CN103581060B - A kind of sub-carrier wave distribution method, equipment and system - Google Patents

Abstract

The embodiment of the invention discloses a kind of sub-carrier wave distribution method, equipment and system.The present invention relates to the communications field, be applied to EPOC system, according to data traffic or the data rate of dynamic prediction, and the SNR information sub-carrier of subcarrier carries out the most dynamically distribution, and then improves utilization rate and the QoS of subcarrier.The method that the embodiment of the present invention provides includes: the data stream obtaining the OLT each CNU transmission at least one CNU will arrive Mean Speed or the data volume of CMC in next cycle；Each CNU described that each CNU described in receiving sends signal to noise ratio snr information on each subcarrier；Mean Speed or the data volume of described CMC will be arrived according to described data stream in next cycle, and each CNU described signal to noise ratio snr information on each subcarrier will be respectively the data flow point sub-carriers that described OLT sends to each CNU described.

Description

A kind of sub-carrier wave distribution method, equipment and system

Technical field

The present invention relates to the communications field, particularly relate to a kind of sub-carrier wave distribution method, equipment and system.

Background technology

EPON (PassiveOpticalNetwork, it is called for short PON), especially Ethernet passive optical network (EthernetPassiveOpticalNetwork is called for short EPON) has been considered to be suitable for the access network technology that coming generation of user accesses.In general, EPON can be divided into that Fiber To The Curb (FibertotheCurb, be called for short FTTC), Fiber To The Building (FibertotheBuilding, be called for short FTTB) and three kinds of networking modes of fiber-to-the-subscriber (FibertotheHome is called for short FTTH).Owing to FTTH lower deployment cost is higher, therefore it is typically chosen the networking mode of FTTC or FTTB.But, optical node (roadside or building) from user more close to service quality (QualityofService, be called for short QoS) the best.Therefore, in order to seek bandwidth more higher than FTTC and FTTB and handling capacity and the moderate access technology of lower deployment cost, it is typically chosen mixing access technology (HybridFiber-Coax is called for short HFC).

Based on coaxial Ethernet passive optical network (EthernetPassiveOpticalNetworkOverCoaxial, it being called for short EPOC) system is a kind of to have merged light and coaxial HFC, generally comprise area of light part and coax network two parts, wherein, area of light part for connecting Internet protocol (InternetProtocol by EPOC, it is called for short IP), Synchronous Optical Network (SynchronousOpticalNetwork, it is called for short SONET) or asynchronous transfer mode (AsynchronousTransferMode, be called for short ATM) etc. backbone network, coax network is used for connecting each user.EPOC is mainly by optical line terminal (OpticalLineTerminal, be called for short OLT), coaxial medium converter (CoaxialMediaConverter, it is called for short CMC) and coaxial network unit (CoaxialNetworkUnit is called for short CNU) three parts composition.Wherein, OLT is connected with CMC by optical fiber, and CMC is connected with CNU by coaxial cable.CMC is for the signal conversion between area of light and coax network.

In the transmitting procedure of existing EPOC system, inventor finds that at least there are the following problems: due to transmission stream (TransportStream, it is called for short TS) belong to dynamic bit rate (VariableBitRate, it is called for short VBR) business, the TS stream distribution fixed-bandwidth of transmission is given according to fixed rate, the problem such as the waste of bandwidth resources or service quality (QualityofService is called for short QoS) difference can be caused.Such as: if limited bandwidth resources can be wasted in a large number by peak rate distribution bandwidth；If by average rate-allocation, serious packet loss rate and time delay can be caused.

Summary of the invention

The embodiment of the present invention provides a kind of sub-carrier wave distribution method, equipment and system, carries out the most dynamically distribution according to the data traffic of dynamic prediction or the SNR information sub-carrier of data rate and subcarrier, and then improves utilization rate and the QoS of subcarrier.

For reaching above-mentioned purpose, the embodiment of the present invention employed technical scheme comprise that,

First aspect, provide a kind of sub-carrier wave distribution method, it is applied to based on coaxial Ethernet passive optical network EPOC system, described EPOC system includes optical line terminal OLT, coaxial medium transducer CMC and at least one coaxial network unit CNU, described OLT is connected by optical fiber with described CMC, and described CMC is connected by coaxial cable with at least one CNU described, it is characterized in that, the method includes:

The data stream obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period；

Each CNU described that each CNU described in receiving sends signal to noise ratio snr information on each subcarrier；

Mean Speed or the data volume of described CMC will be arrived according to described data stream in the next cycle of current period, and each CNU described signal to noise ratio snr information on each subcarrier will be respectively the data flow point sub-carriers that described OLT sends to each CNU described.

In the implementation that the first is possible, according to first aspect, the data stream obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period, be implemented as:

Remaining data amount or the bandwidth of excess distribution of caching in described CMC is recorded within each cycle；

Mean Speed or the data volume of described CMC will be arrived in next cycle according to current period described in the remaining data amount of caching in the described CMC in each cycle described or the bandwidth calculation of excess distribution.

In the implementation that the second is possible, in conjunction with first aspect or implementation that the first is possible, the method also includes:

The data stream sent by the described OLT received each CNU at least one CNU described is divided into transmission flow data and other data in addition to described transmission flow data according to type of service；Accordingly,

The data stream obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period, be implemented as: the transmission flow data obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period；

Mean Speed or the data volume of described CMC will be arrived in the next cycle of current period according to described data stream, it is respectively the data flow point sub-carriers that described OLT sends to each CNU described with each CNU described signal to noise ratio snr information on each subcarrier, it is implemented as: Mean Speed or the data volume of described CMC will be arrived in the next cycle of current period according to described transmission flow data, and each CNU described SNR information on each subcarrier is respectively each described transmission flow data distribution subcarrier.

In the implementation that the third is possible, in conjunction with the implementation that the second is possible, Mean Speed or the data volume of described CMC will be arrived in the next cycle of current period according to described transmission flow data, it is respectively each described transmission flow data distribution subcarrier with each CNU described SNR information on each subcarrier, is implemented as:

The Mean Speed of described CMC will be arrived in the next cycle of current period according to transmission flow data each described or data volume will calculate the waiting time of each transmission first bag of flow data of caching in described CMC；

Waiting time and each CNU described signal to noise ratio snr information on each subcarrier according to each transmission first bag of flow data described are respectively each transmission flow data distribution subcarrier.

In the 4th kind of possible implementation, in conjunction with the implementation that the third is possible, waiting time and each CNU described signal to noise ratio snr information on each subcarrier according to each transmission first bag of flow data described are respectively each transmission flow data distribution subcarrier and are implemented as:

The length of the waiting time according to each transmission first bag of flow data described obtains the first sequence of described transmission flow data；

Transmit the priority of flow data according in described first sequence, be followed successively by described transmission flow data distribution subcarrier according to CNU corresponding to described transmission flow data SNR information on each subcarrier.

In the 5th kind of possible implementation, in conjunction with the 4th kind of possible implementation, the method also includes:

After each transmission flow data described divides equally sub-carriers, if also having the residue unallocated described transmitting data stream of subcarrier, then use each other data priority on described residue subcarrier described in the length computation of queue according to each other data described；

On described residue subcarrier, other data described are distributed according to each other data described priority on described residue subcarrier.

