CN104853359B

CN104853359B - Heterogeneous network disturbance coordination method and interference coordination device

Info

Publication number: CN104853359B
Application number: CN201410049557.4A
Authority: CN
Inventors: 李洋; 田亚飞; 杨晨阳; 黄伟才
Original assignee: Beijing Zhigu Ruituo Technology Services Co Ltd
Current assignee: Beijing Zhigu Ruituo Technology Services Co Ltd
Priority date: 2014-02-13
Filing date: 2014-02-13
Publication date: 2019-03-08
Anticipated expiration: 2034-02-13
Also published as: CN104853359A

Abstract

The embodiment of the invention provides a kind of heterogeneous network disturbance coordination method and interference coordination devices, are related to heterogeneous network technologies field.The described method includes: obtaining the first base station at least partly Downlink Control Information by the Physical Downlink Control Channel for listening to first base station；The interference strength that the second base station of current time slots will be subject in each time/frequency source block is predicted according to the Downlink Control Information；Interference coordination is carried out according to the interference strength of the prediction.The method and device of the embodiment of the present invention can make full use of the framework of existing heterogeneous network, and quick track channel change will not all significantly affect the power system capacity of each base station with realizing effective interference coordination.

Description

Heterogeneous network disturbance coordination method and interference coordination device

Technical field

Various embodiments of the present invention be related to heterogeneous network technologies field more particularly to a kind of heterogeneous network disturbance coordination method and Interference coordination device.

Background technique

In order to meet the demand of the data rate and higher covering quality that increase rapidly is wirelessly communicated now and be obviously improved Network performance, 3GPP proposed in the standardization of LTE-Advanced heterogeneous network (Heterogeneous Network, HetNet) technology.Heterogeneous network mixed deployment macro base station (Macro-BS), remote radio (RRH) and various low-power are small-sized Base-station node, such as femto base station (Pico BS), Home eNodeB (Femto BS) and relaying (Relay) (as shown in Figure 1, these Small base station is referred to collectively herein as micro-base station).These micro-base stations can voluntarily be disposed by operator deployment or user, with Macro base station shares same section of frequency spectrum, it is therefore intended that mitigates the load of macrocellular, improves the property of in-door covering and Cell Edge User Can, the spectrum efficiency in unit area is improved by spatial reuse.Meanwhile the quality of reception of wireless signal is also with transmitter The reduction of distance between receiver and enhanced.Heterogeneous network technologies can greatly improve the sky of the frequency spectrum in overlay area Between reusability, to provide higher message transmission rate for user.

Multilayer heterogeneous network has broken the honeycomb of traditionally high-sequential, and macrocell is nested with various cells, small There is no fixed shape, center of housing estate and such divide of cell edge increasingly to obscure in area.In this novel network frame Under, deep variation also has occurred in interference form.Inter-cell interference not only includes the same layer interference between Microcell, prior It is the cross-layer interference occurred between macrocell and Microcell.Since the transmission power between different layers base station differs greatly, across Layer interference also wants even more serious compared to same layer interference.Cross-layer interference is the big obstacle for hindering micro-base station expanded and universal.Across Layer interference is divided into synchronous interference and asynchronous interference.Synchronous interference refers between macro base station and macro user, between micro-base station and micro- user The interference generated (i.e. under synchronous regime) when synchronization is in upstream or downstream state simultaneously.Asynchronous interference refers mainly to macro base Standing, it is dry to generate (i.e. under asynchronous mode) when being respectively at different uplink and downlink states between macro user, micro-base station and micro- user It disturbs.

By taking TD-LTE system as an example, it is groundwork side using time division duplex (Time Division Duplex, TDD) Formula.3GPP agreement defines the configuration of 7 kinds of different uplink and downlink and special subframes, and TD-LTE system can use any of them one Kind configuration combination is to adapt to different uplink and downlink business demands.A kind of typical frame format 2(a as shown in the figure) shown in, wherein D Indicate that downlink subframe, U indicate that sub-frame of uplink, S indicate special subframe.For such structure, although under TDD mode, The number of subframes of uplink and downlink can be adjusted flexibly in one frame structure of triangular web according to demand, asymmetric business is provided It supports, but in entire heterogeneous network, still has to stringent synchronization between macro base station and macro user, micro-base station and micro- user.From this It is seen on a bit, this operating mode is unfavorable for the uplink and downlink structure deployment of whole heterogeneous network, can bring the whole utilization of resources Rate is low, the configuration of uplink and downlink structure is not flexible, be not able to satisfy instant uplink and downlink flow demand, information transmission time extends etc. asks Topic.

As shown in Fig. 2 (b), be the frame structure under asynchronous mode, macro base station and micro-base station can respectively by self-demand and Concrete condition arbitrarily selects uplink or downlink transfer, and dynamic configuration adjusts frame structure, has stronger instantaneity, makes entire The flexibility ratio of system is improved significantly with resource utilization.This also results in the possibility that a variety of interference generate: assuming that micro- base It stands and is receiving the uplink user from micro- user, and macro base station may emit downlink signal at this time, micro-base station is just differentiated Do not know whether the signal received comes from micro- user, because it is from micro- that it, which is easy to the signal from macro base station also to treat as, The signal of user, will result in strong jamming in this way；Similar, the uplink of micro- user can interfere macro user to receive macro base station hair The downlink signal sent；The uplink of macro user can interfere micro- user to receive the downlink signal that micro-base station is sent；Micro-base station is sent Downlink signal can interfere macro base station to receive the uplink signal from macro user.

It is different compared with the coordination of synchronous interference from the aspect of optimization overall network performance and uplink-downlink configuration flexibility ratio The coordination for walking interference has more real meaning to the raising of the utilization rate of system time frequency resource, but under asynchronous interference scene Interference problem also complex.Urgently effectively solve the problems, such as the scheme of the asynchronous interference of minizone under isomery scene.

Summary of the invention

Various embodiments of the present invention technical problems to be solved are: providing a kind of heterogeneous network disturbance coordination method and interference association The problem of adjusting device, asynchronous interference under isomery scene can be efficiently solved.

In order to solve the above technical problems, in a first aspect, the embodiment of the invention provides a kind of heterogeneous network interference coordination sides Method, which comprises

Physical Downlink Control Channel by listening to first base station obtains the first base station at least partly downlink control letter Breath；

Predict that the second base station of current time slots is dry by what is be subject in each time/frequency source block according to the Downlink Control Information Disturb intensity；

Interference coordination is carried out according to the interference strength of the prediction.

With reference to first aspect, in the first possible implementation, at least partly Downlink Control Information includes institute Stating first base station, there are the Downlink Control Information on the possible running time-frequency resource of asynchronous interference with second base station.

The possible implementation of with reference to first aspect the first, in the second possible implementation, the method Further include:

Obtain the time-frequency resource allocating information of the first base station；

Determining the first base station, there are the possible running time-frequency resources of asynchronous interference with second base station.

The possible implementation of second with reference to first aspect, in the third possible implementation, by described Backhaul link between first base station and second base station obtains the time-frequency resource allocating information.

The possible implementation of second with reference to first aspect, in the fourth possible implementation, by described Air interface between first base station and second base station obtains the time-frequency resource allocating information.

The 4th kind of possible implementation with reference to first aspect, in a fifth possible implementation, by described The physical down shared data channel of first base station obtains the time-frequency resource allocating information.

With reference to first aspect, in a sixth possible implementation, the method also includes:

The first base station and second base station there are on the possible running time-frequency resource of asynchronous interference, with the physics The corresponding seclected time period of downlink channel control signal does not do second base station ascending resource scheduling.

