CN105554772A - LTE (Long Term Evolution) system interference coordination method - Google Patents
LTE (Long Term Evolution) system interference coordination method Download PDFInfo
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- CN105554772A CN105554772A CN201610037513.9A CN201610037513A CN105554772A CN 105554772 A CN105554772 A CN 105554772A CN 201610037513 A CN201610037513 A CN 201610037513A CN 105554772 A CN105554772 A CN 105554772A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/14—Spectrum sharing arrangements between different networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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Abstract
The invention discloses an LTE system interference coordination method, comprising: step 1, dividing users into center users and boundary users according to a CQI channel quality indicator report fed back by every user in every cell, wherein the boundary users are divided into legal users and default users, the default users are divided into hidden default users and obvious default users, the obvious default users are divided into absolute default users and non-absolute default users; step 2, carrying out frequency resource preliminary distribution to grouped users on all usable frequency bands of every cell according to a traditional PF proportional fairness scheduling algorithm; step 3, classifying the boundary users with preliminarily distributed frequency resources, making up the boundary users of every cell to obtain a list A and a list B; and step 4, carrying out frequency resource secondary adjustment to the cells, and finishing frequency resource distribution after adjustment.
Description
Technical field
The invention belongs to wireless communication field, relate more specifically to a kind of LTE (LongTermEvolution, Long Term Evolution) system interference coordination approach.
Background technology
3GPP (ThirdGenerationPartnershipProject, third generation partner program) normal structure will just start 3G (the3 as far back as the end of the year in 2004
rdgeneration, the 3rd generation) LTE and SAE (SystemArchitectureEvolution, System Architecture Evolution) two research and standardization effort plan greatly.Through nervous these years and work efficiently, LTE standard is ripe.LTE improves and enhances the air interface technologies of 3G, introduce OFDM (OrthogonalFrequencyDivisionMultiplexing, OFDM), MIMO (MultipleInputMultipleOutput, multiple-input, multiple-output), all-IP (InternetProtocol, Internet Protocol) the novel wireless communication technology such as networking, make air interface transmission ability reach the peak rate of descending 100Mbit/s and up 50Mbit/s, adopt flattening network configuration and all-IP systems framework to make transmission delay shorter and be more suitable for bearing data service.Therefore, 3GPPLTE is a High Data Rate, low time delay and the mobile communication system based on full grouping.
Reach the two-forty that LTE system requires, in system, the Signal to Interference plus Noise Ratio of user must be greatly improved, and improves Signal to Interference plus Noise Ratio nothing more than raising signal power and reduction interference two kinds of methods.Although system have employed many new technologies such as AMC (AdaptiveModulationandCoding, adaptive coding and modulating), MIMO and improves signal power, bring the raising of Signal to Interference plus Noise Ratio, from requiring larger gap in addition.Therefore, reduce the research key point that interference has just become LTE system as far as possible.
LTE adopts OFDMA technology (OrthogonalFrequencyDividedMultipleAccess, orthogonal frequency-time multiple access technology), OFDMA technology utilizes the orthogonality between frequency as the mode of differentiation user, the information of user is carried on mutually orthogonal different carrier wave, system can be accomplished, and frequency duplex factor as one is 1, and all communities namely in whole system coverage can use identical frequency band to provide service for the user in this community.Although the factor such as skew due to carrier frequency and phase place can cause the interference between subchannel, can be minimum by adopting advanced wireless signal Processing Algorithm make this interference drop in physical layer.Therefore the interference in community is very little, and the main interference of influential system performance is from the interference of minizone.
Fig. 1 a is the disturbed condition of LTE system down link.User 1 is NodeBA and NodeBB with the serving BS of user 2 respectively.Supposing that NodeBA distributes to user 1 for the t easet ofasubcarriers of downlink transfer is that to distribute to user 2 for the common factor that the t easet ofasubcarriers of downlink transfer is S2, S1 and S2 be S for S1, NodeBB.If S is not empty set, as shown in Figure 1a, user 1 is when accepting the downstream signal that NodeBA sends, and the subcarrier in S set will send wireless signal to user 1 simultaneously, and for user 1, these disturb exactly from NodeBB signal.If the distance between user 1 and user 2 very little (being such as all in the lap of overlay area, two Serving cells), the interference of minizone will be very strong.When occurring in the lap of overlay area, three neighboring cell, the interference of minizone will more can be serious.Analysis and the down link of the problem of inter-cell interference of up link are similar, as shown in Figure 1 b.If S is a subset, just can not produce presence of intercell interference, but LTE system adopts OFDMA technology, frequency duplex factor as one is 1 or close to 1, then S is that the probability of empty set is minimum.Therefore solving problem of inter-cell interference to improve the performance of system service performance, particularly cell edge region, is important technological problems urgently to be resolved hurrily in LTE system.
