CN101291519B - Method, system and apparatus for providing mode selection to multi-mode terminal - Google Patents

Abstract

The invention discloses a method, a system and a device for providing access mode selection for a multi-mode terminal, so that after a routing decision-making entity selects an access mode according to a certain strategy, it can instruct the routing execution entity to perform call connection in the selected access mode . The method of the present invention includes: when the terminal establishes a registration connection, inform the network side of the current access mode type and the resource name bound to the current access mode type; The global routable user agent uniform resource identifier GRUU allocated by the terminal is associated with the two; and when connecting to the called party, the routing decision-making entity on the network side selects the access mode, and uses the selected access mode type corresponding The GRUU instructs the routing execution entity to perform call connection.

Description

Method, system and device for providing access mode selection for multi-mode terminals

technical field

The present invention relates to the communication field, in particular to a method, system and device for providing access mode selection for a multi-mode terminal. the

Background technique

IMS is the IP multimedia subsystem in the WCDMA network defined by the 3GPP R5/R6 standard. It is the target network for the 3G mobile network to realize packet voice and packet data and provide unified multimedia services and applications. The IMS uses the IP packet domain as the bearer channel for its control messages and media transmission, and uses the SIP protocol as the call control message. In IMS, IMS user subscription data is centrally managed in HSS, the service is provided by the application server AS, and the session control is completed by the S-CSCF. The two are completely separated in the network structure, and the service is triggered by the S-CSCF to the AS for processing. Multiple ASs can work together. The user accesses the IMS through the proxy node P-CSCF at the current location, and the session and service control are completed by the home domain service node where the user is registered. Therefore, the user can always get the same service at different access points, realizing service management and session control. The separation of the three and the bearer access, as well as the provision of services independent of access and location. the

Since multiple access mode terminals can be supported, a user's multi-mode terminal can be simultaneously registered to the network through multiple access domains, and the simultaneously registered user identities can be the same or have some kind of association (identities that are not associated with single-mode The terminal handles the same). The multi-mode terminals mentioned here include but are not limited to WCDMA multi-mode terminals, CDMA2000 multi-mode terminals or mobile multi-mode terminals of other standards. Users can initiate or receive calls in any registered domain, and even initiate or receive calls in multiple domains at the same time. the

When a multi-mode terminal is called, which access network the network chooses to connect the call is also a topic being studied by 3GPP. The current solution proposed by 3GPP is to add an entity called DSF (Domain Selection Function) in the IMS network. When it receives a call that needs to be connected to a multi-mode terminal, it will make an access domain selection decision based on various factors such as operator policies, user preferences, and terminal registration status, and connect the call to the selected terminal according to the decision result. into the domain. When the DSF chooses to connect the call in the CS domain, the DSF returns the CS domain access number to the S-CSCF to indicate that the call is connected to the CS domain; when the DSF chooses to connect the call in the IMS domain, the DSF returns the user’s IMPU to the S-CSCF to indicate The call is continued in the IMS domain. the

To sum up, the inventor discovered during the invention process that there are multiple access modes in a certain access domain, but the existing technology cannot solve the problem of how the network selects the access mode and indicates the call when the multi-mode terminal is called. Continuation question. That is, after the routing decision-making entity selects an access mode according to a certain strategy, it cannot correspondingly instruct the routing execution entity to perform call connection in the selected access mode. the

Contents of the invention

Embodiments of the present invention provide a method, system, and device for providing access mode selection for multi-mode terminals, so that after a routing decision-making entity selects an access mode according to a certain policy, it can instruct the routing execution entity to use the selected access mode Make a call connection. the

Embodiments of the present invention provide another method and device for providing access mode selection for multi-mode terminals, so that when the network side decides to split an incoming session into media streams according to different media components, different media streams can be passed through different The access mode is carried over to the multimode terminal. the

The method in the embodiment of the present invention includes: when the terminal establishes a registration connection, inform the network side of the current access mode type and the resource name bound to the current access mode type; The resource name is the global routable user agent uniform resource identifier GRUU allocated by the terminal, and the two are associated; and when connecting to the called party, the routing decision-making entity on the network side selects the access mode, and The GRUU corresponding to the type instructs the routing execution entity to perform call connection. the

The routing decision-making entity in the embodiment of the present invention includes: an associating unit for associating the access mode type notified by the multi-mode terminal with the globally routable user agent uniform resource identifier GRUU allocated by the routing execution entity; the access mode The selection unit is used to select the access mode; the instruction unit is used to obtain the GRUU corresponding to the access mode type selected by the access mode selection unit from the association unit, and use the GRUU to instruct the routing execution entity to perform call connection. the