Second aspect, provide a kind of coaxial medium converter, it is applied to based on coaxial Ethernet passive optical network EPOC system, described EPOC system includes optical line terminal OLT, coaxial medium transducer CMC and at least one coaxial network unit CNU, described OLT is connected by optical fiber with described CMC, and described CMC is connected by coaxial cable with at least one CNU described, it is characterized in that, this transducer includes:

Optical network unit ONU, the data stream sent for obtaining described OLT each CNU at least one CNU described will arrive Mean Speed or the data volume of described CMC, and the signal to noise ratio snr information that each CNU described of reception each CNU described transmission is on each subcarrier in the next cycle of current period.

Copper wire terminal CLT, described data stream for obtaining according to described ONU will arrive Mean Speed or the data volume of described CMC in the next cycle of current period, and each CNU described signal to noise ratio snr information on each subcarrier is respectively the data flow point sub-carriers that described OLT sends to each CNU described.

In the implementation that the first is possible, in conjunction with second aspect, ONU is implemented as:

Memorizer, for recording remaining data amount or the bandwidth of excess distribution of caching in described CMC within each cycle；

Receptor, is used for each CNU described receiving described each CNU transmission signal to noise ratio snr information on each subcarrier；

Processor, will arrive Mean Speed or the data volume of described CMC in the next cycle according to current period described in the remaining data amount of caching in the described CMC in each cycle described or the bandwidth calculation of excess distribution.

In the implementation that the second is possible, in conjunction with the third aspect or implementation that the first is possible, ONU is additionally operable to:

The data stream sent by the described OLT received each CNU at least one CNU described is divided into transmission flow data and other data in addition to described transmission flow data according to type of service；Accordingly,

Memorizer is additionally operable to, and the transmission flow data obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period；

Described processor is additionally operable to: will arrive Mean Speed or the data volume of described CMC in the next cycle of current period according to described transmission flow data, and each CNU described SNR information on each subcarrier is respectively each described transmission flow data distribution subcarrier.

In the implementation that the third is possible, in conjunction with second aspect, CLT is implemented as:

CLT, Mean Speed or data volume for will arrive described CMC in the next cycle of current period according to transmission flow data each described calculates the waiting time of each transmission first bag of flow data of caching in described CMC, and the waiting time and each CNU described signal to noise ratio snr information on each subcarrier according to each transmission first bag of flow data described is respectively each transmission flow data distribution subcarrier.

In the 4th kind of possible implementation, in conjunction with the implementation that the third is possible, CLT is additionally operable to:

The length of the waiting time according to each transmission first bag of flow data described obtains the first sequence of described transmission flow data；

Transmit the priority of flow data according in described first sequence, be followed successively by described transmission flow data distribution subcarrier according to CNU corresponding to described transmission flow data SNR information on each subcarrier.

In the 5th kind of possible implementation, in conjunction with the 4th kind of possible implementation, CLT is additionally operable to:

After each transmission flow data described divides equally sub-carriers, if also having the residue unallocated described transmitting data stream of subcarrier, then use each other data priority on described residue subcarrier described in the length computation of queue according to each other data described；

On described residue subcarrier, other data described are distributed according to each other data described priority on described residue subcarrier.

The third aspect, it is provided that a sub-carrier distribution system, is applied to based on coaxial Ethernet passive optical network EPOC, and this system includes:

Optical line terminal OLT, coaxial medium transducer CMC and at least one coaxial network unit CNU, described OLT is connected by optical fiber with described CMC, described CMC is connected by coaxial cable with at least one CNU described, it is characterized in that, described CMC is used for: the data stream obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of next cycle current period；Each CNU described that each CNU described in receiving sends signal to noise ratio snr information on each subcarrier；Mean Speed or the data volume of described CMC will be arrived according to described data stream in the next cycle of current period, and each CNU described signal to noise ratio snr information on each subcarrier will be respectively the data flow point sub-carriers that described OLT sends to each CNU described.

A kind of sub-carrier wave distribution method, equipment and the system that the embodiment of the present invention provides, Mean Speed or the data volume of CMC will be arrived in the next cycle of current period to the data stream that each CNU sends by prediction OLT, and to combine each CNU signal to noise ratio snr information on each subcarrier be that each CNU dynamically distributes subcarrier, and then improve utilization rate and the QoS of subcarrier, solve prior art according to fixed rate to the TS stream distribution fixed-bandwidth of transmission, and the waste of the bandwidth resources caused or the problem of QoS difference.

Accompanying drawing explanation

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

The flow chart of the distribution method of the sub-carrier that Fig. 1 provides for the embodiment of the present invention；

The flow chart of the Fig. 2 distribution method of another kind of subcarrier for providing for the embodiment of the present invention；

The schematic diagram of a kind of coaxial medium converter that Fig. 3 provides for the embodiment of the present invention；

The schematic diagram of the another kind of coaxial medium converter that Fig. 4 provides for the embodiment of the present invention；

The schematic diagram of the another kind of coaxial medium converter that Fig. 5 provides for the embodiment of the present invention；

The system diagram of a kind of EPOC that Fig. 6 provides for the embodiment of the present invention.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.

On the one hand, the embodiment of the present invention provides a kind of sub-carrier wave distribution method, it is applied to based on coaxial Ethernet passive optical network EPOC system, described EPOC system includes optical line terminal OLT, coaxial medium transducer CMC and at least one coaxial network unit CNU, described OLT is connected by optical fiber with described CMC, and described CMC is connected by coaxial cable with at least one CNU described, seeing Fig. 1, described method includes:

101: the data stream obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period；

Exemplary, the data stream obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period, may include that

Remaining data amount or the bandwidth of excess distribution of caching in described CMC is recorded within each cycle；

Mean Speed or the data volume of described CMC will be arrived in next cycle according to current period described in the remaining data amount of caching in the described CMC in each cycle described or the bandwidth calculation of excess distribution.

102: each CNU described that each CNU described in receiving the sends signal to noise ratio snr information on each subcarrier；

103: Mean Speed or the data volume of described CMC will be arrived in the next cycle of current period according to described data stream, and each CNU described signal to noise ratio snr information on each subcarrier is respectively the data flow point sub-carriers that described OLT sends to each CNU described.

Exemplary, before the data stream obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period, the method can also include:

The data stream sent by the described OLT received each CNU at least one CNU described is divided into transmission flow data and other data in addition to described transmission flow data according to type of service；Accordingly,

The data stream obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period, may include that the transmission flow data of each CNU transmission obtaining described OLT at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period；

Mean Speed or the data volume of described CMC will be arrived in the next cycle of current period according to described data stream, it is respectively, with each CNU described signal to noise ratio snr information on each subcarrier, the data flow point sub-carriers that described OLT sends to each CNU described, may include that

Mean Speed or the data volume of described CMC will be arrived according to described transmission flow data in the next cycle of current period, and each CNU described SNR information on each subcarrier will be respectively each described transmission flow data distribution subcarrier.

