CN102291794A - Channel switching method and equipment in MESH network - Google Patents
Channel switching method and equipment in MESH network Download PDFInfo
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- CN102291794A CN102291794A CN2011102894382A CN201110289438A CN102291794A CN 102291794 A CN102291794 A CN 102291794A CN 2011102894382 A CN2011102894382 A CN 2011102894382A CN 201110289438 A CN201110289438 A CN 201110289438A CN 102291794 A CN102291794 A CN 102291794A
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Abstract
The invention discloses a channel switching method and equipment in a MESH network. The method comprises: control equipment receives interference parameters from a plurality of member AP (access point) devices; when the control equipment determines that channel switching is in need according to the interference parameters, the control equipment determines a channel to be switched; and the control equipment notifies the plurality of member AP devices to switch to the channel to be switched from the current channel. According to the invention, the channel switching frequency is reduced effectively.
Description
Technical field
The present invention relates to communication technical field, particularly relate to channel switching method and equipment in a kind of MESH network.
Background technology
WLAN (Wireless Local Area Networks, WLAN (wireless local area network)) provides a kind of wireless connections service of local area network (LAN), wireless data access at a high speed can be provided, compare with traditional line access mode that has, WLAN (wireless local area network) makes the use of network free more, has broken away from the constraint of cable and port position, and has removed or reduced numerous and diverse network layout from, only need lay one or more AP (Access Point, access point) can set up LAN.
As shown in Figure 1, be the schematic diagram of MESH network (wireless mesh network), the MESH network is a kind of new WLAN (wireless local area network) type, and different with traditional WLAN is that the AP in the MESH network is wireless connections, and can set up the Radio Link of multi-hop between the AP; Yet for STA (wireless client), traditional WLAN and MESH network are as broad as long.Wherein, MPP (Mesh Portal Point, wireless mesh Ingress node) is for passing through wired WAP (wireless access point) that connects with AC (Access Controller, wireless controller); MP (Mesh AP) is the AP that reaches the standard grade by the Wireless Mesh link; MAP (Mesh Access Point) is for providing the WAP (wireless access point) of Mesh service and access service simultaneously.
In the MESH network, wireless for using between all AP (promptly by the Mesh link) connects, and in order to guarantee the unimpeded of MESH network, it is particularly crucial that the quality of Radio Link just seems; Therefore, the channel to these AP uses of intelligence is regulated and is very important.
In the prior art, the schematic diagram of MESH network as shown in Figure 2, in the process that the channel that AP is used is regulated, AP1 not will consider the situation of AP2 when switching channels, when the current channel of AP1 self is not preferably the time, will switching channels, afterwards, AP2 can only be passive following channel switched, can not stop this action even the channel that is switched is very poor for AP2 yet.When next cycle arrived, AP2 found that the current channel of self is not preferably the time, and AP2 triggers switching channels again, and following that this moment, AP1 also can only be passive switched channel.
So repeatedly, the AP in the MESH network just is in the process of frequent switching channels; Above-mentioned situation only is in simple networking shown in Figure 2, if a large amount of AP is arranged in the MESH network coverage, then frequent channel switching will inevitably take place the Mesh link.
Summary of the invention
The invention provides channel switching method and equipment in a kind of MESH network, switch, reduce the concussion of MESH network with the unnecessary channel of avoiding the MESH network.
In order to achieve the above object, the invention provides the channel switching method in a kind of MESH network, be applied to comprise that this method may further comprise the steps among the WLAN of control appliance and a plurality of member AP equipment:
Described control appliance receives the interference parameter from described a plurality of member AP equipment;
When described control appliance determined that according to described interference parameter needs carry out the channel switching, described control appliance was determined to be switched channel;
Described control appliance notifies described a plurality of member AP equipment to switch to described to be switched channel from current channel.
Described control appliance receives the interference parameter from described a plurality of member AP equipment, also comprises before:
Member AP equipment writes down the neighbours member AP equipment identical with self MESH ID in neighbor list, utilize the interference that other equipment produced outside the neighbours member AP equipment in the described neighbor list, calculate interference parameter, and the interference parameter that calculates is sent to described control appliance.
Described control appliance determines that according to described interference parameter needs carry out channel and switch, and comprising:
Described control appliance receives the precedence information from described a plurality of member AP equipment, and utilizes described a plurality of member AP equipment corresponding priorities information and interference parameter to determine to carry out the channel switching;
Described precedence information comprises priority valve, and the jumping figure of the MESH link between member AP equipment and the control appliance is more little, and the priority valve of member AP equipment correspondence is big more.
Described control appliance utilizes described a plurality of member AP equipment corresponding priorities information and interference parameter to determine to carry out the channel switching, comprising:
Described control appliance utilizes described a plurality of member AP equipment corresponding priorities information and interference parameter to calculate the weighted average of the interference parameter of described a plurality of member AP equipment;
Fall into coefficient if the difference of the weighted average of the weighted average of the interference parameter of current channel and the interference parameter of other channels is not less than to hold, then described control appliance is determined to carry out channel and is switched.
