KR20150132766A - Method and apparatus for changing transmitting bandwidth on point-to-multipoint packet transmitting system - Google Patents

Abstract

Disclosed are a method and apparatus for adjusting a transmission bandwidth in a point to multi-point (P2MP) packet transmission system. The method of the present invention comprises the following steps: determining whether adjustment of the current transmission bandwidth due to merging of a label switched path (LSP) is needed or not when a leaf node is added or reduced; determining an upward guard band of the current transmission bandwidth as a resetting upward guard band and determining a downward guard band of the current transmission bandwidth as the resetting downward guard band when the adjustment is needed; and transmitting an operation, administration & maintenance (QAM) packet merged based on the merging of the LSP through the resetting upward guard band and resetting downward guard band.

Description

TECHNICAL FIELD [0001] The present invention relates to a P2MP packet transmission system, and more particularly to a method and apparatus for adjusting a transmission bandwidth in a P2MP packet transmission system.

The present invention relates to communications, and more particularly, to a communication method and apparatus in a MPLS-TS based network.

Carrier Ethernet technology is used for Quality of Service (QoS), Operation, Administration, and Management, which were provided by line-based synchronous optical network (SONET) / synchronous digital hierachy (SDH) It is possible to provide packet-based delivery service with low maintenance cost while maintaining the efficiency of function and bandwidth.

MPLS-TP (Multi-Protocol Label Switching-Traffic Profile) technology is one of the carrier Ethernet transmission network technologies. MPLS-TP technology can be used for the transport network by using the connectionless packet switching technology used in the non-connection Multi-Protocol Label Switching (MPLS) technology as a virtual circuit-based connectivity packet switching technology. In addition, MPLS-TP technology is a backbone technology that provides higher reliability, reliability, and scalability through protection recovery in case of link failure. The MPLS-TP protocol standardizes the ITU-T and IETF (internet engineering task force) as the standard of the telecommunication standardization sector of the international telecommunications union (ITU-T) developed as MPLS-based T-MPLS (Transport MPLS) And is being standardized as MPLS-TP.

MPLS technology is an IETF standardized transport technology that uses L2 switching to add labels to packets to reduce the load on existing IP (internet protocol) packet routing and to improve the inefficiency of IP address lookup. MPLS technology can provide non-connection oriented services for high-speed IP packet switching.

MPLS-TP technology is a carrier Ethernet technology that satisfies the transport network function required in Carrier Ethernet wireless backhaul network while maintaining the MPLS architecture. MPLS-TP-based Carrier Ethernet network can accommodate various OAM needs of users and can detect and protect all errors within 50ms regardless of the distance when using service to meet service network quality and availability.

A first object of the present invention is to provide a method of adjusting a transmission bandwidth in a P2MP packet transmission system.

A second object of the present invention is to provide an apparatus for performing a method of adjusting a transmission bandwidth in a P2MP packet transmission system.

According to an aspect of the present invention, there is provided a method of adjusting a transmission bandwidth in a point-to-multipoint (P2MP) packet transmission system, determining whether an adjustment of the current transmission bandwidth due to the merging of the current transmission bandwidth is necessary or not; if the adjustment of the current transmission bandwidth is necessary, determining an upper boundary band of the current transmission bandwidth as a reset upper boundary band; Determining a band as a reset downlink band and transmitting the merged operation, administration & maintenance (OAM) packet based on the re-establishment of the LSP over the re-established uplink boundary band and the reconfigured downlink boundary band. have. Wherein the step of determining whether or not the current transmission bandwidth adjustment is required includes the step of determining whether a sum of the current transmission bandwidth and the additional transmission bandwidth due to addition of the leaf node is greater than the upstream boundary bandwidth, Determining that the adjustment of the current transmission bandwidth is unnecessary when the sum of the current transmission bandwidth and the additional transmission bandwidth is larger than the upstream boundary bandwidth, And determining that the current transmission bandwidth needs to be adjusted if the bandwidth is not greater than the upper boundary band. The reset upper boundary band may be a value obtained by adding the upper boundary band and the upper boundary band multiplied by the increasing ratio. Wherein the step of determining whether or not adjustment of the current transmission bandwidth is necessary includes the step of determining whether a value obtained by dividing the value obtained by subtracting the current transmission bandwidth from the upstream bandwidth by 100 is smaller than a usage efficiency Determining that the adjustment is necessary when the value obtained by dividing the value obtained by dividing the current transmission bandwidth by 100 and the usage efficiency is smaller than the usage efficiency and decreasing the current transmission bandwidth in the upper boundary band by 100, The utilization efficiency may be a value obtained by dividing the value obtained by subtracting the lower boundary band from the upper boundary band by 100, and judging that the adjustment is not necessary if the divided value is not smaller than the use efficiency . The reset downlink boundary band may be a value obtained by subtracting the downlink boundary band multiplied by the reduction ratio in the downlink boundary band.

