CN102655645A - 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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CN102655645A
CN102655645A CN2011100487841A CN201110048784A CN102655645A CN 102655645 A CN102655645 A CN 102655645A CN 2011100487841 A CN2011100487841 A CN 2011100487841A CN 201110048784 A CN201110048784 A CN 201110048784A CN 102655645 A CN102655645 A CN 102655645A
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subcarrier
base station
user
edge
rntp
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CN102655645B (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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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

In a kind of LTE system based on the disturbance restraining method of RNTP
Technical field
The present invention relates to interference mitigation technology, in the particularly 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 indoor scene of LTE system is mainly derived from frequently disturbing, and the ICI that is brought when promptly different districts uses similar frequency bands has influenced the performance of edge customer greatly.In order to promote the throughput performance of edge customer, keep the throughput of the integral body of sub-district simultaneously to a certain extent, need to adopt interference coordination technique.
At present, under the LTE system framework, disturb the solution that suppresses to be divided into two kinds: frequency domain planning and power adjustment.Carry out brief account below respectively.
One, adopt frequency domain planning:
1, static interference coordination mode among the 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, and the frequency duplex factor as one of cell edge is 3.As shown in Figure 1, the used sub-band of center of housing estate is made as Pintra with less transmitting power; The used sub-band of cell edge is used bigger transmitting power, is made as Pedge.Definition PowerRadio=Pintra/Pedge.Along with Power Radio adjustment, the corresponding adjustment of quantity of CEU (Cell Center User) and CCU (Cell Edge User).
2) partial frequency multiplexing: partial frequency multiplexing is identical with soft-frequency reuse on frequency planning, all is that center of housing estate CCU is multiplexing entirely, cell edge CEU quadrature.Different is that partial frequency multiplexing does not adopt power control, does not promptly have the power layering, and the power division on the whole subdistrict frequency band is divided equally.
2, dynamic frequency is multiplexing: scheme only need be understood information such as user's path loss, rate requirement and system when realizing total loading condition, carry out resource allocation.Owing to disturb the division in territory not have clear and definite position boundary, need not carry out the network planning in advance.After confirming to disturb the ratio and frequency multiplexing mode in territory, the resource allocation mode of confirming is adopted in every sub-district, and marks off corresponding frequency range priority, on corresponding frequency range, carries out the power adjustment.
Two, adopt the power adjustment: the LTE system descending only adopts power adjustment in some responsive frequency range, under the framework of agreement regulation, carries out appropriate amount of fine-tuning for the frequency range of needs adjustment.LTE descending power adjustment scheme is only used the power adjustment based on RNTP, no other technologies support.
Power adjustment based on RNTP: RNTP ThresholdDefined a thresholding, by RNTP (n PRB) whether the transmitting power that will use with each PRB of the form of bit diagram indication surpass this thresholding.RNTP (n PRB) confirm by following formula:
Figure BSA00000442091700021
Wherein, RNTP (n PRB) be indication bit figure, n PRBThe sequence number of expression PRB, E A(n PRB) be the transmitting power that does not comprise the data subcarrier 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 .
Through mutual these information between the sub-district, realize interference coordination.
In the descending indoor scene evaluate simulation of LTE, modulation coding mode is 64QAM more than 95%.And in the 3GPP agreement, stipulate, do not adopt any power adjustment for 64QAM.Therefore under indoor scene, can't disturb inhibition through the power adjustment.That is to say that the interference coordination schemes under the indoor scene should be planned through frequency domain and accomplish.
Frequency for soft-frequency reuse and partial frequency multiplexing scheme interference coordination mode are adjusted is slower, much larger than the duration of a service conversation, causes frequency domain dispatching unreasonable; The contrast full rate is multiplexing; Its availability of frequency spectrum reduces, and causes the blindness of user's frequency domain planning, in frequency degree of recruiting repeated dispensing; Initial subcarrier and scheduling sub-carriers that edge customer distributed are different; Secondary distribution might cause new allocation result edge customer, and edge customer is different as a result with original allocation, and optimization aim loses meaning, and throughput descends.