Described interference parameter comprises: collision rate, Packet Error Rate, retransmission rate;
Described control appliance utilizes described a plurality of member AP equipment corresponding priorities information and interference parameter to determine to carry out the channel switching, comprising:
When surpassing default first numerical value greater than the quantity of default collision rate thresholding in the collision rate that described a plurality of member AP equipment report, described control appliance utilizes described a plurality of member AP equipment corresponding priorities information and collision rate to calculate the collision rate weighted average of described a plurality of member AP equipment; Fall into coefficient if the difference of the collision rate weighted average of the collision rate weighted average of current channel and other channels is not less than to hold, then described control appliance is determined to carry out channel and is switched; Perhaps,
When surpassing default second value greater than the quantity of default Packet Error Rate thresholding in the Packet Error Rate that described a plurality of member AP equipment report, described control appliance utilizes described a plurality of member AP equipment corresponding priorities information and Packet Error Rate to calculate the Packet Error Rate weighted average of described a plurality of member AP equipment; Fall into coefficient if the difference of the Packet Error Rate weighted average of the Packet Error Rate weighted average of current channel and other channels is not less than to hold, then described control appliance is determined to carry out channel and is switched; Perhaps,
When surpassing default third value greater than the quantity of default retransmission rate thresholding in the retransmission rate that described a plurality of member AP equipment report, described control appliance utilizes described a plurality of member AP equipment corresponding priorities information and retransmission rate to calculate the retransmission rate weighted average of described a plurality of member AP equipment; If the retransmission rate weighted average of current channel is greater than described default retransmission rate thresholding, described control appliance is determined to carry out channel and is switched.
Described control appliance is determined to be switched channel, specifically comprises:
Be not less than in the difference of the collision rate weighted average of the collision rate weighted average of current channel and other channels and hold when falling into coefficient, described control appliance determines that described to be switched channel is: at Packet Error Rate less than default Packet Error Rate thresholding, in the channel of retransmission rate less than default retransmission rate thresholding, the channel of the weighted average minimum of collision rate;
Be not less than in the difference of the Packet Error Rate weighted average of the Packet Error Rate weighted average of current channel and other channels and hold when falling into coefficient, described control appliance determines that described to be switched channel is: at collision rate less than default collision rate thresholding, in the channel of retransmission rate less than default retransmission rate thresholding, the channel of the weighted average minimum of Packet Error Rate;
During greater than described default retransmission rate thresholding, described control appliance determines that described to be switched channel is: collision rate is less than default collision rate thresholding, and Packet Error Rate is less than default Packet Error Rate thresholding, and the channel of retransmission rate minimum at the retransmission rate weighted average of current channel.
A kind of control appliance is applied to comprise that this control appliance comprises among the WLAN of described control appliance and a plurality of member AP equipment:
Receiver module is used to receive the interference parameter from described a plurality of member AP equipment;
Determination module is used for determining to be switched channel when determining that according to described interference parameter needs carry out the channel switching;
Sending module is used to notify described a plurality of member AP equipment to switch to described to be switched channel from current channel.
Described receiver module also is used to receive the precedence information from described a plurality of member AP equipment;
Described determination module also is used to utilize described a plurality of member AP equipment corresponding priorities information and interference parameter to determine to carry out channel and switches;
Described precedence information comprises priority valve, and the jumping figure of the MESH link between member AP equipment and the control appliance is more little, and the priority valve of member AP equipment correspondence is big more.
Described determination module specifically is used to utilize described a plurality of member AP equipment corresponding priorities information and interference parameter to calculate the weighted average of the interference parameter of described a plurality of member AP equipment;
Fall into coefficient if the difference of the weighted average of the weighted average of the interference parameter of current channel and the interference parameter of other channels is not less than to hold, then determine to carry out channel and switch.
Described interference parameter comprises: collision rate, Packet Error Rate, retransmission rate;
Described determination module, when specifically being used for the collision rate that reports when described a plurality of member AP equipment and surpassing default first numerical value, utilize described a plurality of member AP equipment corresponding priorities information and collision rate to calculate the collision rate weighted average of described a plurality of member AP equipment greater than the quantity of default collision rate thresholding; Fall into coefficient if the difference of the collision rate weighted average of the collision rate weighted average of current channel and other channels is not less than to hold, then determine to carry out channel and switch; Perhaps,
When surpassing default second value greater than the quantity of default Packet Error Rate thresholding in the Packet Error Rate that described a plurality of member AP equipment report, utilize described a plurality of member AP equipment corresponding priorities information and Packet Error Rate to calculate the Packet Error Rate weighted average of described a plurality of member AP equipment; Fall into coefficient if the difference of the Packet Error Rate weighted average of the Packet Error Rate weighted average of current channel and other channels is not less than to hold, then determine to carry out channel and switch; Perhaps,
When surpassing default third value greater than the quantity of default retransmission rate thresholding in the retransmission rate that described a plurality of member AP equipment report, utilize described a plurality of member AP equipment corresponding priorities information and retransmission rate to calculate the retransmission rate weighted average of described a plurality of member AP equipment; If the retransmission rate weighted average of current channel, determines then that need carry out channel switches greater than described default retransmission rate thresholding.