According to another aspect of the present invention, there is provided an apparatus for adjusting a transmission bandwidth in a point-to-multipoint (P2MP) packet transmission system, the apparatus including a processor, The processor determines whether adjustment of the current transmission bandwidth due to the merging of the label switched path (LSP) is necessary if the leaf node is added or reduced, and if the adjustment is necessary, Determining a lower bounding band of the current transmission bandwidth as a reset lowering boundary band, and determining a merged OAM based on the merging of the LSPs through the reset upper boundary band and the reset lowering boundary band, & Maintenance packets. Wherein the processor determines whether a bandwidth of the current transmission bandwidth plus an additional transmission bandwidth due to addition of the leaf node is larger than the upstream boundary bandwidth and adds the current transmission bandwidth and the additional transmission bandwidth Determines that the adjustment of the current transmission bandwidth is unnecessary when the sum of the current transmission bandwidth and the additional transmission bandwidth is larger than the upper boundary band, It can be determined that adjustment of the transmission bandwidth is necessary. The reset upper boundary band may be a value obtained by adding the upper boundary band and the upper boundary band multiplied by the increasing ratio. Wherein when the leaf node is deleted, the processor determines whether a value obtained by dividing the value obtained by subtracting the current transmission bandwidth from the upstream bandwidth by 100 is smaller than the usage efficiency, and subtracts the current transmission bandwidth from the upstream bandwidth When the value obtained by dividing the value by 100 is smaller than the use efficiency, it is determined that the adjustment is necessary, and when the value obtained by dividing the value obtained by subtracting the current transmission bandwidth from the upper boundary band by 100 is not smaller than the use efficiency, The use efficiency may be a value obtained by dividing the value obtained by subtracting the lower boundary band from the upper boundary band by 100. [ The reset downlink boundary band may be a value obtained by subtracting the downlink boundary band multiplied by the reduction ratio in the downlink boundary band.

As described above, according to the embodiment of the present invention, when a leaf node is added or reduced by using a method and apparatus for adjusting a transmission bandwidth in a P2MP packet transmission system, adjustment of a transmission bandwidth due to merging of a label switched path (LSR) . By using this method, when adding or deleting leaf nodes in the P2MP packet transmission system of the MPLS-TP network, the bandwidth setting up to the root node is not newly performed every time, but only when a range bandwidth is set, Resetting can be performed. Also, the reference value for bandwidth resetting can be automatically changed according to the reference value set by the user, thereby preventing the deterioration of the reference value due to long-term operation, thereby providing a stable service while reducing the load of the network operation.

1 is a conceptual diagram illustrating an MPLS-TP based carrier Ethernet delivery network.
2 is a conceptual diagram illustrating a method of merging OAM packets in P2MP transmission according to an embodiment of the present invention.
3 is a flowchart illustrating a bandwidth setting method according to an embodiment of the present invention.
4 is a flowchart illustrating a method of determining an upstream boundary bandwidth according to an embodiment of the present invention.
5 is a flowchart illustrating a method for determining a downlink boundary bandwidth according to an embodiment of the present invention.
6 is a conceptual diagram illustrating an apparatus for determining LSP bandwidth reset according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Hereinafter, the same reference numerals will be used for the same constituent elements in the drawings, and redundant explanations for the same constituent elements will be omitted.

1 is a conceptual diagram illustrating an MPLS-TP based carrier Ethernet delivery network.

