CN1809037A - Method of implementing end-to-end information interaction - Google Patents

Abstract

The invention discloses a method for realizing information interaction between terminals, which is used in the comprehensive circuit switching bearer and IP multimedia subsystem (CSI) service of 3G network, which is required for completing the CSI service between terminals establishing CS calls Information exchange including terminal capabilities, wireless access network capabilities, and user identifiers used by peer users in the IMS domain; where the present invention transmits user-to-user information through user-to-user signaling (UUS) services in the The above-mentioned information exchange is completed between the terminals establishing the CS call; further, the present invention uses the UUS3 service to realize the above-mentioned information exchange in a timely manner and multiple times through user information messages during the entire CS call.

Description

A Realization Method of End-to-End Information Interaction

technical field

The invention relates to the third-generation mobile communication network technology, in particular to a method for realizing end-to-end information interaction in integrated circuit switching bearer and IP multimedia subsystem (CSI) services.

Background technique

With the development of mobile communication technology, people are no longer satisfied with a single voice communication method, but need a new multimedia communication method. This multimedia communication is not only simple video and audio communication, but also includes instant messaging, same-site browsing, collaborative Work, streaming media, etc., especially the integration of new communication methods and traditional voice services. Based on the trend of Internet and telecommunications network integration, various standardization organizations have proposed the concept of next-generation networks. The IP Multimedia Subsystem (IMS) of the all-IP service network architecture introduced by 3GPP on the basis of the packet bearer network aims to , shield user access methods, control the openness of service capabilities, and provide multimedia communication experience. The main functional entities in IMS include Call Control Entity (CSCF) that controls functions such as user registration and session control, Application Server (AS) that provides various business logic control functions, Home Subscriber Server (HSS) that centrally manages user subscription data, and The media gateway control function/IMS media gateway function (MGCF/IM-MGW) used to realize the intercommunication with the circuit switching network, the user accesses the IMS through the current proxy node P-CSCF, and the session and service trigger control and the service with the AS The control interaction is completed by the home domain service node S-CSCF where it is registered; IMS uses the initial session protocol (SIP) as the application layer interaction signaling, and the interface protocols between the terminal and CSCF, between CSCF, and between CSCF and AS are all It is the SIP protocol.

The traditional communication network is divided into a circuit switching (CS) domain and a packet switching (PS) domain, respectively completing circuit switching services (including voice services, circuit data services, fax, etc.) and packet data services. The IMS service consists of a control part and a media content part. The control part refers to the IMS signaling interaction between the IMS terminal and the IMS domain network entity to control the IMS service. The media content part refers to various contents such as images, voice, data, and sound. media stream. Both IMS signaling and media streams are carried by the PS domain. Since CS and PS handle network resources differently (CS is an exclusive resource type, PS is a shared resource type), so for services with high real-time requirements, such as voice services, the service quality of IMS is better than that of CS. (QoS) will decline, may not be able to meet the business needs of operators and users. For this reason, the International Organization for Standardization 3GPP proposed the CSI (Combining CS Bearers with IMS) service that combines CS bearers with IMS. Its content includes two types: CS/CSB and IMS/CSB. Services, that is, CS calls and IMS sessions are completely controlled by corresponding domains, and are associated with terminals on both sides, so as to provide richer services by taking advantage of the comprehensive advantages of CS/IMS; IMS/CSB refers to the use of CS bearer in IMS sessions, that is, The establishment of the CS bearer is controlled by the IMS logic, and is specifically implemented in the CS domain, and is used to solve the quality of service (QoS) problem in the IMS service that requires high real-time performance.

Since the realization of IMS/CSB requires the cooperation of the terminal and the IMS network, it is relatively complicated. In order to implement the above services as soon as possible, 3GPP decided to divide the CSI into two stages. CS calls and IMS sessions are controlled in the CS domain and IMS domain respectively. An IMS session can be added to an established CS call, and a CS call can also be added to an established IMS session. Terminals on both sides can only be connected according to the needs of specific service applications. complete the association between the CS call and the IMS session, as shown in Figure 1.

