CN102404808A - Method for enhanced inter-cell interference cancellation (eICIC) in heterogeneous network, base station and user equipment - Google Patents

Abstract

The invention discloses a method for enhanced inter-cell interference cancellation (eICIC) in a heterogeneous network, and a corresponding base station and corresponding user equipment. A macro eNodeB (MeNB) defines a signaling to inform a home eNodeB (HeNB) of an event that MeNB cell user equipment (MUE) in a connection mode enters the edge or the neighborhood of an HeNB cell; when HeNB cell user equipment (HUE) is all located at the center of the HeNB cell, the HeNB adopts downlink power control or power settings to reduce the inter-cell interference (ICI) subjected to the MUE on a control channel; the MeNB also can adopt a mechanism of being really or falsely handed over an HeNB cell aiming at that the MUE is either CSG UE (Close Subscriber Group User Equipment) or Non-CSG UE, wherein when the MeNB is falsely handed over to the HeNB cell, a mechanism that the HeNB configures the DRX (Discontinuous Reception) of the HUE can be adopted; and when the MUE in an idle mode enters the edge or the neighborhood of the HeNB cell, if the MUE dwells at the HeNB cell, the HeNB adopts different mechanisms to reduce the ICI subjected to the MUE on the basis that that the MUE is in the connection mode or the idle mode. The method has the characteristics of simplicity, flexibility, high efficiency, and easiness to implement.

Description

Enhancement mode cochannel interference elimination method, base station and subscriber equipment in the heterogeneous network

Technical field

The present invention relates to wireless communication field, be specifically related to method, base station and the subscriber equipment of enhancement mode cochannel interference eliminated in a kind of heterogeneous network.

Background technology

Because individual or mobile communication equipment have required to have the professional ability in broadbands such as multimedia service, game on line, video request program, mobile TV, mobile Internet, wideer band system band, higher peak rate and better edge service quality have become an important need of following individual or GSM.For to the direction evolution of satisfying this demand; 3GPP (3G (Third Generation) Moblie gpp) tissue is as the international organization that is devoted to individual or mobile communication standard work; In April, 2008; In the meeting that China Shenzhen is held, begin to inquire into the standardization effort of the 4th generation (4G) cellular communication system, defined LTE-Advanced (LTE-A) version for carrying out evolution to the 4G in future version from present 3GPP LTE 8.0 versions (LTE).

The LTE-A version has proposed the notion of carrier aggregation.So-called carrier aggregation is meant wideer frequency range of a plurality of continuous or discrete component carriers (CC, component carrer) composition.The LTE-A version also spells out system's frequency range that the LTE-A system need support maximum 100MHz.The frequency range of this 100MHz system both can be one section continuous carrier wave frequency range, also can be to obtain through the discrete carrier wave of multistage being carried out carrier aggregation (CA, carrier aggregation).For example, the CC of 5 continuous or discrete 20MHz can form the frequency range of 1 100MHz.

In addition; Consider that following 80%～90% throughput of system will occur in indoor and the focus scene; But traditional Cellular Networks technology has " heavy outdoor, gently indoor "; " heavy beehive net, light isolated hot spots ", characteristics such as " heavily moving switching, gently fixing nomadic ", one of focus of LTE-A is to be optimized with the focus scene indoor.To this, many companies have all proposed the corresponding techniques scheme, and wherein heterogeneous network (HetNet, heterogeneous networks) can satisfy the LTE-A requirement well.

And; Heterogeneous network has been introduced some transmitting nodes littler with respect to traditional cell base station transmitting power; Comprise Pico cell (Picocell) base station, femtocell (Femtocell) base station and the relay station (Relay) that is used for signal relay; Thereby according to the size of base station transmit signals coverage, the sub-district will be divided into macro cells (Macrocell), Pico cell sub-district (Picocell), femtocell sub-district (Femtocell).Wherein, macrocell base stations (MeNB, macro eNodeB) is equivalent to traditional cell base station, and its signal covers whole macro cells.The Pico cell sub-district is mainly towards office and enterprise customer, and its coverage is limited micromicro honeycomb base station.Aspect application in industry, ABI company of the market research agency estimates in July, 2009, will dispose 36.6 ten thousand micromicro honeycomb base stations to the whole world in 2013.Femtocell (FeNB, femo eNB) is mainly towards the user of Home eNodeB (HeNB, home eNB).The femtocell technology is a kind of household base station technology; Main with solving the problem that covers in the family room, it has innovation characteristics such as running on IP agreement (Internet Protocol), the mobile core network that passes through User IP broadband networks access carrier and subminaturization, plug and play.So femtocell is known as Home eNodeB (HeNB, Home eNB) again, the closed user group that in LTE-A, is otherwise known as (CSG, Close Subscriber Group) base station promptly only has the base station that the subscriber equipment of access rights could insert.Relay station adopts relaying technique, and relaying technique is on the basis of original website, through increasing some new relay stations (or claiming via node), strengthens the distribution density of website and antenna.In the heterogeneous network structure, introduce new node and can with the covering focus scene good guarantee be provided for indoor; The transmitting power of these nodes is little, is convenient to on-premise network neatly; The coverage of these nodes is little simultaneously, can utilize the potential high band frequency spectrum of LTE-A more easily.But the introducing of new node has changed original topology of networks, makes the presence of intercell interference (be called cochannel again and disturb (ICI, Inter-Cell Interference)) of this network configuration become a new challenge.

Below with reference to Fig. 1, the heterogeneous network topological structure of LTE-A system is described.As shown in Figure 1, heterogeneous network comprises: subscriber equipment MUE 111, MUE 112, MUE 113, MUE 114 that macrocell base stations MeNB 110 and MeNB 110 are served; The subscriber equipment PUE 121 that micromicro honeycomb base station PeNB 120 and PeNB 120 are served; The UE (like the MUE among Fig. 1 113) that subscriber equipment HUE 131 and relay station 140 that femtocell HeNB 130 and HeNB 130 are served, said relay station 140 are mainly macro cells provides service.

Below, describe with reference to Fig. 1 pair of represented implication of term relevant with the heterogeneous network of LTE-A system.When considering femtocell (like the HeNB among Fig. 1 130) on down control channel, to send descending control signaling to be in the femtocell cell edge or near the down control channel of MUE (like the MUE among Fig. 1 112) produce the cochannel interference time; Can call invasion base station (Aggressor eNB) to HeNB 130; Call sacrifice base station (Victim eNB) to MeNB 110, call sacrifice UE (Victim UE) being in HeNB 130 cell edges or near MUE 112.In addition; In femtocell (like the HeNB130 among Fig. 1) institute region covered; There are two kinds of UE; Promptly allow the subscriber equipment (CSG UE, closed subscriber group user equipment) (like the HUE among Fig. 1 131) of closed user group and do not allow closed user group (Non-CSG UE, non-closed subscriber group user equipment) UE (like the MUE among Fig. 1 112).The serving BS of CSG UE is HeNB, is CSG UE like HUE among Fig. 1 131, and HeNB 130 is base stations of CSG sub-district.And to the MUE 111 that is in HeNB 130 cell edges; If MUE 111 original attributes are CSG UE; Then it can be done the sub-district and switches (Cell Handover) or district reselecting (Cell reselection) and become HUE; If MUE 111 original attributes are Non-CSG UE, then it cannot be done sub-district switching or district reselecting and still be MUE.The serving BS of Non-CSG UE is MeNB, if are Non-CSG UE like MUE among Fig. 1 111, MeNB110 is the base station of Non-CSG sub-district, and MUE111 cannot insert the wireless area under the HeNB 130.

Heterogeneous network is introduced some transmitting nodes littler with respect to traditional cell base station transmitting power; Comprise micromicro honeycomb base station, femtocell and the relay station that is used for signal relay, its advantage is conspicuous: the introducing of these nodes can provide good guarantee with the covering focus scene for indoor; The transmitting power of these nodes is little, is convenient to on-premise network neatly; The coverage of these nodes is little simultaneously, can utilize the potential high band frequency spectrum of LTE-A more easily.

Than homogeneous networks (Homogeneous networks), heterogeneous network has the following advantages: the requirement of wideband multimedia user to high data rate effectively supported in (1), and favorable user experience is provided; (2) because heterogeneous network has shortened the distance between user and the base station, thus be convenient to utilize in the potential deployment frequency range (comprising 450MHz～470MHz, 790MHz～862MHz, 698MHz～862MHz, 2.3GHz～2.4GHz, 3.4GHz～4.2GHz and 4.4GHz～4.99GHz frequency range) of LTE-A more, path loss and all bigger above higher frequency band of 3.4GHz of penetration loss.Yet; Also there is following problem in heterogeneous network: (1) is for the new transmitting node of introducing; In data link layer and network layer, need design relevant with it common signal channel, control channel, protocol architecture and physical process, increased the complexity of system design to a certain extent; (2) owing in original cell range, introduced new transmitting node, be equivalent to introduce new interference source, therefore will bring bigger challenge to the interference coordination of the minizone of physical layer.

Than LTE Release-8.0 or LTE Release-9.0 system, because the introducing of heterogeneous network, the cochannel interference problem in the LTE-A system becomes more outstanding.In heterogeneous network, cochannel disturbs and is mainly derived from following interference scene: the interference scene that network topology change caused that a lot of dissimilar sub-districts cause is introduced in (1) in a traditional cellular network.Disturb under the scene at this, for the base station of macro cells, being equivalent to inside, sub-district has increased many " cell edges ", has increased the complexity of interference coordination in the whole sub-district; For closed user group (CSG) base station; Because it is deployed with very big randomness; Small area shape is irregular, and the coverage of two different Home eNodeB (HeNB) possibly have overlapping significantly, and coordinates interference also is a new problem between different Home eNodeB.(2) the different interference scenes that caused of dissimilar cell base station transmitting powers.Disturb under the scene at this; Dissimilar base station transmitting powers differ greatly; The UE that in a Pico cell sub-district or femtocell sub-district, communicates by letter receive come from Pico cell or femtocell emitted power maybe be less than the transmitting power that comes from macrocell base stations, thereby the UE in Pico cell sub-district or the femtocell sub-district receives very strong interference.(3) the interference scene that is caused is switched in the minizone.Particularly, in LTE Release-8.0, it is its size that receives power that UE selects the standard of access sub-district, selects to be linked into the high-power base station of reception, promptly only confirms to insert which base station according to the quality of down link.And for heterogeneous network; Though UE is within the rational coverage in Pico cell sub-district or femtocell sub-district; But its receive from the power of Pico cell or femtocell still less than power from macrocell base stations, particularly all the more so for UE near cell edge.If still according to the standard of LTE Release-8.0, the coverage of microcellular can be very little so, do not reach the purpose of design.Consider from the angle of up link weigh UE select to insert its path loss of microcellular can be littler, if the size of access path loss in the up link as the access standard, the coverage of microcellular will enlarge.Therefore, in LTE-A, with the size of access path loss in the up link as the access standard.But thus, the transmitting power of UE and base station all can increase in microcellular, and this can cause very big interference to other users in the macro cells.

Below referring to figs. 2 and 3 two kinds of main ICI that describe in the heterogeneous network.Fig. 2 shows the sketch map of the ICI between macro cells and Femto cell in the heterogeneous network of LTE-A.The heterogeneous network of macro cells and Femto cell coexistence (below; Brief note is for " Macro-Femto heterogeneous network ") in, the cochannel of control channel disturbs and mainly contains following three factors and produce: HeNB230 send on the down control channel descending control signaling give HUE 233 and cause to be in HeNB 230 cell edges or near MUE 211 produce descending cochannel and disturb; MUE 212 sends upstream control signaling and gives MeNB 210 on ascending control channel; HUE 234 sends upstream control signaling and gives HeNB 231 on ascending control channel simultaneously; So, the upstream control signaling of MUE 212 produces the cochannel interference to the upstream control signaling of HUE 234; Send descending control signaling in the HUE 235 at HeNB 232, HeNB 231 sends downlink signalings and disturbs to HUE 234 and to HUE 235 generation cochannels.

