CN102711122B - Femtocell interference suppression method combining with frequency spectrum distribution and power control - Google Patents
Femtocell interference suppression method combining with frequency spectrum distribution and power control Download PDFInfo
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- CN102711122B CN102711122B CN201210178877.0A CN201210178877A CN102711122B CN 102711122 B CN102711122 B CN 102711122B CN 201210178877 A CN201210178877 A CN 201210178877A CN 102711122 B CN102711122 B CN 102711122B
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Abstract
The invention provides a Femtocell interference suppression method combing with a frequency spectrum distribution and a power control, relates to a Femtocell interference suppression method, and aims to achieve interference suppression between the Femtocell and a macro cellular when the Femetocell and the macro base state adopt a common communication channel configuration or part of the common communication channel configuration. The Femtocell interference suppression method comprises the following steps: firstly, the sensing-based frequency spectrum distribution scheme is used to divide the frequency spectrum into a specific frequency spectrum for the macro cellular and a macro cellular common frequency spectrum for Femtocell; based on Doppler parameter low speed of a reference signal received by a macrocell, the speed of a macro cellular UE (User Experience) around the Femtocell is evaluated; whether the macro cellular user uses the specific frequency spectrum for the macro cellular or not is determined according to the threshold value of the speed; and the used frequency spectrum resource is determined by the reported feedback value of a CQI (Channel Quality Indicator). Meanwhile, the power control means is started when the intensiveness of the Femtocell reaches a certain threshold to evaluate the amount of active Femtocell in each cluster, and the Femtocell initial interference tolerance is set up by broadcast. The invention is suitable for the Femtocell interference suppression.
Description
Technical field
The present invention relates to disturb in a kind of Femtocell the method for inhibition.
Background technology
How throughput economic and that provide efficiently good indoor covering to promote the whole network with message transmission rate is at a high speed the major issue that mobile cellular net need to solve always, Femtocell is with the advantage of this respect uniqueness, once proposition, each Mobile Network Operator and the favor of equipment vendor are mostly just obtained.
For meeting the transfer of data of higher rate, LTE-A needs very high bandwidth, this means and many times needs to operate in high band.It is not any good news that but the deep fade characteristic of high frequency band signal makes it for the quality of indoor signal.But the scheme income of traditional raising cell base station transmitting power is lower, and indoor covering constructional difficulties and cost higher.So, 3GPP starts to promote the standard operation of Femtocell, because LTE-A is the network of all-IP, Femtocell realizes the passback of signal by IP network, and IP-based when present Internet service, this means bandwidth that strong base station can utilize family mobile phone signal return the machine room to operator, its overall network architecture is shown in accompanying drawing 1.
Femtocell base station (FemtocellAccess Point, FAP) is a kind of microminiature mobile base station that is then arranged on the indoor plug and play of user by the own purchase of user.The radiation radius of Femtocell is less, is generally 10-30m, and transmitting power is extremely low, is generally 10～100mW, the frequency range that the frequency range that it utilizes is place macrocellular.Introducing Femtocell can bring better indoor user to experience in solving user cost.Experience by FAP, can obviously improve user's bandwidth, user will obtain better service quality; The deployment of FAP can obviously reduce the load of macrocellular, obvious to the business load shunting effect of macrocellular, can significantly reduce network congestion; And because FAP is disposed by user oneself, operator will set up in machine room, power supply, base station and a large amount of cost of aspect saving such as maintenance, meanwhile, the release of home domain service package will improve user's stickiness greatly.Because the covering radius of FAP is little, transmitting power is low, and the transmitting power of user's mobile terminal is also less demanding, has so not only extended the service time of the battery of terminal, and reduces radiation injury.And no matter user outside still at home, access be all the service network of same operator, enjoying same service safe.And really realize a mobile terminal, a number, an address list, the facility of a bill.
But the maximum technological challenge that Femtocell faces is exactly to introduce the interference problem that Femtocell brings.According to 3GPP technical report, the deployment meeting of HeNB produces and disturbs macrocellular.Generally speaking introducing Femtocell will bring with layer interference and cross-level interference.Disturbing with layer is the interference between adjacent Femtocell, and cross-level disturbs and is present between Femtocell and the macrocellular at its place.The main interference scene existing in Femtocell macrocell system is shown in accompanying drawing 2.
