CN101340264B - Method and system for optimal allocation of uplink transmission power in communication networks - Google Patents

Abstract

Disclosed is a method for determining transmission power for a user in a network. The method includes receiving a plurality of interference indicators by a user which is associated with a sector. The plurality of interference indicators corresponds to a plurality of sectors respectively each associated with one of a plurality of users and a base station. The method further includes processing at least information associated with the plurality of interference indicators and selecting an interference indicator based on at least information associated with the plurality of interference indicators. The selected interference indictor corresponds to one of the plurality of sectors. Additionally, the method includes determining a gain indicator corresponding to both the user and the one of the plurality of sectors, and processing information associated with the gain indicator. Moreover, the method includes determining a transmission power of the user based on at least information associated with the gain indicator and the selected interference indictor.

Description

Up-link transmit power optimal allocation method and system in the communication network

Technical field

The relate generally to communication technology of the present invention.More specifically, the present invention relates to a kind of method, be used for a scheme being provided so that the inter-sector interference of the transmitted power of leading subscriber and uplink wireless communications (inter-sector interference) to the network user.More specifically; Embodiments of the invention allow to insert (OrthogonalFrequency Division Multiple Access at justice management OFDM; OFDMA) under the situation of the inter-sector interference in the network, each user's up-link transmit power is carried out optimal allocation.But, should be realized that the present invention has the more applicability of wide region.

Background technology

Next generation wireless network will use OFDMA (OFDM access) technology, and this technology is used for up link network service and (access terminal, AT) the attached user of accessing terminal.In OFDMA, the uplink resource of distributing to the user is called burst (tile), and each burst is made up of continuous sub-carrier subset.Owing at the most a user is distributed to each in these bursts, therefore, the up link the sector in send be quadrature or not interference.But owing to possibly also other user in the nearby sectors distributed to same burst, therefore, inter-sector interference still influences user AT and sends.If those users in nearby sectors send with high power, then inter-sector interference can be serious the signal realized of limited subscriber and interference and noise ratio (signal to interferenceand noise ratio, SINR).Therefore, necessary careful leading subscriber transmitted power is to avoid excessive inter-sector interference.

For example, Fig. 1 shows and is used to a plurality of users and carries out transmitted power and regulate in the up link of OFDMA network, to realize the conventional method of higher rate.As shown in the figure, consider a user among these users, and this user is corresponding to the sector:

In order to realize higher speed, increase user's transmitted power;

The interference that is caused by the user on the nearby sectors increases;

User in the nearby sectors increases their power, with the interference of resisting increase and keep their original speed;

User power increase in the nearby sectors causes the interference in the sector to increase;

The user must increase power, to resist the interference of increase;

This chain of events repeats, till the user reaches its maximum transmit power.

The result that this method causes is, all users send with maximum power, and this is not that the best of uplink resource is used.On the contrary, through control user's up-link transmit power, will keep within the acceptable range in the interference of each sector, then maintenance system is stable better.In other words, in the up link of OFMDA network, user AT transmitted power must be selected enough greatly, so that desirable speed to be provided to the user, still, causes that interference, the too high meeting of power worsen the transmission near the sector significantly owing to send institute.

In general, interference level is maintained can not produce the best or fair solution in the limit of setting simply.For example, consider the simple scenario of two users, two sectors.Even have only a user sending, because limit has been formulated in its interference that on second sector, causes, this user's speed is restricted.Obviously, this is not best.In addition, suppose to have increased the 3rd sector, and the user in this sector hopes to send.So, the user in first sector sends with enough big power, causes reaching the jamming margin to second sector.So the 3rd user can not send, because do the interference constraints that reaches second user causing like this.This has just explained that system maybe be unfair.On the contrary, if the user in the 3rd sector just began to send before the user of first sector, then similarly, the user in first sector can not send.Therefore, this scheme is not unique, and this solution possibly cause instability potentially.

(Third Generation Partnership Project2 in framework 3GP2), is broadcasted inter-sector interference information by the sector, and AT can use inter-sector interference information to regulate power in third generation partner program 2.For various reasons, often be inappropriate based on some conventional arts this framework, that be used to handle the problems referred to above.For example, some central entities need be collected with the AT transmission and disturbed all relevant information, calculates solution then, and notifies each sector with solution.Perhaps, each sector must be made up these information, confirms best solution then.These traditional solutions need exchange bulk information, and the delay in the process of these information of collection possibly mean that when using the solution of calculating, the solution of being calculated no longer is best.

Therefore, hope a kind of improvement technology, be used to provide the optimal allocation of up-link transmit power based on distributed algorithm.

Summary of the invention

The relate generally to communication technology of the present invention.More specifically, the present invention relates to a kind of method, be used for a scheme being provided so that the inter-sector interference of the transmitted power of leading subscriber and uplink wireless communications to the network user.More specifically, embodiments of the invention allow to insert under the situation of the inter-sector interference in (OFDMA) network at justice management OFDM, and each user's up-link transmit power is carried out optimal allocation.But, should be realized that the present invention has the more applicability of wide region.