Fig. 3 shows the sketch map of the ICI between macro cells and picocell in the heterogeneous network of LTE-A.The heterogeneous network of macro cells and picocell coexistence (below; Brief note is " Macro-Pico heterogeneous network ") in; Based on the cell cooperative of path loss (for example; Based on the Reference Signal Received Power RSRP of deviation report) can improve the quality of PUE 321 ascending control channels, but the cochannel that has increased the weight of to be in the down control channel of the PUE 321 at wireless area edges under the PeNB 320 disturbs.Can list of references 3GPP TS 36.814 about the more detailed information of the ICI between macro cells and Femto cell, repeat no more here.

For the cochannel that overcomes in the heterogeneous network disturbs (ICI); LTE-A mainly adopt two roughly the same channel disturbance eliminate or (ICIC, inter-cell interference cancellation or coordination) the ICIC method of method: Rel-8/9 and the ICIC method of Non-Rel-8/9 of coordination.Also can be divided into based on the mechanism of CA with not based on the mechanism of CA based on carrier aggregation according to whether.The emphasis of LTE-A research at present is not based on the ICIC method of CA, sees document 3GPPTR36.814 for details.When the ICIC mechanism of using not based on CA, the LTE-A system adopts diverse ways respectively to the macro cells and the cochannel interference of cochannel interference, macro cells and the Pico cell minizone of Pico cell minizone.Particularly; (1) be configured to coexist in macro cells and Pico cell sub-district (below; Brief note is " Macro-Pico configuration ") and need not range expansion (RE; Range expansion) in the scheme, there is not the ICIC problem in the control channel of down link, and the data channel of down link can adopt the ICIC technology consistent with LTE Release-8.0/Release-9.0 to eliminate ICI; (2) dispose and need not range expansion (RE at Macro-Pico; Range expansion) in the scheme, in up link, use power control or the power setting mechanism of LTE Release-8.0/Release-9.0 to come control channel and data channel are carried out ICIC; (3) in Macro-Pico configuration and need range expansion (RE; Range expansion) in the scheme, hour there is not the ICIC problem in the control channel of down link in deviate (bias), and there is serious ICI in the control channel of down link when deviate (bias) is big; At this moment; Can consider to adopt the enhancement mode ICIC method outside the LTERelease-8.0/Release-9.0, and, need further consider optimum deviate (bias); (4) in Macro-Pico configuration and need range expansion (RE; Rangeexpansion) in the scheme; In up link, can use power control or the power setting mechanism of LTERelease-8.0/Release-9.0 to come control channel and data channel are carried out ICIC; (5) be configured to coexist in macro cells and femtocell sub-district (below; Brief note is " Macro-Femto configuration ") or the coexistence of a plurality of femtocells sub-district (below; Brief note is for " Femto-Femto configuration ") situation under; When CSG and/or Non-CSG subscriber equipment during near the femtocell sub-district, cochannel disturbs and produces.At this moment; The ICIC means that LTE Release-8.0 or LTE Release-9.0 system are adopted have been not enough to eliminate the cochannel interference of control channel; Therefore; Need to seek the ways and means of some effective more enhancement mode cochannel interference eliminated or coordination (eICIC, ehanced inter-cell interference cancellation or coordination).

The inventor finds to a few eka-osmium ICIC mechanism below the LTE-A cellular system Macro-Femto heterogeneous network configuration existence through investigation and analysis to the prior art document:

(1) time domain eICIC mechanism

In the LTE-A system, the cochannel that the main method through time division multiplexing (TDM, time-division multiplexing) of the time domain eICIC of heterogeneous network mechanism overcomes between different districts disturbs.Mainly comprise: in time domain, configuration MBSFN subframe (MBSFN subframe), dispose almost gap frame (Almost blank subframe), dispose pseudo-sub-frame of uplink (Fake uplink subframe), time shift time domain approachs such as (time shifting).Wherein, the cardinal principle of this several method is following:

The method of configuration MBSFN subframe-promptly; (for example make the invasion sub-district; The femtocell sub-district) control channel is configured in 1 OFDM symbol of MBSFN subframe, and (Common Referencen Signal CRS) is distributed in this OFDM symbol to make the generalized reference signal.Like this, the cochannel interference meeting between the control channel of the control channel of invasion sub-district and sacrifice sub-district (for example, macro cells) will reduce greatly;

Dispose almost the method for gap frame-promptly; (for example make the invasion sub-district; Do not have control information to distribute on the control domain of the control channel gap frame femtocell sub-district), thereby invasion sub-district and the cochannel interference between the control channel of sacrificing sub-district (for example, macro cells) are greatly eliminated.But in order to accomplish and make the channel condition information (CSI of down channel to the covering of whole invasion sub-district; Channel state information) measurement is normally carried out; The control domain of gap frame and data field all have CRS to distribute, and like this, the interference that CRS produces exists all the time;

Dispose the method for pseudo-sub-frame of uplink-promptly, as uplink frame, be used to transmit ULACK/NACK information to the downlink frame of invasion sub-district;

Time shift method-promptly staggers the control channel of invasion sub-district and the control channel of sacrificing the sub-district in time, disturbs (referring to document: 3GPP LTE motion R1-104308 thereby make invasion sub-district and the control channel of sacrificing the sub-district not produce cochannel; Huawei, Understanding the Time Domain eICIC Schemes, 3GPP TSG RAN WG1 meeting#62; Madrid; Spain, August 23-August 27,2010; 3GPP LTE motion R1-104345, CATT, Further Analysis on Time Domain Solutions in Het-Net, 3GPP TSG RAN WG1 meeting#62, Madrid, Spain, August 23-August 27,2010).

But; There are some problems relevant with the backwards compatibility of the UE of Rel-8/9 in the TDM method; For example inaccurate Radio Link is measured (RLM, radio link measurement), channel feedback, cochannel decoding failure, insecure control channel/system information broadcast/problems such as PCH reception.These problems need further be investigated and assess in the LTE-A heterogeneous network.Therefore, time domain eICIC method can not satisfy LTE-A fully to the cochannel interference eliminated of Macro-Femto minizone control channel or the demand of coordination.

(2) frequency domain eICIC mechanism

In the LTE-A system, the cochannel that the main method through frequency division multiplexing (FDM, frequency-division multiplexing) of the frequency domain eICIC of heterogeneous network mechanism overcomes between different districts disturbs.Mainly comprise following two kinds of methods:

PDCCH shrinks (shrinking)-promptly, and the different frequency range that the macro cells of heterogeneous network and femtocell sub-district take system bandwidth respectively comes control channel.Thereby, can avoid the ICI of PSS/SSS/PBCH channel;

FDMA-promptly, the macro cells of heterogeneous network and femtocell sub-district adopt the method for frequency division multiplexing to come control channel in the whole system bandwidth.Thereby the ICI that can avoid the PDCCH channel is (referring to document: 3GPP LTE motion R1-102984, Philips; Mitigation of Control Channel Interference, 3GPP TSG RAN WG 1Meeting#61, Montreal; Canada, 12th-16th May 2010; 3GPP LTE motion R1-103126, Huawei, Enhanced ICIC for control channels to support HetNet, 3GPP TSG RAN WG1 meeting#61, Montreal, Canada, May 10-14,2010).

But also there are some problems relevant with the backwards compatibility of the UE of Rel-8/9 in the FDM method, and promptly the UE of Rel-8/9 can't identify in heterogeneous network through the control channel after the FDM processing.Therefore, frequency domain eICIC method can not satisfy LTE-A fully to the cochannel interference eliminated of Macro-Femto minizone control channel or the demand of coordination.

(3) machine-processed based on the eICIC of power control or power setting

In the LTE-A system, mainly the cochannel that is in femtocell cell edge or near MUE being disturbed of heterogeneous network through the transmitting power of the down control channel of femtocell sub-district being carried out descending control signaling that power setting (power setting) or power control (power control) reduces the femtocell sub-district based on the eICIC mechanism of power control or power setting.

Advantage based on the eICIC mechanism of power control or power setting is backstage signaling (backhaul signaling) backward compatibility fully, and shortcoming is to need to consider how to handle the measurement of HeNB end (referring to document: 3GPP LTE motion R1-104414, Alcatel-Lucent; Alcatel-Lucent Shanghai Bell; HeNB Power Setting Specifications, 3GPP TSG RAN WG1Meeting#62, Madrid; Spain, 23 ^Rd-27th Aug.201; 3GPP LTE motion R1-104626, Samsung, Discussion on DL Power Setting for Heterogeneous Networks, 3GPP TSG RAN WG1 Meeting#62, Madrid, Spain, 23rd-27thAug.2010).

Because the descending power setting of femtocell sub-district or control are based on the measurement of HeNB end; Therefore; The measurement of the HeNB end more complicated that will become, and the mechanism of power setting or the control cochannel that can only reduce heterogeneous network disturbs and can not avoid cochannel to disturb fully.Therefore, the eICIC mechanism based on power control or power setting can not satisfy LTE-A fully to the cochannel interference eliminated of Macro-Femto minizone control channel or the demand of coordination.

(4) machine-processed based on the eICIC of access rights

In the LTE-A system, the eICIC mechanism based on access rights of heterogeneous network mainly lets HeNB relax the access rights to Non-CSG UE, promptly Non-CSG UE can in the HeNB sub-district, carry out all or part of HUE function (referring to document: 3GPP LTE motion R1-104484; Texas Instruments; HeNB Power Control and Radio Link Monitoring Aspects, 3GPP TSG RAN WG1 Meeting#62, Madrid; Spain, 23 ^Rd-27th Aug.201).

But; Though HeNB relaxes the way of the access rights of Non-CSG UE has been brought high quality services for Non-CSG user and avoided Non-CSG UE to get into the CSG network and the cochannel that brings disturbs, the privacy of having damaged the CSG network and fail safe and the capacity of having deepened the HeNB network are born.Therefore, the eICIC mechanism based on access rights can not be adopted by users.

(5) the eICIC mechanism of type R-PDCCH (R-PDCCH like)

In the LTE-A system, the eICIC mechanism of the class R-PDCCH of heterogeneous network mainly (for example, PDSCH) goes up the new PDCCH zone of definition, is used to transmit the PDCCH signaling of sacrificing the sub-district in the data area of system bandwidth.This is a kind of PDCCH expanding mechanism in essence, is similar to the PDCCH design of adopting relaying, therefore; The eICIC of type of being named as R-PDCCH mechanism is (referring to document: 3GPPLTE motion R1-103046, Samsung, PDCCH Extension for ICIC and Capacity Gains; 3GPP TSG RAN WG1 #61, Montreal, Canada; May 10-14,2010).

But the eICIC mechanism of type R-PDCCH needs the UE of Rel-10 to detect the PDCCH and the data field extension of a field PDCCH of the control area of the system bandwidth of sacrificing the sub-district, thereby has increased the complexity that PDCCH handles.In addition, Rel-8/9UE is owing to the PDCCH signaling that can not discern expansion, thereby the problem of generation backwards compatibility.

(6) other eICIC mechanism

In heterogeneous network, other eICIC mechanism comprise based on the eICIC of range expansion (RE) mechanism, based on the eICIC mechanism of load indication, based on the eICIC mechanism of FDM+RE etc.Wherein, control descending ICIC through adjusting deviate (bias), be mainly used in the Pico cell sub-district (referring to document: 3GPP LTE motion R1-104514 based on the eICIC of RE mechanism is main; Huawei, Analysis of Range Extension in Het-Net Scenarios, 3GPP TSG RAN1#62; Madrid; Spain, August 23-27,2010); EICIC mechanism based on load indication is mainly come control IC I through the load of control PDCCH, is used for Pico cell sub-district or femtocell sub-district (referring to document: 3GPP LTE motion R1-103861, Intel Corporation (UK) Ltd; Evaluation of PDCCH Interference Mitigation in LTE-A; 3GPP RAN1#61bis, Dresden, Germany; Jun.28-Jul.2,2010); Mainly come control IC I based on the eICIC of FDM+RE mechanism, be used for Pico cell sub-district or femtocell sub-district (referring to document: 3GPP LTE motion R1-104714, Motorola through the method for FDM and RE; FDM Range Extension in Open-access Heterogeneous Networks; 3GPP TSG RAN1#62, Madrid, Spain; August 23-27,2010).

