CN102655645B - Relative-narrowband-TX-power (RNTP)-based interference suppression method in long-term evolution (LTE) system - Google Patents

Relative-narrowband-TX-power (RNTP)-based interference suppression method in long-term evolution (LTE) system Download PDF

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CN102655645B
CN102655645B CN201110048784.1A CN201110048784A CN102655645B CN 102655645 B CN102655645 B CN 102655645B CN 201110048784 A CN201110048784 A CN 201110048784A CN 102655645 B CN102655645 B CN 102655645B
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subcarrier
base station
user
edge
edge subcarrier
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CN102655645A (en
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王莹
张纬栋
王坦
张珂
凌丽莎
姚文清
孟艳
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Petevio Institute Of Technology Co ltd
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Potevio Institute of Technology Co Ltd
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Abstract

The invention provides a relative-narrowband-TX-power (RNTP)-based interference suppression method in a long-term evolution (LTE) system. The method comprises the following steps that: in an RNTP period, each base station selects an X% subcarrier with the lowest max{min(tau j')} from all subcarriers as an edge subcarrier; each base station informs another base station adjacent to the base station of not using the edge subcarrier selected by the base station through an RNTP signaling; and when clients are scheduled, each base station schedules a client with a lowest signal-to-interference-to noise-ratio onto the edge subcarrier selected by the base station. Due to the method, an effect of suppressing the interference can be greatly improved.

Description

Based on the disturbance restraining method of RNTP in a kind of LTE system
Technical field
The present invention relates to interference mitigation technology, particularly in a kind of LTE system based on the disturbance restraining method of RNTP.
Background technology
Presence of intercell interference (ICI) is an intrinsic problem of cell mobile communication systems.The descending interference of LTE system indoor scene is mainly derived from co-channel interference, and namely different districts uses the ICI brought during similar frequency bands, have impact on the performance of edge customer greatly.In order to promote the throughput performance of edge customer, keeping the throughput of the entirety of community to a certain extent simultaneously, needing to adopt interference coordination technique.
At present, under LTE system framework, the solution of AF panel is divided into two kinds: frequency domain planning and power adjustment.Simply introduce respectively below.
One, frequency domain planning is adopted:
1, static interference coordination mode in traditional IC IC, specifically comprises soft-frequency reuse and partial frequency multiplexing.
1) soft-frequency reuse: the frequency duplex factor as one of center of housing estate is 1, the frequency duplex factor as one of cell edge is 3.As shown in Figure 1, the less transmitting power of sub-band that center of housing estate is used, is set to Pintra; The larger transmitting power of sub-band that cell edge is used, is set to Pedge.Definition Power Radio=Pintra/Pedge.Along with Power Radio adjusts, the corresponding adjustment of quantity of CEU (Cell Center User) and CCU (Cell Edge User).
2) partial frequency multiplexing: partial frequency multiplexing on frequency planning and soft-frequency reuse be identical, be all that center of housing estate CCU is entirely multiplexing, cell edge CEU is orthogonal.Do not adopt power to control unlike partial frequency multiplexing, namely do not have power layering, the power division on whole subdistrict frequency band is divided equally.
2, dynamic frequency is multiplexing: only need when scheme realizes to understand the information such as path loss, rate requirement of user and total loading condition of system, carry out Resourse Distribute.Owing to disturbing the division in territory without clear and definite position boundary, do not need to carry out the network planning in advance.After the ratio determining to disturb territory and frequency multiplexing mode, every community adopts the resource allocation mode determined, and marks off corresponding frequency band preference, and corresponding frequency range carries out power adjustment.
Two, adopt power adjustment: LTE system is descending only adopts power adjustment in some responsive frequency range, under the framework needing the frequency range of adjustment to specify in agreement, carry out appropriate amount of fine-tuning.LTE descending power Adjusted Option only uses the power based on RNTP to adjust, without other technologies support.
Power based on RNTP adjusts: RNTP thresholddefine a thresholding, by RNTP (n pRB) whether the transmitting power that indicates each PRB to use with the form of bit diagram exceed this thresholding.RNTP (n pRB) determined by following formula:
Wherein, RNTP (n pRB) be indication bit figure, n pRBrepresent the sequence number of PRB, E a(n pRB) be the transmitting power of the data subcarrier do not comprised in the OFDM symbol of reference symbol.In addition,
RNTP threshold＝∈{-∞,-11,-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0,+1,+2,+3}[dB]。
E max _ nom ( p ) = P max ( p ) · 1 Δf N RB DL · N SC RB .