Simultaneously, because the negotiation of resource limit and accomplishing when being implemented in on-premise network was adjusted in the long time in the period of network operation.All there is the inferior position that can not adaptive channel changes in the frequency range planning, also brings accuracy problem accordingly based on frequency degree of recruiting.
Because under the indoor scene; User moving speed is very slow; Channel decline soon change in gain corresponding also be at a slow speed, so based on the dynamic frequency multiplexing scheme of several TTI or tens TTI in practical application, expense is bigger; Because frequency range planning blindly, even dynamically frequency domain planning can not bring the expection gain yet.
Summary of the invention
The invention provides in a kind of LTE system based on the disturbance restraining method of RNTP, can improve and disturb the effect that suppresses.
For realizing above-mentioned purpose, the present invention adopts following technical scheme:
Based on the disturbance restraining method of RNTP, comprising in a kind of LTE system:
In cycle, each base station is at the s.t. ζ that satisfies condition at RNTP Ij=∈ 0,1};
Figure BSA00000442091700031
Figure BSA00000442091700032
Situation under, in all subcarriers, select max{min (Г j') minimum X% subcarrier, as the edge subcarrier; Wherein, Г j' be the channel capacity value of distributing on the single sub-carrier that is scheduled, X% is preset edge subcarrier ratio;
Each base station is through said each the base station selected edge subcarrier that goes out of its adjacent base station of RNTP signaling forbidding, carrying out the user when dispatching, and said each base station the user that current Signal to Interference plus Noise Ratio is the poorest be dispatched on the edge subcarrier of self selecting successively.
Preferably, the said max{min (Г that in all subcarriers, selects j') minimum X% subcarrier is:
Be user's fixed allocation sub-carrier resources, the channel capacity value of each the number of sub-carrier j that confirms to be scheduled
Figure BSA00000442091700033
Wherein,
Figure BSA00000442091700034
P JiFor resource j distributes to the power of user i, g IjBe the product of path loss and subcarrier gains;
In the channel capacity value that calculates, select minimum X% subcarrier, as the edge subcarrier.
Preferably, saidly for user's fixed allocation sub-carrier resources be: according to the direct ratio fair algorithm is user's allocation of subcarriers resource;
The channel capacity value of said each number of sub-carrier is:
Figure BSA00000442091700041
Wherein, β is the equitable proportion factor, I jIt is the suffered interference of j number of sub-carrier.
Preferably, the user that current Signal to Interference plus Noise Ratio is the poorest is dispatched to successively on the edge subcarrier of self selecting and is in said each base station:
According to scheduling of the user in the current TTI and subcarrier allocation, calculate each user's Signal to Interference plus Noise Ratio, 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 the ordering is dispatched on the edge subcarrier successively, the resource allocation of subcarrier finishes up to the edge.
Preferably; When selecting the edge subcarrier, be assigned to the user that is dispatched to after the said ordering in user and the current TTI on the edge subcarrier on the edge subcarrier not simultaneously; This method further comprises: carry out secondary distribution, be assigned to user on the edge subcarrier when selecting the edge subcarrier and be dispatched to and be dispatched to after the said ordering in the current TTI on the subcarrier that the user on the edge subcarrier is assigned with in this TTI.
Preferably, said each base station through said each the base station selected edge subcarrier that goes out of its adjacent base station of RNTP signaling forbidding is:
Said RNTP signaling comprises the bit diagram that is mapped on each PRB; For the edge subcarrier of said each base station, the bit value of the corresponding PRB of this subcarrier is set to effectively, and it is invalid that the bit value of the corresponding PRB of all the other subcarriers is set to;
Said adjacent base station receives said RNTP signaling, and wherein the bit value transmitting power that is set to the corresponding subcarrier of effective PRB is set to 0, and bit value is set to the corresponding subcarrier of invalid PRB and normally sends.
Preferably, this method further comprises: for any two adjacent base stations, it is dominant base that one of them base station is set, and another base station is the prothetic group station;
When the subcarrier that receives forbidding in said notice and this notice of dominant base when the prothetic group station was the edge subcarrier at said prothetic group station, said prothetic group station this edge subcarrier of forbidding was not dispatched to the user on this edge subcarrier;
When the subcarrier that receives forbidding in said notice and this notice at prothetic group station when dominant base was the edge subcarrier of said dominant base, said dominant base was not forbidden this edge subcarrier, and the user is dispatched on this edge subcarrier.
