CN103379549A - Data transmission method, system and device in wireless network - Google Patents

Data transmission method, system and device in wireless network Download PDF

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Publication number
CN103379549A
CN103379549A CN2012101190396A CN201210119039A CN103379549A CN 103379549 A CN103379549 A CN 103379549A CN 2012101190396 A CN2012101190396 A CN 2012101190396A CN 201210119039 A CN201210119039 A CN 201210119039A CN 103379549 A CN103379549 A CN 103379549A
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website
receiving station
frame
station
adjacent bus
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CN103379549B (en
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刘谦雷
鲍东山
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Beijing Nufront Mobile Multimedia Technology Co Ltd
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Beijing Nufront Mobile Multimedia Technology Co Ltd
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Abstract

The invention discloses a data transmission method, system and device in a wireless network. The method comprises the steps that when data frames to be sent exist in a site in the wireless network, if the site in the wireless network is adjacent to a first receiving site which receives data, the maximum transmitting power capable of being used by the site is determined, and the data frames are sent to a target site through transmitting power which is not larger than the maximum usable transmitting power according to the acceptable interference level of an adjacent site of the first receiving site and the path consumption between the site and the first receiving site, and / or if the site in the wireless network is adjacent to a second receiving site which sends data, the data frames are transmitted to the target site within the time interval when the data frames are sent by the second transmitting site. Through the data transmission method, system and device in the wireless network, idle channel resources can be fully used for data transmission, and channel use ratio is improved.

Description

Data transmission method in a kind of wireless network, system and device
Technical field
The invention belongs to wireless communication technology field, relate in particular to data transmission method, system and device in a kind of wireless network.
Background technology
Wireless communication technology has obtained using more and more widely at present.But present employed wireless network major part all manages by center base station and realizes, Cellular Networks is typically to realize the wireless network of communicating by letter by center base station, although the standard of WLAN (wireless local area network) does not stipulate that it must have center base station, WLAN (wireless local area network) generally also all has center base station in actual applications.Shortcoming with wireless network of center base station is: common website need to communicate by the management talent of center base station, thereby need to invest and safeguard center base station, and the cost of construction, maintaining network is high; Could work when common website only is positioned within the coverage of center base station, the coverage of network is restricted, and situation about arbitrarily distributing for website in the network can not be suitable for.
One of the main development direction in wireless communication technology future is exactly the wireless Ad Hoc network technology.Wireless self-organization network is built into a network by the self-organizing of website, and communicating by letter between website and the website undertaken by the mode of self-organizing in the network, need to not realize by center base station.The communication of wireless self-organization network does not rely on center base station, with respect to the network with center base station, can save the cost of construction and base station, maintenance centre, and ready-made of network implementation is low; Can communicate by the mode of multi-hop between the different websites in the wireless self-organization network, the coverage of network can be very large, and the situation that arbitrarily distributes for website in the network can also be suitable for, and applicability is strong.At present the developing direction paid close attention to of industrial circle is, by its function is employed new technology, strengthened to present mobile Ad hoc network, but the mobile Ad hoc network of practical low-cost wide popularization and application.
Wireless self-organization network is at media access control (Media Access Control at present, MAC) (Carrer Sensing Multiple Access/Collision Avoidance is avoided in the Carrier Sense Multiple Access/collision that mainly also is based on of layer employing, CSMA/CA) access technology of mechanism, as: all be mechanism adopting at 802.11s network and ZigBee-network at the MAC layer.CSMA/CA mechanism can not make the website in the mobile Ad hoc network fully use the wireless channel of finite capacity, and by the coordination between the website, then can make wireless channel obtain using more fully, improves the performance of mobile Ad hoc network MAC layer.
The sight that Benq can not fully be used in CSMA/CA mechanism wireless channel with wireless network shown in Figure 1.This network comprises website A, website B, website C, website D, website E and website F etc., and according to CSMA/CA mechanism, website A, website B, website C, website D, website E and website F can seize channel according to the needs of oneself.For example when emission website A and receiving station B rob account for channel after, according to CSMA/CA mechanism, the adjacent bus station of emission website A and receiving station B is the transmission of data more all.When launching website A to receiving station B the transmission of data, because emission website A and receiving station B have seized channel, the adjacent bus station C of emission website A, because in emission website A coverage, its channel detection result will be channel busy, according to CSMA/CA mechanism, it can not access channel.The adjacent bus station E of receiving station B, because in receiving station B coverage, according to CSMA/CA mechanism, website E can not access channel, even there are the transmission such as significant data is anxious to realize.
As seen, if in mobile Ad hoc network, only realize the MAC access of website according to CSMA/CA mechanism, only be to rely on whether to exist transfer of data to determine oneself whether can rob in the channel to account for channel to transmit between the website, as long as some websites belong to the adjacent bus station of emission website or receiving station, channel detection result will be channel busy, therefore, the adjacent bus station of emission website and receiving station is robbed in the process that accounts for channel and the transmission of data at emission website and receiving station, all can not the transmission of data, thereby so that channel resource can not be fully used, caused the waste of channel resource, entire system can not reach good performance.
Summary of the invention
In view of this, an object of the present invention is to provide a kind of data transmission method, system and device, the problem that causes channel resource not take full advantage of to solve data transmission mechanism of the prior art is to improve the overall performance of station data efficiency of transmission and system.For there is a basic understanding some aspects to the embodiment that discloses, the below has provided simple summary.This summary part is not to comment general, neither determine the key/critical component or describe the protection range of these embodiment.Its sole purpose is to present some concepts with simple form, with this preamble as following detailed description.
The embodiment of the invention provides the data transmission method in a kind of wireless network, comprising:
When the website in the wireless network has Frame to be sent;
If the website in the described wireless network is just at the adjacent bus station of the first receiving station of receive data, interference level according to the acceptable adjacent bus station of the first receiving station, and the path loss between self and the first receiving station, determine self spendable maximum transmission power, adopt the transmitting power that is not more than described spendable maximum transmission power to send Frame to targeted sites; And/or
If the website in the described wireless network is the adjacent bus station that is sending the second emission website of data, within the time period of the second emission website transmission Frame, send Frame to targeted sites.
In some optional embodiments, the process of the interference level of the acceptable adjacent bus station of station for acquiring the first receiving station in the described wireless network specifically comprises:
The information that comprises the interference level of the acceptable adjacent bus station of the first receiving station in the reservation acknowledgement frame that the first receiving station sends to the first emission website of correspondence;
Website in the described wireless network obtains the interference level of described acceptable adjacent bus station to the reservation acknowledgement frame of the first emission website transmission by receiving the first receiving station.
In some optional embodiments, the first receiving station is determined the mode of the interference level of acceptable adjacent bus station, specifically comprises:
The first receiving station calculates the interference level of its acceptable adjacent bus station according to the transmitting power of the current use of the first emission website and the combination of modulation coding mode; Perhaps,
The first receiving station is determined the interference level of acceptable adjacent bus station, determine the first emission website in the transmitting power and the modulation coding mode combination that after this send the minimum requirements that data will use according to the interference level of described acceptable adjacent bus station, and in the reservation acknowledgement frame, the transmitting power of the minimum requirements determined and modulation coding mode combination are sent to first and launch website.
In some optional embodiments, the website in the described wireless network is determined the process of the path loss between self and the first receiving station, specifically comprises:
The information that comprises the transmit power level that current reservation acknowledgement frame adopts in the reservation acknowledgement frame that the first receiving station sends;
Website in the described wireless network obtains the transmit power level that it adopts by the reservation acknowledgement frame of intercepting the transmission of the first receiving station, this reservation acknowledgement frame received power level that receives with self relatively calculates website in the described wireless network and the path loss between the first receiving station.
