CN104639467B - A kind of bandwidth allocation methods, device and optical network system - Google Patents

Abstract

The embodiment of the present invention discloses a bandwidth allocation method, device and optical network system, which relate to the field of wireless communication, wherein the above-mentioned bandwidth allocation method is applied to the optical network terminal OLT in the optical network system, including: receiving the target group in the current cycle According to the bandwidth requirement information, according to the preset algorithm, select the modulation format of the ONU contained in the target community from the preset multiple modulation formats; determine the available bandwidth according to the selected modulation format and physical bandwidth; According to the bandwidth requirements of the target community and the determined available bandwidth, allocate bandwidth to each ONU in the target community; according to the above-mentioned bandwidth allocated to each ONU in the target community, allocate services of different service levels to each ONU subcarriers and time slots. Applying the solutions provided by the embodiments of the present invention can meet the bandwidth requirements of the ONUs of each community for different services, and improve user experience.

Description

A bandwidth allocation method, device and optical network system

technical field

The invention relates to the field of wireless communication, in particular to a bandwidth allocation method, device and optical network system.

Background technique

With the rapid development of wireless communication technology, the customer base is getting larger and larger, and the services provided by service providers to customers are also becoming more and more abundant. However, due to the different business content of various services, various services have different requirements on bandwidth.

In the prior art, when carrying out wireless communication, because OLT (Optical Line Terminal, Optical Network Terminal) selects the modulation format for ONU (Optical Network Unit, Optical Network Unit), factors such as bandwidth requirements of ONU will not be considered, so based on The available bandwidth determined by the modulation format selected by the OLT may not be able to meet the bandwidth requirements of the ONU when allocating bandwidth to the ONU. In particular, when the current service data sent by the ONU to the OLT has a large demand for bandwidth, there may be insufficient bandwidth. situation, thereby affecting the user experience.

Contents of the invention

The embodiment of the invention discloses a bandwidth allocation method, device and optical network system, so as to meet the bandwidth requirements of each ONU for different services and improve user experience.

To achieve the above object, the embodiment of the present invention discloses a bandwidth allocation method, which is applied to an optical network terminal OLT in an optical network system, wherein the optical network system includes: an OLT and a first preset number of communities, each Contain at least one optical network unit ONU in a community, described method comprises:

Receive bandwidth demand information of the target community in the current cycle;

According to the bandwidth requirement information, according to a preset algorithm, select the modulation format of the ONU contained in the target community from a plurality of preset modulation formats;

Determine the available bandwidth according to the selected modulation format and physical bandwidth;

Allocating bandwidth to each ONU in the target community according to the bandwidth requirements of the target community and the determined available bandwidth;

According to the above-mentioned bandwidth allocated to each ONU in the target community, subcarriers and time slots are allocated to services of different service levels of each ONU.

In a specific implementation of the present invention, according to the bandwidth requirement information, according to a preset algorithm, the modulation format of the ONU contained in the target community is selected from a variety of preset modulation formats, including:

According to the bandwidth requirement information, calculate the cost factor corresponding to the ONU contained in the target community under each preset modulation format, wherein the cost factor is used to indicate that the ONU contained in the target community adopts the current modulation format Estimated cost value when modulation is performed;

The preset modulation format corresponding to the smallest cost factor is selected as the modulation format of the ONUs included in the target community.

In a specific implementation of the present invention, according to the bandwidth requirement information, according to a preset algorithm, the cost factor corresponding to the ONU contained in the target community under each preset modulation format is calculated respectively, including:

According to the bandwidth requirement information, calculate the cost factor corresponding to the ONU contained in the target community under each preset modulation format according to the following expression,

cost factor

Wherein, i represents the cycle number of the current cycle, j represents the logo of the preset modulation format, l represents the distance between the OLT and the target community, Indicates the delay weight coefficient of the i-th cycle, Indicates the power weight coefficient of the i-th period,

rtv_τ _i,l is the ratio between the delay of the first class of service CoS ₀ in the i-1th period and the average delay of CoS ₀ in the previous i-1 period, rtv_b _i,l is the target community The ratio between the sum of the bandwidth requirements of CoS ₀ of all ONUs in the bandwidth requirement of the i-th period and the average bandwidth requirement of CoS ₀ in the previous i period, rtv_p _i,l is the i-th period under the preset bit error rate The ratio between the received power required for -1 cycle and the average received power of the previous i-1 cycles,

τ _j,l represents the time delay of CoS ₀ for the modulation format identified as j under the distance l between the OLT and the target community, and p _j,l represents the time delay between the OLT and the target community Under the distance l between, for the modulation format identified as j, the required receiving power under the preset bit error rate,

f() is the mapping function about τ _j,l , and g() is the mapping function about p _j,l .

In a specific implementation of the present invention,

Wherein, n represents the number of available modulation formats of the target community at a distance l between the OLT and the target community.

In a specific implementation of the present invention, according to the above-mentioned bandwidth allocated for each ONU in the target community, subcarriers and time slots are allocated for the services of different service levels of each ONU, including:

According to the above-mentioned bandwidth allocated for each ONU in the target community, in the following manner, subcarriers and time slots are allocated for the services of different service levels of each ONU:

According to the traffic volume of CoS ₀ in the next cycle in the bandwidth requirement information, allocate subcarriers and time slots for the CoS ₀ business of the target ONU;

According to the estimated CoS ₁ business volume recorded in the report package of the current period, allocate subcarriers and time slots for the CoS ₁ business transmitted by the target ONU in the idle time of the next cycle, wherein the estimated CoS ₁ business The traffic volume is: the traffic volume calculated according to the traffic volume of the CoS ₁ business generated in every two adjacent report packet intervals in the first second preset number of cycles;

According to the traffic volume of the remaining CoS ₁ business recorded in the report package of the current cycle, allocate subcarriers and time slots for the CoS ₁ business transmitted by the target ONU in the current cycle, wherein, the traffic volume of the remaining CoS ₁ business=target ONU The total traffic volume of CoS ₁ services buffered in the current cycle - the traffic volume of CoS ₁ services to be sent in the pre-allocated CoS ₁ sub-cycle recorded in the gate packet of the previous cycle, a cycle includes: CoS ₁ /CoS ₂ sub-cycle , CoS ₀ sub-cycle and pre-allocated CoS ₁ sub-cycle;

According to the traffic volume of the third class of service CoS ₂ in the current cycle, allocate subcarriers and time slots for the CoS ₂ business of the target ONU.

In a specific implementation manner of the present invention, the traffic volume calculated according to the traffic volume of the CoS ₁ business generated in every two adjacent report packet intervals in the first second preset number of cycles includes:

According to the traffic volume of the CoS ₁ service generated in every two adjacent report packet intervals in the first second preset number of cycles, the traffic volume obtained by calculating the average value of the traffic volume of each CoS ₁ service mentioned above.

