CN101296205B - Method, equipment and system for implementing transparent transmission in IP network or hybrid network - Google Patents

Abstract

A method, device, and system for realizing transparent transmission in an IP network or a hybrid network, comprising: in an IP network, after receiving information sent by a transparent transmission method, a network device uses an IP-based transparent transmission method to send In the mixed network including IP network and TDM network, the network equipment connected between IP network and TDM network receives the information that needs to be transparently transmitted, then the information received is based on The conversion processing between the transparent transmission method of IP and the induced transmission method of the backbone TDM, and the information after the conversion processing is transmitted. Therefore, in the present invention, there is no need to pay attention to the content of the transmitted information, and the information is directly forwarded, so that the information such as encrypted words to be sent will not be damaged. That is, the implementation of the embodiments of the present invention enables transparent transmission of end-to-end service information in an IP network or a hybrid network including an IP network.

Description

Method, device and system for realizing transparent transmission in IP network or hybrid network

technical field

The invention relates to the field of communication technology, in particular to a technology for realizing transparent transmission in a network.

Background technique

In the communication system, there are some end-to-end special services, such as circuit data services, end-to-end encrypted voice services, etc. These services are end-to-end information transmission between two parties, and the intermediate transmission equipment cannot modify its content, otherwise It may cause the end-to-end communication information to be destroyed and communication cannot be performed.

In a traditional core network based on TDM (Time Division Multiplexing), since data is transmitted specifically through physical circuit switching, it can realize transparent transmission of data.

With the development of the network, the core network is also gradually evolving to the next generation, that is, the application scenarios of IP networking and IP and TDM hybrid networking gradually appear.

In the IP network, due to the adoption of various compression codec technologies, the network is no longer transparent to the transmitted information. That is to say, in the data transmission process based on the IP network, the network needs to realize the conversion of various codecs. In this way, for services such as end-to-end encrypted calls, since the information transmitted is encrypted, the codec cannot be identified. If the codec conversion process is performed on such service information, the corresponding encrypted information will be destroyed. As a result, the peer cannot decode correctly.

Therefore, transparent transmission of end-to-end service information cannot be realized in the application scenarios of IP networking or IP and TDM hybrid networking at present.

Contents of the invention

Embodiments of the present invention provide a method, device and system for realizing transparent transmission in an IP network or a hybrid network, so that transparent transmission of end-to-end service information can be realized in an IP-based network.

An embodiment of the present invention provides a method for realizing transparent transmission in a hybrid network, including:

In a hybrid network including an IP network and a time-division multiplexed TDM network, network devices connected between the IP network and the TDM network receive information that needs to be transparently transmitted;

Perform conversion processing between the IP-based transparent transmission mode and the TDM-based transparent transmission mode for the received information, and transmit the converted information;

Among them, it also includes a step for the network device to determine that the received information needs to be transmitted in a transparent transmission manner, and the step includes:

The network device receives the transparent transmission instruction, and determines according to the transparent transmission instruction that the network device needs to use transparent transmission to transmit information;

or,

After the network device detects and identifies the information sent through the transparent transmission method, it is determined that the network device needs to use the transparent transmission method to transmit information;

or,

After the network device detects and recognizes the information sent through the transparent transmission method, it requests the control device to determine whether to allow the transparent transmission method. If the control device allows it, it is determined that the network device needs to use the transparent transmission method to transmit information.

An embodiment of the present invention provides a network device, which is connected between an IP network and a TDM network, and specifically includes:

an information receiving unit, configured to receive information that needs to be transparently transmitted;

A transparent transmission mode conversion processing unit, configured to convert the information received by the information receiving unit between an IP-based transparent transmission mode and a TDM-based transparent transmission mode;

An information sending unit, configured to transmit the information converted and processed by the transparent transmission mode conversion processing unit;

The network equipment also includes:

The first transparent transmission determining unit is configured to receive a transparent transmission indication, and determine according to the transparent transmission indication that the network device needs to use transparent transmission to transmit information; or,

The second transparent transmission determining unit is configured to determine that transparent transmission needs to be used for information transmission after detecting and identifying the information sent through transparent transmission.

An embodiment of the present invention provides a system for realizing transparent transmission in a hybrid network. The system is set in a hybrid network including an IP network and a TDM network, and specifically includes:

At least one first network device, set in a TDM network or an IP network, for transmitting information in a transparent transmission manner;

At least one second network device, connected between the IP network and the TDM network, used for information that needs to be transparently transmitted from the first network device or other second network devices, and based on the received information Conversion processing between IP transparent transmission mode and TDM-based transparent transmission mode, and transmission of converted information;

The second network device also includes:

The first transparent transmission determining unit is configured to receive a transparent transmission indication, and determine according to the transparent transmission indication that the network device needs to use transparent transmission to transmit information; or,

The second transparent transmission determining unit is configured to determine that transparent transmission needs to be used for information transmission after detecting and identifying the meter information sent through transparent transmission.

An embodiment of the present invention provides a method for realizing transparent transmission detection in a hybrid network. The hybrid network includes an IP network and a TDM network. In the TDM network, an ISLP-based transmission mode is used as a transparent transmission mode for information transmission, and the transparent transmission The detection process specifically includes:

The network equipment connected between the IP network and the TDM network receives the information sent by the TDM network;

Checking a group of continuous information frames received, if it is determined that the group of continuous information frames contains a predetermined number of 0x7E filling symbols, it is confirmed that the ISLP frame is detected.

An embodiment of the present invention provides a method for realizing transparent transmission in an IP network, including:

In the IP bearer network, establish an end-to-end bearer channel;

After the media gateway and/or wireless access device passing through the bearer channel receives the information that needs to be transmitted in a transparent transmission mode, the received information is transmitted in the IP bearer network in an IP-based transparent transmission mode ;

Among them, also include:

The media gateway and/or the wireless access device receives a transparent transmission indication, and determines that information needs to be transmitted in a transparent transmission manner according to the transparent transmission indication;

or,

After the media gateway and/or the wireless access device receives the information that the codec type transmitted through the bearer channel is the transparent transmission mode, it determines that the transparent transmission mode needs to be used for information transmission.

An embodiment of the present invention provides a network device, which is a media gateway or a wireless access device, and the network device includes:

An information receiving unit, configured to receive information that needs to be transmitted in a transparent transmission manner;

A transparent transmission processing unit, configured to process the information received by the information receiving unit in an IP-based transparent transmission manner;

an information sending unit, configured to send the information processed by the transparent transmission processing unit;

The network equipment also includes:

A transparent transmission instruction acquisition unit, configured to receive a transparent transmission instruction sent by other network devices or control devices, determine that the network device needs to use transparent transmission to transmit information according to the transparent transmission instruction, and notify the transparent transmission processing unit .

An embodiment of the present invention provides a control device, including:

A transparent transmission mode determining unit, configured to determine that a transparent transmission mode needs to be implemented according to the received message from the network device;

The second transparent transmission mode notification unit is used to send a notification to the network equipment passed through the information transmission process after the transparent transmission mode determines that the transparent transmission mode needs to be implemented, so as to instruct the network device to receive the information that needs to be transmitted by transparent transmission mode. After receiving the information, the received information is transmitted in an IP-based transparent transmission manner.

