CN101394649A - Method and base station for lowering interference between cells in uplink cell communication system - Google Patents
Method and base station for lowering interference between cells in uplink cell communication system Download PDFInfo
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Abstract
The invention provides a method for reducing inter-cell interference in an upper cellular system and a base station applying the method. Firstly, a resource coordination method is executed among the base stations to divide recourse into a resource block subclass; then an interference overload indication method is determined among the base stations, and a disturbed threshold is determined for the resource; then, the base stations carry out the interference overload indication method based on the resource block subclass later; and when receiving an interference overload indication, the base station carries out control strategy to user equipment which uses the resource block subclass recently according to the nature of the interference overload indication and the resource block subclass, so as to achieve the purpose of retraining the interference. The control strategy comprises reduced power, resource usage restriction, transposition of the user equipment in the resource coordination method, refused interference overload indication, adjusted disturbed threshed, adjusted resource coordination method and the like. The invention effectively reduces the intra-cell interference, and has the advantages of less communication signaling cost among the base stations, stronger interference suppression pertinence and flexible, various control methods and the like.
Description
Technical field
The present invention relates to reduce the method for cochannel interference and the base station of using this method in the communication technical field, more specifically, relate to a kind of method of the reduction presence of intercell interference in the ascending honeycomb system and base station of using this method of being applied to.
Background technology
3GPP (3G (Third Generation) Moblie partner plan) tissue is the international organization in the moving communicating field, and she plays an important role in the standardization effort of 3G cellular telecommunication art.In the 6th edition standard of 3GPP, introduced HSUPA (high speed uplink packet access) technology, it is based on OFDM (OFDM) technology, and in the base station utilization fast uplink dispatching technique, make different subscriber equipmenies when uplink data sending, use different frequency spectrum resources.When formulating the HSUPA relevant criterion, the 3GPP tissue designs EUTRA (universal mobile telecommunications system of evolution and continental rise radio insert) and EUTRAN (the universal mobile telecommunications system net of evolution and continental rise radio access network) since the second half year in 2004, and this project is also referred to as LTE (Long Term Evolution) project.The LTE system also adopts the quick scheduling of resource in OFDM technology and the base station.The interference in the cellular system sub-district has been eliminated in the scheduling of base station on frequency domain, but the interference of minizone still exists.
Usually, cellular system is divided into several orthohexagonal sub-districts to service coverage area.In the ascending honeycomb system, cell base station is user equipment allocation ascending resource (abbreviating resource hereinafter as), and resource generally comprises time interval resource, frequency spectrum resource, also may comprise code source etc.In real system, because whole resource is by all cell reuse, when two subscriber equipmenies in adjacent two sub-districts were assigned to identical resource, cochannel will take place these two subscriber equipmenies disturbed, and this interference is especially serious when above-mentioned two subscriber equipmenies all are positioned at cell boarder.Therefore, the cochannel that needs the corresponding resource coordination method of design to reduce between subscriber equipment disturbs.
In some technical literatures,, have four kinds of resource coordination methods to can be used for reducing presence of intercell interference at the ascending honeycomb system:
(1) method of simple minizone resource coordination: a part of resource is only used in each sub-district, be called " cell-specific resource ", and the private resource that guarantees neighbor cell does not have overlapping, disturbs thereby avoid producing serious cochannel between the subscriber equipment at cell boarder place.Because each cell-specific resource can not be multiplexing by neighbor cell, thereby its spectrum reuse coefficient reduces greatly, causes the total speed of transfer of data of system obviously to descend.Referring to patent: " reducing the sub-carrier wave distribution method of presence of intercell interference in the OFDM cellular environment ", application (patent) number: 200480006260.4, open (bulletin) number: CN1759582 applies for (patent right) people: LG Electronics Inc.;
(2) have the method for the minizone resource coordination of higher spectrum reuse coefficient: each sub-district marks off specific resource for boundary user equipment wherein, be called " boundary user device-specific resource ", and the boundary user device-specific resource between the assurance neighbor cell does not have overlapping, disturbs thereby avoid producing between the subscriber equipment at cell boarder place serious cochannel.This boundary user device-specific resource can be multiplexing by the non-boundary user equipment in the neighbor cell, thereby its spectrum reuse coefficient is higher.Referring to document: 3GPP, R1-050629, " Inter-cellinterference mitigation ", Huawei (3GPP document, numbering: R1-050629, " inter-cell interference restraint method ", Huawei company);
(3) method of the minizone resource coordination of Zeng Qianging: the base station is according to the anti-interference of each subscriber equipment and the situation of disturbing subscriber equipment in the neighbor cell, distribute different resources use right limits, for the subscriber equipment that is easy to disturb subscriber equipment in the neighbor cell, its rights of using of base station limits to resource, and may reduce its transmitting power; For the subscriber equipment that is not easy to disturb subscriber equipment in the neighbor cell, its resources use right limit is relaxed in the base station, or may improve its transmitting power, this method when realize reducing the target of presence of intercell interference, advantage such as have that the spectrum reuse coefficient is higher, Signalling exchange is less between subscriber equipment and base station.Referring to document: 3GPP, R1-072051, " Uplink Inter-cell Interference Management for LTE ", Sharp (3GPP document, numbering: R1-072051, " the uplink interference management of LTE system ", Sharp company);
(4) method that combines with interference eliminated of minizone resource coordination: whole resource is had the resource that is not divided into suitable resource coordination and the resource of suitable interference eliminated with occuring simultaneously, for the resource that is suitable for resource coordination, the cochannel that adopts resource coordination method (2) to reduce between subscriber equipment disturbs; For the resource that is suitable for interference eliminated, utilization multi-user installation detection technique is carried out the demodulation sign indicating number to co-channel interference signal earlier, rebuild interference signal then, from received signal, deduct the interference signal of reconstruction again, obtain useful signal at last, thereby the cochannel of eliminating between subscriber equipment disturbs.Referring to document: 3GPP, R1-060419, " CombiningInter-cell-interference co-ordination/avoidance withcancellation in uplink and TP ", RITT, Huawei, CATT (3GPP document, numbering: R1-060419, " method and standardized text suggestion that minizone resource coordination/avoid is combined with interference eliminated ", RITT company, Huawei company, CATT company).
