WO2017028623A1

WO2017028623A1 - Method and device for channel configuration

Info

Publication number: WO2017028623A1
Application number: PCT/CN2016/087296
Authority: WO
Inventors: 操日祥
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-08-19
Filing date: 2016-06-27
Publication date: 2017-02-23
Also published as: CN106470366B; CN106470366A

Abstract

A method for channel configuration. The method for channel configuration comprises: an Optical Line Terminal (OLT) obtains each downlink channel and corresponding uplink channels thereof; the OLT binds the each obtained downlink channel and corresponding multiple uplink channels thereof to one channel beam, wherein, the downlink channel in the channel beam and any uplink channel in the channel beam are bound to form physical channels.

Description

Channel configuration method and device

Technical field

This document relates to, but is not limited to, the field of communication technologies, and in particular, to a channel configuration method and apparatus.

Background technique

With the development of network technology, a large amount of voice, data, and video services can be transmitted through the network. Therefore, the bandwidth requirements are continuously improved, and a PON (Passive Optical Network) is generated under such a demand. The PON system usually consists of an Optical Line Terminal (OLT) on the central office, an Optical Network Unit (ONU) on the user side, and an Optical Distribution Network (ODN). To a multi-point network structure. ODN consists of single-mode fiber and passive optical components such as optical splitters and optical connectors, providing optical transmission media for the physical connection between the OLT and the ONU. In order to further increase the bandwidth of the network, a PON system that transmits multiple wavelengths in the backbone fiber and reuses the time division technology to provide access at each wavelength is called TWDM (Time wavelength Division Multiplexing) PON. system.

The topology of the TWDM PON system is as shown in Figure 1. The TWDM PON OLT has multiple TWDM CTs (Channel Terminations), and each TWDM CT processes a pair of associated uplink and downlink wavelength channels (the upstream and downstream wavelengths). The channels form a physical channel) and provide access and maintenance services for all ONUs operating in this physical channel. The uplink and downlink wavelength channels processed by different TWDM CTs are different. As shown in FIG. 1, the downlink signal CH1d of TWDM channel 1 (ie, TWDM channel 1 in FIG. 1) is bound to the uplink signal CH1u sent from the ONU. For work, other TWDM channels are similar, and each ONU has and can only choose to operate in a TWDM channel. The strict CT binding of the TWDM PON system is a simple and efficient way of working. However, it is not flexible for some network applications. The potential of the network is not fully explored. Take the example shown in Figure 2 as an example. During a certain period of time in a TWDM PON network or in a certain configuration, the downlink CH1d of channel 1 and the downlink data queue of downlink CH2d of channel 2 occupy a relatively busy level, reaching more than 90% of the respective channel bandwidth. The uplink of channel 1 is in a particularly busy state, reaching 120% of the full bandwidth of the channel, and the uplink of channel 2 is in a completely idle state. At this time, some ONU data must be in the waiting state in channel 1, due to TWDM PON. Due to the limitation of CT binding, the uplink data in channel 1 cannot be transmitted on channel 2 in the completely idle state, and this upstream bandwidth is wasted at this time. By the same token, when one channel is overloaded and the other channel is idle, the downlink bandwidth of the idle channel is also wasted. It can be seen that due to the unbalanced channel load, in some special cases, the bandwidth resource of the TWDM PON network is greatly wasted.

Summary of the invention

The following is an overview of the topics detailed in this document. This Summary is not intended to limit the scope of the claims.

The embodiment of the invention provides a channel configuration method and device, which can reduce the waste of PON network bandwidth.

A channel configuration method provided by an embodiment of the present invention includes the following steps:

The optical line terminal OLT acquires each downlink channel and its corresponding multiple uplink channels;

The OLT binds each of the obtained downlink channels and the corresponding multiple uplink channels to one channel bundle, where the downlink channel in the channel bundle is bound to any uplink channel in the channel bundle to form a physical channel. .

Optionally, after the step of the OLT binding the obtained one downlink channel and the corresponding multiple uplink channels to one channel bundle, the channel configuration method further includes the following steps:

After registering the optical network unit ONU, the OLT acquires a channel bundle in which the ONU is located;

The OLT allocates a first bandwidth parameter to the channel bundle where the ONU is located, and allocates a second bandwidth parameter to the ONU according to the first bandwidth parameter.

Optionally, after the step of the OLT assigning a first bandwidth parameter to the channel bundle, and assigning a second bandwidth parameter to the ONU according to the first bandwidth parameter, the channel configuration method further includes the steps of:

Obtaining, by the OLT, the second bandwidth parameter corresponding to an ONU in the channel bundle;

The OLT according to a preset physical channel constraint condition, and a second bandwidth corresponding to an ONU The number of ONUs allocates slot parameters and physical channel information, wherein the slot parameters include a slot ID, a slot length, and a slot start position;

The OLT sends the slot parameter and the physical channel information to the corresponding ONU, so that the ONU transmits data to the OLT based on the received physical channel information and the slot parameter.

Optionally, the step of the OLT assigning the slot parameter and the physical channel information to the ONU according to the preset physical channel constraint condition and the second bandwidth parameter corresponding to the ONU includes:

Assigning, by the OLT, the slot ID and the slot length to one ONU according to the second bandwidth parameter corresponding to the one ONU;

And assigning, by the OLT, a time slot ID and a time slot length corresponding to one ONU in the channel bundle to a corresponding physical channel according to the physical channel constraint condition corresponding to a physical channel in the channel bundle, and setting The start position of a time slot of an ONU in the corresponding physical channel.

