CN101106399B - Self-adapted distributed power control method - Google Patents
Self-adapted distributed power control method Download PDFInfo
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- CN101106399B CN101106399B CN2007100448997A CN200710044899A CN101106399B CN 101106399 B CN101106399 B CN 101106399B CN 2007100448997 A CN2007100448997 A CN 2007100448997A CN 200710044899 A CN200710044899 A CN 200710044899A CN 101106399 B CN101106399 B CN 101106399B
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Abstract
The invention relates to a self-adaptive distributed power control method in the telecommunication technology field. The method comprises the steps: first, the initialization to parameters of a wireless customer station and a wireless access point; second, the selection of the wireless access point, and establishment of the connection; third, the calculation of the anticipated throughput of the wireless access point; fourth, the startup of a timer with one-week triggering cycle; fifth, the actual throughput of the wireless access point within one cycle; sixth, the comparison of the actual throughput with the anticipated throughput of the wireless access point one cycle later to confirm whether to increase or reduce the transmission powder of the wireless access point; seventh, the regulated transmission powder value of each wireless access point is written on a configuration file, facilitating the read of the next iteration; eighth, the new iteration. With the fast convergence speed, the invention enhances the network resource utilization efficiency and decreases the calculation complexity.
Description
Technical field
What the present invention relates to is the method in a kind of telecommunication technology field, specifically is a kind of self-adapted distributed power control method.
Background technology
To be IEEE released in 1997 IEEE 802.11, works in the 2.4GHz frequency range, is the standard of more popular WLAN (wireless local area network).Along with the increase with the wireless local reticular density of increasing of wireless access points (AP), finite wireless resources and reasonably distributing and the multiplexing hot issue that becomes in the WLAN (wireless local area network) research.Power control then is one of them important branch.Study the more cellular network that all is based on, up terminal realizes power control by the requirement that comprises transmitting power in dateout before.In IEEE 802.11 WLAN (wireless local area network), data all are to transmit in single shared channel.In the tactic pattern of WLAN (wireless local area network), comprise basic Basic Service Set, independent basic service set.The basis basic service is concentrated and is contained wireless access points, and more advantage is arranged aspect network insertion.The related content that in IEEE 802.11, does not have power control, so the transmitting power of each wireless access points all is set to maximum, when the distribution density of wireless access points is bigger, will inevitably cause the phase mutual interference between the wireless access points, and influence the performance at aspects such as throughputs of whole network.Have in the research of the relevant power control of IEEE 802.11 WLAN (wireless local area network) at present much is that modification by to the medium access control sublayer agreement realizes.
Retrieval through the prior art document is found, among " the Balancing the Hidden and ExposedNode Problems With Power Control In CSMA/CA-Based Wireless Networks " that Yihong Zhou etc. delivers (" hiding and expose the method for website problem in based on the wireless network of conflict evading mechanism by power control balance ") new medium access control protocol is proposed in " IEEE CommunicationSociety " (ieee communication association) 2005, this method at first provides the notion of three transmission ranges: range of transmission, the carrier sense scope, interference range, by adopting request transmission/permission to send agreement, transmitting terminal uses maximum transmission power to send request and sends packet, receiving terminal sends with maximum power equally after the request of receiving sends packet and allows to send packet, transmitting terminal is according to receiving performance number and the maximum transmission power that allows to send packet, calculate the ideal transmitting power value, and use this ideal power value to send packet, and receiving terminal also send the affirmation packet to transmitting terminal with this ideal transmission power value after successfully having received packet.Definite mode of this ideal transmitting power value is: the carrier sense scope of transmitting terminal can cover the interference range of receiving terminal just.Can obtain a kind of balance like this, not only reduce the hiding website while to greatest extent but also reduce the exposure website as much as possible, thereby improve the throughput of whole network.In this method, used the parameter interference range, and this interference range being the function of distance between transmitting terminal and the receiving terminal, and in the application of reality, is to know distance between the two.This method is a kind of improvement to existing 802.11 medium access control protocols.The workload of obvious this method is big, and does not possess versatility on the hardware platform of reality.Have only the medium access control protocol after improvement is all used at the wireless access points of all networkings and wireless client station, this method just can be applied; Next adjusts the method for transmitted power at each packet, under the situation of high data rate, must influence the performance of system.