The common feature of resource coordination method is according to specified criteria division of resources to be become some Resource Block subclass, and is not overlapping between the related resource piece subclass of neighbor cell, or overlapping with coordinated mode; According to the jamproof situation of subscriber equipment and/or disturb situation and/or other situations of other sub-districts, make subscriber equipment use relevant Resource Block subclass, thereby the interference of neighbor cell is staggered on resource again, avoid the generation of phase mutual interference.Resource coordination is a kind of static method that suppresses interference, advantages such as it is less to have the inter base station communication signaling consumption, and complexity is lower, and interference suppressioning effect is better, but these class methods can't in short-term, the dynamic interference make timely response, this is its bigger shortcoming.
In the ascending honeycomb system of LTE, also exist a kind of mode of disturbing overload to indicate to suppress the interference of minizone, its basic mode is the interference size that is subjected to subscriber equipment in the adjacent base station on this base station measurement resource, and when disturbing above certain thresholding, then overload takes place to disturb in this base station; When disturbing not above certain thresholding, then overload does not take place to disturb in this base station.Whether this base station sends to adjacent base station by the background communication mode and disturbs the overload indication, indicate interference simply and transship, or further indicate the big or small degree of overload, or further indicate the sign that produces the subscriber equipment that disturbs in the adjacent base station again; Receive that the base station of disturbing the overload indication will reduce the transmitting power of its subscriber equipment, thereby suppress to disturb.Referring to document: 3GPP, R1-072418, " TransmissionMethod of Overload Indicator for Inter-cell Transmission PowerControl in E-UTRA Uplink ", NTT DoCoMo, NEC (3GPP document, numbering: R1-072418, " in the minizone power control of EUTRA up-link, sending the method for disturbing the overload indication ", NTT DoCoMo company, NEC Corporation).Interference overload indication method has the advantage of simple and flexible, quick response interference, but can waste the expense of more inter base station communication signaling under static or semi-static disturbed condition.
Therefore, resource coordination method and interference overload indication method all have certain limitation in actual applications.
Summary of the invention
The objective of the invention is at suppressing the bursty interference ability in the prior art lower, or the bigger problem of communication signaling expense under static, semi-static disturbed condition, the method for reduction presence of intercell interference of a kind of ascending honeycomb system and the base station of using this method are provided.
The present invention proposes the method that a kind of minizone resource coordination method and interference overload indication method combine.At first, carrying out the resource coordination method between the base station is the Resource Block subclass with division of resources, then, determine interference overload indication method between the base station, and be subjected to interference threshold, again by the interference overload indication method of base station execution based on the Resource Block subclass for described resource settings, when the base station receives the indication of interference overload, the base station is implemented control strategy according to the character of disturbing overload indication and indication Resource Block subclass thereof to the nearest subscriber equipment of this Resource Block subclass that used, and reaches the purpose that inhibition is disturbed.Described control strategy comprises that reduction power, resource use restriction, subscriber equipment replace, refuse to disturb overload to indicate, adjustment is subjected to interference threshold and adjust resource coordination method etc. in the resource coordination method.
To achieve these goals, according to the present invention, proposed to reduce in a kind of ascending honeycomb system method of presence of intercell interference, utilized resource coordination and disturb overload indication integrated processes, interference is controlled, described method comprises the steps:
Carrying out the resource coordination method between the base station is the Resource Block subclass with division of resources;
Determine interference overload indication method between the base station;
The base station is that described resource settings is subjected to interference threshold;
The interference overload indication method based on the Resource Block subclass is carried out in the base station;
When the base station receives when disturbing the overload indication, the base station is implemented control strategy according to the character of disturbing overload indication and indication Resource Block subclass thereof to the nearest subscriber equipment of this Resource Block subclass that used.
Preferably,, division of resources is become some Resource Block subclass by described resource coordination method, not overlapping between the related resource piece subclass of neighbor cell, or overlapping with coordinated mode; According to the jamproof situation of subscriber equipment and/or disturb the situation of other sub-districts, make subscriber equipment use relevant Resource Block subclass.
Preferably, by described interference overload indication method, when the interference that is subjected to subscriber equipment in the adjacent base station on the resource of base station surpasses certain thresholding, the base station will send to adjacent base station by the background communication mode and disturb the overload indication, indicate interference and transship; More preferably, the base station will send to adjacent base station by the background communication mode and disturb the overload indication, further indicate the big or small degree of overload; More preferably, the base station will send to adjacent base station by the background communication mode and disturb the overload indication, further indicate the sign that produces the subscriber equipment that disturbs in the adjacent base station.
Preferably, the base station utilizes described resource coordination method,, sets respectively for each Resource Block subclass and to be subjected to interference threshold because the big or small degree of being disturbed that causes of described division of resources according to described each Resource Block subclass; Perhaps, the big or small degree that the base station is disturbed according to affiliated resource integral body is for described resource settings is subjected to interference threshold.
Preferably, the base station perhaps according to the situation of cutting apart of own resource piece subclass, sends the indication of interference overload to adjacent base station according to the situation of cutting apart of adjacent base station resource piece subclass; More preferably, the position that the Resource Block subclass of transshipping takes place to disturb is further indicated with signaling in the base station.
Preferably, the character of described Resource Block subclass comprises: use the jamproof situation of the subscriber equipment of the base station of this Resource Block subclass and adjacent base station and described subscriber equipment and/or disturb the situation of other sub-districts.
In addition, described control strategy comprises: the power of the subscriber equipment that reduce to produce disturbs, the resource that produces the subscriber equipment that disturbs is made as restriction, will produce that the interference that subscriber equipment replace, adjacent base station is refused in the base station overload of disturbing is indicated, the base station adjustment is subjected to interference threshold and base station adjustment resource coordination method in the resource coordination method.
On the other hand, the base station of application said method comprises:
Resource Block subclass partitioning portion is used for carrying out the resource coordination method between the base station, is the Resource Block subclass with division of resources;
The interference overload indication method determining section is used for determining interference overload indication method between the base station;
Interference threshold is provided with part, is used to described resource settings to be subjected to interference threshold;
The interference overload indication method operating part is used to carry out the interference overload indication method based on the Resource Block subclass;
The subscriber equipment control section, when the base station receives the indication of interference overload, according to the character of indication of the overload of the interference in the determined interference overload indication method of interference overload indication method determining section and indication Resource Block subclass thereof, the nearest subscriber equipment of this Resource Block subclass that used is implemented control strategy.