Preferably, in the beginning in each RNTP cycle, said dominant base and prothetic group station exchange.
Preferably, this method further comprises: said prothetic group stands in when sending the RNTP signaling, will other subcarriers except that the edge subcarrier in max{min (Г j') minimum Y% subcarrier is as the forbidding subcarrier, notifies said dominant base;
Said dominant base is behind the subcarrier of confirming forbidding, if the subcarrier of the forbidding of determining, is then selected the subcarrier forbidding of X% at random greater than X%.
Preferably, X=Y=30.
Preferably; This method further comprises: for any two adjacent base stations; When the subcarrier that receives forbidding in said notice and this notice of another base station when one of them base station is the edge subcarrier of said one of them base station; This edge subcarrier is not forbidden in said one of them base station, and the user is dispatched on this edge subcarrier.
Preferably, X=30.
Visible by technique scheme, among the present invention, in the cycle, each base station is at the s.t. ζ that satisfies condition at RNTP Ij=∈ 0,1};
Figure BSA00000442091700051
Figure BSA00000442091700052
Situation under, in all subcarriers, select max{min (Г j') minimum X% subcarrier, as the edge subcarrier; Wherein, Г j' be the channel capacity value of distributing on the single sub-carrier that is scheduled, X% is preset edge subcarrier ratio; Each base station is through said each the base station selected edge subcarrier that goes out of its adjacent base station of RNTP signaling forbidding, carrying out the user when dispatching, and said each base station the user that current Signal to Interference plus Noise Ratio is the poorest be dispatched on the edge subcarrier of self selecting successively.By the way, improve the performance of edge subcarrier in each base station, reduce the interference of neighbor cell greatly, and the user of poor-performing is dispatched on this edge subcarrier, thereby reduce the interference of the suffered neighbor cell of these users.
Description of drawings
Fig. 1 is present soft-frequency reuse sketch map;
Fig. 2 is the particular flow sheet of disturbance restraining method in the embodiment of the invention.
Embodiment
For making the object of the invention, technological means and advantage clearer, the present invention is explained further details below in conjunction with accompanying drawing.
Basic thought of the present invention is: the subcarrier that performance is poor is confirmed through the calculating of sub-carrier channels capability value in each sub-district, and notifies neighbor cell at the poor subcarrier of these performances of forbidding, thereby reduces the suffered adjacent area interference of these subcarriers; Simultaneously, this sub-district low user of SINR is dispatched on the poor subcarrier of these performances, thereby reduces the suffered adjacent area interference of these users.
Next describe the present invention.
The present invention is directed to indoor scene analysis, its network topology structure is a rectangle.Supposing has two sub-districts in a topology area, as shown in Figure 2.The symbol that relates among the present invention is summed up as follows:
Base station side:
Figure BSA00000442091700061
User side:
Figure BSA00000442091700062
Figure BSA00000442091700071
If m user given in the resource allocation of N number of sub-carrier in the k root antenna, then those skilled in the art can know, channel matrix is following:
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 consideration of power distribution strategy not distributes power on each resource:
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 )
Because in the LTE downlink system, the suffered interference of user is from the influence of frequently disturbing and have thermal noise, so the Signal to Interference plus Noise Ratio of subcarrier is following:
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:
C i = Σ j = 1 N log 2 ( 1 + ζ ij g ij P ji I j ) , i = 1,2 . . . m ; - - - ( 4 )
Wherein,
Figure BSA00000442091700076
The calculating of allocated channel capability value is following on the single sub-carrier:
Γ j = log 2 ( 1 + ζ ij g ij P ji I ij ) , j = 1,2 . . . N ; - - - ( 6 )
Wherein, I IjThe interference value that on j carrier resource, receives for user i.Disturb among the present invention and suppress to be primarily aimed at the edge cell user, hope can promote the edge cell user throughput, and again because the subscriber channel gain mainly is derived from the large scale decline, target function should be and promotes cell edge subcarrier spectrum utilance.Can obtain following optimization problem thus:
max{min(Г j′)} (7)
S.t. ζ Ij=∈ 0,1};
Figure BSA00000442091700082
Figure BSA00000442091700083
Г j' be the channel capacity value of distributing on the single sub-carrier that is scheduled, P tBe total transmitting power.
