CN104919759A - Method, apparatus and system for allocating uplink bandwidth in passive optical network - Google Patents

Method, apparatus and system for allocating uplink bandwidth in passive optical network Download PDF

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Publication number
CN104919759A
CN104919759A CN201380002382.5A CN201380002382A CN104919759A CN 104919759 A CN104919759 A CN 104919759A CN 201380002382 A CN201380002382 A CN 201380002382A CN 104919759 A CN104919759 A CN 104919759A
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bwmap
bandwidth
eqd
response times
starttime
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CN104919759B (en
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赵望生
梁选勤
万席锋
郑刚
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0064—Arbitration, scheduling or medium access control aspects

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Small-Scale Networks (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Disclosed is a method for allocating a bandwidth in a passive optical network, which is characterized in that the method comprises: an ONU receiving multiple downlink frames from an OLT, wherein each of the downlink frames carries a Bandwidth map (BWmap), the BWmap comprises N subfields for allocating bandwidths for N TCs, and N is an integer greater than 512; the ONU parsing the BWmap, and obtaining the bandwidths allocated to the TCs of the ONU; and the ONU sending uplink data based on the obtained bandwidths of the TCs. According to a preceding technical scheme, a number of bandwidths allocated to each frame can be expanded from 512 to 2047, significantly reducing an allocation period, and reducing a requirement on a buffer of the ONU.

Description

METHOD, APPARATUS AND SYSTEM FOR ALLOCATING UPLINK BANDWIDTH IN PASSIVE OPTICAL NETWORK
The method of passive optic network up bandwidth distribution, apparatus and system
Technical field
The present invention relates to method, the apparatus and system of the bandwidth allocation techniques of technical field of network communication, more particularly to a kind of distribution of uplink bandwidth in passive optical network.
Background technology
Gigabit passive optical network (Gigabit Passive Optical Network, GPON) is one point-to-multipoint（Point to Mutil-Point, P2MP system), one optical line terminal (Optical Line Terminal, OLT) port can connect many optical network units by Optical Distribution Network (Optical Distribution Network, ODN)（Optical Network Unit, ONU) equipment.ODN is made up of Passive Optical Components such as single-mode fiber, optical branching device, optical connectors, and light-transmitting medium is provided for the physical connection between 0LT and 0NU.
Up direction in GP0N systems, multiple 0NU need to send uplink optical signal, and 0LT in downlink frame by carrying bandwidth allocation bitmap（BandWidth map, BWmap) specify each ONU to send the time slot of uplink optical signal.0NU is received after the BWmap that 0LT is issued, and parses BWmap, luminous in specified time slot.To improve bandwidth availability ratio, 0LT needs the upstream bandwidth according to each 0NU of actual flow dynamically distributes, issues BWmap per frame, and issue a frame every 125 μ s.
Because a 0NU can carry a variety of TDM services, and time delay is less than 1. 5ms end to end for TDM service requirement.Each 0NU supports multiple transmission containers, and (Transmission Container, TO, the TC that the ONU is supported are more, then OLT is bigger to the BWmap that the ONU is distributed, and the time for parsing BWmap is longer.
In the prior art, when under 0LT ports TC numbers more than 512, it is necessary to multiframe complete One wheel bandwidth allocation.Because now OLT needs to issue the wheel bandwidth allocation of multiframe completion one, the TDM service time delay increase for causing 0NU to be carried, beyond 1. 5ms delay requirement.
The content of the invention
In view of this, the embodiment of the present invention provides a kind of method of passive optic network up bandwidth distribution, apparatus and system, significantly shorten assignment period, reduces the requirement cached to 0NU.
First aspect, the embodiment of the present invention provides a kind of bandwidth allocation methods, the method of the bandwidth allocation is applied in passive optical network, the system includes optical line terminal 0LT and at least one optical network unit 0NU, any one optical network unit 0LT supports multiple transmission container TC, methods described includes the ONU and receives multiple downlink frames from the OLT, each downlink frame carries bandwidth allocation bitmap BWmap, the BWmap includes distributing N number of subfield of bandwidth for N number of TC, wherein, N is the integer more than 512；The 0NU parses the BWmap, obtains the bandwidth for the TC for distributing to the ONU；The 0NU sends upstream data according to the TC of acquisition bandwidth.
In the first possible implementation of first aspect, methods described Jin mono- Walk parse the BWmap including the 0NU using the 0NU response times, wherein, the 0NU response times are more than 36 us, and the 0NU response times are used to identify the 0NU circuit delay times.
In second of possible implementation of first aspect, the 0NU response times are the 0NU response times that the 0NU is handed down to by the 0LT；Or, the 0NU response times are the 0NU response times of the 0NU itself configurations.
In the third possible implementation of first aspect, the 0NU response times are numbers of the 0LT according to the TC connected under port, or the BWmap can be carried In the 4th kind of possible implementation of first aspect, the 0NU parsings are described
BWmap Jin mono- Walk include the 0NU and parse the BWmap according to equivalent delay time EQD, wherein, the EQD is that the 0LT is handed down to the 0NU, the EQD is used for the distance for identifying 0LT ports distance and the 0NU, and the EQD is one times or multiple integral multiples of 125 microseconds.
