CN102340370B - Transmission method and system of physical downlink control channel - Google Patents

Abstract

The invention discloses a transmission method and a system of a physical downlink control channel. The method comprises the steps that a transmitting side conducts convolution code coding to downlink control information according to preset coding speed and conducts modulation, pre-coding and reprocessing; for each transmitting antenna, reference signals and data which is obtained after reprocessing are mapped to the physical resource blocks of the transmitting antenna according to preset control channel elements occupied by the physical downlink control channel and then are transmitted; each receiving antenna conducts resource extraction to the received data and reference signals according to a blind detection rule; space channel vectors from a serving base station and an interference base station to the receiving antenna are calculated according to the reference signals obtained after resource extraction and further space channel matrices are obtained; interference elimination matrices based on a pre-coding scheme are constructed according to the space channel matrices; and data transmitted by the interference base station is eliminated according to the interference elimination matrices and a detection criteria, and the downlink control information is obtained through a modulation method and processing inverse to the convolution code coding processing.

Description

The transmission method of Physical Downlink Control Channel and system

Technical field

The present invention relates to the communications field, relate in particular to a kind of transmission method and system, the dispensing device of Physical Downlink Control Channel and receiving system of Physical Downlink Control Channel of Physical Downlink Control Channel.

Background technology

There is very large difference at center of housing estate and cell edge in the data transfer rate that existing cell mobile communication systems provides, this species diversity not only can affect the capacity of whole system, and larger difference appears in the service quality that can cause user to obtain in different positions, experience thereby affect user.Therefore, a lot of wireless communication systems all will improve cell-edge performance as one of main demand parameter.

Interference (Inter-Cell Interference, referred to as ICI) between community is an intrinsic problem of cell mobile communication systems, and traditional solution is mainly the multiplexing mode of proportion.In the time carrying out channeling, multiplexing coefficient only has specific several value available, for example, can select 1,3,7 etc.Wherein, in the time that multiplexing coefficient equals 1, represent that neighbor cell is all used identical frequency resource, now, very serious in the interference meeting of cell edge, if adopt larger multiplexing coefficient, for example, adopt 3 or 7, can effectively suppress ICI, but spectrum efficiency now will correspondingly be reduced to 1/3 or 1/7 of former spectrum efficiency.

Long Term Evolution (Long Term Evolution, referred to as LTE) and follow-up system is (for example, the systems such as LTE-Advanced) adopt Physical Downlink Control Channel (Physical Downlink ControlChannel, referred to as PDCCH).This channel is used for transmitting Downlink Control Information (Downlink ControlInformation, referred to as DCI), in DCI, mainly comprise running time-frequency resource, modulation and encoding scheme (the Modulation and Coding Scheme that down link uses, referred to as MCS), mixed automatic retransfer request (Hybrid Automatic Repeat reQuest, referred to as HARQ) process, power control and 1/ layer of 2 signaling of most layer.

In when communication, PDCCH occupies the top n OFDM symbol of subframe, N value can be l, 2,3 or the concrete numerical value of 4, N can in PCFICH (Physical Control Format Indicator Channel, referred to as PCFICH), indicate.

PDCCH channel is carried by control channel particle (Control Channel Elements, referred to as CCE).A CCE is made up of 9 resource element groups (Resource element Groups, referred to as REG).Conventionally, can select 1,2,4 or 8 CCE to carry PDCCH channel.In order to ensure the performance of PDCCH channel, need to select suitable CCE type, to adjust the code rate of DCI, thereby obtain better systematic function.The channel quality information that the quantity of the CCE of user's PDCCH channel occupancy can report according to subscriber equipment (User Equipment, referred to as UE) distributes.

In the situation that cell edge exists presence of intercell interference, can adopt the mode that reduces PDCCH bit rate, to gain to come anti-interference by merging.

But, if in the situation of the strong presence of intercell interference of existence of cell edge, strong jamming meeting has a strong impact on reference signal and data-signal, and PDCCH signal also can be subject to the interference of the control channel of other base stations, even if CCE is 8, code rate is 0.1, UE still cannot correctly detect and obtain PDCCH signal, and the data message that causes UE cannot demodulation to be distributed by network side, affects the communication of UE, need base station to retransmit this information, can increase data delay and overhead.

Thereby for causing recipient to affect the problem that normal UE communicates by letter by demodulation Downlink Control Information because PDCCH is subject to strong presence of intercell interference in correlation technique, effective solution is not yet proposed at present.

Summary of the invention

Thereby for causing recipient cannot demodulation Downlink Control Information to affect the problem of recipient's proper communication because Physical Downlink Control Channel is subject to strong presence of intercell interference in correlation technique, the present invention proposes a kind of transmission method and system, the dispensing device of Physical Downlink Control Channel and receiving system of Physical Downlink Control Channel of Physical Downlink Control Channel, can effectively eliminate and reduce the impact of presence of intercell interference on Physical Downlink Control Channel, make recipient can correctly detect and receive physical downlink channel control signal.

Technical scheme of the present invention is achieved in that

According to an aspect of the present invention, provide a kind of transmission method of Physical Downlink Control Channel, the method is for realizing the transmission of at least one antenna and the reception of at least one antenna of Physical Downlink Control Channel.

The method comprises: transmit leg carries out convolution coding processing according to predetermined code rate to Downlink Control Information; Described transmit leg is modulated the data that obtain after encoding according to predetermined modulation system; Described transmit leg carries out precoding processing according to predetermined pre-coding scheme to the data after modulating; The data of the each transmitting antenna of described transmit leg after to precoding processing are carried out reprocessing, wherein, the control channel particle length that the order of modulation of the number of times of reprocessing, described code rate and described modulation system is taken by Physical Downlink Control Channel and the length of described Downlink Control Information are determined; For each transmitting antenna, the data-mapping that the control channel particle position that described transmit leg takies according to predetermined Physical Downlink Control Channel obtains with reference to signal with after reprocessing arrives the Physical Resource Block of this transmitting antenna, and sends described data and reference signal after mapping; Each reception antenna of recipient carries out the resource extraction of Physical Downlink Control Channel to the data that receive separately and reference signal according to blind check rule; Described each reception antenna extracts according to the resource of Physical Downlink Control Channel the reference signal obtaining and calculates serving BS under described recipient and the interference base station space channel vector to this reception antenna of recipient, and obtains the spatial channel matrix of Physical Downlink Control Channel to the space channel vector of recipient's all or part reception antenna according to described serving BS and interference base station; Described recipient is according to the spatial channel matrix of described Physical Downlink Control Channel, the interference cancellation matrix of the Physical Downlink Control Channel of structure based on described predetermined pre-coding scheme, wherein, the interference cancellation matrix of described Physical Downlink Control Channel is that feature is carried out modeling and obtained according to described predetermined pre-coding scheme, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station; Described recipient eliminates according to the interference cancellation matrix of described Physical Downlink Control Channel and predetermined detection criteria the data that described interference base station sends, and obtains described Downlink Control Information according to contrary processing of described predetermined modulation system and described convolution coding processing.

Wherein, the spatial channel matrix that obtains Physical Downlink Control Channel to the space channel vector of recipient's all or part reception antenna according to described serving BS and interference base station comprises: the resource of Physical Downlink Control Channel is extracted to the serving BS that obtains with described each reception antenna and the reference signal of interference base station separates and estimates, obtain the physical channel of all transmitting antennas to this reception antenna of recipient, according to reprocessing mode, the physical channel of estimating is arranged, form the space channel vector of the Physical Downlink Control Channel that this reception antenna is corresponding, described recipient arranges space channel vector corresponding to the reception antenna of all or part according to the sequence number of reception antenna, forms the spatial channel matrix of described Physical Downlink Control Channel.