The 6th kind of possible implementation with reference to first aspect, it is described selected in the 7th kind of possible implementation Period is entire subframe corresponding with the physical downlink channel control signal.

The 6th kind of possible implementation with reference to first aspect, it is described selected in the 8th kind of possible implementation Period is the period corresponding with the physical downlink channel control signal in a subframe.

With reference to first aspect, it in the 9th kind of possible implementation, is predicted described according to the Downlink Control Information It the second base station of current time slots will be in the interference strength being subject in each time/frequency source block:

For dispatching not changed time/frequency source block, when the interference strength of prediction is that the scheduling is not changed The interference strength that frequency resource block is subject in a upper time slot；

For dispatching changed time/frequency source block, the interference strength of prediction is the changed time-frequency money of the scheduling The maximum interference intensity being subject in time slot before source block.

With reference to first aspect, described to be carried out according to the interference strength of the prediction in the tenth kind of possible implementation Interference coordination includes:

The ascending resource of second base station is dispatched according to the interference strength of the prediction.

The tenth kind of possible implementation with reference to first aspect, in a kind of the tenth possible implementation, described Include: according to the ascending resource that the interference strength of the prediction dispatches second base station

If the interference strength of the prediction is no more than pre-determined threshold, the corresponding time-frequency of interference strength of the prediction is dispatched Resource block；

If the interference strength of the prediction is more than pre-determined threshold, the corresponding time-frequency of interference strength of the prediction is not dispatched Resource block.

With reference to first aspect, in the 12nd kind of possible implementation, the interference strength according to the prediction into Row interference coordination includes:

The downlink resource of second base station is dispatched according to the interference strength of the prediction.

The 12nd kind of possible implementation with reference to first aspect, it is described in the 13rd kind of possible implementation Include: according to the downlink resource that the interference strength of the prediction dispatches second base station

With reference to first aspect, in the 14th kind of possible implementation, the interference strength according to the prediction into Row interference coordination includes:

Power control is carried out according to the interference strength of the prediction.

The 14th kind of possible implementation with reference to first aspect, it is described in the 15th kind of possible implementation Carrying out power control according to the interference strength of prediction includes:

Current time slots are carried out by the uplink channel estimation for second base station user being interfered；

Most according to the interference strength of the prediction, the uplink channel estimation, the second base station user uplink Small data rate demand calculates the uplink transmission power of second base station user.

The 14th kind of possible implementation with reference to first aspect, it is described in the 16th kind of possible implementation Carrying out power control according to the interference strength of prediction includes:

Current time slots are carried out to estimate the down channel for second base station being interfered；

It is transmitted according to the interference strength of the prediction, down channel estimation, second base station down the smallest Data-rate requirements calculate the down transmitting power of second base station.

The 15th with reference to first aspect or 16 kind of possible implementation, in the 17th kind of possible implementation In, it is described that interference coordination is carried out according to the interference strength of the prediction further include:

According to the transmission power and target error rate, modulation and coding strategy are formulated.

Second aspect, the embodiment of the invention provides a kind of heterogeneous network interference coordination device, described device includes:

One listens to module, obtains the first base station at least for the Physical Downlink Control Channel by listening to first base station Part Downlink Control Information；

One interference prediction module, for predicting the second base station of current time slots in each time-frequency according to the Downlink Control Information The interference strength being subject on resource block；

One interference coordination module, for carrying out interference coordination according to the interference strength of the prediction.

In conjunction with second aspect, in the first possible implementation, described device further include:

One obtains module, for obtaining the time-frequency resource allocating information of the first base station；

One determining module, for determining that there are the possible time-frequencies of asynchronous interference to provide for the first base station and second base station Source.

In conjunction with the first possible implementation of second aspect, in the second possible implementation, the acquisition Module obtains the time-frequency resource allocating information by the backhaul link between the first base station and second base station.

In conjunction with the first possible implementation of second aspect, in the third possible implementation, the acquisition Module obtains the time-frequency resource allocating information by the air interface between the first base station and second base station.

The third possible implementation with reference to first aspect, in the fourth possible implementation, the acquisition Module obtains the time-frequency resource allocating information by the physical down shared data channel of the first base station.

With reference to first aspect, in a fifth possible implementation, described device further include:

One scheduler module, for there are the possible running time-frequency resources of asynchronous interference with second base station in the first base station Above, second base station ascending resource scheduling is not done in seclected time period corresponding with the physical downlink channel control signal.

With reference to first aspect, in a sixth possible implementation, the interference prediction module:

With reference to first aspect, in the 7th kind of possible implementation, the interference coordination module includes:

One first coordination unit, for dispatching the second base station uplink/downlink resource according to the interference strength of the prediction.

The 7th kind of possible implementation with reference to first aspect, in the 8th kind of possible implementation, described first Coordination unit includes the interference strength in response to the prediction no more than pre-determined threshold, and the interference strength for dispatching the prediction is corresponding Time/frequency source block；Interference strength in response to the prediction is more than pre-determined threshold, does not dispatch the interference strength pair of the prediction The time/frequency source block answered.

In conjunction with second aspect, in the 9th kind of possible implementation, the interference coordination module includes:

One second coordination unit, for carrying out power control according to the interference strength of the prediction.

The 9th kind of possible implementation with reference to first aspect, in the tenth kind of possible implementation, described second Coordination unit includes:

One first channel estimation subelement, for carrying out current time slots for second base station user being interfered Row channel estimation；

One first power control subelement, for according to the interference strength of the prediction, uplink channel estimation, described The minimum data rate demand of second base station user uplink calculates the uplink transmission power of second base station user.

The 9th kind of possible implementation with reference to first aspect, in a kind of the tenth possible implementation, described Two coordination units include:

One second channel estimates subelement, believes the downlink for second base station being interfered for carrying out current time slots Road estimation；

One second power control subelement, for being estimated according to the interference strength of the prediction, the down channel, described The smallest data-rate requirements of second base station down transmission, calculate the down transmitting power of second base station.

The the tenth or the tenth a kind of possible implementation with reference to first aspect, in the 12nd kind of possible implementation In, the interference coordination module further include:

One third coordination unit, for formulating modulation and coding strategy according to the transmission power and target error rate.

The method and device of the embodiment of the present invention obtains the downlink control letter of interference base station by way of listening to PDCCH Breath, the resource scheduling information obtained using Downlink Control Information, is able to know that certain moment running time-frequency resource according to resource scheduling information The scheduling of block changes, and predicts the interference strength that the corresponding time/frequency source block of current time slots will be subject to, and then refers to the downlink control Information processed and the interference strength of prediction carry out effective interference coordination.Therefore, it can make full use of the frame of existing heterogeneous network Structure, quick track channel change is to realize effective interference coordination, while all to the power system capacity of first base station and the second base station It will not significantly affect.

