CN103561474B - A kind of method strengthening Zigbee communication performance - Google Patents
A kind of method strengthening Zigbee communication performance Download PDFInfo
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- CN103561474B CN103561474B CN201310556706.1A CN201310556706A CN103561474B CN 103561474 B CN103561474 B CN 103561474B CN 201310556706 A CN201310556706 A CN 201310556706A CN 103561474 B CN103561474 B CN 103561474B
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Abstract
The invention discloses a kind of method strengthening zigbee communication performance, is this method first from 2.4G? the frequency spectrum angle analysis of the ISM band reason of zigbee Communication Jamming, then proposes a kind ofly to deposit the method that can improve zigbee communication link performance in an interference situation.The method, based on the multichannel communication mechanism of zigbee, have employed interference detection, Channel assignment and channel maintenance to realize the operation to multichannel communication.Depositing in an interference situation, the method can distinguish interference in various degree, and to a certain extent can the communication performance of zigbee link under predicted interference, in interference environment, the method can hide interference, makes zigbee node switching channels, effectively improves the communication performance of zigbee link, than traditional single-channel communication pattern, the throughput of the method can reach 3 times.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to the optimization method of zigbee wireless communication protocol, specifically a kind of method strengthening zigbee communication performance.
Background technology
In order to realize the Automated condtrol of industry, family and building, the mankind are freed from wired environment, to replace cable for target, for wireless personal local area network (WPAN, WirelessPersonalAreaNetwork) the short-distance wireless communication technology standard of scope obtains and develops rapidly, and typical technology standard has bluetooth (Bluetooth), ZigBee, Wireless USB (WirelessUSB), WLAN (wireless local area network) Wi-Fi(IEEE802.11b/g) etc.When people enjoy conveniently, the electromagnetic compatibility problem of these technology shows especially day by day.Because these technology all have selected 2.4GHz(2.4 ~ 2.483GHz) ISM band, add the interference source such as cordless telephone and microwave oven, just make this frequency range day by day crowded.Zigbee is operated in industry, science, medical treatment (ISM) frequency range, define two physical layers, i.e. 2.4GHz frequency range and 868/915MHz frequency range physical layer, and the ISM band of 868MHz and 915MHz only uses in Europe and North America respectively, so it operates mainly in global range the ISM band of the 2.4GHz exempting from licence.Therefore co-channel interference is the principal element affecting zigbee communication performance.
Zigbee is the wireless communication technology of the low data rate recently released, and have employed IEEE802.15.4 as its physical layer and Medium Access Layer specification.Wi-Fi is the mainstream technology of the WLAN (wireless local area network) based on IEEE802.11b standard, and along with the continuous growth of low rate application market demand, the possibility of Zigbee and Wi-Fi system coexistence is increasing.But owing to both operating mainly in the ISM band of 2.4GHz, they inevitably produce mutual interference, therefore under co-channel interference, the performance strengthening zigbee radio communication needs the problem of solution badly.
Summary of the invention
The object of the invention is to, for the impact of existing co-channel interference on zigbee communication performance, propose a kind of method strengthening zigbee communication performance, this method adopts multichannel to realize, and makes full use of idle frequency spectrum resource, improves the communication performance of zigbee link.
Technical scheme of the present invention is the unidirectional delivery according to the intrinsic MANET characteristic of radio sensing network and data flow, and multi-channel operation realizes.
A kind of method strengthening Zigbee communication performance, it is based on Zigbee node multichannel communication mode, with representing the channel seizure ratio u of interference density and representing that the strength indicator ν combination of interference strength represents the interference of working channel, and be denoted as interference prediction index < u, ν >; Setting threshold u
h, the channel seizure ratio u of node detecting periodically current operating channel; When the channel seizure ratio u detecting current operating channel exceeds threshold value u
htime, the whole available channel of node scan; To the interference prediction index < u of whole available channel, ν > compares, and selects the minimum available channel of interference prediction index and switch to this available channel to continue communication.