And, before the data-mapping obtaining with reference to signal with after reprocessing arrives the Physical Resource Block of this transmitting antenna, the method also comprises: interweave to repeating data after treatment according to predetermined interleaving scheme, and data after interweaving are as data to be mapped;

And, the resource that described each reception antenna carries out Physical Downlink Control Channel according to described blind check rule to the data that receive separately and reference signal extracts and comprises: described recipient carries out resource extraction to the data that receive, and the data that described resource extracted according to described predetermined interleaving scheme are carried out contrary interweaving;

And before the physical channel of according to reprocessing mode, each reception antenna being estimated described recipient is arranged, the method further comprises: according to described predetermined interleaving scheme, the physical channel of estimating is carried out to contrary interweaving.

In addition, the interference cancellation matrix of the Physical Downlink Control Channel of structure based on described predetermined pre-coding scheme comprises: according to the number of the number of described predetermined pre-coding scheme, described transmit leg transmitting antenna, described recipient's reception antenna, the data after precoding processing are carried out the number of times of reprocessing and the number of described interference base station and determined the dimension of described interference cancellation matrix; And

For the each channel element in described spatial channel matrix, determine the first dimension sequence number of this channel element in described interference cancellation matrix according to the sequence number of the sequence number of the sequence number of the reception antenna of this channel element, transmitting antenna, reprocessing and described predetermined pre-coding scheme, and determine the second dimension sequence number of this channel element in described interference cancellation matrix according to the sequence number of the base station sequence number of this channel element, transmitting antenna and described predetermined pre-coding scheme.

In addition, the order of modulation M of the times N of reprocessing, described code rate R, described modulation system, control channel particle length O that Physical Downlink Control Channel takies and the length I of described Downlink Control Information meet the following conditions:

The method can also comprise: according to the number of described interference base station, pre-determine the times N of the data after described precoding processing being carried out to reprocessing, wherein, N >=B+1, the number that B is interference base station.

In addition, at the data-mapping obtaining with reference to signal and after reprocessing during to the Physical Resource Block of this transmitting antenna, serving BS and interference base station adopt the resource mapping scheme of identical Physical Downlink Control Channel.

Before the data-mapping obtaining after reprocessing is arrived the Physical Resource Block of this transmitting antenna by described transmit leg, the method also comprises: described transmit leg is according to the resource mapping scheme of described predetermined Physical Downlink Control Channel, the resource location of the required mapping of reference signal to described serving BS and interference base station is reserved, wherein, in mapping process, reserved resource location is only for mapping reference signal.

In addition,, in the situation that described transmit leg utilizes single transmitting antenna to carry out Physical Downlink Control Channel transmission, described predetermined pre-coding scheme is single antenna delivery plan; In the situation that described transmit leg utilizes multiple transmitting antennas to carry out Physical Downlink Control Channel transmission, described predetermined pre-coding scheme is transmission diversity delivery plan.

Alternatively, described predetermined detection criterion comprises one of following: maximum likelihood, least mean-square error, least square method.

According to a further aspect in the invention, a kind of transmission system of Physical Downlink Control Channel is provided, this system is for realizing the transmission of at least one antenna and the reception of at least one antenna of Physical Downlink Control Channel, and described system comprises dispensing device and receiving system.

Described dispensing device comprises: coding module, for Downlink Control Information being carried out to convolution coding processing according to predetermined code rate; Modulation module, for modulating the data that obtain after encoding according to predetermined modulation system; Precoding module, for carrying out precoding processing according to predetermined pre-coding scheme to the data after modulating; Replicated blocks, for the data of the each transmitting antenna after precoding processing are carried out to reprocessing, wherein, the control channel particle length that the order of modulation of the number of times of reprocessing, described code rate and described modulation system is taken by Physical Downlink Control Channel and the length of described Downlink Control Information are determined; Mapping block, for for each transmitting antenna, the data-mapping that the control channel particle position taking according to predetermined Physical Downlink Control Channel obtains with reference to signal with after reprocessing is to the Physical Resource Block of this transmitting antenna; At least one transmitting antenna, for sending described data and the reference signal after mapping;

Described receiving system comprises: at least one reception antenna, wherein, each reception antenna extracts for the resource of the data that receive separately and reference signal being carried out to Physical Downlink Control Channel according to blind check rule, and extracts according to the resource of Physical Downlink Control Channel the reference signal obtaining and calculate serving BS under described receiving system and the interference base station space channel vector to this reception antenna of receiving system, constructing module, for obtain the spatial channel matrix of Physical Downlink Control Channel to the space channel vector of all or part reception antenna of receiving system according to described serving BS and interference base station, and for according to the spatial channel matrix of described Physical Downlink Control Channel, the interference cancellation matrix of the Physical Downlink Control Channel of structure based on described predetermined pre-coding scheme, wherein, the interference cancellation matrix of described Physical Downlink Control Channel is according to described predetermined pre-coding scheme, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station are that feature is carried out modeling and obtained, cancellation module, for eliminating according to the interference cancellation matrix of described Physical Downlink Control Channel and predetermined detection criteria the data that described interference base station sends, and obtain described Downlink Control Information according to contrary processing of described predetermined modulation system and described convolution coding processing.

In accordance with a further aspect of the present invention, provide a kind of dispensing device of Physical Downlink Control Channel, for realizing the transmission of at least one antenna of Physical Downlink Control Channel.

This dispensing device comprises: coding module, for Downlink Control Information being carried out to convolution coding processing according to predetermined code rate; Modulation module, for modulating the data that obtain after encoding according to predetermined modulation system; Precoding module, for carrying out precoding processing according to predetermined pre-coding scheme to the data after modulating; Replicated blocks, for the data of the each transmitting antenna after precoding processing are carried out to reprocessing, wherein, the control channel particle length that the order of modulation of the number of times of reprocessing, described code rate and described modulation system is taken by Physical Downlink Control Channel and the length of described Downlink Control Information are determined; Mapping block, for for each transmitting antenna, the data-mapping that the control channel particle position taking according to predetermined Physical Downlink Control Channel obtains with reference to signal with after reprocessing is to the Physical Resource Block of this transmitting antenna; At least one transmitting antenna, for sending described data and the reference signal after mapping.

According to a further aspect in the invention, provide a kind of dispensing device of Physical Downlink Control Channel, for realizing the reception of at least one antenna of Physical Downlink Control Channel.

This receiving system comprises: at least one reception antenna, wherein, each reception antenna extracts for the resource of the data that receive separately and reference signal being carried out to Physical Downlink Control Channel according to blind check rule, and extracts according to the resource of Physical Downlink Control Channel the reference signal obtaining and calculate serving BS under described receiving system and the interference base station space channel vector to this reception antenna of receiving system, constructing module, for obtain the spatial channel matrix of Physical Downlink Control Channel to the space channel vector of all or part reception antenna of receiving system according to described serving BS and interference base station, and for according to the spatial channel matrix of described Physical Downlink Control Channel, the interference cancellation matrix of the Physical Downlink Control Channel of the predetermined pre-coding scheme that structure adopts based on dispensing device, wherein, the interference cancellation matrix of described Physical Downlink Control Channel is according to described predetermined pre-coding scheme, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station are that feature is carried out modeling and obtained, cancellation module, for eliminating according to the interference cancellation matrix of described Physical Downlink Control Channel and predetermined detection criteria the data that described interference base station sends, and contrary processing of the modulation system adopting according to dispensing device and convolution coding processing obtains Downlink Control Information.

