CN103428702B - A kind of resource allocation methods controlling presence of intercell interference - Google Patents
A kind of resource allocation methods controlling presence of intercell interference Download PDFInfo
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Abstract
The invention provides a kind of resource allocation methods of combining with interference coordination of scheduling, comprise the steps: A, by each community can frequency resource be divided into edge band and center frequency-band, the edge band of adjacent co-frequency cell is the most overlapping；The interference effect size of each user equipment (UE) in B, calculating community；C, according in community each UE interference effect size set user dispatching priority, the dispatching priority disturbing bigger UE is relatively low；D, in assignable frequency band range, available band is used and is allocated by the dispatching priority of UE, wherein, the higher UE priority scheduling of dispatching priority is to center frequency-band, and the relatively low UE priority scheduling of dispatching priority is to edge band.The present invention can improve band efficiency relative to prior art.
Description
Technical field
The present invention relates to mobile communication technology field, particularly relate to a kind of resource allocation methods controlling presence of intercell interference.
Background technology
In cellular radio Communication system based on OFDM (OFDM) technology, intra-cell users is multiple by frequency division
By the orthogonal problem to solve intra-cell interference realizing signal.But as cost, identical networking can bring stronger community
Between disturb.Meanwhile, Cell Edge User uses bigger transmitting power, and the edge customer of adjacent cell is produced the strongest interference,
Have a strong impact on marginal user performance, the most how to reduce presence of intercell interference, improve marginal user performance, become wireless communication system
An important subject.For improving the marginal user performance in community, it is necessary to use Inter-Cell Interference Coordination scheme.
Mostly existing interference coordination technique is to carry out AF panel by channeling.Conventional static interference coordination scheme
Mainly there are partial frequency multiplexing (FFR) and soft-frequency reuse (SFR).The principle of FFR algorithm is by arranging community disabling frequency band
Cell Edge User is avoided to interfere；SFR algorithm principle is by distributing for the edge customer of different neighbor cells
Different frequencies and power avoid Cell Edge User to interfere.Determine that user is little according to user's location
Area edge user or Cell Center User, customer location here the locus of non-user, and refer to the letter of a certain user
Road feature, generally uses Serving cell pilot frequency intensity and difference pilot to powerratio (PPR, the Pilot of neighboring cell pilot intensity
Power Ratio) this channel characteristics of user is described.By the planning of interference coordination technique, to dispatching assignable money
Source limits, and to reduce presence of intercell interference, promotes the purpose of community marginal user performance.
The channeling technology of existing static interference coordination is that neighbor cell is reserved different frequency bands and come limit, coverage cell
Edge user, limits dispatching assignable resource, but there are the following problems:
1, determine that the PPR threshold value load by community of customer edge attribute, user distribution situation are limited, in advance
If single PPR threshold value may be inaccurate in actual networking, it is impossible to adjust in real time, affect interference coordination effect；
2, when, multi-user heavier at cell load waits scheduling, dispatching flexibility reduces, it is also difficult to ensure neighbor cell
The frequency resource that edge customer uses is orthogonal, and (taking same frequency band) during resource contention does not has to carry out for the interference feature of user
Bandwidth assignment targetedly, edge user throughput and average throughput decline；
If 3 edge customers only only use center frequency-band by edge band or central user, although can distinguish neighbor cell
The frequency resource that middle edge customer uses is orthogonal, but this band efficiency is substantially reduced, especially for terminal narrow band transmission
System, throughput of system reduces.
Summary of the invention
The invention provides a kind of resource allocation methods controlling presence of intercell interference, frequency can be improved relative to prior art
Band utilization rate.
Embodiments provide the resource allocation methods that a kind of scheduling combines with interference coordination, including walking as follows
Rapid:
A, by each community can frequency resource be divided into edge band and center frequency-band, the edge of adjacent co-frequency cell
Frequency band is the most overlapping；
The interference effect size of each user equipment (UE) in B, calculating community；
C, according in community each UE interference effect size set user dispatching priority, disturb the tune of bigger UE
Degree priority is relatively low；
D, in assignable frequency band range, available band is used and is allocated by the dispatching priority of UE, wherein,
The higher UE priority scheduling of dispatching priority is to center frequency-band, and the relatively low UE priority scheduling of dispatching priority is to edge band.