Since the above-mentioned first-stage CSI services require terminals and networks on both sides to support the air interface connection between CS and PS at the same time, the end-to-end capability needs to be completed before adding another domain session/call to the established call/session Information exchange, the content of the interaction includes the peer user's: terminal capabilities, the capabilities of the currently accessed wireless access network, and the user ID used for call/session establishment in another domain (E.164 number in the CS domain or SIP in the IMS domain) -URL); at the same time, since the CS call and the IMS session are controlled by the CS network and the IMS network respectively in the first phase of the CSI service, in order to ensure that the call/session is established between the same two user terminals, there is a problem of coordination of existing services in the two domains .

User-to-User Signaling (User-to-User Signaling, UUS) is a CS domain supplementary service, which can transparently transmit user-customized information from the network to the peer user according to user requests, depending on the implementation method and transmission timing , divided into the following three categories:

(1) UUS1 can implicitly request the network to provide through the user-to-user information (UUI) in the call setup request message (Setup), or explicitly request the network to provide through the indicator in the call setup request message. All UUI Both are sent in control signaling during call setup;

(2) UUS2 explicitly requests the network to provide it through the indicator in the call establishment request message, and the called terminal confirms in the ringing (Alert) message. After confirmation, the calling parties can transmit the UUI through the User Information (UserInformation) message before the called party answers. ;

(3) UUS3 can explicitly request the network to provide it through the indicator in the call establishment request message or the Facility message, and the peer user confirms in the Connect or Facility message, and both parties can pass User The Information message transmits the UUI multiple times.

The maximum length of the User-user cell in CS signaling is 130 bytes, but some networks only support a maximum UUI of 35 bytes;

Calling line identification presentation (CLIP) and connected line identification presentation (COLP) are CS domain number display supplementary services. Through the CLIP service, the E.164 number of the calling user can be passed through The call setup request (Setup) message is delivered to the last connected called user. Through the COLP service, the E.164 number of the CS call last connected user can be sent back to the calling user through the Connect (Connect) message, so that the calling user The user can know the peer user who is actually connected after the CS domain forwarding and other service effects that may cause the call direction to be transferred.

3GPP TR 23.899 is a technical standard in 3GPP about using CS bearer in IMS services. For CSI phase 1, when the CS call is established first, the end-to-end capability interaction scheme provided and recommended is as follows:

(1) During the call establishment process, the radio access network capability is exchanged through the subaddress cell or UUS1 in the call control signaling;

(2) Before adding an IMS session, interact with the peer terminal capability through the SIP OPTION operation on the IMS;

(3) Obtain the initial session protocol Uniform Resource Locator (SIP-URL) of the opposite end through a phone book or other means.

Considering that the end-to-end interaction capability is relatively lacking in the CS call establishment process, and at the same time, it is necessary to extend the SIP/SDP even if the E.164 number is exchanged under the condition that the IMS session In the early stage of development, CS and IMS adopt a configuration scheme in which E.164 numbers and SIP-URLs can be directly derived from each other to solve the difficulty of user identification interaction.

In the case where the IMS session is established first, the current standard does not consider the requirements and methods for exchanging information in the CS;

In addition, for the problem of service coordination between the CS and IMS network domains in the CSI phase one, in the current version of TR 23.899 and related standard discussions, only the service configuration restriction method for CSI users in the two domains can be considered.

There are following problems in above-mentioned technical scheme:

1. The currently defined terminal capability interaction content includes not only the terminal’s support for CSI capabilities (while maintaining the CS/PS air interface connection, and the ability to associate successively established CS calls and IMS sessions according to service application requirements), but also includes the ability to communicate in IMS sessions. The media type and format exchanged with the message exceeds the interaction capability that UUS1 can carry. Therefore, the scheme of exchanging the capabilities of the peer terminal through the SIP OPTION operation on the IMS is adopted. However, due to the inherent forking characteristics of the IMS domain and other services Influenced by the control, the destination side of the OPTION operation may be different from the destination side of the established CS call and the destination side of the subsequent establishment of the IMS session, resulting in error information obtained during capability interaction, and the expected purpose cannot be achieved.