Described determination module, being further used for difference at the collision rate weighted average of the collision rate weighted average of current channel and other channels is not less than and holds when falling into coefficient, determine that described to be switched channel is: at Packet Error Rate less than default Packet Error Rate thresholding, in the channel of retransmission rate less than default retransmission rate thresholding, the channel of the weighted average minimum of collision rate;
Be not less than in the difference of the Packet Error Rate weighted average of the Packet Error Rate weighted average of current channel and other channels and hold when falling into coefficient, determine that described to be switched channel is: at collision rate less than default collision rate thresholding, in the channel of retransmission rate less than default retransmission rate thresholding, the channel of the weighted average minimum of Packet Error Rate;
During greater than described default retransmission rate thresholding, determine that described to be switched channel is: collision rate is less than default collision rate thresholding, and Packet Error Rate is less than default Packet Error Rate thresholding, and the channel of retransmission rate minimum at the retransmission rate weighted average of current channel.
Compared with prior art, the present invention has the following advantages at least: when MESH network automatic channel is calibrated, consider that based on the MESH network channel switches, solved the situation of each member AP equipment independent operating, and effectively reduced the frequency that channel switches.
Description of drawings
Fig. 1 and Fig. 2 are the schematic diagrames of MESH network in the prior art;
Fig. 3 is the channel switching method flow chart in a kind of MESH network provided by the invention;
Fig. 4 and Fig. 5 are application scenarios schematic diagrames of the present invention;
Fig. 6 is the structural representation of a kind of control appliance of proposing of the present invention.
Embodiment
The present invention proposes the channel switching method in a kind of MESH network, is applied to comprise that among the WLAN of control appliance and a plurality of member AP equipment, control appliance can be the AC equipment in the MESH network; Also can be the CAP in the MESH network (Control AP, control AP), CAP is that each AP equipment in the MESH network is elected, because MPP is easy to management, can specify MPP by the keeper when therefore selecting CAP is CAP; When AC equipment was control appliance, member AP equipment was MPP, MP, MAP etc.; When MPP was control appliance, member AP equipment was MP, MAP etc.
Based on above-mentioned network condition, as shown in Figure 3, this method may further comprise the steps:
Among the present invention, member AP equipment needs the maintenance of neighbor tabulation, and writes down the information (as MAC Address) of the neighbours member AP equipment identical with self MESH ID in neighbor list; Concrete, member AP equipment can write down the source MAC (being the MAC Address of neighbours member AP equipment) of the Beacon frame identical with self MESH ID by modes such as passive listenings; The interference that it should be noted that the neighbours member AP equipment generation of writing down in the neighbor list can not become the factor that channel quality degenerates; Therefore, when calculating interference parameter, interference parameter is calculated in the interference that other equipment produced outside the neighbours member AP equipment in the member AP equipment utilization neighbor list.
Interference parameter comprises: collision rate (I), Packet Error Rate (P), retransmission rate (R); For each member AP equipment, all to constantly collect collision rate (I), Packet Error Rate (P), retransmission rate information such as (R).For example, member AP equipment interval 10s collects once, and the numerical value of record collision rate (I), Packet Error Rate (P), retransmission rate (R), in a calibration cycle (as 3-180 minute, can dispose) calculate the mean value of these parameters, at last result of calculation is sent to control appliance.
For example, collision rate (I)=4% in the channel reporting of receiving for the first time, then current collision rate is 4%; Collision rate (I)=6% in the channel reporting of receiving for the second time, then current collision rate is 5%; Collision rate in the channel reporting of receiving for the third time (I)=7%, then current collision rate are 6%, i.e. (5+7)/2.
Preferably, member AP equipment can also send to control appliance with the precedence information of self, and precedence information comprises priority valve, and the jumping figure of the MESH link between member AP equipment and the control appliance is more little, and the priority valve of member AP equipment correspondence is big more.
For example, by the keeper priority of control appliance (is the scene of CAP at control appliance) is made as 0, in a single day expression CAP detects the bad just switching channels immediately of self channel quality; The priority of the member AP equipment that will jump apart from control appliance 1 is made as 10, and the priority of the member AP equipment that will jump apart from control appliance 2 is made as 8, by that analogy; Or, will be made as 10 apart from the priority of control appliance 1 jumping and the 2 member AP equipment of jumping, will be made as 8 apart from the priority of control appliance 3 jumpings and the 4 member AP equipment of jumping, by that analogy; This is provided with situation and can selects arbitrarily, does not repeat them here.
Preferably, when member AP equipment sent the precedence information of self, control appliance can also receive the precedence information from a plurality of member AP equipment.
Control appliance can utilize the interference parameter of a plurality of member AP equipment correspondences to calculate the mean value of the interference parameter of a plurality of member AP equipment; Fall into coefficient if the difference of the mean value of the mean value of the interference parameter of current channel and the interference parameter of other channels is not less than to hold, then control appliance determines to carry out the channel switching.
Preferably, behind the precedence information that receives from a plurality of member AP equipment, control appliance can also utilize a plurality of member AP equipment corresponding priorities information and interference parameter to determine to carry out the channel switching; Concrete, control appliance utilizes a plurality of member AP equipment corresponding priorities information and interference parameter to calculate the weighted average of the interference parameter of a plurality of member AP equipment; Fall into coefficient if the difference of the weighted average of the weighted average of the interference parameter of current channel and the interference parameter of other channels is not less than to hold, then control appliance determines to carry out the channel switching.
It should be noted that, utilize the processing mode of weighted average of the mean value of interference parameter or interference parameter similar, just introduced the feature of preferred weights in the weighted average of interference parameter, the processing of follow-up weighted average with interference parameter is elaborated.