To achieve the above object, the embodiment of the present invention discloses a bandwidth allocation device, which is applied to an optical network terminal OLT in an optical network system, wherein the optical network system includes: an OLT and a first preset number of communities, each Contain at least one optical network unit ONU in a community, and described device comprises:

The bandwidth demand information receiving module is used to receive the bandwidth demand information of the target community in the current cycle;

A modulation format selection module, configured to select the modulation format of the ONU contained in the target community from a plurality of preset modulation formats according to the bandwidth requirement information and according to a preset algorithm;

an available bandwidth determination module, configured to determine the available bandwidth according to the selected modulation format and physical bandwidth;

A bandwidth allocation module, configured to allocate bandwidth to each ONU in the target community according to the bandwidth requirements of the target community and the determined available bandwidth;

The subcarrier and time slot allocation module is configured to allocate subcarriers and time slots for services of different service levels of each ONU according to the bandwidth allocated to each ONU in the target community.

In order to achieve the above purpose, an embodiment of the present invention discloses an optical network system, the optical network system includes:

OLT, optical cable equipment ODN and a fourth preset number of communities;

The ODN includes a plurality of optical splitters, wherein the number of optical splitters is equal to the number of communities;

The OLT communicates with each community through each optical splitter in the ODN;

Each community contains at least one sub-community;

Each sub-community contains an active remote node ARN and at least one ONU respectively communicating with it;

The ARNs contained in each sub-community in the same group communicate with the OLT through the same optical splitter; each sub-community in the same group communicates with the OLT through a sub-carrier of the same wavelength;

The OLT receives the bandwidth requirement information of the target community in the current cycle, and selects the modulation format of the ONU contained in the target community from a plurality of preset modulation formats according to the bandwidth requirement information and according to a preset algorithm, Determine the available bandwidth according to the selected modulation format and physical bandwidth, allocate bandwidth to each ONU in the target community according to the bandwidth requirements of the target community and the determined available bandwidth, and allocate bandwidth for the target community according to the above In the bandwidth allocated by each ONU, subcarriers and time slots are allocated for the services of different service levels of each ONU;

Each ONU sends services of different service levels to the OLT according to the bandwidth allocated to it by the OLT.

In a specific implementation of the present invention, a cycle includes: CoS ₁ /CoS ₂ sub-cycle, CoS ₀ sub-cycle and pre-allocated CoS ₁ sub-cycle;

The ONUs are specifically used to send their corresponding CoS ₁ /CoS ₂ services to the OLT in the CoS ₁ /CoS ₂ sub-period;

Each ONU sends its corresponding CoS ₀ service to the OLT in the CoS ₀ sub-cycle, wherein the CoS ₀ service sent by each ONU is: the service of CoS ₀ in the next cycle;

Each ONU sends its corresponding service to the OLT in the pre-allocated CoS ₁ sub-period, wherein the service sent by each ONU is: the estimated service volume of the CoS ₁ service and the fifth preset number of subcarriers that can send services The minimum value between the business volumes, the estimated CoS ₁ business volume is: the traffic volume calculated according to the CoS ₁ business volume generated in the adjacent report packet interval in the first sixth preset number of cycles .

In a specific implementation of the present invention, each ONU is further used to detect whether the space for buffering CoS ₀ services is full, and if the space for buffering CoS ₀ services is full, then detects whether the space for buffering CoS 0 services is full. Whether the space for the CoS ₂ service is full, if the space for caching the CoS ₂ service is not full, store the CoS ₀ service in the space for caching the CoS ₂ service.

As can be seen from the above, in the solution provided by the embodiment of the present invention, the OLT selects a modulation format for the ONU contained in the target community according to the received bandwidth demand information of the target community in the current cycle, and then determines the available bandwidth, and according to the determined available bandwidth Allocate bandwidth for each ONU in the target community. Compared with the prior art, in the solution provided by the embodiments of the present invention, when allocating bandwidth for each ONU in the target community, the bandwidth requirement information of the target community is considered, and according to the different bandwidth requirements of the target community, each ONU in the community The ONU selects the same better modulation format to obtain different available bandwidths, which meets the bandwidth requirements of the ONUs of each community in different situations and improves user experience.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of an optical network system in the prior art;

FIG. 2 is a schematic structural diagram of an optical network system provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an optical network system provided by an embodiment of the present invention;

FIG. 4 is a schematic flowchart of a bandwidth allocation method provided by an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of a bandwidth allocation device provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

As is well known to those skilled in the art, for various optical network systems, there is usually a phenomenon that the geographical location of users is unevenly distributed. If the distance between users is far away, it cannot be guaranteed that users within a certain distance can access the same optical network. In the system, in order to ensure the quality of communication in practical applications, operators usually need to establish multiple optical network systems. However, the cost of establishing an optical network system is relatively high. Therefore, it is necessary to construct a new type of optical network system to Distribution characteristics, providing communication services for a wide range of users.

In the following, the optical network system provided by the embodiment of the present invention will be introduced by way of comparison with the optical network system in the prior art.

FIG. 1 is a schematic structural diagram of an optical network system in the prior art. The optical network system includes: an OLT 101 , an ODN (Optical Distribution Network, optical cable device) 102 and a community 103 .

Wherein, the group 103 includes several ONUs, the number of ONUs can be determined according to the actual situation, the ODN 102 includes a plurality of optical splitters, and the OLT 101 communicates with each ONU in the group 103 through each optical splitter in the ODN 102 Communication connection, specifically, each ONU is in communication connection with a preset optical splitter in the ODN 102 through an optical fiber.

Usually, each ONU and ODN 102 carry out communication connection and the quantity of optical fiber that needs is equal to the quantity of the ONU that comprises in community 103, thus can be seen, along with the increase of ONU quantity in community 103, the quantity of required optical fiber increases, with The cost of constructing an optical network system will also be greatly increased.

In addition, the OLT 101 also allocates bandwidth to each ONU in the cluster 103 and sends bandwidth allocation information to the corresponding ONU, so that each ONU sends services of different service levels to the OLT 101 according to the bandwidth allocated by the OLT 101 .

Based on the above description, those skilled in the art can easily know that the above-mentioned optical network system only includes one community, and the service range of each ONU in the community is generally small, so the service range of the above-mentioned optical network system Generally small, when applying this system, if you want to ensure the communication quality of users in a wide range, you can only realize it by building multiple optical network systems.

In order to solve the above-mentioned problems existing in the existing optical network system, an embodiment of the present invention provides a new type of optical network system, see FIG. 2, which is a schematic structural diagram of an optical network system provided by an embodiment of the present invention. The optical network system includes:

OLT 201, ODN 202 and a fourth preset number of communities: community 1, community 2, . . . , community (N−1), community N.

It should be noted that each community included in this embodiment may correspond to different service ranges, that is, it can be understood as: the distance between each community and the OLT is different, and it can be further understood that the ONUs contained in each community and the The distances between the OLTs are equal or approximately equal, and the distances between the ONUs contained in different communities and the OLTs are different.

Wherein, the ODN 202 includes a plurality of optical splitters, and the number of optical splitters is equal to the number of clusters, that is, the number of optical splitters is equal to the fourth preset number.

