CN1901519A - Optimizing system and method for medium transmission on different transmission channels - Google Patents
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Abstract
This invention puts forward a media transmission optimizing system on different transmission channels and an optimized method including a resource preserved protocol module set on network transmission nodes, a resource management module and a code rate conversion module, in which, the resource preservation module transmits the control message with QoS parameters based on the resource preservation protocol to realize dynamic transmission of preservation resources and code rate conversion to the media to increase the usability of network resources.
Description
Technical field
The invention belongs to the multi-media network transmission technique field, particularly relate to multimedia data stream optimal way during by different transmission channel in the network of isomery.
Technical background
The fast development of modern communication technology makes the Network Transmission of multimedia messages become possibility.But, how provide to insert to support it is the current problem that solves of needing for user with different access waies and bandwidth resources.Each user's access way is an isomery, might also might be to use narrow band access by broadband access promptly, and simultaneously, each user is in disposal ability, and the aspects such as quality requirement of capacity of memory device and receiving media there are differences.How to overcome these differences, use feature that adaptive Bit-Rate Control Algorithm technology adjusts data flow to be wherein a kind of mode to satisfy available network resources at present, the present invention overcomes these difference by other approach.
Data flow because the isomerism of network and the variation of Internet resources operating position just are necessary data stream is carried out the work of corresponding code check transcoding, realizes effectively saving and making full use of bandwidth in transmission over networks, and reduces packet loss quantity.Before doing the work of code check transcoding, must solve two problems earlier:
(1), under which type of situation, carry out the code check transcoding?
(2), in the concrete work of transcoding, how many code checks of how rationally setting behind the transcoding is?
These two problems relate to service quality problem, i.e. QoS, in fact, support in conjunction with QoS, allow medium to carry out resource reservation, on different transmission channels, carry out the code check transcoding at network transmission process, can obtain reasonable effect, make user's data flow obtain the QoS guarantee.
Summary of the invention
The object of the present invention is to provide a kind of media network transmission optimization system that realizes the service quality QoS support by RSVP RSVP.
Another object of the present invention is to according to this transmission optimization system, a kind of media network transmission optimization method is provided.
In order to realize goal of the invention one, the technical scheme of employing is as follows:
A kind of media delivery optimization system on different transmission channels comprises the RSVP module, resource management module and the code check modular converter that are arranged on the transport network node;
Described RSVP module adopts RSVP to transmit the control message that comprises qos parameter in order to the transmission path along transmit leg to the recipient;
Described resource management module is that media delivery is reserved and the required resource of dynamic assignment, is included in the media delivery path and sets up the initial stage, reserves end-to-end resource, and during media delivery, changes and the dynamic assignment resource according to the qos parameter of controlling message;
Described code check modular converter can be realized the code check conversion of medium.
Described RSVP module RSVP is responsible for controlling the transmission of message, and qos parameter is transmitted in the path along transmit leg to the recipient, reserves and keep the resource that provides service required.
RSVP mainly sends two classes control message: PATH class signaling and RESV class signaling.Wherein, PATH class signaling comprises transmitting terminal to the routing iinformation of receiving terminal and to the description of business, as Mean Speed, and peak rate, bag is long, maximum delay etc.Sent by the source end by IPv4 or IPv6 agreement or udp protocol encapsulation back, pass to receiving terminal and set up the transmission path of media stream through router.When receiving terminal is received PATH class signaling, and when needing reserve resource, then return RESV class signaling, through router with the connectionless-mode reserve resource.When the reservation failure, router returns the RESVERROR signaling, so that receiving terminal and transmitting terminal are suitably handled.
What be worth to propose is, actual resource reservation and RSVP are irrelevant, that is to say, and RSVP itself can not really realize the communicating by letter reservation and the configuration of resource requirement, real realization is to be finished by the resource management module in the node.In the networked multimedia system, resource management module comprises explorer and resource management protocols, resource management protocols is used for the resource information that between explorer exchange resource administrative institute needs, and explorer then is used for realizing solving required resource allocation of resource contention and reservation management function.
For each data flow, the qos parameter of user's appointment is implying and resource mapping, it is the transmission reserved resource of data flow according to qos parameter that optimization system of the present invention requires node, by transmission between the resource management module of each node with consult these qos parameters, each node resource administration module is checked its other resources utilization, and determine whether to allow reservation request, whether decision carries out the code check transcoding to some data flow as the case may be.
