CN101998412B - Frequency resource allocation method, home node B management system (HMS) and Femto eNB - Google Patents
Frequency resource allocation method, home node B management system (HMS) and Femto eNB Download PDFInfo
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Abstract
The invention provides a frequency resource allocation method for a Femto eNB, a home node B management system (HMS) and a Femto eNB. The allocation method comprises the following steps: powering on the Femto eNB to be allocated; searching the adjacent Femto eNB of the Femto eNB to be allocated; acquiring the reference signal receiving power (RSRP) of the adjacent Femto eNB and the service condition of frequency resources; and when the RSRP of the adjacent Femto eNB is more than a preset threshold value, allocating the frequency resources orthometric with the frequency used by the adjacent Femto eNB for the Femto eNB to be allocated. The invention can ensure that the interference between the adjacent Femto eNBs can be reduced.
Description
Technical field
The present invention relates to Femto cell (Femtocell) technical field, particularly be method, Home eNodeB management system (HMS) and the Femto eNB of Femto eNB dividing frequency resource.
Background technology
Femto cell (Femtocell) is also referred to as and flies honeycomb, and Femto eNB is a kind of small-sized, low-power cellular basestation, is mainly used in indoor places such as family and office, therefore is also referred to as Home eNodeB.Its effect is the replenishing of indoor covering, for the user provides speech and data, services as Cellular Networks.Interference problem between the Femto eNB is one of key issue that must solve during for Femto eNB actual allocated frequency resource.
At present, Femtocell is existing to be applicable to various standards such as GSM, UMTS and to support the product of 2G, 2.5G, 3G, and the Femtocell that is applicable to LTE is at present also in standardized process.Also not having at present a kind of is that Femto eNB dividing frequency resource method can solve the interference problem between the adjacent Femto eNB well.
Summary of the invention
The present invention proposes a kind of method of Femto eNB dividing frequency resource that is, can reduce the interference between the adjacent Femto eNB.
The present invention also proposes another kind and is the method for Femto eNB dividing frequency resource, can reduce the interference between the adjacent Femto eNB.
The present invention also proposes a kind of HMS and Femto eNB, can reduce the interference between the adjacent Femto eNB.
Technical scheme of the present invention is achieved in that
A kind of is the method for Femto eNB dividing frequency resource, comprising:
Femto eNB to be allocated powers on, search for the adjacent Femto eNB of described Femto eNB to be allocated, obtain RSRP and the frequency resource operating position of described adjacent Femto eNB, as the RSRP of described adjacent Femto eNB during greater than pre-set threshold, it is the frequency resource that described Femto eNB to be allocated distributes the frequency orthogonal of using with described adjacent Femto eNB.
A kind of is the method for Femto eNB dividing frequency resource, comprising:
When Femto eNB to be allocated judges with the multiplexing same carrier wave of adjacent Femto eNB/subband, whether the SINR that the UE of described Femto eNB to be allocated calculates is greater than first thresholding that sets in advance, if greater than, then send the multiplexing application that comprises described carrier wave/subband sign to described adjacent Femto eNB;
When described adjacent Femto eNB judges with the multiplexing described carrier wave of Femto eNB to be allocated/subband, whether the SINR that the UE of described adjacent Femto eNB calculates is greater than second thresholding that sets in advance, if greater than, then return multiplexing replying to described Femto eNB to be allocated;
According to described multiplexing replying, for described Femto eNB to be allocated distributes described carrier wave/subband.
A kind of is the HMS of Femto eNB dividing frequency resource, comprising: information acquisition module and first resource distribution module; Wherein,
Described information acquisition module is for RSRP and the frequency resource operating position of the Femto eNB that obtains the HMS management;
Described first resource distribution module, be used for after Femto eNB to be allocated powers on, as the RSRP of the adjacent Femto eNB of described FemtoeNB during greater than pre-set threshold, it is the frequency resource that described FemtoeNB to be allocated distributes the frequency orthogonal of using with described adjacent Femto eNB.
A kind of Femto eNB comprises: multiplexing application module and multiplexing responder module; Wherein,
Described multiplexing application module, when be used for judging described Femto eNB and the multiplexing same carrier wave of adjacent Femto eNB/subband, whether the SINR that the UE of described Femto eNB calculates is greater than first thresholding that sets in advance, if greater than, then send the multiplexing application that comprises described carrier wave/subband sign to described adjacent Femto eNB;
Described multiplexing responder module, be used for receiving the multiplexing application that comprises carrier wave/subband sign that adjacent Femto eNB sends, when judging with the multiplexing described carrier wave of described adjacent Femto eNB/subband, whether the SINR that the UE of described Femto eNB calculates is greater than second thresholding that sets in advance, if greater than, then return multiplexing replying to described adjacent Femto eNB.
As fully visible, method, HMS and Femto eNB that the present invention proposes, when being Femto eNB dividing frequency resource to be allocated, at first judge its adjacent Femto eNB RSRP whether greater than pre-set threshold, when greater than the time, illustrate that adjacent Femto eNB may cause interference to Femto eNB to be allocated, therefore use state according to the frequency resource of adjacent Femto eNB, distribute the frequency resource of adjacent Femto eNB quadrature with this for Femto eNB to be allocated.The frequency resource of Fen Peiing can reduce the interference between the adjacent Femto eNB in this way.
Description of drawings
Fig. 1 is the bandwidth mode schematic diagram of 3GPP definition;
The realization flow figure of Fig. 2 embodiment of the invention one;
Fig. 3 is the overall interference figure that HMS sets up in the embodiment of the invention one;
Fig. 4 is the local interference figure that Femto eNB e sets up in the embodiment of the invention one;
Fig. 5 is the realization flow figure of the embodiment of the invention two;
Fig. 6 is the realization flow figure of the embodiment of the invention four;
Fig. 7 is the local interference figure that Femto eNB e sets up in the embodiment of the invention four;
Fig. 8 is the realization flow figure of the embodiment of the invention five;
Fig. 9 is the realization flow figure of the embodiment of the invention six;
Figure 10 is the structural representation of embodiment of the invention HMS;
Figure 11 is the structural representation of embodiment of the invention Femto eNB.