In a particular embodiment, the invention provides the method that a kind of user who is used in the network confirms transmitted power.This method comprises, receives a plurality of interference designators by the user relevant with the sector.A plurality of interference designators are corresponding with a plurality of sectors respectively, and user and base station among each in a plurality of sectors and a plurality of users are relevant.This method also comprises, to handling with the relevant information of a plurality of interference designators at least.In addition, this method comprises, based at least with the relevant information of a plurality of interference designators, select to disturb designator.Selected interference designator is corresponding with a sector in a plurality of sectors.This method also comprises, confirm with user and a plurality of sector in the corresponding gain designator in a sector, and to handling with the relevant information of designator that gains.In addition, this method comprises, based at least with gain designator and the relevant information of selected interference designator, confirm user's transmitted power.

In another particular embodiment, the invention provides the method that a kind of user who is used in the network confirms transmitted power.This method comprises, is received more than first interference designators of the first control time section by the user relevant with the sector.Disturb more than first designator corresponding with more than first sector respectively, the user and first base station among each sector in more than first sector and more than first user are relevant.In addition, this method comprises, to disturbing the relevant information of designators to handle with more than first at least, and based on disturbing first of relevant first control time of the Information Selection sections of designators to disturb designators with more than first at least.Selected first disturbs designator corresponding with a sector in more than first sector.This method also comprises, confirm with user and more than first sector in a sector first designator that gains corresponding, the first control time section, and to handling with the first relevant information of designator that gains.In addition, this method comprises, based on disturbing the relevant information of designator with the first gain designator and selected first at least, confirms first up-link transmit power of the second control time section.The second control time section is the time period that follows the first control time section closely.

In another specific embodiment of the invention, this method also comprises, is received more than second interference designators of the second control time section by the user.Disturb more than second designator corresponding with more than second sector respectively, the user and second base station among each in more than second sector and more than second user are relevant.In addition, this method comprises, to disturbing the relevant information of designators to handle with more than second at least, and based on disturbing the relevant information of designators with more than second at least, selects second of the second control time section to disturb designator.Selected second disturb one in designator and more than second sector corresponding.This method also comprises, confirm with user and more than second sector in a sector second designator that gains corresponding, the second control time section.In addition, this method comprises, to handling with the relevant information of the second gain designator, and based on disturbing the relevant information of designator with the second gain designator and selected second at least, confirms second up-link transmit power of the 3rd control time section.The 3rd control time section is another time period that follows the second control time section closely.

In another particular embodiment, the invention provides the system that a kind of user who is used in the network confirms transmitted power.This system comprises one or more parts, and these one or more parts are configured to, and receives a plurality of interference designators by the user relevant with the sector.A plurality of interference designators are corresponding with a plurality of sectors respectively, and user and base station among each sector in a plurality of sectors and a plurality of users are relevant.These one or more parts also are configured to, to handling with the relevant information of a plurality of interference designators at least, and based at least with the relevant information of a plurality of interference designators, select to disturb designator.Selected interference designator is corresponding with a sector in a plurality of sectors.In addition; This system is configured to; Confirm with user and a plurality of sector in the corresponding gain designator in a sector; To handling with gain designator relevant information, and based at least with gain designator and the relevant information of selected interference designator, confirm up-link transmit power through iteration.

Utilize the present invention to realize surpassing many advantages of prior art.Particularly, use distributed algorithm according to embodiments of the invention, wherein each sector is relevant user's rated output Decision of Allocation based on local sector auxiliary information independently.Embodiments of the invention move near the jamming margin of interference-limited sector through making network system, have realized high-performance.Other embodiments of the invention have also realized, for each user fairness among intrasystem a plurality of users distributes power.In addition, embodiments of the invention provide and have been used to manage the stable algorithm that up-link transmit power distributes.For example, in case realize stable state, then each AT continues work under steady state power is distributed, and in system, occurs till some variation.Because some variations will appear in the change of the radio condition aspect of each AT.According to embodiment, can realize one or more in these advantages.Below more specifically these and other advantage is described through the application.

With reference to following detailed description and accompanying drawing, can understand various other purpose of the present invention, characteristic and advantage more fully.

Description of drawings

Fig. 1 is the simplified flow chart that shows the conventional method of the user's transmitted power that is used for regulating communication network;

Fig. 2 is the simplified flow chart that illustrates according to the method for the up-link transmit power optimal allocation that is used for communication network of embodiments of the invention;

Fig. 3 is the rough schematic view that shows according to a plurality of emulation locations drawing that access terminal in the sub-district of specific embodiment of the present invention;

Fig. 4 is the reduced graph that shows based on the simulation result of the method that is provided by the embodiment of the invention.

Embodiment

The relate generally to communication technology of the present invention.More specifically, the present invention relates to a kind of method, be used for a scheme being provided so that the inter-sector interference of the transmitted power of leading subscriber and uplink wireless communications (inter-sector interference) to the network user.More specifically, embodiments of the invention allow to insert under the situation of the inter-sector interference in (OFDMA) network at justice management OFDM, and each user's up-link transmit power is carried out optimal allocation.But, should be realized that the present invention has the more applicability of wide region.