Exemplary, Mean Speed or the data volume of described CMC will be arrived in the next cycle of current period according to described transmission flow data, it is respectively each described transmission flow data distribution subcarrier with each CNU described SNR information on each subcarrier, may include that

The Mean Speed of described CMC will be arrived in the next cycle of current period according to transmission flow data each described or data volume will calculate the waiting time of each transmission first bag of flow data of caching in described CMC；

Waiting time and each CNU described signal to noise ratio snr information on each subcarrier according to each transmission first bag of flow data described are respectively each transmission flow data distribution subcarrier.

Exemplary, the method can also include:

After each transmission flow data described divides equally sub-carriers, if also having the residue unallocated described transmitting data stream of subcarrier, then use each other data priority on described residue subcarrier described in the length computation of queue according to each other data described；

On described residue subcarrier, other data described are distributed according to each other data described priority on described residue subcarrier.

A kind of sub-carrier wave distribution method that the embodiment of the present invention provides, Mean Speed or the data volume of CMC will be arrived in the next cycle of current period to the data stream that each CNU sends by prediction OLT, and to combine each CNU signal to noise ratio snr information on each subcarrier be that each CNU dynamically distributes subcarrier, and then improve utilization rate and the QoS of subcarrier, solve prior art according to fixed rate to the TS stream distribution fixed-bandwidth of transmission, and the waste of the bandwidth resources caused or the problem of QoS difference.

See Fig. 2, the flow chart of the distribution method of the another kind of subcarrier that the embodiment of the present invention provides, as it can be seen, may comprise steps of:

201: the data stream sent by each CNU at least one CNU described of described OLT received is divided into transmission flow data and other data in addition to described transmission flow data according to type of service；

Exemplary, the distribution method of subcarrier that the embodiment of the present invention provides can apply to EPOC system, EPOC system by OLT, CMC and CNU tri-part constitute, wherein OLT with CMC is connected by optical fiber, CMC with ONU is connected by coaxial cable, and CMC40 is it is believed that be made up of ONU and CLT.Part between CMC and OLT is MAC layer, and the part between CMC and CNU is physical layer.

Exemplary, transmission stream (TransportStream is called for short TS) data are made up of a lot of different types of packets, and these packets can include the most eurypalynous data, such as video, audio frequency, self-defined information etc., each packet comprises 188 bytes.The feature of such business is: to delay sensitive, the stronger opposing ability of transmission error code, the features such as length is fixing of packet.

Other data (BestEffort is called for short BE) in addition to described transmission flow data, the business i.e. done one's best.The feature of such business is: insensitive to time delay, but require that the error rate that data are transmitted is low, there is no guarantee that bandwidth requirement, business burst strong.Specifically can include browsing webpage, downloading file, transmitting-receiving Email etc..

It is divided into streaming flow data and other data in addition to described transmission flow data by the data that OLT is sent to CNU, TS flow data distribution subcarrier can be preferably, can effectively ensure the quality of video flowing, and can be that data reasonably distribute bandwidth, thus improve bandwidth availability ratio.

202: the transmission flow data obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period；

Exemplary, CMC can preset a cycle, and the length in cycle is arranged according to actual needs, when the cycle set is sufficiently small, it is believed that acquisition is real time rate or the data volume arriving CMC.

Mean Speed or the data volume of the transmission flow data of CMC will be arrived in next cycle according to current period and period forecasting current period before thereof, be described in detail separately below:

1, exemplary, the transmission flow data obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period, including:

Remaining data amount or the bandwidth of excess distribution of the transmission flow data of caching in described CMC is recorded within each cycle；

Exemplary, arrive the Mean Speed of CMC the next cycle of current period can be predicted by the bandwidth of the remaining data amount of record transmission flow data or excess distribution in.Illustrate separately below.

The mode of the remaining data amount of the transmission flow data of caching in a, record CMC.

Exemplary, in each cycle, in CMC, remaining data amount W of the transmission flow data of caching is actually reached data volume W of CMC in referring to each cycle₁Data volume W with caching₀Difference (W₁-W₀), W₁-W₀Can represent with σ, work as W₁More than W₀Time, σ be on the occasion of；Contrary σ is negative value.

Exemplary, can record σ in each cycle, then after some cycle T, can obtain one group about cycle and the data of the σ of correspondence thereof, such as: the most corresponding σ of T1, T2, T3, T4......Tn₁、σ₂、σ₃、σ₄......σ_n、。

B, it is recorded as transmitting the mode of bandwidth of flow data excess distribution.

Exemplary, the bandwidth BW for transmission flow data excess distribution in each cycle refers to that OLT is the bandwidth BW of the transmission actual distribution of flow data in area of light transmission in each cycle₁The bandwidth BW needed with this transmission flow data₀Difference (BW₁-BW₀), BW₁-BW₀Can represent with δ, work as BW₁More than BW₀Time, δ be on the occasion of；Contrary δ is negative value.

Exemplary, can record δ in each cycle, then after some cycle T, can obtain one group about cycle and the data of the δ of correspondence thereof, such as: T1, T2, T3, T4......Tn the most corresponding δ 1, δ 2, δ 3, δ 4...... δ n.

2, Mean Speed or the data volume of the transmission flow data of described CMC will be arrived in the next cycle according to current period described in the remaining data amount of the transmission flow data of caching in the described CMC in each cycle described or the bandwidth calculation of excess distribution.

Exemplary, if the Mean Speed arriving the transmission flow data of CMC in the n-th cycle (current period) is m^WN (), data volume is W (n), and the Mean Speed of the transmission flow data arriving CMC in the cycle in the n-th-d cycle is m^W(n-d), data volume is W (n-d), and the Mean Speed of the transmission flow data arriving CMC in (n+1)th cycle (the later cycle of current period) is m^W(n+1), data volume is W (n+1).

Four kinds of situations are divided to illustrate respectively below.

A, according to σ value calculate current period next cycle in will arrive CMC transmission flow data Mean Speed.

The proportionate relationship of the Mean Speed arriving the transmission flow data of CMC in the Mean Speed cycle individual with the n-th-d of the transmission flow data arriving CMC in the n-th cycle can be according to formulaCalculate.Analogy can obtain: the Mean Speed of the data volume arriving the transmission flow data of CMC in (n+1)th cycle is

Wherein, m^WN () can be according to (W₀+σ_n)/T obtains,

Can be according to formulaTrying to achieve, wherein, ω (k) is coefficient, and p isExponent number, x^W(n-k) can be according to (W₀+σ_n-k)/T obtains.

B, calculate the next cycle of current period according to σ value in will arrive the data volume of CMC.

Exemplary, w (n+1) can be by the acquisition in said method aObtain, it is also possible to according to formula $w(n+1)=w\left(n\right)+{\hat{R}}^W(n+1)w\left(n\right)$ Try to achieve.

Wherein, w (n) can be according to w₀+σ_nObtain,

Can be according to formulaTrying to achieve, wherein, ω (k) is coefficient, and p isExponent number, w (n-k) can be according to w₀+σ_n-kObtain.

C, according to δ-value calculate current period next cycle in will arrive CMC transmission flow data Mean Speed.

Exemplary, arrive Mean Speed m of the transmission flow data of CMC in the n-th cycle (current period)^WN () can be according to the bandwidth BW that OLT in the n-th cycle is transmission flow data distribution₀(n) and δ_nAnd (BW₀(n)+δ_n) obtain, other calculating process is with method a.