The present invention by Downlink Control Information is encoded, modulation, precoding processing, reprocessing send and build the interference cancellation matrix based on pre-coding scheme recipient, can effectively eliminate the interference of other base stations to serving BS Physical Downlink Control Channel, make recipient can correctly detect and obtain Downlink Control Information, avoid cannot correctly detecting because interference causes Downlink Control Information.

Brief description of the drawings

Fig. 1 is according to the flow chart of the transmission method of the Physical Downlink Control Channel of the embodiment of the present invention;

Fig. 2 is the schematic diagram that is applied to transmit leg side after LTE system and processes example one according to the transmission method of the Physical Downlink Control Channel of the embodiment of the present invention;

Fig. 3 is the schematic diagram that is applied to transmit leg side after LTE system and processes example two according to the transmission method of the Physical Downlink Control Channel of the embodiment of the present invention;

Fig. 4 is the processing schematic diagram that is applied to recipient's side after LTE system according to the transmission method of the Physical Downlink Control Channel of the embodiment of the present invention;

Fig. 5 is the schematic diagram that carries out PDCCH signal, reference signal and data-mapping while being applied to LTE system according to the transmission method of the Physical Downlink Control Channel of the embodiment of the present invention;

Fig. 6 is the Packet Error Ratio contrast schematic diagram according to the transmission method of the Physical Downlink Control Channel of the embodiment of the present invention and traditional scheme in strong jamming situation;

Fig. 7 is the Packet Error Ratio contrast schematic diagram according to the transmission method of the Physical Downlink Control Channel of the embodiment of the present invention and traditional scheme in noiseless situation;

Fig. 8 is according to the block diagram of the transmission system of the Physical Downlink Control Channel of the embodiment of the present invention.

Embodiment

Thereby for causing recipient cannot demodulation Downlink Control Information to affect the problem of recipient's proper communication because Physical Downlink Control Channel is subject to strong presence of intercell interference in correlation technique, the present invention proposes, Downlink Control Information is encoded according to predetermined code rate by transmit leg, modulation, precoding processing, afterwards the data of the each transmitting antenna after precoding processing are carried out to reprocessing, wherein, the number of times of reprocessing, code rate, the control channel particle length being taken by Physical Downlink Control Channel with the order of modulation of modulation system and the length of Downlink Control Information are determined, afterwards, the data of transmit leg to reference signal and after repeating are shone upon rear transmission, built the interference cancellation matrix of the Physical Downlink Control Channel based on pre-coding scheme according to spatial channel matrix by recipient, and utilize interference cancellation matrix and detection criteria to eliminate the interference of other base stations, obtain the Downlink Control Information that serving BS sends.

Below in conjunction with accompanying drawing, describe embodiments of the invention in detail.

According to embodiments of the invention, a kind of transmission method of Physical Downlink Control Channel is provided, the method is for realizing the transmission of at least one antenna and the reception of at least one antenna of Physical Downlink Control Channel.

As shown in Figure 1, comprise according to the transmission method of the Physical Downlink Control Channel of the embodiment of the present invention:

Step S101, transmit leg carries out convolution coding processing according to predetermined code rate to Downlink Control Information;

Step S103, transmit leg is modulated the data that obtain after encoding according to predetermined modulation system;

Step S105, transmit leg carries out precoding processing according to predetermined pre-coding scheme to the data after modulating;

Step S107, the data of the each transmitting antenna of transmit leg after to precoding processing are carried out reprocessing, wherein, the control channel particle length that the order of modulation of the number of times of reprocessing, code rate and modulation system is taken by Physical Downlink Control Channel and the length of Downlink Control Information are determined;

Step S109, for each transmitting antenna, the data-mapping that the control channel particle position that transmit leg takies according to predetermined Physical Downlink Control Channel obtains with reference to signal with after reprocessing arrives the Physical Resource Block of this transmitting antenna, and sends data and reference signal after mapping;

Step S111, each reception antenna of recipient carries out the resource extraction of Physical Downlink Control Channel to the data that receive separately and reference signal according to blind check rule;

Step S113, each reception antenna extracts according to the resource of Physical Downlink Control Channel the reference signal obtaining and calculates serving BS under recipient and the interference base station space channel vector to this reception antenna of recipient, and obtains the spatial channel matrix of Physical Downlink Control Channel to the space channel vector of recipient's all or part reception antenna according to serving BS and interference base station;

Step S115, recipient is according to the spatial channel matrix of Physical Downlink Control Channel, the interference cancellation matrix of the Physical Downlink Control Channel of the pre-coding scheme of structure based on predetermined, wherein, the interference cancellation matrix of Physical Downlink Control Channel is that feature is carried out modeling and obtained according to predetermined pre-coding scheme, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station;

Step S117, recipient eliminates according to the interference cancellation matrix of Physical Downlink Control Channel and predetermined detection criteria the data that interference base station sends, and obtains Downlink Control Information according to contrary processing of predetermined modulation system and convolution coding processing.And, can further carry out CRC check for the Downlink Control Information obtaining, if the Downlink Control Information obtaining not by verification, needs to return step S111, again carry out resource extraction according to blind check criterion.

By above-mentioned processing, by Downlink Control Information is encoded, modulation, precoding processing, reprocessing send and build the interference cancellation matrix based on pre-coding scheme recipient, can effectively eliminate the interference of other base stations to serving BS Physical Downlink Control Channel, make recipient can correctly detect and obtain Downlink Control Information, avoid the problem that causes Downlink Control Information correctly to detect due to interference.

Particularly, in above-mentioned processing, in the time obtaining the spatial channel matrix of Physical Downlink Control Channel according to serving BS and interference base station to the space channel vector of recipient's all or part reception antenna, the resource of Physical Downlink Control Channel is extracted to the serving BS that obtains with each reception antenna and the reference signal of interference base station separates and estimates, obtain the physical channel of all transmitting antennas to this reception antenna of recipient, according to reprocessing mode, the physical channel of estimating is arranged, formed the space channel vector that this reception antenna is corresponding; Recipient arranges space channel vector corresponding to the reception antenna of all or part according to the sequence number of reception antenna, forms the spatial channel matrix of Physical Downlink Control Channel.

Alternatively, before the data-mapping obtaining with reference to signal with after reprocessing arrives the Physical Resource Block of this transmitting antenna, transmit leg can interweave to repeating data after treatment according to predetermined interleaving scheme, and data after interweaving are as data to be mapped;

And, the resource that each reception antenna carries out Physical Downlink Control Channel according to blind check rule to the data that receive separately and reference signal extracts and comprises: recipient carries out resource extraction to the data that receive, and the data that resource extracted according to predetermined interleaving scheme are carried out contrary interweaving;

And before the physical channel of according to reprocessing mode, each reception antenna being estimated recipient is arranged, the method further comprises: according to predetermined interleaving scheme, the physical channel of estimating is carried out to contrary interweaving.

In addition the space channel vector that, the spatial channel matrix of above-mentioned Physical Downlink Control Channel sends to all reception antennas or part reception antenna by all transmitting antennas of transmit leg forms.For example, suppose that the quantity of transmitting antenna and the quantity of reception antenna are 4, the each reception antenna in 4 reception antennas all can obtain the space channel vector from all 4 transmitting antennas, the spatial channel matrix forming can comprise all space channel vectors that all reception antennas obtain, also can comprise all space channel vectors that wherein part reception antenna obtains (for example, can only select 2 all space channel vector Special composition channel matrixes that reception antenna obtains in 4 reception antennas).

