WO2007048337A1

WO2007048337A1 - Method and system for concurring voice service

Info

Publication number: WO2007048337A1
Application number: PCT/CN2006/002842
Authority: WO
Inventors: Li Jiang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2005-10-27
Filing date: 2006-10-24
Publication date: 2007-05-03
Also published as: CN100401850C; CN1852587A

Abstract

A method for performing concurring voice service after inter-office handover, which comprises: A. the SMSC determines that the calling party has initiated a concurring voice service through the calling BSC, notifies the calling BSC to establish a voice bearer channel with the calling party, and indicates to AMSC that the establishment of voice bearer channel has been completed after successful establishment; B. the AMSC performs call connection to the called party. There is also provided a system for performing concurring voice service after inter-office handover, and the system comprises a calling BSC, a SMSC and a AMSC. With the present invention, the voice loss situation could be avoided, which occurs at the communication initial stages for concurring voice service after inter-office handover.

Description

Method and system for concurrent voice service

Technical field

The present invention relates to concurrent services in a wireless communication system, and more particularly to a method and system for concurrently transmitting voice services after an inter-office handover. Background of the invention

In the third generation (3G) communication system, the mobile station can implement voice services while performing data services through the Packet Data Service Node (PDSN), which is called concurrent services. Specifically, a user using a mobile station (MS) can receive a call from another user or actively call another user to perform voice communication when performing data download or browsing data services such as web pages. Similarly, when a user accesses the network and performs voice services using the mobile station, the data service can also be concurrently transmitted. In the concurrent service, the user can access the data service first and then concurrently send the voice service as needed; or access the voice service first, and then concurrently send the data service.

Since the mobile station changes its location as the user moves, the mobile station occurs when the mobile station moves from the scope of one mobile switching center (MSC) to the scope of another MSC during the course of the service. Inter-office switching. According to the agreement, the MSC that establishes the traffic channel first when the mobile station initiates or receives the call through the base station controller (BSC) is called the initial MSC (AMSC); after the interoffice handover, the MSC to which the mobile station belongs is called the serving MSC ( SMSC). The access location register (VLR) corresponding to the AMSC stores original information such as user information and service authority of the mobile station. The AMSC interacts with the SMSC through the E interface.

Figure 1 shows a network structure diagram of an inter-office handover. Referring to FIG. 1, a mobile station that is performing data services performs AMSC in order to complete an interoffice handover without interrupting data services. When determining that the mobile station moves into the area under the jurisdiction of the SMSC, first sending an inter-office handover invocation message to the SMSC, requesting the SMSC to accept the inter-office handover of the mobile station; after successfully establishing the traffic channel, the SMSC returns an inter-office handover to the AMSC. As a result, a message is returned, so that the mobile station continues the data service through the SMSC. Then, after the mobile station establishes a connection with the BSC under the SMSC, the SMSC sends an inter-office handover complete message to the AMSC, indicating that the current inter-office handover of the mobile station has been completed. . After the interoffice handover is completed during the data service, the original information of the mobile station is still stored in the VLR corresponding to the AMSC.

After the inter-office handover of the mobile station is completed in the progress of the data service, since the original information of the mobile station in which the handover occurs is located in the VLR of the AMSC, the AMSC participates in the process of the concurrent voice service.

FIG. 2 shows a caller signaling flowchart of an existing inter-office handover concurrent voice service. Referring to FIG. 2, taking the called party as a public telephone network (PSTN)-based fixed telephone as an example, the existing method for concurrent voice service after inter-office handover includes the following steps:

Step 201: After the mobile station sends a call request for the concurrent voice service, the calling BSC sends a message to the SMSC that carries the user identity (MSID) of the calling party and the service request request message of the called number. , request SMSC to add a voice service. '

In this step, when a call to the PSTN fixed telephone is initiated after the inter-office handover of the mobile station performing the data service, the calling BSC carries the identity information of the mobile station as the calling MSID, and carries the service together with the called number. In the increase request message, it is sent to the SMSC.

Step 202: The SMSC sends a service add call (ADDSERV) message carrying the calling MSID and the called number to the AMSC according to the request of the calling BSC, requesting the AMSC to initiate the calling process of the concurrent voice service.

In this step, after the SMSC receives the service increase request message from the calling BSC, the message is solved, and the obtained calling MSID and the called number are placed. In the ADDSERV message, send to AMS (:.

Step 203. The AMSC determines, according to the ADDSERV message received by the drop, whether the decision result of the concurrent voice service is allowed, and returns to the SMSC a service add result return (addserv) message carrying the decision result, indicating the situation of the call setup.

In this step, the AMSC first extracts the calling MSID and the called number from the received ADDSERV message, and determines whether the calling mobile station represented by the calling MSID has concurrent voice service according to the mobile station subscription information saved by itself. Permission to determine whether the extracted called number is valid. If the calling mobile station has the right to concurrent voice service and the called number is valid, the decision result of allowing the concurrent voice service is obtained; The judgment result of this concurrent voice service is not allowed. The AMSC then sends the resulting decision to the SMSC via the addserv message.

Steps 204 ~ 206. In the case that the result of the decision is to allow the concurrent voice service, the AMSC sends the called number to the PSTN network through an initial address (IAM) message or an initial address (IAI) message with additional information; PSTN After the network obtains all the called numbers, it returns the address full (ACM) message to the AMSC, indicating that the called number has been collected, and continues the called party, causing the called party's fixed telephone to ring; then the PSTN network is called After the party picks up the phone, it sends an acknowledgement (ANC) message to the AMSC, indicating that the called fixed telephone is off-hook.

