CN102769912B - Message transmission method and device applied to WLAN (Wireless Local Area Network) as well as network equipment - Google Patents
Message transmission method and device applied to WLAN (Wireless Local Area Network) as well as network equipment Download PDFInfo
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- CN102769912B CN102769912B CN201210246020.8A CN201210246020A CN102769912B CN 102769912 B CN102769912 B CN 102769912B CN 201210246020 A CN201210246020 A CN 201210246020A CN 102769912 B CN102769912 B CN 102769912B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a message transmission method and device applied to a WLAN (Wireless Local Area Network) as well as network equipment. The message transmission method provided by the embodiment of the invention comprises the following steps that: after RRM (Radio Resource Management) is carried out for each time, an AP (Access Point) determines receiving sensitivity according to a minimum receiving power value and a sending power value, and receives a message according to the determined receiving sensitivity; and the AP can regulate the receiving sensitivity according to current conditions of receiving power and sending the power in real time, set the receiving sensitivity within a relatively proper range, and screen relatively multiple interference signals and relatively weak signals from user equipment, so that the receiving error package rate is reduced, and the frequency spectrum resource use ratio and the network throughput ratio can be improved.
Description
Technical field
The present invention relates to radio communication, particularly, relate to a kind of message being applied to WLAN and receive and sending method and device, the network equipment.
Background technology
IEEE (IEEE, Institute of Electrical and Electronic Engineer) original intention of 802.11 norm-settings is for family, small office applies, in this case general by single access point (AP, Access Point) transmitting power set the maximum (relevant regulations be 100mw) of Ge as reaching, receiving sensitivity is set to the minimum that can reach, also the threshold value by Received signal strength arranges to obtain low as far as possible (relevant regulations is generally-85dBm), make AP can either to user terminal (STA as much as possible like this, Station) (or being called handheld device) send signal, also comparatively faint signal can be received as much as possible, so that promotion signal coverage.
Along with the application of WIFI gets more and more, WIFI becomes the important information access mode such as office, amusement, and single AP cannot support too many user's access, and therefore AP enters the many AP epoch adopting centralized management from single AP epoch.Access occasion as meeting-place, lyceum, library high density user, the general WIFI of employing covers, and user can facilitate access network.As the meeting-place of 3000 square metres, nearly 3000 seats.Under the prerequisite that acceptable speed is experienced, can access the STA of nearly hundred for an AP, also namely the plane of 100 square metres (also namely at the area of 10 meters * 10 meters) will She Ge AP.For cellular deployment, the interval of so every platform AP is greatly about about 10 meters.
And present hand held equipment terminal, great majority only support 2.4G signal, and therefore most of scene will inevitably adopt 2.4G channel to cover.We know that the frequency spectrum resource that AP uses is limited, 2.4G frequency range as shown in Figure 1a, only have 3 independently channels, as 1,6,11 channels, have between other channel 2,3,4,5,7,8,9,10,12,13 and there is interference, these interference comprise co-channel interference, monkey chatter and clutter interference etc.In cellular deployment as shown in Figure 1 b, each community can only use 1 in 1,6,11 channels.
WIFI communication utilizes the radio wave in space to transmit reception data, at WLAN (wireless local area network) (WLAN, Wireless Local Area Network) high density user application scenarios in, because the interval between highdensity AP is too near, cause various channel disturbance larger, there is wrong bag in the data that AP reception STA will inevitably be caused to send, if the too high AP of Packet Error Rate will start retransmission mechanism, request STA retransmits the packet of makeing mistakes, and will take more frequency spectrum resource like this, reduces the availability of frequency spectrum and reduce network throughput.On the other hand, according to WIFI mechanism, AP sends the signal strength signal intensity of data front meeting detection space, namely idle-channel evaluation (CCA is carried out, Clear channel Assessment), under normal circumstances CCA threshold value is set to-85dBm, if AP testing result is the signal strength signal intensity too large (the signal power value namely detected is greater than-85dBm) in air, represent channel busy, now aloft conflict in order to avoid electric wave signal according to WIFI mechanism AP, data would not be sent, in the high density user applied environment of WLAN, because the interference between highdensity AP is larger, AP will be caused to carry out interference being detected and thinking channel busy when CCA detects, thus minimizing send opportunity, reduce the availability of frequency spectrum, reduce network throughput.
