CN102740358B - Method and system for downlink inter-cell interference coordination - Google Patents

Abstract

The invention provides a method and a system for downlink inter-cell interference coordination. The method comprises the following steps: a first cell compiles statistics on its edge performance index, wherein a second sell and the first cell are adjacent cells; the first cell sends its tolerable RNTP threshold to the second cell when the edge performance index of the first cell does not or is enough to meet a predetermined requirement of the first cell, wherein the edge performance index includes the number of UE of which the edge can not meet quality of service (QOS) parameters or the number of UE of which a radio link fails or the throughput of the edge; and the second cell adjusts its RNTP value according to the received tolerable RNTP threshold. With the method adopted, accuracy of RNTP instructions can be improved, workload of OAM can be reduced, and execution efficiency can be improved.

Description

Downlink inter-cell interference coordination method and system

Technical field

The present invention relates to the communications field, in particular to a kind of downlink inter-cell interference coordination method and system.

Background technology

LTE system have employed OFDM (Orthogonal Frequency Division Multiplexing, OFDM) technology, overcome the interference in community well, but the interference between the network small area of a multiple cell still exists, and have a strong impact on the performance of whole network, particularly when the user UE being positioned at cell edge uses identical time/frequency source block (Resource Block simultaneously, RB) time, Signal to Interference plus Noise Ratio (Signal to Interference and Noise Ratio on these RB, SINR) can sharply decline, thus cause the poor utilization of resources and performance.

In order to solve the problem, 3GPP proposes multiple solution, wherein Inter-Cell Interference Coordination (Inter-CellInterference Coordination, ICIC) be the hot technology studied at present, it realizes simple, the business of various bandwidth can be applied to, and have good effect for AF panel.The general principle of Inter-Cell Interference Coordination is all arrange certain restriction to downlink or uplink resource (frequency band or power) management, to coordinate the action of each community, avoids producing serious presence of intercell interference.And each manufacturer to propose maximum be adopt partial frequency multiplexing (Fractional Frequency Reuse, or soft-frequency reuse (Soft Frequency Reuse FFR), SFR), namely cell edge can only use a part for whole available frequency band, and the frequency that edge, neighbor cell uses will stagger, the frequency range that cell edge uses sends with high power, and Intra-cell can use whole frequency range, if Intra-cell uses edge, neighbor cell frequency range to need low-power to send.On the basis of this scheme, again can according to the spendable frequency band in edge, minizone whether dynamic adjustment be divided into static state, semi-static and dynamic 3 kinds of modes.

Semi-static and dynamic ICIC is needed to the support of signaling between the eNB of community, X2 interface mutual LOAD INFORMATION message is defined in current 3GPP agreement, one of its cell carried Relative Narrowband TX Power (RelativeNarrowband TX Power, RNTP) power information on the service condition of this cell downlink Physical Resource Block PRB (PhysicalResource Block, PRB) and each PRB is indicated to adjacent cell.If specify that in 36.423 and 36.213 agreements the maximum transmission power on certain PRB within certain time period in the future may higher than RNTP thresholding, then the bit diagram bitmap instruction on this PRB is just 1, otherwise is 0.ICIC operation is carried out by the transmitting power of maximum permission on dynamic conditioning RNTP thresholding and each PRB in minizone, refers to Fig. 1, and when eNB0 is UE service, eNB1, eNB2, eNB3 are in not corresponding generation interference in the same time:

Step S101, UE report adjacent cell list (eNB0,1,2), and eNB0 finds that the performance index at oneself edge do not meet the requirement of this community;

Step S102, eNB0 send LOAD INFORMATION to eNB1, and RNTP cell wherein comprises RNTPbitmap, RNTP Threshold;

Step S103, eNB0 send LOAD INFORMATION to eNB2, and RNTP cell wherein comprises RNTPbitmap, RNTP Threshold;

The power that step S104, eNB1, eNB2 reduce RNTP thresholding and be designated as on the PRB of 0;

Step S105, UE report adjacent cell list (eNB0,2,3), and eNB0 finds that the edge performance index of oneself enough meets the requirement of this community;

Step S106, eNB0 send to OAM and improve the request of RNTP thresholding;

Step S107, eNB2 find that the edge performance index of oneself has enough met the requirement of this community to the request of OAM transmission raising RNTP thresholding;

Step S108, eNB3 find that the edge performance index of oneself has enough met the requirement of this community to the request of OAM transmission raising RNTP thresholding;

Step S109, OAM find that its adjacent cell is all improved the request of RNTP thresholding;

Step S110, OAM notify that eNB0 improves RNTP thresholding;

The power that step S111, eNB0 improve RNTP thresholding and be designated as on the PRB of 0.

The eNB receiving this instruction can dispatch with reference to these information, and verifies the validity of the RNTP instruction received.Because the scheduling strategy of each equipment vendors is different, so the embody rule of this cell does not specify in the 3 gpp standards, but the basic principle of carrying out interference coordination after scheduler gets these information is very clear and definite, in order to avoid interference, the PRB that adjacent cell RNTPbitmap is designated as 1 distributes to the user of this center of housing estate, and the user that the PRB that RNTP bitmap is designated as 0 can distribute to this cell edge also can use to central user.

Therefore correlation technique can utilize RNTP instruction to carry out interference coordination, premised on less to the interference of this Cell Edge User when supposing that adjacent cell RNTP bitmap is designated as 0, and the calculating of RNTP bitmap calculates according to parameter RNTP value Threshold, do like this in the rational situation of RNTP Threshold and effectively can suppress interference, at LTE network initial operating stage, RNTP Threshold can according to standardized of whole network condition, cell load, UE distribution in the cell, community wireless environment and system bandwidth isotactic reasonably value.