It is preferred that step B includes:
B1, UE are for Serving cell and one Reference Signal Received Power RSRP of each adjacent cell measurement, and report
The base station at this UE place, base station records the RSRP that each UE reports；
B2, base station calculate pilot to powerratio PPR: described PPR of each user be user arrive the RSRP of Target cell with to neighbour
The difference of the RSRP of community；
B3, base station take the minimum PPR value PPR as this user of the most all adjacent cells of this user.
It is preferred that step C includes:
C1, one minimum PPR thresholding of setting, be less than the user of minimum PPR thresholding as first kind user, general using PPR value
PPR value is higher than the user of minimum PPR thresholding as Equations of The Second Kind user；
C2, Equations of The Second Kind user is pressed the ascending sequence of PPR value, obtain ranking index, then according to following formula calculates
The interference effect weight factor of user:
Wherein, N is interference effect weight window, and this window is the biggest, and the interference level of user is determining that user scheduling is preferential
Ratio occupied during level is the heaviest；M is number of users to be dispatched；OrderpprI () is that the PPR value of user i is in user to be dispatched
Ranking index, Orderppr(i) ∈ [1, M]；
C3, fixed with user for interference effect weight factor dispatching priority level is multiplied, obtains this user final
Dispatching priority level；
C4, by by user according to final dispatching priority level from high to low sort formation Equations of The Second Kind user scheduling preferential
Level list.
It is preferred that step D includes:
D1, judge whether the edge band of community exists vacant available band, if so, perform step D2；Otherwise, step is gone to
Rapid D5；
D2, preferential be first kind user's dividing frequency resource at edge band；
D3, judge that whether edge band also has vacant available band, if so, perform step D4, otherwise go to step D5；
D4, afterbody from Equations of The Second Kind dispatching priority of users list start to select user's dividing frequency resource to be dispatched, directly
It is assigned to edge band, or user to be dispatched is assigned；
D5, judge whether center frequency-band exists vacant available band, if so, perform step D6, otherwise terminate this scheduling；
D6, head from Equations of The Second Kind dispatching priority of users list start to select, and are preferably the user that dispatching priority is high
Dividing frequency resource, until center frequency-band is assigned, or user to be dispatched is assigned.
It is preferred that the method farther includes:
Measure the transmission quality of the Equations of The Second Kind user carried out data transmission on center frequency-band in real time, if described transmission quality
Less than threshold value set in advance, then suspend the scheduling of the center frequency-band user to not yet dispatching in Equations of The Second Kind user, by center frequency
Band is set to busy, the user not yet dispatched return back to edge band wait scheduling in Equations of The Second Kind user.
It is preferred that the reception Signal to Interference plus Noise Ratio that object is UE of described real-time measurement.
It is preferred that the demodulation threshold that described threshold value set in advance is low-order-modulated coded system.
As can be seen from the above technical solutions, in the channeling technical foundation of existing static interference coordination, community
In the interference effect size of each user equipment (UE) the dispatching priority of each UE is set, arrive disturbing bigger UE priority scheduling
Edge band, the present invention program may produce or experienced interference situation according to user under each community, may take each community
The user of same frequency band transmission, by certain rule pairing, reduces annoyance level as far as possible.The program is particularly suited for identical networking
The scene that lower cell load is heavier.
Accompanying drawing explanation
The resource allocation methods schematic flow sheet of the control presence of intercell interference that Fig. 1 provides for the present invention；
Fig. 2 provides a kind of for the embodiment of the present invention one and weighs the possible generation of user or experienced interference size according to PPR value
Method flow diagram；
Fig. 3 is that the embodiment of the present invention two provides a kind of interference effect size according to user, and the scheduling setting user is excellent
The method flow diagram of first level；
Fig. 4 is that the embodiment of the present invention three provides a kind of method flow diagram according to dispatching priority Resources allocation.
