CN104935529A - OFDMA-PON dynamic bandwidth allocation method - Google Patents

OFDMA-PON dynamic bandwidth allocation method Download PDF

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Publication number
CN104935529A
CN104935529A CN201510247084.3A CN201510247084A CN104935529A CN 104935529 A CN104935529 A CN 104935529A CN 201510247084 A CN201510247084 A CN 201510247084A CN 104935529 A CN104935529 A CN 104935529A
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Prior art keywords
bandwidth
onu
queue
ofdma
frame
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Inventor
谭澍
周权
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BEIJING BLUE MOUNTAINS TECHNOLOGY Co Ltd
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BEIJING BLUE MOUNTAINS TECHNOLOGY Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/50—Queue scheduling
    • H04L47/52—Queue scheduling by attributing bandwidth to queues
    • H04L47/522—Dynamic queue service slot or variable bandwidth allocation
    • H04L47/524—Queue skipping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/50—Queue scheduling
    • H04L47/52—Queue scheduling by attributing bandwidth to queues
    • H04L47/525—Queue scheduling by attributing bandwidth to queues by redistribution of residual bandwidth
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/80—Actions related to the user profile or the type of traffic
    • H04L47/805—QOS or priority aware
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)

Abstract

The invention discloses an OFDMA-PON dynamic bandwidth allocation method, and belongs to the passive optical network system technical field; the OFDMA-PON dynamic bandwidth allocation method improves a frame structure of a GPON system transmission distribution layer and a dynamic bandwidth allocation realization method, is simple in device, strong in robustness, can realize adaptive dynamic distribution of a bottom MAC protocol bandwidth in the GPON system, thus providing strong engineering application value.

Description

A kind of OFDMA-PON distribution method of dynamic bandwidth
Technical field
The invention belongs to passive optical network technical field, be specifically related to a kind of OFDMA-PON distribution method of dynamic bandwidth.
Background technology
The formulation of GP0N standard and proposition, indicate to all optical network is advanced in years again and go a step further.By GP0N system, both can transmit ATM (high-speed packet switching technology) cell, also can transmit packet-based cell flow.GP0N is devoted to provide higher data transmission efficiency and business service grade (QoS), and these are all effectively support that multimedia service is necessary.ITU international telecommunication union recommendation specify that the basic demand of physical medium layer and transmission convergence layer, is that this suggestion specify that the frame format of information flow, the arrangement of overhead byte and physical layer maintain the distribution of cell with the maximally related part of MAC protocol.But regulation is not made for the bandwidth allocation methods of most critical in MAC protocol, therefore to the research of MAC protocol bandwidth allocation algorithm, there is realistic meaning.
In packet network, because the requirement of miscellaneous service to quality of service is not quite similar, some types of service are to time delay very sensitive (as speech), have then only to cell loss ratio sensitivity (as FTP or e-mail), if different kinds of business is not treated with making any distinction between, the deterioration of QoS can be caused, even can cause cell loss concealment.The fairness of gigabit passive optical network (GPON) allocated bandwidth reduces the transmission delay of network, and improves bandwidth availability ratio.In GPON system, effectively can realize the device and method of bottom MAC protocol allocated bandwidth, become a kind of new technical need.
For above shortcoming, the present invention improves on the frame structure of GPON system transfers convergence-level and the implementation method of Dynamic Bandwidth Allocation, proposes a kind of OFDMA-PON distribution method of dynamic bandwidth.Apparatus of the present invention are simple, and strong robustness, can carry out self adaptation dynamic assignment to the bandwidth of bottom MAC protocol in GPON system, have stronger engineer applied and are worth.
Summary of the invention
In order to solve prior art Problems existing, the invention provides a kind of OFDMA-PON distribution method of dynamic bandwidth.
According to an aspect of the present invention, provide a kind of OFDMA-PON distribution method of dynamic bandwidth, described device comprises bandwidth request unit, bandwidth management unit and bandwidth performance element.
Preferably, described bandwidth request unit, according to unification of three nets demand, forms ONU bandwidth demand matrix R.