2. In the current solution, UUS1 is used to interact with wireless access network capabilities. However, from the introduction of UUS services above, it can be seen that UUS1 can only perform information interaction during call establishment, and lacks the ability to exchange information during calls. Causes the following problems:

a. Since user switching may cause changes in the capabilities of the radio access network during the call, it may occur that capability interaction is performed during CS call establishment to confirm that the peer radio access network supports CSI, but when actually preparing to add an IMS session, the The current cell is no longer supported after handover occurs at the end, so that the subsequent IMS session of the CSI service fails, and the expected purpose of capability interaction is still not achieved.

b. On the other hand, the lack of information interaction capability during a call cannot meet the requirement of enabling the CSI service for capability interaction after the CS call is established, which affects the service experience of the user to a certain extent.

c. Finally, even if the establishment of the CS call and IMS session has been successfully completed, the wireless access network may no longer support the ability to maintain the air interface connection of the CS and PS due to handover during the call, resulting in the handover user losing the PS If there is no information exchange capability in the call in the CS domain, the opposite end user cannot be notified of events occurring on the CS connection, which affects the service experience of the user and may cause the IMS/PS network resources to fail to be released in time. Since switching to a cell that does not support maintaining the air interface connection of CS and PS at the same time during the call will directly cause the user to lose the connection at the PS, the event that is completed through the CS during the call is notified to those who previously established the CS call and the first established IMS session In both cases there are application requirements.

3. UUS1 indicating the request may also conflict with the forwarding service commonly used in CS (forwarding if the user decides to be busy after ringing) and forwarding on no answer service, thereby affecting call establishment or user information transmission.

4. Finally, the current solution only considers the service configuration restriction method that will cause great restrictions on the business development of the two domains for the service coordination problem of the CS and IMS network domains, and does not provide a more effective solution. Therefore, , in the case that the CS call is established first, considering the impact of the forwarding service widely used by CS, even if the CS and IMS adopt the configuration scheme in which the E.164 number and SIP-URL can be directly derived from each other based on the prior art proposal, It will not be possible to obtain the SIP-URL of the peer user of the final connection because the identity of the peer user cannot be determined. In this way, the subsequent session is initiated for the SIP-URL of the called user originally dialed by the calling party, which will result in:

a. The subsequently established IMS session cannot reach the peer user who has established the CS call because the IMS service and the CS service have not been coordinated and configured;

b. Since what is exchanged during the establishment of a CS call is actually the peer user information of the final connection of the CS call, the subsequent IMS session initiated for the SIP-URL of the called user originally dialed by the calling party may be caused by the user terminal or its The session establishment failed due to reasons that cannot be supported by the current access network capabilities.

Contents of the invention

The present invention provides a method for implementing end-to-end information interaction to solve the problem in the prior art that wrong information may be obtained due to terminal capability interaction based on option (OPTION) operations. The interaction of capabilities is limited by the number of interactions and the information interaction during the call, and may conflict with the forwarding service, thus affecting the call establishment or the transmission of user information.

The present invention also solves the problem that when the CS call is established first, the SIP-URL of the final connected user of the CS call cannot be accurately obtained due to the impact of the widely used forwarding service of the CS call, resulting in the failure of the session establishment or the failure of the session to reach the opposite end .

In order to solve the above problems, the present invention provides the following technical solutions:

A method for implementing end-to-end information interaction, which is used in a 3G network to complete integrated CS bearer and IP Multimedia Subsystem (IMS) services (hereinafter referred to as CSI services) between terminals establishing a circuit switched (CS) call Information exchange; among them, the user-to-user information (UUI) transmitted in the user-to-user signaling (UUS) service is used to exchange the terminal capabilities required to complete the CSI service between the terminals establishing the CS call.

According to the method above:

The UUI delivered in the UUS service is the UUI delivered in the UUS1, UUS2 or UUS3 service; the UUI delivered in the UUS1 service includes the UUI carried by UUS1 in the CS call control message, and the UUI delivered in the UUS2 and UUS3 services Include the UUI carried in the user information message.

The terminal capability includes the capability of the terminal to support CSI services and the capability of the media type and format supported by the terminal in IMS sessions and messages; the capability of the terminal to support CSI includes maintaining the CS/PS air interface connection at the same time, and The application requires the ability to correlate successively established CS calls and IMS sessions.

In the case of being limited by the capability of the selected UUS service type (such as choosing to use UUS1 or UUS2) or wishing to complete the above interaction with as few user-to-user information interactions as possible, the terminal capabilities required to complete the CSI service are divided into The two parts interact. Among them, UUS is used to complete the terminal's support for the CSI capability. This part includes maintaining the CS/PS air interface connection at the same time, and the ability to associate successively established CS calls and IMS sessions according to service application requirements. The terminal is in the IMS session. The ability to interact with the media type and format supported in the message uses the offer/answer (offer/answer) mechanism of the Session Description Protocol (SDP) during the establishment of the IMS session to complete the interaction. In the case of not being limited by the capabilities of the selected UUS service type (for example, UUS3 is selected), the terminal’s support for CSI capabilities (including maintaining the CS/PS air interface connection at the same time, and associating the established ones according to the service application requirements) capabilities of CS calls and IMS sessions) and the capabilities of media types and formats supported by terminals in IMS sessions and messages are accomplished through multiple user-to-user information interactions.