Detailed description of the invention

Fig. 1 is the basic composed structure schematic diagram of heterogeneous network；

Fig. 2 (a) is a kind of frame format under the synchronous regime of LTE system；

Fig. 2 (b) is a kind of frame format under the asynchronous mode of LTE system；

Fig. 3 is the flow chart of the heterogeneous network disturbance coordination method of an embodiment of the present invention；

Fig. 4 is exemplary wireless frame structure figure used in LTE system；

Fig. 5 is the structure chart of downlink subframe in exemplary L TE system；

Fig. 6 is the process flow signal of PDCCH；

Fig. 7 (a) and Fig. 7 (b) is micro-base station ascending resource scheduling schematic diagram in the method for the embodiment of the present invention；

Fig. 8 is the structural schematic diagram of the heterogeneous network interference coordination device of an embodiment of the present invention；

Fig. 9 is the structural schematic diagram of the heterogeneous network interference coordination device of second of embodiment of the invention；

Figure 10 is the structural schematic diagram of the heterogeneous network interference coordination device of the third embodiment of the invention；

Figure 11 is that the first structure of interference coordination module in the heterogeneous network interference coordination device of the embodiment of the present invention is shown It is intended to；

Figure 12 is that second of structure of interference coordination module in the heterogeneous network interference coordination device of the embodiment of the present invention is shown It is intended to；

Figure 13 is that the third structure of interference coordination module in the heterogeneous network interference coordination device of the embodiment of the present invention is shown It is intended to；

Figure 14 is that the 4th kind of structure of interference coordination module in the heterogeneous network interference coordination device of the embodiment of the present invention is shown It is intended to；

Figure 15 is that the 5th kind of structure of interference coordination module in the heterogeneous network interference coordination device of the embodiment of the present invention is shown It is intended to；

Figure 16 is a kind of application scenarios schematic diagram of the method and apparatus of the embodiment of the present invention；

Figure 17 is the structural schematic diagram of the heterogeneous network interference coordination device of the 4th kind of embodiment of the invention.

Specific embodiment

With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below Example is not intended to limit the scope of the invention for illustrating the present invention.

In the following description, " base station " referring broadly to the random node of the network-side communicated with terminal, such as Node B, ENode B, base station, AP(access point) etc.." first base station " and " the second base station " can respectively refer to interference base station and interfered base station, And interfered base station and interference base station may respectively be macro base station and micro-base station or micro-base station and macro base station.Micro-base station includes following One or more of: the base station Pico, the base station Femto, the base station RRH etc..Macro base station and micro-base station are said broadly for opposite Method namely macro base station are the base station that coverage area is greater than micro-base station.

The embodiment of the invention provides a kind of heterogeneous network disturbance coordination method, it is particularly suitable for asynchronous shape in heterogeneous network Interference coordination under state between macro base station and micro-base station, this method can run on the second base station, or run independently of the second base station. As shown in figure 3, this method comprises:

S310. the first base station at least portion is obtained by listening to the Physical Downlink Control Channel (PDCCH) of first base station Divide Downlink Control Information (Downlink Control Information, DCI).

Downlink Control Information is that base station is generated before the transmission or reception upstream data for carrying out downlink data The modulation of uplink/downlink data and coding strategy, the resource scheduling scheme of allocated running time-frequency resource, Physical Resource Block (PRB) The acquisition of the control information of power control information etc., Downlink Control Information can prepare for interference coordination.It is above-mentioned at least partly Downlink Control Information is preferably that there are the downlink controls on the possible running time-frequency resource of asynchronous interference to believe for first base station and the second base station Breath.There are the possible running time-frequency resources of asynchronous interference to refer to the second base station for first base station: first base station distributes to first base station user With the second base station distribute to the second base station user have it is Chong Die and there are uplink and downlink timeslot interference running time-frequency resource.Certainly, It can be by listening to the Downlink Control Information obtained on whole running time-frequency resources.Downlink Control Information is to be broadcast to use by down channel Family, corresponding running time-frequency resource and modulating/demodulating, coding/decoding are used according to the Downlink Control Information received by user Data, micro-base station is also on the running time-frequency resource that it can receive the signal.Downlink Control Information is uploaded by down control channel Defeated downlink subframe carrying.

As shown in figure 4, in the frame structure shown in, a frame has wireless frame structure used in illustrative LTE system The length of 10ms and the subframe including ten with equal sizes.Each subframe has the length of 1ms and including two time slot, often A time slot has the length of 0.5ms.Time slot includes multiple orthogonal frequency division multiplexing (OFDM) symbol or single carrier frequency division in the time domain Multiple access (SC-FDMA) symbol and in a frequency domain include multiple resource blocks (RB).Above-mentioned frame structure is exemplary, and in nothing The OFDM symbol that includes in the quantity of the time slot for including in the quantity for the subframe for including in line frame, a subframe, each time slot or The quantity of SC-FDMA symbol can change in many ways.

Fig. 5 shows the structure of the downlink subframe in exemplary L TE system.As shown in figure 5, a downlink Frame includes two time slots in the time domain.Most three OFDM symbols in the front of first time slot in downlink subframe Corresponding to the control zone for being assigned control channel, remaining OFDM symbol, which corresponds to, is assigned Physical Downlink Shared Channel (PDSCH) data field is (if use conventional cyclic prefix (Cyclic Prefix, CP), first time slot of each subframe Preceding 1-3 OFDM symbol on can carry the physical resource of control channel, and can be shared with bearing downlink on remaining symbol The physical resource of channel PDSCH, according to longer CP, then in the 2-3 OFDM symbol of the first of each subframe time slot Carry the physical resource of control channel).Control zone corresponds to the downlink first layer/second layer (L1/L2) control signaling in subframe and passes Defeated part.The down control channel used in LTE system includes: physical control format indicator channel (PCFICH), object Manage hybrid automatic repeat request indication channel (PHICH), Physical Downlink Control Channel (PDCCH).Wherein, PCFICH is in subframe First OFDM symbol transmission indicates quantity (i.e. control zone size) phase that the OFDM symbol of PDCCH is transmitted in a subframe The information of pass.PHICH is used to carry acknowledgement/non-acknowledgement (ACK/NACK) feedback information of uplink transmission data.PHICH Number, time-frequency location can be as the system message and cell in the Physical Broadcast Channel (PBCH) of the descending carrier where PHICH ID is determined.PDCCH is for carrying DCI, including above-mentioned: uplink/downlink resource scheduling information, MCS, power control information and pre- Encoded information etc..Resource scheduling scheme refers to that, to the running time-frequency resource for having distributed to user, user should in which time use Running time-frequency resource.Different types of control information usually corresponds to different DCI sizes, and the format of DCI can be divided into several differences Format, carried by PDCCH, different DCI formats corresponds to the different information contents.In descending scheduling, resource scheduling scheme, MCS, power control information correspond to different DCI formats.

By listen to PDCCH be capable of fast tracking channel variation and to the power system capacity of first base station and the second base station not It will cause and significantly affect.After listening to PDCCH signal, desired control can just be obtained by needing to be decoded PDCCH signal Information.PDCCH includes the set of one or several continuous control channel units (CCE), and PDCCH format is PDCCH in object The mapping format in resource is managed, it is uncorrelated to the content of PDCCH.One PDCCH is transmitted on one or several continuous CCE. CCE is the logical allocation unit for providing the code rate of the state based on wireless channel for PDCCH.CCE corresponds to multiple Resource unit group.The format of PDCCH is determined according to the relevance between the quantity of CCE and the code rate provided by CCE With the quantity of the bit of available PDCCH.Base station determines PDCCH format according to by the DCI for being sent to user equipment, depends on negative Carrying capacity and channel condition etc..It is illustrated in figure 6 the process flow of PDCCH.Control information source bit adds cyclic redundancy school first It tests (CRC), CRC is scrambled by radio network temporary identifier (Radio Network Temporary Identifier, RNTI) , for different control information bit purposes, the type of RNTI is different, for transmitting the DCI of common control information, with random The scramblings such as (RA-RNTI), system information transmissions (SI-RNTI), paging (P-RNTI), power control (TPC-RNTI) are accessed, and The DCI of single user is directed to for transmitting, with semi-continuous scheduling (SPS-C-RNTI), the specific identifier cell ID of user equipment (C-RNTI) scrambling such as.After having added CRC, being operated by channel coding, rate-matched etc., multiple PDCCH multiplexings are transmitted together, The bit sequence of all PDCCH is linked in sequence, then with 2 He of scramble sequence modulus.Bit after scrambling carries out QPSK Modulation, layer map and the relevant operations such as precoding, resource impact, and modulation symbol is mapped to physical resource unit RE.

