Summary of the invention
The embodiment of the invention provides a kind of method for uploading, system and server of network element historical performance data; In order to the network element device that solves EMS management in the prior art when uploading History Performance Data and give EMS; When network element device One's name is legion or History Performance Data amount are big; Cause the network congestion of network element gateway, the data-bag lost that network element device is uploaded easily, even cause network element to take off the defective that the pipe situation occurs, realize the mode that a kind of more History Performance Data of the network element of optimization is uploaded.
To achieve these goals, the embodiment of the invention provides a kind of method for uploading of network element historical performance data, comprising:
At least one subnet server that is arranged between network element device and the NM server receives History Performance Data in the corresponding subnet, that at least one network element device is uploaded; And storing said History Performance Data, the subnet of said correspondence comprises at least one subnet in a plurality of subnets of network;
When said subnet server receives the network element data query requests of said NM server transmission, the said History Performance Data that stores is sent to said NM server;
Said at least one subnet server that is arranged between network element device and the NM server receives before the History Performance Data in the corresponding subnet, that at least one network element device is uploaded, and said method also comprises:
Said NM server sends to said subnet server corresponding net element equipment with the IP address of said subnet server, gives said subnet server so that said corresponding net element equipment sends said History Performance Data according to said IP address.
To achieve these goals, the embodiment of the invention also provides a kind of NM server, comprising:
Second sending module is used to send the network element data query requests and gives and to be arranged at least one subnet server between network element device and the NM server, and at least one subnet in a plurality of subnets of said subnet server and network is corresponding;
Second receiver module is used to receive the History Performance Data that said subnet server returns, and said History Performance Data is that said subnet server receives from the network element device in said at least one subnet of correspondence;
The 3rd sending module is used for the IP address with said subnet server, sends to the corresponding said network element device of said subnet server, gives said subnet server so that said network element device is uploaded said History Performance Data according to said IP address.
To achieve these goals, the embodiment of the invention also provides a kind of uploading system of network element historical performance data, comprising: a plurality of subnet servers, above-mentioned NM server and a plurality of network element device; Wherein,
Said a plurality of network element device is the network element device in the arbitrary subnet in a plurality of subnets in the network, and said subnet server is corresponding with at least one subnet in said a plurality of subnets;
Said subnet server is arranged between said a plurality of network element device and the said NM server, and said subnet server comprises:
Receiver module is used to receive History Performance Data in the corresponding said subnet, that at least one network element device is uploaded, and stores said History Performance Data;
First sending module is used for when receiving the network element data query requests of NM server transmission, the said History Performance Data that stores being sent to said NM server.
The method for uploading of the network element historical performance data of the embodiment of the invention, system and server; Through whole network is divided into different subnets; And a plurality of subnet servers corresponding with different subnets are set between network element device and NM server; Each subnet server is responsible for receiving the History Performance Data of the network element device transmission in the corresponding subnet and is stored; Be uploaded to NM server again; Thereby make former network element gateway can be distributed to each sub-net server, even if under the bigger situation of History Performance Data amount numerous at network element device, that upload, also can avoid network congestion, data-bag lost, network element to take off the appearance of tubulose condition effectively to the forwarding pressure of the History Performance Data of all network element devices.Further, each subnet server has also slowed down the pressure that NM server is stored and managed mass data to a certain extent to the temporary transient storage of the History Performance Data uploaded.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer; To combine the accompanying drawing in the embodiment of the invention below; Technical scheme in the embodiment of the invention is carried out clear, intactly description; Obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Fig. 1 is the flow chart of the method for uploading embodiment one of network element historical performance data of the present invention, and as shown in Figure 1, the method for present embodiment comprises the steps:
Step 100, at least one subnet server that is arranged between network element device and the NM server receives History Performance Data in the corresponding subnet, that at least one network element device is uploaded, and stores this History Performance Data;
In order to estimate the recent performance of transmission system; Analyzing and positioning fault and the position of confirming interrupted error code source; International Telecommunications Union's telecommunication standards group (International Telecommunications Union Telecommunication Standardization Sector; Abbreviation ITU-T) requires each network element device in the network is carried out the management of performance in the suggestion; Promptly require the performance data of all network element devices in the network to be gathered and analyzed, to grasp the running status of whole network through NM server is set.In the existing technology; The mode of the History Performance Data of each network element device of NM server collection is generally network element device and generates History Performance Data; Be kept in the performance management module of current network equipment, pass through NM server through the network element gateway in unified concentrated area, period of performance end.But thisly concentrate the mode of transparent transmission to exist very big defective to a certain extent: when network element device One's name is legion that NM server is managed through the network element gateway; Receive the restriction of bandwidth; The network element gateway is being concentrated the performance data of network element device when being transmitted to NM server; Probably network congestion, data-bag lost can be occurred, even the phenomenon that network element device takes off pipe can be occurred.