The multi-mode terminal in the embodiment of the present invention includes: an identification unit, used to identify the access mode type when the multi-mode terminal establishes a registration connection, and also includes: an adding unit, used to identify the multi-mode terminal identified by the identification unit The current access mode type of the terminal and the resource name bound to the current access mode type are added to the registration message sent to the network side;

The current access mode type is used by the network side to associate with the globally routable user agent uniform resource identifier GRUU allocated to the multimode terminal according to the resource name;

The routing decision-making entity on the network side selects an access mode when connecting a call to the called party, and instructs the routing execution entity on the network side to connect the call with the GRUU corresponding to the selected access mode type. the

The system of the embodiment of the present invention includes: a multi-mode terminal, used to inform the network side of the current access mode type and the resource name bound to the current access mode type when establishing a registration connection; Act as a registration server when establishing a registration connection, and assign a global routable user agent uniform resource identifier GRUU to the multi-mode terminal according to the resource name notified by the multi-mode terminal, and use it for call connection; the routing decision-making entity is used to The access mode type notified by the multi-mode terminal is associated with the GRUU allocated to the multi-mode terminal by the routing execution entity according to the resource name; and the access mode is selected, and the GRUU corresponding to the selected access mode type is indicated The routing execution entity performs call connection. the

Another method for providing access mode selection for a multi-mode terminal according to an embodiment of the present invention includes the following steps: when the terminal establishes a registration connection, inform the network side of the identification information of the current access network type; , the routing decision-making entity on the network side splits the call session message into media streams according to the media components, selects an access mode corresponding to each media stream, and instructs the routing execution entity to connect The media stream. the

Another routing decision-making entity in the embodiment of the present invention includes: a saving unit, used to save the identification information of the current access network type notified by the terminal when establishing a registration connection; a splitting unit, used to divide the call session message into media components split into media streams, and send the split results; the access mode selection unit is used to select the access mode corresponding to each media stream according to the split results sent by the split unit; the indication unit is used to select the access mode from the storage unit respectively obtain the identification information corresponding to the access mode type selected by the access mode selection unit for each media stream, and use the identification information to instruct the routing execution entity to continue the media stream. the

In the embodiment of the present invention, when the terminal establishes a registration connection, it notifies the network side of the current access mode type and the resource name bound to the current access mode type, and the network side notifies the terminal of the access mode type and the resource name according to the resource name The global routable user agent uniform resource identifier GRUU assigned to the terminal is associated with the two; when the call is connected to the called party, the routing decision-making entity on the network side selects the access mode and corresponds to the selected access mode type The GRUU instructs the routing execution entity to proceed with the call connection. the

Therefore, through the binding of the resource name and the current access mode type, the GRUU is allocated according to the resource name, and the current access mode type is associated with the GRUU. This series of operations finally realizes that after the routing decision-making entity selects the access mode, The routing execution entity may be instructed to proceed with the call connection in the selected access mode. the

The embodiments of the present invention can use the most suitable access network to connect media streams, thereby improving network transmission efficiency and improving user service experience. the

Description of drawings

Fig. 1 is the method step flowchart of the embodiment of the present invention;

Fig. 2 is a schematic structural diagram of a routing decision-making entity in an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a multimode terminal according to an embodiment of the present invention;

Fig. 4 is the signaling flowchart of embodiment one of the present invention;

Fig. 5 is the signaling flowchart of the second embodiment of the present invention;

FIG. 6 is a schematic structural diagram of another routing decision-making entity in an embodiment of the present invention;

FIG. 7 is a signaling flowchart of Embodiment 3 of the present invention. the

Detailed ways

In order for the routing decision-making entity to select an access mode according to a certain policy, it can instruct the routing execution entity to perform call connection in the selected access mode. the

An embodiment of the present invention provides a method for providing access mode selection for a multi-mode terminal, as shown in Figure 1, including the following steps:

S1. When establishing a registration connection, the terminal notifies the network side of the current access mode type and the resource name bound to the current access mode type. the

In the prior art, when multiple terminals share the IMPU when making a call, in order to prevent the SIPREQUEST from being forked to multiple UEs, the IETF and 3GPP introduce the concept of GRUU. The GRUU is composed of the IMPU and the resource name Instance_id of the UE. Among them, Instance_id is the id used to identify the UE Instance (that is, a terminal has only one Instance_id), so that GRUU can identify a UE. Even if the IMPU is shared by multiple UEs, using GRUU as the REQUEST URI can still ensure that the SIP message is sent to the only specified UE. the

