CN101026806A - Method for transmitting DTMF information for CDMA system - Google Patents

Abstract

The invention discloses a method for transmitting dual-tone multi-frequency (DTMF) information in a code division multiple access (CDMA) system. The method includes: A. establishing a communication connection between the calling party and the called party; It is carried in the signaling, and the signaling carrying the DTMF information is transmitted to the called party, and the called party obtains the DTMF information from the signaling. After the application of the invention, the DTMF information can be transmitted more reliably, and it is especially suitable for the CDMA system under the network structure of Internet Protocol (IP) and bearer control separation.

Description

A method of transmitting dual-tone multi-frequency information in a code division multiple access system

technical field

The invention relates to the technical field of mobile communication, more specifically, a method for transmitting dual-tone multi-frequency (DTMF) information in a code division multiple access (CDMA) system.

Background technique

With the continuous development of mobile communication technology, the network structure of CDMA system is also continuously improved, and various new applications are emerging one after another. At present, CDMA has developed towards the direction of full Internet Protocol (IP) and separation of control and bearer. Under the new CDMA network structure, it is difficult to realize these new applications according to the original standard protocol, and through the A interface protocol between the base station subsystem (BSS) and the second-generation mobile switching center analog equipment (MSCe) It can be realized by extension.

DTMF is a kind of subscriber line signaling, which can be sent by the dual-tone telephone to the exchange for calling, and can also be sent by the exchange to the dual-tone telephone to provide caller identification (CID) services. At present, in the CDMA system, the DTMF information is transmitted by compressing the DTMF information into an in-band tone, and an entity in the network (such as MSCe) completes the detection of the in-band tone and restores the DTMF information.

When the transmission network is transmitted with standard G.711, this way of compressing DTMF information and transmitting it in the in-band tone is feasible. However, when the network structure is IP-based, because the voice transmission is transmitted by IP, a coding format with a relatively large compression rate is generally used at this time, so if the DTMF information is still compressed in the in-band tone for transmission, it may cause DTMF The signal is distorted. In this way, the button information will be wrongly detected or invalidated, which will cause a lot of application services (such as telephone banking) in WCDMA, CDMA2000 LMSD/MMD, Time Division Synchronous Code Division Multiple Access (TDSCDMA), etc It cannot be applied in the network.

Therefore, for the CDMA network under the network structure of separation of all IP and bearer control, how to realize the reliable sending method of user input DTMF information under the current network structure of separation of all IP and bearer control is a realistic problem that must be solved urgently.

Contents of the invention

In view of this, the main purpose of the present invention is to propose a method for transmitting DTMF information in a CDMA system, so as to reliably transmit DTMF information under the network structure of separation of IP and bearer control.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

A method for transmitting DTMF information in a CDMA system, the method comprising:

A. The calling party and the called party establish a communication connection;

B. The calling party carries the DTMF information in the signaling, and transmits the signaling carrying the DTMF information to the called party, and the called party acquires the DTMF information from the signaling carrying the DTMF information.

The calling party is a mobile communication network terminal, and the called party is a fixed communication network terminal, wherein step B includes:

B11, the calling BSS carries the DTMF information in the signaling, and sends the signaling to the calling MSCe;

B12, the calling MSCe sends the signaling carrying the DTMF information to the called MSCe;

B13. The called MSCe parses out the DTMF information, and sends the DTMF information to the fixed communication network.

The calling party is a fixed communication network terminal, and the called party is a mobile communication network terminal, wherein step B includes:

B21. The calling MSCe carries the DTMF information in the signaling, and sends the signaling carrying the DTMF information to the called MSCe.

B22. The called MSCe sends the signaling to the called BSS, and the called BSS parses out the DTMF information, and sends the DTMF information to the mobile communication network.

The calling party is a mobile communication network terminal A, and the called party is a mobile communication network terminal B, wherein step B includes:

B31, the calling BSS carries the DTMF information in the signaling, and sends the signaling to the calling MSCe;

B32, the calling MSCe sends the signaling carrying the DTMF information to the called MSCe;

B33. The called MSCe sends the signaling to the called BSS, and the called BSS parses out the DTMF information.