The problem that occurs when solving the History Performance Data of existing NM server acquisition network element equipment; In the present embodiment; Between NM server and network element device, add being provided with the subnet server, this subnet server is responsible for the History Performance Data of all network element devices in its corresponding subnet is gathered.Particularly, in the present embodiment, with the whole network based different network segment, section, perhaps the division principle according to other is divided into a plurality of subnets, and is that each subnet is independent, perhaps every several sub-net have disposed a sub-net server jointly.The History Performance Data of all network element devices all unifies to be uploaded to its corresponding subnet server in each subnet; By this subnet server it is preserved and manages; When NM server needs; By this subnet server it is reported NM server again, it is analyzed for NM server.
Thus; The mode that the performance data of network element device is uploaded in the network no longer is that unification is uploaded to NM server through the network element gateway; For the gateway device that belongs to the different sub-network server, its destination of uploading History Performance Data is also inconsistent, and the different gateway devices that belongs to the different sub-network server sends to different subnet servers with its History Performance Data; Than original network element gateway, greatly alleviated the bandwidth pressure that data forwarding is carried out in the unification of original network element gateway.In fact; This data upload mode is equivalent to the task of receiving and transmitting the History Performance Data that network element device uploads; With the form that subnet is divided, a plurality of subnet servers have been distributed to equably, the size of the forwarding data volume that each subnet server need be born and the required bandwidth pressure of bearing; For former network element gateway, all obtained slowing down greatly.
Correspondingly; In the present embodiment; For the subnet server of being responsible at least one subnet, behind the History Performance Data that its network element device in receiving corresponding subnet sends, be not as the existing elements gateway; Directly it is transmitted to NM server, but this History Performance Data is temporarily stored.The purpose that the subnet server is kept in the data that receive is: the History Performance Data required to NM server carries out temporary transient buffer memory and management;, NM server sends NM server when need analyzing it again to; This is equivalent to partly bear the pressure that NM server is managed a large amount of History Performance Datas to a certain extent, has slowed down the memory consumption that NM server is stored and managed mass data.
Step 101 when this subnet server receives the network element data query requests of NM server transmission, sends to NM server with the History Performance Data that stores.
Each subnet server receives the History Performance Data that the network element device in the subnet corresponding with it is uploaded, and after it was stored, NM server just can obtain its required performance data to analyze from each subnet server.Particularly; When NM server need be when the subnet server obtains its required data; To send the network element data query requests and give each subnet server; When the subnet server receives the query requests of NM server transmission, the History Performance Data that receives before and preserve is returned to NM server, thereby just accomplished the collection of History Performance Data this time of NM server.In fact; In embodiments of the present invention; NM server can be regarded each subnet server as the data storage of the special use of its set inside; Need be through the data of wherein storage are analyzed, and then when understanding the respective network elements equipment running, can from corresponding data storage, it be extracted.
The method for uploading of the network element historical performance data of present embodiment; Through whole network is divided into different subnets; And a plurality of subnet servers corresponding with each subnet are set between network element device and NM server; Each subnet server is responsible for receiving the History Performance Data of the network element device transmission in the corresponding subnet and is stored; Be uploaded to NM server again; Thereby make former network element gateway can be distributed to each sub-net server, even if under the bigger situation of History Performance Data amount numerous at network element device, that upload, also can avoid network congestion, data-bag lost, network element to take off the appearance of tubulose condition effectively to the forwarding pressure of the History Performance Data of all network element devices.Further, each subnet server has also slowed down the pressure that NM server is stored and managed mass data to a certain extent to the temporary transient storage of the History Performance Data uploaded.