In order to solve the problem of the Cell Edge User serious interference that LTE causes owing to adopting OFDMA, 3GPP proposes multiple solution, comprises interference randomization, interference delete and interference coordination technique.Wherein, interference randomization technology comprises scrambling, IDMA (InterleavedDivisionMultipleAccess, interlacing multi-address) and frequency modulation.Interference randomization is exactly that the signal of different districts adopts different scramblers, or adopt different interlace modes, be " white noise " by interference randomization, estimate interference by statistical mathematics method, this kind of method simple possible, but the error brought due to the difference of statistical property can be caused; The effect that interference cancellation techniques can reach and interference randomization are the same, there are two kinds of methods, a kind of is suppress to eliminate interference by the space of mobile terminal multi-antenna, this Measures compare is simple, another kind is by the signal receiving of interfered cell, decoding after chnnel coding/intertexture, or use different frequency hoppings to delete interference, this method significantly can improve the systematic function of cell edge, obtain higher spectrum efficiency, but implement more complicated, cost is high, is adapted to strong interferers, and the business less for bandwidth is not too practical; Interference coordination carries out resource management control by the mode coordinated between honeycomb, under the control constraints condition that available frequency resource, transmitting power are limited, the Signal Interference and Noise Ratio that guarantee system is enough, user capacity and coverage, these constraints can distribute to time-domain resource power by the useful time-domain resource and restriction limiting explorer realizes.
In all interference solutions, interference coordination technique at present maximum LTE interference management techniques is discussed.The core concept of the interference coordination technique of LTE system is to adopt channeling technology, and it makes the distance of the interference signal source between neighbor cell far away as much as possible, thus suppresses the interference of neighbor cell, reaches the effect improved transmission quality, improve throughput.There is following several classical interference coordination schemes: FFR (FractionalFrequencyReuse, partial frequency multiplexing), SFR (SoftFrequencyReuse, soft-frequency reuse) etc.FFR, once proposition, serves good inhibitory action to interference, its simply and easily operate, the use restriction of sub-carrier is strict, but sacrifices flexibility and the spectrum efficiency of parallel compensate.For SFR, it inherits the advantage of FFR, improves the utilization ratio of frequency spectrum obviously, is now relatively more conventional a kind of interference coordination schemes.
Though it should be noted that SFR solves the low problem of the availability of frequency spectrum existing for FFR, its Resource Allocation Formula adopted makes system still there is serious problem of inter-cell interference in severe edge load situation, and marginal user performance is undesirable.Meanwhile, because the scheme based on SFR is for carry out parallel compensate respectively for central user and edge customer, after Resourse Distribute, system is dispatched again, and there is user and be distributed in situation in unfavorable resource, multi-user diversity effect is undesirable.Therefore, current SFR scheme can not solve problem of inter-cell interference under severe edge load effectively.
Below in order to this problem is described, first introduce soft-frequency reuse and the SFR mechanism of normal employing at present.
At present, whole available frequency band as shown in Figure 2, is divided into N number of subband by conventional soft-frequency reuse mechanism, and wherein X subband is used for cell edge, and N-3X subband is used for Intra-cell.Wherein X subband must be orthogonal between adjacent cell, and to eliminate interference, the large I of X changes according to Cell Edge User loading condition.By adjustment X size, channeling in various degree can be realized.Each Intra-cell uses identical frequency, and each cell edge presses the different frequency of 1/3 multiplexing use.As each cell edge need increase by 1 subband, then each frequency band all respectively need increase by 1 subband, and corresponding each Intra-cell reduces by 3 subbands.
In order to existing soft-frequency reuse mechanism is described better, the example that act one is concrete is below described.
Suppose that all communities available frequency band can be divided into 15 subbands, Cell Edge User is under slight loading condition, X value can be set as 1, and adjacent cell as the edge of community 1,2,3 the subband that uses must be mutually orthogonal, then each Intra-cell can be assigned with 15-3*1 i.e. 12 subbands.Under cell edge is severe loading condition, adjustable X value is 3, then each Intra-cell only can use 6 subbands.
