CN101925187B - Method and device for joint distribution of cell resources in OFDMA (Orthogonal Frequency Division Multiple Access) system - Google Patents
Method and device for joint distribution of cell resources in OFDMA (Orthogonal Frequency Division Multiple Access) system Download PDFInfo
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Abstract
The invention discloses a method and a device for joint distribution of cell resources in an OFDMA (Orthogonal Frequency Division Multiple Access) system. The method comprises the following steps: calculating the transmitting power of a user i in a cooperation region on a subcarrier j of a service cell; receiving a path gain from a neighbor cell site of the user i using the subcarrier j to the user i and the transmitting power of a user using the subcarrier j in a neighbor cell of the service cell of the user i, and updating the transmitting power of the user i on the subcarrier j of the service cell; calculating the signal-to-interference and noise ratio (SINR) of the user i on the subcarrier j of the service cell on the basis of the updated transmitting power; judging whether the SINR of the user i on the subcarrier j of the service cell satisfies a SINR threshold of the user i on the subcarrier j; if the SINR of the user i on the subcarrier j of the service cell does not satisfy the SINR threshold of the user i on the subcarrier j, increasing the transmitting power of the user i on the subcarrier j of the service cell in a preset step length, and continuing the procedure for calculating SINR by using the increased transmitting power as an updated transmitting power.
Description
Technical field
The present invention relates to the mobile communication technology field, more specifically, relate to combined distributing method and the device of a kind of orthogonal frequency division multiplexing multiple access (Orthogonal Frequency Division Multiple Access, OFDMA) system's small area resource.
Background technology
Wireless frequency spectrum belongs to scarce resource, and along with the lifting of user to transmission rate request, alone family will take increasing frequency spectrum resource, and therefore, in cell mobile communication systems, spectrum reuse becomes the key factor of elevator system performance.When neighbor cell uses overlapping frequency spectrum resource, will cause serious presence of intercell interference, presence of intercell interference is one of principal element that affects the future mobile communication system performance.The inhibition of presence of intercell interference can realize by a lot of modes:
(1) frequency spectrum is divided into the frequency range of non-overlapping copies, and so that neighbor cell adopts the method for the frequency range of non-overlapping copies to realize easily, but a part of frequency resource can only be used in each residential quarter, therefore is difficult to provide high transfer rate.
(2) subcarrier based on Interference Estimation weighs distribution technique, its emphasis is after system finishes allocation of carriers, presence of intercell interference to be measured, and the residential quarter of serious interference is re-started allocation of carriers, use mutually orthogonal frequency range, it is actually a kind of local optimization technique.
(3) only consider the allocation of carriers of inside, single residential quarter, do not consider presence of intercell interference, therefore generally need and (2) in the technology use that combines.
In general, the following defective of existing OFDMA system carrier distribution method ubiquity: 1) can not be from network integral body, or from the network pool allocation of carriers in larger zone; 2) power is another key factor that affects presence of intercell interference, fails allocation of carriers and power division are combined.
Summary of the invention
The technical problem that the present invention will solve provides the combined distributing method of a kind of OFDMA system small area resource, allocation of carriers and power division can be combined to reduce presence of intercell interference.
The invention provides the combined distributing method of a kind of OFDMA system small area resource, comprise that the Constraint-based condition calculates the transmitting power of user i on the subcarrier j of its Serving cell in the collaboration region, and with user i on the subcarrier j of its Serving cell transmitting power and the base station in service sector of the user i user's of use subcarrier j in the neighbor cell of the Serving cell of user i path gain send to neighbor cell; Receive to use the neighbor cell base station of the user i of subcarrier j to use the user's of subcarrier j transmitting power in the neighbor cell of the Serving cell of the path gain of user i and user i, and upgrade the transmitting power of user i on the subcarrier j of Serving cell according to the path gain that receives and transmitting power; Based on all use the user's of subcarrier j transmitting power to calculate the Signal to Interference plus Noise Ratio SINR of user i on the subcarrier j of Serving cell in the collaboration region of upgrading; Judge whether the SINR of user i on the subcarrier j of Serving cell satisfies the SINR thresholding of user i on subcarrier j, if do not satisfy the SINR thresholding of user i on subcarrier j, then increase the transmitting power of user i on the subcarrier j of Serving cell with predetermined step-length, and the transmitting power after will increasing continues to carry out the step of calculating the Signal to Interference plus Noise Ratio SINR of user i on the subcarrier j of Serving cell as the transmitting power of upgrading, otherwise iteration finishes.
