CN102711122A - 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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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 among a kind of Femtocell the method that suppresses.
Background technology
How economical and good indoor covering and high-speed data transmission speed are provided efficiently and the throughput that promotes the whole network is the major issue that the mobile cellular net need solve always; Femtocell is with this respect special advantages; Once proposition, each Mobile Network Operator and the favor of equipment vendor have mostly just been obtained.
For satisfying the transfer of data of higher rate, LTE-A needs very high bandwidth, this means many times to operate in high band.It is not any good news for the quality of indoor signal that but the deep fade characteristic of high frequency band signal makes it.Yet the scheme income of traditional raising cell base station transmitting power is lower, and indoor covering constructional difficulties and cost are higher.So; 3GPP begins to promote the standard operation of Femtocell; Because LTE-A is the network of all-IPization, Femtocell realizes the passback of signal through IP network, and IP-based during present Internet service; This means that bandwidth that strong base station can utilize family passes back to the machine room of operator to mobile phone signal, its overall network architecture is seen accompanying drawing 1.
(FemtocellAccess Point FAP) is a kind of microminiature mobile base station that is installed in the indoor plug and play of user by the own purchase of user then in the Femtocell base station.The radiation radius of Femtocell is less, is generally 10-30m, and transmitting power is extremely low, is generally 10～100mW, and the frequency range that it utilizes is the frequency range of place macrocellular.Introduce Femtocell and can when solving user cost, bring better indoor user experience.Experience through FAP, can obviously improve user's bandwidth, the user will obtain better service quality; The deployment of FAP can obviously reduce the load of macrocellular, and is obvious to the business load shunting effect of macrocellular, can significantly reduce network congestion; And because FAP is by user oneself deployment, operator will set up in machine room, power supply, base station and a large amount of cost of aspect saving such as maintenance, and simultaneously, 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 portable terminal is also less demanding, has so not only prolonged the service time of the battery at terminal, and reduces radiation injury.And no matter the user outside still at home, access all be the service network of same operator, enjoying same service safe property.And really realized a portable terminal, a number, an address list, the facility of a bill.
Yet the maximum technological challenge that Femtocell faced is exactly to introduce the interference problem that Femtocell brought.Based on the 3GPP technical report, the deployment meeting of HeNB produces macrocellular and disturbs.Generally speaking introducing Femtocell will bring with layer interference and cross-level interference.Disturbing with layer is the interference between the adjacent Femtocell, and cross-level disturbs and is present between the macrocellular at Femtocell and its place.The main interference scene that exists in the Femtocell macrocell system is seen accompanying drawing 2.
The design of HeNB has characteristics such as the user disposes voluntarily, network topology structure real-time change; Under the widely used situation of HeNB, huge and infeasible owing to workload through traditional network planning coordination FemtoceIl and macrocellular.Could on the basis of macrocellular network, to carry out the deployment of HeNB in order investigating, will to weigh in the loss of throughput of macrocellular under the interference of HeNB whether within the scope that can tolerate.To Femtocell macrocellular user's interference problem is studied ten minutes and have 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, and both can both use more frequency resources though promptly be total to channel configuration, can have bigger interference between the two.
Method two: both use the independently frequency band of quadrature respectively, though i.e. independent channel configuration has reduced interference between the two like this, have also reduced the spectrum efficiency of system simultaneously.
Method three: both common sparing frequency bands; Promptly part is total to the advantage that this method of channel configuration has combined above-mentioned two kinds of Resource Allocation Formulas; It has taken all factors into consideration two factors that influence throughput of system, and therefore spectrum efficiency and common-channel interference can obtain systematic function preferably.This scheme is the frequency resource allocation scheme of present industry extensive concern.
When Femtocell and macro base station adopt altogether channel or part altogether during channel configuration, the main interference scene that exists in the system is interference and the interference between Femtocell and the macro base station between the Femtocell.
Summary of the invention
The present invention be for realize Femtocell and macro base station adopt channel altogether or part altogether under the channel configuration interference between Femtocell and macrocellular suppress, thereby the method for disturbing inhibition among a kind of Femtocell that combines spectrum allocation may and power control is provided.
