WO2007143896A1

WO2007143896A1 - A method, system and apparatus for realizing multimedia call service

Info

Publication number: WO2007143896A1
Application number: PCT/CN2007/001614
Authority: WO
Inventors: Geng Wang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-05-25
Filing date: 2007-05-17
Publication date: 2007-12-21
Also published as: CN101080097A; CN101080097B

Abstract

A method, system and apparatus for realizing multimedia call service in circuit switched domain shortens the time length required for establishing video dialogue by means of media negotiation through carrying service channel. The method comprises: A. each party participating in multimedia call service implements multimedia call service type and/or media negotiation through call control signaling channel (S1); B. the media stream logic channel is established based on the negotiation result, so as to realize multimedia call service (S2). The invention is based on outband negotiation, so the start time of negotiation is free from the restriction of carrying service channel establishment, and thus the time consuming for establishing video dialogue is shortened.

Description

Method, system and device for realizing multimedia call service

The present invention relates to the field of wireless communications, and in particular, to a method, system and apparatus for implementing a multimedia call service in a circuit domain. Background technique

CS DOMAIN multimedia call service is an important service in the third generation mobile communication system, and it is one of the iconic services that the third generation mobile communication is different from the second generation. This kind of business enables users to see the image of the other party while making a voice call, which is a business with important practical application value.

The WCDMA third generation mobile communication defines a system architecture to accomplish various services, including multimedia call services. The basic network elements included in this system architecture are: user equipment UE, WCDMA system base station NODE B, WCDMA system base station controller RNC, MGW and MSC SERVER. A basic networking relationship of the system architecture is shown in Figure 1.

UE: The terminal device used by the user, often referred to as a mobile phone.

NODE B: Mainly responsible for wireless signal transmission and reception.

RNC: Mainly responsible for the management of the wireless access network.

MGW: Mainly responsible for the management of various bearer resources and the actual operation of the connection network.

MSC SERVER: It is the core of the system. It is mainly responsible for the logical control of various services, uniformly scheduling various network resources, and generating call records.

a interface: air interface signaling channel.

b interface: Business data channel.

c interface: Media gateway control signaling channel.

d interface: BICC/ISUP/SIP signaling channel.

Based on the above system architecture, the WC DM A third generation mobile communication system provides a multimedia call service called Multimedia call (see 3GPP TS 24, 008), which implements a schematic diagram of the architecture. As shown in Figure 2, this service can not only complete the voice call function and data communication function, but also complete the multimedia call function.

In order to implement multimedia call services, the following signaling and protocols are required:

1. Call control signaling: There are two types, one is air interface signaling for terminal and network side equipment for call control, and the other is call control signaling (ie, relay signaling) between network devices. They are used to deliver messages such as originating, ringing, answering, disconnecting, etc., as well as negotiating to establish bearer service channels.

2. H.245 Multimedia Communication Control Protocol: The H.245 protocol defined by ITU-T defines how to establish multiple media stream logical channels through a series of negotiation within a single service data channel. The terminal capability negotiation process is defined ( After the process is performed, both parties can know the media types supported by the other party, such as voice, video, etc., master-slave discrimination (determination of master-slave relationship), and multiplexing control information interaction (in order to support multiple transmissions in one service channel simultaneously) Media stream), open and close the media stream logical channel, etc.

3. 氐 bit rate multimedia communication multiplexing protocol: The H.223 protocol developed by ITU-T enables communication parties to simultaneously transmit multiple voice, video and data media streams using a single service data channel. It needs to work in conjunction with H.245. Referring to FIG. 3, which is a structural hierarchy diagram of H.223, an application layer (that is, a service object of H.223) is a module that provides and receives various voices, videos, or data (for example: a microphone of a mobile terminal, The display or camera), the lowest layer, the physical layer is a service data channel. As can be seen from Figure 3, H.223 supports the transmission of multiple media streams using a single physical service channel.

4, 3G-324M terminal is a terminal defined by 3GPP for multimedia call service, as shown in Figure 4, it mainly includes three parts: First, the media processing module, including: voice, video and data processing part; It is a system control module, which is responsible for interacting with the network side and performing call control. On the other hand, it performs operations such as establishing and releasing logical channels with the peer device through the H.245 protocol. Third, the H.223 protocol processing module is responsible for Reuse and decomposition of voice, video, data and H.245 control information.

As shown in FIG. 2, the multimedia call service mentioned in the 3GPP TS 24.008 has the following features: In the service, the role of the network is limited to completing the call connection and establishing a link for the communication parties. The service channel is carried, and the establishment of the logical channel of the media stream is not established; the operation of establishing the logical channel of the media stream is completed by the communication parties in an end-to-end manner after the call is connected. Therefore, the process of establishing a video conversation consists of two phases: In the first phase, call completion processing of call origination, ringing, and answering is completed; when the called party answers, the network establishes a bearer service channel between the calling parties; In the second phase, the calling parties use their respective terminals in the established bearer service channel,

The in-band negotiation is performed in the manner specified in H.245, and various media stream logical channels are established in the bearer service channel to deliver voice, video, and data media streams, and each media stream is in the bearer service channel, according to H.223. The specified multiplexing method is passed.

Since the existing solution completes the media negotiation in an end-to-end manner, it is necessary to start the negotiation after the bearer service channel is established, which leads to the above two stages in the process of establishing a video dialogue, which makes the establishment The video conversation takes a relatively long time. Compared with the establishment of a normal voice call, only the first phase can be completed. If it takes about 6 seconds to complete the first phase and about 5 seconds to complete the second phase, then the call is initiated from the user. At the beginning, it takes more than 10 seconds to establish a video conversation with the other party. Since the process of establishing a video conversation in the existing scheme is time consuming, the scheme has a poor user experience in this aspect.