Thus, reduce the method for presence of intercell interference and the base station of using this method in the ascending honeycomb communication system that the present invention proposes, from two of static mode (resource coordination method) and dynamical fashions (interference overload indication method) not ipsilateral unite the presence of intercell interference the ascending honeycomb communication system suppressed, having static interference suppresses and the response dynamics interference capability, and static interference suppresses to significantly reduce the inter base station communication signaling consumption; Interference overload indication by based on the resource coordination method makes the specific aim of Interference Control stronger; Adopt various control strategies such as adjusting resource coordination method and adjustment interference overload indication method, make control mode versatile and flexible, it is better to suppress interference effect.So the present invention can effectively reduce the interference of minizone in the ascending honeycomb system, and it is less to have an inter base station communication signaling consumption, disturbs advantages such as to suppress specific aim stronger, and control method is versatile and flexible.
Description of drawings
By below in conjunction with description of drawings the preferred embodiments of the present invention, will make above-mentioned and other purpose of the present invention, feature and advantage clearer, wherein:
Fig. 1 is the schematic diagram of multi cell cellular communication system;
Fig. 2 is the flow chart of inter-cell interference restraint method of the present invention;
Fig. 3 is the schematic diagram of the resource coordination pattern between the base station 200～204;
Fig. 4 is the enforcement schematic diagram that adopts interference overload indication method between the base station 200～204;
Fig. 5 is in the present embodiment, when the base station is carried out based on the indication of the interference of Resource Block subclass overload according to the situation of cutting apart of adjacent base station resource piece subclass, and the detail flowchart of step 520;
Fig. 6 is in the present embodiment, when the base station is carried out based on the indication of the interference of Resource Block subclass overload according to the situation of cutting apart of own resource piece subclass, and the detail flowchart of step 520; And
Fig. 7 is the schematic block diagram of base station of the method for the above-mentioned reduction presence of intercell interference of application according to the present invention.
Embodiment
To a preferred embodiment of the present invention will be described in detail, having omitted in the description process is unnecessary details and function for the present invention with reference to the accompanying drawings, obscures to prevent that the understanding of the present invention from causing.
At length set forth performing step of the present invention for clear, provide specific embodiments of the invention below, be applicable to up LTE cellular communication system.Need to prove, the invention is not restricted to this application, but applicable to other communication systems.
With reference to figure 1, wherein shown the schematic diagram of a multi cell cellular communication system.Cellular system is divided into the wireless coverage area that joins, i.e. sub-district to service coverage area.In Fig. 1, the sub-district schematically is depicted as regular hexagon, and whole coverage is spliced by sub-district 100～104.Relevant respectively with sub-district 100～104 is base station 200～204.Each of base station 200～204 comprises a transmitter, a receiver and a base station controller, and this is known in the field.In Fig. 1, base station 200～204 schematically is depicted as a certain zone that is positioned at sub-district 100～104, and is equipped with omnidirectional antenna.But in the cell layout of cellular communication system, base station 200～204 can be equipped with directional antenna, and the subregion of direction ground coverage cell 100～104 is arranged, and this subregion is commonly called the sector.Therefore, the expression of the multi cell cellular communication system of Fig. 1 only is for illustrative purpose, and does not mean that the present invention needs above-mentioned restrictive specified conditions in the enforcement of cellular system.
In Fig. 1, base station 200～204 is connected with each other by X2 interface 300～304.In the LTE system, three node layer network configurations of base station, radio network controller and core net are simplified to the two-layer node structure.Wherein, the function of radio network controller is divided into the base station, and the base station is coordinated by the wireline interface of " X2 " by name with the base station and communicated by letter.
In Fig. 1, several subscriber equipmenies 400～430 are distributing in the sub-district 100～104.Each of subscriber equipment 400～430 comprises a transmitter, a receiver and a mobile terminal controller, and this is known in the present technique field.Subscriber equipment 400～430 is by inserting cellular communication system for the serving BS of service separately (in the base station 200～204 some).Should be understood that though 16 subscriber equipmenies that only schematically draw among Fig. 1, the number of the subscriber equipment in the actual conditions is quite huge.In this sense, Fig. 1 for subscriber equipment to describe also only be illustrative purpose.Subscriber equipment 400～430 is by inserting cellular communications networks for serving base station 200～204 separately, the direct serving BS that provides the base station of communication service to be called as this subscriber equipment for certain subscriber equipment, and other base stations are called as the non-serving base stations of this subscriber equipment.
The flow chart of inter-cell interference restraint method of the present invention may further comprise the steps as shown in Figure 2:
Step 500: carrying out the resource coordination method between the base station is the Resource Block subclass with division of resources.In the present embodiment, if resource coordination method (2) (3GPP is adopted in base station 200～204, R1-050629, " Inter-cell interference mitigation ", Huawei), each base station is central user device-specific resource and boundary user device-specific resource with resource division, and the schematic diagram of its resource coordination pattern as shown in Figure 3.It is pointed out that selected resource coordination method (2) only is the execution mode that this patent is described for example, and do not mean that the present invention needs restrictive specified conditions in the enforcement of cellular system.In addition, Fig. 3 only is the schematic diagram of resource coordination method (2), and does not mean that the enforcement of resource coordination method (2) is confined to the form of Fig. 3.In multi cell cellular system shown in Figure 1, for base station 200, according to subscriber equipment 400～414 to the base station 200 path loss values subscriber equipment is divided into groups, establish subscriber equipment 400～406th, central user equipment only uses central user device-specific resource; Subscriber equipment 408～414th, boundary user equipment only uses the boundary user device resource.
Step 505: determine interference overload indication method between the base station.In the present embodiment, adopt the interference overload indication method of simple signaling, the enforcement schematic diagram of this method as shown in Figure 4, when the subscriber equipment in the base station 200 is sent to base station 202 and sends oriented interference 460 (arrow representative interference radiating way), whether base station 202 can send to base station 200 by X2 interface 300 and disturb overload indication 465 (the overload indicated direction is disturbed in the arrow representative), indicate interference simply and transship.Disturbing the data traffic of whether transshipping is 1 bit.The interference overload indication method that it is pointed out that selected simple signaling only is the execution mode that this patent is described for example, and does not mean that the present invention needs restrictive specified conditions in the enforcement of cellular system.In addition, Fig. 4 only is the schematic diagram of the interference overload indication method of simple signaling, and does not mean that the enforcement of the interference overload indication method of simple signaling is confined to the form of Fig. 4.