A method for implementing end-to-end information interaction, which is used in a 3G network to complete the information exchange required for integrated CS bearer and IP Multimedia Subsystem (IMS) services (hereinafter referred to as CSI services) between two terminals establishing a CS call ; Wherein, between the two terminals, use the user-to-user information (UUI) transmitted in the UUS3 service to interact and complete part or all of the information required for the CSI service.

According to the method above:

The CSI service refers to adding an IMS session to an established CS call between two terminals, and the information required by the CSI service includes terminal capability, wireless access network capability, and initial session protocol uniform resource locator (SIP-URL ); or, the CSI service refers to adding a CS call to an established IMS session between two terminals, and the information required by the CSI service is radio access network capability.

The terminal capability includes the terminal's ability to support CSI services and the capability of the terminal to support media types and formats in IMS sessions and messages; the wireless access network capability refers to the ability to maintain CS/PS air interface connections at the same time; The capability of the terminal to support CSI includes maintaining the CS/PS air interface connection at the same time, and associating successively established CS calls and IMS sessions according to service application requirements.

If it is determined that CSI service-related information exchange is required during the CS call establishment process, the call establishment request message is used to request the network to provide UUS3 services; The network provides UUS3 services

For the CSI service that adds an IMS session to the established CS call, some or all of the information required for the CSI service can be exchanged between terminals through the UUI delivered in the UUS3 service when preparing to initiate the subsequent IMS session of the CSI service.

Using the business capabilities of UUS3, the information interaction is completed by transmitting UUI multiple times between terminals, so as to realize information interaction beyond the length of a single interaction information.

If the handover of one of the two parties in the call/conversation leads to a change in the capability of the wireless access network, the handover terminal uses the UUI delivered in the UUS3 service to notify the peer user to perform capability update. After the CS call and IMS session have been established, the peer user receives the capability update notification from the handover user that the cell no longer supports the CSI capability, confirms the notification by using the user information message in the UUS3 service, and initiates the release due to The IMS session suspended due to the terminal losing the PS air interface connection is switched, so as to release unnecessary occupied IMS network and packet (PS) network resources.

A method for implementing end-to-end information interaction, which is used in a 3G network to add a CSI service of an IMS session to an established CS call, and the terminal simultaneously subscribes to the CS domain calling number display (CLIP) and connected number display (CLIP) COLP) business, the method comprises the steps:

The calling terminal and the called terminal establishing the CS call obtain the CS telephone number information of the end user finally connected to the CS call according to the display results of the calling number presentation (CLIP) and connected number presentation (COLP) services respectively;

The calling terminal and the called terminal respectively convert the CS telephone number information into an initial session protocol uniform resource locator (SIP-URL) corresponding to the user;

The calling terminal and the called terminal directly initiate a subsequent IMS session of the CSI service to the opposite terminal according to the obtained SIP-URL.

In the case that the CS call is established first, the present invention can enable end-to-end capability interaction and necessary event notification to be initiated whenever needed, and ensure that it is completed between the two user terminals establishing the CS call, avoiding the need for prior art The problem that terminal capability interaction using option (OPTION) operation may obtain wrong information; through the combination of CLIP and COLP, the subsequent added IMS session can be directly initiated for the opposite end user of the CS call connection, which improves the existing technical solution in both Insufficient consideration in the coordination and control of individual domain services creates conditions for the early implementation of CSI Phase 1 services and the comprehensive use of CS/IMS advantages to provide users with richer services.

Description of drawings

Figure 1 is a schematic diagram of the first phase of CSI business;

FIG. 2 is a flow chart of CSI stage 1 for completing information interaction in Embodiment 1 of the present invention;

FIG. 3 is a flow chart of CSI stage 1 for completing information interaction in Embodiment 2 of the present invention;

Fig. 4 is a processing flowchart when the network capability changes;

Fig. 5 is a flow chart of a subsequent IMS session initiated by a CSI service using calling number display and connected number display.