In addition, in the time of the interference cancellation matrix of the pre-coding scheme of structure based on predetermined, can be according to the number of the number of predetermined pre-coding scheme, transmit leg transmitting antenna, recipient's reception antenna, the data after precoding processing are carried out the number of times of reprocessing and the number of interference base station and determined the dimension of interference cancellation matrix; And, for the each channel element in spatial channel matrix, determine the first dimension sequence number (this sequence number can be row sequence number) of this channel element in interference cancellation matrix according to the sequence number of the sequence number of the sequence number of the reception antenna of this channel element, transmitting antenna, reprocessing and predetermined pre-coding scheme, and determine the second dimension sequence number (this sequence number can be row sequence number) of this channel element in interference cancellation matrix according to the sequence number of the base station sequence number of this channel element, transmitting antenna and predetermined pre-coding scheme.

In addition, above-mentioned the first dimension sequence number can be also the row sequence number of interference cancellation matrix, now, and the row sequence number that the second dimension sequence number is interference cancellation matrix.

Alternatively, the control channel particle length O that the order of modulation M of the times N of reprocessing, code rate R, modulation system, Physical Downlink Control Channel take and the length I of Downlink Control Information meet the following conditions:

that is to say,, can select according to this formula the value of N, R and M, thereby ensure that the shared control channel particle length of Physical Downlink Control Channel of mapping is consistent with the requirement of LTE communication system known in the situation that at O and I.In addition, exceeded system requirements if O is excessive, can intercept the data that obtain after reprocessing, shone upon again afterwards; If do not reach system requirements and O is too small, can supplement the data that obtain after reprocessing (for example, " 0 " being added in the data that obtain after repetition), shine upon again afterwards.

And, in order to ensure to disturb the effect of eliminating, can also, according to the number of interference base station, pre-determine the times N of the data after precoding processing being carried out to reprocessing, wherein, N >=B+1, the number that B is interference base station.

Eliminate the effect of presence of intercell interference in order effectively to ensure above-mentioned processing, in the time that the data-mapping obtaining with reference to signal and after reprocessing arrives the Physical Resource Block of this transmitting antenna, serving BS and interference base station should adopt the resource mapping scheme of identical Physical Downlink Control Channel, that is to say, serving BS is identical with the mapping position of the Downlink Control Information of interference base station.

Alternatively, before the data-mapping obtaining after reprocessing is arrived the Physical Resource Block of this transmitting antenna by transmit leg, transmit leg is according to the resource mapping scheme of predetermined Physical Downlink Control Channel, the resource location of the required mapping of reference signal to serving BS and interference base station is reserved, wherein, in mapping process, reserved resource location is only for mapping reference signal, and, in the time reserving, can only reserve for the mapping area of Physical Downlink Control Channel in Physical Resource Block, also can in whole Physical Resource Block, all reserve.By carrying out the processing of resource reservation, can further improve the effect of channel estimating, and then contribute to improve the effect of disturbing elimination.

In addition, the number of transmit antennas adopting when the scheme of precoding can send according to transmit leg is determined.Particularly, in the situation that transmit leg utilizes single transmitting antenna to carry out Physical Downlink Control Channel transmission, predetermined pre-coding scheme is single antenna delivery plan; In the situation that transmit leg utilizes multiple transmitting antennas to carry out Physical Downlink Control Channel transmission, predetermined pre-coding scheme is transmission diversity delivery plan.

In step S117, it is one of following that the predetermined detection criterion adopting includes but not limited to: maximum likelihood, least mean-square error, least square method.Those skilled in the art can select above-mentioned detection criteria or other more detection criteria according to actual application scenarios, concrete How to choose detection criteria and how to detect according to different detection criteria be known in those skilled in the art, will not enumerate herein.

Below will be taking LTE system as example, detailed description the present invention reduces or eliminates the process of interference in LTE system.Those skilled in the art are to be understood that, application process described below is only for setting forth the solution of the present invention, and be not used in restriction the present invention, for other wireless communication systems (for example, LTE-Advanced system etc.), and in other system for transmitting the control channel of Downlink Control Information, all can adopt the solution of the present invention reach reduce or eliminate disturb object, thereby make terminal can correctly detect and obtain Downlink Control Information.

Fig. 2 and Fig. 3 show the processing procedure at transmitting terminal according to the transmission method of the Physical Downlink Control Channel of the embodiment of the present invention.

As shown in Figure 2, in the situation that transmitting terminal adopts single antenna to carry out Downlink Control Information transmission, the processing procedure of transmitting terminal is as follows:

Suppose that from the length of the Downlink Control Information of PDCCH information source be a bit, if under the strong interference environment of current PDCCH in cell edge, in order to improve interference free performance, effective code speed that can PDCCH convolution code is set to low code check R, and Downlink Control Information is carried out to convolutional encoding.The PDCCH predetermining for not change system is mapped to the data length of CCE, in the present embodiment, the convolution code effective code speed of PDCCH can be adjusted into 3R, and the data length after coding is b bit (b=a/3R); Afterwards, b bit signal is carried out after scrambling and QPSK modulation, the length of gained signal is b/2; Afterwards, the data after modulation are carried out to the precoding of single antenna transmissions scheme.

Now, Ke Yishe

be single antenna transmissions, organize the data after multiplexing more, i is data sequence number and i=1,2 ..., b/2, k is base station sequence number and k=1: K; Will

repeat after 3 times, the signal after reprocessing can be expressed as

the resource size of distributing to every group of PDCCH channel in supposing the system is 3b/2, and according to the adjustment of coding and number of repetition, this scheme has ensured that the length of mapping signal keeps 3b/2 constant.The data of repetition can be obtained after interleaver,

wherein represent the interleaver for repeating data piece j of base station k, j=1: 3.

As shown in Figure 3, in the situation that adopting two transmitting antennas to send, need to carry out equally above-mentioned convolution coding, scrambling and QPSK modulation treatment, its process, with the processing under single antenna delivery plan, no longer repeats here.

In the situation that 2 antennas send, can adopt the mode of transmission diversity to carry out signal transmission, now need to adopt the precoding for many antenna scheme.Particularly, establish

be the data after transmission diversity precoding, i is data sequence number and i=1,2 ..., b/2, k is base station sequence number and k=1: K, [S ₁s ₂] be the signal of antenna 1 in subcarrier f and subcarrier f+1 transmitting,

the signal of antenna 2 in subcarrier f and subcarrier f+1 transmitting.Will

after repeating respectively 3 times, data on each antenna can be expressed as

the data of repetition can be obtained after interleaver:

wherein,

represent the interleaver for repeating data piece j of base station k, j=1: 3,

can represent the transmitting data of antenna 1 and antenna 2.

In the processing procedure shown in Fig. 2 and Fig. 3, by the selection to code rate and number of repetition, can make the length of the PDCCH mapping (enum) data after repetition meet the requirement of LTE system, afterwards can be by

according to predetermined mapping ruler, above-mentioned Downlink Control Information after treatment is mapped on the CCE of different antennae port.

In the scheme shown in Fig. 2 and Fig. 3, the PDCCH of different districts occupies same position in the time that time-frequency domain resources is shone upon, and therefore, the PDCCH of multiple communities is distributed in unified frequency domain resource and makes this scheme can realize many area interference eliminations.After PDCCH is mapped on CCE, after IFFT is modulated to time domain, (that is, completes ofdm signal and generate), can send by radio frequency at antenna port.