Embodiment
The present invention proposes a kind of for the method for Femto eNB dividing frequency resource.What suppose to distribute for all Femto eNB is the frequency of one section 10MHz bandwidth, and the present invention will be divided into this band frequency several carrier waves, and each Femto eNB can be assigned with one or more carrier waves with different bandwidth.Need consider when carrying out allocation of carriers to avoid or reduce interference between the adjacent Femto eNB as far as possible.The bandwidth mode schematic diagram of 3GPP definition as shown in Figure 1, the partition size of carrier wave can be 1.4MHz, 3MHz, 5MHz or 10MHz, certainly, the present invention does not get rid of other carrier waves that does not meet the bandwidth mode of present 3GPP definition.In addition, the present invention can also be applied to a carrier wave is divided into several subbands (subband), is each Femto eNB allocated subbands.
The present invention is divided into two steps for the process of Femto eNB dividing frequency resource:
Step 1 is distributed all available frequency resources for each Femto eNB carries out quadrature.So-called quadrature distributes, and the adjacent Femto eNB distribution for the mutual interference of possibility phase does not have overlapping frequency resource exactly.When for after being assigned with different frequency resources, just can not produce interference between each adjacent Femto eNB.The frequency resource that distribute this moment is called orthogonal frequency resources.
In order to realize this purpose, at first need to understand and to cause situations such as the adjacent Femto eNB of interference and the already used frequency resource of this adjacent Femto eNB to a Femto eNB, and can set up interference figure according to these situations.
Step 2, determine according to the particular location situation of the subscriber equipment (UE) of Femto service that eNB provides whether each Femto eNB can share all or part of frequency resource with adjacent Femto eNB, disturbing under the situation about allowing, for adjacent Femto eNB distributes common resource.This step is called multiplexing distribution, will be called the channelized frequencies resource for the frequency resource that Femto eNB distributes.
Think that below Femto eNB i distributing carrier wave is example, above-mentioned two steps are lifted specific embodiment respectively describe in detail.
Embodiment one:
Present embodiment is introduced first kind of mode setting up interference figure in the step 1 (being that quadrature distributes).
The event that triggers the quadrature distribution is that Femto eNB i powers on.After Femto eNB i powers on, at first select one or more carrier waves to make and initially to be inserted by the UE of its service; Because Femto eNB this moment do not know by the distribution situation of the UE of its service, so must guarantee that carrier wave by its distribution may be constituted the adjacent Femto eNB that disturbs to it and do not used, therefore the distribution of carrying out this moment is that quadrature distributes.
Referring to Fig. 2, the realization flow figure of Fig. 2 embodiment of the invention one may further comprise the steps:
Step 201:Femto eNB i searches for adjacent Femto eNB (search procedure and UE are similar), determines the sign of adjacent Femto eNB.
Step 202:Femto eNB i measures the Reference Signal Received Power (RSRP) of the adjacent Femto eNB that searches.
Obvious, the RSRP that calculates adjacent Femto eNB is more big, illustrates that then the interference of the Femto eNB of this adjacent Femto eNB i formation will be more big if for Femto eNB i distributes the identical carrier wave of adjacent Femto eNB with this.Therefore, divide timing will avoid distributing the identical carrier wave of adjacent Femto eNB with this into Femto eNB i at quadrature.
The information such as RSRP of the sign of the adjacent Femto eNB that step 203:Femto eNB i will search and the adjacent Femto eNB that measures report Home eNodeB management system (HMS).
Step 204:HMS sends the frequency resource operating position of its adjacent Femto eNB according to the adjacent Femto eNB sign that Femto eNB i provides to Femto eNBi.
Step 205:Femto eNB i sets up interference figure according to the RSRP of adjacent Femto eNB and the frequency resource operating position of adjacent Femto eNB.When the RSRP signal strength signal intensity of Femto eNBj is greater than a certain threshold value near measure, then Femto eNB j may cause interference to Femto eNB i, therefore with FemtoeNBj as a summit on the interference figure of Femto eNB i, the weight of line is RSRP between Femto eNBj and the Femto eNB i.
And HMS can set up the overall interference figure of all Femto eNB of its management according to the frequency resource operating position of RSRP and the adjacent Femto eNB of the adjacent Femto eNB of each Femto eNB of its management.And each Femto eNB only knows himself producing the Femto eNB information of interference, and namely its interference figure is local interference figure.
As shown in Figure 3, Fig. 3 is the overall interference figure that HMS sets up in the embodiment of the invention one.7 Femto eNB that numbering is respectively a, b, c, d, e, f, g have been managed in this HMS condominium, have be numbered 6 carrier waves of 1,2,3,4,5,6 can be for distributing.HMS has distributed carrier wave 1 and carrier wave 2 for a; For b has distributed carrier wave 3; For c has distributed carrier wave 4; For d has distributed carrier wave 5; For f has distributed carrier wave 6; For g has distributed carrier wave 1 and carrier wave 4.After Femto eNB e powered on, HMS set up overall interference figure as shown in Figure 3.
As shown in Figure 4, Fig. 4 is the local interference figure that Femto eNB e sets up in the embodiment of the invention one, is the part of Fig. 3.
Certainly, the above-mentioned interference figure of setting up is a kind of execution mode, it may occur to persons skilled in the art that RSRP and the frequency resource operating position of the adjacent Femto eNB of mode (for example setting up form) record that adopts other, and the present invention does not limit this.
Embodiment two:
Present embodiment is introduced the second way of setting up interference figure in the step 1 (being that quadrature distributes).Referring to Fig. 5, Fig. 5 is the realization flow figure of the embodiment of the invention two, may further comprise the steps:
Step 501:Femto eNB i searches for adjacent Femto eNB, determines the sign of adjacent Femto eNB.
