT, CCBS, and CFB in the packet network can be implemented based on the available bandwidth resource information of the user.

In summary, the embodiments provided by the present invention enable flexible selection of two implementation modes for determining user busy in an IMS packet network, thereby improving the flexibility of network operation management.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Rights request

An implementation method for identifying a user state in a network, the method comprising:

2. The method according to claim 1, wherein the step of determining that the user needs to identify the user state comprises:

Proxy-Call Session Control Function P-CSCF entity or network determines user busy After the NDUB server receives the session message, or after the resource admission control function entity receives the resource request message, it determines that the user status needs to be identified.

The method according to claim 2, wherein the step of determining the user status corresponding to the user specifically includes:

Proxy-call session control function P-CSCF entity or network determines user busy NDUB server or resource admission control function entity obtains the available bandwidth resource information;

The user status is determined according to the available bandwidth resource information and the minimum bandwidth resource for establishing a session.

The method according to claim 1, wherein if the network side obtains a message for acquiring a subscriber status of the user status change information, the method further includes: the network side entity determining that the user status changes After that, the subscriber of the subscriber status is returned with a response message of the subscriber status, and the message carries the changed user status information.

The method according to claim 1, wherein after the resource admission control function entity determines that the user status of the corresponding user changes, the method further includes:

When the resource admission control function entity receives the resource request message triggered by the message of the subscription user status, the resource admission control function entity replies to the subscriber with a response message of the subscription user status; or

The resource admission control function entity unconditionally sends the updated user status information.

The method according to claim 2 or 5, wherein the resource request message comprises: a resource request message sent by the P-CSCF to the resource admission control function entity.

The method according to claim 1, 2, 3, 4 or 5, wherein the processing of determining the available bandwidth resource information of the user specifically includes: in the resource admission control function entity, according to The current remaining bandwidth of the network and the remaining unused bandwidth information in the user subscription bandwidth determine the current available bandwidth resource of the user; or, the resource admission control function entity or the P-CSCF or the independently set network determines the user busy NDUB server The remaining unused bandwidth in the maximum bandwidth subscribed by the user is determined as the current available bandwidth resource of the user, according to the maximum bandwidth subscribed by the user and the bandwidth occupied by the user terminal currently established.

And the step of determining the user status corresponding to the user specifically includes:

The resource admission control function entity or the P-CSCF or the NDUB server determines whether the current available bandwidth resource of the user is smaller than the minimum bandwidth resource required for the current session establishment. If it is less than, the user is determined to be in the user busy state. Otherwise, the user is determined to be in the user idle state. State, or, if less than and within the expected time, the available bandwidth resource will become greater than or equal to the current session establishment required The minimum bandwidth resource determines that the user is in the user idle state.

The method according to claim 7, wherein the maximum bandwidth subscribed by the user is preset and stored in a user service quality subscription database, and the resource admission control function entity or P-CSCF or NDUB The server obtains the maximum bandwidth information of the user subscription directly or indirectly from the user service quality subscription database.

The method according to claim 7, wherein the method further comprises: determining a process of establishing a minimum bandwidth resource required for the current session, specifically:

Pre-setting the minimum bandwidth resource in the user service quality subscription database, and the P-CSCF or NDUB server directly or indirectly obtains the minimum bandwidth resource information from the user service quality subscription database, and the resource admission control function Obtaining, by the entity, the minimum bandwidth resource information directly from the user service quality subscription database; or

The P-CSCF or the NDUB server determines the minimum bandwidth resource information according to information carried in the received session request message; or

The resource admission control function entity determines the minimum bandwidth resource information according to the information carried in the received resource request message; or

The minimum bandwidth resource information is preset and stored in the resource admission control function entity, and the resource admission control function entity locally determines the minimum bandwidth resource information.