Moreover, since the process of establishing the logical channel of the media stream in the foregoing solution is completely completed by the communication parties in the bearer service channel in an "in-band end-to-end" manner, the network side MSC SERVER acts on the logical channel of the media stream in the bearer service channel. The establishment of the situation is uninformed, making it difficult to add some additional features to the multimedia call. For example: media insertion function during call setup (when the call is dialed, the call is forwarded, or the ring tone is to be played to the calling user, the network side plays the voice or video prompt for the calling user); the media insertion during the call (When HOLD occurs, the network side plays the waiting tone or video by the HOLD party; or the smart playback during the call, including the balance prompt, recharge prompt, etc.); and some supplementary services of the call completion class.

These services have been commonly used in 2G networks. As a more advanced network, 3G networks should not support similar functions. Due to the limitations of the architecture of the existing WCDMA circuit domain and the implementation of the multimedia call service, the current 3G network cannot implement some functions related to media stream processing that require the participation of the network side device. Summary of the invention

Embodiments of the present invention provide a method, system, and apparatus for implementing a multimedia call service in a circuit domain, so as to shorten the length of time required for media negotiation through a bearer service channel to establish a video session.

The method of the embodiment of the present invention includes: A. The parties participating in the multimedia call service perform the negotiation of the multimedia call service type and/or the media through the call control signaling channel; B. according to the negotiation result, complete the establishment of the media stream logical channel, Implement multimedia call services.

The system for implementing a multimedia call service according to an embodiment of the present invention includes: an MGW supporting service data transmission, the system further comprising: an MSC SERVER, which supports transmission of media flow control information by using a call control signaling channel; The party terminal, through the MSC SERVER, uses the call control signaling channel to perform multimedia call service type and/or media negotiation, and implements a multimedia call service through the MGW.

The mobile switching center server of the embodiment of the present invention has a function of controlling call connection, and includes: an air interface, configured to transmit information related to media flow control; and a relay signaling interface, configured to transmit information related to media flow control; a media gateway control interface, configured to transmit media flow control information; a media flow control module, configured to participate in negotiation of a multimedia call service type and/or media through an air interface and a relay signaling interface, and control the media flow through the media gateway control interface transmission.

The terminal of the embodiment of the present invention includes: an encapsulating unit, configured to carry the media control information in the call setup signaling; or encapsulate the multimedia call service type and/or the media negotiation information according to the air interface signaling specification; or the multimedia call The service type information and/or the media negotiation information are carried in the UUS signaling message; and the air interface is used to send the encapsulated unit encapsulated signaling message to the network side.

In the embodiment of the present invention, the parties participating in the multimedia call service perform media negotiation by using the call control signaling channel (out-of-band) established during the call connection, and no longer perform media negotiation through the bearer service channel (in-band), so the video is established. The process of dialogue does not have to go through two phases of the existing programme, which provides the conditions for shortening the time to establish a video conversation. DRAWINGS 1 is a schematic structural diagram of an existing WCDMA system;

2 is a schematic diagram of an implementation framework of an existing multimedia call service;

Figure 3 is a schematic diagram showing the structure of the existing H.223;

Figure 4 is a schematic structural view of a conventional 3G-324M terminal;

FIG. 5 is a schematic structural diagram of a system according to an embodiment of the present invention; FIG.

6 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

7 is a schematic structural diagram of an MSC server participating in media negotiation and controlling media stream transmission according to an embodiment of the present invention;

8 is a schematic structural diagram of an MSC server according to an embodiment of the present invention;

9 is a flow chart of steps of a method according to an embodiment of the present invention;

10 is a flowchart of media negotiation performed by a calling party when initiating a call according to an embodiment of the present invention; FIG. 11 is a schematic diagram of an implementation framework of an MSC server participating in media negotiation as a media negotiation party according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of an implementation framework of an MSC server performing a proxy function to participate in media negotiation according to an embodiment of the present invention; FIG.

FIG. 13 is a schematic diagram of an implementation framework of an MSC server serving as a transparent transmission network element of a media negotiation party according to an embodiment of the present invention;

14 is a flowchart of performing media negotiation at any time after a call control signaling channel is established according to an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of an interworking implementation according to an embodiment of the present invention;

16 is a signaling flowchart of Embodiment 1 of the method;

17 is a signaling flowchart of Embodiment 2 of the method;

18 is a signaling flowchart of Embodiment 3 of the method;

FIG. 19 is a schematic structural diagram of an implementation manner of a media stream transmission manner in Embodiment 3 of the method;

20 is a schematic structural diagram of an implementation manner of a media stream transmission method in Embodiment 4 of the method;

21 is a signaling flowchart of Embodiment 5 of the method;

22 is a schematic structural diagram of an implementation manner of a media stream transmission method in Embodiment 5 of the method; 23 is a signaling flowchart of a method embodiment 6;

FIG. 24 is a signaling flowchart of Embodiment 7 of the method. detailed description

In order to perform the negotiation of the multimedia call service type and/or the media in the call control signaling channel, thereby shortening the length of time required for establishing the multimedia call, the embodiment of the present invention provides a system for implementing the multimedia call service, as shown in FIG. It includes: MSC SERVER, MGW and parties involved in the multimedia call service.

The MSC SERVER supports transmitting media stream control information by using a call control signaling channel, and performing call connection control.

The MGW supports transmission of service data.

The terminal, through the MSC SERVER, uses the call control signaling channel to perform media negotiation, and establishes a media stream channel with other communication parties for multimedia communication.

