CN102378218B - Access point equipment of wireless local area network and channel selection method thereof - Google Patents
Access point equipment of wireless local area network and channel selection method thereof Download PDFInfo
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Abstract
The invention discloses an access point equipment of a wireless local area network and a channel selection method thereof. The access point equipment comprises a first radio frequency unit, a communication module, a second radio frequency unit, a channel detection module and a wireless management module, wherein the communication module is connected with the first radio frequency unit; the second radio frequency unit is used for scanning channel information of each channel in the area of the access point equipment; the channel detection module is connected with the second radio frequency unit; and the wireless management module is respectively connected with the communication module and the channel detection module; and the wireless management module is used for selecting a channel according with communication conditions to transmit data according to detection information and pre-set rules. According to the access point equipment of the wireless local area network, by scanning and detecting each channel in the area of the access point equipment and selecting the channel according with the communication conditions to transmit the data according to the pre-set rules, the defect of transmission packet loss which is caused by competition/conflict of the channel is effectively avoided when the two sets of the access equipment which work on the same channel or the adjacent channels transmit the data, so that the performance of the wireless network is improved.
Description
Technical field
The present invention relates to wireless local area network technology, relate in particular to a kind of device of wireless local area network access point and channel selecting method thereof.
Background technology
At present, terminal (mobile terminal or computer) in WLAN (wireless local area network) is by access point (AP) equipment access network, is important in the interconnection technique of hot spot region and a kind of technology of being used widely take IEEE 802.11 series of canonical as basic wireless local area network technology.
Because IEEE 802.11 is operated in undelegated open network frequency range, it is various that WLAN (wireless local area network) is disposed user type, operator, enterprise, individually can dispose per capita, and multiple access points are in the time disposing, can not hold consultation to each other and jointly optimize and dispose, therefore have the situation of simultaneously having disposed multiple access points in same overlay area, be subject to the interference from these other equipment of frequency range, interference with each other can cause very large impact to network performance.
In order to reduce or to avoid interference, conventionally in the time that single lan is disposed, adopt the method for engineering optimization in the same area, to adopt a kind of channel as far as possible, between adjacent area, adopt non-interfering orthogonal channel (as 1 on 2.4GHz, 6,11 channels).Existing AP channel self-adjusting scheme is mainly chosen clean channel by scanning, and the working channel of AP is set, and avoids the interference between AP, guarantees lan capacity.The precondition of implementing the method is in same region, to have the AP exceeding more than orthogonal channel number to cover.For example, if be operated under 2.4GHz condition, if the AP quantity of current position exceedes 3, in any case arrange so, AP all scans the clean channel less than other.
Along with the deployment of a large amount of hot spot regions of operator, a large amount of uses and the enterprise wireless covering etc. of individual's home network wireless aps, in same region, often there is exceeding the situation that 3 AP cover, be difficult to find again clean channel, therefore in the situation that many deployment users lack negotiation, even if adopt the method for engineering optimization to optimize the deployment of self network, the method for there is no is avoided the interference problem between multiple local area network (LAN)s.And the impact that air interference causes network is mainly the transmission of data, when two AP are operated in identical/adjacent channel, and while all having transfer of data on two AP, due to the competition/conflict of channel, will cause these two AP that transmission packet loss occurs, thereby affect wireless network performance.
Summary of the invention
In order to overcome defect of the prior art, the invention provides a kind of device of wireless local area network access point and channel selecting method thereof, to realize the safety and reliability that effectively strengthens transfer of data, improve wireless network performance.
For achieving the above object, the invention provides a kind of access point apparatus, comprise: the first radio frequency unit and the communication module being connected with described the first radio frequency unit, also comprise: the second radio frequency unit, for scanning the channel information of each channel of described access point apparatus region; Channel Detection module, is connected with described the second radio frequency unit, for the channel information of described the second radio frequency unit scanning is detected, obtains detection information; Described detection information comprises the detected corresponding channel number of channel and website quantity; Radio management module is connected with described communication module and described Channel Detection module respectively, and for according to described detection information and pre-defined rule, the channel of selector hop communication condition carries out transfer of data.