Its concrete steps are:
1) threshold value setting: threshold value u
hget [25%, 50%];
2) interference detection: the channel seizure ratio u of node detecting periodically current operating channel, if channel seizure ratio u exceedes setting threshold u
h, then channel selection procedure is started;
3) Channel assignment: after Channel assignment starts, trigger the interference of present node to all available channels to assess, calculate interference prediction index < u, ν >, by the interference prediction index < u of each channel, ν > compares, channel for the purpose of the available channel selecting interference prediction index minimum; Comparison procedure is: compare channel seizure ratio u, chooses channel for the purpose of the minimum channel of channel seizure ratio u; If there is the available channel that channel seizure ratio u minimum value is identical, then the strength indicator ν of described available channel is compared, choose channel for the purpose of the minimum channel of wherein strength indicator ν.
Described cycle T
rssi=10ms.
More excellent, described threshold value u
hbe 25%.
As another kind of execution mode, described channel selection procedure is: after Channel assignment starts, trigger the interference of present node to all available channels to assess, calculate the interference prediction index < u of each available channel, ν > also compares, channel minimum for interference prediction index in available channel is designated as best channel, and this channel disturbance prediction index is designated as < u
best, v
best>; Then present node traversal neighbor channel table, to the interference prediction index < u of each neighbor channel, ν > compares, channel minimum for interference prediction index in neighbor channel is designated as nbrbest channel, and this channel disturbance prediction index is designated as < u
nbrbest, v
nbrbest>; Last best channel and nbrbest channel compare, setting slack variable u
bestwith
if, u
nbbrtesat [u
best,u
best+
] between, and v
nbrbestat [v
best, v
best+
] between, then select channel for the purpose of nbrbest channel, otherwise select channel for the purpose of best channel.
In the second execution mode, described in
be 8%, described in
for 10dBm.
Interference prediction index < u of the present invention, the acquisition methods of ν > is, first obtains the measured value of u or ν by the interference density of many wheel detection operations channels or interference strength, is designated as X'
j, repetitive measurement obtains
Then process is weighted respectively by following formula:
X
n＝(1-α)*X
n-1+α*X'n≥2
Wherein, X' is the measured value of current obtained u or ν, X
nfor the value of u or ν after n exponent-weighted average, * is first derivative, and α is exponential weighting coefficient,
< u is obtained, ν > couple, as the index of interference prediction after final index weighted average.
Described weight coefficient α value 0.125.
Beneficial effect of the present invention:
1,
this method adopts threshold value setting, interference detection, Channel assignment three kinds of workflows to improve the communication performance of zigbee link.
2,
this method effectively can distinguish co-channel interference in various degree, and can the communication performance of zigbee link under comparison prediction disturbed condition.
3, the interference assessment of this method proposition,do not rely on positional information, adopt distributed algorithm, participate in without the need to other nodes.And the parameter of assessment can oneself customize, and meets different demand.
4 compare with traditional single-channel communication pattern, and the method, in the environment having co-channel interference, significantly can improve the communication performance of zigbee link.Especially, in specific interference environment, the method can reach 3 times of throughputs under single-channel mode.
Accompanying drawing explanation
Fig. 1 is that the signal working in 2.4GISM frequency range wireless system compares schematic diagram.
Fig. 2 is the distribution schematic diagram of wifi and zigbee channel in 2.4G frequency range.
Fig. 3 is the workflow schematic diagram of the first execution mode of the present invention.
Fig. 4 is the workflow schematic diagram of the second execution mode of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As shown in Figure 1, ISM2.4GHz frequency range comes into one's own day by day, and reason mainly contains: first it is a global frequency range, and the product of exploitation has global general-use; Secondly, the frequency range of its entirety is better than other ISM band, this provides for improved overall data transmission rate, allows coexistence of systems; 3rd is exactly size, and the volume of 2.4GHz radio and antenna is quite little, and small product size is also less.As shown in Figure 1, according to 802.11b standard, it launches frequency range is 22MHz, and requires outside distance center frequency 11MHz, and its signal attenuation need more than 30dB.But reality transmits for any, its energy is the process decayed gradually.Therefore produce frequency range overlap between the equipment such as 802.11b meeting and zigbee, Wireless USB, bluetooth and cordless telephone, will spectral interference be formed.
