WO2005032089A1 - A distributed processing system and method using h.248 protocol on mgc/mgw - Google Patents
A distributed processing system and method using h.248 protocol on mgc/mgw Download PDFInfo
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- WO2005032089A1 WO2005032089A1 PCT/CN2004/000764 CN2004000764W WO2005032089A1 WO 2005032089 A1 WO2005032089 A1 WO 2005032089A1 CN 2004000764 W CN2004000764 W CN 2004000764W WO 2005032089 A1 WO2005032089 A1 WO 2005032089A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/102—Gateways
- H04L65/1043—Gateway controllers, e.g. media gateway control protocol [MGCP] controllers
Definitions
- the present invention relates to the field of communications, and in particular, to the large-capacity H.248 protocol distributed processing system and method. Background technique
- the H.248 protocol is adopted by organizations such as 3GPP / 3GPP2 as a separate protocol standard for NGN network bearer and control. It is mainly used for gateway control and bearer establishment control between MGC and MGW.
- H.248 messages These messages can be encoded in text or binary mode.
- H.248 message length is usually between 100 and 1000 bytes.
- the format of the unencoded H.248 message is shown in FIG. 1. From the outside to the inside, the format is Transaction, Action, and Command, where: Transaction: A transaction consists of several actions. A transaction has For completeness, actions and commands in the same transaction require sequential execution.
- Actions are composed of several commands. Actions generally have specific meanings. In special cases, an action consists of a India command. An action is actually an identification of a set of commands.
- Commands are the basic unit of interactive information between MGC and MGW. Commands include various command parameters.
- the operation object of the command is the context (Context), and the context is distinguished from the context identifier (Context ID).
- Context ID The context corresponds to the call and maintains the status of the terminations participating in the call.
- a complete call process will interact between MGC and MGW 20 to 60 times H.248 Command to complete the call control operation on the same context, where each interactive command is encapsulated into a transaction to form an H.248 message and sent to the other party.
- the currently commonly used H.248 protocol processing scheme is shown in Figure 2:
- the MGC or MGW has one or more H.248 interface boards externally, which is responsible for receiving external H.248 messages and sending H.248 messages to the outside; received
- the H.248 message is sent to the H.248 protocol processing board for decoding, and the corresponding H.248 transaction processing, context maintenance, and encoding of outgoing messages are performed on the board.
- the entire system has only one processor for protocol processing, so it is greatly restricted by the processor's capabilities. Even if the processor has a strong capability, it is difficult to cope with the large-capacity H.248 protocol.
- the processing capacity of the H.248 protocol of the above scheme is usually less than 100 calls / second.
- processors in the system Assuming there are ⁇ ( ⁇ > 1) processors in the system, from a probability perspective, among them (l-1 / n) * 100% of messages need to be forwarded, and each message is forwarded between 1 and n- Between 1. The more processors, the greater the probability of message forwarding, and the more times each message is forwarded to the final context processor. Based on a model with 10 processors processing 1000 calls per second, 90% of messages are forwarded. Frequent message forwarding will consume a lot of processor resources and internal communication bandwidth. In addition, since the length of the H.248 message is not fixed, the length of the decoded message is also uncertain, which brings great difficulties to the allocation and management of the communication data area. At present, no solution to the above problems has been proposed. Summary of the invention
- An object of the present invention is to provide a distributed processing system and method for the H.248 protocol that can smoothly expand the processing capacity of the system, so as to process the large-capacity H.248 protocol in order to solve the NGN system.
- the problem of load sharing in H.248 protocol is smoothly achieved by expanding the number of H.248 distributed processors and H.248 interface boards.
- a distributed processing system of H.248 protocol on MGC / MGW including: one or more H.248 interface boards, each of said H.248.
- the 248 interface board is configured to receive external H.248 messages, identify and distribute each H.248 message to its corresponding processor; one or more H.248 distributed processors, and each of the H.248 distributed processing
- the processor is configured to process the H.248 message distributed by the H.248 interface board, and generate a call-related H.248 message to be sent out;
- the H.248 centralized maintenance processor is configured to process each H.248.