But along with the operation of network, the load of each community, the distribution of UE may change, this just needs each community to reset the RNTP Threshold of oneself, namely each community can complete the self-optimizing of ICIC by dynamic conditioning RNTP Threshold, but with the setting of the RNTP Threshold in current agreement just from each factor in this community, the current degree can standing interference of adjacent cell can not be known, the i.e. load of adjacent cell, UE distribution situation etc. determines a suitable RNTP Threshold, if this parameter is unreasonable through checking, even if namely RNTP bitmap instruction be 0 PRB on also power capability is very large, to adjacent cell serious interference, so tell the RNTP of adjacent cell to indicate by X2 interface and will there is no reference significance, do not have the effect of Inter-Cell Interference Coordination.

Only support that community reduces power with the RNTP cell of current 3GPP standard definition, namely when community finds the thresholding of the RNTP Threshold of oneself higher than adjacent cell, just aware the interference of adjacent cell large, so reduction power, reducing power and only have wholesome effect to adjacent cell, is therefore to make decision with regard to a community; If but increased wattage, impact is had on all adjacent cells, can not increase without authorization with regard to a community, therefore object management architecture (ObjectManagement Architecture is also needed, OAM) finally determine according to network condition, this will go wrong: eNB constantly will transmit data with OAM, can increase the workload of background data base like this, and affect execution efficiency.

Setting for the RNTP Threshold in agreement current in correlation technique is from each factor in this community, the current degree can standing interference of adjacent cell can not be known, the i.e. load of adjacent cell, UE distribution situations etc. are come, if this parameter is unreasonable through checking, even if namely RNTP bitmap instruction be 0 PRB on also power capability is very large, to adjacent cell serious interference, tell the RNTP of adjacent cell to indicate by X2 interface and will there is no reference significance, do not have the problem of the effect of Inter-Cell Interference Coordination, if and but increased wattage, impact is had on all adjacent cells, OAM is needed finally to determine according to network condition, eNB constantly will transmit data with OAM, the workload of background data base can be increased like this, and affect the problem of execution efficiency, at present effective solution is not yet proposed.

Mention in correlation technique, along with the operation of network, the load of each community, the distribution of UE may change, this just needs each community to reset the RNTP Threshold of oneself, namely each community can complete the self-optimizing of ICIC by dynamic conditioning RNTPThreshold, but with the setting of the RNTP Threshold in current agreement just from each factor in this community, the current degree can standing interference of adjacent cell can not be known, the i.e. load of adjacent cell, UE distribution situation etc. determines a suitable RNTP Threshold, if this parameter is unreasonable through checking, even if namely RNTP bitmap instruction be 0 PRB on also power capability is very large, to adjacent cell serious interference, so tell the RNTP of adjacent cell to indicate by X2 interface and will there is no reference significance, do not have the effect of Inter-Cell Interference Coordination.

Only support that community reduces power with the RNTP cell of current 3GPP standard definition, namely when community finds the thresholding of the RNTP Threshold of oneself higher than adjacent cell, just aware the interference of adjacent cell large, so reduction power, reducing power and only have wholesome effect to adjacent cell, is therefore to make decision with regard to a community; If but increased wattage, impact is had on all adjacent cells, can not increase without authorization with regard to a community, therefore OAM is also needed finally to determine according to network condition, this will go wrong: eNB constantly will transmit data with OAM, the workload of background data base can be increased like this, and affect execution efficiency.

For solving the problems of the technologies described above, embodiments provide a kind of downlink inter-cell interference coordination method, its handling process as shown in Figure 2, comprising:

The edge performance index of step S202, the first Cell statistical first community;

Step S204, when the edge performance index of the first community does not meet the preset requirement of the first community or enough meets the preset requirement of the first community, first community sends the tolerable RNTP thresholding of the first community to the second community, edge performance index comprises edge cannot meet the number of the user UE of QoS parameter QOS or the number of Radio Link Failure UE or the throughput at edge, the second community and the first community adjacent cell each other;

Step S206, the second community are according to the RNTP value of the tolerable RNTP thresholding adjustment received self.

In embodiments of the present invention, the edge performance index of first this community of Cell statistical, when the edge performance index of the first community can not meet or enough meet the preset requirement of the first community, first community sends the tolerable RNTP thresholding of the first community to the second community as adjacent cell, the second community is according to the RNTP value of the tolerable RNTP thresholding adjustment received self.Adopt method provided by the invention, second community is according to the RNTP value of the tolerable RNTP thresholding adjustment received self, and then can indicate by corresponding adjustment RNTP bitmap, make to indicate the impact considering adjacent cell factor, ensure its accuracy, avoid occurring that but RNTP bitmap is 0 disturbs UE very large, or RNTP bitmap is 1 but very little to UE interference situation, thus adapts to network load dynamic change.Further, the second community according to the RNTP value of the tolerable RNTP thresholding adjustment received self, can not need to carry out data interaction with OAM, reduces the workload of background data base, improve execution efficiency.

During enforcement, second community is according to the RNTP value of the tolerable RNTP thresholding adjustment received self, in the application, second community can receive the tolerable RNTP thresholding of the first community transmission (also referred to as RNTP Threshold Tolerable, be used to indicate the maximum RNTP value that this community can be tolerated, preferably, position parallel with RNTP Threshold in " Relative Narrowband Tx Power (RNTP) " cell in X2 mouth LOAD INFORMATION message newly can be added an optional attribute, ordered as RNTP Threshold Tolerable), also the tolerable RNTP thresholding that other adjacent cells send can be accepted, when the second community receives the tolerable RNTP thresholding of multiple adjacent cell transmission simultaneously,

During the RNTP value of tolerable RNTP thresholding lower than the second community that at least one adjacent cell sends if exist in other adjacent cells, the second community is according to this tolerable RNTP thresholding reduction RNTP value;

If the tolerable RNTP thresholding that other adjacent cells send is all higher than the second community, during RNTP value, the second community is according to the tolerable RNTP thresholding raising RNTP value received.