Here, when the AMSC determines that the concurrent voice service is allowed, the call is connected to the PSTN network. Specifically, the AMSC first carries the called number obtained from the SMSC in the IAM or IAI message and sends it to the PSTN network; then the PSTN network parses the received IAM or IAI message, extracts the called number, and will After the called number is extracted, the ACM message indicates to the AMSC that all the called numbers have been received; meanwhile, the PSTN network connects the corresponding called fixed telephone according to the extracted called number, and picks up the fixed telephone at the called After the machine, the AMSC is notified by the ANC message.

At this point, the SMSC establishes a connection with the called party. It should be noted that when the result of the judgment indicates that the concurrent voice service is not allowed, the process of concurrent voice service after the inter-office handover is directly ended.

Steps 207 ~ 208. After determining the allowed concurrent voice service according to the decision result in the received addserv message, the SMSC sends an Assignment Request message to the calling BSC to notify the calling BSC to occupy the calling mobile station. The A interface circuit of the communication, and the air channel is allocated for the concurrent voice service; the calling BSC returns an Assignment Complete message to the SMSC, indicating that the A interface circuit has been successfully occupied and the air channel is allocated.

After the SMSC receives the addserv message from the AMSC, the judgment result is extracted therefrom. When the judgment result indicates that the concurrent voice service is allowed, the calling BSC is interacted to realize the occupation of the A interface circuit and the allocation of the air channel. The two steps here are often referred to as the voice bearer channel establishment process.

So far, the voice transmission channel between the calling party and the called party where the inter-office handover occurs is established, so that the calling party and the called party can implement the voice call thereafter.

In the process of concurrent voice service after the interoffice handover, after the AMSC determines to allow the concurrent voice service, the AMSC can send the decision result to the SMSC and perform call connection to the called PSTN network. In other words, the above steps 203 and 204 do not have a strict sequence in time, that is, step 203 may be performed before step 204 or after step 204.

In the existing method of concurrent voice service after inter-office handover, there are the following disadvantages: When the calling mobile station concurrently performs voice service after the inter-office handover, the caller is in the case of less available airborne wireless resources. The BSC allocates the air channel for a long period of time, that is, the SMSC delays the transmission of the assignment request message from the calling BSC after the assignment request message is sent. If the AMSC initiates a call connection to the called party earlier and the call completion time is shorter, before the SMSC establishes a connection with the calling party, The AMSC completes the connection with the called party. In this way, if the called party picks up the phone faster, because the voice channel between the SMSC and the calling party has not been established yet, the calling user cannot hear the called user's voice at the beginning of the call, which causes the swallowing phenomenon. Summary of the invention

The invention provides a method for concurrent voice service after inter-office handover, which eliminates the phenomenon of swallowing in the initial stage of the call.

In the method for concurrently transmitting voice services after inter-office handover according to the inventive concept, the following steps are included:

A. The serving mobile switching center SMSC determines that the calling party initiates a concurrent voice service by the calling base station controller BSC, notifies the calling BSC to establish a voice bearer channel with the calling party, and after the successful establishment, moves to the initial mobile station. The switching center AMSC indicates that the voice bearer channel is completed;

B. The AMSC makes a call connection to the called party.

The present invention also provides a system for concurrently transmitting voice services after inter-office handover, which can eliminate the phenomenon of swallowing in the initial stage of the call.

The system for concurrently transmitting voice services after the inter-office handover according to the present invention includes: a calling base station controller BSC, a serving mobile switching center SMSC, and an initial mobile switching center AMSC, where

The calling BSC is configured to receive a request for a concurrent voice service from the calling party, notify the SMSC calling party to initiate a concurrent voice service, establish a voice bearer channel with the calling user under the notification of the SMSC, and notify the SMSC Successful establishment;

The SMSC is configured to receive a notification from the calling BSC about the originating voice service initiated by the calling party, notify the calling BSC to establish a voice bearer channel with the calling party, and receive the voice bearer channel from the calling BSC. Establish a completed notification and correspond to the calling party The AMSC indicates that the voice bearer transmission channel is established;

The AMSC receives a notification from the SMSC that the voice bearer transmission channel is established and performs call connection to the called party.

After the calling BSC establishes a connection with the calling party, the SMSC notifies the AMSC of the successful connection of the calling party by indicating to the AMSC that the voice bearer channel is established, and then the AMSC initiates the calling party. The call is connected, and the voice channel between the AMSC and the called party is always established after the SMSC successfully connects with the calling party. Therefore, even if the calling BSC spends a long time to allocate an empty channel due to less available over-the-air radio resources, and the called party picks up the aircraft faster, it does not appear to be swallowed in the early stage of the calling party. BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a network structure diagram of inter-office handover.

FIG. 2 is a flow chart of calling signaling of a concurrent voice service after an inter-office handover.

FIG. 3 is an exemplary flow diagram of concurrent voice services after inter-office handover in accordance with the teachings of the present invention.

4 is a flow chart of calling party signaling of concurrent voice services after inter-office handover in Embodiment 1 of the present invention.

FIG. 5 is a structural diagram of a system for concurrent voice service after inter-office handover according to Embodiment 1 of the present invention.

FIG. 6 is a flow chart of calling signaling of concurrent voice services after multiple inter-office handovers according to Embodiment 1 of the present invention.

