CN101784057B - Method for reducing femtocell interference - Google Patents
Method for reducing femtocell interference Download PDFInfo
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- CN101784057B CN101784057B CN200910076760XA CN200910076760A CN101784057B CN 101784057 B CN101784057 B CN 101784057B CN 200910076760X A CN200910076760X A CN 200910076760XA CN 200910076760 A CN200910076760 A CN 200910076760A CN 101784057 B CN101784057 B CN 101784057B
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- home enodeb
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- scrambler
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Abstract
The invention discloses a method for reducing femtocell interference, which is characterized in that the working frequency point of the femtocell is configured onto the boundary of any two adjacent carrier waves in various carrier waves of an Acer station to which the femtocell belongs. The invention can greatly increase frequency isolation among the multiple carier waves of the working frequency point of the femtocell and the Acer station and effectively reduces interference between the femtocell and the Acer station to which the femtocell belongs.
Description
Technical field
The present invention relates to TD SDMA and insert (TD-SCDMA) technology, particularly a kind of method that reduces the interference of Home eNodeB.
Background technology
Along with TD-SCDMA development at home, the user is more and more urgent in the demand that indoor (family or office) carries out high-speed data service.In this case, the development of Home eNodeB (Home NodeB) and utilization seem particularly important.Home eNodeB is primarily aimed at domestic consumer and small business, and it can effectively solve indoor covering problems such as 3G system applies frequency range height, penetration capacity difference, and plays the effect of the covering blind spot (it is blind to be called for short benefit) of filling up macro base station.In addition, Home eNodeB can improve the capacity of domestic consumer's data service, and cheap rate are provided.
Though Home eNodeB has all advantages of above-mentioned indoor covering, yet Home eNodeB can produce the influence of disturbing and being interfered inevitably as a kind of wireless device.Said interference mainly shows as Home eNodeB and the interference between the macro base station under it.As previously mentioned, Home eNodeB is primarily aimed among a small circle to be used, and the scope that it covered belongs within the coverage of a certain macro base station usually, below said macro base station is called the macro base station under this Home eNodeB.Home eNodeB and the main cause that existence is disturbed between macro base station under it are: be to practice thrift frequency resource; Macro base station adopts the mode of identical networking usually under Home eNodeB and its, that is: the working frequency points of Home eNodeB is configured to equal the one or more carrier waves (one of Home eNodeB configuration still a plurality of carrier waves is looked the mode of operation of Home eNodeB and decided) in a plurality of carrier waves of macro base station under it usually.After having disposed the work frequency for Home eNodeB, Home eNodeB is just worked under said working frequency points.
The existing method that reduces the interference of Home eNodeB has: methods such as the maximum transmission power of adaptively modifying Home eNodeB or employing inter-frequency networking.Wherein, the maximum transmission power of adaptively modifying Home eNodeB need come the adaptively modifying transmitting power through measuring the interference that self produces by Home eNodeB, and this method difficulty is bigger.Adopt the method for inter-frequency networking to waste valuable frequency resource, a kind of method that neither be best under the frequency resource condition of limited.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method that reduces the interference of Home eNodeB, to reduce Home eNodeB and the interference between the macro base station under it.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of method that reduces the interference of Home eNodeB comprises:
The working frequency points of Home eNodeB is configured on the border of any two adjacent carriers in a plurality of carrier waves of macro base station under it.
Preferably, the border of any two adjacent carriers under the said Home eNodeB in a plurality of carrier waves of macro base station be f+/-Δ f, wherein:
F representes the centered carrier of said macro base station;
Δ f=band system band width/2+ band system band width * N;
N is a natural number;
F+/-Δ f is in advance in the system authorization frequency range that is provided with.
Preferably, said working frequency points with the Home eNodeB borderline method that is configured in any two adjacent carriers in a plurality of carrier waves of macro base station under it can comprise:
A, Home eNodeB are confirmed the centered carrier of its affiliated macro base station;
B, Home eNodeB with working frequency points be configured in f+/-Δ f.
In the technique scheme, said steps A can for:
Home eNodeB obtains the centered carrier of its affiliated macro base station through the Primary Common Control Physical Channel P-CCPCH of its affiliated macro base station of test.