The up link framework of OFDMA network is made up of the burst collection.Each burst is made up of sub-carrier set.In some cases, these subcarriers can spread all over whole bandwidth, to give corresponding transmission frequency diversity are provided.In other cases, burst is made up of continuous sub-carrier subset, and interference and channel condition suffered in the wave band of subcarrier are used to make resource management decision.The burst structure that the back is one type provides a kind of and has been more suitable in the layout of data transmission.Each burst in the frame must be assigned to the user at the most in the corresponding sector.For situation about concentrating, must carry out resources optimization to each frame in all users in the network and each sector.This optimization can be that unusual signal is intensive.

According to one embodiment of the present of invention,, at first only utilize the peculiar information in sector to confirm the optimum user for each burst.Like this, can in each sector, carry out each burst independently distributes.Dispatching algorithm (scheduling algorithm) can be used for, and (quality of service, the out of Memory that QoS) guarantees and so on makes a policy based on the reverse, link channel quality of each AT and such as queue size and service quality.In case the user is assigned to burst, so, next procedure is exactly to confirm that the user sends the transmitted power that use.This power depends on that the packet that is sent out is with the expected interference that receives.This interference depends on that which user is dispensed near the sector and the power of each use among them.

Embodiments of the invention provide a kind of method, are used in each sector and each control time section is confirmed the transmitted power the user of particular sector.Fig. 2 is the simplified flow chart that is used for the communication network up-link transmit power is carried out optimal allocation that shows according to embodiments of the invention.This figure only is an example, can not constitute restriction to the scope of claim at this.Those skilled in the art will recognize that other modification, remodeling and replacement.As shown in the figure, the method 200 that is used for the distributing user up-link transmit power can be summarized as follows:

1. step 210: a plurality of network users are provided, and each user and base station form sector, each sector j and interference metric κ _jRelevant;

2. step 220: select a user i among a plurality of network users;

3. step 230: by user i receive current slot n, with interference metric κ from each sector j _j(n) relevant information;

4. step 240: identification and current slot n, with least interference tolerance κ _Jc(n) the sector jc of correspondence;

5. step 250: at least based on κ _Jc(n) relevant information, in the sector uplink channel gain g of the user i of jc _IjcAnd the predetermined convergence factor-alpha, according to the power P of current slot n _i(n), upgrade the transmitted power P of the next time period n+1 of user i _i(n+1).

6. repeating step 230 and continuation.

This series of steps provides a kind of approach according to the method for the embodiment of the invention that is used to carry out.As shown in the figure, can basis with user i independently distributed algorithm realize this method, this algorithm for burst in a plurality of network users are parallel runnings.Some step can be carried out according to different order.Can add or cancel some step.Certainly, also can make amendment, retrofit and replace.

In one embodiment of the invention, consider to be used for the power division of specific burst.Shown in the step 210 of method 200, suppose in burst, to provide N sector and each sector subscriber-related with one at least.Here, N can be any greater than 1 integer.Particularly, in each sector, select unique user i on burst, to send series of frames, wherein, i is any number in 1 to N.Owing between user and the sector man-to-man corresponding relation is arranged, therefore,, identical index is used for the network identity of the two according to embodiments of the invention.In one embodiment, use g _IjExpression is from the average channel gain of user i j to the sector.Therefore, if user i uses power p _iSend, the signal strength signal intensity that then i receives in the sector is p _ig _Ii, and in the sector j (it is p that j ≠ i) goes up the interference that produces _ig _IjIn one embodiment, channel gain g changes in time.In another embodiment, in the time period of being concerned about, channel gain g is static.In another embodiment, the user upgrades channel gain based on the estimation to the link pilot forward (forwardlink pilot) of a sector in a plurality of sectors.So, the j inter-sector interference that receives in sector is defined as

$I_j=\underset{i=1,i\≠j}{\overset{N}{\mathrm{\Σ}}}{p}_i{g}_{\mathrm{ij}}$

The background noise that j receives in the sector is represented with Nj, therefore, disturbs and adds that noise adds up to I _j+ N _j

For certain target, for example, make total system up-link flow maximization, then can be formulated corresponding optimization problem, and can confirm best solution.But,, confirm that therefore best solution needs global information, and therefore, need the method for centralization because the height between the decision variable interdepends.According to an embodiment, excessive interference causes user rate to reduce, and therefore, in such scope, wherein, the interference that each base station receives is limited in the predetermined jamming margin best solution usually.In addition, this is applicable to the situation of in each sector, arranging the user.If in particular sector, do not arrange burst, be incoherent then at the interference volume that in this sector, receives on this burst, and needn't be restricted.But, generally speaking,, therefore forced the jamming margin that runs through system so will on burst, arrange the user owing to be in all sectors of heavy duty.Therefore, according to the preferred embodiment,, then can use distributed algorithm in information to each local sector if identify interference-limited sector.Replacement, modification and remodeling that other can be arranged certainly.

