CN102938743A

CN102938743A - Data transmission method and device

Info

Publication number: CN102938743A
Application number: CN2012104063689A
Authority: CN
Inventors: 赵翠; 朱里越; 崔竞飞; 欧阳峰
Original assignee: Academy of Broadcasting Science of SAPPRFT
Current assignee: National news publishes broadcast research institute of General Bureau of Radio, Film and Television
Priority date: 2012-10-23
Filing date: 2012-10-23
Publication date: 2013-02-20
Anticipated expiration: 2032-10-23
Also published as: CN102938743B

Abstract

The invention provides a data transmission method and device. The data transmission method comprises the following steps of: receiving a business signal, wherein the business signal carries a signal type and the signal type comprises a broadcasting signal or a data signal; a requirement of transmission of the broadcasting signal on a quality of service (QoS) is higher than that on the data signal; judging a signal type of the business signal; and if judging that the business signal is the broadcasting signal, loading the broadcasting signal to a transmission resource for transmitting the broadcasting signal and sending to all terminal modules so that the all terminal modules can respectively receive the broadcasting signal on the transmission resource for transmitting the broadcasting signal. A coaxial cable wideband is accessed to a network to realize low-delaying and shaking broadcasting transmission to bear a unidirectional broadcasting business, so that a uniform technical scheme and a network framework are adopted to bear the unidirectional broadcasting business and a bidirectional broadcasting business at the same time; and therefore, a network structure is simplified, the complexity level of a network is reduced, the utilization rate of a bandwidth resource is improved and the data transmission method and device are good for technical requirements of a three-network fusion business.

Description

Data transmission method and device

Technical field

The present invention relates to radio and television and broadband data communication technology, relate in particular to a kind of data transmission method and device.

Background technology

Traditional cable TV network is the broadband integrated net of broadcasting and TV of point-to-multipoint tree network structure, has the downlink broadcast passage in broadband, adopt the frequency division multiple access technology to come division signals, be used for the transfer of unidirectional broadcasting service, need not congestion control, but two-way interactive be poor.Then need to utilize two-way access network to transmit for bi-directional data traffic, for example utilize EPON (Passive OpticalNetwork, PON) in conjunction with coaxial cable Technology of Ethernet Broadband Insertion (Ethernet over Coax, EOC) implementation, namely the PON+EOC technology realizes two-way access.

The present situation of current cable network is, professional for One-to-All Broadcasts such as live Digital Television, need to adopt based on digital video broadcasting (Digital Video Broadcasting, DVB) radio network transmits, the headend of the technology such as support DVB by being deployed in corridor or residential quarter optical node place, utilize the coaxial cable distribution net in the building or in the residential quarter that the One-to-All Broadcast business is sent to set-top box in the user family, after carrying out demodulation, output to television terminal; For two-way data, voice and video etc. based on Internet protocol (Internet Protocol, IP) data service, need to adopt the headend based on technology such as EOC, utilize two-way access network that data service is sent to terminal equipment in the user family, and the data that terminal equipment returns are sent to headend, thereby realize the bi-directional data traffic between headend and the terminal equipment.

When transmitting owing to and bi-directional data traffic professional to One-to-All Broadcast, need to utilize respectively the diverse technical system of two classes to realize, and be applied to respectively can not be compatible between the headend under the different technologies system, One-to-All Broadcast business of the prior art and bi-directional data traffic need to utilize respectively corresponding headend to transmit, and the complexity of network is higher.

Summary of the invention

The invention provides a kind of data transmission method and device, for reducing the complexity of the network of supporting simultaneously One-to-All Broadcast business and bi-directional data traffic transmission.

First aspect of the present invention provides a kind of data transmission method, comprising:

Receive service signal, carry signal type in the described service signal, described signal type comprises broadcast singal or data-signal, and the transmission of described broadcast singal is higher than described data-signal to the requirement of service quality QoS;

Judge the signal type that described service signal is affiliated;

Be broadcast singal if judge described service signal, then described broadcast singal is loaded into the transfer resource for the transmission broadcast singal, send to whole terminal modules, receive described broadcast singal at described transfer resource for the transmission broadcast singal respectively for described whole terminal modules.

Another aspect of the present invention provides a kind of data transmission method, comprising:

Receive the broadcast singal that the head end module sends at the transfer resource that is used for the transmission broadcast singal, to be described head end module judging after service signal is broadcast singal described broadcast singal, is loaded into described on the transfer resource of transmission broadcast singal; Perhaps

Receive the data-signal that described head end module sends at the transfer resource that is used for transmission of data signals, to be described head end module judging after service signal is data-signal described data-signal, is loaded into described on the transfer resource of transmission of data signals.

Another aspect of the present invention provides a kind of head end module, comprising:

Receiving element is used for receiving service signal, carries signal type in the described service signal, and described signal type comprises broadcast singal or data-signal, and the transmission of described broadcast singal is higher than described data-signal to the requirement of service quality QoS;

Judging unit is used for the signal type of judging that described service signal is affiliated;

Processing unit, be used for when judging described service signal and be broadcast singal, described broadcast singal is loaded into for the transfer resource that transmits broadcast singal, send to whole terminal modules, receive described broadcast singal at described transfer resource for the transmission broadcast singal respectively for described whole terminal modules.

Another aspect of the present invention provides a kind of terminal module, comprising:

Receiving element, be used for receiving the broadcast singal that the head end module sends at the transfer resource that is used for the transmission broadcast singal, to be described head end module judging after service signal is broadcast singal described broadcast singal, is loaded into described on the transfer resource of transmission broadcast singal; Perhaps

Another aspect of the present invention provides a kind of headend, comprises above-mentioned head end module.

Another aspect of the present invention provides a kind of terminal equipment, comprises above-mentioned terminal module.

Another aspect of the present invention provides a kind of communication system, comprises above-mentioned headend and terminal equipment.

Data transmission method provided by the invention and device, after receiving service signal, judge the affiliated signal type of this service signal, be broadcast singal if judge this service signal, then this broadcast singal is loaded into the transfer resource for the transmission broadcast singal, send to whole terminal modules, utilize the coaxial cable broadband access network to realize that the broadcasting transmitting of low delay and jitter is professional with the carrying One-to-All Broadcast, thereby can adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplified network configuration, reduced the complexity of network, improve the utilance of bandwidth resources, be conducive to the technical need of integration of three networks business.

Data transmission method provided by the invention and device, can receive the head end module is judging after service signal is broadcast singal, be loaded into for the broadcast singal that sends on the transfer resource of transmission broadcast singal or receive the head end module and judging after service signal is data-signal, be loaded into the data-signal that sends on the transfer resource for transmission of data signals, thereby realized utilizing coaxial cable broadband access network carrying One-to-All Broadcast professional, adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplified network configuration, reduced the complexity of network, improve the utilance of bandwidth resources, be conducive to the technical need of integration of three networks business.