It can be seen from the above-mentioned technical solutions provided by the embodiments of the present invention that because the equipment in the IP network, or the equipment in the mixed network composed of the IP network and the TDM network can know that it needs to use transparent transmission to transmit information, and It can be switched to the corresponding transparent transmission state, so that in the IP network, or in the mixed network composed of IP network and TDM network, information transmission can still be carried out after the bearer plane is switched to the transparent transmission mode, that is, Realize the transparent transmission of end-to-end business information.

Description of drawings

FIG. 1 is a schematic diagram of a specific application implementation process of an embodiment of the present invention in a hybrid network;

FIG. 2 is a schematic diagram 2 of a specific application implementation process of an embodiment of the present invention in a hybrid network;

FIG. 3 is a schematic diagram of a process for transferring transparent transmission instructions between MSCs in an embodiment of the present invention;

FIG. 4 is a schematic diagram 3 of a specific application implementation process of an embodiment of the present invention in a hybrid network;

Figure 5 is a schematic diagram of the implementation process of the specific application of the embodiment of the present invention in a hybrid network IV

FIG. 6 is a schematic diagram of an expanded APP message format in an embodiment of the present invention;

FIG. 7 is a schematic diagram of an IP-based network networking structure in an embodiment of the present invention;

FIG. 8 is a schematic diagram of a message format of an extended event parameter in an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a hybrid network system and equipment provided by an embodiment of the present invention;

FIG. 10 is a schematic diagram of a specific application implementation process in an IP network according to an embodiment of the present invention;

FIG. 11A and FIG. 11B are the second schematic diagram of the implementation process of the specific application in the IP network of the embodiment of the present invention;

FIG. 12 is a schematic diagram 3 of a specific application implementation process in an IP network according to an embodiment of the present invention;

Fig. 13 is a schematic structural diagram of a device provided by an embodiment of the present invention.

Detailed ways

The embodiment of the present invention provides a technical solution for realizing transparent transmission in an IP-based network, which includes: in the IP network, the device responsible for information transmission processing receives the information sent by other devices using transparent transmission After the transmission instruction, the information sent by the information sender is sent in a transparent transmission mode, that is, there is no need to pay attention to the content of the transmitted information, and the information is directly forwarded without encoding and decoding the information, so that the encrypted business and other information to be sent will not be damaged.

Specifically speaking, in a specific embodiment, the process of realizing transparent transmission in a hybrid network mainly includes: first, in a hybrid network including an IP network and a TDM (time division multiplexing) network, an information sending terminal and an information receiving terminal are established. Afterwards, after the network device connected between the IP network and the TDM network via the bearer channel receives the information that needs to be transparently transmitted, the received information is transparently transmitted based on IP and based on Conversion processing between transparent transmission modes of TDM; finally, information after conversion processing is transmitted.

In the embodiment of the present invention, on the network device connected between the IP network and the TDM network through which the bearer channel passes, it is necessary to determine that information transmission needs to be carried out in a transparent transmission mode, and the corresponding determination needs to be carried out in a transparent transmission mode. The way of information transfer may be: the network device receives a message sent by other devices or control devices on the bearer channel, and the message contains a transparent transmission indication, then it is determined that transparent transmission is required for information transmission. or, after the network device detects and recognizes the information sent through transparent transmission, it is determined that the network device needs to use transparent transmission to transmit information; or, the network device detects and recognizes that the information sent through transparent transmission After receiving the information, it may also request the control device to determine whether to allow the transparent transmission method, and if the control device allows it, determine that the network device needs to use the transparent transmission method to transmit information.

Wherein, the process for the control device to send the message containing the transparent transmission indication may specifically include any of the following methods:

Mode 1: The control device receives a transparent transmission instruction from other devices that needs to switch to the transparent transmission mode, and then it can determine that the transparent transmission mode needs to be used for information transmission. For example, the MSC (Mobile Switching Center) as the control device receives the received Incoming equipment BSC (base station controller) sends a message, indicating that the message needs to be switched to a transparent transmission mode, etc.;

Method 2: In the process of establishing the voice channel (ie, the bearer channel), the control device determines that the transparent transmission mode is allowed, and then it can be determined that the transparent transmission mode is currently required for information transmission.

Moreover, the sending of the message containing the transparent transmission indication by the control device may specifically be: setting the codec type of the transparent transmission mode as the transparent transmission indication in the message of adding an endpoint or modifying the endpoint, and sending the message, In order to notify other network devices of the transparent transmission indication.

In the embodiment of the present invention, the specific implementation manner for the network device to detect and identify the information sent through transparent transmission may be as follows:

The network device receives information sent by other devices on the bearer channel; if the codec type of the sent information is transparent transmission, or, according to the format or content of the received information, it is determined that the information is sent by transparent transmission, then Confirm that the detection identifies the information sent through the transparent transmission mode.

In the embodiment of the present invention, an IP-based transparent transmission mode is specifically adopted in the IP network for transparent transmission of information, and the ways of sending information from other devices on the bearer channel include but are not limited to: extending TrFO (without Encoder running) message, or, extended RTCP (Real-time Transport Control Protocol) message, or, extended RFC 2833 (RFC, request for annotation) standard message, or, extended TFO message (such as extended codec type: transparent transmission mode), in order to carry the corresponding transparent transmission instruction through each extended message, and instruct to execute the corresponding transparent transmission mode for information transmission, so as to realize the negotiation process of the transparent transmission mode;

Moreover, in the embodiment of the present invention, a TDM-based transparent transmission method can be used in a TDM network, and the TDM-based transparent transmission method includes but is not limited to: ISLP (Intersystem Link Protocol) transmission method or TFO (no tandem operation) transmission mode.

Through the technical solutions provided by the above embodiments of the present invention, end-to-end transparent transmission can be realized in an IP-based network. Therefore, the implementation of the embodiments of the present invention can ensure that a transparent transmission channel can still be provided in an IP network or a mixed network of IP and TDM for transparent transmission of information.

In order to facilitate the understanding of the embodiments of the present invention, the specific application embodiments of the embodiments of the present invention will be described in detail below by taking an IP and TDM hybrid network and using ISLP (Inter-System Link Protocol) frames for transparent transmission in the TDM network as an example. illustrate.

In this application example, after the MGW detects the indication of voice switching transparent transmission on the bearer plane, it can notify the MSCe (Mobile Soft Switch Center), and then the MSCe instructs the MGW to switch to the transparent transmission mode. After the air interface is switched to the transparent transmission mode, the BSC can notify the MSCe through out-of-band signaling (such as a switching message), or notify the MSCe through other methods.