Further, in described bandwidth request unit, unification of three nets comprises telecommunications network, broadcasting and television network and the Internet.
Further, described bandwidth demand matrix R take Frame as statistical unit basic time, is byte number or the cell number in units of 53 bytes by the length transition of individual queue in ONU, forms bandwidth demand matrix R.
Preferably, described ONU is optical network unit, comprises A, B, C, D tetra-class hierarchy business, the element R in described bandwidth demand matrix R i, j(1≤i≤N, 1≤j≤4) are ONU ia middle jth queue cumulative bandwidth demand, N represents the statistical value of optical network unit, and N is positive integer, and the maximum of N is 128.
Further, in described A, B, C, D tetra-class hierarchy business, determine the priority orders of individual queue poll according to the height of individual queue business to requirement of real-time, arrange from high to low, be followed successively by A grade business, B grade business, C grade business and D grade business.
Preferably, described bandwidth management unit carries out Dynamic Bandwidth Allocation according to R matrix.
Further, Dynamic Bandwidth Allocation in described bandwidth management unit, fixes the transmission mandate of queue in each Frame, is W j(1≤j≤4), wherein meet take Frame as statistical unit basic time, distributed bandwidth total in system is converted to byte number or the cell number M in units of 53 bytes.
Further, described cell number M can distribute to ONU ibandwidth conversion be byte number or the cell number in units of 53 bytes, meet oNU will be can be ithe bandwidth conversion of each queue assignment be byte number or the cell number in units of 53 bytes, meet and distribute bandwidth allocation matrix further.
Further, described allocated bandwidth matrix is by ONU ithe permit bandwidth of each grade service queue is converted to byte number or the cell number G in units of 53 bytes i, j, form allocated bandwidth matrix, wherein, meet G i, j=min (R i, j, M i, j) (1≤i≤N, 1≤j≤4).
Preferably, described bandwidth performance element performs the transmission of the information such as final data, voice, video.
According to another aspect of the present invention, provide a kind of distribution method of dynamic bandwidth based on GPON system, described method comprises the steps:
Step S1: the distributed bandwidth that estimating system is total in the 1st frame time of allocated bandwidth time is M, MAC protocol controller polling bandwidth requirement matrix R, bandwidth demand total in 1 frame time is Q = Σ i = 1 N Σ j = 1 4 R i , j ;
Step S2: according to ONU iload be calculated as the bandwidth M that it distributes i=(Q '/Q) M;
Step S3: according to business weights and step S2, can distribute to ONU ithe bandwidth of each service queue M i , j = ( W j / Σ j = 1 4 W j ) M i ;
Step S4: the result calculated according to result and the step S3 of step S2 poll is ONU iservice queue distribute bandwidth;
Step S5: for all ONU comprising bandwidth request distribute bandwidth;
Step S6: upgrade bandwidth demand matrix, calculates remaining bandwidth and judge whether to get back to step S1;
Step S7: upgrade bandwidth demand matrix R, waits for the distribution of next frame.
Preferably, in described step S3, described business weights are the transmission mandate weights W of data frame queue in claim 5 j(1≤j≤4).
Optionally, in described step S4, ONU ithe bandwidth of distributing in service queue is divided into following four kinds of situations:
If R i, 1> 0 is ONU ia service distribute bandwidth, and computation bandwidth residue:
G i，1＝min(R i，1，M i，1)
M i＝M i-G i，1
If R i, 2> 0 is ONU ib service distribute bandwidth, and computation bandwidth residue:
G i，2＝min(R i，2，M i，2)
M i＝M i-G i，2
If R i, 3> 0 is ONU ic service distribute bandwidth, and computation bandwidth residue:
G i，3＝min(R i，3，M i，3)
M i＝M i-G i，3
If R i, 4> 0 is ONU id service distribute bandwidth, and computation bandwidth residue:
G i，4＝min(R i，4，M i，4)
M i＝M i-G i，4
Preferably, in described step S6, after initial bandwidth authorized appropriation, under the prerequisite occurring remaining bandwidth, now do not send in the queue of license and there will be accumulation cell, in order to improve bandwidth availability ratio, need, according to step S1 to S5 in claim 8, again to process remaining upstream bandwidth.
