CN104581735A - Channel selection method and device - Google Patents
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- CN104581735A CN104581735A CN201310507847.4A CN201310507847A CN104581735A CN 104581735 A CN104581735 A CN 104581735A CN 201310507847 A CN201310507847 A CN 201310507847A CN 104581735 A CN104581735 A CN 104581735A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
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Abstract
The invention provides a channel selection method and device and belongs to the field of communication. The channel selection method comprises the following steps: step a: obtaining an access point (AP) address list to be subjected to channel configuration in a cell and setting all APs in the AP address list to be in a quiescent state; step b: selecting one AP in the quiescent state from the AP address list and ending the quiescent state of the AP; step c: performing channel scanning on the AP and obtaining a combined field strength value of each channel corresponding to the AP; step d: selecting the selectable channel with the minimum combined field strength value as a working channel of the AP; step e: judging whether the APs in the quiescent state still exist in the AP address list or not, if so, turning to the step b, and otherwise, ending the channel selection process. By adopting the technical scheme provided by the invention, all the APs in a centralized networking region can select the appropriate working channels.
Description
Technical field
The present invention relates to the communications field, refer to a kind of channel selecting method and device especially.
Background technology
WLAN(Wireless Local Area Networks, WLAN) technology completes 11Mbps from 802.11b, to the 54Mbps of 802.11a and 802.11g, arrive the leap of the physical layer rate of the highest 450Mbps of 802.11N again, and with AMPDU(Aggregated MAC Protocol DataUnit, polymerization mac-layer protocol data cell), AMSDU(Aggregated MAC Service DataUnit, polymerization MAC layer Service Data Unit), SGI(Short Guard Interval, short protection interval) this kind of ancillary technique, make WLAN wireless traffic speed more and more faster, become the expansion of cable network gradually with supplementary.
Along with further strong for high-speed wireless access demand of user, and notebook computer, the support of mobile phone to high speed WLAN are more widespread, WLAN technology obtains applying more and more widely, no longer be confined to this kind of privately owned occasion of family wireless online, on airport, library, exhibition room, coffee shop, the public domain such as convention hall, the equal WLAN channel that can search also can access easily, realizes surfing the Net fast.
In WLAN wireless application, two frequency ranges are had to use, 2.4G frequency range and 5G frequency range.Because these two frequency ranges are ISM(industrial/scientific/medical, industrial scientific medical) frequency range is without the need to licensing during use, therefore very high in the wireless device density of these two band operation, mutual interference is very large, directly affects the effect of wireless traffic.For China, 2.4G frequency range is divided into 1 ~ 13 channel, adjacent channel centre frequency be spaced apart 5MHz; Existing 149,153,157,161,165 these channels of 5G frequency range, adjacent channel centre frequency be spaced apart 20MHz.
The relatively morning that WLAN terminal equipment due to 2.4G frequency range occurs, occupation rate of market is high, and the free space attenuation of 2.4G frequency range is less, relative 5G frequency range, it is more general, more at the wlan device of 2.4G band operation, also comparatively crowded that 2.4G frequency range uses, air interference is comparatively strong, and wireless traffic is experienced and occurred that the probability of fluctuation is very large.
Below for 2.4G frequency range, the problem of WLAN channel placement is described.
Although 2.4G frequency range has 1 ~ 13 totally 13 channels, because the interval between channel center frequency only has 5MHz, therefore real non-overlapped channel is little, general actual use in can according to 1,6,11 layouts, individual cases can use 3,8,13 channels.Although 2.4G frequency range also supports 40MHz bandwidth mode, consider disturbing factor, in practical application, 2.4G frequency range is general only can adopt 20MHz bandwidth.
At AP(Access Point, access point) concentrate network environment under, in order to reduce same frequency under WLAN actual scene and adjacent frequency interference as far as possible, channel placement must be carried out to all AP in environment.During layout, not only to consider the interference of horizontal direction, also will consider the interference of vertical direction, and 2.4G frequency range can non-overlapped channel number only have 3, therefore channel placement's work often takes time and effort, and effect is not remarkable.For traditional artificial channel placement, before optimizing channel, first to investigate: obtain the position of AP, building, a place house type sketch, MAC(Medium/Media Access Control, physical address), the information such as existing channel and neighbor AP channel, draw sketch according to finding more afterwards, mark AP information, carefully each AP of consideration channel this how to arrange, after having confirmed channel, more one by one channel is solidified to each AP.The optimum channel that AP should select, the antenna type be often connected with AP position, AP and the factor such as gain, AP field intensity closely related.Want these factors comprehensive, for each AP selects a suitable working channel, difficulty is larger.Under some high density layouts scene, hundreds of platform AP is often had in a building, a community with 10 solitary buildings, often just there are several thousand AP, as independently determined channel to each AP in artificial mode, workload can be very large, and the increase and decrease of follow-up AP all may have an impact to channel placement, often needs channel again layout when increasing and decreasing more.