FIG. 7 is a schematic structural diagram of a system for concurrently transmitting voice services after multiple inter-office handovers according to Embodiment 1 of the present invention.

8 is a signaling process of calling party signaling for concurrent voice services after inter-office handover in Embodiment 2 of the present invention; Figure.

FIG. 9 is a flowchart of calling signaling of concurrent voice services after multiple inter-office handovers according to Embodiment 2 of the present invention. Mode for carrying out the invention

3 is a flow chart showing an exemplary method of concurrent voice traffic after inter-office handover in accordance with the teachings of the present invention. Referring to Figure 3, the method includes:

In step 301, the SMSC determines that the calling party initiates the concurrent voice service by the calling BSC, and notifies the calling BSC to establish a voice bearer channel with the calling party, and after the establishment is successful, indicates to the AMSC that the voice bearer channel is established. carry out;

In step 302, the AMSC makes a call connection to the called party.

Here, establishing a voice bearer transmission channel between the SMSC and the calling party includes an operation of occupying the A interface circuit and allocating an air channel for the concurrent voice service. It can be seen that, after the inter-office handover is followed by the voice service, the SMSC indicates to the AMSC that the establishment of the voice bearer channel is completed after the operation of establishing the voice bearer transmission channel is completed, and the AMSC performs the connection to the called side. Then, when the calling BSC takes a long time to allocate the air channel, and the called party picks up the phone faster, the initial swallowing phenomenon of the calling party and the called party is effectively avoided.

The technical solution based on the idea of the present invention will be described in detail below through two embodiments. Embodiment 1: The notification of the AMSC is performed by using a voice bearer channel setup complete message. In this embodiment, after the calling BSC learns that the calling party after the inter-office handover initiates the concurrent voice service, the SMSC requests the AMSC corresponding to the calling party to allow the concurrent voice service, and if the AMSC allows, notify the calling party. The BSC establishes a voice bearer transmission channel and notifies the AMSC after the establishment is completed.

FIG. 4 is a flow chart showing the calling signaling s of the concurrent voice service after the inter-office handover in this embodiment. As shown in FIG. 4, the method in this embodiment includes the following steps: Step 401. The calling BSC sends a service request message carrying the MSID of the calling MS and the called number to the SMSC after the calling mobile station sends the calling request of the concurrent voice service, requesting the SMSC to add a voice. business.

Steps 402 to 403. The SMSC sends an ADDSERV message carrying the calling MSID and the called number to the AMSC according to the request of the calling BSC, requesting the AMSC to initiate the calling process of the concurrent voice service; and the AMSC determines the indication according to the received ADDSERV message. Whether the judgment result of the concurrent voice service is allowed, and returning the service adding result carrying the judgment result to the SMSC and returning the addserv message, indicating the current call establishment situation.

The above steps 401 to 403 are the same as steps 201 to 203 in the prior art.

Steps 404 to 405. After determining, according to the decision result in the received addserv message, the SMSC sends the assignment request message to the calling BSC after the current concurrent voice service is allowed, and notifies the calling BSC to occupy the communication with the calling mobile station. The interface circuit allocates an air channel for the concurrent voice service; the calling BSC returns the assignment completion message to the SMSC, indicating that the A interface circuit has been successfully occupied and the air channel is allocated.

After the SMSC receives the addserv message from the AMSC, the judgment result is extracted therefrom. When the judgment result indicates that the concurrent voice service is allowed, the calling BSC is interacted to realize the occupation of the A interface circuit and the allocation of the air channel, and complete the establishment of the voice bearer with the calling mobile station.

Step 406. The SMSC sends a voice bearer channel setup complete message to the AMSC, indicating that the SMSC has successfully established a voice bearer with the calling mobile station.

After receiving the assignment completion message, the SMSC determines that the SMSC completes the occupation of the A interface circuit and allocates the air channel, and in this step, establishes a completion message through the voice bearer channel, and notifies the AMSC that the voice to the calling mobile station has been established. Carrying a channel.

Step 407. The AMSC makes a call connection to the called party.

The AMSC determines that the message is received from the SMSC by identifying the message name or the like. After the voice bearer channel setup complete message, in this step, a call connection is initiated to the called party to establish a voice transmission channel with the called party.

Specifically, when the called party is a PSTN fixed telephone, the method of the call connection in this step is: the AMSC sends the called number to the PSTN network through the IAM message or the IAI message, and notifies the PSTN network to establish the fixed telephone with the called party. After the PSTN network obtains all the called numbers, it returns the ACM message to the AMSC, indicating that the called number is received, and then the called fixed telephone is connected to cause the called fixed telephone to ring; then the PSTN network sends an ANC message to the AMSC. , indicating that the called fixed telephone is off-hook.

When the called party is the local mobile station of the AMSC, the method of the call connection in this step is: the AMSC carries a paging request (Paging Request) that is identified by the called user, such as the called number or the called MSID including the called number. a message, informing the called BSC to determine the location area and status of the called mobile station, and the called BSC finds the cell in which the called mobile station is currently located according to the location area in the received paging request message, and detects the called party When the mobile station is in the on state and idle state, it returns a paging response (Paging Response) message to the AMSC, indicating that the called BSC has accepted the AMSC request; then, the AMSC interacts with the called BSC to perform a voice bearer channel establishment process, that is, AMSC. The assignment request message is used to notify the called BSC to establish a voice bearer channel with the called mobile station. After the called BSC completes the establishment of the voice bearer channel, the assignment completion message is returned to the AMSC as a response to the assignment request message. And continuing to the called mobile station, causing the called mobile station to ring; then the called BSC sends a Connect message to the AMSC indicating that the called mobile station is off-hook. In addition, in this case, the process of interacting between the AMSC and the called BSC through the paging request message and the paging response message is generally referred to as a called paging procedure. The called paging process can be performed after the AMSC obtains the decision result of allowing the concurrent voice service, and there is no strict sequence requirement in time with the voice bearer channel setup completion message. Specifically, after determining the result of the decision, the AMSC determines whether the decision result indicates that the concurrent voice service is allowed, and if yes, performs the search. The process of calling the voice service; otherwise, the process of concurrent voice service after the inter-office handover is ended.