Among the present invention, the configurable default collision rate thresholding of control appliance, default Packet Error Rate thresholding, default retransmission rate thresholding, the explanation channel quality is bad during greater than above-mentioned thresholding; Default first numerical value (can be 3 numerical informations such as grade, also can be 20% equal proportion information), default second value, default third value; Above-mentioned default first numerical value, default second value can be identical with default third value, and the bad AP of configuration arbitrarily, and expression channel quality according to actual needs takies the percent quantities of total AP quantity.
The collision rate that reports when member AP equipment is greater than default collision rate thresholding, and when surpassing default first numerical value greater than the quantity of the collision rate of default collision rate thresholding, considers that then carrying out channel switches; In like manner, when surpassing default second value greater than the quantity of default Packet Error Rate thresholding in the Packet Error Rate that a plurality of member AP equipment report, consider that then carrying out channel switches; When surpassing default third value greater than the quantity of default retransmission rate thresholding in the retransmission rate that a plurality of member AP equipment report, consider that then carrying out channel switches.
For example, have 100 AP equipment to report collision rate, and default collision rate thresholding is 20%, default first numerical value is 10% o'clock, then reports collision rate greater than 20% the time when 11 AP equipment, knows based on collision rate and considers to carry out the channel switching; When 9 AP equipment report collision rate greater than 20% the time, know that based on collision rate not needing to consider to carry out channel switches.
Among the present invention, after knowing that based on collision rate considering to carry out channel switches, control appliance also needs to utilize a plurality of member AP equipment corresponding priorities information and collision rate to calculate the collision rate weighted average of a plurality of member AP equipment; Fall into coefficient if the difference of the collision rate weighted average of the collision rate weighted average of current channel and other channels is not less than to hold, then control appliance determines to carry out the channel switching.
After knowing that based on Packet Error Rate considering to carry out channel switches, control appliance utilizes a plurality of member AP equipment corresponding priorities information and Packet Error Rate to calculate the Packet Error Rate weighted average of a plurality of member AP equipment; Fall into coefficient if the difference of the Packet Error Rate weighted average of the Packet Error Rate weighted average of current channel and other channels is not less than to hold, then control appliance determines to carry out the channel switching.
After knowing that based on retransmission rate considering to carry out channel switches, because retransmission rate is very big to the channel quality influence, therefore do not consider to hold sunken coefficient, control appliance utilizes a plurality of member AP equipment corresponding priorities information and retransmission rate to calculate the retransmission rate weighted average of a plurality of member AP equipment; If the retransmission rate weighted average of current channel is greater than default retransmission rate thresholding, then control appliance determines that directly need carry out channel switches.
Need to prove that above-mentioned parameter is preset first numerical value, default second value, default third value etc. and can be regulated, so that keeper's Control Network more easily; For example, what these parameters can be provided with is less, thereby guarantees the work quality of MESH network, but can sacrifice the MESH stability of network; What these parameters can be provided with is bigger, thereby guarantees the MESH stability of network, but can make the work quality of MESH network reduce.
When calculating collision rate weighted average, Packet Error Rate weighted average, retransmission rate weighted average, suppose that I (1), I (2), I (3) etc. are the collision rates of member AP equipment, I (always) is the collision rate weighted average, P (1), P (2), P (3) etc. are the Packet Error Rates of member AP equipment, P (always) is the Packet Error Rate weighted average, R (1), R (2), R (3) etc. are the retransmission rates of member AP equipment, and R (always) is the retransmission rate weighted average; Then:
I (always)=(weights 1*I (1)+weights 2*I (2) ...)/each member AP equipment weights sum;
P (always)=(weights 1*P (1)+weights 2*P (2) ...)/each member AP equipment weights sum;
R (always)=(weights 1*R (1)+weights 2*R (2) ...)/each member AP equipment weights sum;
Above-mentioned weights 1 are respectively collision rate, Packet Error Rate, the retransmission rate of member AP equipment 1 for the preferred weights of member AP equipment 1, I (1), P (1), R (1), by that analogy.
It should be noted that when calculating the collision rate weighted average, need to calculate the collision rate weighted average of current channel and the collision rate weighted average of other channels; When calculating the Packet Error Rate weighted average, need to calculate the Packet Error Rate weighted average of current channel and the Packet Error Rate weighted average of other channels; When calculating the retransmission rate weighted average, only need to calculate the retransmission rate weighted average of current channel.
Further, if the I (always) of the I of current channel (always)-other channels＞=appearance falls into coefficient (T), illustrate that then current channel is bad, and these other channels possessed the precondition that becomes working channel; If the P (always) of the P of current channel (always)-other channels＞=appearance falls into coefficient (T), illustrate that then current channel is bad, and these other channels possessed the precondition that becomes working channel; If the R of current channel (always) illustrates then that greater than default retransmission rate thresholding current channel is bad.
Preferably, if know that based on collision rate need carry out channel switches (be the difference of collision rate weighted average and the collision rate weighted average of other channels of current channel be not less than hold sunken coefficient), then control appliance determines that to be switched channel is: at Packet Error Rate less than default Packet Error Rate thresholding, in the channel of retransmission rate less than default retransmission rate thresholding, the channel of the weighted average minimum of collision rate.