In certain embodiments; Its interference level of each base station broadcast (being commonly referred to other sector interference (Other Sector Interference) or OSI level); Correspondingly, near the user it in sector regulates the transmitted power size, interference is maintained or be lower than certain limit.Generally speaking, this will prevent that locking system moves in the situation of not hoping (high interference levels).In other embodiments, the speed of the realization of the user in the sector increases with the reception SINR of the packet that sends.This signal depends on transmitted power and the uplink channel conditions that the user uses.In a particular embodiment, through limit I _MaxCome for all sector j set all inter-sector interference and thermal noise, promptly

I _j+N _j≤I _max

According to this predetermined jamming margin, the interference metric of each sector can be defined as:

${\mathrm{\κ}}_j\left(n\right)\≡\frac{I_{\max }-N_j\left(n\right)}{I_j\left(n\right)}$

When control time section n finishes, by this interference metric of sector j broadcasting.

In another embodiment of the present invention, can represent each user's maximum transmit power, and be illustrated in 0＜γ (n)＜1 and to be used to the power proportions (fraction) of dividing into groups to send during the time period n with P.Here, n is the Numerical Index of the duration of representative control/adjusting user transmitted power.Therefore, the transmitted power of in time period n, using provides through P γ (n), and problem is to confirm the value of γ (n) for each time period, makes all to satisfy interference constraints in each base station.

In a particular embodiment, method 200 provides the method that is used for confirming for the follow-up time section based on the known allocation of present time period n distribution.In step 230, user i receives the interference metric of the current slot n of each sector broadcasting.For particular sector j, the inter-sector interference that this sector receives does, with from all users' of the sector beyond the j of sector relevant all relative powers of channel gain and:

$I_j\left(n\right)=\underset{i=1,i\≠j}{\overset{N}{\mathrm{\Σ}}}p{\mathrm{\γ}}_i\left(n\right)g_{\mathrm{ij}}$

In the system of resource-constrained, fair allocat is exactly the impartial resource allocation that all users to limited resources provide.In an embodiment of the present invention, relevant resource is an inter-sector interference.When this resource reaches its maximum I _MaxThe time, in the sector this resource is limited.When this situation occurring, distribute identical interference to share for all users that use this resource.In another embodiment, owing to not having the user can increase their transmitted power and not causing surpassing interference constraints, so all users in the system are limited by this sector j.

In a particular embodiment, user i can with these sectors in one relevant, that is, the user receives jamming report broadcasting from this sector.All other sectors are enough far away, make their interference to ignore.

In one embodiment, because total total N user in the system, each user can cause on the resource-constrained sector and is at most (I so _Max-N _jThe interference of)/N.But, also exist limit (to use p to user's maximum transmit power _MaxExpression).These users that become power limited system can not contribute their interference to share, and therefore, " excessively " disturbs and can be used for using its user.Therefore, distribute identical interference to share should for unrestricted all users of power, and, the surplus in total interference of the user of their power limited system that always is shared as.

Embodiments of the invention provide a kind of method, are used to each sector and each control time section, confirm the transmitted power P γ of the unrestricted user i of power _i(n).In the step 240 that is used for current period n, through all interference metric κ that receive at user i _j(n) confirm the least interference metric in, identify crucial sector j, therefore, i ≠ j, κ _j(n)≤κ _i(n).In one embodiment, with the formula (1) of following form, upgrade the up-link transmit power ratio γ of user i through iteration _i

${\mathrm{\γ}}_i(n+1)={\mathrm{\γ}}_i\left(n\right)\frac{i_{\max }-N_j\left(n\right)}{I_j\left(n\right)}(1-\mathrm{\αP}{\mathrm{\γ}}_i\left(n\right)g_{\mathrm{ij}})---\left(1\right)$

Here, with the power proportions γ of current slot n _i(n) multiply by crucial sector j interference metric and with the channel gain g of the user i of crucial sector j _IjAnother relevant with factor-alpha measured, and obtains the power proportions γ of next time period n+1 _i(n+1).

In one embodiment, factor-alpha=0, formula (1) becomes so

${\mathrm{\γ}}_i(n+1)={\mathrm{\γ}}_i\left(n\right)k_j\left(n\right)={\mathrm{\γ}}_i\left(n\right)\frac{I_{\max }-N_j\left(n\right)}{I_j\left(n\right)}$

Therefore, in time period n+1, the interference that sector j receives does

$I_j(n+1)=\underset{i=1,i\≠j}{\overset{N}{\mathrm{\Σ}}}P{\mathrm{\γ}}_i(n+1)g_{\mathrm{ij}}$

$=\underset{i=1,i\≠j}{\overset{N}{\mathrm{\Σ}}}P{\mathrm{\γ}}_i\left(n\right)g_{\mathrm{ij}}\frac{I_{\max }-N_j\left(n\right)}{I_j\left(n\right)}$

$=I_{\max }-N_j\left(n\right)$

Therefore, for sector j, disturb to add thermal noise and become and equal maximum.