In the technique scheme, described resource management module comprises qos parameter mapping block and qos parameter negotiation module;
Described qos parameter mapping block is mapped as the parameter value of application layer with the qos parameter of user's appointment, again the application layer parameter value is mapped to the range of parameter values of transport layer, and gets occurrence in transport layer parameters value scope;
Described qos parameter negotiation module is dynamically adjusted qos parameter, and according to adjusted parameter Resources allocation.
Resource management module is checked utilization of resources situation, is used for realizing solving required resource allocation of resource contention and reservation management function.The main purpose of resource management provides the resource guarantee of reliable data transmission, this means that resource management should have following function at least:
1., set up the initial stage, reserve and distribute end-to-end resource, so that code stream can be by the QoS demand transmission of user's appointment, this just requires between each system component that participates in transfer of data transmission and consults these qos parameters in the data flow transmission path.
2., during transfer of data, network and system can provide resource according to qos parameter, this just requires and can use appropriate service principle to realize resource allocation according to qos parameter.Network and system should be able to adapt to the variation of resource, and this just requires to possess the mechanism of supporting the qos parameter dynamic change, can be by network and user's the qos parameter of consulting to reach again approval again.
Therefore, resource management module should comprise qos parameter mapping block and qos parameter negotiation module.
QoS is an overall target, is used to weigh the satisfaction of using a service.Different multimedia application requires to have different demands for services, so must be with these service parameterizations.The QoS request that the user proposes is some simple descriptions, as relatively poor,, better, preferably wait.QoS consults and permission control in order to be undertaken by RSVP, user QoS must be mapped as application layer QoS, and application layer QoS is mapped to transport layer QoS again, and that has been exactly one group of concrete QoS index.The function of qos parameter mapping block is: at first the user is proposed such as excellent, good, can accept, whether can reduce abstract quality of service requirements such as qos requirement, minimum requirements and be mapped to application layer, the application layer parameter value is mapped in the reasonable value scope of transport layer parameters by mapping function, then according to network condition value in this mapping scope reasonably.So just can in end host computer system and intermediate node, utilize RSVP to do the fine granularity request, as bandwidth, delay, delay jitter etc., change according to network state simultaneously and can correspondingly adjust value interior between map section, like this from holding host computer system to just setting up a communication link comparatively stable, that guarantee service quality the border networks router.
The qos parameter negotiation module is responsible for the negotiation of the qos requirement of customer traffic.When Internet resources can not satisfy the desirable qos requirement of user, then the information of setting according to network condition and user was adjusted the qos parameter of data flow.
Described qos parameter negotiation module comprises fitness function and resource management function;
Described fitness function is used for the variation according to the network bandwidth resources state, dynamically adjusts the qos parameter index on different transmission channels; In the time can't keeping predetermined QoS, whether some information that fitness function provides according to the user can reduce etc. as the QoS index, consult with the resource management function, QoS is adjusted to a suitable value move.When the bandwidth resources state variation, on different transmission channels, fitness function also can be adjusted the QoS index, for example can adjust the code check of data flow etc., and better service quality is provided.
The change in resources of the automatic monitor network node of described resource management function, real-time update resource allocation table and list of available resources; Also according to the adjusted qos parameter Resources allocation of fitness function.The resource management function can the automatic monitored control system resource variation, comprise the variation of network state, upgrade resource allocation table and list of available resources in real time; Can also comprise that the result that fitness function is consulted uses resource allocation to data flow according to the QoS request of using and the priority of data flow.
Described RSVP module is provided with admits control module and strategic control module, described admittance control module checks whether node has enough resources and set up resource reservation, and whether described strategic control module inspection has the authority of initiating this resource reservation request.
The qos parameter of the customer traffic after code check modular converter of the present invention is consulted according to resource management module is formulated corresponding transcoding strategy, the work that the specific implementation code check is adjusted.
