CN101834642B - MIMO (Multiple Input Multiple Output) transmission method, base station device and communication system - Google Patents
MIMO (Multiple Input Multiple Output) transmission method, base station device and communication system Download PDFInfo
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Abstract
The invention discloses a multi-user MIMO (Multiple Input Multiple Output) transmission method, a base station device and a communication system. Aiming at a multi-user MIMO system adopting a precoding URS (Uniform Reporting System) as a demodulation reference signaling, the invention respectively provides a method for obtaining demodulation RD mapping modes from a plurality of user devices according to a plurality of URS multiplexing modes. The scheme is simple and effective and ensures that the multi-user MIMO system normally and efficiently works.
Description
Technical field
The present invention relates to mobile communication technology field, particularly relate to the reference signaling (URS) of a kind of employing based on user and carry out for multiple users method, base station equipment and the communication system that multiple-input and multiple-output (MIMO) transmits.
Background technology
Multiple-input, multiple-output (MIMO) technology has become one of key technology of Next-Generation Wireless Communication Systems.At present, had much about point-to-point Single User MIMO systematic research.In actual applications, system often needs a base station simultaneously and multiple subscriber equipment communicates, such as modal cellular system and WLAN (wireless local area network) etc.Therefore, also just arise at the historic moment about multiuser MIMO (Multi-user MIMO) systematic research of point-to-multipoint, it is more complicated than Single User MIMO.
Because the channel of each user in multi-user MIMO system is independent of one another, therefore, user generally can know the channel condition information of oneself, is but difficult to obtain other users' channel information, pays very large cost and obtain other subscriber channel informational needs.That is to say between user and be difficult to cooperate.In contrast, have ready conditions and obtain the channel condition information of all communication users in base station, and for tdd systems, the reference signaling of this up link that can be received by base station obtains, and needs to obtain by feedback for frequency division duplex system.In addition, the disposal ability of base station is also much better than than subscriber equipment, therefore be all generally before transmitting, to be done Signal Pretreatment (such as beam forming) by base station, disturb or after receiving signal, carry out reprocessing and distinguish user to eliminate, to suppress.Multiuser MIMO technology has been successfully used among the standard of LTE, can predict in LTE-Advanced system, and it will be also unusual one of important technology.
3GPP is at its up-to-date standardization document 3GPP TR36.913 (3GPP TSG RANrequirements for further advancements for E-UTRA, V8.0.0,2008-06), define LTE-Advanced system and need to support maximum 8 × 8 antenna configuration, the base station equipment that is to say LTE-Advanced system has configured 8 antennas, can support at most the transmission of 8 layer data streams simultaneously.And in LTE system, base station maximum can be supported 4 × 4 antenna configuration, can support at most the transmission of 4 layer data streams simultaneously.The antenna port that LTE standard is each reality has simultaneously defined the concrete mapped mode of descending common reference signaling, and LTE subscriber equipment carries out channel estimating and realizes the demodulation that receives data according to common reference signaling.For can forward compatibility LTE subscriber equipment, LTE-Advanced system must retain the common reference signaling defining in existing LTE system, simultaneously in order to support the transmission of maximum 8 antennas, is necessary to introduce other reference signaling and carries out corresponding data demodulates.
3GPP RAN1 is in progress to the discussion of 8 antenna reference signaling designs in LTE-Advanced system at present.In 56 RAN1 meetings holding in Athens in February, 2009, many companies have reached certain common recognition with regard to the design of down link reference signaling and have write motion R 1-091085 (Ericsson, Text proposal on DL reference signals, RAN1#56, Athens, Greece, Feb.09-13,2009) in.This motion is proposed: the descending reference signaling in LTE-Advanced system is divided into two large types, and a class is for the demodulation of downlink data, i.e. demodulation reference signaling, the another kind of measurement for down channel state, i.e. witness mark signaling; The structure of descending reference signaling needs to support the transmission characteristic of multiple LTE-Advanced, as multiple spot cooperation transmission (CoMP, CoordinatedMultipoint Transmission/Reception), the multiple transmission mode such as space division multiplexing (SM, SpatialMultiplexing).This motion has also been done further instruction to demodulation reference signaling, it points out that demodulation reference signaling is a kind of (precoded) through precoding (UE-specific) reference signaling based on user, and exist only in the Resource Block that base station is this dispatching user facility, the reference signaling on different layers (stream) should be mutually orthogonal.This motion also supplements the design principle of reference signaling, think that it is that the dedicated reference signaling (Dedicated RS) of LTE Rel-8 definition is to an expansion supporting that multilayer (stream) is transmitted that the demodulation reference signaling of LTE-Advanced system can seen, and for channel quality instruction (CQI, Channel Quality Indicator) estimate witness mark signaling be (Cell-specific) common reference signaling based on community, compared with common reference signaling on the each antenna defining with LTE, on time-frequency domain, can take more sparse resource.