The fixed communication network is a Next Generation Network (NGN) or a Public Switched Telephone Network (PSTN) or an Integrated Services Network (ISDN).

In step B12, the calling MSCe sends the signaling to the called MSCe as follows: the calling MSCe carries the signaling in an OPTION message and sends it to the called MSCe.

In step B21, the calling MSCe sends the signaling to the called MSCe as follows: the calling MSCe carries the signaling in an OPTION message and sends it to the called MSCe.

In step B31, the calling MSCe sends the signaling to the called MSCe as follows: the calling MSCe carries the signaling in an OPTION message and sends it to the called MSCe.

The method further includes, when the button is released in step B, the calling party carries the button release information in another signaling, and transmits the signaling carrying the button release information to the called party, and the called party starts from the The key release information is obtained from the signaling carrying the key release information.

The CDMA system is: wideband code division multiple access (WCDMA) system, CDMA2000 system, time division synchronous code division multiple access (TDS-CDMA) system.

As can be seen from the foregoing technical solutions, in the present invention, after the calling party and the called party establish a communication connection, the calling party carries the DTMF information in the signaling, and transmits the signaling carrying the DTMF information to the called party, Then the called party obtains the DTMF information from the signaling carrying the DTMF information. It can be seen that the present invention transmits DTMF through signaling transmission, rather than compressing DTMF in in-band tones for transmission, and entities such as MSCe complete the analysis of DTMF information from signaling, so when the network is IP-based and carries Under the control separation structure, the DTMF information will not be wrongly checked or invalidated, so the DTMF information can be transmitted reliably.

Description of drawings

FIG. 1 is a schematic diagram of an exemplary process for transmitting DTMF information in a CDMA system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a CDMA2000 LMSD MMD network structure according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of an exemplary process for transmitting DTMF information from a mobile communication network terminal to a fixed communication network terminal according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of an exemplary flow of transmitting DTMF information from a fixed communication network terminal to a mobile communication network terminal according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of an exemplary process for transmitting DTMF information between mobile communication network terminals according to an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

The main idea of the present invention is: at first the calling party and the called party establish communication connection; The called party obtains the DTMF information from the signaling carrying the DTMF information by the called party (such as the called party MSCe), and converts the DTMF signaling into DTMF information or directly sends the DTMF signal to the called party according to the specific situation. To avoid the distortion of DTMF signal caused by the transmission process of IP network.

FIG. 1 is a schematic diagram of an exemplary process for transmitting DTMF information in a CDMA system according to an embodiment of the present invention. As shown in Figure 1, the method includes:

Step 101: the calling party and the called party establish a communication connection.

Here, the calling party may be a fixed communication network terminal or a mobile communication network terminal. Similarly, the called party can be either a fixed communication network terminal or a mobile communication network terminal. For those skilled in the art, the process of establishing a communication connection between a calling party and a called party through a fixed communication network and/or a mobile communication network is well known. In addition, the fixed communication network can be NGN, PSTN, ISDN and so on.

Step 102: The calling party carries the DTMF information in the signaling, and transmits the signaling carrying the DTMF information to the called party, and the called party acquires the DTMF information from the signaling carrying the DTMF information.

Among them, the signaling carrying the DTMF information can be added to the A interface between the BSS and the MSCe, and the signaling carrying the DTMF information can be transmitted between the MSCes in the mobile communication network through signaling transmission, so that the fixed terminal Transmit DTMP information with and between mobile terminals. Specifically, add DTMF sending start signaling (STRAT DTMF) on the A interface between BSS and MSCe, and DTMF information is carried in the STRAT DTMF signaling. Here, it is preferable to carry the START DTMF signaling in the OPTION message of the zz interface.