The present invention promptly utilizes above-mentioned optimal way to carry out resource allocation, reduces adjacent area interference.Particularly, the present invention is that unit disturbs inhibition with the RNTP cycle.At each RNTP in the cycle; At first confirm to disturb the subcarrier of inhibition, then, carry out the user when dispatching at this RNTP each TTI in the cycle; The user of poor-performing is dispatched on these subcarriers that disturb inhibition, to reduce of the interference of adjacent sub-district these users.
The concrete basic disturbance restraining method of the present invention comprises:
Step 101, in the cycle, each base station is at the s.t. ζ that satisfies condition at RNTP Ij=∈ 0,1};
Figure BSA00000442091700084
Situation under, in all subcarriers, select max{min (Г j') minimum X% subcarrier, as the edge subcarrier.
Wherein, X% is preset edge subcarrier ratio; The base station can optimize and disturb the carrier wave ratio of inhibition to be provided with as required.For these edge subcarriers, the interference that as far as possible makes its suffered adjacent sub-district is 0.
Step 102; Each base station is through each base station selected edge subcarrier that goes out of its adjacent base station of RNTP signaling forbidding; Carry out the user when dispatching at this RNTP each TTI in the cycle, each base station user that current Signal to Interference plus Noise Ratio is the poorest is dispatched on the edge subcarrier that this RNTP self selects in the cycle successively.
In this step, base station A utilizes the edge subcarrier of RNTP signaling adjacent base station forbidding base station A, and like this, the suffered adjacent area interference of the edge subcarrier of base station A is 0; Then; Base station A carries out the user when dispatching at each TTI; User with poor-performing is dispatched on the edge subcarrier of the base station A that has carried out the interference inhibition again; Because the interference of these suffered adjacent sub-districts of subcarrier, edge is 0, therefore, the suffered adjacent area interference of user that is assigned with these edge subcarriers also will reduce greatly.
Wherein, specifically carry out user in the TTI when dispatching, can calculate each user's SINR earlier, sort from low to high according to SINR then, the user after will sorting successively is dispatched on the edge subcarrier, and subcarrier is assigned with and finishes up to the edge.In the process of dispatched users; Can the edge subcarrier also be sorted according to channel capacity; User after will sorting successively is dispatched on the edge subcarrier after the ordering, also can the edge subcarrier not sorted, and the user's random schedule after will sorting is to the edge subcarrier.
So far, basic disturbance restraining method flow process finishes among the present invention.By the way; At each RNTP in the cycle; Can both disturb inhibition by the subcarrier that channel capacity is lower, and be dispatched to through disturbing on the edge subcarrier that suppresses, improve the user's data transmission performance through the user of user's scheduling with poor-performing.Simultaneously, above-mentioned disturbance restraining method is that unit carries out with the RNTP cycle, and the time granularity of frequency domain planning diminishes, and rationally adaptive channel changes; And overcome the blindness of frequency domain planning, under indoor scene, saving need not expense; Through the effective frequency planning information of RNTP Message Real Time transmission, save secondary distribution for the poorest subcarrier in edge, what guarantee to optimize is the poorest subcarrier, and do not lose better performances subcarrier because the performance that secondary distribution is brought lose.
In the step 101 of above-mentioned basic disturbance restraining method, max{min (Г j') calculating be a nondeterministic polynomial problem (NP) problem in optimum theory, need find the solution ζ IjAnd P JiTwo variablees.Can confirm at first that resource allocation is ζ Ij, obtain optimal solution, carry out power division according to the resource allocation conditions after finding the solution; Can confirm at first also that perhaps power division is P Ji, obtain optimal solution, carry out resource allocation according to the power division situation after finding the solution.Specifically can utilize existing variety of way to carry out.
Here, adopt first kind of mode, confirm earlier that promptly it is that example is explained practical implementation of the present invention that the mode of power division is carried out in resource allocation again.