Referring to FIG. 6, the terminal (ie, the terminal in the embodiment of the present invention) includes: an encapsulating unit and an air interface that are connected to each other.

The encapsulating unit is configured to carry the media control information in the call setup signaling; or encapsulate the multimedia call service type and/or the media negotiation information according to the air interface signaling specification; or the multimedia call service type information and/or the media The negotiation information is carried in the UUS signaling message.

The air interface is configured to send the signaling message encapsulated by the encapsulating unit to the network side.

In order to enable the network to provide users with additional functions related to media stream processing, such as: 3G network compatible with media insertion function in 2G network (failed playback, display call transfer, etc.), see Figure 7 (Figure 7 The MSC SERVER included in the system of the embodiment of the present invention may also participate in media negotiation and control media stream transmission. The MGW included in the system of the embodiment of the present invention also supports combining multiple individual media streams into one bearer service. The transmission in the channel supports the decomposition of the multiplexed stream into individual media streams, and supports the network processing of each body stream.

As shown in FIG. 8, the MSC SERVER (ie, the MSC SERVER in the embodiment of the present invention) includes: an air interface, a relay signaling interface, and a media gateway control respectively connected to the media flow control module. Interface.

The air interface is used to interact with the terminal side, and the relay signaling interface is used for interaction with other offices.

The MSC SERVER interacts to transmit the negotiation related signaling of the multimedia call service type and/or the media between the calling party and the called party, and can enable the media flow control module to learn or participate in the interactive multimedia call service type and/or Or media negotiation information. The multimedia call service type information may represent default media flow control information (including at least one of the following information: media stream codec mode, media stream specific parameters, and multiplexing control parameters). The media negotiation information includes, but is not limited to: a call control signaling message carrying negotiation information of a multimedia call service type and/or media, and a new media negotiation message defined by an air interface and a relay signaling interface signaling specification. And a UUS signaling message carrying media negotiation signaling. The media flow control module is configured to control the MGW through the media gateway control interface, and control the media stream transmission according to the media negotiation result.

The media gateway control interface is configured to transmit media flow control information to complete control of the media stream by the media flow control module.

In order to achieve interworking with the prior art, the MSC SERVER further includes: an identification module, configured to identify whether the types of parties participating in the multimedia call service are the same, and enable the MSC SERVER to perform a multimedia call service with the parties according to the identification result. Negotiation of type and / or media, and complete interoperability.

The MSC SERVER and the MGW in the system may be combined, and the media gateway control interface is an internal interface; the MSC SERVER and the MGW in the system may be separated (not limited to corresponding), and the media gateway control interface is Mc interface.

Applying the above system and device, the embodiment of the present invention provides a method for implementing a multimedia call service. Referring to FIG. 9, the following main steps are included:

Sl. The parties participating in the multimedia call service perform the negotiation by using a call control signaling channel. According to the timing of initiating the negotiation, the method of the embodiment of the present invention can be divided into two cases:

Case 1: When the calling party initiates a call, the call setup signaling carries the information required for the negotiation, that is, when the call control signaling channel is established, the negotiation is initiated to the called party. Case 2: At any time after the call control signaling channel is established, the primary 'calling party and/or called party negotiates with the other party using a separate media negotiation message.

If the MSC SERVER participates in the negotiation, the MSC SERVER can act as a party to the negotiation in either of the above cases, or perform the proxy function, or act as a transparent transmission network element of the negotiating parties.

52. According to the negotiation result, the establishment of the logical channel of the media stream is completed to implement the multimedia call service.

53. The calling party, the called party or the network tears down the call, and the network releases the resources allocated for the multimedia call, and ends the call.

Further, the above two cases are separately described.

For case 1: When the calling party initiates a call, the call setup signaling carries the information required for negotiation for negotiation. See Figure 10, which includes the following steps:

101. The calling party initiates a multimedia call.

In this case, the negotiation can only be initiated by the calling party.

The calling party initiates a multimedia call to the called party, and carries the relevant information of the multimedia call service type and/or media required for the negotiation in the existing call control signaling (call setup signal), and sends the information to the other party.

The multimedia call service type information may represent default media control information (including at least one of the following: media stream codec mode, media stream specific parameters, and multiplexing control parameters).

The media control information includes: multiplexing control parameters (for controlling how to use a single bearer service channel to transfer multiple media streams) and information to be manipulated (ie, what operation is to be performed on the media stream). The information to be operated includes: creating new media stream information, modifying media stream information, or turning off media stream information.

In general, if the information to be operated is new media stream information, it includes: media type (voice, video or data) of the streaming media, codec mode, media stream specific parameters (such as video size), and media stream direction. (forward or backward or two-way).

Generally, if the operation information is to modify the media stream information, the method includes: the parameter to be modified and the identifier of the media stream. Generally, if the operation information is to turn off the media stream information, the method includes: the media stream identifier.

In special cases, depending on the pre-implicit convention of the media stream parameters of the multimedia call in the communication entity, the media stream information that needs to be explicitly delivered is also different, and the pre-agreed information does not need to be explicitly delivered to the other party. (For example: if the newly created media stream must be in a fixed direction, this type of information does not need to be explicitly passed, otherwise the same).

102. The MSC SERVER connects the call to the called party (the MSC SERVER itself can be used as the called party), and simultaneously performs the processing of the multimedia call service type and/or the media negotiation.