To soft-frequency reuse mechanism, as shown in Figure 2, for community 1,2,3, suppose that each community available frequency band is divided into 15 subbands, under the slight loading condition of edge customer, X value is taken as 1, and after each cell frequency resources distributes, effect as shown in Figure 3.As seen from Figure 3, it is subband 1,2,3 that community 1,2,3 edge customer is assigned with frequency range, and central user can with 4th ~ 15 subbands.If it is the 1st subband that community 1 is assigned with frequency, but if the subband of the edge customer of community 1 in 4 ~ 15 scopes can obtain higher signal to noise ratio, then edge customer just can not obtain optimal system performance in institute's dividing frequency resource.Meanwhile, if center user can obtain more high s/n ratio on subband 1 ~ 3, after caning be passed through soft-frequency reuse mechanism Resources allocation, center user cannot obtain optimal system performance equally.Therefore, system can not obtain considerable multi-user diversity gain.
And, when community is under edge customer severe loading condition, namely when the traffic carrying capacity of cell edge is larger, it distributes mutually orthogonal Main subcarriers to different districts and the frequency duplex factor as one between community still can be brought to increase, namely X is worth increasing gradually, central user available frequency band reduces gradually, system spectrum utilance degradation.
By discussing above, can know, under soft-frequency reuse mechanism, system multi-user diversity is poor, and when edge service amount is larger, and the availability of frequency spectrum is low, and the performance of systematic function especially edge customer is undesirable.
Summary of the invention
Goal of the invention: in view of the problem of prior art, the present invention proposes a kind of novel LTE system disturbance coordination method, comprises the steps:
Step 1, according to the CQI of user feedback each in community (ChannelQualityIndicator, channel quality indicates) channel quality indication report by user centered by user grouping and edge customer;
Step 2, traditionally PF (ProportionalFair, equitable proportion) proportional fair scheduling to grouping after user in community the enterprising line frequency resource of all available frequency bands tentatively distribute;
Step 3, edge customer after preliminary dividing frequency resource is classified, and each Cell Edge User is carried out arrangement and draw list A (list A is the edge customer set of certain sector of certain observation subdistrict), list B (list B is the edge customer set of the adjacent sectors of this neighbor cell, sector);
Step 4, carries out the adjustment of frequency resource secondary to community, and after adjustment, frequency resource allocation is complete.
Wherein, in step 1, channel quality indicated value higher than user centered by threshold value (3dB), otherwise is edge customer.
In step 1, described edge customer is divided into validated user and promise breaking user, and promise breaking user is divided into hidden promise breaking user and aobvious promise breaking user, and aobvious promise breaking user is divided into definitely break a contract user and non-definitely to break a contract user.
Step 2 comprises the steps:
Step 2-1, is divided into three parts by frequency resource, marginal frequency resource uses a part, and centre frequency resource uses remaining two parts, and neighbor cell marginal frequency resource uses different piece;
Step 2-2, traditionally PF proportional fair scheduling carries out frequency resource to all users and tentatively distributes.
Step 3 comprises: the edge customer employing centre frequency resource is divided into promise breaking user;
The edge customer employing marginal frequency resource is divided into validated user;
Institute's frequency of utilization resource is not divided into hidden promise breaking user by the promise breaking user that neighbor cell edge customer uses;
Institute's frequency of utilization resource is divided into aobvious promise breaking user by the promise breaking user that neighbor cell edge customer uses;
Institute's frequency of utilization resource is divided into non-absolute promise breaking user by the aobvious promise breaking user that neighbor cell promise breaking user uses;
Institute's frequency of utilization resource is not divided into by the aobvious promise breaking user that neighbor cell promise breaking user uses the user that definitely breaks a contract.