Detailed description of the invention
The present invention proposes a kind of resource allocation methods controlling presence of intercell interference, and basic thought is, assists in static interference
On the basis of the channeling technology adjusted, in assignable frequency band range, the interference effect size in conjunction with user sets user
Dispatching priority, and then Resources allocation targetedly.May produce or experienced interference situation according to user under each community,
The user that each community may take same frequency band transmission matches by certain rule, reduces annoyance level as far as possible.The program is outstanding
It is applicable to the scene that cell load under identical networking is heavier.
For identical networking scene, resource allocation methods flow process such as Fig. 1 institute of the control presence of intercell interference that the present invention provides
Show, comprise the steps:
Step 101: according to certain ratio, by each community can frequency resource be divided into utilizing cell edge frequency band and little
District center frequency band, the edge band of adjacent co-frequency cell is the most overlapping.
Step 102: calculate the interference effect size of each user in community.
Step 103: set the dispatching priority of user according to the interference effect size of each user in community, disturb bigger
The dispatching priority of user relatively low.
Step 104: in assignable frequency band range, uses available band and carries out point by the dispatching priority of user
Joining, wherein, the user priority that dispatching priority is higher is dispatched to center frequency-band, and the relatively low user priority of dispatching priority is dispatched to
Edge band.
So, each community, by considering, is taken the user of same frequency band transmission by certain rule pairing by system.
Under the scenes to be scheduled such as, multi-user heavier at cell load, band efficiency can be improved, and effectively avoid interference user
Between collision (take same sub-band transmission).
For making the know-why of technical solution of the present invention, feature and technique effect clearer, below in conjunction with concrete real
Execute example the present invention program is described in detail.
The embodiment of the present invention one provides a kind of and weighs the possible generation of user or the side of experienced interference size according to PPR value
Method, flow process is as in figure 2 it is shown, comprise the steps:
Step 201: subscriber equipment (UE) receives merit for Serving cell and one reference signal of each adjacent cell measurement
Rate (RSRP, Reference Signal Received Power), and report the base station at this UE place, base station records each UE
The RSRP reported.
Step 202: the pilot to powerratio (PPR) of each UE of base station calculating: PPR (i)=RSRPTarget(i)-RSRPSource(i),
The difference of the RSRP for user i to Target cell and the RSRP to interference source community.Wherein, Target cell is the Serving cell of UE,
Interference source community is all communities adjacent with the Serving cell of UE.
Step 203: base station takes the minimum PPR value of the most all adjacent cells of this user (interference source community) as this user
PPR.
The PPR of user is the biggest, it is believed that user may produce or experienced interference is the least, and user is closer to Serving cell
Center；On the contrary, the PPR of user is the least, it is believed that user may produce or experienced interference is the biggest, and user is closer to Serving cell
Edge, be likely to be at Serving cell and neighbor cell collectively covers region.
The embodiment of the present invention two provides a kind of interference effect size according to user, sets the dispatching priority of user
Method.Idiographic flow is as it is shown on figure 3, comprise the steps:
Step 301: set a minimum PPR thresholding, uses PPR value as the first kind less than the user of minimum PPR thresholding
Family, is higher than the user of minimum PPR thresholding as Equations of The Second Kind user using PPR value.Described first kind user is that interference level can not hold
The user bearing, must be protected from or limiting, can only transmit in the edge band of planning, or only avoid the limit of neighbor cell
Edge frequency band.Described Equations of The Second Kind user is the user that interference level can be tolerated.
Step 302: Equations of The Second Kind user presses the ascending sequence of PPR value, obtains ranking index, then calculates the dry of user
Disturbing the weighing factor factor, formula is as follows:
Wherein, N is interference effect weight window, and this window is the biggest, and the interference level of user is determining that user scheduling is preferential
During level, occupied ratio is the heaviest, and this parameter is positive integer for span, and concrete value is with to affect user scheduling preferential
The size of other parameters of level is relevant, can be provided recommendation by system integration project；M is number of users to be dispatched；OrderpprI () is
The PPR value of user i ranking index in user to be dispatched, Orderppr(i) ∈ [1, M].
Step 303: existing with user for interference effect weight factor dispatching priority level be multiplied, obtains this user
Whole dispatching priority level.
Described existing dispatching priority level is that the factor considered according to dispatching algorithm and other needs determines, this
Bright this is not limited.