For achieving the above object, the present invention also provides a kind of channel selecting method of access point apparatus, comprising: the channel information of the each channel to described access point apparatus region scans; Channel information to scanning detects, and obtains detection information; Described detection information comprises the detected corresponding channel number of channel and website quantity; According to described detection information and pre-defined rule, the channel of selector hop communication condition carries out transfer of data.
From above technical scheme, the present invention by having increased the second radio frequency unit, detection module and radio management module in access point apparatus, access point apparatus region is carried out to scanning detection and the channel of wireless transmission environment and select judgement, can effectively avoid all having transfer of data on two access point apparatus that are operated in identical or adjacent channel time, due to the competition/conflict of channel, and the defect of the transmission packet loss causing, can strengthen the safety and reliability of transfer of data, thereby improve the performance of wireless network.
Below by specific embodiment, and by reference to the accompanying drawings the present invention is described in further detail.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of embodiment of the present invention access point apparatus;
Fig. 2 is the flow chart of embodiment of the present invention access point apparatus channel selecting method.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 1 is the structural representation of embodiment of the present invention access point apparatus, as shown in Figure 1, the access point apparatus that the embodiment of the present invention provides comprises the first radio frequency unit 11 and communication module 12, wherein, the first radio frequency unit 11 carries out transfer of data work radio frequency used as this access point apparatus, acts on the normal transceiver of realizing communication employing.Communication module 12 is connected with the first radio frequency unit 11, completes transfer of data for the work radio frequency providing based on the first radio frequency unit 11.Interference-free in order to guarantee self to be operated in one in the access point apparatus that the embodiment of the present invention provides, or disturb on smaller data transmission channel and work, in access point apparatus, increase the second radio frequency unit 13 of the channel information of the each channel for scanning access point apparatus region, the Channel Detection module 14 being connected with the second radio frequency unit 13, and the radio management module 15 being connected with communication module 12 and Channel Detection module 14 respectively.Wherein, the second radio frequency unit 13 acts on the detection transceiver of scanning channel information; Detection transceiver is arranged at listening state by Channel Detection module 14, make it monitor the data transmit-receive situation of each channel, Channel Detection module 14 detects and obtains the detection information of detected channel for the channel information that the second radio frequency unit 13 is scanned simultaneously, and this detection information at least comprises the information such as the detected corresponding channel number of channel and website quantity; Radio management module 15 manages communication module 12 and Channel Detection module 14, according to above-mentioned detection information and pre-defined rule, the channel of selector hop communication condition carries out transfer of data, and wherein radio management module 15 arranges the working channel of the first radio frequency unit 11 by communication module 12.
Concrete, access point apparatus is deployed in a new region need to select working channel or carry out working channel switching in original working region in the situation that, access point apparatus carries out the scanning of channel information by each channel in the second region of radio frequency unit 13 to its place wherein, Channel Detection module 14 receives the scanning information of the second radio frequency unit 13 and the information of carrying out detects the needed information of acquisition selective channel, for example, at least comprise detected channel corresponding channel number and website quantity etc. separately.Described channel number can be the channel logo information of this detected channel, and described website schedule of quantities is shown with how many websites and has applied this detected channel as working channel.Obtain after detection information in Channel Detection module 14, carry out channel selection by radio management module 15.Particularly, the monitoring information that radio management module 15 obtains according to Channel Detection module 14 and pre-defined rule, from multiple detected channels, select one and meet the channel of communication condition as the working channel of access point apparatus, and carry out transfer of data by this channel.
Pre-defined rule described in the present embodiment can be to dispose before this access point apparatus or in the course of work, in equipment, set, be not subject to external interference in order to select one, or be subject to a channel of external interference minimum to carry out the channel selective rule of transfer of data, it can adopt software program or database mode to be stored in radio management module.
Access point apparatus provided by the present invention is by the scanning of the channel information to its each channel in region, obtain detection information, and carry out channel selection according to described detection information and pre-defined rule, select the channel that meets communication condition and carry out transfer of data, while effectively having avoided all having transfer of data on two access point apparatus that are operated in identical or adjacent channel, due to the competition/conflict of channel, and the defect of the transmission packet loss causing, strengthen the safety and reliability of transfer of data, thereby improved the performance of wireless network.