The design of HeNB has the features such as user configures voluntarily, network topology structure real-time change; In the widely used situation of HeNB, coordinate FemtoceIl and macrocellular because workload is huge and infeasible by the traditional network planning.The deployment of HeNB could be on the basis of macrocellular network, to carry out in order investigating, the loss of throughput of macrocellular under the interference of HeNB will be to weigh whether within the scope that can tolerate.For Femtocell, macrocellular user's interference problem is studied and extremely had theory significance and construction value.
The frequency resource allocation of Femtocell and macro base station has following three kinds of methods:
Method one: both use identical frequency band, although be total to channel configuration, both can use more frequency resource, can have larger interference between the two.
Method two: both use respectively independently orthogonal frequency band, although i.e. independent channel configuration has reduced interference between the two like this, has also reduced the spectrum efficiency of system simultaneously.
Method three: both common sparing frequency bands, part altogether channel configuration the method combine the advantage of above-mentioned two kinds of Resource Allocation Formulas, it has considered two factors that affect throughput of system, and therefore spectrum efficiency and common-channel interference can obtain good systematic function.This scheme is the frequency resource allocation scheme of current industry extensive concern.
When Femtocell and macro base station adopt altogether channel or part altogether when channel configuration, the main interference scene existing in system is the interference between interference and Femtocell and the macro base station between Femtocell.
Summary of the invention
The present invention be for realize Femtocell and macro base station adopt channel altogether or part altogether under channel configuration the interference between Femtocell and macrocellular suppress, thereby the method for disturbing inhibition in the Femtocell of a kind of combination spectrum allocation may and power control is provided.
In the Femtocell of combination spectrum allocation may and power control, disturb the method suppressing, it is realized by following steps:
Step 1, the frequency spectrum of UE all macrocell is divided into Femtocell common spectrum and the special frequency spectrum of macrocellular, macro base station is added up described Femtocell common spectrum and the special frequency spectrum of macrocellular, and acquisition is arranged in interference region and uses the UE of the special frequency spectrum of macrocellular to gather;
Step 2, macro base station receive reference signal, and estimate one by one the speed of the UE of the special frequency spectrum of each use macrocellular in step 1 according to the Doppler frequency shift of reference signal, and all compare with default thresholding, use the UE set of the special frequency spectrum of macrocellular to remove from being arranged in interference region described in step 1 the UE that exceedes threshold value;
Whether step 3, the UE of the special frequency spectrum of each use macrocellular reports in determining step two one by one CQI value be higher than the CQI value of the use Femtocell common spectrum of this UE, if judged result is yes, this UE is retained in to the UE set that is arranged in interference region and uses the special frequency spectrum of macrocellular; If judged result is no, use the UE set of the special frequency spectrum of macrocellular to remove being arranged in interference region this UE;
Whether judgement is not used CQI value that the UE of the macrocell of the special frequency spectrum of macrocellular reports higher than the CQI value of the use Femtocell common spectrum of this UE in interference region one by one, if judged result is yes, use outside the UE set of the special frequency spectrum of macrocellular being arranged in interference region still this UE being got rid of; If judged result is no, this UE is added to the UE set that is arranged in interference region and uses the special frequency spectrum of macrocellular;
Step 4, in the time that user's the dense degree that uses Femtocell common spectrum reaches predetermined threshold value, adopt the mode of broadcast by all UE of jamming margin notice macrocell of FUE, the all UE of macrocell arrange Initial Trans, realize in Femtocell and disturb and suppress.
The present invention realized Femtocell and macro base station adopt channel altogether or part altogether under channel configuration the interference between Femtocell and macrocellular suppress.
Brief description of the drawings
Fig. 1 is the overall network architecture schematic diagram of the LTE-A of the standard based on Femtocell in background technology; Fig. 2 is the model schematic diagram of the macrocell of the main interference scene of an existence in Femtocell macrocell system in background technology, and in figure, 1 represents Broadband Router(broadband route), 2 represent Mobile Core Network(mobile core networks); Fig. 3 is the algorithm flow chart of responding to estimate the Femtocell in active state in cluster in embodiment one based on centralized system; Fig. 4 is the principle schematic of the power control scheme based on concentrated perception in the present invention; Fig. 5 is part channel configuration principle schematic altogether between a macrocellular and Femtocell.
