CN102137480B - Method and system for adjusting downlink power of Femtocell base station - Google Patents
Method and system for adjusting downlink power of Femtocell base station Download PDFInfo
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Abstract
The invention discloses a method and a system for adjusting downlink power of a Femtocell base station. After the Femtocell base station is started, the Femtocell base station enters a monitoring status; the Femtocell base station selects an unused allowed frequency, or a frequency point with least interference as a working frequency of the Femtocell base station; and the Femtocell base station determines the downlink power of the Femtocell base station according to the working frequency. The transmission power is automatically adjusted according to a network status in order to reduce the interference among different Femtocell base stations and inside a Femtocell system.
Description
Technical field
The present invention relates to 3G communication technical field, particularly a kind of control method and system of Femtocell base station down power.
Background technology
Along with 3G mobile communication system is perfect gradually in the construction of each main Mobile Communications Market of the whole world, the number of users of mobile communication is rapid growth constantly, various applied business based on mobile communication system are also more and more abundanter simultaneously, ever-increasing data service is explosive growth to the requirement of mobile broadband service, and then more and more higher to the requirement of mobile communication system bandwidth.On the other hand, because the rapid growth of mobile communication causes utilizing frequency range more and more higher, the penetration capacity of wireless signal, diffracting power more and more a little less than, it is conflicting that this and most data service occur in indoor environment, traditional utilize mode that outdoor high-power base station covers more and more higher to solving the indoor data service cost that becomes gradually on a large scale, and can not meet the high power capacity demand of data service.
In order to meet the mobile broadband requirement of this rapid growth, mobile communication technology constantly adopts the more adjustment mode of high-order, wider wireless bandwidth, Combined Treatment during more complicated multi-antenna space, yet the finiteness of frequency resource determined the efficient multiplexing of frequency and be only the key addressing this problem, Pico cell (Femtocell) communication system is exactly therefore to propose.Femtocell system adopts low power Femtocell base station to solve indoor covering among a small circle and the requirement of most of mobile broadband data service, use traditional powerful macrocell base stations (Macrocell) to meet outdoor wide area covers and relatively less broadband data service demand simultaneously, so just can greatly alleviate the requirement of ever-increasing mobile communication volume, covering, and saved the networking cost of operator, reduced the high investment risk of operation.Femtocell base station power is little, low in energy consumption in addition, relatively utilizes outdoor wireless signal to cover the way energy-conserving and environment-protective more of indoor environment.Thereby the concept of Femtocell is along with the construction of the grand net of 3G tradition is substantially improved and received increasing concern, according to authoritative advisory organization iSuppli, up-to-date report is pointed out, the shipment amount of estimating Femtocell product in this year, by rising to 1,900,000 from 57.1 ten thousand in 2009, increases more than 2 times.Within 2011, will be the Key Years increasing substantially, shipment amount will reach 7,200,000, compared with 2010, will increase by 289%.No matter still global in China, Femtocell shows the positive signal of scale commercialization, by the end of so far, comprises that AT & T, Waduven and CHINAUNICOM have started comprehensive commercialization.
But, the extensive use of Femtocell communication system need to solve non-existent new technical barrier in some macrocellular mobile communication system, as realized with cheap price the Network Synchronization of reliability, the ability need to plug and play, automatic network-building, how to reduce the interference of grand network mobile communication system and Femtocell system, and the interference between Femtocell internal system different base station etc.
In view of this, need to provide a kind of regulates transmitting power to reduce between different system and the technology of disturbing in Femtocell system according to network condition automatically.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of control method and system of Femtocell base station down power, to solve the emerging technical barrier of Femtocell communication system of the prior art: as realized with cheap price the Network Synchronization of reliability, the ability need to plug and play, automatic network-building, how to reduce the interference of grand network mobile communication system and Femtocell system, and the problems such as interference between Femtocell internal system different base station.
In order to achieve the above object, the present invention has taked following technical scheme:
A control method for Femtocell base station down power, wherein, comprising:
After the start of Femtocell base station, enter listening state;
The base station selected frequency that there is no the permission of use of Femtocell, or disturb minimum frequency as the operating frequency of oneself;
The descending power of oneself is determined in Femtocell base station.
The control method of described Femtocell base station down power, wherein, also comprise: when normally work in Femtocell base station, detect at any time the interference strength of own place frequency, dynamically adjust the maximum transmission power of oneself, to realize dynamic optimum descending power configuration.
The control method of described Femtocell base station down power, wherein, described Femtocell base station up ISCP when without business estimates interference strength and then adjusts base station down power.