Based on above-mentioned consideration, allow WLAN concentrate each AP in network environment from the most suitable working channel of main separation, very have realistic meaning.The workload of manually carrying out channel placement can be saved like this, reduce the difficulty of channel placement, without the need to considering the factors such as AP position, antenna type.When AP increases and decreases, only need re-start an automatic channel and select, without the need to the channel distribution situation of other AP around the AP of consideration increase and decrease, allow AP self go to analyze WLAN environmental aspect, and independently determine working channel, selection result can be made more accurate.
At present, the AP of a lot of producer generally supports that automatic channel is selected, but its select and handoff procedure parallel often, all AP namely in environment run certain selection algorithm simultaneously, scanning interference channel around, and determine to disturb minimum channel as oneself follow-up working channel.The shortcoming of this parallel selection scheme is: the while of multiple AP during executing arithmetic, can carry out channel switching simultaneously and scan, before the channel of all AP is determined, WLAN environment also changes in the moment.In a unstable wireless environment, select an optimum channel difficulty determined very large, and algorithm is difficult to convergence, sometimes even can be absorbed in loop computation.That is, AP is in the process that scan channel calculates and channel finally switches, and the parallel scan along with other AP of surrounding operates, and the change of WLAN environment must cause irrational Channel assignment.Parallel channel selection profile, can cause and judge it is best channel at some time points, at the time point of subsequently, becomes and is no longer applicable to this AP.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of channel selecting method and device, can ensure that all AP in concentrated networking region all can choose suitable working channel.
For solving the problems of the technologies described above, embodiments of the invention provide technical scheme as follows:
On the one hand, a kind of channel selecting method is provided, comprises:
Step a: obtain the access point AP address list treating channel configuration in community, and each AP in described AP address list is all set to silent status;
Step b: selection one is in the AP of silent status from described AP address list, and closes the silent status of described AP;
Step c: carry out scan channel to described AP, obtains the combined field intensity values of each channel corresponding to described AP;
Steps d: the alternatives selecting combined field intensity values minimum is as the working channel of described AP;
Step e: judge whether also there is the AP being in silent status in described AP address list, if so, turn to step b; If not, Channel assignment flow process is terminated.
Further, also comprise before described step a:
Set up in community the AP address list treating channel configuration, and in described AP address list, store the corresponding relation between the combined field intensity values treating the IP address of the AP of channel configuration, current operating channel, current operating channel.
Further, also comprise after described steps d:
Described AP is migrated to the minimum alternatives of described combined field intensity values.
Further, described step c comprises:
Step c1: described AP is switched to the channel in scanning channel list;
Step c2: by active scan or drive sweep mode, measure the field intensity value of described channel;
Step c3: judge the channel that whether there is also not measured field intensity value in described scanning channel list, if so, turn to step c1; If not, step c4 is turned to;
Step c4: for each channel in described scanning channel list, in conjunction with the field intensity value of this channel and adjacent channel, calculates the combined field intensity values of each channel.
Further, described step c4 comprises:
Obtain the field intensity value of all AP on this channel and adjacent channel;
Decay according to channel distance and the field intensity value of preset attenuation to AP all on adjacent channel, the field intensity value after overdamping is added with the field intensity value of AP all on this channel the combined field intensity values obtaining this channel.
Further, described step c4 comprises:
Obtain the field intensity value of all AP on this channel;
The field intensity value of AP all on this channel is added the first field intensity value obtaining this channel;
Obtain the normalization neighbor AP number of this channel;
Described normalization neighbor AP number is multiplied with described first field intensity value and obtains the combined field intensity values of this channel.
The embodiment of the present invention additionally provides a kind of channel selector, comprising:
Access point AP mourns in silence module, for obtaining in community the AP address list treating channel configuration, and each AP in described AP address list is all set to silent status;
AP selects module, is in the AP of silent status, and closes the silent status of described AP for selection one from described AP address list;
Scan channel module, for carrying out scan channel to described AP;
Combination received signal strength indicator RSSI detection module, for obtaining the combined field intensity values of each channel corresponding to described AP;
Channel determination module, for the alternatives of the selecting combined field intensity values minimum working channel as described AP;
Described AP selects module also for judging whether also there is the AP being in silent status in described AP address list, if so, then continues selection one from described AP address list and is in the AP of silent status.
Further, described device also comprises:
AP address list sets up module, for setting up in community the AP address list treating channel configuration, and in described AP address list, stores the corresponding relation between the combined field intensity values treating the IP address of the AP of channel configuration, current operating channel, current operating channel.