Fig. 1 has provided the system model of the multi-user MIMO transmissions pattern defining in existing LTE.The base station of communication system comprises chnnel coding unit 101 and 102, modulating unit 103 and 104, scheduler 15, precoder 106, user's combo unit 107, common reference signaling loading unit 108a-d etc. as shown in Figure 1.
As shown in Figure 1, chnnel coding unit 101,102 adopts Turbo coding or convolutional encoding to carry out chnnel coding to the bit stream of subscriber equipment.Bit after 103,104 pairs of chnnel codings of modulating unit is modulated into OFDM symbol according to channel quality.User pairing unit 107 is carried out multi-user's pairing according to the PMI/CQI/RI information of subscriber equipment feedback.Scheduler 105 is dispatched and Resources allocation the subscriber equipment of pairing according to the feedback information from subscriber equipment.Precoder unit 106 carries out pre-encode operation to each layer data of each subscriber equipment.Common reference signaling loading unit 108 loads common reference information according to corresponding mapped mode on each antenna port.
As shown in Figure 1, LTE system base-station equipment configuration four antennas, according to the definition in standard, on every antenna, be equipped with a common reference signaling based on community, and the shared time/frequency source block of common reference signaling on each antenna is mutually orthogonal.
As shown in Figure 1, CRS
0～CRS
3represent to be respectively carried in the common reference signaling on antenna port 0～antenna port 3.LTE subscriber equipment is by the common reference signaling (CRS on each antenna port
0～CRS
3) measure, obtain the channel information of down link, and the pre-coding matrix information (PMI calculating according to the descending channel information obtaining to base station equipment feedback by up channel (comprising ascending control channel and Uplink Shared Channel), PrecodingMatrix Information), channel quality instruction (CQI, Channel Quality Indicator) and the information such as order instruction (RI, Rank Indicator).User's combo unit 107 of base station equipment and scheduler 105 carry out user's matching operation, the scheduling of resource of the line correlation of going forward side by side and distribution according to the relevant information of the user feedback receiving.
As shown in Figure 1, subscriber equipment 0 and subscriber equipment 1 successful matching, the scheduler 105 of base station equipment is this time/frequency source block identical to user equipment allocation, and the data message of these two subscriber equipmenies is mapped on different layers (layer) after to precoding separately through precoder 106.Owing to specifying in LTE standard, the subscriber equipment that carries out multi-user MIMO transmissions can only transmit a layer data.Therefore two-layer data are transmitted in the base station in Fig. 1 simultaneously, and one deck is to subscriber equipment 0, and another layer is given subscriber equipment 1.Precoding information (PMI) is separately transmitted respectively to each subscriber equipment by down control channel in base station, and subscriber equipment is according to the common reference signaling (CRS loading by common reference signaling loading unit 108a-d on each antenna
0～CRS
3) carry out channel estimating, receive the precoding information that base station sends simultaneously, in conjunction with estimating the downlink channel information that obtains and the precoding information obtaining from base station, can carry out demodulation to the data that receive, the correct data message of base station to its transmission that obtain.