Referring to FIG. 1, a multi-protocol label switching (TP) -transfer profile based carrier Ethernet delivery network includes a provider edge node (PE) that connects a backbone network and a customer network, And a label switch router (LSR) node for providing a line connection function in the backbone network. The PE node may be located in the edge region of the backbone network. The PE node may be connected to a customer edge (CE) node. The PE node may attach a label to the MPLS frame and forward it to the backbone network.

The label switching router (LSR) is located in the core region of the backbone network and can transmit a label-attached frame received from the PE node to another LSR or another PE node. A virtual line LSP (label switched protocol) can be set dynamically / statically between PE node ends.

The nodes constituting the backbone network such as the LSP established between the PEs can be provisioned by the control protocol or directly by the administrator. An LSP path is established based on all the topology information of the backbone network, and a maintenance association endpoint (MEP) and a RMEP (Remote MEP) are generated between the edge nodes of the established LSPs to periodically transmit an end-to-end CCM (Continuity Check Message). The RMEP receives the CCM message transmitted by the MEP and monitors the LSP connection status. If a node or link located in the established path fails, the RMEP can not receive the CCM message, and if it can not receive more than 3 CCM messages, it determines that there is an error in the link of the corresponding LSP. Speed LSP protection switching function that switches to a backup link within 50ms of the LSP.

When traffic transmitted from different N sources is transmitted toward one target, the traffic can be merged and transmitted. In order to merge and transmit traffic, it is necessary to be able to distinguish between reservation of resources for transmitting merged traffic and correct starting source (address) of merged traffic. Currently, MPLS-TP does not take these points into consideration when transmitting merged traffic.

The traffic merging method is also used in other networks (e.g., linear protection switching (e.g., 1 + 1 SDH VC-n SNC / N, 1: 1 ODUk SNC / S) Rooted Multipoint) and MP2MP Ethernet VC (Virtual Connection).

Provides reliability through OAM-Operations, Administration, and Maintenance of the Ethernet network and fault protection switching function, and supports Ethernet scalability management with Provider Backbone Bridge (PBB) / Provider Backbone Bridge-Traffic Engineering (PBB-TE) You can provide sex. In PBB-TE technology, peer-to-peer Evolved Packet System (EPS) connection can be made through MP2P EPS lower layer connection. MP2P EPS lower layer connectivity can be used to improve the scalability of P-node switching tables in PBB-TE. All monitoring according to MP2P connection merge can be done according to the basic P2P EPS connection.

MPLS (-TP), for example, can use label-switched path (LSP) -based traffic merging in the following cases. It is assumed that there are N PE nodes interconnected by the entire mesh of P2P edge-to-edge LSPs. Each E2E LSP is mapped to an MP2P E2E tunnel LSP (N-1 input ports, one output port) and the label field value in the P2P E2E LSP packet taken from each label stack entry header is unique in MP2P Must have. The label field of each MP2P edge-to-edge tunnel (E2ET) LSP packet can obtain the header of a label stack entry having a value that distinguishes the E2ET LSP from one of the other E2ET LSPs. It can be transmitted according to the LSP label value. The receiving PE can uniquely identify the LSP packet to each P2P edge through the corresponding packet forwarding to this criterion. MP2P E2ET LSP connectivity can be monitored for connectivity and continuity problems using a properly designed CC / CV OAM (such as CCM OAM). Normally, the following MP2P E2ET LSP connection can not be monitored for packet loss. However, it does not matter if you can monitor packet loss on a P2P E2E LSP connection.

When performing connection merge, management of bandwidth (BW) is required. The BW (physical media) resource is divided into small pieces, and the fragment is assigned to the transmission path of each transmission path layer (that is, E2E LSP), so that each VP connection obtains BW. It then assigns a fragment of the BW of each VP to the transport service layer transport path (for example, MS-PW, Service-LSP). In addition, it may not fragment BW resources per transmission path layer transmission path, that is, E2E LSPs may simply be used as extended transmission entities of the domain and have unspecified BWs. Thereafter, a portion of each resource BW may be allocated to a transport service layer transport path (such as an MS-PW or a service LSP).

When performing the label switched path (LSP) based traffic merging, a bandwidth setting problem may exist. The bandwidth of the LSP from the LSR to the root node between the leaf node and the root node must be able to be allocated to the merged traffic. Only the OAM packet of MP2P is merged and transmitted, so that only the bandwidth necessary for OAM packet transmission can be secured. Therefore, it is necessary to set the bandwidth of the merged LSP to the sum of the bandwidth required for the OAM packet transmission for each LSP to be merged.