Optionally, the OLT sends a slot parameter and physical channel information to the corresponding ONU, after the step of the ONU transmitting data to the OLT based on the received physical channel information and the slot parameter, The channel configuration method further includes the steps of:

The OLT acquires data of the same channel bundle when receiving data uploaded by the ONU through its corresponding physical channel;

The OLT performs a convergence operation on data of the same channel bundle to restore data uploaded by the ONU.

The embodiment of the present invention further provides a channel configuration apparatus, where the channel configuration apparatus includes:

Obtaining a module, configured to acquire each downlink channel and corresponding ones of the uplink channels;

The binding module is configured to bind each obtained downlink channel and its corresponding multiple uplink channels into one channel bundle, where the downlink channel in the channel bundle is bound to any uplink channel in the channel bundle Form a physical channel.

Optionally, the acquiring module is further configured to: after registering the optical network unit ONU, acquiring a channel bundle where the ONU is located; the channel configuration apparatus further includes an allocation module, configured to be a channel where the ONU is located The bundle allocates a first bandwidth parameter, and allocates a second bandwidth parameter to the ONU according to the first bandwidth parameter.

Optionally, the acquiring module is further configured to acquire an ONU pair in the channel bundle The second bandwidth parameter, the allocation module is further configured to allocate a time slot parameter and physical channel information to the ONU according to a preset physical channel constraint condition and a second bandwidth parameter corresponding to an ONU, where The slot parameter includes a slot ID, a slot length, and a slot start position; the channel configuration apparatus further includes a sending module configured to send the slot parameter and the physical channel information to the corresponding ONU, for the ONU to receive based The physical channel information and the time slot parameters are transmitted to the OLT.

Optionally, the allocation module includes:

The allocating unit is configured to allocate the time slot ID and the time slot length to one of the ONUs according to the second bandwidth parameter corresponding to the one ONU;

The allocating unit is further configured to allocate, according to the physical channel constraint condition corresponding to one physical channel in the channel bundle, a slot ID and a slot length corresponding to one ONU in the channel bundle to a corresponding physical entity. channel;

The setting unit is configured to set a start position of a time slot of the ONU in the corresponding physical channel.

Optionally, the acquiring module is further configured to: acquire data of the same channel bundle when receiving data uploaded by the ONU through the corresponding physical channel; the channel configuration apparatus further includes a convergence module, configured to be the same The data of the channel bundle is aggregated to restore data uploaded by the ONU.

According to the channel configuration method and device of the embodiment of the present invention, the optical line terminal OLT acquires each downlink channel and its corresponding multiple uplink channels, and binds each obtained downlink channel and its corresponding multiple uplink channels to one. a channel bundle, wherein the downlink channel in the channel bundle is bound to any one of the channel bundles to form a physical channel, and after performing the channel bundle binding, the uplink available bandwidth resources in the channel bundle are shared. The uplink dynamic bandwidth allocation is not affected by the downlink channel, and can be arbitrarily switched between different uplink channels to avoid the situation that some physical channels in the PON network are too busy and some physical channels are too idle, thereby reducing bandwidth. In this solution, since the downlink channel in one channel bundle can form a physical channel with any uplink channel in the channel bundle, only the uplink channel needs to be switched when channel switching is performed, that is, only Upstream wavelength tuning, since the downlink reception does not change, thus avoiding the wavelength switching The downlink synchronization process, in particular, the upstream wavelength tuning current speed can reach several nanoseconds, which enables channel switching to be completed in one burst frame, which greatly improves the channel switching efficiency of the PON network.

Other aspects will be apparent upon reading and understanding the drawings and detailed description.

BRIEF abstract

1 is a schematic diagram of configuration of an uplink channel and a downlink channel in the related art;

2 is a schematic diagram of a network state of multiple channels in FIG. 1;

3 is a schematic flowchart of a first embodiment of a channel configuration method according to the present invention;

4 is a schematic view of a channel bundle according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart diagram of a second embodiment of a channel configuration method according to the present invention; FIG.

6 is a schematic flowchart of a third embodiment of a channel configuration method according to the present invention;

FIG. 7 is a schematic diagram of a refinement process for allocating physical channels and time slot parameters for an ONU according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic diagram of an ONU physical channel allocation process according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic diagram of aggregation of received data by an OLT according to an embodiment of the present invention; FIG.

10 is a schematic diagram of functional modules of a first embodiment of a channel configuration apparatus according to the present invention;

11 is a schematic diagram of functional modules of a second embodiment of a channel configuration apparatus according to the present invention;

12 is a schematic diagram of functional modules of a third embodiment of a channel configuration apparatus according to the present invention;

FIG. 13 is a schematic diagram of a refinement function module of an allocation module in a third embodiment of a channel configuration apparatus according to the present invention.

Embodiments of the invention

It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The present invention provides a channel configuration method.

Referring to FIG. 3, FIG. 3 is a schematic flowchart diagram of a channel configuration method according to a first embodiment of the present invention.