Description of drawings

Fig. 1 is the flow chart of data transmission method one embodiment provided by the invention;

Fig. 2 is the flow chart of another embodiment of data transmission method provided by the invention;

Fig. 3 a is the flow chart of the another embodiment of data transmission method provided by the invention;

Fig. 3 b is the flow chart of the another embodiment of data transmission method provided by the invention;

Fig. 4 is the flow chart of the another embodiment of data transmission method provided by the invention;

Fig. 5 is the flow chart of the another embodiment of data transmission method provided by the invention;

Fig. 6 is the structural representation of head end module one embodiment provided by the invention;

Fig. 7 is the structural representation of another embodiment of head end module provided by the invention;

Fig. 8 is the structural representation of terminal module one embodiment provided by the invention;

Fig. 9 is the structural representation of another embodiment of terminal module provided by the invention;

Figure 10 is the structural representation of headend embodiment provided by the invention;

Figure 11 is the structural representation of terminal equipment embodiment provided by the invention;

Figure 12 a is the system construction drawing of communication system provided by the invention;

Figure 12 b is the schematic diagram of the logical channel of communication system provided by the invention.

Embodiment

Two-way access network can adopt the broadband access technology based on coaxial cable, and namely the EOC technology realizes bidirectional data communication.Wherein, the EOC technology comprises high-performance coaxial cable access network network (Highperformance Network Over Coax, HINOC), power line network (HomePlug AV), multimedia over Coax Alliance (Multimedia over CoaxAlliance, MoCA), HPNA Home Phoneline Networking Alliance (Home Phoneline Networking Alliance, HPNA) etc.Although the broadband access based on coaxial cable can realize that common ground is all to need to adopt headend and terminal equipment in two-way access network by the multiple technologies scheme, headend is connected by the coaxial cable distribution net network with terminal equipment.

Headend is deployed in the optical node place of corridor or residential quarter, links to each other with optical network unit (OpticalNetwork Unit, ONU); Terminal equipment is deployed in the user family, provides multiple interfaces to the user, but comprise connecting TV the radio frequency delivery outlet, can connect the Ethernet interface of computer etc.Realize communication connection by the coaxial cable distribution net network between headend and the terminal equipment.That is to say that on the network architecture, headend is connected with one or more terminal equipments by coaxial cable, utilize by ONU to be linked to network on the optical fiber.

The coaxial cable broadband access technology adopts point-to-multipoint star-like logical topological structure, and headend manages each terminal equipment that connects for the control node, and distributes bandwidth resources for it.Between headend and the terminal equipment, can adopt unicast technique to realize point-to-point communication, also can adopt multicasting technology to realize the communication of point-to-multipoint.

Present coaxial cable broadband access system can be supported the bi-directional data traffic such as online, Internet Protocol Television, IP phone, what adopt is the demand assigned Bandwidth sharing mechanism, that is to say, according to the size of data service needs occupied bandwidth, correspondingly distribute bandwidth resources for it.Because bi-directional data traffic is aspect user's experience, not very high to the requirement of real-time, therefore when the transmission bi-directional data traffic, the time-delay of certain limit and shake can be tolerated.

And the One-to-All Broadcast business such as live Digital Television having relatively high expectations to real-time, the time-delay of coaxial cable broadband access system when transmitting data service and the demand of the jittering characteristic service quality (Quality of Service, QoS) that is difficult to satisfy the One-to-All Broadcast business such as live Digital Television.Therefore, the cable TV signal for One-to-All Broadcast business such as live Digital Television need to adopt digital video broadcasting (Digital VideoBroadcasting, DVB) technology to transmit in other frequency range.The DVB technology adopts edge quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM) modulator is modulated, hybrid network (the Hybrid Fiber-Coaxial that combines via optical fiber and coaxial cable, HFC) carrying, the One-to-All Broadcasts such as live Digital Television is professional, transfer to the set-top box in the user family, namely may be output on the television terminal after the demodulation carrying out.

The DVB technology can be shared identical physical network with the coaxial cable broadband access technology, also can adopt different physical networks.A kind of mode commonly used is that DVB technology and coaxial cable broadband access technology can be shared the coaxial cable distribution net between headend and each terminal equipment.

Because on function, existing coaxial cable broadband access system can not substitute cable television system fully, therefore, the present invention is directed to the QoS demand of One-to-All Broadcast business, specialized designs is carried out in data forwarding and Bandwidth sharing mechanism, a kind of coaxial cable broadband access system of supporting broadcast channel is provided, described broadcast channel can satisfy broadcasting service QoS demand, wherein, cable television system is the system that above-mentioned cable TV network forms, and the coaxial cable broadband access system is the system that utilizes the coaxial cable broadband access technology to realize that above-mentioned two-way access network forms.

Below the broadcast singal described in each inventive embodiments can be the signal of above-mentioned One-to-All Broadcast business; Data-signal can be the signal of above-mentioned bi-directional data traffic.The executive agent of Fig. 1, Fig. 2, Fig. 3 a and Fig. 3 b illustrated embodiment is the head end module.

Fig. 1 is the flow chart of data transmission method one embodiment provided by the invention, and as shown in Figure 1, the method comprises:

Step 101, reception service signal.

Wherein, carry signal type in the described service signal, described signal type comprises broadcast singal or data-signal, and the transmission of described broadcast singal is higher than described data-signal to the requirement of service quality QoS.

Signal type under step 102, the described service signal of judgement.Be broadcast singal if judge described service signal, then execution in step 103.

The head end module receives service signal from ONU, after receiving service signal, judges the type of this service signal.Carry signal type in this service signal, signal type can comprise broadcast singal or data-signal.That is to say that this service signal can be broadcast singal, also can be data-signal.

Owing to support the head end module of coaxial cable broadband access technology can not satisfy the QoS demand of One-to-All Broadcast business in the prior art, only be used for receiving and process data signal; And the head end module in the various embodiments of the present invention no longer is subject to the restriction of service signal type, for broadcast singal and data-signal, all can receive and process accordingly.

Broadcast singal can be the signal of the One-to-All Broadcast business such as live Digital Television, and the QoS demand during to signal transmission will be higher than common data-signal.The implementation of the implementation of head end module when broadcast singal is transmitted when data-signal is transmitted is different.Therefore, the type of service signal being judged, is to adopt corresponding transmission means for the signal for the unlike signal type.

When judging service signal and be broadcast singal, can utilize the described operating procedure of step 103, this broadcast singal is transmitted; Owing to support that at present the head end module of coaxial cable broadband access technology is mainly used in transmission of data signals, therefore when judging service signal and be data-signal, can adopt with prior art in similarly implementation this data-signal is transmitted.

Step 103, with described broadcast singal be loaded into for the transmission broadcast singal transfer resource, send to whole terminal modules.

Execution in step 103 is in order to receive described broadcast singal at described transfer resource for the transmission broadcast singal respectively for described whole terminal modules.

The head end module is loaded into broadcast singal on the transfer resource that aims at the transmission broadcast singal and distribute judging after service signal is broadcast singal.

The transfer resource that is used for the transmission broadcast singal is one or more transfer resources that the head end module is divided in order to transmit broadcast singal specially.The difference of the multiplex mode of the coaxial cable broadband access technology that adopts according to the head end module, transfer resource namely correspondingly is the resource in this multiplex mode.For example, the head end module adopts frequency division multiple access (Frequency Division Multiple Access, FDMA) technology, and corresponding transfer resource is different frequency; The head end module adopts time division multiple access (Time Division MultipleAccess, TDMA) technology, and corresponding transfer resource is different time slot.

