CN102118824A - Radio communication anti-collision method based on received signal strength indicator (RSSI) - Google Patents
Radio communication anti-collision method based on received signal strength indicator (RSSI) Download PDFInfo
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- CN102118824A CN102118824A CN2011100076312A CN201110007631A CN102118824A CN 102118824 A CN102118824 A CN 102118824A CN 2011100076312 A CN2011100076312 A CN 2011100076312A CN 201110007631 A CN201110007631 A CN 201110007631A CN 102118824 A CN102118824 A CN 102118824A
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Abstract
The invention discloses a radio communication anti-collision method based on a received signal strength indicator (RSSI), which is characterized by comprising a step of judging whether equipment transmits a current channel according to an RSSI value by detecting the RSSI value of the channel so as to avoid interference collision in transmission. The radio communication anti-collision method based on the RSSI is simple in implementation without being built on the basis of a physical layer and without using the equipment having high cost and high energy consumption, so that collision interference between sent nodes and data can be avoided effectively, and the normal transmission of the data is further guaranteed.
Description
Technical field
The present invention relates to a kind of radio communication collision-proof method, be used to hide the method that node data sends collision in particularly a kind of wireless network based on RSSI.
Background technology
Radio sensing network has obtained swift and violent development since the concern that obtains theoretical and industrial quarters in recent years, and various new technologies about sensing network also enjoy attention.Rise wireless network along with the Internet of Things industry will obtain better development now.
The network node number all has hundreds and thousands of in the at present general application network, all be to use same space channel when node communication being arranged more, if so many node sends data at one time, certainly will cause the phase mutual interference, cause the recipient can't receive data.For fear of crosstalking of data transmit-receive between node, introduce rational anticollision machine and made the mode of necessary selection.
Traditional anticollision mode adopts frequency hopping communications mechanism or spread spectrum communication mechanism, these two kinds of mechanism all are based upon on the physical layer basis, if the physical layer of node does not have this function then can't realize anticollision, and there are characteristics such as cost height, power consumption be big in the equipment that contains this function.Therefore a lot of node devices have all adopted single-frequency point time division mechanism to come anticollision, and the foundation of time-division then generally adopts random number.Node generally also need use resources such as timer for producing this random number, but the random number discreteness that often produces is bad and efficient is lower, and node more for a long time the anticollision effect be not fine.
Summary of the invention
The objective of the invention is to, a kind of radio communication collision-proof method based on RSSI is provided.It need not to be based upon on the physical layer basis, can be under the situation of use cost height not, equipment that power consumption is big, and interferences that run foul of each other of effectively avoiding node data to send, thereby the normal transmission of assurance data.
Technical scheme of the present invention: a kind of radio communication collision-proof method based on RSSI is characterized in that: it is by detecting channel RSSI value, judges according to the RSSI value whether current channel has equipment in the interference hits of transmission when avoiding sending.
In the aforesaid radio communication collision-proof method based on RSSI, communication node is carrying out being introduced into accepting state to obtain the RSSI value in the current channel before data send, in the RSSI value during greater than default threshold values, be to have node sending data in the current channel, communication node selection etc. are to be sent to prevent collision.
Preceding described based in the RSSI collision-proof method, a node to a plurality of node communication states under, a plurality of be in the accepting state node and receive the information that sending node sends after, send a reply signal according to each accepting state node branch of the big young pathbreaker of RSSI value respectively at different time zone, be reduced in same time memory a plurality of nodes send simultaneously that data cause colliding may, the collision when avoiding multinode to reply.
Node anticollision process is introduced the RSSI value parameter, and this parameter is meant the received signal intensity that receiving node receives, and is node detected semaphore size under accepting state.This value can not only reflect the communication conditions of channel and can well reflect the positional information of each node with respect to sending node.
Utilize this value can make node pick out current channel transceiver situation problem fast, if node continues to detect RSSI value in the current channel greater than threshold values then show that present channel has equipment taking, then node can be selected to wait for and send to avoid collision, if detect current channel RSSI value less than threshold values, then illustrating in the current channel does not have hold facility, and node can normally use channel.When point-to-multipoint delivery, exist multiple spot to send data conditions,, cause receiving node can't collect correct data if do not have suitable mechanism can cause channel seriously to block this moment to single-point.The implementation that adopts the RSSI value to hide collision is, when data are mass-sended in single Centroid broadcasting, the many nodes that receive data are selected the time zone that oneself should send according to the RSSI value in-scope of reality, thereby the situation of avoiding many nodes to send in a time zone, so adopt regional selection mode owing to RSSI resolution is higher, promptly being chosen in two nodes between the RSSI threshold values is a time zone (time period) sending node.Because of having had the threshold values interval to be arranged so that to be in the interval node number of same RSSI value seldom, carry out effective anticollision processing for the mode that these nodes can adopt simple pseudorandom time-delay or further segment RSSI value interval.
Compared with prior art, the invention process is simple, need not to be based upon on the physical layer basis, need not use cost height, equipment that power consumption is big, interferences that run foul of each other that can effectively avoid node data to send, thereby the normal transmission of assurance data.
Description of drawings
Fig. 1 is an embodiments of the invention work schematic diagram.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples, but not as the foundation to the present invention's restriction.
Embodiment.A kind of radio communication collision-proof method based on RSSI is characterized in that: it is by detecting channel RSSI value, judges according to the RSSI value whether current channel has equipment in the interference hits of transmission when avoiding sending.Communication node is carrying out being introduced into before data send accepting state obtaining the RSSI value in the current channel, during greater than default threshold values, node is arranged in the transmission data in RSSI value in the promptly current channel, and communication node selection etc. are to be sent collides preventing.A node to a plurality of node communication states under, a plurality of be in the accepting state node and receive the information that sending node sends after, send a reply signal according to each accepting state node branch of the big young pathbreaker of RSSI value respectively at different time zone, be reduced in same time memory a plurality of nodes send simultaneously that data cause colliding may, the collision when avoiding multinode to reply.
As shown in Figure 1, node A represents the node of current transmission among the figure, and ball is represented node around it, and the signal field of the broken circle among the figure when representing that sending node sends, the dotted line radius of a circle just represents that RSSI value is big or small.
Signal field shown in the broken circle that sending node A produces when sending among the figure, wait node A to send broadcast data after, node just obtains a RSSI value that communicates with and has obtained a time synchronized value simultaneously around it.At this moment the threshold values interval selection that pre-sets according to its inside of each receiving node time zone that oneself should send.Node between signal field 1 to 3 is in same RSSI threshold values scope as shown in the figure, this moment, they can send data in time zone 1, node between signal field 3 to 6 also is in same RSSI threshold values scope, this moment, they can be time zone 2 in send data, and the like realize the time zone division of all nodes.Generally can make node number in each time zone in 10.So just, greatly reduce again same time memory a plurality of nodes send simultaneously that data cause colliding may.
Can realize hiding collision easily for the mode that channel RSSI before the simple pseudo-random algorithm+transmission of data source checks according to the RSSI value for node in same time zone.10 time slots will be divided into again in the same time zone, each time slot is the time of a node communication, each node calculates a random value by RSSI value and pseudo-random algorithm in time zone separately, the size of random value determines that in these 10 time slots which it is.Arrive the RSSI value that posterior nodal point detects current channel earlier at slot time, see if there is node, if if not then send then wait for that the free time sends again in transmission.Pseudo-random algorithm in this mode can be simple addition and subtraction, because the equipment number seldom and also have the differentiation of RSSI, therefore is not difficult to produce this random value, thereby is effectively hidden the collision under the identical RSSI value.
Claims (3)
1. radio communication collision-proof method based on RSSI is characterized in that: it is by detecting channel RSSI value, judges according to the RSSI value whether current channel has equipment in the interference hits of transmission when avoiding sending.
2. the radio communication collision-proof method based on RSSI according to claim 1, it is characterized in that: communication node is carrying out being introduced into accepting state to obtain the RSSI value in the current channel before data send, in the RSSI value during greater than default threshold values, be to have node sending data in the current channel, communication node selection etc. are to be sent to prevent collision.
3. according to claim 1 and 2 based on the RSSI collision-proof method, it is characterized in that: a node to a plurality of node communication states under, a plurality of be in the accepting state node and receive the information that sending node sends after, send a reply signal according to each accepting state node branch of the big young pathbreaker of RSSI value respectively at different time zone, be reduced in same time memory a plurality of nodes send simultaneously that data cause colliding may, the collision when avoiding multinode to reply.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102622564A (en) * | 2012-02-24 | 2012-08-01 | 上海海事大学 | Anti-collision method for identifying multiple radio frequency identification (RFID) tabs |
| CN103220698A (en) * | 2013-04-19 | 2013-07-24 | 江苏物联网研究发展中心 | Method, device and system based on wireless network for processing inter-node step out |
| CN104735715A (en) * | 2015-02-12 | 2015-06-24 | 中国科学技术大学苏州研究院 | Wireless multi-channel communication device and multi-channel real-time communication method |
| CN105676179A (en) * | 2016-01-26 | 2016-06-15 | 儒安科技有限公司 | 433MHz signal based indoor positioning method and system |
| CN108521675A (en) * | 2018-04-23 | 2018-09-11 | 浙江摩根智能技术有限公司 | A kind of low-consumption wireless collision-proof method |
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| CN104735715B (en) * | 2015-02-12 | 2018-08-03 | 中国科学技术大学苏州研究院 | Wireless Multi-Channel communication device and multi channel real-time communication method |
| CN105676179A (en) * | 2016-01-26 | 2016-06-15 | 儒安科技有限公司 | 433MHz signal based indoor positioning method and system |
| CN108521675A (en) * | 2018-04-23 | 2018-09-11 | 浙江摩根智能技术有限公司 | A kind of low-consumption wireless collision-proof method |
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Application publication date: 20110706 |