Fig. 4 is the processing procedure at receiving terminal according to the transmission method of the Physical Downlink Control Channel of the embodiment of the present invention.

As shown in Figure 4, the processing procedure of receiving terminal is as follows:

Recipient, the signal of reception can be expressed as

wherein,

be l the reception signal on reception antenna, according to the CFI information in PCFICH and the blind check criterion to PDCCH, extract the data message (that is, completed PDCCH resource and extracted) of the CCE of current detection, carry out, after contrary interweaving, can obtaining:

$Z_i^l={\left[\begin{array}{cc}{Y}_i^l{Y}_{i+b/2}^l& Y_{i+b}^l\end{array}\right]}^T,i=1:3,$

Wherein,

reception signal corresponding to data of sequence number i in the repeating data piece of receiving on l reception antenna of receiving terminal.Can estimate the channel from different districts by reference to signal (Reference signals, RS), wherein, comprise the space channel vector from serving BS under recipient and interference base station:

wherein,

represent to receive on reception antenna l, from channel estimating corresponding to data that in j the repeating data piece of base station k, sequence number is i,

represent the upper Gaussian noise of reception antenna l, now, completed serving BS is extracted with the RS that closes on (interference) base station, and obtained the channel estimating of serving BS and adjacent base station.

Particularly, send if transmitting terminal is single antenna pattern, can be by receiving signal indication:

wherein,

represent channel estimating corresponding to data that receive, that be i from base station k, a j repeating data piece, sequence number on antenna l, the interference cancellation matrix of structure can be expressed as:

Wherein,

be illustrated in the interference cancellation matrix that l reception antenna estimated.For single reception antenna, the line number of matrix is consistent with the number of repetition of data block, and the number of matrix column number and base station is consistent.Suppose be known noise variance matrix, can utilize least mean-square error (Minimum Mean SquareError, referred to as MMSE) criterion estimation criterion to obtain estimating

wherein,

for multiple reception antennas, can expand the row of interference cancellation matrix:

For example, if the sending mode that transmitting terminal has adopted multi-antenna transmitting transmission diversity (, the send mode of 2 transmitting antennas shown in Fig. 3), taking 2 transmitting antennas as example, in conjunction with the many area interference cancellation scheme in transmission diversity and PDCCH channel, receiving signal model can be reconstructed into:

$\left[\begin{array}{c}{Y}_{1\_1}^l\\ {\left(Y_{2\_1}^l\right)}^{*}\\ Y_{1\_2}^l\\ {\left(Y_{2\_2}^l\right)}^{*}\\ Y_{1\_3}^l\\ {\left(Y_{2\_3}^l\right)}^{*}\end{array}\right]=\left[\begin{array}{cccccccccc}{H}_{11\_1}^{l1}& -H_{21\_1}^{l1}& H_{11\_1}^{l2}& H_{21\_1}^{l2}& 0& 0& H_{11\_1}^{l3}& H_{21\_1}^{l3}& 0& 0\\ {\left(H_{21\_1}^{l1}\right)}^{*}& {\left(H_{11\_1}^{l1}\right)}^{*}& 0& 0& {\left(H_{12\_1}^{l2}\right)}^{*}& {\left(H_{22\_1}^{l2}\right)}^{*}& 0& 0& {\left(H_{12\_1}^{l3}\right)}^{*}& {\left(H_{22\_1}^{l3}\right)}^{*}\\ H_{11\_2}^{l1}& -H_{21\_2}^{l1}& H_{11\_2}^{l2}& H_{21\_2}^{l2}& 0& 0& H_{11\_2}^{l3}& H_{21\_2}^{l3}& 0& 0\\ {\left(H_{21\_2}^{l1}\right)}^{*}& {\left(H_{11\_2}^{l1}\right)}^{*}& 0& 0& {\left(H_{12\_2}^{l2}\right)}^{*}& {\left(H_{22\_2}^{l2}\right)}^{*}& 0& 0& {\left(H_{12\_2}^{l3}\right)}^{*}& {\left(H_{22\_2}^{l3}\right)}^{*}\\ H_{11\_3}^{l1}& -H_{21\_3}^{l1}& H_{11\_3}^{l2}& H_{21\_3}^{l2}& 0& 0& H_{11\_3}^{l3}& H_{21\_3}^{l3}& 0& 0\\ {\left(H_{21\_3}^{l1}\right)}^{*}& {\left(H_{11\_3}^{l1}\right)}^{*}& 0& 0& {\left(H_{12\_3}^{l2}\right)}^{*}& {\left(H_{22\_3}^{l2}\right)}^{*}& 0& 0& {\left(H_{12\_3}^{l3}\right)}^{*}& {\left(H_{22\_3}^{l3}\right)}^{*}\end{array}\right]\left[\begin{array}{c}{S}_1^{l1}\\ {\left(S_2^{l1}\right)}^{*}\\ S_{11}^{l2}\\ S_{21}^{l2}\\ {\left(S_{12}^{l2}\right)}^{*}\\ {\left(S_{22}^{l2}\right)}^{*}\\ S_{11}^{l3}\\ S_{21}^{l3}\\ {\left(S_{12}^{l3}\right)}^{*}\\ {\left(S_{22}^{l3}\right)}^{*}\end{array}\right]+\left[\begin{array}{c}{N}_{1\_1}^l\\ N_{2\_1}^l\\ N_{1\_2}^l\\ N_{2\_2}^l\\ N_{1\_3}^l\\ N_{2\_3}^l\end{array}\right],$

Wherein,

the data of sequence number i in the repeating data piece j that expression antenna l receives;

represent channel estimating corresponding to data from base station k, transmitting antenna n, repeating data piece j, sequence number i that antenna l receives.

refer to receive on antenna l, from signal base station k, sequence number i;

gaussian noise corresponding to data of sequence number i in the repeating data piece j that expression antenna l receives.Corresponding interference cancellation matrix can be expressed as:

${\widehat{\mathrm{\Ω}}}_i^{\mathrm{lK}}=\left[\begin{array}{cccccccccc}{H}_{11\_1}^{l1}& -H_{21\_1}^{l1}& H_{11\_1}^{l2}& H_{21\_1}^{l2}& 0& 0& H_{11\_1}^{l3}& H_{21\_1}^{l3}& 0& 0\\ {\left(H_{21\_1}^{l1}\right)}^{*}& {\left(H_{11\_1}^{l1}\right)}^{*}& 0& 0& {\left(H_{12\_1}^{l2}\right)}^{*}& {\left(H_{22\_1}^{l2}\right)}^{*}& 0& 0& {\left(H_{12\_1}^{l3}\right)}^{*}& {\left(H_{22\_1}^{l3}\right)}^{*}\\ H_{11\_2}^{l1}& -H_{21\_2}^{l1}& H_{11\_2}^{l2}& H_{21\_2}^{l2}& 0& 0& H_{11\_2}^{l3}& H_{21\_2}^{l3}& 0& 0\\ {\left(H_{21\_2}^{l1}\right)}^{*}& {\left(H_{11\_2}^{l1}\right)}^{*}& 0& 0& {\left(H_{12\_2}^{l2}\right)}^{*}& {\left(H_{22\_2}^{l2}\right)}^{*}& 0& 0& {\left(H_{12\_2}^{l3}\right)}^{*}& {\left(H_{22\_2}^{l3}\right)}^{*}\\ H_{11\_3}^{l1}& -H_{21\_3}^{l1}& H_{11\_3}^{l2}& H_{21\_3}^{l2}& 0& 0& H_{11\_3}^{l3}& H_{21\_3}^{l3}& 0& 0\\ {\left(H_{21\_3}^{l1}\right)}^{*}& {\left(H_{11\_3}^{l1}\right)}^{*}& 0& 0& {\left(H_{12\_3}^{l2}\right)}^{*}& {\left(H_{22\_3}^{l2}\right)}^{*}& 0& 0& {\left(H_{12\_3}^{l3}\right)}^{*}& {\left(H_{22\_3}^{l3}\right)}^{*}\end{array}\right]\begin{array}{}\end{array};$