Detailed ways

Aiming at the shortcomings of the prior art through the SIP OPTION on the IMS to operate the interactive terminal capability, the present invention uses the user-to-user information (UUI) transmitted in the user-to-user signaling (UUS) service to establish a CS call between terminals The information interaction including part or all of the terminal capabilities is completed, thereby solving the problem in the prior art that wrong information may be obtained during terminal capability interaction based on OPTION.

The UUI delivered in the UUS service is the UUI delivered in the UUS1, UUS2 or UUS3 service; the UUI delivered in the UUS1 service includes the UUI carried by UUS1 in the CS call control message, and the UUI delivered in the UUS2 and UUS3 services includes the user The UUI carried in the information message.

In the case of being limited by the capability of the selected UUS service type (such as choosing to use UUS1 or UUS2) or wishing to complete the above interaction with as few user-to-user information interactions as possible, the terminal capabilities required to complete the CSI service are divided into The two parts interact. Among them, UUS is used to complete the interaction of the terminal’s ability to support CSI services. This part includes maintaining the CS/PS air interface connection at the same time, and the ability to associate successively established CS calls and IMS sessions according to service application requirements. The ability of media type and format supported in the IMS session is established in the IMS session using the offer/response (offer/answer) mechanism of the Session Description Protocol (SDP) to complete the interaction.

In the case that it is not limited by the capability of the selected UUS service type (for example, UUS3 is selected) and the above-mentioned interaction is not required to be completed with as few user-to-user information interactions as possible, the terminal's ability to support the CSI service ( Including maintaining the CS/PS air interface connection at the same time, and associating successively established CS calls and IMS sessions according to service application requirements) and the ability of the media type and format supported by the terminal in IMS sessions and messages. User information interaction to complete.

If you decide to enable the CSI service when the CS call is established, you can request the network to provide UUS1, UUS2 or UUS3 service capabilities in the UUS service in the call establishment request message (Setup); The (Facility) message requests the network to provide UUS3 service capabilities.

Because UUS1 and UUS2 may conflict with the forwarding service commonly used in CS calls, and at the same time, neither UUS1 nor UUS2 has the ability to interact and exchange user-to-user information after establishing a CS call. In order to avoid conflicts, improve The reliability and flexibility of capability interaction, therefore, the best way is to use the user-to-user information (UUI) exchange transmitted in the UUS3 service between the two terminals to complete part or all of the information required for the CSI service information. The following mainly uses UUS3 service capability to complete relevant capability interaction as an example for illustration.

When deciding to enable the CSI service and apply for and use UUS3 to complete the relevant capability interaction (including the interaction of the above-mentioned terminal CSI capability support):

(1) If it is decided to enable the CSI service when the CS call is established, the indicator in the call setup request (Setup) message is used to request the network to provide the UUS3 service, and the peer user can pass the user information (User Information) message transmits UUI to perform end-to-end CSI capability interaction including terminal and wireless access network capabilities; UUS3 can use the service capability of exchanging information after the call is established, and can perform the above information interaction before preparing to initiate an IMS session, thereby avoiding negotiation After the cell capacity changes.

(2) If it is decided to enable the CSI service after the CS call is established, request the network to provide the UUS3 service through the Facility message, and send it through the User Information message after the peer user confirms the Facility message The UUI performs end-to-end CSI capability information exchange including terminal and radio access network capabilities.

Using UUS3 business capabilities, solve the UUI interaction capability limitation through multiple interactions, especially some networks only support the UUI interaction capability limitation of up to 35 bytes.

Considering the impact of other services in the CS domain (especially call forwarding services), for CSI subscribers who subscribe to the calling number presentation (CLIP) and connected number presentation (COLP) services in the CS domain at the same time, the user who establishes a CS call can also follow the The display results of the calling number presentation (CLIP) and connected number presentation (COLP) services obtain the CS telephone number (that is, the E.164 number) information of the opposite end user connected to the CS call, and convert the CS telephone number information into The initial session protocol uniform resource locator (SIP-URL) corresponding to the user, and then directly initiate the subsequent IMS session of the CSI service to the user. The conversion includes but is not limited to generating the corresponding SIP-URL according to the predetermined rule according to the user CS telephone number and searching the address book according to the user's E.164 number to obtain the corresponding SIP-URL of the user.