Disturb the method that suppresses among a kind of Femtocell that combines spectrum allocation may and power to control, it is realized by following steps:
The frequency spectrum of step 1, UE that macrocell is all is divided into Femtocell common spectrum and the special-purpose frequency spectrum of macrocellular; Macro base station is added up said Femtocell common spectrum and the special-purpose frequency spectrum of macrocellular, obtains to be arranged in the UE set that interference region uses the special-purpose frequency spectrum of macrocellular;
Whether the judgement CQI value that UE of the macrocell of the special-purpose frequency spectrum of use macrocellular does not report in interference region is higher than the CQI value of the use Femtocell common spectrum of this UE one by one; If judged result is for being, then will be still this UE be got rid of and be arranged in outside the UE set that interference region uses the special-purpose frequency spectrum of macrocellular; If judged result then adds the UE set that is arranged in the special-purpose frequency spectrum of interference region use macrocellular with this UE for not;
The present invention realized Femtocell and macro base station adopt channel altogether or part altogether under the channel configuration interference between Femtocell and macrocellular suppress.
Description of drawings
Fig. 1 is based on the overall network architecture sketch map of the LTE-A of the standard of Femtocell in the background technology; Fig. 2 is the model sketch map of the macrocell of the main interference scene of an existence in the Femtocell macrocell system in the background technology, 1 expression Broadband Router (broadband route) among the figure, 2 expression Mobile Core Network (mobile core network); Fig. 3 is an algorithm flow chart of responding to the Femtocell that estimates to be in the cluster active state in the embodiment one based on centralized system; Fig. 4 is based on the principle schematic of the power control scheme of concentrating perception among the present invention; Fig. 5 is that part is total to the channel configuration principle schematic between a macrocellular and the Femtocell.
Embodiment
Embodiment one, combination Fig. 1 explain this embodiment, disturb the method that suppresses among a kind of Femtocell that combines spectrum allocation may and power to control, and it is realized by following steps:
The frequency spectrum of step 1, UE that macrocell is all is divided into Femtocell common spectrum and the special-purpose frequency spectrum of macrocellular; Macro base station is added up said Femtocell common spectrum and the special-purpose frequency spectrum of macrocellular, obtains to be arranged in the UE set that interference region uses the special-purpose frequency spectrum of macrocellular;
Whether the judgement CQI value that UE of the macrocell of the special-purpose frequency spectrum of use macrocellular does not report in interference region is higher than the CQI value of the use Femtocell common spectrum of this UE one by one; If judged result is for being, then will be still this UE be got rid of and be arranged in outside the UE set that interference region uses the special-purpose frequency spectrum of macrocellular; If judged result then adds the UE set that is arranged in the special-purpose frequency spectrum of interference region use macrocellular with this UE for not;
Principle: describe for ease, at first define each label in hereinafter and the accompanying drawing:
Th
FM: the other thresholding of CQI value difference that uses public frequency spectrum and special-purpose frequency spectrum;
Th
v: the translational speed thresholding that disturbs macrocellular UE in the pond;
Th
Fdensity: the dense degree thresholding of Femtocell in certain zone;
The quantity of Femtocell in each bunch that
estimates;
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 the macrocell.This scheme has combined spectrum allocation may and power control, can better solve between Femtocell and the macrocell and disturb.Do not consider that Femtocell is configured such that to use with the frequency spectrum scheme of the on all four frequency spectrum resource of macrocellular to the influence of system and with Femtocell and will bring huge interference problem; Influence the experience of macrocell user and Femtocell, the influence that brings the whole system throughput to reduce.
In this scheme that the present invention proposes, frequency spectrum is divided into special-purpose 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, can produce strong interference between macrocellular user and the Femtocell user, that is to say that the covering marginal existence of Femtocell the risk of interference district.The macrocellular user who is in this deathtrap will use the special-purpose frequency spectrum of macrocellular to disturb to reduce.Provide the example that partly is total to channel configuration between a macrocellular and the Femtocell below, see accompanying drawing 5.(it will not influence UE and receive descending PBCH channel and synchronizing signal for that for resourceblock, RB) overlaid if public frequency spectrum is not with six Resource Block at the center of macrocellular downstream spectrum.