Particularly, building interference cancellation matrix time, can be according to the number of the number of predetermined pre-coding scheme, transmit leg transmitting antenna, recipient's reception antenna, the data after precoding processing are carried out the number of times of reprocessing and the number of interference base station and determined the dimension of interference cancellation matrix; And, for the each channel element in spatial channel matrix, determine the row sequence number of this channel element in interference cancellation matrix according to the sequence number of the sequence number of the sequence number of the reception antenna of this channel element, transmitting antenna, reprocessing and predetermined pre-coding scheme, and determine the row number of this channel element in interference cancellation matrix according to the sequence number of the base station sequence number of this channel element, transmitting antenna and predetermined pre-coding scheme.

It should be noted that given interference cancellation matrix here

be only a concrete example, the structure of above-mentioned interference cancellation matrix is changed, also utilizes the interference cancellation matrix after changing to carry out after subsequent treatment, can reach equally and reduce the object that cell edge disturbs; In addition, can also be under the prerequisite of calculation requirement that meets the transmission data of eliminating interference base station, local channel element in above-mentioned interference cancellation matrix is carried out to position change or place-exchange, and correspondingly, the expression that receives other parts in signal model also can be made corresponding change; In addition, for the situation of 4 antenna sending and receivings and other quantity antennas, can adjust accordingly equally and variation obtains interference cancellation matrix, concrete mapping mode will not enumerate herein.

If recipient has multiple reception antennas, the line number maximum of matrix can take advantage of the number of reception antenna consistent with the number of repetition of data block.Afterwards, can disturb elimination by detection criteria, now, suppose to carry out equilibrium treatment using MMSE as detection criteria, suppose

be known noise variance matrix, can utilize MMSE estimation criterion to obtain estimating

wherein, for multiple reception antennas, can expand the row of interference cancellation matrix:

For receiving terminal, if N >=K can be met, interference cancellation matrix is full rank (Full Rank) matrix, and N is the number of repetition of data block.The full rank of interference cancellation matrix has ensured estimation that can be correct according to different criterions

Desired signal

through separating layer mapping, QPSK demodulation, descrambling, convolution code decoding (decoding) (, the contrary processing that scrambling that transmit leg carries out, convolution coding processing, modulation treatment etc. are processed) after, by the CRC check of mating with UE, blind check result is verified.If by CRC check, that is, blind check result meets the requirements, represent correctly to have received DCI information, reception & disposal completes; If not by verification, re-start resource according to blind check rule and extract, and extract result and complete the subsequent treatment such as structure, MMSE equilibrium, signal demodulation, signal descrambling and decoding of interference cancellation matrix according to new resource.

Below by reference signal mapping position, reserved processing is described.

Eliminate for the interference that better realizes LTE PDCCH, terminal needs to estimate more accurately the channel response from multiple communities.In order to reach the reliability of channel estimating of many communities, can carry out mapping position to reference signal (Reference signals, RS) reserved.Fig. 5 is the schematic diagram of PDCCH signal in LTE descending time slot, reference signal, business datum signal map, is the distribution that PDCCH signal, reference signal and the business datum of 3 base stations in Fig. 5.Wherein, PDCCH signal, the reference signal of base station 1, base station 2 and base station 3 are orthogonal at frequency domain, do not interfere with each other mutually.But in cell edge region; if used identical frequency spectrum resource in the user of different districts; just there is serious phase mutual interference in downlink data signal; user can receive the signal at same frequency spectrum resource from different base station; now; signal interference ratio (SIR) conventionally can be lower than 0dB; correspondingly; PDCCH signal can be subject to the interference of other control channels of other base stations equally; reference signal can be subject to the interference from the data-signal of different base station, thereby seriously reduces the reliability of channel estimating.Disturb in order to improve the effect of eliminating, make the correctly demodulation of signal from different base station, the transmitting terminal of adjacent base station all needs (for example to use above-mentioned delivery plan, delivery plan shown in Fig. 2 and Fig. 3, detailed process can be with reference to the step S101 of Fig. 1 to step S109), and will reserve the position of the required mapping of reference signal of these known interference base stations, guarantee user can isolate the reference signal of different base station and carry out channel estimating.Therefore, will no longer shine upon business datum signal in the position of the reference signal shown in Fig. 5, thereby improve the effect of channel estimating, and then improve and disturb the effect of eliminating.

Fig. 6 adopts the schematic diagram with the Packet Error Ratio comparison of employing traditional PD CCH transmission plan according to the transmission plan of the PDCCH of the present embodiment under cell edge strong interference environment.In Fig. 6, abscissa is that signal to noise ratio (SNR) is the ratio of signal and Gaussian noise, and ordinate is Packet Error Ratio (BLER).Signal interference ratio represents the power ratio of this base station and adjacent two interference base stations, SIR=[0dB 0dB] represent that the power ratio of this base station and adjacent two interference base stations is 0dB, that is, the power of three base stations is identical, represents to exist under current environment very strong interference.This emulation based on condition be: LTE normal cyclic prefix, FDD duplex, ideal communication channel are estimated.Can find out by the simulation result shown in Fig. 6, in the strongly disturbing situation of cell edge, if adopt traditional PDCCH transmission plan, no matter be single antenna pattern or multi-antenna transmission diversity mode, as long as PDCCH is subject to the interference from other other control channels of base station, Packet Error Ratio maintains more than 30% all the time, and, even raising signal to noise ratio, the trend that Packet Error Ratio curve does not still reduce, therefore,, if adopt traditional PDCCH transmission plan, the erroneous judgement meeting of high probability brings a lot of expenses and delay to system; And if the PDCCH transmission plan that adopts the present embodiment to propose, under single antenna pattern and multi-antenna transmission diversity mode, Packet Error Ratio all can drop to below 1%, can clearly eliminate the interference from other base stations, reduces overhead and delay.

Fig. 7 adopts the schematic diagram with the Packet Error Ratio comparison of employing traditional PD CCH transmission plan according to the transmission plan of the PDCCH of the present embodiment under noiseless environment.As shown in Figure 7, in glitch-free situation, if the PDCCH transmission plan that adopts the present embodiment to provide, under single antenna pattern and multi-antenna transmission diversity mode, Packet Error Ratio also approaches the Packet Error Ratio while adopting traditional PD CCH transmission plan this programme, that is, adopt according to after the PDCCH scheme of the present embodiment, can effectively ensure that the performance of center of housing estate is unaffected.

It should be noted that, although be described as an example of LTE system example before, but the present invention is not limited to this, for other communication systems (for example, LTE-A system etc.) the middle channel that transmits Downlink Control Information, can adopt equally the above-mentioned processing of the present embodiment to reach the object of disturbing elimination.