If the MSC SERVER does not participate in the negotiation, the calling party and the called party negotiate through the call control signaling channel; if the MSC SERVER participates in the negotiation, the MSC SERVR performs the negotiation process in the following manner:

a. Referring to Figure 11 (Figure 11 hollow port or air interface), MSC SERVER can negotiate with the other party as a negotiation party (for example: call failure playback scene). The MSC SERVER negotiates with the other party through the call control signaling channel.

b. Referring to Figure 12 (Figure 12, the air interface is the air interface), the MSC SERVER performs proxy functions (such as: multimedia ring back tone scene, ECT scene). The MSC SERVER negotiates with the parties through the call control signaling channel.

c. See Figure 13 (the air interface of Figure 13 is the air interface). As a special case of the MSC SERVER performing proxy function, in the general call scenario without inserting additional functions, MSC SERVER does not interfere in order to improve efficiency and save network resources. The negotiation process of the parties is only used as a transparent transmission network element of the parties to the negotiation. The parties negotiate from the call control signaling channel through the MSC SERVER transparent negotiation information. While the parties negotiate, the MSC SERVER records the transparent negotiation information. When the additional function needs to be inserted, the MSC SERVER can negotiate according to the record. Information, the way to convert to a or b.

103. The called party direction MSC SERVER sends the negotiation result confirmed by the called party.

The called party can send a negotiation result message confirmed by the called party to the MSC SERVER by using a ringing, call progress or response message.

104. The MSC SERVER delivers the mediator result to the calling party. 105. Complete establishment of a logical channel of the media stream to implement a multimedia call service.

After the MSC SERVER establishes the bearer service channel for the communication parties, the MSC SERVER adopts different processing modes when participating in the media stream establishment and teardown, as compared with the different processing methods of the SC SERVR in step 102. ·

Corresponding to a: MSC SERVER controls the MGW to establish a media stream logical channel (including but not limited to two media stream logical channels) with the other party in the bearer service channel; after that, the MSC SERVER can control the MGW to send and send on the media stream logical channel. / or receive media streams.

Corresponding to b: MSC SERVER control The MGW establishes a media stream logical channel with each party in the bearer service channel; afterwards, the established media stream logical channels are adapted and connected to implement media stream interaction of each party.

Corresponding to c: MSC SERVER controls the multiplexed media stream between the MGW transparent communication parties. Moreover, the MSC SERVER can switch to the processing manner described in the above a or b according to the requirements of its own business logic and according to the media stream channel establishment record thereof.

106. As an optional step, when the communication parties have a willingness to change the media negotiation that has already been performed, a new negotiation process may be initiated by one party to the other party. If the media stream has been established, the media stream needs to be newly pressed. The result is modified accordingly.

For case 2: At any time after the call control signaling channel is established, the calling party and/or the called party negotiate with each other using a separate negotiation message. Referring to Figure 14, the following steps are included:

201. The calling party initiates a multimedia call to establish a call control signaling channel.

This step is the same as the existing call connection process.

202. The calling party and/or the called party initiate a negotiation with the other party using a separate media negotiation message.

In this case, since the calling party and/or the called party use a separate negotiation message to carry the information required for the negotiation to initiate negotiation, the parties may at any time before the call is detached (including: bearer service channel) Any number of message interactions are performed before or after the establishment, so that negotiation can be performed without waiting for a call control message to interact, which is not affected by the existing call connection process.

The separate media negotiation message can be:

1. The new negotiation message is newly defined in the call control signaling channel. 2. Carrying media negotiation information UUS signaling message.

Since the length of the content that can be accommodated by the individual negotiation message is limited, if the length of the content of the individual negotiation message can not carry a complete media negotiation information, the negotiation information will be carried in a separate negotiation message. And determining, by the value of a specific byte or bit in the separate negotiation message (such as: the last byte or a bit), whether the individual negotiation message carries complete negotiation information (for example, 0 indicates that the required information is required. Segment, 1 means complete signaling is included).

In order to ensure the integrity of the negotiation signaling reception, if a plurality of separate media negotiation message segments carry a complete negotiation information, the negotiation information segments are numbered according to the segmentation order. The other party performs the number continuity check on the received information fragments, and if the discontinuity is found, the relevant negotiation information can be discarded.

The content of the media control information sent by the calling party and/or the called party to the other party through the relevant signaling is the same as described in the step 101 of the first case, and the H.245 specification may be adopted in the form.

203. The MSC SERVER routes the relevant signaling to the other party (the MSC SERVER itself can serve as a participant in the negotiation), and performs negotiation processing at the same time.

The same as described in step 102 of case one.

204. Send a confirmed negotiation result to the direction MSC SERVER.

In this case, it is not limited by the call connection procedure, and the other party can send a confirmed negotiation result to the MSC SERVER at any time after the negotiation is initiated.

205. The MSC SERVER delivers the media negotiation result to the negotiation initiator.

206. Complete establishment of a logical channel of the media stream to implement a multimedia call service.

After the MSC SERVER establishes the bearer service channel for the communication parties, the MSC SERVER adopts different processing modes when participating in the media stream establishment and teardown, as compared with the different processing modes of the MSC SERVR in step 203. The related content is the same as described in step 105 of Case 1.

207. As an optional step, when the communication parties have a willingness to change the media negotiation that has already been performed, a new media negotiation process may be initiated by one party to the other party. If the media stream has been established, the media stream needs to be newly pressed. The results are modified accordingly.

So far, the multimedia call is implemented by the negotiation through the call control signaling channel (out-of-band). The process of the business is outlined.

In order to balance the terminals and the network, the embodiment of the present invention also proposes an interworking solution, as shown in FIG. 15 (the air interface in FIG. 15 is an air interface).

First, the MSC SERVER identifies the types of parties involved in the multimedia call service, and accordingly determines whether it supports the negotiation of the multimedia call service type and/or media through the call control signaling channel.