In the case that the SIP-URL of the user cannot be converted directly based on the user's phone number and does not want to rely on the address book to query the peer user's SIP-URL, the user information (User Information) message is sent to UUI for interaction to obtain the peer user's initial session protocol- Uniform Resource Locator (SIP-URL).

For the application of the CSI service that adds an IP Multimedia Subsystem (IMS) session to an established circuit-switched (CS) call, when one of the two terminals of the CS call that completes radio access network capability interaction is handed over, the radio access network Capability changes (from original support to non-support, or from original non-support to support), or after the CSI service has established a CS call and an IMS session in any sequence, one of the two terminals of the call/conversation is switched As a result of the capability change of the wireless access network (from original support to non-support), the handover terminal uses the User Information (UserInformation) message in the UUS3 service to transmit the UUI to notify the capability update.

If after the CS interworking and IMS session have been established for the CSI service, the handover of one of the two parties in the call/session leads to a change in the capability of the radio access network (from original support to non-support), and the peer user on the side where the handover occurs After receiving the capability update notification sent by the switching terminal using the user information message in the UUS3 service, the terminal uses the user information message in the UUS3 service to confirm the notification, and initiates the release of the suspended IMS session due to the switching terminal losing the PS air interface connection , thus releasing the unnecessary occupied IMS and PS network resources.

Referring to Figure 2, in order to establish a CS call first and decide to enable the CSI service when the CS call is established, the process of completing the CSI phase 1 of capability information exchange is as follows:

Steps 1 to 6: First establish a CS call, and decide to enable the CSI service when the CS call is established, and request the network to provide UUS3 service capabilities through the indicator in the SETUP message.

Steps 7-12: Utilize the UUS3 in-call information exchange capability, and perform end-to-end capability interaction before establishing a CS call and preparing to add an IMS session to obtain the current peer CSI capability, especially the dynamically changing radio access network CSI capability.

Steps 13-22: The calling user of the CS call uses the COLP display results to determine the destination user of the IMS session and establishes an IMS session (if the called user of the CS call initiates an IMS session following the CSI service, the IMS session is determined according to the CLIP display results destination user), the IMS session establishment process is the same as that of the prior art.

Referring to Figure 3, after the CS call is established, it is decided to enable the CSI service, and the process of completing the CSI phase 1 of capability information exchange is as follows:

Steps 1-6: The CS call has been established, the user decides to enable the CSI service during the call, and requests the network to provide UUS3 service capabilities through a Facility message.

Steps 7 to 12: Use UUS3 in-call request and information exchange capabilities to perform end-to-end capability information exchange to obtain peer-end CSI capabilities.

Steps 13-18: Interact and obtain the peer user initial session protocol-uniform resource locator (SIP-URL) through the user information (User Information) message transmission UUI.

Steps 19-30: Use the SIP-URL to determine the destination user of the IMS session and establish the IMS session. The process of establishing the IMS session is the same as that of the prior art.

Referring to Figure 4, the processing flow when the wireless capability changes after the CS call and IMS session is established is as follows:

In the CSI service, the CS call and the IMS session have been established successively. The user terminal on one side of the call is switched, and the switched cell no longer supports the CS/PS air interface connection while maintaining the CS/PS air interface connection. After the switch, the terminal loses contact with the network on the PS;

Steps 1-3: The terminal that switches to the cell that no longer supports the CS/PS air interface connection at the same time uses the change in the transmission capability of the User Information (User Information) message during the UUS3 call to notify the peer user that the network no longer supports the CSI service.

Steps 4-6: After receiving the notification, the peer user returns the network capability change notification confirmation, and then the user terminal on the side receiving the notification initiates the release of the IMS session that may be suspended due to the handover user losing the PS air interface connection, Release the occupied IMS and PS network resources.

Referring to Figure 5, the process of realizing CSI service information interaction and establishing a subsequent IMS session by using the calling number display (CLIP) and connected number display (COLP) services is as follows:

Steps 1-7 and 9-13: The user and the relevant CS network normally process the CLIP/COLP service according to the CLIP/COLP service standard.