An embodiment according to the inventive method, judging whether the SINR on the subcarrier j of user i at Serving cell satisfied user i before the SINR thresholding on the subcarrier j, and the method also comprises: whether the difference of the SINR of user i on the subcarrier j of Serving cell after judging adjacent twice iteration is less than improvement threshold; If less than improvement threshold, then in the Serving cell of user i, search whether there is idle subcarrier; If there is idle subcarrier, then replace subcarrier j in the Serving cell of user i with idle subcarrier, otherwise, close the subcarrier j in the Serving cell of user i with predetermined probability.
According to another embodiment of the inventive method, constraints comprises: in the situation of each user's transmission rate greater than corresponding minimum transmission rate, minimize the transmitting power sum of all subcarriers in the collaboration region in the collaboration region; Transmitting power sum in the collaboration region on all subcarriers of each residential quarter is less than the preset power thresholding.
According to the another embodiment of the inventive method, the step of the transmitting power on the subcarrier j of Serving cell comprises according to the path gain that receives and transmitting power renewal user i: determine to use in the collaboration region all users' of subcarrier j set; In the neighbor cell of the Serving cell of the path gain of user i and user i, use the user's of subcarrier j transmitting power to calculate the power of the required increase of user i according to the neighbor cell base station of the user i that uses subcarrier j in the collaboration region; Obtain transmitting power on the subcarrier j of New Consumers i at Serving cell more according to user i at the power of the transmitting power on the subcarrier j of Serving cell and the required increase of user i.
According to an again embodiment of the inventive method, each user assignment in each residential quarter of collaboration region has different subcarriers.
The combined distributing method of OFDMA of the present invention system small area resource, the angle of optimizing from multi-plot joint is considered the co-allocation of carrier wave and power, can further promote the utilization ratio of resource.Simultaneously, adopt the distributed mode of finding the solution, the distribution of carrier wave and power is finished independently by exchange message in the minizone, can realize parallel computation, thereby has reduced the complexity of calculating.
Another technical problem that the present invention will solve provides the co-allocation device of a kind of OFDMA system small area resource, allocation of carriers and power division can be combined to reduce presence of intercell interference.
The invention provides the co-allocation device of a kind of OFDMA system small area resource, comprise the power initialization module, be used for the Constraint-based condition and calculate the transmitting power of user i on the subcarrier j of Serving cell in the collaboration region, and with user i on the subcarrier j of its Serving cell transmitting power and the base station in service sector of the user i user's of use subcarrier j in the neighbor cell of the Serving cell of user i path gain send to neighbor cell; The power update module, link to each other with the power initialization module, be used for to receive use the neighbor cell base station of the user i of subcarrier j to use the user's of subcarrier j transmitting power to the neighbor cell of the Serving cell of the path gain of user i and user i, and upgrade the transmitting power of user i on the subcarrier j of Serving cell according to the path gain that receives and transmitting power; The SINR acquisition module links to each other with the power update module, is used for based on all use the user's of subcarrier j transmitting power to calculate the Signal to Interference plus Noise Ratio SINR of user i on the subcarrier j of Serving cell in the collaboration region of upgrading; The iteration judge module, link to each other with the SINR acquisition module, be used for judging whether the SINR of user i on the subcarrier j of Serving cell satisfies the SINR thresholding of user i on subcarrier j, if do not satisfy the SINR thresholding of user i on subcarrier j, then increase the transmitting power of user i on the subcarrier j of Serving cell with predetermined step-length, and the transmitting power after will increasing forwards the SINR acquisition module to as the transmitting power of upgrading, otherwise iteration finishes.
An embodiment of the apparatus according to the invention, this device also comprises: the improvement threshold judge module, link to each other with the SINR acquisition module, be used for judging that whether the difference of the SINR of user i on the subcarrier j of Serving cell after adjacent twice iteration is less than improvement threshold; Subcarrier is searched module, links to each other with the improvement threshold judge module, is used in the situation of difference less than improvement threshold of Signal to Interference plus Noise Ratio SINR, searches whether there is idle subcarrier in the Serving cell of user i; The subcarrier adjusting module, searching module with subcarrier links to each other, be used in the situation that has idle subcarrier, using idle subcarrier to replace the subcarrier j of the Serving cell of user i, and in the situation that does not have idle subcarrier, close the subcarrier j in the Serving cell of user i with predetermined probability.
According to another embodiment of apparatus of the present invention, constraints comprises: in the situation of each user's transmission rate greater than corresponding minimum transmission rate, minimize the transmitting power sum of all subcarriers in the collaboration region in the collaboration region; Transmitting power sum in the collaboration region on all subcarriers of each residential quarter is less than the preset power thresholding.