Application Embodiment 1 in Hybrid Network

In an IP and TDM hybrid network, the corresponding information transmission process is shown in Figure 1, which specifically includes the following steps:

Step 1, IP-based BSC (base station controller) sends a call setup request to control equipment MSCe1 (soft mobile switching center 1);

Step 2: After MSCe1 receives the call establishment request, if it is determined that transparent transmission is allowed, then the codec of UDTD (User Data Transparent Deliver, transparent transmission) is carried in the ADD command sent to the media gateway MGW1 for adding endpoint information Type, to inform MGW1 to use transparent transmission to transmit the received information whose codec type is UDTD, and to detect whether the information sent by MGW2 is an ISLP frame;

After the MSCe1 sends the codec type UDTD to the media gateway MGW1 as a transparent transmission indication, MGW1 can determine to use the transparent transmission mode for information transmission according to the transparent transmission indication, including determining according to the transparent transmission indication that when predetermined conditions are met (such as detecting To the transparent transmission frame, etc.), the transparent transmission method is implemented;

The parameter carried by the assignment message sent by MSCe1 to the IP-based BSC includes UDTD, so that the IP-based BSC can perform transparent transmission according to the UDTD;

Step 3, MSCe1 also performs information interaction with MSCe2 (soft mobile switching center 2), and after the MSCe2 confirms that transparent transmission is allowed, it carries the UDTD in the information delivered to MGW2, so as to notify MGW2 of the received coded The information whose decoding type is UDTD is transmitted in a transparent transmission mode, and detects whether the information sent by MGW1 is an ISLP frame;

Through the processing of the above steps 1 to 3, the voice channel between the information sending end and the information receiving end is established, after that, the process of using the voice channel to transmit the audio information is as follows:

Step 4, between the IP-based BSC and MGW1, and MGW2 both use the EVRC (Enhanced Variable Rate Codec, Enhanced Variable Rate Codec) codec bearer mode, that is, EVRC PT (the codec type is EVRC) for voice transmission , voice transmission is performed between MGW1 and MGW2 using TDM-based G7.11 mode;

Specifically, it can be as follows: after entering the two-party conversation, use the EVRC mode to communicate on the established IP-based voice channel, use TDM G.711 transmission on the TDM channel, and the MGW1 realizes IP voice codec and TDM G.711 codec conversion;

Step 5, on the IP-based BSC at the information sending end, it is determined that the information transmitted to the current voice channel is switched to a transparent transmission mode;

Specifically, the information sending end (such as user terminal equipment, etc.) can initiate the switching from voice to transparent transmission, and the IP-based BSC conducts service negotiation with the information sending end. The terminal uses UDTD to communicate with MGW1, and the codec type is UDTD during the communication process;

Step 6, information exchange is performed between the IP-based BSC and MGW1 in a transparent transmission manner;

The process of transmitting information from the IP-based BSC to MGW1 may be as follows: After the IP-based BSC receives the information that needs to be transparently transmitted (such as encrypted voice, etc.) sent by the information sender, it uses UDTD to transmit the information. That is, the codec type of the transmitted information is UDTD;

The process of transmitting information from MGW1 to IP-based BSC can be as follows: After MGW1 determines that the endpoint type on one side is TDM and the endpoint type on the other side is IP and contains UDTD, it starts the detection of ISLP frames, and sends information to the IP-based BSC after receiving After sending the ISLP frame, transfer the information carried by the ISLP frame to the IP-based BSC in UDTD mode;

In this step, the implementation of the corresponding ISLP frame detection can be as follows: According to the characteristics of the ISLP frame, there are a large number of 0x7E filling symbols (such as 50) in an ISLP frame. When multiple frames (such as 2 ) when there are a large number of 0x7E symbols, it can be confirmed that the ISLP frame is detected;

Step 7, MGW1 and MGW2 use transparent transmission to exchange information;

Specifically, after MGW1 and MGW2 receive the information, if they detect that the codec type of the information is UDTD, they switch to the transparent transmission mode, that is, use ISLP frames for information exchange;

Step 8, MGW2 uses transparent transmission to send the received information to the information receiving end, and receives the information that needs to be transparently transmitted returned by the information receiving end;

The process of MGW2 sending information to the information receiving end can be as follows: MGW2 finds that the end point type on one side of itself is TDM and the end point type on the other side is IP and contains UDTD, then starts the detection of ISLP frame, and adopts transparent transmission mode for the detected ISLP frame (that is, UDTD) sent to the information receiving end, that is, after MGW2 detects that the transmission on the TDM is an ISLP frame instead of a G.711 frame, it determines that the switching from voice to transparent transmission occurs, and transmits the UDTD frame and the decoding type on the IP channel UDTD;

The process that MGW2 receives the information and returns it from the information receiving end to the information sending end needs to be transparently transmitted. Specifically, if the information received by MGW2 is transmitted by using the codec type UDTD, then the information needs to be transmitted by transparent transmission. .

In the above process, since the endpoint types on both sides of MGW1 and MGW2 are TDM on one side and IP based on transparent transmission on the other side, MGW1 and MGW2 need to implement IP-based transparency Conversion processing between the transmission mode and the TDM-based transparent transmission mode (such as the ISLP frame transmission mode, etc.).

However, in the above processing process, if the endpoints on both sides of MGW1, or MGW2, or other MGWs between MGW1 and MGW2 are IP or TDM, then the received codec type is UDTD information or ISLP frames are forwarded without processing.

Application Embodiment 2 in Hybrid Network

In an IP and TDM hybrid network, the corresponding information transmission process is shown in Figure 2, which specifically includes the following steps:

Step 1, during the process of establishing a voice channel between the information sending end and the information receiving end, the control device MSCe2 at the information receiving end notifies the device connected to it to perform an ISLP detection operation;

Specifically, when MSCe2 establishes a TDM endpoint, it finds that it is adjacent to an IP endpoint and allows transparent transmission, then includes an ISLP detection indication in the ADD command sent to MGW2 to instruct MGW2 to perform an ISLP detection operation; in this step , other commands or messages may also be used to transmit the ISLP detection indication to MGW2;

Step 2, after establishing the voice channel, transmit voice information between the IP-based BSC and MGW2;

At this time, the transparent transmission process has not yet been performed, and the specific voice information transmission process can be: the EVRC codec method is used for voice transmission between the IP-based BSC and MGW1, and the TDM-based G.711 standard is used between MGW1 and MGW2 For voice transmission, the EVRC codec is used for voice transmission between MGW2 and the information receiving end;

Step 3, on the IP-based BSC at the information sending end, it is determined that the information transmitted through the current voice channel is switched to a transparent transmission mode, that is, the information transmission is performed under the encrypted ISLP transmission mode;

Specifically, the information sending end (such as user terminal equipment, etc.) can initiate the switching from voice to transparent transmission, and the IP-based BSC conducts service negotiation with the information sending end. The terminal uses UDTD to communicate with MGW1, and the codec type is UDTD during the communication process;

Step 4, the IP-based BSC sends a bearer update request to MGW1, requesting MSCe1 to perform codec type update operations;

Step 5, after MSCe1 receives the request, update the codec type of MGW1 connected to it to UDTD, start the detection of ISLP frame, and update the codec type of IP-based BSC;

Specifically, the codec type can be changed through the MOD (modification) message, or the codec type can also be modified through other commands or messages;

Step 6, UDTD is used to transmit voice information between the IP-based BSC and MGW1, and the codec type in the transmission process is marked as UDTD;

The process of transmitting information from the IP-based BSC to MGW1 may be as follows: After the IP-based BSC receives the information that needs to be transparently transmitted (such as encrypted voice, etc.) sent by the information sender, it uses UDTD to transmit the information. That is, the codec type of the transmitted information is UDTD;

The process of transmitting information from MGW1 to IP-based BSC can be as follows: After MGW1 determines that the endpoint type on one side is TDM and the endpoint type on the other side is IP and contains UDTD, it starts the detection of ISLP frames, and sends information to the IP-based BSC after receiving After sending the ISLP frame, transfer the information carried by the ISLP frame to the IP-based BSC in UDTD mode;

In this step, the implementation of the corresponding ISLP frame detection can be as follows: according to the characteristics of the ISLP frame, there are a large number of 0x7E filling symbols (such as 50) in an ISLP frame, when multiple frames (such as 2) are continuously detected When there are a large number of 0x7E symbols in the frame, it can be confirmed that the ISLP frame is detected;