In some optional embodiments, the website in the described wireless network is that the process that targeted sites is replied the website in the described wireless network specifically comprises when sending the adjacent bus station of the first receiving station of data:
Website in the described wireless network determines that according to the employed transmitting power of the first receiving station described the first receiving station is to the interference level of self;
Determine the transmitting power of the minimum requirements that targeted sites is used to reply and the combination of modulation coding mode according to described interference level, the transmitting power of definite described minimum requirements be used to replying and the combination of modulation coding mode are sent to targeted sites;
The targeted sites use is not less than the transmitting power of above-mentioned minimum requirements and the combination of modulation coding mode is replied the Frame that the website in the described wireless network sends.
In some optional embodiments, the website in the described wireless network be sending data second the emission website adjacent bus station the time, also comprise:
Website in the described wireless network judges whether the second receiving station corresponding to described the second emission website is the adjacent bus station of self, when the second receiving station is not the adjacent bus station of self, carry out again the step that within the time period of the second emission website transmission Frame, sends Frame to targeted sites.
In some optional embodiments, the website in the described wireless network judges that whether the second receiving station is the adjacent bus station of self, specifically comprises:
Website in the described wireless network is known the second receiving station corresponding to described the second emission website from the Frame that described the second emission website that receives sends;
Website in the described wireless network judges by whether listening to the Frame that the second receiving station sends whether the second receiving station is the adjacent bus station of self; Perhaps, the adjacent bus station and the second receiving station that comprise in the adjacent bus station tabulation with self maintained mate, and judge whether the second receiving station is the adjacent bus station of self.
In some optional embodiments, the website in the described wireless network judges that by whether listening to the Frame that the second receiving station sends whether the second receiving station is the adjacent bus station of self, specifically comprises:
Before the second emission website is sending data, when coming channel reservation by collision-avoidance mechanism first, described website judges by whether listening to the reservation acknowledgement frame that is used for realizing channel reservation that the second receiving station sends whether the second receiving station is the adjacent bus station of self.
In some optional embodiments, describedly in sending time period of Frame, the second emission website sends Frame to targeted sites, specifically comprise:
The channel booking frame or the Frame that send by the second emission website obtain the duration length that the second emission website sends Frame, send the Frame of oneself within this duration.
The embodiment of the invention also provides the data transmission device in a kind of wireless network, comprising: obtain determination module, the first control module, the second control module and data transmission blocks;
The described determination module that obtains is when having Frame to be sent for website under self; If website is just to notify described the first control module at the adjacent bus station of the first receiving station of receive data under self, if and/or under self website be that the adjacent bus station that is sending the second emission website of data is notified described the second control module;
Described the first control module, be used for the interference level according to the acceptable adjacent bus station of the first receiving station, and the path loss between self and the first receiving station, determine self affiliated spendable maximum transmission power of website, control described data transmission blocks and adopt the transmitting power that is not more than described spendable maximum transmission power to send Frame to targeted sites;
Described the second control module was used for controlling described data transmission blocks and sends Frame to targeted sites within the time period of the second emission website transmission Frame;
Described data transmission blocks is used for sending Frame to be sent to targeted sites.
In some optional embodiments, described the first control module specifically is used for:
Obtain the information of the interference level of described acceptable adjacent bus station to the reservation acknowledgement frame of the first emission website transmission of correspondence by receiving the first receiving station; Wherein, the information that comprises the interference level of the acceptable adjacent bus station of the first receiving station in the reservation acknowledgement frame that the first receiving station sends to the first emission website.
In some optional embodiments, described the first control module specifically is used for:
Obtain the transmit power level that it adopts by intercepting the reservation acknowledgement frame that the first receiving station sends, this reservation acknowledgement frame received power level comparison that receives with self calculates the path loss between self place website and the first receiving station; Wherein, the information that comprises the transmit power level that current reservation acknowledgement frame adopts in the reservation acknowledgement frame that the first receiving station sends.
In some optional embodiments, described the first control module also is used for:
When receiving the reservation acknowledgement frame that the first receiving station replys to the first emission website, according to the employed transmitting power of the first receiving station of carrying in the described reservation acknowledgement frame, determine that described the first receiving station is to the interference level of website under self;
Determine that according to described interference level targeted sites is used for the transmitting power of minimum requirements and the modulation coding mode combination of immediate acknowledgment, transmitting power and the modulation coding mode combination of the described minimum requirements for immediate acknowledgment of controlling that described data transmission blocks will determine offer targeted sites.
In some optional embodiments, described the second control module also is used for:
Self place website is when sending the adjacent bus station of the second emission website of data, judge that whether the second receiving station corresponding to described the second emission website be the adjacent bus station of self place website, when the second receiving station is not the adjacent bus station of self place website, carry out again the described data transmission blocks of control sends Frame to targeted sites in the second emission website sends time period of Frame step.
In some optional embodiments, described the second control module specifically is used for:
From the Frame that described the second emission website that receives sends, know the second receiving station corresponding to described the second emission website; By whether listening to the Frame that the second receiving station sends, judge whether the second receiving station is the adjacent bus station of self; Perhaps, the adjacent bus station and the second receiving station that comprise in the adjacent bus station tabulation with self maintained mate, and judge whether the second receiving station is the adjacent bus station of self.
In some optional embodiments, described the second control module specifically is used for:
Before the second emission website is sending data, when coming channel reservation by collision-avoidance mechanism first, by whether listening to the reservation acknowledgement frame that is used for realizing channel reservation that the second receiving station sends, judge whether the second receiving station is the adjacent bus station of self.
In some optional embodiments, described the second control module specifically is used for:
The channel booking frame or the Frame that send by the second emission website obtain the duration length that the second emission website sends Frame, send the Frame of oneself within this duration.
The embodiment of the invention also provides the communication site in a kind of wireless network, comprises above-mentioned data transmission device.
The embodiment of the invention also provides the data transmission system in a kind of wireless network, comprises at least two above-mentioned communication sites.
The data transmission method that the embodiment of the invention provides, system and device, for the Source Site that data to be sent are arranged, if himself be just at the receiving station of receive data and/or sending the adjacent bus station of the emission website of data, then adopt the corresponding evasion mode that disturbs to send data, if the adjacent bus station of receiving station, adopt a transmitting power that is not more than definite maximum transmission power to send data, to avoid interference the data receiver of receiving station; If during the adjacent bus station of emission website, within the time period of emission website transmission Frame, send Frame to targeted sites, to avoid and the phase mutual interference of launching between the website.Thereby can improve the utilance of channel resource, reduce the idle possibility of channel resource, channel resource is fully utilized as far as possible, improve speed and the efficient of transfer of data, and then improve the overall performance of system.
For above-mentioned and relevant purpose, one or more embodiment comprise the feature that the back will describe in detail and particularly point out in the claims.Below explanation and accompanying drawing describe some illustrative aspects in detail, and its indication only is some modes in the utilizable variety of way of principle of each embodiment.Other benefit and novel features will consider by reference to the accompanying drawings and become obviously along with following detailed description, and the disclosed embodiments are to comprise being equal to of all these aspects and they.
Figure of description
Fig. 1 is the transfer of data situation exemplary plot in the wireless self-organization network in the prior art;
Fig. 2 is the flow chart of data transmission method in the embodiment of the invention;
Fig. 3 is the structural representation of data transmission system in the embodiment of the invention;
Fig. 4 is the flow chart of data transmission method in the embodiment of the invention one;
Fig. 5 is the flow chart of data transmission method in the embodiment of the invention two;
Fig. 6 is the structural representation of data transmission device in the embodiment of the invention.
Embodiment
The following description and drawings illustrate specific embodiments of the present invention fully, to enable those skilled in the art to put into practice them.Other embodiments can comprise structure, logic, electric, process and other change.Embodiment only represents possible variation.Unless explicitly call for, otherwise independent assembly and function are optional, and the order of operation can change.The part of some embodiments and feature can be included in or replace part and the feature of other embodiments.The scope of embodiment of the present invention comprises the gamut of claims, and all obtainable equivalents of claims.In this article, these embodiments of the present invention can be represented with term " invention " individually or always, this only is for convenient, and if in fact disclose and surpass one invention, not that the scope that will automatically limit this application is any single invention or inventive concept.