The head end module can not be used to transmit other service signals again for the transfer resource that the transmission broadcast singal marks off, and therefore, can guarantee to satisfy the demand of the QoS that transmits broadcast singal.

Because the characteristics of broadcast singal are to send to whole terminal modules.Therefore, the head end module not only utilizes special transfer resource to transmit broadcast singal judging after service signal is broadcast singal, also this broadcast singal is sent to all each terminal modules.

The head end module transfer resource is divided into be exclusively used in the transmission broadcast singal or be exclusively used in transmission of data signals after, the transfer resource of dividing is informed each terminal module with the form of notification message.Thereby each terminal module was namely known the type of the signal that transmits on each transfer resource before receiving the service signal that the head end module sends, and then at correspondingly transfer resource receiving broadcast signal or data-signal.

When utilizing cable TV network to come the transfer of unidirectional broadcasting service in the prior art, need to divide certain frequency and bandwidth resources for cable TV network is special, be used for the transfer of unidirectional broadcasting service; And do not need to adopt specially the wired TV network transmission One-to-All Broadcast professional in the embodiment of the invention, in the coaxial cable broadband access network, can finish the transmission of and bi-directional data traffic professional to One-to-All Broadcast, when under the same transmission system, realizing One-to-All Broadcast business and bi-directional data traffic transmission, from under two kinds of different transmission systems, realize respectively professional to One-to-All Broadcast and bi-directional data traffic is transmitted and compared, save certain bandwidth resources, improved the utilance of bandwidth resources.

The data transmission method that the embodiment of the invention provides, after receiving service signal, judge the affiliated signal type of this service signal, be broadcast singal if judge this service signal, then this broadcast singal is loaded into the transfer resource for the transmission broadcast singal, send to whole terminal modules, utilize the coaxial cable broadband access network to realize that the broadcasting transmitting of low delay and jitter is professional with the carrying One-to-All Broadcast, thereby can adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplified network configuration, reduced the complexity of network, improve the utilance of bandwidth resources, be conducive to the technical need of integration of three networks business.

Fig. 2 is the flow chart of another embodiment of data transmission method provided by the invention, as shown in Figure 2, on the basis of above-described embodiment, after the execution of step 102, is data-signal if judge described service signal, then execution in step 104 and step 105.

Step 104, obtain the destination address of carrying in the described data-signal.

Step 105, described data-signal is loaded into transfer resource for transmission of data signals, sends to target terminal module corresponding to described destination address.

Execution in step 105 be for, receive described data-signal for described target terminal module at described transfer resource for transmission of data signals.

The head end module is being judged in the situation that service signal is data-signal, concrete execution mode can for, from this data-signal, obtain one or more destination addresses that its entrained needs send, before this data-signal being sent to respectively target terminal module corresponding to each destination address difference, this data-signal is loaded on the transfer resource that is specifically designed to transmission of data signals.

In the transfer resource that the head end module can be used, beyond the part transfer resource being divided into specially for the transmission broadcast singal, all the other transfer resources are used for transmission of data signals.Because the head end module is when the data service allocation of transmission resources, can according to the size of the data volume of data-signal, be this data signal distribution transfer resource at the transfer resource that is used for transmission of data signals dynamically.

Thereby the utilization of head end module is used for the transfer resource of transmission of data signals, data-signal is sent to target terminal module corresponding to destination address, and then the target terminal module correspondingly can receive this data-signal on the transfer resource.

The data transmission method that the embodiment of the invention provides, judging after service signal is data-signal, obtain the destination address of carrying in this data-signal, and this data-signal is loaded into transfer resource for transmission of data signals, send to target terminal module corresponding to destination address, thereby realize utilizing unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplified network configuration, reduced the complexity of network, improve the utilance of bandwidth resources, be conducive to the technical need of integration of three networks business.

Fig. 3 a is the flow chart of the another embodiment of data transmission method provided by the invention, shown in Fig. 3 a, on the basis of the various embodiments described above, it is after the broadcast singal that execution in step 102 is judged described service signal, execution in step 103 sends to described broadcast singal before whole terminal modules, and the method can also comprise step 106.

Step 106, generate the first transfer resource allocation rule, and described the first transfer resource allocation rule is broadcast to whole terminal modules.

Wherein, described the first transfer resource allocation rule comprises that the transfer resource to being used for the transmission broadcast singal carries out rule for distribution.Execution in step 106 is in order to receive corresponding broadcast singal for each terminal module according to described the first transfer resource allocation rule.

Fig. 3 b is the flow chart of the another embodiment of data transmission method provided by the invention, shown in Fig. 3 b, on the basis of the various embodiments described above, it is after the data-signal that execution in step 102 is judged described service signal, execution in step 105 sends to described data-signal before the described target terminal module, and the method can also comprise step 107.

Step 107, generate the second transfer resource allocation rule, and described the second transfer resource allocation rule is sent to described target terminal module.

Wherein, described the second transfer resource allocation rule is for to carry out rule for distribution according to the data volume of data-signal to be sent to transfer resource.Execution in step 107 is in order to receive corresponding data-signal for described target terminal module according to described the second transfer resource allocation rule.

Because when execution in step 105 and step 107, the destination address of target terminal module obtains by execution in step 104, therefore concrete, the operation of step 107 can be carried out after execution of step 104, and is not shown among Fig. 3 b.

The head end module is after receiving service signal, need to divide transfer resource according to the signal type of service signal, transfer resource is divided into the transfer resource that is specifically designed to the downlink transfer broadcast singal, the transfer resource that is specifically designed to the transfer resource of downlink transmission data signal and is specifically designed to the uplink transmission data signal.Wherein, descending referring to by the transmission direction of head end module to the terminal module transmitted signal, the up transmission direction that refers to terminal module head-end module transmitted signal.

The head end module is when being the transfer resource of data signal distribution of downlink transfer, can distribute according to the size of the data volume of descending data-signal to be sent, consider simultaneously what of available transmission resources, adopt corresponding allocation strategy to distribute, therefore the head end module is receiving service signal and is judging after service signal is data-signal, correspondingly generates the size of the transfer resource that needs distribute according to the size of the data volume of data-signal to be sent.

The head end module not only is downlink transmission data signal allocation of transmission resources, also is used in uplink transmission data signal allocation of transmission resources for terminal module divides.Terminal module head-end module sends before the upstream data. signals, can first head-end module send reservation signal, reservation signal is to send the solicited message that sends before the upstream data. signals in terminal module head-end module, carries the size of its data volume that will send in uplink in reservation signal.The head end module is according to the information of the characterization data amount size of carrying in the reservation signal, and current available transmission resources what are considered, adopting corresponding allocation strategy is the uplink allocation of transmission resources.

To be the first transfer resource allocation rule for the rule definition of broadcast singal allocation of transmission resources, will be the second transfer resource allocation rule for the rule definition of data signal distribution transfer resource.Wherein, be included as in the second transfer resource allocation rule downlink transfer the data signal distribution transfer resource rule and be the rule of the data signal distribution transfer resource of uplink.