Step 7, MGW1 and MGW2 use transparent transmission to exchange information;

Specifically, after MGW1 and MGW2 receive the information, if they detect that the codec type of the information is UDTD, they switch to the transparent transmission mode, that is, use ISLP frames for information exchange;

Step 8, MGW2 uses transparent transmission to send the received information to the information receiving end, and receives the information that needs to be transparently transmitted returned by the information receiving end;

In this step, after MGW2 detects the ISLP frame sent by MGW1 for the first time, that is, MGW2 detects that the ISLP frame transmitted on TDM is not a G.711 frame, then it is determined that the switching from voice to transparent transmission occurs, and the ISLP event needs to be Notify MSCe2, after MSCe2 receives the notification (that is, the notification of switching to the transparent transmission mode), modify the codec type of MGW2 in the IP network to UDTD, so that MGW2 can use UDTD to send the received ISLP frame To the information receiving end in the IP network;

In this step, it also includes: MGW2 receives the process of transparent transmission from the receiving end of the information to the sending end of the information. If the information received by MGW2 is transmitted in the form of codec type UDTD, the information needs to be transmitted using The transparent transmission mode is passed to MGW1.

In the above process, since the endpoint types on both sides of MGW1 and MGW2 are TDM on one side and IP based on transparent transmission on the other side, MGW1 and MGW2 need to implement IP-based transparency Conversion processing between the transmission mode and the TDM-based transparent transmission mode (such as the ISLP frame transmission mode, etc.).

However, in the above processing process, if the endpoints on both sides of MGW1, or MGW2, or other MGWs between MGW1 and MGW2 are IP or TDM, then the received codec type is UDTD information or ISLP frames are forwarded without processing.

In the above process, if inter-office IP transmission is required, the MSCe and MSCe can notify the opposite end of the transparent transmission mode through commands such as SIP signaling; for example, in the above process shown in Figure 2, if MGW2 It is also necessary to continue to exchange information with MGW3 through transparent transmission, as shown in Figure 3, and the corresponding processing includes:

Step 1, after MSCe2 finds that voice information needs to be transmitted transparently, then notify MSCe3, and include UDTD in the notification message;

Specifically, the MSCe3 can be notified through a SIP INVITE (session initiation protocol invite) message;

Step 2. After receiving the notification, the MSCe notifies the MGW3 to change the codec type to UDTD, so as to transmit encrypted information such as voice in a transparent transmission manner.

In addition, it should be noted that, in the above two specific application embodiments, after the BSC and MGW find that the transparent transmission mode is currently switched according to the received codec type, they can automatically switch to the transparent transmission state to adopt the transparent transmission mode. way of information transmission.

Application Embodiment Three in Hybrid Network

As shown in Figure 4, in this embodiment, the BSC based on TDM initiates the end-to-end service, and at this moment, the corresponding processing procedure specifically includes the following steps:

Step 1, the TDM-based BSC sends a call setup request to the control device MSCe1;

Step 2: After MSCe1 receives the call setup request, it exchanges information with MGW1 to add an endpoint; it also assigns a TDM-based BSC, and after completing the assignment operation, execute step 3 ;

Step 3. On MSCe1, if it is determined that the TDM-based BSC allows transparent transmission, the ADD command sent to the media gateway MGW1 for adding endpoint information carries the codec type of UDTD to notify MGW1 of the received codec The information of the type UDTD is transmitted in a transparent transmission mode, and it is detected whether the information sent by MGW2 is an ISLP frame;

Step 4: MSCe1 also performs information exchange with MSCe2. After the MSCe2 confirms that transparent transmission is allowed, it carries the UDTD in the information transmitted to MGW2, so as to notify MGW2 to adopt the UDTD codec type for the received information. Transmit in transparent transmission mode, and detect whether the information sent by MGW1 is an ISLP frame;

Specifically, MSCe1 notifies MSCe2 through the extended SIP message bearing the codec type of UDTD, so that MSCe2 knows that information needs to be transmitted in a transparent transmission mode.

After the processing of the above steps 1 to 4, and after establishing the voice channel between the information sending end and the information receiving end, the voice channel will also be used to transmit voice information, still referring to the corresponding processing process shown in Figure 4 Include the following steps:

Step 5, between the TDM-based BSC and MGW1, as well as MGW2 adopt the TDM-based G7.11 mode for voice transmission, that is, perform plaintext transmission, and use EVRC PT for voice transmission between MGW1 and MGW2;

Step 6, on the TDM-based BSC at the information sending end, it is determined that the information transmitted through the current voice channel is switched to a transparent transmission mode, that is, it is determined that it is necessary to start the transmission of encrypted speech;

Specifically, it may be as follows: the information sending end (such as user terminal equipment, etc.) initiates the switching from voice to transparent transmission, and the TDM-based BSC conducts service negotiation with the information sending end. After the negotiation is successful, it is determined that the current need to switch to the transparent transmission mode;

Step 7, the TDM-based BSC and MGW1 use transparent transmission to exchange information, that is, the TDM-based BSC uses ISLP to communicate with MGW1;

The process of transmitting information from the TDM-based BSC to MGW1 may be as follows: After the TDM-based BSC receives the information that needs to be transparently transmitted (such as encrypted voice, etc.) sent by the information sender, it uses the ISLP frame to transmit the information;

The process of transmitting information from MGW1 to a TDM-based BSC can be as follows: MGW1 determines that the type of the endpoint on one side is IP and contains UDTD, and the type of the endpoint on the other side is TDM. During UDTD, use the ISLP frame to carry the received message and transmit it to the TDM-based BSC;

Step 8, MGW1 and MGW2 use EP-based transparent transmission mode for information exchange, that is, use codec type UDTD transparent transmission mode to perform information exchange between MGW1 and MGW2;

Step 9, MGW2 uses the TDM-based transparent transmission method to send the received information whose codec type is UDTD to the information receiving end, and receives the information that needs to be transparently transmitted based on the UDTD codec type returned by the information receiving end;

The process of MGW2 sending information to the information receiving end may be as follows: MGW2 receives the information transmitted in the codec type UDTD mode, and then uses TDM-based transparent transmission mode for transmission;

The transparent transmission process that MGW2 receives from the information receiving end to the information sending end can be specifically: If MGW2 finds that the end point type on one side of itself is IP and contains UDTD, and the end point type on the other side is TDM, it will start the detection of ISLP frames , and send the detected ISLP frame to MGW1 in a transparent transmission mode (that is, UDTD), that is, after MGW2 detects that the ISLP frame transmitted on the TDM is not a G.711 frame, it determines that the switching from voice to transparent transmission occurs. UDTD frame and decoding type UDTD are transmitted on the channel;.

In the above process, since the endpoint types on both sides of MGW1 and MGW2 are TDM on one side and IP based on transparent transmission on the other side, MGW1 and MGW2 need to implement IP-based transparency Conversion processing between the transmission mode and the TDM-based transparent transmission mode (such as the ISLP frame transmission mode, etc.).

However, in the above processing process, if the endpoints on both sides of MGW1, or MGW2, or other MGWs between MGW1 and MGW2 are IP or TDM, then the received codec type is UDTD information or ISLP frames are forwarded without processing.