In addition, the DTMF transmission end signaling (STOP DTMF) can be further added in the A interface between the BSS and MSCe, and the STOP DTMF carries the button release information. When the button is released, the calling party carries the button release information in the STOP DTMF signaling, and transmits the STOP DTMF signaling to the called party, and the called party obtains the button release information from the STOP DTMF signaling. Similarly, the STOP DTMF signaling can also be carried in the OPTION message of the zz interface here.

The present invention can be applied to various CDMA systems, including but not limited to: WCDMA system, CDMA 2000 system, TD-S CDMA system, etc.

Take CDMA 2000 as an example below to describe the present invention in detail.

FIG. 2 is a schematic diagram of a CDMA2000 LMSD MMD network structure according to an embodiment of the present invention. As shown in Figure 1, the base station controller (BSC) and MSCe communicate through the A interface, the MSCes communicate with each other through the zz interface, and the MSC communicates with fixed communication networks such as PSTN/PLMN through the TUP/ISUP interface. In the present invention, two signalings carrying user input (button) information are added in the A interface, which are respectively STRAT DTMF signaling and STOP DTMF signaling. Since the zz interface is based on the Simple Initial Protocol (SIP), START DTMF and STOP DTMF signaling can be carried in the OPTION message.

The process of transmitting DTMF information from a mobile communication network terminal to a fixed communication network terminal by applying the present invention will be described in detail below.

Fig. 3 is a schematic diagram of an exemplary flow of transmitting DTMF information from a mobile communication network terminal to a fixed communication network terminal according to an embodiment of the present invention. In this embodiment, the calling party is a mobile communication network terminal, and the called party is a fixed communication network terminal. As shown in Figure 3, the method includes the following steps:

First, the calling party sends a call request, and the calling BSS sends a call establishment request to its corresponding MSCe (that is, MSCe1), and MSCe1 replies a call establishment response to the calling BSS, and the called MSCe (MSCe2) sends a call establishment request to the fixed communication network (NGN/PSTN) etc.) to send a call establishment request, the fixed communication network replies a call establishment response to MSCe2, and then the calling party and the called party establish a connection relationship and enter a conversation state.

After entering the conversation state, when the user presses a button on the calling mobile terminal, the calling mobile terminal sends the generated DTMF information to the calling BSS; the calling BSS then sends START DTMF signaling to MSCe1, wherein the START DTMF signaling carries the DTMF information of the calling terminal; then MSCe1 packs the valid content of the START DTMF signaling into the OPTION message, generates an OPTION with START DTMF message, and sends the OPTION with START DTMF message to MSCe 2 via the multimedia gateway MGW, and then MSCe2 parses out the DTMF information in the OPTION withSTART DTMF message, and then converts the DTMF information into an in-band tone and transmits it to the fixed communication network. It can be seen that the transmission between MGWs is IP.

After receiving the OPTION with START DTMF message, MSCe2 returns an acknowledgment message (OPTION with START DTMF ACK) to MSCe1, and MSCe1 also returns an acknowledgment message (START DTMF ACK) to the calling BSS.

When the user releases the button on the calling mobile terminal, the calling mobile terminal sends the generated button release information to the calling BSS; the calling BSS then sends STOP DTMF signaling to MSCe1, wherein the STOP DTMF signaling carries The key release information of the calling terminal; then MSCe1 packs the effective content of the STOPDTMF signaling into the OPTION message, generates an OPTION with STOPDTMF message, and sends the OPTION with STOP DTMF message to MSCe2 via the multimedia gateway MGW, where it can be seen that the MGW For IP transport.

After receiving the OPTION with STOP DTMF message, MSCe2 returns an acknowledgment message (OPTION with STOP DTMF ACK) to MSCe1, and MSCe1 also returns an acknowledgment message (STOP DTMF ACK) to the calling BSS.

The process of transmitting DTMF information from a fixed communication network terminal to a mobile communication network terminal by applying the present invention will be described in detail below.

Fig. 4 is an exemplary flow diagram of transmitting DTMF information from a fixed communication network terminal to a mobile communication network terminal according to an embodiment of the present invention, wherein the calling party is a fixed communication network terminal, and the called party is a mobile communication network terminal.