Summary of the invention
The objective of the invention is deficiency at the prior art existence, a kind of self-adapted distributed power control method is provided, make it need not to know distance between wireless access points and the wireless client station, need not to revise existing medium access control protocol, wireless access points need not to send packet at each and recomputates the transmitting power of self in one-period, each wireless access points is determined the transmitting power that it is new according to the disposition of himself load in one-period, has good performance aspect throughput that improves network integral body and the realization covering.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
Step 1, to wireless client station and each parameter initialization of wireless access points;
At first each parameter is carried out initialization, parameter initialization comprises two aspects:
(1) operating frequency of each wireless client station and wireless access points, the channel of work: the operating frequency of all wireless client stations and wireless access points is 2.4G, is operated on the same channel;
(2) transmitting power of each wireless access points: it is set to the minimum value in the wireless access points adjustable power scope among the present invention.
Iteration begins after step 2, the parameter initialization, and wireless access points is selected at each wireless client station, and connects with it;
Each wireless client station is selected wireless access points according to certain foundation, and is connected with it according to the transmitting power of wireless access points around being listened to.The foundation of selecting is: selected wireless access points, signal is the strongest in the wireless access points that the wireless client station is listened to, and this signal strength signal intensity is greater than the threshold level at wireless client station.
Described iteration is meant from each wireless client station according to the transmitting power of wireless access points and sets up and begin to write the process of configuration file end to the transmission power level that wireless access points is new being connected of wireless access points.An iteration is exactly once to use the process of new transmitting power.
At the beginning of each iteration began, each wireless client station all will be reselected wireless access points and connect, and mainly was to consider from the angle of load balancing.Because target of the present invention is exactly the optimization of overall performance of network, rather than local optimization.In the application of reality, components from being damaged is unavoidable, and certain wireless access points or certain several wireless access points break down, and the leak of the network coverage then can occur.It is too heavy also can to occur local load in addition, and promptly the throughput of some wireless access points has exceeded the situation of its upper limit that can carry.Promptly can reduce the wireless client station by load balancing as far as possible and can't obtain the probability that network insertion is served because the damage of some wireless access points or load are too heavy.
Expection throughput in step 3, the calculating wireless access points one-period;
The described cycle is from the viewpoint definition that calculates expection throughput and goodput, i.e. only the expection throughput and the goodput of wireless access points in one-period.In the present invention, each wireless access points was an one-period with 20 seconds.
Described expection throughput, be meant do not consider between the wireless access points and the wireless client station between the situation of phase mutual interference under calculate, the throughput of expection is the throughput sum at the wireless client station that is connected with this wireless access points.And the throughput at each wireless client station multiply by the cycle for the generation speed of the packet at this wireless client station.
Step 4, startup timer, the triggering cycle of timer is the described one-period of step 3;
Described timer, the time monitoring in the goodput process of responsible wireless access points.
Step 5, under the monitoring of the described timer of step 4, the goodput of the wireless access points in one-period;
Described goodput is meant in one-period, the summation of the affirmation packet that the coupled wireless client station that wireless access points successfully receives is returned.
Step 6, one-period finish, and the goodput and the expection throughput of wireless access points compared, and according to result relatively, judgement is increase the transmitting power of wireless access points or reduce transmitting power, and concrete basis for estimation is:
A) when the expection throughput of the expection throughput-goodput＞wireless access points of wireless access points * surplus, promptly decidable is in system's running, and wireless access points can not be handled the load of himself fully.Cause this result to mainly contain two reasons: the transmitting power of (1) wireless access points is excessive, wireless client station in the coverage of this transmitting power correspondence is too many and cause the load of wireless access points to reach saturated, promptly the expection throughput of wireless access points near or surpassed the bandwidth of system; (2) transmitting power of wireless access points is too big, has the overlapping region between the coverage of its pairing coverage and other wireless access points.Be in the influence that the wireless client station in this overlapping region may be subjected to hiding website and expose the website phenomenon, thereby cause correctly to receive the packet that wireless access points sends.Therefore, should reduce the transmitting power of wireless access points this moment, thereby reduce the coverage of wireless access points, in reason (1), reduce the quantity at the wireless client station in the wireless access points coverage, alleviate the load of wireless access points; The influence of hiding website and exposing the website phenomenon is reduced in overlapping region in reason (2) between the coverage of minimizing wireless access points, thus the throughput of raising network integral body.