Application Embodiment 4 in Hybrid Network

As shown in Figure 5, in this embodiment, the end-to-end service is initiated by the BSC based on TDM. It is assumed that the end connected to the BSC based on TDM is the information sending end, and the end connected to MGW2 is the information receiving end. At this time, The corresponding processing process specifically includes the following steps:

Step 1, during the process of establishing a voice channel between the information sending end and the information receiving end, the MSCe1 at the information sending end and the control device MSCe2 at the information receiving end notify the connected devices MGW1 and MGW2 to perform ISLP detection operations;

For example, the ISLP detection indication may be included in the sent ADD command to instruct MGW1 or MGW2 to perform the ISLP detection operation; in this step, other commands or messages may also be used to transmit the ISLP detection indication to MGW2;

Step 2, after establishing the voice channel, transmit voice information between the TDM-based BSC and MGW2;

At this time, the transparent transmission process has not yet been performed, and the specific voice information transmission process can be as follows: the TDM-based G.711 standard is used for voice transmission between the TDM-based BSC and MGW1, and the EVRC codec method is used between MGW1 and MGW2 For voice transmission, the G.711 standard based on TDM is used for voice transmission between MGW2 and the information receiving end;

Step 3, on the TDM-based BSC at the information sending end, it is determined that the information transmitted to the current voice channel is switched to a transparent transmission mode;

Specifically, the information sending end (such as user terminal equipment, etc.) can initiate the switching from voice to transparent transmission. The TDM-based BSC conducts service negotiation with the information sending end. The terminal communicates with MGW1 based on ISLP;

Step 4, information exchange is performed between the TDM-based BSC and MGW1 using ISLP frames;

Step 5: After receiving the ISLP frame and identifying the ISLP frame, MGW1 sends a notification of detecting an ISLP event to MSCe1;

Step 6: MSCe1 updates the codec type of MGW1 connected to it to UDTD after receiving the notification of the ISLP event;

Specifically, the codec type can be changed through the MOD (modification) message, or the codec type can also be modified through other commands or messages;

Step 7, MGW1 and MGW2 use IP-based transparent transmission to exchange information;

Specifically, after MGW1 and MGW2 receive the information, if they detect that the received information is an ISLP frame, they will use the transparent transmission method whose codec type is UDTD to transmit the information;

Step 8: MGW2 sends the received information to the information receiving end by means of TDM-based transparent transmission (such as ISLP frame), and receives the ISLP frame that needs transparent transmission returned by the information receiving end.

In the above process, since the endpoint types on both sides of MGW1 and MGW2 are TDM on one side and IP based on transparent transmission on the other side, MGW1 and MGW2 need to implement IP-based transparency Conversion processing between the transmission mode and the TDM-based transparent transmission mode (such as the ISLP frame transmission mode, etc.).

However, in the above processing process, if the endpoints on both sides of MGW1, or MGW2, or other MGWs between MGW1 and MGW2 are IP or TDM, then the received codec type is UDTD information or ISLP frames are forwarded without processing.

In addition to the above two specific application embodiments, the embodiment of the present invention can also expand RTCP and TFO technologies in the specific application process, so as to provide transparent transmission channels through bearer plane control in the case of IP and TDM hybrid networking to ensure data security. integrity.

Specific application embodiments based on extended RTCP and TFO technologies will be described below.

In this application embodiment, the APP (RTCP for application, used to indicate application-oriented function extension) message of RTCP (Real-time Transport Control Protocol) can be extended to carry the transparent transmission identification corresponding to the newly defined transparent transmission mode , so that each device in the IP network can know the currently adopted transparent transmission mode for information transmission processing.

The APP message format after the extended definition is as shown in Figure 6. In Figure 6, only a new subtype subtype (such as 0x01) and a name name (such as 1234) are defined to indicate that the bearer mode is a transparent transmission mode, and The application-dependent data (request data) part can be omitted.

The specific implementation process of this application embodiment will be described below in conjunction with the accompanying drawings, as shown in Figure 7, the corresponding processing process includes the following steps:

In the first step, after the voice channel is established between BSC1 and BSC2, a switch from clear voice to encrypted voice occurs on the BSC1 side, that is, it switches to the transparent transmission mode for voice information transmission;

In the second step, BSC1 sends an RTCP control message to MGW1 through the above-mentioned extended RTCP control protocol to indicate the need to enter the transparent transmission mode;

Step 3: After receiving the transparent transmission instruction, MGW1 enters the transparent transmission mode. When MGW1 finds that its adjacent endpoint is MGW2 based on TDM technology, it starts the TFO negotiation process on the TDM channel through MGW1;

In the fourth step, since both sides of the PSTN (traditional telephone network) are TDM circuits, only circuit switching can be performed without processing the transmitted content;

Step 5: MGW2 receives the TFO negotiation instruction sent by MGW1, and finds that the encoding and decoding mode of the opposite end is transparent transmission mode, then modifies the local IP side endpoint to enter the transparent transmission state, and starts the TFO negotiation process, between MGW1 and MGW2 The channel enters the TFO state, that is, information can be transparently transmitted between MGW1 and MGW2;

Step 6: MGW2 also continues to send RTCP control messages to MGW3 through the above-mentioned extended RTCP control protocol to instruct MGW3 to enter transparent transmission mode for information transmission;

Step 7: After receiving the instruction to enter transparent transmission, MGW3 enters the transparent transmission state, and when it finds that its adjacent endpoint is BSC2 based on TDM technology, it starts the TFO negotiation process on the TDM channel;

Step 8: BSC2 receives the TFO negotiation instruction sent by MGW3, and finds that the codec mode of the opposite end is the transparent transmission mode, then modifies its IP side endpoint to enter the transparent transmission state, and starts the TFO negotiation process, the channel between BSC2 and MGW3 Enter the TFO state;

In the ninth step, after BSC2 completes the above operations, its air interface is switched from clear voice to encrypted voice, that is, switched to the transparent transmission mode.

At this point, both the information sending end and the information receiving end can enter the encrypted conversation state, that is, the encrypted information can be transmitted in the IP and TDM hybrid network in a transparent transmission manner, so that users can be connected in the IP and TDM hybrid network Provide reliable end-to-end services.

In the IP network, it is also possible to indicate the occurrence of an event switching to the transparent transmission mode by defining a new event type. For example, as shown in Figure 8, the extension defines an Event (event) of one byte to indicate the event of switching to the transparent transmission mode, so that the peer end can be notified to switch the transparent transmission mode through the event defined by the extension operate.

The embodiment of the present invention also provides a system for implementing transparent transmission in a hybrid network. The system is set in a hybrid network including an IP network and a TDM network. Its specific implementation structure is shown in FIG. 9 , and may specifically include the following devices:

(1) at least one first network device, which is set in a TDM network or an IP network, and is used to transmit information in a transparent transmission manner;

Wherein, if the first network device is set in a TDM network, it is used to transmit information using a TDM-based transparent transmission mode (such as ISLP mode, TFO mode, etc.); if the first network device is set in an IP network, then use To use IP-based transparent transmission methods (such as RTCP method, TrFO method or RFC 2833 method, etc.) for information transmission;

(2) at least one second network device, which is connected between the IP network and the TDM network, and is used for information that needs to be transparently transmitted from the first network device or other second network devices, and for all received information The above information is converted between the IP-based transparent transmission mode and the TDM-based transparent transmission mode, and the converted information is transmitted.

