CN1279759C - System and method for realizing dynamic cascading of lines - Google Patents

Abstract

The present invention provides a system and a method for implementing dynamic cascade connection of lines. The system at least comprises a first multipoint control unit, a second multipoint control unit and a time slot processing device, wherein the time slot processing device is used for selecting idle time slots, separating the idle time slots, combining the idle time slots into a data channel, and achieving data transmission by the data channel. In the time slot multiplexing mode used through lines, the multipoint control units provide multiple pairs of cascade connection ports. The method comprises: selecting idle time slots in the time slots of lines; separating the idle time slots; assigning the time slots separated to the cascade connection ports; achieving data transmission through the cascade connection ports. Compared with the prior art, the present invention has the advantages that one path of line between the multipoint control units provides multiple pairs of cascade connection ports for the multipoint control units without the need of other devices to reduce cost, and the present invention provides cascade connection ports for cascaded conferences with various speed rate in a real-time way to enhance flexibility and fully utilizes precious line bandwidth.

Description

System and method for realizing dynamic cascading of lines

technical field

The invention relates to the field of multimedia conferencing television, in particular to a system and method for realizing dynamic cascading of lines.

Background technique

In the practical application of video conferencing, for the vast majority of users who use E1 (a line with a transmission rate of 2M) line cascading between two MCUs (Multi-point Control Units), when it is necessary to hold a cross- During the cascading conference of two MCUs, one E1 line cascading port of each MCU will be occupied regardless of the rate of the cascading conference being held. However, in the prior art, the 32 time slots of the E1 line can only be used uniformly, and the other time slots cannot be used if one is occupied, thus causing a waste of line resources.

A specific example is shown in Figure 1a. When a 128K cascade conference is held between MCU1 and MCU2, the entire 2M bandwidth of E1 needs to be occupied. The bandwidth usage is shown in Figure 1b, which means that no matter what the rate of the meeting is, it needs to occupy 2M bandwidth, thus causing a huge waste of bandwidth.

In addition, in the prior art, there is also a method of configuring time slot extraction devices at both ends of the E1 line. This method uses channel technology to occupy N time slots at the same time to obtain a rate of N×64kbps. The terminal configures time slot extraction equipment, which increases the operating cost.

Contents of the invention

The invention provides a system and method for realizing dynamic cascading of lines to solve the shortcomings of wasting bandwidth and high cost in the prior art.

To achieve the above object, the present invention adopts the following technical solutions:

A system for realizing dynamic cascading of lines, the system at least includes a first multi-point control unit, a second multi-point control unit, and a time slot processing device, the time slot processing devices are respectively connected to the multi-point control unit, and Selecting free time slots from the lines, separating the free time slots, and combining the free time slots into data channels through which the multipoint control unit performs data transmission.

The time slot processing device includes:

A time slot selection device for selecting an idle time slot in the line;

A time slot separation device, configured to receive the free time slot transmitted by the time slot selection device, and separate the free time slot;

A time slot combination device, configured to receive the separated free time slots transmitted by the time slot separation device, and combine the separated free time slots into data channels; and

The data transmission device is used to enable the cascade port to perform data transmission through the data channel.

The above time slot processing device is used to dynamically provide cascade ports for the multipoint control unit.

The present invention also provides a method for realizing dynamic cascading of lines, the method comprising the following steps:

The time slot processing device selects an idle time slot in the line;

Separate free time slots;

combining the separated time slots into data lanes; and

The multi-point control unit performs data transmission through the data channel.

The above method for implementing dynamic cascading of lines is used to dynamically provide cascading ports for the multi-point control unit.

The above-mentioned method for realizing line dynamic cascading also includes configuring corresponding ports as virtual primary rate interface (PRI) ports; assigning numbers to corresponding ports; and realizing dynamic cascading of line ports by means of virtual primary rate PRI cascading. The time slot in the line is divided into at least one B channel and at least one D channel, preferably thirty B channels and two D channels, wherein one D channel is used as a signaling channel for transmitting signaling; the signaling Using the Q.931 protocol, configure at least two MCUs as the network side and the user side respectively; when a cascade conference is held, one MCU initiates a call to other MCUs, and each call occupies at least one B channel; when the conference ends, release the Channel B. It is also possible to use a time slot exchange device to directly extract free time slots from the time slots of the line.

The system and method provided by the invention can be used for E1 lines and T1 lines.

