CN102546750B - A kind of MAC protocol for wireless sensor networks method - Google Patents
A kind of MAC protocol for wireless sensor networks method Download PDFInfo
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- CN102546750B CN102546750B CN201110374735.7A CN201110374735A CN102546750B CN 102546750 B CN102546750 B CN 102546750B CN 201110374735 A CN201110374735 A CN 201110374735A CN 102546750 B CN102546750 B CN 102546750B
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Abstract
The invention discloses a kind of MAC protocol for wireless sensor networks method, comprise the following steps: step one: setting wake-up period first intercepts frequency threshold value and wake-up period second intercepts frequency threshold value; Step 2: the waking the half period up and enter the time of intercept waking the half period up of node timer starter node, judge in the time of intercept waking the half period up, continuous intercepting number of times and whether reach first of setting and intercept frequency threshold value without the event of activation, is, will wake the half period up to extend 1.5 times.S-MAC protocol method of the present invention reduces the corresponding degrees of offset of lower floor's network Activity On the Node time and upper layer node activity time, such levels node data transmitting-receiving just can respond in time, the extension of multiple node just makes data forward rapidly, solves the delay issue that traditional S-MAC protocol method brings because of node dormancy.
Description
Technical field
The invention belongs to wireless sensor network data transmission field, particularly a kind of MAC protocol for wireless sensor networks method.
Background technology
MAC protocol defines the agreement how Frame carry out transmitting on medium, and it is arranged in OSI seven layer protocol data link layer, and primary responsibility controls and the physical medium being connected physical layer.When transmission data, MAC protocol can judge whether to send data in advance, will add some control informations if can send to data, and data and control information are sent to physical layer with the form of regulation the most at last; When reception data, first MAC protocol judges whether the information inputted also error of transmission occurs, if do not have mistake, then removes control information and is sent to LLC layer.
At present in wireless senser field, S-MAC protocol method is widely adopted.This agreement adopts and periodically intercepts and sleep mechanism, node to adjacent node send data can only wait until adjacent states be in intercept state time.As shown in Figure 1, under S-MAC protocol method, the period of state of node is divided into and wakes half period and movable half period up, wakes the half period up to comprise time of intercept and dormancy time, and the movable half period comprises time of intercept and activates the event handling time; When forward node 1 wants forwarding data, the network node 2 of lower floor may be in dormancy time, such data retransmission just must wait until that network node 2 is transformed into the Activity On the Node half period, this stand-by period, t caused data delay, this communication delay brought due to sensor network nodes dormancy along with the proportional increase of the increase of jumping figure on path, can cause the very big reduction of network efficiency.Therefore, existing S-MAC protocol method be only applicable to monitor time delay can more grow a little but still can be actual the equipment of situation at reaction scene, for requiring that the higher equipment of monitoring network real-time may produce time delay; Meanwhile, in one-period, the duty ratio waking half period and movable half period up, not with the adjustment of network traffics change tread, uses when being suitable for high flow capacity, may cause energy dissipation under low flow condition, increase time delay.
Summary of the invention
The present invention is directed to the problem of the node data transmission delay that existing S-MAC protocol method exists, propose a kind of MAC protocol for wireless sensor networks method.
The method comprises the following steps:
Step one: setting wake-up period first intercepts frequency threshold value and wake-up period second intercepts frequency threshold value;
Step 2: the waking the half period up and enter the time of intercept waking the half period up of node timer starter node,
Judge in the time of intercept waking the half period up, intercepting number of times and whether reach first of setting and intercept frequency threshold value continuously without the event of activation, is, will wake the half period up to extend 1.5 times.
S-MAC protocol method of the present invention reduces the corresponding degrees of offset of lower floor's network Activity On the Node time and upper layer node activity time, such levels node data transmitting-receiving just can respond in time, the extension of multiple node just makes data forward rapidly, solves the delay issue that traditional S-MAC protocol method brings because of node dormancy.
Accompanying drawing explanation
Fig. 1 is the period of state sequential chart of the node of existing S-MAC protocol method.
Fig. 2 is a kind of period of state sequential chart of the node of S-MAC protocol method of the present invention.
Fig. 3 is the another kind of period of state sequential chart of the node of S-MAC protocol method of the present invention.
Fig. 4 is another period of state sequential chart of the node of S-MAC protocol method of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.
First S-MAC protocol method of the present invention is dynamically set the time of waking the half period up according to node communication throughput, and this communication throughput is in order to weigh within preset time, the data volume size of Successful transmissions between transmitting-receiving node.The method specifically comprises the steps:
Step one: setting wake-up period first intercepts frequency threshold value and wake-up period second intercepts frequency threshold value;
Step 2: the waking the half period up and enter the time of intercept waking the half period up of node timer starter node, judge in the time of intercept waking the half period up, continuous intercepting number of times and whether reach first of setting and intercept frequency threshold value without the event of activation, that will wake the half period up extends 1.5 times, as shown in Figure 2.This activation event can be RTS and CTS request msg package informatin, network conflict information, etc. pending data send confirmation etc.
In step 2, judging in the time of intercept waking the half period up, intercepting number of times and whether reach first of setting and intercept the step of frequency threshold value simultaneously continuously without the event of activation, can also comprise the steps:
Step 3: judging all to listen to intercepting number of times and whether reaching wake-up period second and intercept frequency threshold value of activation event, is will wake half period reduction half up, as shown in Figure 3.
Secondly S-MAC protocol method of the present invention is the duty ratio changing waking up nodes half period and movable half period, specifically comprises the steps: before or after step one
Step 4: the movable half period of node timer starter node.
Step 5: judging whether receive activation event in the time of intercept of Activity On the Node half period, is enter the activationary time processing time, transmitting-receiving activation event corresponding data; Otherwise the communication module of closed node, to shift to an earlier date the ending activity cycle, reaches the object reducing energy loss, as shown in Figure 4.
S-MAC protocol method of the present invention dynamically sets the time of waking the half period up according to node communication throughput, be specially adapted to the wireless sensor network of monitoring network environmental information, as networks such as monitoring of environmental image, ambient temperature, ambient humidities, and the information change wireless sensor network slowly such as power tower.
S-MAC protocol method of the present invention reduces the corresponding degrees of offset of lower floor's network Activity On the Node time and upper layer node activity time, such levels node data transmitting-receiving just can respond in time, the extension of multiple node just makes data forward rapidly, solves the delay issue that traditional S-MAC protocol method brings because of node dormancy.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (2)
1. a MAC protocol for wireless sensor networks method, is characterized in that comprising the following steps:
Step one: setting wake-up period first intercepts frequency threshold value and wake-up period second intercepts frequency threshold value;
Step 2: the waking the half period up and enter the time of intercept waking the half period up of node timer starter node, judge in the time of intercept waking the half period up, continuous intercepting number of times and whether reach first of setting and intercept frequency threshold value without the event of activation, is, will wake the half period up to extend 1.5 times;
In step 2, judging in the time of intercept waking the half period up, intercepting number of times and whether reach first of setting and intercept the step of frequency threshold value simultaneously continuously without the event of activation, also comprises the steps:
Step 3: judging all to listen to intercepting number of times and whether reaching wake-up period second and intercept frequency threshold value of activation event, is will wake half period reduction half up;
Before step one, also there are following steps: dynamically set the time of waking the half period up according to node communication throughput, this communication throughput in order to weigh within preset time, the data volume size of Successful transmissions between transmitting-receiving node;
Before or after step one, comprise the steps: that concept transfer wakes the duty ratio of half period and movable half period up, be specially:
Step 4: the movable half period of node timer starter node;
Step 5: judging whether receive activation event in the time of intercept of Activity On the Node half period, is enter the activationary time processing time, transmitting-receiving activation event corresponding data; Otherwise the communication module of closed node.
2. the method for claim 1, is characterized in that, activation event be RTS and CTS request msg package informatin, network conflict information, etc. pending data send confirmation.
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| CN102892193B (en) * | 2012-09-20 | 2016-03-30 | 华为技术有限公司 | Data transmission method and equipment |
| CN104284401A (en) * | 2013-07-05 | 2015-01-14 | 华为技术有限公司 | Method and device for reducing power consumption of LowMAC layer and terminal |
| CN115769595A (en) * | 2020-06-26 | 2023-03-07 | 三菱电机株式会社 | Communication terminal, communication system, power saving control method, and power saving control program |
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| CN101035129A (en) * | 2007-01-11 | 2007-09-12 | 上海交通大学 | Traffic-adapted radio sensor network channel access control method |
| CN101087220A (en) * | 2006-06-09 | 2007-12-12 | 中国科学院软件研究所 | Dormancy monitoring method for MAC layer of wireless sensor network |
| CN101122945A (en) * | 2006-08-11 | 2008-02-13 | 香港中文大学 | RFID system and method for operating the system under energy-saving mode |
| CN101282335A (en) * | 2008-05-20 | 2008-10-08 | 浙江大学宁波理工学院 | Method for snooping and sleeping low-load wireless sensor network MAC layer |
| CN101557408A (en) * | 2008-04-11 | 2009-10-14 | 中国人民解放军信息工程大学 | Wireless sensor network active mode resting dispatching method |
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Patent Citations (5)
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| CN101087220A (en) * | 2006-06-09 | 2007-12-12 | 中国科学院软件研究所 | Dormancy monitoring method for MAC layer of wireless sensor network |
| CN101122945A (en) * | 2006-08-11 | 2008-02-13 | 香港中文大学 | RFID system and method for operating the system under energy-saving mode |
| CN101035129A (en) * | 2007-01-11 | 2007-09-12 | 上海交通大学 | Traffic-adapted radio sensor network channel access control method |
| CN101557408A (en) * | 2008-04-11 | 2009-10-14 | 中国人民解放军信息工程大学 | Wireless sensor network active mode resting dispatching method |
| CN101282335A (en) * | 2008-05-20 | 2008-10-08 | 浙江大学宁波理工学院 | Method for snooping and sleeping low-load wireless sensor network MAC layer |
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