In the 5th kind of possible implementation of first aspect, the 0NU parsings are described
BWmap, Jin mono- Walk include the 0NU and parse the BWmap according to bandwidth initial time StartTime, wherein, the StartTime is that the 0LT is handed down to the 0NU, described
StartTime is used to identify position of the luminous time slot for distributing to the TC in the BWmap, and the StartTime is one times or multiple integral multiples of 125 microseconds.
Second aspect, the embodiment of the present invention also provides a kind of bandwidth allocation methods, the method of the bandwidth allocation is applied in passive optical network P0N, the system P0N includes optical line terminal 0LT and at least one optical network unit 0NU, any one optical network unit 0LT supports multiple transmission container TC, receives the upstream data that the 0NU is sent according to the bandwidth for parsing the TC that the BWmap is obtained.Methods described includes the optical line terminal 0TL and sends carrying bandwidth allocation bitmap BWmap in multiple downlink frames, each downlink frame, and the BWmap includes distributing N number of subfield of bandwidth for N number of TC, wherein, N is the integer more than 512.
In the first possible implementation of second aspect, the 0LT issues the 0NU response times to the 0NU, wherein, the 0NU response times are used for the 0NU parsing BWmap, and the 0NU response times are used for the circuit delay time for identifying the 0NU.
In second of possible implementation of second aspect, the 0NU response times are The OLT is according to the TC connected under port number, or the BWmap maximum TC numbers that can carry are calculated.
In the third possible implementation of second aspect, methods described also issues equivalent delay time EQD to the 0NU including the 0LT, wherein, the EQD is used for the 0NU and parses the BWmap, the EQD is used for the distance for identifying OLT ports distance and the ONU, and the EQD is one times or multiple integral multiples of 125 microseconds.
In the 4th kind of possible implementation of second aspect, methods described also issues bandwidth initial time StartTime to the 0NU including the 0LT, wherein, the StartTime is used for the 0NU and parses the BWmap, the StartTime is used to identify position of the luminous time slot for distributing to the TC in the BWmap, and the StartTime is one times or multiple integral multiples of 125 microseconds.
The third aspect, a kind of optical network unit, including receiving unit, for receiving multiple downlink frames from 0LT, each downlink frame carries bandwidth allocation bitmap BWmap, the BWmap includes distributing N number of subfield of bandwidth for N number of TC, wherein, N is the integer more than 512；Resolution unit, for parsing the BWmap, obtains the bandwidth for the TC for distributing to the ONU；Transmitting element, the bandwidth for the TC according to acquisition sends upstream data.
In the first possible implementation of the third aspect, the resolution unit is used to parse the BWmap, the bandwidth Jin mono- Walk for obtaining the TC for distributing to the ONU parse the BWmap including the 0NU using the 0NU response times, wherein, the 0NU response times are more than 36 us, and the ONU response times are used to identify the ONU circuit delay times. In second of possible implementation of the third aspect, the 0NU responses are the 0NU response times that the 0NU is handed down to by the 0LT；Or, the 0NU response times are the 0NU response times of the 0NU itself configurations.
In the third possible implementation of the third aspect, the 0NU response times are numbers of the 0LT according to the TC connected under port, or the BWmap maximum transmission container numbers that can carry are calculated.
In the 4th kind of possible implementation of the third aspect, the resolution unit is used to parse the BWmap, obtaining the bandwidth Jin mono- Walk for the TC for distributing to the ONU includes the 0NU according to the equivalent delay time EQD parsings BWmap, wherein, the EQD is that the 0LT is handed down to the 0NU, and the EQD is used to identify one times or the multiple integral multiples that EQD described in 0LT ports distance and the 0NU distance is 125 microseconds.
In the 5th kind of possible implementation of the third aspect, the resolution unit is used to parse the BWmap, obtains the bandwidth for the TC for distributing to the ONU, and Jin mono- Walk include the 0NU and parse the BWmap according to bandwidth initial time StartTime, wherein, it is described
StartTime is that the 0LT is handed down to the 0NU, and the StartTime is used to identify one times or multiple integral multiples of the StartTime described in position of the luminous time slot for distributing to the TC in the BWmap for 125 microseconds.
A kind of fourth aspect, optical line terminal, the 0LT includes transmitting element, the N number of subfield of bandwidth allocation bitmap BWmap, the BWmap including distributing bandwidth for N number of TC is carried in multiple downlink frames, each downlink frame for sending, wherein, N is the integer more than 512；Receiving unit, for receiving the upstream data that the 0NU is sent according to the bandwidth for parsing the TC that the BWmap is obtained. In the first possible implementation of fourth aspect, transmitting element is additionally operable to issue the 0NU response times to the 0NU, wherein, the 0NU response times are used for the 0NU parsing BWmap, and the ONU response times are used for the circuit delay time for identifying the ONU.
In second of possible implementation of fourth aspect, the 0NU response times are numbers of the 0LT according to the TC connected under port, or the BWmap maximum TC numbers that can carry are calculated.