In order to realize goal of the invention two, the technical scheme of employing is as follows:
A kind of media delivery optimization method on different transmission channels comprises the optimization of Transport endpoint and the optimization of intermediate node;
The optimization of described Transport endpoint comprises traditional Internet communication process and QoS control procedure, traditional Internet communication process realizes that Internet goes up transfer of data and control service, the QoS control procedure realizes the control message transmissions based on RSVP, and according to the qos parameter negotiation of control message and the service quality of control different application Media Stream, making end points is that Media Stream is reserved the required resource of this service quality of realization;
The optimization of described intermediate node is dynamically adjusted the resource allocation of media flow transmission by according to the control message based on RSVP.
In the technique scheme, the concrete operations of described QoS control procedure comprise the steps:
(1), the user consults the qos requirement grade that the interface proposes data flow by QoS, call the qos parameter mapping block, user's requirement is mapped as transport layer parameters, then according to network condition value in the mapping scope reasonably, and specify can demote and demote qos requirement tactful;
(2), transmit qos parameter by RSVP to node by the recipient;
(3), in wait node resource reservation result, the resource of reservation transmission end dot system;
(4), successfully, then receiving terminal sends grouped data downstream as resource reservation in node and the transmission end dot system; Otherwise send reservation request tear down message and path tear down message, set up new path, return step (2) operation.
Described step (2) also comprises by the qos parameter negotiation module, carries out the dynamic reservation of resource.
The optimization of described intermediate node specifically comprises the steps:
(a), transmit the message that has qos parameter by the RSVP module and propose QoS resource reservation demand to node;
(b), after node is received the QoS demand, this request is passed to the admittance control module and the strategic control module of node by the RSVP module, admit control module to check whether this node has enough resources and set up new resource reservation, strategic control module checks whether this application has the authority of initiating this QoS resource reservation request;
(c) if admit the inspection of control module and strategic control module all to pass through, then this QoS resource reservation request information will further be sent to upstream node, and set up corresponding transfer path; If do not have the authority of initiating the QoS resource reservation request, then the node refusal is set up transfer path, sends the reservation request error message to receiving terminal; Node does not have enough resources to set up resource reservation if having the authority of initiating the QoS resource reservation request, then consult the code check conversion by the qos parameter negotiation module, if consult successfully, the qos requirement after enough resources satisfy negotiation is arranged, just can be by admitting the inspection of control module; If the merit of failing to consultations will refuse to set up transfer path, send the reservation request error message to receiving terminal;
(d), then can carry out media delivery by this path if node has been set up transfer path.
The qos parameter negotiation module course of work of described step (c) is specific as follows:
Step 1, the user applies qos parameter is mapped to application layer qos parameter index, the application layer parameter index is mapped in the span of transport layer parameters;
Step 2, startup resource management module, whether check has enough resources and authority to accept this QoS request;
If Step 3 can accept this QoS request, the process of then deactivating; Otherwise start fitness function and adjust the QoS index;
If Step 4 adjusted QoS indexs are not less than minimum qos requirement, then return Step 2 operations; Otherwise transmission error message.
The code check conversion of step (c) realizes by the code check modular converter.
The present invention transmits by the qos parameter based on RSVP, can reserve before transmission and in the transmission course and dynamic assignment transmission resource requirement, realizes effectively saving and making full use of Internet resources, reduces packet loss quantity, guarantees the QoS of data flow.Have following characteristics:
(1), determines whether carrying out the code check transcoding in conjunction with the RSVP RSVP.If the reservation request that proposes is allowed to, then needn't carry out the code check transcoding.
(2), utilize the resource management protocols of Resource Manager Subsystem, and call the qos parameter negotiation module, the qos parameter of transmission and negotiation data stream between each explorer, and decide the concrete work of code check transcoding according to qos parameter, determination data stream is in the code check situation of change of transcoding front and back.
(3), qos parameter consults to have adopted the thought of some " self adaptations ", promptly trying one's best adapts to user's requirement, makes full use of network bandwidth resources; In the time can not satisfying user's desirable demand, reduce qos requirement step by step.On different transmission channels, when the bandwidth resources of certain section channel can satisfy the desirable code check of user's setting, then the qos parameter of this data flow on this section channel is adjusted into the desirable qos parameter that the user sets.
Description of drawings
Fig. 1 is system framework figure of the present invention;
Fig. 2 is a workflow diagram of the present invention.
Embodiment
The present invention is described further below in conjunction with accompanying drawing.
System framework figure of the present invention is provided with explorer, RSVP module, code check modular converter as shown in Figure 1 on end points and intermediate node.