Embodiment
Embodiment one, in conjunction with Fig. 1, this embodiment is described, disturbs the method suppressing in the Femtocell of a kind of combination spectrum allocation may and power control, it is realized by following steps:
Step 1, the frequency spectrum of UE all macrocell is divided into Femtocell common spectrum and the special frequency spectrum of macrocellular, macro base station is added up described Femtocell common spectrum and the special frequency spectrum of macrocellular, and acquisition is arranged in interference region and uses the UE of the special frequency spectrum of macrocellular to gather;
Step 2, macro base station receive reference signal, and estimate one by one the speed of the UE of the special frequency spectrum of each use macrocellular in step 1 according to the Doppler frequency shift of reference signal, and all compare with default thresholding, use the UE set of the special frequency spectrum of macrocellular to remove from being arranged in interference region described in step 1 the UE that exceedes threshold value;
Whether step 3, the UE of the special frequency spectrum of each use macrocellular reports in determining step two one by one CQI value be higher than the CQI value of the use Femtocell common spectrum of this UE, if judged result is yes, this UE is retained in to the UE set that is arranged in interference region and uses the special frequency spectrum of macrocellular; If judged result is no, use the UE set of the special frequency spectrum of macrocellular to remove being arranged in interference region this UE;
Whether judgement is not used CQI value that the UE of the macrocell of the special frequency spectrum of macrocellular reports higher than the CQI value of the use Femtocell common spectrum of this UE in interference region one by one, if judged result is yes, use outside the UE set of the special frequency spectrum of macrocellular being arranged in interference region still this UE being got rid of; If judged result is no, this UE is added to the UE set that is arranged in interference region and uses the special frequency spectrum of macrocellular;
Step 4, in the time that user's the dense degree that uses Femtocell common spectrum reaches predetermined threshold value, adopt the mode of broadcast by all UE of jamming margin notice macrocell of FUE, the all UE of macrocell arrange Initial Trans, realize in Femtocell and disturb and suppress.
Principle: for convenience of description, first definition below with accompanying drawing in each label:
Th
fM: the other thresholding of CQI value difference that uses public frequency spectrum and special frequency spectrum;
Th
v: the translational speed thresholding that disturbs macrocellular UE in pond;
Th
fdensity: the dense degree thresholding of Femtocell in certain area;
the quantity of Femtocell in every cluster of estimating;
δ: maximum outage probability;
P
r: the power margin of each Femtocell;
The present invention proposes the scheme of interference problem between a kind of Femtocell of solution and macrocell.This scheme combines spectrum allocation may and power control, can better solve between Femtocell and macrocell and disturb.Do not consider the impact of Femtocell on system and Femtocell is configured such that to the frequency spectrum scheme of using with the on all four frequency spectrum resource of macrocellular will bring huge interference problem, affect the experience of macrocell user and Femtocell, the impact that brings whole system throughput to reduce.
In this scheme proposing in the present invention, frequency spectrum is divided into the special frequency spectrum of macrocell and the public frequency spectrum of Femtocell-macrocell.If all use identical frequency spectrum resource, at the covering edge of Femtocell, between macrocellular user and Femtocell user, can produce strong interference, that is to say that the covering marginal existence of Femtocell risk of interference district.The macrocellular user who is in this deathtrap will use the special frequency spectrum of macrocellular to disturb to reduce.Provide the part example of channel configuration altogether between a macrocellular and Femtocell below, see accompanying drawing 5.If public frequency spectrum not with six Resource Block (resourceblock, RB) overlaid at the center of macrocellular downstream spectrum, it will not affect UE and receive descending PBCH channel and synchronizing signal for that.