Beam forming (Beamforming) transmission of single current is one of transmission mode defining in LTE standard.LTE-Advanced system also must be supported this kind of transmission mode, even may also need to support more senior multithread multi-user beamforming transmission.Datang Mobile and NORTEL company are respectively at motion R1-090185 (R1-090185, CATT, Dual ports DRSdesign for BF, RAN1#55bis, Ljubljana, Slovenia, Jan 12-16, 2009) and R 1-090754 (R1-090754, Nortel, Performance evaluation of DRS designfor multi-layer transmission, RAN1#56, Athens, Greece, Feb.09-13, 2009) in, the multiplexing scheme of multiport dedicated reference signaling (Dedicated RS) is divided into two large classes, one class is the multiplexing scheme based on frequency division, refer to for the DRS of different layers data demodulates and transmit at different Resource Unit (RE, Resource Element) on, the another kind of multiplexing scheme for dividing based on code, refers to and transmits on identical Resource Unit for the DRS of different layers data demodulates, distinguishes by different orthogonal codes.NORTEL company has also carried out link level simulation to above-mentioned two schemes in motion R1-090754, known according to its emulated data, and the DRS multiplexing scheme based on frequency division can provide even better performance similar with the DRS multiplexing scheme dividing based on code.If subscriber equipment has higher mobility or channel disperse on frequency domain, the performance of the DRS multiplexing scheme dividing based on code will sharply decline, because the orthogonality that is carried in the orthogonal code on different DRS is by destroyed.This motion is also pointed out, about the mapped mode (pattern) of DRS, need further to study.
In addition, Zhong Xing company is at motion (R1-090636, ZTE, Consideration onMulti-user beamforming, RAN1#56, Athens, Greece, Feb.09-13, 2009) in, pointed out to support the multi-user beamforming of multithread on the issuable impact of standardization, wherein mention 3 points, first is possible need to define the new reference signaling based on user, because only having defined dedicated reference signaling on antenna port 5, LTE Rel8 is used as the demodulation reference signaling of alone family single current beamforming transmission mode, for multithread multi-user beamforming, being necessary is increased the demodulation reference signaling of new antenna port or is reused the dedicated reference signaling on antenna port 5 by the mode of code division multiplexing (CDM) by the mode of frequency division multiplexing (FDM), second point is to define new control signal, comprises Downlink Control Information (DCI) form, CQI feedback model, order (Rank) pattern etc., thirdly for defining new transmission mode for DSCH Downlink Shared Channel (PDSCH), because LTE standard is not supported the transmission of multithread multi-user beam-forming.Although this motion proposes the multiple problems that exist, do not provide corresponding concrete solution.
Summary of the invention
The object of the invention is to propose the reference signaling (URS) of a kind of employing based on user and carry out for multiple subscriber equipmenies the method basis that multiple-input and multiple-output (MIMO) transmits, and corresponding base station equipment and communication system, it allows to allow subscriber equipment to adopt specific URS mapped mode to carry out channel estimating and data demodulates.
In one aspect of the invention, propose the method that the reference signaling (URS) of a kind of employing based on user carries out multiple-input and multiple-output (MIMO) transmission for multiple users, having comprised: according to from subscriber equipment feedack, described multiple subscriber equipmenies being carried out to combo; Determine that each subscriber equipment transmits the number of plies and the each layer of URS mapped mode that corresponding, multiple URS are re-used of data simultaneously; The number of plies of its URS mapped mode using and its reception data by signaled subscriber equipment; URS and user data are carried out to precoding; And by the URS after precoding and user data transmission to subscriber equipment.
The opposing party of the present invention and, a kind of base station equipment has been proposed, comprising: combo unit, according to from subscriber equipment feedack, described multiple subscriber equipmenies being carried out to combo; Scheduling unit, determines that each subscriber equipment transmits the number of plies and the each layer of URS mapped mode that corresponding, multiple URS are re-used of data simultaneously; Precoding unit, carries out precoding to URS and user data; And Transmit-Receive Unit, by signaled subscriber equipment, its URS mapped mode using and its receive the number of plies of data, and by the URS after precoding and user data transmission to subscriber equipment.
By the scheme of the embodiment of the present invention, what subscriber equipment can be correct knows the URS mapped mode that it adopts, thereby can carry out correct channel estimating and data demodulates.The scheme of this embodiment of the present invention is simply effective, can ensure communication system operation normally and efficiently.
Brief description of the drawings
By below in conjunction with brief description of the drawings the preferred embodiments of the present invention, will make of the present invention above-mentioned and other objects, features and advantages are clearer, wherein:
Fig. 1 is the system model of the multi-user MIMO transmissions pattern that defines in existing LTE;
Fig. 2 is according to the system model of the multi-user MIMO transmissions pattern of the embodiment of the present invention;
Fig. 3 is according to the process of the multi-user MIMO transmissions of the embodiment of the present invention;
Fig. 4 is according to the resource unit mapping pattern of the reference signaling based on user of the embodiment of the present invention;
Fig. 5 is the mapped mode of two URS of frequency division multiplexing;
Fig. 6 is the mapped mode of three URS of frequency division multiplexing;
Fig. 7 is the mapped mode of four URS of frequency division multiplexing;
Fig. 8 is the mapped mode of two URS of code division multiplexing;
Fig. 9 is the mapped mode of four URS of code division multiplexing;
Figure 10 is the mapped mode that frequency division multiplexing adds two URS of code division multiplexing;
Figure 11 is the mapped mode that frequency division multiplexing adds four URS of code division multiplexing.
