CN101110618A - Distributed associating power control method - Google Patents
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- CN101110618A CN101110618A CNA2007100423097A CN200710042309A CN101110618A CN 101110618 A CN101110618 A CN 101110618A CN A2007100423097 A CNA2007100423097 A CN A2007100423097A CN 200710042309 A CN200710042309 A CN 200710042309A CN 101110618 A CN101110618 A CN 101110618A
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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
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- 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
A distributed combined power control method in the technical field of telecommunication is provided. Firstly, a wireless access point ap detects network state in a coverage scope, initializes input parameters according to network state, judges its throughput details, transfers to a saturated power control mode or a unsaturated power control mode. A target power value is gained according to a power estimation method under a corresponding mode. And then, a transfer mode prevails. The transferred wireless access point ap secondly enters into an initial stage of network state observation, thus forming a cycle of wireless access point ap power control. Under conditions of saturated and unsaturated network, power adjustment of the present invention can improve throughput, promptly reflect hidden flaws due to power reduction and increase overall throughput.
Description
Technical field
What the present invention relates to is the method in a kind of telecommunication technology field, and specifically, what relate to is a kind of distributed associating power control method, is applied to the WLAN (wireless local area network) based on the IEEE802.11 agreement.
Background technology
At present based on the WLAN (wireless local area network) of IEEE802.11 protocol suite as a kind of flexible net access way, obtained quite comprehensively using, most of notebook network interface cards are the integrated wireless access function all, part portable terminal such as mobile phone, PDA (personal digital assistant) etc. has also added the module that inserts WLAN (wireless local area network), and in wireless network, the control of node power is mainly for following reason: 1, for client, the mobile device battery capacity is limited, needs conservation measures.2, for the network insertion ISP, the interference effect between the ap (WAP (wireless access point)) service quality, the strategy that need reduce to disturb; Simultaneously in large-scale wireless net as the interim establishment of fair one class, open-air access point also need conservation measures.3, the variation of network such as equipment fault should in time obtain handling.
Distributed power control advantage is that the cycle short, and reaction is fast, realizes simply, therefore can be embedded in the access point and does not need extra asset management device.In the distributed control, a member (referring to WAP (wireless access point) ap) needs the operation conditions of independent detection oneself and environmental information on every side, and makes independent decision-making.The purpose of distributed control then is to determine the independent detection of node and the performance that decision scheme can effectively improve overall network.
Find through literature search prior art, technical literature based on the RRM of IEEE802.11 protocol suite is studied channel allocation mostly, a spot of power control document all focuses on theoretic analysis, AgarwalS. wait at " Personal; Indoor and Mobile Radio Communications ", Sep/Oct 2001, propose to revise IEEE 802.11 agreements among On page (s): " the Distributed Power Control in Ad-hocWireless Networks " that delivers on the F-59-F-66 vol.2, the method that has added power control, be that each node uses different transmitting powers in the network, each node is all set up the power situation that a table writes down each neighbor node, utilize the RTS in the agreement, the CTS control messages is come the delivering power control information, and the node transmitter is chosen a value according to power control information from ten emitting power grades.Its deficiency is: their method requires to revise agreement, is difficult to be implemented in the product, does not consider the collision of RTS/CTS broadcast frame itself, and uses broadcast frame can take original just not abundant wireless bandwidth (in the WLAN (wireless local area network)).And because this method is applied to wireless self-networking (adhoc), require adjacent ap to listen to mutually, do not respond emergency situations such as equipment fault, the method for non-(group) on the same group equipment interference etc.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, propose a kind of distributed associating power control method of not revising agreement, non-exchange message and control frame, make each WAP (wireless access point) ap independent detection operation conditions such as throughput, transmit and receive power etc., by calculating and scheduling, independently make a policy.In having adopted network of the present invention, can effectively improve entire throughput, also can in time respond common burst network condition (node failure in the topology, covering leak etc.).