This embodiment provides a channel configuration method, where the channel configuration method includes:

Step S10, the optical line terminal OLT acquires each downlink channel and its corresponding multiple uplink channels;

In a general PON network, the channel in the optical line terminal is a TWDM channel, and one TWDM channel is divided into an uplink channel and a downlink channel. In the TWDM system, there are usually multiple uplink channels and downlink channels, one uplink channel and one downlink channel. For one physical channel, the OLT transmits data to the ONU through the downlink channel in the physical channel corresponding to the ONU, and the ONU sends data to the OLT through the uplink channel in the physical channel where the ONU is located.

In step S20, the OLT binds the obtained one downlink channel and its corresponding multiple uplink channels into one channel bundle, where the downlink channel in the channel bundle is bound to any uplink channel in the channel bundle. Physical channel.

The binding of the uplink channel to the downlink channel can be implemented by adding the same channel bundle identifier to the channels belonging to the same channel bundle, and the channel bundle to which each channel belongs can be distinguished based on the channel bundle identifier. Each of the uplink channel and the downlink channel is provided with a corresponding channel identifier, and the physical channel can be identified based on the combination of each uplink channel identifier and the downlink channel identifier.

It can be understood that each downlink channel can be bound to one channel bundle with all uplink channels in the OLT, or the downlink channel can also be bound to a certain channel bundle in the OLT, and the number of uplink channels is bound. It can be set by the user as needed, that is, when receiving the channel bundle configuration command, the optical line terminal OLT acquires the numbers of the multiple uplink channels corresponding to each downlink channel based on the channel bundle configuration command; the optical line terminal OLT will each The downlink channel is bound to the multiple uplink channels of the corresponding number; the optical line terminal OLT, when the number of the multiple uplink channels corresponding to the downlink channel fails to be obtained based on the channel bundle configuration command, each downlink channel and all corresponding uplinks The channels are bound into a single channel bundle.

In this embodiment, the alternative is to bind each downlink channel to all the uplink channels, and the bandwidth resources of all the uplink channels are shared, and the uplink dynamic bandwidth allocation is all network, so that the uplink data transmission is more flexible.

4 is a schematic diagram of a channel bundle. The channel bundle BCT1 is composed of a downlink channel of channel 1 (ie, TWDM channel 1 in FIG. 4) and all uplink channels (including TWDM channel 2 to TWDM channel n in FIG. 4). The channel bundle, wherein each of the uplink channels and the channel 1 downlink channel form a physical channel Ch1j (j=1, 2...n), 1 is a downlink channel number, and j is an uplink channel number, n is the number of upstream channels. Similarly, the channel bundle BCT2 is a channel bundle composed of a downlink channel of channel 2 and all uplink channels, wherein each uplink channel and channel 2 downlink channel form a physical channel Ch2j (j=1, 2...n), 2 is The downlink channel number, j indicates the uplink channel number, n is the number of uplink channels; the channel bundle BCTm is the channel bundle composed of the downlink channel of channel m and all uplink channels, each of which forms a physical channel with the downlink wavelength of channel n Chmj (j = 1, 2...n), m is the downlink channel number, j is the uplink channel number, and n is the number of uplink channels. The upstream channels in different channel bundles are partially or completely overlapping.

In the channel configuration method, the optical line terminal OLT acquires each downlink channel and its corresponding multiple uplink channels, and binds each obtained downlink channel and its corresponding multiple uplink channels into one channel bundle. The downlink channel in the channel bundle is bound to any uplink channel in the channel bundle to form a physical channel. After the channel bundle binding, the uplink available bandwidth resources in the channel bundle are shared, and the uplink dynamic bandwidth is The allocation is not affected by the downlink channel, and any switching between different uplink channels can be performed to avoid the situation that some physical channels in the PON network are too busy and some physical channels are too idle, thereby reducing the waste of bandwidth; In the solution, since the downlink channel in one channel bundle can form a physical channel with any uplink channel in the channel bundle, when performing channel switching, only the uplink channel needs to be switched, that is, only the uplink wavelength needs to be tuned. The channel switching efficiency of the PON network is made high.

Since the downlink reception does not change, the downlink synchronization process after the wavelength switching of the traditional PON system is avoided, in particular, the uplink wavelength tuning current speed can reach several nanoseconds, which enables the channel switching to be completed in one burst frame. For example, an ONU sends a first burst frame using physical channel 1, and when transmitting a second burst frame, it can instantaneously switch to physical channel 2 and send a second burst frame without any time lag. And resource cost, which greatly improves the channel switching efficiency of the PON network.

Optionally, in order to improve the accuracy of the channel configuration, the second embodiment of the channel configuration method of the present invention is proposed based on the first embodiment. In this embodiment, referring to FIG. 5, in the embodiment, the step S20 includes steps. :

Step S30, after registering the optical network unit ONU, the OLT acquires a channel bundle where the ONU is located;

Step S40, the OLT allocates a first bandwidth parameter to a channel bundle where the ONU is located, and And assigning, by the first bandwidth parameter, the second bandwidth parameter to the ONU.

The first bandwidth parameter may include an uplink bandwidth parameter and a downlink bandwidth parameter of the channel bundle. Here, the downlink of the channel bundle is only one wavelength, and the bandwidth parameter allocation is the same as that described in the prior art, such as the ITU-T, ITU Telecommunication Standardization Sector (G.989.3).

