Bandwidth allocation method and optical line terminal

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to communication engineering and can be used in optical links. This method is used for an OLT to allocate bandwidth to an optical network unit (ONU), wherein the method includes: estimating input traffic of the ONU according to information from the ONU (S302); setting an input traffic transition signal (S304), which is used to indicate a change in the input traffic of two adjacent dynamic bandwidth allocation DBA cycles of the ONU; and allocating the bandwidth to the ONU according to the input traffic of the ONU and the input traffic transition signal (S306).

EFFECT: providing reliable bandwidth allocation, acceptable transmission delay and reliable use of uplink bandwidth.

14 cl, 11 dwg

 

The technical field to which the invention relates

The present invention relates to the field of communications and particularly to a method of allocating bandwidth to the optical line terminal.

The level of technology

Gigabit passive optical network (briefly GPON) is a communication Protocol for passive optical network, managed by the standardization Sector of telecommunications in the composition of the International Council for telecommunications (briefly ITU-T) G. 984, GPON uses multipoint topology. Fig.1 illustrates a schematic topology diagram of the GPON network in the art. As shown in Fig.1, the terminal 101 of the optical line (briefly OLT) is the main node is connected to many optical network (briefly ONU), such as ONU 103, ONU ONU 104 and 105, which are secondary nodes, each of which contains one or more shipping containers (briefly TCONT), such as TCONT1-TCONT4. Using the report message to the dynamics of bandwidth in an upward flow (briefly DBRU), TCONT inform the OLT about the amount of data that is buffered by TCONT and must be submitted to OLT, and then the data uplink is transmitted in accordance with the bandwidth allocated by the OLT.

Fig.2 illustrates a schematic diagram showing the structure of �Adra uplink in the art. As shown in Fig.2, the frame structure for uplink contains the service from the physical layer (PLOU), physical layer OAM (PLOAM), DBRU, title GPON encapsulation (header GEM), useful information, blank frame, etc. it Should be particularly emphasized that the PLOU field can be shared by all TCONT in the same ONU. In other words, when different TCONT in the same ONU is allocated with bandwidth, they can be used continuously or intermittently.

In optical networks there are two types of technologies for bandwidth allocation, namely: static allocation of bandwidth (briefly SBA) and dynamic bandwidth (briefly DBA). As for SBA, TCONT allocated fixed time slots to update the data, this mechanism undoubtedly leads to inappropriate use of certain time slots. As for DBA, the OLT dynamically allocates bandwidth according to reports from DBRU TCONT and the statistical value of traffic upstream together with the agreement on the level of service (briefly SLA), and the DBA algorithm can dynamically adjust the allocation of bandwidth in accordance with the change of the traffic.

Currently in the art already know many of the DBA algorithms, such as traditional al�oricom is the so-called alternating algorithm orderly polling with adaptive cycle time (briefly IPACT), which polls all the TCONT and receives reports from DBRU each TCONT to obtain information about the status of TCONT, buffering the data, and then determine the amount of bandwidth that must be allocated.

However, the IPACT algorithm still has its own drawbacks. The first drawback is that OLT is not able to determine accurately the traffic data transmitted TCONT from the subscriber terminal equipment (briefly CPE) in a single DBA cycle. The second drawback is that the IPACT algorithm is unable to accurately estimate the service traffic signals uplink, in which identification signals contain DBRU, PLOAM, the GEM header and an empty frame, etc.

Disclosure of the invention

The present invention is proposed in connection with the above-mentioned problems in the art related to the fact that the IPACT algorithm is not able to give traffic information passed TCONT from subscriber terminal equipment, or to accurately assess the service traffic signals uplink. Therefore, one aspect of the present invention is to provide a decision on the allocation of bandwidth to overcome at least one of the above problems.

To achieve the above goal, a method of allocating bandwidth in accordance with one aspect nastojasih� invention.

The method for allocating bandwidth according to the present invention is used for optical line terminal (OLT) allocates bandwidth to the optical network device (ONU). Mentioned method contains the stages at which: appreciate the input traffic of the ONU in accordance with the information from the ONU; set the signal changes of the input traffic, which is used to specify the input traffic of two adjacent cycles of dynamic bandwidth allocation (DBA) ONU; and allocate bandwidth to the ONU in accordance with the input traffic of the ONU and the signal changes of the input traffic.

The input stage of assessment of traffic ONU preferably consists that appreciate the input traffic of the ONU in accordance with the report on the dynamics of bandwidth in an upward flow (DBRU) and traffic data uplink from the ONU, and DBRU contains the amount of data buffered by ONU.