Fig. 2 is the flow chart of the method for uploading embodiment two of network element historical performance data of the present invention, and as shown in Figure 2, the method for present embodiment comprises the steps:
Step 200, NM server are sent the IP address of each subnet server and are given each network element device corresponding with this subnet server;
Particularly; This step is before NM server carries out the collection of History Performance Data to all network element devices of its management; Promptly, NM server carries out in carrying out the layoutprocedure of parameter of performance management to each network element device; Its purpose is to be the corresponding subnet of each subnet server-assignment that is provided with in the native system, and distributes corresponding net element equipment.Particularly; In the present embodiment, in order to alleviate the bandwidth pressure that the network element gateway receives and transmits the History Performance Data of all network element devices in the network, NM server is with the whole network based different network segment, section; Perhaps the division principle according to other has been divided into a plurality of subnets; And be each subnet, perhaps a few sub-net corresponding configuration one sub-net server, this subnet server is responsible for the History Performance Data of the network element device in its corresponding subnet is received and manages.
Therefore; In order to make each network element device in the network carry out History Performance Data when uploading; Can know the address of the destination that sends History Performance Data; Promptly in order to make each network element device understanding self corresponding with which subnet server, when each network element device in the network element was carried out the configuration of performance parameter, NM server was according to the scheme of concrete division subnet and distribution subnet server; Internet protocol (Internet Protocol the is called for short IP) address of each subnet server is sent to each network element device corresponding with this subnet server respectively.Thus; Network element devices all in the network all can be according to the IP address of this subnet server that receives; Learn and self belong to which subnet server; Thereby when reality is sent History Performance Data, can on corresponding subnet server, send according to the IP address of this subnet server that receives.
Step 201; NM server is to the corresponding different sub-network of each subnet server; Different pieces of information uplink time instruction with carrying the different very first time values and identical second time value sends to each network element device in the different sub-network corresponding with this subnet server;
Identical with above-mentioned steps 200; This step is equally before carrying out the collection of History Performance Data at NM server to all network element devices of its management; In NM server carries out the layoutprocedure of parameter of performance management to each network element device, carry out, its purpose is that with a sub-net server be the unit, is the concrete time scheme of uploading History Performance Data of each network element device configuration in this subnet server; Promptly when this network element device uploads data, with what kind of mode uploads.
Particularly; Though in embodiments of the present invention; All network element devices in the network have been divided into a plurality of subnets, and have been that each subnet is independent, perhaps every several sub-net have disposed a sub-net server jointly, and former network element gateway has been distributed to each sub-net server to the pressure that all network element devices carry out the forwarding of History Performance Data; And for a sub-net server, itself institute can data carried by data bandwidth also must be higher than former network element gateway.But; If sub-net server corresponding net element number of devices simultaneously is too many; Data volume is too big; It may possibly occur the situation of network congestion equally owing to excessive bandwidth pressure, and this situation especially possibly occur in when corresponding all network element devices of this subnet server when synchronization sends History Performance Data.
Therefore; In order further to slow down each subnet data in server bandwidth pressure; In the present embodiment, when NM server carries out the performance parameter configuration to each network element device, for all network element devices in the sub-net server; NM server is unit with the subnet, sends different data upload time command respectively and gives the network element device that belongs in the different sub-network.Carry the very first time value of representing initial uplink time and second time value of representing the time interval of adjacent twice data upload in this data upload time command; Be used to indicate each network element device after receiving this data upload time command; The different initial uplink time of representing with the very first time value of wherein carrying respectively; And, upload History Performance Data and give corresponding subnet server with the time interval that second time value is represented.