The present invention is achieved by the following technical solutions, the present invention at first, WAP (wireless access point) ap detects the network of coverage; Then,, judge the throughput situation of self, change the saturation mode or the unsaturation pattern of power control over to, the target power value that draws by the power forecasting method under the corresponding modes according to throughput according to the input parameter of networking situation initial method; Further, enter scheduling method, the WAP (wireless access point) ap after the scheduling reenters the initial phase of observation grid situation; At last, constituted the one-period of WAP (wireless access point) ap power control.
The network of described detection coverage, be meant: in the scanning coverage activity is arranged, the st (subscriber station) that service request is promptly arranged writes down these st and shakes, collides information such as probability at received power, packet loss, the packet delay of ap end, and sets up a data structure for each movable st.The st formation ordinary circumstance that each ap safeguarded can calculate group priority by the ordering of received power size according to the information weighting of record when going out team's operation.
When calculating group priority; received power, packet loss, delay variation, collision probability be given weighted factor respectively; the value normalization that calculates at last is exactly group priority that goes out of this st; the weighted factor is here obtained by the modeling of the target of optimizing at service quality (Qos); the realization of this method is the optimization at throughput; so the weight of received power and packet loss is bigger; if be applied to the business of this class delay sensitive of VOIP (networking telephone), the then corresponding lifting of the weight of delay variation.Decide on the business model characteristics.
The saturation mode of described power control is meant: the scheme that the throughput of ap is adopted when saturated.When ap was saturated, all st that served all were affected, and showed as throughput and did not reach rate request, when serious even can transmission rate decline to a great extent (when hiding website and exposure website situation are serious).This moment, the power adjustment of ap had dual mode:
1. the st tabulation that keeps existing service.When network does not worsen (being that network throughput also remains on saturation value), and adopt this mode when not having the priority difference of service flow between client on the upper strata.The purpose of power adjustment this moment is to reduce adjacent ap or be connected to the interference of the st of adjacent ap.Desired value obtains according to the power prediction algorithm.
2. adjust the st that power reduces service, when network impairment (have part st throughput to decline to a great extent, cause network throughput less than saturation throughput 85%), or adopt this mode when the service priority difference is arranged between the client.The purpose that reduces power is that part st is temporarily got rid of outside coverage, and the target power value of ap obtains according to power forecasting method.The st that is excluded calculates decision according to group priority that goes out of front.
The unsaturation pattern of described power control is meant: the power of taking during the throughput unsaturation of ap is adjusted scheme.During the ap unsaturation, the target of power adjustment is to reduce the energy consumption and the interference that reduces adjacent ap of ap, and the target power of ap obtains according to power forecasting method.
The method of described power prediction, be meant: to the arbitrary st in the ap service list, by the conventional value Pt of the st transmitting power of received power Pr and appointment (transmitting power of wireless client is the fixed value of factory settings usually), can calculate the propagation gain G=Pr/Pt of the link that ap and corresponding st set up, and link is symmetrical, when ap launches with power P t_opt, the signal power that st receives ap is Pr_opt=Pt_opt*G, if Pr_opt, represents then that ap can cover this st and set up link greater than the defined threshold level Rxthreshold of agreement.For each st in the tabulation, can calculate the Pt_min=Rxthreshold*Pt/Pr of a correspondence, promptly for this WAP (wireless access point) ap and subscriber station st, can set up the minimum emissive power value that the WAP (wireless access point) ap of link should get.So to all subscriber station st in this WAP (wireless access point) ap service list, this moment, ap can just in time cover this st, as to all st in the tabulation, got Pt_sev=max{Pt_min}, just can cover all st in the present service list.When the st of adjacent ap in coverage, occurring being connected to (expression has been heard this st and obtained its received power), calculate by the method for front: the transmitting power Pt_inf that under the situation that guarantees service, does not cover this st.Comprised Pt_inf on the Pt_sev meaning generally speaking, but the use of Pt_inf is different when the scheduling link will be considered to amplify ap power.