Step 510: the base station is that described resource settings is subjected to interference threshold.In the present embodiment, base station 200～204 is respectively boundary user device-specific resource and central user device-specific resource settings is subjected to interference threshold η
EAnd η
IIt is pointed out that and work as η
EEqual η
IThe time, the process equivalence of setting thresholding is subjected to interference threshold for the base station for the resource set overall.
Step 515: the interference overload indication method based on the Resource Block subclass is carried out in the base station.In the present embodiment, two kinds of implementations are arranged.
Mode one: the base station sends the indication of interference overload according to the situation of cutting apart of adjacent base station resource piece subclass to adjacent base station, and indicates the position that the Resource Block subclass of transshipping takes place to disturb with signaling.With base station 200 is example, cuts apart situation as reference with the Resource Block subclass of base station 202, and base station 200 is according to its interference and η that is subjected on the boundary user device-specific resource of base station 202
EMagnitude relationship; And according to its interference and η that on the central user device-specific resource of base station 202, is subjected to
IMagnitude relationship, judge to disturb and whether to transship, and send the signaling that 1 bit disturbs the overload indication, and indicate that with 1 bit signalling taking place to disturb the Resource Block subclass of transshipping is boundary user device-specific resource or central user device-specific resource again to base station 202.Above-mentioned signaling design lists is as shown in table 1:
Table 1
| Disturb the overload situations sequence number | The overload situations classification is disturbed according to the situation of cutting apart of adjacent base station resource piece subclass in the base station | Disturb the |
| 1 | Disturb not overload on the boundary user device-specific resource | 00 |
| 2 | Disturb overload on the boundary user device-specific resource | 01 |
| 3 | Disturb not overload on the central user device-specific resource | 10 |
| 4 | Disturb overload on the central user device- |
11 |
Mode two: the base station sends the indication of interference overload according to the situation of cutting apart of own resource piece subclass to adjacent base station, and indicates the position that the Resource Block subclass of transshipping takes place to disturb with signaling.With base station 200 is example, cuts apart situation as reference with the Resource Block subclass of base station 200, and base station 200 is according to its interference and η that is subjected on boundary user device-specific resource
EMagnitude relationship; And according to its interference and η that on central user device-specific resource, is subjected to
IMagnitude relationship, judge to disturb whether transship, and send the signaling that 1 bit disturbs the overload indication, and indicate that with 1 bit signalling taking place to disturb the Resource Block subclass of transshipping is boundary user device-specific resource or central user device-specific resource again to base station 202 and base station 204.Above-mentioned signaling design lists is as shown in table 2:
Table 2
| Disturb the overload situations sequence number | The overload situations classification is disturbed according to the situation of cutting apart of own resource piece subclass in the base station | Disturb the |
| 1 | Disturb not overload on the boundary user device-specific resource | 00 |
| 2 | Disturb overload on the boundary user device-specific resource | 01 |
| 3 | Disturb not overload on the central user device-specific resource | 10 |
| 4 | Disturb overload on the central user device- |
11 |
Step 520: the base station is implemented certain control strategy according to the character of disturbing overload indication and indication Resource Block subclass thereof to the nearest subscriber equipment of this Resource Block subclass that used.Step 520 comprises two sub-steps, step 517 and steps 519.Wherein, in step 517, the base station judges whether to receive disturbs the overload indication, as does not receive the indication of interference overload, then returns step 515.On the other hand, when receiving in step 517 when disturbing the overload indication, in step 519, the base station is implemented certain control strategy according to the character of disturbing overload indication and indication Resource Block subclass thereof to the nearest subscriber equipment of this Resource Block subclass that used.
In the present embodiment, the detail flowchart of this step 520 as shown in Figure 5 and Figure 6.
When employing mode one is carried out based on the indication of the interference of Resource Block subclass overload, the base station is according to the Resource Block subclass of disturbing overload indication indication, take to suppress the measure of the communication link quality and quantity of interference source subscriber equipment, and the measure that improves the communication link quality and quantity of non-interference source subscriber equipment, its detail flowchart is as shown in Figure 5.
Particularly, based on multi cell cellular system shown in Figure 1, suppose the cut apart situation of base station 202 according to the Resource Block subclass of base station 200, send the indication of interference overload by X2 interface 300 to base station 200, and the Resource Block subclass that indicates the interference overload is the boundary user device-specific resource (left-hand branch of step 5191 of base station 200, step 5191 is substeps of step 519, is used to judge that disturbing the Resource Block subclass of overload indication indication is the boundary user device-specific resource or the central user device-specific resource of base station 200).
In the boundary user equipment 408～414 of base station 200 services, select out in nearest a period of time, such as 20ms, used the boundary user device-specific resource of base station 200, and the subscriber equipment of larger interference was caused in base station 202, and established these subscriber equipmenies and constitute set Λ.If base station 200 can't be by disturbing the overload indication, subscriber equipment judges it specifically is which subscriber equipment causes larger interference to base station 202 to the information such as path loss of neighbor cell, then base station 200 was thought in nearest a period of time, such as 20ms, used the boundary user equipment of the boundary user device-specific resource of base station 200 to constitute set Λ.Such as, in Fig. 1, subscriber equipment 408 and 410 constitutes user device set Λ.
For user device set Λ, adoptable control strategy has:
Step 610: base station 200 reduces the transmitting power of subscriber equipment among the Λ.Typical method such as: the transmitting power of subscriber equipment among the Λ is descended one by one with step-length γ dB, rises the upper limit P of power control value more one by one with step-length γ dB when disturbing the overload indication not receiving
MaxWith lower limit P
MinDetermine by the base station.This control strategy is as the formula (1):
Need to prove that because subscriber equipment is the boundary user equipment of base station 200 among the Λ, and boundary user equipment is generally bigger to the contribution of disturbing, so the γ of formula (1) generally gets bigger value, as 3dB, 5dB etc.