The control method of described Femtocell base station down power, wherein, described Femtocell base station is estimated co-channel interference intensity and then is adjusted Femtocell base station down power according to intercepting adjacent area descending pilot frequency intensity.
A regulating system for Femtocell base station down power, wherein, comprising:
Monitoring unit, for detection of the base station signal in all frequencies that allow, knows which frequency used around, and the interference power intensity in all frequencies of utilization;
Frequency selected cell, for the frequency of the permission selecting not have to use, or disturbs minimum frequency as the operating frequency of described Femtocell base station;
Power control unit, for according to disturbing the interference strength of minimum frequency or not having the frequency of the permission of use to determine the maximum transmission power of oneself.
The regulating system of described Femtocell base station down power, wherein, also comprises:
Realtime power adjustment unit, for when normally work in Femtocell base station, detects the interference strength of place frequency at any time, dynamically adjusts the maximum transmission power of Femtocell base station.
The regulating system of described Femtocell base station down power, wherein, described realtime power adjustment unit further comprises:
The first dynamic adjustment unit, estimates interference strength and then adjusts Femtocell base station down power for up ISCP when without business.
The regulating system of described Femtocell base station down power, wherein, described realtime power adjustment unit further comprises:
The second dynamic adjustment unit, for estimating co-channel interference intensity and then adjust Femtocell base station down power according to intercepting adjacent area descending pilot frequency intensity.
Control method and the system of Femtocell base station down power provided by the invention, after the start of Femtocell base station, enter listening state, then, the base station selected frequency that there is no the permission of use of Femtocell, or disturb minimum frequency as the operating frequency of oneself, according to described operating frequency, the descending power of oneself is determined in Femtocell base station.It regulates transmitting power to disturb to reduce between different Femtocell base station and in Femtocell system according to network condition automatically.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of different communication path, interference path in Femtocell system.
Fig. 2 is the flow chart that while utilizing without business, uplink interference state indication ISCP adjusts descending power.
Fig. 3 utilizes descending adjacent area DwPTS intercepted result to adjust the schematic flow sheet of Femtocell base station down power.
Fig. 4 utilizes above-mentioned two kinds of power to adjust the schematic diagram of the effect of mode.
Fig. 5 is that the above-mentioned two kinds of power of comprehensive utilization are adjusted tactful schematic flow sheet.
Embodiment
The construction of traditional wireless mobile communication network needs the detailed network planning, the siting of station, base station radio signal drive test and setting parameter optimization etc., but Femtocell communication system is as a part for mobile communication system, it is installed but without any need for professional training, direct plug and play, this just needs the automatic majorization function of Femtocell base station radio system, if self-optimization function imperfection, unreliable, will cause serious interference to mobile communication system, cause the Femtocell base station of new clothes not only can not work orderly, also can cause the interference to the grand net of tradition and other Femtocell, can not work even completely.The interference level of the mobile communication system of frequency efficient multiplexing has determined the capacity of effective coverage and system completely, so be one of key factor of Femtocell system applies by the resource Automatic Optimal of frequency, power.
The control method of the Femtocell descending power that the present invention proposes and the part that system belongs to Femtocell base station self-optimization function, can realize the dynamic-configuration of Femtocell transmitting power thereby reduce between Femtocell base station and with the interference of grand net base station.
Any radio communication base station has a maximum transmission power capabilities, after the network planning and optimizing, according to coverage requirement, set after maximum transmission power, the emission maximum ability of base station determines, the actual emission power of base station down (being descending power) is according to the power of all activated channel, to control final result to decide.Yet for Femtocell, there is no the network planning and artificial optimization, the emission maximum ability of Femtocell base station is directly easy to cause the interference between different Femtocell base station and to grand net signal as its maximum transmission power and fixing public channel power so.
When the present invention proposes the start of initial Femtocell base station, first in the state of intercepting, detect the base station signal in all frequencies of communication system (such as TD-SCDMA system) that allow around, know which frequency used, and the interference power intensity in all frequencies of utilization.Then the base station selected frequency that there is no the permission used of Femtocell, or disturb minimum frequency as oneself operating frequency, and also the while is determined the maximum transmission power of oneself according to the interference strength of this frequency.Duplex during due to TDD() reciprocity of system transceiver channel, we can think that the interference base station receiving equals the path loss that transmits signals to the other side's interfered base station of main Femtocell base station to the path loss of main Femtocell base station, thereby according to interference strength, determine that the basic principle oneself of transmitting power is unconspicuous or suitable to the interference of the strong jamming base station detecting.