In the third possible implementation of fourth aspect, transmitting element is additionally operable to issue equivalent delay time EQD to the 0NU, the EQD is used for the 0NU and parses the BWmap, the EQD is used to identify the distance that the EQD is used to identify 0LT ports distance and the 0NU, and the EQD is one times or multiple integral multiples of 125 microseconds.
In the 4th kind of possible implementation of fourth aspect, transmitting element is additionally operable to issue bandwidth initial time StartTime to the 0NU, the StartTime is used for the 0NU and parses the BWmap, the StartTime is used to identify position of the luminous time slot for distributing to the TC in the BWmap, and the StartTime is one times or multiple integral multiples of 125 microseconds.
5th aspect, a kind of passive optical network, including the optical network unit such as the third aspect described in any one possible implementation and the optical line terminal such as fourth aspect described in any one possible implementation.
Pass through above technical scheme, the number that 0LT distributes bandwidth per frame can be expanded to 2047 from 512, significantly shorten assignment period, reduce the requirement cached to 0NU, and then the service delays such as the time division multiplexing that 0NU is carried are also reduced, improve user satisfaction.
Brief description of the drawings In order to illustrate more clearly of embodiments of the invention or technical scheme of the prior art, used accompanying drawing is briefly described when below will be to description background technology and embodiment.Apparently, described in accompanying drawings below is only a part of embodiment of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, other accompanying drawings or embodiment can also be obtained according to these accompanying drawings and description, and it is contemplated that covering all these derivative accompanying drawings or embodiment.
Fig. 1 be the embodiment of the present invention based on network architecture schematic diagram；
Fig. 2 is GTC frame structures schematic diagram provided in an embodiment of the present invention；
Fig. 3 is that 0LT provided in an embodiment of the present invention issues BWmap schematic diagrames；
Fig. 4 is 0NU parsings BWmap schematic diagrames provided in an embodiment of the present invention；
Fig. 5 is a kind of method flow schematic diagram of passive optic network up bandwidth distribution of the offer of the embodiment of the present invention；
Fig. 6 is 0NU authentication registrations schematic flow sheet provided in an embodiment of the present invention；
Fig. 7 is a kind of structural representation of optical network unit provided in an embodiment of the present invention；Fig. 8 is a kind of structural representation of optical line terminal provided in an embodiment of the present invention.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and Examples, Jin travelings Yi Walk of the present invention are described in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.Obviously, described embodiment is only a part of embodiment of the 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 the premise of creative work is not made belongs to the scope of protection of the invention. Fig. 1 is the GP0N optical-fiber network configuration diagrams that the embodiment of the present invention is based on.In Fig. 1 GP0N optical network systems PON (Passive Optical Network, EPON）In, multiple ONT Optical Network Terminals（Optical Network Terminal, 0NT) or optical network unit
(Optical Network Unit, ONU), passes through optical distributed network（Optical Distribution Network, ODN) it is connected to optical line terminal（Optical Line Terminal , 0LT).OLT provides Network Side Interface for PON system, connects one or more 0DN.ODN is passive light point device, and the descending data branches of 0LT are transferred into each 0NU, 0LT is transferred to while multiple 0NU/0NT upstream data is collected.ONU provides user side interface for PON system, up to be connected with 0DN, if 0NU directly provides User Port Function, such as PC (Personal Computer, personal computer）The ethernet user port of online, then referred to as 0NT, the 0NU systems being mentioned below refer to 0NU and 0NT.
ONU to OLT uplink is by the way of multipoint-to-point, and 0LT to 0NU downlink transfer is by the way of point-to-multipoint.TCXTransmission Container shown in Fig. 1, transmit container）1, TC2, TC3 etc. represent the transmission container that GP0N systems are defined, and each 0NU can be allocated one or more TCs with output data, wherein, different service types are transferred to 0LT by different TC.
In GP0N systems, down direction（By 0LT to 0NU directions）Data transfer use broadcast mode, each 0NU receives all downlink frames respectively, further according to 0NU identify
(0NU_ID), gigabit passive optical network encapsulation method port-mark（GP0N Encapsulate Method portID, GEM-portID) or point tenth of the twelve Earthly Branches own mark
(Al location Identifier, Alloc-ID) obtains one's own frame.For up direction（The direction from 0NU to 0LT）Data transfer, due to each 0NU need it is shared Transmission medium, therefore each ONU passes through upstream bandwidth assignment bit map in OLT（Band-Width map, BWmap) transmission upstream data in the time slot of oneself is distributed to, wherein BWmap is carried in described downlink frame.
Wherein, described downlink frame can be GP0N Transmission Convergences（GPON Transmission Convergence, GTC) frame.The GTC frames include Tong Walk domains, superframe instructions field, Message Processing domain, bit interleaved parity code domain, descending payload length domain and bandwidth allocation bitmap and load.Alternatively, the embodiments described below can be applied in GP0N systems, can also be applied in ten gigabit passive optical networks (10-Gigabit-capable Passive Optical Network, XG-PON) system.Enter a Walk, the downlink frame of example below description can be the GTC frames, or XG-P0N Transmission Convergences（XG-PON transmission convergence, XGTC) frame.Wherein, as shown in Figure 2, described GTC frame structures are used to identify 0LT and authorize 0NU each type of service TC by the bandwidth allocation bitmap BWmap in downlink frame, between time started field and end time field are respectively used to identify at the beginning of the transmission uplink optical signal for the TC that ID is Al loc- ID and dwell time（In units of byte）.