In the MAC access technology based on CSMA/CA, in the process of emission website and receiving station the transmission of data, the adjacent bus station of emission website and receiving station all can not the transmission of data, thereby cause wireless channel not take full advantage of, the MAC efficiency of transmission is low, the present application people finds, in the process of emission website and receiving station the transmission of data, near the emission website adjacent bus station (Source Site that can be called data) is if the transmission of data is given corresponding targeted sites, as long as corresponding targeted sites does not belong to the adjacent bus station of launching website, Source Site and targeted sites just can attempt carrying out transfer of data as one group of new emission website and receiving station; That is to say, owing to whether can carry out transfer of data between the website and in fact should be being decided by the channel busy of targeted sites position, and be that the channel that hurries may not be the channel that hurries in the targeted sites of data in the Source Site of data, in this case, actual can the transmission of data.In addition, in emission website and receiving station (can be called the first emission website and the first receiving station) transmission course, near the receiving station adjacent bus station as the Source Site if the transmission of data is given corresponding targeted sites, as long as the data of this Source Site send the correct reception of the data that do not affect above-mentioned the first receiving station, then this adjacent bus station also can form one group of new emission website and receiving station realization transfer of data as Source Site and corresponding targeted sites.
Based on this, the embodiment of the invention provides the data transmission method in a kind of wireless network, can utilize more fully idle channel resource, improves data transmission efficiency.The method flow process comprises the steps: as shown in Figure 2
S11: the website in the wireless network has Frame to be sent.
Website in the wireless network has Frame to be sent (this moment, the website in this wireless network also was a Source Site), whether can send data by the channel of the targeted sites of correspondence idle decision the whether.Even that is to say as emission website and/or receiving station are arranged near the website in the wireless network of Source Site, when the website in the wireless network is thought channel busy, as long as corresponding targeted sites channel idle, in fact also can carry out transfer of data, the transfer of data that just need to consider self when transfer of data can or can not cause interference to the transfer of data of emission website and receiving station, affects its correct receive data.
Website in the wireless network, when there is the situation of emission, reception in its adjacent bus station, the difference of emission website and/or receiving station according to this adjacent bus station, there are three kinds of possible situations, the first situation is just to exist in the adjacent bus station of the website in this wireless network at the first receiving station of receive data, and this first receiving station is realized transfer of data with the first corresponding emission website; The second situation is to have the second emission website that is sending data in the adjacent bus station of the website in this wireless network, and this second emission website is realized transfer of data with the second corresponding receiving station; The third situation is just to exist the first receiving station at receive data to have simultaneously the second emission website that is sending data in the adjacent bus station of the website in this wireless network.
Above-mentioned the first emission website and the first receiving station, and the second emission website and the second receiving station distinguished describing for convenience, " first " wherein, " second " are not emphasized the implication of order.。
When realizing the method that the present invention proposes, relate between the first emission website and the first receiving station, with second launch the realization mechanism that passes through the collision-avoidance mechanism channel reservation between website and the second receiving station.In passing through the mechanism of collision-avoidance mechanism channel reservation, the website (namely launching website) that sends data sends first the mac frame of a weak point to the website (being receiving station) of receive data, in this mac frame, comprise it and sent the needed time of current data, the adjacent bus station of emission website receives this mac frame, other adjacent bus station except receiving station can not access channel in the above-mentioned time period, receiving station is after receiving the mac frame of above-mentioned weak point, also reply with the mac frame of a weak point, in this mac frame, also comprise and realize that above-mentioned data transmit the needed time, the adjacent bus station of receiving station receives this mac frame, and other adjacent bus station except the emission website can not access channel in the above-mentioned time period.802.11 the RTS-CTS mechanism in the WLAN (wireless local area network) is exactly a kind of typical realization mechanism by the collision-avoidance mechanism channel reservation.In addition, in 802.11 WLAN (wireless local area network), the emission website is replied it by the ACK frame by sending the short mac frame that carries data, receiving station to receiving station, also can realize coming channel reservation by collision-avoidance mechanism.For the convenience of explaining, in description of the invention, we call the channel booking frame to the mac frame of the weak point that emission website in by the mechanism of collision-avoidance mechanism channel reservation sends, and the mac frame that receiving station is replied the channel booking frame is called the reservation acknowledgement frame.
Further, send in the structure in " 2 acknowledgement frames of 2 Frame-Di of 1 acknowledgement frame-Di of the 1st Frame-Di ...-Di n Frame-n acknowledgement frame " such data, if comprised the information of the Frame busy channel of rear or back in previous Frame, acknowledgement frame, then previous Frame, acknowledgement frame also can be considered to be respectively channel booking frame and reservation acknowledgement frame.
In the method that the present invention proposes, for near the situation that just has the website in the wireless network at the first receiving station of receive data, come channel reservation by collision-avoidance mechanism between the first emission website and the first receiving station and in the reservation acknowledgement frame that the first receiving station sends, will comprise the information of the interference level of the acceptable adjacent bus station of the first receiving station, the available transmitting power of maximum when described website will utilize this information to determine self transmission data.For near the situation that the second emission website that sends data is arranged the website in the wireless network, if come channel reservation by collision-avoidance mechanism between the second emission website and the second receiving station, then described website can judge whether the second receiving station is the adjacent bus station of self by the reservation acknowledgement frame of intercepting the transmission of the second receiving station; If do not come channel reservation by collision-avoidance mechanism between the second emission website and the second receiving station, then described website need to tabulate to judge whether the second receiving station is the adjacent bus station of self by the adjacent bus station of self maintained, and when the second receiving station was not the adjacent bus station of self, described website just carried out corresponding data and sends.
In the method that the present invention proposes, also relate to the calculating of path loss between adjacent sites (referred to as path loss), this can write by the information with the transmit power level of physical frame in the mac frame that sends (generally being in the mac frame head) and realize.After the website that receives this mac frame receives this mac frame, according to the physical parameter of the physical frame that receives, the power level of the physical frame signal that obtains receiving; After this, after recovering mac frame by input, from mac frame, obtain the transmit power level that it adopts; The power level of transmit power level with the signal that receives compared, as: with the power level of transmit power level divided by the signal that receives, namely obtain the path loss between receiving station and the emission website.In the method that the present invention proposes, in the time of need only requiring transmitting channel reservation frame and reservation acknowledgement frame the information of transmit power level is put into corresponding mac frame and can realize the desired function of the inventive method.
Alternatively, in the communication of wireless network, may regularly need to calculate the path loss between the website, this can by in general manner in mac frame (generally being in the mac frame head) function that a transmit power level territory comes the realizing route loss to calculate is set.The transmit power level that the website of transmission mac frame adopts physical frame writes in the mac frame that sends, then send this mac frame, after the website that receives this mac frame receives this mac frame, calculate it and send path loss between the website of this mac frame according to the flow process identical with a upper trifle.
In the method that the present invention proposes, the website in the described wireless network sends Frame to its targeted sites, can adopt do not reply, the different answer methods such as delayed response and immediate acknowledgment, the scope of application that sends to increase this data.Wherein, be just in the situation of the adjacent bus station of the first receiving station of receive data for the website in the wireless network, website in the described wireless network can disturb the signal that the first receiving station sends as its acceptable, calculate transmitting power and the modulation coding mode combination of the minimum requirements that himself targeted sites should adopt, make targeted sites carry out immediate acknowledgment to the data that send.
In description of the invention, modulation coding mode refers to modulation system and the coded system that corresponding physical frame adopts, such as: 802.11a protocol definition the physical layer modulation coding mode that adopts have 8 kinds, comprising 1/2 code check-BPSK, 1/2 code check-QPSK, 1/2 code check-16QAM, 3/4 code check-64QAM etc.