The dynamic bandwidth allocation apparatus based on GPON system that the present invention proposes and method, can produce positive beneficial effect, have the advantage of following three aspects:
(1) device is simple, and strong robustness, can carry out self adaptation dynamic assignment to the bandwidth of bottom MAC protocol in GPON system, has stronger engineer applied and is worth.
(2) Bandwidth map manager realizes logic function by algorithm realization, completes the dynamic assignment of bandwidth, and with low cost, method is efficient.
(3) for the grouping management of cell flow, maintenance and robustness, the method that the present invention proposes is very effective.
Accompanying drawing explanation
Fig. 1 shows the composition structural representation of GPON system in prior art;
Fig. 2 shows GPON system MAC uplink frame transmission frame-form schematic diagram in prior art;
Fig. 3 shows GPON system MAC downlink frame transmission frame-form schematic diagram in prior art;
Fig. 4 shows grouped data transmission frame-form schematic diagram in GPON system of the preferred embodiment of the present invention;
Fig. 5 shows the dynamic bandwidth allocation apparatus schematic diagram based on GPON system of the preferred embodiment of the present invention;
Fig. 6 shows the mac controller structure based on GPON system of the preferred embodiment of the present invention;
Fig. 7 shows the distribution method of dynamic bandwidth schematic diagram based on GPON system of the preferred embodiment of the present invention;
Fig. 8 shows the distribution method of dynamic bandwidth flow chart based on GPON system of the preferred embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, below in conjunction with embodiment also with reference to accompanying drawing, the present invention is described in more detail.Should be appreciated that, these describe just exemplary, and do not really want to limit the scope of the invention.In addition, in the following description, the description to known features and technology is eliminated, to avoid unnecessarily obscuring concept of the present invention.
Fig. 1 shows the composition structural representation of GPON system in prior art.
As shown in Figure 1, topmost three parts of GPON system comprise OLT (the Optical Line Terminal being positioned at local side, optical line terminal), terminal ONU (Optical NetworkUnit, optical network unit) and ODN (Optical Distribution Network, optical distribution)." passive " in PON and EPON refers to that ODN is all made up of passive devices such as optical branching devices, not containing any electronic device and power supply, is specifically introduced below to OLT, ODN and ONU function.
OLT provides the interface between network side and core net for Access Network, is connected with each ONU by ODN.In Fig. 1, OLT is communicated with Internet the Internet, PSTN PSTN, CATV community communal TV aerial, as the Core Feature equipment of PON system, OLT has concentrated allocated bandwidth, controls each ONU, the function of monitoring, operation maintenance management PON system in real time.ONU provides the interface of user side for Access Network, provides the access of the multi-business flows such as speech, data, video and ODN, simultaneously by OLT centralized control.The branching ratio of system support is 1: 16/32/64, and along with the development evolution of optical transceiver module, the branching ratio of support will reach 1: 128.Over the same fiber, GPON can use wavelength division multiplexing (WDM) technology to realize the transmitted in both directions of signal.According to actual needs, corresponding PON operator guards can also be adopted on the basis of traditional tree topology to improve the survivability of network.GPON technology is the latest generation broadband passive light Integrated access standard based on ITU-TG.984.x standard, has high bandwidth, high efficiency, large coverage, and user interface is abundant waits many merits.
Fig. 2 shows GPON system MAC uplink frame transmission frame-form schematic diagram in prior art, and Fig. 3 shows GPON system MAC downlink frame transmission frame-form schematic diagram in prior art.
As shown in Figures 2 and 3, in packet network, because the requirement of miscellaneous service to quality of service is not quite similar, some types of service are to time delay very sensitive (as speech), have then only to cell loss ratio sensitivity (as FTP e-mail), if do not treated with making any distinction between by different kinds of business, the deterioration of QoS can be caused, even can cause cell loss concealment.5 class Business Streams of access GPON system are divided into 4 classes by it to the difference of requirement of real-time: A service, b service, c service and d service, adopt different Bandwidth sharing mechanisms to dissimilar business.According to principle service with different priority levels being provided to different QoS, take the method for the grade of service being classified at network edge, namely in ONUs side, business by identical qos requirement is formed a queue, the service queue of each grade is buffered in a queue buffer, therefore in ONUs side, each ONU needs to arrange 4 queue buffer, the filling situation of buffer reflects the temporal properties of business, this information is sent to media access control (mac controller) by the customizing messages byte of uplink frame, such mac controller just can understand the load condition of whole system.