For CSI subscribers who subscribe to the calling number presentation (CLIP) and connected number presentation (COLP) services in the CS domain at the same time, the calling number presentation suppression and connected number presentation suppression subscriptions are not performed; during the CS call establishment process, the involved The user and his/her CS network normally process the CLIP/COLP service according to the CLIP/COLP service requirements. According to the CLIP service requirements, the E.164 number of the original calling user A is transferred to the final connected called side user. Pass the E.164 number of the finally connected user C to the original calling user A;

Step 8 and Step 14: respectively, the processes of the terminal of the called party C and the original calling party A respectively obtain and temporarily store the E.164 number of the opposite party according to the COLP/CLIP display results.

Step 15: After the CS call is established, when the original calling user A prepares to initiate a CSI service for a subsequent IMS session, according to the E.164 number of the peer user temporarily stored in the terminal, generate according to predetermined rules or search the address book to obtain the initial ID of the corresponding user C. Session Protocol Uniform Resource Locator (SIP-URL).

In steps 16-18, calling user A directly initiates a subsequent IMS session of the CSI service to user C.

Finally, in steps 19 and 20, after all the CS calls and IMS sessions corresponding to the CSI are over, the calling user A and the finally connected called side user C terminal clear the temporary E.164 number of the opposite end user;

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 the modifications and variations to the present invention fall within the scope of the claims of the present invention and equivalent technologies, these modifications and variations should also be included in the scope of the claims of the present invention.

Claims (22)