Wherein, if the parties participating in the multimedia call service refer to the terminal participating in the multimedia call service, the MSC SERVER identifies the types of parties participating in the multimedia call service in one of the following ways:

1. When the terminal registers with the network, the terminal indicates its type to the network, and is saved by the MSC SERVER;

2. The calling terminal indicates its type to the MSC SERVER through call setup signaling; the called terminal indicates the type to the MSC SERVER through a message (such as a paging response message) sent by the called party to the network;

3. The MSC SERVER identifies the type according to the media control information carried by the signaling sent by the terminal;

4. The MSC SERVER obtains the type of the terminal by using the classmark query (the classmark query mechanism, that is, defining and storing the feature information of the terminal on the terminal side, including the type of the terminal, for the network side query).

If the parties participating in the multimedia call service refer to the network adjacent to the network where the MSC SERVER is located, the type of the neighboring network is indicated by performing data configuration on the network where the MSC SERVER is located.

Then, the MSC SERVER performs the proxy function, and performs the negotiation of the multimedia call service type and/or the media with the parties according to the types of the parties participating in the multimedia call service, and performs bearer interworking. The following describes how to communicate with each other for the two cases described in step S1.

For the first situation, we need to communicate from the following three aspects:

1. Interworking of call signaling: The process of initiating a call, ringing, answering, and disconnecting is the same. The process of call connection can be directly interworked. However, the call setup signaling of the existing multimedia call service does not include the media control information, which is different from the embodiment of the present invention. Therefore, the MSC SERVER needs to adapt the content of the call connection signaling on both sides, and when the signaling is sent to the other party, The conversion process is performed according to the specifications of the other party.

2. Interworking of bearers: Both BS30s are used as the mode of carrying media streams, which can directly carry each other.

3. Interworking of media streams: The existing solution adopts in-band H.245 signaling as a means for managing media streams, and media negotiation is started after the call is answered, and the solution of the embodiment of the present invention may have been completed when the call is answered. Media consultation. No matter whether the signaling mode or the negotiation timing is different, media channel control interworking needs to be performed on these two aspects. First: Interoperability of the media establishment process. After the new (invention) terminal or the network completes the negotiation, the old (existing) terminal or the network starts to negotiate. Therefore, the MSC SERVER is required to process the media streams on both sides, and on the one hand, the old terminal or the network is established. The media stream between the new terminal or the network, on the other hand, establishes a media stream with the old terminal or the network, and finally connects the media streams on both sides to complete the interworking of the media streams. Second: Interworking of media control signaling methods. The MSC server and the new terminal or network will negotiate using the new signaling mode, and the MSC SERVER and the old terminal or network will transmit the media flow control information in the manner of H.245.

For situation 2, we need to communicate from the following three aspects:

1. Interworking of call signaling: The call process of initiating a call, ringing, answering, and disconnecting is the same, and the connection process can be directly interworked.

3. Interworking of the media stream: The existing solution is to start the negotiation after the call is answered. The solution of the embodiment of the present invention can start the negotiation when the called party receives the call setup signaling. Therefore, the timing of negotiation is different, and the interworking of the media stream establishment process is required. After the new terminal or the network completes the negotiation, the old terminal or the network starts to negotiate. Therefore, the MSC SERVER is required to process the media streams on both sides, and on the one hand, the old terminal or the network establishes the media stream with the new terminal or the network, and the other The aspect establishes a media stream with the old terminal or the network, and finally integrates the media streams on both sides to complete the interworking of the media streams.

The process of interoperability is now complete.

The following is specifically described by five embodiments. Method Embodiment 1: A loosely associated scheme for negotiation and call connection of a multimedia call service type and/or media. The call scenario of this example is that the user 1 and the user 2 make a videophone call, after two offices, respectively, \^(1 and]\48. 2. Referring to FIG. 16, the following steps are included:

1. User 1 The user 2 initiates a multimedia call, and the call arrives at UE2 via MSC1 and MSC2. UE2 judges that the service type in the SETUP message is a multimedia call, and then performs the following two operations concurrently.

2. The concurrent operation is to process the negotiation process of the media stream logical channel between the users. The MSC may select to act as a media negotiation party, perform the proxy function, and act as one of the transparent transmission network elements to participate in the process.

3. Concurrent operation 2 is to continue the call connection and complete the ringing and response processing. When responding, the network completes establishing a bidirectional bearer service data channel between UE1 and UE2. At this time, if the MSC chooses to perform the proxy function, the MSC SERVER controls the MGW to establish a media stream logical channel with the adjacent terminal or the MGW in the bearer service data channel. If the MSC selects as the transparent transmission network element, UE1 and UE2 actually establish a media stream logical channel in the bearer service channel.

4. When Step 2 and Step 3 are completed, the user enters the call state, and finally, when the call ends, the disconnection process is performed.

Note 1: If the operator needs to charge the user according to the type or number of media streams established between users, the MSC SERVER can perceive the type or number of media streams established between users according to the media negotiation process, thereby achieving this. A demand.

Note 2: If the caller initiates a call, the dialed number is a non-existent number. The MSC where the caller is located can make a voice or video prompt to the caller. The MSC will choose to be the media negotiation party, and the MSC and the calling terminal. The media stream is negotiated and established. After the media stream channel is established, the MSC can make a voice or video prompt to the calling user.

Note 3: The process of taking the roaming number is omitted.

Method Embodiment 2: The optimization of the first example, that is, the simplified media stream logical channel establishment process. Call scenario of this embodiment: User 1 initiates a videophone call to User 2, passing through two offices, MSC 1 and MSC 2, respectively.