B) when the expection throughput of the expection throughput-goodput≤wireless access points of wireless access points * surplus, promptly decidable is in system's running, and wireless access points can be handled the load of himself fully.Promptly, in this case, then increase the transmitting power of wireless access points no matter be that channel quality or load capacity aspect can both meet the demands.Increase transmitting power and can attempt covering more wireless client station, improve utilization rate of network resource, satisfy the network insertion demand at wireless client station.When load occurring unbalanced the time, promptly the load of some wireless access points has surpassed the upper limit of its throughput that can carry, and the load of remaining wireless access points really is far from reaching the upper limit of its bearing capacity.According to criterion a), heavy duty wireless access points can reduce transmitting power, and underload person then increases its transmitting power.The wireless client station that exceed heavy duty wireless access points coverage this moment promptly can obtain the access service that original underload person provides.When certain wireless access points broke down, the wireless client around it stood in and also can obtain the network insertion service that the adjacent underloaded wireless access points that has enlarged coverage provides on the original position.
When determining basis for estimation, the present invention with the expection throughput 5% as surplus, the purpose of doing like this is in order to realize convergence as soon as possible.
Step 7, each wireless access points write configuration file with its adjusted transmission power level, read when being convenient to a new iteration;
Step 8, forward step 2 to, carry out new iteration once.
Compared with prior art, the present invention does not relate to the information interaction between the wireless access points, each wireless access points is to carry out distributed power control according to the characteristics of the throughput of self fully, fast convergence rate of the present invention, simultaneously because need not to be provided with control centre, reduce extra information interaction, thereby improved utilization efficiency of network resources, reduced the complexity of calculating.The transmitting power with all wireless access points all be set to its transmitting power adjustable extent in limited time, the goodput of wireless access points is 25509 packets, and the throughput of network integral body is 29135 packets among the present invention, and network throughput has improved 14.2%.
Description of drawings
Fig. 1 schematic flow sheet of the present invention;
Fig. 2 is not provided with the goodput-time relationship schematic diagram of the part wireless access points of surplus;
Fig. 3 is provided with the goodput-time relationship schematic diagram of the part wireless access points of surplus;
It is the result of implementation schematic diagram of 50K/S that the packet at each wireless client station of Fig. 4 produces speed;
It is 50K/S that the packet at each wireless client station of Fig. 5 produces speed, has closed the result of implementation schematic diagram that is numbered 21,23,27 wireless access points simultaneously.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
In the present embodiment, it is the broadband router of WRT54G that wireless access points adopts model, is produced by Linksys company, supports 802.11b and 802.11g pattern; The wireless client station is general wireless terminal, follows 802.11 standards.
Present embodiment is achieved through the following technical solutions, as shown in Figure 1, present embodiment comprise the steps into:
Step 1, to wireless client station and each parameter initialization of wireless access points.
1) schematic diagram of the scene of present embodiment is provided with 28 wireless access points as shown in Figure 4 altogether in this scene, and 20 wireless client stations distribute around each accessing wirelessly website.
The set-up mode of the concrete coordinate of each wireless access points is: per 7 wireless access points become cellular (regular hexagon) to distribute, be specially a wireless access points and be arranged on the center of circle of regular hexagon circumscribed circle, remaining six wireless access points places on the orthohexagonal summit, four adjacent layouts of regular hexagon.200m scope 20 the wireless client stations that distribute randomly around each wireless access points.
2) operating frequency with wireless access points and wireless client station all is set to 2.4G, and is operated on the channel 1; The transmitting power of wireless access points all is set to minimum value in its transmitting power adjustable extent.
An iteration begins after step 2, the parameter initialization, and each wireless client station is selected wireless access points according to certain foundation, and connected with it according to the transmitting power of wireless access points around being listened to.The foundation of selecting is: selected wireless access points, in the wireless access points that the wireless client station is listened to, its signal is the strongest, and this signal strength signal intensity is greater than the threshold level at wireless client station.