By means of above-mentioned processing, by Downlink Control Information is encoded, modulation, precoding processing, reprocessing also sends, and build the interference cancellation matrix based on pre-coding scheme recipient, center of housing estate performance can not affected, and change as few as possible under the prerequisite of original system, effectively eliminate the interference of other base stations to serving BS Physical Downlink Control Channel, make recipient can correctly detect and obtain Downlink Control Information, avoid the problem that causes Downlink Control Information correctly to detect due to interference, and then avoid retransmitting in system data delay and the overhead that Downlink Control Information produces, make recipient at signal interference ratio lower than 0dB in the situation that, still can be correctly decoded PDCCH.

According to embodiments of the invention, a kind of transmission system of Physical Downlink Control Channel is provided, this system can be used for the transmission of at least one antenna of realizing Physical Downlink Control Channel and the reception of at least one antenna.

As shown in Figure 8, comprise dispensing device 81 and receiving system 82 according to the transmission system of the Physical Downlink Control Channel of the present embodiment.

Particularly, dispensing device 81 comprises: coding module 811, for Downlink Control Information being carried out to convolution coding processing according to predetermined code rate; Modulation module 812, for modulating the data that obtain after encoding according to predetermined modulation system; Precoding module 813, for carrying out precoding processing according to predetermined pre-coding scheme to the data after modulating; Replicated blocks 814, for the data of the each transmitting antenna after precoding processing are carried out to reprocessing, wherein, the control channel particle length that the order of modulation of the number of times of reprocessing, code rate and modulation system is taken by Physical Downlink Control Channel and the length of Downlink Control Information are determined; Mapping block 815, for for each transmitting antenna, the data-mapping that the control channel particle position taking according to predetermined Physical Downlink Control Channel obtains with reference to signal with after reprocessing is to the Physical Resource Block of this transmitting antenna; At least one transmitting antenna 816, for sending data and the reference signal after mapping;

Receiving system 82 comprises: at least one reception antenna 821, wherein, each reception antenna extracts for the resource of the data that receive separately and reference signal being carried out to Physical Downlink Control Channel according to blind check rule, and extracts according to the resource of Physical Downlink Control Channel the reference signal obtaining and calculate serving BS under receiving system and the interference base station space channel vector to this reception antenna of receiving system; Constructing module 822, for obtain the spatial channel matrix of Physical Downlink Control Channel to the space channel vector of all or part reception antenna of receiving system according to serving BS and interference base station, and for according to the spatial channel matrix of Physical Downlink Control Channel, the interference cancellation matrix of the Physical Downlink Control Channel of the pre-coding scheme of structure based on predetermined, wherein, the interference cancellation matrix of Physical Downlink Control Channel is that feature is carried out modeling and obtained according to predetermined pre-coding scheme, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station; Cancellation module 823, for eliminating according to the interference cancellation matrix of Physical Downlink Control Channel and predetermined detection criteria the data that interference base station sends, and obtains Downlink Control Information according to contrary processing of predetermined modulation system and convolution coding processing.

By above-mentioned processing, by Downlink Control Information is encoded, modulation, precoding processing, reprocessing send and build the interference cancellation matrix based on pre-coding scheme recipient, can effectively eliminate the interference of other base stations to serving BS Physical Downlink Control Channel, make recipient can correctly detect and obtain Downlink Control Information, avoid cannot correctly detecting because interference causes Downlink Control Information the problem that needs transmit leg to re-start transmission.

In addition, disturb the process of eliminating being described before for the structure of interference cancellation matrix and based on interference cancellation matrix and detection criteria, no longer repeat here.

Similarly, thus said system can further introduce equally other processing modules and have data are interweaved and the several functions such as deinterleaving, reference signal position be reserved; And this system can be applied to the various wireless communication system such as LTE system equally, and reach the similar interference eradicating efficacy of describing with embodiment of the method part.

In sum, by means of technique scheme of the present invention, by Downlink Control Information is encoded, modulation, precoding processing, reprocessing also sends, and build the interference cancellation matrix based on pre-coding scheme recipient, center of housing estate performance can not affected, and change as few as possible under the prerequisite of original system, effectively eliminate the interference of other base stations to serving BS Physical Downlink Control Channel, make recipient can correctly detect and obtain Downlink Control Information, avoid the problem that causes Downlink Control Information correctly to detect due to interference, and then avoid retransmitting in system data delay and the overhead that Downlink Control Information produces, make recipient at signal interference ratio lower than 0dB in the situation that, still can be correctly decoded PDCCH.

The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (13)

1. a transmission method for Physical Downlink Control Channel, for realizing the transmission of at least one antenna and the reception of at least one antenna of Physical Downlink Control Channel, is characterized in that, described method comprises:

Transmit leg carries out convolution coding processing according to predetermined code rate to Downlink Control Information;

Described transmit leg is modulated the data that obtain after encoding according to predetermined modulation system;

Described transmit leg carries out precoding processing according to predetermined pre-coding scheme to the data after modulating;

The data of the each transmitting antenna of described transmit leg after to precoding processing are carried out reprocessing, wherein, the control channel particle length that the order of modulation of the number of times of reprocessing, described code rate and described modulation system is taken by Physical Downlink Control Channel and the length of described Downlink Control Information are determined;

For each transmitting antenna, the data-mapping that the control channel particle position that described transmit leg takies according to predetermined Physical Downlink Control Channel obtains with reference to signal with after reprocessing arrives the Physical Resource Block of this transmitting antenna, and sends described data and reference signal after mapping;

Each reception antenna of recipient carries out the resource extraction of Physical Downlink Control Channel to the data that receive separately and reference signal according to blind check rule;

Described each reception antenna extracts according to the resource of Physical Downlink Control Channel the reference signal obtaining and calculates serving BS under described recipient and the interference base station space channel vector to this reception antenna of recipient, and obtains the spatial channel matrix of Physical Downlink Control Channel to the space channel vector of recipient's all or part reception antenna according to described serving BS and interference base station;

Described recipient is according to the spatial channel matrix of described Physical Downlink Control Channel, the interference cancellation matrix of the Physical Downlink Control Channel of structure based on described predetermined pre-coding scheme, wherein, the interference cancellation matrix of described Physical Downlink Control Channel is that feature is carried out modeling and obtained according to described predetermined pre-coding scheme, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station;

Described recipient eliminates according to the interference cancellation matrix of described Physical Downlink Control Channel and predetermined detection criteria the data that described interference base station sends, and obtains described Downlink Control Information according to contrary processing of described predetermined modulation system and described convolution coding processing.

2. method according to claim 1, is characterized in that, the spatial channel matrix that obtains Physical Downlink Control Channel to the space channel vector of recipient's all or part reception antenna according to described serving BS and interference base station comprises:

The resource of Physical Downlink Control Channel is extracted to the serving BS that obtains with described each reception antenna and the reference signal of interference base station separates and estimates, obtain the physical channel of all transmitting antennas to this reception antenna of recipient, according to reprocessing mode, the physical channel of estimating is arranged, formed the space channel vector of the Physical Downlink Control Channel that this reception antenna is corresponding;

Described recipient arranges space channel vector corresponding to the reception antenna of all or part according to the sequence number of reception antenna, forms the spatial channel matrix of described Physical Downlink Control Channel.

3. method according to claim 2, is characterized in that, before the data-mapping obtaining with reference to signal with after reprocessing arrives the Physical Resource Block of this transmitting antenna, described method also comprises:

Interweave to repeating data after treatment according to predetermined interleaving scheme, and data after interweaving are as data to be mapped;

And, the resource that described each reception antenna carries out Physical Downlink Control Channel according to described blind check rule to the data that receive separately and reference signal extracts and comprises: described recipient carries out resource extraction to the data that receive, and the data that described resource extracted according to described predetermined interleaving scheme are carried out contrary interweaving;

And before the physical channel of according to reprocessing mode, each reception antenna being estimated described recipient is arranged, the method further comprises: according to described predetermined interleaving scheme, the physical channel of estimating is carried out to contrary interweaving.