The RSVP module is by the control message of RSVP transmission qos parameter, and RSVP mainly sends two classes control message: PATH class signaling and RESV/RESVERROR class signaling.
Also can intercom mutually between the explorer, to reserve and the dynamic assignment resource.
Workflow of the present invention as shown in Figure 2, the transmitting terminal main frame sends PATH class signaling and passes to receiving terminal and set up the transmission path of media stream through intermediate nodes such as routers.Receive PATH class signaling when receiving terminal, just begin reserve resource, earlier upwards an intermediate node sends reservation request information, i.e. RESV class signaling, this reservation request information have comprised this receiving terminal specific data stream qos parameter of asking for this reason.RSVP processing module on the node passes to resource reservation request the admittance control and the strategic control module of this node, admit control module to check whether this router has enough resources and set up new resource reservation, strategic control module checks whether this application has the authority of initiating this QoS resource reservation request, to determine whether setting up corresponding RSVP soft state to this Media Stream; If this application does not have the authority of initiating this QoS resource reservation request, then refusal is set up corresponding RSVP soft state for this Media Stream, sends the reservation request error message to receiving terminal, i.e. RESVERROR class signaling; If above-mentioned these two inspections have all been passed through, this node will use filter parameter information that the packet queue device is provided with, and packet classifiers belongs to the grouping of this data flow with identification then, and packet scheduler will obtain its needed QoS; This reservation request information will further be sent to upstream node, until reaching transmitting terminal, set up corresponding transfer path; If this node does not have enough resources to set up new resource reservation, the explorer of this node will call the QoS negotiation module, send corresponding signaling request and will reduce qos requirement, for example with the code check transcoding of data flow; If bandwidth resources can satisfy the code check requirement after the reduction, then accept this reservation request, and this reservation request is sent to upstream node, if bandwidth resources still can not satisfy user's minimum qos requirement, just this node sends the reservation request error message to receiving terminal.After receiving terminal is received error message, send reservation request to transmitting terminal and remove information, require that All hosts and router are deleted corresponding resource reservation state on the way, after transmitting terminal is received reservation request dismounting information, send the path along down direction to receiving terminal and remove information, transmitting terminal is retransmitted routing information, set up a new route to receiving terminal, carry out the resource reservation work on this paths again, do not set up the qos requirement of an energy yet if surpass the regular hour by the user, comprise that the qos requirement after the negotiation carries out the path of data flow transmission, then select whether to stop this application by the user; If reservation request has arrived transmitting terminal, mean that then each intermediate node in the path has all been set up the required resource reservation of this data flow, comprise the resource reservation after QoS consults, then can beginning downstream, receiving terminal sends grouping.In data transmission procedure, packet classifiers in each router and packet scheduler are responsible for guaranteeing that each grouping in this data flow can transmit according to its desired qos parameter.The qos parameter of same data flow may be different on different transmission channels, then mean to transmit data according to the code check behind the transcoding again on this section channel after carrying out the work of code check transcoding on the node corresponding.
As carrying out the transmission of data flow by Internet between user A and the user B, the party B-subscriber consults the qos requirement that the interface proposes data flow by QoS, the requirement stream rate is 150kb/s, and be set at " can reduce qos requirement ", minimum requirements is " 80kb/s ", the end main frame of A sends the Path signaling, on network, set up a path earlier to the end main frame of B, comprise several intermediate nodes, after the B termination is received PATH class signaling, begin reserve resource then, send reservation request information RESV class signaling to contiguous intermediate node C in upstream, RSVP processing module on the node passes to resource reservation request the admittance control and the strategic control module of this node, admit control module to check whether this router has enough resources and set up new resource reservation, strategic control module checks whether this application has the authority of initiating this QoS resource reservation request, this application has the authority of initiating this QoS resource reservation request, and this router does not have enough resources to set up this resource reservation, then the explorer of this node will send corresponding signaling request reduction qos requirement, call the QoS negotiation module, return a qos requirement that rationally can be met, the code check of data flow when this section transmission channel changed into the code check of 120kb/s, this router is accepted this reservation request so, and this reservation request is sent to another upstream node D, RSVP processing module on the D node also passes to resource reservation request the admittance control and the strategic control module of this node and checks, this application has the authority of initiating this QoS resource reservation request, and this router does not have enough resources to set up this resource reservation, then the explorer of this node will send corresponding signaling request reduction qos requirement, call the QoS negotiation module, because this section Internet resources are limited, can only allow to reserve the bandwidth resources of 50kb/s, can't satisfy user's minimum qos requirement, the D node just sends reservation request error message RESVERROR class signaling to receiving terminal, after receiving terminal is received this error message, just send reservation request and remove information, send to transmitting terminal, require that All hosts and router and main frame are deleted corresponding resource reservation state on the way, after transmitting terminal is received reservation request dismounting information, send the path along down direction to receiving terminal and remove information, transmitting terminal is retransmitted routing information PATH class signaling, set up a new route, carry out the resource reservation work on this paths again to receiving terminal; On new path, all nodes all can satisfy the user qos requirement, comprise the qos requirement after consulting and consulting again, thereby utilize this path to carry out data flow transmission.