Can low to said frequencies resource utilization, that network throughput is low problem be improved by RRM (RRM, Radio Resource Management).The target of RRM is under band-limited condition, for the STA in network provides quality of service guarantee, its basic point of departure be network traffic skewness, the characteristic of channel because of channel is weak and interference and in the situations such as fluctuations, the available resources of flexible allocation and dynamic conditioning wireless transmission part and network, farthest improve wireless frequency spectrum utilance, prevent network congestion and keep signaling traffic load little as far as possible.But RRM can not improve the problem that frequency resource utilance is low, network throughput is low existed in the high density user applied environment of WLAN effectively.
Visible, under existing WLAN high density user applied environment, there is the problem that frequency resource utilance is low, network throughput is low.
Summary of the invention
In view of this, embodiments provide a kind of message being applied to WLAN and receive and sending method and device, in order to solution under existing WLAN high density user applied environment, the problem that frequency resource utilance is low, network throughput is low of existence.
Embodiment of the present invention technical scheme is as follows:
A kind of transmission method being applied to WLAN, comprise: access point AP after having carried out radio frequency resource management RRM adjustment at every turn, in the received power value receiving the signal accessed terminal from each, determine minimal detectable power value, obtained the transmission power value of AP by RRM; AP is according to described minimal detectable power value and described transmission power value determination receiving sensitivity, and the described receiving sensitivity according to determining receives message.
Be applied to a message transmitting device of WLAN, comprise: the first determining unit, for after having carried out radio frequency resource management RRM adjustment at every turn, in the received power value receiving the signal accessed terminal from each, determine minimal detectable power value; Acquiring unit, for after having carried out RRM adjustment at every turn, has obtained the transmission power value of AP by RRM; Second determining unit, for the transmission power value determination receiving sensitivity that the minimal detectable power value determined according to described first determining unit and described acquiring unit obtain; Receiving element, receives message for the receiving sensitivity determined according to described second determining unit.
A kind of network equipment, comprises the message transmitting device being applied to WLAN as above.
The embodiment of the present invention is by after having carried out RRM adjustment at every turn, AP is according to minimal detectable power value and transmission power value determination receiving sensitivity, and receive message according to the receiving sensitivity determined, AP can adjust receiving sensitivity according to the situation of current received power and transmitted power in real time, by receiving sensitivity She Ge in a comparatively suitable scope, mask more interference signal and the more faint signal carrying out user terminal, thus reduce reception Packet Error Rate, improve frequency spectrum resource utilization rate and network throughput.
Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, or understand by implementing the present invention.Object of the present invention and other advantages realize by structure specifically noted in write specification, claims and accompanying drawing and obtain.
Accompanying drawing explanation
Fig. 1 a is the frequency spectrum resource schematic diagram of 2.4G signal in prior art;
Fig. 1 b is the structural representation of cellular deployment under WLAN middle-high density user environment;
The workflow diagram being applied to the message transmitting method of WLAN that Fig. 2 a provides for the embodiment of the present invention;
The workflow diagram being applied to the preferred implementation of the message transmitting method of WLAN that Fig. 2 b provides for the embodiment of the present invention;
The process flow figure that Fig. 3 receives for message in method shown in Fig. 2 b;
The process flow figure that Fig. 4 sends for message in method shown in Fig. 2 b;
Fig. 5 is the structured flowchart being applied to the message transmitting device of WLAN embodiments provided;
Fig. 6 is the preferred structure block diagram being applied to the message transmitting device of WLAN embodiments provided.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described, should be appreciated that embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
The embodiment of the present invention is under existing WLAN high density user applied environment, and the problem that frequency resource utilance is low, network throughput is low of existence, proposes a kind of scheme of message transmissions, to solve this problem.
Below the embodiment of the present invention is described in detail.