Preferably, said working frequency points with the Home eNodeB borderline method that is configured in any two adjacent carriers in a plurality of carrier waves of macro base station under it can comprise:
A ', in advance for Home eNodeB disposes the tabulation of available frequency, comprise value in the said available frequency tabulation and be f+/-frequency of Δ f;
After B ', Home eNodeB power on, detect the signal strength signal intensity of the frequency in the said available frequency tabulation, will disturb minimum frequency to be configured to the working frequency points of said Home eNodeB said Home eNodeB.
Further, can comprise the available frequency of macro base station under the said Home eNodeB in the said available frequency tabulation, and said value be f+/-priority of the frequency of Δ f is higher than the available frequency of macro base station under the said Home eNodeB;
Said step B ' can for: after Home eNodeB powers on; According to priority order from high to low; Preferential detect said value be f+/-signal strength signal intensity of the frequency of Δ f, will disturb minimum frequency be configured to the working frequency points of said Home eNodeB to said Home eNodeB.
Further, said steps A ' can comprise: be Home eNodeB configure dedicated scrambler group in advance;
May further include afterwards at said step B ':
C ', Home eNodeB judge under the working frequency points of said Home eNodeB whether have untapped special-purpose scrambler according to said pre-configured special-purpose scrambler group; If exist; Then from said untapped special-purpose scrambler, select a working scrambler that is configured to said Home eNodeB; If do not exist, then will disturb minimum special-purpose scrambler to be configured to the working scrambler of said Home eNodeB to said Home eNodeB.
Further, said steps A ' can comprise: dispose the frequency tabulation that grand network uses for Home eNodeB in advance;
May further include afterwards at said step C ':
D ', Home eNodeB detect the signal strength signal intensity of the macro base station scrambler under each frequency in the said grand network frequency tabulation, signal strength signal intensity are configured to the grand network adjacent area of this family base station greater than the macro base station of the thresholding that is provided with in advance.
Visible by technique scheme; The present invention is configured in through the working frequency points with Home eNodeB on the border of any two adjacent carriers in a plurality of carrier waves of macro base station under it; On the one hand, the inventive method is only used the frequency resource in the existing system mandate frequency range, need not to increase frequency resource; On the other hand; Pulse envelope through calculating pulsed filter can be found; The inventive method makes the frequency isolation degree between a plurality of carrier waves of working frequency points and macro base station of Home eNodeB be able to increase greatly; Thereby the present invention has increased the frequency isolation degree between a plurality of carrier waves of working frequency points and macro base station of Home eNodeB greatly under the prerequisite that does not increase frequency resource, effectively reduced Home eNodeB and the interference between the macro base station under it.
Description of drawings
Fig. 1 reduces the method sketch map of the interference of Home eNodeB for the present invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is done further explain.
Main thought of the present invention is to utilize the multicarrier characteristic of system; The working frequency points of Home eNodeB is configured on the border of any two adjacent carriers in a plurality of carrier waves of macro base station under it; Thereby under the prerequisite that does not increase frequency resource; Increase the frequency isolation degree between a plurality of carrier waves of working frequency points and macro base station of Home eNodeB greatly, effectively reduced Home eNodeB and the interference between the macro base station under it.
Particularly, the border of any two adjacent carriers under the said Home eNodeB in a plurality of carrier waves of macro base station can through formula f+/-Δ f calculates, wherein:
F representes the centered carrier of said macro base station;
Δ f=band system band width/2+ band system band width * N;
N is a natural number;
F+/-Δ f is in advance in the system authorization frequency range that is provided with.
Said " f+/-Δ f " expression " f+ Δ f " or " f-Δ f ".The working frequency points of the Home eNodeB that has guaranteed through above-mentioned condition " f+/-Δ f be in advance in the system authorization frequency range that is provided with " to be disposed can not exceed the frequency range of system authorization.