In one embodiment, the second community, can also according to the power on the tolerable RNTP thresholding adjustment restricted physical resources block PRB received according to after the RNTP value of the tolerable RNTP thresholding adjustment received self.Accordingly, during the RNTP value of tolerable RNTP thresholding lower than the second community that at least one adjacent cell sends if exist in other adjacent cells, the second community reduces the power on limited PRB according to this RNTP thresholding; If during the RNTP value of tolerable RNTP thresholding all higher than the second community that other adjacent cells send, the power on limited PRB is improved in the second community according to the tolerable RNTP thresholding of reception.

Before first community sends the tolerable RNTP thresholding of the first community to the second community, preferably, the first community calculates the tolerable RNTP thresholding of the first community as follows:

Calculate the PRB shared by first guarantee edge, community all user UE QoS parameter QOS;

Get all edge UE to take on PRB minimum transmitting power on category-A symbol RE and be normalized (such as, can be normalized according to the method for normalizing of 5.2.1 joint regulation in 36.213 agreements) according to average power;

Normalized value is rounded to the tolerable RNTP thresholding of acquisition first community downwards.

From the angle of procedure, the method that the embodiment of the present invention provides is set forth:

As shown in Figure 3, by the RNTP cell in X2 mouth LOAD INFORMATION message, the position parallel with RNTP Threshold newly adds an optional attribute " RNTP Threshold Tolerable ", be used to refer to the maximum RNTP thresholding that this community can be tolerated, when a community finds that the edge performance index of oneself does not meet this community and requires (namely, edge performance index does not meet the preset requirement of the first community or enough meets the preset requirement of the first community) time, then send oneself tolerable RNTP thresholding " RNTP Threshold Tolerable " to this adjacent area, otherwise do not send, the community receiving this new attribute will adjust the transmitting power of the maximum permission on oneself RNTP Threshold and limited PRB, so just can solve the problem of RNTPbitmap misregister.

During " the RNTP Threshold Tolerable " that have adjacent cell to send when a community " RNTPThreshold " lower than this community, this community will reduce oneself using " RNTP Threshold " and limited PRB on the transmitting power of maximum permission.

As " RNTP Threshold Tolerable " that all adjacent cells of a community send " RNTPThreshold " all higher than this community, the transmitting power of the maximum permission on oneself " RNTP Threshold " and limited PRB just can be improved in this community.Therefore just need not determine to increase the power on limited PRB by OAM by increasing eNB after this attribute, operating rear eNB so just can power completely on oneself Control constraints PRB.

When eNB0 is UE service, the corresponding generation interference of eNB1, eNB2, eNB3, no longer need OAM in this example, shown in Fig. 3, flow process is specific as follows:

Step S301, UE report adjacent cell list (eNB0,1,2), and eNB0 finds that the edge performance index of oneself can not meet the requirement of this community;

Step S302, eNB0 send LOAD INFORMATION to eNB1, and RNTP cell wherein comprises RNTPbitmap, RNTP Threshold and tolerable RNTP thresholding (RNTP Threshold Tolerable);

Step S303, eNB0 send LOAD INFORMATION to eNB2, and RNTP cell wherein comprises RNTPbitmap, RNTP Threshold and tolerable RNTP thresholding (RNTP Threshold Tolerable);

The power that step S304, eNB1, eNB2 reduce RNTP thresholding and be designated as on the PRB of 0;

Step S305, UE report adjacent cell list (eNB0,2,3), and eNB0 finds that the edge performance index of oneself can meet the requirement of this community;

Step S306, eNB2 send LOAD INFORMATION to eNB0, and RNTP cell wherein comprises RNTPbitmap, RNTP Threshold) and tolerable RNTP thresholding (RNTP Threshold Tolerable);

Step S307, eNB3 send LOAD INFORMATION to eNB0, and RNTP cell wherein comprises RNTPbitmap, RNTP Threshold and tolerable RNTP thresholding (RNTP Threshold Tolerable);

The power that step S308, eNB0 improve RNTP thresholding and be designated as on the PRB of 0.

The self-optimizing flow chart carrying out ICIC after adding attribute " RNTP Threshold Tolerable " refers to accompanying drawing 4:

Step S401, each community safeguard an adjacent cell table list separately, comprise No. ID and RNTP thresholding of adjacent cell;

Step S402, statistics T _periodthe adjacent cell that the number Num of the problematic UE in time Nei Zhe community and these UE reports;

Step S403, to judge whether Num is not less than threshold T rdNum or Num be 0, if so, then performs step S404, if not, then performs step S402;

Step S404, calculate RNTP Threshold Tolerable according to cell load and UE distribution;

Step S405, notify the RNTP Threshold Tolerable that all adjacent cells are new;

After step S406, adjacent cell receive, upgrade adjacent cell list, and extract the minimum M inTrd of all RNTP ThresholdTolerable received;

Step S407, adjacent cell judge whether RNTP thresholding is greater than MinTrd, if so, perform step S408, if not, perform step S410;

It is MinTrd that step S408, adjacent cell reduce oneself RNTP thresholding, and reduce RNTP bitmap be 0 PRB on power;

Step S409, adjacent cell notify the RNTP thresholding MinTrd that all adjacent cells are new, not containing the RNTP ThresholdTolerable of self, and return execution step S402;

Step S410, adjacent cell judge whether RNTP thresholding is less than MinTrd, if so, perform step S411, if not, perform step S414;

Step S411, adjacent cell judge whether that all adjacent cells have the RNTP Threshold Tolerable of request, if so, then perform step S412, if not, then perform step S414;

It is MinTrd that step S412, adjacent cell improve oneself RNTP thresholding, and improve RNT bitmap be 0 PRB on power;

Step S413, adjacent cell notify the RNTP thresholding MinTrd that all adjacent cells are new, not containing the RNTP ThresholdTolerable of self;

Step S414, adjacent cell do not carry out any operation.