The service of macrocell of the place operator using due to Femtocell, macrocell has enough Femtocell being in wherein to take the information of frequency spectrum and general positional information, macrocell can be set up a deathtrap list, and the UE under the macrocell in this region will affect greatly Femtocell around.Thereby the UE in this region will distribute the special frequency spectrum of macrocell.Simultaneously the Doppler frequency shift of the signal based on receiving UE is estimated UE speed radially by macrocell, if UE with one higher than threshold T h
vspeed leave disturb pond, he will be in dangerous list so.Once but UE speed is lower than a threshold T h
v, it will be listed in and disturb in list so, and the frequency range using can only be also the special frequency range of macrocell.Meanwhile, the UE under macrocell adjusts used frequency range by the value of the CQI based on UE this is special frequency range or public frequency range.By CQI(Channel Quality Indicator) report and the UE of the macrocell of doubtful interference source can be listed as to and disturb in pond and by the eliminated danger interference source UE release in list.System quantizes by such thresholding is set the CQI difference that the Femtocell of whole system and the public frequency spectrum of macrocell and the special frequency spectrum of macrocell cause.If this CQI value is lower than this threshold T h
fM, this reports the UE will be deleted from disturbing pool list so, if this CQI value is higher than this threshold T h
fM, this reports UE will be listed as in interference pool list so.(1), if the UE under macro base station can support to report all subbands, if belong to so the value that the CQI value of the subband of the special frequency spectrum of macrocellular belongs to the public frequency spectrum of Femtocell higher than those, this reports UE to enter and disturbs pond so.(2) if the UE under macro base station only supports to report the CQI value of part subband, UE will select M subband of Femtocell common spectrum so, and reports a reaction by the CQI value of M subband transmission.In addition, UE reports the CQI value of whole bandwidth simultaneously.Thereby, macro base station can be easily relatively whether the CQI value by Femtocell common spectrum lower than by the value of whole bandwidth, if lower than the value of whole bandwidth, UE will enter interference pool list so.UE selectivity subband feedback will be undertaken by two kinds of modes once.(a) in the broadcast message of macro base station, comprise the subband map information of Femtocell common spectrum and the special frequency spectrum of macrocellular, thereby UE self can Storage Mapping information, and by the autonomous selection M subband of certain algorithm.(b) macro base station notifies UE to choose M subband by sending high layer information, and UE reports CQI according to the subband index of notice.When the Femtocell under the active state around of the UE under base station gathers to a certain degree, this UE will receive the interference of aggregation.So when the Femtocell concentration class in certain limit reaches certain thresholding, just enable immediately the power control scheme based on concentrating perception.In concentrated perception power control scheme, macrocell can be estimated to be in every cluster wherein all quantity of the Femtocell in active state, then helps each Femtocell by broadcast jamming margin initial transmit power parameter is set.Specifically, when the Femtocell concentration class in certain limit reaches certain thresholding Th
fdensity, macro base station immediately starting power control program figure is shown in accompanying drawing 4.In concentrated perception power control scheme, macrocell can estimate to be in all lists of the Femtocell in active state in every cluster wherein, then helps each Femtocell by broadcast jamming margin initial transmit power parameter is set.Because once the quantity of the Femtocell in active state in cluster can estimate, just can the calculating of the jamming margin of each Femtocell.Respond to estimate that based on centralized system the algorithm of the Femtocell in active state in cluster is shown in accompanying drawing 3.
Between Femtocell and macrocellular in the frequency assignment procedure of perception Femtocell, specific implementation process is:
First, delimit the special frequency spectrum of macrocell and Femtocell and the public frequency spectrum of macrocell.Meanwhile, the information of the Femtocell perceiving by macro base station determines that the position of Femtocell is tentatively to delimit risk of interference region, and the preliminary list of determining macrocellular UE in interference pond.
The Doppler frequency shift parameter of the reference signal next, receiving by macro cell base station estimates to be in the macro cell base station user's who disturbs pond speed.If macrocell user is just with higher than a certain threshold value speed Th
vleave and disturb pond, it can use Femtocell and the public frequency spectrum of macrocell so.If speed is lower than some threshold T h
v, it will be regarded as the interference source of Femtocell so, so can only reduce interference with the special frequency spectrum of macrocell.
Again next, report and the UE of the macrocell of doubtful interference source can be listed as to and disturb in pond and by the interference source UE eliminating in list by CQI.System quantizes by such thresholding is set the CQI difference that the Femtocell of whole system and the public frequency spectrum of macrocell and the special frequency spectrum of macrocell cause.If this CQI value is lower than this threshold T h
fM, this reports the UE will be deleted from disturbing pool list so, if this CQI value is higher than this threshold T h
fM, this reports UE will be listed as in interference pool list so.
Between Femtocell and macrocellular in the power control process of perception Femtocell, concrete implementation procedure is:
When the Femtocell concentration class in certain limit reaches certain thresholding Th
fdensity, just enable immediately the power control scheme based on concentrating perception.Conceptual scheme is shown in accompanying drawing 5.In concentrated perception power control scheme, macrocell can be estimated to be in every cluster wherein all quantity of the Femtocell in active state, then helps each Femtocell by broadcast jamming margin initial transmit power parameter is set.Because once the quantity of the Femtocell in active state in cluster can estimate, just can the calculating of the jamming margin of each Femtocell.Respond to estimate that based on centralized system the algorithm of the Femtocell in active state in cluster is shown in accompanying drawing 3.