Preferably, the input ONU traffic was estimated using the following formula: Est(n)=DBRU(n-1)-DBRU(n-2)+pm(n-2), where Est(n) is the estimated value of the input traffic ONU, pm(n-2) represents the traffic data ascending line of communication, passed on from OLT ONU (n-2) th cycle, DBA, and DBRU(n-1) and DBRU(n-2) represent the amount of data buffered by ONU (n-1) th cycle, DBA and (n-2) th cycle, DBA, respectively.

Stage allocat�the access bandwidth ONU in accordance with the input traffic of the ONU and the signal changes of the input traffic preferably is that is, when the signal changes of the input traffic indicates that there is a sharp change of the input traffic of two adjacent cycles DBA ONU, allocate ONU by OLT bandwidth greater than the bandwidth allocated to the ONU by the OLT, when there is an abrupt change of the input traffic of two adjacent cycles DBA ONU.

Preferably, in the case of a sharp change in the input traffic of two adjacent cycles DBA ONU bandwidth allocated to the ONU, was calculated using the following formula: Grant(n)=DBRU(n-1)+coef1*Est(n), where Est(n) is the estimated value of the input traffic ONU, DBRU(n-1) represents the amount of data buffered ONU (n-1) th cycle, DBA, Grant(n) is a bandwidth allocated to the ONU in the n th cycle, DBA, and coef1 is a pre-defined value.

Preferably, in the absence of abrupt changes in the input traffic of two adjacent cycles DBA ONU bandwidth allocated ONU by the OLT in accordance with the evaluation value of the input traffic ONU and signals service.

The input stage of assessment of traffic ONU preferably consists that appreciate the input traffic of the ONU in accordance with the traffic data uplink from the ONU.

Preferably, the abrupt change of the signal changes of the input traffic could occur when the data traffic ascending�line ONU connection is changed from a value below the threshold to above the threshold value and when OLT ONU allocates the maximum bandwidth uplink; and to the abrupt change of the signal changes of the input traffic could occur when the data traffic uplink ONU is changed from a value above the threshold to a value below a threshold value and when the OLT does not emit ONU bandwidth uplink.

Preferably, in the absence of abrupt changes in the input traffic of two adjacent cycles DBA ONU bandwidth allocated to the ONU, was calculated using the following formula: Grant(n)=alpha*Grant(n-1)+(1-alpha)*(Est(n)+overhead(n)), where Est(n) is the estimated value of the input traffic ONU, Grant(n) is a bandwidth allocated to the ONU in the n th cycle, DBA, Grant(n-1) represents the bandwidth allocated ONU (n-1) th cycle, DBA, and an alpha value greater than or equal to 0 and less than or equal to 1, with overhead(n) represents the number of service signals in the n-cycle DBA.

The step of calculating the amount of service signals preferably is that: if the loop response DBA consists of two cycles, calculate the identification signals using the following formula: overhead(n+1)=Grant(n-1)-(pm(n+1)+idle(n+1)), where overhead(n+1) represents the number of service signals in the (n+1) th cycle, DBA, Grant(n-1) is the bandwidth, dedicated ONU (n-1) th cycle, DBA, pm(n+1) represents the data traffic uplink transmitted to ONU OLT from the (n+1) th cycle, DBA, and idl(n+1) is the statistical value of free data transmitted from ONU in (n+1) th cycle, DBA; if the loop response DBA consists of a single cycle, calculate the identification signals using the following formula: overhead(n+1)=Grant(n)-(pm(n+1)+idle(n+1)); and if the loop response DBA consists of three cycles, calculate the identification signals using the following formula: overhead(n+1)=Grant(n-3)-(pm(n+1)+idle(n+1)).

Preferably, the aforementioned method additionally containing a stage at which adds an identifier to information about the Protocol of the agreement on service levels (SLA), and the identifier is used to determine whether to allocate bandwidth to the current TCONT according to the location of the current TCONT ONU in the linked list TCONT.

To achieve the above-mentioned purposes are also proposed to the optical line terminal in accordance with another aspect of the present invention.

The optical line terminal of the present invention comprises: a calculation module, configured to evaluate the input traffic of the optical network device (ONU) in accordance with the information from the ONU; setup module, configured to set the signal changes of the input traffic, and incoming traffic is used to specify the input traffic of two adjacent cycles of dynamic bandwidth allocation (DBA) ONU; and an allocation module, configured to allocate bandwidth to the ONU in accordance with the input t�Afik ONU and the signal changes of the input traffic.

Preferably, the computing module is further configured to evaluate the input traffic of the ONU in accordance with the report on the dynamics of bandwidth in an upward flow (DBRU) and traffic data uplink from the ONU, and DBRU contains the amount of data buffered by ONU.

Preferably, the computing module is further configured to evaluate the input traffic of the ONU in accordance with the traffic data uplink from the ONU.