In addition, after a certain standardization of the terminals of the two users, the following rules can be selectively formulated. 1. The terminal has the same capabilities, eliminating the need to exchange capability information when calling.

2. The master-slave relationship is determined in a fixed manner, such as determining that the calling party is from the master, eliminating the need to determine the master-slave relationship at the time of the call.

3. The terminal adopts the same multiplexing table, eliminating the need to interactively multiplex table information during the call.

Based on the rules set forth above, it is advantageous to further reduce the total time from the initiation of the call to the establishment of the video session.

Referring to Figure 17, the main steps of this example are basically the same as in Example 1.

Method Embodiment 3: One of the schemes for the negotiation of the multimedia call service type and/or the media and the call connection. Call scenario of this embodiment: User 1 initiates a videophone call to User 2, passing through two offices, MSC 1 and MSC 2, respectively.

This example normalizes videophones:

1. A videophone consists of one voice, one video, and one data (optional).

2. There are many options for the encoding and decoding of voice and video. It is necessary to negotiate in the process of service to make the NEs consistent.

3. The multiplex table is determined by the calling terminal. In addition to the function of the H.223 multiplex table, the multiplex table also increases which entry in the field specification table is used to deliver voice, which entry is used to deliver video, and which table The item passes the data and is sent to the called terminal by each office along the way. (If a standard multiplex table is specified, the operation of transferring the multiplex table at the time of the call can be eliminated. This embodiment selects the transfer multiplex table)

See Figure 18, which includes the following main steps:

1. User 1 initiates a multimedia call to User 2, and the call arrives at UE2 via MSC1 and MSC2. When the UE1 initiates a call, it indicates that the service type is a multimedia call service in the SETUP message, and carries the multiplexing table information, so that the two parties can simultaneously transmit multiple media streams by using a single service channel, and the SETUP message also carries the voice supported by the calling UE. And a video compilation list for the called party to select for codec negotiation.

2. After receiving the call, the called terminal UE2 selects the voice and video codec supported by the calling party carried in the SETUP message, and puts the result into the ALERTING message sent to the calling UE, and simultaneously to the called user. A ringing prompt is issued. 3. When the called party answers and the service channels of UE1 and MSC1, MSC1 and MSC2, and MSC2 and UE2 are established, the calling party and the called UE1 can establish media stream logic according to the negotiated voice and video codec and the multiplexing table. Channel to pass voice, video, and data (optional).

The way the media stream is transmitted is shown in Figure 19. The media gateway on the network side can only transparently transmit the media stream. (Note: The process of taking the roaming number is omitted)

Method Embodiment 4: The multimedia call service type and/or the media negotiation and the call connection are strongly associated with the second scheme. Call scenario of this embodiment: User 1 initiates a videophone call to User 2, passing through two offices, MSC 1 and MSC 2, respectively. This example is the same as the control flow of the third embodiment. The difference lies in the establishment of the logical channel. This example uses the segmentation establishment mode: UE1 and MSC1, MSC1 and MSC2, and MSC2 and UE2 segmentally establish a media stream logical channel, as shown in FIG. .

Method Embodiment 5: The negotiation of the multimedia call service type and/or the media is strongly associated with the call connection. The call scenario of this embodiment: User 2 signs the presence or absence of the forward forwarding service, and User 1 initiates a videophone call to User 2, after two offices, namely MSC 1 and MSC 2, User 2 does not answer, the call is timed out. Was forwarded to user 3. See Figure 21, which includes the following main steps:

The process of establishing a videophone between UE1 and UE2 is the same as that of the third example.

3. UE2 does not answer the call. Since UE2 subscribes to the call forwarding service, after MSC SERVER 2 has no response timeout, MSC2 forwards the call to UE3 (forward to destination). Since the voice, video codec, and multiplex table of UE1 are already established in steps 1 and 2, after the call is transferred to UE3, the media stream processing needs to be processed into two segments, one segment being UE1 and MSC2. The other segment is between MSC2 and UE3. As shown in Figure 22, MSC2 needs to adapt the two media stream logical channels. First, the media stream logical channels in the service channels on both sides are decomposed, and then the media stream logical channel is adapted. (Note: The process of taking the roaming number is omitted)

4. UE3 replies, the bearer between UE1 and UE3 is bidirectionally connected, and UE1 and UE3 transmit data of each media stream in the bearer channel. The call related signaling and bearer are removed at the end of the call.

Method Embodiment 6: Four types of multimedia call service type and/or media negotiation and call connection strong association scheme. Call scenario of this embodiment: User 1 initiates a videophone call to User 2, passing through two offices, MSC 1 and MSC 2, respectively. In this embodiment, the video service type information is used to represent the default media parameters, and only the videophone service type information is transmitted between the entities, and each entity controls the respective media processing unit to control the media according to the default media parameters according to the service type information. flow. Referring to Figure 23, the following main steps are included: 1. User 1 initiates a videophone call to User 2, and the call arrives at UE2 via MSC1 and MSC2. When UE1 initiates a call, it indicates in the SETUP message that the service type is a videophone call service. This type of service indicates to the entities along the way the media stream information to be established. For example, it is necessary to establish two bidirectional media streams, one is a voice stream, the codec is AMR, the strip is a video stream, the codec is H.263, and the resolution is 128*96. The videophone service type may be a newly defined service code, and is listed in the "speech" defined in 3GPP TS 22.003, or supplemented with the BS30 service, and the compatibility information indicates that the service is a videophone service:

2. The called terminal UE2, after receiving the call, rings and returns a ringing message to the calling party. The UE1 and the UE2 control the media processing unit to prepare the corresponding media stream according to the media stream parameters represented by the service type information shown in the first step.