Generate the first transfer resource allocation rule according to broadcast singal after, the first transfer resource allocation rule is broadcast to all each terminal modules.Generate the second transfer resource allocation rule according to data-signal after, the second transfer resource allocation rule is sent to the target terminal module.

Thereby, each terminal module can be before the broadcast singal or data-signal that receive the transmission of head end module, know that what transmit on which transfer resource is broadcast singal, what transmit on which transfer resource is data-signal, and which transfer resource can be used for sending upstream data. signals.Each terminal module is after corresponding transfer resource receives broadcast singal or data-signal, can adopt with prior art in similar implementation, according to the difference of signal type, process accordingly operation.

The data transmission method that the embodiment of the invention provides, after receiving service signal, be broadcast singal if judge service signal, then before broadcast singal is sent to each terminal module, to be broadcast to whole terminal modules for the first transfer resource allocation rule of broadcast singal allocation of transmission resources, be data-signal if judge service signal, then before data-signal is sent to the target terminal module, to send to the target terminal module for the second transfer resource allocation rule of downlink transmission data signal and uplink transmission data signal allocation of transmission resources, so that each terminal module receives corresponding broadcast singal or data-signal according to the transfer resource allocation rule, perhaps send corresponding up data-signal according to the transfer resource allocation rule, be conducive to each terminal module in the situation of knowing in advance the signal type that transmits on each transfer resource, receive corresponding broadcasting or data-signal, perhaps send corresponding upstream data. signals, thereby be conducive to adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplify network configuration, reduced the complexity of network.

Further, on the basis of the various embodiments described above, the method can also comprise, periodically according to broadcast singal and/or data-signal to be sent in the upper cycle, generate overall transfer resource allocation rule, and described overall transfer resource allocation rule is broadcast to described whole terminal module; Wherein, described overall transfer resource allocation rule comprises described the first transfer resource allocation rule and described the second transfer resource allocation rule.

The head end module is to carry out after receiving service signal or receiving the reservation signal of transmission of terminal module when the initial allocation transfer resource, after this, can periodically carry out the distribution of transfer resource.The size in this cycle can arrange as required.

Service signal is the descending signal that will send of head end module, reservation signal is that terminal module head-end module before sending upstream data. signals sends, therefore, the head end module is carried out transfer resource and is distributed and to carry out after receiving service signal or reservation signal.

If what the head end module received first is service signal, then the type of service of service signal is judged, if service signal is broadcast singal, then distribute the transfer resource that is exclusively used in the transmission broadcast singal for this broadcast singal, if service signal is data-signal, then according to the data volume of data-signal size and available transmission resources what, be exclusively used in the transfer resource of transmission of data signals for the downlink data signal distribution.After this, the head end module is periodically redistributed transfer resource, in the moment of end cycle, judges in the upper cycle whether packet to be sent is arranged, if having, then according to the type of service of packet to be sent, correspondingly is its allocation of transmission resources.And judge whether to have in the upper cycle from terminal module and receive and untreated reservation signal, if have, then according to the size of the data volume of the up data-signal to be sent that characterizes in the reservation signal and available transmission resources what, be the upstream data. signals allocation of transmission resources.

If what the head end module received first is reservation signal, then according to the size of the data volume of the up data-signal to be sent that characterizes in the reservation signal and available transmission resources what, be the upstream data. signals allocation of transmission resources.After this head end module is periodically redistributed transfer resource, and whether in the moment of end cycle, judging had packet to be sent or receive and untreated reservation signal from terminal module in the upper cycle.

Packet to be sent is for not yet being loaded into the packet on the transfer resource, the packet that has been loaded on the transfer resource namely is sent out after loading is finished, therefore the head end module can be judged the packet that not yet is sent out in the cycle, i.e. packet to be sent.Wherein, packet to be sent may belong to the packet that not yet is sent out in the current business signal, also may belong to the packet that newly receives.

If packet to be sent or untreated reservation signal are arranged, then the head end module re-starts distribution up and/or the downlink transfer resource according to packet to be sent or untreated reservation signal.For the packet of the broadcast singal in the packet to be sent, distribute the transfer resource that is exclusively used in the transmission broadcast singal, corresponding to the first transfer resource allocation rule in above-described embodiment; Packet for wherein data-signal, according to what of the size of the data volume of downlink data signal and available transmission resources, the downlink transfer resource of distributing corresponding size, for untreated reservation signal, according to what of the size of the data volume of upstream data. signals waiting for transmission and available transmission resources, the uplink transmission resource of distributing corresponding size, the allocation rule of downlink transfer resource and uplink transmission resource is corresponding to the second transfer resource allocation rule in above-described embodiment.

If without packet to be sent, then the head end module does not need to re-start the distribution of downlink transfer resource.If without untreated reservation signal, then the head end module does not need to re-start the distribution of uplink transmission resource.

Because transfer resource has globality, the first transfer resource allocation rule and the unification of the second transfer resource allocation rule can be overall transfer resource allocation rule, and overall transfer resource allocation rule is broadcast to whole terminal modules.And then each terminal module receives service signal or head-end module transmission upstream data. signals according to the up-to-date overall transfer resource allocation rule that receives at corresponding transfer resource.

The data transmission method that the embodiment of the invention provides, periodically overall transfer resource allocation rule is upgraded, be convenient to each terminal module and receive corresponding broadcast singal or data-signal according to the transfer resource allocation rule, perhaps the head-end module sends upstream data. signals, be conducive to each terminal module in the situation of knowing in advance the signal type that transmits on each transfer resource, receive corresponding broadcasting or data-signal, perhaps send upstream data. signals, thereby be conducive to adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplify network configuration, reduced the complexity of network.

Further, on the basis of the various embodiments described above, in the step 103, described broadcast singal is loaded into for being specially on the transfer resource that transmits broadcast singal:

The destination address of described broadcast singal is set to broadcast address, and described broadcast address is used to indicate described whole terminal modules as the target terminal module; The broadcast singal that is provided with described broadcast address is loaded into for the transfer resource that transmits broadcast singal.

The head end module is being judged after service signal is broadcast singal, on this broadcast singal being loaded into for the transfer resource of transmission broadcast singal before, can also the form of the Frame of this broadcast singal be encapsulated.Concrete, the destination address of the Frame of this broadcast singal is set to broadcast address, the special identification information that broadcast address can define in communication protocol, the head end module is when sending broadcast singal, according to the special identification information in the destination address, can know that this broadcast message need to send to whole terminal modules.That is to say that the effect of broadcast address is in order to show that whole terminal modules is the target terminal module.

The head end module is loaded into the broadcast singal that is provided with broadcast address for the transfer resource that transmits broadcast singal after the destination address of broadcast singal having been carried out setting.

The data transmission method that the embodiment of the invention provides, broadcast singal is loaded into for the transmission broadcast singal transfer resource send before, destination address to this broadcast singal arranges, destination address is set to after the broadcast address, can show that this broadcast singal need to send to whole terminal modules, be conducive to utilize coaxial cable broadband access network carrying One-to-All Broadcast professional, thereby be conducive to adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplify network configuration, reduced the complexity of network.