Further, described device also comprises:
Channel migration module, for select combined field intensity values minimum at described channel determination module the working channel of alternatives as described AP after, described AP is migrated to the minimum alternatives of described combined field intensity values.
Further, described combination field intensity detection module comprises:
Switch unit, for switching to the channel in scanning channel list by described AP;
Measuring unit, for by active scan or drive sweep mode, measures the field intensity value of described channel;
Judging unit, for judging the channel that whether there is also not measured field intensity value in described scanning channel list, if so, is then switched to the channel of the not measured field intensity value in alternatives list by described AP by described switch unit;
Computing unit, during for judging the channel that there is not also not measured field intensity value in described alternatives list at judging unit, for each channel in described scanning channel list, in conjunction with the field intensity value of this channel and adjacent channel, calculate the combined field intensity values of each channel.
Further, described computing unit is specifically for obtaining the field intensity value of all AP on this channel and adjacent channel, decay according to channel distance and the field intensity value of preset attenuation to AP all on adjacent channel, the field intensity value after overdamping is added with the field intensity value of AP all on this channel the combined field intensity values obtaining this channel.
Further, described computing unit is specifically for obtaining the field intensity value of all AP on this channel, the field intensity value of AP all on this channel is added the first field intensity value obtaining this channel, obtain the normalization neighbor AP number of this channel, described normalization neighbor AP number being multiplied with described first field intensity value obtains the combined field intensity values of this channel.
Embodiments of the invention have following beneficial effect:
In such scheme, introduce AP silent status, avoid the mutual interference in traditional parallel channel selection course, to complete in community each AP one by one to the accurate selection of optimum channel, avoid multiple AP simultaneously selective channel time uncertainty, effectively can reduce air interference, ensure that AP correctly and rapidly can lock optimum channel.In addition, to combine field intensity for foundation selection optimum channel, the maximum possible disturbed condition of WLAN environment residing for AP can comparatively accurately be obtained, for the selection of optimum channel provides foundation.By technical scheme of the present invention, can ensure that all AP in concentrated networking region all can choose suitable working channel.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the channel selecting method of the embodiment of the present invention;
Fig. 2 is the structured flowchart of the channel selector of the embodiment of the present invention;
Fig. 3 is the workflow schematic diagram of the combination RSSI detection module of the embodiment of the present invention;
Fig. 4 is another workflow schematic diagram of the combination RSSI detection module of the embodiment of the present invention;
Fig. 5 is another schematic flow sheet of the channel selecting method of the embodiment of the present invention;
Fig. 6 is the example of the combination RSSI of the embodiment of the present invention.
Embodiment
For embodiments of the invention will be solved technical problem, technical scheme and advantage clearly, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
Embodiments of the invention provide a kind of channel selecting method and device, can ensure that all AP in concentrated networking region all can choose suitable working channel.
Fig. 1 is the schematic flow sheet of the channel selecting method of the embodiment of the present invention, and as shown in Figure 1, the present embodiment comprises:
Step a: obtain the AP address list treating channel configuration in community, and each AP in described AP address list is all set to silent status;
Step b: selection one is in the AP of silent status from described AP address list, and closes the silent status of described AP;
Step c: carry out scan channel to described AP, obtains the combined field intensity values of each channel corresponding to described AP, and particularly, combined field intensity values can be combination RSSI(received signal strength indicator) value;
Steps d: the alternatives selecting combined field intensity values minimum is as the working channel of described AP;
Step e: judge whether also there is the AP being in silent status in described AP address list, if so, turn to step b; If not, Channel assignment flow process is terminated.
Channel selecting method of the present invention, introduce AP silent status, avoid the mutual interference in traditional parallel channel selection course, to complete in community each AP one by one to the accurate selection of optimum channel, avoid multiple AP simultaneously selective channel time uncertainty, effectively can reduce air interference, ensure that AP correctly and rapidly can lock optimum channel.In addition, to combine field intensity for foundation selection optimum channel, the maximum possible disturbed condition of WLAN environment residing for AP can comparatively accurately be obtained, for the selection of optimum channel provides foundation.By technical scheme of the present invention, can ensure that all AP in concentrated networking region all can choose suitable working channel.
Further, also comprise before described step a:
Set up in community the AP address list treating channel configuration, and in described AP address list, store the corresponding relation between the combined field intensity values treating the IP address of the AP of channel configuration, current operating channel, current operating channel.
Further, also comprise after described steps d:
Described AP is migrated to the minimum alternatives of described combined field intensity values.