The embodiment of the present invention to be operated under 2.4GHz condition as how example completes channel to pre-defined rule and access point apparatus is selected to be described in detail.
Under 2.4GHz frequency condition, channel isolation is more than or equal to the interchannel orthogonal channel each other of predetermined threshold 5, can not cause each other interference, for example channel number is 1,6,11 interchannel orthogonal channel each other, wherein channel isolation is the absolute difference of the channel number of two channels, otherwise channel isolation is less than the interchannel adjacent channel each other of predetermined threshold 5.If the access point apparatus quantity of disposing in the same area is less than orthogonal channel while counting, exist not disturbed channel to select for the access point apparatus newly adding; If the access point apparatus quantity of disposing in the same area is more than or equal to orthogonal channel while counting, there is not disturbed channel, the access point apparatus newly adding can only be selected a channel access network from all the other channels, in this case, can utilize corresponding informance in described detection information as Rule of judgment, from adjacent channel, select the less channel that is disturbed to carry out transfer of data.
Wherein, in described detection information, can also comprise: the quantity of the packet that detected channel transmits in nearest transmission cycle, the size of packet, the message transmission rate that detected channel is corresponding, detected corresponding received signal strength RSS (Received Signal Strength) and/or signal and the interference-to-noise ratio SINR (Signal to Interference plus Noise Ratio) of channel.Wherein, the quantity of the packet that described detected channel transmits in nearest transmission cycle, represent this detected channel transmission data bag in the current last cycle of scanning place transmission cycle number, for judging whether this detected channel has transfer of data; The size of the packet that described detected channel transmits in nearest transmission cycle, the size that represents this detected channel actual transmissions data amount in current the last week of scanning place transmission cycle, the transmission rate corresponding with detected channel is jointly for judging the occupied busy situation of this detected channel; The received signal strength RSS that described detected channel is corresponding and/or signal and interference-to-noise ratio SINR, for the measurement index of the signal strength signal intensity to this detected channel and interference noise intensity, for the annoyance level between quantitative assessment adjacent channel.
Further, described pre-defined rule comprise the corresponding website quantity of preferential selection be zero and website quantity corresponding to its adjacent channel be also zero detected channel, i.e. clean channel.Wherein said adjacent channel is the detected channel that the absolute value of the difference of the channel number of channel number and described detected channel is less than a predetermined threshold, the absolute value of this difference is isolation, and described predetermined threshold is the isolation value that is preset in assurance two interchannels in system and does not cause mutually interference.For example, under 2.4GHz condition, the interchannel adjacent channel each other that channel isolation is less than 5, channel 1 is adjacent channel with channel 4, its isolation is 3; Channel 1 is non-adjacent channel with channel 6, i.e. described orthogonal channel, and its isolation is 5.Described clean channel self is not shared by other working terminals, and not adjacent channel each other of itself and the current shared interchannel of other working terminals scanning, described clean channel is not subject to external interference, more excellent channel as access point apparatus is selected, if there is clean channel in access point apparatus region, by radio management module 15, working channel is switched to this clean channel.
Concrete, for example access point apparatus is deployed in a new region and need to selects in the situation of working channel, according to the pre-defined rule of access point apparatus, first judge in this region and whether exist and do not taken by other websites and interference-free clean channel, if exist, preferentially select this clean channel.
Access point apparatus provided by the present invention judges by the scanning result of the channel information to its each channel in region, in the situation that having clean channel to exist, preferentially working channel is switched to this clean channel, effectively avoid unnecessary interference, guaranteed the data transmission quality of wireless network.