Further, on the basis of the various embodiments described above, described transfer resource is time slot;

Correspondingly, described transfer resource for the transmission broadcast singal is the time slot for the transmission broadcast singal, described transfer resource for transmission of data signals is the time slot for transmission of data signals, and the slot time between the length of described time slot for transmitting broadcast singal and the described time slot for transmitting broadcast singal can preset.

A kind ofly preferred embodiment be, the TDMA technology is adopted in communicating by letter between head end module and the terminal module, and transfer resource is one or more time slots.Correspondingly, the transfer resource that is used for the transmission broadcast singal is exactly the time slot that the head end module marks off for the transmission broadcast singal in advance, and the transfer resource that is used for transmission of data signals is exactly the time slot that the head end module marks off for transmission of data signals in advance.

Wherein, the demand of QoS when in order to satisfy broadcast singal being transmitted, the time slot that is used for the transmission broadcast singal is set to be fixed for transmitting broadcast singal, the length that is used for the time slot of transmission broadcast singal can be set up in advance as required, in addition, in order to guarantee that terminal module receives after the broadcast message continuity when presenting to the user, also very important for the slot time between the time slot of transmission broadcast singal, also can be set up as required in advance.

Because the head end module can be according to the size of the data volume of data-signal, what of the time slot that determine to need uses, therefore, the time slot that is used for transmission of data signals can be used according to the actual needs by the head end module, and does not need to be fixedly installed slot length and slot time.In all available time slots of headend, except dividing the time slot that is used for the transmission broadcast singal out, all the other time slots all can be used for transmission of data signals.

In addition, headend can change the division to time slot, after having upgraded the transfer resource allocation rule, the transfer resource allocation rule after upgrading is broadcast to each terminal module gets final product.Thereby each terminal module can receive corresponding broadcast singal or data-signal according to the transfer resource allocation rule of upgrading.

The data transmission method that the embodiment of the invention provides, adopt time slot as transfer resource, to be used for for the time slot conduct of transmission broadcast singal the transfer resource of transmission broadcast singal, to be used for for the time slot conduct of transmission of data signals the transfer resource of transmission of data signals, and can be preseted for the length of the time slot that is used for the transmission broadcast singal and for the slot time between the time slot of transmission broadcast singal, be conducive to guarantee the transmission quality to broadcast singal, thereby utilize the coaxial cable broadband access network to realize that the broadcasting transmitting of low delay and jitter is professional with the carrying One-to-All Broadcast, adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplify network configuration, reduced the complexity of network.

Fig. 4 extremely executive agent embodiment illustrated in fig. 5 is terminal module.

Fig. 4 is the flow chart of the another embodiment of data transmission method provided by the invention, and as shown in Figure 4, the method comprises:

Step 201, reception head end module perhaps receive the data-signal that described head end module sends at the transfer resource that is used for transmission of data signals at the broadcast singal that the transfer resource that is used for the transmission broadcast singal sends.

Wherein, to be described head end module judging after service signal is broadcast singal described broadcast singal, is loaded into described on the transfer resource of transmission broadcast singal; To be described head end module judging after service signal is data-signal described data-signal, is loaded into described on the transfer resource of transmission of data signals.

Carry out the method for transfer of data in the embodiment of the invention between terminal module and the head end module, can referring to the implementation among above-mentioned steps 101-105 and relevant each embodiment, repeat no more herein.

The data transmission method that the embodiment of the invention provides, can receive the head end module is judging after service signal is broadcast singal, be loaded into for the broadcast singal that sends on the transfer resource of transmission broadcast singal or receive the head end module and judging after service signal is data-signal, be loaded into the data-signal that sends on the transfer resource for transmission of data signals, thereby realized utilizing coaxial cable broadband access network carrying One-to-All Broadcast professional, adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplified network configuration, reduced the complexity of network, improve the utilance of bandwidth resources, be conducive to the technical need of integration of three networks business.

Fig. 5 is the flow chart of the another embodiment of data transmission method provided by the invention, and as shown in Figure 5, before execution in step 201, the method can also comprise:

The first transfer resource allocation rule or the second transfer resource allocation rule that step 200, the described head end module of reception send.

Wherein, described the first transfer resource allocation rule comprises described head end module to carrying out rule for distribution for the transfer resource that transmits broadcast singal, and described the second transfer resource allocation rule is that described head end module is carried out rule for distribution according to the data volume of data-signal to be sent to transfer resource.

Perhaps, receive the overall transfer resource allocation rule of described head end module broadcasting, described overall transfer resource allocation rule comprises described the first transfer resource allocation rule and described the second transfer resource allocation rule.

Carry out the method for transfer of data in the embodiment of the invention between terminal module and the head end module, can referring to the implementation among above-mentioned steps 101-107 and relevant each embodiment, repeat no more herein.

The data transmission method that the embodiment of the invention provides, before the broadcast singal or data-signal that receive the transmission of head end module, receive the transfer resource allocation rule that the head end module sends, thereby according to the rule of in the transfer resource allocation rule transfer resource that is used for transmitting the transfer resource of broadcast singal and be used for transmission of data signals being divided, receiving broadcast signal or data-signal on corresponding transfer resource, thereby each terminal module is in the situation of knowing in advance the signal type that transmits on each transfer resource, receive corresponding broadcasting or data-signal, be conducive to adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplify network configuration, reduced the complexity of network.

Fig. 6 is the structural representation of head end module one embodiment provided by the invention, and as shown in Figure 6, this head end module comprises receiving element 11, judging unit 12 and processing unit 13.

Wherein, receiving element 11 is used for receiving service signal, carries signal type in the described service signal, and described signal type comprises broadcast singal or data-signal, and the transmission of described broadcast singal is higher than described data-signal to the requirement of service quality QoS;

Judging unit 12 is used for the signal type of judging that described service signal is affiliated;

Processing unit 13, be used for when judging described service signal and be broadcast singal, described broadcast singal is loaded into for the transfer resource that transmits broadcast singal, send to whole terminal modules, receive described broadcast singal at described transfer resource for the transmission broadcast singal respectively for described whole terminal modules.

The head end module that the embodiment of the invention provides, after receiving service signal, judge the affiliated signal type of this service signal, be broadcast singal if judge this service signal, then this broadcast singal is loaded into the transfer resource for the transmission broadcast singal, send to whole terminal modules, utilize the coaxial cable broadband access network to realize that the broadcasting transmitting of low delay and jitter is professional with the carrying One-to-All Broadcast, thereby can adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplified network configuration, reduced the complexity of network, improve the utilance of bandwidth resources, be conducive to the technical need of integration of three networks business.

Further, on the basis of above-described embodiment, described processing unit 13 also is used for:

When judging described service signal and be data-signal, obtain the destination address of carrying in the described data-signal, and described data-signal is loaded into transfer resource for transmission of data signals, send to target terminal module corresponding to described destination address, receive described data-signal for described target terminal module at described transfer resource for transmission of data signals.