Also, if a leaf node is added or deleted, the bandwidth of the LSP must be reconfigured by reducing the bandwidth set for the added or deleted leaf node. If the bandwidth is reset every time the leaf node is added or deleted, the unnecessary processing may occur.

According to the embodiment of the present invention, in order to solve the problem of the bandwidth setting according to the merging of LSPs, in the P2MP packet transmission service of the MPLS-TP network, when adding or deleting leaf nodes, After the value is set, resetting can be performed only when the reference value deviates from a certain range. By using this method, it is possible to reduce the number of bandwidth resetting due to addition or deletion of a leaf node. In addition, if the reference value for bandwidth resetting deviates from the range set by the manager, the reference value may be automatically changed to prevent the deterioration of the reference value due to long-term operation.

Hereinafter, a method of merging OAM packets in the P2MP packet transmission service will be described in the embodiment of the present invention.

2 is a conceptual diagram illustrating a method of merging OAM packets in a P2MP packet transmission service according to an embodiment of the present invention.

Referring to FIG. 2, in a label switched router (LSR) between a root node and a leaf node, OAM packets transmitted from a leaf node to a root node are merged to form a single merged LSP path through the bandwidth of the.

In order to merge these OAM packets, it is necessary to judge whether or not the merging of OAM packets is possible. For example, if the following criteria are met, the OAM packets can be merged. It is also possible to use the term data packet (or data) in terms including OAM packets.

1) The LSR shall support the merging of OAM packets.

2) It must be able to process merged OAM packets at the root node.

3) The transmission bandwidth of the LSP destined for the root node must be a bandwidth capable of transmitting the merged OAM packet.

4) There should be BFD control packet information in OAM packet.

5) Your discriminator information should be the same as the information of the root node in the BFD control packet information.

6) My discriminator information in the BFD control packet information should be the same as the leaf node information.

Referring again to FIG. 2, in-band transmitted from leaf nodes G (400), H (405), I (410), J (415), and K (420) Band OAM packets are LSP merged at the LSRs B (440), D (425) and F (435) and transmitted to the root node A (450). Specifically, the in-band OAM packets transmitted from leaf node G 400 and leaf node H 405 can be LSP merged at LSR D 425. The in-band OAM packets transmitted at leaf node J 415 and leaf node K 420 may be merged into LSPs at LSR F 435. The in-band OAM packets transmitted at leaf node D 425 and leaf node E 430 may be merged into LSPs at LSR B 440. In this way, the in-band OAM packets transmitted from the plurality of leaf nodes can be transmitted to the root node A 450 through the LSP merge.

Assuming that there is no leaf node K 420 added, the bandwidth can be reset according to the addition of the leaf node K 420. For example, a new bandwidth for the K (420) -F (435) path must be set to transmit an in-band OAM packet that leaf node K 420 transmits.

If the bandwidth set in the path F (435) -C (445) -A (450) is bandwidth sufficient to transmit an in-band OAM packet due to the addition of the leaf node K 420, It may not be necessary. Conversely, if the bandwidth set in the F (435) -C (445) -A (450) path is not sufficient to carry in-band OAM packets due to the addition of leaf node K 420, May need to be reset.

If the transmission bandwidth between the LSRs is set to be large enough to allow a new merged in-band OAM packet to be added to the leaf node, the number of re-establishment can be reduced. Conversely, if the transmission bandwidth between basic LSRs is set large, a waste of bandwidth may occur. That is, it is possible to increase the network efficiency by finding the optimal transmission bandwidth and adjusting the transmission bandwidth size as necessary. It is necessary to set the optimum transmission bandwidth close to the optimum value based on the ratio of efficiency of the preset bandwidth and the bandwidth re-setting ratio.

3 is a flowchart illustrating a bandwidth resetting method according to an embodiment of the present invention.

Referring to FIG. 3, it is determined whether a leaf node is added or deleted (step S300).

When a leaf node is added or deleted, it is necessary to adjust the transmission bandwidth of the LSP. Accordingly, whether or not a leaf node is added or deleted can be determined, and it is possible to determine whether or not a bandwidth reset such as a change of an upper boundary band or a lower boundary band is necessary.