Further, described step c comprises:
Step c1: described AP is switched to the channel in scanning channel list;
Step c2: by active scan or drive sweep mode, measure the field intensity value of described channel;
Step c3: judge the channel that whether there is also not measured field intensity value in described scanning channel list, if so, turn to step c1; If not, step c4 is turned to;
Step c4: for each channel in described scanning channel list, in conjunction with the field intensity value of this channel and adjacent channel, calculates the combined field intensity values of each channel.
Further, described step c4 comprises:
Obtain the field intensity value of all AP on this channel and adjacent channel;
Decay according to channel distance and the field intensity value of preset attenuation to AP all on adjacent channel, the field intensity value after overdamping is added with the field intensity value of AP all on this channel the combined field intensity values obtaining this channel.
Further, described step c4 comprises:
Obtain the field intensity value of all AP on this channel;
The field intensity value of AP all on this channel is added the first field intensity value obtaining this channel;
Obtain the normalization neighbor AP number of this channel;
Described normalization neighbor AP number is multiplied with described first field intensity value and obtains the combined field intensity values of this channel.
The embodiment of the present invention additionally provides a kind of channel selector, and as shown in Figure 2, the present embodiment comprises:
AP mourns in silence module 102, for obtaining in community the AP address list treating channel configuration, and each AP in described AP address list is all set to silent status;
AP selects module 101, is in the AP of silent status, and closes the silent status of described AP for selection one from described AP address list;
Scan channel module 105, for carrying out scan channel to described AP;
Combination field intensity detection module, for obtaining the combined field intensity values of each channel corresponding to described AP, particularly, combination field intensity detection module can be combination RSSI detection module 109;
Channel determination module 106, for the alternatives of the selecting combined field intensity values minimum working channel as described AP;
Described AP selects module also for judging whether also there is the AP being in silent status in described AP address list, if so, then continues selection one from described AP address list and is in the AP of silent status.
Channel selector of the present invention, introduce AP silent status, avoid the mutual interference in traditional parallel channel selection course, to complete in community each AP one by one to the accurate selection of optimum channel, avoid multiple AP simultaneously selective channel time uncertainty, effectively can reduce air interference, ensure that AP correctly and rapidly can lock optimum channel.In addition, to combine field intensity for foundation selection optimum channel, the maximum possible disturbed condition of WLAN environment residing for AP can comparatively accurately be obtained, for the selection of optimum channel provides foundation.By technical scheme of the present invention, can ensure that all AP in concentrated networking region all can choose suitable working channel.
Further, described device also comprises:
AP address list sets up module, for setting up in community the AP address list 104 treating channel configuration, and in described AP address list, store the corresponding relation between the combined field intensity values treating the IP address of the AP of channel configuration, current operating channel, current operating channel.
Further, described device also comprises:
Channel migration module 107, for select combined field intensity values minimum at described channel determination module the working channel of alternatives as described AP after, described AP is migrated to the minimum alternatives of described combined field intensity values.
Further, described combination field intensity detection module comprises:
Switch unit, for switching to the channel in scanning channel list by described AP;
Measuring unit, for by active scan or drive sweep mode, measures the field intensity value of described channel;
Judging unit, for judging the channel that whether there is also not measured field intensity value in described scanning channel list, if so, is then switched to the channel of the not measured field intensity value in alternatives list by described AP by described switch unit;
Computing unit, during for judging the channel that there is not also not measured field intensity value in described alternatives list at judging unit, for each channel in described scanning channel list, in conjunction with the field intensity value of this channel and adjacent channel, calculate the combined field intensity values of each channel.
Further, described computing unit is specifically for obtaining the field intensity value of all AP on this channel and adjacent channel, decay according to channel distance and the field intensity value of preset attenuation to AP all on adjacent channel, the field intensity value after overdamping is added with the field intensity value of AP all on this channel the combined field intensity values obtaining this channel.
Further, described computing unit is specifically for obtaining the field intensity value of all AP on this channel, the field intensity value of AP all on this channel is added the first field intensity value obtaining this channel, obtain the normalization neighbor AP number of this channel, described normalization neighbor AP number being multiplied with described first field intensity value obtains the combined field intensity values of this channel.
Below in conjunction with accompanying drawing and specific embodiment, channel selecting method of the present invention is described in detail:
The object of the present invention is to provide a kind of convenient and practical, the channel selecting method of the WLAN serial mode that accuracy is high, ensure to concentrate all AP in networking region all can choose suitable working channel.The present invention includes: system level operation, AP level operate.
Wherein, system level operation is responsible for selecting each AP successively according to AP address list, and dispatches AP level operation (as silent status open and close, scan channel start).
The operation of AP level comprises silent status and opens and closes, and scan channel, combination field intensity detect, channel judges and channel migration.