Fig. 4 shows the sketch map of eICIC mechanism of control channel of the Macro-Femto heterogeneous network of LTE-A.As indicated above; The eICIC mechanism of the control channel of Macro-Femto heterogeneous network comprises several different methods such as time domain eICIC mechanism, frequency domain eICIC mechanism; Wherein among Fig. 4 (a) almost the gap frame weaken (Time offset+PDSCH muting) with (b) time migration+PDSCH and belong to time domain eICIC mechanism; (c) PDCCH shrinks the eICIC mechanism that belongs to frequency domain, and (d) type R-PDCCH belongs to the PDCCH mechanism of expansion.Details about existing eICIC method can will repeat no more with reference to 3GPP motion R1-104064 here.

In sum; In view of the present existing in the world method to enhancement mode cochannel interference eliminated in the heterogeneous network or coordination comprehensively with concrete; Can't satisfy LTE-A fully to the cochannel interference eliminated of Macro-Femto minizone control channel or the demand of coordination; There are problems such as backwards compatibility, are necessary to seek method, base station and the subscriber equipment of eICIC in a kind of comprehensive, efficient and simple and practical heterogeneous network.

Summary of the invention

As stated; To the definite mechanism of supporting the configuration of heterogeneous network and having determined to introduce the ICIC of enhancement mode of 3GPP LTE-A, the object of the present invention is to provide method and the relevant base station and the subscriber equipment of enhancement mode cochannel interference eliminated in a kind of heterogeneous network.Through disturbing with the cochannel that reduces or eliminates macrocell and femtocell minizone, thereby make eICIC mechanism efficient more and flexible to the ICIC method of the new enhancement mode of the control channel design of femtocell sub-district or home network.Than traditional method, the method and system that the present invention proposes has comprehensively, efficient, simply, the characteristics that are easy to realize.Method of the present invention and relevant base station and subscriber equipment can also be applied to other heterogeneous networks.

According to first scheme of the present invention, the method for enhancement mode cochannel interference eliminated in a kind of heterogeneous network has been proposed, comprising: HeNB confirms the distribution situation of HUE in the HeNB sub-district; HeNB is according to the distribution situation of determined HUE, and selection is suitable for the cochannel interference cancellation scheme of the distribution situation of determined HUE; And HeNB carries out selected cochannel interference cancellation scheme.

According to alternative plan of the present invention, the method for enhancement mode cochannel interference eliminated in a kind of heterogeneous network has been proposed, comprising: when the MUE in residing in the HeNB sub-district got into connection mode, the core net under HeNB or the HeNB judged whether MUE is CSG UE; If said MUE is CSG UE, HeNB and MUE establish a communications link; And if said MUE is not CSG UE, HeNB carries out the cochannel interference eliminated.

According to third party's case of the present invention, the method for enhancement mode cochannel interference eliminated in a kind of heterogeneous network has been proposed, comprising: MeNB detect the MUE be in connection status move to the HeNB sub-district the edge or near; Core net under MeNB or the MeNB judges whether MUE is CSG UE; If MUE is CSG UE, MeNB sends MUE to HeNB and switches to the required information of HeNB; And if MUE is not CSG UE, MeNB sends false handover information to HeNB, and HeNB carries out the cochannel interference eliminated according to said false handover information.

According to cubic case of the present invention, a kind of HeNB that is used for carrying out at heterogeneous network enhancement mode cochannel interference eliminated has been proposed, comprising: the HUE distribution situation is confirmed the unit, is used for confirming the distribution situation of HeNB sub-district HUE; Cochannel interference cancellation scheme selected cell is used for selecting to be suitable for according to the distribution situation of determined HUE the cochannel interference cancellation scheme of the distribution situation of determined HUE; And cochannel interference cancellation scheme performance element, be used to carry out selected cochannel interference cancellation scheme.

According to the 5th scheme of the present invention; A kind of HeNB that is used for carrying out at heterogeneous network enhancement mode cochannel interference eliminated has been proposed; Comprise: MUE determined property unit is used for when the MUE that resides at the HeNB sub-district gets into connection mode, judging whether this MUE is CSG UE; Signaling and data transmission unit, being used at MUE is under the situation of CSG UE, sends to be used between HeNB and MUE, establish a communications link required signaling and data; And cochannel interference cancellation scheme performance element, being used at MUE is not under the situation of CSG UE, carries out the cochannel interference eliminated.

According to the 6th scheme of the present invention, a kind of HeNB that is used for carrying out at heterogeneous network enhancement mode cochannel interference eliminated has been proposed, comprising: the background communication interface unit is used for switching required information or false handover information from MeNB reception carrying out sub-district; Signaling and data transmission unit are used for receiving from MeNB at the background communication interface unit and carry out the sub-district when switching required information, send to be used to make MUE to switch to signaling and the data of HeNB from MeNB; And cochannel interference cancellation scheme performance element, be used at the background communication interface unit carrying out the cochannel interference eliminated when MeNB receives false handover information.

According to the 7th scheme of the present invention; A kind of MeNB that heterogeneous network carries out enhancement mode cochannel interference eliminated that is used for being supported in has been proposed; Comprise: MUE measurement report processing unit, be used for measurement report according to MUE, detect the MUE be in connection status move to the HeNB sub-district the edge or near; Communications interface unit is used for sending information to HeNB, make HeNB can based on said information know said MUE move to the HeNB sub-district the edge or near, and the distribution situation of HUE in definite HeNB sub-district.

According to all directions of the present invention case; A kind of MeNB that heterogeneous network carries out enhancement mode cochannel interference eliminated that is used for being supported in has been proposed; Comprise: MUE measurement report processing unit, be used for measurement report according to MUE, detect the MUE be in connection status move to the HeNB sub-district the edge or near; MUE determined property unit is used to judge whether said MUE is CSG UE; Communications interface unit, being used at MUE is under the situation of CSG UE, sends MUE to HeNB and switches to the required information of HeNB, and be not under the situation of CSG UE at MUE, sends false handover information to HeNB.

According to the 9th scheme of the present invention; A kind of MUE that heterogeneous network carries out enhancement mode cochannel interference eliminated that is used for being supported in has been proposed; Comprise: the district reselecting unit; Be used for the MUE that is in idle pulley move to the HeNB sub-district the edge or near the time carry out district reselecting, make MUE reside in the HeNB sub-district; And signaling and Data Receiving unit; Be used for when the MUE that resides in HeNB gets into idle pulley, receiving broadcasting and the paging information that HeNB sends, and reside in receive when MUE among the HeNB gets into connection mode send under the situation that HeNB is CSG UE at MUE, required signaling and data establish a communications link between HeNB and MUE.

According to the tenth scheme of the present invention; A kind of MUE that heterogeneous network carries out enhancement mode cochannel interference eliminated that is used for being supported in has been proposed; Comprise: signaling and Data Receiving unit; Be used to receive that HeNB sends, be used to make MUE to switch to signaling and the data of HeNB from MeNB, and after MUE switches to HeNB from MeNB, receive signaling and data from HeNB; And signaling and data transmission unit, be used for after MUE switches to HeNB from MeNB, sending signaling and data to HeNB.

Description of drawings

Fig. 1 shows the sketch map of the heterogeneous network topological structure of LTE-A;

Fig. 2 shows the sketch map of ICI of control channel of the Macro-Femto network of LTE-A;

Fig. 3 shows the sketch map of ICI of the Macro-Pico network of LTE-A;

Fig. 4 shows the machine-processed sketch map of control channel eICIC of the Macro-Femto network of LTE-A;

Fig. 5 shows the main cause that the ICI on the control channel of Macro-Femto network of LTE-A produces;

Fig. 6 shows the sketch map that the control channel of the Macro-Femto network of LTE-A distributes;

Fig. 7 shows the sketch map according to the application scenarios of the eICIC method of first embodiment of the invention;

Fig. 8 shows the sketch map of the backstage interface of LTE/LTE-A system;

Fig. 9 shows the flow chart according to the eICIC method of first embodiment of the invention;

Figure 10 shows the sketch map of LTE mobile management;

Figure 11 shows the sketch map of UE measurement report;

Figure 12 shows the sketch map of backstage signaling;

Figure 13 shows the sketch map based on the interface notice signaling mechanism of eating dishes without rice or wine;

Figure 14 shows the sketch map based on SRS mechanism;

Figure 15 shows the flow chart according to the eICIC method of second embodiment of the invention;

Figure 16 shows based on the eICIC scheme of gap frame and MBSFN subframe almost;

Figure 17 shows the sketch map according to the application scenarios of the eICIC method of third embodiment of the invention;

Figure 18 shows the flow chart according to the eICIC method of third embodiment of the invention;

Figure 19 shows the sketch map of district reselecting;

Figure 20 shows the sketch map of call signaling;

Figure 21 shows the sketch map based on the eICIC scheme of time migration (time shift);

Figure 22 shows the sketch map according to the application scenarios of the eICIC method of fourth embodiment of the invention;

Figure 23 shows the flow chart according to the eICIC method of fourth embodiment of the invention;

Figure 24 shows the sketch map based on the eICIC scheme of TDM and power control or power setting;

Figure 25 shows the sketch map according to the application scenarios of the eICIC method of fifth embodiment of the invention;

Figure 26 shows the flow chart according to the eICIC method of fifth embodiment of the invention;

Figure 27 shows the sketch map of DRX configuration;

Figure 28 shows the sketch map of realizing according to the hardware capability of MeNB of the present invention;

Figure 29 shows the sketch map of realizing according to the hardware capability of MUE of the present invention;

Figure 30 shows the sketch map of realizing according to the hardware capability of HeNB of the present invention; And

Figure 31 shows the sketch map of realizing according to the hardware capability of HUE of the present invention.

Embodiment

To a preferred embodiment of the present invention will be described in detail, in the description process, omitted unnecessary details and function for the present invention with reference to the accompanying drawings, obscured to prevent understanding of the present invention caused.At length set forth performing step of the present invention for clear, provide some specific embodiments of the present invention below, be applicable to LTE, LTE-A, 4G cellular communication system.Need to prove; Given embodiment only is illustrative and nonrestrictive; Though be that example has been described example embodiment of the present invention promptly with the eICIC in the LTE-A network; But the invention is not restricted to the application described in the embodiment, and also applicable to other heterogeneous network wireless communication systems.

According to the description of background technology, ICI has multiple source in the heterogeneous network, like the ICI of Macro-Pico heterogeneous network and the ICI of Macro-Femto heterogeneous network.And every kind of ICI source has the multiple origin cause of formation, as described 3 kinds of origin causes of formation of the ICI between the Macro-Femto heterogeneous network with reference to figure 2.Wherein, described in background technology, each item mechanism among the LTE Release-8.0/Release-9.0 can properly be eliminated the ICI in the Macro-Pico heterogeneous network.Therefore, current main task is that searching can be eliminated the method for the ICI in the Macro-Femto heterogeneous network more efficiently, i.e. the method for eICIC in the Macro-Femto heterogeneous network.For realizing this target better, at first need clearly cause the main cause of the ICI in the Macro-Femto heterogeneous network and overcome the main challenge that this main cause faces.

Fig. 5 shows the main cause that the ICI on the control channel of Macro-Femto network of LTE-A produces.In the Macro-Femto heterogeneous network; As shown in Figure 5; It is the interference that comes from the descending control signaling that HeNB 430 sends that is in that HeNB 430 cell edges or near MUE 411 suffer that main cochannel disturbs; And that the down control channel that MeNB 410 sends can not produce the interference of disturbing or producing to HUE 431 is very little and can ignore, and this is because HUE431 is in the coverage of HeNB 430, satisfies the Signal to Interference plus Noise Ratio (SINR of HUE 431; The ICI of the MeNB410 sub-district that index signal to interference and noise ratio), so HUE 431 receives is controlled fully and can be ignored.In addition, Fig. 5 has not only provided cochannel and has disturbed the main cause that produces, and the CRS that demonstrates CRS and HeNB 430 sub-districts of MeNB 410 sub-districts also can produce cochannel each other and disturb, and this also designs the CRS of HeNB 430 and has proposed challenge.