If based on Packet Error Rate know need carry out channel switch (be the difference of Packet Error Rate weighted average and the Packet Error Rate weighted average of other channels of current channel be not less than hold sunken coefficient) then control appliance determine that to be switched channel is: at collision rate less than default collision rate thresholding, in the channel of retransmission rate less than default retransmission rate thresholding, the channel of the weighted average minimum of Packet Error Rate.
If based on retransmission rate know need carry out channel switch (the retransmission rate weighted average that is current channel is greater than described default retransmission rate thresholding) then control appliance determine that to be switched channel is: collision rate is less than default collision rate thresholding, Packet Error Rate is less than default Packet Error Rate thresholding, and the channel of retransmission rate minimum.
Among the present invention, trigger channel by control appliance and switch, and the channel-switch-announcement message is issued each opposite end that MESH connects, other member AP equipment are after receiving the channel-switch-announcement message, continue to be transmitted to each opposite end that MESH connects, switch with the channel that triggers the MESH network.
In addition, after the channel-switch-announcement message is sent completely, before switching channels, can wait for that switches a stand-by period (default being made as 5 seconds), this switching stand-by period can dispose according to the scale of network, is used for guaranteeing as much as possible that each member AP equipment all can receive the channel-switch-announcement message.
In the practical application, if being arranged, member AP equipment (is example with member AP equipment 1) do not receive the channel-switch-announcement message, then do not know should switching channels for member AP equipment 1, and the upstream member AP equipment of member AP equipment 1 has switched channel, thereby cause the channel of member AP equipment 1 and the channel of upstream member AP equipment not to meet, MESH is connected disconnect.
After MESH connect to disconnect, if the downstream of member AP equipment 1 has not had member AP equipment, member AP equipment 1 can member AP the equipment very fast and upstream rebulids MESH and is connected; If the downstream of member AP equipment 1 also has member AP equipment, then can use the up link measuring ability, make member AP equipment 1 disconnect whole links, connect with upstream member AP equipment again then, the up link measuring ability can use existing the realization.
Below back mechanism is elaborated.
With CAP (appointment MPP is CAP) is that control appliance is an example; the problem that causes the MESH network to can not get serving for fear of the CAP fault; usually can in the MESH network, elect many CAP; application scenarios schematic diagram as shown in Figure 4; be deployed with two MPP; can elect a MPP is main CAP, and another MPP is backup CAP.Main CAP need be synchronized to the channel information of receiving (being interfere information, precedence information etc.) on the backup CAP, and backup CAP receives only channel information, but does not process; After main CAP breaks down, backup CAP will become main CAP and realize correlation function.
Use wireline side to do heartbeat between main CAP and the backup CAP, the channel information sync message also uses the wireline side transmission.At abnormal conditions:
(1) wireless side is unusual, quality changes constantly owing to eat dishes without rice or wine, can be all not identical at every turn, therefore continuous three homogeneous phases of the channel information of each the member AP equipment in the channel information sync message that backup CAP receives simultaneously, think that then the radio frequency of main CAP goes wrong, can not normally collect channel information, determine self to be converted to main CAP.
(2) there is line end unusual,, then backs up CAP and carry out the up link detection if continuous 3 eartbeat intervals of backup CAP can not receive heartbeat message, wired mouthful state is made as test point, if self wired mouthful is UP, it is unusual to think that then main CAP occurs, and determines self to be converted to main CAP; Perhaps, backup CAP carries out up link and detects, and wired mouthful state is made as test point, if self wired mouthful is DOWN, then thinks to back up CAP and occurs disconnecting its all descending wireless connections unusually.
In sum, among the present invention, can realize that the rationalization of channel is selected, be foundation with the quality of whole M ESH network, and can avoid the unnecessary channel of MESH network to switch, thereby reach the purpose that reduces the concussion of MESH network; When MESH network automatic channel is calibrated, solved the situation of each member AP equipment independent operating, and effectively reduced the frequency that channel switches; It is still available to need only current channel during selective channel, then remains on current channel, rather than goes to select preferred channels work, can avoid the frequent switching of channel; Channel calibration is by the control appliance unified management, and the interfere information that each member AP device just will be collected channel quality gets final product, and has effectively reduced the live load of member AP equipment.
Below in conjunction with concrete example workflow of the present invention is described.
Example 1
As shown in Figure 5, current MESH network work is at channel 149; CAP priority is made as 0, and the priority level of MP1, MP2, MP3, MP6, MP7 is 4 (and the jumping figure between the CAP is that 1 jumping or 2 is jumped), and the priority level of MP4, MP5 is 3 (and the jumping figure between the CAP is 3 jumpings); On CAP, will preset the collision rate thresholding and be configured to 40%, to preset the Packet Error Rate thresholding and be configured to 30%, to preset the retransmission rate thresholding and be configured to 21%, to preset first numerical value, default second value, default third value and all be configured to 20%, to hold sunken coefficient and be configured to 10%, on the member AP equipment calibration cycle will be configured to 10 minutes.
Suppose that current MESH network disposes, can not occur again increasing and/or the situation of removing members AP equipment that CAP and each member AP equipment are started working; Each member AP equipment is collected the channel quality information of eating dishes without rice or wine to go up each channel in real time; After 10 minutes collection of a calibration cycle, each member AP equipment (comprises each quality of channel report in this cycle: the priority of the I of the I of current channel, P, R and other each channels, P, R and this member AP equipment) send to CAP.