Fig. 2 a shows the workflow diagram being applied to the message transmitting method of WLAN that the embodiment of the present invention provides, and the method comprises:
Step 21, access point AP, after having carried out RRM adjustment, determine minimal detectable power value at every turn in the received power value receiving the signal accessed terminal from each, are obtained the transmission power value of AP by RRM;
Step 22, AP, according to minimal detectable power value and transmission power value determination receiving sensitivity, receive message according to the receiving sensitivity determined.
According to said process, after having carried out RRM adjustment at every turn, AP is according to minimal detectable power value and transmission power value determination receiving sensitivity, and receive message according to the receiving sensitivity determined, AP can adjust receiving sensitivity according to the situation of current received power and transmitted power in real time, receiving sensitivity is arranged in a comparatively suitable scope, mask more interference signal and the more faint signal carrying out user terminal, thus reduce reception Packet Error Rate, improve frequency spectrum resource utilization rate and network throughput;
Preferably, the method shown in Fig. 2 a can also comprise and sends the handling process of message, as shown in Figure 2 b, on the basis of above-mentioned steps 21 and step 22, also comprises:
Step 23, AP, according to transmission power value adjustment CCA threshold value, send message according to the CCA threshold value after adjustment.
Preferably, step 22 and step 23 do not have precedence relationship.
According to said process, AP is according to transmission power value adjustment CCA threshold value, message is sent according to the CCA threshold value after adjustment, can in real time according to the situation of current transmitted power, CCA threshold value is arranged in a comparatively suitable scope, mask more interference signal, improve the probability sending data, thus improve frequency spectrum resource utilization rate and network throughput.
Particularly, from reception and transmission two aspects, the embodiment of the present invention is described below.
Fig. 3 shows the processing method that in method shown in Fig. 2 b, message receives, and as shown in Figure 3, the method comprises:
Step 31, access point AP, having carried out RRM adjustment after at every turn, are determined minimal detectable power value receiving in received power value from the signal of each access user, are obtained the transmission power value of AP by RRM; Those skilled in the art measure received power usually in units of dBm, in units of milliwatt, transmitted power is measured, the numerical value that the numerical value of the transmitted power of the expression AP herein got from RRM can convert in units of milliwatt, also the numerical value in units of dBm can be scaled, for the ease of calculating, be scaled the numerical value in units of dBm herein, concrete conversion method is prior art, repeats no more here;
Step 32, according to minimal detectable power value and transmission power value determination receiving sensitivity; Particularly, the difference of minimal detectable power value and transmission power value and the first predetermined experience adjustments value is defined as the value of receiving sensitivity, i.e. RX
level=MIN(RX
power)-TX
power-a, wherein, RX
levelfor receiving sensitivity, MIN(RX
power) be the minimal detectable power of AP, TX
powerfor the transmitted power of AP, a is the first predetermined experience adjustments value, and a plays the effect that redundancy regulates;
Such as, MIN(RX
power)=-60dBm, TX
power=0dBm, a=3dBm, then RX
level=-63dBm, determines that the value of the receiving sensitivity obtained is greater than the received power value-85dBm of system default She Ge under normal circumstances as seen;
In the process of practical application, can also determine that the formula of receiving sensitivity is out of shape according to other unit of measurement of received power and/or transmitted power to above-mentioned, the formula after distortion falls within the scope of protection of the present invention;
Step 33, AP receive message according to the receiving sensitivity determined, particularly, signal signal power being greater than to receiving sensitivity receives, and signal signal power being less than to receiving sensitivity will not receive.
In above-mentioned processing procedure, AP is using the value of the difference of minimal detectable power value and transmission power value and the first experience adjustments value as receiving sensitivity, the summation of the scope that the scope also covered by power when receiving most weak signal and transmitted power cover and redundancy adjusting range is as the range boundary of Received signal strength, can the scope that covers of the default receiving sensitivity of reduction system, thus by receiving sensitivity She Ge in a comparatively suitable scope, more interference signal and the more faint signal carrying out user terminal can be masked, thus reduce reception Packet Error Rate, improve frequency spectrum resource utilization rate and network throughput.