As shown in Figure 2, the bottom standard of Zigbee is divided into 16 channels the ISM band of 2.4GHz, and each channel width is 2MHz.This frequency range is divided into 11 DS channels by Wi-Fi, and system can be selected wherein arbitrary channel and communicate, and channel width is 22MHz, so 11 channels have overlap, non-overlapping channel only has at most 3.Obviously, assuming that Wi-Fi system works is at arbitrary channel, then the probability of Zigbee and its channel frequency overlap is 1/4.When Zigbee with Wi-Fi uses similar frequency bands to communicate simultaneously, coloured noise interference in generating strap, causes transmitting packet collisions.
Below in conjunction with concrete case, the present invention is further illustrated.
This wireless network comprises 4 zigbee nodes and 4 wifi nodes, wherein wifi disturbs speed to be 1Mb, node works on 4 channels and 9 channels (as Fig. 2), zigbee node available channel is restricted to 15 channels corresponding thereto and 20 channels, and is the channel seizure ratio u of cycle detection current operating channel with 10ms.
As shown in Figure 3, the first workflow of the present invention:
Embodiment:
1) threshold value setting: threshold value u
hget 25%;
2) interference detection: the channel seizure ratio u that node detects present channel exceedes setting threshold uh, represents that interference ratio is comparatively serious, then starts channel selection procedure;
3) Channel assignment: after Channel assignment starts, triggers the interference of present node to all available channels and assesses, and calculates interference prediction index < u, ν >,
First obtain the measured value of u=30% or ν=-37dBm by the interference density of many wheel detection operations channels or interference strength, be designated as X'
j, repetitive measurement obtains
Then process is weighted respectively by following formula:
X
n＝(1-α)*X
n-1+α*X'n≥2
Wherein, X' is the measured value of current obtained u or ν, X
nfor the value of u or ν after n exponent-weighted average, * is first derivative, and α is exponential weighting coefficient and value 0.125.
Obtain < u after final index weighted average, ν > to being <14% ,-33dBm>, as the index of interference prediction.
By the interference prediction index < u of each channel, ν > compares, channel for the purpose of the available channel selecting interference prediction index minimum; Comparison procedure is: compare channel seizure ratio u, chooses channel for the purpose of the minimum channel of channel seizure ratio u; If there is the available channel that channel seizure ratio u minimum value is identical, then the strength indicator ν of described available channel is compared, choose channel for the purpose of the minimum channel of wherein strength indicator ν.
As shown in Figure 4, the second workflow of the present invention:
1) threshold value setting: threshold value u
hget 50%;
2) interference detection: the channel seizure ratio u that node detects present channel exceedes setting threshold uh, represents that channel disturbance is very serious, then starts channel selection procedure;
3) Channel assignment: after Channel assignment starts, triggers the interference of present node to all available channels and assesses, and calculates interference prediction index < u, ν >,
Computational process is: first obtain the measured value of u=87% or ν=-10dBm by the interference density of many wheel detection operations channels or interference strength, be designated as X'
j, repetitive measurement obtains
Then process is weighted respectively by following formula:
X
n＝(1-α)*X
n-1+α*X'n≥2
Wherein, X' is the measured value of current obtained u or ν, X
nfor the value of u or ν after n exponent-weighted average, * is first derivative, and α is exponential weighting coefficient and value 0.125.
Obtain < u after final index weighted average, ν > to being <42% ,-19>, as the index of interference prediction.
Now channel is disturbed very serious, and channel minimum for interference prediction index in available channel is designated as best channel, and this channel disturbance prediction index is designated as < u
best, v
best >; Then present node traversal neighbor channel table, to the interference prediction index < u of each neighbor channel, ν > compares, channel minimum for interference prediction index in neighbor channel is designated as nbrbest channel, and this channel disturbance prediction index is designated as < u
nbrbest, v
nbrbest>; Last best channel and nbrbest channel compare, setting slack variable u
bestwith
if, u
nbrbestat [u
best, u
best+ 8%] between, and v
nbrbestat [v
best, v
best+ 10dBm] between, then select channel for the purpose of nbrbest channel, otherwise select channel for the purpose of best channel.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.