When the website in the wireless network need to send Frame, can judge that self is whether just at the adjacent bus station of the first receiving station of receiving data frames and judge that self is whether just at the adjacent bus station of the second emission website of transmit data frames.And according to judged result, determine to carry out following which step, concrete, if the adjacent bus station of the first receiving station, execution in step S12 and step S13; If the adjacent bus station of the second emission website, execution in step S14.
S12: if self be just at the adjacent bus station of the first receiving station of receive data, interference level according to the acceptable adjacent bus station of the first receiving station, and the path loss between self and the first receiving station, determine self spendable maximum transmission power.
The first emission website and the first receiving station come channel reservation by collision-avoidance mechanism first at the beginning of the transmission of data.The channel booking frame that the first receiving station sends by the first emission website is or/and other mac frame that sends before this calculates it and the first path loss of launching between the website.If can allow that its adjacent bus station sends data in the first receiving station decision data receiver below, then it can be according to it and the path loss of the first emission between the website, transmitting power and the modulation coding mode of determining the first minimum requirements that will adopt of emission website make up, and self maximum can be born interference level.After this, the first emission website adopts the transmitting power and the modulation coding mode that are not less than above-mentioned minimum requirements to make up to send data.The adjacent bus station of the first receiving station then can receive the information that above-mentioned maximum can be born interference level.After website in the wireless network receives the reservation acknowledgement frame that the first receiving station sends, from this reservation acknowledgement frame, obtain the information that the first receiving station maximum can be born interference level, according to the path loss between it and the first receiving station, calculate its and send the maximum transmit power level that data can adopt again.After this, it can send the Frame of oneself under this maximum transmit power level.The reservation acknowledgement frame that website in the described wireless network can send by the first receiving station is or/and the mac frame that the first receiving station sends before this calculates the path loss between it and the first receiving station.
In the description of the method that the present invention is proposed, the transmitting power of minimum requirements and modulation coding mode combination refer to: the transmitting power of the minimum requirements that requires to adopt for mac frame can be sent reliably and the combination of modulation coding mode, wherein, transmitting power is larger, the transmission of mac frame is more reliable, the modulating-coding exponent number is lower, and the transmission of mac frame is also more reliable.Here, the modulating-coding exponent number is lower, and to refer to corresponding physical layer data rate lower, and the modulating-coding exponent number is higher, and to refer to corresponding physical layer data rate higher.Comprise following several situation with transmitting power and the modulation coding mode combination transmission mac frame that is not less than minimum requirements: the transmitting power that the modulation coding mode that provides in the combination of (1) website employing minimum requirements and numerical value are not less than the transmitting power that provides in the combination sends mac frame; (2) modulation coding mode that the transmitting power that provides in the website employing combination and exponent number are not higher than the modulation coding mode that provides in the combination sends mac frame; (3) website adopts the combination of a kind of transmitting power and modulation coding mode to send mac frame, this kind combination is made up more reliably the transmission of data than transmitting power and the modulation coding mode of minimum requirements, but its transmitting power may be lower than the transmitting power in the minimum requirements combination, and perhaps its modulating-coding exponent number may be higher than the modulating-coding exponent number in the minimum requirements combination.
Particularly, website in the wireless network is just when the adjacent bus station of the first receiving station of receive data, two parameters of path loss between interference level by obtaining the acceptable adjacent bus station of the first receiving station and self and the first receiving station, determine self spendable maximum transmission power, wherein:
The process of the interference level of the acceptable adjacent bus station of station for acquiring the first receiving station in the wireless network specifically comprises: the information that comprises the interference level of the acceptable adjacent bus station of the first receiving station in the reservation acknowledgement frame that the first receiving station sends to the first emission website of correspondence; Website in the wireless network obtains the information of the interference level of acceptable adjacent bus station to the reservation acknowledgement frame of the first emission website transmission by receiving the first receiving station.Wherein, the first receiving station is according to it and the path loss of the first emission between the website, determine: the transmitting power of the minimum requirements that the first emission website will adopt and the interference level of modulation coding mode combination and the first receiving station acceptable adjacent bus station, after this, the first cell site names a person for a particular job and comes to send data to the first receiving station with the transmitting power that is not less than this minimum requirements and modulation coding mode combination, here, the transmitting power of the minimum requirements that the first emission website will adopt and two parameters of interference level of modulation coding mode combination and the first receiving station acceptable adjacent bus station are that coupling is used, the interference level of the first receiving station acceptable adjacent bus station is higher, and is also higher to the requirement that transmitting power and the modulation coding mode of the first minimum requirements that will adopt of emission website makes up; Alternatively, the first receiving station can be according to transmitting power and the modulation coding mode combination of the current use of the first emission website, calculate the interference level of its acceptable adjacent bus station, after this, the first emission website sends data with transmitting power and the modulation coding mode combination of current use to the first receiving station; Alternatively, the first receiving station also can be determined first the interference level of its acceptable adjacent bus station, then determining the first emission website according to the interference level of described acceptable adjacent bus station makes up at the transmitting power and the modulation coding mode that after this send the minimum requirements that data will use, and in the reservation acknowledgement frame, the transmitting power of this minimum requirements and modulation coding mode combination are sent to the first emission website, after this, the first cell site names a person for a particular job, and use is not less than the transmitting power of this minimum requirements and the combination of modulation coding mode sends data to the first receiving station.
In general manner, in the interference level of the transmitting power of the first minimum requirements that will adopt of emission website and modulation coding mode combination and the first receiving station acceptable adjacent bus station definite, in three parameters of interference level of transmitting power, the first emission modulation coding mode of website and the acceptable adjacent bus station of the first receiving station of the first emission website, the first receiving station can be selected first wherein two parameters according to physical feasibility, calculates thus the 3rd parameter.
Website in the wireless network is determined the process of the path loss between self and the first receiving station, specifically comprises: the information that comprises the transmit power level that current mac frame adopts in the frame head of the mac frame that the first receiving station sends; Website in the wireless network obtains the transmit power level that it adopts by the mac frame of intercepting the transmission of the first receiving station, this mac frame received power level that receives with self relatively calculates website in the wireless network and the path loss between the first receiving station.Wherein mac frame is that the first receiving station is launched the reservation acknowledgement frame of website transmission or/and other mac frame to first.
In method described above, the reservation acknowledgement frame that website in the wireless network can only be replied to the first emission website of correspondence by intercepting the first receiving station, obtain the interference level of the acceptable adjacent bus station that carries in the reservation acknowledgement frame and the transmit power level that adopts, and then obtain the interference level of the acceptable adjacent bus station of the first receiving station and two parameters of path loss between Source Site and the first receiving station.
Preferably, the signal that the website in the wireless network can also send the first receiving station according to the employed transmitting power of the first receiving station, determines that the first receiving station is to the interference level of self as the interference for self; Determine that according to this interference level targeted sites is used for transmitting power and the modulation coding mode combination of the minimum requirements of immediate acknowledgment, and the transmitting power of this minimum requirements and modulation coding mode combination offered targeted sites, so that targeted sites can adopt the transmitting power and the modulation coding mode combination that are not less than this minimum requirements to carry out immediate acknowledgment.Like this, targeted sites can be carried out immediate acknowledgment to the Frame that the website in the described wireless network sends.In this application, when the first receiving station is replied at the Frame that after this first emission website is sent, or agreement adopts current power that Frame is replied, or adopt new transmitting power to reply, under latter event, in the reservation acknowledgement frame that the first receiving station sends to the first emission website, will comprise the information of this new transmitting power.The current transmit power that website in the wireless network adopts according to the first receiving station agreement or in the channel booking frame information of the new transmitting power that sends, determine the first receiving station to the interference level of self.