Step 612: the use resource of subscriber equipment limits among the 200 couples of Λ in base station.Typical method such as: in a period of time after disturbing the overload indication is received in base station 200, such as 20ms, base station 200 does not allow the boundary user device-specific resource of subscriber equipment use base station 200 among the Λ, and other boundary user equipment that this resource will be assigned to base station 200 services use.
Step 614: base station 200 is adjusted and is subjected to the interference threshold value.Typical method reduces η such as: base station 200
E Base station 200 is sent on its boundary user device-specific resource more continually disturb the overload indication, suppress of the interference of the central user equipment of base station 202 or base station 204, thereby part compensates subscriber equipment among the Λ because of being disturbed the decline that suppresses the communication link quality after relevant the control to base station 200.
Step 616: the resource coordination method is adjusted in base station 200.Typical method is shunk its boundary user device-specific resources such as: base station 200, thereby under the prerequisite that does not influence resource coordination mechanism, reduces the outside interference of boundary user equipment in the base station 200.
Need to prove that step 610 to the combination of step 616 also is possible control strategy.At this,, omitted the argumentation that repeats to combined strategy for the clear succinct consideration of style of writing.
Based on multi cell cellular system shown in Figure 1, suppose the cut apart situation of base station 202 according to the Resource Block subclass of base station 200, send to base station 200 by X2 interface 300 and to disturb the overload indication, and indicate that to disturb the Resource Block subclass of overload be the central user device-specific resource (right-hand branch of step 5191) of base station 200.
In the central user equipment 400～406 of base station 200 services, select out in nearest a period of time, such as 20ms, used the central user device-specific resource of base station 200, and the subscriber equipment of larger interference was caused in base station 202, and established these subscriber equipmenies and constitute set omega.If base station 200 can't be by disturbing the overload indication, or subscriber equipment judges it specifically is which subscriber equipment causes larger interference to base station 202 to the information such as path loss of neighbor cell, then base station 200 was thought in nearest a period of time, such as 20ms, used the central user equipment of the boundary user device-specific resource of base station 202 to constitute set omega.Such as, in Fig. 1, subscriber equipment 400,402 and 406 constitutes user device set Ω.
For user device set Ω, adoptable control strategy has:
Step 620: base station 200 reduces the transmitting power of subscriber equipment among the Ω.Typical method such as: the transmitting power of subscriber equipment among the Ω is descended one by one with step-length α dB, rises the upper limit P of power control value more one by one with step-length α dB when disturbing the overload indication not receiving
MaxWith lower limit P
MinDetermine by the base station.This control strategy is as the formula (2):
Need to prove, because central user equipment is generally little to the contribution of disturbing, so the α of formula (2) generally gets less value, as 0.5dB, 1dB etc.So the relation between the γ in α in the formula (2) and the formula (1) can be α≤γ.
Step 622: the use resource of subscriber equipment limits among the 200 couples of Ω in base station.Typical method such as: in a period of time after disturbing the overload indication is received in base station 200, such as 20ms, base station 200 does not allow the central user device-specific resource of subscriber equipment use base station 200 among the Ω, and other central user equipment that this resource will be assigned to base station 200 services use.
Step 624: base station 200 makes that subscriber equipment replaces among the Ω in the resource coordination method, typical method such as: if the long-time interference base station 202 of some central user equipment among the Ω, then boundary user equipment is temporarily replaced into these central user equipment in base station 200, so, these central user equipment are attempted using different resources, avoid the boundary user equipment of base station 202 is formed interference.
Step 626: base station 200 is adjusted and is subjected to the interference threshold value.Typical method reduces η such as: base station 200
I Make base station 200 send the indication of interference overload more continually on the heart user equipment specific resource therein, suppress of the interference of the boundary user equipment of base station 202 or base station 204, thereby part compensates subscriber equipment among the Ω because of being disturbed the decline that suppresses the communication link quality after relevant the control to base station 200.
Step 628: the interference that 200 refusal base stations 202, base station send suppresses indication.Typical method sends anti-jamming by X2 interface 300 to base station 202 such as: base station 200 and suppresses indication, show that base station 200 can't cause excessive interference on the heart user equipment specific resource therein, require base station 202 on this resource, to reduce and send the frequency that disturbs the overload indication; Associative operation when simultaneously, base station 200 is not once received and disturb to be suppressed (as power rising α dB etc.).
Need to prove that step 620 to the combination of step 628 also is possible control strategy.At this,, omitted the argumentation that repeats to combined strategy for the clear succinct consideration of style of writing.
When employing mode two is carried out based on the indication of the interference of Resource Block subclass overload, the base station is according to the Resource Block subclass of disturbing overload indication indication, take to suppress the measure of the communication link quality and quantity of interference source subscriber equipment, and the measure that improves the communication link quality and quantity of non-interference source subscriber equipment, its flow chart is as shown in Figure 6.
Particularly, based on multi cell cellular system shown in Figure 1, suppose the cut apart situation of base station 202 according to own resource piece subclass, send the indication of interference overload by X2 interface 300 to base station 200, and the Resource Block subclass that indicates the interference overload is the boundary user device-specific resource (left-hand branch of step 5192 of base station 202, step 5192 is substeps of step 519, is used to judge that disturbing the Resource Block subclass of overload indication indication is the boundary user device-specific resource or the central user device-specific resource of base station 202).Because base station 200 is adjacent with base station 202, not overlapping between their the boundary user device-specific resource, so, the boundary user device-specific resource of base station 202 is central user device-specific resources of base station 200, so it is the central user equipment of base station 200 that the subscriber equipment of interference is caused in base station 202.
In the central user equipment 400～406 of base station 200 services, select out in nearest a period of time, such as 20ms, used the boundary user device-specific resource of base station 202, and the subscriber equipment of larger interference was caused in base station 202, and established these subscriber equipmenies and constitute set omega.If base station 200 can't be by disturbing the overload indication, or subscriber equipment judges it specifically is which subscriber equipment causes larger interference to base station 202 to the information such as path loss of neighbor cell, then base station 200 was thought in nearest a period of time, such as 20ms, used the central user equipment of the boundary user device-specific resource of base station 202 to constitute set omega.Such as, in Fig. 1, subscriber equipment 400,402 and 406 constitutes user device set Ω.