Step 3, calculate the expection throughput in each wireless access points one-period, one-period is 20 seconds, and expection throughput calculation formula is in the present embodiment:
a
iThe packet that is i wireless client station produces speed, and unit is bps; Each length of data package at i wireless client station is l
iByte; Variable n represents to be connected to the quantity at the wireless client station of certain wireless access points.
Step 4, startup timer, this can realize by the mode of software interrupt.The purpose that timer is set is control cycle, triggering cycle of timer is decided to be the time of one-period.When beginning to communicate by letter between wireless access points and the wireless client station, start timer, when timer triggers, produce software interrupt, stop counting the affirmation packet that receives.
In step 5, the process of between wireless access points and wireless client station, communicating by letter, the goodput of wireless access points in one-period.In case the connection between wireless access points and the wireless client station is set up, and can begin the communication between wireless access points and the wireless client station.Counter is set on wireless access points, and when confirming packet for one that successfully receives the transmission of wireless client station, the value of counter is from increasing 1.
Step 6, be that the value of counter and the expection throughput of calculating compare with goodput, according to comparing result, each wireless access points calculates the transmitting power of next iteration correspondence respectively.When the expection throughput of the expection throughput-goodput＞wireless access points of wireless access points * 5%, reduce transmitting power; When the expection throughput of the expection throughput-goodput≤wireless access points of wireless access points * 5%, increase transmitting power.The coverage of each adjusted transmitting power correspondence increases 10 meters or reduce 10 meters with respect to the coverage of transmitting power correspondence before adjusting.Adjust behind the power counter O reset.
Step 7, the adjusted transmission power level of each wireless access points is write configuration file, call when being convenient to next iteration.
Step 8, forward step 2 to, enter the iteration of a new round.
The result of present embodiment as shown in Figure 2, be that the schematic diagram of the goodput of part wireless access points in 9 wireless access points (AP0, AP3, AP4, AP8, AP9, AP14, AP15, AP16, AP17) of surplus with the variation of iterations is not set, AP is meant wireless access points; As shown in Figure 3, be to be provided with the schematic diagram of the goodput of part wireless access points in 9 wireless access points (AP0, AP3, AP4, AP8, AP9, AP14, AP15, AP16, AP17) of surplus with the variation of iterations.By both contrasts, find the former after having carried out 100 iteration, actual throughput still is in the significantly change, realize convergence, and the latter is promptly realizing convergence through 20 iteration.The necessity that surplus reasonably is set in application promptly is described thus.
As shown in Figure 4, all equal operate as normal of wireless access points; As shown in Figure 5, closed in an embodiment and be numbered AP21, AP23, three wireless access points of AP27.It is all identical that packet in these two kinds of scenes produces speed.By contrast, find behind the wireless access points of having closed part, be in the network insertion service that wireless access points that wireless client station around the wireless access points of having closed obtained being numbered AP22 provides.
Present embodiment can effectively be realized load balancing, reduces the wireless client station can't obtain the incident generation of network insertion because of the fault of wireless access points probability as far as possible.
Claims (8)
1. a self-adapted distributed power control method is characterized in that, comprises the steps:
Step 1, to wireless client station and each parameter initialization of wireless access points;
Iteration begins after step 2, the parameter initialization, and wireless access points is selected at each wireless client station, and connects with it;
Expection throughput in step 3, the calculating wireless access points one-period;
Step 4, startup timer, the triggering cycle of timer is the described one-period of step 3;
Step 5, in one-period, monitor the goodput of wireless access points at the described timer of step 4;
Step 6, one-period finish, and the goodput and the expection throughput of wireless access points compared, and according to result relatively, judgement is increase the transmitting power of wireless access points or reduce transmitting power;
Described judgement is increase the transmitting power of wireless access points or reduce transmitting power, its basis for estimation is: when the result who deducts goodput when the expection throughput of wireless access points multiply by surplus greater than the expection throughput of wireless access points, reduce the transmitting power of wireless access points; When the result who deducts goodput when the expection throughput of wireless access points multiply by surplus smaller or equal to the expection throughput of wireless access points, increase the transmitting power of wireless access points;
Described surplus is 5% of the expection throughput;
Step 7, each wireless access points write configuration file with its adjusted transmission power level, read when being convenient to a new iteration;
Step 8, forward step 2 to, carry out new iteration once.