Summary of the invention

The present invention aims to provide a kind of downlink inter-cell interference coordination method and system, to solve the setting of the RNTP Threshold in agreement current in correlation technique just from each factor in this community, the current degree can standing interference of adjacent cell can not be known, the i.e. load of adjacent cell, the impact of the factors such as UE distribution situation, if this parameter is unreasonable through checking, even if namely RNTPbitmap instruction be 0 PRB on also power capability is very large, to adjacent cell serious interference, tell the RNTP of adjacent cell to indicate by X2 interface and will there is no reference significance, do not have the problem of the effect of Inter-Cell Interference Coordination, if and but increased wattage, impact is had on all adjacent cells, OAM is needed finally to determine according to network condition, eNB constantly will transmit data with OAM, the workload of background data base can be increased like this, and affect the problem of execution efficiency.

According to an aspect of the present invention, provide a kind of downlink inter-cell interference coordination method, comprising: the edge performance index of the first community described in the first Cell statistical, described second community and described first community adjacent cell each other; When the edge performance index of described first community does not meet the preset requirement of described first community or enough meets the preset requirement of described first community, described first community sends the tolerable RNTP thresholding of described first community to described second community, and described edge performance index comprises edge cannot meet the number of the UE of QoS parameter QOS or the number of Radio Link Failure UE or the throughput at edge; Described second community is according to the RNTP value of the tolerable RNTP thresholding adjustment received self.

Preferably, described second community is according to the RNTP value of the tolerable RNTP thresholding adjustment received self, comprise: when described second community receives the tolerable RNTP thresholding of multiple adjacent cell transmission simultaneously, during the RNTP value of tolerable RNTP thresholding lower than described second community that at least one adjacent cell sends if exist in other adjacent cells described, described second community reduces described RNTP value according to this tolerable RNTP thresholding; If during the RNTP value of the tolerable RNTP thresholding that described other adjacent cells send all higher than described second community, described RNTP value is improved according to the tolerable RNTP thresholding of reception in described second community.

Preferably, described second community, according to after the RNTP value of the tolerable RNTP thresholding adjustment received self, also comprises: described second community is according to the power on the tolerable RNTP thresholding adjustment restricted physical resources block PRB received.

Preferably, described second community adjusts the power on limited PRB according to the tolerable RNTP thresholding received, comprise: during the RNTP value of tolerable RNTP thresholding lower than described second community that at least one adjacent cell sends if exist in other adjacent cells described, described second community is according to the power on the described limited PRB of this tolerable RNTP thresholding reduction; If during the RNTP value of the tolerable RNTP thresholding that described other adjacent cells send all higher than described second community, described second community is according to the power on the described limited PRB of tolerable RNTP thresholding raising received.

Preferably, described first community also comprises: described first community calculates the tolerable RNTP thresholding of described first community as follows: calculate the PRB shared by described first guarantee edge, community all user UE QoS parameter QOS before sending the tolerable RNTP thresholding of described first community to described second community; Get all edge UE to take on PRB minimum transmitting power in category-A sign resources elements RE and be normalized according to average power; Normalized value is rounded to the tolerable RNTP thresholding obtaining described first community downwards.

Preferably, described first community sends the tolerable RNTP thresholding of described first community to described second community, comprise: described first community utilizes X2 interface mutual LOAD INFORMATION message to send the tolerable RNTP thresholding of described first community, wherein, in described LOAD INFORMATION message, the tolerable RNTP thresholding attribute of described first community and the position of RNTP value attribute walk abreast.

According to a further aspect in the invention, provide a kind of descending Inter-Cell Interference Coordination system, at least comprise the first community and second community of adjacent cell each other: described first community, for adding up the edge performance index of described first community; When the edge performance index of described first community does not meet the preset requirement of described first community or enough meets the preset requirement of described first community, described first community sends the tolerable RNTP thresholding of described first community to described second community, and described edge performance index comprises edge cannot meet the number of the user U E of QoS parameter QOS or the number of Radio Link Failure U E or the throughput at edge; Described second community, for the RNTP value according to the tolerable RNTP thresholding adjustment received self.

Preferably, described second community also for receive when described second community simultaneously other adjacent cells multiple send tolerable RNTP thresholding time, during the RNTP value of tolerable RNTP thresholding lower than described second community that at least one adjacent cell sends if exist in other adjacent cells described, reduce described RNTP value according to this tolerable RNTP thresholding; If during the RNTP value of the tolerable RNTP thresholding that described other adjacent cells send all higher than described second community, the tolerable RNTP thresholding according to reception improves described RNTP value.

Preferably, described second community is also for adjusting the power on restricted physical resources block PRB according to the tolerable RNTP thresholding received.

Preferably, if described second community is also for existing the RNTP value of tolerable RNTP thresholding lower than described second community that at least one adjacent cell sends in other adjacent cells described time, according to the power on the described limited PRB of this tolerable RNTP thresholding reduction; If during the RNTP value of the tolerable RNTP thresholding that described other adjacent cells send all higher than described second community, according to the power on the described limited PRB of tolerable RNTP thresholding raising received.

Preferably, described first community is also for calculating the tolerable RNTP thresholding of described first community as follows: calculate the PRB shared by first guarantee edge, community all user UE QoS parameter QOS; Get all edge UE to take on PRB minimum transmitting power on category-A symbol RE and be normalized; Normalized value is rounded up and obtains the tolerable RNTP thresholding of described first community.

