CN100396113C

CN100396113C - Method for realizing concurrent voice business after inter-local-network switchover

Info

Publication number: CN100396113C
Application number: CNB2005100733658A
Authority: CN
Inventors: 蒋砾
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-05-31
Filing date: 2005-05-31
Publication date: 2008-06-18
Anticipated expiration: 2025-05-31
Also published as: CN1852461A

Abstract

The present invention discloses a method of concurrent speech business after inter-office switching. The method comprises three steps, wherein an SMSC announce a connected second MGW to establish a second endpoint, and the second MGW can send the address information of the second endpoint back to the SMSC; the SMSC can request an AMSC to take part in calling and can send the address information of the second end point to the AMSC, the AMSC can be connected with a called party according to the requirements of the SMSC and can announce a first MGW to establish a first endpoint, and meanwhile, the address information of the second endpoint can be sent to the first MGW; the first MGW can establish the coincidence relation of the first endpoint and the second endpoint and can the address information of the first endpoint to the AMSC, the AMSC can send the address information of the first endpoint back to the second MGW, and the second MGP can establish the coincidence relation between the first endpoint and the second endpoint. The present invention can realize the concurrent speech services after the inter-office switching in an IP bearing method and can increase resources utilization.

Description

The implementation method of concurrent voice business after inter-local-network switchover

Technical field

The present invention relates to the voice and packet data concurrent service in the wireless communication system, relate in particular to the concurrent voice service accomplishing method of interoffice.

Background technology

In the third generation (3G) communication system, travelling carriage can also be realized speech business when carrying out data service, this situation voice and packet data concurrent service of being known as.Particularly, the user who uses travelling carriage is carrying out that data are downloaded or during data service such as browsing page, can receive from another user's calling or calls out another user, carries out voice communication.Equally, the user utilizes the travelling carriage access network, when carrying out speech business, also can concurrent data service.In voice and packet data concurrent service, the user can at first insert data service, concurrent again speech business then; Also can at first insert speech business, concurrent again data service then.

Because travelling carriage can change by occurrence positions along with moving of user, when travelling carriage carries out in the process from (the Mobile Switch Center of a mobile switching centre in business, when MSC) scope of being administered moved to the scope that another one MSC administered, inter-office switchover had taken place in this travelling carriage.According to agreement regulation, the MSC that sets up Traffic Channel during with Mobile Origination or receipt of call at first be called initial MSC (Anchor Mobile Switch Center, AMSC); After inter-office switchover, MSC under the travelling carriage is called service MSC (Serving Mobile Switch Center, SMSC), wherein, (Visitor Location Register preserves raw informations such as the user profile of this travelling carriage and service authority in VLR) to the VLR Visitor Location Register of AMSC.As shown in Figure 1, undertaken alternately by E interface between AMSC and the SMSC, adopt time division multiplexing (Time Division Multiplexing, mode voice-bearer signal TDM) between the two.

The travelling carriage that is carrying out data service is in order to finish inter-office switchover under the unbroken situation of data service, then AMSC is when determining that travelling carriage moves in the zone that SMSC administers, at first send the inter-office switchover message call to SMSC, request SMSC accepts the inter-office switchover of this travelling carriage; The SMSC success set up Traffic Channel after, return inter-office switchover return messages as a result to AMSC again, so that this travelling carriage is proceeded data service by SMSC; Then, after the BSC under travelling carriage and the SMSC connected, SMSC is handoff completion message between the AMSC forwarding office, and this inter-office switchover that indicates this travelling carriage is finished.After data service was carried out finishing inter-office switchover in the process, the raw information of travelling carriage still was kept among the VLR of AMSC.

Data service carry out finish inter-office switchover in the process after, concurrent speech business comprises two kinds of situations: a kind of is that the calling party of the travelling carriage of inter-office switchover as speech business taken place, and another kind is that the callee of the travelling carriage of inter-office switchover as speech business taken place.In the above two kinds of cases, because the raw information of the travelling carriage that switches is arranged in the VLR of AMSC, so AMSC will participate in the flow process of concurrent speech business.

Referring to Fig. 2, the travelling carriage that inter-office switchover takes place is during as the calling party, and the method for existing concurrent speech business may further comprise the steps:

After step 201.SMSC sends the caller request of concurrent speech business at travelling carriage, carry user ID (Mobile Station ID to the AMSC transmission, MSID), the business interpolation of called number and interoffice circuit identifier (InterMSCCircuitID) is called (ADDSERV) message, the calling procedure that request AMSC initiates concurrent speech business.

In this step, after travelling carriage sends to SMSC by BSC with the caller request of concurrent speech business, SMSC with the identification information of this travelling carriage as MSID, this called out selected interexchange circuit information identify as interexchange circuit, be carried in the ADDSERV message together with called number, send to AMSC.

Step 202.AMSC is according to the received ADDSERV message callee that continues, and returns the professional result of interpolation to SMSC and return (addserv) message, indicates the call setup success.

In this step, AMSC at first extracts called number from the ADDSERV message that receives, and finds the affiliated MSC of this callee, and realization continues to this callee's, impels callee's travelling carriage ring; And AMSC returns addserv message to SMSC, and the setup requests that indicates in the ADDSERV message is accepted by AMSC, and has carried out continuing of callee.

By above-mentioned two steps, calling party that inter-office switchover takes place and the voice transfer channel between the callee have been set up, so that after this calling party and callee can realize voice call.

In the network operation process of reality, the travelling carriage that inter-office switchover takes place also can be used as the callee of concurrent speech business.As shown in Figure 3, the travelling carriage that inter-office switchover takes place is during as the callee, and the method for existing concurrent speech business may further comprise the steps:

Step 301.AMSC sends the inter-system call foundation that carries MSID and interoffice circuit identifier to SMSC and calls (ISSETUP) message, the called flow that request SMSC initiates concurrent speech business.