The concrete implementation procedure of disturbing between the inhibition Femtocell of the spectrum allocation may based on perception and power control and macrocellular is:
The scheme that whole interference suppresses is not only the scheme of simple spectrum allocation schemes or power control, but says that both organically combine.The basis of whole scheme when spectrum allocation may based on perception, and the dense degree of Femtocell in certain limit has reached certain thresholding, the radiant power of all Femtocell arranges the broadcast based on macro base station.
Claims (1)
1. in conjunction with disturbing the method suppressing in the Femtocell of spectrum allocation may and power control, it is characterized in that: it is realized by following steps:
Step 1, the frequency spectrum of user UE all macrocell is divided into femtocell Femtocell common spectrum and the special frequency spectrum of macrocellular, macro base station is added up described Femtocell common spectrum and the special frequency spectrum of macrocellular, and acquisition is arranged in interference region and uses the UE of the special frequency spectrum of macrocellular to gather;
Step 2, macro base station receive reference signal, and estimate one by one the speed of the UE of the special frequency spectrum of each use macrocellular in step 1 according to the Doppler frequency shift of reference signal, and all compare with default thresholding, use the UE set of the special frequency spectrum of macrocellular to remove from being arranged in interference region described in step 1 the UE that exceedes threshold value;
Whether step 3, the UE of the special frequency spectrum of each use macrocellular reports in determining step two one by one channel quality indicator CQI value be higher than the CQI value of the use Femtocell common spectrum of this UE, if judged result is yes, this UE is retained in to the UE set that is arranged in interference region and uses the special frequency spectrum of macrocellular; If judged result is no, use the UE set of the special frequency spectrum of macrocellular to remove being arranged in interference region this UE;
Whether judgement is not used CQI value that the UE of the macrocell of the special frequency spectrum of macrocellular reports higher than the CQI value of the use Femtocell common spectrum of this UE in interference region one by one, if judged result is yes, use outside the UE set of the special frequency spectrum of macrocellular being arranged in interference region still this UE being got rid of; If judged result is no, this UE is added to the UE set that is arranged in interference region and uses the special frequency spectrum of macrocellular;
Step 4, in the time that user's the dense degree that uses Femtocell common spectrum reaches predetermined threshold value, adopt the mode of broadcast by the user's of each use Femtocell common spectrum all UE of jamming margin notice macrocell, the all UE of macrocell arrange Initial Trans, realize in Femtocell and disturb and suppress;
In the time that the Femtocell concentration class in certain limit reaches certain thresholding, enable the power control scheme based on concentrating perception; In concentrated perception power control scheme, macrocell is estimated to be in every cluster wherein all quantity of the Femtocell in active state, calculate the jamming margin of each Femtocell, then help each Femtocell by broadcast jamming margin initial transmit power parameter is set.
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| WO2015081570A1 (en) * | 2013-12-06 | 2015-06-11 | Orange | Method for scheduling user equipment in a heterogeneous network |
| CN103906246B (en) * | 2014-02-25 | 2017-06-30 | 北京邮电大学 | A kind of wireless backhaul resource regulating method under honeycomb heterogeneous network |
| CN104272785A (en) * | 2014-02-25 | 2015-01-07 | 华为技术有限公司 | Spectrum processing method, base station, user equipment and system |
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| CN102006599A (en) * | 2010-11-05 | 2011-04-06 | 北京邮电大学 | Interference suppression method of hybrid network of macrocell and Femtocell |
| CN102098680A (en) * | 2011-03-16 | 2011-06-15 | 北京邮电大学 | Dynamic frequency spectrum management method and system |
| CN102098792A (en) * | 2011-03-23 | 2011-06-15 | 西安电子科技大学 | Service quality-based resource round-robin scheduling method |
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| CN102006599A (en) * | 2010-11-05 | 2011-04-06 | 北京邮电大学 | Interference suppression method of hybrid network of macrocell and Femtocell |
| CN102098680A (en) * | 2011-03-16 | 2011-06-15 | 北京邮电大学 | Dynamic frequency spectrum management method and system |
| CN102098792A (en) * | 2011-03-23 | 2011-06-15 | 西安电子科技大学 | Service quality-based resource round-robin scheduling method |
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