Fig. 2 is the particular flow sheet of disturbance restraining method in the embodiment of the invention.Wherein, be that example describes with two adjacent base stations.As shown in Figure 2, this method comprises:
Step 201, in the beginning in each RNTP cycle, base station A is the fixing subcarrier resource distribution of user, confirms the channel capacity value Г of each subcarrier that is scheduled j'.
Particularly, consider the fairness between the user, adopt the PF algorithm to carry out resource allocation.Wherein path loss and subcarrier gains product g IjCan be through calculating.After subcarrier resource distribution finishes, ζ in the formula (7) IjJust can confirm.So; Can obtain
Figure BSA00000442091700101
wherein; β is the equitable proportion factor in the PF algorithm, after resource allocation finishes, can confirm.
Come from disturbing frequently because disturb, simultaneously, consider that modulation coding mode is 64QAM more than 95%, and in the 3GPP agreement, stipulates in the descending indoor scene evaluate simulation of LTE, do not adopt any power adjustment for 64QAM, so variable P JiCan only be 0 or P Average, that is to say that the value of power division can be 0 or average power among the present invention.So under the situation that the resource allocation factor has been confirmed, adopt the means of frequency domain planning, realize target function (7).
Step 202, base station A is the minimum X% subcarrier of selective channel capability value in all are scheduled subcarrier, as the edge subcarrier of this base station.
Wherein, X% can be provided with as required in advance, is set to 30% here.
Step 203, base station A is forbidden the edge subcarrier of base station A through its adjacent base station of RNTP signaling B.
Among the present invention, the RNTP cycle is 200ms, therefore every 200ms transferring primary RNTP signaling.The RNTP signaling is to transmit between the base station with the form of bit diagram, and the bit on this bit diagram is mapped on each PRB.For the edge subcarrier of base station A, the bit value of the corresponding PRB of this subcarrier is set to effectively, and it is invalid that the bit value of the corresponding PRB of all the other subcarriers is set to; 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 be " 1 " representative " effectively ", bit value is set represent engineering noise for " 0 ".
Like this, base station B dispatched users no longer on the edge of base station A subcarrier, thus make that the interference of the suffered base station B of edge subcarrier of base station A is 0.
Step 204 is carried out the user when dispatching at each TTI, and base station A calculates each user's SINR, and the user that current Signal to Interference plus Noise Ratio is the poorest is dispatched on the edge subcarrier of base station A successively.
The user dispatches identically in the TTI of the processing of this step and abovementioned steps 102, promptly sorts from low to high according to SINR, and the user after will sorting successively is dispatched on the edge subcarrier, and subcarrier is assigned with and finishes up to the edge.
In addition, because the dispatching cycle of TTI is shorter than the RNTP cycle, therefore; In cycle, there are a plurality of TTI at a RNTP, in each TTI, all can carry out user's scheduling again; Different when user's scheduling of this moment possibly begin with the RNTP cycle, identical user possibly be assigned with different subcarriers.Therefore, behind calculating user's the SINR, the subcarrier that the subcarrier that the user was assigned with of poor-performing is assigned with when beginning with the RNTP cycle is different in each TTI.At this moment, need carry out secondary distribution, the poorest user is assigned on the edge subcarrier with guaranteed performance.Particularly, the user of ordering back poor-performing is dispatched on the edge subcarrier successively, and the user on the edge subcarrier is dispatched on the subcarrier that the user of ordering back poor-performing is assigned with in this TTI, just carried out the resource exchange.
So far, the disturbance restraining method flow process in the embodiment of the invention finishes.
