CN100584058C - An information interaction system and its implementation method - Google Patents

Abstract

The invention discloses an information interaction system, which comprises a base station controller (BSC), a code conversion and rate adaptation unit (TRAU), a BSC side load sharing processing module, a BSC side link control module, a TRAU side load sharing processing module and The TRAU side link control module, the BSC side load sharing processing module is used to realize the load sharing processing of the BSC side link; the TRAU side load sharing processing module is used to realize the load sharing processing of the TRAU side link; the BSC side link control module is used for It is used to control the BSC side link to realize the reliability of the BSC side link; the TRAU side link control module is used to control the TRAU side link to realize the reliability of the TRAU side link. The invention also discloses an information exchange method between the BSC side and the TRAU side. The invention can reliably transmit information between the BSC side and the TRAU side, and realize load sharing processing.

Description

An information interaction system and its implementation method

technical field

The present invention relates to the technical field of wireless communication, and more specifically, relates to an information exchange system and an implementation method between a base station controller (BSC) side and a speech coding transformation and rate adaptation unit (TRAU).

Background technique

The speech coding conversion and rate adaptation unit (TRAU) is logically a part of the BSC, but in fact it can be placed separately from the BSC, for example, it can be placed in the MSC equipment room. In this case, the TRAU is called the TRAU remote unit of the BSC. Remotely placing TRAU on the core network for processing can effectively save the transmission bandwidth between the BSC and the core network equipment room. Taking the PCM voice of 64kbit/s as an example, after codec compression processing, it can become compressed voice of 16kbit/s, and the compression ratio is 4:1. In this way, the transmission of the compressed voice signal saves about 75% of the bandwidth compared with the transmission of the PCM signal, which can greatly reduce the transmission and operation cost of the operator.

However, moving TRAU farther away also poses some technical problems. How to ensure reliable signaling transmission between the local side of the BSC and the remote unit of the TRAU is one of them. Although the concept of remote TRAU has been proposed in the existing GSM protocol, there is no provision for communication between the local side of the BSC and the remote TRAU unit. If an ordinary link layer protocol (such as LAPD) is used on the E1 line to transmit the signaling, voice or data of the BSC local box and the TRAU remote unit, obviously the reliability cannot be guaranteed to meet the requirements, and the load sharing process cannot be realized at the same time. .

As analyzed above, if an ordinary link layer protocol is used on the E1 line to transmit the information of the local side of the BSC and the remote side of the TRAU, the reliability cannot be guaranteed to meet the requirements, and the load sharing process cannot be realized at the same time. In this way, eventually the call fails due to the communication failure between the BSC and the TRAU, and the call loss rate increases. Especially when the traffic volume is heavy, it will easily cause long-term and large-area call loss, which is intolerable for commercial BSCs. Similarly, if MultiCarrier PPP over E1 is used, a network processor (NP) is required to implement hardware forwarding of IP packets, otherwise the performance cannot meet the requirements, but the design of hardware forwarding will increase the cost of BSC software and hardware and equipment complexity.

Contents of the invention

In view of this, the main purpose of the present invention is to propose an information exchange system between BSC and TRAU, so as to reliably transmit information between BSC and TRAU, and realize load sharing processing.

Another object of the present invention is to propose a method for transmitting information from the BSC side to the TRAU side, so as to realize reliable information transmission from the BSC side to the TRAU side and realize load sharing processing.

Another object of the present invention is to propose a method for transmitting information from the TRAU side to the BSC side, so as to realize reliable information transmission from the TRAU side to the BSC side, and realize load sharing processing.