For user device set Ω, adoptable control strategy has:
Step 660: base station 200 reduces the transmitting power of subscriber equipment among the Ω.Typical method such as: the transmitting power of subscriber equipment among the Ω is descended one by one with step-length α dB, rises the upper limit P of power control value more one by one with step-length α dB when disturbing the overload indication not receiving
MaxWith lower limit P
MinDetermine by the base station.This control strategy is as the formula (3):
Need to prove, because central user equipment is generally little to the contribution of disturbing, so the α of formula (3) generally gets less value, as 0.5dB, 1dB etc.
Step 662: the use resource of subscriber equipment limits among the 200 couples of Ω in base station.Typical method such as: in a period of time after disturbing the overload indication was received in base station 200, such as 20ms, base station 200 did not allow that subscriber equipment uses the boundary user device-specific resource of base station 202 among the Ω.Other central user equipment that this resource will be assigned to base station 200 services use.
Step 664: base station 200 makes that subscriber equipment replaces among the Ω in the resource coordination method, typical method such as: if the long-time interference base station 202 of some central user equipment among the Ω, then boundary user equipment is temporarily replaced into these central user equipment in base station 200, so, these central user equipment are attempted using different resources, avoid the boundary user equipment of base station 202 is formed interference.
Step 666: base station 200 is adjusted and is subjected to the interference threshold value.Typical method reduces η such as: base station 200
I Make base station 200 send the indication of interference overload more continually on the heart user equipment specific resource therein, suppress of the interference of the boundary user equipment of base station 202 or base station 204, thereby part compensates subscriber equipment among the Ω because of being disturbed the decline that suppresses the communication link quality after relevant the control to base station 200.
Step 668: the interference that 200 refusal base stations 202, base station send suppresses indication.Typical method sends anti-jamming by X2 interface 300 to base station 202 such as: base station 200 and suppresses indication, show that base station 200 can't cause excessive interference on the heart user equipment specific resource therein, require base station 202 on its boundary user device-specific resource, to reduce and send the frequency that disturbs the overload indication; Associative operation when simultaneously, base station 200 is not once received and disturb to be suppressed (as power rising α dB etc.).
Need to prove that step 660 to the combination of step 668 also is possible control strategy.At this,, omitted the argumentation that repeats to combined strategy for the clear succinct consideration of style of writing.
Based on multi cell cellular system shown in Figure 1, suppose the cut apart situation of base station 202 according to own resource piece subclass, send to base station 200 by X2 interface 300 and to disturb the overload indication, and indicate that to disturb the Resource Block subclass of overload be the central user device-specific resource (right-hand branch of step 5192) of base station 202.Because base station 200 is adjacent with base station 202, not overlapping between their the boundary user device-specific resource, but between the central user device-specific resource, and it is overlapping to some extent between central user device-specific resource and the boundary user device-specific resource, so, the central user device-specific resource of base station 202 is the boundary user device-specific resource of base station 200 and the union of part central user device-specific resource, so it is the boundary user equipment and the central user equipment of base station 200 that the subscriber equipment of interference is caused in base station 202.
In the central user equipment 400～406 of base station 200 services, select out in nearest a period of time, such as 20ms, used the central user device-specific resource of base station 202, and the subscriber equipment of larger interference was caused in base station 202, and established these subscriber equipmenies and constitute set omega.If base station 200 can't be by disturbing the overload indication, subscriber equipment judges it specifically is which subscriber equipment causes larger interference to base station 202 to the information such as path loss of neighbor cell, then base station 200 was thought in nearest a period of time, such as 20ms, used the central user equipment of the central user device-specific resource of base station 202 to constitute set omega.Such as, in Fig. 1, subscriber equipment 400,402 and 406 constitutes user device set Ω.
In the boundary user equipment 408～414 of base station 200 services, select out in nearest a period of time, such as 20ms, used the central user device-specific resource of base station 202, and the subscriber equipment of larger interference was caused in base station 202, and established these subscriber equipmenies and constitute set Λ.If base station 200 can't be by disturbing the overload indication, subscriber equipment judges it specifically is which subscriber equipment causes larger interference to base station 202 to the information such as path loss of neighbor cell, then base station 200 was thought in nearest a period of time, such as 20ms, used the boundary user equipment of the central user device-specific resource of base station 202 to constitute set Λ.Such as, in Fig. 1, subscriber equipment 408 and 410 constitutes user device set Λ.
For user device set Ω, adoptable control strategy has:
Step 670: base station 200 reduces the transmitting power of subscriber equipment among the Ω.Typical method such as: the transmitting power of subscriber equipment among the Ω is descended one by one with step-length β dB, rises the upper limit P of power control value more one by one with step-length β dB when disturbing the overload indication not receiving
MaxWith lower limit P
MinDetermine by the base station.This control strategy is as the formula (4):
Need to prove, because central user equipment is generally little to the contribution of disturbing, so the β of formula (4) generally gets less value, as 0.5dB, 1dB etc.
Step 672: the use resource of subscriber equipment limits among the 200 couples of Ω in base station.Typical method such as: in a period of time after disturbing the overload indication was received in base station 200, such as 20ms, base station 200 did not allow that subscriber equipment uses the central user device-specific resource of base station 202 among the Ω.Other subscriber equipmenies that this resource will be assigned to base station 200 services use.
Step 674: base station 200 makes that subscriber equipment replaces among the Ω in the resource coordination method, typical method such as: if the long-time interference base station 202 of some central user equipment among the Ω, then boundary user equipment is temporarily replaced into these central user equipment in base station 200, so, these central user equipment are attempted using different resources, avoid the central user equipment of base station 202 is formed interference.
Step 676: the interference that 200 refusal base stations 202, base station send suppresses indication.Typical method sends anti-jamming by X2 interface 300 to base station 202 such as: base station 200 and suppresses indication, show that base station 200 can't cause excessive interference on the heart user equipment specific resource therein, require base station 202 to reduce on the heart user equipment specific resource therein and send the frequency that disturbs the overload indication; Associative operation when simultaneously, base station 200 is not once received and disturb to be suppressed (as power rising β dB etc.).
Need to prove that step 670 to the combination of step 676 also is possible control strategy.At this,, omitted the argumentation that repeats to combined strategy for the clear succinct consideration of style of writing.