Step 502:Femto eNB i is according to the sign of adjacent Femto eNB, to adjacent Femto eNB transmission frequency resource operating position query requests.
Step 503: adjacent Femto eNB is to the frequency resource operating position of Femto eNB i feedback self.
Step 504:Femto eNB i measures the RSRP of adjacent Femto eNB.
The frequency resource operating position of the adjacent Femto eNB that step 505:Femto eNB i receives according to step 503 and the RSRP of the adjacent Femto eNB that step 504 is measured set up local interference figure, as shown in Figure 4.
Step 506:HMS obtains the RSRP of adjacent Femto eNB of all Femto eNB of its management and the frequency resource operating position of adjacent Femto eNB, can set up the overall interference figure of all Femto eNB of its management, as shown in Figure 3.
Above-described embodiment one and embodiment two have introduced the dual mode of setting up interference figure, afterwards, can distribute orthogonal frequency resources for Femto eNB according to the interference figure of setting up.Following three kinds of modes are specifically arranged:
Embodiment three:
Present embodiment is introduced first kind of mode of distributing quadrature carrier in the step 1 (being that quadrature distributes).Specifically comprise:
According to the interference figure of setting up, for Femto eNB i distributes a plurality of carrier waves, make Femto eNB i and the adjacent Femto eNB that has interference relationships with it use the carrier wave of quadrature.This distribution can be undertaken or be undertaken by Femto eNB is distributed by HMS is centralized.
For example, the interference figure of being set up by Fig. 3 and Fig. 4 as can be seen, may cause the adjacent Femto eNB of interference to comprise a, d and g to Femto eNB e, and the already used carrier wave of a, d and g comprises 1,2,4 and 5, therefore, in order not cause interference, the carrier wave that can distribute for Femto eNB e quadrature is carrier wave 3 and carrier wave 6.
Be numbered all carrier waves of 1～6 if the adjacent Femto eNB of Femto eNB e has used, in this case, Femto eNB e can satisfy the carrier wave of seizing adjacent Femto eNB under the situation about using in the frequency resource of adjacent Femto eNB; Perhaps, can distribute in the interference figure the employed carrier wave (the two multiplexing this carrier wave) with farthest adjacent Femto eNB of its distance (among Fig. 2 farthest be g) for Femto eNB e, like this, though Femto eNB e and the employed carrier wave of Femto eNB g are also non-orthogonal, can make the two mutual interference as far as possible little.
When carrying out allocation of carriers, consider maximum resource utilance, fairness and minimize the modification that existing resource is distributed.
In above-described embodiment three, be disposable finishing for Femto eNB i distributes the process of quadrature carrier, other two kinds that below will introduce are distributed the process of quadrature carrier will divide 2 stages to carry out step by step.
Embodiment four:
Present embodiment is introduced the second way of distributing quadrature carrier in the step 1 (being that quadrature distributes).
In the present embodiment, distribute the process of quadrature carrier to comprise 2 stages, i.e. original allocation stage and shared competitive stage.Wherein, the carrier wave that the original allocation stage distributes is called the first priority carrier wave, can be considered to satisfy the carrier wave of Femto eNB minimum requirements; The carrier wave of sharing the competitive stage distribution is called the second priority carrier wave, is its distribution when Femto eNB needs, and then is recovered in the shared resource pond when not required.Referring to Fig. 6, Fig. 6 is the realization flow figure of the embodiment of the invention four, may further comprise the steps:
Step 610: original allocation stage.
After Femto eNB i powers on, used the state of carrier wave according to adjacent Femto eNB, for Femto eNB i distributes the first priority carrier wave.
Following three kinds of situations may appear in the initial carrier allocation of Femto eNB i:
Situation one:
After Femto eNB i powers on, distribute for it finds a quadrature carrier according to interference figure, this carrier wave is called the first priority carrier wave of Femto eNB i.Still be example with Fig. 3, the first priority carrier wave that distributes for Femto eNB e can be carrier wave 3 or carrier wave 6.
Situation two:
If Femto eNB i can't find a quadrature carrier can supply to distribute, then can find a carrier wave that is not the first priority carrier wave by adjacent Femto eNB use as yet to distribute according to the already used first priority carrier case of the adjacent Femto eNB with each of interference figure.
For example, Fig. 7 is the local interference figure that Femto eNB e sets up in the embodiment of the invention four, and the carrier wave that the adjacent Femto eNB a of Femto eNBe has used is carrier wave 1,2 and 3, and wherein carrier wave 1 is the first priority carrier wave of a; The carrier wave that d has used is carrier wave 5 and 6, and wherein carrier wave 5 is the first priority carrier wave of d; The carrier wave that g has used is carrier wave 1 and 4, and wherein carrier wave 1 is the first priority carrier wave of g.By this interference figure as seen, the adjacent Femto eNB of Femto eNB e has used and has been numbered all carrier waves of 1～6, and Femto eNB e can't find a quadrature carrier can supply to distribute; But the already used first priority carrier wave of adjacent Femto eNB is carrier wave 1 and 5, and therefore, Femto eNB e can choose one wantonly as the first priority carrier wave of self from carrier wave 2,3,4 and 6.
If Femto eNB e selects carrier wave 2 as the first priority carrier wave of oneself, because carrier wave 2 is current by Femto eNB a use, then Femto eNB e can require Femto eNB a to abandon using carrier wave 2, specifically may further comprise the steps:
Femto eNB e reports HMS with carrier wave 2, and reclaims signaling to Femto eNB a transmission frequency, requires Femto eNB a to abandon using carrier wave 2;
Femto eNB a reclaims signaling according to frequency, abandons using carrier wave 2; Femto eNB a will abandon using the adjacent Femto eNB of the advisory self of carrier wave 2;
Be Femto eNB e distributing carrier wave 2, with the first priority carrier wave of carrier wave 2 as self.