According to the another embodiment of apparatus of the present invention, the power update module comprises: the user gathers determining unit, is used for the set that all users of subcarrier j are used in definite collaboration region; The increment power calculation unit, gather determining unit with the user and link to each other, be used for using the neighbor cell base station of the user i of subcarrier j in the neighbor cell of the Serving cell of the path gain of user i and user i, to use the user's of subcarrier j transmitting power to calculate the power of the required increase of user i according to the collaboration region; Updating block links to each other with the increment power calculation unit, is used for obtaining transmitting power on the subcarrier j of New Consumers i at Serving cell more according to user i at the power of the transmitting power on the subcarrier j of Serving cell and the required increase of user i.
According to an again embodiment of apparatus of the present invention, each user assignment in each residential quarter of collaboration region has different subcarriers.
The co-allocation device of OFDMA of the present invention system small area resource, the angle of optimizing from multi-plot joint is considered the co-allocation of carrier wave and power, can further promote the utilization ratio of resource.Simultaneously, adopt the distributed mode of finding the solution, the distribution of carrier wave and power is finished independently by exchange message in the minizone, can realize parallel computation, thereby has reduced the complexity of calculating.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part.In the accompanying drawings:
Fig. 1 is the schematic flow sheet of first embodiment of the inventive method.
Fig. 2 is OFDMA system cell topology and user distribution schematic diagram.
Fig. 3 is the schematic flow sheet of second embodiment of the inventive method.
Fig. 4 is the structural representation of first embodiment of apparatus of the present invention.
Fig. 5 is the structural representation of second embodiment of apparatus of the present invention.
Fig. 6 is the structural representation of the 3rd embodiment of apparatus of the present invention.
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention wherein is described.Exemplary embodiment of the present invention and explanation thereof are used for explaining the present invention, but do not consist of improper restriction of the present invention.
The present invention under the prerequisite that guarantees user's transmission rate, take total transmitting power of minimizing all residential quarters in the collaboration region as target, carrier wave and power be assigned as decision variable.
The present invention namely, considers the interference to other residential quarters simultaneously by the distribution at inter-cell coordination carrier wave and power when distributing carrier wave and power, thereby realizes that interference coordination is to reduce the presence of intercell interference of system.In addition, the present invention proposes to unite the distribution of considering carrier wave and power, distributes the high Computational Complexity that may exist for multi-plot joint, has proposed distributed method for solving.
Fig. 1 is the schematic flow sheet of first embodiment of the inventive method.
As shown in Figure 1, this embodiment can may further comprise the steps:
S102, the Constraint-based condition is calculated the transmitting power of user i on the subcarrier j of its Serving cell in the collaboration region, and in the neighbor cell of the Serving cell of user i, use the user's of subcarrier j path gain to send to neighbor cell transmitting power and the base station in service sector of user i of user i on the subcarrier j of its Serving cell, so that use the user of subcarrier j to upgrade its transmitting power in the neighbor cell, wherein, the collaboration region is made of a plurality of residential quarters, as shown in Figure 2;
S104, receive to use the neighbor cell base station of the user i of subcarrier j to use the user's of subcarrier j transmitting power in the neighbor cell of the Serving cell of the path gain of user i and user i, and upgrade the transmitting power of user i on the subcarrier j of Serving cell according to the path gain that receives and transmitting power;
S106 is based on all use the user's of subcarrier j transmitting power to calculate the Signal to Interference plus Noise Ratio SINR of user i on the subcarrier j of its Serving cell in the collaboration region after upgrading;
S108 judges whether the SINR of user i on the subcarrier j of its Serving cell satisfies the SINR thresholding of user i on subcarrier j;
S110, if do not satisfy the SINR thresholding of user i on subcarrier j, then increase the transmitting power of user i on the subcarrier j of its Serving cell with predetermined step-length, and the transmitting power after will increasing continues to carry out S106 to carry out iteration as the transmitting power of upgrading, otherwise iteration finishes.
Wherein, constraints can comprise: in the situation of each user's transmission rate greater than corresponding minimum transmission rate, minimize the transmitting power sum of all subcarriers in the collaboration region in the collaboration region; Transmitting power sum in the collaboration region on all subcarriers of each residential quarter is less than the preset power thresholding.
The angle that this embodiment optimizes from multi-plot joint is considered the co-allocation of carrier wave and power, can further promote the utilization ratio of resource.Simultaneously, adopt the distributed mode of finding the solution, the distribution of carrier wave and power is finished independently by exchange message in the minizone, can realize parallel computation, thereby has reduced the complexity of calculating.
Fig. 3 is the schematic flow sheet of second embodiment of the inventive method.