According to the forming process of above-mentioned PDCCH signal, carrying out reverse processing to the PDCCH signal listened to can be solved Its control information carried out.For example, can be carried in the case where unknown CCE number by blind decoding to decode PDCCH Information bit: CRC is successively descrambled according to user identity information (can obtain from time-frequency resource allocating information, be described later on), It whether is the corresponding control information of the user determine the PDCCH listened to carrying.The coding/decoding method of PDCCH signal is ability The mature technology in domain, this will not be repeated here.

S320. predict that the second base station of current time slots will be by each time/frequency source block according to the Downlink Control Information Interference strength.The method of the embodiment of the present invention can be pre- in conjunction with the interference strength of time slot before and the Downlink Control Information It measures the interference strength for the interference being subject in each time/frequency source block.

S330. interference coordination is carried out according to the interference strength of the prediction, for example, carrying out the scheduling of time/frequency source block, function Rate control etc., so that signal error rate is no more than target error rate.

To sum up, the method for the embodiment of the present invention obtains the downlink control letter of interference base station by way of listening to PDCCH Breath, the resource scheduling information obtained using Downlink Control Information, is able to know that certain moment running time-frequency resource according to resource scheduling information The scheduling of block changes, and predicts the interference strength that the corresponding time/frequency source block of current time slots will be subject to, and then refers to the downlink control Information processed and the interference strength of prediction carry out effective interference coordination.This method can make full use of the frame of existing heterogeneous network Structure, quick track channel change is to realize effective interference coordination, while all to the power system capacity of first base station and the second base station It will not significantly affect.

In view of the selected Downlink Control Information be the first base station and the second base station possible there are asynchronous interference when The Downlink Control Information of frequency resource, the method for the embodiment of the present invention further include:

S340. the time-frequency resource allocating information of the first base station is obtained.

The time-frequency resource allocating can be obtained by the backhaul link (backhaul) between first base station and the second base station Information, to efficiently use the huge advantage of the noiseless transmission of optical fiber large capacity, data transmission delay is small.Certainly, can also pass through Air interface between first base station and the second base station obtains the time-frequency resource allocating information, for example, passing through first base station PDSCH obtains the time-frequency resource allocating information, but not limited to this, PDSCH is used for bearing downlink user data, if using PDSCH obtains time-frequency resource allocating information, and the connection that can first establish first base station and the second base station namely the second base station are as use Family equipment accesses first base station, so that first base station can transmit above-mentioned time-frequency resource allocating information for the distribution of the second base station Resource.The time-frequency resource allocating information is the running time-frequency resource that each base station and user equipment establish connection time-division provisioned user equipment Some relevant informations wherein at least should include the identification information (C-RNTI) and its corresponding PRB of user equipment, may also include The every resource unit capacity of the CCE number and PDSCH of PDCCH (Transmit Energy per Resource Element, The information such as EPRE).

S350. determining the first base station, there are the possible running time-frequency resources of asynchronous interference with second base station.According to institute The time-frequency resource allocating information of the first base station of acquisition and the time-frequency resource allocating information of the second base station, are able to determine whether to deposit It is assigned to the user of first base station and the second base station simultaneously in identical Physical Resource Block, then judges whether there is uplink and downlink Time slot interference.

In addition, not by the second base station during in order to make to listen to first base station downlink PDCCH signal in step s310 The method of the interference of user uplink signal, the embodiment of the present invention may also include that

S360. the first base station and second base station there are on the running time-frequency resource of possible asynchronous interference, with The corresponding seclected time period of the first base station Downlink Control Information does not do the second base station ascending resource scheduling.Have speech, the choosing Section of fixing time can be entire subframe corresponding with the downlink channel control signal of the first base station, can also be in a subframe Period corresponding with the downlink channel control signal of the first base station, for example, structure according to figure 5, when this is selected Between Duan Weiyi subframe first three OFDM symbol.

The scheduling steps of step S360 can be executed periodically, for example, using one or more subframes as the period, and the period can Dynamic adjusts, and as shown in Figure 7 (a), executes scheduling steps (shown in oblique line) in even frame, and entire even frame is not dispatched； Or the scheduling steps can may be executed according to the second base station by the disturbed condition on the running time-frequency resource of asynchronous interference, example Such as, judge according to whether the Signal to Noise Ratio (SNR) of the upstream data of the second base station user on the running time-frequency resource is lower than a preset threshold Whether interference is excessive, or judges to do according to whether the bit error rate of the upstream data of the second base station user is higher than a preset threshold Disturb it is whether excessive, and then interfere it is excessive when execute the scheduling, with guarantee PDCCH signal accurately listen to, as shown in Figure 7 (b), Scheduling is executed in second, third and the tenth subframe, and its preceding 3 OFDM symbol (shown in oblique line) is not dispatched.Correspondingly, originally The method of inventive embodiments further includes that detection second base station is dry there are what is be subject on the running time-frequency resource of possible asynchronous interference The process disturbed.

Although the execution of above-mentioned scheduling is so that the second base station user uplink data rate has certain loss (for example, when each When first three OFDM symbol of subframe does not work as dispatcher, there are about 27% losses), but control information is successfully listened to due to passing through And interference coordination can be carried out accordingly, more preferably power control scheme, MCS etc. can be used in the transmission process of data, in turn Promote the entire throughput of network.

In step s 320, the scheduling variation of the interference strength and time/frequency source block of time slot before is needed to predict The interference strength being subject on each Physical Resource Block of current time slots:

For dispatching not changed time/frequency source block, (scheduling, which does not change, refers to that current time slots make with a upper time slot Do not changed with the user of the Physical Resource Block), the interference strength of prediction is equal to the not changed time-frequency money of the scheduling The interference strength that source block is subject in a upper time slot；

For dispatching changed time/frequency source block, the interference strength of prediction is equal to the changed time-frequency of scheduling The maximum interference intensity being subject in time slot before resource block.

It should be noted that in the method for the embodiment of the present invention, what the second base station was subject in each time/frequency source block Interference can be the interference from a user, it is also possible to be total interference from multiple users, that is, first base station is in the time-frequency Resource block scheduling multiple users (space divisions).

According to the difference of interference scene, the interference coordination in step S330 can be there are many mode.For example, in first base station Under the scene for the uplink signal that downlink transfer interferes the second base station to receive the second base station user, the interference coordination packet in step S330 It includes:

The ascending resource of second base station is dispatched according to the interference strength of the prediction.Have speech:

If the interference strength of the prediction is no more than pre-determined threshold, the corresponding time-frequency of interference strength of the prediction is dispatched Resource block, that is, the resource block can be used to carry out uplink for the corresponding user of the time/frequency source block；If the interference of the prediction Intensity is more than pre-determined threshold, then the corresponding time/frequency source block of interference strength of the prediction is not dispatched, that is, the time/frequency source block The unusable resource block of corresponding user carries out uplink.

Interference coordination in step S330 may also include that

Power control is carried out according to the interference strength of the prediction, a reasonable level is at, to meet second The data rate of base station user uplink reaches the smallest demand, and step S330 further comprises:

S331. current time slots are carried out by the uplink channel estimation of second base station user interfered by first base station. Any suitable method known in the art can be used in channel estimation.For example, using the specific reference signal (pilot tone of cell Or training sequence) or modulation reference signals carry out channel estimation.