S13: adopt the transmitting power that is not more than spendable maximum transmission power to send Frame to targeted sites.
Website in the wireless network uses and is not more than above-mentioned spendable maximum transmission power transmission data, thereby can not cause severe jamming to the reception of the first receiving station.Even the first receiving station can receive the signal of the website emission in the first emission website and the above-mentioned wireless network simultaneously like this, there is signal aliasing, but because the signal use of the first emission website is highly reliable transmitting power and the combination of modulation coding mode, what the website in the above-mentioned wireless network used is a lower transmitting power that is not higher than spendable maximum transmission power, therefore, the first receiving station can be regarded transmitting of the website in the above-mentioned wireless network as interference signal, from the signal of aliasing, receive the signal of own required reception, get access to own needed data.
Website in the wireless network sends Frame to its targeted sites, can adopt do not reply, the different answer methods such as delayed response and immediate acknowledgment, wherein, immediate acknowledgment can be obtained reliability and the minimum propagation delay time of best transfer of data.The method of targeted sites realization immediate acknowledgment is described in step S12.
S14: if self be the adjacent bus station that is sending the second emission website of data, within the time period of the second emission website transmission Frame, send Frame to targeted sites.
When the website in the wireless network belongs to the adjacent bus station of the second emission website, the channel detection result of the website in the wireless network is channel busy, if but in fact its corresponding targeted sites is not launched in the coverage of website second, then the second transmitting of website of emission can not caused interference to targeted sites, therefore send in the time period of data to the second receiving station at the second emission website, if the website in the wireless network is to the targeted sites the transmission of data, the reception of targeted sites can not be affected.In the current mechanism, the channel detection result of the website in the above-mentioned wireless network is channel busy, so can be to the targeted sites the transmission of data, the application's mode then can realize website in the above-mentioned wireless network and the transfer of data between the targeted sites in the second emission website and the second receiving station the transmission of data, reduce the waste of channel resource, improved efficiency of transmission.
For the communication that makes new adding does not have influence on original communication, in the communicating by letter of above-mentioned second emission website and the second receiving station, the website in the wireless network just will determine that the second receiving station at receive data is not the adjacent bus station of oneself.Whether realize by the collision-avoidance mechanism channel reservation whether current communication and wireless network stations safeguard situation different of the tabulation of adjacent bus station, and the website in the described wireless network also adopts diverse ways to determine whether the second receiving station is the adjacent bus station of oneself according to the second emission website and the second receiving station.
Realize in the current situation of communicating by letter at the second emission website by the collision-avoidance mechanism channel reservation with the second receiving station, behind the second emission website transmitting channel reservation frame, the website in the wireless network is by intercepting channel, seeing whether oneself can receive the reservation acknowledgement frame.If can receive the reservation acknowledgement frame, illustrate that then the second receiving station is the adjacent bus station of oneself, after this, it can not send the Frame of oneself; If can not receive acknowledgement frame, illustrate that then the second receiving station is not the adjacent bus station of oneself, after this, it can send the Frame of oneself.
In the communication of mobile Ad hoc network, the website in the network may safeguard that the tabulation of an own adjacent bus station is so that the communication between website.In this case, also will there be the tabulation of its adjacent bus station in the website in the described wireless network, and whether it can find above-mentioned the second receiving station by this adjacent bus station tabulation is the adjacent bus station of self.For the website in the described wireless network, when the second receiving station is the adjacent bus station of oneself, it can not send the Frame of oneself; And when the second receiving station is not the adjacent bus station of oneself, it can send the Frame of oneself.
In the specific implementation that data send, the channel booking frame that website in the described wireless network sends by the second emission website or the Frame of transmission (as from the frame head of the Frame that sends) obtain the duration of this transmissions Frame, the then Frame of transmission oneself within this duration.Here the duration of said transmission Frame can be the duration of a Frame, also can be to comprise the duration that (contains) Frame that sends continuously more than two but do not comprise acknowledgement frame.
Send for the data of the website in the described wireless network, the different answer methods such as targeted sites can adopt and not reply, delayed response and immediate acknowledgment, thus can increase the range of application that this data send.Adopt in targeted sites in the situation of immediate acknowledgment, it will determine still whether the second receiving station or the second receiving station and the second emission website are its adjacent bus station.
In the above-mentioned realization flow, when the website in the wireless network need to send Frame when (this website is called the Source Site), can judge that self is whether just at the adjacent bus station of the first receiving station of receiving data frames and judge that self is whether just at the adjacent bus station of the second emission website of transmit data frames.And according to judged result, determine to carry out following which step, concrete, if the Source Site is the adjacent bus station of the first receiving station, execution in step S12 and step S13, if the adjacent bus station of the second emission website, execution in step S14.In addition, website in wireless network be the adjacent bus station of the first receiving station be again the adjacent bus station of the second emission website, then can execution in step S12 and execution in step S14 when step S13, thereby so that both guaranteed not to form the phase mutual interference with the first contiguous receiving station, also guarantee to form the phase mutual interference with the second contiguous emission website.Website in wireless network neither the adjacent bus station of the second emission website neither the first receiving station adjacent bus station, then can when definite targeted sites channel idle, directly send Frame.
The said method that the embodiment of the invention provides can be realized in the data transmission system that comprises two websites as shown in Figure 3 at least.For example: system as shown in Figure 3 comprises website A, website B, website C, website D, website E, website F, website G and website H, wherein the first emission website A sends Frame to the first receiving station B, the second emission website C sends Frame to the second receiving station D, website E is the adjacent bus station of the first receiving station B, website F is the adjacent bus station of the second emission website C, website G be the adjacent bus station of the first receiving station B also be the adjacent bus station of the second emission website C, website H neither the adjacent bus station of the first receiving station B neither the second emission website C adjacent bus station.Then website E is as the Source Site, in the time of need to be to its targeted sites the transmission of data, needs to consider to carry out above-mentioned step S12 and step S13.Website F is as the Source Site, in the time of need to be to its targeted sites the transmission of data, needs to consider to carry out above-mentioned step S14.Website G is as the Source Site, in the time of need to be to its targeted sites the transmission of data, needs to consider to carry out above-mentioned step S12 and step S13, also will carry out above-mentioned step S14.Website H is as the Source Site, in the time of need to be to its targeted sites the transmission of data, and direct the transmission of data when definite targeted sites channel idle.
Below by specific embodiment, illustrate that in data transmission system as shown in Figure 3 the adjacent bus station of emission website and the adjacent bus station of receiving station are realized the flow process of transfer of data.
Embodiment one:
The data transmission method that the embodiment of the invention one provides, describe that website in the wireless network is positioned near the receiving station as Source Site (all being referred to as the Source Site in the following description), the realization flow of transfer of data when belonging to the adjacent bus station of receiving station in detail, this realization flow comprises the steps: as shown in Figure 4
S101: the reservation acknowledgement frame that the first receiving station is replied to the first emission website of correspondence is intercepted in the Source Site.
Take above-mentioned system shown in Figure 3 as example, the first receiving station is website B, and the first emission website is website A, and the Source Site is the adjacent bus station of the first receiving station, for example is website E.
When the first emission website (such as the website A among Fig. 3) is ready for sending long Frame or one group of Frame, can send first a request and send (Request To Send, RTS) frame or short Frame occupy channel (this RTS frame and short Frame are the channel booking frame), the first receiving station (the website B among Fig. 3) clear to send (CTS) (Clear To Send, CTS) frame or affirmation (Acknowledgment, ACK) frame is replied, in this reservation acknowledgement frame, the first receiving station provides transmitting power and the modulation coding mode combination that requires its employed minimum requirements when after this sending Frame to the first emission website, the interference level of acceptable adjacent bus station and the transmit power level that adopts.