The scheduling of described power control is meant: decision ap is operated in the process of the time span t_sev on the target power value of current decision.When this target power value of ap relative last time of power adjustment result was reduction, this ap and adjacent ap service may occur and cover leak.The service leak divides three kinds of situations: 1. when upgrading st tabulation and data member thereof, and the st long-term immobilization that certain is peripheral and be excluded out service list.Service request appears in this st after the ap power reduction.2.ap new st appears outward in coverage after reducing power, and service request is arranged.3. when second kind of saturated situation of network (saturation mode of the described power control of the face that sees before) took place, ap reduced power and has disconnected link with some st, and this st is in outside the coverage when network improves.For fear of the service leak, ap should be every a period of time amplifying power, checks whether coverage has new service request (if this moment unsaturation) outward, and the time t_sev that ap works on target power is determined that by scheduling scheme amplifying power is to P_int then.The time that ap is operated on the P_int is t_lis, and this period is called the monitoring time slot.Monitoring time slot is regular length, guarantees to hear new service request.Obtain fresh target power by power forecasting method next time then, enter the t_sev time slot.
When the t_lis stage listens to a large amount of new st, illustrate that this zone has ap to break down, the ap around the fault ap can temporarily take over this zone in ensuing t_sev time slot, go to up to administrative staff and safeguard or enable standby ap.
Described scheduling scheme, it is realized in two kinds of situation:
1. the outer new business that arrives of coverage is from initiate st, and these new business are separate, and available Poisson distribution is described.
2. the outer new business that arrives of coverage is from the st that is excluded out service list because of a period of time inertia, the corresponding business that is based on the TCP/IP technology, this class business (comprises voice, the WWW business, E-mail, video, picture browsing etc.) have burst and short relevant statistical property, single information source can be described with the ON/OFF model that pareto distributes.
Period between two t_lis (comprising one of them t_lis) is called one-period T, calculate t_sev according to institute's delivery type, the feasible new business of hearing among t_lis from a long process (N*T) accounts for the P% of all new business, can be made as 95% during realization.
Compared with prior art, method of the present invention can not revised agreement, also adjust ap power under the condition of ap exchange control/information frame around the discord, the flexibility of transplanting is good, can reduce ap and ap, the interference between ap and st effectively by the power adjustment, increase the network entire throughput, proposed power control scheduling scheme simultaneously, made emergency case such as equipment fault in the timely response to network of power adjustment energy, service leak etc. based on the business statistics model.In realization, can improve 15% during the network throughput unsaturation when saturated (improve about 4%), can respond 96.3% (here because the target of setting is 95%) that covers the new business that occurs in the leak, simultaneously because the time granularity of scheduling scheme is based on the settling time of link, imperceptible oneself the terminal of people has the situation of serving or disconnecting of can not get under this time granularity, so response is timely.
Description of drawings
Fig. 1 is the inventive method flow chart
Fig. 2 is the timeslot scheduling flow chart of power control of the present invention
Fig. 3 is the simulation result of embodiment of the invention subregion
Fig. 4 is an embodiment of the invention network entire throughput simulation result
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.
As shown in Figure 1, the flow process of whole proposal: ap obtains network condition (as described above) in the coverage by initialization, through judging the pattern (saturation mode or power prediction) that enters response, determined to enter the observation phase after the target power value, the observation phase determines to be operated in the time of this target power value, amplifies ap power then and reenters initialization period.
As shown in Figure 2, the time slot allocation of the scheduling of power control: monitor time slot, length is determined, as we are defined as t_lis=20*t_ex (t_ex is the time of an ap and a signaling of the exchange of st farthest) in realizing.The service time slot, length is determined (seeing the realization of scheduling scheme) by the result of scheduling scheme.
1. each ap work t_lis (40 microsecond) time, set up data structure for each to the st that oneself sends service request, the data member of each structure comprises received power Pr, packet loss k_loss, delay variation t_lag, collision probability k_col.And press the Pr size and sort.If the st that ap listens to request is not oneself, also sets up interim data structure and preserve its Pr_oth for it.The 3rd t_sev that is saved in from now on finishes.
2. each ap judges oneself whether saturated (the Pt_sev differences of these step different situations) according to institute's requested service flow.