In the 62nd meeting of LTE RAN1; Design about the eICIC of Maro-Femto heterogeneous network; The consistent viewpoint that the tame mechanism of each of participant reaches is: the scheme of the eICIC of Macro-Femto heterogeneous network need be considered backward compatibility issues, and promptly the UE of Release-8.0/9.0 can adopt the scheme of eICIC and can not produce additional overhead; The scheme of the eICIC of Macro-Femto heterogeneous network should adopt identical mechanism to FDD (FDD, frequency division duplexing) system and time division duplex (TDD, time division duplexing) system; The scheme of the eICIC of Macro-Femto heterogeneous network does not preferably need backstage (Backhaul) coordination mechanism, and X2 interface and S1 interface preferably need not be used for the backstage cooperation.Therefore; If the frame structure of the HeNB among employing Fig. 5, so, the CRS of HeNB 430 can produce ICI to the CRS of MeNB 410; For the ICI that avoids CRS takes place; Can consider the method for almost gap frame mentioned above, but the method has limited the backwards compatibility of Release-8.0/9.0UE, promptly Release-8.0/9.0UE can not discern the subframe that does not have CRS.This be again eICIC in the design Macro-Femto heterogeneous network method the challenge that will face.

In sum; Main purpose of the present invention is exactly: through the design of the control channel of wireless area under the reference MeNB; Control channel to the femtocell sub-district designs, changes, handles, thereby reduces or eliminate the femtocell sub-district cochannel of the control channel that is in femtocell cell edge or near MUE and causes is disturbed.Fig. 6 shows the sketch map that the control channel of wireless area distributes under the MeNB of LTE-A.As shown in Figure 6, control channel mainly comprises PDCCH, PCFICH, PHICH etc.Though Fig. 6 does not illustrate the distribution of other control channels such as PBCH, SCH, one of ordinary skill in the art will recognize that eICIC method of the present invention is equally applicable to other control channels such as PBCH, SCH.

[first embodiment]

The first embodiment of the present invention is the method for eICIC in a kind of Macro-Femto heterogeneous network.Fig. 7 shows the sketch map according to the application scenarios of the eICIC method of first embodiment of the invention.As shown in Figure 7; Whole heterogeneous network comprises macrocell base stations MeNB 510, femtocell HeNB 530, macrocellular subscriber equipment MUE 511, home consumer device HUE 531, HUE 532; Wherein, MeNB 510 is serving BSs of MUE 511, and HeNB 530 is serving BSs of HUE531 and HUE 532, can carry out backstage (Backhaul) between MeNB 510 and the HeNB 530 and communicate by letter.

Background communication relates to the structure of LTE Access Network.The structure of LTE Access Network is described at present.The LTE Access Network only is made up of eNB; Be provided to the packet switched core network (MME/S-GW of UE; Be the gateway of mobile management entity, mobility management entitygateway) chain of command connects through X2 interface between the eNB to the agreement terminating point of user plane.And between two different e NB of needs communication, there is X2 interface all the time, and, can has X2 interface between source eNB and the target eNB in order to support to be in the switching between the different e NB under the connection status.Be connected through the S1 interface between LTE Access Network (eNB) and the core net (MME/S-GW), the S1 interface is supported the connected mode of multi-to-multi, and therefore, the S1 interface is present in: (HeNB-GW is HeNB-gateway) and between the core net (MME/S-GW) for the gateway of HeNB; Between HeNB and the HeNB-GW; Between LTE Access Network (eNB) and the core net (MME/S-GW).Consider developing rapidly of heterogeneous network, estimate between HeNB and core net (MME/S-GW), also will introduce the S1 interface in the future.

Fig. 8 shows the backstage interface sketch map of LTE/LTE-A system; MME/S-GW1 and MME/S-GW2 all are core net of LTE/LTE-A; MeNB 510 and MeNB 512 all are macro base stations of Access Network; Be connected through X2 interface between macrocell base stations MeNB 510 and the macrocell base stations MeNB 512, Access Network MeNB 510 and Access Network MeNB 512 communicate through the S1 interface with core net MME/S-GW1 and MME/S-GW2 respectively.HeNB 530 and HeNB 533 are base stations of the CSG of family network, and all the gateway HeNB-GW with HeNB passes through the S1 interface communication.In sum, backstage (Backhaul) communication can realize through X2 interface, two kinds of passages of S 1 interface at least.But; Consider that the affiliated home network of LTE regulation HeNB does not adopt X2 interface to carry out backstage (Backhaul) with the macro cells under the MeNB and communicates by letter; Therefore, in Fig. 7, can exchange background information through the S1 interface of MeNB 510 and the S1 interface of HeNB 530.At this moment, if no S1 interface between HeNB 530 and the core net MME/S-GW, HeNB 530 need be through the gateway HeNB-GW of core net MME/S-GW and HeNB with MeNB 510 exchange background information; If S 1 interface is arranged between HeNB 530 and the core net MME/S-GW, HeNB 530 only need pass through core net MME/S-GW with MeNB 510 exchange background information.

Below, with reference to Fig. 9 the flow chart according to the method for eICIC in the heterogeneous network of first embodiment of the invention is described.As shown in Figure 9, this method originates in step S100.In this step, when MUE 511 is in connection mode and moves to the edge of HeNB 530 sub-districts or when neighbouring, MUE511 sends to MeNB 510 with measurement report.

Here, Figure 10 shows the sketch map that UE is in the LTE mobile management under the connection status.List of references 3GPP TS 36.300, LTE mobile management show as the sub-district and switch (Handover) under UE is in connection status.The detailed process that switch the sub-district is following: UE sends measurement report (Measurement report) message and gives source eNB; If source eNB needs Target Wireless access network node (RAN; Radio access network node) accomplishes the sub-district and switch (Handover); Then eNB " switch and prepare (Handover the preparation) " information of sending is given target RAN, and target RAN sends " switching command (Handover command) " and gives source eNB; Source eNB sends " from the movement directive (MobilityFromEUTRACommand) of core net " message and gives UE; After UE receives MobilityFromEUTRACommand information, be connected to target RAN, like this, " switch and accomplish (HANDOVER COMPLETE) " or " connect and set up (Connectionestablishment) " accomplishes.

Figure 11 shows the sketch map of UE measurement report (Measurement report).List of references 3GPP TS 36.300, Access Network (eNB) can be configured the measurement report information of UE through employing wireless resource control (RRC, radioresource control) signaling.The RRC signaling comprises the configuration object of UE measurement report: measurement target (be UE measure content), for example the list (white list or black list) of carrier frequency, a plurality of wireless areas that UE monitored, based on the carrier deviation (Cell-specific offset) of sub-district; Report configuration, the i.e. trigger event of UE measurement report, the threshold value of Reference Signal Received Power (RSRP, reference signalreceived power), the quantity of sub-district that UE monitors etc.; Measure identification, i.e. the identifier that measurement target and report disposed (ID, identity); Quantitative structure and measurement clearance.

Then, process advances to step S101, and in this step, MeNB 510 receives the measurement report that MUE511 sends, and moves to edge or near this incident of HeNB sub-district to HeNB 530 notice MUE 511.MUE 511 moves to the edge of HeNB sub-district or near the notice of this incident can adopt multiple advice method.

Figure 12 shows a kind of sketch map of the advice method based on backstage (Backhaul) signaling.Wherein, MeNB 510 through the backstage signaling to HeNB 530 notice MUE 511 the edge of HeNB sub-district or near this incident can pass through below several kinds of interface modes realize:

(1) according to list of references 3GPP TS 36.300, MeNB communicates by letter with core net MME/S-GW through S 1 interface, and HeNB communicates by letter with gateway HeNB-GW through S 1 interface.Therefore; The signaling of MeNB 510 definition can arrive core net MME/S-GW through S 1 interface; Arrive the gateway HeNB-GW of HeNB then through the S1 interface, at last through the S1 interface to HeNB 530 notice MUE 511 the edge of HeNB sub-district or near this incident, shown in figure 12;

(2) if adopt X2 interface between MeNB 510 and the HeNB 530, then the signaling of MeNB definition can be directly to HeNB 530 notify MUE 511 in the HeNB sub-district the edge or near this incident, shown in figure 12;

(3) if HeNB 530 can directly visit core net MME/S-GW1, the S1 interface that then signaling of MeNB510 definition can be through core net MME/S-GW to HeNB 530 notice MUE 511 the edge of HeNB sub-district or near this incident, shown in figure 12.

Figure 13 shows the sketch map based on the advice method of air interface signaling.The proposition of this mode comes from communicating by letter between the LTE RAN1 MeNB that the 62nd time meeting determined that holds according in August, 2010 and the HeNB and does not adopt the conclusion (referring to 3GPP standardization motion R1-105083) of backstage cooperation (X2 interface or S 1 interface), and the method that relates to X2 interface or S 1 interface all is not supported in the discussion of the 62nd meeting of LTE RAN1.In view of this, MeNB 510 can through eat dishes without rice or wine interface to HeNB 530 notice MUE 511 the edge of HeNB sub-district or near this incident.

Particularly; Air interface can define the signaling of 1 bit; And through downlink broadcast signaling (PBCH), synchronous signaling (SCH), descending control signaling (PDCCH), based on the RRC signaling of physical down data channel (PDSCH) (for example; Can adopt the configuration of mac frame), call signaling (Paging) sends from MeNB 510, and HeNB 530 can receive these signalings.In heterogeneous network; To FDD and TDD system two kinds of implementations are arranged respectively: in the FDD system; The downlink frame of MeNB 510 adopts and the same frequency range of HeNB 530 uplink frame; Like this, HeNB 530 just can receive the signaling of channels such as PBCH/SCH that MeNB sends, PDCCH, PDSCH, in heterogeneous network, adopts the method for carrier aggregation to be easy to realize that the downlink frame of MeNB510 adopts and the same frequency range of uplink frame of HeNB 530.For example, the downlink frame of MeNB 510 adopts the uplink frame of CC1 frequency range, MeNB 510 to adopt the downlink frame of CC2 frequency range, HeNB 530 to adopt the uplink frame of CC3 frequency range, HeNB 530 to adopt CC1.In the TDD system; MeNB 510 and HeNB 530 are not exclusively synchronous; The descending transmission life period deviation of the descending transmission of MeNB 510 and HeNB530 then, for example, MeNB 510 HeNB 530 when sending downlink frame can receive uplink frame; Like this, HeNB 530 just can receive the signaling of channels such as PBCH/SCH that MeNB 510 sends, PDCCH, PDSCH.

To sum up; The principle of preceding two kinds of advice methods be MeNB 510 through interface (comprising backstage interface X2 or S1 and/or air interface PBCH/SCH, PDCCH, RRC, Paging) with direct or indirect mode signaling (be defined as incident, promptly MUE 511 the edge of HeNB sub-district or near) notice gives HeNB 530.

In addition, for to HeNB 530 notice MUE 511 the edge of HeNB sub-district or near this incident, can also adopt the advice method among Figure 14.Shown in figure 14; MeNB 510 (is defined as the uplink detection reference signal (SRS of MUE to signaling through backstage interface (X2 or S1) and/or air interface with direct or indirect mode; Sounding reference signal) configuration information (configuration)) notice is given HeNB 530; After HeNB 530 receives the SRS configuration information of MUE 511 through backstage interface (X2 or S1); The RSRP that possesses the SRS that the HeNB 530 of the ability that detects the SRS that MUE 511 sends can send according to detected MUE 511, judge MUE 511 whether the edge of HeNB 530 or near.

The concrete realization mechanism of this advice method comprises: at first the serving BS MeNB 510 of MUE 511 self receives and detects the SRS that MUE 511 sends; MeNB 510 is transferred to HeNB530 to the SRS configuration information of MUE 511 through backstage mentioned above interface and/or air interface.The SRS configuration information of MUE 511 comprises that bandwidth, the SRS of SRS send the cycle (Period), send duration (Duration), repeat factor (RPF; Repetition factor), transmitting power (being the ratio of transmitting power with the transmitting power of DM RS of SRS), residing subframe, frequency spectrum comb, the cyclic shift (CS, cyclidc shift) of sequence, the numbering of CAZAC sequence etc.; HeNB 530 receives the SRS configuration information of MeNB through the MUE 511 of backstage interface and/or air interface transmission; HeNB 530 combines the SRS configuration information to detect the SRS that MUE 511 sends.

