CN108112086A - Interactive channels communication means - Google Patents
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- CN108112086A CN108112086A CN201711217343.3A CN201711217343A CN108112086A CN 108112086 A CN108112086 A CN 108112086A CN 201711217343 A CN201711217343 A CN 201711217343A CN 108112086 A CN108112086 A CN 108112086A
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- 230000002452 interceptive effect Effects 0.000 title claims abstract description 24
- 238000004891 communication Methods 0.000 title claims description 10
- 238000013459 approach Methods 0.000 claims abstract description 18
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- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 abstract description 13
- 230000035945 sensitivity Effects 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 4
- 230000003993 interaction Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 14
- 238000002955 isolation Methods 0.000 description 6
- 238000012790 confirmation Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
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- 238000012545 processing Methods 0.000 description 2
- 241001269238 Data Species 0.000 description 1
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- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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Abstract
The invention discloses a kind of interactive channels coordination approach, wherein, including：Zigbee module sends the channel request with data priority to WiFi module；WiFi module compares the data priority of itself and Zigbee；If the data priority of Zigbee is high, WiFi module buffer delay WiFi transmittings；In the buffer delay period, Zigbee module carries out data transmit-receive.The present invention's designs interaction mechanism between WiFi and Zigbee, coordinates WiFi and Zigbee signal transmitting and receivings, reduces the signal interference between two kinds of radio-frequency modules, reduces number of retransmissions, improves Zigbee receiving sensitivities, reduces data packetloss rate, improves user experience.
Description
Technical field
The present invention relates to a kind of communication means more particularly to a kind of interactive letters for avoiding WiFi and Zigbee channel disturbances
Road coordinating communication method.
Background technology
China has more than 400,000,000 family families, and the market prospects of smart home industry are boundless, and smart home conduct
One application platform, can derive countless business demands, and just like PC and mobile phone, market potential is huge.
The smart home agreement of mainstream has Zigbee, Z-Wave, Lora etc. currently on the market, and wherein Zigbee is due to tool
It has the advantage that, obtains more and more producers and support：
1. low-power consumption：Under low power consumption standby mode, 2 No. 5 dry cells of section can support 1 node to work 6-24 months, very
It is extremely longer.
2. low cost：Patent is free, the requirement to communication controler is reduced by significantly simplified agreement, so as to reduce into
This.
3. short time-delay：The response speed of ZigBee is very fast, and being generally transferred to working condition from sleep only needs 15ms, node connection
30ms is only needed into network.
4. high power capacity：Starlike, sheet and mesh network topology can be used in ZigBee, and a host node can manage 254 sons
Node can at most form the big net of 65000 nodes.
The core equipment of intelligent domestic system is intelligent domestic gateway, and intelligent domestic gateway passes through smart home agreement (ratio
Such as Zigbee) connection smart home sensor, it is then connected by WiFi with control terminal, so as to fulfill intelligent domestic system
The functions such as information gathering, remote control, centralized management.In use, the greatest problem run into is WiFi 802.11b/g/
N and Zigbee is operated in 2.4G ISM bands, when two kinds of radio frequencies work at the same time, can interfere with each other, and reduces product radio frequency
Performance.And intelligent domestic gateway product has following trend, it is intended to increase WiFi power, for increasing transmission range；Video
Transmission increases, and data volume increase causes WiFi signal duty cycle to improve；Small product size is less and less.These trend cause interference to ask
Topic is serious increasingly.
In order to improve interference free performance, WiFi and Zigbee collision detection and re-transmission are designed in each different levels
Mechanism.Existing solution is typically the solution jamming program of non-interactive type, low bandwidth, low-power, physical isolation property compared with
When good, WiFi and Zigbee performances will not significantly reduce.Concrete methods of realizing has following several：
1. it is separated as far as possible in frequency
It is less than adjacent channel away from channel disturbance, adjacent channel is less than same channel, and when same channel serious interference can lead
Cause data jamming.WiFi AP are established can as far as possible separate WiFi channels and Zigbee channels with during Initial Channel Assignment, reaches and subtracts
The purpose disturbed less.
2. WiFi is allowed to be operated under 20MHz bandwidth
802.11n uses OFDM carrier waves, can be operated under 20MHz 40MHz patterns, if using 40M, adjacent letter
The interference that road receives can be higher than under 20M pattern, when channel is established, can set HT capabilities information,
WiFi is forced to be operated in 20MHz patterns.