When AMSC found travelling carriage in the network or landline telephone as the travelling carriage of caller calls generation inter-office switchover, the SMSC under the callee sent ISSETUP message in this step.Carried callee's user totem information in the MSID cell in this message, carried this in the interexchange circuit sign cell and called out the required circuit information that takies.

Step 302.SMSC call setup result between the AMSC retrieval system returns (issetup) message, indicates the result of call setup.

In this step, SMSC extracts the MSID cell from the ISSETUP message that receives, and pairing called subscriber distributes air traffic channel at this MSID cell, impels callee's travelling carriage to begin ring; And SMSC returns issetup message to AMSC.

Step 303.SMSC replys between the AMSC transmitting system and calls (ISANSWER) message after knowing that by BSC the callee replys, and indicates the callee and has accepted this audio call.

Step 304.AMSC response result between the SMSC retrieval system is returned (isanswer) message, indicates and has received ISANSWER message.

By above-mentioned four steps, set up the calling party and voice transfer channel between the callee of inter-office switchover has taken place, so that after this calling party and callee can realize voice call.

More than be that interoffice switches the detailed process of the concurrent speech business in back when adopting the TDM bearing mode between AMSC and the SMSC.Though said process is comparatively simple, lacks and have following shortcoming:

1. under the TDM bearing mode, physical channel is divided according to time slot, used for different callings.If not needing in the process to carry out the voice signal that transmits and call out, for example calling party and callee all keep silence, and also will take this calling time slot corresponding at this moment, and the utilance of transfer resource is lower;

2. because the air interface part is different with the coded format of TDM bearing part, be that voice signal form between travelling carriage and the BSC is different with the voice signal form between AMSC and the SMSC, then must realize the conversion of above-mentioned voice signal form by codec, therefore increase the time delay and the quality of speech signal loss of speech business.

At present, a kind of new bearing mode has appearred between AMSC and SMSC---Internet protocol (Internet Protocol, IP) bearing mode.Under this mode, not needing in the process to carry out the voice signal that transmits then occupied bandwidth not if call out, and the identical coded format of voice signal form employing between the voice signal form between travelling carriage and the BSC and AMSC and the SMSC.

Though the IP bearing mode can overcome the shortcoming of TDM bearing mode, owing to do not stipulate the concrete grammar of concurrent voice business after inter-local-network switchover under the IP bearing mode in the agreement, and can't make full use of the plurality of advantages of IP carrying.

Summary of the invention

In view of this, the object of the present invention is to provide the implementation method of concurrent voice business after inter-local-network switchover under the IP bearing mode.

For achieving the above object, the invention provides the implementation method of concurrent voice business after inter-local-network switchover under the IP bearing mode, this method may further comprise the steps:

A1. after serving mobile switching center SMSC receives the caller request of the concurrent speech business that comes from the travelling carriage that inter-office switchover takes place, second media gateway MGW that the SMSC notice links to each other with self is called out for this and is created second end points, and the 2nd MGW returns to SMSC with the address information of second end points;

The B1.SMSC request initial movable AMSC of switching center participates in this calling, and the address information of second end points sent to described AMSC, AMSC is according to the request of the SMSC callee that continues, and the MGW that links to each other with this AMSC of notice is this calling establishment first end points, and the address information with second end points sends to a MGW simultaneously;

C1. a MGW is according to the address information of second end points that receives, set up the corresponding relation of first end points and second end points, and the address information of first end points sent to AMSC, AMSC returns to the 2nd MGW by the first end-point addresses information that SMSC will receive again, the 2nd MGW is according to the address information of first end points that receives, set up the corresponding relation between first end points and second end points, the voice transfer passage that the switching interoffice of inter-office switchover then takes place is set up successfully;

Described address information comprises Internet protocol IP address and port numbers at least.

Wherein, steps A 1 described SMSC notifies second media gateway MGW that links to each other with this SMSC for this step of calling out establishment second end points to be:

SMSC sends to the 2nd MGW increases end-points request ADD message;

Steps A 1 described the 2nd MGW with the step that the address information of second end points returns to SMSC is:

The 2nd MGW sends the increase end points response ADDReply message of the second end-point addresses information that carries to SMSC.

Wherein, the virtual circuit sign of this calling is set, then the described SMSC request of step B1 AMSC participates in this step in calling out and is:

SMSC calls ADDSERV message to the business interpolation that AMSC sends the user totem information, called number and the virtual circuit sign that carry this travelling carriage;

The step that the described address information with second end points of step B1 sends to AMSC is:

SMSC sends to AMSC and invites INVITE, and carries the second end-point addresses information and the virtual circuit sign identical with described ADDSERV message in this message;

The step that the first end-point addresses information that the described AMSC of step C1 will receive by SMSC returns to the 2nd MGW is:

AMSC sends the 200_OK message that carries the described first end-point addresses information to SMSC; SMSC parses the address information of first end points again from the 200_OK message that receives, send to the 2nd MGW by endpoint parameter update request MODIFY message.

Wherein, the described AMSC of step B1 continues according to the request of SMSC after the callee, and this method further comprises:

AMSC returns the professional result of interpolation to SMSC and returns addserv message, indicates AMSC and has accepted this calling, and carried out continuing of callee.

Wherein, described AMSC is after SMSC sends 200_OK message, and this method further comprises:

SMSC returns to AMSC and confirms ACK message, indicates SMSC and has received the 200_OK message that comes from AMSC.