When the called party is a non-local mobile station of the AMSC, the method of the call connection in this step is: the AMSC sends the called number to the called MSC through the IAM message or the IAI message, and notifies the called MSC to establish a fixed call with the called party. After the called MSC obtains all the called numbers, it returns the ACM message to the AMSC, indicating that the called number has been collected, and continues the called mobile station, causing the called mobile station to ring; then the called MSC sends the AMSC to the AMSC. Send an ANC message indicating that the called mobile station is off-hook.

So far, a voice transmission channel between the AMSC and the called party has been established. Since the SMSC and the AMSC can communicate directly, after the above steps 401 ~ 407, the voice transmission channel between the calling party and the called party is successfully established, and thereafter, the calling party and the called party can make a voice call.

FIG. 5 shows a system for concurrent voice service after interoffice handover in this embodiment. Referring to Figure 5, the system includes calling BSC., SMSC, and AMSC. The calling BSC is used to receive the request for the concurrent voice service from the calling party, notify the SMSC calling party to initiate the concurrent voice service, establish a voice bearer channel with the calling user under the notification of the SMSC, and notify the SMSC. The establishment succeeds; the SMSC receives a notification from the calling BSC about the originating voice service initiated by the calling party, notifying the calling BSC to establish a voice 7-channel between the calling party and receiving the voice bearer channel from the calling BSC. Establishing the completed notification, and indicating to the AMSC corresponding to the calling party that the voice bearer transmission channel establishment is completed; the AMSC receives the notification from the SMSC that the voice bearer transmission channel is established, and performs call connection to the called party.

Specifically, the SMSC in this embodiment includes a message receiving module, a voice service control module, and a message sending module. The message receiving module in the SMSC receives a notification from the calling BSC about the originating voice service initiated by the calling user, sends the notification of the initiated voice service to the voice service control module, and receives the voice bearer from the calling BSC. Pass The notification of completion of the establishment of the road is sent to the voice service control module. The voice service control module receives a notification from the calling party of the message receiving module to initiate a concurrent voice service, and parses out the calling party identity identifier and the called number from the received notification, which indicates that the voice between the calling party and the calling party is established. The notification of the bearer channel is sent to the message sending module in the SMSC; and receiving the notification that the voice bearer channel is completed from the message receiving module, and synthesizing the voice bearer transport channel for the AMSC according to the resolved calling identity identifier and the called number A completed notification is established, and the synthesized notification is sent to the message sending module of the SMSC. The message sending module in the SMSC receives a notification from the voice service control module indicating that the voice bearer channel between the calling party and the calling party is established, and sends the notification to the calling BSC; and receives the voice bearer from the voice service control module. A notification that the transport channel setup is complete, and the notification is sent to the AMSC.

Correspondingly, the AMSC in this embodiment also includes a message receiving module, a voice service control module, and a message sending module. The message receiving module in the AMSC is configured to receive a notification from the SMSC indicating that the voice bearer transmission channel is established, and send the notification to the voice service control module in the AMSC; the voice service control module receives the message received from the AMSC. The module indicates that the voice bearer transmission channel is established, and then the call is sent between the message sending module and the called party in the AMSC; the message sending module in the AMSC is under the control of the voice control module, and the called party Make a call connection.

In addition, the voice service control module in the SMSC of the present embodiment further synthesizes a notification indicating that the AMSC initiates the calling service of the concurrent voice service according to the parsed identity of the calling party, and sends the notification to the message sending module in the SMSC. And receiving the judgment result of the AMSC from the message receiving module of the SMSC, and if the judgment result indicates that the AMSC allows the concurrent voice service, proceeding to perform the foregoing notification sending that indicates establishing the voice bearer channel with the calling party. Send a module to the message in the SMSC. The message receiving module in the SMSC also receives the judgment result from the AMSC, and sends the received judgment result. Give the voice service control module in the SMSC. The message sending module in the SMSC receives a notification from the voice service control module in the SMSC indicating that the AMSC initiates the calling process of the concurrent voice service, and sends the notification to the AMSC.

Correspondingly, the message receiving module in the AMSC also receives a notification from the SMSC indicating that the calling process for initiating the concurrent voice service is initiated, and sends the notification to the voice service control module in the AMSC. The voice service control module in the AMSC receives a notification from the message receiving module of the AMSC requesting to initiate a call flow of the concurrent voice service, determines a decision result indicating whether the concurrent voice service is allowed, and sends the decision result to the AMSC. The messaging module in . The message sending module in the AMSC receives the decision result from the voice service control module in the AMSC, and sends the decision result to the SMSC.

The above is the case where the mobile station concurrently transmits voice services after an inter-office handover in this embodiment. If the calling mobile station performs the inter-office handover again after the inter-office handover, the MSC to which the calling mobile station belongs after the first handover is the intermediate MSG (TMC), and the MSC to which the calling mobile station belongs after the second handover. For the SMSC. In this case, the TMSC provides a relay for communication between the SMSC and the AMSC.