2. self-adapted distributed power control method according to claim 1, it is characterized in that, described iteration, be meant: set up according to the transmitting power of wireless access points from each wireless client station and begin to write the process of configuration file end to the transmission power level that wireless access points is new being connected of wireless access points, an iteration is exactly once to use the process of new transmitting power.
3. self-adapted distributed power control method according to claim 1 is characterized in that, in the described cycle, is meant: each wireless access points was an one-period with 20 seconds.
4. self-adapted distributed power control method according to claim 1 is characterized in that, in the step 1, described parameter initialization is specially:
(1) operating frequency of all wireless client stations and wireless access points is 2.4G, is operated on the same channel;
(2) transmitting power of each wireless access points is set to the minimum value in the wireless access points adjustable power scope.
5. self-adapted distributed power control method according to claim 1, it is characterized in that, in the step 2, described connecting, its foundation of selecting to connect is: selected wireless access points, signal is the strongest in the wireless access points that the wireless client station is listened to, and this signal strength signal intensity is greater than the threshold level at wireless client station.
6. self-adapted distributed power control method according to claim 1, it is characterized in that, in the step 3, described expection throughput be do not consider between the wireless access points and the wireless client station between the situation of phase mutual interference under calculate, the expection throughput is the throughput sum at the wireless client station that is connected with this wireless access points, and the throughput at each wireless client station multiply by the cycle for the generation speed of the packet at this wireless client station.
7. according to claim 1 or 6 described self-adapted distributed power control methods, it is characterized in that, in the step 3, described expection throughput, its computing formula is:
a
iThe packet that is i wireless client station produces speed, and unit is bps; Each length of data package at i wireless client station is l
iByte; Variable n represents to be connected to the quantity at the wireless client station of certain wireless access points.
8. self-adapted distributed power control method according to claim 1, it is characterized in that, in the step 5, described goodput is meant in one-period, the summation of the affirmation packet that the coupled wireless client station that wireless access points successfully receives is returned.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102594835A (en) * | 2012-03-12 | 2012-07-18 | 北京建飞科联科技有限公司 | Real name authentication method and authentication platform of wireless networks in a wide range of public places |
| CN102781087B (en) * | 2012-07-31 | 2015-11-25 | 福建星网锐捷网络有限公司 | Transmission power adjustment method, device and access device |
| CN103916946B (en) * | 2013-01-04 | 2017-11-21 | 中国移动通信集团公司 | The method of adjustment and device of portable wireless gateway transmission power |
| US9225396B2 (en) * | 2013-02-15 | 2015-12-29 | Intel Corporation | Apparatus, system and method of transmit power control for wireless communication |
| CN103974403B (en) * | 2014-04-11 | 2018-03-13 | 广州杰赛科技股份有限公司 | The Poewr control method and system of wireless terminal access point |
| CN105099837A (en) * | 2014-05-23 | 2015-11-25 | 中兴通讯股份有限公司 | Wired general medium networking technology networking method and apparatus for home network |
| CN105282127A (en) * | 2014-07-25 | 2016-01-27 | 深圳市携网科技有限公司 | Wifi authentication server and authentication method |
| CN112491573B (en) * | 2019-09-12 | 2023-07-18 | 华为技术有限公司 | Network parameter configuration method and device |
| EP4020892A4 (en) | 2019-09-12 | 2022-10-19 | Huawei Technologies Co., Ltd. | Network parameter configuration method and apparatus |
| CN115734327A (en) * | 2021-08-31 | 2023-03-03 | 华为技术有限公司 | Downlink power control method and device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1918813A (en) * | 2004-03-08 | 2007-02-21 | 英特尔公司 | Adaptive transmit power control in wireless devices |
| CN101013912A (en) * | 2007-02-05 | 2007-08-08 | 北京邮电大学 | Power control method for centralized wireless multihop access network |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1918813A (en) * | 2004-03-08 | 2007-02-21 | 英特尔公司 | Adaptive transmit power control in wireless devices |
| CN101013912A (en) * | 2007-02-05 | 2007-08-08 | 北京邮电大学 | Power control method for centralized wireless multihop access network |
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