Wherein, the described SMSC of step B1 request AMSC participates in during this calls out, and with the step that the address information of second end points sends to the AMSC at this travelling carriage place is:

SMSC sends the ADDSERV message of the user totem information, called number and the second end-point addresses information that carry this travelling carriage to AMSC;

AMSC is carried on the address information of described first end points in the addserv message, sends to SMSC; SMSC parses the address information of first end points again from the addserv message that receives, send to the 2nd MGW by MODIFY message.

Wherein, the MGW that the described notice of step B1 links to each other with this AMSC is that this is called out and creates first end points, and the step that simultaneously address information of second end points is sent to a MGW is:

The address information of second end points that AMSC will get access to is put into ADD message, sends to a MGW;

The step that the described address information with first end points of step C1 returns to AMSC is:

The one MGW is carried on the address information of first end points in the increase end points response ADD Reply message, sends to AMSC.

Wherein, described MODIFY message sends to after the 2nd MGW, and this method further comprises:

The 2nd MGW sends end points parameter update response MODIFY Reply message to SMSC, indicates to set up successfully being connected between a MGW and the 2nd MGW.

A kind of method of concurrent voice business after inter-local-network switchover, wherein, this method may further comprise the steps:

A2. after arriving AMSC from the call request of calling party's concurrent speech business, the MGW that the AMSC notice links to each other with self is this calling establishment first end points, and a MGW returns to AMSC with the address information of first end points;

B2.AMSC request SMSC participates in this calling, and the address information of first end points is sent to the SMSC at this travelling carriage place, SMSC is according to the request of the AMSC callee that continues, and the 2nd MGW that links to each other with this SMSC of notice is this calling establishment second end points, and the address information with first end points sends to the 2nd MGW simultaneously;

C2. the 2nd MGW is according to the address information of first end points that receives, set up the corresponding relation of first end points and second end points, and the address information of second end points sent to SMSC, SMSC returns to a MGW by the second end-point addresses information that AMSC will receive again, the one MGW is according to the address information of second end points that receives, set up the corresponding relation between first end points and second end points, the voice transfer passage that the switching interoffice of inter-office switchover then takes place is set up successfully;

Wherein, steps A 2 described AMSC notify a MGW who links to each other with self for this step of calling out establishment first end points to be:

AMSC sends ADD message to a MGW;

Steps A 2 described MGW with the step that the address information of first end points returns to AMSC are:

The one MGW sends the ADD Reply message of the first end-point addresses information that carries to AMSC.

Wherein, the virtual circuit sign of this calling is set, then the described AMSC request of step B2 SMSC participates in this step in calling out and is:

The inter-system call that AMSC sends the user totem information carry this travelling carriage and virtual circuit sign to SMSC is set up and is called ISSETUP message;

The step that the described address information with first end points of step B2 sends to SMSC is:

AMSC sends INVITE to SMSC, and carries the first end-point addresses information and the virtual circuit sign identical with described ISSETUP message in this INVITE;

The step that the second end-point addresses information that the described SMSC of step C2 will receive by AMSC returns to a MGW is:

SMSC sends the 200_OK message that carries the described second end-point addresses information to AMSC; AMSC parses the address information of second end points again from the 200_OK message that receives, send to a MGW by MODIFY message.

Wherein, the described SMSC of step B2 continues according to the request of AMSC after the callee, and this method further comprises:

SMSC call setup result between the AMSC retrieval system returns issetup message, indicates SMSC and has accepted this calling, and carried out continuing of callee.

Wherein, described SMSC is after AMSC sends 200_OK message, and this method further comprises:

AMSC returns ACK message to SMSC, indicates AMSC and has received the 200_OK message that comes from SMSC.

Wherein, the described AMSC of step B2 request SMSC participates in during this calls out, and with the step that the address information of first end points sends to SMSC is:

AMSC sends to SMSC and carries the user totem information of this travelling carriage and the ISSETUP message of the first end-point addresses information;

SMSC is carried on the address information of described second end points in the issetup message, sends to AMSC; AMSC parses the address information of second end points again from the issetup message that receives, send to a MGW by MODIFY message.

Wherein, the 2nd MGW that the described notice of step B2 links to each other with this SMSC is that this is called out and creates second end points, and the step that simultaneously address information of first end points is sent to the 2nd MGW is:

The address information of first end points that SMSC will get access to is put into ADD message, sends to the 2nd MGW;

The step that the described address information with second end points of step C2 returns to SMSC is:

The 2nd MGW is carried on the address information of second end points in the ADD Reply message, sends to SMSC.

Wherein, described MODIFY message sends to after the MGW, and this method further comprises:

The one MGW sends MODIFY Reply message to AMSC, indicates to set up successfully being connected between a MGW and the 2nd MGW.

Wherein, after the described step C2, this method further comprises:

SMSC indicates this travelling carriage to AMSC and has accepted this calling after knowing that by BSC described travelling carriage is replied.

Wherein, describedly indicate this travelling carriage to AMSC and accepted the measured step of this calling and be suddenly:

SMSC replys between the AMSC transmitting system and calls ISANSWER message.

Wherein, described SMSC is after AMSC sends ISANSWER message, and this method further comprises:

AMSC returns to SMSC and shows that response result is returned isanswer message between the system that described ISANSWER message has been successfully received.