Step 4 comprises the steps:
Step 4-1, searches in list A whether there is promise breaking user, if exist, if this user is X, and proceeds to step 4-2, otherwise proceeds to step 4-8;
Step 4-2, checks whether user X is hidden promise breaking user, if so, proceeds to step 4-10, otherwise proceeds to step 4-3;
Step 4-3, checks whether user X is the user that definitely breaks a contract, and sets frequency resource shared by X as Y, if so, proceed to step 4-4, otherwise proceed to step 4-7;
Step 4-4, by frequency resource Y release shared by user X;
Step 4-5, searches the idle frequence resource of Cell Center User frequency range, if this frequency resource is Z;
Step 4-6, distributes to user X by frequency resource Z, it is complete to use centre frequency resource, proceeds to step 4-10;
Step 4-7, searches the promise breaking user that whether there is acquisition frequency resource Y in list B, just this frequency resource is discharged, proceed to step 4-10 if exist;
Step 4-8, in this Cell Edge User band limits, searches in list B whether there is promise breaking user, if exist, then proceeds to step 4-9, otherwise proceeds to step 4-10;
Step 4-9, by frequency resource release shared by the promise breaking user in list B;
Step 4-10, the adjustment of frequency resource secondary is complete, and frequency resource allocation terminates.
Beneficial effect:
Tradition interference coordination schemes can not obtain considerable multi-user diversity gain, and when Cell Edge User traffic carrying capacity is larger, the availability of frequency spectrum is low, and systematic function is undesirable.The present invention pays close attention to how under succession SFR advantage prerequisite, obtains considerable multi-user diversity effect, and under the load of Cell Edge User severe, improves the availability of frequency spectrum and edge customer systematic function.Therefore, the present invention can solve the defect in traditional scheme, has very important meaning to the raising of the systematic function of LTE system under edge customer severe loading condition.
Accompanying drawing explanation
To do the present invention below in conjunction with the drawings and specific embodiments and further illustrate, above-mentioned and/or otherwise advantage of the present invention will become apparent.
Fig. 1 a is LTE system dl interference schematic diagram.
Fig. 1 b is LTE system uplink channel interference schematic diagram.
Fig. 2 is soft-frequency reuse scheme schematic diagram.
Fig. 3 is effect schematic diagram after soft-frequency reuse scheme resource distributes.
Fig. 4 is that frequency of the present invention tentatively distributes rear effect schematic diagram.
Fig. 5 is frequency resource allocation principle figure of the present invention.
Fig. 6 is frequency resource allocation of space principle figure of the present invention.
Fig. 7 is edge customer of the present invention classification schematic diagram.
Fig. 8 is load instruction process schematic.
Fig. 9 is resource status reporting process.
Figure 10 is particular flow sheet of the invention process.
Figure 11 is frequency resource secondary of the present invention adjustment flow chart.
The design sketch of Figure 12 Shi Sange community after frequency resource is tentatively distributed.
Figure 13 is the effect schematic diagram of certain community after executing frequency allocation scheme of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is illustrated.It is noted that described embodiment is only for illustrative purposes, instead of limitation of the scope of the invention.
As shown in Figure 10, the present invention includes following steps:
Step 1, according to the CQI of user feedback each in community (ChannelQualityIndicator, channel quality indicates) channel quality indication report by user centered by user grouping and edge customer;
Step 2, traditionally PF (ProportionalFair, equitable proportion) proportional fair scheduling to grouping after user in community the enterprising line frequency resource of all available frequency bands tentatively distribute;
Step 3, edge customer after preliminary dividing frequency resource is classified, and each Cell Edge User is carried out arrangement and draw list A (list A is the edge customer set of certain sector of certain observation subdistrict), list B (list B is the edge customer set of the adjacent sectors of this neighbor cell, sector);
Step 4, carries out the adjustment of frequency resource secondary to community, and after adjustment, frequency resource allocation is complete.
Wherein, in step 1, channel quality indicated value higher than user centered by threshold value (3dB), otherwise is edge customer.
In step 1, described edge customer is divided into validated user and promise breaking user, and promise breaking user is divided into hidden promise breaking user and aobvious promise breaking user, and aobvious promise breaking user is divided into definitely break a contract user and non-definitely to break a contract user.
Step 2 comprises the steps:
Step 2-1, is divided into three parts by frequency resource, marginal frequency resource uses a part, and centre frequency resource uses remaining two parts, and neighbor cell marginal frequency resource uses different piece;
Step 2-2, traditionally PF proportional fair scheduling carries out frequency resource to all users and tentatively distributes.