The first bandwidth parameter, here, may only refer to the total uplink bandwidth allocated by each channel bundle, including the fixed bandwidth Rf_B, the guaranteed bandwidth Ra_B, and the non-guaranteed bandwidth Rna_B.

The fixed bandwidth Rf_B in the first bandwidth parameter may include a fixed bandwidth allocated by the network administrator or the system to each channel bundle by default, or may be included by the network administrator or the system to the ONU in each channel bundle by default. The fixed bandwidth allocated is added to calculate the fixed bandwidth of the channel bundle. The fixed bandwidth Rf_B of the channel bundle is a fixed value, such as 10 Gbit/s.

The guaranteed bandwidth Ra_B in the first bandwidth parameter is a dynamic change value, which depends on the sum of the load of all ONUs in the channel bundle, and the guaranteed bandwidth allocated by the network administrator or the system to each channel bundle by default. Assured bandwidth or the guaranteed bandwidth of the channel bundle calculated by the network administrator or the default bandwidth allocated by the ONU in each channel bundle. Generally, the minimum value of the two is the channel bundle. Guaranteed bandwidth. The load of the ONU can be easily obtained in the existing PON system. For example, the ONU described in the ITU-T G.989.3 standard reports the load queue information to the OLT through the DBAu message or the uplink sent by the OLT through the observation of the ONU. The idle code condition of the data is obtained.

The non-guaranteed bandwidth Rna_B of the first bandwidth parameter is a dynamically transformed bandwidth. After the OLT deducts the sum of the fixed bandwidth and the guaranteed bandwidth of all the channel bundles, the remaining link bandwidth of the system is allocated to each channel. The bandwidth of the bundle is maximized by the allocation of the first bandwidth parameter non-guaranteed bandwidth Rna_B. The method for allocating the first bandwidth parameter non-guaranteed bandwidth may refer to the manner described in the ITU-T G.989.3 standard, such as the Best effort allocation mode, and the priority or weight allocation manner based on the ONU or the channel bundle.

The second bandwidth parameter may include an uplink bandwidth parameter and a downlink bandwidth parameter of one ONU. Here, the downlink of an ONU is fixed in a channel bundle, which is only one wavelength, and its bandwidth allocation is the same as that in the prior art, as described in the ITU-T G.989.3 standard, where the second bandwidth parameter can be It refers only to the upstream bandwidth allocated by an ONU, including the fixed bandwidth Rf_s, and the guaranteed bandwidth Ra_s. And the non-guaranteed bandwidth Rna_s three parts.

The fixed bandwidth Rf_s in the second bandwidth parameter ensures that the bandwidth Ra_s is allocated in the same manner as described in the prior art, such as the ITU-T G.989.3 standard.

The non-guaranteed bandwidth Rna_s is a dynamically transformed bandwidth, and after subtracting the sum of the fixed bandwidth and the guaranteed bandwidth of all allocated ONUs in the channel bundle, the remaining channel bundle bandwidth of the system is allocated to each ONU. The bandwidth of the system is maximized by the allocation of the ONU non-guaranteed bandwidth Rna_s. The method for allocating the non-guaranteed bandwidth in the second bandwidth parameter may refer to the manner described in the ITU-T G.989.3 standard, such as the Best effort allocation method, and the priority or weight allocation manner based on the ONU or the channel bundle. Compared with the conventional technology, based on a single uplink resource with limited uplink wavelength, the allocation of the second bandwidth parameter is based on channel bundle resources including multiple uplink wavelengths, and the utilization efficiency of bandwidth resources and the flexibility of allocation are obtained very well. Great improvement.

Optionally, in order to improve the flexibility of the communication, the third embodiment of the channel configuration method of the present invention is proposed based on the second embodiment. In this embodiment, referring to FIG. 6, in the embodiment, the step S40 includes the following steps:

Step S50, the OLT acquires the second bandwidth parameter corresponding to an ONU in the channel bundle.

In step S60, the OLT allocates a slot parameter and a physical channel information to the ONU according to a preset physical channel constraint condition and a second bandwidth parameter corresponding to an ONU, where the slot parameter includes a slot ID and a slot length. And the start position of the time slot;

The physical channel constraint is a physical channel constraint in the PON communication protocol, for example, the maximum bandwidth of the TWDM PON single-wavelength uplink is 10 Gbit/s, and details are not described herein again.

Referring to FIG. 7, the specific process of the step S60 for allocating a physical channel and a time slot parameter for the ONU includes:

Step S61, the OLT allocates the time slot ID and the time slot length to one ONU according to the second bandwidth parameter corresponding to the one ONU;

Step S62, the OLT divides the slot ID and the slot length corresponding to one ONU in the channel bundle according to the physical channel constraint condition corresponding to one physical channel in the channel bundle. It is assigned to the corresponding physical channel and sets the start position of a time slot of the ONU in the corresponding physical channel.

According to the second bandwidth parameter, the method for allocating the slot ID and the slot length to the ONU is a common technical method in the PON system, such as the time slot allocator described in the ITU-T G.989.3 standard, which is responsible for The bandwidth parameter (R bit/s) allocates the slot length (Length) according to the slot ID (Alloc Id), and passes the slot ID, slot length, and slot start position through the embedded management channel (Embeded OAM). ) is sent to the ONU. Here, since the specific physical channel of the transmission data of the ONU is not known, the time slot allocation is a virtual allocation, and does not include a specific final time that needs to be sent to the ONU through the embedded management channel (Embeded OAM). All information of slot ID, slot length, and slot start position.