1. A method for implementing end-to-end information interaction, which is used to complete integrated CS bearer and IP Multimedia Subsystem (IMS) services (hereinafter referred to as CSI services) between terminals establishing a circuit switched (CS) call in a 3G network Necessary information exchange; it is characterized in that the user-to-user information (UUI) transmitted in the user-to-user signaling (UUS) service is used to interact and complete the terminal capability required by the CSI service between the terminals establishing the CS call. 2. The implementation method according to claim 1, characterized in that, the UUI delivered in the UUS service is the UUI delivered in the UUS1, UUS2 or UUS3 service; the UUI delivered in the UUS1 service includes UUS1’s CS call control The UUI carried in the message, the UUI transmitted in the UUS2 and UUS3 services includes the UUI carried in the user information message. 3. The implementation method according to claim 1 or 2, characterized in that the terminal capability required to complete the CSI service is divided into a first part and a second part for interaction; the first part is the terminal's ability to support the CSI service , the support capability includes maintaining the CS/PS air interface connection at the same time, and the ability to associate successively established CS calls and IMS sessions according to service application requirements. The second part is the media type and format supported by the terminal in IMS sessions and messages Ability. 4. The implementation method according to claim 3, characterized in that, the first part of interaction is completed by using the UUS service, and the second part of interaction is completed by using the offer/response (offer/answer) mechanism of the Session Description Protocol (SDP) during the establishment of the IMS session. Partial interaction. 5. The implementation method according to claim 3, wherein the interaction between the first part and the second part is completed by using multiple UUI transfers between terminals. 6. The implementation method according to claim 1 or 2, wherein, if it is determined to enable the CSI service during the CS call establishment process, requesting the network to provide UUS1, UUS2 or UUS3 services through a call establishment request message; After the CS call is established and it is determined to enable the CSI service, it requests the network to provide the UUS3 service through a function message. 7. The method according to claim 1 or 2, further characterized in that the terminal establishing the CS call transmits each other's initial session protocol Uniform Resource Locator (SIP-URL) to the opposite end through the UUI transmitted by UUS, When adding a subsequent IMS session of the CSI service, the IMS session is directly initiated to the user corresponding to the SIP-URL. 8. The method according to claim 1 or 2, wherein the terminal establishing the CS call obtains the CS call according to the display results of the calling number presentation (CLIP) and connected number presentation (COLP) services respectively. The CS phone number information of the end user that is finally connected, and according to the CS phone number information according to a predetermined rule to generate or search the address book to obtain the corresponding SIP-URL of the user, and then directly send to the SIP URL when adding the subsequent IMS session of the CSI service. - The user corresponding to the URL initiates an IMS session. 9. A method for implementing end-to-end information interaction, which is used in a 3G network to complete integrated CS bearer and IP Multimedia Subsystem (IMS) services (hereinafter referred to as CSI services) between two terminals establishing a CS call Information exchange; it is characterized in that, between the two terminals, use the user-to-user information (UUI) transmitted in the UUS3 service to interact and complete part or all of the information required for the CSI service. 10. The implementation method according to claim 9, wherein, if it is determined during the CS call establishment process that information exchange related to the CSI service is required, the network is requested to provide the UUS3 service through a call establishment request message; if the CS call establishment process After determining that information exchange related to the CSI service is required, the network is requested to provide the UUS3 service through a function message. 11. The implementation method according to claim 9, wherein the CSI service refers to adding an IMS session to an established CS call between two terminals, and the information required by the CSI service includes terminal capability, wireless Access network capability and Initial Session Protocol Uniform Resource Locator (SIP-URL); or, the CSI service refers to adding a CS call to an established IMS session between two terminals, and the information required by the CSI service is Varying radio access network capabilities. 12. The implementation method according to claim 11, wherein the terminal capability includes the terminal's ability to support CSI services and the capability of the terminal to support media types and formats in IMS sessions and messages; the wireless interface The network access capability refers to the capability of simultaneously maintaining the CS/PS air interface connection; the terminal's ability to support CSI includes simultaneously maintaining the CS/PS air interface connection and associating successively established CS calls and IMS sessions according to service application requirements. 13. The implementation method according to claim 11 or 12, characterized in that, for the CSI service of adding an IMS session to the established CS call, it can be transmitted through the UUS3 service when preparing to initiate the subsequent IMS session of the CSI service The UUI exchanges some or all of the information required by the CSI service between terminals. 14. The implementation method according to claim 13, characterized in that, for adding the CSI service of the IMS session to the established CS call, using the terminal's ability to support the CSI service in the UUI interactive terminal capability delivered in the UUS3 service, During the establishment of the IMS session, the offer/answer (offer/answer) mechanism of the Session Description Protocol (SDP) is used to exchange the capabilities of the media type and format supported by the terminal in the IMS session and message. 15. The method according to claim 13, characterized in that, the two terminals respectively obtain the final connected pair of the CS call according to the display results of the calling number presentation (CLIP) and connected number presentation (COLP) services. end user's CS phone number information, and according to the CS phone number information according to a predetermined rule to generate or search the address book to obtain the user's corresponding SIP-URL, and then directly to the corresponding SIP-URL when adding the subsequent IMS session of the CSI service A user initiates an IMS session. 16. The implementation method according to any one of claims 9 to 12, characterized in that, utilizing the business capabilities of UUS3, the information interaction is completed by transmitting UUI multiple times between terminals, so as to realize the information beyond the length of a single interaction information interact. 17. The method according to claim 9, characterized in that, if the switching of one of the two terminals of the call/conversation leads to a change in the capability of the wireless access network, the switched terminal uses the UUI delivered in the UUS3 service to notify the opposite user Perform capability updates. 18. The method according to claim 17, characterized in that, after the CS call and IMS session have been established, the peer user uses the UUS3 The user information message in the service confirms the notification, and initiates the release of the suspended IMS session due to the handover terminal losing the PS air interface connection, so as to release the unnecessary occupied IMS network and packet (PS) network resources. 19. A method for realizing end-to-end information interaction, which is used in a 3G network to add a CSI service of an IMS session to an established CS call, and the terminal signs up for a calling number display (CLIP) and a connected number in the CS domain at the same time Show (COLP) business, it is characterized in that, the method comprises the steps: The calling terminal and the called terminal establishing the CS call obtain the CS telephone number information of the end user finally connected to the CS call according to the display results of the calling number presentation (CLIP) and connected number presentation (COLP) services respectively; The calling terminal and the called terminal respectively convert the CS telephone number information into an initial session protocol uniform resource locator (SIP-URL) corresponding to the user; The calling terminal and the called terminal directly initiate a subsequent IMS session of the CSI service to the opposite terminal according to the obtained SIP-URL. 20. The implementation method according to claim 19, wherein the calling terminal and the finally connected called terminal obtain the E.164 number of the opposite end user and store it temporarily, and prepare to initiate the subsequent IMS session of the CSI service Before converting the E.164 number of the other party to the SIP-URL corresponding to the user. 21. The implementation method according to claim 19 or 20, wherein converting the CS phone number information into a SIP-URL includes but not limited to generating a SIP-URL corresponding to the user according to predetermined rules based on the user's E.164 number. URL and search the address book according to the user's E.164 number to obtain the corresponding SIP-URL of the user. 22. The method according to claim 19, characterized in that, after all the CS calls and IMS sessions corresponding to the CSI service are ended, the calling terminal and the finally connected called terminal clear the temporarily stored user E.164 Number.

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