The OLT 201 communicates with each community through each optical splitter in the ODN 202. Each community in the system can correspond to a different service range. It can be simply understood as: each community can be at a different distance from the OLT 201. Users within a certain range can provide communication services. For example, a certain group can provide communication services for users whose distance from OLT 201 is within a range of 10km, and a certain group can provide communication services for users whose distance between OLT 201 is within a range of 40km. communication services and more. Since the service ranges corresponding to each community are different, when constructing the optical network system, the distribution characteristics of users can be considered, and the service range and the number of the communities in the optical network system can be set according to the actual situation. For example, when the optical network system is required to provide communication services for users in a wide range in practical applications, 4, 8 or even 10 communities can be set up, and different service ranges can be set for each community, such as: for OLT 201 Provide communication services to users whose distance is within 10km, provide communication services to users whose distance from OLT 201 is within 40km, provide communication services to users whose distance from OLT 201 is within 100km, etc. In this way, users who are far away from the OLT 201 can also successfully communicate through the optical network system without building multiple optical network systems, which can greatly save construction costs.

In addition, the service ranges corresponding to the above-mentioned communities are generally relatively large. In the optical network system provided in this embodiment, each community may contain at least one sub-community, and the number of sub-communities included in each community may be equal or may be Not equal, this application does not limit it, for example, the number of sub-communities included in a community can be 4, 5, 8 and so on.

Each sub-community corresponds to a further refined service scope based on the service scope of its corresponding community. Assuming that a community contains 4 sub-communities, and the community can provide communication services for users whose distance from the OLT 201 is within 10 km, then the 4 sub-communities included in it can be represented as distances from the OLT 201 within Provide communication services for users within a range of 3km, provide communication services for users within the range of [3km, 5km] from the OLT 201, and provide communication services for users within the range of [5km, 8km] from the OLT 201 The communication service provides communication services for users whose distance from the OLT 201 is within the range of [8km, 10km]. The present application is only described by taking the above as an example, and the specific implementation is not limited to the above cases.

In addition, when dividing sub-communities, while considering the service range, the distance between ONUs can also be considered. When the distance between each ONU and OLT is equal or approximately equal, and the distance between each ONU is relatively long, you can use These ONUs are divided into different sub-communities respectively.

Each of the above-mentioned sub-communities may contain an ARN (Active Remote Node, active remote node) and at least one ONU connected to it in communication respectively, wherein the number of ONUs contained in each sub-community can be determined according to specific conditions For example, according to the distribution of users, the activity level of users, etc., the number of ONUs contained in each sub-community may be equal or unequal, which is not limited in this application. For example, a sub-community may include an ARN and seven ONUs respectively communicating with the ARN: ONU ₁ , ONU ₂ , . . . , ONU ₇ .

The ARNs contained in each sub-community in the same community communicate with the OLT 201 through the same optical splitter; each sub-community in the same community communicates with the OLT 201 through sub-carriers of the same wavelength.

Specifically, the ARNs contained in each sub-community can communicate with an optical splitter through optical fibers. After the OLT201 sends the information to the ARN through the optical splitter and through the optical fiber, the ARN forwards the received information to its respective Corresponding to each ONU. Here, only one optical fiber is needed between an ARN and an optical splitter, which can be further understood as: only one optical fiber is needed between a sub-community and an optical splitter, which is different from that between each ONU and an optical splitter in the prior art. Compared with the need for one optical fiber between each optical splitter, the above-mentioned system can greatly save the number of optical fibers. At the same time, due to the reduction in the number of optical fibers, the transmission loss can be reduced during the transmission process. Especially for long-distance transmission, the above-mentioned system can reduce the transmission loss. The effect is more obvious.

In the above optical network system, the OLT 201 can receive bandwidth requirement information sent by a certain community, and allocate bandwidth to each ONU in the community according to the received bandwidth requirement information.

Specifically, the OLT 201 receives the bandwidth requirement information of the target community in the current cycle, selects the modulation format of the ONU contained in the target community from a variety of preset modulation formats according to the above bandwidth requirement information, and according to a preset algorithm, according to The selected modulation format and physical bandwidth determine the available bandwidth, allocate bandwidth to each ONU in the target community according to the bandwidth requirements of the target community and the determined available bandwidth, and allocate bandwidth to each ONU in the target community according to the above Bandwidth, which allocates subcarriers and time slots for the services of different service levels of each ONU.

In this system, after the OLT 201 allocates bandwidth to each ONU in the cluster, it sends the bandwidth allocation information to the corresponding ONU, and each ONU sends services of different service levels to the OLT 201 according to the bandwidth allocated to it by the OLT 201 .

In addition, in the process of allocating bandwidth for each ONU, OLT 201 selects a modulation format for the ONUs contained in the target community according to the bandwidth demand information of the target community in the current cycle, instead of using the agreed modulation format. Therefore, OLT 201 needs to use its The selected modulation format information is sent to the corresponding ONU. In a specific implementation manner, the OLT 201 can identify the modulation format of the ONU contained in the target community with a third preset number of bytes in the gate packet of the current cycle, for example, use 1 byte to identify the modulation format of the ONU contained in the target community. The modulation format of the ONU, so that the ONU included in the target community obtains the modulation format by analyzing the received gate packet of the current period. At the same time, the ONUs contained in the target community can add a third preset number of bytes to identify the modulation format of the ONUs contained in the target community in the data packet of the current cycle, so that the receiving end of the OLT can analyze the received current cycle The data packet obtains the modulation format and performs data demodulation.

Specifically, when the OLT 201 selects the modulation format of the ONU contained in the target community from the preset multiple modulation formats according to the bandwidth requirement information according to the preset algorithm, the OLT 201 can first calculate each The cost factor corresponding to the ONU contained in the target community under the preset modulation format, and then select the preset modulation format corresponding to the smallest cost factor as the modulation format of the ONU contained in the target community. Wherein, the above-mentioned cost factor is used to represent an estimated cost value when the ONUs included in the target community use the current modulation format for modulation.

In a specific implementation of the present invention, when the OLT 201 calculates the cost factors corresponding to the ONUs contained in the target community under each preset modulation format according to the bandwidth requirement information and according to the preset algorithm, it can first calculate the cost factor according to the bandwidth requirement Information, calculate the cost factor corresponding to the ONU contained in the target community under each preset modulation format according to the following expression,

cost factor

Wherein, i represents the cycle number of the current cycle, j represents the logo of the preset modulation format, and l represents the distance between the OLT 201 and the target community, Indicates the delay weight coefficient of the i-th cycle, Indicates the power weight coefficient of the i-th period,

rtv_τ _i,l is the ratio between the delay of the first class of service CoS ₀ in the i-1th period and the average delay of CoS ₀ in the previous i-1 period, rtv_b _i,l is the first The ratio between the sum of the bandwidth requirements of CoS ₀ of all ONUs in the bandwidth requirement of cycle i and the average bandwidth requirement of CoS ₀ in the previous i cycle, rtv_p _i,l is the i-1th under the preset bit error rate The ratio between the received power required for the cycle and the average received power of the previous i-1 cycles,

τ _j,l represents the time delay of CoS ₀ for the modulation format identified as j under the distance l between the OLT 201 and the target community, p _j,l represents the distance l between the OLT 201 and the target community, For the modulation format identified as j, the required receiving power under the preset bit error rate,

f() is the mapping function about τ _j,l , and g() is the mapping function about p _j,l .