Embodiment
The embodiment of first-selection of the present invention will be described below by reference to the accompanying drawings.In description process below, having omitted is unnecessary details and function for the present invention, obscures to prevent that the understanding of the present invention from causing.
For clear detailed elaboration performing step of the present invention, provide specific embodiments of the invention below, be applicable to support the various mobile communication system of multi-user MIMO transmissions, especially LTE-Advanced cell mobile communication systems.It should be noted that, the invention is not restricted to these application, but applicable to more other relevant communication systems.
According to embodiments of the invention, the reference signaling (URS, UE-specific RS) of (precoded) that can adopt precoding in LTE-Advanced system based on user is as the demodulation reference signaling of down link.
Fig. 2 has provided the model as the multi-user MIMO transmissions system of demodulation reference signaling according to the URS of the employing precoding of the embodiment of the present invention.
As shown in Figure 2, comprise chnnel coding unit 201 and 202, modulating unit 203 and 204, user's combo unit 206, scheduler 205, URS loading unit 207a and 207b and precoder 208 according to the base station in the communication system of the embodiment of the present invention.
As shown in Figure 2, chnnel coding unit 201 and 202 adopts Turbo coding or convolutional encoding to carry out chnnel coding to the bit stream of subscriber equipment 0 and subscriber equipment 1.Bit after 203 and 204 pairs of chnnel codings of modulating unit is modulated into OFDM symbol according to channel quality.User's combo unit 206 carries out multi-user's combo according to the PMI/CQI/RI information of subscriber equipment feedback, for example, subscriber equipment 0 and subscriber equipment 1 are fitted in same group.
In addition, scheduler 205 dispatch and the operation such as Resources allocation fitting over the subscriber equipment of same group according to the feedback information from subscriber equipment.URS loading unit 207a and 207b insert URS in every layer data of each subscriber equipment.
Each layer data and the URS thereof of precoder 208 to each subscriber equipment carries out pre-encode operation.
As shown in Figure 2, the base station equipment in LTE-Advanced system has been equipped with eight antennas.With LTE system class seemingly, on every antenna, will be equipped with the measurement of common reference signaling for down link.The design of concrete common reference signaling, can reuse the shared resource of common reference signaling using on 4 antennas that define in LTE by the density that reduces common reference signaling, because witness mark signaling and the present embodiment are irrelevant, do not do herein concrete description.LTE-Advanced subscriber equipment is measured by above-mentioned common reference signaling, obtains the channel information of down link, and the information such as PMI, CQI and RI calculating according to the descending channel information obtaining to base station equipment feedback by up channel.
User's combo unit 206 of base station equipment and scheduling unit 205 carry out the operation of user's combo, the operations such as the scheduling of resource of the line correlation of going forward side by side according to the relevant information of the user feedback receiving.As shown in Figure 2, subscriber equipment 0 and subscriber equipment 1 successful matching, the scheduler 205 of base station equipment is this time/frequency source block identical to user equipment allocation, and the data message of these two subscriber equipmenies is mapped on different layers (layer) after precoding separately.
For the multi-user MIMO transmissions pattern in LTE-Advanced system, each LTE-Advanced subscriber equipment can receive data message more than one deck simultaneously, in the present embodiment taking one deck or two-layer as example.The scheduler 205 of base station equipment is that subscriber equipment is selected URS mapped mode according to certain rule, and is mapped to as on the corresponding Resource Unit of the selected URS mapped mode of respective layer after adopting the precoding of the each layer data use of subscriber equipment to do preliminary treatment to the reference signaling of corresponding data layer by precoding unit 208.The Transmit-Receive Unit (not shown) of base station equipment is by the number of plies of its URS mapped mode using of corresponding signaled subscriber equipment and its reception data.Subscriber equipment carries out channel estimating according to the URS on each layer, thereby demodulates the data message on equivalent layer.