For user device set Λ, adoptable control strategy has:
Step 680: base station 200 reduces the transmitting power of subscriber equipment among the Λ.Typical method such as: the transmitting power of subscriber equipment among the Λ is descended one by one with step-length γ dB, rises the upper limit P of power control value more one by one with step-length γ dB when disturbing the overload indication not receiving
MaxWith lower limit P
MinDetermine by the base station.This control strategy is as the formula (5):
Need to prove that because subscriber equipment is the boundary user equipment of base station 200 among the Λ, and boundary user equipment is generally bigger to the contribution of disturbing, so the γ of formula (5) generally gets bigger value, as 3dB, 5dB etc.So, the α in the formula (3), the relation between the γ in β in the formula (4) and the formula (5) can be α≤β≤γ.
Step 682: the use resource of subscriber equipment limits among the 200 couples of Λ in base station.Typical method such as: in a period of time after disturbing the overload indication was received in base station 200, such as 20ms, base station 200 did not allow that subscriber equipment uses the central user device-specific resource of base station 202 among the Λ.Other subscriber equipmenies that this resource will be assigned to base station 200 services use.
Step 684: base station 200 is adjusted and is subjected to the interference threshold value.Typical method reduces η such as: base station 200
E Base station 200 is sent on its boundary user device-specific resource more continually disturb the overload indication, suppress of the interference of the central user equipment of base station 202 or base station 204, thereby part compensates subscriber equipment among the Λ because of being disturbed the decline that suppresses the communication link quality after relevant the control to base station 200.
Step 686: the resource coordination method is adjusted in base station 200.Typical method is shunk its boundary user device-specific resources such as: base station 200, thereby under the prerequisite that does not influence resource coordination mechanism, reduces the outside interference of boundary user equipment in the base station 200.
Need to prove that step 680 to the combination of step 686 also is possible control strategy.At this,, omitted the argumentation that repeats to combined strategy for the clear succinct consideration of style of writing.
Fig. 7 is the schematic block diagram of base station of the method for the above-mentioned reduction presence of intercell interference of application according to the present invention.
With reference to figure 7, base station 200/202/204 according to the present invention comprises: Resource Block subclass partitioning portion 211, be used for 200/202/204 execution resource coordination method in the base station, and be the Resource Block subclass with division of resources; Interference overload indication method determining section 212 is used for 200/202/204 definite interference overload indication method in the base station; Interference threshold is provided with part 213, is used to described resource settings to be subjected to interference threshold; Interference overload indication method operating part 214 is used to carry out the interference overload indication method based on the Resource Block subclass; With subscriber equipment control section 215, when base station 200/202/204 receives the indication of interference overload, according to the character of indication of the overload of the interference in the interference overload indication method determining section 212 determined interference overload indication methods and indication Resource Block subclass thereof, the nearest subscriber equipment of this Resource Block subclass that used is implemented control strategy.Wherein 200/202/204 of each base station links to each other by X2 interface, links to each other by the Uu interface between base station 200/202/204 and subscriber equipment.More specifically, Resource Block subclass partitioning portion 211, interference overload indication method determining section 212 and interference overload indication method operating part 214 link to each other with X2 interface; Subscriber equipment control section 215 links to each other with the Uu interface.
Resource Block subclass partitioning portion 211 becomes some Resource Block subclass to division of resources by described resource coordination method, and is not overlapping between the related resource piece subclass of neighbor cell, or overlapping with coordinated mode.Subscriber equipment control section 215 is according to the jamproof situation of subscriber equipment and/or disturb the situation of other sub-districts, makes subscriber equipment use relevant Resource Block subclass.
When the interference that is subjected to subscriber equipment in the adjacent base station on the resource of base station surpasses certain thresholding, interference overload indication method operating part 214 will send to adjacent base station by the background communication mode and disturb the overload indication, indicate the sign that produces the subscriber equipment of interference in big or small degree that interference transships, transship and the adjacent base station.
Interference threshold is provided with the big or small degree of being disturbed that part 213 causes owing to described division of resources according to described each Resource Block subclass, sets respectively for each Resource Block subclass and is subjected to interference threshold; The perhaps big or small degree of being disturbed according to affiliated resource integral body is for described resource settings is subjected to interference threshold.
Interference overload indication method operating part 214 is according to the situation of cutting apart of adjacent base station resource piece subclass or according to the situation of cutting apart of own resource piece subclass, sends to adjacent base station and disturbs the overload indication; At this moment, can indicate the position that the Resource Block subclass of transshipping takes place to disturb with signaling.
Similarly, the character of Resource Block subclass comprises: use the jamproof situation of the subscriber equipment of the base station of this Resource Block subclass and adjacent base station and described subscriber equipment and/or disturb the situation of other sub-districts.
The control strategy of subscriber equipment control section 215 comprises: the power of the subscriber equipment that reduce to produce disturbs, the resource that produces the subscriber equipment that disturbs used limited, will produce that the interference that subscriber equipment replace, adjacent base station is refused in the base station overload of disturbing is indicated, the base station adjustment is subjected to interference threshold and base station adjustment resource coordination method in the resource coordination method.
So far invention has been described in conjunction with the preferred embodiments.Should be appreciated that those skilled in the art can carry out various other change, replacement and interpolations under the situation that does not break away from the spirit and scope of the present invention.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.
Claims (24)
1. reduce the method for presence of intercell interference in the ascending honeycomb system, utilize resource coordination and disturb overload indication integrated processes, interference is controlled, described method comprises the steps:
Carrying out the resource coordination method between the base station, is the Resource Block subclass with division of resources;
Determine interference overload indication method between the base station;
The base station is that described resource settings is subjected to interference threshold;
The interference overload indication method based on the Resource Block subclass is carried out in the base station;
When the base station receives when disturbing the overload indication, the base station is implemented control strategy according to the character of disturbing overload indication and indication Resource Block subclass thereof to the nearest subscriber equipment of this Resource Block subclass that used.
2. reduce the method for presence of intercell interference in the ascending honeycomb according to claim 1 system, it is characterized in that,, division of resources is become some Resource Block subclass by described resource coordination method, not overlapping between the related resource piece subclass of neighbor cell, or overlapping with coordinated mode; According to the jamproof situation of subscriber equipment and/or disturb the situation of other sub-districts, make subscriber equipment use relevant Resource Block subclass.