Claims (10)
1, a kind of media delivery optimization system on different transmission channels is characterized in that comprising the RSVP module, resource management module and the code check modular converter that are arranged on the transport network node;
Described RSVP module adopts RSVP to transmit the control message that comprises qos parameter in order to the transmission path along transmit leg to the recipient;
Described resource management module is that media delivery is reserved and the required resource of dynamic assignment, is included in the media delivery path and sets up the initial stage, reserves end-to-end resource, and during media delivery, changes and the dynamic assignment resource according to the qos parameter of controlling message;
Described code check modular converter can be realized the code check conversion of medium.
2, the media delivery optimization system on different transmission channels according to claim 1 is characterized in that described resource management module comprises qos parameter mapping block and qos parameter negotiation module;
The qos parameter that described qos parameter mapping block will be controlled user's appointment of message is mapped as the parameter value of application layer, the application layer parameter value is mapped to the range of parameter values of transport layer again, and gets occurrence in transport layer parameters value scope;
Described qos parameter negotiation module is dynamically adjusted qos parameter, and according to adjusted parameter Resources allocation.
3, the media delivery optimization system on different transmission channels according to claim 2 is characterized in that described qos parameter negotiation module comprises fitness function and resource management function;
Described fitness function is used for the variation according to the network bandwidth resources state, dynamically adjusts the qos parameter index on different transmission channels;
The change in resources of the automatic monitor network node of described resource management function, real-time update resource allocation table and list of available resources; Also according to the adjusted qos parameter Resources allocation of fitness function.
4, the media delivery optimization system on different transmission channels according to claim 1, it is characterized in that described RSVP module is provided with admittance control module and strategic control module, described admittance control module checks whether node has enough resources and set up resource reservation, and whether described strategic control module inspection has the authority of initiating this resource reservation request.
5, a kind of media delivery optimization method on different transmission channels that adopts the described optimization system of claim 1 is characterized in that comprising the optimization of Transport endpoint and the optimization of intermediate node;
The optimization of described Transport endpoint comprises traditional Internet communication process and QoS control procedure, traditional Internet communication process realizes that Internet goes up transfer of data and control service, the QoS control procedure realizes the control message transmissions based on RSVP, and according to the qos parameter negotiation of control message and the service quality of control different application Media Stream, making end points is that Media Stream is reserved the required resource of this service quality of realization;
The optimization of described intermediate node is dynamically adjusted the resource allocation of media flow transmission by according to the control message based on RSVP.
6, the media delivery optimization method on different transmission channels according to claim 5 is characterized in that the concrete operations of described QoS control procedure comprise the steps:
(1), the user consults the qos requirement grade that the interface proposes data flow by QoS, call the qos parameter mapping block, user's requirement is mapped as transport layer parameters, then according to network condition value in the mapping scope reasonably, and specify can demote and demote qos requirement tactful;
(2), transmit qos parameter by RSVP to node by the recipient;
(3), in wait node resource reservation result, the resource of reservation transmission end dot system;
(4), successfully, then receiving terminal sends grouped data downstream as resource reservation in node and the transmission end dot system; Otherwise send reservation request tear down message and path tear down message, set up new path, return step (2) operation.
7, the media delivery optimization method on different transmission channels according to claim 6 is characterized in that described step (2) also comprises by the qos parameter negotiation module, carries out the dynamic reservation of resource.