When normally work in Femtocell base station, still can detect at any time the interference strength of own place frequency, when finding to disturb obviously enhancing, can also dynamically adjust the maximum transmission power of oneself, to realize dynamic optimum descending power configuration.The way of two kinds of current frequency interference strengths of judgement that the present invention proposes is as follows:
One, it is the non-linearity due to receive path according to the fundamental measurement amount Interference Signal Code Power (ISCP) of 3GPP, likely the normal upward signal of the terminal of Femtocell inside (UE) user also can cause increasing of the ISCP that measures, so using, when ISCP preferably requires there is no business in the Femtocell of oneself during as co-channel interference basis for estimation, carry out, such ISCP causes with uplink interference frequently.This judgment mode is by uplink interference intensity, to judge the disturbance regime of system, and its process is simple, and easily realizes.
Two, the intensity that judges co-channel interference according to the mode intercepted due to TD-SCDMA system gross power set after descending pilot frequency DwPTS time slot be to take constant power emission to use as UE provides synchronous and Cell searching, we can stop the DwPTS of transmitting oneself during DwPTS, utilize the intensity of monitoring during this period of time with the DwPTS of other base station of frequency, and judge the intensity of co-channel interference with this, and adjust the maximum transmission power of oneself according to the intensity of co-channel interference.This mode is by descending interference strength, to judge that the disturbance regime of system, its benefit are can carry out when having business without business.
By the explanation of above-mentioned two kinds of modes, we can also realize the combination (certainly, also can use separately) of two kinds of modes, come together to judge the disturbance regime of system up-downgoing.The mode of all intercepting with DwPTS while having business without business judges, just utilizes ISCP to judge while there is no business, and the static state that the former realizes Femtocell base station covers setting, and the latter dynamically adjusts the coverage of base station according to service condition.When serious interference, Femtocell is the own maximum transmission power of oneself that suitably reduces just, when not disturbing or when interference is very little, suitably improves the maximum transmission power of oneself and realizes better covering and higher power system capacity.
For making object of the present invention, technical scheme and effect clearer, clear and definite, referring to accompanying drawing examples, the present invention is described in more detail.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to Fig. 1, Fig. 1 is the schematic diagram of different communication path, interference path in Femtocell system (comprising a plurality of Femtocell base station).Fig. 1 shows two Femtocell base stations 100 and 101, and 3 user terminal UE 110,111,112, and wherein UE 110 and 111 is connected to below base station 100, and UE 112 is connected to below base station 101.According to traditional power control strategy, the descending power of base station 100 by UE 110,111 eat dishes without rice or wine connect 120 and 121 and dynamically control, the descending power of base station 101 by UE 112 eat dishes without rice or wine connect 122 and dynamically control.And the downlink power control mode proposing according to the present invention, the descending power of base station 100 is dynamically controlled by wireless connections 120,121 not only, and the control of the signal 131,140 of also being eated dishes without rice or wine realizes more fully interference assessment and dynamic power control.In like manner, the descending power of base station 101 is except 122 dynamically controlling by eating dishes without rice or wine, 130,132,140 the dynamic control of simultaneously also being eated dishes without rice or wine.That is to say that the downlink power control of base station, except the downlink power control in this community, also considered the disturbance regime of minizone.
Please continue to refer to Fig. 2, Fig. 2 shows according to Femtocell base station according to disturb new digit power without the up ISCP(Interference on of business Signal Code Power) the dynamic control flow of descending power while doing interference assessment amount.The setting of initial power is according to initially the interference strength of the frequency of selecting according to wish after the intercepted result of peripheral cell being set.Wherein thresholding 1 represents to utilize ISCP to estimate to disturb the threshold value of adjusting power at present, the threshold value of upper adjusting power when thresholding 2 represents to utilize ISCP to estimate to disturb.For fear of the impact of bursty interference, no matter raise or time adjusting power all will be done multi-frame mean to measuring amount, adjust up and down continually avoiding.In figure, Y(YES) represent it is N(NO) to represent no.
Fig. 3 shows according to the dynamic control flow of descending power when frequently base station down DwPTS intensity is interference assessment amount around.The setting of initial power is according to initially the interference strength of the frequency of selecting according to wish after the intercepted result of peripheral cell being set.Wherein P represents the detected value of main Femtocell base station to common frequency community downlink DwPTS, it is the interference assessment amount threshold value of adjusting power at present that thresholding 3 represents to utilize with base station down DwPTS intensity frequently, and thresholding 4 represents to utilize the threshold value of upper adjusting power when base station down DwPTS intensity is for interference assessment amount frequently.Equally, for fear of the impact of bursty interference, no matter raise or time adjusting power all will be done multi-frame mean to measuring amount, adjust up and down continually avoiding.In figure, Y(YES) represent it is N(NO) to represent no.