Fig. 6 is a flow chart showing the calling party signaling of the concurrent voice service after multiple inter-office handovers in this embodiment. As shown in FIG. 6, the method in this embodiment includes the following steps:

Step 601. After the calling mobile station sends a call request for the concurrent voice service, the calling BSC sends a service request request message carrying the cell such as the calling MSID and the called number to the SMSC, requesting the SMSC to add a voice service.

Steps 602 ~ 605. According to the request of the calling BSC, the SMSC sends an ADDSERV message carrying the calling MSID and the called number to the AMSC through the TMSC, requesting the AMSC to initiate the calling process of the concurrent voice service; and the AMSC according to the received ADDSERV message. Determining whether the decision result of the concurrent voice service is allowed, and returning to the SMSC by the TMSC to return the addserv message carrying the result of the service with the decision result, indicating The situation of this call setup.

The difference between the four steps here and the foregoing steps 402 ~ 403 is that the message between the SMSC and the AMSC must pass through the transit of the TMSC before it can reach the receiving end of the above message.

Step 606 607. After determining, according to the decision result in the received addserv message, the SMSC sends an assignment request message to the calling BSC after the current concurrent voice service is allowed, and notifies the calling BSC to occupy the A interface between the calling mobile station and the calling mobile station. The circuit and the air channel are allocated for the concurrent voice service; the calling BSC returns the assignment completion message to the SMSC indicating that the A interface circuit has been successfully occupied and the air channel is allocated.

The two steps of this section are the same as the aforementioned steps 404 to 405.

Steps 608 ~ 609. The SMSC sends a voice bearer channel setup complete message to the AMSC through the TMSC, indicating that the SMSC has successfully established a voice bearer with the calling mobile station.

The SMSC, according to the received assignment completion message, determines that the SMSC completes the occupation of the A interface circuit and allocates the air channel, first sends a voice bearer channel setup complete message to the TMSC, indicating that the voice bearer channel to the calling mobile station has been established; The TMSC forwards the received voice bearer channel setup complete message to the AMSC.

Step 610. The AMSC makes a call connection to the called party.

The method of call connection in this step is the same as the method of the foregoing step 407.

So far, the process of concurrent voice service after multiple inter-office handovers in this embodiment is completed.

In order to ensure the smooth progress of the above process, the present embodiment constructs a system for concurrent voice services after inter-office handover according to the structure shown in FIG. Referring to Figure 7, the system includes: a calling BSC, an SMSC, a TMSC, and an AMSC. The calling BSC is exactly the same as the calling BSC in FIG. The TMSC acts as a relay between the SMSC and the AMSC. Specifically, the TMSC receives the notification from the SMSC indicating that the establishment of the voice bearer transmission channel is completed, and sends the notification to the AMSC. In addition, receiving the notification from the SMSC indicating that the AMSC initiates the call flow of the concurrent voice service. , send the notification to AMSC, and connect The decision result from the AMSC is received, and the decision result is sent to the SMSC.

In the two flows shown in Figures 4 and 6 above, the SMSC establishes a completion message through the voice bearer channel, indicating to the AMSC that the SMSC has successfully established a voice bearer with the calling party. Since the AMSC initiates a call connection to the called party after learning that the SMSC successfully establishes a voice bearer with the calling party, the voice channel between the AMSC and the called party is always after the SMSC successfully connects with the calling party. set up. Therefore, even if the calling BSC spends a long time to allocate the over-the-air channel due to the small amount of available over-the-air radio resources, and the called party picks up the flight faster, it does not cause a swallowing phenomenon in the initial stage of the calling party.

Next, a method for the SMSC to successfully notify the SMSC of the voice bearer between the calling party and the calling party through the ADDSERV message will be described.

Embodiment 2: The notification of the AMSC is performed by using the ADDSERV message.

FIG. 8 is a flow chart showing the calling party signaling of the concurrent voice service after the inter-office handover in this embodiment. As shown in FIG. 8, the method in this embodiment includes the following steps:

Step 801. After the calling mobile station sends a call request for the concurrent voice service, the calling BSC sends a service request request message carrying the cell such as the calling MSID and the called number to the SMSC, requesting the SMSC to add a voice service.

The 802. The completion message is returned to the SMSC, indicating that the A interface circuit has been successfully occupied and the air channel is allocated, that is, the voice bearer channel between the caller and the calling party is successfully established.

After receiving the service increase request from the calling BSC, the SMSC extracts and saves the calling MSID and the called number in the message, and then interacts with the calling BSC to implement the occupation of the A interface circuit and the allocation of the air channel. The establishment of a voice bearer with the calling mobile station is completed. Steps 804 ~ 805. The SMSC carries the received MSID and the called number in the ADDSERV message, sends it to the AMSC, requests the AMSC to initiate the calling process of the concurrent voice service, and indicates that the SMSC has successfully established the calling party. The voice bearer channel between the two; the AMSC returns an addserv message to the SMSC indicating that the request of the SMSC in the ADDSERV message is accepted.

Here, in addition to the role of the calling procedure for requesting the initiation of the concurrent voice service in Embodiment 1, the ADDSERV message can notify the AMSC of the fact that the SMSC has successfully established the voice bearer channel with the calling party. Therefore, the ADDSERV message in this embodiment is equivalent to the action of the ADDSERV message and the voice bearer channel setup completion message in Embodiment 1.