First, the calling party sends a call request, and the fixed communication network sends a call establishment request to its corresponding MSCe (that is, MSCe1) through the ISUP interface. The BSS sends a call establishment request, and the BSS replies a call establishment response to MSCe2, and then the calling party and the called party establish a connection relationship and enter a conversation state.

After entering the conversation state, when the user presses a button on the calling fixed communication network terminal, the calling fixed communication network terminal will send the generated DTMF information to the calling MSCe (MSCe1) through the fixed communication network (NGN/PSTN, etc.); MSCe1 carries the DTMF information in the START DTMF signaling, packs the START DTMF signaling in the OPTION message, generates the OPTION withSTART DTMF message, and then sends the OPTION with START DTMF message to MSCe 2; MSCe 2 sends the OPTION with START DTMF message The START DTMF signaling in the message is parsed out, and the START DTMF signaling is sent to the BSS, and the BSS obtains the DTMF message in the START DTMF signaling, in which IP transmission is used between MGWs during the transmission process.

After receiving the OPTION with START DTMF message, MSCe 2 returns an acknowledgment message (OPTION with START DTMF ACK) to MSCe1, and MSCe1 also returns an acknowledgment message (START DTMF ACK) to the calling BSS.

When the user releases the button on the calling mobile terminal, the calling fixed terminal sends the generated button release information to the calling MSCe; MSCe1 carries the button release information in the STOP DTMF signaling, and sends the STOP DTMF signaling Packed in the OPTION message, generate the OPTION with STOP DTMF message, and then send the OPTION with STOP DTMF message to MSCe 2; MSCe2 parses the STOP DTMF signaling in the OPTION with STOP DTMF message, and sends the STOP DTMF signaling to the BSS, The BSS then obtains the button release information in the STOP DTMF signaling, and the MGWs are IP-transmitted during the transmission process.

MSCe 2 returns an acknowledgment message (OPTION with STOP DTMF ACK) to MSCe1 after receiving the OPTION with STOP DTMF message, and MSCe1 returns an acknowledgment message (STOP DTMF ACK) to the calling BSS in the same way.

The process of applying the present invention to transmit DTMF information between mobile communication network terminals will be described in detail below.

FIG. 5 is a schematic diagram of an exemplary flow of transmitting DTMF information from a fixed communication network terminal to a mobile communication network terminal according to an embodiment of the present invention, wherein the calling party is mobile communication network terminal A, and the called party is mobile communication network terminal B.

First, the calling party sends out a call request, and the calling BSS (BSS1) sends a call setup request to its corresponding MSCe (that is, MSCe1), and MSCe1 replies a call setup response to the calling BSS, and the called MSCe (MSCe2) sends a call setup request to the called BSS ( BSS2) sends a call establishment request, and the called BSS replies a call establishment response to MSCe2, and then the calling party and the called party establish a connection relationship and enter a conversation state.

After entering the conversation state, when the user presses a button on the calling terminal, the calling terminal sends the generated DTMF information to the calling MSCe (MSCe1); MSCe1 then sends START DTMF signaling to MSCe2, wherein the START DTMF signaling Carries the DTMF information of the calling terminal; then MSCe 2 packages the effective content of the START DTMF signaling in the OPTION message, generates an OPTION with START DTMF message, and sends the OPTION with START DTMF message to BSS2 via the multimedia gateway MGW, where IP transmission is used between MGWs.

After receiving the OPTION with START DTMF message, MSCe 2 returns an acknowledgment message (OPTION with START DTMF ACK) to MSCe1, and MSCe1 also returns an acknowledgment message (START DTMF ACK) to the calling BSS.