Step 304: adjust by formation Equations of The Second Kind user that user is sorted from high to low according to final dispatching priority level
Degree priority list.Under conditions of the more significant dispatching priority affecting user of interference level of user, it is believed that: PPR is the lowest,
This user is closer to edge customer, and dispatching priority is the lowest；Otherwise, PPR is the highest, and this user is closer to central user, adjusts
Degree priority is the highest.
The embodiment of the present invention three provides a kind of method according to dispatching priority Resources allocation, comprises the steps:
Step 401: judge whether the edge band of community exists vacant available band, if so, performs step 402.Otherwise,
Go to step 405.
Step 402: preferential is first kind user's dividing frequency resource at edge band.
Step 403: judge whether edge band also has vacant available band, if so, performs step 404.Otherwise go to step
Rapid 405.
Step 404: from the afterbody of Equations of The Second Kind dispatching priority of users list (sorting from high to low according to dispatching priority)
Start to select, for user's dividing frequency resource that dispatching priority is relatively low, until edge band is assigned, then perform step
405.If in this step, user to be dispatched is assigned, then process ends.
Step 405: judge whether center frequency-band exists vacant available band, if so, performs step 406.Otherwise terminate this
Secondary scheduling.
Step 406: start to select from the head of Equations of The Second Kind dispatching priority of users list, be preferably dispatching priority high
User's dividing frequency resource, until center frequency-band is assigned, or user to be dispatched is assigned.
Interfering significantly increase to reduce excessive use center frequency-band, this embodiment can further include as follows
Step:
The transmission quality measuring the Equations of The Second Kind user carried out data transmission on center frequency-band in real time (such as measures user's
Receive Signal to Interference plus Noise Ratio (SINR), and reporting base station), to adjudicate whether low priority user can use center frequency-band to carry out data
Transmission.When SINR is less than certain level, as during less than the demodulation threshold of low-order-modulated coded system, it is believed that user transmits quality relatively
Difference, suspends the scheduling of the center frequency-band user to not yet dispatching in Equations of The Second Kind user, is set to by center frequency-band busy, and Equations of The Second Kind is used
The user not yet dispatched in family return back to edge band and waits scheduling.
The present invention program having the beneficial effect that relative to prior art:
1, resource utilization is improved.In the case of PPR value is limited higher than minimum PPR, the use that interference level can be tolerated
Family need not explicitly set threshold value and comes division of cells central user and edge customer, and the lowest user of PPR value is closer to edge
User, preferentially uses edge band, and the highest user of PPR value, closer to central user, preferentially uses center frequency-band；Such as PPR value
After relatively low user is transmitted, next target dispatch user of edge band just selects from the user that PPR value is higher, quite
In a threshold value floated, it is adjusted flexibly with the status transmission of edge band or center frequency-band, improves band efficiency again
Avoid the inaccurate situation of threshold value that the factor impacts such as offered load are preset.
2, when, edge band idle at center frequency-band is busy, by less for the impact of this area interference, closer to center of housing estate
Edge customer be assigned to center frequency-band work, to neighbor cell with frequency user interference reduce as far as possible；Empty at edge band
When not busy, center frequency-band is busy, by bigger for the impact of this area interference, be assigned to edge frequency closer to the central user of cell edge
Band works, and to may produce or be protected by this community user of larger interference as far as possible, improves band efficiency, also to the greatest extent
Interference between may reducing with frequency user.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement etc. done, within should be included in the scope of protection of the invention.
Claims (5)
1. dispatch the resource allocation methods combined with interference coordination for one kind, it is characterised in that comprise the steps:
A, by each community can frequency resource be divided into edge band and center frequency-band, the edge band of adjacent co-frequency cell
The most overlapping；
The interference effect size of each user equipment (UE) in B, calculating community；
C, according in community each UE interference effect size set user dispatching priority, the scheduling disturbing bigger UE is excellent
First level is relatively low；
D, in assignable frequency band range, available band is used and is allocated by the dispatching priority of UE, wherein, scheduling
The higher UE priority scheduling of priority is to center frequency-band, and the relatively low UE priority scheduling of dispatching priority is to edge band.