A kind of communication system, this system comprises: serving mobile switching center SMSC, the AMSC of initial movable switching center, first media gateway MGW and the 2nd MGW, wherein, after SMSC receives the caller request of the concurrent speech business that comes from the travelling carriage that inter-office switchover takes place, the 2nd MGW that the SMSC notice links to each other with self calls out for this and creates second end points, and the 2nd MGW returns to SMSC with the address information of second end points;

SMSC request AMSC participates in this calling, and the address information of second end points sent to described AMSC, AMSC is according to the request of the SMSC callee that continues, and the MGW that links to each other with this AMSC of notice is this calling establishment first end points, and the address information with second end points sends to a MGW simultaneously;

The one MGW is according to the address information of second end points that receives, set up the corresponding relation of first end points and second end points, and the address information of first end points sent to AMSC, AMSC returns to the 2nd MGW by the first end-point addresses information that SMSC will receive again, the 2nd MGW is according to the address information of first end points that receives, set up the corresponding relation between first end points and second end points, the voice transfer passage that the switching interoffice of inter-office switchover then takes place is set up successfully;

A kind of communication system, this system comprises: serving mobile switching center SMSC, the AMSC of initial movable switching center, first media gateway MGW and the 2nd MGW, wherein, after the call request of AMSC reception from calling party's concurrent speech business, the MGW that the AMSC notice links to each other with self calls out for this and creates first end points, and a MGW returns to AMSC with the address information of first end points;

AMSC request SMSC participates in this calling, and the address information of first end points is sent to the SMSC at this travelling carriage place, SMSC is according to the request of the AMSC callee that continues, and the 2nd MGW that links to each other with this SMSC of notice is this calling establishment second end points, and the address information with first end points sends to the 2nd MGW simultaneously;

The 2nd MGW is according to the address information of first end points that receives, set up the corresponding relation of first end points and second end points, and the address information of second end points sent to SMSC, SMSC returns to a MGW by the second end-point addresses information that AMSC will receive again, the one MGW is according to the address information of second end points that receives, set up the corresponding relation between first end points and second end points, the voice transfer passage that the switching interoffice of inter-office switchover then takes place is set up successfully;

Use the present invention, can under the IP bearing mode, realize concurrent voice business after inter-local-network switchover.Particularly, the present invention has following beneficial effect:

1. the present invention is respectively that this is called out and creates end points 1 and end points 2 in MGW1 that links to each other with SMSC with AMSC and MGW2, and by IP address and port numbers, two end points are coupled together, so that in the process of concurrent speech business, therefore transmission of speech signals on the Media Stream path between the two-end-point can realize concurrent voice business after inter-local-network switchover under the IP bearing mode.

2. because the present invention can realize concurrent voice business after inter-local-network switchover under the IP bearing mode, therefore can utilize the advantage of IP bearing mode fully, that is: when not having voice signal in the voice call process, occupied bandwidth not then, and therefore this part bandwidth can improve the utilance of transfer resource for other professional use; In addition, because identical code encoding/decoding mode can partly be adopted with air interface in the IP bearing part, need not to adopt any decoder to come the switching signal form, then all can both avoid because propagation delay time that the introducing of decoder brings and quality of speech signal lose in the transmission courses end to end.

Description of drawings

The network structure of inter-office switchover for taking place in Fig. 1;

After Fig. 2 is existing inter-office switchover, the caller signaling process figure of concurrent speech business;

After Fig. 3 is existing inter-office switchover, the called signaling process figure of concurrent speech business;

Fig. 4 is the caller signaling process figure of concurrent voice business after inter-local-network switchover in the embodiment of the invention 1;

Fig. 5 is the called signaling process figure of concurrent voice business after inter-local-network switchover in the embodiment of the invention 1;

Fig. 6 is the caller signaling process figure of concurrent voice business after inter-local-network switchover in the embodiment of the invention 2;

Fig. 7 is the called signaling process figure of concurrent voice business after inter-local-network switchover in the embodiment of the invention 2.

Embodiment

For making purpose of the present invention, technical scheme clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.

Because what the IP bearing mode adopted is to connect end to end, and AMSC and SMSC are connected with media gateway (Media Gateway respectively, MGW) 1 and MGW2, therefore when carrying out concurrent voice business after inter-local-network switchover of the present invention, MGW1 and MGW2 are respectively under the indication of AMSC and SMSC, create the end points that transmits this voice calls signal at self, and between the end points of being created, connect, so that realize calling party and callee's voice communication.

The present invention can with meet conversation initialized protocol (Session Initiation Protocol, message SIP) combines with the message of existing concurrent speech business, sets up the IP carrying between AMSC and the SMSC, and then realizes concurrent speech business; Also can improve, set up the IP carrying between AMSC and the SMSC, and then realize concurrent speech business existing concurrent speech business message.The method of concurrent voice business after inter-local-network switchover of the present invention is described below by two embodiment.

Embodiment 1: in conjunction with the concurrent speech business under the sip message realization IP bearing mode.

As shown in Figure 4, the travelling carriage that inter-office switchover takes place is during as the calling party, and the method for the concurrent speech business of present embodiment may further comprise the steps:

After step 401～402. travelling carriages sent to SMSC by BSC with the caller request of concurrent speech business, SMSC sends to MGW2 increased end-points request (ADD) message, and request MGW2 creates the end points 2 of this calling; After MGW2 finishes the establishment of end points 2, by increasing end points response (ADD Reply) message, Endpoint ID (TID), IP address and the port numbers of end points 2 sent to SMSC.

Step 403～404.SMSC sends the ADDSERV message carry MSID, called number and interoffice circuit identifier to AMSC, the calling procedure that request AMSC initiates concurrent speech business, and AMSC is according to the ADDSERV message that the receives callee that continues; And SMSC invites AMSC to participate in this calling, and the IP address and the port numbers of end points 2 is sent to AMSC by sending invitation (INVITE) message that is associated with this ADDSERV message to AMSC.

Under the IP bearing mode, pass through IP address and port numbers transmitting grouped data message between AMSC and the SMSC, and need not to set up the TDM circuit, then the interexchange circuit in message sign need not to carry this and calls out the required circuit information that takies between AMSC and the SMSC as the TDM bearing mode, but carries the concrete numerical value of the virtual circuit sign (vCIC) that SMSC distributes for this calling.