3. The called UE2 replies, and the bearer between UE1 and UE2 is bidirectionally connected, and UE1 and UE2 perform data transmission of each media stream in the bearer channel. The call related signaling and bearer are removed at the end of the call.

Description 1: Media streaming mode: The media gateway on the network side can transparently transmit media streams.

Description 2: The operation of UE1 to control its media processing unit to prepare to establish a media stream may begin at the time of call initiation.

Description 3: The operation of UE2 controlling its media processing unit to prepare to establish a media stream may begin when UE2 receives a call setup request.

Note 4: The process of taking the roaming number is omitted.

Method Embodiment 7: The multimedia call service type and/or the media negotiation and the call connection are strongly associated with the scheme 5 (interworking with the old network). Call scenario of this embodiment: User 1 initiates a visible telephone call to User 2, passing through two offices, MSC 1 and MSC 2, respectively, which is an old office that does not support new videophones.

In this embodiment, the video service type information is used to represent the default media parameters, and only the videophone service type information is transmitted between the entities, and each entity controls the respective media processing list according to the service type information. The element controls the media stream by default media parameters. Referring to Figure 24, the following main steps are included:

1. User 1 initiates a multimedia call to User 2, and the call arrives at UE2 via MSC1 and MSC2. When UE1 initiates a call, it indicates in the SETUP message that the service type is a videophone call service, and the service type indicates the media stream information to be established to each entity along the way. For example, two media streams are to be created, one is a voice stream, the codec is AMR, the other is a video stream, the codec is H.263, and the resolution is 128*96.

2. After receiving the call, MSC1 finds that the next hop of the call is MSC2, which is a station that does not support the new videophone service.

3. MSC1 initiates interworking between the new network MSC1 and the old network MSC2. The embodiment is as follows: On the one hand, the old multimedia call aspect is used to initiate a call to the MSC2. On the other hand, the MSC1 presses the H.245 letter through its Mc interface with the MGW1, the bearer channel between the MGW1 and the MGW2, and the bearer channel between the MGW2 and the UE2. The method starts the negotiation of the media stream, establishes a media stream channel between the MGW1 and the UE2, and connects the channel to the corresponding media stream channel between the MGW1 and the UE1. This allows UE1 and UE2 to make video calls.

Note 1: If MSC2 and MGW2 in this embodiment are omitted, and the second step is changed to "MSC 1 finds that UE2 is an old terminal that does not support the new videophone. Specifically, UE2 does not respond when paging response. Carrying it is a message that supports a new terminal for a new videophone." It can reflect the interworking process between the new network MSC1 and the old terminal ΌΕ2.

Note 2: The process of taking the roaming number is omitted.

Note 3: In step 3, MSC1 can also wait until the other party returns to the message to start using H.245 to establish a media stream channel with the peer.

In summary, in the embodiment of the present invention, the parties participating in the multimedia call service perform media negotiation by using the call control signaling channel (out-of-band) established during the call connection, and no longer perform media through the bearer service channel (in-band). Negotiation, so the process of establishing a video conversation does not have to go through two phases of the existing solution, thus providing a condition for shortening the time to establish a video conversation. Embodiments of the present invention can complete the negotiation of the multimedia call service type and/or the media through the call control signaling channel before the bearer service channel is established, thereby shortening the time for establishing the video conversation.

Meanwhile, from the perspective of implementation, the embodiment of the present invention provides another multimedia call service class. Type and/or media negotiation methods make the negotiation method more diverse and flexible.

Further, based on the out-of-band media negotiation of the embodiment of the present invention, the MSC SERVER can also be used as a media negotiation party, or as a proxy of media negotiation parties, or as a transparent transmission network element of media negotiation parties. The call control signaling channel participates in media negotiation. Therefore, the MSC SERVER learns the establishment of the logical channel of the media stream in the process of media negotiation, and can control the MGW to manage the media stream transmitted in the logical channel of the media stream, and insert some additional functions, which are compatible with the common use in the 2G network. The business; also provides a viable basic framework for additional functions such as media component billing.

Still further, in order to balance existing terminals and networks, embodiments of the present invention also provide interworking solutions. The MSC SERVER acts as the agent of the media negotiation parties, and conducts media consultation with the parties respectively, and completes the intercommunication.

The present invention is not limited to WCDMA systems, but is also applicable to other communication systems supporting multimedia call services.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the inventions

Claims

Rights request

A method for implementing a multimedia call service, characterized in that it comprises the following steps:

A. The parties participating in the multimedia call service conduct the negotiation of the multimedia call service type and/or the body through the call control signaling channel;

B. According to the negotiation result, the establishment of the logical channel of the media stream is completed to implement the multimedia call service.

2. The method according to claim 1, wherein in the step A, the parties participating in the multimedia call service complete the negotiation before or after the bearer service channel is established.

The method according to claim 1, wherein the step A includes the following steps: when the calling party initiates a call, the calling party carries the multimedia call service type information required for negotiation in the call setup signaling. And/or media control information, sent to the called party.

The method according to claim 1, wherein in the step A, the calling party or the called party initiates the negotiation of the multimedia call service type and/or the media to the other party by using a separate negotiation message.

5. The method of claim 4, wherein the separate negotiation message is a newly defined call control signaling in a call control signaling channel.

The method of claim 4, wherein the media negotiation information is not carried in the separate negotiation message, and the multimedia call service type information carried in the separate negotiation message represents default media negotiation information.