Above-mentioned assigning process can be undertaken by Femto eNB interactive mode, also can be undertaken by HMS is centralized.In the process of whole distribution, each Femto eNB can record the also carrier wave operating position of its adjacent Femto eNB of real-time update, and HMS also can record the also carrier wave operating position of all Femto eNB of its management of real-time update, to be used for carrying out allocation of carriers.
Situation three:
If Femto eNB i not only can't find the quadrature carrier can be for distributing, and all carrier waves all to be used by adjacent Femto eNB be the first priority carrier wave, then:
Femto eNB i can abandon inserting; Perhaps,
Selection inserts oneself disturbing minimum carrier wave; Perhaps,
Report HMS.HMS is that Femto eNB i distributes first a priority carrier wave guaranteeing that each Femto eNB has the first priority carrier wave and the allocation of carriers of other Femto eNB is changed under the minimum prerequisite.HMS distributes the change notification message to the reformed Femto eNB of allocation of carriers and adjacent Femto eNB transmission frequency thereof.
Step 610 has been finished original allocation, for each Femto eNB has distributed the first priority carrier wave; Carry out the shared competitive stage of Femto eNB afterwards, i.e. step 620 is for Femto eNB distributes the second priority carrier wave.
Step 620: share the competitive stage.Event that trigger to share competition is: the UE average bandwidth of Femto eNB greater than/less than threshold value.
In above-mentioned steps 620, for after Femto eNB i distributed the first priority carrier wave, if still have the part carrier wave not to be assigned to the first priority carrier wave of any one its adjacent Femto eNB in the system, then this part carrier wave is constituted a shared resource pond.
Because the UE quantity of Femto eNB i active service may change, when the UE of Femto eNB i service increases, the average bandwidth of each UE will diminish (number that the average bandwidth of UE equals carrier bandwidths/UE of Femto eNB i), when the average bandwidth of UE during less than minimum threshold, just need be for FemtoeNB i distributes more carrier wave, to satisfy the demand of UE.Can from the shared resource pond, select this moment one or more allocation of carriers to give Femto eNB i, as the second priority carrier wave of Femto eNB i.
When the UE of Femto eNB i service reduces, the average bandwidth of each UE will become greatly, when the average bandwidth of UE during greater than max-thresholds, the part second priority carrier wave of Femto eNB i can be discharged, put into the shared resource pond, shared for other Femto eNB.
After Femto eNB i shutdown, all carrier waves that this Femto eNB i can be used are regained, and put into the shared resource pond.
In the said process, when the situation of each Femto eNB distributing carrier wave changes, all can notify its adjacent Femto eNB and HMS, each Femto eNB and HMS record and the above-mentioned information of real-time update in the system.
Embodiment five:
Present embodiment is introduced the third mode of distributing quadrature carrier in the step 1 (being that quadrature distributes).In the present embodiment, distribute the process of quadrature carrier to comprise 2 stages, i.e. original allocation stage and monopolizing the competitive stage.Wherein, the carrier wave that the original allocation stage distributes is called the first priority carrier wave, can be considered to satisfy the carrier wave of Femto eNB minimum requirements; The carrier wave of monopolizing the competitive stage distribution is called the second priority carrier wave, when a Femto eNB needs more resources, can apply for monopolizing the second priority carrier wave of its adjacent FemtoeNB.Referring to Fig. 8, Fig. 8 is the realization flow figure of the embodiment of the invention five, may further comprise the steps:
Step 810: original allocation stage.This step is identical with step 610, repeats no more.
Step 820: monopolize the competitive stage.The event that competition is monopolized in triggering is: the UE average bandwidth of Femto eNB is less than the total bandwidth of minimum threshold or the Femto eNB total bandwidth much smaller than adjacent Femto eNB.Specifically comprise step 821～step 825.
Whether step 821:Femto eNB i judges the UE average bandwidth of self less than minimum threshold, if less than, then execution in step 822; Perhaps, whether the total bandwidth that Femto eNB i judges self is much smaller than the total bandwidth of adjacent Femto eNB, if then execution in step 822.
Step 822:Femto eNB i sends to adjacent Femto eNB and monopolizes application, and this is monopolized and applies for comprising the UE average bandwidth of Femto eNB i and the carrier identification that request is monopolized.
Step 823: adjacent Femto eNB calculates the UE average bandwidth of self, judges whether much larger than the UE average bandwidth of monopolizing the Femto eNB i that comprises in the application, if then execution in step 824; Otherwise, execution in step 825.Because the not stationarity of UE quantity, the UE average bandwidth that calculates may change to some extent, for fear of the destabilizing factor of therefore bringing, can repeatedly repeat in a period of time to judge, and when repeatedly judgement all meets the demands, execution in step 824.We will be called only use answer delay during this period of time.
Step 824: adjacent Femto eNB monopolizes to Femto eNB i feedback and replys, and discharges the carrier wave that described FemtoeNB i request is monopolized, and Femto eNB i monopolizes this carrier wave.Finish current flow process.
Step 825: adjacent Femto eNB monopolizes refusal to Femto eNB i feedback.
It is worthy of note that the mode of two kinds of distribution quadrature carriers that embodiment four and embodiment five introduce can be used simultaneously, the two does not conflict.Such as, after certain Femto eNB has distributed the first priority carrier wave in the original allocation stage, if the UE average bandwidth of this Femto eNB is less than minimum threshold, can share competition earlier, namely search and whether have carrier wave in the shared resource pond, if exist, then be the second priority carrier wave of this Femto eNB with this allocation of carriers; If there is no, then monopolize competition, namely monopolize application satisfying under the prerequisite of trigger condition to send to adjacent Femto eNB, the carrier wave that this adjacent Femto eNB is using is monopolized in application.