S102: the Source Site parses the interference level of the acceptable adjacent bus station that wherein carries and the transmit power level that adopts from the reservation acknowledgement frame that receives.As in Fig. 3, when Source Site E receives the reservation acknowledgement frame that the first receiving station B replys, the interference level of the acceptable adjacent bus station of the first receiving station that wherein carries and the transmit power level that adopts are parsed.
Meanwhile, the first emission website A also receives this reservation acknowledgement frame, and therefrom parse transmitting power and the modulation coding mode combined information of minimum requirements, after this, it will send data to the first receiving station B with the transmitting power that is not less than this minimum requirements and modulation coding mode combination.
S103: self spendable maximum transmission power is determined according to the interference level of the acceptable adjacent bus station of the first receiving station that carries in the reservation acknowledgement frame and the transmit power level that adopts in the Source Site.
The transmit power level that adopt according to the first receiving station that carries in the reservation acknowledgement frame Source Site, determine the path loss of self and the first receiving station, and then, according to the interference level of the acceptable adjacent bus station that carries in the path loss of self and the first receiving station and the reservation acknowledgement frame, determine self spendable maximum transmission power again.For example: the website E that the transmit power level that the first receiving station B that carries in the reservation acknowledgement frame of the website E among Fig. 3 according to the first receiving station B adopts is determined and the path loss between the website B, and then, the interference level of the acceptable adjacent bus station of the first receiving station B that carries in the acknowledgement frame according to reservation again calculates the spendable maximum transmission power of website E self in the process of website B receive data.Wherein, satisfy following formula: P between the interference level of the spendable transmitting power in path loss and Source Site, the acceptable adjacent bus station of receiving station T≤ L * P RWherein, L is path loss, P TBe the spendable transmitting power in Source Site, P RBe the interference level (interference power level) of the acceptable adjacent bus station of receiving station, L * P RBe the spendable maximum transmission power in Source Site.Here, path loss is defined as the ratio of two ends, path transmitting power and received power.
Preferably, when the Source Site receives the reservation acknowledgement frame that the first receiving station replys to the first emission website, if arrange the first receiving station after this to the current transmitting power of the middle employing of replying of Frame, perhaps having comprised it at this reservation acknowledgement frame after this replys middle with the transmitting power of using to Frame, the then Source Site interference that this transmitting power can be formed self as the first receiving station, and obtain the parameter of corresponding interference level; Determine that according to this interference level parameter targeted sites is used to carry out transmitting power and the modulation coding mode combination of the minimum requirements that Frame replys.For example: the adjacent bus station E of the first receiving station B shown in Fig. 3 can reply middle institute with the transmit power level of using at Frame according to the first receiving station B simultaneously, calculates the transmit power level of website B to the interference of website E self formation.Concrete, the adjacent bus station E of the first receiving station B can go out the first receiving station to the interference level of its formation according to the path loss calculation of its corresponding targeted sites of website E self, and then calculates transmitting power and the modulation coding mode combination of the needed minimum requirements of interference that overcomes the first receiving station B when its targeted sites is replied.
When website E sends data to its targeted sites, transmitting power and the modulation coding mode combination of the needed minimum requirements that calculates are offered targeted sites, and targeted sites makes up to carry out immediate acknowledgment with the transmitting power and the modulation coding mode that are not less than this minimum requirements.Even reply with the highest transmitting power of wireless network protocol regulation and the modulation coding mode of lowest-order if website E finds its targeted sites, himself can not overcome the first receiving station B to the interference of acknowledgement frame, then it can tell targeted sites not need to carry out immediate acknowledgment (targeted sites will be carried out delayed response or do not replied) by sign at the Frame that sends.
S104: the Source Site adopts the transmitting power that is not more than the spendable maximum transmission power of determining to send Frame to targeted sites.
In the communication process of the first emission website A and the first receiving station B, if the adjacent bus station E of the first receiving station B needs to send data, just can carry out the data transmission with not being higher than above-mentioned maximum transmit power level.When website E sends Frame with the power level that is not more than this maximum transmission power, can not affect the data receiver of website B.That is to say, when the first emission website A adopts higher transmitting power to transmit to the first receiving station B, website E still can adopt lower transmitting power to transmit to its targeted sites, thereby increased the chance of website access channel in the ad hoc network system, improved the harmoniously working capability of whole self-organizing network.
Preferably, definite transmitting power and modulation coding mode combination for the minimum requirements of replying are being carried in the Source Site when targeted sites sends Frame, targeted sites is carried out immediate acknowledgment with the transmitting power and the modulation coding mode combination that are not less than this minimum requirements after receiving this information.
Embodiment two:
The data transmission method that the embodiment of the invention two provides, the website of describing in detail in the wireless network is positioned near emission website realization flow, transfer of data when belonging to the adjacent bus station of launching website as Source Site (all being referred to as the Source Site in the following description), this realization flow comprises the steps: as shown in Figure 5
S201: the Frame that the second emission website sends is intercepted in the Source Site.
Take above-mentioned system shown in Figure 3 as example, the second emission website is website C, and the second receiving station is website D, and the Source Site is the adjacent bus station of the second emission website, for example is website F.
As shown in Figure 3, the second emission website C is when sending a Frame, its adjacent bus station can be by frame head or the other parts of intercepting this Frame, obtain the information such as duration length that current data frame sends, the Frame that for example website F sends by intercepting the second emission website C among Fig. 3 obtains the duration length that it sends Frame.
S202: the second receiving station corresponding to the second emission website known in the Source Site from the Frame that the second emission website that receives sends.
S203: the whether adjacent bus station of self of the second receiving station is judged in the Source Site.If not, execution in step S204, otherwise execution in step S205.
The Source Site tabulates to judge by its adjacent bus station whether the second receiving station is its adjacent bus station.If the second receiving station is not its adjacent bus station, enter next step S204; If the second receiving station is its adjacent bus station, after this it will not send data, and flow process enters step S205.
This step judge the second receiving station whether self adjacent bus station be optional step, when Source Site self be sending data second the emission website adjacent bus station the time, from the Frame that the second emission website that receives sends, know the second receiving station corresponding to the second emission website, judge whether the second receiving station corresponding to the second emission website is the adjacent bus station of self, when the second receiving station is not the adjacent bus station of self, carry out again the step that within the time period of the second emission website transmission Frame, sends Frame to targeted sites.
Website in the wireless network is as the Source Site, judge that whether the second receiving station is the adjacent bus station of self, specifically comprises: the website in the wireless network is known the second receiving station corresponding to the second emission website from the Frame that the second emission website that receives sends; Website in the wireless network judges by whether listening to the mac frame that the second receiving station sends whether the second receiving station is the adjacent bus station of self; Perhaps, the adjacent bus station that comprises in the adjacent bus station tabulation with the second receiving station and self maintained mates, and judges whether the second receiving station is the adjacent bus station of self.
Before the second emission website is sending data, when coming channel reservation by collision-avoidance mechanism first, website in the above-mentioned wireless network judges by whether listening to the acknowledgement frame that is used for realizing channel reservation that the second receiving station sends whether the second receiving station is the adjacent bus station of self.It is the mac frame that the website in the wireless network sends by whether listening to the second receiving station, judge when whether the second receiving station is the adjacent bus station of self, if the second emission website is before sending data, reserved channel by collision-avoidance mechanism first, what then the website in the wireless network was intercepted is the reservation acknowledgement frame that is used for realizing channel reservation that the second receiving station sends.
Website in the wireless network can also judge whether the latter is its adjacent bus station by the mac frame of intercepting other type except the reservation acknowledgement frame that the second receiving station sends.In this realization, whether the website in the wireless network will be its adjacent bus station not knowing whether the second emission website will prejudge the second receiving station when the second receiving station sends data, thereby just relate to and to store the address of the mac frame that receives, the method of this method and adjacent bus station tabulation is equal to, or the latter's a part.
