CN101784057A - Method for reducing femtocell interference - Google Patents
Method for reducing femtocell interference Download PDFInfo
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- CN101784057A CN101784057A CN200910076760A CN200910076760A CN101784057A CN 101784057 A CN101784057 A CN 101784057A CN 200910076760 A CN200910076760 A CN 200910076760A CN 200910076760 A CN200910076760 A CN 200910076760A CN 101784057 A CN101784057 A CN 101784057A
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- home enodeb
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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.Described 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 described macro base station is called 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 save 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 (Home eNodeB configuration one still a plurality of carrier waves decide on the mode of operation of Home eNodeB) 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 described 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 by 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 described Home eNodeB in a plurality of carrier waves of macro base station be f+/-Δ f, wherein:
F represents the centered carrier of described 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 the system authorization frequency range that sets in advance.
Preferably, described 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 determined 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, described steps A can for:
Home eNodeB obtains the centered carrier of its affiliated macro base station by the Primary Common Control Physical Channel P-CCPCH of its affiliated macro base station of test.
Preferably, described 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 described 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 described available frequency tabulation, will disturb minimum frequency to be configured to the working frequency points of described Home eNodeB described Home eNodeB.
Further, can comprise the available frequency of macro base station under the described Home eNodeB in the described available frequency tabulation, and described value be f+/-priority of the frequency of Δ f is higher than the available frequency of macro base station under the described Home eNodeB;
Described step B ' can for: after Home eNodeB powers on, according to priority order from high to low, preferential detect described 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 described Home eNodeB to described Home eNodeB.
Further, described steps A ' can comprise: be Home eNodeB configure dedicated scrambler group in advance;
May further include afterwards at described step B ':
C ', Home eNodeB judge under the working frequency points of described Home eNodeB whether have untapped special-purpose scrambler according to described pre-configured special-purpose scrambler group, if exist, then from described untapped special-purpose scrambler, select a working scrambler that is configured to described Home eNodeB, if do not exist, then will disturb minimum special-purpose scrambler to be configured to the working scrambler of described Home eNodeB to described Home eNodeB.
Further, described steps A ' can comprise: dispose the frequency tabulation that grand network uses for Home eNodeB in advance;
May further include afterwards at described step C ':
D ', Home eNodeB detect the signal strength signal intensity of the macro base station scrambler under each frequency in the described 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 sets in advance.
As seen from the above technical solution, the present invention is configured in by 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, can find by the pulse envelope that calculates pulsed filter, the inventive method is increased the frequency isolation degree between a plurality of carrier waves of the working frequency points of Home eNodeB and macro base station greatly, thereby the present invention is under the prerequisite that does not increase frequency resource, increase the frequency isolation degree between a plurality of carrier waves of the working frequency points of Home eNodeB and macro base station greatly, effectively reduced Home eNodeB and the interference between the macro base station under it.
Description of drawings
Fig. 1 reduces the method schematic diagram of the interference of Home eNodeB for the present invention.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
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 the working frequency points of Home eNodeB and macro base station 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 described Home eNodeB in a plurality of carrier waves of macro base station can by formula f+/-Δ f calculates, wherein:
F represents the centered carrier of described 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 the system authorization frequency range that sets in advance.
Described " f+/-Δ f " expression " f+ Δ f " or " f-Δ f ".Guaranteed that by above-mentioned condition " f+/-Δ f be in the system authorization frequency range that sets in advance " working frequency points of the Home eNodeB that 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 described 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 described 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 has begun operate as normal under the working frequency points of described configuration.
Fig. 1 reduces the method schematic diagram 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 and carrier wave 2 are two adjacent carriers of macro base station, and carrier wave 2 and carrier wave 3 also are two adjacent carriers of macro base station.Adopt method provided by the invention, the borderline carrier wave 4 that is in carrier wave 1 and carrier wave 2 can be configured to the working frequency points of Home eNodeB, also the borderline carrier wave 5 that is in carrier wave 2 and carrier wave 3 can 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, 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.By 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.
When specific implementation 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 by detecting the mode that disposes automatically certainly, carries out according to following steps:
The 1st step: Home eNodeB is determined 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 by 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.
Guaranteed that by above-mentioned condition " f+/-Δ f be in the system authorization frequency range that sets in advance " working frequency points of the Home eNodeB that disposed can not exceed the frequency range of system authorization.With Fig. 1 is example, guarantees that exactly the carrier wave of the working frequency points that can be configured to Home eNodeB 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 by setting in advance the mode that disposes automatically, carries out according to following steps:
The 1st step: in advance for Home eNodeB disposes the tabulation of available frequency, comprise value during described 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 described available frequency tabulation, will disturb minimum frequency to be configured to the working frequency points of described Home eNodeB to described Home eNodeB.
In the 1st step of above-mentioned second method, the available frequency that can further comprise macro base station under the described Home eNodeB in the available frequency tabulation of described setting, and described value be f+/-priority of the frequency of Δ f is higher than the available frequency of macro base station under the described Home eNodeB.So, in the 2nd step, after Home eNodeB powers on, can be according to priority order from high to low, preferential detect described 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 described Home eNodeB to described 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 described the 2nd step, further comprise:
The 3rd step: Home eNodeB judges under the working frequency points of described Home eNodeB whether have untapped special-purpose scrambler according to described pre-configured special-purpose scrambler group, if exist, then from described untapped special-purpose scrambler, select a working scrambler that is configured to described Home eNodeB, if do not exist, then will disturb minimum special-purpose scrambler to be configured to the working scrambler of described Home eNodeB to described 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 described 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 described 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 sets 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, described operation is same as the prior art, does not repeat them here.