- the error message sent by the 248 interface board and the maintenance message for the MGC / MGW are processed, and the normal communication between the MGC and the MGW is maintained.
- each of the H.248 interface boards further pre-decodes the received H.248 message; the pre-decoding is incomplete decoding.
- each of the H.248 distributed processors has a MGC / MGW system resource interval allocated to it.
- a system resource interval of each of the H.248 distributed processors includes a transaction ID interval and an event request ID interval allocated to the MGC; when the system is on the MGW
- the system resource interval of each H.248 distributed processor includes a transaction ID interval and a context ID interval allocated to the MGW.
- each of the H.248 interface boards has a comparison table between the MGC / MGW system resource interval and each H.248 distributed processor; each of the H.248 interface boards identifies the corresponding table according to the comparison table.
- the H.248 distributed processor corresponding to the received H.248 message, and distributes the H.248 message to the H.248 distributed processor for processing.
- an H.248 protocol distributed processing method using the H.248 protocol distributed processing system on the MGC / MGW including: each of the H.248 interface boards receives An external H.248 message, identifying the H.248 message and distributing it to a corresponding processor; each of the H.248 distributed processors receiving and processing the H distributed by each of the H.248 interface boards .248 messages, and generate call-related H.248 messages to send outward; the H.248 centralized maintenance processor receives and processes error messages sent by each of the H.248 interface boards and Maintenance messages for this MGC / MGW.
- each of the H.248 interface boards has a comparison table between the MGC / MGW system resource interval and each H.248 distributed processor, and the identifying and distributing step further includes: the pair of H.248 interface boards
- the received H.248 message is decoded; the H.248 interface board determines the processor corresponding to the H.248 message according to the decoding result and the comparison table; the H.248 interface board converts the H.248 message.
- a 248 message is sent to the determined processor.
- the determining step further includes: judging the decoded H.248 message, and if the H.248 message is a transaction response message sent by an external entity to the MGC / MGW, then the decoded transaction is used.
- the ID looks up the comparison table to determine the H.248 distributed processor to which the H.248 message belongs; if the H.248 message is a transaction request from an external entity to the MGC / MGW, then when the system is on the MGC When searching the comparison table according to the decoded event request ID to determine the H.248 distributed processor corresponding to the H.248 message; when the system is on the MGW, searching the comparison table according to the decoded context ID To determine the corresponding H.248 distributed processor in the range where the context ID is located, if the context ID is new or empty, specify an H.248 distributed processor, and the H.248 distributed processor is the context A value is assigned to the ID; if the H.248 message is decoded to obtain an error message and a
- the method further includes: after each H.248 distributed processor finishes processing the content belonging to the processor in the H.248 message, determining whether there is any content that needs to be processed by another processor, and if so, then Distribute the H.248 message to the relevant processor and wait for the processing result; after processing all the content in the H.248 message, the H.248 distributed processor judges whether the H.248 message is other processing If it is forwarded by the router, if it is, it will reply the processing result to the source processor; if not, it will encode the processing result into an H.248 message and send it.
- the method further comprises: the H.248 centralized maintenance processor further receives and processes a maintenance request message from each of the H.248 distributed processors, and notifies the H.248 distribution of the completion of the processing. Processor.
- the H.248 protocol distributed processing system and method of the present invention By adopting the H.248 protocol distributed processing system and method of the present invention, after calculation, Compared with the existing technology, it can solve the problem that the H.248 protocol cannot smoothly expand the capacity.
- the H.248 call processing capability it can support is at least 20 times higher than the current one. It is the key technology to solve the large-capacity GW and MGC in NGN systems. breakthrough. BRIEF DESCRIPTION OF THE DRAWINGS
- Figure 1 is a schematic diagram of the structure of an H.248 message
- FIG. 2 is a structural diagram of a simple processing mode of a conventional single-processor H.248 protocol
- FIG. 3 is a schematic structural diagram of an H.248 protocol distributed processing system on the MGC / MGW of the present invention
- FIG. 4 is a flowchart of the interaction between the main processing links of the H.248 message in the H.248 protocol distributed processing system on the MGOMGW of the present invention
- FIG. 5 is a schematic diagram of the processing flow of the H.248 message pre-decoding and distribution link in FIG. 4;
- FIG. 6 is a schematic diagram of the processing flow of the H.248 message distributed processing link in FIG. 4.