If it is a) saturated then check service differentiation or the throughput degradation situation whether have between st.
I. do not have service differentiation or throughput degradation, keep existing service list, adjust power to Pt_sev.
When ii. the service priority difference was arranged, minimum st calculated group priority to service priority, adjusted power to Pt_sev, corresponding business is disconnected, and exclude service list.
B) saturated if ap does not have, adjust power to Pt_sev.And, calculate the Pt_inf (if there is) in the coverage but be connected to the st of other ap.
3. calculate the operating time t_sev of current Pt_sev according to the new business arrival model of choosing (Poisson distribution and pareto ON/OFF model), adjust to this power and keep t_sev after the time, power is transferred to P_int (maximum power that ap can be transferred to), enters the t_lis time slot, jumped to for the 1st step.If ap has also preserved Pt_oth and Pt_inf (saw for the 1st step, refer to also not out of date) thereof here, then can set and monitor power is min{P_int, Pt_inf}.
To the response of new business in the service leak as shown in Figure 3, solid line is represented adjusted coverage for the first time, and dotted line represents to occur during the observation to adjust once more after the new business (hollow square) coverage after (interval T).
Whole simulation result as shown in Figure 4, transverse axis is represented the offerload (service request speed) of single st, the longitudinal axis is represented the throughput of whole network, on behalf of the ap coverage, two curves of sum-0 do not have the scene of new node (or professional) outward, and the scene of new node (or professional) appears outward in coverage behind certain adjustment power of two curve representations of sum-1.
Prove that thus power of the present invention is adjusted at network and never is saturated under the saturated conditions and can both improves throughput, and also can in time reflect, improve entire throughput simultaneously for reducing the covering leak that power causes.In realization, improve 15% during the network throughput unsaturation when saturated (improve about 4%), can respond 96% (here because the target of setting is 95%) that covers the new business that occurs in the leak, respond timely.
Claims (10)
1. a distributed associating power control method is characterized in that,
At first, WAP (wireless access point) ap detects the network of coverage;
Then,, judge the throughput situation of self, change the saturation mode or the unsaturation pattern of power control over to, the target power value that draws by the power forecasting method under the corresponding modes according to throughput according to the input parameter of networking situation initial method;
Further, enter scheduling method, the WAP (wireless access point) ap after the scheduling reenters the initial phase of observation grid situation;
At last, constituted the one-period of WAP (wireless access point) ap power control.
2. distributed associating power control method according to claim 1, it is characterized in that, the network of described detection coverage, be meant: in the scanning coverage activity is arranged, the subscriber station st that service request is promptly arranged, write down the received power of these subscriber stations st at WAP (wireless access point) ap end, packet loss, the packet delay shake, collide probabilistic information, and set up a data structure for each movable subscriber station st, the subscriber station st formation that each WAP (wireless access point) ap is safeguarded can calculate group priority by the ordering of received power size according to the information weighting of record when going out team's operation.
3. distributed associating power control method according to claim 2; it is characterized in that; when calculating group priority; to received power, packet loss, delay variation, the given weighted factor of collision probability difference; the value normalization that calculates at last is exactly group priority that goes out of this subscriber station st, and the weighted factor is here obtained by the modeling at the target of service quality optimization.
4. distributed associating power control method according to claim 1, it is characterized in that, the saturation mode of described power control, be meant: the scheme that the throughput of WAP (wireless access point) ap is adopted when saturated, when WAP (wireless access point) ap is saturated, all subscriber station st that served all are affected, and this moment, the power adjustment of WAP (wireless access point) ap had dual mode:
1. the subscriber station st tabulation that keeps existing service: when network does not worsen is that network throughput also remains on saturation value, and adopts this mode when not having the priority difference of service flow between client on the upper strata;
2. adjust power and reduce the subscriber station st served: decline to a great extent when network impairment promptly has part st throughput, cause network throughput, or adopt this mode when the service priority difference is arranged between the client less than 85% of saturation throughput.