If a leaf node is added, it is determined whether or not bandwidth resetting is necessary (step S310).

If a leaf node is added, the in-band OAM packet transmitted from the added leaf node may be further merged and transmitted through the LSP. It is possible to judge whether the size of the transmission bandwidth of the established LSP is the size of the bandwidth in which the merged in-band OAM packet can be transmitted due to the addition of the leaf node. If the merged in-band OAM packet can be transmitted due to the leaf node addition through the transmission bandwidth of the previously set LSP, the reconfiguration of the transmission bandwidth is not necessary and the bandwidth resetting procedure may be terminated.

If the merged in-band OAM packet can not be transmitted due to the addition of the leaf node through the transmission bandwidth of the established LSP, the transmission bandwidth of the LSP can be reset.

This determination method is one example of determining whether additional bandwidth is needed and may determine whether additional bandwidth is needed based on another determination method. For example, even if an in-band OAM packet is added because a leaf node is added based on the transmission bandwidth of the existing LSP, the combined in-band OAM packet is transmitted. If the remaining bandwidth is less than the threshold value , The upper boundary bandwidth (High_bw) may be reset.

The upper boundary bandwidth (High_bw) is reset (step S320).

The upstream boundary bandwidth may be a reference value of the maximum allowable bandwidth in the currently set path. If it is determined in step S310 that the transmission bandwidth of the LSP needs to be reset, the process of resetting the upstream boundary bandwidth may be performed. The upstream boundary bandwidth may be determined based on a preset increment ratio inc_ratio. The rate of increase may be a rate to change the size of the upstream boundary bandwidth. A method of resetting the upstream boundary bandwidth will be described later.

If the upstream boundary bandwidth and the downstream boundary bandwidth (Low_bw) are dependent on, the upstream boundary bandwidth as well as the downstream boundary bandwidth can be reset. For example, the downstream boundary bandwidth may be a value obtained by multiplying the upstream boundary bandwidth by a predetermined utilization efficiency (Util_rate). The bandwidth determined based on the upstream boundary bandwidth or the downstream boundary bandwidth reconstructed in this manner is referred to as a reset bandwidth.

And transmits the merged in-band OAM packet through the reset bandwidth (step S330).

It may transmit the merged in-band OAM packet through the reset bandwidth based on step S320.

On the contrary, if it is determined in step S300 that the leaf node is deleted, it is determined whether or not bandwidth re-setting is necessary (step S340).

When the leaf node is deleted, the efficiency of network resources can be increased by reducing unnecessary transmission bandwidth. As a result of the determination in step S300, when the leaf node is deleted, if the resetting of the downstream boundary bandwidth is not necessary, the bandwidth reset procedure can be terminated. On the contrary, if it is determined in step S300 that the leaf node is deleted and the downlink bandwidth needs to be reset, the downlink bandwidth resetting can be performed.

And performs resetting of the downstream boundary bandwidth (step S350).

If a reset of the downstream boundary bandwidth is required, the downstream boundary bandwidth can be reset by performing a reset process of the downstream boundary bandwidth. The downstream boundary bandwidth may be the size of the minimum supported bandwidth in the LSP. That is, when the leaf node is decreased, the downlink boundary bandwidth that is minimally supported can be reset in proportion thereto. The downstream boundary bandwidth may be determined based on a predetermined reduction rate (dec_ratio). The reduction ratio may be a ratio for determining the size of the bandwidth to be returned. A method of calculating the downlink boundary bandwidth will be described later.

As described above, the downlink boundary bandwidth and the uplink boundary bandwidth can be determined depending on the utilization efficiency (Util_rate), and the uplink boundary bandwidth can also be reset according to the resetting of the downlink boundary bandwidth. The bandwidth determined based on the upstream boundary bandwidth or the downstream boundary bandwidth reconstructed in this manner is referred to as a reset bandwidth.

And transmits the merged in-band OAM packet through the re-established bandwidth (step S360).

The data can be transmitted through the reset bandwidth based on step S350.