Method the most according to claim 1, it is characterised in that step B includes:
B1, UE are for Serving cell and one Reference Signal Received Power RSRP of each adjacent cell measurement, and report this UE
The base station at place, base station records the RSRP that each UE reports；
B2, base station calculate pilot to powerratio PPR: described PPR of each user be user arrive the RSRP of Target cell with to adjacent cell
The difference of RSRP；
B3, base station take the minimum PPR value PPR as this user of the most all adjacent cells of this user.
Method the most according to claim 2, it is characterised in that step C includes:
C1, set a minimum PPR thresholding, using PPR value be less than minimum PPR thresholding user as first kind user, by PPR value
Higher than the user of minimum PPR thresholding as Equations of The Second Kind user；
C2, Equations of The Second Kind user is pressed the ascending sequence of PPR value, obtain ranking index, then according to following formula calculates user
Interference effect weight factor:
Wherein, N is interference effect weight window, and this window is the biggest, and the interference level of user is when determining dispatching priority of users
Occupied ratio is the heaviest；M is number of users to be dispatched；OrderpprI () is the sequence in user to be dispatched of the PPR value of user i
Index, Orderppr(i)∈[1,M]；
C3, fixed with user for interference effect weight factor dispatching priority level is multiplied, obtains the tune that this user is final
Degree levels of priority；
C4, by by user according to final dispatching priority level from high to low sort formation Equations of The Second Kind dispatching priority of users row
Table.
Method the most according to claim 3, it is characterised in that step D includes:
D1, judge whether the edge band of community exists vacant available band, if so, perform step D2；Otherwise, step is gone to
D5；
D2, preferential be first kind user's dividing frequency resource at edge band；
D3, judge that whether edge band also has vacant available band, if so, perform step D4, otherwise go to step D5；
D4, afterbody from Equations of The Second Kind dispatching priority of users list start to select user's dividing frequency resource to be dispatched, until limit
Edge bandwidth assignment is complete, or user to be dispatched is assigned；
D5, judge whether center frequency-band exists vacant available band, if so, perform step D6, otherwise terminate this scheduling；
D6, head from Equations of The Second Kind dispatching priority of users list start to select, and are preferably user's distribution that dispatching priority is high
Frequency resource, until center frequency-band is assigned, or user to be dispatched is assigned.
Method the most according to claim 4, it is characterised in that the method farther includes:
Measure the transmission quality of the Equations of The Second Kind user carried out data transmission on center frequency-band in real time, if described transmission quality is less than
Threshold value set in advance, then suspend the scheduling of the center frequency-band user to not yet dispatching in Equations of The Second Kind user, put by center frequency-band
For busy, the user not yet dispatched return back to edge band wait scheduling in Equations of The Second Kind user；The object of described real-time measurement
Reception Signal to Interference plus Noise Ratio for UE；
Described threshold value set in advance is the demodulation threshold of low-order-modulated coded system.
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| CN107454610A (en) * | 2017-07-25 | 2017-12-08 | 江苏省邮电规划设计院有限责任公司 | A kind of disturbance coordination method based on conflict avoidance mechanism in LTE system |
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| CN104981018B (en) * | 2014-04-03 | 2019-04-26 | 普天信息技术有限公司 | A kind of resource allocation methods of semi-static transmission |
| CN105007628B (en) * | 2014-04-23 | 2019-02-26 | 普天信息技术有限公司 | A kind of wireless resource allocation methods and device |
| CN111083745B (en) * | 2018-10-19 | 2022-06-07 | 成都鼎桥通信技术有限公司 | Scheduling method and device |
| CN110290588B (en) * | 2019-05-06 | 2023-05-23 | 国网浙江省电力有限公司嘉兴供电公司 | Method for allocating wireless channel resources |
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| JP5077525B2 (en) * | 2006-08-22 | 2012-11-21 | 日本電気株式会社 | Reference signal multiplexing method and radio communication apparatus in radio communication system |
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| CN101827370A (en) * | 2009-03-05 | 2010-09-08 | 中国移动通信集团公司 | Frequency reuse control method, system and base station equipment based on OFDM (Orthogonal Frequency Division Multiplexing) |
| CN101868017A (en) * | 2010-06-13 | 2010-10-20 | 中兴通讯股份有限公司 | Method and device for realizing CoMP downlink communication |
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