Particularly; In the present embodiment, in a sub-net server, the time of network element device being uploaded History Performance Data; With the subnet is that the purpose that unit staggers each other is: for each subnet server; It can bear certain bandwidth pressure, and even this subnet server is only corresponding with all network element devices of a sub-net, gives the subnet server even all network element devices of this subnet are uploaded History Performance Data simultaneously; This subnet server can sustain the pressure of data volume, can not cause network congestion, network element to take off the situation of pipe in the case usually.But; If a sub-net server is simultaneously corresponding to several sub-net; When network element devices all in these several sub-net is uploaded performance data simultaneously to this subnet server; Because network element device quantity significantly increases, data volume enlarges markedly, the situation of above-mentioned network congestion might appear in this subnet server.Therefore; This step is when carrying out the performance parameter configuration to network element device; For all corresponding network element devices of each subnet server, be unit with the subnet, be the different data upload time of the configuration of the network element device in the different sub-network; Make corresponding to the network element device of the different sub-network of a sub-net server is staggered and upload data, solved the limited problem of the corresponding a plurality of subnet Time Bandwidths of subnet server effectively.
Further, for second time value of carrying in the data upload time command that NM server in this step sends, on behalf of each network element device, it upload the time interval between adjacent two secondary data.And in embodiments of the present invention, this regular time at interval can be for being less than or equal to 4 hours.Because according to the ITUTG7710 standard; Usually network element device is to be the cycle in 15 minutes; Each cycle is uploaded a secondary data; And be provided with 16 registers in the network element device, and each register is deposited the History Performance Data of once going up crossing, and a network element device can be deposited all History Performance Datas of 16 cycle transmissions at most.Therefore this has shown that a network element device can store the History Performance Data of 15 minutes * 16=4 hour at most; And in the present embodiment; The adjacent time interval of uploading for twice of network element device is set to 4 hours; All History Performance Datas that can guarantee this network element device fully can both be uploaded to NM server, and can not produce the situation of data-bag lost.
Need to prove in addition; In the present embodiment; The step that the data upload time to network element device of this step is configured; And the above-mentioned step that the corresponding subnet server of network element device is configured can carry out simultaneously, also can carry out with time sequencing arbitrarily, and with which kind of time sequencing carry out all within the scope that the embodiment of the invention is protected.
Step 202, each network element device are uploaded History Performance Data at interval with different uplink times and regular time and are given corresponding subnet server according to the data upload time command that receives;
Send to the data upload time command of network element device in each subnet server according to NM server in the above-mentioned steps 201; And the IP address that sends to the corresponding subnet server of each network element device according to NM server in the above-mentioned steps 200; Each network element device will be according to the very first time value of carrying in its data upload time command that receives, with corresponding initial uplink time; And, regularly upload History Performance Data and give corresponding subnet server according to second time value of wherein carrying, with the regular time interval.If during the corresponding a plurality of subnet of a sub-net server; Network element device in the different sub-network carries out uploading of History Performance Data in the different time section; Thereby the data volume size that has guaranteed each subnet server History Performance Data that at every turn receive, that network element device is uploaded all is within the data bandwidth pressure limit that it can bear; And it is too congested can not produce the network bandwidth, and causes network element to take off the appearance of the situation of pipe.
Simultaneously; Former network element gateway has been distributed to each sub-net server to the forwarding pressure of the History Performance Data of all network element devices; Even if under the bigger situation of History Performance Data amount numerous at network element device, that upload, also avoided network congestion, data-bag lost, network element to take off the appearance of tubulose condition effectively.
Step 203, each subnet server after receiving the History Performance Data that each network element device in the corresponding subnet uploads store this History Performance Data;
After each subnet server receives the History Performance Data that each network element device in the corresponding subnet uploads; Directly it is not transmitted to NM server; But this History Performance Data is temporarily stored,, NM server sends NM server when need analyzing it again to.Thereby part has been born the pressure that NM server is managed a large amount of History Performance Datas to a certain extent, has slowed down the mass data storage of NM server and the pressure of management.A plurality of subnet servers are equivalent to the data storage that is exclusively used in each network element device History Performance Data of buffer memory of NM server set inside; When NM server need be analyzed the respective network elements equipment running, can from corresponding data storage, it be extracted.
Step 204, NM server sends the network element data query requests and gives each subnet server;
Step 205, each subnet server returns to NM server with the History Performance Data that stores.