With the emergence of multi-mode terminals supporting multiple access modes, different access mode types of the same multi-mode terminal are regarded as different application instances of the multi-mode terminal. There are multiple access network modules in a multi-mode terminal, so in the embodiment of the present invention, different access modes of a multi-mode terminal have corresponding Instance_ids, that is, the instance_id is bound to the access mode type. the

The above-mentioned current access mode type can be carried in the P-Access-Network-Info header field of the registration message (P-Access-Network-Info is a header field in the SIP protocol, which can be used to carry access network information and user location information.) to inform the network side. the

S2. The network side allocates a GRUU to the terminal according to the resource name. the

The GRUU is composed of the IMS public user identity IMPU and the instance_id notified by the terminal. the

S3. The network side associates the access mode type notified by the terminal with the allocated GRUU. the

S4. When connecting to the called party, the routing decision-making entity on the network side selects an access mode. the

The relevant strategy for selecting the access mode by the routing decision-making entity includes at least one of the following: operator policy, caller preference information, access network capability, access network status, media category, components in the media category, and each component in the media category Attribute information of ingredients. the

Before the routing decision-making entity selects the access mode, it may also include: the routing decision-making entity judges whether there are at least two media components in the call session message, and if so, the routing decision-making entity further selects whether to split the call session message into media components Media streams (further, you can choose whether to split the split media streams into uplink media streams and downlink media streams), if so, select the access mode corresponding to each media stream, and use the selected access mode to correspond The GRUU instructs the routing execution entity to continue the media stream; otherwise, directly selects the access mode of the call session message, and uses the GRUU corresponding to the selected access mode to instruct the routing execution entity to continue the call. Refer to Example 2. the

S5. The routing decision-making entity on the network side uses the GRUU corresponding to the selected access mode type to instruct the routing execution entity to connect the call. the

Specifically, the routing decision-making entity carries the GRUU associated with the selected access mode type in the indication message sent to the routing execution entity; the routing execution entity locates the registration connection according to the GRUU carried in the indication message, and based on the registration connection Make a call connection. the

The embodiment of the present invention also provides a routing decision-making entity, as shown in FIG. 2 , which includes: an associating unit, an access mode selecting unit, and an indicating unit; further includes: a determining unit and a splitting unit. the

The associating unit is configured to associate the access mode type notified by the multi-mode terminal with the GRUU allocated by the routing execution entity. the

The determining unit is configured to send a trigger signal when determining that there are at least two media components in the received call session message, and further determining that the call session message is divided into media streams according to the media components. the

The splitting unit is configured to split the call session message into media streams according to media components when receiving the trigger signal from the determining unit; and inform the access mode selection unit to select an access mode corresponding to each media stream. the

The access mode selection unit is used for selecting an access mode. the

The instructing unit is configured to acquire the GRUU corresponding to the access mode type selected by the access mode selection unit from the association unit, and use the GRUU to instruct the routing execution entity to perform call connection. the

An embodiment of the present invention also provides a multi-mode terminal, as shown in FIG. 3 , which includes: an identification unit and an adding unit. the

The identification unit is used to identify the access mode type when the multi-mode terminal establishes a registration connection. the

The adding unit is configured to add the current access mode type of the multi-mode terminal identified by the identification unit and the resource name bound with the current access mode type to the registration message sent to the network side. the

The embodiment of the present invention also provides a system for providing access mode selection for a multi-mode terminal, including: a multi-mode terminal, a routing execution entity and a routing decision-making entity. the

The multi-mode terminal is used for notifying the network side of the current access mode type and the resource name bound to the current access mode type when establishing a registration connection. the

The routing execution entity is configured to serve as a registration server when the terminal establishes a registration connection, and allocate a GRUU to the multi-mode terminal according to the resource name notified by the multi-mode terminal, and to perform call connection. The routing execution entity is, for example, S-CSCF. the

The routing decision-making entity is used to associate the access mode type notified by the multi-mode terminal with the GRUU allocated to the multi-mode terminal by the routing execution entity according to the resource name; and select an access mode, and use the selected access mode The GRUU corresponding to the entry mode type instructs the routing execution entity to perform call connection. The routing decision-making entity is specifically a network element that stores relevant policies for selecting an access mode, such as an AS, an HSS, and the like. the

Describe in detail below through 2 examples. the

Embodiment 1. When the terminal establishes a registration connection, it notifies the network side of the current access mode type and the instance_id bound to the current access mode type; the network side associates the access mode type notified by the terminal with the allocated GRUU; the application server It is determined that there is a media component in the call session message, and there is no need to split the media component; when connecting to the called party, the routing decision-making entity selects an access mode for the call session message; finally, the routing decision-making entity uses the selected access mode The GRUU corresponding to the entry mode type instructs the routing execution entity to perform call connection. See shown in Figure 4, including the following steps:

1: The multi-mode terminal accesses the IMS network from WLAN, initiates a registration request REGISTER, and adds the +sip.instance parameter in the contact header field of the registration request. The content of this parameter is the multi-mode terminal bound to the WLAN access mode instance id_1. At the same time, the current access mode type information, that is, WLAN, is added to the P-Access-Network-Info header field of the registration request. the

2: The S-CSCF generates GRUU_1 according to the IMPU and the value of instance id_1 in the contact header field of the registration request, and carries the user registration event and the GRUU_1 allocated by the S-CSCF to the terminal UE in the contact header field of the registration event notification message Notify the application server Server. the

At the same time, the S-CSCF associates the contact_1 of the registration request with the GRUU_1 allocated for the terminal UE; and after receiving the registration event notification message, the application server Server learns from the registration event notification message that the multimode terminal accesses the IMS network from the WLAN, and connects the WLAN to the IMS network. The entry mode is associated with GRUU_1. the

3: The multi-mode terminal accesses the IMS network from WCDMA, initiates another registration request, and adds the +sip.instance parameter to the contact header field of the registration request. The instance id_2 of the mod terminal. At the same time, the current access mode type information, that is, WCDMA, is added to the P-Access-Network-Info header field of the registration request. the

[Note]: After receiving this registration message, S-CSCF can perceive this is a multi-registration event of the same terminal according to different reg-ids (reg-id is also carried in the contact header field in the registration request message, For details, refer to the description in the prior art), then the original connection of contact_1 (that is, the contact established in steps 1 and 2) is not canceled. the

Alternatively, the S-CSCF can also judge based on different instance ids that this is multiple registrations initiated from different access modes of the same terminal, and there is no need to use reg-id to perceive it. the

4: The S-CSCF generates GRUU_2 according to the IMPU and the value of instance id_2 in the contact header field of the registration request, and carries the user registration event and the GRUU_2 allocated by the S-CSCF to the terminal UE in the contact header field of the registration event notification message Notify the application server Server. the

At the same time, the S-CSCF associates the contact_2 of the registration request with the GRUU_2 allocated for the terminal UE; and after receiving the registration event notification message, the application server Server learns from the registration event notification message that the multimode terminal accesses the IMS network from WCDMA, and connects the WCDMA connection to the IMS network. Entry mode is associated with GRUU_2. the

5: When an incoming call needs to be connected to the terminal equipment of the called user, the call message INVITE is first sent to the S-CSCF. the

6: S-CSCF is triggered by iFC (initial Filter Criteria), and triggers the INVITE to the application server Server. the

7: The application server determines (selects) the terminal device and its access mode (assumed to be WLAN) that need to be connected to the call according to relevant policies, and then fills in the Request-URI header of the INVITE according to the association between the WLAN access mode and GRUU_1 The field content is GRUU_1, and the INVITE containing this header field is sent back to the S-CSCF.

8: S-CSCF locates (selects) the registration connection of GRUU1 according to the selection of the application server Server and the relationship between contact_1 and GRUU_1 established in steps 1 and 2, that is, the S-CSCF fills in the Request-URI as established in steps 1 and 2 The content of the contact (that is, contact_1) will send the INVITE. In this way, the call can be accurately terminated to the specific access mode of the specific multi-mode terminal equipment. the

9: The multi-mode terminal answers the call in WLAN mode and returns the final call response. the

Embodiment 2. When the terminal establishes a registration connection, it notifies the network side of the current access mode type and the instance_id bound to the current access mode type; the network side associates the access mode type notified by the terminal with the allocated GRUU; the application server Determine that there are multiple media components in the call session message, and decide to split the session message according to different media components according to a certain strategy; then, when connecting to the called party, the routing decision-making entity separately divides each media component The flow selects the access mode; finally, the GRUU corresponding to the selected access mode is used to instruct the routing execution entity to continue the media flow. Shown in Fig. 5, comprise the following steps:

1: The multi-mode terminal accesses the IMS network from WLAN, initiates a registration request REGISTER, and adds the +sip.instance parameter in the contact header field of the registration request. The content of this parameter is the multi-mode terminal bound to the WLAN access mode instance id_1. At the same time, the current access mode type information, that is, WLAN, is added to the P-Access-Network-Info header field of the registration request. the

2: The S-CSCF generates GRUU_1 according to the value of the IMPU and the instance id_1 in the contact header field of the registration request, and carries the user registration event and the GRUU_1 allocated by the S-CSCF to the terminal UE in the contact header field of the registration event notification message Notify the application server Server. the

At the same time, the S-CSCF associates the contact_1 of the registration request with the GRUU_1 allocated to the UE; and after receiving the registration event notification message, the application server Server learns from the registration event notification message that the multimode terminal accesses the IMS network from the WLAN, and connects the WLAN to the IMS network. The entry mode is associated with GRUU_1. the

3: The multi-mode terminal accesses the IMS network from WCDMA, initiates another registration request, and adds the +sip.instance parameter in the contact header field of the registration request. The instance id_2 of the mod terminal. At the same time, the current access mode type information, that is, WCDMA, is added to the P-Access-Network-Info header field of the registration request.