As shown in Figure 2, in channel selector of the present invention, what executive system level operated has following several module:
AP selects module 101: according to cut-and-dried AP address list 104, select AP one by one.After certain AP operational processes completes, then select next AP and indicate it to operate.Wherein, AP address list 104 provides the address list of the AP needed for system level operation, need provide in advance.
AP mourns in silence module 102: instruction AP starts silent status and closes silent status.At the beginning of channel selection operations starts, need to indicate all AP to be all in silent status, now wlan system inside answer no user to connect, send without any AP management, control and data message, WLAN environment is in the quiet state of one " silent ".Then, start AP one by one, before the Channel assignment starting single AP, first close its silent status, make AP enter normal wireless receiving and dispatching bag-like state.
AP automatic channel is selected to start module 103, and after selecting module 101 to select one to be in the AP of silent status from described AP address list for AP, the automatic channel starting AP is selected.
What perform the operation of AP level includes following module:
Mourn in silence and open and close module 108, for opening or close the silent status of AP;
Scan channel module 105: after the AP automatic channel selection starting command of receiving system level operation, first proceed to this operation.According to scanning channel list 110, each channel is scanned one by one, calculates and switch.Calculate and completed by combination RSSI detection module 109.
Channel determination module 106: according to the scanning result of alternatives list 111 and scan channel module 105, determine the working channel of the current the best of AP.
Channel migration module 107: according to the result of channel determination module 106, carries out actual channel migration to AP.
Combination RSSI detection module 109: coordinate scan channel module 105, combined field intensity values is gone out, in units of dBm to each channel calculation in scanning channel list 110.
Wherein, scanning channel list 110 provides all channel numbers to be scanned, and alternatives list 111 provides to be determined and all alternatives number of migration.
As shown in Figure 3, combined field intensity values can be obtained by following operation:
MAC(medium access control, medium access control)/RSSI information acquiring operation 201, receive the output from scan channel module 105, obtain the MAC/RSSI information of all AP on present channel and adjacent channel.
MAC/RSSI information chained list aging update operation 202, MAC/RSSI information is put into chained list, then upgrades for already present information, and start timer and carry out aging judgement, aging MAC/RSSI information will be deleted from chained list.After chain table handling terminates, enter same adjacent frequency RSSI pre-operation 203 and process.
With adjacent frequency RSSI pre-operation 203, from chained list, take out node, for the field intensity value of adjacent channel, decay according to channel distance (i.e. the distance of adjacent channel and this channel) and preset attenuation; For the field intensity value of present channel, do not do attenuation operations.
DBm to pw conversion and accumulation operations 204, according to the operating result of same adjacent frequency RSSI pre-operation 203, be pw(micromicrowatt by field intensity value from being not easy to directly cumulative dBm unit conversion) unit, and carry out accumulation operations on this basis, obtain the combined field intensity values in units of pw.
Pw accumulated value is to dBm conversion operations 205, and by the combined field intensity values of the pw unit that dBm to pw conversion and accumulation operations 204 add up, reverse conversion becomes the combined field intensity values in units of dBm.
Present channel combined field intensity values record operation 206, carries out record, as the judgment basis of subsequent channel determination module 106 by the combined field intensity values that present channel calculates.
Further, as shown in Figure 4, combined field intensity values can also be obtained by following operation:
MAC/RSSI information acquiring operation 301, receives the output from scan channel module 105, obtains the MAC/RSSI information of all AP of present channel.
MAC/RSSI information chained list aging update operation 302, MAC/RSSI information is put into chained list, then upgrades for already present information, and start timer and carry out aging judgement, aging MAC/RSSI information will be deleted from chained list.
Field intensity value, according to the field intensity value of all AP of present channel, is pw unit from being not easy to directly cumulative dBm unit conversion by dBm to pw conversion and accumulation operations 303, and carry out accumulation operations on this basis, obtain each field intensity value and, be called CRSSI, unit is pw.
Each RSSI interval neighbor AP number distributed acquisition operation 304, obtains each field intensity value of present channel interval, as the neighbor AP number of [0 ,-45] dBm, [-46 ,-65] dBm, [-66 ,-75] dBm, [-75 ,-85] dBm scope.These interval distribution representatives are near, in, far away, far neighbor AP, the neighbor AP in these intervals to the interference of this AP by strong to weak.
Normalization neighbor AP number NNUM calculating operation 305, according to the interval distribution results of each RSSI interval neighbor AP number distributed acquisition operation 304, and consider the neighbor AP in these intervals to the interference of AP on this channel by strong extremely weak, the neighbor AP number in each interval is multiplied by different weights, to obtain normalization neighbor AP number NNUM.Such as [0,-45] dBm, [-46,-65] dBm, [-66,-75] dBm, [-75,-85] the neighbor AP number of dBm is respectively N1, N2, N3, N4, then can consider one group of weights 100,70,25,5, normalization neighbor AP number is: NNUM=(N1*100+N2*70+N3*25+N4*5)/100.Such as, in a specific embodiment, N1, N2, N3, N4 are respectively 2,11,10,56, then the normalization neighbor AP number NNUM calculated is 15.