The up-downgoing frame length of GPON system transfers frame is 125 microseconds, in Fig. 1, in frame structure, PLOu, PLOAMu, PLSu and PCBu are uplink frame expense, the length of DBA (dynamicbandwidth allocation) Dynamic Bandwidth Allocation is 12bit, ONU utilizes DBA to be reported to OLT by the queuing message in its queue buffer, with bandwidth application resource, and the format and content of DBA is not defined in ITU international telecommunication union recommendation.In the present invention, DBA is divided into the BWRF of Frag and 10bit of 2 part: 2bit, bandwidth request region Frag represents the grade of service queue in the queue buffer of ONUs side, and wherein, in 00 expression queue, buffer memory is category-A, and priority is 1; 01 what represent buffer memory in queue is b service, and priority is that 2,10 what represent buffer memory in queues is c service, and priority is that 3,11 what represent buffer memory in queues is d service, and priority is 4.BWRF is long is 10bit, and represent the length of service queue in queue buffer, the every frame of ONUs can report the wait situation of 0 ~ 1024 cell or the Business Stream in units of 53byte to OLT.The queue grade of service that OLT reports according to ONUs and system resource are that ONUs distributes bandwidth.The front 4bit of last byte of PCBu is as healthy and strong controlled area, and 3 set bit and trough, 1bit reserves, and for increasing robustness and the upgradability of GPON system, last 4bit is used for CRC check, completes the protection to solicited message.GPON system descending frame transmission frame-form in Fig. 3, mac controller utilizes the US BW map in downlink frame to distribute bandwidth for ONUs.Both can transmit ATM cell by GPON system, also can transmit packet-based cell flow.
Fig. 4 shows grouped data transmission frame-form schematic diagram in GPON system of the preferred embodiment of the present invention.
As shown in Figure 4, the data load part that GPON transmits frame is made up of m packet frames, each packet frames has the frame head of 5byte, thereafter be adjustable length load data, its length is by the block length indicator symbol of 2byte, and each packet frames can transmit 0*65536 cell or the Business Stream in units of 53byte.Have the Frag of 2bit in frame head, 00 for grouped data be the whole of packet frames, 01 for grouped data be the 1st section of packet frames, 10 for grouped data be the final stage of packet frames, 11 for grouped data be the mid portion of packet frames.Each packet frames is terminated by end mark of dividing into groups, and to grouping cell flow, each packet frames has the expense of 21byte.
Fig. 5 shows the dynamic bandwidth allocation apparatus schematic diagram based on GPON system of the preferred embodiment of the present invention.
As shown in Figure 5, the dynamic bandwidth allocation apparatus based on GPON system comprises bandwidth request unit, bandwidth management unit and bandwidth performance element.
Bandwidth request unit, according to unification of three nets demand, forms ONU bandwidth demand matrix R.Wherein, in bandwidth request unit, unification of three nets comprises telecommunications network, broadcasting and television network and the Internet.Bandwidth demand matrix R take Frame as statistical unit basic time, is byte number or the cell number in units of 53 bytes by the length transition of individual queue in ONU, forms bandwidth demand matrix R.Wherein, ONU is optical network unit, comprises A, B, C, D tetra-class hierarchy business, the element R in bandwidth demand matrix R i, j(1≤i≤N, 1≤j≤4) are ONU ia middle jth queue cumulative bandwidth demand, N represents the statistical value of optical network unit, and N is positive integer, and the maximum of N is 128.Wherein, A, B, C, D tetra-in class hierarchy business, determines the priority orders of individual queue poll, arranges from high to low, be followed successively by A grade business, B grade business, C grade business and D grade business according to the height of individual queue business to requirement of real-time.