[Note]: After receiving this registration message, S-CSCF can perceive this is a multi-registration event of the same terminal according to different reg-ids (reg-id is also carried in the contact header field in the registration request message, For details, refer to the description in the prior art), then the original connection of contact_1 (that is, the contact established in steps 1 and 2) is not canceled. the

Alternatively, the S-CSCF can also judge based on different instance ids that this is a multi-registration initiated from different access modes of the same terminal, and there is no need to use the reg-id to perceive it. the

4: The S-CSCF generates GRUU_2 according to the IMPU and the value of instance id_2 in the contact header field of the registration request, and carries the user registration event and the GRUU_2 allocated by the S-CSCF to the terminal UE in the contact header field of the registration event notification message Notify the application server Server. the

At the same time, the S-CSCF associates the contact_2 of the registration request with the GRUU_2 allocated for the terminal UE; and after receiving the registration event notification message, the application server Server learns from the registration event notification message that the multimode terminal accesses the IMS network from WCDMA, and connects the WCDMA connection to the IMS network. Entry mode is associated with GRUU_2. the

5: When an incoming call needs to be connected to the terminal equipment of the called user, the call message INVITE is first sent to the S-CSCF. the

6: S-CSCF is triggered by iFC (initial Filter Criteria), and triggers the INVITE to the application server Server. the

7: The application server determines that there are multiple media components in the call session message, and decides to split the session message according to different media components according to a certain strategy. The application server then selects the terminal device and access mode for each split media stream according to the policy. In this embodiment, two media streams, video and audio, are split. The video stream is decided to be connected to the multi-mode terminal through the WLAN mode, and the audio stream is decided to be connected to the multi-mode terminal through the WCDMA mode. the

[Note]: The splitting of the media stream can also include further splitting into two media streams of uplink and downlink. the

8a: Since the video stream is decided to be connected to the multi-mode terminal through the WLAN mode, fill in the Request-URI header field content of the INVITE as GRUU_1 according to the association between the WLAN access mode and GRUU_1, and return the INVITE containing this header field to S -CSCF. Go to step 9a.

8b: At the same time (simultaneously with step 8a), since the audio stream is decided to be connected to the multi-mode terminal through the WCDMA mode, fill in the Request-URI header field content of the INVITE as GRUU_2 according to the association between the WCDMA access mode and GRUU_2, and will contain The INVITE in this header field is returned to the S-CSCF. Go to step 9b. the

9a: S-CSCF locates (selects) the registration connection of GRUU_1 according to the selection of the application server Server and the relationship between contact_1 and GRUU_1 established in steps 1 and 2, that is, the S-CSCF fills in the Request-URI as established in steps 1 and 2 The content of the contact (that is, contact_1) will send the INVITE. In this way, the video media stream can be accurately terminated to the WLAN access mode of the specific multi-mode terminal device. Go to step 10a. the

9b: At the same time (simultaneously with step 9a), the S-CSCF locates (selects) the registration connection of GRUU_2 according to the selection of the application server Server and the relationship between contact_2 and GRUU_2 established in steps 3 and 4, that is, the S-CSCF sends the Request-URI Fill in the content of the contact established for steps 3 and 4 (that is, contact_2), and send the INVITE. In this way, the audio media stream can be accurately terminated to the WCDMA access mode of the specific multi-mode terminal equipment. Go to step 10b. the

10a: The multi-mode terminal receives the video media stream in WLAN mode, and returns a final call response. the

10b: The multimode terminal receives the audio media stream in WCDMA mode, and returns the final call response. the

In Embodiments 1 and 2 of the present invention, when establishing a registration connection, the terminal informs the network side of the current access mode type and the resource name instance_id bound to the current access mode type, and the network side notifies the terminal of the access mode type It is associated with the globally routable user agent uniform resource identifier GRUU assigned to the terminal according to the instance_id; then when connecting to the called party, the routing decision-making entity on the network side selects the access mode, and uses the selected access mode The GRUU corresponding to the entry mode type instructs the routing execution entity to perform call connection. Therefore, through the binding of instance_id and the current access mode type, assigning GRUU according to the instance_id, and associating the current access mode type with the GRUU, this series of operations finally realizes that the routing decision-making entity selects the access mode according to a certain strategy Afterwards, the routing execution entity may be instructed to proceed with the call connection in the selected access mode. the