By these information mutual between community, realize interference coordination.
In the descending indoor scene evaluate simulation of LTE, modulation coding mode more than 95% is 64QAM.And specify in 3GPP agreement, do not adopt any power to adjust for 64QAM.Therefore AF panel cannot be carried out by power adjustment under indoor scene.That is, the interference coordination schemes under indoor scene should have been planned by frequency domain.
The frequency adjusted for soft-frequency reuse and fractional frequency reuse plan interference coordination mode is slower, much larger than the duration of a service conversation, cause frequency domain dispatching unreasonable, contrast full rate is multiplexing, its availability of frequency spectrum reduces, and cause the blindness that user's frequency domain is planned, in frequency selection scheduling repeated dispensing, the initial subcarrier that edge customer distributes and scheduling sub-carriers are different, secondary distribution likely causes new allocation result edge customer different from original allocation result edge customer, optimization aim loses meaning, throughput degradation.
Meanwhile, the negotiation limited due to resource and enforcement complete when on-premise network, adjust in long time in the period of network operation.Frequency range planning on all exists can not adaptive channel change inferior position, also bring the accuracy problem based on frequency selection scheduling accordingly.
Due under indoor scene, user moving speed slowly, channel decline soon change in gain corresponding be also at a slow speed, so based on several TTI or tens TTI dynamic frequency multiplexing scheme in actual applications, expense is larger, due to frequency range planning blindness, even if dynamically frequency domain planning also can not bring expection gain.
Summary of the invention
The invention provides the disturbance restraining method based on RNTP in a kind of LTE system, the effect of AF panel can be improved.
For achieving the above object, the present invention adopts following technical scheme:
Based on a disturbance restraining method of RNTP in LTE system, comprising:
Within the RNTP cycle, each base station is satisfying condition when, in all subcarriers, select max{min (Γ j') minimum X% subcarrier, as edge subcarrier; Wherein, Γ j' channel capacity value for the single sub-carrier that is scheduled distributes, X% is default edge subcarrier ratio;
Each base station by its adjacent base station of RNTP signaling forbidding described each base station selected go out edge subcarrier, when carrying out user scheduling, user the poorest for current Signal to Interference plus Noise Ratio is dispatched on the edge subcarrier self selected by described each base station successively.
Preferably, describedly in all subcarriers, max{min (Γ is selected j') minimum X% subcarrier is:
For user's fixed allocation sub-carrier resources, determine the channel capacity value of each subcarrier j be scheduled wherein, p jifor resource j distributes to the power of user i, g ijfor the product of path loss and subcarrier gains;
Minimum X% subcarrier is selected, as edge subcarrier in the channel capacity value calculated.
Preferably, describedly for user's fixed allocation sub-carrier resources be: be user's allocation of subcarriers resource according to Proportional-Fair algorithm;
The channel capacity value of each subcarrier described is: wherein, β is the equitable proportion factor, I jfor the interference suffered by a jth subcarrier.
Preferably, in described each base station user the poorest for current Signal to Interference plus Noise Ratio is dispatched to successively on the edge subcarrier self selected and is:
According to the user scheduling in current TTI and sub carries allocation, calculate the Signal to Interference plus Noise Ratio of each user, and sort according to Signal to Interference plus Noise Ratio order from low to high;
According to the channel capacity value order from low to high of edge subcarrier, the user after sequence is dispatched on edge subcarrier, successively until the Resourse Distribute of edge subcarrier is complete.
Preferably, be assigned to when selecting edge subcarrier user on edge subcarrier different from the user be dispatched to after sequence described in current TTI on edge subcarrier time, the method comprises further: carry out secondary distribution, is dispatched on the subcarrier that the user on edge subcarrier is assigned with in this TTI by the user scheduling be assigned on edge subcarrier when selecting edge subcarrier in current TTI after described sequence.