As shown in Figure 3, this embodiment can may further comprise the steps:
S202, the Constraint-based condition is calculated the transmitting power of user i on the subcarrier j of its Serving cell in the collaboration region, in the neighbor cell of the Serving cell of user i, use the user's of subcarrier j path gain to send to neighbor cell transmitting power and the base station in service sector of user i of user i on the subcarrier j of its Serving cell, and the initial SINR of user i on subcarrier j is set;
S204, receive to use the neighbor cell base station of the user i of subcarrier j to use the user's of subcarrier j transmitting power in the neighbor cell of the Serving cell of the path gain of user i and user i, and upgrade the transmitting power of user i on the subcarrier j of its Serving cell according to the path gain that receives and transmitting power;
S206 is based on all use the user's of subcarrier j transmitting power to calculate the SINR of user i on the subcarrier j of its Serving cell in the collaboration region of upgrading;
Whether S208 judges the difference of the SINR of user i on the subcarrier j of its Serving cell after adjacent twice iteration less than improvement threshold, that is, whether the SINR after adjacent twice iteration improves less;
S210, if less than improvement threshold (that is, increase transmitting power and can not effectively improve SINR), then in the Serving cell of user i, search whether there is idle subcarrier, otherwise, forward S216 to;
S212 is if the idle subcarrier of existence then with the subcarrier j in the Serving cell of idle subcarrier replacement user i, with the interference between the user who prevents use subcarrier j in the neighbor cell, and forwards S216 to;
S214, if there is no idle subcarrier, and owing to improve user's transmitting power to improving the SINR of user i on subcarrier j without remarkable result again, then close subcarrier j in the Serving cell of user i with predetermined probability, to prevent using the user's of subcarrier j interference in the neighbor cell;
S216 judges whether the SINR of user i on the subcarrier j of its Serving cell satisfies the SINR thresholding of user i on subcarrier j;
S218, if do not satisfy the SINR thresholding of user i on subcarrier j, then increase the transmitting power of user i on the subcarrier j of Serving cell with predetermined step-length, and the transmitting power after will increasing continues to carry out S206 as the transmitting power of upgrading, otherwise iteration finishes.
The transmitting power that this embodiment has considered to increase subcarrier has not only reduced the interference of minizone, but also makes the resource allocation process of whole system faster iteratively the abnormality processing of SINR when significantly improving.
In the 3rd embodiment of the inventive method, the step of the transmitting power on the subcarrier j of its Serving cell comprises according to the path gain that receives and transmitting power renewal user i:
Determine to use in the collaboration region all users' of subcarrier j set;
In the neighbor cell of the Serving cell of the path gain of user i and user i, use the user's of subcarrier j transmitting power to calculate the transmitting power of the required increase of user i according to the neighbor cell base station of the user i that uses subcarrier j in the collaboration region;
According to the transmitting power on the subcarrier j of user i at its Serving cell of user i after the transmitting power of the transmitting power on the subcarrier j of its Serving cell and the required increase of user i obtains upgrading.
This embodiment has considered to use the user of same sub-carrier to this user's interference with this user in the neighbor cell when upgrading user emission power, thereby, in the situation that satisfies user's transmission rate, can effectively reduce the interference of inter-cell user.
In the above-described embodiments, each subcarrier in each residential quarter of collaboration region is distributed to respectively different user.
In the 4th embodiment of the inventive method, there is data communication interface between each base station in the collaboration region, each base station in the collaboration region can send to neighbor cell with user's relevant information (for example, path gain etc.) by data communication interface.In addition, the associated pathway gain that portable terminal can also be measured sends to the base station by air interface by portable terminal, for example, the employed portable terminal of user i can be measured the neighbor cell base station of the user i that uses subcarrier j to the path gain of user i, and will be gained by air interface by the employed portable terminal of user i feeds back to the base station in service sector of user i again by up channel.
There is feedback channel in up link, the channel gain of down channel can be fed back to the base station, so the channel status of each user in the overlay area can be known in the base station.
Each user assignment in each residential quarter in the collaboration region has different subcarriers, that is, in a residential quarter, same subcarrier can not be distributed to different user.
The optimization aim of this embodiment is the base station transmitting power that minimizes all residential quarters in the collaboration region, and this transmitting power is the transmitting power sum of all subcarriers of all base stations.
Wherein, constraints 1 is that the total transmitting power of single subdistrict on all carrier waves is less than the preset power thresholding.
There is minimum requirements in constraints 2 for the transmission rate of any user in the collaboration region, that is, the transmission rate that the user realizes after carrier wave and the power division must be greater than minimum transmission rate.The transmission rate that the user realizes is the throughput sum of the carrier wave that obtains of user assignment, and the throughput of carrier wave is apart from, carrier wave Signal to Interference plus Noise Ratio SINR substitution channel capacity formula (C=Wlog by intercarrier
2(1+SINR)) calculate.