Wherein, the preset bit error rate may be a value preset according to specific application conditions.

specific,

where n represents the number of available modulation formats for the target community at a distance l between the OLT and the target community.

In a preferred embodiment of the present invention, when the OLT 201 allocates subcarriers and time slots for the services of different service levels of each ONU according to the above-mentioned bandwidth allocated for each ONU in the target community, the OLT 201 can According to the above-mentioned bandwidth allocated for each ONU in the target community, subcarriers and time slots are allocated for the services of different service levels of each ONU in the following manner:

According to the traffic volume of CoS ₀ in the next cycle in the bandwidth demand information, allocate subcarriers and time slots for the CoS ₀ business of the target ONU;

According to the estimated CoS ₁ business volume recorded in the report packet of the current period, allocate subcarriers and time slots for the CoS ₁ business transmitted by the target ONU in the idle time of the next cycle, wherein the estimated CoS ₁ business The traffic volume is: the traffic volume calculated according to the traffic volume of the CoS ₁ business generated in every two adjacent report packet intervals in the first second preset number of cycles;

According to the remaining CoS ₁ service volume recorded in the report package of the current period, allocate subcarriers and time slots for the CoS ₁ service transmitted by the target ONU in the current period, wherein, the remaining CoS ₁ service volume = the target ONU in the current period The total traffic volume of CoS ₁ services cached in the cycle - the traffic volume of CoS ₁ services to be sent in the pre-allocated CoS ₁ sub-cycle recorded in the gate packet of the previous cycle. A cycle includes: CoS ₁ /CoS ₂ sub-cycle, CoS ₀ subcycle and pre-allocated CoS ₁ subcycle;

According to the traffic volume of the third class of service CoS ₂ in the current cycle, allocate subcarriers and time slots for the CoS ₂ business of the target ONU.

Specifically, the estimated traffic volume of CoS ₁ service may be: according to the traffic volume of CoS ₁ business generated in the adjacent report packet interval in the first sixth preset number of periods, calculate the traffic volume of each CoS ₁ business mentioned above The business volume obtained by the average value of .

In another preferred implementation manner of the present invention, a cycle may include: a CoS ₁ /CoS ₂ sub-cycle, a CoS ₀ sub-cycle and a pre-allocated CoS ₁ sub-cycle.

Specifically, the above-mentioned ONUs are specifically used to send their corresponding CoS ₁ /CoS ₂ services to the OLT 201 in the CoS ₁ /CoS ₂ sub-period;

Each ONU sends its corresponding CoS ₀ service to the OLT 201 in the CoS ₀ sub-cycle, wherein, the CoS ₀ service sent by each ONU is: the service of CoS ₀ in the next cycle;

Each ONU sends its corresponding service to the OLT 201 in the pre-allocated CoS ₁ subperiod, wherein, the service sent by each ONU is: the estimated service volume of the CoS ₁ service and the fifth preset number of subcarriers that can send services The minimum value among the business volumes, the estimated business volume of the CoS ₁ service is: the traffic volume calculated according to the business volume of the CoS ₁ business generated in the adjacent report packet interval in the first sixth preset number of cycles.

Since the CoS ₀ service sent by each ONU to the OLT 201 in the CoS ₀ sub-cycle is: the service of CoS ₀ in the next cycle, the service sent to the OLT 201 in the pre-allocated CoS ₁ sub-cycle is: the estimated CoS ₁ service Therefore, for subsequent CoS ₀ services and some CoS ₁ services, the OLT 201 no longer needs to wait for the gate packet, thereby reducing system delay.

Specifically, the estimated traffic volume of CoS ₁ service may be: according to the traffic volume of CoS ₁ business generated in the adjacent report packet interval in the first sixth preset number of periods, calculate the traffic volume of each CoS ₁ business mentioned above The business volume obtained by the average value of .

Optionally, the above-mentioned fifth preset number can be 2, then the business sent by each ONU can be: the average traffic volume of the CoS ₁ business generated in the adjacent report packet interval in the first sixth preset number of cycles and 2 The minimum value between the traffic volumes that can be transmitted by subcarriers.

Each ONU side has space for buffering services of different service levels. In addition, as is well known to those skilled in the art, CoS ₀ services have the highest priority, and the loss of CoS ₀ service data often seriously affects the communication quality. Therefore, in order to prevent users from using When the cache space for storing _{CoS 0} services is full, the data of CoS ₀ services will be lost and the communication quality will be affected. In another specific embodiment of the present invention, each ONU is further used to detect the Whether the space for caching the CoS 0 service is full, if the space for caching the CoS ₀ service is full, check whether the space for caching the CoS ₂ service is full, if the space for caching the CoS ₂ service is not full, then store the CoS ₀ service To the space used for caching CoS ₂ traffic.

In the above-mentioned specific implementation, when the space for buffering CoS ₀ services is full, each ONU buffers CoS ₀ services to the space for buffering CoS ₂ services, so, in order to prevent each ONU from sending data from Corresponding to an error in accessing the buffer space, when the above-mentioned situation of caching the CoS ₀ service to the space for caching the CoS ₂ service occurs, a certain number of bits may be used to indicate that the above-mentioned situation has occurred.

It can be seen from the above that the optical network system provided by this embodiment includes multiple communities, and each community can correspond to a different service range. Therefore, compared with the optical network system in the prior art that only includes one community, this implementation The optical network system provided by the example can provide communication services for users in a wider range.

The optical network system provided by the embodiment of the present invention will be described in detail below through a specific example.

FIG. 3 is a schematic diagram of a specific structure of an optical network system provided by an embodiment of the present invention.

The optical network system includes: OLT 301 , ODN 302 , community 1 , community 2 , community 3 and community 4 .

Among them, the service ranges corresponding to community 1 to community 4 are: 10km, 40km, 70km and 100km respectively.

The ODN 302 includes four optical splitters, optical splitter 1 , optical splitter 2 , optical splitter 3 and optical splitter 4 .

Community 1 contains 4 sub-communities: sub-community 1, sub-community 2, sub-community 3, sub-community 4;

Community 2 contains 4 sub-communities: sub-community 5, sub-community 6, sub-community 7, sub-community 8;

Community 3 contains 4 sub-communities: sub-community 9, sub-community 10, sub-community 11, sub-community 12;

Community 4 contains 4 sub-communities: sub-community 13, sub-community 14, sub-community 15, and sub-community 16.

The sub-community 16 includes ONU1, ONU2, ONU3, and ARN, and ONU1, ONU2, and ONU3 are respectively connected to the ARN by communication.

The specific structure of the sub-community 1 to the sub-community 15 can be completely the same as that of the sub-community 16, and will not be repeated here.

OTL 301 is communicatively connected to cluster 1 through optical splitter 1 , communicatively connected to cluster 2 through optical splitter 2 , communicatively connected to cluster 3 through optical splitter 3 , and communicatively connected to cluster 4 through optical splitter 4 .