Before the routing decision-making entity selects the access mode, it may also include: whether there are at least two media components in the routing decision-making entity judging the call session message, and if so, further routing decision-making entity selection whether to split the call session message into media components Media stream, if so, then select the access mode corresponding to each media stream, and instruct the routing execution entity to continue the media stream with the GRUU corresponding to the selected access mode; otherwise, directly select the access mode of the call session message , and use the GRUU corresponding to the selected access mode to instruct the routing execution entity to connect the call. In this way, media streams can be connected with the most suitable access network, thereby improving network transmission efficiency and improving user service experience. the

Furthermore, when the routing decision-making entity determines that the call session message needs to be split into media streams according to media components, the split media streams may also be split into uplink media streams and downlink media streams. In this way, various access networks can be better utilized to enhance the user's service experience. the

The embodiment of the present invention also provides another method for providing access mode selection for a multi-mode terminal, including the following steps: when the terminal establishes a registration connection, inform the network side of the identification information of the current access network type; When the call is connected, the routing decision-making entity on the network side splits the call session message into media streams according to the media components (further, each media component can be divided into uplink media stream and downlink media stream), and selects the connection link corresponding to each media stream. access mode, and respectively use the identification information corresponding to the selected access mode to instruct the routing execution entity to continue the media stream. the

Wherein, the identification information of the access network type is the current access mode type and the resource name instance_id bound to the current access mode type, or is the content carried by the newly added parameter in the feature tag (for example, the name is accesstype, which takes Values can be "wlan", "wcdma", etc.). the

Further, the embodiments of the present invention may directly split the call session message without judging the number of media components contained in the call session message; or, when it is determined that there are at least two media components in the call session message, then split the call session message according to the media components into a media stream. the

The embodiment of the present invention also provides another routing decision-making entity, as shown in FIG. 6 , which includes a storage unit, a splitting unit, an access mode selection unit, and an indication unit; it may further include a determination unit. the

The storage unit is configured to store the identification information of the current access network type notified by the terminal when establishing the registration connection. the

A determining unit is configured to send a trigger signal to the splitting unit when determining that there are at least two media components in the call session message. the

The splitting unit is configured to split the call session message into media streams according to media components, and send the splitting result. The splitting unit can wait for the trigger signal sent by the judging unit, and then perform the splitting operation, or directly perform the splitting operation. the

The access mode selection unit is configured to select an access mode corresponding to each media stream according to the splitting result sent by the splitting unit. the

The instructing unit is configured to respectively obtain the identification information corresponding to the access mode type selected by the access mode selection unit for each media stream from the storage unit, and use the identification information to instruct the routing execution entity to continue the media stream. the

The following is a specific description through two examples. the

Embodiment 3: The application server determines that there are multiple media components in the call session message, and decides to split the session message according to different media components according to a certain policy. the

In this embodiment, a feature tag is added to identify the access network type. Assume that the name of the newly added feature tag is accesstype, and the value can be "wlan", "wcdma", etc., to identify various access modes. the

See shown in Figure 7, including the following steps:

1. The multi-mode terminal accesses the IMS network from the WLAN, initiates a registration request REGISTER, and the request message carries the contact_1 address, and the contact header field is followed by the accesstype parameter that identifies the type of access network. The parameter is assigned to wlan, indicating access from the WLAN network . After the request message is forwarded by the corresponding entity, it reaches the S-CSCF (the intermediate transfer process has nothing to do with the present invention and will not be described in detail). the

2. After the user registration process is completed, the S-CSCF notifies the application server of the user registration event and the content of the contact header field. The content of the contact header field includes the accesstype parameter that identifies the type of access network, and its value is wlan. (The Server has subscribed to the user's registration event to the S-CSCF before, so the S-CSCF can notify the Server here, and the subscription process has nothing to do with the present invention, and will not be described in detail)

3. The multi-mode terminal then accesses the IMS network from WCDMA, and initiates another registration request. The request message carries the contact_2 address and the accesstype parameter assigned as wcdma, indicating access from the wcdma network. the

[Note]: After receiving this registration message, S-CSCF perceives that this is a multi-registration event of the same terminal according to different reg-ids (reg-id is also carried in the contact header field in the registration request message), Then the original connection of contact_1 will not be canceled. the

In addition, as a newly added method, the S-CSCF can also judge that this is multiple registrations initiated from different access modes of the same terminal according to different access types. the