Multiplication operations 306, by dBm to pw conversion and accumulation operations 303, normalization neighbor AP number NNUM calculating operation 305 result carry out multiply operation.
The result of multiplication operations 306, to dBm conversion operations 307, is converted in units of dBm by pw accumulated value, and this i.e. revised combined field intensity values, and be called MRSSI, unit is dBm.
Present channel combined field intensity values record operation 308, carries out record, as the judgment basis of subsequent channel determination module 106 by the combined field intensity values that present channel calculates.
Aforesaid operations 301-308 for the sake of simplicity, does not consider the impact of adjacent channel.When the affecting of adjacent channel need be considered, the combined field intensity values (unit is dBm) of adjacent channel still can be obtained by the computational methods similar with aforesaid operations 301-308, according to channel distance (i.e. the distance of adjacent channel and this channel) and after the combined field intensity values of preset attenuation to adjacent channel decay, then the combined field intensity values after decaying is merged in the combined field intensity values of present channel goes.When the combined field intensity values of adjacent channel and the combined field intensity values of present channel merge, still need to be first that pw is added by unit conversion, then be dBm by the unit conversion of addition result.
As shown in Figure 5, the basic procedure of channel selecting method of the present invention is as follows:
Step 1: obtain the AP address list treating channel configuration in community.Ordinary circumstance, AP address list can be enumerated by the IP address of AP, and follow-up channel selection operations all based on this list, can process AP in turn.
Step 2: by information such as the combined field intensity values of AP address and current working channel, this channel, be organized into form, so that the situation after optimizing with step 13 contrasts.
Step 3: the AP address list arranging out according to step 1, is all set to silent status by each AP.Through this operation, all AP in community do not send out wireless data packet and supervisory packet, therefore can not produce interference to AP Channel assignment subsequently.
Step 4: select each AP successively.This is namely from AP address list, starts to select an AP from the beginning to the end according to putting in order of AP.
Step 5: the AP chosen for step 4, closes the silent status of AP.Now, this AP can normally send Beacon(beacon) frame and Probe Response(probe response) frame.
Step 6: channel scanning operations is carried out to the AP chosen.AP can select a channel from scanning channel list, by active scan or drive sweep mode, obtains the information such as the MAC/RSSI of this channel, particularly, comprises the following steps 7-8.
Step 7:AP selects a channel from scanning channel list, and switches to this channel packet receiving and give out a contract for a project.
On the channel that step 8:AP selects in step 7, by active scan or drive sweep mode, obtain the information such as the MAC/RSSI of this channel.
Step 9: judge whether the channel in scanning channel list has switched complete all, and whether the channel namely in scanning channel list is acquired the information such as MAC/RSSI all, if also have channel not switch, then goes to step 6 process, otherwise performs step 10.
Step 10: based on each channel respectively in scanning channel list, in conjunction with the RSSI information of this channel and adjacent channel, calculates the combined field intensity values of each channel.The computational methods of combined field intensity values, the explanation can be correlated with see Fig. 3 and Fig. 4, Fig. 6 is the example of the combination RSSI of the embodiment of the present invention.
Step 11: from alternatives list, according to the combined field intensity values of each channel that step 10 calculates, selects the channel that a combined field intensity values is minimum.It should be noted that alternatives list is a subset of scanning channel list.The scanning channel list of such as 2.4G comprises 1,6,11,3,8,13 channels, and field layout only allows 1,6,11 channels, and therefore alternatives list can only be 1,6,11.And 3,8,13 only input as data during same adjacent frequency RSSI conversion.
Step 12:AP migrates to the channel selected by step 11, and shows this channel information.Now, AP normally will send Beacon and Probe Resp on this channel, and allow user to access, and can normally work.Its signal strength sent is using same adjacent frequency interference source input when carrying out Channel assignment as other AP.
Step 13: judge whether the AP in AP address list all travels through complete, if still have AP untreated, then skips to step 4, continues to select next AP to run channel selection algorithm, if without residue AP, then go to step 14.‘
Step 14: the channel selection algorithm of all AP all runs complete, by information such as the IP address of AP and the new working channel of selection, the combined field intensity values of this channel, is organized into form.
Step 15: channel selection algorithm terminates, all AP are all in normal operating conditions.
Namely can be in community through above-mentioned steps 1-15 and treat that the AP of channel configuration selects suitable working channel, if the AP in community there occurs change, such as increase AP newly, or delete AP, then above-mentioned steps 1-15 can be re-executed, again for the AP in community selects suitable working channel.
The building of 100 AP is installed for one, first allows all AP mourn in silence, then start AP one by one, allow each AP freely scan and the channel selecting the interference of current location minimum.Suppose to allow the channel selected to only have 3: 1,6,11.Adjacent AP in this building can be divided into a lot of microcellulors by its sphere of influence, and at inside micro cells, channel must distinguish, and the spacing of microcellulor is relatively far away, and affect very little, channel completely can be multiplexing.When running channel selection algorithm, AP needs to choose an optimum channel at inside micro cells.Can simply be interpreted as: due to geographic isolation, by 1,6,11 channel bank, 3 teams in each microcellulor, have N number of microcellulor in Dan Yige building, therefore can arrange 3*N team, 3*N approximates 100.The division of this microcellulor, does not need artificial investigation, does not have boundary clear and definite especially yet.
Compared with prior art, the present invention is the channel selecting method of serial, within the suitable time, completes each AP in community one by one and, to the selection of optimum channel, avoids channel when simultaneously selecting uncertain, can effectively reduce mutual air interference.Wherein, the calculating of combined field intensity values, comparatively accurately can obtain the maximum possible disturbed condition of WLAN environment residing for AP, for the selection of optimum channel provides foundation.
The operation that this serial channel is selected, eliminates Field Research in early stage, the operation that manual analysis is optimized.Channel selecting method of the present invention both can carry out for a community, also can carry out for certain building, and the AP that can also only newly install for carries out, and algorithm is simple.The channel number of scanning, the sweep time of each channel all can be arranged as required, improve the flexibility of system.Channel selecting method of the present invention does not limit by scene, all can use in low-density, high density AP scene, many floors covering scene, room point covering scene.When carrying out Channel assignment, each AP, successively by the weak impact of all AP of sensing neighbor honeycomb and the strong impact of other AP of this honeycomb, comprehensively obtains a combination decision content, therefrom chooses best channel.This mode is without the geographical position of region-of-interest AP quantity, each AP and antenna, floor distribution and the faint gap of field intensity, simple.Be serial operation because each AP carries out Channel assignment, have selected certain channel and namely keep fixing, avoid the mutual interference of lasting change when parallel channel is selected, the substitute is static measurable mutual interference, therefore the result of Channel assignment is more accurate.
The present invention can reduce interference in system, even if there is WLAN interference signal (system the is outer) interference of multiple operator at scene, technical scheme of the present invention is still effective.Channel assignment not only for 2.4G is effective, and in 5G frequency range, this technical scheme is still feasible.This technical scheme is mainly used in the WLAN network planning network optimization stage, namely keeps fixing, do not need periodic duty Channel assignment after automatically choosing channel.
Many functional parts described in this specification are all called as module, specifically to emphasize the independence of its implementation.
In the embodiment of the present invention, module can use software simulating, to be performed by various types of processor.For example, the executable code module of a mark can comprise one or more physics or the logical block of computer instruction, and for example, it can be built as object, process or function.However, the executable code of institute's identification module is does not have to be physically positioned at together, but can comprise and be stored in different different instruction physically, when these command logics combine, and its composition module and realize the regulation object of this module.
In fact, executable code module can be individual instructions or many bar instructions, and even can be distributed on multiple different code segment, is distributed in the middle of distinct program, and crosses over the distribution of multiple memory devices.Similarly, operating data can be identified in module, and can realize according to any suitable form and be organized in the data structure of any suitable type.Described operating data can be collected as individual data collection, or can be distributed on diverse location and (be included in different storage device), and can only be present on system or network as electronic signal at least in part.
When module can utilize software simulating, consider the level of existing hardware technique, so can with the module of software simulating, when not considering cost, those skilled in the art can build corresponding hardware circuit and realize corresponding function, and described hardware circuit comprises existing semiconductor or other discrete element of conventional ultra-large integrated (VLSI) circuit or gate array and such as logic chip, transistor and so on.Module can also use programmable hardware device, the realizations such as such as field programmable gate array, programmable logic array, programmable logic device.
In each embodiment of the method for the present invention; the sequence number of described each step can not be used for the sequencing limiting each step; for those of ordinary skill in the art, under the prerequisite not paying creative work, the priority of each step is changed also within protection scope of the present invention.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (12)
1. a channel selecting method, is characterized in that, comprising:
Step a: obtain the access point AP address list treating channel configuration in community, and each AP in described AP address list is all set to silent status;
Step b: selection one is in the AP of silent status from described AP address list, and closes the silent status of described AP;
Step c: carry out scan channel to described AP, obtains the combined field intensity values of each channel corresponding to described AP;
Steps d: the alternatives selecting combined field intensity values minimum is as the working channel of described AP;
Step e: judge whether also there is the AP being in silent status in described AP address list, if so, turn to step b; If not, Channel assignment flow process is terminated.
2. channel selecting method according to claim 1, is characterized in that, also comprises before described step a:
Set up in community the AP address list treating channel configuration, and in described AP address list, store the corresponding relation between the combined field intensity values treating the IP address of the AP of channel configuration, current operating channel, current operating channel.
3. channel selecting method according to claim 2, is characterized in that, also comprises after described steps d:
Described AP is migrated to the minimum alternatives of described combined field intensity values.
4. channel selecting method according to claim 1, is characterized in that, described step c comprises:
Step c1: described AP is switched to the channel in scanning channel list;
Step c2: by active scan or drive sweep mode, measure the field intensity value of described channel;
Step c3: judge the channel that whether there is also not measured field intensity value in described scanning channel list, if so, turn to step c1; If not, step c4 is turned to;
Step c4: for each channel in described scanning channel list, in conjunction with the field intensity value of this channel and adjacent channel, calculates the combined field intensity values of each channel.
5. channel selecting method according to claim 4, is characterized in that, described step c4 comprises:
Obtain the field intensity value of all AP on this channel and adjacent channel;
Decay according to channel distance and the field intensity value of preset attenuation to AP all on adjacent channel, the field intensity value after overdamping is added with the field intensity value of AP all on this channel the combined field intensity values obtaining this channel.
6. channel selecting method according to claim 4, is characterized in that, described step c4 comprises:
Obtain the field intensity value of all AP on this channel;
The field intensity value of AP all on this channel is added the first field intensity value obtaining this channel;
Obtain the normalization neighbor AP number of this channel;
Described normalization neighbor AP number is multiplied with described first field intensity value and obtains the combined field intensity values of this channel.
7. a channel selector, is characterized in that, comprising:
Access point AP mourns in silence module, for obtaining in community the AP address list treating channel configuration, and each AP in described AP address list is all set to silent status;
AP selects module, is in the AP of silent status, and closes the silent status of described AP for selection one from described AP address list;
Scan channel module, for carrying out scan channel to described AP;
Combination field intensity detection module, for obtaining the combined field intensity values of each channel corresponding to described AP;
Channel determination module, for the alternatives of the selecting combined field intensity values minimum working channel as described AP;
Described AP selects module also for judging whether also there is the AP being in silent status in described AP address list, if so, then continues selection one from described AP address list and is in the AP of silent status.
8. channel selector according to claim 7, is characterized in that, described device also comprises:
AP address list sets up module, for setting up in community the AP address list treating channel configuration, and in described AP address list, stores the corresponding relation between the combined field intensity values treating the IP address of the AP of channel configuration, current operating channel, current operating channel.
9. channel selector according to claim 8, is characterized in that, described device also comprises:
Channel migration module, for select combined field intensity values minimum at described channel determination module the working channel of alternatives as described AP after, described AP is migrated to the minimum alternatives of described combined field intensity values.
10. channel selector according to claim 7, is characterized in that, described combination field intensity detection module comprises:
Switch unit, for switching to the channel in scanning channel list by described AP;
Measuring unit, for by active scan or drive sweep mode, measures the field intensity value of described channel;
Judging unit, for judging the channel that whether there is also not measured field intensity value in described scanning channel list, if so, is then switched to the channel of the not measured field intensity value in alternatives list by described AP by described switch unit;
Computing unit, during for judging the channel that there is not also not measured field intensity value in described alternatives list at judging unit, for each channel in described scanning channel list, in conjunction with the field intensity value of this channel and adjacent channel, calculate the combined field intensity values of each channel.
11. channel selectors according to claim 10, is characterized in that,
Described computing unit is specifically for obtaining the field intensity value of all AP on this channel and adjacent channel, decay according to channel distance and the field intensity value of preset attenuation to AP all on adjacent channel, the field intensity value after overdamping is added with the field intensity value of AP all on this channel the combined field intensity values obtaining this channel.
12. channel selectors according to claim 10, is characterized in that,
Described computing unit is specifically for obtaining the field intensity value of all AP on this channel, the field intensity value of AP all on this channel is added the first field intensity value obtaining this channel, obtain the normalization neighbor AP number of this channel, described normalization neighbor AP number being multiplied with described first field intensity value obtains the combined field intensity values of this channel.
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| CN201310507847.4A CN104581735B (en) | 2013-10-24 | 2013-10-24 | Channel selecting method and device |
| PCT/CN2014/085553 WO2015058587A1 (en) | 2013-10-24 | 2014-08-29 | Channel selection method and device |
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| WO2015058587A1 (en) | 2015-04-30 |
| CN104581735B (en) | 2019-02-01 |
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