Specifically, the ARNs in sub-community 1 to sub-community 4 included in community 1 communicate with OLT 301 through optical splitter 1, and these four sub-communities share 2 ^q on one wavelength realized through optical splitter 1. subcarriers, where q is an integer greater than 0, for example, 2 ^q can be 64, 256, etc.;

The ARNs in sub-community 5 to sub-community 8 included in community 2 are communicatively connected to OLT 301 through optical splitter 2, and these four sub-communities share 2 ^q subcarriers on one wavelength realized through optical splitter 2;

The ARNs in sub-community 9 to sub-community 12 contained in community 3 communicate with OLT 301 through optical splitter 3, and these four sub-communities share 2 ^q subcarriers on one wavelength realized through optical splitter 3;

The ARNs in sub-community 13 to sub-community 16 included in community 4 are communicatively connected to OLT 301 through optical splitter 4 , and these four sub-communities share 2 ^q subcarriers on one wavelength realized through optical splitter 4 .

The OLT 301 can allocate bandwidth, sub-carriers and time slots to the ONUs in each sub-community included in the cluster 1 to cluster 4 .

The ONUs in each sub-community contained in the cluster 1 to the cluster 4 can send services of different service levels to the OLT 301 .

It can be seen from the above that no matter it is the optical network system in the prior art or the new optical network system provided by the embodiment of the present invention, the OLT needs to allocate bandwidth for each ONU. Therefore, the embodiment of the present invention provides a bandwidth allocation method.

Referring to FIG. 4, FIG. 4 is a schematic flowchart of a bandwidth allocation method provided by an embodiment of the present invention. The method is applied to an optical network terminal OLT in an optical network system, wherein the above-mentioned optical network system includes: OLT and a first preliminary There are a number of communities, and each community includes at least one optical network unit (ONU).

It should be noted that, the above-mentioned first preset number≥1.

That is to say, the bandwidth allocation method provided by the embodiment of the present invention can be applied to: OLTs in all optical network systems including OLTs and clusters, wherein the clusters in the optical network system include at least one ONU, when the optical network system includes multiple When there are several communities, the number of ONUs included in each community may be equal or not, and this application does not limit this.

The bandwidth allocation methods mentioned above include:

S401: Receive bandwidth requirement information of a target community in a current period.

In this step, the target community may be a community contained in the optical network system in the prior art, or one of the multiple communities contained in the optical network system provided by the embodiment of the present invention.

Specifically, the above-mentioned bandwidth requirement information may include information such as the traffic volume of services under different service levels that each ONU in the target community will send to the OLT.

CoS (Class of Service, Class of Service) is a method of managing network paths by grouping similar classes. For each category, it has its own level and priority. CoS is generally divided into three categories, denoted as: CoS ₁ , CoS ₂ and CoS ₃ .

S402: According to the above bandwidth requirement information, according to a preset algorithm, select a modulation format of the ONU included in the target community from a plurality of preset modulation formats.

Wherein, the preset modulation format may include: BPSK (Binary Phase Shift Keying, binary phase shift keying), QPSK (Quadrature Phase Shift Keying, quadrature phase shift keying), 16QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation), 32QAM and so on.

In an optional embodiment of the present invention, according to the above bandwidth requirement information, according to a preset algorithm, when selecting the modulation format of the ONU contained in the target community from a variety of preset modulation formats, the bandwidth requirement Information, respectively calculate the cost factor corresponding to the ONU contained in the target community under each preset modulation format, and then select the preset modulation format corresponding to the smallest cost factor from the results as the modulation format of the ONU contained in the target community.

Wherein, the cost factor is used to represent the estimated cost value when the ONUs included in the target community are modulated by the current modulation format.

Specifically, when calculating the cost factors corresponding to the ONUs contained in the target community under each preset modulation format according to the preset algorithm according to the bandwidth requirement information, each type can be calculated respectively according to the bandwidth requirement information according to the following expression The cost factor corresponding to the ONU contained in the target community under the preset modulation format,

cost factor

Among them, i represents the cycle number of the current cycle, j represents the logo of the preset modulation format, l represents the distance between the OLT and the target community, Indicates the delay weight coefficient of the i-th cycle, Indicates the power weight coefficient of the i-th period,

rtv_τ _i,l is the ratio between the delay of the first class of service CoS ₀ in the i-1th period and the average delay of CoS ₀ in the previous i-1 period, rtv_b _i,l is the first The ratio between the sum of the bandwidth requirements of CoS ₀ of all ONUs in the bandwidth requirement of cycle i and the average bandwidth requirement of CoS ₀ in the previous i cycle, rtv_p _i,l is the i-1th under the preset bit error rate The ratio between the received power required for the cycle and the average received power of the previous i-1 cycles,

τ _j,l represents the time delay of CoS ₀ for the modulation format identified as j under the distance l between the OLT and the target community, and p _j,l represents the time delay of CoS 0 under the distance l between the OLT and the target community. is the modulation format of j, the required receiving power under the preset bit error rate,

f() is the mapping function about τ _j,l , and g() is the mapping function about p _j,l .

These two mapping functions are mainly to normalize τ _j,l and p _j,l .

optional,

where n represents the number of available modulation formats for the target community at a distance l between the OLT and the target community.

It should be noted that this application only uses the above as an example for illustration, and other normalization functions similar to the above mapping function may also be used in practical applications.

The above-mentioned modulation format selection algorithm comprehensively considers various factors of the physical layer and the MAC (Media Access Control, Media Access Control) layer. Specifically, these factors include: baseband rate, transmission distance of ONU, optical splitting ratio, and allowable receiving bit error Rate, modulation format, energy consumption, network load and delay, among them, the first three factors are fixed for a certain ONU, and the allowable receiving bit error rate can be preset according to specific application conditions, so, for a certain ONU For optical networks, the modulation format and energy consumption need to be considered in the physical layer, and the network load and delay need to be considered in the MAC layer. The modulation format directly affects the transmission rate of physical layer parameters, and then affects the transmission quality of services, that is, the average delay of services and the uplink access bandwidth. In addition, there is also a relationship between the modulation format and energy consumption, and the network load affects which modulation format is used. It can be seen that these factors restrict and influence each other.

It should be noted that for a transmission link with a certain length, the transmission loss of the entire link from the transmitting end to the receiving end is fixed, so the received power is a factor that affects energy consumption, namely: energy consumption and reception The received power of the terminal is related, therefore, the above energy consumption can be represented by the received power.

Through the above analysis, it can be seen that the modulation format can relate the network load, delay and received power, thus linking the parameters that need to be considered in the physical layer and the MAC layer.

S403: Determine the available bandwidth according to the selected modulation format and physical bandwidth.

It should be noted that in practical applications, the bandwidth may be represented by a bit rate or a baud rate. In this embodiment, the bandwidth is represented by a bit rate.

S404: Allocate bandwidth to each ONU in the target community according to the bandwidth requirement of the target community and the determined available bandwidth.

The specific algorithm for allocating bandwidth for each ONU in the target community is a relatively mature technology, and can be easily obtained by those skilled in the art based on professional knowledge.

An optional specific algorithm for allocating bandwidth to each ONU in the target community is listed below, and the algorithm includes:

In the case that the service level is divided into three types: CoS ₁ , CoS ₂ and CoS ₃ , the requested bandwidth of any ONU in the bandwidth demand of the target community in the current cycle It can be expressed as: Among them, i represents the identity of the ONU in the target community, and j represents the service level.