Embodiment six:
Present embodiment is introduced step 2 (being multiplexing distribution).Different with the quadrature distribution of first step, multiplexing distribution is under the condition that the Signal to Interference plus Noise Ratio of the UE that Femto eNB serves (SINR) can meet the demands, and suitably is that a plurality of adjacent Femto eNB distribute identical carrier waves; The frequency that carries out multiplexing distribution is more frequent, and generally is by the distributed realization of each Femto eNB.
For the needs of subsequent descriptions, at first introduce the SINR of UE, the SINR of UE adopts following formula to calculate:
Wherein, RSRP
Serving, RSRP
Non-servingMeasure by UE with N;
RSRP
ServingBe the RSRP for the Femto eNB i of this UE service;
RSRP
Non-servingBe the RSRP that has used the adjacent Femto eNB of same carrier wave with Femto eNB i;
N is noise power.
By above-mentioned formula (1) as can be seen, if be the multiplexing already used carrier wave of Femto eNBj that distributed of Femto eNB i, then Femto eNBj can cause interference for the UE of Femto eNB i, and the SINR that the UE of FemtoeNB i calculates will reduce; When the SINR that calculates as UE is too small, illustrate that Femto eNB i can't normally provide service for this UE.Therefore, before Femto eNB i applies for multiplexing a certain carrier wave, if this carrier wave that needs at first to have judged multiplexing, whether the SINR that the UE that himself serves calculates can accept, when the SINR that calculates as all or part of UE can accept, FemtoeNB i sends multiplexing application to the adjacent Femto eNB that uses this carrier wave, otherwise does not just have multiplexing necessity.Here, needs all or the SINR of part UE can accept and need the SINR of much a part of UE to accept, and relates to the policing issue in the practical application, and the present invention does not limit this.
Accordingly, if the multiplexing already used carrier wave of Femto eNBj that distributed of Femto eNB i, Femto eNB i also can cause interference for the UE of Femto eNBj, and the SINR that makes the UE of Femto eNBj calculate reduces.Therefore, Femto eNBj is before agreeing the multiplexing a certain carrier wave of Femto eNB i, if also needed to judge this carrier wave multiplexing, whether the SINR that the UE that himself serves calculates can accept, when the SINR that calculates as all or part of UE can accept, Femto eNBj sends multiplexing replying to Femto eNB i, otherwise does not just provide multiplexing.
Think that below Femto eNB i carries out the multiplexing example that is assigned as and is introduced, referring to Fig. 9, Fig. 9 is the realization flow figure of the embodiment of the invention six, may further comprise the steps:
Step 901: initial decision.
The traffic carrying capacity of judging Femto eNB i needs, and when traffic needs is big, illustrates that Femto eNBi needs bigger bandwidth, need therefore to judge whether application to use more carrier wave, execution in step 902; Less when traffic carrying capacity, when carrying out voice communication as the UE of Femto eNB i, because lower to the demand of bandwidth, therefore need not apply for new carrier wave, then finish current flow process.
Initial decision can be thought the trigger mechanism of multiplexing distribution.Generally speaking, UE carries out the possibility that moves the position when carrying out voice communication bigger, so this trigger mechanism can be avoided effectively owing to the UE that the carries out voice communication frequency that causes that moves around is distributed frequent variations.Certainly, the initial decision of step 901 is not steps necessary, direct execution in step 902 yet.
Step 902: multiplexing application.
Multiplexing application refers to a certain carrier wave of the common use of request and adjacent Femto eNB.
According to above-mentioned formula (1), if among the Femto eNB i all or part UE calculate its use the carrier wave that adjacent Femto eNB using after SINR can accept, then using the adjacent Femto eNB of this carrier wave to send to all please in multiplexing.The content of multiplexing application comprises: the carrier identification that Femto eNB i request is multiplexing.
Step 903: multiplexing replying.
Multiplexing replying refers to agree and a certain carrier wave of the common use of adjacent Femto eNB.
After Femto eNBj receives the multiplexing application of Femto eNB i transmission, according to above-mentioned formula (1), SINR still can accept behind the multiplexing a certain carrier wave of Femto eNB i if all or part UE of Femto eNBj calculates, then send multiplexing replying to Femto eNB i, agree to use jointly with adjacent Femto eNBi the carrier wave of its request; Otherwise transmission rejection signaling.
Because the mobility of UE, its SINR that calculates can change to some extent because of the mobility of UE, for fear of the destabilizing factor of therefore bringing, UE can be in a period of time double counting SINR repeatedly, when having only the SINR that during this period of time calculates to continue to accept, Femto eNBj just sends multiplexing replying to FemtoeNB i, and we will be called multiplexing answer delay during this period of time.
Step 904: carrier wave multiplexing.
Receive multiplexing the replying of all Femto eNBj transmissions as Femto eNB i after, use to Femto eNB i the multiplexing allocation of carriers of request.
Step 905: the recovery of carrier wave.
Through above-mentioned steps 903 and step 904, multiplexing certain quadrature carrier that distributes Femto eNBj of Femto eNB i, when the UE of Femto eNBj distribution situation or UE member changed, the SINR that UE calculates may change.When the SINR that calculates according to above-mentioned formula (1) as all or part of UE of Femto eNBj is unacceptable, then send recovery command to Femto eNB i, require to reclaim this carrier wave of Femto eNBj; Recovery command comprises the carrier identification that requirement is reclaimed.
After Femto eNB i receives this recovery command, abandon using this quadrature carrier of Femto eNBj.
Similar with the multiplexing answer delay in the step 903, for fear of destabilizing factor, UE can be in a period of time double counting SINR repeatedly, when having only the SINR that during this period of time calculates lasting unacceptable, Femto eNBj just sends recovery command to Femto eNB i, and we will be called use during this period of time and reclaim time delay.