Thanks to the present invention the aforementioned problems in the art related to the fact that the IPACT algorithm is not able to give traffic information passed TCONT from subscriber terminal equipment, or to accurately assess the service traffic signals uplink resolved through the allocation of ONU bandwidth in accordance with the input traffic of the ONU and the signal changes of the input traffic; it also provides the reliable allocation of bandwidth, acceptable latency and adequate bandwidth uplink.

Brief description of the drawings

The drawings provide a further understanding of the present invention and form a part of this application. An exemplary implementation options and their descriptions are used to explain the present�status (active or inactive of the invention, without going beyond the scope of the present invention; the drawings include:

Fig.1 illustrating a schematic topology diagram of the GPON network in the art;

Fig.2 illustrating a schematic structure diagram of a frame of the uplink in the art;

Fig.3 illustrating a block diagram of the sequence of steps of a method for allocating bandwidth in accordance with a variant implementation of the present invention;

Fig.4, illustrating a detailed block diagram of the solution on dynamic allocation of bandwidth GPON in accordance with a variant implementation of the present invention;

Fig.5, illustrating a schematic structure diagram of the connection between OLT and ONU in accordance with a variant implementation of the present invention;

Fig.6, illustrating a schematic diagram of a time sequence of communication between OLT and ONU in accordance with a variant implementation of the present invention;

Fig.7, illustrating a block diagram of the sequence of steps of the algorithm SR-DBA in accordance with a variant implementation of the present invention;

Fig.8, illustrating a block diagram of the sequence of steps of the algorithm NSR-DBA, in accordance with a variant implementation of the present invention;

Fig.9(a) illustrating a schematic diagram showing that different TCONT in about�nom and the same ONU share a service from PLOU, in accordance with a variant implementation of the present invention;

Fig.9(b) illustrating a schematic diagram showing that different TCONT in the same ONU does not share the official signals PLOU, in accordance with a variant implementation of the present invention; and

Fig.10, illustrating a structural block diagram of the OLT in accordance with a variant implementation of the present invention.

The implementation of the invention

It should be clear that embodiments of the present invention and its features may be combined with each other, if it does not cause any contradictions. The present invention will be further described in detail in combination with drawings and embodiments of the implementation.

In subsequent embodiments, the steps shown in the flowcharts, can be implemented in a computer system using a set of machine-readable commands. In addition, although the block diagrams show the logical sequence of stages, in some cases, the illustrated or described steps can be executed in the order specified.

The first variant of implementation

In connection with the above-mentioned problems in the art related to the fact that the IPACT algorithm is not able to give traffic information passed TCONT from subscriber terminal equipment, or just about�animati official traffic signals in an upward flow, this version of the implementation provides the allocation of bandwidth. The principle of this decision is that: assess incoming traffic ONU in accordance with the information from the ONU; set the signal changes of the input traffic, which is used to specify the input traffic of two adjacent cycles of dynamic bandwidth allocation (DBA) ONU; and allocate bandwidth to the ONU in accordance with the input traffic of the ONU and the signal changes of the input traffic. This solution provides a single schema DBA, containing algorithms for dynamic allocation of bandwidth based on the reports DBRU (DBA with information about the status - brief in SR-DBA) and dynamic bandwidth allocation is not based on the reports DBRU (DBA with no information about the status - briefly NSR-DBA).

For a better understanding of the present embodiment will first be described by its schema. This scheme contains: module of evaluation of bandwidth, which is made with the ability to assess incoming traffic at the terminal ONU and to which are applied the algorithms SR-DBA and NSR-DBA provided in embodiments of the present invention; a module for computing the bandwidth, which is arranged to calculate the bandwidth to be obtained specific TCONT, in accordance with the SLA, konfigurera�data configuration software and input traffic at the terminal ONU, estimated by the estimation module bandwidth; the module of formation of records in the table BWMAP, which is made with possibility to form the entry in the table BWMAP specific TCONT in accordance with the bandwidth calculated by the calculation module bandwidth, and content record includes the start time and end time, etc., in which specific TCONT allowed to send traffic uplink; and module drafting table BWMAP, which is arranged to store information about the records in the table BWMAP from all TCONT. This version of the implementation will be further explained on the basis of this scheme.

The method for allocating bandwidth provided in accordance with a variant implementation of the present invention is applied to OLT to allocate bandwidth ONU. Fig.3 illustrates a block diagram of the sequence of steps of a method for allocating bandwidth in accordance with a variant implementation of the present invention. As shown in Fig.3, the method includes the steps S302-S306, which are as follows.

Step S302: assess incoming traffic ONU in accordance with the information from the ONU.

Step S304: sets the signal abrupt changes in the input traffic, which is used to specify the input traffic of the two adjacent slightly�'s cycles of dynamic bandwidth allocation (DBA) ONU. For example, the signal changes of the input traffic is set on the basis of the evaluation values of the input traffic of the ONU and the changes of two adjacent cycles DBA, the signal may persist for several cycles DBA until then, until the change of the statistical significance of the appearance of an empty frame starts to reach a certain value.