If the value of the bandwidth range (Range_bw), which is a difference value between the uplink boundary bandwidth (High_bw) and the downlink boundary bandwidth (Low_bw), is set large, the bandwidth is not reset frequently but the unused bandwidth becomes large and the network efficiency becomes worse . Conversely, if the value of the bandwidth range becomes too small, the reconfiguration of the bandwidth frequently occurs and the efficiency of operation may deteriorate.

When the value of the bandwidth range (Range_bw) is determined by the utilization efficiency (Util_rate), it is important to appropriately determine the usage efficiency to improve the network efficiency. Also, according to the embodiment of the present invention, the range of the bandwidth to be additionally set according to the addition or deletion of the leaf node may be determined based on the increase ratio inc_ratio and the range of the bandwidth to be decreased based on the decrease ratio dec_ratio. That is, when a leaf node is added or deleted, the bandwidth reset range can be automatically determined.

4 is a flowchart illustrating a method of determining an upstream boundary bandwidth according to an embodiment of the present invention.

Referring to FIG. 4, it is determined whether a sum of a currently used transmission bandwidth and a newly required transmission bandwidth is greater than a current upper bounding bandwidth (step S400).

It is possible to determine whether to reset the upstream boundary bandwidth by determining whether the current transmission bandwidth plus the newly added transport bandwidth due to leaf node addition is greater than the currently established upstream bandwidth.

The procedure can be terminated if the current transmission bandwidth plus the newly added transport bandwidth due to leaf node addition is not greater than the currently set upstream bandwidth.

If the value of the current transmission bandwidth plus the new required transmission bandwidth due to leaf node addition is larger than the currently set upper boundary bandwidth, the reset upper boundary bandwidth may be determined (step S450).

The reset upstream boundary bandwidth may be the current upstream boundary bandwidth plus the current upstream boundary bandwidth multiplied by the increasing rate. The increase rate can be determined depending on the number of added leaf nodes. The rate of increase may be a predetermined value. If the upstream boundary bandwidth is reset, the downstream boundary bandwidth can also be reset based on the usage efficiency.

That is, according to the embodiment of the present invention, when the leaf node is added in the P2MP packet transmission system, it is possible to set the return path bandwidth according to the leaf node. Specifically, when a leaf node is added to a service P2MP packet transmission system, the bandwidth of the return path to be used by the added leaf node can be additionally set or shared with the existing bandwidth.

If the sum of the new transmission bandwidths (new_bw) required for the currently used transmission bandwidth (Current_bw) is smaller than the established upper boundary bandwidth (High_bw), the existing set bandwidth can be shared and used. Conversely, if the sum of the new bandwidth (new_bw) required for the currently used bandwidth (Current_bw) is not smaller than the preset upper boundary bandwidth (High_bw), the upper boundary bandwidth can be reset. At this time, the additional bandwidth to be set can be calculated according to the previously set ratio inc_ratio without resetting the upstream boundary bandwidth only reflecting the newly requested bandwidth. By using this method, it is possible to reset the upstream boundary bandwidth more freely than the newly required bandwidth, and not to perform the procedure of resetting the upstream boundary bandwidth again whenever a new leaf node is added.

5 is a flowchart illustrating a method for determining a downlink boundary bandwidth according to an embodiment of the present invention.

Referring to FIG. 5, it is determined whether a value obtained by dividing the value obtained by subtracting the currently used transmission bandwidth from the upstream boundary bandwidth by 100 is smaller than the usage efficiency (step S500).

It can be determined whether or not the currently set downboundary bandwidth is set to be unnecessarily large through the determination in step S500. The utilization efficiency can be calculated by dividing the value obtained by subtracting the lower boundary bandwidth from the upper boundary bandwidth by 100.

If the value obtained by dividing the value obtained by subtracting the transmission bandwidth used in the upstream boundary bandwidth by 100 is not smaller than the usage efficiency, the process can be terminated without re-adjusting the currently set downstream boundary bandwidth.

On the contrary, if the value obtained by dividing the value obtained by subtracting the transmission bandwidth used in the upstream boundary bandwidth by 100 is smaller than the usage efficiency, the currently set downstream boundary bandwidth can be readjusted (step S550).

The resolved downlink boundary bandwidth can be determined by subtracting the downlink bandwidth from the current downlink boundary bandwidth times the declination rate (dec_ratio). If the downstream boundary bandwidth is reset, the upstream boundary bandwidth can also be reset based on the usage efficiency.