Step 3 comprises: the edge customer employing centre frequency resource is divided into promise breaking user;
The edge customer employing marginal frequency resource is divided into validated user;
Institute's frequency of utilization resource is not divided into hidden promise breaking user by the promise breaking user that neighbor cell edge customer uses;
Institute's frequency of utilization resource is divided into aobvious promise breaking user by the promise breaking user that neighbor cell edge customer uses;
Institute's frequency of utilization resource is divided into non-absolute promise breaking user by the aobvious promise breaking user that neighbor cell promise breaking user uses;
Institute's frequency of utilization resource is not divided into by the aobvious promise breaking user that neighbor cell promise breaking user uses the user that definitely breaks a contract.
As shown in figure 11, step 4 comprises the steps:
Step 4-1, searches in list A whether there is promise breaking user, if exist, if this user is X, and proceeds to step 4-2, otherwise proceeds to step 4-8;
Step 4-2, checks whether user X is hidden promise breaking user, if so, proceeds to step 4-10, otherwise proceeds to step 4-3;
Step 4-3, checks whether user X is the user that definitely breaks a contract, and sets frequency resource shared by X as Y, if so, proceed to step 4-4, otherwise proceed to step 4-7;
Step 4-4, by frequency resource Y release shared by user X;
Step 4-5, searches the idle frequence resource of Cell Center User frequency range, if this frequency resource is Z;
Step 4-6, distributes to user X by frequency resource Z, it is complete to use centre frequency resource, proceeds to step 4-10;
Step 4-7, searches the promise breaking user that whether there is acquisition frequency resource Y in list B, just this frequency resource is discharged, proceed to step 4-10 if exist;
Step 4-8, in this Cell Edge User band limits, searches in list B whether there is promise breaking user, if exist, then proceeds to step 4-9, otherwise proceeds to step 4-10;
Step 4-9, by frequency resource release shared by the promise breaking user in list B;
Step 4-10, the adjustment of frequency resource secondary is complete, and frequency resource allocation terminates.
In the present invention, first, by user and edge customer centered by the user grouping in community, then the frequency resource of carrying out based on conventional P F proportional fair scheduling is tentatively distributed, namely in all frequency ranges, central user and edge customer is not distinguished, carry out the scheduling based on PF algorithm to all users, finally draw the preliminary distribution list of resource, after preliminary distribution, effect as shown in Figure 4.
After preliminary distributing user resource, for edge customer, classify according to following rule to the edge customer be on different resource, rule is as follows:
First, in the bandwidth used community, all subcarriers are according to the frequency resource splitting scheme of Fig. 5, are divided into three subset Ι
1, Ι
2, Ι
3, and the subcarrier non-overlapping copies in these three subsets.And by as shown in Figure 6, be inside and outside two-layer by each community according to the different demarcation of edge customer and central user, Ι
1, Ι
2, Ι
3corresponded in each community of system by different patterns respectively.Frequency resource allocation principle need guarantee that the subset set group that three adjacent communities match must be Ι
1, Ι
2, Ι
3a permutation and combination.
Secondly, with reference to Fig. 5, suppose that community 1 is reference cell, to certain sector in community 1, if be Ι in 1/3 frequency band range that Cell Edge User should belong to of resource shared by edge customer for this reason
1in, then this user is validated user, as user a; If not at Ι
1in, be then promise breaking user.If shared by this promise breaking user, resource is not used by adjacent sectors, neighbor cell edge customer, be then hidden promise breaking user, as user b resource should belong to Ι at community 2 edge customer
2in scope, but community 2 does not have edge customer using this resource, and user b is just hidden promise breaking user; Otherwise, be aobvious promise breaking user.If resource is x shared by aobvious promise breaking user, if use the edge customer of x resource for promise breaking user in neighbor cell, the aobvious promise breaking user in Ze Ci community 1 is non-absolute promise breaking user; Otherwise, be just the user that definitely breaks a contract.If user c institute Resources allocation is not at Ι
1in, and in community 3, user d is also using resource herein, and as can be seen from Figure, the Ι that user d resource Bu community 3 edge customer should belong to
3in scope, user d is promise breaking user, then user c is just non-absolute promise breaking user; And although user e resource is not equally at Ι
1in, and in community 3, user f is assigned with this resource, but user f is at the Ι that should belong to
3in, be validated user, then user e is just the user that definitely breaks a contract.Edge customer classification chart as shown in Figure 7.
Finally, after edge customer class definition, arrangement is carried out to it and draws list A, B, carry out resource secondary adjustment to be used for cooperation.List A is the edge customer set of certain sector, community; The edge customer set of list B adjacent sectors, neighbor cell, sector for this reason.