Return Fig. 9, then, in step S 102, when HeNB 530 confirm MUE 511 move to HeNB 530 sub-districts the edge or neighbouring after, confirm the distribution situation of HUE 531 and HUE 532 in its affiliated subdistrict.

At last, in step S103, HeNB 530 adopts the different cochannel interference cancellation scheme that is suitable for corresponding distribution situation according to determined HUE 531 and HUE 532 different distribution situation in HeNB 530 sub-districts.The scheme of adoptable cochannel interference eliminated can be those cochannel interference cancellation schemes of in the background technology part, describing, is in the cochannel interference cancellation scheme of conceptual phase, also can be the cochannel interference cancellation scheme that will develop future.In following second embodiment, with introducing a kind of cochannel interference cancellation scheme based on power control or power setting this method, novel that is suitable for.

Owing to adopt the different cochannel interference cancellation scheme that is suitable for corresponding distribution situation to HUE different distribution situation in the HeNB sub-district; The cochannel interference elimination method of present embodiment is compared more flexible with prior art cochannel interference elimination method, cochannel interference eliminated better effects if.

Should be noted that; Though in the method for this embodiment; HeNB be know the MUE that is in connection status move to the sub-district the edge or near the time confirm the distribution situation of HUE in the sub-district; And Select and Apply suitable cochannel interference cancellation scheme, but it will be appreciated by those skilled in the art that this only is a kind of preferred version according to the distribution situation of HUE.In fact, HeNB can also MUE move to the sub-district the edge or near after a certain moment confirm the distribution situation of HUE in the sub-district again, and Select and Apply suitable cochannel interference cancellation scheme according to the distribution situation of HUE.In addition; HeNB confirms the distribution situation of HUE in the sub-district; And Select and Apply suitable cochannel interference cancellation scheme according to the distribution situation of HUE and can also (for example combine with other schemes; Be applied to the method for the arbitrary embodiment among following the 3rd to the 5th embodiment), disturb thereby eliminate cochannel flexible and efficiently.

[second embodiment]

Second embodiment of the invention is the method for eICIC in the another kind of Macro-Femto heterogeneous network.In fact, this method is a kind of application of cochannel interference cancellation scheme in first embodiment based on power control or power setting.Figure 15 shows flow chart according to a second embodiment of the present invention.

As scheming visiblely, the step S100 to S 101 among Figure 15 is identical with the corresponding steps among Fig. 9, thereby will begin to describe from step S102 ' here, and no longer repeats this two step is described in detail.

In step S102 ', HeNB judges that whether HUE 531 and the distribution situation of HUE 532 in the sub-district are for all being distributed in center of housing estate.If HUE 531 is the center that HUE 531 and HUE 532 all are in the sub-district, then execution in step S103 ' with the distribution situation of HUE 532 in HeNB 530 sub-districts; If HUE 531 and HUE 532 not all are in the center of sub-district, then execution in step S 104.

HeNB 530 can be based on the up path loss (Path-loss) of HUE 531 and HUE 532 for the definite of geographical position of HUE 531 and HUE 532.For example, HUE 531 can measure descending CRS and obtain the size of downlink path loss, repays the downlink path loss to HeNB through the out-hole run report again.Loss compensates and obtains the up path loss HeNB to downlink path, and like this, HeNB promptly can detect HUE 531 according to the up path loss and be positioned at center of housing estate or cell edge.Again for example; HUE 531 need carry out uplink power control or power setting and report power ascension spatial value (PHR, power headroomreporting) to HeNB, and HeNB calculates the transmitting power of HUE 531 on PUSCH after can obtaining the PHR of HUE 531; Obtain the transmitting power of the SRS of HUE 531 again through backoff algorithm; Then, HUE 531 detects the received power of SRS, and the received power that deducts SRS with the transmitting power of SRS again can obtain the path loss of up link.Like this, HeNB promptly can detect HUE 531 according to the up path loss and is positioned at center of housing estate or cell edge.Again for example; HUE531 feeding back channel state information (CSI; Channel state information) or channel quality indicated value (CQI; Channel quality indicator) or desired value such as SINR give HeNB, HeNB judges that according to the grade of the desired value of CSI or CQI or SINR HUE 531 is central user or edge customer, the grade of CSI or CQI or SINR desired value is high, on behalf of HUE 531, quality well then be central user; Otherwise low, the of poor quality HUE 531 that then represents of the grade of the desired value of CSI or CQI or SINR is edge customer.

Return Figure 15, if confirm that in step S102 ' HUE 531 and HUE 532 are in the center of HeNB sub-district, in step S103 ', HeNB 530 adopts the mechanism of descending power control or power setting to reduce ICI on control channel.

Here, descending power control (power control) and power setting (power setting) are applicable to data channel (PDSCH) and control channel (PBCH, PDCCH, PCFICH and PHICH).And in descending power control or power setting; ENB supports the descending power that possibly carry out to coordinate through definition " Relative Narrowband TX Power (Relative narrowband TX power; RNTP) ", and this RNTP message exchanges between the base station through X2 interface or air interface.The definition of relevant RNTP based on HeNB wireless area (Femtocell-specific) can normative reference document 3GPP TS36.213, is shown below, and the RNTP of LTE Release-8.0 is:

Wherein, RNTP (n _PRB) be the transmitting power that does not comprise the data subcarrier in the OFDM symbol of reference symbol, n _PRBBe the number of PRB, RNTP _ThresholdSatisfy RNTP _Threshold∈ ∞, and-11 ,-10 ,-9 ,-8 ,-7 ,-6 ,-5 ,-4 ,-3 ,-2 ,-1,0 ,+1 ,+2 ,+3} [dB],

Be the base station peak power output, Δ f, Definition list of references 3GPP TS36.211.It should be noted that; Because the peak power output

of HeNB is different with the peak power output

of MeNB; Of the present invention based on HeNB wireless area (Femtocell-specific) though the RNTP of RNTP and LTE Release-8.0 definition have identical form, the implication of is different.

HeNB 530 can pass through X2 interface or air interface and the macrocell base stations MeNB 510 exchanges RNTP message based on HeNB 530 wireless areas, and macrocell base stations MeNB 510 also can be through the RNTP message of X2 interface or air interface and HeNB 530 exchange macrocell base stations MeNB 510.Like this; The RNTP of a plurality of base stations was all understood in other base stations near MeNB 510 reached with HeNB 530; Thereby the ICI that can cause separately through descending power control or the mutual coordination of power setting and resource scheduling algorithm respectively according to RNTP separately; The target of descending power control or power setting is suc as formula shown in (2)

P _{_tx}＝f(SINR _{_MUE511}，SINR _{_HUE531}，SINR _{_HUE532})(2)

In formula (2); As indicated above; When MUE 511 be in HeNB 530 cell edge or near; And all UE of HeNB 530 are when being in the center of housing estate of HeNB 530, and the cochannel that the down control channel that can adopt the method for power control or power setting to reduce 530 couples of MUE 511 of HeNB causes disturbs, and the target of power control or power setting is to make MUE 511 and the SINR of HUE 531 and HUE 532 all be in good horizontal.

The descending power control of formula (2) or power setting target are different from the existing heterogeneous network machine-processed based on the eICIC of power control or power setting.Particularly; The mechanism of eICIC that is used for the control channel of heterogeneous network about power control or power setting; Conclusion in the 62nd meeting of in August, 2010 3GPP LTERAN1; With reference to 3GPP motion R1-105083, R1-105083 thinks: in the Macro-Femto heterogeneous network, a kind of fundamental mechanism of eICIC is the method that adopts time domain and/or power control or power setting.But; About how obtain the effect of eICIC in the LTE-A system through power control or power setting, the idea of each company is not agreed, with reference to 3GPP motion R1-105083; Typical idea may be summarized to be following several types: one of which; Based on the power of the strongest reception signal that comes from Macro, shown in (3), HeNB through type (3) is adjusted the down transmitting power of the maximum that HUE receives; P_M is the power of the strongest reception signal that comes from MeNB that receives of HUE in the formula (3); P_max is the descending maximum transmission power of HeNB, and P_min is the descending minimum emissive power of HeNB, and this pattern (3) is based on P_M in essence and comes the HeNB that HUE is received to control or be provided with at the power of down control channel through adjustment P_max and P_min;

P _{_tx}＝max(min(α·P_M+β，P_max)，P_min)dBm (3)

They are two years old; Based on power control or the power setting of HeNB to the path loss of MUE, shown in (4), HeNB is controlled or is provided with by formula (4) to the transmitting power of the down control channel of HUE; Wherein P_offset representes it is a power bias value, can be with reference to 3GPP motion R1-105083;

P _{_tx}＝MEDIAN(P_M+P_offset，P_max，P_min)dBm (4)

Its three, carry out power control or power setting based on the reception SINR of HUE, shown in (5) and formula (6), the down transmitting power of HeNB can Be Controlled or setting, can be with reference to R1-105083;

$P_{\mathrm{HUE}\_\mathrm{received}}=10{\log }_{10}({10}^{I/10}+{10}^{N_{\mathrm{background}\_\mathrm{noise}}/10})+x,\mathrm{dBm}---\left(5\right)$

P _HeNB＝max(P _min，min(PL _estimation+P _{HUE_received}，P _max))dBm (6)

Its four, based on power control or the power setting of the SINR of MUE, shown in (7), the down transmitting power of HeNB is based on SINR Be Controlled or the setting of the reception signal of MUE;

P _{_tx}＝max(min(α·P_SINR+β，P_max)，P_min)dBm (7)

Its five, based on control of the power of PBCH or power setting, consider that promptly HUE is in the good covering of HeNB; For example the HUE PBCH information that need not receive continuous 4 10ms radio frames obtains the full detail of PBCH; Therefore, in view of PBCH has full detail 4 continuous 10ms radio frames, can consider to turn off the PBCH emission of 1-3 radio frames; So just can reduce the transmitting power of PBCH, thereby reduce the ICI that the PBCH to MUE causes.

Compare above-mentioned 5 kinds of power control or power setting targets that propose through power control or the present invention shown in power setting method and the formula (2) of HeNB that motion R1-105083 mentions; Can find out; Power control that present embodiment proposes or power setting method are that to be in good level be that target is carried out power control or power setting to the SINR with MUE 511 and HUE531 and HUE 532; When the HUE in the HeNB sub-district all is distributed in center of housing estate; HeNB just can reduce the down transmitting power of control channel like this, thus the ICI of the control channel that has reduced MUE is received.But, if all HUE inequalities are in the HeNB center of housing estate in the HeNB sub-district, promptly have at least a HUE to be in cell edge, control of the descending power of HeNB or power setting meeting become complicated so.For example; The HUE ten minutes that is in the HeNB cell edge is near the MUE that is in the HeNB cell edge equally; The HeNB center of housing estate also has other HUE simultaneously; Like this, the power of HeNB when sending downlink signaling (PBCH, PDCCH etc.) must satisfy the requirement of the SINR of all HUE on HeNB center of housing estate and the edge simultaneously.In this case; HeNB can't only control down transmitting power according to being in HeNB cell edge and the ten minutes SINR near the HUE of MUE; Therefore, can't reach control of good power or power setting effect, also can't reach the purpose of the ICI that reduces the control channel that MUE receives.Therefore; The distribution situation that power control that present embodiment proposes or power setting method are specially adapted to the HUE in the HeNB sub-district is that HUE reduces the ICI that MUE receives when being distributed in center of housing estate, but when HUE not all is distributed in center of housing estate, can't reach the good purpose that reduces the ICI of the control channel that MUE receives.

Return Figure 15, if confirm that in step S102 ' HUE 531 and HUE 532 not all are in the center of sub-district, in step S104, HeNB 530 adopts the mode of TDM to reduce the ICI of control channel.