The head end module that the embodiment of the invention provides, judging after service signal is data-signal, obtain the destination address of carrying in this data-signal, and this data-signal is loaded into transfer resource for transmission of data signals, send to target terminal module corresponding to destination address, thereby realize utilizing unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplified network configuration, reduced the complexity of network, improved the utilance of bandwidth resources, the technical need that is conducive to integration of three networks business.

Fig. 7 is the structural representation of another embodiment of head end module provided by the invention, and as shown in Figure 7, on the basis of above-described embodiment, described head end module also comprises:

Scheduling unit 14, be used for judging after described service signal is broadcast singal at described judging unit 12, described processing unit 13 sends to described broadcast singal before whole terminal modules, generate the first transfer resource allocation rule, and described the first transfer resource allocation rule is broadcast to described whole terminal module, described the first transfer resource allocation rule comprises that the transfer resource to being used for the transmission broadcast singal carries out rule for distribution, receives corresponding broadcast singal for each terminal module according to described the first transfer resource allocation rule;

Perhaps, be used for judging after described service signal is data-signal at described judging unit 12, described processing unit 13 sends to described data-signal before the described target terminal module, generate the second transfer resource allocation rule, and described the second transfer resource allocation rule sent to described target terminal module, described the second transfer resource allocation rule receives corresponding data-signal for described target terminal module according to described the second transfer resource allocation rule for according to the data volume of module data-signal to be sent transfer resource is carried out rule for distribution.

Further, on the basis of the various embodiments described above, described scheduling unit 14 can also be used for:

Periodically according to broadcast singal and/or data-signal to be sent in the upper cycle, generated overall transfer resource allocation rule, and described overall transfer resource allocation rule is broadcast to described whole terminal module;

Wherein, described overall transfer resource allocation rule comprises described the first transfer resource allocation rule and described the second transfer resource allocation rule.

The head end module not only for terminal module divides the transfer resource that is used in downlink transfer, also is used in the transfer resource that terminal module carries out uplink for terminal module divides when being the terminal module allocation of transmission resources.

Terminal module is after the transfer resource allocation rule that receives the transmission of head end module, broadcast singal or data-signal that the head end module sends both can have been received, also can the head-end module send corresponding data-signal, perhaps the head-end module is returned corresponding signaling information.Corresponding module can be set in the head end module be used for the information that the receiving terminal module sends.

Concrete, the signalling interactive process of terminal module head-end module inverse signal or the processing procedure that sends data-signal can adopt with prior art in similar implementation, repeat no more herein.

Further, on the basis of the various embodiments described above, described processing unit 13 also is used for:

The destination address of described broadcast singal is set to broadcast address, described broadcast address is used to indicate described whole terminal modules as the target terminal module, and the broadcast singal that will be provided with described broadcast address is loaded into the transfer resource for the transmission broadcast singal.

The head end module that the embodiment of the invention provides, broadcast singal is loaded into for the transmission broadcast singal transfer resource send before, destination address to this broadcast singal arranges, destination address is set to after the broadcast address, can show that this broadcast singal need to send to whole terminal modules, be conducive to utilize coaxial cable broadband access network carrying One-to-All Broadcast professional, thereby be conducive to adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplify network configuration, reduced the complexity of network.

The head end module that the embodiment of the invention provides, adopt time slot as transfer resource, to be used for for the time slot conduct of transmission broadcast singal the transfer resource of transmission broadcast singal, to be used for for the time slot conduct of transmission of data signals the transfer resource of transmission of data signals, and can be preseted for the length of the time slot that is used for the transmission broadcast singal and for the slot time between the time slot of transmission broadcast singal, be conducive to guarantee the transmission quality to broadcast singal, thereby utilize the coaxial cable broadband access network to realize that the broadcasting transmitting of low delay and jitter is professional with the carrying One-to-All Broadcast, adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplify network configuration, reduced the complexity of network.

Concrete, the head end module is carried out the method for transfer of data in the various embodiments of the present invention, can referring to the operating procedure described in the embodiment of the method for above-mentioned correspondence, repeat no more herein.

Fig. 8 is the structural representation of terminal module one embodiment provided by the invention, and as shown in Figure 8, this terminal module comprises:

Receiving element 21, be used for receiving the broadcast singal that the head end module sends at the transfer resource that is used for the transmission broadcast singal, to be described head end module judging after service signal is broadcast singal described broadcast singal, is loaded into described on the transfer resource of transmission broadcast singal; Perhaps

Wherein, terminal module is after the transfer resource allocation rule that receives the transmission of head end module, both can receive broadcast singal or data-signal that the head end module sends, and also can the head-end module send corresponding data-signal, perhaps the head-end module is returned corresponding signaling information.Corresponding module can be set in the head end module be used for the information that the receiving terminal module sends.

The terminal module that the embodiment of the invention provides, can receive the head end module is judging after service signal is broadcast singal, be loaded into for the broadcast singal that sends on the transfer resource of transmission broadcast singal or receive the head end module and judging after service signal is data-signal, be loaded into the data-signal that sends on the transfer resource for transmission of data signals, thereby realized utilizing coaxial cable broadband access network carrying One-to-All Broadcast professional, adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplified network configuration, reduced the complexity of network, improve the utilance of bandwidth resources, be conducive to the technical need of integration of three networks business.

Fig. 9 is the structural representation of another embodiment of terminal module provided by the invention, and as shown in Figure 9, described terminal module can also comprise:

Control unit 22, be used for receiving the broadcast singal that described head end module sends at the transfer resource that is used for the transmission broadcast singal at described receiving element 21, perhaps received described head end module before the data-signal that the transfer resource that is used for transmission of data signals sends, receive the first transfer resource allocation rule or the second transfer resource allocation rule that described head end module sends, described the first transfer resource allocation rule comprises described head end module to carrying out rule for distribution for the transfer resource that transmits broadcast singal, and described the second transfer resource allocation rule is for to carry out rule for distribution according to the data volume of data-signal to be sent to transfer resource;

Perhaps receive the overall transfer resource allocation rule of described head end module broadcasting, described overall transfer resource allocation rule comprises described the first transfer resource allocation rule and described the second transfer resource allocation rule.

The head end module not only for terminal module divides the transfer resource that is used in downlink transfer, also divides to be used in the transfer resource that terminal module carries out uplink when being the terminal module allocation of transmission resources.Thereby terminal module can be the transfer resource that is used for uplink of its distribution according to the head end module, head-end equipment sending data signal or return signaling information.

The terminal module that the embodiment of the invention provides, before the broadcast singal or data-signal that receive the transmission of head end module, receive the transfer resource allocation rule that the head end module sends, thereby according to the rule of in the transfer resource allocation rule transfer resource that is used for transmitting the transfer resource of broadcast singal and be used for transmission of data signals being divided, receiving broadcast signal or data-signal on corresponding transfer resource, thereby each terminal module is in the situation of knowing in advance the signal type that transmits on each transfer resource, receive corresponding broadcasting or data-signal, be conducive to adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplify network configuration, reduced the complexity of network.