Fig. 4 shows the processing method that in method shown in Fig. 2 b, message sends, and as shown in Figure 4, the method comprises:
Step 41, access point AP, after having carried out RRM adjustment, obtain the transmission power value of AP at every turn by RRM;
Step 42, according to transmission power value adjustment CCA threshold value, particularly, the product got transmission power value with the second experience adjustments value preset is defined as transmitted power adjusted value, CCA threshold value and the transmitted power adjusted value preset and the 3rd predetermined adjusted value differed from as the CCA threshold value after adjusting, i.e. CCA
power=CCA '
power-b × log(TX '
power)-t, TX '
power=TX
power/ 100, wherein, CCA
powerthe CCA threshold value after adjustment, CCA '
powerbe default CCA threshold value, b is the second predetermined experience adjustments value, TX
powerthe transmitted power of the AP in units of milliwatt, log(TX '
power) be to the TX being unit with milliwatt (mw)
powerobtain the transmitted power in units of dBm after carrying out unit conversion, t is the 3rd predetermined experience adjustments value, and the span of t can be (-2,2) dBm;
Such as, CCA '
power=-80dBm, TX
power=1mw, b=5, t=0, then CCA
power=-70dBm; CCA threshold value after visible adjustment is greater than default CCA threshold value;
In the process of practical application, can also be out of shape according to the formula of other unit of measurement of transmitted power to the above-mentioned CCA of determination threshold value, the formula after distortion falls within the scope of protection of the present invention;
Step 43, AP according to after the adjustment determined CCA threshold value send message, particularly, AP judge spatial signal intensity be greater than adjustment after CCA threshold value time do not send message, AP judge spatial signal intensity be less than adjustment after CCA threshold value time transmission message.
By above-mentioned processing procedure, on the basis of the CCA threshold value of AP before the adjustment of this locality, with the product of transmitted power and experience adjustments value for adjusted value, it is the CCA threshold value after adjusting by default CCA threshold value and adjusted value and the difference of the 3rd experience adjustments value preset, CCA threshold value can be improved, thus improve the standard that AP judges channel busy, more interference signal can be masked, improve the probability sending data, frequency spectrum resource utilization rate and network throughput can be improved.
In cellular deployment scene as shown in Figure 1 b, the spacing of each AP is 10 meters, arranges 19 AP altogether, adopts method as shown in Figure 2 b, the throughput of overall network can be increased by 2 times, method as shown in Figure 2 b has significant effect in a particular application as seen.
As shown in Figure 5, the embodiment of the present invention additionally provides a kind of message being applied to WLAN and receives and dispensing device, and this device comprises:
First determining unit 51, for after having carried out RRM adjustment at every turn, has determined minimal detectable power value in the received power value receiving the signal accessed terminal from each;
Acquiring unit 52, for after having carried out RRM adjustment at every turn, has obtained the transmission power value of AP by RRM;
Second determining unit 53, is connected to the first determining unit 51 and acquiring unit 52, for the transmission power value determination receiving sensitivity that the minimal detectable power value determined according to the first determining unit 51 and acquiring unit 52 obtain;
Particularly, the second determining unit 53 is for the value that the difference of minimal detectable power value and transmission power value and the first predetermined experience adjustments value is defined as receiving sensitivity;
Receiving element 55, is connected to the second determining unit 53, receives message for the receiving sensitivity determined according to the second determining unit 53;
Fig. 6 shows the preferred enforcement structured flowchart of Fig. 5 shown device, and as shown in Figure 6, on the basis of Fig. 5 shown device, device also comprises:
3rd determining unit 54, is connected to acquiring unit 52, for the transmission power value adjustment CCA threshold value obtained according to acquiring unit 52;
Particularly, the 3rd determining unit 54 is for being defined as transmitted power adjusted value by the product of transmission power value and the second predetermined experience adjustments value; CCA threshold value and the transmitted power adjusted value preset and the 3rd predetermined experience adjustments value differed from as the CCA threshold value after adjusting;
Transmitting element 56, is connected to the 3rd determining unit 54, sends message for the CCA threshold value after the adjustment determined according to the 3rd determining unit 54.
By device as described in Figure 5, also receiving sensitivity can be arranged in a comparatively suitable scope, mask more interference signal and the more faint signal carrying out user terminal, thus reduce reception Packet Error Rate, improve frequency spectrum resource utilization rate and network throughput; By device as shown in Figure 6, CCA threshold value can also be arranged in a comparatively suitable scope, mask more interference signal, improve the probability sending data, thus improve frequency spectrum resource utilization rate and network throughput.