In embodiments of the present invention, the edge performance index of first this community of Cell statistical, when the edge performance index of the first community can not meet or enough meet the preset requirement of the first community, first community sends the tolerable RNTP thresholding of the first community to the second community as adjacent cell, the second community is according to the RNTP value of the tolerable RNTP thresholding adjustment received self.Adopt method provided by the invention, second community is according to the RNTP value of the tolerable RNTP thresholding adjustment received self, and then can indicate by corresponding adjustment RNTP bitmap, make to indicate the impact considering adjacent cell factor, ensure its accuracy, avoid occurring that but RNTP bitmap is 0 disturbs UE very large, or RNTP bitmap is 1 but very little to UE interference situation, thus adapts to network load dynamic change.Further, the second community according to the RNTP value of the tolerable RNTP thresholding adjustment received self, can not need to carry out data interaction with OAM, reduces the workload of background data base, improve execution efficiency.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 carries out the self-optimizing signaling process figure of ICIC according to the existing protocol support that utilizes of correlation technique;

Fig. 2 is the structured flowchart of the downlink inter-cell interference coordination method according to the embodiment of the present invention;

Fig. 3 is the self-optimizing signaling process figure carrying out ICIC after the interpolation attribute " RNTP Threshold Tolerable " according to the embodiment of the present invention;

Fig. 4 is the self-optimizing process chart carrying out ICIC after the interpolation attribute " RNTP Threshold Tolerable " according to the embodiment of the present invention;

When Fig. 5 is two neighboring BS relationship according to the embodiment of the present invention, folk prescription proposes " RNTP Threshold Tolerable " and fills in exemplary plot;

When Fig. 6 is two neighboring BS relationship according to the embodiment of the present invention, both sides propose " RNTP Threshold Tolerable " and fill in exemplary plot;

When Fig. 7 is the multiple neighboring BS relationship according to the embodiment of the present invention, both sides propose " RNTP Threshold Tolerable " and fill in exemplary plot;

Fig. 8 is the structural representation of the descending Inter-Cell Interference Coordination according to the embodiment of the present invention.

Embodiment

Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.

Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.

Embodiment 1:

Below first for 2 eNB, the enforcement of technical scheme is described in further detail.Wherein eNB1 and eNB2 adjacent cell each other, eNB1 is only had to propose adjacent cell interference excessive or too small, and suppose Value2 > Value1, to how filling in " RNTP Threshold Tolerable " in LOADINFORMATION message being described in detail, seeing accompanying drawing 5.

Step S501, eNB1, eNB2 understand the list of the RNTP Threshold Tolerable that can tolerate that maintenance adjacent cell ID is corresponding with each adjacent cell separately, and initial adjacent cell ID and RNTP Threshold Tolerable is sky;

That step S502, eNB1 add up this cell serves and cover problematic UE, comprise QOS cannot meet and the UE of Radio Link Failure, be assumed to be Num1, and add up the adjacent cell list that these UE report, eNB1 can extract the strongest adjacent cell according to each UE, if there is multiple problematic UE, just each UE extracts, each UE extracts at most 2, is then placed in adjacent cell ID; Suppose that after extracting, the strongest adjacent cell of eNB1 is eNB2, owing to also not receiving " RNTP Threshold Tolerable " that adjacent cell sends, therefore, it is possible to the RNTP Threshold Tolerable of tolerance is still empty;

Step S503, when Num1 is more than a threshold T rdNum, eNB1 according to oneself cell load, UE distribution calculate a patient threshold value " RNTP Threshold Tolerable "; Wherein, patient threshold value " RNTPThreshold Tolerable " computational methods:

PRB shared during first calculation plot guarantee edge all UE QOS;

Get all edge UE and take transmitting power minimum on category-A symbol RE on PRB, according to being normalized again of 5.2.1 joint regulation in 36.213 agreements;

Normalized value is rounded downwards and is RNTP Threshold Tolerable;

Step S503, suppose that RNTP Threshold Tolerable is Value1, eNB1 and sends LOADINFORMATION message by X2 to eNB2;

After step S504, eNB2 receive LOAD INFORMATION message, upgrade adjacent cell list, that eNB2 is { [eNB1, Value1] }, and judges that whether " the RNTP Threshold " that oneself using be higher than " the RNTPThreshold Tolerable " in message

If be less than, then

Improving oneself RNTP thresholding is Value1, and corresponding adjustment RNTP bitmap is designated as the transmitting power on the PRB of " 0 ";

LOAD INFORMATION message is sent to eNB1 ", tell " RNTP Threshold " that it is new, now do not fill in this message " RNTP Threshold Tolerable ";

If equaled, do not take any operation;

Here suppose eNB2 higher than, illustrate that oneself is large to eNB1 interference, then

Step S505, eNB2 need " the RNTP Threshold " that reset oneself according to " the RNTP Threshold Tolerable " in adjacent cell list, here Value1 will be set to, and corresponding adjustment RNTP bitmap is designated as the transmitting power on the PRB of " 0 ";

Step S506, eNB2 send LOAD INFORMATION message to eNB1, tell " RNTPThreshold " that they are new, now do not fill in this message " RNTP Threshold Tolerable ";

Step S507, eNB1 wait for the LOAD INFORMATION message of eNB2, receive rear continue this cell serves of statistics and cover problematic UE and cell load;

Step S508, eNB1 find not have the UE of covering problem, then recalculate a patient RNTP thresholding according to the distribution of UE and cell load;

Step S509, eNB1 send LOAD INFORMATION message by X2 to eNB2, tell that the tolerable interference of adjacent cell oneself can also be larger again, the new threshold value " RNTP Threshold Tolerable " calculated to be filled in message, be assumed to be Value2;

After step S510, eNB2 receive LOAD INFORMATION message, upgrade the adjacent cell list of oneself for { [eNB1, Value2] }, then perform following operation:

ENB2 compares the value of RNTP Threshold Tolerable in its RNTP Threshold used and adjacent cell list, and the RNTP Threshold used is Value1, Value1 < Value2;

The RNTP Threshold that eNB2 is using oneself is set to Value2, and corresponding adjustment RNTP bitmap is designated as the transmitting power on the PRB of " 0 ";

Step S511, eNB2 send LOAD INFORMATION message to eNB1 ", tell " RNTPThreshold " that it is new, now do not fill in this message " RNTP Threshold Tolerable ".