Consider other sector k ≠ j arbitrarily.The interference that this sector is caused is:

$I_k(n+1)=\underset{i=1,i\≠k}{\overset{N}{\mathrm{\Σ}}}P{\mathrm{\γ}}_i\left(n\right)g_{\mathrm{ik}}\frac{I_{\max }-N_j\left(n\right)}{I_j\left(n\right)}$

$=I_k\left(n\right)\frac{I_{\max }-N_j\left(n\right)}{I_j\left(n\right)}$

$=\frac{I_{\max }-N_k\left(n\right)}{{\mathrm{\κ}}_k\left(n\right)}{\mathrm{\κ}}_j\left(n\right)$

$=I_{\max }-N_k\left(n\right)$

Therefore, the interference of all other sectors and noise amount to and remain I at the most _Max, therefore, at least one in all sectors satisfies under the situation of equality, and their interference constraints is continued to satisfy in all sectors.In one embodiment, like what expect, the transmitted power of next time period of user i is higher.In another embodiment, even κ _j(n)＜1, still keep this inference.When interference adds that thermal noise surpasses the jamming margin of regulation, with this thing happens.In this case, the γ of next time period _i(n+1) will be set to and compare γ _i(n) low value.In other words, sector j becomes interference-limited sector, and, for each user, through limit I _Max, upgrade power with the interference constraints that all satisfy each sector.For example, for N sector, user i receives all interference metric κ of current slot _j, j=1,2 ..., N.In the middle of all above sector j, crucial sector is identified as has minimum κ _JcThe jc of value, this value corresponding to comprise from user i, owing to channel gain g _IjcDisturb between the maximum sector of the contribution that causes.

In another embodiment, the nonzero value factor-alpha in the formula (1) provides the additive regulating to the power of distributing to the user.Shown in formula, additive regulating acts on the for example interference on the jc of sector of interference-limited sector j based on present user i.In another embodiment, the effect of additive regulating provides the effect that makes power division fair, can consider through the steady state point that iteration reaches this effect to be described.For example; When system stability arrives certain stable state, represent the limits value of interference-limited sector jc, usefulness

expression γ (n) with

.Therefore in stable state, have

${\widetilde{\mathrm{\γ}}}_i={\widetilde{\mathrm{\γ}}}_i\frac{I_{\max }-N_{\tilde{j}}}{I_{\tilde{j}}}(1-\mathrm{\αP}{\widetilde{\mathrm{\γ}}}_i{g}_{\widetilde{\mathrm{ij}}})$

In one embodiment, for the user of power limited system, they are merely P at the transmitted power in stable state.In another embodiment; For the unrestricted user of those power, the inter-sector interference that their transmitted power will be updated to to gain based on the respective channels on each sector in these sectors can be expressed as

$P{\widetilde{\mathrm{\γ}}}_i{g}_{\widetilde{\mathrm{ij}}}=\frac{1}{\mathrm{\α}}(1-\frac{I_{\tilde{j}}}{I_{\max }-N_{\tilde{j}}})$

This means that in this restriction, the interference that user i produces is to be identical with the restriction that causes for all users on interference-limited sector.Therefore, in stable state, power division is fair, that is, unrestricted all users of power produce identical interference to affined sector.

In another embodiment, if α＞0, then I _j＜I _Max-N _j, because according to formula (1), the power strictness of distributing to each user is less than interference being added noise maintains I _MaxNeeded amount, therefore, I _j+ N _jAlso will be less than I _MaxIn another embodiment, along with α increases, I _jReduce, so system's power system capacity operation further away from each other, power system capacity is defined as the point that the interference-limited constraint is retraining.Therefore, have how near and corresponding definite system resource how to be used effectively apart from limit during through the work of definite interference-limited sector, factor-alpha also provides astriction.

Some embodiment of the present invention confirms according to factor-alpha how system can converge to the stable state that realizes justice rapidly.In one embodiment, for the balance that between performance and fairness, realizes hoping, must select factor-alpha.For example, when α increases, working point I _j+ N _jDescend.Therefore, according to embodiments of the invention, based on the power update scheme shown in the formula (1), the new user (it begins with enough power, to reach certain initial minimum-rate) who gets into can more promptly rise to its steady-state value.Certainly, the user's transmission rate in stable state will depend on that the user leaves interference-limited sector and how closely has.If the user is near this sector, then it will be very high to the channel gain of sector, and therefore, because the interference share that it causes, this user will be limited to enough little power.Therefore, its speed that can reach will be restricted.On the other hand, if the user away from interference-limited sector, the channel gain that then arrives this sector will be very little.So, the user will be allowed to use bigger power, and therefore, its speed is limited by its maximum transmit power.

Utilize the present invention, can realize surpassing many advantages of prior art.For example, based on the certain embodiments of the invention of distributed algorithm,, high-performance and justice are provided through near the jamming margin of interference-limited sector, moving.In addition, some embodiment of the present invention guarantees that algorithm also is stable.In case reach stable state, each user who connects through AT continues to distribute operation in steady state power, in system, occurs till certain change.Certainly, modification, replacement and remodeling can be arranged.For example, because the variation of the radio condition aspect of each AT can be made amendment.