- FIG. 3 is a structural diagram of the H.248 protocol distributed processing system on the MGC / MGW of the present invention, including: N H.248 interface boards, one H.248 centralized maintenance processor, and N H.248 distributed processors .
- the combination of these three components can realize large-capacity H.248 protocol processing, and can realize smooth capacity expansion.
- the external message interface unit of this system is outside the scope of this patent.
- the H.248 interface board receives external messages and determines whether to send to the H.248 distributed processor or the H.248 centralized maintenance processor after pre-decoding.
- the H.248 interface board identifies the processing of each H.248 message entering the system.
- the device is a key link for realizing H.248 message processing and distribution according to the present invention.
- the H.248 centralized maintenance processor receives error messages that are not recognized by the H.248 interface board, or processes maintenance messages for the entire MGC or MGW.
- the H.248 centralized maintenance processor maintains the normal communication between the MGC and MGW, and maintains them. Consistency of resources and call status.
- the H.248 distributed processor processes the H.248 messages distributed by the H.248 interface board, and generates call-related The H.248 message is sent to the peer H.248 entity outside the system.
- H.248 interface board H.248 distributed processor
- H.248 centralized maintenance processor in this system are responsible for the three processing links of H.248 messages: message pre-decoding and distribution links, and distributed processing. Link and centralized maintenance processing link.
- FIG. 4 is a flowchart of the interaction between the three main processing links of the H.248 message in the system of Figure 3.
- the message pre-decoding and distribution link is responsible for the system's external message reception and the pre-decoding judgment of the received message.
- the centralized maintenance processing link receives the message and pre-decodes the H.248 maintenance message sent from the distribution link, or processes the maintenance request from the distributed processing link. After the processing is completed, the original H.248 distributed processor or the H.248 interface board is notified. Inform the peer H.248 entity.
- the distributed processing link mainly processes the messages from the message pre-decoding and distribution link, and generates messages according to the call progress and sends them to the peer H.248 entity.
- the messages between the H.248 distributed processors include multiple actions in a transaction ( Action) to process requests and process response messages.
- FIG. 5 is a processing flowchart of the pre-decoding and distribution of the H.248 message in Figure 4.
- the transaction ID (transaction ID) of the transaction request sent by the local MGC / MGW is allocated to each H.248 distributed processor.
- the transaction ID and processor can be found at the message pre-decoding and distribution point.
- the comparison table when the transaction request sent by the H.248 entity responds to the other party, the H.248 interface board first finds the corresponding processor according to the transaction response ID. For MGC, the H.248 interface board continues to decode the message to the EVENT Request ID.
- the event number identifier is used as a resource.
- the H.248 interface board resides for each H.248 distributed processor. Event number identification distribution table.
- the corresponding H.248 distributed processor can be found according to the table.
- the context ID (ContextlD) assigned by MGW is a resource, and a period is allocated for each H.248 distributed processor.
- the comparison between the context ID and the processor can be found at the message pre-decoding and distribution point. table.
- the H.248 interface board continues to decode to find the first ContextID. If the context ID is new or empty, specify an H.248 distributed processor The message is processed, and if the context identifier conforms to the context range of a H.248 distributed processor, the message is sent to the H.248 distributed processor for processing.
- Has an illegal transaction ID or event number ID or The messages identified by the text, or the messages and error messages for the ROOT and "-" flags are processed by the centralized maintenance processor in H.248.
- the H.248 centralized maintenance processor maintains state synchronization between H.248 communication entities.
- H.248 protocol distributed processing system When the H.248 protocol distributed processing system is on the MGC, it accepts MGW registration, and when the H.248 protocol distributed processing When the system is on the MGW, it initiates registration with the MGC.
- This section also completes the processing of error messages and resource availability maintenance messages, such as the H.248 SERVICE CHANGE command.