Then, according to the actual bandwidth constraint condition of the physical channel, in the physical channel channel (CH, Channel) scheduler, the slot IDs and the corresponding slot lengths that are virtually allocated by all the channel bundles are arranged and combined, and the slot ID and corresponding are set. The time slot length is allocated to a specific physical channel in the channel bundle, and a slot ID and a corresponding slot length slot are set at a starting position in an uplink frame of the corresponding physical channel.

The input of the physical channel CH scheduler includes: a physical channel constraint condition, a time slot ID allocated by all channel bundles and a corresponding time slot length, and the output includes: a time slot ID, a corresponding physical channel, and a corresponding time thereof. The slot length and the location of the time slot on the physical channel are typically characterized by a starting location. The physical channel CH scheduler needs to ensure that all slot IDs and their slot lengths are cleared as much as possible. The physical channel CH scheduler can be easily implemented according to the prior art, such as a simple first in first out (FIFO) stack. Algorithms, etc.

Referring to FIG. 8 , the TWDM PON DBA layer in the OLT allocates the bandwidth of the channel bundle BCT in the system, and specifically allocates the first bandwidth parameter to the channel bundle BCTi of the lower layer. a DBA (i=1, 2...) (Dynamic Bandwidth Assignment) layer, the channel bundle BCTi DBA agent allocates the second bandwidth parameter to the ONU to which the channel bundle belongs, the channel bundle time slot allocator, The ONU is allocated a time slot, that is, an Alloc id, and a time slot length (length) of each Alloc id according to the second bandwidth parameter of the ONU. All ocTi DBA submitted Alloc id, and the time slot length of each Alloc id will be handed over to the physical channel CH scheduler in the OLT, and the physical channel CH scheduler is responsible for the actual pair of the time slots. The ID (Alloc id) performs physical channel allocation, and its corresponding slot length and the location of the slot on the physical channel are generally characterized by a starting position. According to the result obtained by the physical channel CH scheduler scheduling algorithm, the OLT uses the PON embedded management channel (Embeded OAM) to set the slot ID, the corresponding physical channel, and the corresponding slot length and the slot on the physical channel. The starting position is sent to the ONU.

Step S70: The OLT sends the slot parameter and the physical channel information to the corresponding ONU, so that the ONU transmits data to the OLT based on the received physical channel information and the slot parameter.

After receiving the physical channel information, the ONU is based on the number corresponding to the physical channel in the physical signal information (optionally including the number of the uplink channel and the downlink channel, and the combination of the uplink channel number and the downlink channel number is the number of the physical channel), The wavelength corresponding to the uplink channel can be determined, and the channel tuning module in the ONU performs tuning according to the wavelength information, so that the wavelength of the uplink data frame conforms to the uplink channel.

It can be understood that the OLT sends the slot parameters and the physical channel information of the ONU to the corresponding ONU each time the downlink data frame transmission is performed.

Optionally, in order to improve the efficiency and accuracy of the data transmission, the fourth embodiment of the channel configuration method of the present invention is proposed based on the third embodiment. In this embodiment, the step S70 includes:

Step S80, when receiving data uploaded by the ONU through its corresponding physical channel, the OLT acquires data of the same channel bundle;

Step S90: The OLT performs a convergence operation on data of the same channel bundle to restore data uploaded by the ONU.

As the ONU needs to perform physical channel switching when sending each uplink data frame, the data needs to be aggregated at the OLT. The aggregation operation refers to all data frames sent by the same ONU in the same channel bundle. The number of the point or the data frame is recombined, that is, the number of the ONU carried in the uplink data frame sent by the ONU, such as the channel bundle label, indicating the channel bundle where the ONU is located, and the OLT is the same according to the number of one ONU. The data of the ONU is aggregated. Referring specifically to Figure 9, all TWDM passes in all i-th channel bundles BCTi The channel will be aggregated into a virtual BCTi channel bundle port, which is an entity that is externally connected to the TWDM PON multi-channel system. The data of the different channel bundles is identified by the actual TWDM PON physical channel, and then the data of the different channel bundles are distinguished by the BCT identification filter, and the data of the same BCTi channel bundle is aggregated to the corresponding BCTi channel bundle port.

The invention further provides a channel allocation device.

Referring to FIG. 10, FIG. 10 is a schematic diagram of functional modules of a first embodiment of a channel allocating apparatus according to the present invention.

It should be emphasized that, for those skilled in the art, the functional block diagram shown in FIG. 10 is merely an exemplary diagram of an alternative embodiment, and those skilled in the art can surround the functional modules of the channel allocating device shown in FIG. The function module of the present invention is not limited to the technical solution of the present invention. The functions to be achieved by the function modules that each define the name.

This embodiment provides a channel allocation apparatus, where the channel allocation apparatus includes:

The obtaining module 10 is configured to acquire each downlink channel and its corresponding multiple uplink channels;

The binding module 20 is configured to bind each obtained downlink channel and its corresponding multiple uplink channels into one channel bundle, where the downlink channel in the channel bundle is tied to any uplink channel in the channel bundle A physical channel is formed.

The binding of the uplink channel to the downlink channel can be implemented by adding the same channel bundle identifier to the channels belonging to the same channel bundle, and the channel bundle identifier can be distinguished based on the channel bundle identifier. Each of the uplink channel and the downlink channel is provided with a corresponding channel identifier, and the physical channel can be identified based on a combination of an uplink channel identifier and a downlink channel identifier.

It can be understood that each downlink channel can be bound to one of all uplink channels in the OLT. The channel bundle or the downlink channel can also be bound to a part of the uplink channel of the OLT as a channel bundle, and the number of binding uplink channels can be set by the user according to requirements, that is, when receiving the channel bundle configuration instruction, the optical line terminal OLT Obtaining, according to the channel bundle configuration instruction, a number of an uplink channel corresponding to each downlink channel; the optical line terminal OLT binding each downlink channel with multiple uplink channels of a corresponding number; and the optical line terminal OLT is configured according to the channel bundle When the instruction fails to obtain the number of multiple uplink channels corresponding to one downlink channel, a downlink channel is bound to all corresponding uplink channels into one channel bundle.

4 is a schematic diagram of a channel bundle. The channel bundle BCT1 is a channel bundle composed of a downlink channel of channel 1 and all uplink channels, and each of the uplink channels and the downlink channel of channel 1 form a physical channel Ch1j (j=1, 2...n), 1 is the downlink channel number, j is the uplink channel number, and n is the number of uplink channels. Similarly, the channel bundle BCT2 is a channel bundle composed of a downlink channel of channel 2 and all uplink channels, wherein each uplink channel and channel 2 downlink channel form a physical channel Ch2j (j=1, 2...n), 2 is The downlink channel number, j indicates the uplink channel number, n is the number of uplink channels; the channel bundle BCTm is the channel bundle composed of the downlink channel of channel m and all uplink channels, each of which forms a physical channel with the downlink wavelength of channel n Chmj (j = 1, 2...n), m is the downlink channel number, j is the uplink channel number, and n is the number of uplink channels. The upstream channels in different channel bundles are partially or completely overlapping.

In the channel configuration apparatus of the present embodiment, the optical line terminal OLT acquires each downlink channel and its corresponding multiple uplink channels, and binds one obtained downlink channel and its corresponding multiple uplink channels into one channel bundle. The downlink channel in the channel bundle is bound to any uplink channel in the channel bundle to form a physical channel. After the channel bundle binding is performed, the uplink available bandwidth resources in the channel bundle are shared, and the uplink dynamic bandwidth allocation is performed. Without being affected by the downlink channel, any switching between different uplink channels can be performed to avoid the situation that some physical channels in the PON network are too busy and some physical channels are too idle, thereby reducing bandwidth waste; In the case that the downlink channel in one channel bundle can form a physical channel with any uplink channel in the channel bundle, only the uplink channel needs to be switched when performing channel switching, that is, only the uplink wavelength needs to be adjusted. Harmonic, since the downlink reception does not change, thus avoiding the downlink synchronization process after the wavelength switching of the traditional PON system, in particular, the upstream wavelength tuning current speed can reach several nanoseconds, which makes the channel switching can be in one burst frame. Completion, for example, an ONU sends the first burst frame using physical channel 1, and when the second burst frame is sent, it can instantaneously switch to physical channel 2 and send the second burst frame without any time. Hysteresis and resource costs,

This greatly improves the channel switching efficiency of the PON network.

Optionally, in order to improve the accuracy of the channel configuration, the second embodiment of the channel configuration apparatus of the present invention is proposed based on the first embodiment. In this embodiment, referring to FIG. 11, in the embodiment, the acquiring module 10 further After the optical network unit ONU is registered, the channel bundle in which the ONU is located is acquired; the channel configuration apparatus further includes an allocation module 30 configured to allocate a first bandwidth parameter for the channel bundle in which the ONU is located, and according to the The first bandwidth parameter allocates a second bandwidth parameter to the ONU.

The guaranteed bandwidth Ra_B in the first bandwidth parameter is a dynamic change value, which depends on the sum of the load of all ONUs in the channel bundle, and the guaranteed bandwidth allocated by the network administrator or the system to each channel bundle by default. Assured bandwidth or the guaranteed bandwidth of the channel bundle calculated by the network administrator or the default bandwidth allocated by the ONU in each channel bundle. Generally, the minimum value of the two is the channel bundle. Guaranteed bandwidth. The load of the ONU can be easily obtained in existing PON systems, such as the ITU-T G.989.3 standard. The ONU reports the load queue information to the OLT through the DBAu message or the OLT obtains the idle code condition of the uplink data sent by the ONU.

The second bandwidth parameter may include an uplink bandwidth parameter and a downlink bandwidth parameter of one ONU. Here, the downlink of an ONU is fixed in a channel bundle, which is only one wavelength, and its bandwidth allocation is the same as that in the prior art, as described in the ITU-T G.989.3 standard, where the second bandwidth parameter can be It refers to only the upstream bandwidth allocated by an ONU, including the fixed bandwidth Rf_s, the guaranteed bandwidth Ra_s, and the non-guaranteed bandwidth Rna_s.