The second network device may specifically include the following processing units:

(1) Information receiving unit, used for receiving the information that needs transparent transmission, for example, can receive the information that IP-based transparent transmission mode sends, or, also can receive the information that TDM-based transparent transmission mode sends;

(2) a transparent transmission mode conversion processing unit, which is used to convert the information received by the information receiving unit between an IP-based transparent transmission mode and a TDM-based transparent transmission mode, and the received IP-based transparent The information sent by the transmission method is converted into a TDM-based transparent transmission method for transmission, or the received information sent by the TDM-based transparent transmission method is converted into an IP-based transparent transmission method for transmission;

(3) An information sending unit, configured to transmit the information converted and processed by the transparent transmission mode conversion processing unit, so as to realize transparent transmission of information in the hybrid network.

Optionally, the second network device may further include any of the following units:

(1) a first transparent transmission determining unit, configured to receive and acquire a transparent transmission indication, and determine that the network device needs to use transparent transmission to transmit information according to the transparent transmission indication;

Wherein, the first transparent transmission determining unit communicates with other devices on the bearer channel used for information transmission, and is used to obtain the message containing the transparent transmission indication; or, the first transparent transmission determining unit communicates with the control device , which is used to get the message containing the transparent transmission indication.

It should be noted that the control device may specifically include:

The transmission mode determination unit is configured to receive an indication from the device passing through the bearer channel that it needs to switch to the transparent transmission mode; or, in the process of establishing the voice channel, if it is determined that the transparent transmission mode is allowed, then it is determined that the transparent transmission mode needs to be used ;

The transparent transmission indication message sending unit is configured to set the codec type of the transparent transmission mode as the transparent transmission indication in the message of adding an endpoint or modifying an endpoint, and send the message containing the transparent transmission indication.

(2) a second transparent transmission determining unit, configured to determine that transparent transmission is required for information transmission after detecting and identifying the information sent through transparent transmission;

Wherein, the second transparent transmission determining unit may include:

The first detection and identification unit is configured to receive information sent by other devices on the bearer channel, and if the codec type of the sent information is a transparent transmission method, then determine that the information sent by the transparent transmission method is detected and identified; or,

The second detection and identification unit is used to receive information sent by other devices on the bearer channel or, according to the format or content of the received information, determine that the information is sent by transparent transmission, then determine that the information is sent by transparent transmission coming information.

In the embodiment of the present invention, if the ISLP mode is adopted as the TDM-based transparent transmission mode, the system for realizing transparent transmission in the corresponding hybrid network may specifically include:

At least one first network device is set in the TDM network or IP network, and is used to transmit information by using the intersystem link protocol ISLP or IP-based transparent transmission;

At least one second network device, connected between the IP network and the TDM network, used for information that needs to be transparently transmitted from the first network device or other second network devices, and based on the received information The conversion process between the IP transparent transmission method and the ISLP-based transparent transmission method transmits the converted information.

In the embodiment of the present invention, a solution for realizing transparent transmission in the IP network is also provided. In this implementation solution, firstly, a bearer channel is established between the information sending end and the information receiving end in the IP network; After receiving the information that needs to be transmitted in a transparent transmission mode, the network device (ie, media gateway and/or wireless access device) through which the channel passes, transmits the received information in an IP-based transparent transmission mode.

Wherein, each network device performs corresponding transparent transmission processing according to the received transparent transmission instruction information, that is, before the network device receives information that needs to be transmitted in a transparent transmission mode, the network device also needs to obtain the corresponding transparent transmission information. A transmission indication, so as to determine according to the transparent transmission indication that the network device needs to use transparent transmission to transmit information.

The process for the network device to obtain the transparent transmission indication may be as follows: the network device receives a message sent by other network equipment (such as an IP-based BSC or MGW, etc.) on the bearer channel, and the message contains a transparent transmission indication; or, the network The device receives a message sent by the control device (such as MSC, etc.), and the message contains a transparent transmission indication; or, the codec type received by the media gateway and/or wireless access device through the bearer channel is transparent transmission After the information of the method is determined, it is determined that the information needs to be transmitted in a transparent transmission method.

In an IP network, when other network devices send a message containing a transparent transmission indication, the transparent transmission indication may be transmitted specifically through an extended RTCP message, an extended RFC 2833 message, or an extended TrFO message, so as to facilitate The receiver network device of the message can learn the transparent transmission indication, and execute a corresponding transparent transmission mode.

In an IP network, the process for the control device to send a message containing a transparent transmission indication may be: the control device sets the codec type of the transparent transmission mode as the transparent transmission indication in the message of adding an endpoint or modifying the endpoint, and sends the transparent transmission indication. The above message is used to realize the function of notifying the corresponding network device to perform transparent transmission processing.

In order to facilitate a further understanding of the implementation scheme for realizing transparent transmission in the IP network, specific embodiments of the scheme will be described below with reference to the accompanying drawings.

Specific embodiment one in IP network

In a pure IP network, as shown in Figure 10, the corresponding transparent transmission process includes the following steps:

Step 1, the IP-based BSC initiates a call establishment request to MSCe1, and the codec type carried in the request includes UDTD;

Step 2: After receiving the message containing the codec type UDTD, MSCe1 sends a transparent transmission instruction to MGW1 connected to it, so as to notify MGW1 to perform transparent transmission processing;

Specifically, UDTD can be set in the corresponding message of adding an endpoint to instruct MGW1 to perform transparent transmission processing;

The MSCe1 also confirms to the IP-based BSC that it has switched to the transparent transmission mode by carrying UDTD in the assignment message sent to the IP-based BSC;

In this step, after MSCe1 completes the assignment operation for the IP-based BSC, it can set UDTD in the corresponding add message to instruct MGW1 to perform transparent transmission processing;

Step 3, MSCe1 also notifies MSCe2 communicating with it that information needs to be transmitted in a transparent transmission mode;

Specifically, it may be an extension of the SIP message transmitted between MSCe1 and MSCe2 to carry UDTD as transparent transmission indication information;

Step 4, after receiving the notification, MSCe2 instructs MGW2 to perform transparent transmission processing by setting UDTD in the message of adding an endpoint;

In this step, MSCe2 can also notify the BSC at the information receiving end of using transparent transmission to transmit information through an assignment message;

The above steps 3 and 4 can also be replaced by: the IP-based BSC of the opposite end office (that is, the information receiving end) indicates that it uses transparent transmission to transmit information by sending messages such as paging responses to MSCe2, and when MSCe2 receives After receiving the paging response and other messages, notify MGW2 to perform transparent transmission processing by setting UDTD in the message such as adding an endpoint;

Step 5, adopt EVRC coding and decoding mode to carry out the transmission of voice (clear words) between the BSC based on IP of the information sending end and the BSC based on IP of the information receiving end;

Step 6, the BSC at the information sending end determines that it needs to switch to the state of encrypted transmission, that is, the switching of the transparent transmission mode is performed;

Step 7: UDTD codec is used to transmit voice (encrypted voice) between the IP-based BSC at the information sending end and the IP-based BSC at the information receiving end.

Through the above processing process, transparent transmission of end-to-end services in the IP network can be realized, thereby satisfying user's business transmission requirements such as encrypted voice transmission.