S332. according to the interference strength I of the prediction, the uplink channel estimation h, the second given base station user uplink The smallest data rate r demand of transmission calculates the uplink transmission power of second base station user.It is calculated according to above-mentioned parameter The method of transmission power is for example:

It tables look-up and obtains the value of Signal to Interference plus Noise Ratio SINR required when data-rate requirements are r, then basis Transmission power P needed for the second base station user uplink can be calculated, wherein N is noise power.

In another example the downlink signal in the second base station of uplink interference the second base station user reception of first base station user Scene under, the interference coordination in step S330 further include:

The downlink resource of second base station is dispatched according to the interference strength of the prediction.Have speech: if the prediction Interference strength is no more than pre-determined threshold, then the corresponding time/frequency source block of interference strength of the prediction is dispatched, that is, when using this Frequency resource block sends downlink signal to corresponding second base station user；

If the interference strength of the prediction is more than pre-determined threshold, the corresponding time-frequency of interference strength of the prediction is not dispatched Resource block, that is, sending downlink signal to corresponding second base station user without using the time/frequency source block.

Interference coordination in step S330 may also include that

Carry out power control according to the interference strength of the prediction, be at one it is reasonable horizontal, to meet to the The data rate that two base station users send downlink signal reaches the smallest demand.And step S330 further comprises:

S333. it carries out current time slots to estimate the down channel for second base station being interfered, channel estimation methods Ibid；

S334. it is passed according to the interference strength of the prediction, down channel estimation, given second base station down Defeated the smallest data-rate requirements, calculate the down transmitting power of second base station, and calculation method can be same as above.

In addition, in embodiments of the present invention, while meeting above-mentioned transmission power, should also use the MCS to match To guarantee that the bit error rate is no more than target error rate, that is, the interference coordination in step S330 further include:

According to the transmission power and target error rate of acquisition, matching modulation and coding strategy.

In conclusion the method for the embodiment of the present invention is suitable for any asynchronous interference scene.

It will be understood by those skilled in the art that the serial number size of each step is not in the method for various embodiments of the present invention Mean the successive of execution sequence, the execution sequence of each step should be determined by its function and internal logic, without coping with the present invention The implementation process of specific embodiment constitutes any restriction.

The embodiment of the invention also provides a kind of heterogeneous network interference coordination devices, are particularly suitable for asynchronous in heterogeneous network Interference coordination under state between macro base station and micro-base station, the device can belong to the second base station, or for independently of the second base station Device.As shown in figure 8, the device 800 includes:

Module 810 is listened to, obtains the first base station extremely for the Physical Downlink Control Channel by listening to first base station Small part Downlink Control Information.Downlink Control Information is base station institute before the transmission or reception upstream data for carrying out downlink data The modulation including uplink/downlink data generated and coding strategy, the resource scheduling scheme of allocated running time-frequency resource, physical resource The acquisition of the control information of the power control information of block etc., Downlink Control Information can prepare for interference coordination.It is above-mentioned at least Part Downlink Control Information be preferably first base station with the second base station there are the downlink controls on the possible running time-frequency resource of asynchronous interference Information processed.There are the possible running time-frequency resources of asynchronous interference to refer to the second base station for first base station: first base station distributes to first base station User with the second base station distribute to the second base station user have it is Chong Die and there are uplink and downlink timeslot interference running time-frequency resource.When It so, can also be by listening to the Downlink Control Information obtained on whole running time-frequency resources.Downlink Control Information is wide by down channel It broadcasts to user, corresponding running time-frequency resource and modulating/demodulating, volume is used according to the Downlink Control Information received by user Code/decoding data, micro-base station is also on the running time-frequency resource that it can receive the signal.Downlink Control Information is controlled by downlink to be believed The downlink subframe carrying transmitted on road.

As shown in figure 4, in the frame structure shown in, a frame has wireless frame structure used in illustrative LTE system The length of 10ms and the subframe including ten with equal sizes.Each subframe has the length of 1ms and including two time slot, often A time slot has the length of 0.5ms.Time slot includes multiple OFDM symbols or SC-FDMA symbol and wraps in a frequency domain in the time domain Include multiple resource blocks.Above-mentioned frame structure is exemplary, and is wrapped in the quantity for the subframe for including in radio frames, a subframe The quantity of the OFDM symbol or SC-FDMA symbol that include in the quantity of the time slot included, each time slot can change in many ways.

Fig. 5 shows the structure of the downlink subframe in exemplary L TE system.As shown in figure 5, a downlink Frame includes two time slots in the time domain.Most three OFDM symbols in the front of first time slot in downlink subframe Corresponding to the control zone for being assigned control channel, remaining OFDM symbol correspond to be assigned PDSCH data field (if using Conventional cyclic prefix can carry the physics of control channel in the preceding 1-3 OFDM symbol of first time slot of each subframe Resource, and the physical resource of channel PDSCH can be shared on remaining symbol with bearing downlink, according to longer CP, then each The physical resource of control channel is carried in the 2-3 OFDM symbol of first time slot of subframe).Control zone corresponds in subframe Downlink first layer/second layer control signaling transmission part.The down control channel used in LTE system include: PCFICH, PHICH,PDCCH.Wherein, PCFICH is transmitted in first OFDM symbol of subframe, indicates to transmit PDCCH's in a subframe The relevant information of quantity (i.e. control zone size) of OFDM symbol.PHICH is used to carry the affirmative acknowledgement of uplink transmission data/no Determine response feedback information.The number of PHICH, time-frequency location can be as the system messages in the PBCH of the descending carrier where PHICH It is determined with cell ID.PDCCH is for carrying DCI, including above-mentioned: uplink/downlink resource scheduling information, MCS, power control information And precoding information etc..Resource scheduling scheme refers to the running time-frequency resource for having distributed to user, and user in which time Use the running time-frequency resource.Different types of control information usually corresponds to different DCI sizes, and the format of DCI can be divided into it is several The different format of kind, is carried, different DCI formats corresponds to the different information contents by PDCCH.In descending scheduling, resource tune Degree scheme, MCS, power control information correspond to different DCI formats.

By listen to PDCCH be capable of fast tracking channel variation and to the power system capacity of first base station and the second base station not It will cause and significantly affect.After listening to PDCCH signal, desired control can just be obtained by needing to be decoded PDCCH signal Information.PDCCH includes the set of one or several continuous CCE, and PDCCH format is mapping of the PDCCH on physical resource Format, it is uncorrelated to the content of PDCCH.One PDCCH is transmitted on one or several continuous CCE.CCE be for for PDCCH provides the logical allocation unit of the code rate of the state based on wireless channel.CCE corresponds to multiple resource unit groups. The format of PDCCH and available is determined according to the relevance between the quantity of CCE and the code rate provided by CCE The quantity of the bit of PDCCH.Base station determines PDCCH format according to by the DCI for being sent to user equipment, depends on load capacity and letter Road condition etc..It is illustrated in figure 6 the process flow of PDCCH.Control information source bit adds CRC first, and CRC is scrambled by RNTI , for different control information bit purposes, the type of RNTI is different, for transmitting the DCI of common control information, uses RA- RNTI, SI-RNTI, P-RNTI, TPC-RNTI etc. scrambling, and for transmit be directed to single user DCI, with semi-continuous scheduling, (the scrambling such as C-RNTI of user equipment.It after having added CRC, is operated by channel coding, rate-matched etc., multiple PDCCH multiplexings Transmit together, the bit sequence of all PDCCH is linked in sequence, then with 2 He of scramble sequence modulus.Bit after scrambling Progress QPSK modulation, layer map and the relevant operations such as precoding, resource impact, and modulation symbol is mapped to physical resource unit RE。

According to the forming process of above-mentioned PDCCH signal, carrying out reverse processing to the PDCCH signal listened to can be solved Its control information carried out.For example, can be carried in the case where unknown CCE number by blind decoding to decode PDCCH Information bit: CRC is successively descrambled according to user identity information (can obtain from time-frequency resource allocating information, be described later on), It whether is the corresponding control information of the user determine the PDCCH listened to carrying.PDCCH signal is decoded as this field Mature technology, this will not be repeated here.