Optionally, in order to improve the flexibility of the communication, the third embodiment of the channel configuration method of the present invention is proposed based on the second embodiment. In this embodiment, referring to FIG. 12, in the embodiment, the acquiring module 10 is further configured. The second bandwidth parameter corresponding to an ONU in the channel bundle is obtained. The allocation module 30 is further configured to allocate an ONU according to a preset physical channel constraint condition and a second bandwidth parameter corresponding to an ONU. Slot parameter and physical channel information, wherein the time slot parameter packet The time slot ID, the time slot length, and the time slot start position are included; the channel configuration apparatus further includes a sending module 40 configured to send the time slot parameter and the physical channel information to the corresponding ONU, for the ONU to receive based on The physical channel information and the slot parameters transmit data to the OLT.

Referring to Figure 13, the distribution module 30 includes:

The allocating unit 31 is configured to allocate the time slot ID and the time slot length to one ONU according to the second bandwidth parameter corresponding to the one ONU;

The allocating unit 31 is further configured to allocate, according to the physical channel constraint condition corresponding to one physical channel in the channel bundle, a slot ID and a slot length corresponding to one ONU in the channel bundle to corresponding Physical channel

The setting unit 32 is configured to set a slot start position of an ONU in the corresponding physical channel.

Then, according to the actual bandwidth constraint condition of the physical channel, in the physical channel CH scheduler, the slot IDs and corresponding slot lengths that are virtually allocated by all the channel bundles are arranged and combined, and the slot IDs and corresponding slot lengths are allocated. Giving a specific physical channel in the channel bundle, and setting the slot ID and the slot position of the corresponding slot length in the initial position in the uplink frame of the corresponding physical channel.

The input of the physical channel CH scheduler includes: a physical channel constraint condition, a time slot ID allocated by all channel bundles and a corresponding time slot length, and the output includes: a time slot ID, a corresponding physical channel, and a corresponding time thereof. The length of the slot and the location of the time slot on the physical channel, generally using the start bit Set to characterize. The physical channel CH scheduler needs to ensure that all slot IDs and their slot lengths are cleared as much as possible. The physical channel CH scheduler can be easily implemented according to the prior art, such as a simple first in first out (FIFO) stack. Algorithms, etc.

Referring to FIG. 8 , the TWDM PON DBA layer in the OLT allocates the bandwidth of the channel bundle BCT in the system, and specifically allocates the first bandwidth parameter to the channel bundle BCTi of the lower layer. a DBA (i=1, 2...) (Dynamic Bandwidth Assignment) layer, the channel bundle BCTi DBA agent allocates the second bandwidth parameter to the ONU to which the channel bundle belongs, the channel bundle time slot allocator, The ONU is allocated a time slot, that is, an Alloc id, and a time slot length (length) of each Alloc id according to the second bandwidth parameter of the ONU. The Alloc id submitted by all BCTi DBAs and the slot length of each Alloc id will be handed over to the physical channel CH scheduler in the OLT, and the physical channel CH scheduler is responsible for actually performing the slot ID (Alloc id). The physical channel allocation, and its corresponding time slot length and the location of the time slot on the physical channel, are generally characterized by a starting location. According to the result obtained by the physical channel CH scheduler scheduling algorithm, the OLT uses the PON embedded management channel (Embeded OAM) to set the slot ID, the corresponding physical channel, and the corresponding slot length and the slot on the physical channel. The starting position is sent to the ONU.

After receiving the physical channel information, the ONU is based on the number corresponding to the physical channel in the physical signal information (optionally including the number of the uplink channel and the downlink channel, and the combination of the uplink channel number and the downlink channel number is the number of the physical channel) The wavelength corresponding to the uplink channel can be determined, and the channel tuning module in the ONU performs tuning according to the wavelength information, so that the wavelength of the uplink data frame conforms to the uplink channel.

Optionally, in order to improve the efficiency and accuracy of the data transmission, the fourth embodiment of the channel configuration apparatus of the present invention is proposed based on the third embodiment. In this embodiment, the obtaining module 10 is further configured to receive the The data of the same channel bundle is acquired by the ONU when the data is uploaded by the corresponding physical channel. The channel configuration apparatus further includes a convergence module configured to perform aggregation operation on the data of the same channel bundle to restore the data uploaded by the ONU.

As the ONU needs to perform physical channel switching when sending each uplink data frame, the data needs to be aggregated on the OLT. The aggregation operation performed by the aggregation module refers to all data frames sent by the same ONU in the same channel bundle. Re-combining according to the number of transmission points or the number of data frames, that is, an uplink data frame sent by an ONU carries an ONU number, such as a channel bundle label, which is used to indicate the channel bundle where the ONU is located, and the convergence module according to one The number of the ONU is used to aggregate data of the same ONU. Referring specifically to FIG. 9, all TWDM channels in the i-th channel bundle BCTi are aggregated into one virtual BCTi channel bundle port, and the BCTi channel bundle port is an entity externally connected to the TWDM PON multi-channel system. The data of the different channel bundles is identified by the actual TWDM PON physical channel, and then the data of the different channel bundles are distinguished by the BCT identification filter, and the data of the same BCTi channel bundle is aggregated to the corresponding BCTi channel bundle port.

Embodiments of the present invention also provide a computer readable storage medium storing computer executable instructions for performing any of the methods described above.

It is to be understood that the term "comprises", "comprising", or any other variants thereof, is intended to encompass a non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes those elements. It also includes other elements that are not explicitly listed, or elements that are inherent to such a process, method, article, or device. An element that is defined by the phrase "comprising a ..." does not exclude the presence of additional equivalent elements in the process, method, item, or device that comprises the element.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.