Jin mono- Walk, as described in Figure 3, BWmap is made up of BWmap structure N number of distribution structure (Al location Structure), wherein, N is natural number.Each distribution structure is identified by bandwidth allocation（Al loc-ID), bandwidth initial time（Start Time), distribute bandwidth（Grant Size), wherein, Al loc-ID are used for the ID of identification transmission container (Transmission Container, T- C0NT);Broadband initial time Start Time are the character strings of 16 bit, for identifying position of the distribution time slot in this frame；Distribute bandwidth Grant Size is used to identify byte numbers of the bandwidth assignment bit map BWmap to the transmission container allocation.
All 0NU of 0LT connections are received after the downlink frame of the carrying BWmap, after each self-analytic data BWmap, and the time slot that each comfortable BWmap is specified sends up light.
According to standard G987. 3, as shown in figure 4,0NU includes from the time for receiving receipts BWmap to the up light of transmission：
First, the 0NU response time (ResponseTime, Rsptime), BWmap circuit time delay is received for identifying ONU, is 35 ± 1 s according to standard G987. 3 regulation;Second, the equivalent delay time (Equal ization Delay, EQD), may be 0 depending on the distance of OLT ports distance range and ONU;
3rd, bandwidth initial time（Start Time), may be 0 depending on position of the distribution time slot in this frame.
0NU needs to complete BWmap parsings within the above-mentioned time.We will combine specific inventive embodiments to describe in detail below.
Embodiment one
For convenience of introducing, the present invention is to optical line terminal abbreviation 0LT, to optical network unit abbreviation 0NU, and a kind of method of passive optic network up bandwidth distribution provided below embodiment of the present invention is described in detail, as shown in Figure 5.
S501,0LT send broadcasting packet to 0NU, and the broadcasting packet carries BWmap, wherein being that N number of TC distributes bandwidth per frame BWmap, N is the natural number more than 512, and 0NU receives the broadcasting packet of the carrying BWmap from 0LT.
Wherein, N maximum is 2047.
Jin mono- Walk, before S501 Walk are rapid, first, 0LT will reach the standard grade registered in 0NU Cheng Zhong, transmission broadcasting packet to 0NU, 0NU here reaches the standard grade registration process as shown in fig. 6, comprising 5 processes, specifically may refer to the standards of G987. 3 of IEEE formulations：
(1) 0NU is first in 01 state, and this state is preparing state；
(after 2) Tong Walk to downlink frame, into 02/03 state；
(3) 0LT periodically sends summary info（Profile Message), and periodic allocation sequence code SN reports bandwidth；There are the information such as delimiter, lead code in Profile Message；0NU is received after Profile Message, and SN is reported within the cycle for reporting sequence code SN;
(4) after 0LT receives the SN that 0NU is reported, 0NU, distribution 0NU mark 0NU- ID are found;0NU is received after 0NU-ID, into 04 state；
(5) 0LT distributes ranging bandwidth；0NU responds ranging message；0LT issues equivalent delay time EQD;0NU enters 05 state, completion of reaching the standard grade；
Described broadcasting packet can pass through physical layer operations and management message（Physical Layer Organization and Management, PL0AM) message transmission, it can be transmitted with a self-defined new message, the embodiment of the present invention is not limited to the message packet specifically used.
Jin mono- Walk, described broadcasting packet carries summary info（Profile Message), here summary info is as defined in the standards of G987. 3, 0NU needs to report 0LT parameter information during authentication registration, wherein, the 0NU response times (0NU Response time are carried in described summary info, RspTime), the response time can be 0LT according to the TC numbers connected under port, or the maximum TC numbers that BWmap can be carried, calculate the Response time needed for parsing BWmap, here maximum TC numbers are 2047, here calculating parsing is that 0LT is drawn according to the TC numbers measuring and calculating of actual connection, the 0NU responses of actual measuring and calculating The number range of time is 6 (T70us, the number range of the invention for not limiting the specific 0NU response times.
Wherein, RspTime is the 0NU response times, and N is actual TC number；Jin mono- Walk, specific Profile message structures can be as shown in table 1：The Profile message message contents of table 1
Calculate after the 0NU response times (Response time, RspTime), OLT is issued to 0LT by described broadcasting packet;
Then, 0LT issues bandwidth more than 512 TC per frame to 0NU by BWmap. S502, the ONU parses the BWmap, obtains the bandwidth for the transmission container for distributing to the ONU.
Wherein, provided according to standard G987. 3, the time of 0NU analytic messages there are three parts：The 0NU response times（ONU response time, RspTime), equivalent delay time (Equalization Delay, EQD), bandwidth initial time (Start Time).
During this Walk of are rapid, the 0NU response times that ONU is carried in the broadcasting packet according to reception parse BWmap, rather than 35 ± 1 s as defined in standard G987. 3;Equivalent delay time and bandwidth initial time are according to standard G987. 3 predetermined operation.