For two steps at this place, SMSC know the MGW2 success that is connected with self establishment behind the end points 2, with the identification information of travelling carriage as MSID, the vCIC of this calling is identified as interexchange circuit, be carried in the ADDSERV message together with called number, send to AMSC.After AMSC receives ADDSERV message, from the MSID of this message, extract called number, find the affiliated MSC of this callee, realize continuing this callee.

And in order to make AMSC obtain the IP address and the port numbers of end points 2, then (Sessiondescription protocol SDP), sends to AMSC to SMSC as the Session Description Protocol of INVITE with the IP address of end points 2 and port numbers.In addition, be associated with ADDSERV message in order to show the INVITE that sends at this place, SMSC also is consistent vCIC cell in the INVITE and the sign of the interexchange circuit in the ADDSERV message.

Step 405～406.AMSC sends to the MGW1 that links to each other with self and carries the IP address of end points 2 and the ADD message of port numbers, and request MGW1 creates the end points 1 of this calling; After MGW1 finishes the establishment of end points 1, set up the corresponding relation of end points 1 and end points 2, and by ADD Reply message, TID, IP address and the port numbers of end points 1 sent to AMSC.

AMSC puts into ADD message with the IP address and the port numbers of the end points 2 that carries in the INVITE herein, sends to MGW1.MGW1 is from as this call setup end points 1, and it is the IP address and the port numbers of the end points 2 in the IP address of this end points 1 and port numbers and the ADD message is corresponding, so that end points 1 can send sound signal stream to end points 2 in calling party and callee's communication process.Then, MGW1 sends the ADD Reply message of the TID, IP address and the port numbers that carry end points 1 again to AMSC, as the response of ADD message.

Step 407～408.AMSC returns addserv message to SMSC, indicates AMSC and has accepted this calling, and carried out continuing of callee; And AMSC is by 200OK message, and the IP address and the port numbers of end points 1 sent to SMSC.

Step 409～410.SMSC sends to MGW2 and carries the IP address of end points 1 and endpoint parameter update request (MODIFY) message of port numbers; MGW2 is according to the IP address and the port numbers of the end points 1 that receives, set up the corresponding relation between end points 1 and the end points 2 after, return the end points parameter update to SMSC and respond (MODIFY Reply) message, indicate and set up successfully being connected between MGW1 and the MGW2.

The IP address and the port numbers of the SMSC end points 1 that will parse from 200_OK message are put in the MODIFY message herein, send to the MGW2 that links to each other with this SMSC; Then, MGW2 is corresponding with the IP address and the port numbers of end points 2 with port numbers with the IP address of the end points 1 that receives, so that end points 2 can send sound signal stream to end points 1 in calling party and callee's communication process.Then, MGW2 returns the MODIFY Reply message that shows that end points 1 and end points 2 successfully have been connected to SMSC again.

Step 411.SMSC returns affirmation (ACK) message to AMSC, indicates the 200_OK message that has received from AMSC.

The ACK message of this step only needs to send after SMSC receives 200_OK message, does not promptly have definite time sequencing between this message and the step 409,410.

So far, set up the calling party of inter-office switchover and the voice transfer passage between the callee have taken place, can utilize the voice transfer passage of having set up to realize voice call between the calling party of this concurrent speech business after this and the callee.

Similar to above-mentioned flow process, when the travelling carriage that inter-office switchover takes place during, also realize the transmission of end points IP address and port numbers between AMSC and the SMSC by the message that meets Session Initiation Protocol as the callee.

As shown in Figure 5, the travelling carriage that inter-office switchover takes place is during as the callee, and the method for the concurrent speech business of present embodiment may further comprise the steps:

When step 501～502.AMSC was found travelling carriage in the network or landline telephone as the travelling carriage of caller calls generation inter-office switchover, AMSC sent ADD message to the MGW1 that is connected with self, asks MGW1 to create the end points 1 of this calling; After MGW1 finishes the establishment of end points 1,, TID, IP address and the port numbers of end points 1 sent to AMSC by ADD Reply message.

Step 503～504.AMSC sends the ISSETUP message that carries MSID and interoffice circuit identifier to SMSC, the called flow that request SMSC initiates concurrent speech business, and SMSC is according to the ISSETUP message call callee who receives; AMSC invites SMSC to participate in this calling, and the IP address and the port numbers of end points 1 is sent to SMSC by sending the INVITE that is associated with this ISSETUP message to SMSC.

Carried callee's user totem information herein in the MSID cell of ISSETUP message, carried this in the interexchange circuit sign cell and called out vCIC.After SMSC receives ISSETUP message, from this message, extract the MSID cell, and distribute air traffic channel, impel callee's travelling carriage to begin ring at this called subscriber.

And in order to make SMSC obtain the IP address and the port numbers of end points 1, then AMSC as the SDP in the INVITE, sends to SMSC with the IP address of end points 1 and port numbers.In addition, be associated with ISSETUP message in order to show the INVITE that sends at this place, SMSC also is consistent the content of vCIC cell in the INVITE and the sign of the interexchange circuit in the ISSETUP message.

Step 505～506.SMSC sends to the MGW2 that links to each other with self and carries the IP address of end points 1 and the ADD message of port numbers, and request MGW2 creates the end points 2 of this calling; After MGW2 finishes the establishment of end points 2, set up the corresponding relation between end points 1 and the end points 2, and by ADDReply message, TID, IP address and the port numbers of end points 2 sent to SMSC.