Bandwidth management unit carries out Dynamic Bandwidth Allocation according to R matrix.Dynamic Bandwidth Allocation in bandwidth management unit, fixes the transmission mandate of queue in each Frame, is W j(1≤j≤4), wherein meet take Frame as statistical unit basic time, distributed bandwidth total in system is converted to byte number or the cell number M in units of 53 bytes.Cell number M can distribute to ONU ibandwidth conversion be byte number or the cell number in units of 53 bytes, meet oNU will be can be ithe bandwidth conversion of each queue assignment be byte number or the cell number in units of 53 bytes, meet and distribute bandwidth allocation matrix further.Allocated bandwidth matrix is by ONU ithe permit bandwidth of each grade service queue is converted to byte number or the cell number G in units of 53 bytes i, j, form allocated bandwidth matrix, wherein, meet G i, j=min (R i, j, M i, j) (1≤i≤N, 1≤j≤4).
Bandwidth performance element performs the transmission of the information such as final data, voice, video.
Fig. 6 shows the mac controller structure based on GPON system of the preferred embodiment of the present invention.
As shown in Figure 6, in the preferred embodiment of the present invention, the ONUs that GPON system can manage is N number of (maximum of N is 128), the mac controller structure being positioned at OLT of the present invention's design as shown in Figure 6, determined by bandwidth allocation algorithm by the service parameter wherein preserving all grade Business Streams in bandwidth allocation parameters.Bandwidth request matrix R receives the DBA report information that OUNs sends, it is the storage matrix of N × 4, the often queue buffer quene state of the corresponding ONU of row, 4 row A, B, C of corresponding ONU and queue situation of d service respectively of matrix, its length is respectively 2 bytes.The logic function of BW map of the present invention (Bandwidth map manager), by algorithm realization, completes the dynamic assignment of bandwidth.Allocated bandwidth result is delivered to BW map (fifo register) by BW map manager, BW map has H memory cell, H is determined by the hardware of system, each memory cell is 6 byte, its effect is the BW map generating next frame, mac controller utilizes the US BW map (upstream bandwidth map section) of downlink frame, sends it to each ONUs by the mode of broadcast.
Fig. 7 shows the distribution method of dynamic bandwidth schematic diagram based on GPON system of the preferred embodiment of the present invention.
As shown in Figure 7, bandwidth demand matrix R take Frame as statistical unit basic time, be byte number or the cell number in units of 53 bytes by the length transition of individual queue in ONU, form bandwidth demand matrix R, it is the matrix of capable 4 row of N, N is the quantity of system ONU, and ONU comprises A, B, C, D tetra-class hierarchy business, the element R in bandwidth demand matrix R i, j(1≤i≤N, 1≤j≤4) are ONU ia middle jth queue cumulative bandwidth demand, N represents the statistical value of optical network unit, and N is positive integer, and the maximum of N is 128.A, B, C, D tetra-class hierarchy business determine according to the height of individual queue business to requirement of real-time the priority orders of individual queue poll to arrange, be followed successively by A grade business, B grade business, C grade business and D grade business from high to low.The weight of distributing bandwidth in each grade business is fixed according to the transmission mandate of queue in each Frame, is W j(1≤j≤4), and meet take Frame as statistical unit basic time, distributed bandwidth total in system is converted to byte number or the cell number M in units of 53 bytes.Wherein, cell number M can distribute to ONU ibandwidth conversion be byte number or the cell number in units of 53 bytes, meet oNU will be can be ithe bandwidth conversion of each queue assignment be byte number or the cell number in units of 53 bytes, meet and distribute bandwidth allocation matrix further.Wherein, allocated bandwidth matrix is by ONU ithe permit bandwidth of each grade service queue is converted to byte number or the cell number G in units of 53 bytes i, j, form allocated bandwidth matrix, and meet G i, j=min (R i, j, M i, j) (1≤i≤N, 1≤j≤4), after distributing bandwidth demand matrix, allocated bandwidth matrix, carry out downlink frame allocated bandwidth.