Because the service of the macrocell of the place operator that Femtocell uses; Macrocell has enough Femtocell that is in wherein to take the information of frequency spectrum and general positional information; Macrocell can be set up a deathtrap tabulation, and the UE under the macrocell in this zone will affect greatly Femtocell on every side.Thereby this regional UE will distribute the special-purpose frequency spectrum of macrocell.Macrocell will be estimated UE speed radially based on the Doppler frequency shift of the signal that receives UE simultaneously, if UE is higher than threshold T h with one
vSpeed leave and disturb the pond, he will be in the danger tabulation so.In case but UE speed is lower than a threshold T h
v, it will be listed in and disturb in the tabulation so, and employed frequency range also can only be the special-purpose frequency range of macrocell.Simultaneously, the UE under the macrocell will adjust employed frequency range based on the value of the CQI of UE this will be special-purpose frequency range or public frequency range.Report and to be listed as the eliminated danger interference source UE release in the interference pond and in will tabulating to the UE of the macrocell of doubtful interference source through CQI (Channel Quality Indicator).System will be provided with such thresholding and quantize Femtocell and the public frequency spectrum of macrocell of whole system and the CQI difference that the special-purpose frequency spectrum of macrocell is caused.If this CQI value is lower than this threshold T h
FM, this reports UE from disturb pool list, to be deleted so, if this CQI value is higher than this threshold T h
FM, this reports UE will be listed as in the interference pool list so.(1) if the UE under the macro base station can support to report all subbands, be higher than the value that those belong to the public frequency spectrum of Femtocell if belong to the CQI value of the subband of the special-purpose frequency spectrum of macrocellular so, this reports UE to get into and disturbs the pond so.(2) if the UE under the macro base station only supports to report the CQI value of part subband, UE will select M subband of Femtocell common spectrum so, and report the CQI value of a reaction through M subband transmission.In addition, UE reports the CQI value of whole bandwidth simultaneously.Thereby, macro base station can be easily relatively the CQI value through the Femtocell common spectrum whether be lower than value through whole bandwidth, if be lower than the value of whole bandwidth, UE will get into and disturb pool list so.UE selectivity subband feedback will be carried out through dual mode once.(a) comprise the subband map information of the special-purpose frequency spectrum of Femtocell common spectrum and macrocellular in the broadcast message of macro base station, thereby UE self can Storage Mapping information, and through the autonomous selection M subband of certain algorithm.(b) macro base station notifies UE to choose M subband through sending high layer information, and UE reports CQI according to the subband index of notice.Femtocell under the active state around the UE under the base station gathers to a certain degree, and this UE will receive the interference of aggregation.So the Femtocell concentration class in certain limit reaches certain thresholding, just launch immediately based on the power control scheme of concentrating perception.In concentrated perception power control scheme, macrocell can estimate to be in the quantity that all is in the Femtocell of active state in each bunch wherein, helps each Femtocell through the broadcasting jamming margin then initial transmit power parameter is set.Specifically, the Femtocell concentration class in certain limit reaches certain thresholding Th
Fdensity, macro base station starting power controlling schemes figure is immediately seen accompanying drawing 4.In concentrated perception power control scheme, macrocell can estimate to be in the tabulation that all is in the Femtocell of active state in each bunch wherein, helps each Femtocell through the broadcasting jamming margin then initial transmit power parameter is set.Because in case the quantity of the Femtocell that is in active state in the cluster can estimate out, just can the calculating of the jamming margin of each Femtocell.Respond to the algorithm of the Femtocell that estimates to be in the cluster active state based on centralized system and see accompanying drawing 3.
Between Femtocell and the macrocellular in the frequency assignment procedure of perception Femtocell, concrete implementation procedure is:
At first, delimit the special-purpose frequency spectrum of macrocell and Femtocell and the public frequency spectrum of macrocell.Simultaneously, the information of the Femtocell that perceives through macro base station is confirmed the position of Femtocell with preliminary delimitation risk of interference zone, and the preliminary tabulation of confirming to disturb macrocellular UE in the pond.