D, according to σ value calculate current period next cycle in will arrive CMC transmission flow data data volume.

Exemplary, w (n+1) can be by acquisition in said method a or method cObtain, it is also possible to according to formula $w(n+1)=w\left(n\right)+{\hat{R}}^W(n+1)w\left(n\right)$ Try to achieve.

203: each CNU described that each CNU described in receiving the sends signal to noise ratio snr information on each subcarrier；

Exemplary, CNU signal to noise ratio snr information on each subcarrier can be sent to CMC by report frame.

204: Mean Speed or the data volume of described CMC will be arrived in the next cycle of current period according to described transmission flow data, and each CNU described signal to noise ratio snr information on each subcarrier is respectively the data flow point sub-carriers that described OLT sends to each CNU described.

Exemplary, Mean Speed or the data volume of described CMC will be arrived in the next cycle of current period according to described transmission flow data, it is respectively the data flow point sub-carriers that described OLT sends to each CNU described with each CNU described signal to noise ratio snr information on each subcarrier, including:

Mean Speed m of described CMC will be arrived in the next cycle of current period according to transmission flow data each described^WOr data volume w (n+1) calculates in described CMC the waiting time t of each transmission first bag of flow data of caching (n+1)；

Exemplary, for a transmission flow data, waiting time t can be by the transmission flow data of caching in CMC divided by Mean Speed m^W(n+1) obtain, or cycle T can be multiplied by again divided by data volume w (n+1) obtained by the transmission flow data of caching in CMC.

Waiting time and each CNU described signal to noise ratio snr information on each subcarrier according to each transmission first bag of flow data described are respectively each transmission flow data distribution subcarrier.

Exemplary, the waiting time of each transmission first bag of flow data described in described basis and each CNU described signal to noise ratio snr information on each subcarrier are respectively each transmission flow data distribution subcarrier, may include that

The length of the waiting time according to each transmission first bag of flow data described obtains the first sequence of described transmission flow data；

Exemplary, it is assumed that one has 8 CNU, and each CNU all comprises transmission streaming data traffic, obtains the first sequence after being ranked up according to the order ascending for waiting time t of each first bag of transmission flow data.If there being the waiting time t of the first bag of at least two transmission flow data identical, then this at least two transmission flow data can random alignment.If the ranking results of the first sequence is: TS0, TS1, TS2, TS3, TS4, TS5, TS6, TS7, corresponding CNU order is followed successively by: CNU0, CNU1, CNU2, CNU3, CNU4, CNU5, CNU6, CNU7.

Transmit the priority of flow data according in described first sequence, be followed successively by described transmission flow data distribution subcarrier according to CNU corresponding to described transmission flow data SNR information on each subcarrier.

Assume that one has 10 subcarriers, and these 10 subcarriers are numbered, respectively No. 0-9.Successively CNU SNR value on each subcarrier that transmission flow data is corresponding is carried out traversal by the priority of the first sequence to calculate, the priority of the biggest then subcarrier of SNR value is the highest, for a transmission flow data, the highest subcarrier of CNU corresponding for this transmission flow data is distributed to this transmission flow data.If the SNR value that a certain CNU is on remaining at least two subcarrier is identical and be maximum, then randomly chooses any one in this at least two subcarrier and distribute to transmission flow data corresponding for this CNU.As shown in table 1, for each CNU SNR information on each subcarrier.

Table 1

Specifically, according to the first sequence, preferably should distribute subcarrier to TS0, CNU0 SNR value on 0-9 sub carriers is expressed as SNR00, SNR01, SNR02...SNR09, the relatively size of these 10 SNR value, subcarrier corresponding for maximum SNR value is distributed to TS0, distributes subcarrier to successively further according to the method TS1, TS2, TS3, TS4, TS5, TS6, TS7.

205: after each transmission flow data described divides equally sub-carriers, it may be judged whether also have the residue unallocated described transmitting data stream of subcarrier；

Exemplary, in the example shown in 204, after being respectively allocated subcarrier for TS0, TS1, TS2, TS3, TS4, TS5, TS6, TS7, the most remaining two subcarriers.

206: if also having the residue unallocated described transmitting data stream of subcarrier, then use each other BE data priority on described residue subcarrier described in the length computation of queue according to each other data described；

207: on described residue subcarrier, distribute other data described according to each other data described priority on described residue subcarrier, until subcarrier is assigned；

Exemplary, use the descending of queue length BE data to be ranked up according to BE data, distribute to remain in subcarrier than especially big subcarrier by the high data that sort.

208: if not remaining the unallocated described transmitting data stream of subcarrier, then terminate.

nullA kind of sub-carrier wave distribution method that the embodiment of the present invention provides，Mean Speed or the data volume of CMC will be arrived in the next cycle of current period to the data stream that each CNU sends by prediction OLT，And to combine each CNU signal to noise ratio snr information on each subcarrier be that each CNU dynamically distributes subcarrier，That is，Mean Speed or the data volume of the transmission flow data that will arrive CMC in the next cycle of current period are passed to physical layer as inter-layer information，Physical layer reasonably distributes sub-carrier resources under the constraint of cross-layer information and each CNU signal to noise ratio snr information on each subcarrier，And then improve utilization rate and the QoS of subcarrier，Solve prior art according to fixed rate to the TS stream distribution fixed-bandwidth of transmission，And the waste of the bandwidth resources caused or the problem of QoS difference.

On the other hand, embodiments provide a kind of CMC30, it is applied to EPOC system, described EPOC system includes optical line terminal OLT, CMC30 and at least one coaxial network unit CNU, described OLT is connected by optical fiber with described CMC30, and described CMC30 is connected by coaxial cable with at least one CNU described, seeing Fig. 3, this CMC30 may include that

ONU301, the data stream sent for obtaining described OLT each CNU at least one CNU described will arrive Mean Speed or the data volume of described CMC30, and the signal to noise ratio snr information that each CNU described of reception each CNU described transmission is on each subcarrier in the next cycle of current period；

See Fig. 4, ONU301 can include,

Memorizer 3011, for recording remaining data amount or the bandwidth of excess distribution of caching in described CMC30 within each cycle；

Receptor 3012, is used for each CNU described receiving described each CNU transmission signal to noise ratio snr information on each subcarrier；

Processor 3013, will arrive Mean Speed or the data volume of described CMC in the next cycle according to current period described in the remaining data amount of caching in the described CMC30 in each cycle described or the bandwidth calculation of excess distribution；

Copper wire terminal (CopperLineTermination, it is called for short CLT) 302, described data stream for obtaining according to described ONU301 will arrive Mean Speed or the data volume of described CMC30 in the next cycle of current period, and each CNU described signal to noise ratio snr information on each subcarrier is respectively the data flow point sub-carriers that described OLT sends to each CNU described.

Further, described ONU301 is additionally operable to: the data stream sent by each CNU at least one CNU described of described OLT received is divided into transmission flow data and other data in addition to described transmission flow data according to type of service；

ONU301 is divided into streaming flow data and other data in addition to described transmission flow data by the data that OLT is sent to CNU, so that CLT302 is preferably TS flow point sub-carriers, can effectively ensure the quality of video flowing, and can be that data reasonably distribute bandwidth, thus improve bandwidth availability ratio.