Through the description of the above embodiments, those skilled in the art can clearly understand that the foregoing embodiment method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be through hardware, but in many cases, the former is better. Implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the methods described in various embodiments of the present invention.

One of ordinary skill in the art will appreciate that all or part of the steps in the above methods may be passed through the program. The instructions are related to hardware (eg, a processor) that can be stored in a computer readable storage medium, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program in a storage and a memory by a processor. / instruction to achieve its corresponding function. The invention is not limited to any specific form of combination of hardware and software.

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the present invention and the drawings are directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Industrial applicability

The above technical solution reduces the waste of bandwidth, and at the same time makes the channel switching efficiency of the PON network high.

Claims

A channel configuration method, the channel configuration method comprising the following steps:

The optical line terminal OLT acquires each downlink channel and its corresponding multiple uplink channels;

The OLT binds each of the obtained downlink channels and the corresponding multiple uplink channels to one channel bundle, where the downlink channel in the channel bundle is bound to any uplink channel in the channel bundle to form a physical channel. .
The channel configuration method according to claim 1, after the step of the OLT binding each obtained downlink channel and its corresponding multiple uplink channels into one channel bundle, the channel configuration method further includes the steps of:

After registering the optical network unit ONU, the OLT acquires a channel bundle in which the ONU is located;

The OLT allocates a first bandwidth parameter to the channel bundle where the ONU is located, and allocates a second bandwidth parameter to the ONU according to the first bandwidth parameter.
The channel configuration method according to claim 2, after the step of the OLT acquiring the first bandwidth parameter of the channel bundle in which the ONU is located, and assigning the second bandwidth parameter to the ONU according to the first bandwidth parameter, The channel configuration method further includes the steps of:

Obtaining, by the OLT, the second bandwidth parameter corresponding to the ONU in the channel bundle;

The OLT allocates a slot parameter and a physical channel information to the ONU according to a preset physical channel constraint condition and a second bandwidth parameter corresponding to the ONU, where the slot parameter includes a slot ID, a slot length, and a slot. starting point;

The OLT sends the slot parameter and the physical channel information to the corresponding ONU, so that the ONU transmits data to the OLT based on the received physical channel information and the slot parameter.
The channel configuration method according to claim 3, wherein the step of the OLT to allocate the slot parameter and the physical channel information according to the preset physical channel constraint condition and the second bandwidth parameter ONU corresponding to the ONU includes:

The OLT allocates the time slot ID and the time slot length to the ONU according to the second bandwidth parameter corresponding to the ONU;

And assigning, by the OLT, a slot ID and a slot length corresponding to the ONU in the channel bundle to a corresponding physical channel according to the physical channel constraint condition corresponding to the physical channel in the channel bundle, and setting The ONU is in the slot start position in the corresponding physical channel.
The channel configuration method according to claim 3, wherein the OLT transmits the slot parameter and the physical channel information to the corresponding ONU, so that the ONU transmits to the OLT based on the received physical channel information and the slot parameter. After the step of data, the channel configuration method further includes the steps of:

The OLT acquires data of the same channel bundle when receiving data uploaded by the ONU through its corresponding physical channel;

The OLT performs a convergence operation on data of the same channel bundle to restore data uploaded by the ONU.
A channel configuration device, the channel configuration device comprising:

Obtaining a module, configured to acquire each downlink channel and corresponding ones of the uplink channels;

The binding module is configured to bind each obtained downlink channel and its corresponding multiple uplink channels into one channel bundle, where the downlink channel in the channel bundle is bound to any uplink channel in the channel bundle Form a physical channel.
The channel configuration apparatus according to claim 6, wherein the acquiring module is further configured to acquire a channel bundle in which the ONU is located after registering the optical network unit ONU; the channel configuration apparatus further includes an allocation module, configured to Allocating a first bandwidth parameter to the channel bundle where the ONU is located, and allocating a second bandwidth parameter to the ONU according to the first bandwidth parameter.
The channel configuration apparatus according to claim 7, wherein the obtaining module is further configured to acquire the second bandwidth parameter corresponding to an ONU in the channel bundle;

The allocation module is further configured to allocate a slot parameter and a physical channel information to the ONU according to a preset physical channel constraint condition and a second bandwidth parameter corresponding to an ONU, where the slot parameter includes a slot ID and a slot. Length and time slot start position;

The channel configuration apparatus further includes a transmitting module configured to send the slot parameter and the physical channel information to the corresponding ONU, so that the ONU transmits the data to the OLT based on the received physical channel information and the slot parameter. .
The channel configuration apparatus of claim 8, wherein the allocation module comprises:

The allocating unit is configured to allocate the time slot ID and the time slot length to one of the ONUs according to the second bandwidth parameter corresponding to the ONU;

The allocating unit is further configured to allocate, according to the physical channel constraint condition corresponding to the physical channel in the channel bundle, a slot ID and a slot length corresponding to an ONU in the channel bundle to a corresponding physical channel;

The setting unit is configured to set a start position of the time slot of the ONU in the corresponding physical channel.
The channel configuration apparatus according to claim 8, wherein the acquiring module is further configured to acquire data of the same channel bundle when receiving data uploaded by the ONU through the corresponding physical channel; the channel configuration apparatus further includes convergence The module is configured to perform aggregation operation on data of the same channel bundle to restore data uploaded by the ONU.