3. increase isolation between antennas
In the case where same intensity signal source is disturbed, by increasing isolation between antennas, interference effect can be reduced.It can be with
Isolation between antennas is increased by two ways
1) the distance between antenna is increased
2) antenna directivity is strengthened
4. utilize Zigbee retransmission mechanism
802.15.4 specification defines the mechanism retransmitted in MAC layer, in order to better improve transmission robustness, can be with
Increase retransmission mechanism in application layer.
5. close FEM LAN
Enabled FEM LAN can improve receiving sensitivity, but under strong WiFi environment, enabled FEM LAN can reduce defeated
Enter signal-to-noise ratio, receiving sensitivity can be allowed to reduce instead, in order to improve receiving sensitivity, FEM LAN can be allowed to be operated in bypass
Under pattern.
The scheme for solving channel disturbance existing at present is primarily present the deficiency of following three aspect：
1. in order to increase isolation between antennas, it is necessary to increase the distance between antenna, cause product that can not minimize.In addition change
Become antenna directivity, also easily change signal distributions, influence signal range of receiving.
2. simply the module working time can be increased using retransmission mechanism, greatly reduce the sensor battery service life, increase and use
Cost and maintenance cost.
3. number of retransmissions, which excessively also results in data transmit-receive delay, to be increased, response speed is slack-off, influences user experience.
2.4G ISM bands belong to the frequency range freely used in most of country, are mainly used for industry, medical treatment and science
Research.Many wireless communication standards all concentrate on common WiFi, Zigbee association in the frequency range, such as smart home product at present
View.IEEE 802.1b/g/nWiFi support the channel of 14 20/22M bandwidth in 2.4G frequency ranges.IEEE 802.15.4Zigbee
The 2M channels of 16 non-overlapping copies are supported in 2.4G frequency ranges.In use, when two kinds of radio frequency units work at the same time, by
In channel is close or overlapping, it can interfere with each other between signal, reduce respective radio-frequency performance.
Therefore, in order to improve the properties of product of intelligent domestic gateway, a kind of channel coordination communication mechanism is devised, is coordinated
The signal transmitting and receiving of WiFi and Zigbee avoids interfering with each other between the two, can significantly improve receiving sensitivity.
The content of the invention
The above-mentioned purpose of the present invention is achieved through the following technical solutions：
A kind of interactive channels coordination approach, wherein, including：Zigbee module is sent to WiFi module with high priority data
The channel request of grade, WiFi module compare the data priority of itself and Zigbee, if the data priority of Zigbee is high,
WiFi module buffer delay WiFi emits, and in the buffer delay period, Zigbee module carries out data transmit-receive.
Interactive channels coordination approach as described above, wherein, Zigbee module is led to WiFi module by three GPIO
Letter：Data priority, channel request, channel allow.
Interactive channels coordination approach as described above, wherein, progress idle channel is commented before Zigbee module sends data
Estimate, Zigbee module enables channel request before clear channel assessment (CCA) completion, and Zigbee module makes after enabled channel request
It can data priority；After WiFi module obtains Zigbee module channel request, WiFi module compares the data of itself and Zigbee
Priority, if the data priority of Zigbee is high, enabling channel allows, buffer delay WiFi transmittings.
Interactive channels coordination approach as described above, wherein, Zigbee module completes clear channel assessment (CCA), if received
Signal strength instruction less than clear channel assessment (CCA) thresholding, and channel allows to enable, then Zigbee module transmitting data；Zigbee
When module emits data, power amplifier and low noise amplifier are switched to emission mode, Zigbee module transmitting data from reception pattern
Data priority is closed after finishing, power amplifier and low noise amplifier are switched to reception pattern by closing channel request from emission mode,
Etc. character to be confirmed until time-out.
Interactive channels coordination approach as described above, wherein, if it is confirmed that character waits time-out, channel to allow not make
Energy, signal strength happen any one higher than three kinds of clear channel assessment (CCA) thresholding, then perform retransmission mechanism.
Interactive channels coordination approach as described above, wherein, it further includes Zigbee and receives data method, Zigbee module
Effective data packets are received, enable channel request, enable data priority；Zigbee module checks that data packet addressed is this equipment
Address, if met simultaneously：The cyclic redundancy check code of data packet does not have mistake, and data packet requirement, which is replied, confirms character, letter
Road allows to enable these three conditions, then Zigbee module, which is sent, confirms character, and otherwise, Zigbee module does not send confirmation character.