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

An information interaction system, the system includes a BSC and a TRAU, the TRAU is remote from the BSC, the BSC side includes a BSC side load sharing processing module and a BSC side link control module, and the TRAU side includes a TRAU side load sharing processing module and The TRAU side link control module, wherein the BSC side load sharing processing module and the BSC side link control module are connected to each other, the TRAU side load sharing processing module and the TRAU side link control module are connected to each other, and the BSC side link control module and the TRAU side link control module are connected to each other. The side link control module is connected, and,

The BSC side load sharing processing module is used to realize the load sharing processing of the BSC side link;

The TRAU side load sharing processing module is used to implement the load sharing processing of the TRAU side link;

The BSC side link control module is used to control the BSC side link to realize the reliability of the BSC side link;

The TRAU side link control module is used to control the TRAU side link to realize the reliability of the TRAU side link;

Wherein, the BSC side load sharing processing module includes a BSC side message transfer part MTP3 module and a BSC side signaling connection control part SCCP module, and the TRAU side load sharing processing module includes a TRAU side MTP3 module and a TRAU side SCCP module, wherein the BSC side The MTP3 module is connected to the SCCP module on the BSC side, and the MTP3 module on the TRAU side is connected to the SCCP module on the TRAU side.

The BSC-side link control module is a BSC-side MTP2 module, and the TRAU-side link control module is a TRAU-side MTP2 module.

The BSC side link control module is a BSC side multi-channel binding point-to-point protocol (MC PPP) module, and the TRAU side link control module is a TRAU side MC PPP module.

The connection between the BSC-side link control module and the TRAU-side link control module is: a connection formed by at least one E1 line.

A method for transmitting information from the BSC side to the TRAU side, where the TRAU is remote from the BSC, and the method includes:

A1. The load of the link on the BSC side is shared by link dynamic round selection to select the link for transmitting information;

B1. Control the link to realize the reliability of the link on the BSC side, and transmit information to the TRAU side through the link.

The method includes receiving a call processing message from the TRAU side before step A1;

Step A1 includes:

A11. Analyze the call processing message to determine whether to send a resource allocation request message to TRAU;

A21. Add a source address and a destination address to the resource allocation message, and use link IDs to distinguish different logical links, and perform load sharing through dynamic link selection to select a link for transmitting information.

The transmitted information is signaling information or voice information.

A method for transmitting information from a TRAU side to a BSC side, where the TRAU is remote from the BSC, and the method includes:

A2. The load of the link on the TRAU side is shared by means of dynamic link selection to select a link for transmitting information;

B2. Control the link to realize the reliability of the link on the TRAU side, and transmit information to the BSC side through the link.

The method includes receiving a call processing message from the BSC side before step A2;

Step A2 includes:

A21. Analyze the call processing message to determine whether to respond to the BSC with a resource allocation response message;

A22. Add a source address and a destination address to the resource allocation message, and use link IDs to distinguish different logical links, and perform load sharing through dynamic link selection to select a link for transmitting information.

The load sharing of the links on the TRAU side described in step A2 is: sharing the load of the links on the TRAU side in a dynamic link selection manner.

The transmitted information is signaling information or voice information.

It can be seen from the above technical solutions that the information interaction system proposed by the present invention includes BSC and TRAU, the BSC side includes a BSC side load sharing processing module and the BSC side link control module, and the TRAU side includes a TRAU side load sharing processing module and TRAU The side link control module, wherein the BSC side load sharing processing module and the BSC side link control module are connected to each other, the TRAU side load sharing processing module is connected to the TRAU side link control module, and the BSC side link control module and the TRAU side link control module are connected to each other. The control module is connected, and the BSC side load sharing processing module is used to realize the load sharing processing of the BSC side link; the TRAU side load sharing processing module is used to realize the load sharing processing of the TRAU side link; the BSC side link control module is used to control the BSC side link to realize the reliability of the BSC side link; the TRAU side link control module is used to control the TRAU side link to realize the reliability of the TRAU side link.

It can be seen that since both the SCCP function and the MTP function are part of the No. 7 signaling, after applying the present invention, the BSC can use the existing No. 7 signaling processing function on the A interface to complete the TRAU remote communication function, that is, the BSC The external interface (A interface) and the BSC internal interface (Ater interface) can share the No. 7 signaling processing, and the local and remote signaling are carried by the internal No. 7 signaling, so as to realize the reliable transmission of information between the BSC side and the TRAU. And thoroughly realize load sharing processing.

Description of drawings

Fig. 1 is a schematic diagram of an exemplary structure of an information exchange system between a BSC side and a TRAU side according to the present invention.

Fig. 2 is a schematic structural diagram of an information exchange system between a BSC side and a TRAU side according to an embodiment of the present invention.