3. reduce the method for presence of intercell interference in the ascending honeycomb according to claim 1 system, it is characterized in that, by described interference overload indication method, when the interference that is subjected to subscriber equipment in the adjacent base station on the resource of base station surpasses certain thresholding, the base station will send to adjacent base station by the background communication mode and disturb the overload indication, indicate interference and transship.
4. reduce the method for presence of intercell interference in the ascending honeycomb according to claim 3 system, it is characterized in that, the base station will send to adjacent base station by the background communication mode disturbs overload to indicate, and further indicate the big or small degree of overload.
5. according to the method that reduces presence of intercell interference in claim 3 or the 4 described ascending honeycomb systems, it is characterized in that the base station will send to adjacent base station by the background communication mode and disturb the overload indication, further indicate the sign that produces the subscriber equipment of interference in the adjacent base station.
6. reduce the method for presence of intercell interference in the ascending honeycomb according to claim 1 system, it is characterized in that, the base station utilizes described resource coordination method,, set respectively for each Resource Block subclass and to be subjected to interference threshold because the big or small degree of being disturbed that causes of described division of resources according to described each Resource Block subclass.
7. reduce the method for presence of intercell interference in the ascending honeycomb according to claim 1 system, it is characterized in that the big or small degree that the base station is disturbed according to affiliated resource integral body is for described resource settings is subjected to interference threshold.
8. reduce the method for presence of intercell interference in the ascending honeycomb according to claim 1 system, it is characterized in that, the base station is according to the situation of cutting apart of adjacent base station resource piece subclass, sends to adjacent base station and disturbs the overload indication.
9. reduce the method for presence of intercell interference in the ascending honeycomb according to claim 1 system, it is characterized in that, the base station is according to the situation of cutting apart of own resource piece subclass, sends to adjacent base station and disturbs the overload indication.
10. according to Claim 8 or reduce the method for presence of intercell interference in the 9 described ascending honeycomb systems, it is characterized in that the position of the Resource Block subclass that overload takes place to disturb is further indicated in the base station with signaling.
11. reduce the method for presence of intercell interference in the ascending honeycomb according to claim 1 system, it is characterized in that the character of described Resource Block subclass comprises: use the jamproof situation of the subscriber equipment of the base station of this Resource Block subclass and adjacent base station and described subscriber equipment and/or disturb the situation of other sub-districts.
12. reduce the method for presence of intercell interference in the ascending honeycomb according to claim 1 system, it is characterized in that described control strategy comprises: the power of the subscriber equipment that reduce to produce disturbs, the resource that produces the subscriber equipment that disturbs used limited, will produce that the interference that subscriber equipment replace, adjacent base station is refused in the base station overload of disturbing is indicated, the base station adjustment is subjected to interference threshold and base station adjustment resource coordination method in the resource coordination method.
13. a base station comprises:
Resource Block subclass partitioning portion is used for carrying out the resource coordination method between the base station, is the Resource Block subclass with division of resources;
The interference overload indication method determining section is used for determining interference overload indication method between the base station;
Interference threshold is provided with part, is used to described resource settings to be subjected to interference threshold;
The interference overload indication method operating part is used to carry out the interference overload indication method based on the Resource Block subclass;
The subscriber equipment control section, when the base station receives the indication of interference overload, according to the character of indication of the overload of the interference in the determined interference overload indication method of interference overload indication method determining section and indication Resource Block subclass thereof, the nearest subscriber equipment of this Resource Block subclass that used is implemented control strategy.
14. base station according to claim 13, it is characterized in that described Resource Block subclass partitioning portion becomes some Resource Block subclass to division of resources by described resource coordination method, not overlapping between the related resource piece subclass of neighbor cell, or overlapping with coordinated mode; And described subscriber equipment control section makes subscriber equipment use relevant Resource Block subclass according to the jamproof situation of subscriber equipment and/or disturb the situation of other sub-districts.
15. base station according to claim 13, it is characterized in that, when the interference that is subjected to subscriber equipment in the adjacent base station on the resource of base station surpasses certain thresholding, described interference overload indication method operating part will send to adjacent base station by the background communication mode and disturb the overload indication, indicate interference and transship.
16. base station according to claim 15 is characterized in that, described interference overload indication method operating part will send to adjacent base station by the background communication mode and disturb the overload indication, further indicate the big or small degree of overload.
17., it is characterized in that described interference overload indication method operating part will send to adjacent base station by the background communication mode and disturb the overload indication, further indicate the sign that produces the subscriber equipment that disturbs in the adjacent base station according to claim 15 or 16 described base stations.
18. base station according to claim 13 is characterized in that, described interference threshold is provided with the big or small degree of being disturbed that part causes owing to described division of resources according to described each Resource Block subclass, sets respectively for each Resource Block subclass and is subjected to interference threshold.
19. base station according to claim 13 is characterized in that, described interference threshold is provided with the big or small degree that part is disturbed according to affiliated resource integral body, for described resource settings is subjected to interference threshold.
20. base station according to claim 13 is characterized in that, described interference overload indication method operating part sends the indication of interference overload according to the situation of cutting apart of adjacent base station resource piece subclass to adjacent base station.
21. base station according to claim 13 is characterized in that, described interference overload indication method operating part sends the indication of interference overload according to the situation of cutting apart of own resource piece subclass to adjacent base station.
22., it is characterized in that described interference overload indication method operating part is further indicated the position that the Resource Block subclass of transshipping takes place to disturb with signaling according to claim 20 or 21 described base stations.
23. base station according to claim 13, it is characterized in that the character of described Resource Block subclass comprises: use the jamproof situation of the subscriber equipment of the base station of this Resource Block subclass and adjacent base station and described subscriber equipment and/or disturb the situation of other sub-districts.
24. base station according to claim 13, it is characterized in that the control strategy of described subscriber equipment control section comprises: the power of the subscriber equipment that reduce to produce disturbs, the resource that produces the subscriber equipment that disturbs used limited, will produce that the interference that subscriber equipment replace, adjacent base station is refused in the base station overload of disturbing is indicated, the base station adjustment is subjected to interference threshold and base station adjustment resource coordination method in the resource coordination method.
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