S503, the 0NU send upstream data according to the TC of acquisition bandwidth, and the 0LT receives the upstream data.
Pass through above technical scheme, the number of bandwidth is distributed per frame to be expanded to 2047 from 512, be significantly shorten assignment period, reduced the requirement cached to 0NU, and then the service delays such as the time division multiplexing that 0NU is carried are also reduced, improve user satisfaction.Embodiment two
The embodiment of the present invention additionally provides a kind of method of passive optic network up bandwidth distribution, and first, 0LT sends broadcasting packet to 0NU, and the broadcasting packet carries BWmap, wherein being that N number of TC distributes bandwidth per frame BWmap, N is the natural number more than 512；
Wherein, N maximum is 2047.
Described broadcasting packet can pass through physical layer operations and management message（Physical Layer Organization and Management, PLOAM) message transmission, it can be transmitted with a self-defined new message, the embodiment of the present invention is not limited to the Izvestia specifically used Text.
N number of transmission container total bandwidth size groups that second, 0NU are distributed according to the BWmap fill upstream data and sent to 0LT.
Wherein, the embodiment of the present invention is that 0NU does not use the 0NU response times as defined in existing standard G987. 3, but uses the 0NU response times of actual measuring and calculating, can parse the BWmap more than 512 TC.
Wherein, the 0NU response times of described actual measuring and calculating are 0LT according to the TC numbers connected under port, or the maximum TC numbers that BWmap can be carried, calculate the Response time needed for parsing BWmap, here maximum TC numbers are 2047, here calculating parsing is that 0LT is drawn according to the TC numbers measuring and calculating of actual connection, the number range of the 0NU response times of actual measuring and calculating is 6 (T70us, the number range of the invention for not limiting the specific 0NU response times.
Alternatively, equivalent delay time and bandwidth initial time are according to the predetermined operation of standard.By above technical scheme, the number of bandwidth is distributed per frame to be expanded to 2047 from 512, significantly shorten assignment period, reduce the requirement cached to 0NU.
Embodiment three
The embodiment of the present invention additionally provides a kind of passive optic network up bandwidth distribution method, first, and 0LT sends broadcasting packet to 0NU, and the broadcasting packet carries BWmap, wherein being that N number of TC distributes bandwidth per frame BWmap, N is the natural number more than 512；
Wherein, N maximum is 2047.
Wherein, before Ci Walk are rapid, 0LT will send broadcasting packet to 0NU during 0NU authentication registrations, 0NU authentication registrations process here as shown in fig. 6, comprising 5 processes, Specifically it may refer to the standards of G987. 3：
(1) ONU is first in 01 state, and this state is preparing state；
(after 2) Tong Walk to downlink frame, into 02/03 state；
(3) 0LT periodically sends summary info " Profile Message ", and periodic allocation sequence code SN reports bandwidth；There are the information such as delimiter, lead code in " Profile Message "；0NU is received after " Profile Message ", and SN is reported within the cycle for reporting sequence code SN;
(4) after 0LT receives the SN that 0NU is reported, 0NU, distribution 0NU mark 0NU- ID are found;0NU is received after 0NU-ID, into 04 state；
(5) 0LT distributes ranging bandwidth；0NU responds ranging message；0LT issues equivalent delay time EQD;0NU enters 05 state, completion of reaching the standard grade；
Described broadcasting packet can pass through physical layer operations and management message（Physical Layer Organization and Management, PL0AM) message transmission, it can be transmitted with a self-defined new message, the embodiment of the present invention is not limited to the message packet specifically used.
Jin mono- Walk, 0LT is after above-mentioned 04 state ranging, issue equivalent delay EQD to 0NU, here equivalent delay EQD fixes increase one or more cycles, described a cycle is 125us, that is 0LT is handed down to 0NU equivalent delay time EQD fixed increase 125us on the basis of existing integral multiple so that 0NU has time enough to parse BWmap messages.
Wherein, described EQD can be calculated according to equation below, may refer to standard G987. 3 pages 64 regulation, specific as follows：
Tead≥ RspTim + ( min + Dm
Wherein, TeqdFor identifying the equivalent delay time and round-trip delay（Round Trip Delay, RTD) sum, according to apart from farthest ONU calculating, and snap to 125us integral multiple,
RspTimemaxAccording to standard G987. 3 regulation, RspTime is 35 ± 1 μ s, therefore is that RspTime Sui are 36us,
LminFor identifying minimum range, DmaxRange difference for identifying minimum range and ultimate range,
n1577、 n127.It is respectively used to identify the refractive index of uplink and downlink,
C is used to identify the light velocity；
Described broadcasting packet can pass through physical layer operations and management message（Physical Layer Organization and Management, PLOAM) message transmission, it can be transmitted with a self-defined new message, the embodiment of the present invention is not limited to the message packet specifically used.
N number of transmission container total bandwidth size groups that second, 0NU are distributed according to the BWmap fill upstream data and sent to 0LT.
During this Walk of are rapid, the equivalent delay time resolution BWmap that 0NU is carried in the broadcasting packet according to reception;The 0NU response times use 35 ± 1 μ s as defined in standard G987. 3, bandwidth initial time according to standard G987. 3 predetermined operation.
Pass through above technical scheme, the number of bandwidth is distributed per frame to be expanded to 2047 from 512, be significantly shorten assignment period, reduced the requirement cached to 0NU, and then the service delays such as the time division multiplexing that 0NU is carried are also reduced, improve user satisfaction.
Example IV The embodiment of the present invention additionally provides a kind of passive optic network up bandwidth distribution method, first, and 0LT sends broadcasting packet to 0NU, and the broadcasting packet carries BWmap, wherein being that N number of TC distributes bandwidth per frame BWmap, N is the natural number more than 512；
Wherein, N maximum is 2047.
Described broadcasting packet can pass through physical layer operations and management message（Physical Layer Organization and Management, PLOAM) message transmission, it can be transmitted with a self-defined new message, the embodiment of the present invention is not limited to the message packet specifically used.
Jin mono- Walk, it is handed down in 0LT in 0NU broadcast message, the bandwidth initial time StartTime of BWmap per frame fixes increase one or more cycles, described a cycle is 125us, g Jie 0LT are handed down in 0NU broadcast message, the StartTime carried in BWmap fixed increase 125us on the basis of existing integral multiple so that 0NU has time enough to parse BWmap messages.
The bandwidth initial time parsing BWmap that second, 0NU are carried in the broadcasting packet according to reception, concurrently serves row light.By above technical scheme, the number of bandwidth is distributed per frame to be expanded to 2047 from 512, significantly shorten assignment period, reduce the requirement cached to 0NU.Embodiment five the embodiments of the invention provide a kind of optical network unit 0NU, as shown in fig. 7, comprises：Receiving unit 710, for receiving multiple downlink frames from 0LT, each downlink frame carries the N number of subfield of bandwidth allocation bitmap BWmap, the BWmap including distributing bandwidth for N number of TC, wherein, N is the integer more than 512； Resolution unit 720, for parsing the BWmap, obtains the bandwidth for the TC for distributing to the 0NU；Transmitting element 730, the bandwidth for the TC according to acquisition sends upstream data.Wherein, the 0NU parses the BWmap using the 0NU response times, wherein, it is described
The 0NU response times are more than 36 us, and the 0NU response times are used to identify the 0NU circuit delay times.
Or, the 0NU parses the BWmap according to equivalent delay time EQD, wherein, the EQD is that the 0LT is handed down to the 0NU, and the EQD is used to identify one times or the multiple integral multiples that EQD described in 0LT ports distance and the 0NU distance is 125 microseconds.
Or, the 0NU parses the BWmap according to bandwidth initial time StartTime, wherein, the StartTime is that the 0LT is handed down to the 0NU, described
StartTime is used to identify one times or multiple integral multiples of the StartTime described in position of the luminous time slot for distributing to the TC in the BWmap for 125 microseconds.
Jin mono- Walk, the 0NU responses are the 0NU response times that the 0NU is handed down to by the 0LT；Or, the 0NU response times are the 0NU response times of the 0NU itself configurations.
Jin mono- Walk, the 0NU response times are numbers of the 0LT according to the TC connected under port, or the BWmap maximum transmission container numbers that can carry are calculated.
Wherein, the maximum transmission container number that the BWmap can be carried is 2047.
Embodiment six The embodiments of the invention provide a kind of optical line terminal 0LT, as shown in figure 8, including：Transmitting element 810, the N number of subfield of bandwidth allocation bitmap BWmap, the BWmap including distributing bandwidth for N number of TC is carried for sending in multiple downlink frames, each downlink frame, wherein, N is the integer more than 512；
Receiving unit 820, for receiving the upstream data that the 0NU is sent according to the bandwidth for parsing the TC that the BWmap is obtained.Wherein, 0LT issues the 0NU response times to the 0NU, wherein, the 0NU response times are used for 0NU and parse the BWmap, and the ONU response times are used for the circuit delay time for identifying the ON U.
Jin mono- Walk, transmitting element is additionally operable to issue equivalent delay time EQD to the 0NU, the EQD is used for the 0NU and parses the BWmap, the EQD is used to identify the distance that the EQD is used to identify 0LT ports distance and the 0NU, and the EQD is one times or multiple integral multiples of 125 microseconds.
Jin mono- Walk, transmitting element is additionally operable to issue bandwidth initial time StartTime to the 0NU, and the StartTime is used for the 0NU and parses the BWmap, described
StartTime is used to identify position of the luminous time slot for distributing to the TC in the BWmap, and the StartTime is one times or multiple integral multiples of 125 microseconds.
Jin mono- Walk, the 0NU response times are numbers of the 0LT according to the TC connected under port, or the BWmap maximum TC numbers that can carry are calculated.
Wherein, the maximum transmission container number that the BWmap can be carried is 2047.
Embodiment seven
The system of bandwidth allocation in a kind of EPON, including optical line terminal and optical network unit, wherein, it is the optical network unit that optical line terminal, which is used for by upstream bandwidth assignment bit map, Bandwidth is distributed, wherein, bandwidth allocation bitmap described in per frame is N number of transmission container allocation bandwidth, and the N is the natural number more than 512；
The optical network unit, N number of transmission container total bandwidth size groups for being distributed according to the optical line terminal fill upstream data and are sent to the optical line terminal.
The optical line terminal is additionally operable to issue broadcasting packet to the optical network unit, and the broadcasting packet carries first and parses the time, and the first parsing time is used to identify the time needed for the optical network unit parsing N number of transmission container；The first parsing time is number of the optical line terminal according to the transmission container of connection, or the number of the maximum transmitted container that can be carried per frame bandwidth allocation bitmap is calculated.
The detailed description of the specific optical network unit may refer to the description in embodiment five to optical network unit, and the detailed description of the optical line terminal may refer to the description of optical line terminal in embodiment six.Jin mono- Walk, the interaction flow of optical line terminal described in the system of bandwidth allocation and each optical network unit may refer to the detailed description for the method that embodiment one is distributed to example IV kind upstream bandwidth in the EPON, just repeat no more here.
Pass through above technical scheme, the number that 0LT distributes bandwidth per frame can be expanded to 2047 from 512, significantly shorten assignment period, reduce the requirement cached to 0NU, and then the service delays such as the time division multiplexing that 0NU is carried are also reduced, improve user satisfaction.
Through the above description of the embodiments, those skilled in the art can be understood that the present invention can add the mode of required hardware platform to realize by software, naturally it is also possible to all be implemented by hardware.Based on it is such understand, technical scheme background technology is contributed in whole or in part can in the form of software product body Reveal and, the computer software product can be stored in storage medium, such as R0M/RAM, magnetic disc, CD, including some instructions are to cause a computer equipment（Can be personal computer, server, or network equipment etc.）Perform the method described in some parts of each embodiment of the invention or embodiment.
Several embodiments of the present invention are the foregoing is only, those skilled in the art can carry out various changes or modification to the present invention without departing from the spirit and scope of the present invention according to disclosed in application documents.

Claims (7)

  1. Claims
    1st, a kind of bandwidth allocation methods, the method of the bandwidth allocation is applied in passive optical network, the system includes optical line terminal 0LT and at least one optical network unit 0NU, any one optical network unit 0NU supports multiple transmission container TC, characterized in that, methods described includes：
    The 0NU receives the downlink frame from the 0LT, and each downlink frame carries the N number of subfield of bandwidth allocation bitmap BWmap, the BWmap including distributing bandwidth for N number of TC, wherein, N is the integer more than 512；
    The 0NU parses the BWmap, obtains the bandwidth for the TC for distributing to the ONU；
    The 0NU sends upstream data according to the TC of acquisition bandwidth.
    2nd, the method as described in claim 1, it is characterised in that the 0NU parses the BWmap, Jin mono- Walk include：
    The 0NU parses the BWmap using the 0NU response times, wherein, described 0NU mouthfuls to 36 us are more than between seasonable, the ONU response times are used to identify the ONU circuit delay times.
    3rd, method as claimed in claim 2, it is characterised in that the 0NU response times be by the 0LT be handed down to the 0NU the 0NU response times '
    Or, the 0NU response times are the 0NU response times of the 0NU itself configurations.
    4th, method as claimed in claim 2 or claim 3, it is characterised in that the 0NU responses Time is numbers of the OLT according to the TC connected under port, or the BWmap maximum transmission container numbers that can carry are calculated.
    5th, the method as described in claim 1, it is characterised in that the 0NU parses the BWmap, Jin mono- Walk include：
    The 0NU parses the BWmap according to equivalent delay time EQD,
    Wherein, the EQD is that the 0LT is handed down to the 0NU, and the EQD is used for the distance for identifying 0LT ports distance and the 0NU, and the EQD is one times or multiple integral multiples of 125 microseconds.
    6th, the method as described in claim 1, it is characterised in that the 0NU parses the BWmap, Jin mono- Walk include：
    The 0NU parses the BWmap according to bandwidth initial time StartTime, wherein, the StartTime is that the 0LT is handed down to the 0NU, described
    StartTime is used to identify position of the luminous time slot for distributing to the TC in the BWmap, and the StartTime is one times or multiple integral multiples of 125 microseconds.
    7th, a kind of bandwidth allocation methods, it is characterized in that, the method of the bandwidth allocation is applied in passive optical network P0N, the system P0N includes optical line terminal 0LT and at least one optical network unit 0NU, any one optical network unit 0NU supports multiple transmission container TC, characterized in that, methods described includes：
    The optical line terminal 0TL, which is sent, carries the N number of subfield of bandwidth allocation bitmap BWmap, the BWmap including distributing bandwidth for N number of TC in multiple downlink frames, each downlink frame, wherein, N is the integer more than 512； The upstream data that the ONU is sent is received, wherein, the upstream data is that the 0NU is assembled according to the bandwidth of the BWmap acquisitions is parsed.
    8th, method as claimed in claim 7, it is characterised in that methods described also includes：The 0LT issues the 0NU response times to the 0NU,
    Wherein, the 0NU response times are used for 0NU and parse the BWmap, described ONU mouthful between seasonable for identifying the circuit delay time of the ON U.
    9th, method as claimed in claim 8, it is characterised in that the 0NU response times are numbers of the 0LT according to the TC connected under port, or the BWmap maximum TC numbers that can carry are calculated.
    10th, method as claimed in claim 7, it is characterised in that methods described also includes：The 0LT issues equivalent delay time EQD to the 0NU, wherein,
    The EQD is used for the 0NU and parses the BWmap, and the EQD is used for the distance for identifying 0LT ports distance and the 0NU, and the EQD is one times or multiple integral multiples of 125 microseconds.
    11st, method as claimed in claim 7, it is characterised in that methods described also includes：The 0LT issues bandwidth initial time StartTime to the 0NU, wherein, the StartTime is used for the 0NU angles early analysis BWmap, the StartTime is used to identify position of the luminous time slot for distributing to the TC in the BWmap, and the StartTime is one times or multiple integral multiples of 125 microseconds.
    12nd, a kind of optical network unit, it is characterised in that including： Receiving unit, for receiving multiple downlink frames from 0LT, each downlink frame carries the N number of subfield of bandwidth allocation bitmap BWmap, the BWmap including distributing bandwidth for N number of TC, wherein, N is the integer more than 512；
    Resolution unit, for parsing the BWmap, obtains the bandwidth for the TC for distributing to the 0NU；
    Transmitting element, the bandwidth for the TC according to acquisition sends upstream data.
    13rd, optical network unit as claimed in claim 12, it is characterised in that the resolution unit is used to parse the BWmap, obtains the bandwidth for the TC for distributing to the 0NU, and Jin mono- Walk include：
    The 0NU parses the BWmap using the 0NU response times, wherein, described 0NU mouthfuls to 36 us are more than between seasonable, the 0NU response times are used to identify the 0NU circuit delay times.
    14th, optical network unit as claimed in claim 13, it is characterised in that the 0NU responses are the 0NU response times that the 0NU is handed down to by the 0LT；
    Or, the 0NU response times are the 0NU response times of the 0NU itself configurations.
    15th, the optical network unit as described in claim 13 or 14, it is characterized in that, the 0NU response times are numbers of the 0LT according to the TC connected under port, or the BWmap maximum transmission container numbers that can carry are calculated.
    16th, optical network unit as claimed in claim 12, it is characterised in that the resolution unit is used to parse the BWmap, obtains the bandwidth for the TC for distributing to the 0NU, and Jin mono- Walk include： The ONU parses the BWmap according to equivalent delay time EQD, wherein, the EQD is that the 0LT is handed down to the 0NU, and the EQD is used to identify one times or the multiple integral multiples that EQD described in 0LT ports distance and the 0NU distance is 125 microseconds.
    17th, optical network unit as claimed in claim 12, it is characterised in that the resolution unit is used to parse the BWmap, obtains the bandwidth for the TC for distributing to the ONU, and Jin mono- Walk include：
    The 0NU parses the BWmap according to bandwidth initial time StartTime,
    Wherein, the StartTime is that the 0LT is handed down to the 0NU, described
    StartTime is used to identify one times or multiple integral multiples of the StartTime described in position of the luminous time slot for distributing to the TC in the BWmap for 125 microseconds.
    18th, a kind of optical line terminal 0LT, it is characterised in that the 0LT includes：Transmitting element, the N number of subfield of bandwidth allocation bitmap BWmap, the BWmap including distributing bandwidth for N number of TC is carried for sending in multiple downlink frames, each downlink frame, wherein, N is the integer more than 512；
    Receiving unit, for receiving the upstream data that the 0NU is sent according to the bandwidth for parsing the TC that the BWmap is obtained.
    19th, 0LT as claimed in claim 18, it is characterised in that transmitting element is additionally operable to：The 0NU response times are issued to the 0NU, wherein, the 0NU response times are used for 0NU and parse the BWmap, and the ONU response times are used for the circuit delay time for identifying the ONU. 20th, OLT as claimed in claim 18, it is characterised in that the 0NU response times are numbers of the 0LT according to the TC connected under port, or the BWmap maximum TC numbers that can carry are calculated.
    21st, 0LT as claimed in claim 18, it is characterised in that transmitting element is additionally operable to：Issue equivalent delay time EQD to the 0NU, the EQD is used for the 0NU and parses the BWmap, the EQD is used to identify the distance that the EQD is used to identify 0LT ports distance and the 0NU, and the EQD is one times or multiple integral multiples of 125 microseconds.
    22nd, 0LT as claimed in claim 18, it is characterised in that transmitting element is additionally operable to：Bandwidth initial time StartTime is issued to the 0NU, the StartTime is used for the 0NU and parses the BWmap, the StartTime is used to identify position of the luminous time slot for distributing to the TC in the BWmap, and the StartTime is one times or multiple integral multiples of 125 microseconds.
    23rd, a kind of passive optical network, it is characterised in that the system includes the optical line terminal as described in any one of claim 18 2 and the optical network unit as described in claim 12^17 any one.
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