The terminal module that the embodiment of the invention provides, adopt time slot as transfer resource, to be used for for the time slot conduct of transmission broadcast singal the transfer resource of transmission broadcast singal, to be used for for the time slot conduct of transmission of data signals the transfer resource of transmission of data signals, and can be preseted for the length of the time slot that is used for the transmission broadcast singal and for the slot time between the time slot of transmission broadcast singal, be conducive to guarantee the transmission quality to broadcast singal, thereby utilize the coaxial cable broadband access network to realize that the broadcasting transmitting of low delay and jitter is professional with the carrying One-to-All Broadcast, adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, simplify network configuration, reduced the complexity of network.

Concrete, terminal module carries out the method for transfer of data in the various embodiments of the present invention, can referring to the operating procedure described in the embodiment of the method for above-mentioned correspondence, repeat no more herein.

Figure 10 is the structural representation of headend embodiment provided by the invention, and as shown in figure 10, this headend 3 comprises arbitrary described head end module 1 in the various embodiments described above.

Wherein head end module 1 can be arranged in the independent headend 3, also can be arranged in the ONU equipment.That is to say that headend 3 can or be ONU equipment for independent device or equipment.

Concrete, headend carries out the method for transfer of data in the various embodiments of the present invention, can referring to the operating procedure described in the embodiment of the method for above-mentioned correspondence, repeat no more herein.

Figure 11 is the structural representation of terminal equipment embodiment provided by the invention, and as shown in figure 11, this terminal equipment 4 comprises arbitrary described terminal module 2 in the various embodiments described above.

Wherein terminal module 2 can be arranged in the independent terminal equipment 4, also can be arranged in the set-top box.That is to say that terminal equipment 4 can or be set-top box for independent device or equipment.

Concrete, terminal equipment carries out the method for transfer of data in the various embodiments of the present invention, can referring to the operating procedure described in the embodiment of the method for above-mentioned correspondence, repeat no more herein.

Figure 12 a is the system construction drawing of communication system provided by the invention, and Figure 12 b is the schematic diagram of the logical channel of communication system provided by the invention.It below is a kind of optional execution mode of communication system.

This communication system has been carried out the expansion upgrading to existing coaxial cable broadband access system, to support the transmission of and bi-directional data traffic professional to One-to-All Broadcast.Shown in Figure 12 a, this communication system comprises headend 3 and one or more terminal equipment 4.Connect by coaxial cable distribution net between headend 3 and the terminal equipment 4.

Headend 3 is used for receiving the Ethernet data bag, after the packet that receives is carried out necessary processing, is packaged into the respective inner protocol format, and is transmitted to terminal equipment 4.Realize data interaction by inner communication protocol between headend 3 and the terminal equipment 4.

Terminal equipment 4 is realized the conversion of intra-network communication agreement and Ethernet protocol and radio and television agreement as the end equipment of communication system, and the interface that carries out broadband access is provided for subscriber equipment.

One title end equipment 3 can be connected with many station terminals equipment 4, and whole communication system is point-to-multipoint star-like logical topological structure.Headend 3 is realized unified management and scheduling to all terminal equipments 4 as the center control nodes of this communication system.

Headend 3 to the data transfer direction of terminal equipment 4 is descending; Terminal equipment 4 to the data transfer direction of headend 3 is up.This communication system can adopt multi-carrier modulation, can adopt time division duplex (Time Division Duplexing, TDD) or Frequency Division Duplexing (FDD) (Frequency DivisionDuplexing, FDD) mode, adopts time division multiple access TDMA technology.

Shown in Figure 12 b, two data passages are logically arranged between headend 3 and the terminal equipment 4, be respectively broadcast channel and exchange channels.

Wherein, broadcast channel is unidirectional downlink broadcast data channel, as the designated lane of the One-to-All Broadcast business such as carrying live television service; Exchange channels is bidirectional unicast/multicast packet passage, as the designated lane of carrying bi-directional data traffic.Broadcast channel can adopt identical technical system with exchange channels.Broadcast channel and exchange channels are the divisions of logically communication link being carried out, both realize in the same physical connection in fact, therefore, broadcast channel and exchange channels are in fact common transmitter and receiver, and adopt identical physical layer parameter and signal processor system.

Exchange channels is used for the business not too high to delay requirement such as carrying bi-directional data traffic.Employing provides the service of doing one's best based on reservation/license or demand assigned resource allocation mechanism of equal value, satisfies the business need of different priorities.Broadcast channel is used for the business higher to delay requirement such as One-to-All Broadcast business such as carrying live telecast, adopts broadcast mode to realize unidirectional downlink communication.Broadcast channel has the advantage identical with cable television system, i.e. propagation delay time shake is little, without congested.

Broadcast channel and exchange channels are with the parameter of time as division signals, respectively by different time period signal transmissions.Broadcast channel is carried out channel allocation, to guarantee logically can to monopolize a communication port to the transmission of One-to-All Broadcast business, from the time domain angle, can adopt the mode of allocating time slot in advance, also can be One-to-All Broadcast business setting high priority, employing is preferably its mode of distributing time slot, perhaps can also adopt other similar implementations.

Broadcast channel is the logical channel of setting up at medium access control layer.The functions such as specifically, the medium access control layer of coaxial cable broadband access system realization medium access control, channel allocation and business are adaptive.In order to realize the support to broadcast channel, need to be to the expansion of upgrading of channel allocation and professional adaption section, so that descending One-to-All Broadcast is professional and the two-way interactive data service is being transmitted into terminal equipment 4 by physical layer modulation and radio frequency unit on the channel time slot respectively accordingly.

To the upgrading expansion that professional adaption section is carried out, mainly be aspect Frame carrying and address mapping.Data frame format is defined as for the Frame that carries the One-to-All Broadcast business, the field of the sign destination address of this Frame is set to broadcast address, the field that characterizes the bearer service type is set to broadcast television service, at the carry-on frame length of the payload segment of Frame, can be according to channel situation and traffic carrying capacity and correspondingly arrange.

Divide the upgrading of carrying out expansion to channel allocation unit, be mainly bandwidth resources are divided into two parts, it is professional that a part is used for the carrying One-to-All Broadcast, and another part is used for the clean culture bi-directional data traffic such as carrying data, voice, video.

A kind of preferred implementation is, when the bandwidth resources that adopt are time slot, the time span of send window that is used for each time slot of carrying One-to-All Broadcast business equates, send window evenly distributes on time shaft, this time span can be set up in advance, it is also conceivable that when arranging the One-to-All Broadcast business is to the demand of bandwidth; Be used for the time slot of carrying bi-directional data traffic, can be distributed according to certain strategy according to the bandwidth request of terminal equipment 4 by headend 3, the bandwidth resources that each terminal equipment 4 is got how much be variable.

The specific implementation of channel allocation can for, when adopting TDD duplex mode, TDMA multi-access mode, headend 3 arranges the channel assignment scheme in each cycle, and by corresponding control frame channel assignment scheme is broadcast to each terminal equipment 4.Each cycle is divided into different time slots, comprises uplink time slot, downlink transfer time slot and time slot.The length in each cycle is basic fixing, and the time slot length in each cycle also can be fixed, and it is relatively-stationary being engraved in the position of planning horizon during the start-stop of time slot.The uplink and downlink transmission time slot can according to actual needs, be distributed to each terminal equipment 4 according to certain strategy.When adopting FDD duplex mode, TDMA multi-access mode, adopt frequency division multiplexing between uplink time slot and the downlink transfer time slot, adopt time division multiplexing between downlink transfer time slot and the time slot.Headend 3 arranges to be finished after the multiplex mode of downlink data channel in broadcast channel and the exchange channels, informs each terminal equipment 4.When no matter utilizing which kind of duplex mode, the length of time slot all is to be configured directly or indirectly by network management system, and wherein network management system can be preset in the long-range Network Management Equipment, also can be arranged in the headend 3.