The method according to any one of claims 1 to 6, wherein in the step A, the parties participating in the multimedia call service perform the negotiation through the call control signaling channel in an end-to-end manner.

The method according to any one of claims 1 to 6, wherein in the step A, the mobile switching center server MSC SERVER participates in the negotiation of the multimedia call service through the call control signaling channel.

9. The method according to claim 8, wherein the MSC SERVER participates in the negotiation as one of the parties to the negotiation, and the step B includes the following steps:

Bll, the MSC SERVER controls the media gateway MGW to connect in the call according to the negotiation result. Establishing a media stream logical channel with the other party in the bearer service channel established at the time;

B12. The MSG SERVER sends and/or receives a media stream on the media stream logical channel.

10. The method according to claim 8, wherein the MSC SERVER acts as a proxy for the parties to the negotiation, and the step B comprises the following steps:

B21. The MSC SERVER controls, according to the negotiation result, the MGW to establish a media stream logical channel with each party in the bearer service channel established when the call is connected;

B22. The logical channels of each part of the established media stream are adapted and connected to implement media stream interaction of the parties.

The method according to claim 8, wherein the MSC SERVER is used as a transparent transmission network element of the negotiating parties, and records the transparently transmitted multimedia call service type and/or media negotiation information; The following steps:

B31. The parties establish a media stream logical channel in the carried service channel established during the call connection according to the negotiation result, to transparently transmit the media stream through the MGW;

B32. The MSC SERVER controls the streaming media transmitted in the logical channel of the media stream according to the recorded multimedia call service type and/or the media negotiation information.

The method according to claim 8, wherein before the step A, the MSC SERVER first identifies the types of parties participating in the multimedia call service, and accordingly determines whether it supports the call control signaling channel. Said negotiation, if yes, proceed to step A;

Otherwise, the MSC SERVER performs the proxy function, and negotiates with each party according to the type of the parties involved in the multimedia call service, and performs bearer interworking.

The method according to claim 12, wherein the parties participating in the multimedia call service refer to terminals participating in the multimedia call service, or the network adjacent to the network where the MSC SERVER is located.

The method according to claim 13, wherein the parties participating in the multimedia call service refer to the terminals participating in the multimedia call service, and the MSC SERVER identifies the types of parties participating in the multimedia call service in one of the following ways:

Manner 1: When the terminal registers with the network, the terminal indicates its type to the network, and is described by MSC SERVER save;

Manner 2: The calling terminal indicates its type to the MSC SERVER through call setup signaling; the called terminal indicates its type to the MSC SERVER through call response signaling;

Manner 3: The MSC SERVER identifies the type according to the media control information carried by the signaling sent by the terminal.

Manner 4: The MSC SERVER queries the terminal for the type of the terminal.

The method according to claim 13, wherein the parties participating in the multimedia call service refer to a network adjacent to the network where the MSC SERVER is located, and the data is configured on the network where the MSC SERVER is located to indicate the proximity. The type of network.

A system for implementing a multimedia call service, comprising: an MGW that supports service data transmission, wherein the system further includes:

MSC SERVER, which supports the use of the call control signaling channel to transmit media flow control information; the parties involved in the multimedia call service, through the MSC SERVER, use the call control signaling channel to perform the multimedia call service type and/or media and body Negotiation, and realize multimedia call service through the MGW.

17. The system of claim 16, wherein the MSC SERVER is further configured to participate in the negotiating and controlling media stream transmission.

18. The system according to claim 17, wherein the air interface between the terminal and the MSC SERVER supports transmission of call setup signaling carrying media control information; or supports transmission of a newly defined separate negotiation message; Or support transmission of UUS signaling messages carrying negotiation information.

The system according to claim 17, wherein the relay signaling interface between the MSC SERVER and the other office MSC SERVER supports transmission of a multimedia call service type and/or a call setup message carrying media control information. Or; support a newly defined separate negotiation message; or support transmission of UUS signaling messages carrying negotiation information.

20. The system of claim 17, wherein the media gateway control interface between the MSC SERVER and the MGW is for communicating media flow control information.

21. The system of claim 20, wherein in the system MSC SERVER and The MGW merges, and the media gateway control interface transmits the media flow control information as an internal interface; in the system, the MSC SERVER is separated from the MGW, and the media gateway control interface transmits the media flow control information as the Mc interface.

The system according to any one of claims 16 to 21, wherein the MSC SERVER is further configured to identify whether the types of parties participating in the multimedia call service are the same, and perform multimedia according to the identification result. Negotiate the call service type and/or media and complete the interworking.

A mobile switching center server, which has the function of controlling call connection, and is characterized in that:

An air interface for transmitting information related to media flow control;

a relay signaling interface for transmitting information related to media stream control;

a media gateway control interface, configured to transmit media flow control information;

The media stream control module is configured to participate in the negotiation of the multimedia call service type and/or the media through the air interface and the relay signaling interface, and control the media stream transmission through the media gateway control interface.

The server according to claim 23, wherein the information related to media flow control comprises: call setup signaling carrying the negotiation related information, and new negotiation defined by a corresponding interface signaling specification A message, and a UUS signaling message carrying negotiation information of a multimedia call service type and/or media.

The server according to claim 23 or 24, wherein the server further comprises: an identification module, configured to identify whether the types of parties participating in the multimedia call service are the same, and make the server corresponding to each other according to the recognition result The parties negotiate and complete the interworking.

26. A terminal, comprising:

a packaging unit, configured to carry the media control information in the call setup signaling; or encapsulate the multimedia call service type and/or the media negotiation information according to the air interface signaling specification; or the multimedia call service type information and/or the media negotiation information Carry in the UUS signaling message;