Specific embodiment two in IP network

In the IP network, taking the TrFO transmission mode as an example, as shown in Figure 11A and Figure 11B, the corresponding transparent transmission process includes the following steps:

Step 1, set up a voice channel between the BSC based on IP at the information sending end and the BSC based on IP at the information receiving end, and use the EVRC codec mode to carry out voice (clear speech) transmission;

Step 2, the IP-based BSC at the information sending end determines that it needs to switch to the state of encrypted transmission, that is, to perform switching of transparent transmission mode;

Step 3, the IP-based BSC sends a bearer update request to MSCe1, and a UDTD indication is set in the update request to indicate that the current codec type is updated to UDTD;

Step 4, after receiving the update request, MSCe1 notifies MGW1 to update the codec type, so as to implement transparent transmission for information transmission processing;

Specifically, the codec type in MGW1 can be updated as UDTD by setting the codec type as UDTD in the message of modifying the endpoint;

After the update of the codec type of MGW1 is completed, the update of the codec type may be confirmed to the IP-based BSC by carrying the UDTD in the update confirmation message;

In this step, the modification message can be sent before sending the update confirmation message, and can also be sent after sending the update confirmation message;

Step 5, UDTD is used for voice transmission between the IP-based BSC and MGW1;

Step 6, MSCe1 also sends an indication to MSCe2 that a transparent transmission mode is currently required;

Specifically, the UDTD can be set in the invitation message to indicate that MSCe2 needs to use transparent transmission to transmit information;

Step 7: After MSCe2 receives the instruction, it notifies MGW2 to execute the transparent transmission mode by carrying UDTD instruction through extension of message such as modification;

The UDTD indication can be sent before MSCe2 returns the confirmation message to MSCe1, or can be sent after returning the confirmation message;

Step 8, UDTD is used for voice transmission between MGW1 and MGW2;

Step 9, MSCe2 also notifies the IP-based BSC of the opposite end office to implement the transparent transmission mode;

Step 10, UDTD is used for voice transmission between MGW2 and the IP-based BSC of the opposite end office.

It should be noted that, in the above process, step 5 may be performed at any time after step 4, and step 8 may be performed at any time after step 7 is performed.

Specific embodiment three in IP network

In the IP network, take the RTCP or RFC 2833 transmission mode as an example, as shown in Figure 12, the corresponding transparent transmission process includes the following steps:

Step 1, the IP-based BSC at the information sending end determines that it needs to switch to the state of encrypted transmission, that is, to perform switching of transparent transmission mode;

Step 2, the IP-based BSC instructs MGW1 to perform information transmission in a transparent transmission mode through an extended RTCP or RFC 2833 message;

Step 3, UDTD is used for voice transmission between the IP-based BSC and MGW1;

Step 4, MGW1 also instructs MGW2 to perform information transmission in a transparent transmission mode through an extended RTCP or RFC 2833 message;

Step 5, UDTD is used for voice transmission between MGW1 and MGW2;

Step 6, MGW2 notifies MSCe2 of the information of switching to the transparent transmission mode, and MSCe2 notifies the IP-based BSC of the peer end office through an extended RTCP or RFC 2833 message that it needs to implement transparent transmission mode for information transmission;

Step 7: UDTD is used for voice transmission between MGW2 and the IP-based BSC of the opposite end office.

It should be noted that, in the above process, the step 3 can be executed at any time after the step 2 is executed, and the step 5 can be executed at any time after the step 4 is executed.

The embodiment of the present invention also provides a network device, which is a media gateway or a wireless access device. Its specific structure is shown in FIG. 13 , including the following processing units:

(1) an information receiving unit, configured to receive information that needs to be transmitted in a transparent transmission manner;

(2) a transparent transmission processing unit, configured to process the information received by the information receiving unit in an IP-based transparent transmission manner;

(3) An information sending unit, configured to send the information processed by the transparent transmission processing unit.

Optionally, the network device may also include a transparent transmission instruction acquisition unit, configured to obtain a transparent transmission instruction sent by other network devices or control devices, and determine that the network device needs to use transparent transmission to perform information transfer according to the transparent transmission instruction. transmission, and notify the transparent transmission processing unit.

Optionally, the network device may also include a first transparent transmission mode notification unit, which is used to pass the extended real-time transmission control protocol RTCP message, or the extended request annotation RFC 2833 message, or the TrFO message without an encoder, to bear the weight of the transmission. The transparent transmission indication described above.

The embodiment of the present invention also provides a control device, the specific structure of which is shown in Figure 13, including the following processing units:

(1) a transparent transmission mode determining unit, configured to determine that a transparent transmission mode needs to be executed according to a message received from a network device;

(2) The second transparent transmission mode notification unit is used to send a notification to the network equipment passing through the information transmission process after the transparent transmission mode determines that the transparent transmission mode needs to be implemented, so as to indicate that the network equipment needs to adopt transparent transmission when receiving After the information is transmitted by means of IP, the received information will be transmitted by means of IP-based transparent transmission;

Wherein, the second transparent transmission mode notification unit may specifically include:

In the message modification unit, it is used to set the codec type of the transparent transmission mode in the message of adding an endpoint or modifying the endpoint as the transparent transmission indication;

A message sending unit, configured to send the message modified by the message modifying unit.

In summary, the implementation of the embodiment of the present invention can realize transparent transmission of end-to-end services in an IP-based network (including a pure IP network and a mixed network of IP and TDM), that is, it can switch to a transparent transmission mode for business The transmission of information can ensure that the encrypted business information can be transparently transmitted to the receiving end through the IP network, which improves the reliability and security of the network.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (22)

1. A method for implementing transparent transmission in a hybrid network, comprising:

in a hybrid network comprising an IP network and a time division multiplexing TDM network, network equipment connected between the IP network and the TDM network receives information to be transparently transmitted;

carrying out conversion processing between an IP-based transparent transmission mode and a TDM-based transparent transmission mode on the received information, and transmitting the converted information;

the method also comprises a step that the network equipment determines that the received information needs to be transmitted by adopting a transparent transmission mode, and the step comprises the following steps:

the network equipment receives a transparent transmission instruction, and determines that the network equipment needs to adopt a transparent transmission mode to transmit information according to the transparent transmission instruction;

or,

after the network equipment detects and identifies the information sent by the transparent transmission mode, the network equipment determines that the network equipment needs to adopt the transparent transmission mode to transmit the information;

or,

the network device detects and identifies the information sent by the transparent transmission mode, and then requests the control device to determine whether the transparent transmission mode is allowed to be adopted, if the control device allows the transparent transmission mode to be adopted, the network device is determined to need to adopt the transparent transmission mode to carry out information transmission.

2. The method of claim 1, wherein the step of the network device receiving the transparent transmission indicator comprises:

the network equipment connected between the IP network and the TDM network receives information sent by other equipment on a bearing channel, wherein the information comprises a transparent transmission instruction; or,

and the network equipment connected between the IP network and the TDM network receives the information sent by the control equipment, wherein the information comprises a transparent transmission instruction.

3. The method of claim 2, wherein the step of the control device sending information including a transparent transmission indicator comprises:

the control equipment receives an indication that the transparent transmission mode needs to be switched, and then sends the information to the corresponding network equipment; or,

and the control equipment determines that a transparent transmission mode is allowed to be adopted in the process of establishing the bearer channel, and then sends the information to the corresponding network equipment.

4. The method of claim 2,

the step of the control device sending the information containing the transparent transmission indication comprises the following steps:

setting a coding and decoding type of a transparent transmission mode in a message of an added endpoint or a message of a modified endpoint or a message of a TrFO without a coder as the transparent transmission indication, and sending the information;

the step of sending information containing transparent transmission indication by other devices on the bearer channel includes:

and carrying and transmitting the transparent transmission indication in an extended real-time transport control protocol (RTCP) message or an extended request for comments (RFC 2833) standard message or an extended message of tandem-free operation (TFO).