The communication system that the embodiment of the invention provides, adopt the coaxial cable broadband access technology to realize the fusion of cable TV network and bidirectional data network, existing coaxial cable access technology is improved upgrading, for the professional specialized designs of One-to-All Broadcast broadcast channel, have low the delay, the transmission characteristic of low jitter, and can be according to the business demand configured bandwidth, to satisfy the qos requirement of broadcast television service, thereby can adopt unified technical scheme and the network architecture to carry simultaneously One-to-All Broadcast business and bi-directional data traffic, cable TV network and bidirectional data network are united two into one, be conducive to satisfy the technical need of integration of three networks business, simplified further network configuration, realized the flexible dispatching of network bandwidth resources and rationally utilization; Broadcast channel and exchange channels all adopt the physical layer signal treatment mechanism of existing coaxial cable access technology, adopt the signal processing technology of multicarrier, have improved the utilance to channel width, also can carry out Design of Compatibility with existing terminal.

One of ordinary skill in the art will appreciate that: all or part of step that realizes above-mentioned each embodiment of the method can be finished by the relevant hardware of program command.Aforesaid program can be stored in the computer read/write memory medium.This program is carried out the step that comprises above-mentioned each embodiment of the method when carrying out; And aforesaid storage medium comprises: the various media that can be program code stored such as ROM, RAM, magnetic disc or CD.

It should be noted that at last: above each embodiment is not intended to limit only in order to technical scheme of the present invention to be described; Although with reference to aforementioned each embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps some or all of technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the scope of various embodiments of the present invention technical scheme.

Claims

1. a data transmission method is characterized in that, comprising:

Judge the signal type that described service signal is affiliated;

2. data transmission method according to claim 1 is characterized in that, after the signal type under the described service signal of described judgement, described method also comprises:

Be data-signal if judge described service signal, then obtain the destination address of carrying in the described data-signal;

Described data-signal is loaded into transfer resource for transmission of data signals, sends to target terminal module corresponding to described destination address, receive described data-signal for described target terminal module at described transfer resource for transmission of data signals.

3. data transmission method according to claim 2 is characterized in that, described to judge described service signal be after the broadcast singal, and described broadcast singal is sent to before whole terminal modules, and described method also comprises:

Generate the first transfer resource allocation rule, and described the first transfer resource allocation rule is broadcast to described whole terminal module, described the first transfer resource allocation rule comprises that the transfer resource to being used for the transmission broadcast singal carries out rule for distribution, receives corresponding broadcast singal for each terminal module according to described the first transfer resource allocation rule;

Perhaps, described to judge described service signal be after the data-signal, and described data-signal is sent to before the described target terminal module, and described method also comprises:

Generate the second transfer resource allocation rule, and described the second transfer resource allocation rule sent to described target terminal module, described the second transfer resource allocation rule receives corresponding data-signal for described target terminal module according to described the second transfer resource allocation rule for according to the data volume of data-signal to be sent transfer resource is carried out rule for distribution.

4. data transmission method according to claim 3 is characterized in that, described method also comprises:

5. data transmission method according to claim 1 is characterized in that, described with described broadcast singal be loaded into for the transmission broadcast singal transfer resource on be specially:

The destination address of described broadcast singal is set to broadcast address, and described broadcast address is used to indicate described whole terminal modules as the target terminal module;

The broadcast singal that is provided with described broadcast address is loaded into for the transfer resource that transmits broadcast singal.

6. arbitrary described data transmission method is characterized in that according to claim 1-5, and described transfer resource is time slot;

7. a data transmission method is characterized in that, comprising:

8. data transmission method according to claim 7, it is characterized in that, the broadcast singal that described reception head end module sends at the transfer resource that is used for the transmission broadcast singal, perhaps the described head end module of described reception is before the data-signal that the transfer resource that is used for transmission of data signals sends, and described method also comprises:

Receive the first transfer resource allocation rule or the second transfer resource allocation rule that described head end module sends, described the first transfer resource allocation rule comprises described head end module to carrying out rule for distribution for the transfer resource that transmits broadcast singal, and described the second transfer resource allocation rule is that described head end module is carried out rule for distribution according to the data volume of data-signal to be sent to transfer resource;

9. according to claim 7 or 8 described data transmission methods, it is characterized in that described transfer resource is time slot;

10. a head end module is characterized in that, comprising:

11. head end module according to claim 10 is characterized in that, described processing unit also is used for:

12. head end module according to claim 11 is characterized in that, described head end module also comprises:

Scheduling unit, be used for going out after described service signal is broadcast singal in described judgment unit judges, described processing unit sends to described broadcast singal before whole terminal modules, generate the first transfer resource allocation rule, and described the first transfer resource allocation rule is broadcast to described whole terminal module, described the first transfer resource allocation rule comprises that the transfer resource to being used for the transmission broadcast singal carries out rule for distribution, receives corresponding broadcast singal for each terminal module according to described the first transfer resource allocation rule;

Perhaps, be used for going out after described service signal is data-signal in described judgment unit judges, described processing unit sends to described data-signal before the described target terminal module, generate the second transfer resource allocation rule, and described the second transfer resource allocation rule sent to described target terminal module, described the second transfer resource allocation rule receives corresponding data-signal for described target terminal module according to described the second transfer resource allocation rule for according to the data volume of data-signal to be sent transfer resource is carried out rule for distribution.

13. head end module according to claim 12 is characterized in that, described scheduling unit also is used for:

14. head end module according to claim 10 is characterized in that, described processing unit also is used for:

15. arbitrary described head end module is characterized in that according to claim 10-14, described transfer resource is time slot;

16. a terminal module is characterized in that, comprising:

17. terminal module according to claim 16 is characterized in that, described terminal module also comprises:

Control unit, be used for receiving the broadcast singal that described head end module sends at the transfer resource that is used for the transmission broadcast singal at described receiving element, perhaps received described head end module before the data-signal that the transfer resource that is used for transmission of data signals sends, receive the first transfer resource allocation rule or the second transfer resource allocation rule that described head end module sends, described the first transfer resource allocation rule comprises described head end module to carrying out rule for distribution for the transfer resource that transmits broadcast singal, and described the second transfer resource allocation rule is for to carry out rule for distribution according to the data volume of data-signal to be sent to transfer resource;

18. according to claim 16 or 17 described terminal modules, it is characterized in that described transfer resource is time slot;

19. a headend is characterized in that, comprises such as arbitrary described head end module among the claim 10-15.

20. a terminal equipment is characterized in that, comprises such as arbitrary described terminal module among the claim 16-18.

21. a communication system is characterized in that, comprises headend as claimed in claim 19 and one or more terminal equipment as claimed in claim 20.