Embodiment 2:

Below first for 2 eNB, the enforcement of technical scheme is described in further detail.Wherein eNB1 and eNB2 adjacent cell each other, it is excessive or too small that eNB1 and eNB2 all proposes adjacent cell interference, and suppose Value3 > Value2 > Value1, to how filling in " RNTP Threshold Tolerable " in LOAD INFORMATION message being described in detail, seeing accompanying drawing 6.

Step S601, eNB1, eNB2 understand the list of the RNTP Threshold Tolerable that can tolerate that maintenance adjacent cell ID is corresponding with each adjacent cell separately, and initial adjacent cell ID and RNTP Threshold Tolerable is sky;

That step S602, eNB1 add up this cell serves and cover problematic UE, be assumed to be Num1, and add up the adjacent cell list that these UE report, eNB1 extracts 2 adjacent cells the strongest according to each UE, if there is multiple problematic UE, extract with regard to each UE, each UE extracts at most 2, is then placed in adjacent cell ID; Suppose that after extracting, the strongest adjacent cell of eNB1 is eNB2, owing to also not receiving " RNTP Threshold Tolerable " that adjacent cell sends, therefore, it is possible to the RNTP Threshold Tolerable of tolerance is still empty;

Step S603, when Num1 is more than a threshold T rdNum1, eNB1 according to oneself cell load, UE distribution calculate a patient threshold value " RNTP Threshold Tolerable ";

Step S604, eNB1 are assumed to be RNTP Threshold Tolerable Value1, and send LOAD INFORMATION message by X2 to eNB2;

After step S605, eNB2 receive LOAD INFORMATION message, upgrading adjacent cell list is { [eNB1, Value1] }, and judges that whether " the RNTP Threshold " that oneself using be higher than " the RNTP ThresholdTolerable " in message

If be less than, then

Improving oneself RNTP thresholding is Value1, and corresponding adjustment RNTP bitmap is designated as the transmitting power on the PRB of " 0 ";

Send LOAD INFORMATION message to eNB1, tell " RNTP Threshold " that it is new, now do not fill in this message " RNTP Threshold Tolerable ";

If equaled, do not take any operation;

Here suppose eNB2 higher than, illustrate that oneself is large to eNB1 interference, then

ENB2 needs " RNTPThreshold " that to reset oneself according to " the RNTP Threshold Tolerable " in adjacent cell list, will be set to Value1 here, and reduces RNTP bitmap and be designated as transmitting power on the PRB of " 0 ";

Step S606, eNB2 send LOAD INFORMATION message to eNB1, tell " RNTPThreshold " that they are new, now do not fill in this message " RNTP Threshold Tolerable ";

Step S607, eNB1 receive the LOAD INFORMATION message of eNB2, continue statistics this cell serves and cover problematic UE and cell load;

That step S608, eNB2 add up this cell serves and cover problematic UE and cell load, when finding that there is problem UE number Num2;

Step S609, when Num2 exceedes thresholding TrdNum2, eNB2 according to oneself cell load, UE distribution calculate a patient threshold value " RNTP Threshold Tolerable ", be assumed to be Value2;

Step S610, eNB2 send LOAD INFORMATION message by X2 to eNB1;

After step S611, eNB1 receive LOAD INFORMATION message, upgrading adjacent cell list is { [eNB2, Value2] }, and " RNTP Threshold " that oneself is being used is set to Value2;

Step S612, eNB1 send LOAD INFORMATION message to eNB2, tell " RNTPThreshold " that they are new, now do not fill in this message " RNTP Threshold Tolerable ";

Step S613, eNB2 receive the LOAD INFORMATION message of eNB1, continue statistics this cell serves and cover problematic UE;

Step S614, eNB2 find not have the UE of covering problem, then calculate a patient RNTP thresholding according to the distribution of this community UE and cell load;

It is Value3 that step S615, eNB2 are assumed to be patient RNTP thresholding, and sends LOADINFORMATION message by X2 to eNB1;

After step S616, eNB1 receive LOAD INFORMATION message, upgrading adjacent cell list is { [eNB2, Value3] }, and " RNTP Threshold " that oneself is being used is set to Value3;

Step S617, eNB1 send LOAD INFORMATION message to eNB2, tell " RNTPThreshold " that they are new, now do not fill in this message " RNTP Threshold Tolerable ".

Embodiment 3:

Below for 4 eNB, the enforcement of technical scheme is described in further detail.Wherein the adjacent cell of eNB0 is eNB1 and eNB2, eNB1 adjacent cell only has eNB0, the adjacent cell of eNB2 is eNB0 and eNB3, and hypothesis Value4 > Value3 > Value2 > Value1, serve as theme with eNB0 and eNB2 and to be described in detail to when filling in " RNTP Threshold Tolerable " in LOAD INFORMATION message, see accompanying drawing 7.

Step S701, eNB0, eNB1, eNB2, eNB3 understand the list of the RNTP Threshold Tolerable that can tolerate that maintenance adjacent cell ID is corresponding with each adjacent cell separately, and initial adjacent cell ID and RNTP ThresholdTolerable is sky;

That step S702, eNB0 add up this cell serves and cover problematic UE, be assumed to be Num1, and add up the adjacent cell list that these UE report, eNB0 can extract 2 adjacent cells the strongest according to each UE, if there is multiple problematic UE, extract 2 with regard to each UE, be then placed in adjacent cell ID; Suppose that after extracting, the strongest adjacent cell of eNB0 is eNB1 and eNB2, owing to also not receiving " RNTP Threshold Tolerable " that adjacent cell sends, the RNTP Threshold Tolerable that therefore each adjacent cell can be tolerated still is sky;

Step S703, when Num1 is more than a threshold T rdNum, eNB0 according to oneself cell load, UE distribution calculate patient threshold value " RNTP Threshold Tolerable ";

Step S704, eNB0 suppose that RNTP Threshold Tolerable is Value1, then send LOAD INFORMATION message by X2 respectively to eNB1 and eNB2, tell adjacent cell to disturb excessive;

After step S705, eNB1 and eNB2 receive LOAD INFORMATION message, upgrade adjacent cell list, eNB1 and eNB2 is { [eNB0, Value1] }, and judge whether " the RNTP Threshold " oneself used is greater than " RNTP Threshold Tolerable " in message, the RNTP Threshold that each eNB initially uses is the value of the network planning, then

Here suppose that eNB1 is less than, then

ENB1 checks whether the adjacent cell list of oneself has this request, and eNB1 only has eNB0 adjacent area, and therefore improving oneself RNTP thresholding is Value1, and corresponding adjustment RNTP bitmap is designated as the transmitting power on the PRB of " 0 ".