Above-mentioned six embodiment have introduced the different implementations in each stage of frequency resource allocation respectively.Wherein, it is distribution of overall importance that quadrature distributes, and powers on or the UE average bandwidth of Femto eNB triggers during less than minimum threshold at Femto eNB, and it is lower to carry out the frequency that quadrature distributes.Multiplexing assigning process can be by the HMS centralized control, also can be by the distributed realization of each Femto eNB.Multiplexing distribution is effectively controlled the interference problem between adjacent Femto eNB.
Multiplexing distribution can be regarded the adjustment of locality as, under the situation that UE position and the state of Femto eNB changes, when the SINR after the UE of Femto eNB calculates the frequency of multiplexing adjacent Femto eNB can accept, triggers multiplexing distribution.Multiplexing distribution can need not to report HMS by the distributed realization of Femto eNB, makes frequency resource to be utilized flexibly and effectively.
It is emphasized that above-mentioned quadrature distributes and multiplexing distribution is two associated steps each other, is respectively again two independent frequency resource allocation methods; The multiplexing distribution method introduced of embodiment six and do not rely on the quadrature distribution method that the embodiment of the invention one to five is introduced particularly, the mode that adopts other is after adjacent Femto eNB has distributed orthogonal frequency resources, still can adopt embodiment six described modes that adjacent Femto eNB is carried out multiplexing distribution.
In addition, above-described embodiment is that example describes to give Femto eNB distributing carrier wave all, the present invention also is applicable to the situation of each allocation of subbands of a carrier wave being given Femto eNB, and the concrete method of salary distribution is identical with the mode of distributing carrier wave in above-described embodiment, repeats no more.
The present invention also proposes a kind of for the HMS of Femto eNB dividing frequency resource, and referring to Figure 10, Figure 10 is the structural representation of embodiment of the invention HMS, comprising: information acquisition module 1001 and first resource distribution module 1002; Wherein,
Information acquisition module 1001 is for RSRP and the frequency resource operating position of the Femto eNB that obtains the HMS management;
First resource distribution module 1002, be used for after Femto eNB to be allocated powers on, as the RSRP of the adjacent Femto eNB of described FemtoeNB during greater than pre-set threshold, it is the frequency resource that described FemtoeNB to be allocated distributes the frequency orthogonal of using with described adjacent Femto eNB.
Above-mentioned first resource distribution module 1002 is used for distributing first priority carrier wave/subband of the frequency orthogonal of using with adjacent Femto eNB for Femto eNB to be allocated after Femto eNB to be allocated powers on.
Above-mentioned HMS may further include second resource distribution module 1003, being used at the UE of described Femto eNB to be allocated average bandwidth during less than minimum threshold, is that described Femto eNB to be allocated distributes second priority carrier wave/subband of the frequency orthogonal of using with adjacent Femto eNB;
Also be used at the UE of described Femto eNB to be allocated average bandwidth discharging second priority carrier wave/subband of described Femto eNB to be allocated during greater than max-thresholds.
Above-mentioned HMS may further include information resources distribution module 1004, be used at the UE of described Femto eNB to be allocated average bandwidth less than the UE average bandwidth of minimum threshold and adjacent Femto eNB during much larger than the UE average bandwidth of Femto eNB to be allocated, discharge carrier wave/subband that described adjacent Femto eNB uses, give Femto eNB to be allocated with described carrier wave/allocation of subbands.
The embodiment of the invention also proposes a kind of Femto eNB, and referring to Figure 11, Figure 11 is the structural representation of embodiment of the invention Femto eNB, comprising: multiplexing application module 1101 and multiplexing responder module 1102; Wherein,
Multiplexing application module 1101, when be used for judging described Femto eNB and the multiplexing same carrier wave of adjacent Femto eNB/subband, whether the SINR that the UE of described Femto eNB calculates is greater than first thresholding that sets in advance, if greater than, then send the multiplexing application that comprises described carrier wave/subband sign to described adjacent Femto eNB;
Multiplexing responder module 1102, be used for receiving the multiplexing application that comprises carrier wave/subband sign that adjacent Femto eNB sends, when judging with the multiplexing described carrier wave of described adjacent Femto eNB/subband, whether the SINR that the UE of described Femto eNB calculates is greater than second thresholding that sets in advance, if greater than, then return multiplexing replying to described adjacent Femto eNB.
Above-mentioned Femto eNB can also comprise: multiplexing recycling module 1103, be used for judging that whether SINR that the UE of Femto eNB calculates is less than the 3rd thresholding that sets in advance, if less than, then send the recovery command that comprises carrier wave/subband sign to adjacent FemtoeNB.
As fully visible, the present invention proposes can be divided into 2 steps for the scheme of Femto eNB dividing frequency resource, i.e. quadrature distribution and multiplexing distribution, and these two steps are respectively schemes independently.Be that Femto eNB to be allocated is when distributing orthogonal frequency resources, at first judge its adjacent Femto eNB RSRP whether greater than pre-set threshold, when greater than the time, illustrate that adjacent Femto eNB may cause interference to FemtoeNB to be allocated, therefore use state according to the frequency resource of adjacent Femto eNB, distribute the frequency resource of adjacent Femto eNB quadrature with this for FemtoeNB to be allocated.The frequency resource of Fen Peiing can reduce the interference between the adjacent Femto eNB in this way.Be that Femto eNB to be allocated distributes the channelized frequencies resource, the SINR situation that calculates according to Femto eNB, judgement can with adjacent Femto eNB multiplexing part frequency resource, the dividing frequency resource can improve the utilance of frequency resource in this way, and frequency resource is effectively utilized flexibly.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (17)
1. one kind is the method for femto base station Femto eNB dividing frequency resource, it is characterized in that described method comprises:
Femto eNB to be allocated powers on, search for the adjacent Femto eNB of described Femto eNB to be allocated, obtain Reference Signal Received Power RSRP and the frequency resource operating position of described adjacent Femto eNB, as the RSRP of described adjacent Femto eNB during greater than pre-set threshold, it is first priority carrier wave/subband that described Femto eNB to be allocated distributes the frequency orthogonal of using with described adjacent Femto eNB;
Whether judge the UE average bandwidth of Femto eNB to be allocated less than minimum threshold, if less than, then be that described Femto eNB to be allocated distributes second priority carrier wave/subband of the frequency orthogonal of using with adjacent Femto eNB;
Whether judge the UE average bandwidth of Femto eNB to be allocated greater than max-thresholds, if greater than, second priority carrier wave/subband of described Femto eNB to be allocated then discharged.