Step S306: allocate bandwidth to the ONU in accordance with the input traffic of the ONU and the signal changes of the input traffic.

Thanks to the options of implementing the present invention, the disadvantages of the IPACT algorithm are eliminated by allocating bandwidth ONU based on the input of the ONU traffic and signal changes of the input traffic, while achieving reliable allocation of bandwidth, acceptable latency and adequate bandwidth uplink.

After step S306 can be saved to different values of the signal used for the specified algorithm, including the appraised value of the input traffic, the value DBRU and the value of the allocated bandwidth.

The above-mentioned step S302 can be performed in two ways: the first method is the SR-DBA, and the second way - NSR-DBA. These two methods will be described below as appropriate.

The first method

Incoming traffic ONU evaluated in accordance with the DBRU report and traffic ascending whether�AI communications from the ONU, the DBRU report contains the amount of data buffered by ONU (it should be noted that this amount of data buffered in the DBRU report, is used in this variant of implementation, and other content of this report that includes, for example, an identification bit, will not be described in detail in this document because it is not relevant to the evaluation of the input traffic), i.e., the input traffic ONU evaluated in accordance with the DBRU report and traffic uplink transmitted from the ONU, and the input of the ONU traffic could be estimated using the following formula:

Est(n)=DBRU(n-1)-DBRU(n-2)+pm(n-2), where Est(n) is the estimated value of the input traffic, pm(n-2) represents the traffic data ascending line of communication, passed on from OLT ONU (n-2) th cycle, and DBRU(n-1) and DBRU(n-2) represent the amount of data buffered ONU (n-1)-m DBA cycle and (n-2) th cycle, DBA, respectively; and if the DBRU report does not contain data that should be transferred immediately from TCONT, pm(n-2) in the above formula is replaced by pm(n-1).

Thus, in the case of bandwidth allocation, the bandwidth allocated to the ONU by the OLT, when the signal changes of the input traffic is indicated by the appearance of abrupt changes in the input traffic of two adjacent cycles DBA ONU, more bandwidth allocated to the ONU through OT, when there is no abrupt change of the input traffic of two adjacent cycles DBA ONU, i.e. in case of change of the input traffic OLT requires the ONU to allocate more bandwidth, because the OLT answer to a request bandwidth from the ONU needs to be delayed by several cycles DBA, and in the absence of changes in the input traffic is allocated the estimated value of the input traffic and service signals, wherein, when there is a sharp change of the input traffic of two adjacent cycles DBA ONU, the bandwidth allocated ONU can be calculated based on the following formula:

Grant(n)=DBRU(n-1)+coef1*Est(n), where Est(n) is the estimated value of the input traffic, DBRU(n-1) represents the amount of data buffered ONU (n-1) th cycle, DBA, Grant(n) is a bandwidth allocated to the ONU in the n th cycle, DBA, coef1 and may be determined during debugging in accordance with practical situations.

When there is no abrupt change of the input traffic of two adjacent cycles DBA ONU, the OLT allocates the bandwidth ONU in accordance with the evaluation value of the input traffic and service signals.

The second way

Input the ONU traffic is evaluated according to the traffic data uplink from the ONU.

The abrupt change of the signal changes of the input traffic occurs when data traffic uplink ONU is changed about� values below the threshold to above the threshold value, and then OLT allocates the maximum bandwidth ONU. The abrupt change of the signal changes of the input traffic occurs when data traffic uplink ONU is changed from a value above the threshold to a value below a threshold, and then OLT allocates bandwidth uplink ONU.

In the above two methods, when there is an abrupt change of the input traffic of two adjacent cycles DBA ONU, the bandwidth allocated ONU can be calculated based on the following formula:

Grant(n)=alpha*Grant(n-1)+(1-alpha)*(Est(n)+overhead(n)), where Est(n) is the estimated value of the input traffic, Grant(n) is a bandwidth allocated to the ONU in the n th cycle, DBA, Grant(n-1) represents the bandwidth allocated ONU (n-1) th cycle, DBA, and an alpha value greater than or equal to 0 and less than or equal to 1.

In the further implementation process of embodiments of the present invention will be described in detail in combination with examples.

Fig.4 illustrates a detailed block diagram of the solution on dynamic allocation of bandwidth GPON in accordance with a variant implementation of the present invention. As shown in Fig.4, the module dynamically allocating bandwidth in the present version of the implementation contains five modules.