Allocate guaranteed bandwidth to each ONU before allocating bandwidth to each ONU in the target community Wherein, the guaranteed bandwidth is the bandwidth allocated to the ONU according to the current available bandwidth without considering the traffic to be sent by the ONU.

It can be understood that, usually, among the ONUs in the target community, some ONUs need to send a small amount of traffic, and the other While other ONUs need to send a large amount of business, the Based on the above two situations, when the amount of business that the ONU needs to send is small, the cumulative remaining bandwidth will be generated in, M means that in the target group At this time, the cumulative remaining bandwidth can be allocated to ONUs that need to send a large amount of traffic to ensure the communication quality of these ONUs.

Based on the above description, the bandwidth allocated for each ONU in the target community It can be expressed as:

in, Indicates the remaining bandwidth allocated for the ONU identified as i, specifically,

K means A set of ONUs, and k represents the identity of the ONU in the set K.

S405: Allocate subcarriers and time slots for services of different service levels of each ONU according to the bandwidth allocated to each ONU in the target community.

Specifically, according to the above-mentioned bandwidth allocated for each ONU in the target community, subcarriers and time slots can be allocated for the services of different service levels of each ONU in the following manner:

According to the traffic volume of CoS ₀ in the next cycle in the bandwidth demand information, allocate subcarriers and time slots for the CoS ₀ business of the target ONU;

According to the estimated CoS ₁ business volume recorded in the report package of the current period, allocate subcarriers and time slots for the CoS ₁ business transmitted by the target ONU in the idle time of the next cycle, wherein the estimated CoS ₁ business The traffic volume is: the traffic volume calculated according to the traffic volume of the CoS ₁ business generated in every two adjacent report packet intervals in the first second preset number of cycles;

According to the traffic volume of the remaining CoS ₁ business recorded in the report package of the current cycle, allocate subcarriers and time slots for the CoS ₁ business transmitted by the target ONU in the current cycle, wherein, the traffic volume of the remaining CoS ₁ business=target ONU The total traffic volume of CoS ₁ services buffered in the current cycle - the traffic volume of CoS ₁ services to be sent in the pre-allocated CoS ₁ sub-cycle recorded in the gate packet of the previous cycle, a cycle includes: CoS ₁ /CoS ₂ sub-cycle , CoS ₀ sub-cycle and pre-allocated CoS ₁ sub-cycle;

According to the traffic volume of the third class of service CoS ₂ in the current cycle, allocate subcarriers and time slots for the CoS ₂ business of the target ONU.

Optionally, the estimated CoS ₁ service volume may be: according to the CoS ₁ service volume generated in every two adjacent report packet intervals in the previous second preset number of periods, calculate the above-mentioned CoS ₁ services The business volume obtained by the average value of the business volume of the business.

In the process of allocating bandwidth for each ONU in the target community, the OLT selects the modulation format for the ONUs contained in the target community according to the bandwidth demand information of the target community in the current cycle instead of using the agreed modulation format. Therefore, the OLT needs to Send the selected modulation format information to the corresponding ONU. In a preferred embodiment of the present invention, the above bandwidth allocation method, after selecting the modulation format of the ONU contained in the target community from a variety of preset modulation formats according to the bandwidth requirement information and according to the preset algorithm, Also includes;

In the gate packet of the current period, the modulation format of the ONU contained in the target community is identified with a third preset number of bytes, so that the ONU contained in the target community obtains the modulation format by analyzing the received gate packet of the current period.

For example, 1 byte is used to identify the modulation format of the ONU contained in the target community, so that the ONU contained in the target community obtains the modulation format by analyzing the received gate packet of the current period.

Based on the above, in the process of OLT allocating bandwidth to each ONU in the target community, the communication between OLT and ONU in a cycle can be simply described as: OLT assigns the bandwidth requirement information recorded in the report packet of the current cycle to the target community. Each ONU selects the same modulation format, and allocates bandwidth for each ONU according to the selection result, and then allocates subcarriers and time slots for each ONU. After the above steps are completed, the modulation format, allocated bandwidth, and allocated Information such as subcarriers and time slots is written into the gate packet, and sent to each ONU end of the target community, so that each ONU of the target community can communicate with the OLT according to the information contained in the received gate packet.

As can be seen from the above, in the solution provided by this embodiment, the OLT selects a modulation format for the ONUs contained in the target community according to the received bandwidth demand information of the target community in the current cycle, and then determines the available bandwidth, and according to the determined available bandwidth is Each ONU in the target community allocates bandwidth. Compared with the prior art, in the solution provided by this embodiment, when allocating bandwidth for each ONU in the target community, the bandwidth demand information of the target community is considered, and according to the different bandwidth requirements of the target community, each ONU in the community The same better modulation format is selected to obtain different available bandwidths, which satisfies the bandwidth requirements of the ONUs of each community in different situations and improves user experience.

Corresponding to the foregoing bandwidth allocation method, an embodiment of the present invention further provides a bandwidth allocation device.

Fig. 5 is a schematic structural diagram of a bandwidth allocation device provided by an embodiment of the present invention, which is applied to an optical network terminal OLT in an optical network system, wherein the above-mentioned optical network system includes: an OLT and a first preset number of Community, each community includes at least one optical network unit ONU.

The above bandwidth allocation device includes: a bandwidth requirement information receiving module 501 , a modulation format selection module 502 , an available bandwidth determination module 503 , a bandwidth allocation module 504 and a subcarrier and time slot allocation module 505 .

Wherein, the bandwidth demand information receiving module 501 is used to receive the bandwidth demand information of the target community in the current cycle;

The modulation format selection module 502 is configured to select the modulation format of the ONU contained in the target community from a plurality of preset modulation formats according to the bandwidth requirement information and according to a preset algorithm;

An available bandwidth determining module 503, configured to determine the available bandwidth according to the selected modulation format and physical bandwidth;

A bandwidth allocation module 504, configured to allocate bandwidth to each ONU in the target community according to the bandwidth requirements of the target community and the determined available bandwidth;

The subcarrier and time slot allocation module 505 is configured to allocate subcarriers and time slots for services of different service levels of each ONU according to the above-mentioned bandwidth allocated to each ONU in the target community.

In an optional embodiment of the present invention, the modulation format selection module 502 includes: a cost factor calculation submodule and a modulation format selection submodule (not shown in the figure).

Wherein, the cost factor calculation submodule is used to calculate the cost factor corresponding to the ONU contained in the target community under each preset modulation format according to the bandwidth requirement information, wherein the cost factor is used to represent the Estimated cost value when the ONU contained in the above target community adopts the current modulation format for modulation;

The modulation format selection submodule is configured to select the preset modulation format corresponding to the smallest cost factor as the modulation format of the ONUs included in the target community.