The embodiment of the invention described above, disturbing inhibition with a base station A is that example is illustrated.In practical application, each base station all can be carried out above-mentioned interference and suppressed, and adjacent base station can be to sending the RNTP signaling, with transmission frequency planning content each other.Because two neighbor cells interfere with each other; Therefore possibly appear on the same subcarrier, the RNTP signaling of two base station transmissions all is designated as effectively, and promptly there is identical edge subcarrier two base stations; All require the other side to forbid this subcarrier; Here the phenomenon that just has game, for the processing of this situation, the present invention provides two kinds of strategies:
First kind of strategy:
For two adjacent base stations, base station A and base station B, it is dominant base that one of them base station is set, another base station is the prothetic group station.Cycle with RNTP is the cycle, upgrades dominant base and prothetic group station.According to the said frequencies planing method, when each 200ms begins, transmit the RNTP signaling each other;
Two base stations combine own RNTP signaling and the adjacent sub-district RNTP signaling of being sent, and on all PRB, travel through:
1, the signaling that dominant base sent after receive at the prothetic group station, is directly carried out, and the PRB bit value is the PRB of " 1 " on the forbidding reception bit diagram; If be that the corresponding subcarrier of 1 PRB is the edge subcarrier at prothetic group station on the reception bit diagram, this prothetic group station also no longer is dispatched to the user on this edge subcarrier; Thereby the suffered interference of edge subcarrier that guarantees dominant base is 0;
2, the signaling of prothetic group station transmission after dominant base is received, is confirmed the subcarrier that needs are forbidden in conjunction with the RNTP bit diagram that this base station is sent out; If dominant base requires its transmitted power on certain number of sub-carrier be 0, the signaling at this PRB on this bit diagram of prothetic group station lost efficacy; That is to say that when the subcarrier of prothetic group station notice dominant base forbidding was the edge subcarrier of dominant base, dominant base was not forbidden this edge subcarrier, still the user with poor performance is dispatched on this edge subcarrier;
Because in first kind of strategy; The prothetic group station maybe be owing to disturbing inhibition with the identical part edge subcarrier that causes of edge subcarrier of dominant base; Therefore; Increase the quantity that is set to " effectively " position in the RNTP signaling of sending at the prothetic group station, thereby guarantee in the prothetic group station enough subcarriers that disturbs inhibition are arranged.Particularly; The quantity of " 1 " is the edge number of subcarriers in the bit diagram that dominant base sent; And in the bit diagram that the prothetic group station is sent the quantity of " effectively " position greater than the quantity of edge subcarrier; The quantity of " effectively " of for example sending is 2 times of edge subcarrier, promptly in all subcarriers performance the poorest 60%; Dominant base can be 30% (this strategy employing Random assignment) that the PRB of " effectively " position goes up optional total bandwidth quantity in bit diagram after finishing bit diagram according to the situation of self and deleting.
Second kind of strategy:
Two cell base station status are balanced, with cycle of RNTP be the cycle, upgrade RNTP bit diagram each other;
According to the said frequencies planing method, when each 200ms begins, transmit the RNTP signaling each other;
The signaling that send arbitrary base station; After adjacent base station is received; If be set to the edge subcarrier of the corresponding subcarrier of the RPB of " effectively " for this adjacent base station, then this adjacent base station is not forbidden this edge subcarrier, and still the user with poor-performing is dispatched on this edge subcarrier.Here each base station bit diagram of sending comprises the edge number of subcarriers of the quantity of " effectively " position for this base station.
Above-mentionedly be concrete realization of the present invention.Through the disturbance restraining method of the invention described above, based on the RNTP technology, dynamically carry out frequency planning, greatly reduce the interference of adjacent sub-district, improve user's transmission performance.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.

Claims (12)

  1. In the LTE system based on the disturbance restraining method of RNTP, it is characterized in that this method comprises:
    In cycle, each base station is at the s.t. ζ that satisfies condition at RNTP Ij=∈ 0,1};
    Figure FSA00000442091600011
    Figure FSA00000442091600012
    Situation under, in all subcarriers, select max{min (Г j') minimum X% subcarrier, as the edge subcarrier; Wherein, Г j' be the channel capacity value of distributing on the single sub-carrier that is scheduled, X% is preset edge subcarrier ratio;
    Each base station is through said each the base station selected edge subcarrier that goes out of its adjacent base station of RNTP signaling forbidding, carrying out the user when dispatching, and said each base station the user that current Signal to Interference plus Noise Ratio is the poorest be dispatched on the edge subcarrier of self selecting successively.