Continue to use the example of top, as shown in Figure 3, the adjacent bus station F of the second emission website C is finding that the second emission website C is when sending the Frame of longer duration, extract the receiving station that this Frame mails to the frame head of the Frame that the second emission website C that adjacent bus station F receives from monitoring sends---the address of the second receiving station D, judge the whether adjacent bus station of self of the second receiving station D, if determine that the second receiving station D is the adjacent bus station of self, then it abandons this time communication, otherwise, carry out this time communication.
S204: the Source Site sends Frame to targeted sites within the time period of the second emission website transmission Frame.
S205: finish.
Based on same inventive concept, the embodiment of the invention also provides a kind of data transmission device, this device can be arranged in any one communication site in as shown in Figure 3 the data transmission system, the structure of this device comprises as shown in Figure 6: obtain determination module 10, the first control module 20, the second control module 30 and data transmission blocks 40.
Obtain determination module 10, when for website under self Frame to be sent being arranged; If website is just to notify the first control module 20 at the adjacent bus station of the first receiving station of receive data under self, if and/or under self website be that the adjacent bus station that is sending the second emission website of data is notified the second control module 30.
The first control module 20, be used for the interference level according to the acceptable adjacent bus station of the first receiving station, and the path loss between self and the first receiving station, determine self affiliated spendable maximum transmission power of website, control data transmission blocks 40 adopts the transmitting power that is not more than spendable maximum transmission power to send Frame to targeted sites.
The second control module 30 was used for control data transmission blocks 40 and sends Frame to targeted sites within the time period of the second emission website transmission Frame.
Data transmission blocks 40 is used for sending Frame to be sent to targeted sites.
Preferably, above-mentioned the first control module 20, the concrete information that is used for obtaining to the reservation acknowledgement frame of the first emission website transmission of correspondence by receiving the first receiving station the interference level of the acceptable adjacent bus station of the first receiving station; Wherein, the information that comprises the interference level of the acceptable adjacent bus station of the first receiving station in the reservation acknowledgement frame that the first receiving station sends to the first emission website.
Preferably, above-mentioned the first control module 20, concrete being used for obtains the transmit power level that it adopts by the reservation acknowledgement frame of intercepting the transmission of the first receiving station, this reservation acknowledgement frame received power level that receives with self relatively calculates the path loss between self place website and the first receiving station; Wherein, the information that comprises the transmit power level that current reservation acknowledgement frame adopts in the frame head of the reservation acknowledgement frame that sends of the first receiving station.
Preferably, above-mentioned the first control module 20, when also being used for receiving the reservation acknowledgement frame that the first receiving station replys to the first emission website, according to the first receiving station that carries in the reservation acknowledgement frame that receives employed transmitting power in Frame is replied, determine that the first receiving station is to the interference level of website under self; Determine that according to the interference level of determining the transmitting power of the minimum requirements that targeted sites is used to reply and modulation coding mode make up, transmitting power and modulation coding mode combination for the minimum requirements of replying that control data transmission blocks 40 will be determined offer targeted sites.
Preferably, above-mentioned the second control module 30, when also being used for self place website and being sending the adjacent bus station of the second emission website of data, judge that whether the second receiving station corresponding to the second emission website be the adjacent bus station of self place website, when the second receiving station is not the adjacent bus station of self place website, carry out again control data transmission blocks 40 sends Frame to targeted sites in the second emission website sends time period of Frame step.
Preferably, above-mentioned the second control module 30, concrete being used for known the second receiving station corresponding to described the second emission website from the Frame that described the second emission website that receives sends; By whether listening to the mac frame that the second receiving station sends, judge whether the second receiving station is the adjacent bus station of self; Perhaps, the adjacent bus station that comprises in the adjacent bus station tabulation with the second receiving station and self maintained mates, and judges whether the second receiving station is the adjacent bus station of self.
Preferably, above-mentioned the second control module 30, concrete being used for before the second emission website is sending data, when coming channel reservation by collision-avoidance mechanism first, by whether listening to the reservation acknowledgement frame that is used for realizing channel reservation that the second receiving station sends, judge whether the second receiving station is the adjacent bus station of self.
Preferably, above-mentioned the second control module 30, concrete channel booking frame or the Frame that is used for sending by the second emission website obtains the duration length that the second emission website sends Frame, sends the Frame of oneself within this duration.
Data transmission method in the above-mentioned wireless network that the embodiment of the invention provides, each website can be determined according to the Frame that adjacent bus station sends the path loss of it and these websites, receiving station is consulted transmit power level with the emission website, and makes the adjacent bus station of receiving station send Frame with low power level; The adjacent bus station of emission website can send data to other website except current emission website and current receiving station in the time slot of emission website transmission data.Cooperation by website in the network, utilize more efficiently channel, thereby mobile Ad hoc network can the be reached data throughput that significantly improves under the CSMA/CA mechanism and the data transmission delay that significantly reduces, and can make between the website of mobile Ad hoc network can more coordinate, more work in robust ground.
Should be understood that the particular order of the step in the disclosed process or the example that level is illustrative methods.Based on design preference, should be appreciated that the particular order of the step in the process or level can be rearranged in the situation that does not break away from protection range of the present disclosure.Appended claim to a method has provided the key element of various steps with exemplary order, and is not to be limited to described particular order or level.
In above-mentioned detailed description, various features are combined in the single embodiment together, to simplify the disclosure.This open method should be interpreted as reflecting such intention, that is, and the more feature of feature that the embodiment of theme required for protection need to clearly be stated in each claim.On the contrary, as appending claims reflected, the present invention was in the state that lacks than whole features of disclosed single embodiment.Therefore, appending claims clearly is merged in the detailed description hereby, and wherein every claim is alone as the independent preferred embodiment of the present invention.
Those skilled in the art it is also understood that various illustrative box, module, circuit and the algorithm steps in conjunction with the embodiment description of this paper all can be embodied as electronic hardware, computer software or its combination.For the interchangeability between the hardware and software clearly is described, the above has all carried out usually describing around its function to various illustrative parts, frame, module, circuit and step.Be embodied as hardware or be embodied as software as for this function, depend on specific application and the design constraint that whole system is applied.Those skilled in the art can be for each application-specific, realizes described function in the mode of accommodation, and still, this realization decision-making should not be construed as and deviates from protection range of the present disclosure.
Realize that for software the technology of describing among the application can realize with the module (for example, process, function etc.) of carrying out the described function of the application.These software codes can be stored in memory cell and be carried out by processor.Memory cell can be implemented in the processor, also can be implemented in outside the processor, and under latter event, it is coupled to processor by correspondence via various means, and these all are well known in the art.
Description above comprises giving an example of one or more embodiment.Certainly, all possible combination of describing parts or method in order to describe above-described embodiment is impossible, but those of ordinary skills should be realized that each embodiment can do further combinations and permutations.Therefore, the embodiment that describes herein is intended to contain all the such changes, modifications and variations in the protection range that falls into appended claims.In addition, " comprise " with regard to the term that uses in specification or claims, the mode that contains of this word is similar to term and " comprises ", just as " comprising, " in the claims as link word explain like that.In addition, using any one term " perhaps " in the specification of claims is to represent " non-exclusionism or ".

Claims (19)

1. the data transmission method in the wireless network is characterized in that, comprising:
When the website in the wireless network has Frame to be sent;
If the website in the described wireless network is just at the adjacent bus station of the first receiving station of receive data, interference level according to the acceptable adjacent bus station of the first receiving station, and the path loss between self and the first receiving station, determine self spendable maximum transmission power, adopt the transmitting power that is not more than described spendable maximum transmission power to send Frame to targeted sites; And/or
If the website in the described wireless network is the adjacent bus station that is sending the second emission website of data, within the time period of the second emission website transmission Frame, send Frame to targeted sites.