The method according to claim 7, wherein after determining the user status corresponding to the user, the method further includes:

On the P-CSCF or NDUB server, when it is determined that the user is in the user busy state, the IjP-CSCF or NDUB server sends a SIP response code or a SIP notification message or a SIP announcement message indicating that the user is busy; when it is determined that the user is in the user idle state And transmitting the SIP session request message, so that the session continues to be established, or sending a SIP notification message or a SIP release message indicating that the user is idle; or, on the resource admission control function entity, when determining that the user is in the user busy state, The resource admission control function entity returns a resource request response message indicating that the resource is insufficient to the P-CSCF, and sends a SIP response code or a SIP notification message or a SIP release message indicating that the user is busy by the P-CSCF; when determining that the user is in the idle state of the user And returning a resource request response message indicating that the resource is sufficient to the P-CSCF, and transmitting the SIP session request message by the P-CSCF, allowing the session to continue to be established, or sending an IP notification message or a SIP release message indicating that the user is idle.

The method according to claim 7, wherein after the resource admission control function entity determines that the current available bandwidth resource of the user changes, the method further includes:

Determining the currently available bandwidth resource information of the changed user to determine the user status; or

Transmitting the determined currently available bandwidth resource information of the changed user to the P-CSCF, and determining, by the P-CSCF, the user status; or

The determined changed user's currently available bandwidth resource information is sent to the P-CSCF, and is further sent by the P-CSCF to the NDUB server, and the NDUB server determines the user status.

An apparatus for identifying a user state in a network, wherein the device is disposed on a network side, and is configured to identify a user state before the call process message arrives at the peer user, and the device specifically includes:

An operation processing module: configured to calculate and determine bandwidth resource information currently available to the user; The decision processing module is configured to determine user status information of the current user according to the currently available bandwidth resource information determined by the operation processing module.

The device according to claim 12, wherein the operation processing module specifically includes:

User subscription bandwidth acquisition module: used to obtain the maximum bandwidth information of the user subscription, and is provided to the calculation module; the occupied bandwidth determination module: used for statistically determining the bandwidth information occupied by the user to establish the session, and providing the bandwidth information to the calculation module;

Calculating the wedge: calculating a difference between the maximum bandwidth information subscribed by the user and the occupied bandwidth information, and determining available bandwidth resource information of the current user according to the difference.

The device according to claim 13, wherein the calculating module specifically uses the difference value as the available bandwidth resource information of the current user, or the calculating module includes:

a difference calculation module: configured to calculate a difference between the maximum bandwidth information of the user subscription and the occupied bandwidth information as remaining unused bandwidth information in the user subscription bandwidth;

15. Apparatus according to claim 12 wherein:

When the operation processing module is set in the resource admission control function entity, the operation processing module obtains the maximum bandwidth information subscribed by the user locally, or the operation processing module communicates with the user service quality subscription database to obtain the maximum bandwidth of the user subscription signed therein. Information

Or,

When the operation processing module is set in the P-CSCF or the NDUB server, the operation processing module communicates with the user service quality contract database to obtain the maximum bandwidth information of the user subscription signed therein, or obtains the saved information locally in the P-CSCF or NDUB server. The maximum bandwidth information that the user has signed up.

16. Apparatus according to claim 15 wherein:

The operation processing module set in the resource admission control function entity obtains the maximum bandwidth information of the user subscription from the quality of service subscription database through the 15 interface; or

The operation processing module set in the P-CSCF obtains the maximum bandwidth information subscribed by the user from the quality of service subscription database through the 16 interface, or obtains the most signed user registration from the resource admission control function entity local or the service quality subscription database through the 14 interface. Bandwidth information; or,

The operation processing module set in the NDUB server obtains the maximum bandwidth information of the user subscription from the quality of service subscription database through the 17 interface, or obtains the maximum bandwidth information subscribed by the user from the quality of service subscription database indirectly through the intermediate server.

The apparatus according to any one of claims 12 to 16, wherein the decision processing module includes: a minimum bandwidth acquisition module: configured to acquire a minimum bandwidth resource required to establish a current session, and provide The judging module: comparing the available bandwidth resources of the current user provided by the operation processing module with the minimum bandwidth resource, and determining that the corresponding user is a user busy state or a user idle state.

18. Apparatus according to claim 17 wherein: The decision processing module obtains the minimum bandwidth resource information saved locally from the network element where the module is located; or the decision processing module communicates with the user service quality subscription database to obtain the minimum bandwidth resource information stored therein; or, the decision processing The module parses the process message of the current session, and obtains the minimum bandwidth resource information.