The treatment mechanism of considering parameter I, P, R is similar, follow-uply comes simple declaration with collision rate I, and for the processing of Packet Error Rate P and retransmission rate R, I is similar with collision rate, follow-up repeating no more.
Receive the quality report of each member AP equipment as CAP after, can obtain the testing result of each the member AP equipment shown in the table 1,149 (I) represent the value of the collision rate of each member AP equipment on 149 channels, and 153 (I) represent the value of the collision rate of each member AP equipment on 153 channels, by that analogy; And 149 channels are current channel.
Table 1
Because default collision rate thresholding is 40%, default first numerical value is 20%, on current channel 149, in the collision rate that MP1 reports to MP7, the collision rate that has only MP7 surpasses default first numerical value (being 1/7=14.3, less than 20%) greater than 40% through the quantity that calculates greater than the collision rate of presetting the collision rate thresholding, therefore CAP thinks that the channel quality of MESH network does not also reach switching condition, continues to use current channel 149 work.
Example 2
Still be example with Fig. 5, current MESH network work is at channel 149; The priority level of MP1, MP2, MP3, MP6, MP7 is 4, and the priority level of MP4, MP5 is 3; On CAP, will preset the collision rate thresholding and be configured to 40%, to preset the Packet Error Rate thresholding and be configured to 30%, to preset the retransmission rate thresholding and be configured to 21%, to preset first numerical value, default second value, default third value and all be configured to 10%, to hold sunken coefficient and be configured to 10%, on the member AP equipment calibration cycle will be configured to 10 minutes.
Each member AP equipment is collected the channel quality information of each channel, after 10 minutes collection of a calibration cycle, each quality of channel report (priority that comprises I, P, R and this member AP equipment of I, P, R and other each channels of current channel) in this cycle is sent to CAP.Follow-uply come simple declaration with collision rate I, CAP can obtain the testing result of each the member AP equipment shown in the table 1.
Because default collision rate thresholding is 40%, default first numerical value is 10%, on current channel 149, in the collision rate that MP1 reports to MP7, the collision rate that has only MP7 surpasses default first numerical value (being 1/7=14.3, greater than 10%) greater than 40% through the quantity that calculates greater than the collision rate of presetting the collision rate thresholding, therefore CAP thinks the current channel quality variation of MESH network, considers to carry out channel and switches.
Afterwards, CAP need calculate the I (always) on each channel; For 149 channels, I (always)=(4*3+4*7+4*6+3*9+3*8+4*7+4*50)/(4+4+4+3+3+4+4)=14.0%; For 153 channels, I (always)=2.5%; For 157 channels, I (always)=20.6%; For 161 channels, I (always)=8.8%; For 165 channels, I (always)=3.7%.
I (always)=11.5%＞tolerance limit coefficient of the I of 149 channels (always)-153 channel possesses switching condition; I (always)=-6.6%＜tolerance limit coefficient of the I of 149 channels (always)-157 channel does not possess switching condition; I (always)=5.2%＜tolerance limit coefficient of the I of 149 channels (always)-161 channel does not possess switching condition; I (always)=10.3%＞tolerance limit coefficient of the I of 149 channels (always)-165 channel possesses switching condition.
Because 153 channels and 165 channels all satisfy switching condition, the channel of then selecting the weighted average minimum of collision rate is to be switched channel; Because the I (always)=3.7% of I (always)=2.5%, 165 channel of 153 channels, therefore selecting 153 channels is to be switched channel.
Afterwards, CAP notifies each member AP equipment that channel is switched to 153 channels by 149 channels, and the MESH network switches to 153 channels with channel after 5 seconds.
Inventive concept based on same with said method the invention allows for a kind of control appliance, is applied to comprise that as shown in Figure 6, this control appliance comprises among the WLAN of described control appliance and a plurality of member AP equipment:
Sending module 13 is used to notify described a plurality of member AP equipment to switch to described to be switched channel from current channel.
Described receiver module 11 also is used to receive the precedence information from described a plurality of member AP equipment;
Described determination module 12 also is used to utilize described a plurality of member AP equipment corresponding priorities information and interference parameter to determine to carry out channel and switches;
Described precedence information comprises priority valve, and the jumping figure of the MESH link between member AP equipment and the control appliance is more little, and the priority valve of member AP equipment correspondence is big more.
Described determination module 12 specifically is used to utilize described a plurality of member AP equipment corresponding priorities information and interference parameter to calculate the weighted average of the interference parameter of described a plurality of member AP equipment;
Fall into coefficient if the difference of the weighted average of the weighted average of the interference parameter of current channel and the interference parameter of other channels is not less than to hold, then determine to carry out channel and switch.