Fig. 3 is an exemplary flowchart of a method for transmitting information from the BSC side to the TRAU side according to the present invention.

Fig. 4 is an exemplary flowchart of a method for transmitting information from the TRAU side to the BSC side according to the present invention.

Fig. 5 is a schematic diagram of an MTP routing label according to an embodiment of the present invention.

Fig. 6 is a flowchart of an exemplary method for transmitting information from the BSC side to the TRAU side 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.

First, reliability and load sharing will be described. Reliability refers to the method of reliable link transmission on unreliable links. It is generally implemented through link layer protocols. The main means of implementation are signal reception confirmation and retransmission mechanisms. Load sharing refers to an algorithm that distributes load more evenly among multiple links. Once one of the links is congested or fails, the load on it can be evenly distributed to the remaining normal links.

Fig. 1 is a schematic diagram of an exemplary structure of an information exchange system between a BSC side and a TRAU side according to the present invention. As shown in Figure 1, the system includes a BSC 101 and a TRAU 104, wherein the TRAU 104 is placed remotely, the BSC side includes a BSC side load sharing processing module 102 and the BSC side link control module 103, and the TRAU side includes a TRAU side load sharing processing module 15 and the TRAU side link control module 106, wherein the BSC side load sharing processing module 102 and the BSC side link control module 103 are connected to each other, the TRAU side load sharing processing module 105 and the TRAU side link control module 106 are connected to each other, and the BSC The side link control module 103 is connected to the TRAU side link control module 106, and

The BSC side load sharing processing module 102 is used to realize the load sharing processing of the BSC side link;

A load sharing processing module 105 on the TRAU side, configured to implement load sharing processing of links on the TRAU side;

The BSC side link control module 103 is configured to control the BSC side link so as to realize the reliability of the BSC side link;

The TRAU-side link control module 106 is configured to control the TRAU-side link so as to realize the reliability of the TRAU-side link.

Preferably, the BSC side load sharing processing module 102 includes a BSC side message transfer part MTP3 module and a BSC side signaling connection control part SCCP module, and the TRAU side load sharing processing module 105 includes a TRAU side MTP3 module and a TRAU side SCCP module, wherein the BSC side The MTP3 module is connected to the SCCP module on the BSC side, and the MTP3 module on the TRAU side is connected to the SCCP module on the TRAU side. More preferably, the BSC-side link control module 103 is a BSC-side MTP2 module, and the TRAU-side link control module 106 is a TRAU-side MTP2 module. Optionally, the BSC-side link control module 103 may be a BSC-side MC PPP module, and the TRAU-side link control module 106 may be a TRAU-side MC PPP module.

Wherein, the connection between the BSC side link control module 103 and the TRAU side link control module 106 can be a connection formed by at least one E1 line, and wherein each E1 line has 32 64kbit/s time slots, Each time slot is decomposed into 4 sub-time slots of 16kbit/s for voice transmission, but not decomposed when transmitting signaling.

Based on FIG. 1 , FIG. 2 is a schematic structural diagram of an information exchange system between a BSC side and a TRAU side according to an embodiment of the present invention. As shown in Figure 2, the system includes a BSC 201 and a TRAU202 placed remotely, wherein the SCCP module 203 and the MTP3 module 204 on the BSC side correspond to the load sharing processing module 102 on the BSC side in Figure 1, and the MTP2 module 205 on the BSC side corresponds to The link control module 103 on the BSC side in FIG. 1 . The SCCP module 206 and the MTP3 module 207 on the TRAU side correspond to the load sharing processing module 105 on the TRAU side in FIG. 1 , and the MTP2 module 208 on the TRAU side corresponds to the link control module 106 on the BSC side in FIG. 1 . The external interface between the BSC and the core network device 209 is the A interface, and the internal interface between the BSC 201 and the TRAU 202 is the Ater interface, both of which can share the No. 7 signaling.