Fig. 4 shows the design sketch that above-mentioned two kinds of descending powers are dynamically controlled.402,403 represent respectively Femtocell base station 100 and 101 according to DwPTS the result of each self-adjusting descending power during as co-channel interference strength metric, each will regulate according to the other side's descending DwPTS dynamic changes of strength oneself downstream signal intensity and coverage to that is to say two base stations, thereby reach, cover degree of joining complimentary to one another, thereby reach the object that reduces system interference.402 and 403 oneself static coverages that can be understood as that two Femtocell base stations set according to DwPTS interference strength.In Femtocell base station 101, there is business, and when its upward signal has disturbed base station 100, Femtocell base station 100 will oneself reduce descending power (because now there is no business in base station 100), and, to reduce by two impacts between system, the covering of Femtocell base station 100 has just become 400 from 402; When the business of 101 inside, base station stops, the covering of base station 100 can become 402 from 400 again.In like manner 101 inside, base station do not have business and 100 inside, base station when having business and having disturbed base station 101, and the covering of base station 101 will become 401 from 403, and when the business of 100 communities, base station stops, the covering of base station 101 can return to 403 from 401 again.The coverage of the Femtocell base station that phase mutual energy affects each other will dynamically expand or dwindle to reach according to business and disturbance regime and not only reduces between system co-channel interference but also can meet the requirement covering as far as possible.
Fig. 5 shows the schematic flow sheet (please in the lump in conjunction with Fig. 2 and Fig. 3) that two kinds of Interference Estimation strategies in comprehensive utilization Fig. 2, Fig. 3 come together to control Femtocell base station down power.Wherein the step in empty frame 500 relies on the existence of business whether to determine whether execution.Utilize like this with the disturbance regime of the descending DwPTS of frequency and realize the static coverage of each base station of Femtocell, and utilize uplink interference state to realize the dynamic adjustment of each base station range.In figure, Y(YES) represent it is N(NO) to represent no.
That, although be next illustrational with the frame structure of TD-SCDMA in the embodiment of the present invention, this thinking is equally applicable to all TDD Femtocell systems with being to be understood that.
The present invention also provides a kind of regulating system of Femtocell base station down power, wherein, comprising:
Monitoring unit, for detection of the base station signal in all frequencies that allow, knows which frequency used (obtaining frequency range service condition) around, and the interference power intensity in all use frequency ranges; Frequency selected cell, for the frequency of the permission selecting not have to use, or disturbs minimum frequency as the operating frequency of described Femtocell base station; Power control unit, for according to disturbing the interference strength of minimum frequency or not having the frequency of the permission of use to determine the maximum transmission power of oneself.
Further, the regulating system of described Femtocell base station down power, also comprises realtime power adjustment unit, for when normally work in Femtocell base station, detect at any time the interference strength of place frequency, dynamically adjust the maximum transmission power of Femtocell base station.Described realtime power adjustment unit further comprises: the first dynamic adjustment unit and/or the second dynamic adjustment unit.Wherein, the described first dynamic adjustment unit is estimated interference strength and then is adjusted Femtocell base station down power for up ISCP when without business; The second dynamic adjustment unit is for estimating co-channel interference intensity and then adjust Femtocell base station down power according to intercepting adjacent area descending pilot frequency intensity.
Control method and the system of Femtocell base station down power provided by the invention, after the start of Femtocell base station, enter listening state, then, the base station selected frequency that there is no the permission of use of Femtocell, or disturb minimum frequency as the operating frequency of oneself, according to described operating frequency, the descending power of oneself is determined in Femtocell base station.It regulates transmitting power to disturb to reduce between different Femtocell base station and in Femtocell system according to network condition automatically.
Be understandable that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (2)
1. a control method for Femtocell base station down power, is characterized in that, comprising:
After the start of Femtocell base station, enter listening state;
The base station selected frequency that there is no the permission of use of Femtocell, or disturb minimum frequency as the operating frequency of oneself;
The descending power of oneself is determined in Femtocell base station;
When normally work in Femtocell base station, detect at any time the interference strength of own place frequency, dynamically adjust the maximum transmission power of oneself;
Described Femtocell base station up ISCP when without business estimates interference strength and then adjusts base station down power;
There is business described Femtocell base station and according to intercepting adjacent area descending pilot frequency intensity, estimates co-channel interference intensity and then adjust Femtocell base station down power during without business;
No matter raise described Femtocell base station or lower adjusting power all will be done multi-frame mean to measuring amount;
Two Femtocell base stations respectively will regulate according to the other side's descending DwPTS dynamic changes of strength oneself downstream signal intensity and coverage.