The IP address and the port numbers of the SMSC end points 1 that will parse from the INVITE that receives are carried in the ADD message herein, send to MGW2.MGW2 is from as this call setup end points 2, and it is the IP address and the port numbers of the end points 1 in the IP address of this end points 2 and port numbers and the ADD message is corresponding, so that end points 2 can send sound signal stream to end points 1 in calling party and callee's communication process.Then, MGW2 sends the ADD Reply message of the TID, IP address and the port numbers that carry end points 2 again to SMSC, as the response of ADD message.

Step 507.SMSC returns issetup message to AMSC, indicates SMSC and has accepted this calling.

Step 508.SMSC is by 200_OK message, and the IP address and the port numbers of end points 1 sent to AMSC.

For end points 1 and end points 2 can connect in subsequent step, SMSC sends to AMSC by 200_OK message with the IP address and the port numbers of end points 2 in this step.

Step 509～510.AMSC sends to the MGW1 that is connected with self and carries the IP address of end points 2 and the MODIFY message of port numbers; MGW1 is according to the IP address and the port numbers of the end points 2 that receives, set up the corresponding relation between end points 1 and the end points 2 after, return MODIFY Reply message to AMSC, indicate and set up successfully being connected between MGW1 and the MGW2.

The IP address and the port numbers of the AMSC end points 2 that will parse from 200_OK message are put in the MODIFY message herein, send to the MGW1 that links to each other with this AMSC; Then, MGW1 is corresponding with the IP address and the port numbers of end points 1 with port numbers with the IP address of the end points 2 that receives, so that end points 1 can send sound signal stream to end points 2 in calling party and callee's communication process.Then, MGW1 returns the MODIFY Reply message that shows that end points 1 and end points 2 successfully have been connected to SMSC again.

Step 511.AMSC returns ACK message to SMSC, the 200_OK message that indicated the successful reception of AMSC.

The ACK message of this step only needs to send after 200_OK message, does not promptly have definite time sequencing between this message and the

step

509 and 510.

After step 512～513.SMSC knows that by BSC the callee replys, send ISANSWER message, indicate the callee and accepted this audio call to AMSC; AMSC returns the isanswer message that shows that ISANSWER message has been successfully received to SMSC again.

So far, set up the calling party and voice transfer passage between the callee of inter-office switchover has taken place, can utilize the voice transfer passage realization voice call of having set up between the calling party of this concurrent speech business after this and the callee.

Above method combines with the message of existing concurrent speech business for the message that will meet Session Initiation Protocol, sets up the IP carrying between AMSC and the SMSC, describes below by existing concurrent speech business is improved the method for setting up the IP carrying.

Embodiment 2: existing message is improved the concurrent speech business that realizes under the IP bearing mode.

Present embodiment increases the SDP cell in existing ADDSERV message, addserv message, ISSETUP message and issetup message, be used to transmit the IP address and the port numbers of calling out the end points of being set up for this.

As shown in Figure 6, the travelling carriage that inter-office switchover takes place is during as the calling party, and the method for the concurrent speech business of present embodiment may further comprise the steps:

Step 601～602. are after travelling carriage sends to SMSC by BSC with the caller request of concurrent speech business, and SMSC sends ADD message to MGW2, and request MGW2 creates the end points 2 of this calling; After MGW2 finishes the establishment of end points 2,, TID, IP address and the port numbers of end points 2 sent to SMSC by ADD Reply message.

Step 603.SMSC sends ADDSERV message to AMSC, the calling procedure that request AMSC initiates concurrent speech business, carry MSID, called number in this message and preserve the IP address of end points 2 and the SDP cell of port numbers, AMSC is according to the ADDSERV message that the receives callee that continues.

SMSC know the MGW2 success that is connected with self establishment behind the end points 2, with the identification information of travelling carriage as MSID, with the IP address of end points 2 and port numbers as the SDP cell, be carried in the ADDSERV message together with called number, send to AMSC.After AMSC receives ADDSERV message, from the MSID of this message, extract called number, find the affiliated MSC of this callee, realize continuing this callee.

Step 604～605.AMSC sends to the MGW1 that links to each other with self and carries the IP address of end points 2 and the ADD message of port numbers, and request MGW1 creates the end points 1 of this calling; After MGW1 finishes the establishment of end points 1, set up the corresponding relation of end points 1 and end points 2, and by ADD Reply message, TID, IP address and the port numbers of end points 1 sent to AMSC.

AMSC puts into ADD message with the IP address and the port numbers of the end points 2 that carries in the ADDSERV message herein, sends to MGW1.MGW1 is from as this call setup end points 1, and it is the IP address and the port numbers of the end points 2 in the IP address of this end points 1 and port numbers and the ADD message is corresponding, so that end points 1 can send sound signal stream to end points 2 in calling party and callee's communication process.Then, MGW1 sends the ADD Reply message of the TID, IP address and the port numbers that carry end points 1 again to AMSC, as the response of ADD message.

Step 606.AMSC returns addserv message to SMSC, indicates AMSC and has accepted this calling, and carried out continuing of callee; And, the IP address and the port numbers of end points 1 sent to SMSC by the SDP cell in this addserv message.

AMSC is accepted by AMSC to the setup requests that SMSC indicates in the ADDSERV message by addserv message herein; Simultaneously, SMSC sends the IP address and the port numbers of end points 1 to AMSC by this addserv message.

Step 607～608.SMSC sends to MGW2 and carries the IP address of end points 1 and the MODIFY message of port numbers; MGW2 is according to the IP address and the port numbers of the end points 1 that receives, set up being connected between end points 1 and the end points 2 after, return the end points parameter update to SMSC and respond MODIFY Reply message, indicate and set up successfully being connected between MGW1 and the MGW2.