Preferably, the above-mentioned cost factor calculation submodule is specifically used to calculate the cost factor corresponding to the ONU contained in the target community under each preset modulation format according to the bandwidth requirement information according to the following expression,

cost factor

Wherein, i represents the cycle number of the current cycle, j represents the logo of the preset modulation format, l represents the distance between the OLT and the target community, Indicates the delay weight coefficient of the i-th cycle, Indicates the power weight coefficient of the i-th period,

rtv_τ _i,l is the ratio between the delay of the first class of service CoS ₀ in the i-1th period and the average delay of CoS ₀ in the previous i-1 period, rtv_b _i,l is the target community The ratio between the sum of the bandwidth requirements of CoS ₀ of all ONUs in the bandwidth requirement of the i-th period and the average bandwidth requirement of CoS ₀ in the previous i period, rtv_p _i,l is the i-th period under the preset bit error rate The ratio between the received power required for -1 cycle and the average received power of the previous i-1 cycles,

τ _j,l represents the time delay of CoS ₀ for the modulation format identified as j at the distance l between the OLT and the target community, and p _j,l represents the distance l between the OLT and the target community Next, for the modulation format identified as j, the required receiving power under the preset bit error rate,

f() is the mapping function about τ _j,l , and g() is the mapping function about p _j,l .

specific,

Wherein, n represents the number of available modulation formats of the target community at a distance l between the OLT and the target community.

In a specific implementation of the present invention, the subcarrier and time slot allocation module 505 includes: a first subcarrier and time slot allocation submodule, a second subcarrier and time slot allocation submodule, a third subcarrier and time slot allocation submodule, and a third subcarrier and time slot allocation submodule. A slot allocation submodule and a fourth subcarrier and time slot allocation module (not shown in the figure).

Wherein, the subcarrier and time slot allocation module 505 is specifically configured to allocate subcarriers and time slots for services of different service levels of each ONU through the following submodules according to the above-mentioned bandwidth allocated for each ONU in the target community time slot;

The first subcarrier and time slot allocation submodule are used to allocate subcarriers and time slots for the CoS ₀ service of the target ONU according to the traffic volume of CoS ₀ in the next cycle in the bandwidth requirement information;

The second sub-carrier and time slot allocation sub-module is used to allocate sub-carriers for the CoS ₁ business transmitted by the target ONU in the idle time of the next cycle according to the estimated CoS ₁ business traffic volume recorded in the report packet of the current cycle and time slots, wherein the estimated CoS ₁ business traffic is: according to the traffic volume of the CoS ₁ business generated in every two adjacent report packet intervals in the previous second preset number of cycles, the calculated traffic volume ;

The third subcarrier and time slot allocation submodule are used to allocate subcarriers and time slots for the CoS ₁ business transmitted by the target ONU in the current cycle according to the traffic volume of the remaining CoS ₁ business recorded in the report packet of the current cycle, wherein , the traffic volume of the remaining CoS ₁ business=the total traffic volume of the CoS ₁ business cached by the target ONU in the current cycle _- the business to be sent in the pre-allocated CoS ₁ sub-cycle recorded in the gate packet of the previous cycle A period includes: CoS ₁ /CoS ₂ sub-cycle, CoS ₀ sub-cycle and pre-allocated CoS ₁ sub-cycle;

The fourth sub-carrier and time slot allocation submodule is used to allocate sub-carriers and time slots for the CoS ₂ service of the target ONU according to the traffic volume of the third type of service class CoS ₂ in the current cycle.

Specifically, the second subcarrier and time slot allocation sub-module is used to provide the CoS ₁ service transmitted by the target ONU in the idle time of the next cycle according to the estimated CoS ₁ service traffic volume recorded in the report packet of the current cycle Allocating subcarriers and time slots, wherein the estimated traffic volume of CoS ₁ business is: according to the traffic volume of CoS ₁ business generated in every two adjacent report packet intervals in the first second preset number of cycles, calculate the above The service volume obtained by the average value of the service volume of each CoS ₁ service.

Preferably, after the modulation format is selected for the ONUs included in the target community through the modulation format selection module 502, the above-mentioned bandwidth allocation device may further include: a modulation format identification module (not shown in the figure).

Wherein, the modulation format identification module is used to represent the modulation format of the ONU contained in the target community with a third preset number of bytes in the gate packet of the current cycle, so that the ONU contained in the target community can pass Parse the received gate packet of the current period to obtain the modulation format.

As can be seen from the above, in the solution provided by this embodiment, the OLT selects a modulation format for the ONUs contained in the target community according to the received bandwidth demand information of the target community in the current cycle, and then determines the available bandwidth, and according to the determined available bandwidth is Each ONU in the target community allocates bandwidth. Compared with the prior art, in the solution provided by this embodiment, when allocating bandwidth for each ONU in the target community, the bandwidth demand information of the target community is considered, and according to the different bandwidth requirements of the target community, each ONU in the community The same better modulation format is selected to obtain different available bandwidths, which satisfies the bandwidth requirements of the ONUs of each community in different situations and improves user experience.

As for the device and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and for relevant parts, please refer to part of the description of the method embodiments.

It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is a relationship between these entities or operations. There is no such actual relationship or order between them. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

Those of ordinary skill in the art can understand that all or part of the steps in the implementation of the above method can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, referred to herein as Storage media, such as: ROM/RAM, disk, CD, etc.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims (8)

1. A bandwidth allocation method is applied to an optical network terminal (OLT) in an optical network system, wherein the optical network system comprises: the OLT and a first preset number of communities, each community comprising at least one optical network unit ONU, the method comprises the following steps:

receiving bandwidth demand information of a target community in a current period;

selecting a modulation format of the ONU contained in the target community from multiple preset modulation formats according to the bandwidth demand information and a preset algorithm;

determining an available bandwidth according to the selected modulation format and the physical bandwidth;

according to the bandwidth requirement of the target community and the determined available bandwidth, allocating bandwidth to each ONU in the target community;

according to the bandwidth allocated to each ONU in the target community, allocating subcarriers and timeslots to the services of different service levels of each ONU, including:

according to the CoS in the next period in the bandwidth demand information₀Traffic of (1), CoS of target ONU₀The service allocates subcarriers and time slots;

according to the estimated CoS recorded in the report packet of the current period₁The traffic volume of the service is CoS transmitted by the target ONU in the idle time of the next period₁Traffic allocation subcarriers and timeslots, where estimated CoS₁The traffic volume of the service is: according to CoS generated in the interval of every two adjacent report packets in the period of the first preset number of periods₁The service volume of the service is calculated;

according to the residual CoS recorded in the report packet of the current period₁Traffic volume of service, CoS transmitted in current period for target ONU₁Traffic allocation subcarriers and time slots, wherein the remaining CoS₁The service volume of the service is the CoS cached by the target ONU in the current period₁Total traffic of traffic — Pre-allocated CoS recorded in last cycle's gate packet₁CoS to be sent in a sub-period₁Traffic of a service, one cycle includes: CoS₁/CoS₂Sub-period, CoS₀Subcycle and Pre-allocated CoS₁A sub-period;

according to class three class of service class CoS in current period₂Traffic of (1), CoS of target ONU₂Traffic allocates subcarriers and time slots.