Described memorizer 3011 is additionally operable to, and the transmission flow data obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period；

Illustrate as a example by transmission flow data below.

Exemplary, ONU301 will arrive the Mean Speed of CMC30 can be predicted the next cycle of current period by the bandwidth of the remaining data amount of record transmission flow data or excess distribution in.Illustrate separately below.

The mode of the remaining data amount of caching in a, record CMC30.

Exemplary, in each cycle, in CMC30, remaining data amount W of the transmission flow data of caching is actually reached data volume W of CMC30 in referring to each cycle₁Data volume W with caching₀Difference (W₁-W₀), W₁-W₀Can represent with σ, work as W₁More than W₀Time, σ be on the occasion of；Contrary σ is negative value.

Exemplary, memorizer 3011 can record σ in each cycle, then after some cycle T, memorizer 3011 can obtain one group about cycle and the data of the σ of correspondence thereof, such as: the most corresponding σ of T1, T2, T3, T4......Tn₁、σ₂、σ₃、σ₄......σ_n。

The mode of the bandwidth that b, record excess are distributed.

Exemplary, the bandwidth BW of the excess distribution in each cycle refers to that OLT is the bandwidth BW of the transmission actual distribution of flow data in area of light transmission in each cycle₁The bandwidth BW needed with this transmission flow data₀Difference (BW₁-BW₀), BW₁-BW₀Can represent with δ, work as W₁More than W₀Time, δ be on the occasion of；Contrary δ is negative value.

Exemplary, memorizer 3011 can record δ in each cycle, then after some cycle T, memorizer 3011 can obtain one group about cycle and the data of the δ of correspondence thereof, such as: the most corresponding σ of T1, T2, T3, T4......Tn₁、σ₂、σ₃、σ₄......σ。

Described processor 3013 is additionally operable to: will arrive Mean Speed or the data volume of described CMC in the next cycle of current period according to described transmission flow data, and each CNU described SNR information on each subcarrier is respectively each described transmission flow data distribution subcarrier.

Exemplary, if the Mean Speed arriving the transmission flow data of CMC in the n-th cycle (current period) is m^WN (), data volume is W (n), and the Mean Speed of the transmission flow data arriving CMC in the cycle in the n-th-d cycle is m^W(n-d), data volume is W (n-d), and the Mean Speed of the transmission flow data arriving CMC in (n+1)th cycle (the later cycle of current period) is m^W(n+1), data volume is W (n+1).

Four kinds of situations are divided to illustrate respectively below.

A, processor 3013 will arrive the Mean Speed of CMC in calculating the next cycle of current period according to σ value.

The proportionate relationship of the Mean Speed arriving the transmission flow data of CMC in the Mean Speed cycle individual with the n-th-d of the transmission flow data arriving CMC in the n-th cycle can be according to formulaCalculate.Analogy can obtain: the Mean Speed of the transmission flow data arriving CMC in (n+1)th cycle is $m^W(n+1)=m^W\left(n\right)+{\hat{x}}^W(n+1)m^W\left(n\right).$

Wherein, m^WN () can be according to (W₀+σ_n)/T obtains,

Can be according to formulaTrying to achieve, wherein, ω (k) is coefficient, and p isExponent number, x^W(n-k) can be according to (W₀+σ_n-k)/T obtains.

B, processor 3013 will arrive the data volume of the transmission flow data of CMC in calculating the next cycle of current period according to σ value.

Exemplary, w (n+1) can be by the acquisition in said method aObtain, it is also possible to according to formula $w(n+1)=w\left(n\right)+{\hat{R}}^W(n+1)w\left(n\right)$ Try to achieve.

Wherein, w (n) can be according to w₀+σ_nObtain,

Can be according to formulaTrying to achieve, wherein, ω (k) is coefficient, and p isExponent number, w (n-k) can be according to w₀+σ_n-kObtain.

C, processor 3013 will arrive the Mean Speed of the transmission flow data of CMC in calculating the next cycle of current period according to δ-value.

Exemplary, arrive Mean Speed m of the transmission flow data of CMC in the n-th cycle (current period)^WN () can be according to the bandwidth BW of OLT distribution in the n-th cycle₀(n) and δ_nAnd (BW₀(n)+δ_n) obtain, other calculating process is with method a.

D, processor 3013 will arrive the data volume of the transmission flow data of CMC in calculating the next cycle of current period according to σ value.

Exemplary, w (n+1) can be by acquisition in said method a or method cObtain, it is also possible to according to formula $w(n+1)=w\left(n\right)+{\hat{R}}^W(n+1)w\left(n\right)$ Try to achieve.

Described CLT302 can be also used for: will arrive the Mean Speed of described CMC in the next cycle of current period according to transmission flow data each described or data volume calculates the waiting time of each transmission first bag of flow data of caching in described CMC, and the waiting time and each CNU described signal to noise ratio snr information on each subcarrier according to each transmission first bag of flow data described is respectively each transmission flow data distribution subcarrier.

Exemplary, described CLT302 is implemented as:

Mean Speed m of described CMC will be arrived in the next cycle of current period according to transmission flow data each described^WOr data volume W (n+1) calculates in described CMC the waiting time t of each transmission first bag of flow data of caching (n+1)；

Exemplary, for a transmission flow data, waiting time t can be by the transmission flow data of caching in CMC divided by Mean Speed m^W(n+1) obtain, or cycle T can be multiplied by again divided by data volume W (n+1) obtained by the transmission flow data of caching in CMC.

Waiting time and each CNU described signal to noise ratio snr information on each subcarrier according to each transmission first bag of flow data described are respectively each transmission flow data distribution subcarrier.

Exemplary, the waiting time of each transmission first bag of flow data described in described basis and each CNU described signal to noise ratio snr information on each subcarrier are respectively each transmission flow data distribution subcarrier, may include that

The length of the waiting time according to each transmission first bag of flow data described obtains the first sequence of described transmission flow data；

Exemplary, it is assumed that one has 8 CNU, and each CNU all comprises transmission streaming data traffic, obtains the first sequence after being ranked up according to the order ascending for waiting time t of each first bag of transmission flow data.If there being the waiting time t of the first bag of at least two transmission flow data identical, then this at least two transmission flow data can random alignment.If the ranking results of the first sequence is: TS0, TS1, TS2, TS3, TS4, TS5, TS6, TS7, corresponding CNU order is followed successively by: CNU0, CNU1, CNU2, CNU3, CNU4, CNU5, CNU6, CNU7.

Transmit the priority of flow data according in described first sequence, be followed successively by described transmission flow data distribution subcarrier according to CNU corresponding to described transmission flow data SNR information on each subcarrier.

Assume that one has 10 subcarriers, and these 10 subcarriers are numbered, respectively No. 0-9.Successively CNU SNR value on each subcarrier that transmission flow data is corresponding is carried out traversal by the priority of the first sequence to calculate, the priority of the biggest then subcarrier of SNR value is the highest, for a transmission flow data, the highest subcarrier of CNU corresponding for this transmission flow data is distributed to this transmission flow data.If the SNR value that a certain CNU is on remaining at least two subcarrier is identical and be maximum, then randomly chooses any one in this at least two subcarrier and distribute to transmission flow data corresponding for this CNU.As shown in table 1, for each CNU SNR information on each subcarrier.