2. the method for claim 1 is characterized in that, the process of the interference level of the acceptable adjacent bus station of station for acquiring the first receiving station in the described wireless network specifically comprises:
The information that comprises the interference level of the acceptable adjacent bus station of the first receiving station in the reservation acknowledgement frame that the first receiving station sends to the first emission website of correspondence;
Website in the described wireless network obtains the interference level of described acceptable adjacent bus station to the reservation acknowledgement frame of the first emission website transmission by receiving the first receiving station.
3. method as claimed in claim 2 is characterized in that, the first receiving station is determined the mode of the interference level of acceptable adjacent bus station, specifically comprises:
The first receiving station calculates the interference level of its acceptable adjacent bus station according to the transmitting power of the current use of the first emission website and the combination of modulation coding mode; Perhaps,
The first receiving station is determined the interference level of acceptable adjacent bus station, determine the first emission website in the transmitting power and the modulation coding mode combination that after this send the minimum requirements that data will use according to the interference level of described acceptable adjacent bus station, and in the reservation acknowledgement frame, the transmitting power of the minimum requirements determined and modulation coding mode combination are sent to first and launch website.
4. the method for claim 1 is characterized in that, the website in the described wireless network is determined the process of the path loss between self and the first receiving station, specifically comprises:
The information that comprises the transmit power level that current reservation acknowledgement frame adopts in the reservation acknowledgement frame that the first receiving station sends;
Website in the described wireless network obtains the transmit power level that it adopts by the reservation acknowledgement frame of intercepting the transmission of the first receiving station, this reservation acknowledgement frame received power level that receives with self relatively calculates website in the described wireless network and the path loss between the first receiving station.
5. the method for claim 1 is characterized in that, the website in the described wireless network is that the process that targeted sites is replied the website in the described wireless network specifically comprises when sending the adjacent bus station of the first receiving station of data:
Website in the described wireless network determines that according to the employed transmitting power of the first receiving station described the first receiving station is to the interference level of self;
Determine the transmitting power of the minimum requirements that targeted sites is used to reply and the combination of modulation coding mode according to described interference level, the transmitting power of definite described minimum requirements be used to replying and the combination of modulation coding mode are sent to targeted sites;
The targeted sites use is not less than the transmitting power of above-mentioned minimum requirements and the combination of modulation coding mode is replied the Frame that the website in the described wireless network sends.
6. the method for claim 1 is characterized in that, the website in the described wireless network be sending data second the emission website adjacent bus station the time, also comprise:
Website in the described wireless network judges whether the second receiving station corresponding to described the second emission website is the adjacent bus station of self, when the second receiving station is not the adjacent bus station of self, carry out again the step that within the time period of the second emission website transmission Frame, sends Frame to targeted sites.
7. method as claimed in claim 6 is characterized in that, the website in the described wireless network judges that whether the second receiving station is the adjacent bus station of self, specifically comprises:
Website in the described wireless network is known the second receiving station corresponding to described the second emission website from the Frame that described the second emission website that receives sends;
Website in the described wireless network judges by whether listening to the Frame that the second receiving station sends whether the second receiving station is the adjacent bus station of self; Perhaps, the adjacent bus station and the second receiving station that comprise in the adjacent bus station tabulation with self maintained mate, and judge whether the second receiving station is the adjacent bus station of self.
8. method as claimed in claim 7 is characterized in that, the website in the described wireless network judges that by whether listening to the Frame that the second receiving station sends whether the second receiving station is the adjacent bus station of self, specifically comprises:
Before the second emission website is sending data, when coming channel reservation by collision-avoidance mechanism first, described website judges by whether listening to the reservation acknowledgement frame that is used for realizing channel reservation that the second receiving station sends whether the second receiving station is the adjacent bus station of self.
9. the method for claim 1 is characterized in that, describedly sends Frame to targeted sites in the second emission website sends time period of Frame, specifically comprises:
The channel booking frame or the Frame that send by the second emission website obtain the duration length that the second emission website sends Frame, send the Frame of oneself within this duration.
10. the data transmission device in the wireless network is characterized in that, comprising: obtain determination module, the first control module, the second control module and data transmission blocks;
The described determination module that obtains is when having Frame to be sent for website under self; If website is just to notify described the first control module at the adjacent bus station of the first receiving station of receive data under self, if and/or under self website be that the adjacent bus station that is sending the second emission website of data is notified described the second control module;
Described the first control module, be used for the interference level according to the acceptable adjacent bus station of the first receiving station, and the path loss between self and the first receiving station, determine self affiliated spendable maximum transmission power of website, control described data transmission blocks and adopt the transmitting power that is not more than described spendable maximum transmission power to send Frame to targeted sites;
Described the second control module was used for controlling described data transmission blocks and sends Frame to targeted sites within the time period of the second emission website transmission Frame;
Described data transmission blocks is used for sending Frame to be sent to targeted sites.
11. device as claimed in claim 10 is characterized in that, described the first control module specifically is used for:
Obtain the information of the interference level of described acceptable adjacent bus station to the reservation acknowledgement frame of the first emission website transmission of correspondence by receiving the first receiving station; Wherein, the information that comprises the interference level of the acceptable adjacent bus station of the first receiving station in the reservation acknowledgement frame that the first receiving station sends to the first emission website.
12. device as claimed in claim 11 is characterized in that, described the first control module specifically is used for:
Obtain the transmit power level that it adopts by intercepting the reservation acknowledgement frame that the first receiving station sends, this reservation acknowledgement frame received power level comparison that receives with self calculates the path loss between self place website and the first receiving station; Wherein, the information that comprises the transmit power level that current reservation acknowledgement frame adopts in the reservation acknowledgement frame that the first receiving station sends.
13., it is characterized in that described the first control module also is used for such as the arbitrary described device of claim 10-12:
When receiving the reservation acknowledgement frame that the first receiving station replys to the first emission website, according to the employed transmitting power of the first receiving station of carrying in the described reservation acknowledgement frame, determine that described the first receiving station is to the interference level of website under self;
Determine that according to described interference level targeted sites is used for the transmitting power of minimum requirements and the modulation coding mode combination of immediate acknowledgment, transmitting power and the modulation coding mode combination of the described minimum requirements for immediate acknowledgment of controlling that described data transmission blocks will determine offer targeted sites.
14. device as claimed in claim 10 is characterized in that, described the second control module also is used for:
Self place website is when sending the adjacent bus station of the second emission website of data, judge that whether the second receiving station corresponding to described the second emission website be the adjacent bus station of self place website, when the second receiving station is not the adjacent bus station of self place website, carry out again the described data transmission blocks of control sends Frame to targeted sites in the second emission website sends time period of Frame step.
15. device as claimed in claim 14 is characterized in that, described the second control module specifically is used for:
From the Frame that described the second emission website that receives sends, know the second receiving station corresponding to described the second emission website; By whether listening to the Frame that the second receiving station sends, judge whether the second receiving station is the adjacent bus station of self; Perhaps, the adjacent bus station and the second receiving station that comprise in the adjacent bus station tabulation with self maintained mate, and judge whether the second receiving station is the adjacent bus station of self.
16. device as claimed in claim 15 is characterized in that, described the second control module specifically is used for:
Before the second emission website is sending data, when coming channel reservation by collision-avoidance mechanism first, by whether listening to the reservation acknowledgement frame that is used for realizing channel reservation that the second receiving station sends, judge whether the second receiving station is the adjacent bus station of self.
17. device as claimed in claim 10 is characterized in that, described the second control module specifically is used for:
The channel booking frame or the Frame that send by the second emission website obtain the duration length that the second emission website sends Frame, send the Frame of oneself within this duration.
18. the communication site in the wireless network is characterized in that, comprises arbitrary described data transmission device such as claim 10-17.
19. the data transmission system in the wireless network is characterized in that, comprises at least two communication sites as claimed in claim 18.
CN201210119039.6A 2012-04-20 2012-04-20 Data transmission method, system and device in a kind of wireless network Active CN103379549B (en)

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