19. Apparatus according to claim 17 wherein:

The decision processing module set in the resource admission control function entity obtains the minimum bandwidth resource information from the service quality subscription database through the 15 interface, or obtains the minimum bandwidth resource information of the saved user subscription from the local; or

The decision processing module set in the P-CSCF obtains the minimum bandwidth resource information from the quality of service subscription database through the 16 interface, or acquires the minimum bandwidth resource from the resource admission control function entity local or the quality of service subscription database through the 14 interface. Information, or, obtaining the minimum bandwidth resource information of the saved user subscription from the local; or

The decision processing module set in the NDUB server obtains the minimum bandwidth resource information from the service quality subscription database through the 17 interface, or obtains the minimum bandwidth resource information from the service quality subscription database indirectly through the intermediate server, or obtains the local bandwidth resource information. The minimum bandwidth resource information that the saved user subscribes to.

20. Apparatus according to claim 17, characterized in that:

The decision processing module that is disposed in the resource admission control function entity further includes a resource request message parsing module, configured to parse the resource request message sent by the P-CSCF, and obtain the minimum bandwidth resource information from the parsing result; or

The decision processing module set in the P-CSCF or the NDUB server further includes a session request message parsing module, configured to parse the received session request message, and obtain the minimum bandwidth resource information from the parsing result.

The device according to claim 17, wherein the device further comprises a user status notification module, configured to notify a service control unit that needs a user status processing service or a network element that needs a user status processing session. User status, and,

If the user is in a busy state, the user status notification module sends a message indicating that the user is busy, or a resource request response message indicating that the resource is insufficient;

Or,

If the user is in a user idle state, the user status notification module sends a message indicating that the user is idle, or transmits the SIP session request message, or a resource request response message indicating that the resource is sufficient;

Or,

If the user is in the user busy state, and it is determined that the user state may be in an idle state within a predictable time, the user state notification module sends a message indicating that the user is idle, or transmits the SIP message, or indicates A resource request response message with sufficient resources. ·

22. The apparatus according to claim 21, wherein the manner in which the user status notification module notifies the user status includes at least one of the following manners:

Notifying the user status according to a service control unit that needs to perform service processing based on the user status or other request for a network element that needs to perform session processing based on the user status;

The user status notification is performed according to the service control unit that needs to perform service processing based on the user status or other network element that needs to perform session processing based on the user status, and then, after the user status changes, continue to the service control unit. Or other network element notifies the currently updated user status; Directly allow or deny user service requests or session requests.

23. An implementation method for conducting a service based on a user state, where the method includes:

After determining that the user state-based service is initiated in the network, the network side identifies the user state of the user before the service reaches the peer user, where the user state includes determining according to the available bandwidth resource information of the user;

The method according to claim 23, wherein the user status based service comprises: a busy communication session completion service, a busy call forwarding service or a communication waiting service.

The method according to claim 23 or 24, wherein the process of the network side identifying the user state of the user comprises: if the current available bandwidth resource of the user is smaller than a minimum bandwidth required for the current session establishment The resource determines that the user is in the user busy state, otherwise, determines that the user is in the user idle state, or if less than and within the expected time, the available bandwidth resource will become greater than or equal to the minimum bandwidth resource required for the current session establishment. And determining that the user is in a user idle state, where the current available bandwidth resource of the user is unused unused bandwidth information in the user subscription bandwidth.

The method according to claim 23 or 24, wherein after the user state-based service is initiated in the determining network, the message carrying the network identifier for identifying the user busy flag or the service class identifier is sent, where the network side The flag processing identifies the user status function of the user, or subscribes to the notification of the user status change, and the network side sends a notification of the user status change according to the subscription when the user status changes.

The method according to claim 26, wherein the manner of subscribing to the notification of the change of the user status comprises: performing a subscription of the user status change by using a header field or an extended event in the message.

28. A device for conducting a service based on a user state, comprising: a service request message receiving module, a user status receiving module, and a service logic processing module, wherein:

The device for performing a service based on the user status according to claim 28, further comprising a service request response message sending module, configured to send a response message of the service request according to the service processing result of the service logic processing module.

The device for performing a service based on a user state according to claim 28 or 29, further comprising a user status requesting module, configured to send a message carrying the request indication to request a user status.