According to formula f+/-the possibility of result that Δ f calculates has a plurality of; If Home eNodeB is a single-carrier system; Then from said a plurality of results, select arbitrarily one to be configured to working frequency points and to get final product; If Home eNodeB is multicarrier system, then can be from said a plurality of results selector of the whole family a plurality of frequencies of needing of base station, front yard be configured to the working frequency points of Home eNodeB.After having disposed the work frequency for Home eNodeB, Home eNodeB just can continue follow-up processing flow according to prior art, and under the working frequency points of said configuration, has begun operate as normal.
Fig. 1 reduces the method sketch map of the interference of Home eNodeB for the present invention.In the example shown in Figure 1, carrier wave 1, carrier wave 2 and carrier wave 3 are 3 carrier waves of macro base station under the Home eNodeB, and wherein: carrier wave 1 is two adjacent carriers of macro base station with carrier wave 2, and carrier wave 2 also is two adjacent carriers of macro base station with carrier wave 3.Adopt method provided by the invention, can the borderline carrier wave 4 that be in carrier wave 1 and carrier wave 2 be configured to the working frequency points of Home eNodeB, also can the borderline carrier wave 5 that be in carrier wave 2 and carrier wave 3 be configured to the working frequency points of Home eNodeB.
Be example with the TD-SCDMA system below, the beneficial effect that adopts method shown in Figure 1 to carry out the working frequency points configuration is described.The transmitted pulse forming filter of TD-SCDMA adopts rolloff-factor
Root raised cosine filter (RRC), the impulse response RC of pulsed filter
0(t) be:
(1) in the formula, rolloff-factor
Tc is the length of chip.
(1) formula of employing is calculated the pulse envelope of the pulsed filter under the frequency configuration situation shown in Figure 1; Can obtain: the frequency isolation degree between carrier wave 1 and the carrier wave 4 is 330kHz; Frequency isolation degree between carrier wave 2 and the carrier wave 4 is 330kHz; Frequency isolation degree between carrier wave 2 and the carrier wave 5 is 330kHz, and the frequency isolation degree between carrier wave 5 and the carrier wave 3 is 330kHz, that is to say: the frequency isolation degree between the carrier wave of macro base station and the carrier wave of Home eNodeB is at least 330kHz.
Suppose the 45dB that decays to of carrier wave, can calculate the interference reduction between the Home eNodeB and macro base station under the configuration shown in Figure 1 according to (2) as follows formula:
45-10(log10(1280/330))＝39dB (2)
(2) in the formula, 1280 is the effective bandwidth of TD-SCDMA system in this example.Through method provided by the invention, make Home eNodeB in the above-mentioned example and under it isolation between macro base station increased 39dB, and employed frequency resource does not increase.
Concrete when realizing the method for the invention, whether possess the ability that detects the frequency configuring condition of macro base station around it according to Home eNodeB, provide following two kinds of preferred methods to realize the present invention in the embodiment of the invention.
First method:
In this method, suppose that Home eNodeB possesses its ability of the frequency configuring condition of macro base station on every side that detects.In this case, the present invention adopts Home eNodeB through detecting the mode that disposes automatically certainly, carries out according to following steps:
The 1st step: Home eNodeB is confirmed the centered carrier of its affiliated macro base station.
As previously mentioned, Home eNodeB possesses the ability that detects the frequency configuring condition of macro base station around it, and therefore, Home eNodeB can be through the Primary Common Control Physical Channel (P-CCPCH) of test macro base station under it, obtain the centered carrier of macro base station under it.
The 2nd the step: Home eNodeB with working frequency points be configured in f+/-Δ f.
The working frequency points of the Home eNodeB that has guaranteed through above-mentioned condition " f+/-Δ f be in advance in the system authorization frequency range that is provided with " to be disposed can not exceed the frequency range of system authorization.With Fig. 1 is example, and the carrier wave of the working frequency points that can be configured to Home eNodeB that guarantees exactly to be calculated is not less than carrier wave 1 and is not more than carrier wave 3.
Adopt above-mentioned first method, can reduce the self-configuring number of times that adopts from detecting the Home eNodeB that carries out the working frequency points configuration.
Second method:
In this method, suppose that Home eNodeB does not possess its ability of the frequency configuring condition of macro base station on every side that detects.In this case, the present invention adopts Home eNodeB through the mode that disposes automatically is set in advance, carries out according to following steps:
The 1st step: in advance for Home eNodeB disposes the tabulation of available frequency, comprise value during said available frequency is tabulated and be f+/-frequency of Δ f.