Preferably, in specific implementation, the local side of the BSC can be physically implemented as a signaling processing board and a transmission processing board, and the TRAU can also be physically implemented as physical units such as a signaling processing board and a transmission processing board. For example, an SCCP module and an MTP3 module are integrated on the signaling processing board, and an MTP2 module is integrated on the transmission processing board. At this time, the voice processing may pass from the core network device 209 to the TRAU transmission processing board, and then to the BSC transmission processing board. Among them, the MSC 209 to TRAU transmission processing board is processed in the core network computer room, and the ordinary 64kbit/s PCM voice channel can be used. The TRAU transmission processing board to the BSC transmission processing board is realized through long-distance transmission. At this time, the voice signal has been compressed to 16kbit/s, and the required transmission bandwidth is only 1/4 of the original. The signaling of the A interface is processed from the MSC209 to the TRAU signaling processing board, then to the TRAU transmission processing board, and then terminated at the BSC signaling processing board through the BSC transmission processing board.

Ater interface signaling is processed from the signaling processing board of the TRAU to the transmission processing board of the TRAU, then passes through the local transmission board of the BSC, and ends at the signaling processing board of the BSC. That is to say, the signaling of the Ater interface is performed between the local BSC and the remote unit of the TRAU.

The SCCP module and MTP3 module are embedded in the TRAU signaling processing board to handle high-level signaling, and the MTP2 module is embedded in the transmission board to handle logical links. One of the signaling boards can process the signaling links of multiple transmission boards by configuring binding, that is, specifying a signaling processing board for each logical link. Since the interface (A interface) between BSC and MSC itself requires No. 7 signaling processing, the existing software (such as SCCP and MTP processing software) on the signaling board can be shared locally in the BSC to perform BSC local frame and pull Communication between far frames.

Fig. 3 is an exemplary flowchart of a method for transmitting information from the BSC side to the TRAU side according to the present invention.

As shown in Figure 3, including:

Step 301: share the load of the links on the TRAU side to select a link for transmitting information.

Step 302: Control the link to realize the reliability of the link on the TRAU side, and transmit information to the BSC side through the link.

Wherein, the call processing message from the TRAU side may be received in advance, and step 301 may include: first, analyzing the call processing message to determine a resource allocation message for sharing the link load on the BSC side; and then allocating the resource The source address and destination address are added to the message, and the link ID is used to distinguish different logical links to select the link for transmitting information. Here, the load of the link on the BSC side can be shared by means of dynamic link selection, and the transmitted information can be either signaling information or voice information.

Fig. 4 is an exemplary flowchart of a method for transmitting information from the TRAU side to the BSC side according to the present invention. As shown in Figure 4, including:

Step 401: share the load of the links on the TRAU side to select a link for transmitting information;

Step 402: Control the link to realize the reliability of the link on the TRAU side, and transmit information to the BSC side through the link.

Wherein, the call processing message from the BSC side may be received in advance, and step 401 may include: first, analyzing the call processing message to determine a resource allocation message for sharing the link load on the TRAU side; and then allocating the resource The source address and destination address are added to the message, and the link ID is used to distinguish different logical links to select the link for transmitting information. Here, the load of the link on the TRAU side can be shared by means of link dynamic round-robin, and the transmitted information can be both signaling information and voice information.

In order to realize reliable communication between the BSC local APP and the TRAU APP, the SCCP module needs to undertake the signaling control function no matter on the BSC side or the TRAU side, and the MTP module (including MTP functional level 3 and MTP functional level 2) Realize the function of the message passing part, and its core part fully complies with the ITU-T Q.7XX series protocol. The MTP3 module mainly completes the link load sharing function, and the MTP2 module mainly realizes the reliability of the link. The SCCP module is mainly responsible for providing connection and connectionless services to the upper layers.

The signaling link functions implemented by the MTP2 module include: frame delimitation, filling and error detection, error correction with retransmission, link fault monitoring, etc. Due to the realization of the above functions, the reliability of the signaling link is greatly improved. The MTP3 module implements the functions of "signaling message processing" and "signaling network management", which are collectively referred to as "signaling network functions", mainly through routing of signaling messages (that is, dynamically assigning signaling link selection code SLS) to realize " "Signaling link load sharing", when the network conditions change, the MTP3 module can control the recombination of the SLS and the pre-configured mask, so as to maintain or restore the normal message delivery capability.