4. method according to claim 1, is characterized in that, the interference cancellation matrix of the Physical Downlink Control Channel of structure based on described predetermined pre-coding scheme comprises:

According to the number of the number of described predetermined pre-coding scheme, described transmit leg transmitting antenna, described recipient's reception antenna, the data after precoding processing are carried out the number of times of reprocessing and the number of described interference base station and are determined the dimension of described interference cancellation matrix; And

For the each channel element in described spatial channel matrix, determine the first dimension sequence number of this channel element in described interference cancellation matrix according to the sequence number of the sequence number of the sequence number of the reception antenna of this channel element, transmitting antenna, reprocessing and described predetermined pre-coding scheme, and determine the second dimension sequence number of this channel element in described interference cancellation matrix according to the sequence number of the base station sequence number of this channel element, transmitting antenna and described predetermined pre-coding scheme.

5. method according to claim 1, it is characterized in that, the order of modulation M of the times N of reprocessing, described code rate R, described modulation system, the control channel particle length O that Physical Downlink Control Channel takies and the length I of described Downlink Control Information meet the following conditions:

$O=\frac{I\·N}{R\·M}.$

6. method according to claim 5, is characterized in that, also comprises:

According to the number of described interference base station, pre-determine the times N of the data after described precoding processing being carried out to reprocessing, wherein, N >=B+1, the number that B is interference base station.

7. method according to claim 1, it is characterized in that, at the data-mapping obtaining with reference to signal and after reprocessing during to the Physical Resource Block of this transmitting antenna, serving BS and interference base station adopt the resource mapping scheme of identical Physical Downlink Control Channel.

8. method according to claim 1, is characterized in that, before the data-mapping obtaining after reprocessing is arrived the Physical Resource Block of this transmitting antenna by described transmit leg, described method also comprises:

Described transmit leg is according to the resource mapping scheme of described predetermined Physical Downlink Control Channel, the resource location of the required mapping of reference signal to described serving BS and interference base station is reserved, wherein, in mapping process, reserved resource location is only for mapping reference signal.

9. according to the method described in any one in claim 1 to 8, it is characterized in that, in the situation that described transmit leg utilizes single transmitting antenna to carry out Physical Downlink Control Channel transmission, described predetermined pre-coding scheme is single antenna delivery plan; In the situation that described transmit leg utilizes multiple transmitting antennas to carry out Physical Downlink Control Channel transmission, described predetermined pre-coding scheme is transmission diversity delivery plan.

10. according to the method described in any one in claim 1 to 8, it is characterized in that, it is one of following that described predetermined detection criterion comprises: maximum likelihood, least mean-square error, least square method.

The transmission system of 11. 1 kinds of Physical Downlink Control Channel, for realizing the transmission of at least one antenna and the reception of at least one antenna of Physical Downlink Control Channel, is characterized in that, described system comprises dispensing device and receiving system, wherein,

Described dispensing device comprises:

Coding module, for carrying out convolution coding processing according to predetermined code rate to Downlink Control Information;

Modulation module, for modulating the data that obtain after encoding according to predetermined modulation system;

Precoding module, for carrying out precoding processing according to predetermined pre-coding scheme to the data after modulating;

Replicated blocks, for the data of the each transmitting antenna after precoding processing are carried out to reprocessing, wherein, the control channel particle length that the order of modulation of the number of times of reprocessing, described code rate and described modulation system is taken by Physical Downlink Control Channel and the length of described Downlink Control Information are determined;

Mapping block, for for each transmitting antenna, the data-mapping that the control channel particle position taking according to predetermined Physical Downlink Control Channel obtains with reference to signal with after reprocessing is to the Physical Resource Block of this transmitting antenna;

At least one transmitting antenna, for sending described data and the reference signal after mapping;

Described receiving system comprises:

At least one reception antenna, wherein, each reception antenna extracts for the resource of the data that receive separately and reference signal being carried out to Physical Downlink Control Channel according to blind check rule, and extracts according to the resource of Physical Downlink Control Channel the reference signal obtaining and calculate serving BS under described receiving system and the interference base station space channel vector to this reception antenna of receiving system;

Constructing module, for obtain the spatial channel matrix of Physical Downlink Control Channel to the space channel vector of all or part reception antenna of receiving system according to described serving BS and interference base station, and for according to the spatial channel matrix of described Physical Downlink Control Channel, the interference cancellation matrix of the Physical Downlink Control Channel of structure based on described predetermined pre-coding scheme, wherein, the interference cancellation matrix of described Physical Downlink Control Channel is according to described predetermined pre-coding scheme, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station are that feature is carried out modeling and obtained,

Cancellation module, for eliminating according to the interference cancellation matrix of described Physical Downlink Control Channel and predetermined detection criteria the data that described interference base station sends, and obtain described Downlink Control Information according to contrary processing of described predetermined modulation system and described convolution coding processing.

The dispensing device of 12. 1 kinds of Physical Downlink Control Channel, for realizing the transmission of at least one antenna of Physical Downlink Control Channel, is characterized in that, described dispensing device comprises:

Coding module, for carrying out convolution coding processing according to predetermined code rate to Downlink Control Information;

Modulation module, for modulating the data that obtain after encoding according to predetermined modulation system;

Precoding module, for carrying out precoding processing according to predetermined pre-coding scheme to the data after modulating;

Replicated blocks, for the data of the each transmitting antenna after precoding processing are carried out to reprocessing, wherein, the control channel particle length that the order of modulation of the number of times of reprocessing, described code rate and described modulation system is taken by Physical Downlink Control Channel and the length of described Downlink Control Information are determined;

Mapping block, for for each transmitting antenna, the data-mapping that the control channel particle position taking according to predetermined Physical Downlink Control Channel obtains with reference to signal with after reprocessing is to the Physical Resource Block of this transmitting antenna;

At least one transmitting antenna, for sending described data and the reference signal after mapping.

The receiving system of 13. 1 kinds of Physical Downlink Control Channel, for realizing the reception of at least one antenna of Physical Downlink Control Channel, is characterized in that, described receiving system comprises:

At least one reception antenna, wherein, each reception antenna extracts for the resource of the data that receive separately and reference signal being carried out to Physical Downlink Control Channel according to blind check rule, and extracts according to the resource of Physical Downlink Control Channel the reference signal obtaining and calculate serving BS under described receiving system and the interference base station space channel vector to this reception antenna of receiving system;

Constructing module, for obtain the spatial channel matrix of Physical Downlink Control Channel to the space channel vector of all or part reception antenna of receiving system according to described serving BS and interference base station, and for according to the spatial channel matrix of described Physical Downlink Control Channel, the interference cancellation matrix of the Physical Downlink Control Channel of the predetermined pre-coding scheme that structure adopts based on dispensing device, wherein, the interference cancellation matrix of described Physical Downlink Control Channel is according to described predetermined pre-coding scheme, transmitting antenna, reception antenna, reprocessing, serving BS and interference base station are that feature is carried out modeling and obtained,

Cancellation module, for eliminating according to the interference cancellation matrix of described Physical Downlink Control Channel and predetermined detection criteria the data that described interference base station sends, and contrary processing of the modulation system adopting according to dispensing device and convolution coding processing obtains Downlink Control Information.

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