Specifically, according to the first sequence, preferably should distribute subcarrier to TS0, CNU0 SNR value on 0-9 sub carriers is expressed as SNR00, SNR01, SNR02...SNR09, the relatively size of these 10 SNR value, subcarrier corresponding for maximum SNR value is distributed to TS0, distributes subcarrier to successively further according to the method TS1, TS2, TS3, TS4, TS5, TS6, TS7.

Exemplary, described CLT302 is additionally operable to:

After each transmission flow data described divides equally sub-carriers, if also having the residue unallocated described transmitting data stream of subcarrier, then use each other data priority on described residue subcarrier described in the length computation of queue according to each other data described；

On described residue subcarrier, other data described are distributed according to each other data described priority on described residue subcarrier.

Exemplary, CLT302 is after each transmission flow data divides equally sub-carriers, it may be judged whether also have the residue unallocated described transmitting data stream of subcarrier；Such as, after being respectively allocated subcarrier for TS0, TS1, TS2, TS3, TS4, TS5, TS6, TS7, also have remaining two subcarriers, then CLT302 uses the descending of queue length BE data to be ranked up according to BE data, distributes to remain in subcarrier than especially big subcarrier by the high data that sort.

The CMC30 that the embodiment of the present invention provides, Mean Speed or the data volume of CMC will be arrived in the next cycle of current period to the data stream that each CNU sends by prediction OLT, and to combine each CNU signal to noise ratio snr information on each subcarrier be that each CNU dynamically distributes subcarrier, and then improve utilization rate and the QoS of subcarrier, solve prior art according to fixed rate to the TS stream distribution fixed-bandwidth of transmission, and the waste of the bandwidth resources caused or the problem of QoS difference.

See Fig. 5, the another kind of CMC30 that the present invention provides, it is applied to EPOC system, described EPOC system includes optical line terminal OLT, CMC30 and at least one coaxial network unit CNU, described OLT is connected by optical fiber with described CMC30, and described CMC30 is connected by coaxial cable with at least one CNU described, and this CMC30 may include that

Memorizer 501, for recording remaining data amount or the bandwidth of excess distribution that the data stream of the described OLT each CNU transmission at least one CNU described caches in described CMC30 within each cycle；

Receptor 502, is used for each CNU described receiving described each CNU transmission signal to noise ratio snr information on each subcarrier；

Processor 503, for Mean Speed or the data volume that will arrive described CMC30 according to data stream described in the remaining data amount of caching in the described memorizer 501 in each cycle described or the bandwidth calculation of excess distribution in the next cycle of current period, and will arrive Mean Speed or the data volume of described CMC30 in the next cycle of current period according to described data stream, and each CNU described signal to noise ratio snr information on each subcarrier is respectively the data flow point sub-carriers that described OLT sends to each CNU described.

Transmitter 504, for sending the described data stream of correspondence to each CNU described on the subcarrier of the data stream distribution sent for described OLT.

Further, described processor 503 is additionally operable to: the data stream sent by each CNU at least one CNU described of described OLT received is divided into transmission flow data and other data in addition to described transmission flow data according to type of service；

Described processor 503 is divided into streaming flow data and other data in addition to described transmission flow data by the data that OLT is sent to CNU, TS flow point sub-carriers can be preferably, and then effectively ensure the quality of video flowing, and can be that data reasonably distribute bandwidth, thus improve bandwidth availability ratio.

Described memorizer 501 is additionally operable to, and records remaining data amount that the transmitting data stream that each CNU at least one CNU described of described OLT sends cache in described CMC30 or the bandwidth that excess is distributed within each cycle；

Illustrate respectively as a example by transmission flow data below.

The remaining data amount of caching in a, record CMC30.

Exemplary, in each cycle, in CMC30, remaining data amount W of the transmission flow data of caching is actually reached data volume W of CMC30 in referring to each cycle₁Data volume W with caching₀Difference (W₁-W₀), W₁-W₀Can represent with σ, work as W₁More than W₀Time, σ be on the occasion of；Contrary σ is negative value.

Exemplary, memorizer 501 can record σ in each cycle, then after some cycle T, memorizer 501 can obtain one group about cycle and the data of the σ of correspondence thereof, such as: the most corresponding σ of T1, T2, T3, T4......Tn₁、σ₂、σ₃、σ₄......σ_n。

B, the bandwidth of record excess distribution.

Exemplary, the bandwidth BW of the excess distribution in each cycle refers to that OLT is the bandwidth BW of the transmission actual distribution of flow data in area of light transmission in each cycle₁The bandwidth BW needed with this transmission flow data₀Difference (BW₁-BW₀), BW₁-BW₀Can represent with δ, work as W₁More than W₀Time, δ be on the occasion of；Contrary δ is negative value.

Exemplary, memorizer 501 can record δ in each cycle, then after some cycle T, memorizer 501 can obtain one group about cycle and the data of the δ of correspondence thereof, such as: the most corresponding σ of T1, T2, T3, T4......Tn₁、σ₂、σ₃、σ₄......σ。

Described processor 503 is additionally operable to, and transmitting data stream described in the remaining data amount of transmitting data stream recorded according to the described memorizer 501 in each cycle described or the bandwidth calculation of excess distribution will arrive Mean Speed or the data volume of described CMC30 in the next cycle of current period；

Exemplary, if the Mean Speed arriving the transmission flow data of CMC in the n-th cycle (current period) is m^WN (), data volume is W (n), and the Mean Speed of the transmission flow data arriving CMC in the cycle in the n-th-d cycle is m^W(n-d), data volume is W (n-d), and the Mean Speed of the transmission flow data arriving CMC in (n+1)th cycle (the later cycle of current period) is m^W(n+1), data volume is W (n+1).

Four kinds of situations are divided to illustrate respectively below.

A, processor 503 will arrive the Mean Speed of CMC in calculating the next cycle of current period according to σ value.

The proportionate relationship of the Mean Speed arriving the transmission flow data of CMC in the Mean Speed cycle individual with the n-th-d of the transmission flow data arriving CMC in the n-th cycle can be according to formulaCalculate.Analogy can obtain: the Mean Speed of the transmission flow data arriving CMC in (n+1)th cycle is $m^W(n+1)=m^W\left(n\right)+{\hat{x}}^W(n+1)m^W\left(n\right).$

Wherein, m^WN () can be according to (W₀+σ_n)/T obtains,

Can be according to formulaTrying to achieve, wherein, ω (k) is coefficient, and p isExponent number, x^W(n-k) can be according to (W₀+σ_n-k)/T obtains.

B, processor 503 will arrive the data volume of the transmission flow data of CMC in calculating the next cycle of current period according to σ value.

Exemplary, w (n+1) can be by the acquisition in said method aObtain, it is also possible to according to formula $w(n+1)=w\left(n\right)+{\hat{R}}^W(n+1)w\left(n\right)$ Try to achieve.

Wherein, w (n) can be according to w₀+σ_nObtain,Can be according to formulaTrying to achieve, wherein, ω (k) is coefficient, and p isExponent number, w (n-k) can be according to w₀+σ_n-kObtain.