The 2nd step: after Home eNodeB powers on, detect the signal strength signal intensity of the frequency in the said available frequency tabulation, will disturb minimum frequency to be configured to the working frequency points of said Home eNodeB to said Home eNodeB.
In the 1st step of above-mentioned second method; The available frequency that can further comprise macro base station under the said Home eNodeB in the available frequency tabulation of said setting, and said value be f+/-priority of the frequency of Δ f is higher than the available frequency of macro base station under the said Home eNodeB.So; In the 2nd step, after Home eNodeB powers on, can be according to priority order from high to low; Preferential detect said value be f+/-signal strength signal intensity of the frequency of Δ f, will disturb minimum frequency be configured to the working frequency points of said Home eNodeB to said Home eNodeB.
On the basis of above-mentioned second method, can further be Home eNodeB configure dedicated scrambler group in advance in the 1st step;
And after said the 2nd step, further comprise:
The 3rd step: Home eNodeB judges under the working frequency points of said Home eNodeB whether have untapped special-purpose scrambler according to said pre-configured special-purpose scrambler group; If exist; Then from said untapped special-purpose scrambler, select a working scrambler that is configured to said Home eNodeB; If do not exist, then will disturb minimum special-purpose scrambler to be configured to the working scrambler of said Home eNodeB to said Home eNodeB.
On the basis of above-mentioned second method, can further dispose the frequency tabulation that grand network uses for Home eNodeB in advance in the 1st step;
And after said the 3rd step, further comprise:
The 4th step: Home eNodeB detects the signal strength signal intensity of the macro base station scrambler under each frequency in the said grand network frequency tabulation, signal strength signal intensity is configured to the grand network adjacent area of this family base station greater than the macro base station of the thresholding that is provided with in advance.
Above-mentioned the 4th step is after having disposed work frequency and scrambler for Home eNodeB, and for Home eNodeB disposes the operation of grand network adjacent area, said operation is identical with prior art, repeats no more at this.
After adopting above-mentioned two kinds of methods to be Home eNodeB configuration effort frequency, UE can be according to prior art through button or additive method access to family base station.Detailed process is: UE detects the working frequency points of Home eNodeB, the Automatic Frequency of UE switch to above-mentioned f+/-Δ f.
Visible by the foregoing description; The present invention is configured in through the working frequency points with Home eNodeB on the border of any two adjacent carriers in a plurality of carrier waves of macro base station under it; On the one hand, the inventive method is only used the frequency resource in the existing system mandate frequency range, need not to increase frequency resource; On the other hand; Pulse envelope through calculating pulsed filter can be found; The inventive method makes the frequency isolation degree between a plurality of carrier waves of working frequency points and macro base station of Home eNodeB be able to increase greatly; Thereby the present invention has increased the frequency isolation degree between a plurality of carrier waves of working frequency points and macro base station of Home eNodeB greatly under the prerequisite that does not increase frequency resource, effectively reduced Home eNodeB and the interference between the macro base station under it.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.All any modifications of within spirit of the present invention and principle, being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a method that reduces the interference of Home eNodeB is characterized in that, comprising:
The working frequency points of Home eNodeB is configured on the border of any two adjacent carriers in a plurality of carrier waves of macro base station under it;
The border of any two adjacent carriers under the said Home eNodeB in a plurality of carrier waves of macro base station be f+/-Δ f, wherein:
F representes the centered carrier of said macro base station;
Δ f=band system band width/2+ band system band width * N;
N is a natural number;
F+/-Δ f is in advance in the system authorization frequency range that is provided with.
2. method according to claim 1 is characterized in that, the borderline method that said working frequency points with Home eNodeB is configured in any two adjacent carriers in a plurality of carrier waves of macro base station under it comprises:
A, Home eNodeB are confirmed the centered carrier of its affiliated macro base station;
B, Home eNodeB with working frequency points be configured in f+/-Δ f.
3. method according to claim 2 is characterized in that, said steps A is:
Home eNodeB obtains the centered carrier of its affiliated macro base station through the Primary Common Control Physical Channel P-CCPCH of its affiliated macro base station of test.