Interference prediction module 820, for predicting the second base station of current time slots when each according to the Downlink Control Information The interference strength being subject on frequency resource block.Time slot before the interference prediction module 820 of the device of the embodiment of the present invention combines Interference strength and the Downlink Control Information can predict the interference strength being subject in each time/frequency source block.

Interference coordination module 830, for carrying out interference coordination according to the interference strength of the prediction, for example, carrying out time-frequency The scheduling of resource block, power control etc., so that signal error rate is no more than target error rate.

To sum up, the device of the embodiment of the present invention obtains the downlink control letter of interference base station by way of listening to PDCCH Breath, the resource scheduling information obtained using Downlink Control Information, is able to know that certain moment running time-frequency resource according to resource scheduling information The scheduling of block changes, and predicts the interference strength that the corresponding time/frequency source block of current time slots will be subject to, and then refers to the downlink control Information processed and the interference strength of prediction carry out effective interference coordination.The device can make full use of the frame of existing heterogeneous network Structure, quick track channel change is to realize effective interference coordination, while all to the power system capacity of first base station and the second base station It will not significantly affect.

In view of the selected Downlink Control Information be the first base station and the second base station possible there are asynchronous interference when The Downlink Control Information of frequency resource, as shown in figure 9, the device of the embodiment of the present invention further include:

Module 840 is obtained, for obtaining the time-frequency resource allocating information of the first base station.

When obtaining module 840 can obtain described by the backhaul link (backhaul) between first base station and the second base station Frequency resource allocation information, to efficiently use the huge advantage of the noiseless transmission of optical fiber large capacity, data transmission delay is small.When So, the time-frequency resource allocating letter can also be obtained by the air interface between first base station and the second base station by obtaining module 840 Breath, for example, the PDSCH by first base station obtains the time-frequency resource allocating information, but not limited to this, PDSCH is for carrying Down user data can first establish the company of first base station Yu the second base station if obtaining time-frequency resource allocating information using PDSCH It connects namely the second base station is as user equipment access first base station, so that first base station can be the distribution transmission of the second base station The resource of above-mentioned time-frequency resource allocating information.The time-frequency resource allocating information is distribution when connection is established in each base station and user equipment It wherein at least should include the C-RNTI and its corresponding object of user equipment to some relevant informations of the running time-frequency resource of user equipment Resource block is managed, may also include the CCE number and the every resource unit capacity of PDSCH (Transmit Energy per of PDCCH Resource Element, EPRE) etc. information.

Determining module 350, for determining the first base station, there are the possible time-frequencies of asynchronous interference with second base station Resource.According to the time-frequency resource allocating information of acquired first base station and the time-frequency resource allocating information of the second base station, energy It enough determines whether there is identical Physical Resource Block while being assigned to the user of first base station and the second base station, then judgement is It is no that there are uplink and downlink timeslot interference.

In addition, not used by the second base station to make to listen to during module 810 listens to first base station downlink PDCCH signal The interference of family uplink signal, as shown in Figure 10, the device of the embodiment of the present invention may also include that

Scheduler module 860, for there are the possible time-frequencies of asynchronous interference to provide with second base station in the first base station The second base station ascending resource tune is not done on source, in seclected time period corresponding with the physical downlink channel control signal Degree.Has speech, which can be entire subframe corresponding with the downlink channel control signal of the first base station, also It can be the period corresponding with the downlink channel control signal of the first base station in a subframe, for example, according to figure 5 Structure, the seclected time period are first three OFDM symbol of a subframe.

Scheduler module 860 can periodically execute above-mentioned scheduling, for example, using one or more subframes as the period, and the period It is dynamically adapted, as shown in Figure 7 (a), executes scheduling steps (shown in oblique line) in even frame, and entire even frame is not adjusted Degree；Or the scheduling steps can may be executed according to the second base station by the disturbed condition on the running time-frequency resource of asynchronous interference, For example, sentencing according to whether the Signal to Noise Ratio (SNR) of the upstream data of the second base station user on the running time-frequency resource is lower than a preset threshold Whether trunk snap disturbs excessive, or judges according to whether the bit error rate of the upstream data of the second base station user is higher than a preset threshold Whether interference is excessive, and then executes the scheduling when interfering excessive, to guarantee accurately listening to for PDCCH signal, such as Fig. 7 (b) institute Show, executes scheduling in second, third and the tenth subframe, and its preceding 3 OFDM symbol (shown in oblique line) is not dispatched.Accordingly Ground, the device of the embodiment of the present invention further include detection second base station there are on the running time-frequency resource of possible asynchronous interference by Interference module.

Interference prediction module 820 needs the scheduling variation of the interference strength and time/frequency source block of time slot before come pre- Survey the interference strength being subject on each Physical Resource Block of current time slots:

It should be noted that in the device of the embodiment of the present invention, what the second base station was subject in each time/frequency source block Interference can be the interference from a user, it is also possible to be total interference from multiple users, that is, first base station is in the time-frequency Resource block scheduling multiple users (space divisions).

A variety of interference coordination modes can be used in interference coordination module 830, and correspondingly, interference coordination module 830 can be by not Same unit is constituted: as shown in figure 11, interference coordination module 830 may include the first coordination unit 831, for according to the prediction Interference strength dispatch the second base station uplink/downlink resource.As shown in figure 12, interference coordination module 830 may also include that second Coordination unit 832, for being at a reasonable level according to the interference strength of prediction progress power control, with The data rate for meeting uplink/downlink transmission reaches the smallest demand.

According to the difference of interference scene, each unit of interference coordination module 830 can also have different composition and/or work With.

For example, receiving the scene of the uplink signal of the second base station user in the second base station of downlink transfer interference of first base station Under, the first coordination unit 831 is used to dispatch the ascending resource of second base station according to the interference strength of the prediction.Tool speech It:

If the interference strength of the prediction is no more than pre-determined threshold, the first coordination unit 831 dispatches the dry of the prediction The corresponding time/frequency source block of intensity is disturbed, that is, the resource block can be used to carry out uplink for the corresponding user of the time/frequency source block； If the interference strength of the prediction is more than pre-determined threshold, the first coordination unit 831 does not dispatch the interference strength pair of the prediction The time/frequency source block answered, that is, the unusable resource block of the corresponding user of the time/frequency source block carries out uplink.

And as shown in figure 13, the second coordination unit 832 includes:

First channel estimation subelement 8321, second base that will be interfered by first base station for carrying out current time slots It stands the uplink channel estimation of user.Any suitable method known in the art can be used in channel estimation.For example, using small The specific reference signal in area (pilot tone or training sequence) or modulation reference signals carry out channel estimation.

First power control subelement 8322, for according to the interference strength I of the prediction, the uplink channel estimation h, The smallest data rate r demand of the second given base station user uplink calculates the uplink hair of second base station user Penetrate power.The method of transmission power is calculated for example according to above-mentioned parameter:

In another example the downlink signal in the second base station of uplink interference the second base station user reception of first base station user Scene under, first coordination unit 831 is used to dispatch the downlink of second base station according to the interference strength of the prediction Resource.Have speech: if the interference strength of the prediction is no more than pre-determined threshold, the interference strength for dispatching the prediction is corresponding Time/frequency source block, that is, sending downlink signal to corresponding second base station user using the time/frequency source block；

And as shown in figure 14, the second coordination unit 832 can include:

Second channel estimates subelement 8323, for carrying out current time slots for the downlink for second base station being interfered Channel estimation, channel estimation methods are the same as the first channel estimation subelement 8321.