Some embodiment of the present invention provides a kind of system, and the user who is used in the network confirms transmitted power.This system comprises one or more parts, and these parts are configured to, and receives a plurality of interference designators through the user relevant with the sector.A plurality of interference designators are corresponding with a plurality of sectors respectively, and among each sector and a plurality of users one in and the base station relevant.One or more parts also are configured to, to handling with the relevant information of a plurality of interference designators at least, and based at least with the relevant information of a plurality of interference designators, from a plurality of interference designators, select to disturb designator.The interference designator of selecting is corresponding with a sector in a plurality of sectors.In addition; This system is configured to; Confirm with user and a plurality of sector in the corresponding gain designator in a sector; To handling with gain designator relevant information, and based at least with the relevant information of interference designator of gain designator and selection, confirm up-link transmit power through iteration.

Prove based on high-performance, fairness and the stability of the user uplink link transmit power assignment of this system through carrying out some emulation, some embodiment of the present invention can be described.For example, a simple simulation model is provided.Fig. 3 is a rough schematic view, shows a plurality of emulation locations drawing that access terminal in the sub-district according to specific embodiment of the present invention.This figure only is an example, and here, it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that other modification, remodeling and replacement.Be illustrated as the network with nine square sub-districts, each sub-district is a sector.Unique user falls into each of these sub-districts at random, and each user represents with a circle.These sub-districts from left downside to the upper right side index.For 20 milliseconds control time sections (that is,, being 20 frames) for 1 millisecond frame duration, the interference level of each sub-district is measured, and when each section finishes in control time to the interference level of all other these sub-districts of cell report.When each control time section finishes, obtain to be used for the power division of control time section subsequently, then this power division is used for whole follow-up time section.In an example, during beginning, mourn in silence in all sub-districts.At time t=2xs, the user who has in the sub-district of index x begins to send.When initial, distribute enough big power for this user, to reach the minimum-rate of regulation.

In one embodiment, can confirm to be called as the accessible maximum rate of the revert all link of uplink capacity according to the simulation model of simplifying.Fig. 4 is the reduced graph that shows the simulation result of the method acquisition that provides according to embodiments of the invention.This figure only is an example, and it should not limit the scope of claim undeservedly.Those skilled in the art will recognize that other modification, remodeling and replacement.Be illustrated as according to the situation that the front is described and carry out five figure that emulation obtains.First Figure 41 0 illustrates according to normalized, the time dependent institute of uplink capacity and reaches total speed.In an example, in case all users all sending, then system 5% with interior near and reach capacity.In another example, can be used for the leeway of rate adaptation when underload because have more, so system's convergence being faster more.In another example,, still in 3 seconds, realize convergence even when full load (in t=18 second).

With reference to Fig. 4, second Figure 42 0 provides according to the relation between normalized each user rate of jamming margin and the user's interference contribution.For example, jamming margin is I _MaxFigure 42 0 illustrates along with more users add, the user's in system speed reduces.Figure 42 0 also shows the correlation (also visible Fig. 3) between speed and the customer location.

The 3rd Figure 43 0 of Fig. 4 shows interference and the user power to the contribution of interference-limited sector according to normalized each user of maximum.For example, user's maximum power value is P.The unrestricted user of power converges on common value, and the user of power limited system converges on the value below the common value.Certainly, other modification, replacement and remodeling can be arranged.

The 4th Figure 44 0 of Fig. 4 illustrates as, each user's the transmitted power normalized according to jamming margin and the relation of sector interference.For example, Figure 44 0 shows the user of power limited system and does not reach the user that it disturb to be shared in interference-limited sector.Certainly, other modification, replacement and remodeling can be arranged.

The 5th Figure 45 0 of Fig. 4 illustrates the interference and the time relation of each sector.As shown in the figure, in 25 seconds time range, interference-limited sector converges on the only interference value below maximum (this interference comprises thermal noise), and is desired like the factor-alpha to the nonzero value that in emulation, uses.Certainly, other modification, replacement and remodeling can be arranged.For example, under another kind of simulation scenarios, changed the order that is used for the user is added to system.According to the method that is provided by the embodiment of the invention, as desired, all users converge on identical speed.

Below only be the abundant description that specific embodiment is carried out, can also use various remodeling, replacement structure and being equal to.Although utilized the sequence of steps of selection that above method is described, also can use any combination of any key element of described step and other step.In addition, according to embodiment, some step can be combined and/or cancel.Be also to be understood that example described herein and embodiment only for purposes of illustration, and, according to the application to the various remodeling of those skilled in the art suggestion or revise within the scope of the spirit that also will be included in the application and purport and accompanying claims.