C, processor 503 will arrive the Mean Speed of the transmission flow data of CMC in calculating the next cycle of current period according to δ-value.

Exemplary, arrive Mean Speed m of the transmission flow data of CMC in the n-th cycle (current period)^WN () can be according to the bandwidth BW of OLT distribution in the n-th cycle₀(n) and δ_nAnd (BW₀(n)+δ_n) obtain, other calculating process is with method a.

D, processor 503 will arrive the data volume of the transmission flow data of CMC in calculating the next cycle of current period according to σ value.

Exemplary, w (n+1) can be by acquisition in said method a or method cObtain, it is also possible to according to formula $w(n+1)=w\left(n\right)+{\hat{R}}^W(n+1)w\left(n\right)$ Try to achieve.

Described processor 503 is additionally operable to, Mean Speed or the data volume of described CMC30 will be arrived according to described transmitting data stream in the next cycle of current period, and each CNU described signal to noise ratio snr information on each subcarrier will be respectively the transmitting data stream distribution subcarrier that described OLT sends to each CNU described.

Exemplary, this process can be implemented as:

1, Mean Speed m of described CMC will be arrived in the next cycle of current period according to transmission flow data each described^WOr data volume W (n+1) calculates in described CMC the waiting time t of each transmission first bag of flow data of caching (n+1)；

Exemplary, for a transmission flow data, waiting time t can be by the transmission flow data of caching in CMC divided by Mean Speed m^W(n+1) obtain, or cycle T can be multiplied by again divided by data volume W (n+1) obtained by the transmission flow data of caching in CMC.

2, waiting time and each CNU described signal to noise ratio snr information on each subcarrier according to each transmission first bag of flow data described are respectively each transmission flow data distribution subcarrier.

Exemplary, waiting time and each CNU described signal to noise ratio snr information on each subcarrier according to each transmission first bag of flow data described are respectively each transmission flow data distribution subcarrier, may include that

The length of the waiting time according to each transmission first bag of flow data described obtains the first sequence of described transmission flow data；

Exemplary, it is assumed that one has 8 CNU, and each CNU all comprises transmission streaming data traffic, obtains the first sequence after being ranked up according to the order ascending for waiting time t of each first bag of transmission flow data.If there being the waiting time t of the first bag of at least two transmission flow data identical, then this at least two transmission flow data can random alignment.If the ranking results of the first sequence is: TS0, TS1, TS2, TS3, TS4, TS5, TS6, TS7, corresponding CNU order is followed successively by: CNU0, CNU1, CNU2, CNU3, CNU4, CNU5, CNU6, CNU7.

Transmit the priority of flow data according in described first sequence, be followed successively by described transmission flow data distribution subcarrier according to CNU corresponding to described transmission flow data SNR information on each subcarrier.

Assume that one has 10 subcarriers, and these 10 subcarriers are numbered, respectively No. 0-9.Successively CNU SNR value on each subcarrier that transmission flow data is corresponding is carried out traversal by the priority of the first sequence to calculate, the priority of the biggest then subcarrier of SNR value is the highest, for a transmission flow data, the highest subcarrier of CNU corresponding for this transmission flow data is distributed to this transmission flow data.If the SNR value that a certain CNU is on remaining at least two subcarrier is identical and be maximum, then randomly chooses any one in this at least two subcarrier and distribute to transmission flow data corresponding for this CNU.As shown in table 1, for each CNU SNR information on each subcarrier.

Specifically, according to the first sequence, preferably should distribute subcarrier to TS0, CNU0 SNR value on 0-9 sub carriers is expressed as SNR00, SNR01, SNR02...SNR09, the relatively size of these 10 SNR value, subcarrier corresponding for maximum SNR value is distributed to TS0, distributes subcarrier to successively further according to the method TS1, TS2, TS3, TS4, TS5, TS6, TS7.

Exemplary, described processor 503 is additionally operable to:

After each transmission flow data described divides equally sub-carriers, if also having the residue unallocated described transmitting data stream of subcarrier, then use each other data priority on described residue subcarrier described in the length computation of queue according to each other data described；

On described residue subcarrier, other data described are distributed according to each other data described priority on described residue subcarrier.

Exemplary, processor 503 is after each transmission flow data divides equally sub-carriers, it may be judged whether also have the residue unallocated described transmitting data stream of subcarrier；Such as, after being respectively allocated subcarrier for TS0, TS1, TS2, TS3, TS4, TS5, TS6, TS7, also have remaining two subcarriers, then transmitter 504 uses the descending of queue length BE data to be ranked up according to BE data, distributes to remain in subcarrier than especially big subcarrier by the high data that sort.

The CMC30 that the embodiment of the present invention provides, Mean Speed or the data volume of CMC30 will be arrived in the next cycle of current period to the data stream that each CNU sends by prediction OLT, and to combine each CNU signal to noise ratio snr information on each subcarrier be that each CNU dynamically distributes subcarrier, and then improve utilization rate and the QoS of subcarrier, solve prior art according to fixed rate to the TS stream distribution fixed-bandwidth of transmission, and the waste of the bandwidth resources caused or the problem of QoS difference.

Another further aspect, embodiments provide a sub-carrier distribution system, it is applied to based on EPOC, see Fig. 6, this system includes: OLT40, CMC30 and at least one coaxial network unit CNU50, described OLT40 and described CMC30 is connected by optical fiber 60, described CMC30 and at least one CNU50 described is connected by coaxial cable 70, it is characterized in that, described CMC30 is used for: the data stream obtaining the described OLT40 each CNU50 transmission at least one CNU50 described will arrive Mean Speed or the data volume of described CMC30 in the next cycle of current period；Each CNU50 described that each CNU50 described in receiving sends signal to noise ratio snr information on each subcarrier；Mean Speed or the data volume of described CMC30 will be arrived according to described data stream in the next cycle of current period, and each CNU50 described signal to noise ratio snr information on each subcarrier will be respectively the data flow point sub-carriers that described OLT40 sends to each CNU50 described.

The system that the embodiment of the present invention provides, Mean Speed or the data volume of CMC30 will be arrived in the next cycle of current period to the data stream that each CNU50 sends by CMC30 prediction OLT40, and to combine each CNU50 signal to noise ratio snr information on each subcarrier be that each CNU50 dynamically distributes subcarrier, and then improve utilization rate and the QoS of subcarrier, solve prior art according to fixed rate to the TS stream distribution fixed-bandwidth of transmission, and the waste of the bandwidth resources caused or the problem of QoS difference.

One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can be completed by the hardware that programmed instruction is relevant, aforesaid program can be stored in a computer read/write memory medium, this program upon execution, performs to include the step of said method embodiment；And aforesaid storage medium includes: the various media that can store program code such as ROM, RAM, magnetic disc or CDs.

The above; being only the detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; change can be readily occurred in or replace, all should contain within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.

Claims (13)

1. a sub-carrier wave distribution method, it is applied to based on coaxial Ethernet passive optical network EPOC system, described EPOC system includes optical line terminal OLT, coaxial medium transducer CMC and at least one coaxial network unit CNU, described OLT is connected by optical fiber with described CMC, described CMC is connected by coaxial cable with at least one CNU described, it is characterised in that described method includes:

The data stream obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period；

Each CNU described that each CNU described in receiving sends signal to noise ratio snr information on each subcarrier；

Mean Speed or the data volume of described CMC will be arrived according to described data stream in the next cycle of current period, and each CNU described signal to noise ratio snr information on each subcarrier will be respectively the data flow point sub-carriers that described OLT sends to each CNU described.