Each subnet server receives the History Performance Data that the network element device in the subnet corresponding with it is uploaded, and after it was stored, NM server just can obtain its required performance data to analyze from each subnet server.Particularly; When NM server need be when the subnet server obtains its required data; Send the network element data query requests and give each subnet server; When each subnet server receives the query requests that NM server sends, the History Performance Data of its reception and preservation is returned to NM server, thereby just accomplished the collection of History Performance Data this time of NM server.
Need to prove; In embodiments of the present invention; The mode that NM server extracts the History Performance Data of each network element device of storing in each subnet server; Be generally and send the data query request regularly for uniformly all subnet servers, thereby obtain the History Performance Data of all network element devices.And in embodiments of the present invention; The concrete mode of carrying out data interaction between NM server and each the subnet server; Can adopt common network file host-host protocol to transmit; For example FTP (FileTransfer Protocol, be called for short FTP) or other the agreement that is suitable for carrying out between network file transfer.
The method for uploading of the network element historical performance data of present embodiment; Through whole network is divided into different subnets; And between network element device and NM server, be provided with and different each self-corresponding a plurality of subnet servers of subnet; Each subnet server is responsible for receiving the History Performance Data of the network element device transmission in the corresponding subnet and is stored; Be uploaded to NM server again; Thereby make former network element gateway can be distributed to each sub-net server, even if under the bigger situation of History Performance Data amount numerous at network element device, that upload, also can avoid network congestion, data-bag lost, network element to take off the appearance of tubulose condition effectively to the forwarding pressure of the History Performance Data of all network element devices.Further, each subnet server has also slowed down the pressure that NM server is stored and managed mass data to a certain extent to the temporary transient storage of the History Performance Data uploaded.Further; In the embodiment of the invention; All network element devices that each subnet server is corresponding are that unit divides the time period to carry out uploading of History Performance Data with the subnet, have also solved the limited problem of the corresponding a plurality of subnet Time Bandwidths of subnet server simultaneously effectively.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Fig. 3 is the structural representation of subnet server implementation example of the present invention; Particularly; Subnet server in the present embodiment is in the embodiment of the invention; Arbitrary subnet server in a plurality of subnet servers that between NM server and network element device, are provided with, and at least one subnet in a plurality of subnets of this subnet server and network is corresponding.As shown in Figure 3, the subnet server of present embodiment comprises: the receiver module 11 and first sending module 12.Particularly, receiver module 11 is used to receive History Performance Data at least one subnet corresponding with the subnet server of present embodiment, that at least one network element device is uploaded, and stores this History Performance Data; 12 of first sending modules are used for when receiving the network element data query requests of NM server transmission, the History Performance Data that stores being sent to NM server.
Particularly, in the present embodiment, the concrete course of work that all modules are related can repeat no more at this with reference to the related content of the related related embodiment exposure of the method for uploading of said network element History Performance Data.
The subnet server of present embodiment; Through being arranged between NM server and the network element device; Whole network is being divided on the basis of a plurality of subnets, corresponding with at least one subnet in a plurality of subnets after this is divided, and be responsible for receiving the History Performance Data that the network element device in the corresponding subnet sends and store; Be uploaded to NM server again; Thereby disperseed the forwarding pressure of former network element gateway, even if under the bigger situation of History Performance Data amount numerous at network element device, that upload, also can avoid network congestion, data-bag lost, network element to take off the appearance of tubulose condition effectively to the History Performance Data of all network element devices.Further, each subnet server has also slowed down the pressure that NM server is stored and managed mass data to a certain extent to the temporary transient storage of the History Performance Data uploaded.
Further; On the basis of above-mentioned embodiment; Receiver module in the subnet server of present embodiment can specifically can be first receiver module; Be used for receiving respectively each network element device in the corresponding different sub-network, with the History Performance Data that different uplink times and regular time upload at interval, this regular time is less than or equal to 4 hours at interval.
Equally, the related concrete course of work in the foregoing description scheme of present embodiment, the related content that can disclose with reference to the related related embodiment of the method for uploading of said network element History Performance Data repeats no more at this.
The above-mentioned embodiment of present embodiment is through making all corresponding network element devices of each subnet server; With the subnet is that unit divides the time period to carry out uploading of History Performance Data, has also solved the limited problem of the corresponding a plurality of subnet Time Bandwidths of subnet server simultaneously effectively.