Interactive channels coordination approach as described above, wherein, Zigbee module checks data packet addressed, if not this
Data priority, closing channel request are then closed in the address of equipment.
Interactive channels coordination approach as described above, wherein, closing data are excellent after Zigbee module sends confirmation character
First grade, closing channel request.
In conclusion by adopting the above-described technical solution, the present invention to solve WiFi and Zigbee in the prior art same
When the problem of interfering with each other when working, communicated by Zigbee module with WiFi module, Zigbee module is to WiFi module
Channel request of the transmission with priority, WiFi module judges priority, and is made whether the action of buffer operation accordingly, simultaneously
Whether feedback notification Zigbee module is received and dispatched.The method of the present invention designs interaction mechanism between WiFi and Zigbee, assists
WiFi and Zigbee signal transmitting and receivings are adjusted, reduce the signal interference between two kinds of radio-frequency modules, reduce number of retransmissions, improve Zigbee
Receiving sensitivity reduces data packetloss rate, improves user experience.
Specific embodiment
The present invention is described further below：
A kind of interactive channels coordination approach, wherein, including：Zigbee module is sent to WiFi module with high priority data
The channel request of grade, WiFi module compare the data priority of itself and Zigbee, if the data priority of Zigbee is high,
WiFi module buffer delay WiFi emits, and in the buffer delay period, Zigbee module carries out data transmit-receive.
Further, Zigbee module is communicated with WiFi module by three GPIO：Data priority, channel request, letter
Road allows.
Further, Zigbee module carries out clear channel assessment (CCA) before sending data, and Zigbee module is commented in idle channel
Enabled channel request before estimating completion, Zigbee module enable data priority after enabled channel request；WiFi module obtains
After Zigbee module channel request, WiFi module compares the data priority of itself and Zigbee, if the data of Zigbee are excellent
First grade is high, then enabling channel allows, buffer delay WiFi transmittings.
Further, Zigbee module completes clear channel assessment (CCA), if the instruction of received signal intensity is less than idle letter
Thresholding is assessed in road, and channel allows to enable, then Zigbee module transmitting data；When Zigbee module emits data, by power amplifier and
Low noise amplifier is switched to emission mode from reception pattern, closes data priority after the completion of Zigbee module transmitting data, closes
Channel request is closed, power amplifier and low noise amplifier are switched to reception pattern from emission mode, waits character to be confirmed until time-out.
Further, if it is confirmed that character waits, time-out, channel allow not enable, signal strength is higher than clear channel assessment (CCA)
Three kinds of thresholding happens any one, then performs retransmission mechanism.
Further, further include Zigbee and receive data method, Zigbee module receives effective data packets, enables channel
Request enables data priority；Zigbee module checks that data packet addressed is this device address, if met simultaneously：Data packet
Cyclic redundancy check code there is no mistake, data packet requirement, which is replied, confirms character, and channel allows to enable these three conditions, then
Zigbee module, which is sent, confirms character, and otherwise, Zigbee module does not send confirmation character.
Further, Zigbee module checks data packet addressed, if not the address of this equipment, then closes high priority data
Grade, closing channel request.
Further, Zigbee module closes data priority, closing channel request after sending confirmation character.
In the specific implementation process of the present invention, it may be employed while integrate the circuit board of WiFi and Zigbee functions,
In, WiFi chip uses 88W8997, and Zigbee chips use EFR32MG1.In specific implementation process, the data volume of WiFi
With bandwidth much larger than Zigbee data volumes and bandwidth, and Zigbee is typically to carry out transceiving data by second grade, so leading here
Consider influences of the WiFi to Zigbee.
Further, the present invention has been applied to AMS4 intelligent domestic gateways, WiFi and Zigbee and passes through three GPIO
It communicates, can also be communicated using other bus interface, such as UART, it can also be realized by different command interactions
Same control logic.
In order to obtain relevant data in the application, following test has specifically been carried out：WiFi is arranged to 100%
Duty-cyle, 802.11n (MCS3,20MHz bandwidth) pattern emits signal as interference source using different transmission power.Zigbee
In same channel, adjacent channel, away from sending and receiving signals test on channel.
Influences of the WiFi to Zigbee obtains drawing a conclusion：
1. same channel：
1) EFR32MG1Zigbee modules most multipotency receives the signal of 6dB lower than WiFi.