Here, HeNB 530 adopts the mode of TDM to reduce the ICI of control channel, but that the eICIC scheme based on TDM considered has is a variety of, and present embodiment has only been described a kind of typically based on the eICIC scheme of gap frame and MBSFN subframe almost.Figure 16 shows based on the sketch map of the eICIC scheme of gap frame and MBSFN subframe almost; Has the flexibility that to dispose the CRS symbol though consider the MBSFN subframe; But the MBSFN subframe only can be configured on #1, #2, #3, #6, #7, #8 subframe; Therefore, HeNB 530 adopts the almost associated methods of gap frame and MBSFN subframe.Shown in figure 16, HeNB 530 can adopt almost gap frame+MBSFN subframe in #1 subframe and #6 subframe, does not comprise the CRS symbol at the data field of #1 subframe and #6 subframe, and HeNB 530 does not produce ICI to the CRS of MeNB at data field like this.In addition, because MeNB 510 has deviation with HeNB 530 on #0, #5 subframe, therefore, MeNB 510 can not receive when control channels such as PSS/SSS/PBCH/PDCCH/PDSCH send signaling owing to HeNB 530 sends the ICI that signaling causes at control channel.

It is to be noted: though the present invention has defined the eICIC scheme that combines TDM based on power control (or power setting); But one of ordinary skill in the art will recognize, other eICIC schemes of the prior art (like methods such as time domain eICIC, frequency domain eICIC) of also can again mentioning based on the eICIC scheme of power control (or power setting) combine.

[the 3rd embodiment]

The third embodiment of the present invention is the method for eICIC in a kind of Macro-Femto heterogeneous network.Figure 17 shows the sketch map according to the application scenarios of the eICIC method of third embodiment of the invention.Shown in figure 17; Whole heterogeneous network comprises macrocell base stations MeNB 610, femtocell HeNB 630, macrocellular subscriber equipment MUE 611, MUE 612, home network user equipment HUE 631; Wherein, MeNB 610 is serving BSs of MUE 611 and MUE 612, and HeNB 630 is serving BSs of HUE 631, and MeNB 610 and HeNB 630 pass through backstage (Backhaul) interface communication.

Figure 18 shows the flow chart according to the method for eICIC in the heterogeneous network of third embodiment of the invention.Shown in figure 17, this method originates in step S200.In this step, when MUE611 was in idle pulley and gets into the CSG sub-district of HeNB, the RSRP of a plurality of neighbor cells of MUE 611 monitorings carried out district reselecting.

List of references 3GPP TS 36.300, LTE mobile management show as district reselecting (Cell reselction) under UE is in idle condition.Here, Figure 19 shows the sketch map that UE is in the LTE mobile management under the idle condition.Shown in figure 19, the detailed process of district reselecting is following: measurement result is measured and write down to the information such as RSRP that base stations neighboring (for example, HeNB, PeNB, other MeNB etc.) was sent around MUE reached serving BS MeNB; MUE confirms the criterion of district reselecting, for example, and based on the criterion of the grade of wireless area, based on criterion of absolute priority or the like; MUE reselects out the Target Wireless sub-district that oneself should belong to according to determined district reselecting criterion; The Target cell that the MUE counterweight is selected inserts checking; If the access of Target cell checking is unrestricted, then show the cell reselection process success of MUE.

Then, method advances to step S201, and in this step, MUE 611 is resident in the HeNB630 sub-district, and HeNB 630 judges that MUE 611 is idle pulley or connection mode.If MUE 611 is idle pulleys, method advances to step S202.If MUE 611 is connection modes, method advances to step 203.

In step S202, MUE 611 detects BCH and the paging information that HeNB 630 sends.Here, Figure 20 shows the schematic diagram of paging, and MUE 611 is HUE at this moment.Shown in figure 19; This moment, MUE 611 only just can obtain the paging information that HeNB sends through the P-RNTI information that detection HeNB sends on PDCCH, and MUE 611 can adopt the receive mode of DRX to save battery electric quantity in the other times that do not detect paging information.

Return Figure 18, in step S203, MUE 611 sends the PRACH signal to HeNB 630.Then in step S204, HeNB 630 judges that MUE 611 possess the access right of HeNB 630 and can in the HeNB sub-district, carry out the CSG UE of whole HUE functions, still do not possess the Non-CSG UE of access rights.If MUE 611 is CSG UE, with regard to execution in step S205, dispose MUE 611 through the RRC signaling by HeNB 630, connect with the communication of setting up with MUE611.If MUE 611 is Non-CSG UE, with regard to execution in step S206, MUE 611 is shown in figure 15 to switch to MeNB 610 from HeNB 630.

Then, in step S207, HeNB 630 adopts various cochannel interference cancellation schemes to reduce the ICI of control channel.

For example, HeNB 630 can adopt the mode of TDM to reduce the ICI of control channel, but that the eICIC scheme based on TDM considered has is a variety of, and present embodiment has only been described a kind of typically based on the eICIC scheme of TDM.Figure 21 shows the sketch map based on the eICIC scheme of time migration (time shift).Shown in figure 21, HeNB 630 can send the PDCCH/CRS signaling on the 0th and the 1st carrier wave symbol, and MeNB 610 can send the PDCCH/CRS signaling on the 0th, the 1st, the 2nd carrier wave symbol.Like this; The descending PDCCH/CRS of HeNB 630 and MeNB610 staggers at frequency domain and time domain; Thereby control channel PDCCH and the cochannel on the CRS having avoided acting on the MUE 611 disturb; In like manner, the ICI on the PBCH/SCH control channel also can adopt the ICIC method of similar time migration to avoid.

Yet, based on the eICIC scheme of time migration to the synchronous requirement of MeNB 610 and HeNB 630 than higher.Shown in figure 21, there are 5 symbol offset in the PDCCH/CRS of the PDCCH/CRS of MeNB 610 and HeNB 630.If MeNB 610 often changes with the simultaneous bias of HeNB 630,, the PDCCH/CRS of PDCCH/CRS and the HeNB 630 of MeNB 610 causes ICI on time and frequency thereby being overlapped each other.

[the 4th embodiment]

The fourth embodiment of the present invention is the method for eICIC in a kind of Macro-Femto heterogeneous network.Figure 22 shows the sketch map according to the application scenarios of the eICIC method of fourth embodiment of the invention.Shown in figure 22; Whole heterogeneous network comprises macrocell base stations MeNB 710, femtocell HeNB 730, macrocellular subscriber equipment MUE 711, MUE 712, home consumer device HUE731; Wherein, MeNB 710 is serving BSs of MUE 711 and MUE 712, and HeNB 730 is serving BSs of HUE 731, and MeNB 710 and HeNB 730 pass through backstage (Backhaul) interface communication.

Figure 23 shows the flow chart according to the method for eICIC in the heterogeneous network of fourth embodiment of the invention.Shown in figure 23, this method originates in step S300.In this step, when MUE711 is in connection mode and moves to the edge of HeNB 730 sub-districts or when neighbouring, MUE 711 sends to MeNB 710 with measurement report.

Then, in step S301, MeNB 710 judges that MUE 711 are CSG UE or Non-CSG is UE.If MUE 711 is CSG UE, with regard to execution in step S302.In this step; MeNB 710 adopts the background communication modes to transmit for example RRC context to HeNB 730, and said RRC goes up style of writing and comprises UE capacity, antenna configurations, switches required information (being called " handover preparation request " information here) based on the RRM information of UE etc.Then, in step S304, HeNB 730 carries out the sub-district switching after receiving " handover preparation request ", and MUE 711 becomes HUE.

If judge that in step S301 MUE 711 is Non-CSG UE, with regard to execution in step S303, MeNB 710 uses the background communication mode to can be described as " switch and prepare " information (for example, SRS, subframe ID etc.) of false handover information to HeNB 730 transmission.Then, in step S305, HeNB 730 adopts various cochannel interference cancellation schemes to reduce cochannel and disturbs after receiving " switch and prepare " information.

For example, HeNB 730 can adopt the mode of TDM to reduce the ICI of control channel, but that the eICIC scheme based on TDM considered has is a variety of, and present embodiment has only been described a kind of typically control with power based on TDM or the eICIC scheme of power setting.Figure 24 shows the sketch map based on the eICIC scheme of TDM and power control or power setting.Shown in figure 24, MeNB710 sends downlink signaling in control signaling territory, sends downlink data at data field; For avoiding HeNB730 that MUE 711 is produced the ICI in control signaling territory, suppose that subframe 0 and subframe 2 are gap frames, then HeNB 730 does not send control signaling in subframe 0 and subframe 2; So; MeNB 710 can send control signaling on the control domain of subframe 0 and subframe 2, like this, and the ICI that has avoided MeNB 710 on the control domain of subframe 0 and subframe 2, to receive.In addition; As indicated above; Consider Release-8.0/9.0 UE backwards compatibility and on the gap frame of LTE-A system, adopt the CRS configuration, and consider that PBCH/SCH is distributed in data field, therefore; On the gap frame, adopt the mode of power control or power setting, promptly HeNB 730 adopts the mode of descending power control or power setting to avoid MUE 711 at PBCH/SCH, the last ICI that receives of CRS on subframe 0 and subframe 2 these 2 gap frames.Therefore, the eICIC scheme of present embodiment is a kind of method that combines based on the control of TDM and power or power setting.

[the 5th embodiment]

The fifth embodiment of the present invention is the method for eICIC in a kind of Macro-Femto heterogeneous network.Figure 25 shows the sketch map according to the eICIC method of fifth embodiment of the invention.Shown in figure 25; Whole heterogeneous network comprises macrocell base stations MeNB 810, femtocell HeNB830, macrocellular subscriber equipment MUE 811 and home network user equipment HUE 831; Wherein, MeNB 810 is serving BSs of MUE 811, and HeNB 830 is serving BSs of HUE 831, and MeNB 810 and HeNB 830 pass through backstage (Backhaul) interface communication.

Figure 26 shows the flow chart according to the method for eICIC in the heterogeneous network of fifth embodiment of the invention.Shown in figure 26, the step S401 to S404 of this method is identical with the step S301 to S304 of method according to fourth embodiment of the invention shown in Figure 23, thereby will these steps be repeated in this description here.The difference of Figure 26 and method shown in Figure 23 is, in step S405, after HeNB 830 receives false handover information, HUE 831 is carried out the DRX configuration, and adopts the TDM interference cancellation scheme to reduce cochannel and disturb.

Discontinuous reception (DRX; Discontinuous Reception) is a kind of new power saving working mechanism that in LTE, introduces; Make UE when having transfer of data, need not get into idle pulley, still keep the synchronous regime with the base station, UE stops to monitor the PDCCH channel during this period.DRX divides two kinds: a kind of IDLE of being DRX, as its name suggests, the noncontinuity that just is under the idle condition as UE receives.Because when being in idle condition, do not had RRC connection and user's specific resource, therefore this DRX mainly is monitored call channel and broadcast channel, as long as define the fixing cycle, just can reach the purpose of discontinuous reception.But UE wants the monitoring users data channel, then must be introduced into connection status from idle condition.Another kind of DRX is ActiveDRX, and just UE is in the DRX under the RRC-CONNECTED state, can the optimization system resource distribution, and the more important thing is and can practice thrift mobile phone power, and need not reach this purpose through letting mobile phone enter into the RRC_IDLE pattern.For example, use (like web page browsing, instant messaging etc.) for some non real-times and always exist mobile phone not need ceaselessly to monitor a period of time of downlink data and relevant treatment, this moment, DRX just can be applied to such situation.In addition owing to still exist RRC to connect under this state, thus UE will to forward the speed of status of support to very fast.

Figure 27 shows the sketch map of DRX configuration.In the present embodiment, the HUE 831 that is in connection mode by 830 couples of HeNB carries out the DRX configuration.At this moment, still exist RRC to be connected between HeNB 830 and the MUE 811, therefore, MUE 811 can be transformed into the connection mode state of non-DRX configuration at any time apace.Shown in figure 27; HeNB 830 is in the DRX time durations at HUE 831 and sends descending control signaling for HUE 831; And MeNB 810 sends descending control signaling during HUE 831 is in non-DRX, for MUE 811, and like this, the descending control signaling of MeNB 810 and HeNB830 is the mode of TDM in time; Therefore, the descending control signaling of HeNB 830 can not produce ICI to MUE 811.