5. distributed associating power control method according to claim 1, it is characterized in that, the unsaturation pattern of described power control, be meant: the power of taking during the throughput unsaturation of WAP (wireless access point) ap is adjusted scheme, during WAP (wireless access point) ap unsaturation, the target of power adjustment is to reduce the energy consumption of WAP (wireless access point) ap and reduce interference with adjacent WAP (wireless access point) ap, and the target power of WAP (wireless access point) ap obtains according to power forecasting method.
6. distributed associating power control method according to claim 1, it is characterized in that, the method of described power prediction, be meant: to the arbitrary subscriber station st in the WAP (wireless access point) ap service list, calculate the propagation gain G=Pr/Pt of the link that WAP (wireless access point) ap and relative users station st set up by the subscriber station st transmission power level Pt of received power Pr and appointment, thereby draw, when WAP (wireless access point) ap launches with power P t_opt, the signal power that subscriber station st receives WAP (wireless access point) ap is Pr_opt=Pt_opt*G, for each the subscriber station st in the tabulation, what make that Pr_opt equals agreement regulation accepts thresholding Rxthreshold, calculate the Pt_min=Rxthreshold*Pt/Pr of a correspondence, promptly for this WAP (wireless access point) ap and subscriber station st, can set up the minimum emissive power value that the WAP (wireless access point) ap of link should get; So to all subscriber station st in this WAP (wireless access point) ap service list, get Pt_sev=max{Pt_min}, just can cover all the subscriber station st in the present service list, when in coverage, occurring being connected to the subscriber station st of adjacent WAP (wireless access point) ap, can calculate the transmitting power Pt_inf that under the situation that guarantees existing service, is not enough to set up link with this subscriber station st with quadrat method.
7. distributed associating power control method according to claim 1, it is characterized in that, the scheduling of described power control, be meant: decision WAP (wireless access point) ap is operated in the process of the time span t_sev on the target power value of current decision, when this target power value of WAP (wireless access point) ap relative last time of power adjustment result is reduction, this WAP (wireless access point) ap and adjacent WAP (wireless access point) ap service may occur and cover leak, cover leak three kinds of situations are arranged: 1. when upgrading subscriber station st tabulation and data member thereof, the subscriber station st long-term immobilization that certain is peripheral and be excluded out service list, service request appears in this subscriber station st after WAP (wireless access point) ap power reduction; 2. new st appearred outward in coverage after WAP (wireless access point) ap reduced power, and service request is arranged; 3. network takes place when saturated, WAP (wireless access point) ap reduces power and has disconnected the stand link of st with the certain user, this subscriber station st is in outside the coverage when network improves, WAP (wireless access point) ap reduces power to current target value, and on this power grade operating time t_sev, whether amplifying power exists under the power grade of work before detecting to cover outer new business to P_int then.
8. distributed associating power control method according to claim 7, it is characterized in that, the time t_sev that WAP (wireless access point) ap is reduced to target power and maintenance is determined by scheduling scheme, amplifying power is to P_int then, the time that WAP (wireless access point) ap is operated on the P_int is t_lis, this period is called the monitoring time slot, monitoring time slot is regular length, guarantee to hear new service request, obtain fresh target power by power forecasting method next time then, enter the t_sev time slot, when the t_lis stage listens to a large amount of new subscriber station st, illustrate that this zone has WAP (wireless access point) ap to break down, the WAP (wireless access point) ap adjacent with the WAP (wireless access point) ap that breaks down can temporarily take over this zone in ensuing t_sev time slot, go to up to administrative staff and safeguard or enable standby WAP (wireless access point) ap.
9. distributed associating power control method according to claim 8 is characterized in that, described scheduling scheme, and it is realized in two kinds of situation:
1. the outer new business that arrives of coverage is from initiate st, and these new business are separate, describe with Poisson distribution;
2. the outer new business that arrives of coverage is from the st that is excluded out service list because of a period of time inertia, the corresponding business that is based on the TCP/IP technology, this class business has burst and short relevant statistical property, and single information source is described with the ON/OFF model that pareto distributes;
Period between two t_lis is called one-period T, calculates t_sev according to institute's delivery type, the feasible new business of hearing among t_lis from a long process N*T accounts for the P% of all new business.