4. method according to claim 1 is characterized in that, the borderline method that said working frequency points with Home eNodeB is configured in any two adjacent carriers in a plurality of carrier waves of macro base station under it comprises:
A ', in advance for Home eNodeB disposes the tabulation of available frequency, comprise value in the said available frequency tabulation and be f+/-frequency of Δ f;
After B ', Home eNodeB power on, detect the signal strength signal intensity of the frequency in the said available frequency tabulation, will disturb minimum frequency to be configured to the working frequency points of said Home eNodeB said Home eNodeB.
5. method according to claim 4 is characterized in that:
The available frequency that further comprises macro base station under the said Home eNodeB in the said available frequency tabulation, and said value be f+/-priority of the frequency of Δ f is higher than the available frequency of macro base station under the said Home eNodeB;
Said step B ' is: after Home eNodeB powers on, according to priority order from high to low, preferentially detect said value and be f+/-signal strength signal intensity of the frequency of Δ f, will disturb minimum frequency be configured to the working frequency points of said Home eNodeB to said Home eNodeB.
6. according to claim 4 or 5 described methods, it is characterized in that:
Said steps A ' further comprise: be Home eNodeB configure dedicated scrambler group in advance;
Further comprise afterwards at said step B ':
C ', Home eNodeB judge under the working frequency points of said Home eNodeB whether have untapped special-purpose scrambler according to said pre-configured special-purpose scrambler group; If exist; Then from said untapped special-purpose scrambler, select a working scrambler that is configured to said Home eNodeB; If do not exist, then will disturb minimum special-purpose scrambler to be configured to the working scrambler of said Home eNodeB to said Home eNodeB.
7. method according to claim 6 is characterized in that:
Said steps A further comprises: dispose the frequency tabulation that grand network uses for Home eNodeB in advance;
Further comprise afterwards at said step C ':
D ', Home eNodeB detect the signal strength signal intensity of the macro base station scrambler under each frequency in the said grand network frequency tabulation, signal strength signal intensity are configured to the grand network adjacent area of this family base station greater than the macro base station of the thresholding that is provided with in advance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910076760XA CN101784057B (en) | 2009-01-19 | 2009-01-19 | Method for reducing femtocell interference |
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| CN200910076760XA CN101784057B (en) | 2009-01-19 | 2009-01-19 | Method for reducing femtocell interference |
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| CN101784057A CN101784057A (en) | 2010-07-21 |
| CN101784057B true CN101784057B (en) | 2012-07-04 |
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| CN200910076760XA Expired - Fee Related CN101784057B (en) | 2009-01-19 | 2009-01-19 | Method for reducing femtocell interference |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102378206B (en) * | 2010-08-13 | 2015-06-03 | 华为技术有限公司 | Interference coordination method and system thereof, and apparatus |
| CN101959203B (en) * | 2010-10-11 | 2012-10-24 | 清华大学 | Wireless communication method of LTE (Long Term Evolution) network comprising macro cell base station and home base station |
| CN102547728B (en) * | 2010-12-09 | 2016-04-13 | 中兴通讯股份有限公司 | The method of spatial reuse frequency spectrum and device |
| CN103391627B (en) * | 2012-05-07 | 2018-01-02 | 上海无线通信研究中心 | Downlink interference elimination method based on carrier wave in hybrid network |
| CN106658521B (en) * | 2017-01-13 | 2020-07-28 | 北京交通大学 | Base station frequency spectrum distribution method during same-frequency networking of heterogeneous cellular network |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385977A (en) * | 2001-05-15 | 2002-12-18 | 华为技术有限公司 | Layering method for CDMA mobile communication system |
| CN1418026A (en) * | 2001-08-10 | 2003-05-14 | 法国无线电话公司 | Method and equipment to determine frequency plan |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385977A (en) * | 2001-05-15 | 2002-12-18 | 华为技术有限公司 | Layering method for CDMA mobile communication system |
| CN1418026A (en) * | 2001-08-10 | 2003-05-14 | 法国无线电话公司 | Method and equipment to determine frequency plan |
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