Further, described pre-defined rule is also included in the situation that clean channel cannot be detected, though preferentially select corresponding website quantity non-vanishing without transfer of data and its adjacent channel also without the detected channel of transfer of data, i.e. idle channel.Wherein, the data packet number that the detected channel comprising by described detection information transmits in nearest transmission cycle, judges whether described detected channel and adjacent channel thereof exist transfer of data.Described idle channel self is shared by other working terminals, but does not carry out transfer of data; Its adjacent channel may be in the shared or unappropriated situation by other working terminals, but does not carry out transfer of data.Described idle channel is that the more excellent channel while there is not clean channel in access point apparatus region is selected, if there is idle channel in access point apparatus region, by radio management module 15, working channel is switched to this idle channel.
Concrete, access point apparatus is deployed in a new region need to select working channel or carry out working channel switching in original working region in the situation that, according to the pre-defined rule of access point apparatus, if judge and do not have clean channel in this region, judge and in this region, whether exist self and adjacent channel all without the idle channel of transfer of data, if exist, preferentially select this idle channel.
Access point apparatus provided by the present invention judges by the scanning result of the channel information to its each channel in region, in the situation that not there is not clean channel, preferentially working channel is switched to idle channel, in the wireless transmission environment that may have interference, transmit by the channel of selecting institute's minimum interference, keep as much as possible good data transmission quality.
Further, described pre-defined rule is also included in the situation that idle channel cannot be detected, the preferential busy channel of selecting, the described busy channel described in the present embodiment can comprise self busy channel, the busy channel of neighbours and complete busy channel.Wherein said self busy channel is that corresponding website quantity is non-vanishing and have a transfer of data, but its adjacent channel is without the detected channel of transfer of data, be that described detected channel is shared by other working terminals and have a transfer of data, its adjacent channel may be in the shared or unappropriated situation by other working terminals, but does not carry out transfer of data; The busy channel of described neighbours is without transfer of data, but website quantity corresponding to its adjacent channel is non-vanishing and have a detected channel of transfer of data, be that described detected channel self may be in the shared or unappropriated situation by other working terminals, but do not carry out transfer of data, its adjacent channel is shared by other working terminals and have a transfer of data; Described complete busy channel is for there being transfer of data, and its adjacent channel also has the detected channel of transfer of data, and described detected channel self and adjacent channel thereof are all shared by other working terminals and have a transfer of data.Described busy channel is the channel Selective type while there is not idle channel in access point apparatus region, if there is not idle channel in access point apparatus region, by radio management module 15, working channel is switched to a busy channel.
Concrete, access point apparatus is deployed in a new region need to select working channel or carry out working channel switching in original working region in the situation that, according to the pre-defined rule of access point apparatus, if judge in this region and do not have idle channel, select a busy channel to carry out transfer of data.
Access point apparatus provided by the invention judges by the scanning result of the channel information to its each channel in region, in the situation that not there is not idle channel, working channel is switched to a busy channel, in the wireless transmission environment disturbing in existence, by selecting the less channel that is disturbed to transmit, keep as much as possible good data transmission quality.
Further, in the time only having busy channel to exist in described access point apparatus region, for the busy channel of optimum selecting one carries out transfer of data, the embodiment of the present invention provides the rule of a more excellent channel of choose reasonable from detected busy channel, does not need described busy channel type to judge in the process that described busy channel is selected.Described pre-defined rule also comprises the selective rule of busy channel, selects the busy channel of data transmission period duty ratio T minimum to carry out transfer of data, wherein
in described detection information, also comprise data package size and the transmission rate that described detected channel transmits in nearest transmission cycle, for calculating the corresponding data transmission period duty ratio of current channel T
iand the corresponding data transmission period duty ratio of the each adjacent channel T of described current channel
j, T
iand T
jcomputational methods be data package size/(the transmission rate * transmission cycle) transmitting in nearest transmission cycle.Wherein, the data transmission period duty ratio of described current channel and each adjacent channel thereof, is this current channel and the each adjacent channel occupation proportion of data transmitting time to this transmission cycle in transmission cycle respectively thereof.For example transmit take busy channel number as 6 channel and transmission cycle described as example as 20 seconds, if this channel is in the busy state of neighbours, in the adjacent channel of this channel, there is transfer of data, if the transmission rate of this adjacent channel is 1Mbps, in the transmission cycle of itself and 20 seconds, can transmit at most the data volume of 20Mb, if in a transmission cycle, the data volume of the actual transmission of this channel is 10Mb, and the data transmission period duty ratio of this adjacent channel is 1/2.M
ijfor each adjacent channel of described current channel interference weight to described current channel, be the important computations foundation of data transmission period duty ratio T, m
ij=channel isolation factor of influence A
ij* channel disturbance intensity effect factor B
ij, wherein,
0 < B
ij≤ 1.Described detection information also comprises detected corresponding received signal strength RSS and/or signal and the interference-to-noise ratio SINR of channel, for calculating described channel disturbance intensity effect factor B
ij.Described data transmission period duty ratio T is the weighted sum of current channel and adjacent channel data transmission period duty ratio thereof.If there is the qualified busy channel of data transmission period duty ratio in access point apparatus region, by radio management module 15, working channel switched to this busy channel.