Preferably, described each base station by its adjacent base station of RNTP signaling forbidding described each base station selected go out edge subcarrier be:
Described RNTP signaling comprises the bit diagram be mapped on each PRB; For the edge subcarrier of described each base station, be set to effectively by the bit value of corresponding for this subcarrier PRB, it is invalid to be set to by the bit value of corresponding for all the other subcarriers PRB;
Described adjacent base station receives described RNTP signaling, and the transmitting power wherein bit value being set to subcarrier corresponding to effective PRB is set to 0, and the subcarrier that bit value is set to invalid PRB corresponding normally sends.
Preferably, the method comprises further: for any two adjacent base stations, and arranging one of them base station is dominant base, and another base station is prothetic group station;
When prothetic group station receives the described notice of dominant base and the subcarrier forbidden in this notice is the edge subcarrier at described prothetic group station, this edge subcarrier is forbidden at described prothetic group station, not by user scheduling on this edge subcarrier;
When dominant base receives the described notice at prothetic group station and the subcarrier forbidden in this notice is the edge subcarrier of described dominant base, described dominant base does not forbid this edge subcarrier, by user scheduling on this edge subcarrier.
Preferably, in the beginning in each RNTP cycle, described dominant base and prothetic group station exchange.
Preferably, the method comprises further: when described prothetic group stands in and sends RNTP signaling, by max{min (Γ in other subcarriers except edge subcarrier j') minimum Y% subcarrier as forbidding subcarrier, notify described dominant base;
Described dominant base is after determining the subcarrier forbidden, if the subcarrier of the forbidding determined is greater than X%, then the subcarrier of Stochastic choice X% is forbidden.
Preferably, X=Y=30.
Preferably, the method comprises further: for any two adjacent base stations, when one of them base station receives the described notice of another base station and the subcarrier forbidden in this notice is the edge subcarrier of one of them base station described, this edge subcarrier is not forbidden in one of them base station described, by user scheduling on this edge subcarrier.
Preferably, X=30.
As seen from the above technical solution, in the present invention, within the RNTP cycle, each base station is satisfying condition when, in all subcarriers, select max{min (Γ j') minimum X% subcarrier, as edge subcarrier; Wherein, Γ j' channel capacity value for the single sub-carrier that is scheduled distributes, X% is default edge subcarrier ratio; Each base station by its adjacent base station of RNTP signaling forbidding described each base station selected go out edge subcarrier, when carrying out user scheduling, user the poorest for current Signal to Interference plus Noise Ratio is dispatched on the edge subcarrier self selected by described each base station successively.By the way, improve the performance of edge subcarrier in each base station, greatly reduce the interference of neighbor cell, and by the user scheduling of poor-performing on this edge subcarrier, thus reduce the interference of neighbor cell suffered by these users.
Accompanying drawing explanation
Fig. 1 is current soft-frequency reuse schematic diagram;
Fig. 2 is the particular flow sheet of disturbance restraining method in the embodiment of the present invention.
Embodiment
For making object of the present invention, technological means and advantage clearly understand, below in conjunction with accompanying drawing, the present invention is described in further details.
Basic thought of the present invention is: the subcarrier that performance is poor, by the calculating of sub-carrier channels capability value, is determined in each community, and notifies that the poor subcarrier of these Performance Ratios is being forbidden in neighbor cell, thus reduces the adjacent cell interference suffered by these subcarriers; Meanwhile, by user scheduling low for this community SINR on the poor subcarrier of these Performance Ratios, thus reduce the adjacent cell interference suffered by these users.
Next describe the present invention.
The present invention is directed to indoor scene analysis, its network topology structure is rectangle.Assuming that a topology area Zhong Youliangge community, as shown in Figure 2.The symbol related in the present invention is summarized as follows:
Base station side:
User side:
If N number of subcarrier resource distribution is to m user in kth root antenna, then those skilled in the art are known, and channel matrix is as follows:
G ( k ) = g 11 g 12 . . . g 1 N g 21 g 22 . . . g 2 N . . . . . . . . . . . . g m 1 g m 2 . . . g mN - - - ( 1 )
If do not consider power distribution strategies, each resource distributes power:
G ( k ) × P ( k ) = g 11 p 11 g 12 p 21 . . . g 1 N p N 1 g 21 p 12 g 22 p 22 . . . g 2 N p N 2 . . . . . . . . . . . . g m 1 p 1 m g m 2 p 2 m . . . g mN p Nm - - - ( 2 )
Due in LTE downlink system, the interference suffered by user is from co-channel interference and have the impact of thermal noise, so the Signal to Interference plus Noise Ratio of subcarrier is as follows:
λ ( k ) = g 11 p 11 I 1 g 12 p 21 I 2 . . . g 1 N p N 1 I N g 21 p 12 I 1 g 22 p 22 I 2 . . . g 2 N p N 2 I N . . . . . . . . . . . . g m 1 p 1 m I 1 g m 2 p 2 m I 2 . . . g mN p Nm I N - - - ( 3 )
The channel capacity of user i is:
Wherein,
Being calculated as follows of allocated channel capability value on single sub-carrier:
Wherein, I ijfor the interference value that user i is subject on a jth carrier resource.In the present invention, AF panel is mainly for edge cell user, ites is desirable to promote edge cell user throughput, and again because subscriber channel gain is mainly derived from large scale decline, target function should be and promotes cell edge subcarrier spectrum utilance.Following optimization problem can be obtained thus:
max{min(Γ j')} (7)
for the channel capacity value that the single sub-carrier that is scheduled distributes, P tfor total transmitting power.
Namely the present invention utilizes above-mentioned optimal way to carry out Resourse Distribute, reduces adjacent cell interference.Particularly, the present invention carries out AF panel in units of the RNTP cycle.Within each RNTP cycle, first the subcarrier needing to carry out AF panel is determined, then, when each TTI within this RNTP cycle carries out user scheduling, the user scheduling of poor-performing is carried out to these on subcarrier of AF panel, to reduce the interference of adjacent cell to these users.
The basic disturbance restraining method of concrete the present invention comprises:
Step 101, within the RNTP cycle, each base station is satisfying condition when, in all subcarriers, select max{min (Γ j') minimum X% subcarrier, as edge subcarrier.
Wherein, X% is default edge subcarrier ratio; The carrier wave ratio that AF panel can be optimized and carry out in base station is as required arranged.For these edge subcarriers, make the interference of adjacent cell suffered by it be 0 as far as possible.
Step 102, each base station by its adjacent base station of RNTP signaling forbidding each base station selected go out edge subcarrier, when each TTI within this RNTP cycle carries out user scheduling, user the poorest for current Signal to Interference plus Noise Ratio is dispatched on the edge subcarrier self selected in this RNTP cycle by each base station successively.
In this step, base station A utilizes RNTP signaling adjacent base station to forbid the edge subcarrier of base station A, and like this, suffered by the edge subcarrier of base station A, adjacent cell interference is 0; Then, base station A is when each TTI carries out user scheduling, again by the user scheduling of poor-performing on the edge subcarrier of base station A having carried out AF panel, suffered by these edge subcarriers, the interference of adjacent cell is 0, therefore, the interference of the adjacent cell suffered by user being assigned with these edge subcarriers also will reduce greatly.
Wherein, when specifically carrying out the user scheduling in TTI, first can calculate the SINR of each user, then sort from low to high according to SINR, successively by sequence after user scheduling on edge subcarrier, until edge subcarrier is assigned with complete.In the process of dispatched users, edge subcarrier also can be sorted according to channel capacity, successively by the edge subcarrier after the user scheduling after sequence to sequence, also edge subcarrier can not be sorted, and by the user's random schedule after sequence on edge subcarrier.
So far, basic in the present invention disturbance restraining method flow process terminates.By the way, within each RNTP cycle, subcarrier lower for channel capacity can both be carried out AF panel, and by user scheduling by the user scheduling of poor-performing on the edge subcarrier through AF panel, improve the data transmission performance of user.Meanwhile, above-mentioned disturbance restraining method carries out in units of the RNTP cycle, and the time granularity of frequency domain planning diminishes, and can rationally change by adaptive channel; And overcome the blindness of frequency domain planning, saving under indoor scene need not expense; Transmit effective frequency planning information in real time by RNTP message, save secondary distribution for the poorest subcarrier in edge, what ensure optimization is the poorest subcarrier, and does not lose the subcarrier of better performances because the performance that secondary distribution is brought is lost.
In the step 101 of above-mentioned basic disturbance restraining method, max{min (Γ j') calculating be nondeterministic polynomial problem (NP) problem in optimum theory, need to solve and P jitwo Variables.First can determine that Resourse Distribute namely , obtain optimal solution, carry out power division according to the resource allocation conditions after solving; Or also can first determine power division and P ji, obtain optimal solution, carry out Resourse Distribute according to the power allocation case after solving.Existing various mode specifically can be utilized to carry out.
Here, adopt first kind of way, namely first determine that the mode that Resourse Distribute carries out power division is again that example illustrates specific embodiment of the invention.
Fig. 2 is the particular flow sheet of disturbance restraining method in the embodiment of the present invention.Wherein, be described for two adjacent base stations.As shown in Figure 2, the method comprises:
Step 201, in the beginning in each RNTP cycle, base station A fixes subcarrier resource distribution for user, determines the channel capacity value Γ of each subcarrier that is scheduled j'.
Particularly, consider the fairness between user, adopt PF algorithm to carry out Resourse Distribute.Wherein path loss and subcarrier gains product g ijcan by calculating.After subcarrier resource distribution, in formula (7) just can determine.So, can obtain wherein, β is the equitable proportion factor in PF algorithm, can determine after Resourse Distribute.
Because interference comes from co-channel interference, meanwhile, consider that modulation coding mode more than 95% is 64QAM, and specifies in 3GPP agreement, does not adopt any power to adjust, therefore variable P for 64QAM in the descending indoor scene evaluate simulation of LTE jican only be 0 or P average, that is, in the present invention, the value of power division can be 0 or average power.So when the Resourse Distribute factor is determined, adopt the means of frequency domain planning, function to achieve the objective (7).
Step 202, the base station A X% subcarrier that selective channel capability value is minimum in all subcarriers that is scheduled, as the edge subcarrier of this base station.
Wherein, X% can pre-set as required, is set to 30% here.
Step 203, base station A, by its adjacent base station of RNTP signaling B, forbids the edge subcarrier of base station A.
In the present invention, the RNTP cycle is 200ms, and therefore every 200ms transmits a RNTP signaling.RNTP signaling transmits between base station with the form of bit diagram, and the bit mapping in this bit diagram is on each PRB.For the edge subcarrier of base station A, be set to effectively by the bit value of corresponding for this subcarrier PRB, it is invalid to be set to by the bit value of corresponding for all the other subcarriers PRB; Bit value is 0 for " effectively " representative receives base station B transmitted power on this PRB, and bit value is that engineering noise representative reception base station B normally sends on this PRB.Bit value specifically can be set for " 1 " representative " effectively ", bit value be set and represent engineering noise for " 0 ".
Like this, base station B no longer dispatched users on the edge subcarrier of base station A, thus make the interference of base station B suffered by the edge subcarrier of base station A be 0.
Step 204, when each TTI carries out user scheduling, base station A calculates the SINR of each user, and user the poorest for current Signal to Interference plus Noise Ratio is dispatched to successively on the edge subcarrier of base station A.
The process of this step is identical with user scheduling in the TTI of abovementioned steps 102, namely sorts from low to high according to SINR, successively by sequence after user scheduling on edge subcarrier, until edge subcarrier is assigned with complete.
In addition, because the dispatching cycle of TTI is shorter than the RNTP cycle, therefore, within a RNTP cycle, there is multiple TTI, can user scheduling be re-started in each TTI, different when user scheduling now may start from the RNTP cycle, identical user may be assigned with different subcarriers.Therefore, calculate the SINR of user in each TTI after, the subcarrier be assigned with when the subcarrier that the user of poor-performing is assigned with started from the RNTP cycle is different.At this moment, need to carry out secondary distribution, be assigned on edge subcarrier with the user that guaranteed performance is the poorest.Particularly, the user of poor-performing after sequence is dispatched on edge subcarrier successively, and on the subcarrier user of poor-performing after the user scheduling on edge subcarrier to sequence be assigned with in this TTI, has namely carried out resource exchange.
So far, the disturbance restraining method flow process in the embodiment of the present invention terminates.