Step S706, eNB1 send LOAD INFORMATION message to eNB0 ", tell " RNTPThreshold " that it is new, now do not fill in this message " RNTP Threshold Tolerable ";

If equaled, do not take any operation;

Here suppose eNB2 higher than, illustrate that oneself is large to eNB0 interference; ENB2 also receives the LOADINFORMATION message of adjacent cell eNB3 simultaneously, and fill in message " the RNTP Threshold Tolerable " of eNB3, is assumed to be Value2, then

The adjacent cell list that eNB2 upgrades oneself is following two class values { [eNB0, Value1], [eNB3, Value2] };

ENB2 needs " the RNTP Threshold " that reset oneself according to " RNTP Threshold Tolerable " minimum in adjacent cell list, here Value1 will be set to, and corresponding adjustment RNTP bitmap is designated as the transmitting power on the PRB of " 0 ";

Step S707, eNB2 send LOAD INFORMATION message to eNB0 and eNB3, tell " RNTP Threshold " that they are new, now do not fill in this message " RNTP Threshold Tolerable ";

Step S708, eNB0 wait for the LOAD INFORMATION message of eNB1 and eNB2, receive rear continue this cell serves of statistics and cover problematic UE and cell load;

Step S709, eNB0 find not have the UE of covering problem, then recalculate a patient RNTP thresholding according to the distribution of UE and cell load;

Step S710, eNB0 send LOAD INFORMATION message by X2 respectively to eNB1 and eNB2, tell that the tolerable interference of adjacent cell oneself can also be larger again, the new threshold value " RNTP ThresholdTolerable " calculated to be filled in message, be assumed to be Value3;

After step S711, eNB1 receive LOAD INFORMATION message, upgrade the adjacent cell list of oneself, that eNB1 is { [eNB0, Value3] }, eNB2 also receives the LOAD INFORMATION message that adjacent cell is eNB3 simultaneously, and fill in message " the RNTP Threshold Tolerable " of eNB3, be assumed to be Value4, the adjacent cell list { [eNB0 of eNB2, Value3], [eNB3, Value4] }, then

For eNB1, the RNTP Threshold that it is using is Value1, Value1 < Value3;

The RNTP Threshold that eNB1 improves oneself is Value3, and corresponding adjustment RNTP bitmap is designated as the transmitting power on the PRB of " 0 ";

Step S712, eNB1 send LOAD INFORMATION message to eNB0 ", tell " RNTPThreshold " that it is new, now do not fill in this message " RNTP Threshold Tolerable ";

For eNB2, compare the minimum value of RNTP ThresholdTolerable in its RNTP Threshold used and all adjacent cell lists, the RNTP Threshold used is Value1, Value1 < Value3;

The RNTP Threshold that eNB2 is using oneself is set to Value3, and corresponding adjustment RNTP bitmap is designated as the transmitting power on the PRB of " 0 ";

Step S713, eNB2 send LOAD INFORMATION message to eNB0 and eNB3 ", tell " RNTPThreshold " that it is new, now do not fill in this message " RNTP Threshold Tolerable ".

Based on same inventive concept, the embodiment of the present invention additionally provides a kind of descending Inter-Cell Interference Coordination system, and its structural representation as shown in Figure 8, at least comprises the first community 801 and the second community 802 of adjacent cell each other:

First community 801, for adding up the edge performance index of the first community 801; When the edge performance index of the first community 801 does not meet the preset requirement of the first community 801 or enough meets the preset requirement of the first community 801, send the tolerable RNTP thresholding of the first community 801 to the second community 802, edge performance index comprises edge cannot meet the number of the user UE of QoS parameter QOS or the number of Radio Link Failure UE or the throughput at edge;

Second community 802, for the RNTP value according to the tolerable RNTP thresholding adjustment received self.

In one embodiment, second community 802 can also be used for when the second community 802 receives the RNTP thresholding of other adjacent cells multiple transmission simultaneously, during the RNTP value of RNTP thresholding lower than the second community 802 that at least one adjacent cell sends if exist in other adjacent cells, according to this RNTP thresholding reduction RNTP value; If during the RNTP value of RNTP thresholding all higher than the second community 802 that other adjacent cells send, according to this RNTP thresholding raising RNTP value.

In one embodiment, the second community 802 is also for adjusting the power on restricted physical resources block PRB according to the RNTP thresholding received.

In one embodiment, if the second community 802 is also for existing the RNTP value of RNTP thresholding lower than the second community 802 that at least one adjacent cell sends in other adjacent cells time, reduce the power on limited PRB according to this RNTP thresholding; If the RNTP thresholding that other adjacent cells send all higher than the second community 802, during RNTP value, improves the power on limited PRB according to this RNTP thresholding.

In one embodiment, the first community 801 is also for calculating the tolerable RNTP thresholding of the first community 801 as follows:

Calculate the PRB that the first community 801 ensures shared by edge all user UE QoS parameter QOS;

Get all edge UE to take on PRB minimum transmitting power on category-A symbol RE and be normalized;

Normalized value is rounded to the tolerable RNTP thresholding of acquisition first community 801 downwards.