2. method according to claim 1 is characterized in that, the described mode of obtaining adjacent Femto eNB frequency resource operating position is:
Described Femto eNB to be allocated is sent to Home eNodeB management system HMS with the sign of adjacent Femto eNB;
HMS is according to described sign, and the frequency resource operating position of adjacent Femto eNB is sent to described Femto eNB to be allocated.
3. method according to claim 1 is characterized in that, the described mode of obtaining adjacent Femto eNB frequency resource operating position is:
Described Femto eNB to be allocated is according to the sign of adjacent Femto eNB, to described adjacent Femto eNB transmission frequency resource operating position query requests;
Described adjacent Femto eNB is to the frequency resource operating position of Femto eNB feedback to be allocated self.
4. want 1,2 or 3 described methods according to right, it is characterized in that, described method further comprises:
When Femto eNB to be allocated judges with the multiplexing same carrier wave of adjacent Femto eNB/subband, whether the Signal to Interference plus Noise Ratio SINR that the UE of described Femto eNB to be allocated calculates is greater than first thresholding that sets in advance, if greater than, then send the multiplexing application that comprises described carrier wave/subband sign to described adjacent Femto eNB;
When described adjacent Femto eNB judges with the multiplexing described carrier wave of Femto eNB to be allocated/subband, whether the SINR that the UE of described adjacent Femto eNB calculates is greater than second thresholding that sets in advance, if greater than, then return multiplexing replying to described Femto eNB to be allocated;
According to described multiplexing replying, be the described carrier wave/subband of the described multiplexing distribution of Femto eNB to be allocated.
5. method according to claim 4, it is characterized in that, whether the SINR that the described UE that judges Femto eNB to be allocated calculates greater than first thresholding is: judge in the predefined time period whether described SINR continues greater than first thresholding, if judge that then described SINR is greater than first thresholding;
Whether the SINR that the described UE that judges adjacent Femto eNB calculates greater than second thresholding is: judge in the predefined time period whether described SINR continues greater than second thresholding, if judge that then described SINR is greater than second thresholding.
6. method according to claim 4 is characterized in that, further comprises after the described distribution:
Whether judge SINR that the UE of adjacent Femto eNB calculates less than the 3rd thresholding that sets in advance, if less than, then adjacent Femto eNB sends the recovery command that comprises carrier wave/subband sign to Femto eNB to be allocated;
According to described recovery command, described Femto eNB to be allocated abandons using described adjacent Femto eNB to require the carrier wave/subband that reclaims.
7. method according to claim 6, it is characterized in that, whether the SINR that the described UE that judges adjacent Femto eNB calculates less than the 3rd thresholding is: judge in the predefined time period whether described SINR continues less than the 3rd thresholding, if judge that then described SINR is less than the 3rd thresholding.
8. one kind is the method for femto base station Femto eNB dividing frequency resource, it is characterized in that described method comprises:
Femto eNB to be allocated powers on, search for the adjacent Femto eNB of described Femto eNB to be allocated, obtain Reference Signal Received Power RSRP and the frequency resource operating position of described adjacent Femto eNB, as the RSRP of described adjacent Femto eNB during greater than pre-set threshold, it is first priority carrier wave/subband that described Femto eNB to be allocated distributes the frequency orthogonal of using with described adjacent Femto eNB;
Whether judge the UE average bandwidth of Femto eNB to be allocated less than minimum threshold, if less than, then send to adjacent Femto eNB and monopolize application, described application the UE average bandwidth that comprises Femto eNB to be allocated and the carrier wave of the asking to monopolize/subband sign of monopolizing; Perhaps, whether the total bandwidth of judging Femto eNB to be allocated is much smaller than the total bandwidth of adjacent Femto eNB, if much smaller than, then send to adjacent Femto eNB and monopolize application, described application the UE average bandwidth that comprises Femto eNB to be allocated and the carrier wave of the asking to monopolize/subband sign of monopolizing.
9. method according to claim 8 is characterized in that, described transmission further comprises after monopolizing application:
Adjacent Femto eNB calculates the UE average bandwidth of self, judge whether the UE average bandwidth of monopolizing the Femto eNB to be allocated that comprises in the application much larger than described, if, then monopolize to described Femto eNB feedback to be allocated and reply, discharge carrier wave/subband that described Femto eNB request is monopolized;
For described Femto eNB to be allocated distributes described carrier wave/subband.
10. method according to claim 8 is characterized in that, the described mode of obtaining adjacent Femto eNB frequency resource operating position is:
Described Femto eNB to be allocated is sent to Home eNodeB management system HMS with the sign of adjacent Femto eNB;
HMS is according to described sign, and the frequency resource operating position of adjacent Femto eNB is sent to described Femto eNB to be allocated.
11. method according to claim 8 is characterized in that, the described mode of obtaining adjacent Femto eNB frequency resource operating position is:
Described Femto eNB to be allocated is according to the sign of adjacent Femto eNB, to described adjacent Femto eNB transmission frequency resource operating position query requests;
Described adjacent Femto eNB is to the frequency resource operating position of Femto eNB feedback to be allocated self.