4. The S-CSCF notifies the application server of the new registration event of the user and the content of the contact header field. The content of the contact header field includes the accesstype parameter that identifies the type of access network, and its value is wcdma. the

5. When a call needs to be connected to the user, the call signaling INVITE is first sent to the S-CSCF. the

6. The S-CSCF is triggered by iFC (initial Filter Criteria), and triggers the call signaling to the application server Server. the

7: The application server determines that there are multiple media components in the call session message, and decides to split the session message according to different media components according to a certain strategy. The application server then selects the terminal device and access mode for each split media stream according to the policy. In this embodiment, two media streams, video and audio, are split. The video stream is decided to be connected to the multi-mode terminal through the WLAN mode, and the audio stream is decided to be connected to the multi-mode terminal through the WCDMA mode. the

[Note]: The splitting of media streams also includes further splitting into two media streams, uplink and downlink. the

8a: Since the video stream is decided to be connected to the multi-mode terminal through the WLAN mode, fill in the content of the Accept-Contact header field as accesstype=wlan, and return the INVITE request containing this header field to the S-CSCF. the

8b: At the same time, since the audio stream is decided to be connected to the multi-mode terminal through WCDMA mode, fill in the content of the Accept-Contact header field as accesstype=wcdma, and return the INVITE request containing this header field to the S-CSCF. the

9a: The S-CSCF locates (selects) the registration connection with accesstype=wlan according to the selection of the application server, that is, the S-CSCF fills in the Request-URI as the content of contact_1, and sends the INVITE request. In this way, the video media stream can be accurately terminated to the WLAN access mode of the specific multi-mode terminal device. the

9b: The S-CSCF locates (selects) the registration connection with accesstype=wcdma according to the selection of the application server, that is, the S-CSCF fills in the Request-URI as the content of contact_2, and sends the INVITE request. In this way, the audio media stream can be accurately terminated to the WCDMA access mode of the specific multi-mode terminal equipment. the

10a: The multi-mode terminal receives the video media stream in WLAN mode, and returns a final call response. the

10b: The multimode terminal receives the audio media stream in WCDMA mode, and returns the final call response. the

Embodiment 4. When the terminal establishes a registration connection, it notifies the network side of the current access mode type and the instance_id bound to the current access mode type; the network side associates the access mode type notified by the terminal with the allocated GRUU; the application server Determine that there are multiple media components in the call session message, and decide to split the session message according to different media components according to a certain strategy; then, when connecting to the called party, the routing decision-making entity separately divides each media component The flow selects the access mode; finally, the GRUU corresponding to the selected access mode is used to instruct the routing execution entity to continue the media flow. the

To sum up, in Embodiments 3 and 4 of the present invention, when establishing a registration connection, the terminal informs the network side of the identification information of the current access network type; The session message is split into media streams according to the media components, and corresponding to each media stream, an access mode is selected according to relevant policies, and the identification information corresponding to the selected access mode is used to instruct the routing execution entity to continue the media stream. In this way, media streams can be connected with the most suitable access network, thereby improving network transmission efficiency and improving user service experience. the

Furthermore, when the routing decision-making entity determines that the call session message needs to be split into media streams according to media components, the split media streams may also be split into uplink media streams and downlink media streams. In this way, various access networks can be better utilized to enhance the user's service experience. the

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention belong to the scope of the claims of the present invention and equivalent technologies thereof, the present invention is also intended to include these modifications and variations.

Claims (18)