Concrete, access point apparatus is deployed in a new region need to select working channel or carry out working channel switching in original working region in the situation that, according to the pre-defined rule of access point apparatus, if only there is busy channel in this region, need the data transmission period duty ratio according to current channel and adjacent channel thereof, in conjunction with channel isolation factor of influence A
ijwith channel disturbance intensity effect factor B
ij, busy channel of optimum selecting transmits.
Access point apparatus provided by the invention judges by the scanning result of the channel information to its each channel in region, in the situation that only there is busy channel, by working channel being switched to a busy channel of minimum interference, make, the in the situation that of inevitable interference, to guarantee good data transmission quality as far as possible.
Further, because switching, channel must bring certain expense, therefore when the method that described access point apparatus provides according to the various embodiments described above detects after the detected channel that meets described pre-defined rule, also need to be carrying out carrying out switching threshold judgement before channel switching.Described pre-defined rule also comprises according to the transmission delay after described detection acquisition of information channel switching and the transmission delay of current channel, be less than predetermined switching threshold if judge difference and the channel switching delay sum of the transmission delay of transmission delay after described channel switches and described current channel, carry out channel switching; If be not less than, do not carry out channel switching.Wherein said switching threshold is to set in advance according to system requirements the maximum that postpone the fixing switching time in access point apparatus, only have in the time that channel switches time delay used and is less than this switching threshold, just illustrate that channel switching can bring certain gain, switching by channel can be by the more excellent channel of wireless-transmission network guiding.
Concrete, for example, the in the situation that access point apparatus carrying out working channel switching in original working region, when described access point apparatus retrieves after qualified detected channel, carrying out before channel switching, need to first carry out switching threshold judgement, can work as channel when switching time delay used and being less than switching threshold, carry out channel switching, not switch otherwise can hold over work at present channel.
First access point apparatus provided by the invention by judging channel switching threshold before channel switches, guarantee that the generation that channel switches can be by the more excellent channel of transfer of data guiding, avoid unnecessary switching, saved system resource, guaranteed good data transmission quality as far as possible.
In technique scheme, when the clean channel detecting or idle channel are during more than one, described pre-defined rule also comprises, if there are multiple described clean channels, selects at random one of them; If there are multiple described idle channels, select at random one of them.
Concrete, access point apparatus is deployed in a new region need to select working channel or carry out working channel switching in original working region in the situation that, according to the pre-defined rule of access point apparatus, if this region memory is in the time of the clean channel more than or idle channel, access point apparatus can select a qualified channel to access at random.
Access point apparatus provided by the invention judges by the scanning result of the channel information to its each channel in region, in the time that not only a channel belongs to clean channel or idle channel, by a wherein channel of random selection, can guarantee the quality of data transmission channel and the efficiency that channel is selected.
Fig. 2 is the flow chart of embodiment of the present invention access point apparatus channel selecting method, and as shown in Figure 2, the channel selecting method of the access point apparatus that the embodiment of the present invention provides comprises:
The channel information of step 101, each channel to described access point apparatus region scans;
Step 102, the channel information of scanning is detected, obtain detection information;
Step 103, according to described detection information and pre-defined rule, the channel of selector hop communication condition carries out transfer of data.
Concrete, the channel selecting method of the access point apparatus that the embodiment of the present invention provides can, referring to the treatment step of describing in said apparatus embodiment, repeat no more herein.
Access point apparatus channel selecting method provided by the invention is scanned and is detected and condition judgment by the wireless transmission environment in access point apparatus region, optimum selecting goes out good channel and carries out transfer of data, can guarantee the safety and reliability of transfer of data, thereby effectively improve the performance of wireless network.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (14)
1. an access point apparatus, comprises the first radio frequency unit and the communication module being connected with described the first radio frequency unit, it is characterized in that, also comprises:
The second radio frequency unit, for scanning the channel information of each channel of described access point apparatus region;
Channel Detection module, is connected with described the second radio frequency unit, for the channel information of described the second radio frequency unit scanning is detected, obtains detection information; Described detection information comprises the detected corresponding channel number of channel and website quantity;
Radio management module is connected with described communication module and described Channel Detection module respectively, and for according to described detection information and pre-defined rule, the channel of selector hop communication condition carries out transfer of data;
Wherein, if described radio management module according to described pre-defined rule, determine in described detected channel and only have busy channel, the channel of described selector hop communication condition carries out transfer of data, comprising:
From described busy channel, select the busy channel of data transmission period duty ratio T minimum to carry out transfer of data; Wherein, described detection information also comprises data package size and the transmission rate that described detected channel transmits in nearest transmission cycle,
t
ifor the corresponding data transmission period duty ratio of current channel, T
jfor the corresponding data transmission period duty ratio of each adjacent channel of described current channel, m
ijfor each adjacent channel of described current channel interference weight to described current channel; T
iand T
jcomputational methods are all data package size/(the transmission rate * transmission cycles) that transmit in nearest transmission cycle; m
ij=channel isolation factor of influence A
ij* channel disturbance intensity effect factor B
ij, wherein,
2. access point apparatus according to claim 1, is characterized in that, described pre-defined rule comprises: if there is clean channel in described detected channel, preferentially select the clean channel in described detected channel to carry out transfer of data; Described clean channel refer to corresponding website quantity be zero and website quantity corresponding to its adjacent channel be also zero detected channel; Wherein, the isolation of described adjacent channel and described detected channel is less than a predetermined threshold, and described isolation is the absolute difference of the channel number that channel number corresponding to described adjacent channel is corresponding with described detected channel.
3. access point apparatus according to claim 2, is characterized in that, described detection information also comprises the data packet number that described detected channel transmits in nearest transmission cycle;
Accordingly, described pre-defined rule also comprises: if there is not described clean channel, have idle channel, select described idle channel to carry out transfer of data; Though described idle channel refer to corresponding website quantity non-vanishing without transfer of data and its adjacent channel also without the detected channel of transfer of data; Wherein, the data packet number transmitting in nearest transmission cycle by described detected channel judges whether to exist transfer of data.
4. access point apparatus according to claim 3, it is characterized in that, described pre-defined rule also comprises: if there is not described idle channel, determine in described detected channel and only have busy channel, described busy channel comprises: self busy channel, the busy channel of neighbours and complete busy channel, wherein:
Described self busy channel refers to that corresponding website quantity is non-vanishing and have transfer of data, but its adjacent channel is without the detected channel of transfer of data;
The busy channel of described neighbours refers to without transfer of data, but website quantity corresponding to its adjacent channel is non-vanishing and have a detected channel of transfer of data;
Complete busy channel has referred to transfer of data, and its adjacent channel also has the detected channel of transfer of data.
5. access point apparatus according to claim 1, is characterized in that, described detection information also comprises received signal strength RSS and/or signal and the interference-to-noise ratio SINR that described detected channel is corresponding, for obtaining corresponding B according to described RSS and/or SINR
ij.
6. according to the access point apparatus described in any one in claim 1-5, it is characterized in that, pre-defined rule also comprises: the transmission delay after switching according to described detection acquisition of information channel and the transmission delay of current channel, be less than predetermined switching threshold if judge difference and the channel switching delay sum of the transmission delay of transmission delay after described channel switches and described current channel, carry out channel switching; If be not less than, do not carry out channel switching.