5. The method of claim 1, wherein the step of the network device detecting and identifying the information transmitted via the transparent transmission comprises:

the network equipment receives the information of which the coding and decoding type is the transparent transmission mode, or determines that the information is transmitted by adopting the transparent transmission mode according to the format or the content of the received information, and then determines to detect and identify the information transmitted by the transparent transmission mode.

6. The method according to any of claims 1 to 5, wherein the TDM based transparent transport mode comprises: a transmission mode based on an intersystem link protocol ISLP, or a transmission mode without tandem operation TFO.

7. A network device, wherein the network device is connected between an IP network and a TDM network, and specifically comprises:

the information receiving unit is used for receiving the information needing transparent transmission;

a transparent transmission mode conversion processing unit, configured to perform conversion processing between an IP-based transparent transmission mode and a TDM-based transparent transmission mode on the information received by the information receiving unit;

an information sending unit, which is used for transmitting the information converted and processed by the transparent transmission mode conversion processing unit;

the network device further includes:

the first transparent transmission determining unit is used for receiving a transparent transmission instruction and determining that the network equipment needs to adopt a transparent transmission mode to transmit information according to the transparent transmission instruction; or,

and the second transparent transmission determining unit is used for determining that the information needs to be transmitted by adopting the transparent transmission mode after the information transmitted by the transparent transmission mode is detected and identified.

8. A system for implementing transparent transmission in a hybrid network, the system being disposed in the hybrid network including an IP network and a TDM network, and specifically comprising:

at least one first network device, which is arranged in the TDM network or the IP network and is used for transmitting information by adopting a transparent transmission mode;

at least one second network device connected between the IP network and the TDM network, for the information which is sent by the first network device or other second network devices and needs transparent transmission, and performing conversion processing between the IP-based transparent transmission mode and the TDM-based transparent transmission mode on the received information, and transmitting the converted information;

the second network device further comprises:

the first transparent transmission determining unit is used for receiving a transparent transmission instruction and determining that the network equipment needs to adopt a transparent transmission mode to transmit information according to the transparent transmission instruction; or,

and the second transparent transmission determining unit is used for determining that the information needs to be transmitted by adopting the transparent transmission mode after the information transmitted by the transparent transmission mode is detected and identified.

9. The system according to claim 8, wherein said first transparent transmission determining unit is in communication with other devices on a bearer channel for information transmission, for receiving information including transparent transmission indication; or, the first transparent transmission determining unit is in communication with the control device and is configured to receive information including a transparent transmission indication.

10. The system of claim 9, wherein said control device comprises:

a transmission mode determining unit, configured to receive an instruction to switch to a transparent transmission mode; or, determining whether to allow a transparent transmission mode to be adopted in the process of establishing the bearing channel;

a transparent transmission indication message sending unit, configured to set a codec type of a transparent transmission mode as the transparent transmission indication in the message of the added endpoint or the message of the modified endpoint after the transmission mode determining unit receives the indication or determines that the transparent mode is allowed to be used, and send the message including the transparent transmission indication.

11. The system of claim 8, wherein the second transparent transmission determining unit comprises:

the first detection and identification unit is used for determining, detecting and identifying the information sent by the transparent transmission mode after receiving the information of which the coding and decoding type is the transparent transmission mode; or,

and the second detection and identification unit is used for determining, detecting and identifying the information transmitted by the transparent transmission mode after determining that the information is transmitted by adopting the transparent transmission mode according to the format or the content of the received information.

12. A method for realizing transparent transmission detection in a hybrid network is characterized in that the hybrid network comprises an IP network and a TDM network, an ISLP-based transmission mode is adopted in the TDM network as a transparent transmission mode to transmit information, and the process of transparent transmission detection specifically comprises the following steps:

network equipment connected between an IP network and a TDM network receives information sent by the TDM network;

a received set of consecutive information frames is examined to confirm detection of an ISLP frame if it is determined that the set of consecutive information frames contains a predetermined number of 0x7E filler symbols.

13. A method for implementing transparent transport in an IP network, comprising:

in an IP bearing network, establishing an end-to-end bearing channel;

after receiving the information needing to be transmitted by adopting a transparent transmission mode at a media gateway and/or wireless access equipment through which the bearing channel passes, transmitting the received information in an IP bearing network by adopting an IP-based transparent transmission mode;

wherein, still include:

the media gateway and/or the wireless access equipment receives a transparent transmission instruction, and determines that information needs to be transmitted in a transparent transmission mode according to the transparent transmission instruction;

or,

and after the coding and decoding type of the information which is transmitted through the bearing channel and is received by the media gateway and/or the wireless access equipment is the information of the transparent transmission mode, determining that the information needs to be transmitted by adopting the transparent transmission mode.

14. The method according to claim 13, wherein the step of the media gateway and/or the wireless access device receiving the indication using transparent transmission comprises:

receiving information sent by other media gateways and/or wireless access equipment on the bearer channel, wherein the information comprises a transparent transmission instruction; or,

and receiving information sent by the control equipment, wherein the information comprises a transparent transmission instruction.

15. The method according to claim 14, wherein the step of the other media gateway and/or the wireless access device sending the message containing the transparent transmission indication comprises:

the transparent transport indication is transported via an extended real-time transport control protocol RTCP message, or an extended request for comments RFC 2833 message, or an extended coderless running TrFO message.

16. The method of claim 14, wherein the step of the control device sending a message containing a transparent transmission indicator comprises:

and setting the coding and decoding type of the transparent transmission mode in the message of the added endpoint or the message of the modified endpoint as the transparent transmission indication, and sending the message.

17. The method of claim 14, 15 or 16, further comprising: information containing transparent transmission indications is transmitted between the control devices.

18. A network device, which is a media gateway or a wireless access device, the network device comprising:

the information receiving unit is used for receiving the information needing to be transmitted by adopting a transparent transmission mode;

the transparent transmission processing unit is used for processing the information received by the information receiving unit by adopting an IP-based transparent transmission mode;

the information sending unit is used for sending the information processed by the transparent transmission processing unit;

the network device further includes:

and the transparent transmission instruction acquisition unit is used for receiving transparent transmission instructions sent by other network equipment or control equipment, determining that the network equipment needs to adopt a transparent transmission mode to transmit information according to the transparent transmission instructions, and informing the transparent transmission processing unit.

19. The network device according to claim 18, further comprising a first transparent transport mode notification unit, configured to carry the transparent transport indication via an extended real-time transport control protocol RTCP message, or an extended request for comments RFC 2833 message, or an encoder-less running TrFO message.

20. The network device according to claim 18 or 19, wherein the wireless access device comprises: a base station controller or a radio network controller.

21. A control apparatus, characterized by comprising:

a transparent transmission mode determining unit, configured to determine, according to a received message sent by the network device, that a transparent transmission mode needs to be executed;

and the second transparent transmission mode notification unit is used for sending a notification to the network equipment in the information transmission process after the transparent transmission mode determines that the transparent transmission mode needs to be executed, so as to indicate the network equipment to transmit the received information in the IP-based transparent transmission mode after receiving the information which needs to be transmitted in the transparent transmission mode.

22. The control device according to claim 21, wherein the second transparent transmission mode notification unit includes:

a message modification unit, configured to set a codec type of a transparent transmission mode as the transparent transmission indication in a message of an added endpoint or a message of a modified endpoint;

and the message sending unit is used for sending the message modified by the message modifying unit.

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