1. A method for providing access mode selection for a multimode terminal, characterized in that, comprising the following steps: When establishing a registration connection, the terminal notifies the network side of the current access mode type and the resource name bound to the current access mode type; The network side associates the access mode type notified by the terminal with the globally routable user agent uniform resource identifier GRUU allocated to the terminal according to the resource name; and When connecting a call to the called party, the routing decision-making entity on the network side selects an access mode, and uses the GRUU corresponding to the selected access mode type to instruct the routing execution entity to perform call connection. 2. The method according to claim 1, wherein the GRUU is formed by combining the IMS public user identity (IMPU) of the terminal and the resource name notified by the terminal. 3. The method according to claim 1, wherein the routing decision-making entity instructs the routing execution entity to perform call connection with the GRUU corresponding to the selected access mode type, further comprising: The routing decision-making entity carries the GRUU associated with the selected access mode type in the indication message sent to the routing execution entity; and The routing execution entity locates the registered connection according to the GRUU carried in the indication message, and performs call connection. 4. The method according to claim 1, wherein the current access mode type is carried in the P-Access-Network-Info header field of the registration message. 5. The method according to claim 1, characterized in that, the relevant policies for selecting the access mode by the routing decision-making entity include at least one of the following: operator policy, caller preference information, access network capability, access network Status, media category, components in the media category, attribute information of each component in the media category. 6. The method according to any one of claims 1 to 5, further comprising: before the routing decision-making entity selects the access mode: The routing decision-making entity determines that there are at least two media components in the call session message, and the routing decision-making entity further determines that the call session message is divided into media streams according to the media components, then the routing execution entity selects an access mode corresponding to each media stream, and The GRUU corresponding to the selected access mode is used to instruct the routing execution entity to continue the media stream. 7. The method according to claim 6, wherein, when the routing decision-making entity determines that the call session message needs to be split into media streams according to media components, it is further judged whether to split each media stream into Uplink media flow and downlink media flow. 8. A routing decision-making entity, characterized in that, comprising: An associating unit, configured to associate the access mode type notified by the multi-mode terminal with the globally routable user agent uniform resource identifier GRUU assigned by the routing execution entity; an access mode selection unit, configured to select an access mode; The instructing unit is configured to acquire the GRUU corresponding to the access mode type selected by the access mode selection unit from the association unit, and use the GRUU to instruct the routing execution entity to perform call connection. 9. The routing decision-making entity according to claim 8, further comprising: A determining unit, configured to send a trigger signal when determining that there are at least two media components in the received call session message, and further determining that the call session message is divided into media streams according to the media components; The splitting unit is configured to split the call session message into media streams according to media components when receiving the trigger signal from the determining unit; and inform the access mode selection unit to select an access mode corresponding to each media stream. 10. A multi-mode terminal, comprising: an identification unit for identifying the access mode type when the multi-mode terminal establishes a registration connection, characterized in that it also includes: An adding unit, configured to add the current access mode type of the multi-mode terminal identified by the identification unit and the resource name bound to the current access mode type to the registration message sent to the network side; The current access mode type is used by the network side to associate with a globally routable user agent uniform resource identifier GRUU allocated to the multimode terminal according to the resource name; The routing decision-making entity on the network side selects an access mode when connecting a call to the called party, and instructs the routing execution entity on the network side to connect the call with the GRUU corresponding to the selected access mode type. 11. A system for providing access mode selection for a multi-mode terminal, characterized in that it comprises: The multi-mode terminal is used to notify the network side of the current access mode type and the resource name bound to the current access mode type when establishing a registration connection; The routing execution entity is used to act as a registration server when the terminal establishes a registration connection, and allocate a global routable user agent uniform resource identifier GRUU to the multi-mode terminal according to the resource name notified by the multi-mode terminal, and to perform call connection ; The routing decision-making entity is used to associate the access mode type notified by the multi-mode terminal with the GRUU allocated to the multi-mode terminal by the routing execution entity according to the resource name; and select an access mode, and use the selected access mode The GRUU corresponding to the entry mode type instructs the routing execution entity to perform call connection. 12 . The system according to claim 11 , wherein the routing decision-making entity is a network element storing related policies for selecting an access mode, and the routing execution entity is a Serving Call Session Control Function (S-CSCF). 13. A method for providing access mode selection for a multi-mode terminal, comprising the following steps: When establishing a registration connection, the terminal notifies the network side of the identification information of the current access network type; When making a call connection to the called party, the routing decision-making entity on the network side splits the call session message into media streams according to the media components, selects the access mode corresponding to each media stream, and uses the identifier corresponding to the selected access mode The information instructs the routing execution entity to continue the media stream. 14. The method according to claim 13, wherein the identification information of the access network type is the current access mode type and the resource name bound to the current access mode type, or is a newly added parameter in featuretag carry content. 15. The method according to claim 13, characterized in that, splitting each media component in the call session message into an uplink media stream and a downlink media stream. 16. The method according to any one of claims 13 to 15, further comprising: when the routing decision-making entity determines that there are at least two kinds of media components in the call session message, then press the call session message according to the media Components are split into media streams. 17. A routing decision-making entity, comprising: a saving unit, configured to save the identification information of the current access network type notified by the terminal when establishing a registration connection; A splitting unit, configured to split the call session message into media streams according to media components, and send the splitting result; The access mode selection unit is used to select the access mode corresponding to each media stream according to the splitting result sent by the splitting unit; The instructing unit is configured to respectively obtain the identification information corresponding to the access mode type selected by the access mode selection unit for each media stream from the storage unit, and use the identification information to instruct the routing execution entity to continue the media stream. 18. The routing decision-making entity according to claim 17, further comprising: The determining unit is configured to send a trigger signal to the splitting unit when it is determined that there are at least two media components in the call session message.

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