The embodiment of the invention described above, carries out AF panel for a base station A and is illustrated.In actual applications, above-mentioned AF panel all can be carried out in each base station, and adjacent base station can to sending RNTP signaling each other, with transmission frequency open space planning.Because two neighbor cells interfere with each other, therefore may appear on same subcarrier, the RNTP signaling of two base station transmissions is all designated as effectively, namely there is identical edge subcarrier two base stations, all require that the other side forbids this subcarrier, here just there is the phenomenon of game, for the process of this situation, the present invention provides two kinds of strategies:
The first strategy:
For two adjacent base stations, base station A and base station B, arranging one of them base station is dominant base, and another base station is prothetic group station.With the cycle of RNTP for the cycle, upgrade dominant base and prothetic group station.According to said frequencies planing method, when each 200ms starts, mutually transmit RNTP signaling;
The RNTP signaling that two base stations send in conjunction with oneself and adjacent cell RNTP signaling, all PRB travel through:
1, the signaling that sends of dominant base, after prothetic group station receives, directly performs, and it is the PRB of " 1 " that forbidding receives PRB bit value in bit diagram; If reception bit diagram is 1 subcarrier corresponding to PRB be the edge subcarrier at prothetic group station, this prothetic group station also no longer by user scheduling on this edge subcarrier; Thus to ensure that the edge subcarrier of dominant base is disturbed be 0;
2, the signaling that sends of prothetic group station, after dominant base receives, in conjunction with this base station the RNTP bit diagram sent out determine the subcarrier that needs to forbid; If dominant base requires that on certain subcarrier its transmitted power is 0, the signaling at this PRB in this bit diagram of prothetic group station lost efficacy; That is, when prothetic group station notice dominant base forbidding subcarrier be the edge subcarrier of dominant base time, dominant base does not forbid this edge subcarrier, still by the user scheduling of poor performance on this edge subcarrier;
Due in the first strategy, prothetic group station may due to identical with the edge subcarrier of dominant base and cause part edge subcarrier cannot carry out AF panel, therefore, increase the quantity being set to " effectively " position in the RNTP signaling of prothetic group station transmission, thus ensure there are enough subcarriers carrying out AF panel in prothetic group station.Particularly, in the bit diagram that dominant base sends, the quantity of " 1 " is edge number of subcarriers, and the quantity of " effectively " position is greater than the quantity of edge subcarrier in the bit diagram that prothetic group station sends, the quantity of " effectively " position such as sent is 2 times of edge subcarrier, namely in all subcarriers performance the poorest 60%; Dominant base is being finished after bit diagram deletes according to the situation of self, can on the PRB that bit diagram is " effectively " position 30% (this strategy adopts Random assignment) of optional total bandwidth quantity.
The second strategy:
Two cell base station status are balanced, with the cycle of RNTP for the cycle, upgrade RNTP bit diagram each other;
According to said frequencies planing method, when each 200ms starts, mutually transmit RNTP signaling;
The signaling that arbitrary base station sends, after adjacent base station receives, if the subcarrier that the RPB being set to " effectively " is corresponding is the edge subcarrier of this adjacent base station, then this adjacent base station does not forbid this edge subcarrier, still by the user scheduling of poor-performing on this edge subcarrier.Here the bit diagram that sends of each base station comprise " effectively " position quantity be the edge number of subcarriers of this base station.
Above-mentionedly be specific implementation of the present invention.By the disturbance restraining method of the invention described above, based on RNTP technology, dynamically carry out frequency planning, greatly reduce the interference of adjacent cell, improve the transmission performance of user.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (12)

1. in LTE system based on a disturbance restraining method of RNTP, it is characterized in that, the method comprises:
Within the RNTP cycle, each base station is satisfying condition when, in all subcarriers, select max{min (Γ j') minimum X% subcarrier, as edge subcarrier; Wherein, Γ j' channel capacity value for the single sub-carrier that is scheduled distributes, X% is default edge subcarrier ratio, for the resource occupation factor, p ijfor resource j distributes to the power of user i, P tfor total transmitting power, N is the sub-carrier resources number of every root antenna, and m is the total number of users that every root antenna connects, and i is user index, and j is sub-carrier indices;
Each base station by its adjacent base station of RNTP signaling forbidding described each base station selected go out edge subcarrier, when carrying out user scheduling, user the poorest for current Signal to Interference plus Noise Ratio is dispatched on the edge subcarrier self selected by described each base station successively.