Claims (7)
1. one kind strengthens the method for Zigbee communication performance, it is characterized in that it is based on Zigbee node multichannel communication mode, with representing the channel seizure ratio u of interference density and representing that the strength indicator ν combination of interference strength represents the interference of working channel, and be denoted as interference prediction index < u, ν >; Setting threshold u
h, the channel seizure ratio u of node detecting periodically current operating channel; When the channel seizure ratio u detecting current operating channel exceeds threshold value u
htime, the whole available channel of node scan; To the interference prediction index < u of whole available channel, ν > compares, and selects the minimum available channel of interference prediction index and switch to this available channel to continue communication; The concrete steps of the method for described enhancing Zigbee communication performance are:
1) threshold value setting: threshold value u
hget [25%, 50%];
2) interference detection: the channel seizure ratio u of node detecting periodically current operating channel, if channel seizure ratio u exceedes setting threshold u
h, then channel selection procedure is started;
3) Channel assignment: after Channel assignment starts, trigger the interference of present node to all available channels to assess, calculate interference prediction index < u, ν >, by the interference prediction index < u of each channel, ν > compares, channel for the purpose of the available channel selecting interference prediction index minimum; Comparison procedure is: compare channel seizure ratio u, chooses channel for the purpose of the minimum channel of channel seizure ratio u; If there is the available channel that channel seizure ratio u minimum value is identical, then the strength indicator ν of described available channel is compared, choose channel for the purpose of the minimum channel of wherein strength indicator ν.
2. a kind of method strengthening Zigbee communication performance according to claim 1, is characterized in that described cycle T
rssi=10ms.
3. a kind of method strengthening Zigbee communication performance according to claim 1, is characterized in that described threshold value u
hbe 25%.
4. a kind of method strengthening Zigbee communication performance according to claim 1, it is characterized in that described channel selection procedure is: after Channel assignment starts, trigger the interference of present node to all available channels to assess, calculate the interference prediction index < u of each available channel, ν > also compares, channel minimum for interference prediction index in available channel is designated as best channel, and this channel disturbance prediction index is designated as < u
best, v
best>; Then present node traversal neighbor channel table, to the interference prediction index < υ of each neighbor channel, ν > compares, channel minimum for interference prediction index in neighbor channel is designated as nbrbest channel, and this channel disturbance prediction index is designated as < u
nbrbest, v
nbrbest>; Last best channel and nbrbest channel compare, setting slack variable u
bestwith
if u
nbrbest?
between, and v
nbrbest?
between, then select channel for the purpose of nbrbest channel, otherwise select channel for the purpose of best channel.
5. a kind of method strengthening Zigbee communication performance according to claim 4, described in is characterized in that
be 8%, described in
for 10dBm.
6. a kind of method strengthening Zigbee communication performance according to any one of claim 1 or 4, it is characterized in that described interference prediction index < u, the acquisition methods of ν > is, first obtain the measured value of u or ν by the interference density of many wheel detection operations channels or interference strength, be designated as X'
j, repetitive measurement obtains
Then process is weighted respectively by following formula:
X
n＝(1-α)*X
n-1+α*X'n≥2
Wherein, X' is the measured value of current obtained u or ν, X
nfor the value of u or ν after n exponent-weighted average, * is first derivative, and α is exponential weighting coefficient,
< u is obtained, ν > couple, as the index of interference prediction after final index weighted average.
7. a kind of method strengthening Zigbee communication performance according to claim 6, is characterized in that described weight coefficient α value 0.125.
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| CN105657715B (en) * | 2016-01-14 | 2019-04-09 | 珠海格力电器股份有限公司 | Method of allocating transmission channels and device |
| CN107222929B (en) * | 2017-06-09 | 2019-10-18 | 华南理工大学 | A method of it avoids interfering between wireless body area network |
| CN109462662A (en) * | 2018-12-20 | 2019-03-12 | 深圳市银河风云网络系统股份有限公司 | A kind of gateway, Internet of Things net equipment, Internet of things system and control method |
| CN110958737A (en) * | 2019-12-28 | 2020-04-03 | 上海唯视锐光电技术有限公司 | Wireless inspection system and inspection method for public lighting lamp |
| CN112218278A (en) * | 2020-09-29 | 2021-01-12 | 星络智能科技有限公司 | Zigbee channel selection method and switching system |
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