Because above-mentioned channel capacity formula relates to NONLINEAR CALCULATION, so in order to reduce the complexity of calculating, this embodiment adopts following hypothesis to power division: the user realizes identical throughput at all carrier waves that distribute, and therefore the user can be converted into requirement (because user's transmission rate equals the throughput that user's sub-carrier number multiply by the every subcarrier of user) to number of sub carrier wave to the requirement of transmission rate.In the carrier wave that the user distributes, power division must arrive certain Signal to Interference plus Noise Ratio level, and the Signal to Interference plus Noise Ratio level is by the throughput decision of single carrier.Therefore, constraints 2 finally is converted into following two constraintss: the carrier number of (a) distributing to certain user must be not less than certain predefined threshold value; (b) Signal to Interference plus Noise Ratio of carrier wave must be not less than certain predefined threshold value arbitrarily.In this embodiment, it is known to suppose to distribute to user's carrier number.
Therefore, allocation algorithm can be realized by following steps:
Step 1, each residential quarter independent operation in the collaboration region, do not consider presence of intercell interference, the carrier wave of fill order residential quarter and power co-allocation strategy, the allocation result that obtains is as initial value, and allocation result (for example, user's transmitting power and active user's base station in service sector is used the user's of same sub-carrier path gain in the neighbor cell of active user's Serving cell) passed to neighbor cell;
Step 2, each residential quarter independent operation recomputates the transmitting power of each subcarrier according to the allocation result of the neighbor cell that receives, and calculates thus the Signal to Interference plus Noise Ratio on each subcarrier, to not satisfying the carrier wave of signal interference ratio requirement, increase transmitting power with a fixed step size;
Step 3, each residential quarter independent operation, recomputate each user's subcarrier Signal to Interference plus Noise Ratio, and obtain improvement degree after adjacent twice iteration of each user's subcarrier Signal to Interference plus Noise Ratio, find out and improve minimum subcarrier and corresponding user thereof, if the improvement degree less than improvement threshold, then replaces this subcarrier with idle subcarrier in this user's Serving cell, if do not have idle subcarrier, then turn off this subcarrier with certain probability;
Step 4 judges whether current subcarrier Signal to Interference plus Noise Ratio meets the demands, if satisfy, then stops iteration, Output rusults, otherwise forward step 2 to.
The angle that this embodiment optimizes from multi-plot joint is considered the co-allocation of carrier wave and power, the further utilance of elevator system resource.Simultaneously, this embodiment also adopts the distributed mode of finding the solution, and the distribution of carrier wave and power is finished independently by exchange message in the minizone, and then can realize parallel computation, has reduced the complexity of calculating.In addition, this embodiment combines allocation of carriers and power division, not only can improve the utilance of system resource, and can form rational interference profile.
In the 5th embodiment of the inventive method, as shown in Figure 2, suppose that the hexagonal cell that the collaboration region is R by K (for example, 7) radius forms, each residential quarter has respectively the user to gather U
k={ 1 .., n
kBe distributed in randomly inside, residential quarter.There is subcarrier set M={1 each residential quarter ..., m} etc. are to be allocated.Further suppose: (1) channel is frequency selective fading channels, each user position in transmission time interval carrier wave that remains unchanged in (2) each residential quarter is correspondingly distributed to a user, and the same carrier wave of different districts can be shared the carrier number r that each user assignment of use (3) obtains
iKnown in advance.Then order
Set for all users in the collaboration region.Under the constraint of user rate, many residential quarters subcarrier and power division problem can be described below:
R
i≥Q，i∈U (3)
Wherein, SINR
iThe SINR of user i on subcarrier j for the constraints requirement; G
i(j) be the path gain of user i on subcarrier j, for example, comprise path loss, shadow fading and antenna gain etc.;
The interference that user i is caused for other neighbor cell base station of using subcarrier j in the collaboration region; S (j) is user's set of using subcarrier j in K the residential quarter; R
iBe the speed that user i will reach, P
i(j) be the transmitting power of user i on subcarrier j, BN0 refers to the noise power of channel,
Be the neighbor cell base station b (h) of the user i that the uses subcarrier j path gain to user i, P
h(j) be the transmitting power of user h on subcarrier j.
Above-mentioned formula (1) is the optimization aim under formula (2) and (3) constraint, and wherein the Q value in the formula (3) can calculate by shannon formula (that is, Q ∝ C, C=Wlog
2(1+SINR)).For the Optimizing Allocation of above-mentioned many residential quarters, this embodiment adopts distributed solution, and the many residential quarters problem with formula (1)-(3) is divided into following a series of single cell allocation problem first:
Be constrained in:
Wherein, x
I, j=1 expression subcarrier j distributes to user i, x
I, j=0 expression subcarrier j is not yet assigned to user i; Pmax is the preset power thresholding (that is, maximum) of the transmitting power sum of all subcarriers in the Serving cell of user i.For the problem of this binary system linear optimization, can find the solution by the optimization instrument, obtain allocation result x
I, j(i ∈ U
k, j ∈ M) and each user's oneself transmitting power P
i(j).Because the power of current distribution is the co-channel interference of not considering other residential quarters, so this power can not satisfy user's rate requirement.Next need to carry out following iterative process:
Owing to consider the co-channel interference of other residential quarters, formula (2) can be decomposed into:
If formula (8) is the first half of formula (7), its transmitting power for increasing at subcarrier j:
If formula (9) is the latter half of formula (7), be initialized transmitting power:
Wherein, P
h(j) be the Initial Transs of other community users on subcarrier j.
The iterative step of this embodiment can be divided into following three steps:
(1) for each subcarrier j, calculate user's S set (j) of using subcarrier j in all residential quarters, then calculate the power Δ P that all users that use subcarrier j need to increase according to formula (8)
i(j), then, can obtain the transmitting power of the subcarrier j of a renewal:
P
i(j)＝ΔP
i(j)+P0
i(j) (10)
(2) calculate the SINR of all users on this subcarrier of subcarrier j place user's S set (j) according to formula (11), and judge whether this SINR meets the demands, if satisfy, then execution in step (1) enters next subcarrier j.
Otherwise, suppose:
P_new
i(j)＝P0
i(j)+ΔP
i(j)，i∈S(j) (12)
P_new
i(j)＝P_new
i(j)+βΔP
i(j) (13)
Wherein, β is the decimal between the 0-1, and its size can be decided according to actual conditions.
(3) recomputate the Signal to Interference plus Noise Ratio of each each subcarrier of user, calculate the improvement degree after twice iteration of each subcarrier Signal to Interference plus Noise Ratio of each user, minimum subcarrier and respective user thereof improve, if the improvement degree is less than certain threshold value, then in this user's current area, replace this subcarrier with the idle subcarrier that carries, if do not have idle subcarrier, then turn off this subcarrier with certain probability.Because each user may obtain N subcarrier, the N value can be decided according to actual conditions, in iterative process, the speed that reaches on some carrier wave may be greater than desired minimum speed limit, if at this moment close the poorest (channel the is frequency selectivity) subcarrier of other path gain of this user, total speed of this user still can reach requirement, then closes this subcarrier.The speed that algorithm ends at all users is met.
In addition, because the increase of available power always increases sooner than interference power, so above-described embodiment can not be absorbed in the endless loop of iteration.
Fig. 4 is the structural representation of first embodiment of apparatus of the present invention.
As shown in Figure 4, the device of this embodiment can comprise:
Power initialization module 11, be used for the Constraint-based condition and calculate the transmitting power of user i on the subcarrier j of its Serving cell in the collaboration region, and with user i on the subcarrier j of its Serving cell transmitting power and the base station in service sector of the user i user's of use subcarrier j in the neighbor cell of the Serving cell of user i path gain send to neighbor cell;
Power update module 12, link to each other with power initialization module 11, be used for to receive use the neighbor cell base station of the user i of subcarrier j to use the user's of subcarrier j transmitting power to the neighbor cell of the Serving cell of the path gain of user i and user i, and upgrade the transmitting power of user i on the subcarrier j of its Serving cell according to the path gain that receives and transmitting power;
Wherein, constraints can comprise: in the situation of each user's transmission rate greater than corresponding minimum transmission rate, minimize the transmitting power sum of all subcarriers in the collaboration region in the collaboration region; Transmitting power sum in the collaboration region on all subcarriers of each residential quarter is less than the preset power thresholding.
The angle that this embodiment optimizes from multi-plot joint is considered the co-allocation of carrier wave and power, can further promote the utilization ratio of resource.Simultaneously, adopt the distributed mode of finding the solution, the distribution of carrier wave and power is finished independently by exchange message in the minizone, can realize parallel computation, thereby has reduced the complexity of calculating.
Fig. 5 is the structural representation of second embodiment of apparatus of the present invention.
As shown in Figure 5, compare with embodiment among Fig. 4, the device of this embodiment also comprises:
Improvement threshold judge module 21 links to each other with SINR acquisition module 13, is used for judging that whether the difference of the SINR of user i on the subcarrier j of its Serving cell after adjacent twice iteration is less than improvement threshold;
Subcarrier is searched module 22, links to each other with improvement threshold judge module 21, is used in the situation of difference less than improvement threshold of Signal to Interference plus Noise Ratio SINR, searches whether there is idle subcarrier in the Serving cell of user i;
Subcarrier adjusting module 23, searching module 22 with subcarrier links to each other, be used in the situation that has idle subcarrier, using idle subcarrier to replace the subcarrier j of the Serving cell of user i, and in the situation that does not have idle subcarrier, close the subcarrier j in the Serving cell of user i with predetermined probability.
The transmitting power that this embodiment has considered to increase subcarrier has not only reduced the interference of minizone, but also makes the resource allocation process of whole system faster iteratively the abnormality processing of SINR when significantly improving.
Fig. 6 is the structural representation of the 3rd embodiment of apparatus of the present invention.
As shown in Figure 6, compare with embodiment among Fig. 4, the power update module 31 in the device of this embodiment comprises:
The user gathers determining unit 311, is used for the set that all users of subcarrier j are used in definite collaboration region;
Increment power calculation unit 312, gather determining unit 311 with the user and link to each other, be used for using the neighbor cell base station of the user i of subcarrier j in the neighbor cell of the Serving cell of the path gain of user i and user i, to use the user's of subcarrier j transmitting power to calculate the power of the required increase of user i according to the collaboration region;
Updating block 313 links to each other with increment power calculation unit 312, is used for obtaining transmitting power on the subcarrier j of New Consumers i at Serving cell more according to user i at the power of the transmitting power on the subcarrier j of its Serving cell and the required increase of user i.
This embodiment has considered to use the user of same sub-carrier to this user's interference with this user in the neighbor cell when upgrading user emission power, thereby, in the situation that satisfies user's transmission rate, can effectively reduce the interference of inter-cell user.
In the above-described embodiments, each user assignment in each residential quarter of collaboration region has different subcarriers.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are apparent for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment with various modifications that the present invention's design is suitable for special-purpose.
Claims (10)
1. the combined distributing method of an OFDMA system small area resource is characterized in that, described method comprises:
The Constraint-based condition is calculated the transmitting power of user i on the subcarrier j of Serving cell in the collaboration region, and with user i on the subcarrier j of Serving cell transmitting power and the base station in service sector of the user i user's of use subcarrier j in the neighbor cell of the Serving cell of user i path gain send to described neighbor cell;
Receive to use the neighbor cell base station of the user i of subcarrier j to use the user's of subcarrier j transmitting power in the neighbor cell of the Serving cell of the path gain of user i and user i, and upgrade the transmitting power of user i on the subcarrier j of Serving cell according to the path gain that receives and transmitting power;
Based on all use the user's of subcarrier j transmitting power to calculate the Signal to Interference plus Noise Ratio SINR of user i on the subcarrier j of Serving cell in the described collaboration region of upgrading;
Judge whether the SINR of user i on the subcarrier j of Serving cell satisfies the SINR thresholding of user i on subcarrier j, if do not satisfy the SINR thresholding of user i on subcarrier j, then increase the transmitting power of user i on the subcarrier j of Serving cell with predetermined step-length, and the transmitting power after will increasing continues to carry out the step of the Signal to Interference plus Noise Ratio SINR of described calculating user i on the subcarrier j of Serving cell as the transmitting power of upgrading, otherwise iteration finishes.
2. method according to claim 1 is characterized in that, whether the SINR on the subcarrier j of the described user of judgement i at Serving cell satisfied user i before the SINR thresholding on the subcarrier j, and described method also comprises:
Judge that whether the difference of the SINR of user i on the subcarrier j of Serving cell after adjacent twice iteration is less than improvement threshold;
If less than described improvement threshold, then in the Serving cell of user i, search whether there is idle subcarrier;
If there is idle subcarrier, then with the subcarrier j in the Serving cell of the subcarrier replacement user i of described free time, otherwise, close the subcarrier j in the Serving cell of user i with predetermined probability.
3. method according to claim 1 is characterized in that, described constraints comprises:
In described collaboration region, in the situation of each user's transmission rate greater than corresponding minimum transmission rate, minimize the transmitting power sum of all subcarriers in the described collaboration region;
Transmitting power sum in the described collaboration region on all subcarriers of each residential quarter is less than the preset power thresholding.
4. method according to claim 3 is characterized in that, the described step of upgrading the transmitting power of user i on the subcarrier j of Serving cell according to path gain and the transmitting power of reception comprises:
Determine to use in the described collaboration region all users' of described subcarrier j set;
In the neighbor cell of the Serving cell of the path gain of user i and user i, use the user's of subcarrier j transmitting power to calculate the power of the required increase of user i according to the neighbor cell base station of the user i that uses subcarrier j in the described collaboration region;
Obtain transmitting power on the subcarrier j of New Consumers i at Serving cell more according to user i at the power of the transmitting power on the subcarrier j of Serving cell and the required increase of user i.