Should be noted that; Though in above the 3rd to the 5th embodiment, having described the MUE primitive attribute still is that the judgement of Non-CSG UE is carried out by MeNB or HeNB for CSG UE; One of ordinary skill in the art will recognize; Judgement to the MUE primitive attribute also possibly accomplished by the core net under MeNB or the HeNB, and the core net under MeNB or the HeNB can be transferred to MeNB or HeNB with judged result through the backstage interface.

[the 6th embodiment]

The sixth embodiment of the present invention is a kind of macrocell base stations MeNB that is used for realizing at heterogeneous network enhancement mode cochannel interference eliminated.Figure 28 shows the sketch map of the hardware capability realization of this MeNB.Shown in figure 28, MeNB comprises: RF processing unit 20, signaling and Data Receiving unit 21, signaling and data processing unit 22, MUE measurement report processing unit 23, data storage cell 24, switching judging unit, sub-district 25, MUE determined property unit 26, background communication interface unit 27 and signaling and data transmission unit 28.

Wherein, Processing such as down-conversion, if sampling are carried out in RF processing unit 20 receptions from the radiofrequency signal of the up link of MUE and to radiofrequency signal; And the baseband signal after will handling is transferred to signaling and data processing unit 21; In addition, RF processing unit 20 also is used to receive the baseband signal from signaling and data transmission unit 28, and baseband signal is carried out intermediate frequency and upconversion process to launch to MUE.RF processing unit 20 can be used for sending information to HeNB, move to notice MUE HeNB the sub-district the edge or near.

Signaling and Data Receiving unit 21 received RF processing units 20 are handled the baseband signal that obtains; Give MUE measurement report element 23 the MUE measurement report message transmission in the baseband signal, and other upstream datas and/or the signaling of the MUE in the baseband signal is transferred to signaling and data processing unit 22.

22 pairs of signalings of signaling and data processing unit and data are carried out processing such as demodulation, decoding, detection, and give data storage cell 24 signaling after handling and transfer of data.

MUE measurement report processing unit 23 receives the measurement report information of the MUE that comes from signaling and Data Receiving unit 21; And MUE measurement report information handled; Be that MeNB understands the service quality (QoS of this MUE in the sub-district according to the measurement report of MUE; Quality of severice) situation, and give switching judging unit, sub-district 25 measurement report of MUE and QoS message transmission.

Data storage cell 24 receives and stores signaling and data after signaling and data processing unit 22 are handled as the stay of two nights of communication system up link.

Switching judging unit, sub-district 25 receives measurement report and the QoS information of the MUE that comes from MUE measurement report processing unit 23, and judges according to measurement report and the QoS information of MUE whether MUE carries out the sub-district and switch.If need carrying out the sub-district, MUE switches; Switching judging unit, sub-district 25 the signaling that is used for switching the sub-district (for example; Handover preparation request information, comprise MUE capacity, antenna configurations, based on RRM information of UE etc.) be transferred to background communication interface unit 27 and signaling and data transmission unit 28.

MUE determined property unit 26 judges that the primitive attribute of MUE is CSG UE or Non-CSG is UE.Receive the measurement report and QoS information of MUE of MUE measurement report processing unit 23 transmission when MUE determined property unit 26 after, MUE determined property unit 26 is transferred to background communication interface unit 27 to the primitive attribute of MUE (CSG UE or Non-CSG UE).

Background communication interface unit 27 receive come from switching judging unit, sub-district 25 the signaling that is used for switching the sub-district (for example; Handover preparation request information, comprise MUE capacity, antenna configurations, based on RRM information of UE etc.) and the primitive attribute of the MUE of MUE determined property unit 26.Background communication interface unit 27 to MUE be CSG UE and MUE need situation that the sub-district switches to HeNB send the sub-district hand off signaling (for example, handover preparation request information, comprise MUE capacity, antenna configurations, based on the RRM information of UE etc.); To MUE is that Non-CSG UE and MUE need the false situation about switching in sub-district to send " preparation is switched in the sub-district " signaling (for example, information such as the SRS of MUE, subframe ID) to HeNB.Background communication interface unit 27 also can be used for sending information to HeNB, move to notice MUE HeNB the sub-district the edge or near.

Signaling and data transmission unit 28 receive the signaling that switch the sub-district that is used for that the needs that come from data storage cell 24 send to signaling and the data of MUE and come from switching judging unit, sub-district 25, and launch to these message transmission RF processing unit 20.

Because RF processing unit 20 all is the interface that MeNB and external equipment communicate with background communication interface unit 27, thereby also can merge into communications interface unit.

[the 7th embodiment]

The seventh embodiment of the present invention is a kind of macro cells subscriber equipment MUE that is used for realizing at heterogeneous network enhancement mode cochannel interference eliminated.Figure 29 shows the sketch map of the hardware capability realization of this MUE.Shown in figure 29, MUE comprises: RF processing unit 30, signaling and Data Receiving unit 31, signaling and data processing unit 32, MUE metrical information detecting unit 33, data storage cell 34, MUE metrical information transmitting element 35, district reselecting unit 36 and signaling and data transmission unit 37.

Wherein, Processing such as down-conversion, if sampling are carried out in RF processing unit 30 receptions from the radiofrequency signal of the down link of MeNB and to radiofrequency signal; And the baseband signal after will handling is transferred to signaling and data processing unit 31; In addition, RF processing unit 30 also is used to receive the baseband signal from signaling and data transmission unit 37, and baseband signal is carried out intermediate frequency and upconversion process to launch to MeNB.

Baseband signal after signaling and Data Receiving unit 31 received RF processing units 30 are handled; Give MUE metrical information detecting unit 33 message transmission that relevant MUE in the baseband signal measures, and other downlink datas and/or the signaling of MeNB in the baseband signal is transferred to signaling and data processing unit 32.

32 pairs of signalings of signaling and data processing unit and data are carried out processing such as demodulation, decoding, detection, and give data storage cell 34 signaling after handling and transfer of data.

MUE metrical information detecting unit 33 receives the information of the relevant MUE measurement that comes from signaling and Data Receiving unit 31; And the MUE metrical information detected; Generate the MUE measurement report according to testing result, be transferred to MUE metrical information transmitting element 35 and district reselecting unit 36 to the MUE measurement report again.

Data storage cell 34 receives and stores signaling and data after signaling and data processing unit 32 are handled as the stay of two nights of communicating system descending link.

MUE metrical information transmitting element 35 receives the MUE measurement report that comes from MUE metrical information detecting unit 33, sends to MeNB to the MUE measurement report.

District reselecting unit 36 receives the MUE measurement report that comes from MUE metrical information detecting unit 33, if when MUE is in idle pulley, MUE makes the decision of district reselecting according to the MUE measurement report.

Signaling and data transmission unit 37 receives signaling that the needs that come from data storage cell 34 send to MeNB, comes from the MUE measurement report of MUE metrical information transmitting element 35 and the decision that comes from the district reselecting of district reselecting unit 36, and launches to these message transmission RF processing unit 30.

[the 8th embodiment]

The eighth embodiment of the present invention is a kind of femtocell HeNB that is used for realizing at heterogeneous network enhancement mode cochannel interference eliminated.Figure 30 shows the sketch map of the hardware capability realization of this HeNB.Shown in figure 30, this HeNB comprises: RF processing unit 40, signaling and Data Receiving unit 41, signaling and data processing unit 42, HUE measurement report processing unit 43, data storage cell 44, switching judging unit, sub-district 45, HUE distribution situation are confirmed unit 46, background communication interface unit 47, signaling and data transmission unit 48, cochannel interference cancellation scheme selected cell 491, cochannel interference cancellation scheme performance element 491 and MUE determined property unit 410.

Wherein, Processing such as down-conversion, if sampling are carried out in RF processing unit 40 receptions from the radiofrequency signal of the up link of HUE and to radiofrequency signal; And the baseband signal after will handling is transferred to signaling and data processing unit 41; In addition, RF processing unit 40 also is used to receive the baseband signal from signaling and data transmission unit 48, and baseband signal is carried out intermediate frequency and upconversion process to launch to HUE.

Baseband signal after signaling and Data Receiving unit 41 received RF processing units 40 are handled; Give HUE measurement report processing unit 43 the HUE measurement report message transmission in the baseband signal, and other upstream data and/or the signaling of the HUE in the baseband signal is transferred to signaling and data processing unit 42.

42 pairs of signalings of signaling and data processing unit and data are carried out processing such as demodulation, decoding, detection, and give data storage cell 44 signaling after handling and transfer of data.

HUE measurement report processing unit 43 receives the measurement report information of the HUE that comes from signaling and Data Receiving unit 41, and HUE measurement report information is handled.Be that HeNB understands service quality (QoS, the quality of severice) situation of this HUE in the sub-district according to the measurement report of HUE, and give sub-district switch unit 45 measurement report of HUE and QoS message transmission.

Data storage cell 44 receives and stores signaling and data after signaling and data processing unit 42 are handled as the stay of two nights of communication system up link.

Sub-district switch unit 45 receives measurement report and the QoS information of the HUE that comes from HUE measurement report processing unit 43, and judges according to measurement report and the QoS information of HUE whether HUE carries out the sub-district and switch.Switch if HUE need carry out the sub-district, the signaling that sub-district switch unit 45 switches the sub-district (for example, handover preparation request information, comprise HUE capacity, antenna configurations, based on the RRM information of UE etc.) be transferred to background communication interface unit 47.

The HUE distribution situation is confirmed the distribution situation of unit 46 definite HUE, and informs power control or power setting unit 49 to this situation.

Background communication interface unit 47 receive the signaling that is used for switching the sub-district that comes from sub-district switch unit 45 (for example, handover preparation request information, comprise MUE capacity, antenna configurations, based on the RRM information of UE etc.), and send the sub-district hand off signaling to MeNB.

Signaling and data transmission unit 48 receive signaling and the data and the signaling that switch the sub-district that is used for that comes from sub-district switch unit 45 that the needs that come from data storage cell 44 send to HUE, and control these message transmission or power setting to carry out power to power control or power setting unit 49.

Cochannel interference cancellation scheme selected cell 491 receives the signaling that comes from signaling and data transmission unit 48 and/or data and confirms the distribution situation of unit 46 from the HUE distribution situation, is suitable for the cochannel interference cancellation scheme of the distribution situation of determined HUE according to the distribution situation selection of determined HUE.

Cochannel interference cancellation scheme performance element 492 is carried out selected cochannel interference cancellation scheme.

MUE determined property unit 410 judges that the primitive attribute of MUE is CSG UE or Non-CSG is UE.

Relation according to above-mentioned first embodiment and second embodiment; It will be appreciated by those skilled in the art that; Can comprise power control or power setting unit in the cochannel interference cancellation scheme performance element 492, be used to carry out power control or the power setting that second embodiment of the invention is described.

[the 9th embodiment]

The nineth embodiment of the present invention is a kind of femtocell community user equipment HUE that is used for carrying out at heterogeneous network enhancement mode cochannel interference eliminated.Figure 31 shows the sketch map of the hardware capability realization of this HUE.Shown in figure 31, HUE comprises: RF processing unit 50, signaling and Data Receiving unit 51, signaling and data processing unit 52, MUE metrical information detecting unit 53, data storage cell 54, HUE metrical information transmitting element 55, district reselecting unit 56 and signaling and data transmission unit 57.

Wherein, Processing such as down-conversion, if sampling are carried out in RF processing unit 50 receptions from the radiofrequency signal of the down link of HeNB and to radiofrequency signal; And the baseband signal after will handling is transferred to signaling and data processing unit 51; In addition, RF processing unit 50 also is used to receive the baseband signal from signaling and data transmission unit 57, and baseband signal is carried out intermediate frequency and upconversion process to launch to HeNB.

Baseband signal after signaling and Data Receiving unit 51 received RF processing units 50 are handled; Give MUE metrical information detecting unit 53 message transmission that the relevant HUE in the baseband signal measures, and other downlink datas and/or the signaling of the HeNB in the baseband signal is transferred to signaling and data processing unit 52.