That is, in order to downsize the regression path bandwidth according to the deletion of the leaf node in the P2MP packet transmission system according to the embodiment of the present invention, the bandwidth used by the leaf node may be returned to reset the downlink bandwidth in the existing bandwidth. Even if the leaf node is deleted, resetting the downlink bandwidth based on the size of the currently set upper bounding bandwidth (High_bw), the size of the currently used transmission bandwidth (current_bw), and the usage efficiency without resetting the downlink boundary bandwidth You can decide whether you need it or not. By using this method, unnecessary processing can be reduced by not performing the downlink bandwidth reset procedure every leaf node deletion.

FIG. 6 is a conceptual diagram illustrating an apparatus for performing LSP band reset determination according to an embodiment of the present invention. Referring to FIG.

FIG. 6 shows an LSP band re-setting device for determining whether to reset the LSP band according to the LSP merging. The LSP band-reset device may be a device such as an LSR.

The LSP band reset determination apparatus includes a leaf node add / delete determiner 600, a bandwidth reset determiner 610, an upper border band determiner 620, a lower border band determiner 630, and a processor 650 .

The leaf node add / delete determiner 600 may be implemented to determine whether a leaf node is added or deleted in the P2MP packet transmission system. It is possible to determine whether or not to reset the bandwidth according to whether or not to add or delete the leaf node of the leaf node add / delete determining unit.

When the leaf node is added or deleted, the bandwidth reset determination unit 610 can determine whether to reset the bandwidth in the current bandwidth. 3, when a leaf node is added, the bandwidth resetting determination unit 610 determines whether a value obtained by adding a new bandwidth required due to the addition of the current transmission bandwidth and the leaf node is greater than a currently set uplink boundary bandwidth You can decide whether to reset the bandwidth.

5, when the leaf node is deleted, the bandwidth resetting determination unit 610 determines whether a value obtained by dividing the value obtained by subtracting the currently used bandwidth from the upstream edge bandwidth by 100 is less than the usage efficiency, You can decide whether to reset the bandwidth.

The upper boundary band determining unit 620 may determine a reset upper boundary band when a leaf node is added and a bandwidth re-determination is determined according to the determination of the bandwidth re-determining unit. The reset upstream boundary bandwidth may be the current upstream boundary bandwidth plus the current upstream boundary bandwidth multiplied by the increasing rate.

In addition, the upper boundary band determining unit 620 may determine the reset upper boundary band when the leaf node is deleted and the bandwidth re-determination is determined according to the determination of the bandwidth re-determining unit. The reset upper boundary band may be a value obtained by multiplying the reset lower boundary band by the use efficiency. That is, the lower boundary band due to the deletion of the leaf node may be reset and the reset upper boundary band may be reset according to the reset lower boundary band.

The downstream boundary band determiner 630 can determine the reset downstream boundary band when the leaf node is deleted and the bandwidth re-determination is determined according to the determination of the bandwidth re-determining unit. Reset The downlink boundary bandwidth may be the current downlink boundary bandwidth minus the current downlink boundary bandwidth times the reduction ratio.

In addition, the downstream boundary band determining unit 630 may determine a reset downward boundary band when a leaf node is added and a bandwidth re-determination is determined according to the determination of the bandwidth re-determining unit. The reset lower boundary band may be the value of the reset upper boundary band multiplied by the use efficiency. That is, the upper boundary band due to the addition of the leaf node may be reset and the reset lower boundary band may be reset according to the reset upper boundary band.

The processor 650 may be implemented to control operations of the leaf node add / delete determiner 600, the bandwidth reset determiner 610, the upper boundary band determiner 620, and the lower boundary band determiner 630 have.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. It will be possible.