Claims (38)

1. a user who is used in the network confirms the method for transmitted power, and said method comprises:

Receive a plurality of interference designators by the user, said user is relevant with the sector, and said a plurality of interference designators are corresponding with a plurality of sectors respectively, and user and base station among each in said a plurality of sectors and a plurality of users are relevant; Represent said user with scope at 1 to N index i, N is the integer greater than 1; In said a plurality of interference designator each respectively with interference metric κ _jCorrespondence, said interference metric κ _jRelevant with a sector j, j is the index of any sector in the said a plurality of sectors of representative; Said interference metric κ _jBroadcast as a ratio by sector j, the inter-sector interference I that said ratio receives for sector j from other sector _jWith the predetermined interference constraints I that equals sector j _MaxDeduct the background noise N of the j in the sector _jAfter the ratio of amount;

To handling with the relevant information of said a plurality of interference designators at least;

Based at least with the relevant information of said a plurality of interference designators, from said a plurality of interference designators, select to disturb designator, selected interference designator is corresponding with a sector in said a plurality of sectors;

Confirm with said user and said a plurality of sector in the corresponding gain designator in a sector;

To handling with the relevant information of said gain designator;

Based at least with said gain designator and the relevant information of selected interference designator, confirm said user's transmitted power.

2. the method for claim 1, wherein said user comprises the travelling carriage that is connected with communication network.

3. the method for claim 1, wherein said user comprises that OFDM inserts accessing terminal in the sector of (OFDMA) network.

4. the method for claim 1, wherein said inter-sector interference I _jComprise by with a plurality of sectors in the combination interference that produces of the relevant all-network user in each sector except that the j of sector.

5. the method for claim 1, wherein from said a plurality of interference designators, select to disturb designator to comprise, confirm the specified control time period, with interference metric κ _JcA corresponding sector jc of minimum value.

6. method as claimed in claim 5 wherein, confirms that said gain designator comprises, confirms the channel gain g from user i to the sector jc that confirms _Ijc

7. the method for claim 1, wherein for control time section m, the transmitted power of user i is expressed as P _i(m), P _i(m) equal maximum power value P and multiply by the decay factor γ corresponding with user i at control time section m _i(m).

8. method as claimed in claim 7, wherein, m is to use the index of continuous integral number, in a series of time periods of the up-link transmit power in each integer representative of consumer regulating networks one.

9. method as claimed in claim 8, wherein, the transmitted power of confirming user i at least with decay factor γ based on current control time section m _i(m), confirm the decay factor γ of next control time section m+1 through iteration _i(m+1) relevant.

10. method as claimed in claim 9, wherein, the transmitted power of confirming user i also with use channel gain g _IjcIt is relevant to multiply by convergence factor, and said convergence factor is the predetermined constant α between 0 and 1.

11. method as claimed in claim 10 wherein, is represented as follows from the transmitted power that control time section m upgrades user i to next control time section m+1 iteration:

Pγ _i(m+1)＝Pγ _i(m)κ _jc(m)[1-αPγ _i(m)g _ijc]

Wherein, said κ _Jc(m) be the least interference metric of said control period m.

12. a user who is used in the network confirms the method for transmitted power, said method comprises:

Receive more than first interference designators of the first control time section by the user; Said user is relevant with the sector; Said more than first disturb designators corresponding with more than first sector respectively, and the user and first base station among each in said more than first sector and more than first user are relevant; Represent said user with scope at 1 to N index i, N is the integer greater than 1; In said a plurality of interference designator each respectively with interference metric κ _jCorrespondence, said interference metric κ _jRelevant with a sector j, j is the index of any sector in the said a plurality of sectors of representative; Said interference metric κ _J1Be defined as a ratio, said ratio is the inter-sector interference I that sector j1 receives in very first time section _J1With the predetermined interference constraints I that equals sector j1 _Max1Deduct the background noise N of sector j1 in very first time section _jThe ratio of amount;

To disturbing the relevant information of designator to handle with said more than first at least;

Based on disturbing the relevant information of designator with said more than first at least, from said more than first interference designators, select first of the first control time section to disturb designator, selected first disturbs designator corresponding with a sector in said more than first sector;

Confirm with said user and said more than first sector in a sector first designator that gains corresponding, the first control time section;

To handling with the relevant information of the said first gain designator;

Based on disturbing the relevant information of designator with the said first gain designator and selected first at least, confirm first up-link transmit power of the second control time section.

13. method as claimed in claim 12, wherein, said more than first disturb in the designators each respectively with when the first control time section finishes by the interference metric κ of a sector j1 broadcasting _J1Relevant, j1 is the index of a sector in said more than first sector of representative.

14. method as claimed in claim 12 wherein, selects first of the first control time section to disturb designator to comprise from said more than first interference designators, in the first control time section, confirms sector j _1c, said sector j _1cCorresponding to the interference metric κ that is equal to or less than any sector j1 in said more than first sector _J1The least interference tolerance κ of value _J1cValue.

15. method as claimed in claim 12, wherein, first up-link transmit power of the second control time section is represented as P _i(2), i is the index of representative of consumer, at the second control time section, P _i(2) equal maximum power value P and multiply by the decay factor γ corresponding with user i _i(2).

16. method as claimed in claim 15 also comprises:

Receive more than second of the second control time section by the user and disturb designators, said more than second are disturbed designators corresponding with more than second sector respectively, and the user and second base station among each in said more than second sector and more than second user are relevant;

To disturbing the relevant information of designator to handle with said more than second at least;

Based on disturbing the relevant information of designator with said more than second at least, from said more than second interference designators, select second of the second control time section to disturb designator, selected second disturbs designator corresponding with a sector in said more than second sector;

Confirm with said user and said more than second sector in a sector second designator that gains corresponding, the second control time section;

To handling with the relevant information of the said second gain designator;

Based on disturbing the relevant information of designator with the said second gain designator and selected second at least, confirm second up-link transmit power of the 3rd control time section.