The Doppler frequency shift parameter of the reference signal that next, receives through macro cell base station estimates to be in the macro cell base station user's who disturbs the pond speed.If the macrocell user is just to be higher than a certain threshold value speed Th
vLeave and disturb the 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 use the special-purpose frequency spectrum of macrocell to reduce interference.
Again next, report and to be listed as the interference source UE eliminating in the interference pond and in will tabulating to the UE of the macrocell of doubtful interference source through CQI.System will be provided with such thresholding and quantize Femtocell and the public frequency spectrum of macrocell of whole system and the CQI difference that the special-purpose frequency spectrum of macrocell is caused.If this CQI value is lower than this threshold T h
FM, this reports UE from disturb pool list, to be deleted so, if this CQI value is higher than this threshold T h
FM, this reports UE will be listed as in the interference pool list so.
Between Femtocell and the macrocellular in the power control process of perception Femtocell, concrete implementation procedure is:
Femtocell concentration class in certain limit reaches certain thresholding Th
Fdensity, just launch immediately based on the power control scheme of concentrating perception.Conceptual scheme is seen accompanying drawing 5.In concentrated perception power control scheme, macrocell can estimate to be in the quantity that all is in the Femtocell of active state in each bunch wherein, helps each Femtocell through the broadcasting jamming margin then initial transmit power parameter is set.Because in case the quantity of the Femtocell that is in active state in the cluster can estimate out, just can the calculating of the jamming margin of each Femtocell.Respond to the algorithm of the Femtocell that estimates to be in the cluster active state based on centralized system and see accompanying drawing 3.
Concrete implementation procedure based on disturbing between the inhibition Femtocell of the spectrum allocation may of 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 proposal during based on the spectrum allocation may of perception, and the dense degree of the Femtocell in the certain limit has reached certain thresholding, the radiant power of all Femtocell will be provided with based on the broadcasting of macro base station.
Claims (1)
1. disturb the method that suppresses among the Femtocell that a kind combines spectrum allocation may and power to control, it is characterized in that: it is realized by following steps:
The frequency spectrum of step 1, UE that macrocell is all is divided into Femtocell common spectrum and the special-purpose frequency spectrum of macrocellular; Macro base station is added up said Femtocell common spectrum and the special-purpose frequency spectrum of macrocellular, obtains to be arranged in the UE set that interference region uses the special-purpose frequency spectrum of macrocellular;
Step 2, macro base station receive reference signal; And estimate one by one based on the Doppler frequency shift of reference signal that each uses the speed of the UE of the special-purpose frequency spectrum of macrocellular in the step 1; And all compare with preset thresholding, will use the UE set of the special-purpose frequency spectrum of macrocellular to remove from being arranged in interference region described in the step 1 above the UE of threshold value;
Step 3, whether each CQI value of using the UE of the special-purpose frequency spectrum of macrocellular to report is higher than the CQI value of the use Femtocell common spectrum of this UE in the determining step two one by one; If judged result is for being, then this UE is retained in and is arranged in the UE set that interference region uses the special-purpose frequency spectrum of macrocellular; If judged result is then removed this UE for not in the UE set that is arranged in the special-purpose frequency spectrum of interference region use macrocellular;
Whether the judgement CQI value that UE of the macrocell of the special-purpose frequency spectrum of use macrocellular does not report in interference region is higher than the CQI value of the use Femtocell common spectrum of this UE one by one; If judged result is for being, then will be still this UE be got rid of and be arranged in outside the UE set that interference region uses the special-purpose frequency spectrum of macrocellular; If judged result then adds the UE set that is arranged in the special-purpose frequency spectrum of interference region use macrocellular with this UE for not;
Step 4, when the user's who uses the Femtocell common spectrum dense degree reaches predetermined threshold value; Adopt the jamming margin notice macrocell all UE of the mode of broadcasting with FUE; The all UE of macrocell are provided with Initial Trans, realize disturbing among the Femtocell and suppress.
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