Described interference parameter comprises: collision rate, Packet Error Rate, retransmission rate; Described determination module 12, when specifically being used for the collision rate that reports when described a plurality of member AP equipment and surpassing default first numerical value, utilize described a plurality of member AP equipment corresponding priorities information and collision rate to calculate the collision rate weighted average of described a plurality of member AP equipment greater than the quantity of default collision rate thresholding; Fall into coefficient if the difference of the collision rate weighted average of the collision rate weighted average of current channel and other channels is not less than to hold, then determine to carry out channel and switch; Perhaps,
When surpassing default second value greater than the quantity of default Packet Error Rate thresholding in the Packet Error Rate that described a plurality of member AP equipment report, utilize described a plurality of member AP equipment corresponding priorities information and Packet Error Rate to calculate the Packet Error Rate weighted average of described a plurality of member AP equipment; Fall into coefficient if the difference of the Packet Error Rate weighted average of the Packet Error Rate weighted average of current channel and other channels is not less than to hold, then determine to carry out channel and switch; Perhaps,
When surpassing default third value greater than the quantity of default retransmission rate thresholding in the retransmission rate that described a plurality of member AP equipment report, utilize described a plurality of member AP equipment corresponding priorities information and retransmission rate to calculate the retransmission rate weighted average of described a plurality of member AP equipment; If the retransmission rate weighted average of current channel, determines then that need carry out channel switches greater than described default retransmission rate thresholding.
Described determination module 12, being further used for difference at the collision rate weighted average of the collision rate weighted average of current channel and other channels is not less than and holds when falling into coefficient, determine that described to be switched channel is: at Packet Error Rate less than default Packet Error Rate thresholding, in the channel of retransmission rate less than default retransmission rate thresholding, the channel of the weighted average minimum of collision rate;
Be not less than in the difference of the Packet Error Rate weighted average of the Packet Error Rate weighted average of current channel and other channels and hold when falling into coefficient, determine that described to be switched channel is: at collision rate less than default collision rate thresholding, in the channel of retransmission rate less than default retransmission rate thresholding, the channel of the weighted average minimum of Packet Error Rate;
During greater than described default retransmission rate thresholding, determine that described to be switched channel is: collision rate is less than default collision rate thresholding, and Packet Error Rate is less than default Packet Error Rate thresholding, and the channel of retransmission rate minimum at the retransmission rate weighted average of current channel.
Wherein, each module of apparatus of the present invention can be integrated in one, and also can separate deployment.Above-mentioned module can be merged into a module, also can further split into a plurality of submodules.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, module in the accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
The invention described above sequence number is not represented the quality of embodiment just to description.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (11)
1. the channel switching method in the MESH network is applied to comprise among the WLAN of control appliance and a plurality of member AP equipment, it is characterized in that this method may further comprise the steps:
Described control appliance receives the interference parameter from described a plurality of member AP equipment;
When described control appliance determined that according to described interference parameter needs carry out the channel switching, described control appliance was determined to be switched channel;
Described control appliance notifies described a plurality of member AP equipment to switch to described to be switched channel from current channel.
2. the method for claim 1 is characterized in that, described control appliance receives the interference parameter from described a plurality of member AP equipment, also comprises before:
Member AP equipment writes down the neighbours member AP equipment identical with self MESH ID in neighbor list, utilize the interference that other equipment produced outside the neighbours member AP equipment in the described neighbor list, calculate interference parameter, and the interference parameter that calculates is sent to described control appliance.
3. the method for claim 1 is characterized in that, described control appliance determines that according to described interference parameter needs carry out channel and switch, and comprising:
Described control appliance receives the precedence information from described a plurality of member AP equipment, and utilizes described a plurality of member AP equipment corresponding priorities information and interference parameter to determine to carry out the channel switching;
Described precedence information comprises priority valve, and the jumping figure of the MESH link between member AP equipment and the control appliance is more little, and the priority valve of member AP equipment correspondence is big more.
4. method as claimed in claim 3 is characterized in that, described control appliance utilizes described a plurality of member AP equipment corresponding priorities information and interference parameter to determine to carry out the channel switching, comprising:
Described control appliance utilizes described a plurality of member AP equipment corresponding priorities information and interference parameter to calculate the weighted average of the interference parameter of described a plurality of member AP equipment;
Fall into coefficient if the difference of the weighted average of the weighted average of the interference parameter of current channel and the interference parameter of other channels is not less than to hold, then described control appliance is determined to carry out channel and is switched.
5. method as claimed in claim 3 is characterized in that, described interference parameter comprises: collision rate, Packet Error Rate, retransmission rate;
Described control appliance utilizes described a plurality of member AP equipment corresponding priorities information and interference parameter to determine to carry out the channel switching, comprising:
When surpassing default first numerical value greater than the quantity of default collision rate thresholding in the collision rate that described a plurality of member AP equipment report, described control appliance utilizes described a plurality of member AP equipment corresponding priorities information and collision rate to calculate the collision rate weighted average of described a plurality of member AP equipment; Fall into coefficient if the difference of the collision rate weighted average of the collision rate weighted average of current channel and other channels is not less than to hold, then described control appliance is determined to carry out channel and is switched; Perhaps,
When surpassing default second value greater than the quantity of default Packet Error Rate thresholding in the Packet Error Rate that described a plurality of member AP equipment report, described control appliance utilizes described a plurality of member AP equipment corresponding priorities information and Packet Error Rate to calculate the Packet Error Rate weighted average of described a plurality of member AP equipment; Fall into coefficient if the difference of the Packet Error Rate weighted average of the Packet Error Rate weighted average of current channel and other channels is not less than to hold, then described control appliance is determined to carry out channel and is switched; Perhaps,
When surpassing default third value greater than the quantity of default retransmission rate thresholding in the retransmission rate that described a plurality of member AP equipment report, described control appliance utilizes described a plurality of member AP equipment corresponding priorities information and retransmission rate to calculate the retransmission rate weighted average of described a plurality of member AP equipment; If the retransmission rate weighted average of current channel is greater than described default retransmission rate thresholding, described control appliance is determined to carry out channel and is switched.