17. method as claimed in claim 16, wherein, said second base station is identical with said first base station.

18. method as claimed in claim 16, wherein, said second base station is different with said first base station.

19. method as claimed in claim 16, wherein, the said second control time section is the time period that follows the said first control time section closely, and said the 3rd control time section is the time period that follows the said second control time section closely.

20. method as claimed in claim 19, wherein, the said first control time section, the said second control time section and said the 3rd control time section are equal to the fixedly duration.

21. method as claimed in claim 19, wherein, the said first control time section, the said second control time section and said the 3rd control time section are respectively the different duration.

22. method as claimed in claim 16, wherein, said more than second disturb in the designators each respectively with when the said second control time section finishes by the interference metric κ of a sector j2 broadcasting _J2Relevant, j2 is one a index in said more than second sector of representative.

23. method as claimed in claim 22, wherein, said interference metric κ _J2Be defined as a ratio, the inter-sector interference I of said ratio in the second control time section, receiving by sector j2 _J2With equal sector j2 predetermined interference constraint I _Max2Deduct the background noise N of sector j2 in the second control time section _J2After the ratio of amount.

24. method as claimed in claim 23 wherein, selects second of the second control time section to disturb designator to comprise from said more than second interference designators, in the second control time section, confirms sector j _2c, said sector j _2cCorresponding to any κ that is equal to or less than any sector j2 in said more than second sector _J2Interference metric values κ _J2c

25. method as claimed in claim 24, wherein, sector j2c is different with sector j1c.

26. method as claimed in claim 24, wherein, sector j2c is identical with sector j1c.

27. method as claimed in claim 24, wherein, the said second gain designator is the channel gain g from user i j2c to the sector _Ij2c

28. method as claimed in claim 24 wherein, is confirmed the second up-link transmit power P of the 3rd control time section for user i _i(3) comprise, with value κ _J2cMultiply by the first up-link transmit power Pi (2) of the second control time section.

29. method as claimed in claim 28 wherein, is confirmed the second up-link transmit power P of the 3rd control time section for user i _i(3) also comprise, regulate said second up-link transmit power with addition Item, said addition Item comprises and said first up-link transmit power and the said second gain designator g _Ij2cThe convergence factor that multiplies each other, said convergence factor are the constant alpha between 0 and 1.

30. one kind is used to the system that user in the network confirms transmitted power, said system comprises:

Receiver module is configured to receive a plurality of interference designators by the user, and said user is relevant with the sector, and said a plurality of interference designators are corresponding with a plurality of sectors respectively, and user and base station among each in said a plurality of sectors and a plurality of users are relevant; Represent said user with scope at 1 to N index i, N is the integer greater than 1; In said a plurality of interference designator each respectively with interference metric κ _jCorrespondence, said interference metric κ _jRelevant with a sector j, j is the index of any sector in the said a plurality of sectors of representative; Said interference metric κ _jBroadcast as a ratio by sector j, the inter-sector interference I that said ratio receives for sector j from other sector _jWith the predetermined interference constraints I that equals sector j _MaxDeduct the background noise N of the j in the sector _jAfter the ratio of amount;

First processing module is configured to handling with the relevant information of said a plurality of interference designators at least;

Select module, be configured to based at least with the relevant information of said a plurality of interference designators, from said a plurality of interference designators, select to disturb designator, selected interference designator is corresponding with a sector in said a plurality of sectors;

Confirm the designator module, be configured to confirm with said user and said a plurality of sector in the corresponding gain designator in a sector;

Second processing module is configured to handling with the relevant information of said gain designator;

Confirm power model, be configured to based at least with said gain designator and the relevant information of selected interference designator, confirm up-link transmit power.

31. system as claimed in claim 30, wherein, said user comprises that OFDM inserts accessing terminal in (OFDMA) network.

32. system as claimed in claim 30, wherein, by said a plurality of sectors respectively to the said a plurality of interference designators of each users broadcasting.

33. system as claimed in claim 30, wherein, selected interference designator is corresponding with the sector with least interference metric.

34. system as claimed in claim 33 wherein, based on the estimation to the forward link pilot of a sector in a plurality of sectors, upgrades said gain designator by the user.

35. system as claimed in claim 34, wherein, based on the up-link transmit power that multiplies each other at the selected interference designator of current control time section, confirm up-link transmit power through iteration for the user in next control time section.

36. system as claimed in claim 35, wherein, said next control time section is the time period that follows current control time section closely.

37. system as claimed in claim 36; Wherein, Also utilize addition Item to regulating at the up-link transmit power of next control time section, said addition Item comprises the convergence factor that multiplies each other with said transmitted power and said channel gain in current control time section.

38. system as claimed in claim 37, wherein, said convergence factor is the predetermined constant between 0 and 1.

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