Step 806. The AMSC makes a call connection to the called party.

After receiving the voice bearer channel setup complete message from the SMSC, the AMSC initiates a call connection to the called party in this step to establish a voice transmission channel with the called party. The method of the call connection in this step is the same as the step 407 in the first embodiment.

So far, a voice transmission channel between the AMSC and the called party has been established. Since the SMSC and the AMSC can communicate directly, after the above steps 801-806, the voice transmission channel between the calling party and the called party is successfully established, and then the calling party and the called party can utilize the established voice. The transmission channel makes a voice call.

The above is a method for concurrently transmitting a voice service after the inter-office handover occurs in the calling mobile station. The following describes a method for concurrently transmitting a voice service after the inter-office handover occurs in the calling mobile station.

In the embodiment, the system for concurrent voice service after inter-office handover shown in FIG. 5 can still be used to execute the foregoing process. However, the difference is that, in this embodiment, the SMSC requests the AMSC to initiate the calling process of the concurrent voice service while indicating to the AMSC that the voice bearer transmission channel is established. FIG. 9 is a flow chart showing the calling party signaling of the concurrent voice service after multiple inter-office handovers in this embodiment. As shown in FIG. 9, the method in this embodiment includes the following steps:

Step 901. After the calling mobile station sends a call request for the concurrent voice service, the calling BSC sends a service request request message carrying the cell such as the calling MSID and the called number to the SMSC, requesting the SMSC to add a voice service.

Step 902 903. The SMSC sends an assignment request message to the calling BSC, notifying the calling BSC to occupy the A interface circuit for communication with the calling mobile station, and allocating an air channel for the concurrent voice service; the calling BSC will assign The completion message is returned to the SMSC indicating that the A interface circuit has been successfully occupied and the air channel is allocated, that is, the voice bearer channel between the caller and the calling party is successfully established.

The two steps here are the same as the aforementioned steps 802 to 803.

Steps 904 ~ 907. The SMSC carries the received MSID and the called number in the ADDSERV message, sends it to the AMSC through the TMSC, requests the AMSC to initiate the calling process of the concurrent voice service, and indicates that the SMSC has successfully established the calling party. The voice bearer channel between the parties; the AMSC returns an addserv message to the SMSC through the TMSC, indicating that the request of the SMSC in the ADDSERV message is accepted.

The ADDSERV message here can also implement the functions of the ADDSERV message and the voice bearer channel setup completion message in Embodiment 1.

In addition, the difference between the four steps here and the foregoing steps 804-805 is that the message between the SMSC and the AMSC must be transferred to the receiving end of the message after being transited by the TMSC.

Step 908. The AMSC makes a call connection to the called party.

After receiving the voice bearer channel setup complete message from the SMSC, the AMSC initiates a call connection to the called party in this step to establish a voice transmission channel with the called party. The method of the call connection in this step is the same as the step 407 in the first embodiment. At this time, a voice transmission channel between the AMSC and the called party is established. Since the SMSC can communicate directly with the AMSC, after the above steps 901-908, the voice transmission channel between the calling party and the called party is successfully established, and then the calling party and the called party can utilize the established voice. The transmission channel makes a voice call.

Here, the system shown in FIG. 7 can still be used to perform the process of concurrent voice service after multiple inter-office handovers in this embodiment. The difference is that in this embodiment, the SMSC requests the AMSC to initiate the calling process of the concurrent voice service while indicating to the AMSC that the voice bearer transmission channel is established through the TMSC.

In the above two processes of the embodiment, after receiving the assignment completion message from the calling BSC, the SMSC indicates the SMSC to the AMSC by requesting the AMSC to initiate the calling process of the concurrent voice service through the ADDSERV message. The voice bearer with the calling party has been successfully established. Since the AMSC initiates a call connection to the called party after learning that the SMSC successfully establishes a voice bearer with the calling party, the voice channel between the AMSC and the called party is always after the SMSC successfully connects with the calling party. set up. Therefore, even if the calling BSC spends a long time to allocate the air channel due to the small amount of available airborne radio resources, and the called party picks up the aircraft faster, it does not appear to be swallowing in the early stage of the calling party.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are made within the spirit and principles of the present invention, should be included in the present invention. Within the scope of protection.

Claims

Claim

A method for concurrently transmitting a voice service after an inter-office handover, characterized in that the method comprises the following steps:

A. The serving mobile switching center SMSC determines that the calling party initiates a concurrent voice service by the calling base station controller BSC, notifies the calling BSC to establish a voice bearer channel with the calling party, and after the successful establishment, moves to the initial mobile station. The switching center AMSC indicates that the voice bearer channel is established;

B. The AMSC makes a call connection to the called party.

2. The method according to claim 1, wherein the SMSC determines, by the calling BSC, that the calling party initiates the concurrent voice service by: the calling party sends a concurrent voice service request to the calling BSC, and the calling BSC is sent. Request SMSC to add voice service.

The method according to claim 2, wherein the calling BSC requests the SMSC to add a voice service to: the calling BSC sends a service request request to the SMSC that carries the calling party identity MSID and the called number. Service Request message. '

The method according to claim 1, wherein the step A is to notify the calling BSC to establish a voice bearer channel intermediate the calling party:

The SMSC sends an Assignment Request message to the calling BSC, informing the calling party that the BSC establishes a voice bearer channel with the calling party; the calling BSC occupies the A interface circuit for communication with the calling party, and this time The concurrent voice service allocates an air channel, and then returns an Assignment Complete message to the SMSC.