The module 301 of the estimation bandwidth (forecast�ing bandwidth) receives from other modules of the chip, the number of buffered data reported by ONU (i.e., the DBRU report), and statistical significance of the data traffic uplink and then evaluates the input traffic of the ONU, wherein the evaluation value is transmitted to the module 302 calculate the bandwidth calculation (lines); configuration software (software) 306 it also configures the SLA information module 302 calculate the bandwidth via module 304 main control (primary control), wherein the SLA information includes information such as the maximum bandwidth that can be allocated to the current ONU, and the ONU priority level; the module 302 calculate the bandwidth implements the algorithm for computing the bandwidth specified in G. 984 Protocol.3, in accordance with information from the module 301 of estimating bandwidth and configuration software 306 to obtain the bandwidth allocated to each TCONT; dedicated bandwidth are transmitted to the module 303 of the formation of records in the table BWMAP (access), and the module of formation records sequentially allocates bandwidth for each TCONT bandwidth frame uplink, including information such as the start time and end time for each TCONT can transmit danielashtiani communication line; records generated by module 303 of the formation of records in the table BWMAP, transferred to and saved in the table 305 BWMAP and subsequently become one part of the frame of the downlink, which should be transmitted to each ONU to inform each ONU on the transfer of traffic uplink in the time period regulated OLT. The module 304 of the primary control is responsible for coordinating and managing the order of operations of other modules.

The aforementioned algorithms in the present version of the implementation will be described in detail in conjunction with Fig.5 and 6. Fig.5 illustrates a schematic diagram of the structure of communication between OLT and ONU in accordance with a variant implementation of the present invention, and Fig.6 illustrates a schematic diagram of a time sequence of communication between OLT and ONU in accordance with a variant implementation of the present invention.

As shown in Fig.5, the generator 403 rectangular signals (signal generator) is a source of input signals ONU 402, and the source signal includes a stream of continuous data (constant bit rate data stream - briefly CBR) and data flow about a sharp change (variable bit rate data stream - briefly VBR). Algorithm SR-DBA applies, but is not limited to this, CBR/VBR and can be configured for any form of input�Alov. After receiving input from the generator 403 rectangular signals ONU 402 will be to buffer the data in the BUFFER 404 and to report the amount of data in the BUFFER 404 at the OLT 401, using the DBRU report. After OLT 401 receives the DBRU report and traffic data uplink ONU, DBA 405 receives through the DBA algorithm bandwidth uplink allocated to each ONU. ONU 402 will transmit a certain amount of data uplink in accordance with the allocated bandwidth uplink and the amount of data stored in the BUFFER 404, the amount of data uplink includes the amount of data that has small size in the bandwidth of the uplink allocated to the OLT, and all current data in the BUFFER 404.

Fig.6 illustrates the relation of the temporal sequence of communication between OLT and ONU. As shown in Fig.6, (n-1) th cycle, DBA ONU will send DBRU report and transmit traffic uplink; in n-cycle DBA DBA algorithm will perform the operation DBA in accordance with the DBRU report and the statistical value of traffic uplink to get bandwidth uplink allocated to each ONU so that the ONU transmits data uplink in the (n+1) th cycle, DBA. Obviously, the answer to the query DBRU sent by the ONU, �Udet obtained after two cycles DBA.

In the process of communication between OLT and ONU formula (a) is applied to the ONU.

DBRU(n-1)=DBRU(n-2)+IN(n-1)-pm(n-2)fopmIla(a)

In the above formula IN(n-1) represents the amount of data taken by the ONU from the generator 403 rectangular signals in the (n-1) th cycle, DBA, pm(n-2) represents the data traffic uplink transmitted from OLT ONU (n-2) th cycle, DBA, and DBRU(n-1) and DBRU(n-2) represent the amount of data buffered in the (n-1) th cycle, DBA and (n-2)th cycle, DBA, respectively. Terminal OLT can be obtained each of pm(n-2), DBRU(n-1) and DBRU(n-2) so that the estimated value Est(n) is the input value of the data flow IN(n-1) at the terminal for terminal OLT ONU is obtained from the formula (b):

Est(n)=DBRU(n-1)-DBRU(n-2)+pm(n-2) formula (b)

In the process of communication between OLT and ONU, we use formula (C) according to Fig.6.

Grant(n-1)=pm(n+1)+idle(n+1)+overhead(n+1) formula(C)

In the formula (C) Grant(n-l) represents the bandwidth actually allocated TCONT module 302 calculate the bandwidth (n-1) th cycle, DBA, pm(n+l) is the statistical value of traffic data uplink transmitted from OLT ONU in the (n+1) th cycle, DBA, and idle(n+1) and overhead(n+1) represent the statistical value of free data transferred from the ONU, and the amount of service signals in the (n+1) th cycle, DBA, respectively. Terminal OLT can be obtained from each Grant(n-1), pm(n+1) and idle(n+1), so the computed value signals service overhead(n+1) to the terminal ONU terminal OLT can be obtained from the formula (d):

overhead(n+1)=Grant(n-1)-(pm(n)+1)+idle(n+1)) formula (d)

It should be emphasized that when the loop response consists of one or three cycles DBA, Grant(n-1) in visepresident�the formula may change to Grant(n) or Grant(n-2).