  2. 2. method according to claim 1 is characterized in that, the said max{min (Г that in all subcarriers, selects j') minimum X% subcarrier is:
    Be user's fixed allocation sub-carrier resources, the channel capacity value of each the number of sub-carrier j that confirms to be scheduled
    Figure FSA00000442091600013
    Wherein,
    Figure FSA00000442091600014
    P JiFor resource j distributes to the power of user i, g IjBe the product of path loss and subcarrier gains, I IjThe interference value that on j carrier resource, receives for user i;
    In the channel capacity value that calculates, select minimum X% subcarrier, as the edge subcarrier.
  3. 3. method according to claim 2 is characterized in that, saidly for user's fixed allocation sub-carrier resources is: according to the direct ratio fair algorithm is user's allocation of subcarriers resource;
    The channel capacity value of said each number of sub-carrier is:
    Figure FSA00000442091600015
    Wherein, β is the equitable proportion factor, I jIt is the suffered interference of j number of sub-carrier.
  4. 4. method according to claim 1 is characterized in that, the user that current Signal to Interference plus Noise Ratio is the poorest is dispatched to successively on the edge subcarrier of self selecting and is in said each base station:
    According to scheduling of the user in the current TTI and subcarrier allocation, calculate each user's Signal to Interference plus Noise Ratio, 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 the ordering is dispatched on the edge subcarrier successively, the resource allocation of subcarrier finishes up to the edge.
  5. 5. method according to claim 4; It is characterized in that; When selecting the edge subcarrier, be assigned to the user that is dispatched to after the said ordering in user and the current TTI on the edge subcarrier on the edge subcarrier not simultaneously; This method further comprises: carry out secondary distribution, be assigned to user on the edge subcarrier when selecting the edge subcarrier and be dispatched to and be dispatched to after the said ordering in the current TTI on the subcarrier that the user on the edge subcarrier is assigned with in this TTI.
  6. 6. method according to claim 1 is characterized in that, said each base station through said each the base station selected edge subcarrier that goes out of its adjacent base station of RNTP signaling forbidding is:
    Said RNTP signaling comprises the bit diagram that is mapped on each PRB; For the edge subcarrier of said each base station, the bit value of the corresponding PRB of this subcarrier is set to effectively, and it is invalid that the bit value of the corresponding PRB of all the other subcarriers is set to;
    Said adjacent base station receives said RNTP signaling, and wherein the bit value transmitting power that is set to the corresponding subcarrier of effective PRB is set to 0, and bit value is set to the corresponding subcarrier of invalid PRB and normally sends.
  7. 7. according to arbitrary described method in the claim 1 to 6, it is characterized in that this method further comprises: for any two adjacent base stations, it is dominant base that one of them base station is set, and another base station is the prothetic group station;
    When the subcarrier that receives forbidding in said notice and this notice of dominant base when the prothetic group station was the edge subcarrier at said prothetic group station, said prothetic group station this edge subcarrier of forbidding was not dispatched to the user on this edge subcarrier;
    When the subcarrier that receives forbidding in said notice and this notice at prothetic group station when dominant base was the edge subcarrier of said dominant base, said dominant base was not forbidden this edge subcarrier, and the user is dispatched on this edge subcarrier.
  8. 8. method according to claim 7 is characterized in that, in the beginning in each RNTP cycle, said dominant base and prothetic group station exchange.
  9. 9. method according to claim 7 is characterized in that, this method further comprises: said prothetic group stands in when sending the RNTP signaling, will other subcarriers except that the edge subcarrier in max{min (Г j') minimum Y% subcarrier is as the forbidding subcarrier, notifies said dominant base;
    Said dominant base is behind the subcarrier of confirming forbidding, if the subcarrier of the forbidding of determining, is then selected the subcarrier forbidding of X% at random greater than X%.
  10. 10. method according to claim 9 is characterized in that X=Y=30.
  11. 11. according to arbitrary described method in the claim 1 to 6; It is characterized in that; This method further comprises: for any two adjacent base stations; When the subcarrier that receives forbidding in said notice and this notice of another base station when one of them base station was the edge subcarrier of said one of them base station, this edge subcarrier was not forbidden in said one of them base station, and the user is dispatched on this edge subcarrier.
  12. 12. method according to claim 11 is characterized in that, X=30.
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