Claims (10)

A method of adjusting a transmission bandwidth in a point-to-multipoint (P2MP) packet transmission system,
Determining whether adjustment of a current transmission bandwidth due to merging of a label switched path (LSP) is necessary if a leaf node is added or reduced;
Determining an upper boundary band of the current transmission bandwidth as a reset upper boundary band and a lower boundary band of the current transmission bandwidth as a reset lower boundary band when the adjustment is necessary; And
And transferring an operation, administration & maintenance (OAM) packet merged based on the merging of the LSPs through the re-setting upper boundary band and the reset lower boundary band. 2. The method of claim 1, wherein the step of determining whether adjustment of the current transmission bandwidth is necessary comprises:
Determining whether a sum of the current transmission bandwidth and an additional transmission bandwidth due to addition of the leaf node is greater than the upstream boundary bandwidth when the leaf node is added;
Determining that the adjustment of the current transmission bandwidth is not necessary when the sum of the current transmission bandwidth and the additional transmission bandwidth is greater than the upstream boundary bandwidth; And
And determining that the current transmission bandwidth needs to be adjusted if the combined bandwidth of the current transmission bandwidth and the additional transmission bandwidth is not greater than the upper boundary bandwidth. 3. The method of claim 2,
Wherein the reset upper boundary band is a value obtained by multiplying an upper boundary band and an upper boundary band by an increasing ratio, and determining a transmission bandwidth in the P2MP packet transmission system. 2. The method of claim 1, wherein the step of determining whether adjustment of the current transmission bandwidth is necessary comprises:
Determining whether a value obtained by dividing a value obtained by subtracting the current transmission bandwidth from the upstream boundary band by 100 is less than an efficiency of use when the leaf node is deleted;
Determining that the adjustment is necessary when a value obtained by dividing the value obtained by subtracting the current transmission bandwidth from the upstream bandwidth by 100 is smaller than the usage efficiency; And
Determining that the adjustment is unnecessary if the value obtained by dividing the value obtained by subtracting the current transmission bandwidth from the upstream bandwidth by 100 is not smaller than the usage efficiency,
Wherein the use efficiency is a value obtained by dividing a value obtained by subtracting the downward boundary band from the uplink boundary band by 100, and determining a transmission bandwidth in the P2MP packet transmission system. 5. The method of claim 4,
Wherein the reconfigured downlink boundary band is a value obtained by subtracting a downlink bandwidth from a downlink bandwidth by a decrease rate in a downlink boundary band. An apparatus for adjusting a transmission bandwidth in a point-to-multipoint (P2MP) packet transmission system, the apparatus comprising a processor,
The processor determines whether adjustment of the current transmission bandwidth due to the merging of the LSP (label switched path) is necessary when the leaf node is added or reduced,
Determining an upper bounding band of the current transmission bandwidth as a reset upper boundary band and a lowering boundary band of the current transmission bandwidth as a reset lowering boundary band,
Wherein the reconfigurable upstream boundary band and the reconfigured downlink boundary band are configured to transmit the merged operation, administration & maintenance (OAM) packet based on the merging of the LSPs. 7. The apparatus of claim 6,
Determining whether a sum of the current transmission bandwidth and an additional transmission bandwidth due to the addition of the leaf node is greater than the upstream boundary band when the leaf node is added,
If it is determined that the adjustment of the current transmission bandwidth is not necessary if the bandwidth of the current transmission bandwidth plus the additional transmission bandwidth is larger than the upstream bandwidth,
Wherein the controller determines that the current transmission bandwidth needs to be adjusted if the combined bandwidth of the current transmission bandwidth and the additional transmission bandwidth is not greater than the upstream bandwidth. 8. The method of claim 7,
Wherein the reconfigurable upper boundary band is a value obtained by multiplying an upper boundary band and an upper boundary band by an increasing ratio. 7. The apparatus of claim 6,
Determining whether a value obtained by dividing the value obtained by subtracting the current transmission bandwidth from the upstream boundary band by 100 is less than an efficiency of use when the leaf node is deleted,
If the value obtained by dividing the value obtained by subtracting the current transmission bandwidth from the upstream bandwidth by 100 is smaller than the usage efficiency,
When the value obtained by dividing the value obtained by subtracting the current transmission bandwidth from the upstream bandwidth by 100 is less than the usage efficiency, it is determined that the adjustment is not necessary,
Wherein the use efficiency is a value obtained by dividing a value obtained by subtracting the lower boundary band from the upper boundary band by 100. 10. The method of claim 9,
Wherein the reconfigurable downlink boundary band is a value obtained by subtracting a downward boundary band from a downlink band by a reduction ratio.

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