Fig. 8 shows the distribution method of dynamic bandwidth flow chart based on GPON system of the preferred embodiment of the present invention, and the method specifically comprises the steps:
Step S1: the distributed bandwidth that estimating system is total in the 1st frame time of allocated bandwidth time is M, MAC protocol controller polling bandwidth requirement matrix R, bandwidth demand total in 1 frame time is Q = Σ i = 1 N Σ j = 1 4 R i , j ;
Step S2: according to ONU iload be calculated as the bandwidth M that it distributes i=(Q '/Q) M;
Step S3: according to business weights and step S2, can distribute to ONU ithe bandwidth of each service queue wherein business weights are the transmission mandate weights W of data frame queue j(1≤j≤4);
Step S4: the result calculated according to result and the step S3 of step S2 poll is ONU iservice queue distribute bandwidth, ONU ithe bandwidth of distributing in service queue is specifically divided into following four kinds of situations:
If R i, 1> 0 is ONU ia service distribute bandwidth, and computation bandwidth residue:
G i，1＝min(R i，1，M i，1)
M i＝M i-G i，1
If R i, 2> 0 is ONU ib service distribute bandwidth, and computation bandwidth residue:
G i，2＝min(R i，2，M i，2)
M i＝M i-G i，2
If R i, 3> 0 is ONU ic service distribute bandwidth, and computation bandwidth residue:
G i，3＝min(R i，3，M i，3)
M i＝M i-G i，3
If R i, 4> 0 is ONU id service distribute bandwidth, and computation bandwidth residue:
G i，4＝min(R i，4，M i，4)
M i＝M i-G i，4
Step S5: for all ONU comprising bandwidth request distribute bandwidth;
Step S6: upgrade bandwidth demand matrix, calculates remaining bandwidth and judge whether to get back to step S1;
Step S7: upgrade bandwidth demand matrix R, waits for the distribution of next frame.
Should be understood that, above-mentioned embodiment of the present invention only for exemplary illustration or explain principle of the present invention, and is not construed as limiting the invention.Therefore, any amendment made when without departing from the spirit and scope of the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.In addition, claims of the present invention be intended to contain fall into claims scope and border or this scope and border equivalents in whole change and modification.

Claims (3)

1. an OFDMA-PON distribution method of dynamic bandwidth, is characterized in that, said method comprising the steps of:
Step S1: the distributed bandwidth that estimating system is total in the 1st frame time of allocated bandwidth time is M, MAC protocol controller polling bandwidth requirement matrix R, bandwidth demand total in 1 frame time is Q = Σ i = 1 N Σ j = 1 4 R i , j ;
Step S2: according to ONU iload be calculated as the bandwidth M that it distributes i=(Q '/Q) M;
Step S3: according to business weights and step S2, can distribute to ONU ithe bandwidth of each service queue M i , j = ( W j / Σ j = 1 4 W j ) M i ;
Step S4: the result calculated according to result and the step S3 of step S2 poll is ONU iservice queue distribute bandwidth;
Step S5: for all ONU comprising bandwidth request distribute bandwidth;
Step S6: upgrade bandwidth demand matrix, calculates remaining bandwidth and judge whether to get back to step S1;
Step S7: upgrade bandwidth demand matrix R, waits for the distribution of next frame.
2. OFDMA-PON distribution method of dynamic bandwidth according to claim 1, is characterized in that:
In described step S3, described business weights are the transmission mandate weights W of data frame queue in claim 5 j(1≤j≤4).
3. OFDMA-PON distribution method of dynamic bandwidth according to claim 1, is characterized in that:
In described step S6, after initial bandwidth authorized appropriation, under the prerequisite occurring remaining bandwidth, now do not send in the queue of license and there will be accumulation cell, in order to improve bandwidth availability ratio, need, according to step S1 to S5 in claim 8, again to process remaining upstream bandwidth.
CN201510247084.3A 2015-05-13 2015-05-13 OFDMA-PON dynamic bandwidth allocation method Pending CN104935529A (en)

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Publication number Priority date Publication date Assignee Title
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Application publication date: 20150923