2. The method according to claim 1, wherein selecting a modulation format of the ONUs included in the target population from a plurality of preset modulation formats according to a preset algorithm according to the bandwidth requirement information includes:

respectively calculating cost factors corresponding to the ONUs contained in the target community under each preset modulation format according to the bandwidth demand information, wherein the cost factors are used for representing estimated cost values of the ONUs contained in the target community when the ONUs are modulated by the current modulation format;

and selecting the preset modulation format corresponding to the minimum cost factor as the modulation format of the ONU contained in the target community.

3. The method according to claim 2, wherein the calculating, according to the bandwidth requirement information and according to a preset algorithm, cost factors corresponding to ONUs included in the target community under each preset modulation format respectively includes:

respectively calculating cost factors corresponding to the ONUs contained in the target community under each preset modulation format according to the bandwidth demand information and the following expressions,

cost factor

Wherein i represents a cycle number of a current cycle, j represents an identifier of a preset modulation format, and l represents a distance between the OLT and the target community,a delay weight coefficient representing the ith period,represents the power weight coefficient of the ith period,

rtv_τ_i,lfor a first class of service CoS in the i-1 th cycle₀Time delay of (1) and CoS in the first i-1 cycles₀Rtv _ b, the ratio between the average time delays of_i,lCoS of all ONU in bandwidth requirement of ith period of the target community₀Sum of bandwidth requirements and CoS in the first i cycles₀Rtv _ p, the ratio between the average bandwidth requirements_i,lThe ratio of the required received power of the i-1 th period to the average received power of the first i-1 periods at the preset error rate,

τ_j,lrepresents the CoS for the modulation format denoted j at the distance l between the OLT and the target community₀Time delay of p_j,lIndicating the required received power at a preset bit error rate for the modulation format identified as j at a distance l between the OLT and the target community,

f () is about τ_j,lG () as to p_j,lThe mapping function of (2).

4. The method of claim 3,

wherein n represents the number of available modulation formats of the target population at a distance l between the OLT and the target population.

5. The method of claim 1, wherein the CoS generated in every two adjacent report packet intervals in the first second preset number of cycles₁The service traffic, the calculated traffic, includes:

according to CoS generated in the interval of every two adjacent report packets in the period of the first preset number of periods₁The service volume of the service, calculating the above-mentioned each CoS₁Traffic volume obtained from an average of traffic volumes of the services.

6. A bandwidth allocation device is applied to an optical network terminal (OLT) in an optical network system, wherein the optical network system comprises: OLT and a first predetermined number of communities, each community including at least one optical network unit ONU, the apparatus comprising:

the bandwidth demand information receiving module is used for receiving bandwidth demand information of the target community in the current period;

the modulation format selection module is used for selecting the modulation format of the ONU contained in the target community from multiple preset modulation formats according to the bandwidth demand information and a preset algorithm;

an available bandwidth determining module, configured to determine an available bandwidth according to the selected modulation format and the physical bandwidth;

the bandwidth allocation module is used for allocating bandwidth to each ONU in the target community according to the bandwidth requirement of the target community and the determined available bandwidth;

a subcarrier and time slot allocation module, configured to allocate subcarriers and time slots to services of different service levels of each ONU according to the bandwidth allocated to each ONU in the target community;

the subcarrier and timeslot allocation module comprises: a first sub-carrier and time slot distribution submodule, a second sub-carrier and time slot distribution submodule, a third sub-carrier and time slot distribution submodule and a fourth sub-carrier and time slot distribution module;

wherein, the first subcarrier and time slot allocation submodule is used for allocating CoS in the next period according to the bandwidth requirement information₀Traffic of (1), CoS of target ONU₀The service allocates subcarriers and time slots;

the second sub-carrier and time slot allocation sub-module is used for allocating the estimated CoS recorded in the report packet according to the current period₁The traffic volume of the service is CoS transmitted by the target ONU in the idle time of the next period₁Traffic allocation subcarriers and timeslots, where estimated CoS₁The traffic volume of the service is: every two adjacent repors in the period according to the first preset numberCoS generated in t-pack interval₁The service volume of the service is calculated;

the third sub-carrier and time slot allocation sub-module is used for allocating the remaining CoS according to the remaining CoS recorded in the report packet of the current period₁Traffic volume of service, CoS transmitted in current period for target ONU₁Traffic allocation subcarriers and time slots, wherein the remaining CoS₁The service volume of the service is the CoS cached by the target ONU in the current period₁Total traffic of traffic — Pre-allocated CoS recorded in last cycle's gate packet₁CoS to be sent in a sub-period₁Traffic of a service, one cycle includes: CoS₁/CoS₂Sub-period, CoS₀Subcycle and Pre-allocated CoS₁A sub-period;

the fourth sub-carrier and time slot allocation sub-module is used for allocating the sub-module according to the third class of service class CoS in the current period₂Traffic of (1), CoS of target ONU₂Traffic allocates subcarriers and time slots.

7. An optical network system, comprising:

the OLT, the optical cable equipment ODN and a fourth preset number of communities;

the ODN comprises a plurality of optical splitters, wherein the number of the optical splitters is equal to the number of the communities;

the OLT is in communication connection with each community through each optical splitter in the ODN;

each community comprises at least one sub-community;

each subgroup comprises an active remote node ARN and at least one ONU which is respectively connected with the active remote node ARN in a communication way;

ARNs contained in each subgroup in the same community are in communication connection with the OLT through the same optical splitter; each subgroup in the same community communicates with the OLT through subcarriers with the same wavelength;

the OLT receives bandwidth demand information of a target community in a current period, selects a modulation format of an ONU (optical network unit) contained in the target community from multiple preset modulation formats according to the bandwidth demand information and a preset algorithm, determines an available bandwidth according to the selected modulation format and a physical bandwidth, allocates bandwidth to each ONU in the target community according to the bandwidth demand of the target community and the determined available bandwidth, and allocates subcarrier and time slot to services of different service levels of each ONU according to the bandwidth allocated to each ONU in the target community;

each ONU sends services with different service levels to the OLT according to the bandwidth allocated to the OLT by the OLT;

wherein one cycle includes: CoS₁/CoS₂Sub-period, CoS₀Subcycle and Pre-allocated CoS₁A sub-period;

each ONU is specifically used for CoS₁/CoS₂In a sub-period, sending its corresponding CoS to the OLT₁/CoS₂A service;

individual ONU in CoS₀In a sub-period, sending its corresponding CoS to the OLT₀Service, wherein each ONU transmits a CoS₀The service is as follows: CoS in the next cycle₀The service of (2);

pre-allocating CoS for each ONU₁And in the sub-period, sending corresponding services to the OLT, wherein the services sent by each ONU are as follows: estimated CoS₁The estimated CoS is the minimum value between the service volume of the service and the service volume of the service which can be sent by the fifth preset number of subcarriers₁The traffic volume of the service is: according to CoS generated in the interval of adjacent report packets in the first sixth preset number of periods₁And the service volume of the service is calculated.

8. The optical network system of claim 7,

each ONU is further used for detecting the CoS for caching₀If the space of the service is full, if the space is used for caching the CoS₀Detecting for caching CoS if the space of the service is full₂If the space of the service is full, if the space is used for caching the CoS₂If the space of the service is not full, the CoS is used₀Service store to useIn cache CoS₂The space of the service.