The IP address and the port numbers of the SMSC end points 1 that will parse from addserv message are put in the MODIFY message herein, send to the MGW2 that links to each other with this SMSC; Then, MGW2 is corresponding with the IP address and the port numbers of end points 2 with port numbers with the IP address of the end points 1 that receives, so that end points 2 can send sound signal stream to end points 1 in calling party and callee's communication process.Then, MGW2 returns the MODIFY Reply message that shows that end points 1 and end points 2 successfully have been connected to SMSC again.

Similar to above-mentioned flow process, when the travelling carriage that inter-office switchover takes place during as the callee, the also transmission by existing concurrent speech business message realization end points IP address and port numbers between AMSC and the SMSC.

As shown in Figure 7, the travelling carriage that inter-office switchover takes place is during as the callee, and the method for the concurrent speech business of present embodiment may further comprise the steps:

When step 701～702.AMSC was found travelling carriage in the network or landline telephone as the travelling carriage of caller calls generation inter-office switchover, AMSC sent ADD message to the MGW1 that is connected with self, asks MGW1 to create the end points 1 of this calling; After MGW1 finishes the establishment of end points 1,, TID, IP address and the port numbers of end points 1 sent to AMSC by ADD Reply message.

Step 703.AMSC sends ISSETUP message to SMSC, the called flow that request SMSC initiates concurrent speech business, carry MSID in this message and preserve the IP address of end points 1 and the SDP cell of port numbers, SMSC is according to the ISSETUP message call callee who receives.

Carried callee's user totem information herein in the MSID cell of ISSETUP message, then SMSC at first parses the MSID cell from the ISSETUP message that receives, and obtains called number wherein.Then, SMSC distributes air traffic channel at the pairing called subscriber of this called number, and impels callee's travelling carriage ring.

Step 704～705.SMSC sends to the MGW2 that links to each other with self and carries the IP address of end points 1 and the ADD message of port numbers, and request MGW2 creates the end points 2 of this calling; After MGW2 finishes the establishment of end points 2, set up the corresponding relation between end points 1 and the end points 2, and by ADDReply message, TID, IP address and the port numbers of end points 2 sent to SMSC.

SMSC parses the SDP cell from the ISSETUP message that receives herein, obtain wherein called number and the IP address and the port numbers of end points 1.Then, SMSC is carried on the IP address and the port numbers of the end points 1 that gets access in the ADD message, sends to MGW2.MGW2 is from as this call setup end points 2, and it is the IP address and the port numbers of the end points 1 in the IP address of this end points 2 and port numbers and the ADD message is corresponding, so that end points 2 can send sound signal stream to end points 1 in calling party and callee's communication process.Then, MGW2 sends the ADD Reply message of the TID, IP address and the port numbers that carry end points 2 again to SMSC, as the response of ADD message.

Step 706.SMSC returns issetup message to AMSC, indicates the result of call setup, and with the IP address of end points 2 and port numbers as the SDP cell of this issetup message, send to AMSC.

In this step, SMSC as the SDP cell, is carried on the IP address of the end points 2 that receives and port numbers in the issetup message, sends to AMSC, and indicates the request that this SMSC has accepted to participate in this calling.

Step 707～708.AMSC sends to the MGW1 that is connected with self and carries the IP address of end points 2 and the MODIFY message of port numbers; MGW1 is according to the IP address and the port numbers of the end points 2 that receives, set up the Media Stream connecting path between self and the MGW2 after, return MODIFYReply message to AMSC, indicate and set up successfully being connected between MGW1 and the MGW2.

The IP address and the port numbers of the AMSC end points 1 that will parse from issetup message are put in the MODIFY message herein, send to the MGW1 that links to each other with this AMSC; Then, MGW1 is corresponding with the IP address and the port numbers of end points 1 with port numbers with the IP address of the end points 2 that receives, so that end points 1 can send sound signal stream to end points 2 in calling party and callee's communication process.Then, MGW1 returns the MODIFY Reply message that shows that end points 1 and end points 2 successfully have been connected to SMSC again.

After step 709～710.SMSC knows that by BSC the callee replys, send ISANSWER message, indicate the callee and accepted this audio call to AMSC; AMSC returns the isanswer message that shows that ISANSWER message has been successfully received to SMSC again.

The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. the method for a concurrent voice business after inter-local-network switchover is characterized in that, this method may further comprise the steps:

2. the method for claim 1 is characterized in that, second media gateway MGW that steps A 1 described SMSC notice links to each other with this SMSC is called out the step of creating second end points for this and is:

SMSC sends to the 2nd MGW increases end-points request ADD message;

3. the method for claim 1 is characterized in that, the virtual circuit sign of this calling is set, and then the described SMSC request of step B1 AMSC participates in this step in calling out and is:

4. method as claimed in claim 3 is characterized in that, the described AMSC of step B1 continues according to the request of SMSC after the callee, and this method further comprises:

5. as claim 3 or 4 described methods, it is characterized in that described AMSC is after SMSC sends 200_OK message, this method further comprises:

6. the method for claim 1 is characterized in that, the described SMSC of step B1 request AMSC participates in during this calls out, and with the step that the address information of second end points sends to the AMSC at this travelling carriage place is:

7. as claim 1,3 or 6 described methods, it is characterized in that the MGW that the described notice of step B1 links to each other with this AMSC is that this is called out and creates first end points, the step that simultaneously address information of second end points is sent to a MGW is:

8. as claim 3 or 6 described methods, it is characterized in that described MODIFY message sends to after the 2nd MGW, this method further comprises:

9. the method for a concurrent voice business after inter-local-network switchover is characterized in that, this method may further comprise the steps:

After the call request of A2.AMSC reception from calling party's concurrent speech business, the MGW that the AMSC notice links to each other with self is that this calls out establishment first end points, and a MGW returns to AMSC with the address information of first end points;

10. method as claimed in claim 9 is characterized in that, the MGW that steps A 2 described AMSC notices link to each other with self calls out the step of creating first end points for this and is:

AMSC sends ADD message to a MGW;

11. method as claimed in claim 9 is characterized in that, the virtual circuit sign of this calling is set, then the described AMSC request of step B2 SMSC participates in this step in calling out and is:

12. method as claimed in claim 11 is characterized in that, the described SMSC of step B2 continues according to the request of AMSC after the callee, and this method further comprises:

13., it is characterized in that described SMSC is after AMSC sends 200_OK message as claim 11 or 12 described methods, this method further comprises:

14. method as claimed in claim 9 is characterized in that, the described AMSC of step B2 request SMSC participates in during this calls out, and with the step that the address information of first end points sends to SMSC is:

15., it is characterized in that the 2nd MGW that the described notice of step B2 links to each other with this SMSC is that this is called out and creates second end points as claim 9,11 or 14 described methods, the step that simultaneously address information of first end points is sent to the 2nd MGW is:

16., it is characterized in that described MODIFY message sends to after the MGW as claim 11 or 14 described methods, this method further comprises:

17. method as claimed in claim 9 is characterized in that, after the described step C2, this method further comprises:

18. method as claimed in claim 17 is characterized in that, describedly indicates this travelling carriage to AMSC and has accepted the measured step of this calling and be suddenly:

SMSC replys between the AMSC transmitting system and calls ISANSWER message.

19. method as claimed in claim 18 is characterized in that, described SMSC is after AMSC sends ISANSWER message, and this method further comprises:

20. a communication system is characterized in that, this system comprises: serving mobile switching center SMSC, the AMSC of initial movable switching center, first media gateway MGW and the 2nd MGW, wherein,

After SMSC received the caller request of the concurrent speech business that comes from the travelling carriage that inter-office switchover takes place, the 2nd MGW that the SMSC notice links to each other with self called out for this and creates second end points, and the 2nd MGW returns to SMSC with the address information of second end points;

21. communication system as claimed in claim 20 is characterized in that, the 2nd MGW that described SMSC notice links to each other with this SMSC calls out establishment second end points for this and is specially:

SMSC sends to the 2nd MGW increases end-points request ADD message;

Described the 2nd MGW returns to SMSC with the address information of second end points and is specially:

22. communication system as claimed in claim 20 is characterized in that, the virtual circuit sign of this calling is set, described SMSC request AMSC participates in this calling and is specially:

Described address information with second end points sends to AMSC and is specially:

The first end-point addresses information that described AMSC will receive by SMSC returns to the 2nd MGW and is specially:

23. communication system as claimed in claim 22, it is characterized in that described AMSC continues according to the request of SMSC after the callee, AMSC returns the professional result of interpolation to SMSC and returns addserv message, indicate AMSC and accepted this calling, and carried out continuing of callee.

24., it is characterized in that described AMSC is after SMSC sends 200_OK message as claim 22 or 23 described communication systems, SMSC returns to AMSC and confirms ACK message, indicates SMSC and has received the 200_OK message that comes from AMSC.

25. communication system as claimed in claim 20 is characterized in that, described SMSC request AMSC participates in during this calls out, and the AMSC that the address information of second end points sends to this travelling carriage place is specially:

26., it is characterized in that the MGW that described notice links to each other with this AMSC is that this is called out and creates first end points as claim 20,20 or 25 described communication systems, simultaneously the address information of second end points sent to a MGW and be specially:

Described address information with first end points returns to AMSC and is specially:

27. as claim 22 or 25 described communication systems, it is characterized in that, described MODIFY message sends to after the 2nd MGW, and the 2nd MGW sends end points parameter update response MODIFYReply message to SMSC, indicates to set up successfully being connected between a MGW and the 2nd MGW.

28. a communication system is characterized in that, this system comprises: serving mobile switching center SMSC, the AMSC of initial movable switching center, first media gateway MGW and the 2nd MGW, wherein,

After the call request of AMSC reception from calling party's concurrent speech business, the MGW that the AMSC notice links to each other with self is that this calls out establishment first end points, and a MGW returns to AMSC with the address information of first end points;

29. communication system as claimed in claim 28 is characterized in that, the MGW that described AMSC notice links to each other with self calls out establishment first end points for this and is specially:

AMSC sends ADD message to a MGW;

A described MGW returns to AMSC with the address information of first end points and is specially:

30. communication system as claimed in claim 28 is characterized in that, the virtual circuit sign of this calling is set, then described AMSC request SMSC participates in this calling and is specially:

Described address information with first end points sends to SMSC and is specially:

The second end-point addresses information that described SMSC will receive by AMSC returns to a MGW and is specially:

31. communication system as claimed in claim 30, it is characterized in that described SMSC continues according to the request of AMSC after the callee, SMSC call setup result between the AMSC retrieval system returns issetup message, indicate SMSC and accepted this calling, and carried out continuing of callee.

32., it is characterized in that described SMSC is after AMSC sends 200_OK message as claim 30 or 31 described communication systems, AMSC returns ACK message to SMSC, indicates AMSC and has received the 200_OK message that comes from SMSC.

33. communication system as claimed in claim 28 is characterized in that, described AMSC request SMSC participates in during this calls out, and the address information of first end points is sent to SMSC is specially:

34., it is characterized in that the 2nd MGW that described notice links to each other with this SMSC is that this is called out and creates second end points as claim 28,30 or 33 described communication systems, simultaneously the address information of first end points sent to the 2nd MGW and be specially:

Described address information with second end points returns to SMSC and is specially:

35., it is characterized in that described MODIFY message sends to after the MGW as claim 30 or 33 described communication systems, a MGW sends MODIFY Reply message to AMSC, indicates to set up successfully being connected between a MGW and the 2nd MGW.