The present invention uses time slot multiplexing to provide multiple pairs of cascaded ports for the MCUs. Although lines are used to connect the MCUs, the corresponding port types are configured as virtual PRI ports, and virtual phone numbers are assigned to the corresponding ports. , or use a time slot exchange device to extract idle time slots, realizing dynamic cascading of lines, compared with the prior art, it has the following advantages:

1. Provide multiple pairs of cascading ports for the MCU through a line between the MCUs;

2. There is no need to add other equipment, which reduces the cost and improves the stability;

3. Provide cascading ports for cascading conferences at various rates in real time, improving flexibility; and

4. Make full use of the precious line bandwidth.

Brief description of the drawings

Figure 1a is a schematic diagram of an existing cascade technology implementation;

Figure 1b is a schematic diagram of the bandwidth usage of the existing cascading technology implementation scheme;

Fig. 2 is a schematic diagram of the working principle of the time slot processing device of the present invention;

Fig. 3 is a structural diagram of the time slot processing device of the present invention;

Fig. 4 is the schematic diagram of the method that the present invention realizes E1 circuit dynamic cascading;

Fig. 5 is the flow chart of the method that the present invention realizes E1 circuit dynamic cascading;

Fig. 6 a is the schematic diagram that adopts virtual PRI port mode to realize E1 line port dynamic connection;

Fig. 6b is a schematic diagram of the bandwidth usage of the dynamic connection of the E1 line port by means of a virtual PRI port; and

Fig. 7 is a schematic diagram of implementing dynamic connection of E1 line ports by using a time slot switching device.

Detailed ways

The core idea of the time slot processing device and the method for implementing dynamic cascading of lines provided by the present invention is to provide multiple pairs of cascading ports by multiplexing time slots on the lines.

Fig. 2 is a schematic diagram of the working principle of the time slot processing device of the present invention. MCU1 22 and MCU2 24 are connected through the E1 line, and the time slot processing device 10 is connected with the MCU1 22 and MCU2 24, and the idle time slot selected from the E1 line is separated from the idle time slot, and the idle time slot is combined into a data channel , so that MCU1 22 and MCU2 24 communicate through the data channel formed by free time slots.

Fig. 3 is a structural diagram of the time slot processing device of the present invention. The time slot processing device 10 includes a time slot selection device 12, a time slot separation device 14, a time slot combination device 16 and a data transmission device 18, and the time slot selection device 12 is used to select an idle time slot in an E1 circuit; the time slot Separating device 14 is used for receiving the free time slot that time slot selecting device transmits, and separates free time slot; The separated idle time slots are combined into a data channel; the data transmission device 18 is used to enable the cascade port to perform data transmission through the data channel. The time slot selection device 12, the time slot separation device 14 and the time slot combination device 16 can use the relevant modules in the communication circuit chip (as the model produced by MITEL is the chip of MT8985AP), and the data transmission device 18 can use the VIEWPOINT8620 of the Huawei TV system. The line interface module in the E16 single board.

Fig. 4 is a schematic diagram of a method for realizing dynamic cascading of E1 lines according to the present invention. Conference 1 occupies slot 32, slot 34, slot 36, and slot 38, where slot 36 is a free slot. Conference 2 uses the free time slot 36 of the time slot occupied by conference 1 by time slot multiplexing the E1 line. In the same way, meeting 4 can also use the free time slot 39 of the time slot occupied by meeting 3, and the process of time slot multiplexing can be completed using the time slot processing device shown in Figure 3, or the time slot shown in Figure 6 can be used The swap device is complete.

Fig. 5 is a flow chart of the method for realizing dynamic cascading of E1 lines in the present invention.

The method for realizing the dynamic cascading of E1 lines in the present invention includes the following steps: using a time slot selection device to select a free time slot in the time slots of the line; using a time slot separation device to separate the idle time slot; using a time slot combination device to separate The time slots are combined into a data channel; and the data transmission device is used to transmit data through the data channel. The above steps of selecting time slots, separating time slots and combining time slots can be realized by using relevant modules in the communication circuit chip (such as the model MT8985AP chip produced by MITEL company), and the steps of data transmission can be realized by using Huawei TV system VIEWPOINT8620 Realized by the line interface module in the E16 single board.