Sub-carrier wave distribution method the most according to claim 1, it is characterized in that, the data stream that the described OLT of described acquisition each CNU at least one CNU described sends will arrive Mean Speed or the data volume of described CMC in the next cycle of current period, including:

Remaining data amount or the bandwidth of excess distribution of caching in described CMC is recorded within each cycle；

Mean Speed or the data volume of described CMC will be arrived in next cycle according to current period described in the remaining data amount of caching in the described CMC in each cycle described or the bandwidth calculation of excess distribution.

Sub-carrier wave distribution method the most according to claim 1 and 2, it is characterized in that, before the data stream of the described OLT of described acquisition each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period, described method also includes:

The data stream sent by the described OLT received each CNU at least one CNU described is divided into transmission flow data and other data in addition to described transmission flow data according to type of service；Accordingly,

The data stream that the described OLT of described acquisition each CNU at least one CNU described sends will arrive Mean Speed or the data volume of described CMC in the next cycle of current period, including: the transmission flow data obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period；

Described Mean Speed or the data volume that will arrive described CMC according to described data stream in the next cycle of current period, it is respectively the data flow point sub-carriers that described OLT sends to each CNU described with each CNU described signal to noise ratio snr information on each subcarrier, including: Mean Speed or the data volume of described CMC will be arrived according to described transmission flow data in the next cycle of current period, and each CNU described SNR information on each subcarrier will be respectively each described transmission flow data distribution subcarrier.

Sub-carrier wave distribution method the most according to claim 3, it is characterized in that, described Mean Speed or the data volume that will arrive described CMC according to described transmission flow data in the next cycle of current period, it is respectively each described transmission flow data distribution subcarrier with each CNU described SNR information on each subcarrier, including:

The Mean Speed of described CMC will be arrived in the next cycle of current period according to transmission flow data each described or data volume will calculate the waiting time of each transmission first bag of flow data of caching in described CMC；

Waiting time and each CNU described signal to noise ratio snr information on each subcarrier according to each transmission first bag of flow data described are respectively each transmission flow data distribution subcarrier.

Sub-carrier wave distribution method the most according to claim 4, it is characterized in that, the waiting time of each transmission first bag of flow data described in described basis and each CNU described signal to noise ratio snr information on each subcarrier are respectively each transmission flow data distribution subcarrier, including:

The length of the waiting time according to each transmission first bag of flow data described obtains the first sequence of described transmission flow data；

Transmit the priority of flow data according in described first sequence, be followed successively by described transmission flow data distribution subcarrier according to CNU corresponding to described transmission flow data SNR information on each subcarrier.

Sub-carrier wave distribution method the most according to claim 5, it is characterised in that described method also includes:

After each transmission flow data described divides equally sub-carriers, if also having the residue unallocated described transmission flow data of subcarrier, then use each other data priority on described residue subcarrier described in the length computation of queue according to each other data described；

On described residue subcarrier, other data described are distributed according to each other data described priority on described residue subcarrier.

7. a coaxial medium transducer, it is applied to based on coaxial Ethernet passive optical network EPOC system, described EPOC system includes optical line terminal OLT, coaxial medium transducer CMC and at least one coaxial network unit CNU, described OLT is connected by optical fiber with described CMC, described CMC is connected by coaxial cable with at least one CNU described, it is characterised in that described CMC includes:

Optical network unit ONU, the data stream sent for obtaining described OLT each CNU at least one CNU described will arrive Mean Speed or the data volume of described CMC, and the signal to noise ratio snr information that each CNU described of reception each CNU described transmission is on each subcarrier in the next cycle of current period；

Copper wire terminal CLT, described data stream for obtaining according to described ONU will arrive Mean Speed or the data volume of described CMC in the next cycle of current period, and each CNU described signal to noise ratio snr information on each subcarrier is respectively the data flow point sub-carriers that described OLT sends to each CNU described.

Coaxial medium transducer the most according to claim 7, it is characterised in that described ONU, including:

Memorizer, for recording remaining data amount or the bandwidth of excess distribution of caching in described CMC within each cycle；

Receptor, is used for each CNU described receiving described each CNU transmission signal to noise ratio snr information on each subcarrier；

Processor, will arrive Mean Speed or the data volume of described CMC in the next cycle according to current period described in the remaining data amount of caching in the described CMC in each cycle described or the bandwidth calculation of excess distribution.

Coaxial medium transducer the most according to claim 8, it is characterised in that described ONU is additionally operable to:

The data stream sent by the described OLT received each CNU at least one CNU described is divided into transmission flow data and other data in addition to described transmission flow data according to type of service；Accordingly,

Described memorizer is additionally operable to, and the transmission flow data obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period；

Described processor is additionally operable to: will arrive Mean Speed or the data volume of described CMC in the next cycle of current period according to described transmission flow data, and each CNU described SNR information on each subcarrier is respectively each described transmission flow data distribution subcarrier.

Coaxial medium transducer the most according to claim 9, it is characterized in that, described CLT is additionally operable to: will arrive the Mean Speed of described CMC in the next cycle of current period according to transmission flow data each described or data volume calculates the waiting time of each transmission first bag of flow data of caching in described CMC, and the waiting time and each CNU described signal to noise ratio snr information on each subcarrier according to each transmission first bag of flow data described is respectively each transmission flow data distribution subcarrier.

11. coaxial medium transducers according to claim 10, it is characterised in that described CLT is additionally operable to:

The length of the waiting time according to each transmission first bag of flow data described obtains the first sequence of described transmission flow data；

Transmit the priority of flow data according in described first sequence, be followed successively by described transmission flow data distribution subcarrier according to CNU corresponding to described transmission flow data SNR information on each subcarrier.

12. coaxial medium transducers according to claim 11, it is characterised in that described CLT is additionally operable to:

After each transmission flow data described divides equally sub-carriers, if also having the residue unallocated described transmission flow data of subcarrier, then use each other data priority on described residue subcarrier described in the length computation of queue according to each other data described；

On described residue subcarrier, other data described are distributed according to each other data described priority on described residue subcarrier.

13. 1 sub-carrier distribution systems, it is applied to based on coaxial Ethernet passive optical network EPOC, including: optical line terminal OLT, coaxial medium transducer CMC and at least one coaxial network unit CNU, described OLT is connected by optical fiber with described CMC, described CMC is connected by coaxial cable with at least one CNU described, it is characterized in that, described CMC is used for: the data stream obtaining the described OLT each CNU transmission at least one CNU described will arrive Mean Speed or the data volume of described CMC in the next cycle of current period；Each CNU described that each CNU described in receiving sends signal to noise ratio snr information on each subcarrier；Mean Speed or the data volume of described CMC will be arrived according to described data stream in the next cycle of current period, and each CNU described signal to noise ratio snr information on each subcarrier will be respectively the data flow point sub-carriers that described OLT sends to each CNU described.