When the user releases the button on the calling mobile terminal, the calling mobile terminal sends the generated button release information to the calling BSS (BSS1); the calling BSS (BSS1) then sends STOP DTMF signaling to MSCe1, wherein STOP The DTMF signaling carries the button release information of the calling terminal; then MSCe1 packs the effective content of the STOP DTMF signaling into the OPTION message, generates an OPTION with STOP DTMF message, and sends the OPTION with STOP DTMF message via the multimedia gateway MGW To MSCe2, where IP transmission is used between MGWs.

After receiving the OPTION with STOP DTMF message, MSCe2 returns an acknowledgment message (OPTION with STOP DTMF ACK) to MSCe1, and MSCe1 also returns an acknowledgment message (STOP DTMF ACK) to the calling BSS.

Those skilled in the art can realize that the present invention includes but is not limited to WCDMA system, CDMA 2000 system, TD-S CDMA system and other systems, and is especially suitable for CDMA network structure with separation of IP and bearer control.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1, a kind of method that transmits dual tone multi-frequency dtmf information in CDMA systems is characterized in that this method comprises:

A, caller and called establishing a communications link;

B, caller are carried at DTMF information in the signaling, and this signaling that carries DTMF information are sent to called, calledly obtain described DTMF information from this carries the signaling of DTMF information.

2, according to the described method that transmits DTMF information in cdma system of claim 1, it is characterized in that described caller is the mobile communications network terminal, called is the fixed communication network terminal, and wherein step B comprises:

B11, caller base station sub-system BSS are carried at DTMF information in the signaling, and this signaling is sent to the analog machine MSCe of caller second generation mobile switching centre;

B12, caller MSCe send to called MS Ce with this signaling that carries DTMF information;

B13, called MS Ce parse DTMF information, and described DTMF information is sent to fixed communication network.

3, according to the described method that transmits DTMF information in cdma system of claim 1, it is characterized in that described caller is the fixed communication network terminal, called is the mobile communications network terminal, and wherein step B comprises:

B21, caller MSCe are carried at DTMF information in the signaling, and this signaling that carries DTMF information is sent to called MS Ce.

B22, called MS Ce send to called BSS with this signaling, and called BSS parses DTMF information, and described DTMF information is sent to mobile communications network.

4, according to the described method that transmits DTMF information in cdma system of claim 1, it is characterized in that described caller is mobile communications network terminal A, called is mobile communications network terminal B, and wherein step B comprises:

B31, caller BSS are carried at DTMF information in the signaling, and this signaling is sent to caller MSCe;

B32, caller MSCe send to called MS Ce with this signaling that carries DTMF information;

B33, called MS Ce send to called BSS with this signaling, and called BSS parses described DTMF information.

5, according to claim 2 or the 3 described methods that in cdma system, transmit DTMF information, it is characterized in that described fixed communication network is next generation network NGN or public switched telephone network PSTN or integrated services network ISDN.

6, according to the described method that transmits DTMF information in cdma system of claim 2, it is characterized in that the described caller MSCe of step B12 sends to called MS Ce with this signaling and is: caller MSCe is carried at this signaling and sends to called MS Ce in the OPTION message.

7, according to the described method that transmits DTMF information in cdma system of claim 3, it is characterized in that the described caller MSCe of step B21 sends to called MS Ce with this signaling and is: caller MSCe is carried at this signaling and sends to called MS Ce in the OPTION message.

8, according to the described method that transmits DTMF information in cdma system of claim 4, it is characterized in that the described caller MSCe of step B31 sends to called MS Ce with this signaling and is: caller MSCe is carried at this signaling and sends to called MS Ce in the OPTION message.

9, according to the described method that in cdma system, transmits DTMF information of claim 1, it is characterized in that, this method further comprises, among the step B when button unclamps, caller is carried at the button information of unclamping in another signaling, and this is carried signaling that button unclamps information be sent to calledly, calledly carry button from this and unclamp and obtain described button the signaling of information and unclamp information.

10, according to each described method that in cdma system, transmits DTMF information among the claim 1-9, it is characterized in that described cdma system is: Wideband Code Division Multiple Access (WCDMA) WCDMA system, CDMA2000 system, TD SDMA TDS-CDMA system.

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