The method of claim 1, wherein after the SMSC determines that the calling party initiates the concurrent voice service by using the calling BSC, the method further includes:

The SMSC requests the AMSC to initiate a calling process of the concurrent voice service, and the AMSC determines whether the decision result of the concurrent voice service is allowed, and returns the determined decision result to the SMSC;

The SMSC determines whether the AMSC allows the current concurrent voice service according to the received decision result. If yes, the process continues to perform the step A to notify the calling BSC to establish a voice bearer channel with the calling party. Otherwise, the interoffice is terminated. The process of concurrent voice service after switching.

The method according to claim 5, wherein the calling process for requesting the AMSC to initiate the concurrent voice service is: the SMSC sends a service add ADDSERV message carrying the calling MSID and the called number to the AMSC;

The returning the decision result to the SMSC is: The AMSC returns a service add result carrying the decision result to the SMSC to return an addserv message.

The method according to claim 6, wherein the step A indicates that the voice bearer channel is established to the AMSC as follows: The SMSC sends a voice bearer channel setup complete message to the AMSC.

The method according to claim 5, wherein the calling process for requesting the AMSC to initiate the concurrent voice service is: the SMSC sends an ADDSERV message carrying the calling MSID and the called number to the intermediate mobile switching center TMSC. The TMSC forwards the received ADDSERV message to the AMSC;

The returning the determined decision result to the SMSC is: The AMSC returns an addserv message carrying the decision result to the TMSC, and the TMSC forwards the received addserv message to the SMSC.

The method according to claim 8, wherein the step A indicates that the voice bearer channel is established to the AMSC as follows: The SMSC sends a voice bearer channel setup complete message to the TMSC, and the TMSC establishes the received voice bearer channel. The message is forwarded to the AMSC.

The method according to any one of claims 5 to 9, wherein the AMSC determines whether the decision result indicating whether the concurrent voice service is allowed is:

According to the received MSID of the calling party and the mobile station subscription information saved by the AMSC, the AMSC does Determining whether the calling party represented by the calling MSID has the right to concurrent voice service, and determining whether the extracted called number is valid. If the calling party has the right to concurrent voice service and the called number is valid, then The judgment result of the concurrent voice service is allowed, otherwise, the judgment result that the concurrent voice service is not allowed is obtained.

The method according to claim 1, wherein the step A indicates to the AMSC that the establishment of the voice bearer channel is completed, and further includes: requesting the AMSC to initiate a calling process of the concurrent voice service;

Step B: Before the AMSC makes a call connection to the called party, or at the same time, further includes: the AMSC indicates to the SMSC that the request for the calling process for initiating the concurrent voice service is accepted.

The method according to claim 11, wherein, when the AMSC indicates that the establishment of the voice bearer channel is completed, the calling process for requesting the AMSC to initiate the concurrent voice service is: the SMSC sends the bearer MSID to the AMSC and ADDSERV message of the called number;

The request by the AMSC to indicate to the SMSC that the calling procedure for initiating the concurrent voice service has been accepted is: The AMSC returns an addserv message to the SMSC.

The method according to claim 11, wherein, when the AMSC indicates that the establishment of the voice bearer channel is completed, the calling process for requesting the AMSC to initiate the concurrent voice service is: the SMSC sends the bearer MSID to the TMSC and The ADDSERV message of the called number, the TMSC forwards the received ADDSERV message to the AMSC;

The request by the AMSC to indicate to the SMSC that the calling procedure for initiating the concurrent voice service has been accepted is: The AMSC returns an addserv message to the TMSC, and the TMSC forwards the received addserv message to the SMSC. '

The method according to claim 5 or 11, wherein the called party is a public telephone network PSTN fixed telephone, and the call connection to the called party is performed in step B:

AMSC passes the initial address IAM message or the initial address IAI with additional information The message, the called number is sent to the PSTN network, 'notifying the PSTN network to establish a connection with the called party; after the PSTN network obtains all the called numbers, the address full ACM message is returned to the AMSC, indicating that the called number has been collected. And then the called party is spurred to cause the called party to ring; then the PSTN network sends a response ANC message to the AMSC indicating that the called party is off-hook.

The method of claim 5, wherein the called party is the local mobile station of the AMSC, and the AMSC determines, after determining the decision result of whether to allow the concurrent voice service, the method further includes:

Determining whether the result of the decision is to allow the concurrent voice service. If yes, the AMSC requests the called BSC to determine the location area and status of the called party by using the paging request Paging Request message carrying the called user identifier, and the called BSC is based on The location area of the called party in the received paging request message finds the cell where the called party is currently located, and returns a paging response Paging Response message to the AMSC when detecting that the called party is in the state of being powered on and idle, indicating The called BSC has accepted the request of the AMSC; otherwise, the process of concurrent voice service after the inter-office handover is terminated;

The call connection to the called party in step B is as follows:

The AMSC informs the called BSC to establish a voice bearer channel with the called party through the assignment request message. After the called BSC completes the establishment of the voice bearer channel, the ABS returns the assignment completion message to the AMSC, and continues to the called party. The called party rings; the called BSC sends a Connect Connect message to the AMSC, indicating that the called party is off-hook.