2) when the WiFi signal power received reaches -75dBm, because Clear Channel Assessment thresholdings
Influence, Zigbee can stop sending.
2. adjacent channel
When the WiFi signal received reaches -35dBm, Zigbee can not receive the signal below -80dBm.
3. away from channel
When the WiFi signal received reaches -15dBm, Zigbee can not receive the signal below -80dBm.
4. in real environment, WiFi can not reach 100% duty cycle, only in low snr environments, carry out file
Or it is only possible to reach 100% duty cycle during transmission of video.When WiFi is closed, Zigbee receiving sensitivities can rise, when
Zigbee receiving sensitivities can decline when WiFi is opened.
In the specific embodiment of the present invention, communicated between WiFi and Zigbee by 3 GPIO, three GPIO
It is PRIORITY (data priority) respectively, REQUEST (channel request), GRANT (channel permission), meaning is as follows：
PRIORITY：Zigbee is exported, and represents the priority of Zigbee data.REQUEST：Zigbee is exported, and represents Zigbee requests
Use 2.4G frequency ranges.GRANT：WiFi is exported, and after WiFi receives the REQUEST signal interruptions of Zigbee, reads PRIORITY, so
The data priority of heel oneself is compared, to decide whether to allow Zigbee transceiving datas.
Specifically, Zigbee clear channel assessment (CCA)s (Clear Channel Assessment, CCA) include：Judge channel
It is whether idle.IEEE 802.15.4 physical layers provide the ability of CCA in collision-avoidance mechanism, i.e., if channel is set by other
Communication protocol standby to occupy, then that transmission is allowed to exit without being considered as the channel.Now mainly there are 3 kinds of clear channel assessment (CCA) moulds
Formula：
1) signal energy of channel is judged, if signal energy is less than some threshold amount, then it is assumed that channel idle.
2) feature of wireless channel is judged, this feature mainly includes two aspects, i.e. spread-spectrum signal and carrier frequency.
3) comprehensive first two pattern, while signal strength and signal characteristic are detected, provide channel idle judgement.
Specifically, the re-transmission of Zigbee data includes：
802.15.4 agreement MAC layer defines three kinds of frame types, command frame, data frame, acknowledgement frame.Command frame is by MAC
Layer is initiated.In ZigBee-network, in order to which the working condition to equipment controls, led to the other equipment in network
Letter, MAC layer will generate corresponding command frame according to command type.Data frame is initiated by application layer, ZigBee equipment ask into
When row data transmission, the data to be transmitted are generated by application layer, and MAC layer is sent to after successively data processing, are formed
MAC data frame.Acknowledgement frame is initiated by media access control sublayer.In order to ensure the reliability for asking communication of equipment, sending device, which usually requires that, to be connect
Receipts are set respectively returns to an acknowledgement frame after correct frame information is received, and represents correctly received to sending device.Zigbee
When transmission data are unsuccessful, retransmission mechanism can be enabled, and this retransmission mechanism is divided into：MAC is retransmitted, and APSC is retransmitted, NWK
It retransmits, and APSC and NWK repeating transmission is premised on receiving MAC ACK, otherwise will not be retransmitted.
According to test, in order to obtain better performance, it is necessary to pay attention at following 2 points.
1.WiFi needs to support TX Pre-emption
After REQUEST is enabled, if WiFi equipment does not support TX, Pre-emption, WiFi will not enable GRANT, directly
The bag being presently processing to completion.WiFi is in the case of MCS0 20MHz, if sending big bag, this delay can arrive
It is the 200us before CCA completions that 16ms, REQUEST, which are enabled, this delay greatly exceeds the time.This can cause Zigbee
Packet loss quantity and number of retransmissions increase.If WiFi equipment supports TX pre-emption, WiFi that can stop WiFi transmission, close
WiFi PA are closed, quickly enabled GRANT signals, improve the probability of Zigbee first time transmission success, reduce number of retransmissions.
WiFi TX Pre-emption can cause WiFi TX data sendings fail, may result in WiFi equipment be switched to it is lower
MCS, the high MCS of switchback again in subsequent transmission process.This has WiFi performances certain influence, but due to Zigbee signals
Duty cycle is very low, influences to be not obvious.
2.Zigbee packet priorities are set
Zigbee received data packets are asynchronous, and lost data packets can cause to retransmit, and increase message delay, reduce the battery longevity
Life, so Zigbee receptions should be arranged to high priority as far as possible.Zigbee send data when because this product WiFi and
Zigbee is integrated on one piece of plank, and is connected on same MCU, and control is more convenient, and the product is that power supply supplies
Electricity, in principle Zigbee transmittings can be set to low priority, but if application scenarios are very high to delay requirement, for example connection is controlled
The Zigbee sensors of device processed etc, Zigbee transmittings also need to be set to high priority.
In conclusion by adopting the above-described technical solution, the present invention compared to the prior art, achieve it is following positive
Effect：
1. reducing the requirement to WiFi and Zigbee isolation between antennas, small product size limitation is reduced, design is more flexible,
It is easy to implement product miniaturization.The requirement to antenna directivity is reduced simultaneously, is avoided the somewhat complex design of antenna, is improved antenna
Radiation efficiency adds the scope of signal reception.
2. greatly reducing the number of Zigbee data re-transmission, reduce the working time of Zigbee sensors, carry at double
High battery reduces sensor use cost and maintenance cost.
3. since number of retransmissions reduces, Zigbee data transmission periods shorten, and sensor response is timely, optimize user behaviour
It experiences.
Claims (8)
1. a kind of interactive channels coordination approach, which is characterized in that including：Zigbee module is sent to WiFi module with data
The channel request of priority, WiFi module compare the data priority of itself and Zigbee, if the data priority of Zigbee
Height, then WiFi module buffer delay WiFi transmittings, in the buffer delay period, Zigbee module carries out data transmit-receive.
2. interactive channels coordination approach according to claim 1, which is characterized in that Zigbee module is led to WiFi module
Cross three GPIO communications：Data priority, channel request, channel allow.
3. interactive channels coordination approach according to claim 2, which is characterized in that Zigbee module sends data and advances
Row clear channel assessment (CCA), Zigbee module enable channel request before clear channel assessment (CCA) completion, and Zigbee module is enabled
Data priority is enabled after channel request；WiFi module obtain Zigbee module channel request after, WiFi module compare itself with
The data priority of Zigbee, if the data priority of Zigbee is high, enabling channel allows, buffer delay WiFi transmittings.
4. interactive channels coordination approach according to claim 3, which is characterized in that Zigbee module completes idle channel
Assessment, if the instruction of received signal intensity is less than clear channel assessment (CCA) thresholding, and channel allows to enable, then Zigbee module is sent out
Penetrate data；When Zigbee module emits data, power amplifier and low noise amplifier are switched to emission mode, Zigbee from reception pattern
Data priority is closed after the completion of module transmitting data, closing channel request cuts power amplifier and low noise amplifier from emission mode
Reception pattern is changed to, waits character to be confirmed until time-out.
5. interactive channels coordination approach according to claim 4, which is characterized in that if it is confirmed that character wait time-out,
Channel allows not enable, signal strength happens any one higher than three kinds of clear channel assessment (CCA) thresholding, then performs re-transmission machine
System.
6. interactive channels coordination approach according to claim 2, which is characterized in that further include Zigbee and receive data side
Method, Zigbee module receive effective data packets, enable channel request, enable data priority；Zigbee module checks data
Packet address is this device address, if met simultaneously：The cyclic redundancy check code of data packet does not have mistake, which requires back
Character is confirmed again, and channel allows to enable these three conditions, then Zigbee module, which is sent, confirms character, and otherwise, Zigbee module is not
It sends and confirms character.
7. interactive channels coordination approach according to claim 6, which is characterized in that Zigbee module is with checking data packet
Data priority, closing channel request if not the address of this equipment, are then closed in location.
8. interactive channels coordination approach according to claim 6, which is characterized in that Zigbee module, which is sent, confirms character
After close data priority, closing channel request.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108184221A (en) * | 2017-12-26 | 2018-06-19 | 温州力沃电器有限公司 | A kind of compound exchange method of zigbee node controls data |
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| CN111294967A (en) * | 2018-12-07 | 2020-06-16 | 中兴通讯股份有限公司 | Network anti-interference method and device and computer readable storage medium |
| CN110278577A (en) * | 2019-06-05 | 2019-09-24 | 青岛海信智慧家居系统股份有限公司 | The sending control method and device of data |
| CN110278577B (en) * | 2019-06-05 | 2022-06-14 | 青岛海信智慧家居系统股份有限公司 | Data transmission control method and device |
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