In ITU-T Q.704, two load classification methods are specified, and mode A is preferably used, that is, load sharing is carried out in a signaling link set. The link set is composed of a group of links whose source and destination signaling points are the same. In order to realize load sharing, MTP3 adopts two kinds of codes, namely "signaling link selection code" SLS and "signaling link code" SLC. The latter consists of 4 bits and is used to distinguish different links in a link set. 4 bits limit the maximum number of links to 16.

The SLS is directly placed in the routing label of the MTP3 header, and the currently used link is selected by a round-robin method to achieve the purpose of load balancing within the link set. When the MTP2 module reports a link failure, the MTP3 module can delete it from the available resources, always ensuring that the load on the available links is as even as possible.

When the MTP2 module detects that the fault is restored, it will add the restored link code to the available resource pool.

Among them, the format of the MTP routing label preferably adopted by the present invention is shown in FIG. 5 .

For the configuration of MTP physical links, several E1s can be selected, and a certain time slot (for example, time slot No. 16) is fixed on each E1 line for the MTP2 link, and multiple MTP2 links are bound to a certain time slot through data configuration. In the MTP3 module, the so-called binding is a semi-fixed corresponding relationship.

For example, if an MTP3 module is configured to bind 16 MTP2 links, then a semi-fixed relationship is established between this MTP3 module and 16 64kbit/s time slots. This relationship can only be changed when the user modifies the configuration.

The MTP3 module can realize automatic load sharing on the configured 16 signaling links. Since the local BSC and the remote side of TRAU have a one-to-one physical correspondence, many simplifications can be done in the configuration of No. 7 signaling. The signaling point, signaling route, link set, etc. can be fixed in the code. , no user configuration is required. The user only configures the MTP2 physical link mentioned above and the MTP3-MTP2 binding relationship.

The MTP2 module has fault detection and link detection functions. Once the link is abnormal, it will be reported to the MTP3 module immediately, and the MTP3 module will realize the load sharing function.

Therefore, the simplified data configuration sequence of SS7 can be summarized as: first configure the MTP2 physical link and logical link, and then configure the MTP3-MTP2 binding relationship.

Fig. 6 is a flowchart of an exemplary method for transmitting information from the BSC side to the TRAU side according to an embodiment of the present invention. As shown in Figure 6, the method includes:

Step 601: The call processing message from the MSC arrives at the BSC through the A interface;

Step 602: After the BSC analyzes the call processing message, if it decides to allocate TRAU resources, it sends a "resource allocation request" message to the BSC side load sharing processing module (SCCP+MTP3);

Step 603: The BSC side load sharing processing module adds the source address and destination address to the "resource allocation request" message, selects the appropriate data link (distinguishes different logical links by link ID) through the load sharing algorithm, and sends To the corresponding BSC side data link control module;

Step 604: The data link control module on the BSC side adds the link control header to the above message and sends it to the physical layer on the BSC side; the physical layer on the BSC side sends the data to the physical layer on the TRAU side; the physical layer on the TRAU side receives the data and unpacks it , sent to the TRAU side data link control module;

Step 605: The data link control module on the TRAU side checks the control packet header, and if an error is found, it requires the BSC to retransmit until completely correct data is received; then, the data link control module on the TRAU side sends the data to the TRAU side for load sharing In the processing module, the TRAU side load sharing processing module unpacks the message and performs resource allocation processing; if the resource allocation is normal, TRAU sends a "resource allocation response" message to the TRAU side load sharing processing module;

Step 606: The TRAU side load sharing processing module adds the source address and destination address to the "resource allocation response" message, selects the appropriate data link (different logical links are distinguished by link ID) through the load sharing algorithm, and sends To the corresponding data link control module on the TRAU side; the data link control module on the TRAU side adds a link control header to the above message and sends it to the physical layer on the TRAU side; the physical layer on the TRAU side sends the data to the physical layer on the BSC side; After the physical layer receives the data and unpacks it, it sends it to the data link control module on the BSC side; the data link control module on the BSC side checks the control packet header, and if an error is found, it requires the TRAU side to retransmit until it receives completely correct data and then sends it to the The BSC side load sharing processing module; the BSC side load sharing processing module unpacks the message and performs resource allocation processing.