Next will be described the operation of the algorithms SR-DBA and NSR-DBA in the present version of the implementation.

Fig.7 illustrates a block diagram of the sequence of steps of the algorithm SR-DBA in accordance with a variant implementation of the present invention. As shown in Fig.7, formula (b) is the first stage in the block diagram of the algorithm shown in Fig.7. At this stage the input data stream ONU can be estimated using the following procedures in which Est_avg is an average of the Est and can be obtained under the following codes:

In the second stage, shown in Fig.7, sets the signal Trans, which is characterized by an abrupt change in estimated value Est. The signal Trans will be maintained until the appearance of blank frames is insignificant in relation to the emergence of traffic. This step can be implemented using the following code:

In the third stage, shown in Fig.7, the OLT performs the estimation of the bandwidth requested by the current ONU. If there is a sharp change Trans, OLT will allocate more bandwidth because, as can be seen from Fig.6, the answer to the query DBRU sent to ONU, will be obtained after two cycles DBA, while this delay will result in the accumulation of data in the BUFFER 404 of the ONU; if there is no abrupt change in Trans, ONU stand out traffic in the quantity equal to the data traffic, received from the ONU generator 403, plus signals service. When there is an abrupt change Est to a dedicated traffic Grant applies a low pass filter of the first order infinite impulse response (IIR), mainly for use smoothing to Grant. The range of values of the smoothing coefficient alpha of the specified filter lies in the following ranges: 0<=alpha<=1. The more alpha the better the effect of the smoothing low-pass filter. This step can be implemented using the following codes:

The fourth stage shown in Fig.7, is that retain the various signals to be used in these algorithms. This step can be implemented using the following codes:

After these four stages will be completed, they can again be performed cyclically to calculate the next TCONT.

Fig.8 illustrates a block diagram of the sequence of steps of the algorithm NSR-DBA, in accordance with a variant implementation of the present invention. As shown in Fig.8, at the first stage, shown in Fig.8, an average value is calculated traffic Estavg two adjacent cycles DBA, and the traffic is used as the estimates of traffic Est algorithm NSR-DBA. This atabout to be implemented using the following codes:

In the second stage sets the signal Trans, which is characterized by an abrupt change in the value of traffic Est. This signal Trans will be at a high level, when the traffic varies from values below the threshold TN to a value above the threshold value TN or decreases from a value above the threshold to a value below the threshold. The signal Trans maintained at a high level up until the statistical value of idle data will not be available for a long time to exceed 2-SHT Est_avg and reaches time IDLECNTTH, i.e. the time at which the signal Trans will go to the lower level. This step can be implemented using the following codes:

In the third stage, the OLT performs an assessment of the bandwidth requested by the current ONU. If there is a sharp change Trans, varying from values below the threshold TN to a value above the threshold value TN, the OLT will allocate the maximum bandwidth; if there is a sharp change Trans, decreasing from values above the threshold value TN to a value below the threshold T, OLT will not allocate bandwidth TCONT; if there is no abrupt change in Trans, the value of the allocated bandwidth will tend to the total statistical Zn�increasing traffic and service signals (Est(n)+overhead(n)) and the specific method of calculation signals service can refer to the formula (d); when there is an abrupt change Est, the algorithm uses a low pass filter of the first order infinite impulse response (short - IIR) for the selected traffic Grant, mainly for the use of smoothing and forecasting of Grant. The range of values of the smoothing coefficient alpha of the specified filter lies in the following ranges: 0<=alpha<=1. The more alpha the better the effect of the smoothing low-pass filter. This step can be implemented using the following codes:

The fourth stage is that retain the various signals that should be used in these algorithms, and this step can be implemented using the following codes:

After the four stages will be completed, they again recur to calculate the next TCONT.

Next will be described the way in which different TCONT in the same ONU share a service from PLOU in the present version of the implementation.

The way in which different TCONT in the same ONU share a service from PLOU, also provided in the present variant implementation. This method includes a step, which adds the ID information to the SLA, and the identifier is used �La definitions to distinguish whether the current bandwidth TCONT ONU signals service for PLOU, in accordance with the location of the current TCONT ONU in the linked list TCONT. This method will be described next.

Fig.9(a) illustrates a schematic diagram showing that different TCONT in the same ONU share a service from PLOU in accordance with a variant implementation of the present invention; and Fig.9(b) illustrates a schematic diagram showing that different TCONT in the same ONU does not share the official signals PLOU in accordance with a variant implementation of the present invention. As shown in Fig.9(a), when the SLA information, configured software 306 is inserted into the module 302 computing bandwidth, two bits and information about the quality of service (short - QOS) can be configured together in the memory module 302 calculate the bandwidth. Two bits one represents the initial bit of data about a sudden change (the beginning of a drastic change - briefly SOB) and the other last bit of data about a sudden change (the end of the abrupt change in short - LOB). If we assume that the current TCONT is in first place in the linked list TCONT ONU, the SOB needs to be configured is 1. If we assume that the current TCONT is in last place in the linked list TCON ONU, the LOB must be configured equal to 1. Finally, if we assume that the current TCONT is in the middle of the linked list TCONT ONU, SOB and LOB needs to be configured to 0. In that and only in that case when the SOB is configured equal to 1, the module 302 of the calculation of bandwidth to allocate bandwidth to this TCONT, and other TCONT will share this byte PLOU. Of course, different TCONT in the same ONU can also do SOB and LOB is equal to 1, as if they were from different ONU, as shown in Fig.9(b), but it will lead to excessive bandwidth consumption. The second variant of implementation of the OLT provided in accordance with a variant implementation of the present invention. Fig.10 illustrates a structural block diagram of the OLT in accordance with a variant implementation of the present invention. As shown in Fig.10, the OLT includes a computing module 12, the module 14 of the installation and the selection module 16. This structure will be hereinafter described in detail.

Module 12 calculations performed with the opportunity to evaluate incoming traffic ONU in accordance with the information from the optical network device (ONU). Module 14 of the installation is connected to the computing module 12 and is arranged to set the signal changes of the input traffic, which is used to specify the input traffic of two adjacent cycles DBA ONU. Module 16 �of adelene is connected to the module 14 and module 12 calculations and is arranged to allocate bandwidth to the ONU in accordance with the input traffic of the ONU and the signal changes of the input traffic.

Module 12 calculations can estimate the input ONU traffic in two ways, corresponding to the mentioned first method and the second method mentioned in the above-described first variant implementation, respectively. Next will be described the operation of the module 12 calculations using the two methods.

More specifically, in the first method the calculation module 12 is arranged to estimate the input traffic of the ONU in accordance with the report on the dynamics of bandwidth in an upward flow (DBRU) and traffic data uplink from the ONU, and the DBRU report contains the amount of data buffered by ONU.

More specifically, in the second method, the computing module 12 is arranged to estimate the input traffic of the ONU in accordance with the input data traffic from the ONU.

It should be emphasized that the specific calculation bandwidth by using the above two methods were described in detail in the description of the first variant of implementation, and unnecessary details will not be described in this document.

Thus, thanks to the options of implementing the present invention, the problems in the art related to the fact that the IPACT algorithm is not able to give information about the traffic sent many TCONT from subscriber terminal equipment, or to accurately assess service �Ignacy traffic uplink resolved by allocating bandwidth ONU in accordance with the input traffic and the signal changes of the input traffic it also provides the reliable allocation of bandwidth, acceptable delay transmission and the appropriate use of bandwidth uplink.

Specialists in this field of technology will undoubtedly understand that individual modules and steps of the present invention can be implemented using conventional computing devices, and they can be combined into a single computing device or distributed in network formed by multiple computing devices. In addition, individual modules and steps of the present invention can be further implemented by using program codes executable by computing devices, thus they can be stored in memory devices for execution by the computing devices, or implemented by their proper implementation in a module, integrated circuits, or implementation of several modules or stages in a module from one of the integrated circuit. Thus, the present invention is not limited to any specific combination of hardware and software.

The foregoing is only preferred embodiments of the present invention and does not limit it. Various changes or modifications of the present invention should be evident� skilled in the art. Any modifications, equivalent substitutions, improvements and etc. within the spirit and principle of the present invention should be included in the scope of the claims protected by the present invention.

1. The method for allocating bandwidth used for the optical line terminal (OLT) for allocation of bandwidth to the optical network device (ONU), characterized in that it comprises the stages at which:
appreciate the input traffic of the ONU in accordance with the information from the ONU;
set the signal changes of the input traffic, which is used to specify the input traffic of two adjacent cycles of dynamic bandwidth allocation (DBA) ONU; and
allocate bandwidth to the ONU in accordance with the input traffic of the ONU and the signal changes of the input traffic.

2. A method according to claim 1, characterized in that the input stage of assessment of the ONU traffic is that:
appreciate the input traffic of the ONU in accordance with the report on the dynamics of bandwidth in an upward flow (DBRU) and traffic data uplink from the ONU, and DBRU contains the amount of data buffered by ONU.

3. A method according to claim 2, characterized in that the input of the ONU traffic estimate using the following formula:
Est(n)=DBRU(n-1)-DBRU(n-2)+pm(n-2)
where Est(n) is the estimated value of the input traffic ONU, pm(n-2) represents the traffic data� upward communication line, passed on from OLT ONU (n-2) th cycle, DBA, and DBRU(n-1) and DBRU(n-2) represent the amount of data buffered ONU (n-1) th cycle, DBA and (n-2) th cycle, DBA, respectively.