Preferably, device as shown in Figure 6, in the concrete process implemented, can also arrange above-mentioned functions unit according to specific needs selectively, when only needing receiving sensitivity to be arranged in a suitable scope, then arranges device as shown in Figure 5; When only needing CCA threshold value to be arranged in a rational scope, then device as described in Figure 6 only in acquiring unit 52, the 3rd determining unit 54 and transmitting element 56 are set; When needing receiving sensitivity and CCA threshold value to be all arranged in a suitable scope, device is as shown in Figure 6 set.
The embodiment of the present invention additionally provides a kind of network equipment, and this equipment comprises device as shown in Figure 5 or Figure 6, and in a particular application, this network equipment can be AP.
In sum, the embodiment of the present invention is by after having carried out RRM adjustment at every turn, AP is according to minimal detectable power value and transmission power value determination receiving sensitivity, and receive message according to the receiving sensitivity determined, AP can adjust receiving sensitivity according to the situation of current received power and transmitted power in real time, receiving sensitivity is arranged in a comparatively suitable scope, mask more interference signal and the more faint signal carrying out user terminal, thus reduce reception Packet Error Rate, improve frequency spectrum resource utilization rate and network throughput; AP is according to transmission power value adjustment CCA threshold value, message is sent according to the CCA threshold value after adjustment, can in real time according to the situation of current transmitted power, CCA threshold value is arranged in a comparatively suitable scope, mask more interference signal, improve the probability sending data, thus improve frequency spectrum resource utilization rate and network throughput.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (7)
1. be applied to a message transmitting method of WLAN, it is characterized in that, comprising:
Access point AP, having carried out radio frequency resource management RRM adjustment after at every turn, is determined minimal detectable power value, is obtained the transmission power value of AP by RRM in the received power value receiving the signal accessed terminal from each;
The difference of described minimal detectable power value and described transmission power value and the first predetermined experience adjustments value is defined as the value of receiving sensitivity, the described receiving sensitivity according to determining receives message.
2. method according to claim 1, is characterized in that, described method also comprises:
AP, according to described transmission power value adjustment idle-channel evaluation CCA threshold value, sends message according to the CCA threshold value after adjustment.
3. method according to claim 2, is characterized in that, AP, according to described transmission power value adjustment idle-channel evaluation CCA threshold value, specifically comprises:
Transmitted power adjusted value is defined as by the product of described transmission power value and the second predetermined experience adjustments value;
Using the CCA threshold value preset and the difference of described transmitted power adjusted value and the 3rd predetermined experience adjustments value as the CCA threshold value after described adjustment.
4. be applied to a message transmitting device of WLAN, it is characterized in that, comprising:
First determining unit, for after having carried out radio frequency resource management RRM adjustment at every turn, has determined minimal detectable power value in the received power value receiving the signal accessed terminal from each;
Acquiring unit, for after having carried out RRM adjustment at every turn, has obtained the transmission power value of AP by RRM;
Second determining unit, the transmission power value obtained for the minimal detectable power value described first determining unit determined and described acquiring unit and the difference of the first predetermined experience adjustments value are defined as the value of receiving sensitivity;
Receiving element, receives message for the receiving sensitivity determined according to described second determining unit.
5. device according to claim 4, is characterized in that, described device also comprises:
3rd determining unit, for the transmission power value adjustment idle-channel evaluation CCA threshold value obtained according to described acquiring unit;
Transmitting element, sends message for the CCA threshold value after the adjustment determined according to described 3rd determining unit.
6. device according to claim 5, is characterized in that, described 3rd determining unit, specifically for:
Transmitted power adjusted value is defined as by the product of described transmission power value and the second predetermined experience adjustments value;
Using the CCA threshold value preset and the difference of described transmitted power adjusted value and the 3rd predetermined experience adjustments value as the CCA threshold value after described adjustment.
7. a network equipment, is characterized in that, comprises the message transmitting device being applied to WLAN according to any one of claim 4 to 6.
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