After above preparation completes, the adjustment of frequency resource secondary is carried out to community.Take appropriate measures for different edges user type, namely after passing through progressively to search preliminary Resources allocation, edge customer type in the frequency range of community on used resource, once find the user that definitely breaks a contract, just discharge the frequency resource that this user is taking, by searching the idle frequence resource of the central user frequency range shown in Fig. 5, just then use these idling-resources, so far, the adjustment of frequency resource secondary terminates, and frequency resource allocation is complete.
This interference coordination schemes, reference cell needs the resource using information collecting neighbor cell.In LTE system, this information carries out Signalling exchange by X2 interface, thus carries out interference coordination.Two adjacent communities, after X2 interface is set up, adopt the following X2 interface management process relevant with interference coordination to coordinate the execution of this scheme:
1. load instruction
Load instruction process is used for transmitting the regulation and control information on load of homogeneous-frequency adjacent-domain and the harmony messages of interference between base station, as shown in Figure 8.This process uses non-UE related signaling.
Process is initiated by sending LOADINFORMATION message (information on load) to the base station controlling homogeneous-frequency adjacent-domain in a base station, can comprise following message in LOADINFORMATION message:
(1) CellID: user ID
(2)ULInterferenceOverloadIndication
(3)ULHighInterferenceInformation
(4) RelativeNarrowbandTxPower (RNTP) relevant arrowband Tx power;
If comprise ULInterferenceOverloadIndicationIE in LOADINFORMATION, it indicates the interference rank of designated cell, and this interference rank is for all Resource Block in this community.The eNB of receipt message can consider these information when setting its scheduling strategy.If LOADINFORMATION comprises ULHighInterferenceInformationIE, so it all indicates the appearance of its high interference sensitivity for each Resource Block sending base station.For these Resource Block, reception base station should avoid the scheduling to Cell Edge User as possible.
2. resource status report
This process is initiated by base station 2, reports the result of its measurement of asking in resource status report initialization procedure, as shown in Figure 9 to base station 1.This process uses non-UE related signaling.
Base station 2 requires to each its measurement result of cell report that report is measured.(resource status report) RESOURCESTATUSREPORT message can comprise following parameter:
(1) eNB1MeasurementIDIE: the measurement ID distributed in base station 1.
(2) eNB2MeasurementIDIE: the measurement ID distributed in base station 2.
(3) CellMeasurementResultIE: the result providing cell measurement.
①CellID。
2. HardwareLoadIndicatorIE: the situation that the hardware providing community to bear meets.
3. S1TNLLoadIndicatorIE: the situation of the S1 transport network layer load providing community to bear.
4. RadioResourceStatusIE: the service condition providing uplink and downlink Resource Block in community.
Embodiment
If Fig. 6 small area 1 is reference cell, have 3 sectors in community, every sector users is 12, community RB (ResourceBlock, Resource Block) number is 24, and each RB comprises 12 continuous print subcarriers on frequency domain, subcarrier width is 15kHz, RB frequency interval is 180kHz.Namely a time slot adopts video business, and business datum amount is 64kb/s.Suppose that sector, community is after users classification, have 7 edge customers, 5 central user.
As shown in figure 12, the design sketch of community 1,2,3 after frequency resource is tentatively distributed is respectively.For community 1, if resource does not have identifying user type in figure, represent this resource idle, not by CU, to community 2,3, certain customers' type identification omits.Wherein, the legal frequency range of edge customer in 1st ~ 8 GeRBWei communities 1; The legal frequency range of edge customer in 9th ~ 16 GeRBWei communities 2; The legal frequency range of edge customer in 17th ~ 24 GeRBWei communities 3.As can be seen from Figure, it is in legal edge, community 1 band limits that edge customer 1 takies resource, is validated user; Resource Block shared by edge customer 2 is shared by the edge customer c of community 3, but c is promise breaking user, so user 2 is non-absolute promise breaking user, with edge customer 7; Resource shared by edge customer 3 is positioned at the legal band limits of community 2 edge customer, but shared by user in this resource Bu Bei community 2, institute thinks hidden promise breaking user, with edge customer 5; Resource shared by edge customer 4 equally use by community 2 edge customer a, and user a is validated user, then user 4 is the user that definitely breaks a contract, with user 6.