5. method according to claim 1 is characterized in that, each user assignment in the described collaboration region in the same residential quarter has different subcarriers.
6. the co-allocation device of an OFDMA system small area resource is characterized in that, described device comprises:
The power initialization module, be used for the Constraint-based condition and calculate the transmitting power of user i on the subcarrier j of Serving cell in the collaboration region, and with user i on the subcarrier j of Serving cell transmitting power and the base station in service sector of the user i user's of use subcarrier j in the neighbor cell of the Serving cell of user i path gain send to described neighbor cell;
The power update module, link to each other with described power initialization module, be used for to receive use the neighbor cell base station of the user i of subcarrier j to use the user's of subcarrier j transmitting power to the neighbor cell of the Serving cell of the path gain of user i and user i, and upgrade the transmitting power of user i on the subcarrier j of Serving cell according to the path gain that receives and transmitting power;
The SINR acquisition module links to each other with described power update module, is used for based on all use the user's of subcarrier j transmitting power to calculate the Signal to Interference plus Noise Ratio SINR of user i on the subcarrier j of Serving cell in the described collaboration region of upgrading;
The iteration judge module, link to each other with described SINR acquisition module, be used for judging whether the SINR of user i on the subcarrier j of Serving cell satisfies the SINR thresholding of user i on subcarrier j, if do not satisfy the SINR thresholding of user i on subcarrier j, then increase the transmitting power of user i on the subcarrier j of Serving cell with predetermined step-length, and the transmitting power after will increasing is forwarded to described SINR acquisition module as the transmitting power of upgrading, otherwise iteration finishes.
7. device according to claim 6 is characterized in that, described device also comprises:
The improvement threshold judge module links to each other with described SINR acquisition module, is used for judging that whether the difference of the SINR of user i on the subcarrier j of Serving cell after adjacent twice iteration is less than improvement threshold;
Subcarrier is searched module, links to each other with described improvement threshold judge module, is used in the situation of difference less than described improvement threshold of described Signal to Interference plus Noise Ratio SINR, searches whether there is idle subcarrier in the Serving cell of user i;
The subcarrier adjusting module, searching module with described subcarrier links to each other, be used in the situation that has idle subcarrier, using the subcarrier of described free time to replace the subcarrier j of the Serving cell of user i, and in the situation that does not have idle subcarrier, close the subcarrier j in the Serving cell of user i with predetermined probability.
8. device according to claim 6 is characterized in that, described constraints comprises:
In described collaboration region, in the situation of each user's transmission rate greater than corresponding minimum transmission rate, minimize the transmitting power sum of all subcarriers in the described collaboration region;
Transmitting power sum in the described collaboration region on all subcarriers of each residential quarter is less than the preset power thresholding.
9. device according to claim 8 is characterized in that, described power update module comprises:
The user gathers determining unit, is used for the set that all users of described subcarrier j are used in definite described collaboration region;
The increment power calculation unit, gather determining unit with described user and link to each other, be used for using the neighbor cell base station of the user i of subcarrier j in the neighbor cell of the Serving cell of the path gain of user i and user i, to use the user's of subcarrier j transmitting power to calculate the power of the required increase of user i according to described collaboration region;
Updating block links to each other with described increment power calculation unit, is used for obtaining transmitting power on the subcarrier j of New Consumers i at Serving cell more according to user i at the power of the transmitting power on the subcarrier j of Serving cell and the required increase of user i.
10. device according to claim 6 is characterized in that, each user assignment in the described collaboration region in the same residential quarter has different subcarriers.
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| CN102857868B (en) * | 2011-06-30 | 2017-05-10 | 中兴通讯股份有限公司 | Device and method for sending unicast services |
| CN103582088A (en) * | 2012-07-25 | 2014-02-12 | 北京三星通信技术研究有限公司 | Base station cooperation sleep/rouse method and system |
| CN103067964B (en) * | 2012-12-25 | 2017-02-22 | 上海无线通信研究中心 | Coordination method and system for predicting interference |
| CN110855407B (en) * | 2016-03-31 | 2020-12-08 | 华为技术有限公司 | Information transmission method, transmission device, communication device, and readable storage medium |
| CN107360622A (en) * | 2017-05-25 | 2017-11-17 | 中国电子科技集团公司电子科学研究院 | The cooperation resource allocation methods and device of a kind of orthogonal frequency network |
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| CN101741437A (en) * | 2008-11-19 | 2010-06-16 | 中国移动通信集团公司 | Uplink power control method, system and equipment |
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