Step 607: After the load sharing processing module on the BSC side completes resource allocation, the BSC sends a call processing response message to the MSC, returns to the MSC through the A interface, and completes call connection processing between the MSC and the BSC.

Although the implementation of the present invention has been specifically described above by taking the downlink message as an example, it is obvious that this is only exemplary and not intended to limit the present invention. The uplink message is similar to this, and the present invention will not describe it again.

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 information interaction system, it is characterized in that, this system comprises base station controller BSC and speech coding conversion and Rate Adapter Unit TRAU, described TRAU and described BSC zoom out, the BSC side comprises BSC side load sharing processing module and BSC sidelinks control module, the TRAU side comprises TRAU side load sharing processing module and TRAU sidelinks control module, wherein BSC side load sharing processing module and BSC sidelinks control module interconnect, TRAU side load sharing processing module and TRAU sidelinks control module interconnect, described BSC sidelinks control module is connected with TRAU sidelinks control module, and

BSC side load sharing processing module is used to realize the load sharing processing of BSC sidelinks;

TRAU side load sharing processing module is used to realize the load sharing processing of TRAU sidelinks;

BSC sidelinks control module is used for the BSC sidelinks is controlled to realize the reliability of BSC sidelinks;

TRAU sidelinks control module is used for the TRAU sidelinks is controlled to realize the reliability of TRAU sidelinks;

Wherein said BSC side load sharing processing module comprises BSC side Message Transfer Part MTP3 module and BSC side SCCP SCCP module, described TRAU side load sharing processing module comprises TRAU side MTP3 module and TRAU side SCCP module, wherein BSC side MTP3 module is connected with BSC side SCCP module, and TRAU side MTP3 module is connected with TRAU side SCCP module.

2, information interaction system according to claim 1 is characterized in that, described BSC sidelinks control module is a BSC side MTP2 module, and described TRAU sidelinks control module is a TRAU side MTP2 module.

3, information interaction system according to claim 1 is characterized in that, described BSC sidelinks control module is a BSC side binding multiple channels point-to-point protocol MC PPP module, and described TRAU sidelinks control module is a TRAU side MC PPP module.

4, information interaction system according to claim 1 is characterized in that, being connected between described BSC sidelinks control module and the TRAU sidelinks control module: the connection that is made of at least one E1 circuit.

5, a kind ofly it is characterized in that from BSC side direction TRAU side method of transmitting information described TRAU and described BSC zoom out, this method comprises:

A1, adopt the dynamic polling of link to share to select the link of transmission information to the load of BSC sidelinks;

B1, described link is controlled realizing the reliability of this BSC sidelinks, and by this link with message transmission to the TRAU side.

6, method according to claim 5 is characterized in that, this method comprised that before steps A 1 reception comes from the call treatment message of TRAU side;

Steps A 1 comprises:

A11, described call treatment message is analyzed to determine whether sending resource allocation message to TRAU;

A21, described resource allocation message is added source address and destination address, and utilize link ID to distinguish different logical links, and carry out load sharing, to select the link of transmission information by the dynamic polling of link.

According to claim 5 or 6 described methods, it is characterized in that 7, institute's information transmitted is signaling information or voice messaging.

8, a kind ofly it is characterized in that from TRAU side direction BSC side method of transmitting information described TRAU and described BSC zoom out, this method comprises:

A2, adopt the dynamic polling of link to share to select the link of transmission information to the load of TRAU sidelinks;

B2, described link is controlled realizing the reliability of this TRAU sidelinks, and by this link with message transmission to the BSC side.

9, method according to claim 8 is characterized in that, this method comprised that before steps A 2 reception comes from the call treatment message of BSC side;

Steps A 2 comprises:

A21, described call treatment message is analyzed to determine whether responding the resource allocation response message to BSC;

A22, described resource allocation response message is added source address and destination address, and utilize link ID to distinguish different logical links, and carry out load sharing, to select the link of transmission information by the dynamic polling of link.

10, according to Claim 8 or 9 described methods, it is characterized in that institute's information transmitted is signaling information or voice messaging.

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