7. access point apparatus according to claim 3, is characterized in that, described pre-defined rule also comprises: if there are multiple described clean channels, select at random one of them; If there are multiple described idle channels, select at random one of them.
8. a channel selecting method for access point apparatus, is characterized in that, comprising:
The channel information of the each channel to described access point apparatus region scans;
Channel information to scanning detects, and obtains detection information; Described detection information comprises the detected corresponding channel number of channel and website quantity;
According to described detection information and pre-defined rule, the channel of selector hop communication condition carries out transfer of data;
Wherein, if according to described pre-defined rule, determine in described detected channel and only have busy channel, the channel of described selector hop communication condition carries out transfer of data, comprising:
From described busy channel, select the busy channel of data transmission period duty ratio T minimum to carry out transfer of data; Wherein, described detection information also comprises data package size and the transmission rate that described detected channel transmits in nearest transmission cycle,
t
ifor the corresponding data transmission period duty ratio of current channel, T
jfor the corresponding data transmission period duty ratio of each adjacent channel of described current channel, m
ijfor each adjacent channel of described current channel interference weight to described current channel; T
iand T
jcomputational methods are all data package size/(the transmission rate * transmission cycles) that transmit in nearest transmission cycle; m
ij=channel isolation factor of influence A
ij* channel disturbance intensity effect factor B
ij, wherein,
9. the channel selecting method of access point apparatus according to claim 8, is characterized in that, described pre-defined rule comprises: if there is clean channel in described detected channel, preferentially select the clean channel in described detected channel to carry out transfer of data; Described clean channel refer to corresponding website quantity be zero and website quantity corresponding to its adjacent channel be also zero detected channel; Wherein, the isolation of described adjacent channel and described detected channel is less than a predetermined threshold, and described isolation is the absolute difference of the channel number that channel number corresponding to described adjacent channel is corresponding with described detected channel.
10. the channel selecting method of access point apparatus according to claim 9, is characterized in that, described detection information also comprises the data packet number that described detected channel transmits in nearest transmission cycle;
Accordingly, described pre-defined rule also comprises: if there is not described clean channel, have idle channel, select idle channel to carry out transfer of data; Though described idle channel refer to corresponding website quantity non-vanishing without transfer of data and its adjacent channel also without the detected channel of transfer of data; Wherein, the data packet number transmitting in nearest transmission cycle by described detected channel judges whether to exist transfer of data.
The channel selecting method of 11. access point apparatus according to claim 10, it is characterized in that, described pre-defined rule also comprises: if there is not described idle channel, determine in described detected channel and only have busy channel, described busy channel comprises: self busy channel, the busy channel of neighbours and complete busy channel, wherein:
Described self busy channel refers to that corresponding website quantity is non-vanishing and have transfer of data, but its adjacent channel is without the detected channel of transfer of data;
The busy channel of described neighbours refers to without transfer of data, but website quantity corresponding to its adjacent channel is non-vanishing and have a detected channel of transfer of data;
Complete busy channel has referred to transfer of data, and its adjacent channel also has the detected channel of transfer of data.
The channel selecting method of 12. access point apparatus according to claim 8, is characterized in that, described detection information also comprises RSS and/or the SINR that described detected channel is corresponding, for obtaining corresponding B according to described RSS and/or SINR
ij.
The channel selecting method of the access point apparatus in 13. according to Claim 8-12 described in any one, it is characterized in that, pre-defined rule also comprises: the transmission delay after switching according to described detection acquisition of information channel and the transmission delay of current channel, be less than predetermined switching threshold if judge difference and the channel switching delay sum of the transmission delay of transmission delay after described channel switches and described current channel, carry out channel switching; If be not less than, do not carry out channel switching.
The channel selecting method of 14. access point apparatus according to claim 10, is characterized in that, described pre-defined rule also comprises: if there are multiple described clean channels, select at random one of them; If there are multiple described idle channels, select at random one of them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110346115.2A CN102378218B (en) | 2011-11-04 | 2011-11-04 | Access point equipment of wireless local area network and channel selection method thereof |
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