The method according to claim 11, wherein the called party is a local mobile station of the AMSC, and the AMSC performs a call connection to the called party in the step B:

B21. The AMSC informs the called BSC to determine the location area and status of the called party by using the paging request message carrying the called user identifier, and the called BSC finds the location area of the called party according to the received paging request message. Calling the cell where the party is currently located, and returning a paging response message to the AMSC when detecting that the called party is in the state of being powered on and idle, indicating the called BSC Has accepted the request of AMSC;

B22. The AMSC sends the calling number to the called BSC through the assignment request message, and notifies the called BSC to establish a voice bearer channel between the called party and the called party. After the called BSC completes the establishment of the voice bearer channel, the AMSC will complete the assignment. The message is returned to the AMSC, and the called party is connected to prompt the called party to ring;

B23. The called BSC sends a Connect Connect message to the AMSC indicating that the called party is off-hook.

The method according to claim 5 or 11, wherein the called party is a non-local mobile station of the AMSC, and the call connection of the called party in step B is:

The AMSC sends the called number to the called BSC through the IAM message or the IAI message, and informs the called BSC to establish a connection with the called party. After the called BSC obtains all the called numbers, the ACM message is returned to the AMSC, indicating that the The called number is collected, and the called party is connected to cause the called party to ring; the called BSC sends an ANC message to the AMSC, indicating that the called party picks up the phone.

18. A system for concurrent voice service after inter-office handover, the system comprising: a calling base station controller BSC, a serving mobile switching center SMSC, and an initial mobile switching center AMSC, wherein

The calling BSC is configured to receive a request for a concurrent voice service from the calling party, notify the SMSC calling party to initiate a concurrent voice service, establish a voice carrying channel with the calling user under the notification of the SMSC, and notify the SMSC Successful establishment;

The SMSC is configured to receive a notification from the calling BSC about the originating voice service initiated by the calling party, notify the calling BSC to establish a voice bearer channel with the calling party, and receive the voice bearer channel from the calling BSC. Establishing a completed notification, and indicating to the AMSC corresponding to the calling party that the voice bearer transmission channel establishment is completed;

The AMSC receives a notification from the SMSC that the voice bearer transmission channel is established and performs call connection to the called party. .

19. The system of claim 18, wherein the SMSC comprises: a message receiving module, a voice service control module, and a message sending module, where

The message receiving module receives a notification from the calling BSC about the originating voice service initiated by the calling user, sends the notification of the initiated voice service to the voice service control module, and receives the voice bearer channel from the calling BSC. The notification of the establishment completion is sent to the voice service control module;

The voice service control module receives a notification from the calling party of the message receiving module to initiate a concurrent voice service, and resolves the calling party identity identifier and the called number from the received notification, which indicates that the establishment and the calling party are established. The notification of the voice bearer channel is sent to the message sending module in the SMSC; and receiving the notification that the voice bearer channel is completed from the message receiving module, and synthesizing the voice bearer for the AMSC according to the resolved calling identity identifier and the called number Transmitting a notification that the channel establishment is complete, and transmitting the synthesized notification to the message sending module of the SMSC;

The message sending module receives a notification from the voice service control module indicating that a voice bearer channel is established between the calling party and the calling party, and sends the notification to the calling BSC; and receives the voice bearer transmission from the voice service control module. Notification of completion of channel establishment, and send the notification to AMSC.

The system of claim 19, wherein the AMSC comprises a message receiving module, a voice service control module, and a message sending module, where

The message receiving module is configured to receive a notification from the SMSC indicating that the voice bearer transmission channel is established, and send the notification to the voice service control module in the AMSC; the voice service control module receives the representation of the message receiving module from the AMSC. The voice bearers the completion of the establishment of the transport channel, and then performs call connection between the message sending module and the called party in the AMSC;

The message sending module in the AMSC performs call connection with the called party under the control of the voice control module.

The system according to claim 20, wherein the voice service control module in the SMSC is further configured to: according to the parsed identity of the calling party, synthesize a calling process that requests the AMSC to initiate a concurrent voice service. Notifying that the notification is sent to the message sending module in the SMSC; and receiving the judgment result of the AMSC from the message receiving module of the SMSC, and if the judgment result indicates that the AMSC allows the concurrent voice service, continuing to execute the above The notification of establishing a voice bearer channel with the calling party is sent to the message sending module in the SMSC;

The message receiving module in the SMSC is further configured to receive the judgment result from the AMSC, and send the received judgment result to the voice service control module in the SMSC. The message sending module in the SMSC receives a notification from the voice service control module in the SMSC requesting the AMSC to initiate a call flow of the concurrent voice service, and sends the notification out.

The system according to claim 21, wherein the message receiving module in the AMSC is further configured to receive a notification from the SMSC indicating that the calling process for initiating the concurrent voice service is initiated, and send the notification to The voice service control module in the AMSC; the voice service control module in the AMSC is further configured to receive a notification from the message receiving module of the AMSC requesting to initiate a call flow of the concurrent voice service, to determine whether to allow the concurrent voice to be allowed. The result of the decision of the service, and the result of the decision is sent to the message sending module in the AMSC;

The message sending module in the AMSC receives the decision result from the voice service control module in the AMSC, and sends the decision result to SMS:.

The system according to claim 22, wherein the system further comprises: an intermediate mobile switching center TMSC, configured to receive a notification from the SMSC indicating that the voice bearer transmission channel is established, and send the notification Sending, to the AMSC, a notification from the SMSC indicating that the AMSC initiates a call flow of the concurrent voice service, and sends the notification Giving the AMSC, and receiving the decision result from the AMSC, and transmitting the decision result to the SMSC