52 pairs of signalings of signaling and data processing unit and data are carried out processing such as demodulation, decoding, detection, and give data storage cell 54 signaling after handling and transfer of data.

HUE metrical information detecting unit 53 receives the information of the relevant HUE measurement that comes from signaling and Data Receiving unit 31; And the HUE metrical information detected; And, be transferred to HUE metrical information transmitting element 55 and district reselecting unit 56 to the HUE measurement report again according to testing result generation HUE measurement report.

Data storage cell 54 is as the stay of two nights of communicating system descending link, and reception and storage come from signaling and the data after signaling and data processing unit 52 processing.

HUE metrical information transmitting element 55 receives the HUE measurement report that comes from HUE metrical information detecting unit 53, sends to HeNB to the HUE measurement report.

District reselecting unit 56 receives the HUE measurement report that comes from HUE metrical information detecting unit 53, if when HUE is in idle pulley, HUE makes the decision of district reselecting according to the HUE measurement report.

Signaling and data transmission unit 57 receive signaling that the needs that come from data storage cell 54 send to HeNB, come from the HUE measurement report of HUE metrical information transmitting element 55 and come from the decision of the district reselecting of district reselecting unit 56, and launch to these message transmission RF processing unit 50.

As stated, the embodiment of the invention has provided method and the relevant base station and the subscriber equipment of enhancement mode cochannel interference eliminated in the heterogeneous network, has simplicity of design, comprehensive, efficient, flexible characteristic.Method that the present invention proposes and relevant base station and subscriber equipment can comprise third generation cellular mobile network (3G), surpass three generations's cellular mobile network (S3G, B3G), the 4th generation cellular mobile network (4G), single-frequency radio network (SFN), wireless lan (wlan), wireless wide area network (WWAN), multimedia broadcast-multicast service net (MBMS), self-organization network (Mesh for various wireless or mobile networks; Ad Hoc, Censor Network), the network cooperation problem of digital home network systems such as (e-Home) provides important theory foundation and concrete implementation method.

In above description, to each step, enumerated a plurality of instances, though the inventor indicates instance associated with each other as much as possible, this does not also mean that must there be corresponding relation in these instances according to corresponding label.As long as selected instance do not have contradiction between given condition, can in different steps, select the not corresponding instance of label to constitute the corresponding techniques scheme, such technical scheme also should be regarded as within the scope of the invention involved.

Should be noted in the discussion above that in above description,, show technical scheme of the present invention, but be not intended that the invention be limited to above-mentioned steps and cellular construction only with the mode of example.Under possible situation, can adjust and accept or reject step and cellular construction as required.Therefore, some step and unit are not the necessary element of overall invention thought of embodiment of the present invention.Therefore, technical characterictic essential to the invention only is subject to the minimum requirements that can realize overall invention thought of the present invention, and does not receive the restriction of above instantiation.

So far invention has been described in conjunction with the preferred embodiments.Should be appreciated that those skilled in the art can carry out various other change, replacement and interpolations under the situation that does not break away from the spirit and scope of the present invention.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited accompanying claims.

Claims (30)

1. the method for enhancement mode cochannel interference eliminated in the heterogeneous network comprises:

Femtocell HeNB confirms the distribution situation of home consumer device HUE in the HeNB sub-district;

HeNB is according to the distribution situation of determined HUE, and selection is suitable for the cochannel interference cancellation scheme of the distribution situation of determined HUE; And

HeNB carries out selected cochannel interference cancellation scheme.

2. method according to claim 1 before said HeNB confirms the step of the distribution situation of HUE in the HeNB sub-district, also comprises:

Macrocell base stations MeNB detect the macrocellular subscriber equipment MUE be in connection status move to the HeNB sub-district the edge or near; And

MeNB sends information to HeNB, make HeNB can based on said information know said MUE move to the HeNB sub-district the edge or near.

3. method according to claim 2, wherein, said information is to send with the form of backstage signaling or air interface signaling.

4. method according to claim 3, wherein, said backstage signaling or air interface signaling are that the said MUE of expression moves to the edge of HeNB sub-district or near incident.

5. method according to claim 3, wherein, said backstage signaling or air interface signaling are the SRS configuration informations.

6. method according to claim 1, wherein

If it is the center that all HUE in the HeNB sub-district are distributed in the HeNB sub-district that HeNB confirms the distribution situation of HUE in the HeNB sub-district, HeNB carries out the cochannel interference cancellation scheme based on descending power control or power setting;

Otherwise HeNB carries out the cochannel interference cancellation scheme based on TDM.

7. method according to claim 6, wherein, definition is based on the RNTP of HeNB, to support the cochannel interference cancellation scheme based on descending power control or power setting.

8. method according to claim 7, wherein, said RNTP based on HeNB is notified to adjacent base station with the form of backstage signaling or air interface signaling.

9. according to each described method in the claim 6 to 8, wherein, the target of said descending power control or power setting is: make the SINR of all HUE in said MUE and the HeNB sub-district all be in good level.

10. according to each described method in the claim 1 to 8, wherein, the distribution situation of HUE is based on that the up path loss of HUE confirms in the HeNB sub-district.

11. according to each described method in the claim 1 to 8, wherein, the distribution situation of HUE is based on that the indicated value of the reflection channel quality of HUE feedback confirms in the HeNB sub-district.

12. the method for enhancement mode cochannel interference eliminated in the heterogeneous network comprises:

When the MUE in residing in the HeNB sub-district got into connection mode, the core net under HeNB or the HeNB judged whether MUE is CSG UE;

If said MUE is CSG UE, HeNB and MUE establish a communications link; And

If said MUE is not CSG UE, HeNB carries out the cochannel interference eliminated.

13. method according to claim 12, wherein, said MUE resides in the HeNB sub-district through carrying out district reselecting under idle pulley.

14. method according to claim 13, wherein, if the MUE in residing in the HeNB sub-district gets into idle pulley, MUE detects broadcasting and the paging information that HeNB sends.

15. the method for enhancement mode cochannel interference eliminated in the heterogeneous network comprises:

MeNB detect the MUE be in connection status move to the HeNB sub-district the edge or near;

Core net under MeNB or the MeNB judges whether MUE is CSG UE;

If MUE is CSG UE, MeNB sends MUE to HeNB and switches to the required information of HeNB; And

If MUE is not CSG UE, MeNB sends false handover information to HeNB, and HeNB carries out the cochannel interference eliminated according to said false handover information.

16. method according to claim 15, wherein, if MUE is not CSG UE, HeNB carries out based on the cochannel interference cancellation scheme of TDM and power control or power setting and carries out the cochannel interference eliminated.

17. method according to claim 15, wherein, if MUE is not CSG UE, HeNB carries out DRX configuration and sends the descending control signaling of HUE at the DRX cycle of HUE HUE, and MeNB sends the descending control signaling of MUE at the non-DRX cycle of HUE.

18. according to the described method of claim 15 to 17, wherein, carrying out required information of sub-district switching and said false handover information is to send with the form of backstage signaling.

19. according to the described method of claim 15 to 17, wherein, carrying out the sub-district, to switch required information be the RRC context, said RRC context comprises UE capacity, antenna configurations, based on the RRM information of UE.

20. according to the described method of claim 15 to 17, wherein, SRS that said false handover information is MUE and/or subframe ID.

21. a HeNB who is used for carrying out at heterogeneous network enhancement mode cochannel interference eliminated comprises:

The HUE distribution situation is confirmed the unit, is used for confirming the distribution situation of HeNB sub-district HUE;

Cochannel interference cancellation scheme selected cell is used for selecting to be suitable for according to the distribution situation of determined HUE the cochannel interference cancellation scheme of the distribution situation of determined HUE; And

Cochannel interference cancellation scheme performance element is used to carry out selected cochannel interference cancellation scheme.

22. HeNB according to claim 21, wherein, said cochannel interference cancellation scheme performance element comprises power control or power setting unit, and said cochannel interference cancellation scheme performance element is suitable for:

When the HUE distribution situation confirms that the unit confirms that the distribution situation of the HUE in the HeNB sub-district all is distributed in center of housing estate for all HUE, utilize power control or power setting unit to carry out descending power control or power setting, disturb to eliminate cochannel; And

When the HUE distribution situation confirms that the unit confirms that the distribution situation of the HUE in the HeNB sub-district not all is distributed in center of housing estate for all HUE, carry out cochannel interference cancellation scheme based on TDM.

23. a HeNB who is used for carrying out at heterogeneous network enhancement mode cochannel interference eliminated comprises:

MUE determined property unit is used for when the MUE that resides at the HeNB sub-district gets into connection mode, judging whether this MUE is CSG UE;

Signaling and data transmission unit, being used at MUE is under the situation of CSG UE, sends to be used between HeNB and MUE, establish a communications link required signaling and data; And

Cochannel interference cancellation scheme performance element, being used at MUE is not under the situation of CSG UE, carries out the cochannel interference eliminated.

24. a HeNB who is used for carrying out at heterogeneous network enhancement mode cochannel interference eliminated comprises:

The background communication interface unit is used for switching required information or false handover information from MeNB reception carrying out sub-district;

Signaling and data transmission unit are used for receiving from MeNB at the background communication interface unit and carry out the sub-district when switching required information, send to be used to make MUE to switch to signaling and the data of HeNB from MeNB; And

Cochannel interference cancellation scheme performance element is used at the background communication interface unit carrying out the cochannel interference eliminated when MeNB receives false handover information.

25. HeNB according to claim 24 wherein, receives under the situation of false handover information from MeNB at the background communication interface unit

Said signaling and data transmission unit also are suitable for sending signaling and the data that are used for HUE is carried out the DRX configuration; And

Said cochannel interference cancellation scheme performance element is suitable for controlling said signaling and data transmission unit and sends the descending control signaling of HUE at the DRX cycle of HUE, and is sent the descending control signaling of MUE by MeNB at the non-DRX cycle of HUE.

26. one kind is used for being supported in the MeNB that heterogeneous network carries out enhancement mode cochannel interference eliminated, comprises:

MUE measurement report processing unit is used for the measurement report according to MUE, detect the MUE be in connection status move to the HeNB sub-district the edge or near; And

Communications interface unit is used for sending information to HeNB, make HeNB can based on said information know said MUE move to the HeNB sub-district the edge or near, and the distribution situation of HUE in definite HeNB sub-district.

27. MeNB according to claim 26, wherein, said communications interface unit is background communication interface unit and/or RF processing unit.

28. one kind is used for being supported in the MeNB that heterogeneous network carries out enhancement mode cochannel interference eliminated, comprises:

MUE measurement report processing unit is used for the measurement report according to MUE, detect the MUE be in connection status move to the HeNB sub-district the edge or near;

MUE determined property unit is used to judge whether said MUE is CSG UE; And

Communications interface unit, being used at MUE is under the situation of CSG UE, sends MUE to HeNB and switches to the required information of HeNB, and be not under the situation of CSG UE at MUE, sends false handover information to HeNB.

29. one kind is used for being supported in the MUE that heterogeneous network carries out enhancement mode cochannel interference eliminated, comprises:

The district reselecting unit, be used for the MUE that is in idle pulley move to the HeNB sub-district the edge or near the time carry out district reselecting, make MUE reside in the HeNB sub-district; And

Signaling and Data Receiving unit; Be used for when the MUE that resides in HeNB gets into idle pulley, receiving broadcasting and the paging information that HeNB sends, and reside in receive when MUE among the HeNB gets into connection mode send under the situation that HeNB is CSG UE at MUE, required signaling and data establish a communications link between HeNB and MUE.

30. one kind is used for being supported in the MUE that heterogeneous network carries out enhancement mode cochannel interference eliminated, comprises:

Signaling and Data Receiving unit, be used to receive that HeNB sends, be used to make MUE to switch to signaling and the data of HeNB from MeNB, and after MUE switches to HeNB from MeNB, receive signaling and data from HeNB; And

Signaling and data transmission unit are used for after MUE switches to HeNB from MeNB, sending signaling and data to HeNB.

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