Second power control subelement 8324, for the interference strength according to the prediction, down channel estimation, institute The smallest data-rate requirements of the second base station down transmission are stated, the down transmitting power of second base station, calculating side are calculated Method can be the same as the first power control subelement 8322.

In addition, in embodiments of the present invention, while meeting above-mentioned transmission power, should also use the MCS to match To guarantee that the bit error rate is no more than target error rate, that is, as shown in figure 15, the interference coordination module 830 further include:

Third coordination unit 833, for formulating modulation and coding plan according to the transmission power and target error rate Slightly.

In conclusion the device of the embodiment of the present invention is suitable for any asynchronous interference scene.

In the following, further illustrating various embodiments of the present invention with scene shown in Figure 16.In the scene shown in Figure 16, the first base Standing is macro base station, and the second base station is micro-base station, and since uplink/downlink frames are asynchronous in time, micro-base station is being received from micro- use The uplink signal at family, and macro base station is sending downlink signal to macro user at this time, micro-base station will differentiate the letter do not known and received Number whether come from micro- user because it is the signal from micro- user that it, which is easy to the signal from macro base station also to treat as, this There are strong jammings under scene.The device of the embodiment of the present invention runs on micro-base station, is a part of micro-base station, or independently of micro- base It stands, the process for carrying out interference coordination using the method for the embodiment of the present invention is as follows:

1) the initial time-frequency resource allocating information of macro base station is obtained by the backhaul link between micro-base station and macro base station, and Determine the running time-frequency resource that may be subjected to macro base station interference.Whether simultaneously its method is: looking first at identical Physical Resource Block quilt Macro base station and micro-base station distribute to respective user, then judge whether there is uplink and downlink timeslot interference.There may be interference when Frequency resource block can change, and can be known by listening to PDCCH.

2) on the running time-frequency resource there may be interference (preceding 3 OFDM symbols of subframe are not dispatched), pass through limitation pair The uplink scheduling of micro- user correctly listens to the content of macro base station PDCCH and obtains Downlink Control Information by decoding.If no The CCE number of PDCCH is obtained, it can be all in common search section and the specific region of search search of UE by the way of blind decoding Possible PDCCH simultaneously attempts to be decoded acquisition Downlink Control Information.

3) it according to Downlink Control Information obtained, can be determined in real time according to Downlink Control Information obtained:

The dispatch situation of the Physical Resource Block of macro base station；

The power of each macro base station user on each Physical Resource Block；

The case where antenna beam distributes；

Identified parameter is that subsequent coordination is prepared.

4) interference strength of time slot predicts that current time slots micro-base station will be by each Physical Resource Block before Interference strength from macro base station.In time slot before, macro base is only received when micro-base station does not receive the uplink signal of micro- user When the interference stood, the interference strength of the time slot can be obtained by the power that estimation receives signal.According to before these time slot it is dry The interference strength that the i.e. predictable current time slots of intensity will be subject to is disturbed, such as:

It may determine that user using which time/frequency source block and upper one by acquired time-frequency resource allocating information Time slot is compared to there is no variations.Then, selecting these scheduling, there is no the time/frequency source blocks of variation, and according to one thereon Jamming power size I that time slot micro-base station receives, to predict that current time slots micro-base station will be subject in the time/frequency source block Interference strength is still I.

For the time/frequency source block that those scheduling are changed, can be subject to most by t time slot micro-base station before The interference that big interference strength carrys out conservative prediction current time slots is I=max { I_i, i=1,2..., t, wherein I_iBefore expression Interference strength I suffered by i-th of time slot micro-base station_iIt scheduled multiple users (space division) in the time/frequency source block including macro base station Possibility, i.e. I_iIt both may be the interference of a user of macro base station scheduling, it is also possible to scheduled total interference of multiple users.

5) according to the above-mentioned prediction to the interference strength in time/frequency source block, by adjusting the ascending resource scheduling of micro-base station To avoid interference.Specific method is whether micro-base station is greater than a certain thresholding according to the interference strength size of the macro base station of prediction η, to decide whether to receive signal on the running time-frequency resource: if interference strength is no more than a certain thresholding (I≤η), micro- user Uplink can be carried out using the running time-frequency resource；Otherwise, micro- user cannot use the downlink of running time-frequency resource avoidance macro base station Interference.

6) according to the prediction of the interference strength in above-mentioned time/frequency source block, it is arranged by power control and MCS, so that they It is reasonable horizontal in one, reach the smallest demand r to meet the data transfer rate R of micro- user uplink signal, method particularly includes:

Micro- user uplink channel h that micro-base station is known using a upper time slot, it is estimated that micro- user of current time slots Up channel (be still h because the change in location of micro- user and it is unhappy).According to the interference strength I of prediction, micro- user uplink Channel estimation h, and the smallest data rate requirements r of given micro- user uplink transmission, to carry out the uplink function of micro- user Rate control:

It tables look-up and obtains the value of Signal to Interference plus Noise Ratio SINR required when data rate requirements are r, then basisI.e. Micro- user uplink transmission power P can be calculated, wherein N is noise power.

While meeting above-mentioned uplink transmission power, also it should guarantee that the bit error rate is no more than using the MCS to match Target error rate.

Further, after using the method and apparatus of the embodiment of the present invention, micro-base station will determine corresponding receiver parameters, To realize preferable interference coordination effect.Such as:

1) by the information of the above-mentioned PDCCH listened to, the physical resource block dispatching situation of macro base station is obtained and at certain The precoding vectors v of macro user i on Physical Resource Block (assuming that dispatching n macro users simultaneously)_i, i=1,2 ..., n.

2) micro-base station using the specific reference signal of cell without estimation macro base station in the case where accessing macro base station to micro- The interference channel matrix H of base station.

3) the corresponding receiver algorithm of micro-base station is selected according to different criterion, to achieve the purpose that inhibit interference. For example, the corresponding vector that detects is expressed as if selection least mean-square error (MMSE) criterionWherein P is micro- user uplink transmission power, and N is noise power, and I is single Position battle array, n are the macro number of users of macro base station scheduling in the time/frequency source block, and h is the method and/or device using the embodiment of the present invention Carry out the micro- user uplink channel vector obtained when channel estimation.If selecting force zero (ZF) criterion, the corresponding vector u that detects is answered For interference covariance battle arrayKernel (micro-base station antenna number N need to meet N >=n+1).

To sum up, it can be realized effective interference coordination using the method and device of the embodiment of the present invention.

It should be noted that the interference coordination of other asynchronous interference scenes can refer to examples detailed above, this will not be repeated here.Example Such as: in the scene for the downlink transfer that the uplink of micro- user interferes macro user to receive macro base station, micro-base station can be listened to Then PDCCH dispatches the Physical Resource Block that macro user uses, to avoid the interference of micro- user uplink；The uplink of macro user It interferes micro- user to receive in the downlink signal scene that micro-base station is sent, the PDCCH of macro base station can be listened to, to dispatch micro- user Physical Resource Block used is to avoid macro user's bring interference；Micro-base station sends downlink signal interference macro base station to micro- user and connects Receive in the uplink signal scene of macro user, the PDCCH of micro-base station can be listened to, thus make macro user uplink emit when use with it is micro- The different Physical Resource Block of base station down.Power control and MCS setting refer to examples detailed above, and this will not be repeated here.