Fig. 6a is a schematic diagram of implementing dynamic connection of E1 line ports by means of a virtual PRI port. Though also adopt E1 line to connect between multipoint control unit MCU1 and MCU2, the E1 port of corresponding port type is configured as virtual PRI port type, for corresponding E1 port distribution number, this number is preferably a virtual telephone number, adopts The PRI cascading method realizes the dynamic cascading of E1 line ports. When a cascading conference is held on the MCU, the rate of the cascading line is occupied according to the rate of the conference, and other unoccupied rates can be occupied by other conferences. Use the PRI call to realize channel occupation. Divide 32 time slots of an E1 line into 30 B channels and two other channels. One of the two channels is used as a signaling channel and the other is reserved for other purposes. The signaling uses the Q.931 protocol, and the MCUs on both sides are configured as the network side and the user side respectively. When a cascade conference is held, one MCU initiates a call to another MCU on the cascade line, and the call can be initiated by either MCU. Each call occupies a B channel, and the rate of a B channel is 64K. At the end of the conference, a disconnection signal is sent to release the B channel. The following compares the technical solution shown in Figure 6a with the existing cascading technology implementation shown in Figure 1a. The E1 ports of MCU1 and MCU2 in Figure 1a are connected through E1 lines, even if a 128K cascading conference is held. Occupy the bandwidth of 2M, and adopt the technical scheme in Fig. 6 a to solve this problem, use virtual PRI port to communicate through E1 line between MCU1 22 and MCU2 24, have realized the dynamic cascading of E1 line, hold the cascading of 128K The meeting only takes up 128K of bandwidth.

Fig. 6b is a schematic diagram of the bandwidth usage of the dynamic connection of E1 line ports realized by adopting the virtual PRI port mode. 52 is the bandwidth occupied by conference 1, 54 is the bandwidth occupied by conference 2, 56 is the bandwidth occupied by conference 3, and 58 is the bandwidth occupied by conference 4. It can be seen from Figure 6b that when a cascaded conference is held, how much is actually used by the conference The bandwidth is as much as the bandwidth is occupied, which overcomes the problem that the unused bandwidth cannot be occupied by other conferences. Compared with Figure 1b, it can be clearly seen that the utilization rate of the bandwidth has been greatly improved.

Fig. 7 is a schematic diagram of implementing dynamic connection of E1 line ports by using a time slot switching device. In addition to the above scheme, the time slot switching device 60 can also be used to directly extract the relevant time slots in the 2M time slots, and combine them into various cascading ports to realize the dynamic connection of E1 line ports. The time slot switching device can be a commercial time slot switching chip.

Although the embodiments of the present invention are directed to E1 lines, it is obvious to those skilled in the art that the system and method provided by the present invention can be applied to T1 lines and other similar lines.

The system and method of the present invention have been successfully applied to the VIEWPOINT8620 of Huawei's video conference system, which greatly improves the utilization rate of E1 cascading ports and saves line costs for operators.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the claims of the present invention.

Claims (12)

1. realize the system of circuit dynamic cascading, at least comprise first multipoint control unit, second multipoint control unit, it is characterized in that also comprising the time slot processing unit, described time slot processing unit is connected with described multipoint control unit respectively, and from circuit, select idle time slot, the idle time slot of separation, then idle time slot is combined into data channel, described multipoint control unit carries out transfer of data by described data channel.

2. system according to claim 1 is characterized in that described time slot processing unit comprises:

Time slot selection device is used for selecting the idle time slot of circuit;

The time slot separator is used to receive the idle time slot that described time slot selection device transmits, and described idle time slot is separated;

The time slot composite set is used to receive the idle time slot of separating that described time slot separator transmits, and the described idle time slot of separating is combined as data channel; And

Data transmission device is used to make the cascade port to carry out transfer of data by described data channel.

3. system according to claim 1 is characterized in that described time slot processing unit is used to multipoint control unit that the cascade port dynamically is provided.

4. system according to claim 2 is characterized in that described time slot processing unit is used to multipoint control unit that the cascade port dynamically is provided.

5. according to arbitrary described system in the claim 1 to 4, wherein said circuit is the E1 circuit.

6. according to arbitrary described system in the claim 1 to 4, wherein said circuit is a T1 line.

7. realize the method for circuit dynamic cascading, it is characterized in that may further comprise the steps:

A) the time slot processing unit is selected the idle time slot in the circuit;

B) idle time slot is separated;

C) the described time slot of separating is combined into data channel; And

D) described multipoint control unit carries out transfer of data by described data channel.

8. method according to claim 7 is characterized in that described method is used to multipoint control unit that the cascade port dynamically is provided.

9. method according to claim 7 is characterized in that using the time gas exchange device to extract idle time slot from the time slot of circuit, realizes the circuit dynamic cascading.

10. method according to claim 9 is characterized in that described time gas exchange device is the time gas exchange chip.

11. according to arbitrary described method in the claim 7 to 10, wherein said circuit is the E1 circuit.

12. according to arbitrary described method in the claim 7 to 10, wherein said circuit is a T1 line.

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