4. A method according to claim 2, characterized in that the step of allocating bandwidth ONU in accordance with the input traffic of the ONU and the signal changes of the input traffic is that:
when the signal changes of the input traffic indicates that there is a sharp change of the input traffic of two adjacent cycles DBA ONU, allocate ONU by OLT bandwidth greater than the bandwidth allocated to the ONU by the OLT, when there is an abrupt change of the input traffic of two adjacent cycles DBA ONU.

5. A method according to claim 4, characterized in that, when there is a sharp change of the input traffic of two adjacent cycles DBA ONU, calculate the bandwidth allocated to the ONU using the following formula:
Grant(n)=DBRU(n-1)+coef1*Est(n),
where Est(n) is the estimated value of the input traffic ONU, DBRU(n-1) represents the amount of data buffered ONU (n-1) th cycle, DBA, Grant(n) is a bandwidth allocated to the ONU in the n th cycle, DBA, coef1 and is a pre-defined value.

6. A method according to claim 4, characterized in that, when there is an abrupt change of the input traffic of two adjacent cycles DBA ONU, the OLT allocates the bandwidth ONU in accordance with OTS�night value of the input traffic ONU and signals service.

7. A method according to claim 1, characterized in that the input stage of assessment of the ONU traffic is that:
appreciate the input traffic of the ONU in accordance with the traffic data uplink from the ONU.

8. A method according to claim 7, characterized in that the abrupt change of the signal changes of the input traffic occurs when data traffic uplink ONU varies from values below the threshold to above the threshold value and when OLT ONU allocates the maximum bandwidth uplink; and a drastic change of the signal changes of the input traffic occurs when data traffic uplink ONU is changed from a value above the threshold to a value below a threshold value and when the OLT does not emit ONU bandwidth uplink.

9. A method according to claim 6 or 8, characterized in that, when there is an abrupt change of the input traffic of two adjacent cycles DBA ONU, calculate the bandwidth allocated to the ONU using the following formula:
Grant(n)=alpha*Grant(n-1)+(1-alpha)*(Est(n)+overhead(n))
where Est(n) is the estimated value of the input traffic ONU, Grant(n) is a bandwidth allocated to the ONU in the n th cycle, DBA, Grant(n-1) represents the bandwidth allocated ONU (n-1) th cycle, DBA, and an alpha value greater than or equal to 0 and less than or equal to 1, with overhead(n) is a fun� the amount of service signals in the n-cycle DBA.

10. A method according to claim 9, characterized in that the step of calculating the number of signals service is that:
if the loop response DBA consists of two cycles, calculate the identification signals using the following formula: overhead(n+1)=Grant(n-1)-(pm(n+1)+idle(n+1)), where overhead(n+1) represents the number of service signals in the (n+1) th cycle, DBA, Grant(n-1) represents the bandwidth allocated ONU (n-1) th cycle, DBA, pm(n+1) represents the data traffic uplink transmitted to ONU OLT from the (n+1) th cycle, DBA, and idle(n+1) is the statistical value of free data transferred from the ONU (n+1) th cycle, DBA;
if the loop response DBA consists of a single cycle, calculate the identification signals using the following formula: overhead(n+1)=Grant(n)-(pm(n+1)+idle(n+1)); and
if the loop response DBA consists of three cycles, calculate the identification signals using the following formula: overhead(n+1)=Grant(n-3)-(pm(n+1)+idle(n+1)).

11. A method according to any one of claims.1-8, characterized in that it further comprises a stage on which:
add an identifier to information about the Protocol of the agreement on service levels (SLA), and the identifier is used to determine whether to allocate bandwidth to the current TCONT according to the location of the current TCONT ONU in the linked list TCONT.

12. The optical line terminal, characterized in that it comprises:
a calculation module, configured to sions�ü incoming traffic of the optical network device (ONU) in accordance with the information from the ONU;
setup module, configured to set the signal changes of the input traffic, and incoming traffic is used to specify the input traffic of two adjacent cycles of dynamic bandwidth allocation (DBA) ONU; and
an allocation module, configured to allocate bandwidth to the ONU in accordance with the input traffic of the ONU and the signal changes of the input traffic.

13. The optical line terminal according to claim 12, characterized in that the calculation module further configured to evaluate the input traffic of the ONU in accordance with the report on the dynamics of bandwidth in an upward flow (DBRU) and traffic data uplink from the ONU, and DBRU contains the amount of data buffered by ONU.

14. The optical line terminal according to claim 12, characterized in that the calculation module further configured to evaluate the input traffic of the ONU in accordance with the traffic data uplink from the ONU.



 

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