After adopting above-mentioned two kinds of methods to be Home eNodeB configuration effort frequency, UE can be according to prior art by 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.
As seen from the above-described embodiment, the present invention is configured in by 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, can find by the pulse envelope that calculates pulsed filter, the inventive method is increased the frequency isolation degree between a plurality of carrier waves of the working frequency points of Home eNodeB and macro base station greatly, thereby the present invention is under the prerequisite that does not increase frequency resource, increase the frequency isolation degree between a plurality of carrier waves of the working frequency points of Home eNodeB and macro base station greatly, effectively reduced Home eNodeB and the interference between the macro base station under it.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
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.
2. method according to claim 1 is characterized in that, the border of any two adjacent carriers under the described Home eNodeB in a plurality of carrier waves of macro base station be f+/-Δ f, wherein:
F represents the centered carrier of described 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 the system authorization frequency range that sets in advance.
3. method according to claim 2 is characterized in that, the borderline method that described 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 determined the centered carrier of its affiliated macro base station;
B, Home eNodeB with working frequency points be configured in f+/-Δ f.
4. method according to claim 3 is characterized in that, described steps A is:
Home eNodeB obtains the centered carrier of its affiliated macro base station by the Primary Common Control Physical Channel P-CCPCH of its affiliated macro base station of test.
5. method according to claim 2 is characterized in that, the borderline method that described 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 described 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 described available frequency tabulation, will disturb minimum frequency to be configured to the working frequency points of described Home eNodeB described Home eNodeB.
6. method according to claim 5 is characterized in that:
The available frequency that further comprises macro base station under the described Home eNodeB in the described available frequency tabulation, and described value be f+/-priority of the frequency of Δ f is higher than the available frequency of macro base station under the described Home eNodeB;
Described step B ' is: after Home eNodeB powers on, according to priority order from high to low, preferentially detect described 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 described Home eNodeB to described Home eNodeB.
7. according to claim 5 or 6 described methods, it is characterized in that:
Described steps A ' further comprise: be Home eNodeB configure dedicated scrambler group in advance;
Further comprise afterwards at described step B ':
C ', Home eNodeB judge under the working frequency points of described Home eNodeB whether have untapped special-purpose scrambler according to described pre-configured special-purpose scrambler group, if exist, then from described untapped special-purpose scrambler, select a working scrambler that is configured to described Home eNodeB, if do not exist, then will disturb minimum special-purpose scrambler to be configured to the working scrambler of described Home eNodeB to described Home eNodeB.
8. method according to claim 7 is characterized in that:
Described steps A ' further comprise: dispose the frequency tabulation that grand network uses for Home eNodeB in advance;
Further comprise afterwards at described step C ':
D ', Home eNodeB detect the signal strength signal intensity of the macro base station scrambler under each frequency in the described 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 sets 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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| CN101784057B CN101784057B (en) | 2012-07-04 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101959203A (en) * | 2010-10-11 | 2011-01-26 | 清华大学 | Wireless communication method of LTE (Long Term Evolution) network comprising macro cell base station and home base station |
| CN102378206A (en) * | 2010-08-13 | 2012-03-14 | 华为技术有限公司 | Interference coordination method and system thereof, and apparatus |
| CN102547728A (en) * | 2010-12-09 | 2012-07-04 | 中兴通讯股份有限公司 | Method and device for spatially multiplexing frequency spectrums |
| CN103391627A (en) * | 2012-05-07 | 2013-11-13 | 上海无线通信研究中心 | Downlink interference elimination method based on carrier waves in hybrid network |
| CN106658521A (en) * | 2017-01-13 | 2017-05-10 | 北京交通大学 | Base station spectrum distribution method when heterogeneous cellular network is networked in same frequency |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1176533C (en) * | 2001-05-15 | 2004-11-17 | 华为技术有限公司 | Layering method for CDMA mobile communication system |
| FR2828619B1 (en) * | 2001-08-10 | 2004-01-02 | Radiotelephone Sfr | METHOD AND DEVICE FOR DETERMINING A FREQUENCY PLAN |
-
2009
- 2009-01-19 CN CN200910076760XA patent/CN101784057B/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378206A (en) * | 2010-08-13 | 2012-03-14 | 华为技术有限公司 | Interference coordination method and system thereof, and apparatus |
| CN102378206B (en) * | 2010-08-13 | 2015-06-03 | 华为技术有限公司 | Interference coordination method and system thereof, and apparatus |
| CN101959203A (en) * | 2010-10-11 | 2011-01-26 | 清华大学 | Wireless communication method of LTE (Long Term Evolution) network comprising macro cell base station and home base station |
| 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 |
| CN102547728A (en) * | 2010-12-09 | 2012-07-04 | 中兴通讯股份有限公司 | Method and device for spatially multiplexing frequency spectrums |
| 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 |
| CN103391627A (en) * | 2012-05-07 | 2013-11-13 | 上海无线通信研究中心 | Downlink interference elimination method based on carrier waves in hybrid network |
| 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 |
| CN106658521A (en) * | 2017-01-13 | 2017-05-10 | 北京交通大学 | Base station spectrum distribution method when heterogeneous cellular network is networked in same frequency |
| 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 |
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| CN101784057B (en) | 2012-07-04 |
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