It as shown in figure 17, is another heterogeneous network interference coordination device 1700 of the present invention also embodiment, present invention tool Body embodiment does not limit the specific implementation of device 1700.As shown in figure 17, which may include:

Processor (processor) 1710,1720, memory communication interface (Communications Interface) (memory) 1730 and communication bus 1740.Wherein:

Processor 1710, communication interface 1720 and memory 1730 complete mutual lead to by communication bus 1740 Letter.

Communication interface 1720, for being communicated with the network element of such as client etc..

Processor 1710 can specifically execute the phase in above-mentioned embodiment of the method shown in FIG. 1 for executing program 1732 Close step.

Specifically, program 1732 may include program code, and said program code includes computer operation instruction.

Processor 1710 may be a central processor CPU or specific integrated circuit ASIC(Application Specific Integrated Circuit), or be arranged to implement the integrated electricity of one or more of the embodiment of the present invention Road.

Memory 1730, for storing program 1732.Memory 1730 may include high speed RAM memory, it is also possible to also Including nonvolatile memory (non-volatile memory), for example, at least a magnetic disk storage.Program 1732 specifically makes The device 1700 executes following steps:

The specific implementation of each unit may refer to corresponding steps or unit in each embodiment above in program 1732, herein It repeats no more.

Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure Member and method and step can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed The scope of the present invention.

It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer module (can be a People's computer, server or network module etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention. And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.

The above embodiments are only used to illustrate the present invention, and not limitation of the present invention, in relation to the common of technical field Technical staff can also make a variety of changes and modification without departing from the spirit and scope of the present invention, therefore all Equivalent technical solution also belongs to scope of the invention, and scope of patent protection of the invention should be defined by the claims.

Claims

1. a kind of heterogeneous network disturbance coordination method, which is characterized in that the described method includes:

Physical Downlink Control Channel by listening to first base station obtains the first base station at least partly Downlink Control Information；

Predict that the second base station of current time slots is strong by the interference being subject in each time/frequency source block according to the Downlink Control Information Degree；

Interference coordination is carried out according to the interference strength of the prediction；

Predict that current time slots the second base stations will be subject in each time/frequency source block according to the Downlink Control Information described In interference strength:

For dispatching not changed time/frequency source block, the interference strength of prediction is the not changed time-frequency money of the scheduling The interference strength that source block is subject in a upper time slot；

For dispatching changed time/frequency source block, the interference strength of prediction is the changed time/frequency source block of scheduling The maximum interference intensity being subject in time slot before.

2. the method according to claim 1, wherein at least partly Downlink Control Information includes described first There are the Downlink Control Information on the possible running time-frequency resource of asynchronous interference with second base station for base station.

3. according to the method described in claim 2, it is characterized in that, the method also includes:

4. according to the method described in claim 3, it is characterized in that, by between the first base station and second base station Backhaul link obtains the time-frequency resource allocating information.

5. according to the method described in claim 3, it is characterized in that, by between the first base station and second base station Air interface obtains the time-frequency resource allocating information.

6. according to the method described in claim 5, it is characterized in that, the physical down shared data by the first base station is believed Road obtains the time-frequency resource allocating information.

7. the method according to claim 1, wherein the method also includes:

The first base station and second base station there are on the possible running time-frequency resource of asynchronous interference, with the physical down The corresponding seclected time period of control channel signal does not do second base station ascending resource scheduling.

8. the method according to the description of claim 7 is characterized in that the seclected time period is to control to believe with the physical down The corresponding entire subframe of road signal.

9. the method according to the description of claim 7 is characterized in that the seclected time period be in subframe with the physics The downlink channel control signal corresponding period.

10. the method according to claim 1, wherein the interference strength according to the prediction is interfered Coordination includes:

11. according to the method described in claim 10, it is characterized in that, described according to the scheduling of the interference strength of the prediction The ascending resource of second base station includes:

If the interference strength of the prediction is no more than pre-determined threshold, the corresponding running time-frequency resource of interference strength of the prediction is dispatched Block；

If the interference strength of the prediction is more than pre-determined threshold, the corresponding running time-frequency resource of interference strength of the prediction is not dispatched Block.

12. the method according to claim 1, wherein the interference strength according to the prediction is interfered Coordination includes:

13. according to the method for claim 12, which is characterized in that described according to the scheduling of the interference strength of the prediction The downlink resource of second base station includes:

14. the method according to claim 1, wherein the interference strength according to the prediction is interfered Coordination includes:

15. according to the method for claim 14, which is characterized in that described to carry out power control according to the interference strength of prediction Include:

According to the interference strength of the prediction, the uplink channel estimation, the minimum number of the second base station user uplink According to rate requirement, the uplink transmission power of second base station user is calculated.

16. according to the method for claim 14, which is characterized in that described to carry out power control according to the interference strength of prediction Include:

According to the interference strength of the prediction, the smallest data of down channel estimation, second base station down transmission Rate requirement calculates the down transmitting power of second base station.

17. method according to claim 15 or 16, which is characterized in that described to be carried out according to the interference strength of the prediction Interference coordination further include:

18. a kind of heterogeneous network interference coordination device, which is characterized in that described device includes:

One listens to module, obtains the first base station at least partly for the Physical Downlink Control Channel by listening to first base station Downlink Control Information；

One interference prediction module, for predicting the second base station of current time slots in each running time-frequency resource according to the Downlink Control Information The interference strength being subject on block；

One interference coordination module, for carrying out interference coordination according to the interference strength of the prediction；

The interference prediction module:

19. device according to claim 18, which is characterized in that described device further include:

One determining module, for determining the first base station, there are the possible running time-frequency resources of asynchronous interference with second base station.

20. device according to claim 19, which is characterized in that the acquisition module by the first base station with it is described Backhaul link between second base station obtains the time-frequency resource allocating information.

21. device according to claim 19, which is characterized in that the acquisition module by the first base station with it is described Air interface between second base station obtains the time-frequency resource allocating information.

22. device according to claim 21, which is characterized in that the acquisition physics of the module by the first base station Downlink shared data channel obtains the time-frequency resource allocating information.

23. device according to claim 18, which is characterized in that described device further include:

One scheduler module, for the first base station and second base station there are the possible running time-frequency resource of asynchronous interference, Second base station ascending resource scheduling is not done in seclected time period corresponding with the physical downlink channel control signal.

24. device according to claim 18, which is characterized in that the interference coordination module includes:

25. device according to claim 24, which is characterized in that first coordination unit includes in response to the prediction Interference strength be no more than pre-determined threshold, dispatch the corresponding time/frequency source block of interference strength of the prediction；In response to described pre- The interference strength of survey is more than pre-determined threshold, does not dispatch the corresponding time/frequency source block of interference strength of the prediction.

26. device according to claim 18, which is characterized in that the interference coordination module includes:

27. device according to claim 26, which is characterized in that second coordination unit includes:

One first channel estimation subelement believes the uplink for second base station user being interfered for carrying out current time slots Road estimation；

One first power control subelement, for according to the interference strength of the prediction, the uplink channel estimation, described second The minimum data rate demand of base station user uplink calculates the uplink transmission power of second base station user.

28. device according to claim 26, which is characterized in that second coordination unit includes:

One second channel estimates subelement, estimates the down channel for second base station being interfered for carrying out current time slots Meter；

One second power control subelement, for the interference strength according to the prediction, down channel estimation, described second The smallest data-rate requirements of base station down transmission, calculate the down transmitting power of second base station.

29. the device according to claim 27 or 28, which is characterized in that the interference coordination module further include: