CN102546750A - Media access control (MAC) protocol method for wireless sensor network - Google Patents
Media access control (MAC) protocol method for wireless sensor network Download PDFInfo
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- CN102546750A CN102546750A CN2011103747357A CN201110374735A CN102546750A CN 102546750 A CN102546750 A CN 102546750A CN 2011103747357 A CN2011103747357 A CN 2011103747357A CN 201110374735 A CN201110374735 A CN 201110374735A CN 102546750 A CN102546750 A CN 102546750A
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Abstract
The invention discloses a media access control (MAC) protocol method for a wireless sensor network, which includes the following steps: step 1 a first interception time threshold of a wake cycle and a second interception time threshold of a wake cycle are set; step 2 a node timer starts a semi-wake-cycle of a node to enter interception time of the semi-wake-cycle and judges whether interception times of continuous non-activation events reach the first interception time threshold in the interception time of the semi-wake-cycle, and if the interception times reach the first interception time threshold, the semi-wake-cycle is prolonged by 1.5 times. The sensor MAC (S-MAC) protocol method reduces corresponding shifting degree of lower-layer network node moving time and upper-layer node moving time, node data transceiving of an upper layer and a lower layer can be responded timely, extension of a plurality of nodes enables data to be forwarded fast, and a delay problem caused by node dormancy in a traditional S-MAC protocol method is solved.
Description
Technical field
The invention belongs to the wireless sensor network data transmission field, particularly a kind of wireless sensor network MAC protocol method.
Background technology
The MAC agreement is the agreement how the definition of data frame transmits on medium, and it is arranged in OSI seven layer protocol data link layers, main control and the physical medium that is connected physical layer be responsible for.When sending data, the MAC agreement can judge whether to send data in advance, will add some control informations to data if can send, and data and control information send to physical layer with the form of regulation the most at last; When receiving data, the MAC agreement is at first judged the information of input and whether error of transmission is taken place, if there is not mistake, then removes control information and be sent to the LLC layer.
In the wireless senser field, the S-MAC protocol method is extensively adopted at present.This agreement adopts and periodically intercepts and sleep mechanism, and node sends data to adjacent node can only wait until that adjacent states are in when intercepting state.As shown in Figure 1, under the S-MAC protocol method, the period of state of node is divided into and wakes up half period and movable half period, 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 will be transmitted data; The network node 2 of lower floor possibly be in dormancy time; Data forwarding just must wait until that network node 2 is transformed into the Activity On the Node half period like this; This stand-by period, t caused data delay, and is this because the communication delay that the sensor network nodes dormancy brings can cause the very big reduction of network efficiency along with the proportional increase of the increase of jumping figure on the path.Therefore, existing S-MAC protocol method is only applicable to monitor the equipment that time delay can be grown the on-the-spot situation of reaction a little but still can be relatively actual a little, for requiring the higher equipment of monitoring network real-time may produce time-delay; Simultaneously, in one-period, the duty ratio of waking half period and movable half period up is with the adjustment of network traffics change dynamics, is suitable for using under the situation of high flow capacity, for causing energy dissipation under the low discharge situation, increases time delay.
Summary of the invention
The present invention is directed to the problem of the node data transmission delay of existing S-MAC protocol method existence, proposed a kind of wireless sensor network MAC protocol method.
This method may further comprise the steps:
Step 1: setting wake-up period first intercepts frequency threshold value and wake-up period second is intercepted frequency threshold value;
Step 2: the node timer starts the waking the half period up of node and gets into the time of intercept that wakes the half period up,
Judgement does not have intercepting number of times and whether reaching first of setting and intercept frequency threshold value of activation incident continuously in waking the time of intercept of half period up, be then will wake the half period up to prolong 1.5 times.
S-MAC protocol method of the present invention has reduced the corresponding degrees of offset of lower floor's network Activity On the Node time and upper layer node activity time; The transmitting-receiving of levels node data just can in time respond like this; The extension of a plurality of nodes just makes data transmit rapidly, has solved the delay issue that traditional S-MAC protocol method brings because of node dormancy.
Description of drawings
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 the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.
S-MAC protocol method of the present invention at first is dynamically to set the time of waking the half period up according to the node communication throughput, and this communication throughput is in order to weigh in preset time successful data quantity transmitted size between the transmitting-receiving node.This method specifically comprises the steps:
Step 1: setting wake-up period first intercepts frequency threshold value and wake-up period second is intercepted frequency threshold value;
Step 2: the node timer starts the waking the half period up of node and gets into the time of intercept that wakes the half period up; Judgement is in waking the time of intercept of half period up; Continuously no activation incident intercepts number of times and whether reaches first of setting and intercept frequency threshold value; Be then to wake 1.5 times of half period prolongations up, as shown in Figure 2.This activation incident can be RTS and CTS request msg package informatin, network conflict information, etc. pending data send confirmation etc.
In the step 2, waking up in the time of intercept of half period judging, not have intercepting number of times and whether reaching step that first of setting intercepts frequency threshold value simultaneously of activation incident continuously, 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 incident, is then will wake the half period up to reduce half the, as shown in Figure 3.
Secondly S-MAC protocol method of the present invention is to have changed node to wake the duty ratio of half period and movable half period up, specifically is before or after step 1, to comprise the steps:
Step 4: the node timer starts the movable half period of node.
Step 5: judging in the time of intercept of Activity On the Node half period, whether to receive the activation incident, is then to get into the activationary time processing time, transmitting-receiving activation incident corresponding data; Otherwise the communication module of closed node to shift to an earlier date the ending activity cycle, reaches the purpose that reduces energy loss, and is 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 the node communication throughput; Be specially adapted to the wireless sensor network of monitoring network environmental information; Like networks such as monitoring of environmental image, ambient temperature, ambient humidities, and information change such as electric power tower wireless sensor network slowly.
S-MAC protocol method of the present invention has reduced the corresponding degrees of offset of lower floor's network Activity On the Node time and upper layer node activity time; The transmitting-receiving of levels node data just can in time respond like this; The extension of a plurality of nodes just makes data transmit rapidly, has solved the delay issue that traditional S-MAC protocol method brings because of node dormancy.
The above; Be merely the preferable embodiment of the present invention; But protection scope of the present invention is not limited thereto; Any technical staff who is familiar with the present technique field is equal to replacement or change according to technical scheme of the present invention and inventive concept thereof in the technical scope that the present invention discloses, all should be encompassed within protection scope of the present invention.
Claims (4)
1. wireless sensor network MAC protocol method is characterized in that may further comprise the steps:
Step 1: setting wake-up period first intercepts frequency threshold value and wake-up period second is intercepted frequency threshold value;
Step 2: the node timer starts the waking the half period up of node and gets into the time of intercept that wakes the half period up; Judgement is in waking the time of intercept of half period up; Continuously the intercepting number of times and whether reach first of setting and intercept frequency threshold value of no activation incident is then to wake 1.5 times of half period prolongations up.
2. the method for claim 1 is characterized in that, in the step 2, is waking up in the time of intercept of half period judging, does not have intercepting number of times and whether reaching step that first of setting intercepts frequency threshold value simultaneously of activation incident continuously, 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 incident, is then will wake the half period up to reduce half the.
3. method as claimed in claim 2 is characterized in that, before or after step 1, comprises the steps:
Step 4: the node timer starts the movable half period of node;
Step 5: judging in the time of intercept of Activity On the Node half period, whether to receive the activation incident, is then to get into the activationary time processing time, transmitting-receiving activation incident corresponding data; Otherwise the communication module of closed node.
4. like each described method of claim 1 to 3, it is characterized in that, the activation incident be RTS and CTS request msg package informatin, network conflict information, etc. pending data send confirmation.
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| CN102892193A (en) * | 2012-09-20 | 2013-01-23 | 华为技术有限公司 | Method and equipment for transmitting data |
| 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 |
| TWI780779B (en) * | 2020-06-26 | 2022-10-11 | 日商三菱電機股份有限公司 | Comunication terminal, communication system, power saving control method and recording medium |
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| 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 |
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