10. distributed associating power control method according to claim 9 is characterized in that the described new business of hearing accounts for the P% of all new business in t_lis, be made as 95% now in fact.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101557618A (en) * | 2008-04-10 | 2009-10-14 | 诺基亚西门子通信有限责任两合公司 | Method for realizing seamless switching in 802.11 wireless local area network and access points thereof |
| CN102932885A (en) * | 2012-10-25 | 2013-02-13 | 清华大学 | Mobile intelligent terminal third-generation (3G) communication energy consumption and user performance experience balancing and scheduling scheme |
| CN102946629A (en) * | 2012-10-25 | 2013-02-27 | 清华大学 | Online optimal scheduling solution for tail energy consumption of 3-G communication of mobile intelligent terminal |
| CN103687031A (en) * | 2012-09-07 | 2014-03-26 | 电信科学技术研究院 | Timeslot status maintenance method and device |
| CN104125581A (en) * | 2013-04-26 | 2014-10-29 | 华为技术有限公司 | Coverage and capacity joint optimization method, device and system thereof |
| CN104768164A (en) * | 2015-04-08 | 2015-07-08 | 杭州华三通信技术有限公司 | Method and device for dynamically adjusting wireless coverage area |
| CN104812038A (en) * | 2014-01-23 | 2015-07-29 | 华为技术有限公司 | Method and device for adjusting AP (access point) transmitting power |
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| US7245592B2 (en) * | 2001-07-09 | 2007-07-17 | Koninklijke Philips Electronics N.V. | Aligning 802.11e HCF and 802.11h TPC operations |
| US7583975B2 (en) * | 2004-03-08 | 2009-09-01 | Intel Corporation | Adaptive transmit power control in wireless devices |
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| CN103687031B (en) * | 2012-09-07 | 2016-10-19 | 电信科学技术研究院 | A kind of time slot state maintaining method and device |
| CN103687031A (en) * | 2012-09-07 | 2014-03-26 | 电信科学技术研究院 | Timeslot status maintenance method and device |
| CN102946629A (en) * | 2012-10-25 | 2013-02-27 | 清华大学 | Online optimal scheduling solution for tail energy consumption of 3-G communication of mobile intelligent terminal |
| CN102946629B (en) * | 2012-10-25 | 2015-01-14 | 清华大学 | Online optimal scheduling solution for tail energy consumption of 3-G communication of mobile intelligent terminal |
| CN102932885B (en) * | 2012-10-25 | 2015-01-14 | 清华大学 | Mobile intelligent terminal third-generation (3G) communication energy consumption and user performance experience balancing and scheduling scheme |
| CN102932885A (en) * | 2012-10-25 | 2013-02-13 | 清华大学 | Mobile intelligent terminal third-generation (3G) communication energy consumption and user performance experience balancing and scheduling scheme |
| CN104125581A (en) * | 2013-04-26 | 2014-10-29 | 华为技术有限公司 | Coverage and capacity joint optimization method, device and system thereof |
| CN104125581B (en) * | 2013-04-26 | 2018-03-16 | 华为技术有限公司 | Covering and capacity combined optimization method and device, system |
| CN104812038A (en) * | 2014-01-23 | 2015-07-29 | 华为技术有限公司 | Method and device for adjusting AP (access point) transmitting power |
| CN104812038B (en) * | 2014-01-23 | 2019-01-18 | 华为技术有限公司 | A kind of AP transmission power adjustment method and device |
| CN107113639A (en) * | 2014-11-17 | 2017-08-29 | 三星电子株式会社 | Method for controlling access point to operate in a wireless communication system |
| CN104768164A (en) * | 2015-04-08 | 2015-07-08 | 杭州华三通信技术有限公司 | Method and device for dynamically adjusting wireless coverage area |
| CN104768164B (en) * | 2015-04-08 | 2019-03-15 | 新华三技术有限公司 | A kind of method and device of dynamic regulation wireless coverage |
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