6. method as claimed in claim 5 is characterized in that, described control appliance is determined to be switched channel, specifically comprises:
Be not less than in the difference of the collision rate weighted average of the collision rate weighted average of current channel and other channels and hold when falling into coefficient, described control appliance determines that described to be switched channel is: at Packet Error Rate less than default Packet Error Rate thresholding, in the channel of retransmission rate less than default retransmission rate thresholding, the channel of the weighted average minimum of collision rate;
Be not less than in the difference of the Packet Error Rate weighted average of the Packet Error Rate weighted average of current channel and other channels and hold when falling into coefficient, described control appliance determines that described to be switched channel is: at collision rate less than default collision rate thresholding, in the channel of retransmission rate less than default retransmission rate thresholding, the channel of the weighted average minimum of Packet Error Rate;
During greater than described default retransmission rate thresholding, described control appliance determines that described to be switched channel is: collision rate is less than default collision rate thresholding, and Packet Error Rate is less than default Packet Error Rate thresholding, and the channel of retransmission rate minimum at the retransmission rate weighted average of current channel.
7. a control appliance is applied to comprise among the WLAN of described control appliance and a plurality of member AP equipment, it is characterized in that this control appliance comprises:
Receiver module is used to receive the interference parameter from described a plurality of member AP equipment;
Determination module is used for determining to be switched channel when determining that according to described interference parameter needs carry out the channel switching;
Sending module is used to notify described a plurality of member AP equipment to switch to described to be switched channel from current channel.
8. control appliance as claimed in claim 7 is characterized in that,
Described receiver module also is used to receive the precedence information from described a plurality of member AP equipment;
Described determination module also is used to utilize described a plurality of member AP equipment corresponding priorities information and interference parameter to determine to carry out channel and switches;
Described precedence information comprises priority valve, and the jumping figure of the MESH link between member AP equipment and the control appliance is more little, and the priority valve of member AP equipment correspondence is big more.
9. control appliance as claimed in claim 8 is characterized in that,
Described determination module specifically is used to utilize described a plurality of member AP equipment corresponding priorities information and interference parameter to calculate the weighted average of the interference parameter of described a plurality of member AP equipment;
Fall into coefficient if the difference of the weighted average of the weighted average of the interference parameter of current channel and the interference parameter of other channels is not less than to hold, then determine to carry out channel and switch.
10. control appliance as claimed in claim 8 is characterized in that, described interference parameter comprises: collision rate, Packet Error Rate, retransmission rate;
Described determination module, when specifically being used for the collision rate that reports when described a plurality of member AP equipment and surpassing default first numerical value, utilize described a plurality of member AP equipment corresponding priorities information and collision rate to calculate the collision rate weighted average of described a plurality of member AP equipment greater than the quantity of default collision rate thresholding; Fall into coefficient if the difference of the collision rate weighted average of the collision rate weighted average of current channel and other channels is not less than to hold, then determine to carry out channel and switch; Perhaps,
When surpassing default second value greater than the quantity of default Packet Error Rate thresholding in the Packet Error Rate that described a plurality of member AP equipment report, utilize described a plurality of member AP equipment corresponding priorities information and Packet Error Rate to calculate the Packet Error Rate weighted average of described a plurality of member AP equipment; Fall into coefficient if the difference of the Packet Error Rate weighted average of the Packet Error Rate weighted average of current channel and other channels is not less than to hold, then determine to carry out channel and switch; Perhaps,
When surpassing default third value greater than the quantity of default retransmission rate thresholding in the retransmission rate that described a plurality of member AP equipment report, utilize described a plurality of member AP equipment corresponding priorities information and retransmission rate to calculate the retransmission rate weighted average of described a plurality of member AP equipment; If the retransmission rate weighted average of current channel, determines then that need carry out channel switches greater than described default retransmission rate thresholding.
11. control appliance as claimed in claim 10 is characterized in that,
Described determination module, being further used for difference at the collision rate weighted average of the collision rate weighted average of current channel and other channels is not less than and holds when falling into coefficient, determine that described to be switched channel is: at Packet Error Rate less than default Packet Error Rate thresholding, in the channel of retransmission rate less than default retransmission rate thresholding, the channel of the weighted average minimum of collision rate;
Be not less than in the difference of the Packet Error Rate weighted average of the Packet Error Rate weighted average of current channel and other channels and hold when falling into coefficient, determine that described to be switched channel is: at collision rate less than default collision rate thresholding, in the channel of retransmission rate less than default retransmission rate thresholding, the channel of the weighted average minimum of Packet Error Rate;
During greater than described default retransmission rate thresholding, determine that described to be switched channel is: collision rate is less than default collision rate thresholding, and Packet Error Rate is less than default Packet Error Rate thresholding, and the channel of retransmission rate minimum at the retransmission rate weighted average of current channel.
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