Fig. 4 is the structural representation of NM server embodiment of the present invention, and as shown in Figure 4, the NM server of present embodiment comprises: second sending module 21 and second receiver module 22.Wherein, second sending module 21 is used for sending the subnet server that the network element data query requests is given a plurality of subnet servers, and at least one subnet in a plurality of subnets of this subnet server and network is corresponding; Second receiver module 22 is used to receive the History Performance Data that above-mentioned subnet server returns, and this History Performance Data is received from each network element device at least one subnet of correspondence by this subnet server.
Particularly, in the present embodiment, the concrete course of work that all modules are related can repeat no more at this with reference to the related content of the related related embodiment exposure of the method for uploading of said network element History Performance Data.
The NM server of present embodiment; Through whole network is divided into different subnets; And between network element device and NM server, be provided with and different each self-corresponding a plurality of subnet servers of subnet; Each subnet server is responsible for receiving the History Performance Data of the network element device transmission in the corresponding subnet and is stored; Be uploaded to NM server again; Thereby make former network element gateway can be distributed to each sub-net server, even if under the bigger situation of History Performance Data amount numerous at network element device, that upload, also can avoid network congestion, data-bag lost, network element to take off the appearance of tubulose condition effectively to the forwarding pressure of the History Performance Data of all network element devices.Further, each subnet server has also slowed down the pressure that NM server is stored and managed mass data to a certain extent to the temporary transient storage of the History Performance Data uploaded.
Further; On the basis of above-mentioned embodiment; The NM server of present embodiment can also comprise the 3rd sending module 23; Be used for IP address, send to each corresponding network element device of this subnet server, give this subnet server so that each corresponding network element device is uploaded History Performance Data according to the IP address that receives with the subnet server.
Further; On the basis of above-mentioned embodiment; The NM server of present embodiment can also comprise the 4th sending module 24; Be used for to the corresponding different sub-network of subnet server, the different data upload that carries the different very first time values and identical second time value is instructed, send to each interior network element device of its corresponding different sub-network.Wherein, Very first time value is represented the initial uplink time of History Performance Data; Second time value is represented uploading at interval of History Performance Data, and the data upload instruction is used to indicate each network element device in the different sub-network, uploads History Performance Data at interval with different uplink times and regular time.
Particularly, the related concrete course of work in the foregoing description scheme of present embodiment, the related content that can disclose with reference to the related related embodiment of the method for uploading of said network element History Performance Data equally repeats no more at this.
Fig. 5 is the structural representation of the uploading system embodiment of network element historical performance data of the present invention; Shown in 5, the uploading system of present embodiment network element historical performance data comprises: NM server 1, a plurality of subnet servers 2 that are connected with NM server 1 and a plurality of network element devices 3 that are connected with a plurality of subnet servers 2 respectively.Wherein arbitrary subnet server 2 can be corresponding with at least one subnet in a plurality of subnets of the network of native system.
Particularly, in the present embodiment, the concrete course of work that all modules are related can repeat no more at this with reference to the related content of the related related embodiment exposure of method for uploading, subnet server and the NM server of said network element History Performance Data.
The uploading system of the network element historical performance data of present embodiment; Through whole network is being divided into different subnets; And a plurality of subnet servers corresponding with each subnet are set between network element device and NM server; Each subnet server is responsible for receiving the History Performance Data of the network element device transmission in the corresponding subnet and is stored; Be uploaded to NM server again; Thereby make former network element gateway can be distributed to each sub-net server, even if under the bigger situation of History Performance Data amount numerous at network element device, that upload, also can avoid network congestion, data-bag lost, network element to take off the appearance of tubulose condition effectively to the forwarding pressure of the History Performance Data of all network element devices.Further, each subnet server has also slowed down the pressure that NM server is stored and managed mass data to a certain extent to the temporary transient storage of the History Performance Data uploaded.
What should explain at last is: above embodiment is only in order to explaining technical scheme of the present invention, but not to its restriction; Although with reference to previous embodiment the present invention has been carried out detailed explanation, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these are revised or replacement, do not make the spirit and the scope of the essence disengaging various embodiments of the present invention technical scheme of relevant art scheme.