As can be seen from the above description, present invention achieves following technique effect:

In embodiments of the present invention, the edge performance index of first this community of Cell statistical, when the edge performance index of the first community can not meet or enough meet the preset requirement of the first community, first community sends the tolerable RNTP thresholding of the first community to the second community as adjacent cell, the second community is according to the RNTP value of the tolerable RNTP thresholding adjustment received self.Adopt method provided by the invention, second community is according to the RNTP value of the tolerable RNTP thresholding adjustment received self, and then can indicate by corresponding adjustment RNTP bitmap, make to indicate the impact considering adjacent cell factor, ensure its accuracy, avoid occurring that but RNTP bitmap is 0 disturbs UE very large, or RNTP bitmap is 1 but very little to UE interference situation, thus adapts to network load dynamic change.Further, the second community according to the RNTP value of the tolerable RNTP thresholding adjustment received self, can not need to carry out data interaction with OAM, reduces the workload of background data base, improve execution efficiency.

Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus they storages can be performed by calculation element in the storage device, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (11)

1. a downlink inter-cell interference coordination method, is characterized in that, comprising:

The edge performance index of the first community described in the first Cell statistical, the second community and described first community adjacent cell each other;

When the edge performance index of described first community does not meet the preset requirement of described first community or enough meets the preset requirement of described first community, described first community sends the tolerable Relative Narrowband TX Power RNTP thresholding of described first community to described second community, and described edge performance index comprises edge cannot meet the number of the UE of QoS parameter QOS or the number of Radio Link Failure UE or the throughput at edge;

Described second community is according to the RNTP value of the tolerable RNTP thresholding adjustment received self.

2. method according to claim 1, is characterized in that, described second community, according to the RNTP value of the tolerable RNTP thresholding adjustment received self, comprising:

When described second community receives the tolerable RNTP thresholding of multiple adjacent cell transmission simultaneously,

During the RNTP value of tolerable RNTP thresholding lower than described second community that at least one adjacent cell sends if exist in other adjacent cells, described second community reduces described RNTP value according to this tolerable RNTP thresholding;

If during the RNTP value of the tolerable RNTP thresholding that described other adjacent cells send all higher than described second community, described RNTP value is improved according to the tolerable RNTP thresholding of reception in described second community.

3. method according to claim 2, it is characterized in that, described second community, according to after the RNTP value of the tolerable RNTP thresholding adjustment received self, also comprises: described second community is according to the power on the tolerable RNTP thresholding adjustment restricted physical resources block PRB received.

4. method according to claim 3, is characterized in that, described second community adjusts the power on limited PRB according to the tolerable RNTP thresholding received, comprising:

During the RNTP value of tolerable RNTP thresholding lower than described second community that at least one adjacent cell sends if exist in other adjacent cells described, described second community is according to the power on the described limited PRB of this tolerable RNTP thresholding reduction;

If during the RNTP value of the tolerable RNTP thresholding that described other adjacent cells send all higher than described second community, described second community is according to the power on the described limited PRB of tolerable RNTP thresholding raising received.

5. the method according to any one of Claims 1-4, it is characterized in that, described first community also comprises: described first community calculates the tolerable RNTP thresholding of described first community as follows before sending the tolerable RNTP thresholding of described first community to described second community:

Calculate the PRB shared by described first guarantee edge, community all user UE QoS parameter QOS;

Get all edge UE to take on PRB minimum transmitting power in category-A sign resources elements RE and be normalized according to average power;

Normalized value is rounded to the tolerable RNTP thresholding obtaining described first community downwards.

6. the method according to any one of Claims 1-4, is characterized in that, described first community sends the tolerable RNTP thresholding of described first community to described second community, comprising:

Described first community utilizes X2 interface mutual LOAD INFORMATION message to send the tolerable RNTP thresholding of described first community, wherein, in described LOAD INFORMATION message, the tolerable RNTP thresholding attribute of described first community and the position of RNTP value attribute walk abreast.

7. a descending Inter-Cell Interference Coordination system, is characterized in that, at least comprises the first community and second community of adjacent cell each other:

Described first community, for adding up the edge performance index of described first community; When the edge performance index of described first community does not meet the preset requirement of described first community or enough meets the preset requirement of described first community, described first community sends the tolerable Relative Narrowband TX Power RNTP thresholding of described first community to described second community, and described edge performance index comprises edge cannot meet the number of the user UE of QoS parameter QOS or the number of Radio Link Failure UE or the throughput at edge;

Described second community, for the RNTP value according to the tolerable RNTP thresholding adjustment received self.

8. system according to claim 7, it is characterized in that, described second community also for receive when described second community simultaneously other adjacent cells multiple send tolerable RNTP thresholding time, during the RNTP value of tolerable RNTP thresholding lower than described second community that at least one adjacent cell sends if exist in other adjacent cells described, reduce described RNTP value according to this tolerable RNTP thresholding; If during the RNTP value of the tolerable RNTP thresholding that described other adjacent cells send all higher than described second community, the tolerable RNTP thresholding according to reception improves described RNTP value.

9. system according to claim 8, is characterized in that, described second community is also for adjusting the power on restricted physical resources block PRB according to the tolerable RNTP thresholding received.

10. system according to claim 9, it is characterized in that, if described second community is also for existing the RNTP value of tolerable RNTP thresholding lower than described second community that at least one adjacent cell sends in other adjacent cells described time, according to the power on the described limited PRB of this tolerable RNTP thresholding reduction; If during the RNTP value of the tolerable RNTP thresholding that described other adjacent cells send all higher than described second community, according to the power on the described limited PRB of tolerable RNTP thresholding raising received.

11. systems according to any one of claim 7 to 10, it is characterized in that, described first community is also for calculating the tolerable RNTP thresholding of described first community as follows:

Calculate the PRB shared by first guarantee edge, community all user UE QoS parameter QOS;

Get all edge UE to take on PRB minimum transmitting power in category-A sign resources elements RE and be normalized according to average power;

Normalized value is rounded to the tolerable RNTP thresholding obtaining described first community downwards.