8, the media delivery optimization method on different transmission channels according to claim 5 is characterized in that the optimization of described intermediate node specifically comprises the steps:
(a), transmit the message that has qos parameter by the RSVP module and propose QoS resource reservation demand to node;
(b), after node is received the QoS demand, this request is passed to the admittance control module and the strategic control module of node by the RSVP module, admit control module to check whether this node has enough resources and set up new resource reservation, strategic control module checks whether this application has the authority of initiating this QoS resource reservation request;
(c) if admit control module and strategic control module all to pass through, then this QoS resource reservation request information will further be sent to upstream node, and set up corresponding transfer path; If do not have the authority of initiating the QoS resource reservation request, then the node refusal is set up transfer path, sends the reservation request error message to receiving terminal; Node does not have enough resources to set up resource reservation if having the authority of initiating the QoS resource reservation request, then consult the code check conversion by the qos parameter negotiation module, if consult successfully, the qos requirement after enough resources satisfy negotiation is arranged, just can be by admitting the inspection of control module; If the merit of failing to consultations will refuse to set up transfer path, send the reservation request error message to receiving terminal;
(d), then can carry out media delivery by this path if node has been set up transfer path.
9, the media delivery optimization method on different transmission channels according to claim 8 is characterized in that the qos parameter negotiation module course of work of described step (c) is specific as follows:
Step 1, the user applies qos parameter is mapped to application layer qos parameter index, the application layer parameter index is mapped in the span of transport layer parameters;
Step 2, startup resource management module, whether check has enough resources and authority to accept this QoS request;
If Step 3 can accept this QoS request, the process of then deactivating; Otherwise start fitness function and adjust the QoS index;
If Step 4 adjusted QoS indexs are not less than minimum qos requirement, then return Step 2 operations; Otherwise transmission error message.
10, the media delivery optimization on different transmission channels according to claim 8 is characterized in that the code check conversion of described step (c) realizes by the code check modular converter.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101815210A (en) * | 2010-03-29 | 2010-08-25 | 广东中大讯通信息有限公司 | Digital home remote video monitoring system based on next-generation network |
| CN102722414A (en) * | 2012-05-22 | 2012-10-10 | 中国科学院计算技术研究所 | Input/output (I/O) resource management method for multi-root I/O virtualization sharing system |
| CN102739509A (en) * | 2011-04-15 | 2012-10-17 | 北京市翌晨通信技术研究所 | Method for controlling QoS of IP network by setting bandwidth resource reservation points on existing path |
| CN106656963A (en) * | 2016-09-30 | 2017-05-10 | 邦彦技术股份有限公司 | Multi-channel communication system, module and method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1248431B1 (en) * | 2001-03-27 | 2007-10-31 | Sony Deutschland GmbH | Method for achieving end-to-end quality of service negotiation for distributed multimedia applications |
| CN100488106C (en) * | 2003-10-17 | 2009-05-13 | 中国科学院计算技术研究所 | Adaptive service quality ensuring method in multi-playing environment |
| US20080004027A1 (en) * | 2004-11-23 | 2008-01-03 | Zte Corporation | Method and System for Delaminatly Ensuring the Network Service Quality |
| CN100442703C (en) * | 2005-01-05 | 2008-12-10 | 华为技术有限公司 | Method for transmitting service flow in supporting network |
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2006
- 2006-07-25 CN CNB2006100366649A patent/CN100502370C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101815210A (en) * | 2010-03-29 | 2010-08-25 | 广东中大讯通信息有限公司 | Digital home remote video monitoring system based on next-generation network |
| CN102739509A (en) * | 2011-04-15 | 2012-10-17 | 北京市翌晨通信技术研究所 | Method for controlling QoS of IP network by setting bandwidth resource reservation points on existing path |
| CN102722414A (en) * | 2012-05-22 | 2012-10-10 | 中国科学院计算技术研究所 | Input/output (I/O) resource management method for multi-root I/O virtualization sharing system |
| CN106656963A (en) * | 2016-09-30 | 2017-05-10 | 邦彦技术股份有限公司 | Multi-channel communication system, module and method |
| CN106656963B (en) * | 2016-09-30 | 2021-05-18 | 邦彦技术股份有限公司 | Multi-channel communication system, module and method |
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| CN100502370C (en) | 2009-06-17 |
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