2. a regulating system for Femtocell base station down power, is characterized in that, comprising:
Monitoring unit, the base station signal for detection of in all frequencies that around allow, obtains frequency range service condition, and the interference power intensity in all frequencies of utilization;
Frequency selected cell, for the frequency of the permission selecting not have to use, or disturbs minimum frequency as the operating frequency of described Femtocell base station;
Power control unit, for according to disturbing the interference strength of minimum frequency or not having the frequency of the permission of use to determine the maximum transmission power of oneself;
Realtime power adjustment unit, for when normally work in Femtocell base station, detects the interference strength of place frequency at any time, dynamically adjusts the maximum transmission power of Femtocell base station;
Described realtime power adjustment unit further comprises:
The first dynamic adjustment unit, estimates interference strength and then adjusts Femtocell base station down power for up ISCP when without business;
Described realtime power adjustment unit further comprises:
The second dynamic adjustment unit, for having business and estimating co-channel interference intensity and then adjust Femtocell base station down power according to intercepting adjacent area descending pilot frequency intensity during without business;
No matter raise described Femtocell base station or lower adjusting power all will be done multi-frame mean to measuring amount;
Two Femtocell base stations respectively will regulate according to the other side's descending DwPTS dynamic changes of strength oneself downstream signal intensity and coverage.
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| CN102547947B (en) * | 2012-02-29 | 2015-05-27 | 电子科技大学 | Self-adaptive home base station power control method |
| CN103327598B (en) * | 2012-03-22 | 2016-04-06 | 华为技术有限公司 | access point power method and device |
| US9775164B2 (en) | 2014-01-28 | 2017-09-26 | Netgear, Inc. | Automatic wireless network channel selection |
| CN104333896B (en) | 2014-11-28 | 2018-12-25 | 东莞宇龙通信科技有限公司 | Microcell base station and its method of adjustment and adjustment system for sending power |
| CN104540205B (en) * | 2014-12-30 | 2018-11-06 | 京信通信系统（中国）有限公司 | A kind of base station transmitting power configuration method and device |
| CN106900050B (en) * | 2015-12-17 | 2020-01-31 | 普天信息技术有限公司 | downlink power processing method, processor and base station |
| CN110996332A (en) * | 2019-12-25 | 2020-04-10 | 公安部第一研究所 | Coverage self-adaptive adjusting method based on interference |
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| CN101277506A (en) * | 2008-04-28 | 2008-10-01 | 华为技术有限公司 | Method and device for planning wireless network |
| CN101426209A (en) * | 2008-12-12 | 2009-05-06 | 中兴通讯股份有限公司 | Cell configuring method and system based on micro-cell base station |
| CN101652935A (en) * | 2007-02-02 | 2010-02-17 | Ubiquisys有限公司 | Method and base station to control access point transmit power |
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| CN101652935A (en) * | 2007-02-02 | 2010-02-17 | Ubiquisys有限公司 | Method and base station to control access point transmit power |
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Date of cancellation: 20221012 Granted publication date: 20140319 |
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Effective date of registration: 20230308 Address after: No. 10, Floor 5, Unit 2, Building 13, No. 138, Section 3, Changjiang Road, Xihanggang, Shuangliu District, Chengdu, Sichuan, 610200 Patentee after: Yang Xiaolin Address before: Room 506b, South Building, Chengye building, Pioneer Park, torch hi tech Zone, Xiamen, Fujian, 361101 Patentee before: BRAVOCOM (XIAMEN) TECH Co.,Ltd. |
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Correction item: Patentee|Address Correct: BRAVOCOM (XIAMEN) TECH Co.,Ltd.|Room 506b, South Building, Chengye building, Pioneer Park, torch hi tech Zone, Xiamen, Fujian, 361101 False: Yang Xiaolin|No. 10, Floor 5, Unit 2, Building 13, No. 138, Section 3, Changjiang Road, Xihanggang, Shuangliu District, Chengdu, Sichuan, 610200 Number: 12-01 Volume: 39 |
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Effective date of registration: 20230731 Address after: No. 10, 5th Floor, Unit 2, Building 13, No. 138, Section 3, Changjiang Road, Xihanggang, Shuangliu District, Chengdu City, Sichuan Province, 610000 Patentee after: Yang Xiaolin Address before: 361003 Room 506B, South Building, Chengye Building, Pioneer Park, Xiamen Torch High-tech Zone, Xiamen, Fujian Province Patentee before: BRAVOCOM (XIAMEN) TECH Co.,Ltd. |