- FIG. 6 is the processing flow of the H.248 message distributed processing link in Figure 4.
- the relationship between the H.248 distributed processors is equal to each other, and there is no belonging relationship.
- the processor will process its own context, and then determine whether the message was forwarded by another H.248 distributed processor. If so, it will respond to the forwarding processor with the processing result, and if not, encode it as H.248.
- the message is sent out.
- the processor finds that there is a context that needs to be processed by other processors after processing its own context, it first distributes it to the relevant H.248 distributed processor, and waits for other relevant processors to process the other contexts and encode them into H together. .248 message sent.
- the secondary distribution of H.248 distributed processors is to deal with the situation where multiple actions occur in a transaction. If the processors corresponding to these contexts are different, the H.248 distributed processor that first receives the H.248 message needs to assume the tasks of distribution, waiting for a response, and then uniformly encoding.
- the H.248 interface board and the H.248 centralized maintenance processor have a small load, and the H.248 distributed processor processes the final decoding of all messages and a large call load. H can be superimposed as needed .248 distributed processor to increase H.248 processing power. The amount of pre-decoding is small.
- a complete NGN call is about 20 to 60 H.248 messages.
- the H.248 centralized maintenance processor can only process at most one of the messages (you can only process registration messages as required). Therefore, in theory, this model The processing capacity can reach more than 20 times of the simple processing method, which can meet all the large-capacity H.248 processing requirements in NGN.
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Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN03126453.0A CN1210926C (zh) | 2003-09-28 | 2003-09-28 | 一种大容量h.248协议分布式处理系统和方法 |
| CN03126453.0 | 2003-09-28 |
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| Publication Number | Publication Date |
|---|---|
| WO2005032089A1 true WO2005032089A1 (en) | 2005-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CN2004/000764 Ceased WO2005032089A1 (en) | 2003-09-28 | 2004-07-07 | A distributed processing system and method using h.248 protocol on mgc/mgw |
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| Country | Link |
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| CN (1) | CN1210926C (zh) |
| WO (1) | WO2005032089A1 (zh) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101068246B (zh) * | 2007-05-23 | 2011-05-11 | 中兴通讯股份有限公司 | 在h.248协议栈中防止并发操作的方法及其系统 |
| CN102104487B (zh) * | 2009-12-21 | 2014-12-17 | 上海贝尔股份有限公司 | 一种消息处理方法及其设备 |
| CN105554029A (zh) * | 2016-01-27 | 2016-05-04 | 北京邮电大学 | WebRTC与SIP终端媒体互通的方法和媒体网关 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1383662A (zh) * | 2000-06-06 | 2002-12-04 | 皇家菲利浦电子有限公司 | 交互式处理系统 |
| WO2003030570A1 (en) * | 2001-10-01 | 2003-04-10 | Telefonaktiebolaget L M Ericsson (Publ) | Telecommunications system and method for implementing h. 248 media gateways within third-generation mobile access networks |
| CN1419382A (zh) * | 2001-11-14 | 2003-05-21 | 深圳市中兴通讯股份有限公司上海第二研究所 | 短消息起呼控制网关 |
-
2003
- 2003-09-28 CN CN03126453.0A patent/CN1210926C/zh not_active Expired - Fee Related
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2004
- 2004-07-07 WO PCT/CN2004/000764 patent/WO2005032089A1/zh not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1383662A (zh) * | 2000-06-06 | 2002-12-04 | 皇家菲利浦电子有限公司 | 交互式处理系统 |
| WO2003030570A1 (en) * | 2001-10-01 | 2003-04-10 | Telefonaktiebolaget L M Ericsson (Publ) | Telecommunications system and method for implementing h. 248 media gateways within third-generation mobile access networks |
| CN1419382A (zh) * | 2001-11-14 | 2003-05-21 | 深圳市中兴通讯股份有限公司上海第二研究所 | 短消息起呼控制网关 |
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| Publication number | Publication date |
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| CN1210926C (zh) | 2005-07-13 |
| CN1492697A (zh) | 2004-04-28 |
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