2. method according to claim 1, is characterized in that, describedly in all subcarriers, selects max{min (Γ j') minimum X% subcarrier is:
For user's fixed allocation sub-carrier resources, determine the channel capacity value of each subcarrier j be scheduled wherein, p ijfor resource j distributes to the power of user i, g ijfor the product of path loss and subcarrier gains, I ijfor the interference value that user i is subject on a jth carrier resource;
Minimum X% subcarrier is selected, as edge subcarrier in the channel capacity value calculated.
3. method according to claim 2, is characterized in that, describedly for user's fixed allocation sub-carrier resources is: be user's allocation of subcarriers resource according to Proportional-Fair algorithm;
The channel capacity value of each subcarrier described is: wherein, β is the equitable proportion factor, I jfor the interference suffered by a jth subcarrier.
4. method according to claim 1, is characterized in that, user the poorest for current Signal to Interference plus Noise Ratio to be dispatched to successively on the edge subcarrier self selected to be in described each base station:
According to the user scheduling in current TTI and sub carries allocation, calculate the Signal to Interference plus Noise Ratio of each user, and sort according to Signal to Interference plus Noise Ratio order from low to high;
According to the channel capacity value order from low to high of edge subcarrier, the user after sequence is dispatched on edge subcarrier, successively until the Resourse Distribute of edge subcarrier is complete.
5. method according to claim 4, it is characterized in that, be assigned to when selecting edge subcarrier user on edge subcarrier different from the user be dispatched to after sequence described in current TTI on edge subcarrier time, the method comprises further: carry out secondary distribution, is dispatched on the subcarrier that the user on edge subcarrier is assigned with in this TTI by the user scheduling be assigned on edge subcarrier when selecting edge subcarrier in current TTI after described sequence.
6. method according to claim 1, is characterized in that, described each base station by its adjacent base station of RNTP signaling forbidding described each base station selected go out edge subcarrier be:
Described RNTP signaling comprises the bit diagram be mapped on each PRB; For the edge subcarrier of described each base station, be set to effectively by the bit value of corresponding for this subcarrier PRB, it is invalid to be set to by the bit value of corresponding for all the other subcarriers PRB;
Described adjacent base station receives described RNTP signaling, and the transmitting power wherein bit value being set to subcarrier corresponding to effective PRB is set to 0, and the subcarrier that bit value is set to invalid PRB corresponding normally sends.
7., according to described method arbitrary in claim 1 to 6, it is characterized in that, the method comprises further: for any two adjacent base stations, and arranging one of them base station is dominant base, and another base station is prothetic group station;
When prothetic group station receives the described notice of dominant base and the subcarrier forbidden in this notice is the edge subcarrier at described prothetic group station, this edge subcarrier is forbidden at described prothetic group station, not by user scheduling on this edge subcarrier;
When dominant base receives the described notice at prothetic group station and the subcarrier forbidden in this notice is the edge subcarrier of described dominant base, described dominant base does not forbid this edge subcarrier, by user scheduling on this edge subcarrier.
8. method according to claim 7, is characterized in that, in the beginning in each RNTP cycle, described dominant base and prothetic group station exchange.
9. method according to claim 7, is characterized in that, the method comprises further: when described prothetic group stands in and sends RNTP signaling, by max{min (Γ in other subcarriers except edge subcarrier j') minimum Y% subcarrier as forbidding subcarrier, notify described dominant base;
Described dominant base is after determining the subcarrier forbidden, if the subcarrier of the forbidding determined is greater than X%, then the subcarrier of Stochastic choice X% is forbidden.
10. method according to claim 9, is characterized in that, X=Y=30.
11. according to described method arbitrary in claim 1 to 6, it is characterized in that, the method comprises further: for any two adjacent base stations, when one of them base station receives the described notice of another base station and the subcarrier forbidden in this notice is the edge subcarrier of one of them base station described, this edge subcarrier is not forbidden in one of them base station described, by user scheduling on this edge subcarrier.
12. methods according to claim 11, is characterized in that, X=30.
CN201110048784.1A 2011-03-01 2011-03-01 Relative-narrowband-TX-power (RNTP)-based interference suppression method in long-term evolution (LTE) system Expired - Fee Related CN102655645B (en)

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