Finding edge customer 4,6 in community 1 is that after absolute promise breaking user, shared resource discharges by user 4,6, and on center bin i.e. 9th ~ 24 Resource Block, search idling-resource, idling-resource is distributed to user 4,6.As X, Y Resource Block carves the free time at this moment, then used to user 4,6.Figure 13 is the effect schematic diagram of community 1 after executing frequency allocation scheme of the present invention.
From upper surface analysis, the present invention can improve system multi-user diversity, and improves the availability of frequency spectrum and edge customer systematic function under edge customer severe loading condition.
The invention provides a kind of LTE system disturbance coordination method; the method and access of this technical scheme of specific implementation is a lot; the above is only the preferred embodiment of the present invention; should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.The all available prior art of each part not clear and definite in the present embodiment is realized.
Claims (6)
1. a LTE system disturbance coordination method, is characterized in that: comprise the following steps:
Step 1, according to the CQI channel quality indication report of user feedback each in community by user centered by user grouping and edge customer;
Step 2, traditionally PF proportional fair scheduling to grouping after user in community the enterprising line frequency resource of all available frequency bands tentatively distribute;
Step 3, classifies to the edge customer after preliminary dividing frequency resource, and each Cell Edge User is carried out arrangement and draw list A, list B;
Step 4, carries out the adjustment of frequency resource secondary to community, and after adjustment, frequency resource allocation is complete.
2. a kind of LTE system disturbance coordination method according to claim 1, is characterized in that, in step 1, channel quality indicated value higher than user centered by threshold value, otherwise is edge customer.
3. a kind of LTE system disturbance coordination method according to claim 2, it is characterized in that, in step 1, described edge customer is divided into validated user and promise breaking user, promise breaking user is divided into hidden promise breaking user and aobvious promise breaking user, and aobvious promise breaking user is divided into definitely break a contract user and non-definitely to break a contract user.
4. a kind of LTE system disturbance coordination method according to claim 3, it is characterized in that, step 2 comprises the steps:
Step 2-1, is divided into three parts by frequency resource, marginal frequency resource uses a part, and centre frequency resource uses remaining two parts, and neighbor cell marginal frequency resource uses different piece;
Step 2-2, traditionally PF proportional fair scheduling carries out frequency resource to all users and tentatively distributes.
5. a kind of LTE system disturbance coordination method according to claim 4, it is characterized in that, step 3 comprises:
The edge customer employing centre frequency resource is divided into promise breaking user;
The edge customer employing marginal frequency resource is divided into validated user;
Institute's frequency of utilization resource is not divided into hidden promise breaking user by the promise breaking user that neighbor cell edge customer uses;
Institute's frequency of utilization resource is divided into aobvious promise breaking user by the promise breaking user that neighbor cell edge customer uses;
Institute's frequency of utilization resource is divided into non-absolute promise breaking user by the aobvious promise breaking user that neighbor cell promise breaking user uses;
Institute's frequency of utilization resource is not divided into by the aobvious promise breaking user that neighbor cell promise breaking user uses the user that definitely breaks a contract.
6. a kind of LTE system disturbance coordination method according to claim 5, it is characterized in that, step 4 comprises the steps:
Step 4-1, searches in list A whether there is promise breaking user, if exist, if this user is X, and proceeds to step 4-2, otherwise proceeds to step 4-8;
Step 4-2, checks whether user X is hidden promise breaking user, if so, proceeds to step 4-10, otherwise proceeds to step 4-3;
Step 4-3, checks whether user X is the user that definitely breaks a contract, and sets frequency resource shared by X as Y, if so, proceed to step 4-4, otherwise proceed to step 4-7;
Step 4-4, by frequency resource Y release shared by user X;
Step 4-5, searches the idle frequence resource of Cell Center User frequency range, if this frequency resource is Z;
Step 4-6, distributes to user X by frequency resource Z, it is complete to use centre frequency resource, proceeds to step 4-10;
Step 4-7, searches the promise breaking user that whether there is acquisition frequency resource Y in list B, just this frequency resource is discharged, proceed to step 4-10 if exist;
Step 4-8, in this Cell Edge User band limits, searches in list B whether there is promise breaking user, if exist, then proceeds to step 4-9, otherwise proceeds to step 4-10;
Step 4-9, by frequency resource release shared by the promise breaking user in list B;
Step 4-10, the adjustment of frequency resource secondary is complete, and frequency resource allocation terminates.
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