12. want 8 to 11 any described methods according to right, it is characterized in that described method further comprises:
When Femto eNB to be allocated judges with the multiplexing same carrier wave of adjacent Femto eNB/subband, whether the Signal to Interference plus Noise Ratio SINR that the UE of described Femto eNB to be allocated calculates is greater than first thresholding that sets in advance, if greater than, then send the multiplexing application that comprises described carrier wave/subband sign to described adjacent Femto eNB;
When described adjacent Femto eNB judges with the multiplexing described carrier wave of Femto eNB to be allocated/subband, whether the SINR that the UE of described adjacent Femto eNB calculates is greater than second thresholding that sets in advance, if greater than, then return multiplexing replying to described Femto eNB to be allocated;
According to described multiplexing replying, be the described carrier wave/subband of the described multiplexing distribution of Femto eNB to be allocated.
13. method according to claim 12, it is characterized in that, whether the SINR that the described UE that judges Femto eNB to be allocated calculates greater than first thresholding is: judge in the predefined time period whether described SINR continues greater than first thresholding, if judge that then described SINR is greater than first thresholding;
Whether the SINR that the described UE that judges adjacent Femto eNB calculates greater than second thresholding is: judge in the predefined time period whether described SINR continues greater than second thresholding, if judge that then described SINR is greater than second thresholding.
14. method according to claim 12 is characterized in that, further comprises after the described distribution:
Whether judge SINR that the UE of adjacent Femto eNB calculates less than the 3rd thresholding that sets in advance, if less than, then adjacent Femto eNB sends the recovery command that comprises carrier wave/subband sign to Femto eNB to be allocated;
According to described recovery command, described Femto eNB to be allocated abandons using described adjacent Femto eNB to require the carrier wave/subband that reclaims.
15. method according to claim 14, it is characterized in that, whether the SINR that the described UE that judges adjacent Femto eNB calculates less than the 3rd thresholding is: judge in the predefined time period whether described SINR continues less than the 3rd thresholding, if judge that then described SINR is less than the 3rd thresholding.
16. one kind is the HMS of Femto eNB dividing frequency resource, it is characterized in that described HMS comprises: information acquisition module, first resource distribution module and second resource distribution module; Wherein,
Described information acquisition module is for RSRP and the frequency resource operating position of the Femto eNB that obtains the HMS management;
Described first resource distribution module, be used for after Femto eNB to be allocated powers on, as the RSRP of the adjacent Femto eNB of described Femto eNB during greater than pre-set threshold, it is first priority carrier wave/subband that described Femto eNB to be allocated distributes the frequency orthogonal of using with described adjacent Femto eNB;
Described second resource distribution module, being used at the UE of described Femto eNB to be allocated average bandwidth during less than minimum threshold, is that described Femto eNB to be allocated distributes second priority carrier wave/subband of the frequency orthogonal of using with adjacent Femto eNB; Also be used at the UE of described Femto eNB to be allocated average bandwidth discharging second priority carrier wave/subband of described Femto eNB to be allocated during greater than max-thresholds.
17. one kind is the HMS of Femto eNB dividing frequency resource, it is characterized in that described HMS comprises: information acquisition module, first resource distribution module and information resources distribution module; Wherein,
Described information acquisition module is for RSRP and the frequency resource operating position of the Femto eNB that obtains the HMS management;
Described first resource distribution module, be used for after Femto eNB to be allocated powers on, as the RSRP of the adjacent Femto eNB of described FemtoeNB during greater than pre-set threshold, it is first priority carrier wave/subband that described FemtoeNB to be allocated distributes the frequency orthogonal of using with described adjacent Femto eNB;
Described information resources distribution module, be used at the UE of described Femto eNB to be allocated average bandwidth less than the UE average bandwidth of minimum threshold and adjacent Femto eNB during much larger than the UE average bandwidth of Femto eNB to be allocated, discharge carrier wave/subband that described adjacent Femto eNB uses, give Femto eNB to be allocated with described carrier wave/allocation of subbands.
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| JP5756564B2 (en) | 2011-05-04 | 2015-07-29 | エンパイア テクノロジー ディベロップメント エルエルシー | Method for distributed interference coordination in femtocell environment |
| CN103096432B (en) * | 2011-11-04 | 2015-12-09 | 中国移动通信集团江苏有限公司 | The frequency self-learning method of Home eNodeB and Home eNodeB |
| CN102497671B (en) * | 2011-12-02 | 2014-08-06 | 北京邮电大学 | Interference-adaptive frequency distribution method for femtocells and femtocell |
| CN102638803B (en) * | 2012-03-26 | 2018-08-21 | 北京邮电大学 | Distributed disturbance coordination method between a kind of Home eNodeB based on carrier wave polymerization |
| WO2013152488A1 (en) * | 2012-04-12 | 2013-10-17 | Renesas Mobile Corporation | Apparatuses, methods and computer program product for improvement of time domain based enhanced inter-cell interference coordination solution in heterogeneous networks |
| US9048982B2 (en) | 2012-08-02 | 2015-06-02 | Empire Technology Development Llc | Method for distributed interference coordination in a femtocell environment |
| CN104469785B (en) * | 2013-09-23 | 2019-03-12 | 中国移动通信集团公司 | The method, system and device of collaboration communication between a kind of micro- station |
| CN103813347B (en) * | 2014-02-28 | 2018-01-26 | 电信科学技术研究院 | A kind of base station frequency resource allocation method and the network equipment |
| CN104918331B (en) * | 2015-06-08 | 2019-02-26 | 大唐移动通信设备有限公司 | A kind of frequency resource allocation method and device |
| CN106550368B (en) * | 2015-09-21 | 2020-07-07 | 海能达通信股份有限公司 | Resource allocation method and related equipment |
| WO2017206071A1 (en) | 2016-05-31 | 2017-12-07 | 华为技术有限公司 | Air interface resource allocation method and network device |
| CN108235440B (en) * | 2018-03-20 | 2020-11-06 | 山东大学 | Spectrum resource allocation method and system based on interference threshold in Femtocell network |
| CN112055362B (en) * | 2020-08-19 | 2023-04-07 | 中通服咨询设计研究院有限公司 | 4G and 5G cooperative dynamic frequency sharing method and system |
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