In order to describe more clearly the process of carrying out multi-user MIMO transmissions in above-mentioned LTE-Advanced system, in conjunction with Fig. 3, its step is described further, specific implementation step can be described below:
At step S1: base station equipment is transmitted public witness mark signaling to each subscriber equipment on each antenna, the design of concrete public-measurement reference signaling, can reuse the shared resource of common reference signaling of using on 4 antennas that define in LTE by the density of reduction common reference signaling and realize;
At step S2: subscriber equipment detects public-measurement reference signaling and obtain the channel information of down link, calculates the information such as CQI, PMI and RI;
At step S3: subscriber equipment feeds back the information such as CQI, PMI and RI calculating to base station equipment by up channel;
At step S4: user's combo unit 206 of base station equipment is according to the relevant information of user feedback, carry out multi-user's pairing, and scheduler 205 determines that each subscriber equipment transmits the number of plies and the each layer of corresponding URS mapped mode of data and carries out scheduling of resource simultaneously, it is the identical time/frequency source block of user equipment allocation of pairing;
At step S5:URS loading unit 207a and 207b, the data flow of subscriber equipment 0 and subscriber equipment 1 is loaded to URS separately, then the precoding that for example precoder 208 adopts the each layer data of subscriber equipment to use is done preliminary treatment to the reference signaling of corresponding data layer, then pretreated reference signaling is mapped to as on the corresponding Resource Unit of the selected URS mapped mode of corresponding data layer.
At step S6: base station equipment receives the number of plies of data by its URS mapped mode using of corresponding signaled subscriber equipment and its;
At step S7: the URS of base station equipment transfer pre-coding and user data are to subscriber equipment;
At step S8: subscriber equipment carries out channel estimating according to the URS receiving, and utilize the result of estimating to carry out data demodulates to user data.
Need special being pointed out that, in step S6, can distinguish by different Downlink Control Information (DCI, Downlink Control Information) forms the number of plies of subscriber equipment reception data.Suppose that subscriber equipment supports the multi-user MIMO transmissions of two layer data at most simultaneously, DCI form A can be defined as the form of one deck transfer of data, and DCI form B can be defined as the form of two-layer transfer of data.Subscriber equipment carries out blind Detecting to down control channel, if detect DCI form A, represent that this subscriber equipment only transmits a layer data, and according to the definition of the concrete field of the instruction URS mapped mode in DCI, obtain the URS mapped mode that this subscriber equipment adopts; If detect DCI form B, represent that this subscriber equipment transmits two layer data simultaneously, according to the definition of the concrete field of the instruction URS mapped mode in DCI, obtain corresponding two the URS mapped modes of these subscriber equipment two layer data.
Definition for the concrete field of above-mentioned instruction URS mapped mode need to be determined according to the multiplexing scheme of URS in system.The different Field Definition below the URS multiplexing scheme to different being adopted is described one by one.
In LTE system, define Resource Unit (RE, the Resource Element) mapped mode for the dedicated reference signaling (DRS, Dedicated RS) of beam forming (Beamforming) transmission, as shown in Figure 4.The Resource Unit that figure bend covers is the common reference signaling (CRS based on community, Cell-specific RS), the Resource Unit that in figure, grey color covers is defined for transmitting the DRS based on user, in each Physical Resource Block (PRB, PhysicalResource Block) piece, reserved 12 RE are for the transmission of DRS.
DRS mapped mode in LTE based on shown in Fig. 4, can adopt the mode of frequency division multiplexing to obtain the multiplexing mapped mode of many URS.As shown in Figure 5, two multiplexing URS represent with R5 and R6 respectively, and each URS takies 12 RE as what define in LTE in each PRB.Along with the increase of multiplexing URS number, the RE resource overhead that it takies will significantly increase, therefore can be in the density that ensures minimizing URS suitable under the prerequisite of certain performance certain in the situation that.Fig. 6 has provided three resource mapping patterns that URS is multiplexing, and in the situation that taking equally 24 RE resources, the density that reduces each URS takies 8 RE to each PRB.Similarly, Fig. 7 has provided four resource mapping patterns that URS is multiplexing, and wherein each URS takies 8 RE on each PRB.In a word, in the time of the multiplexing mapped mode of the many URS of design, can consider the density of minimizing each the URS shared resource suitable along with the increase of multiplexing number, with the signaling consumption that ensures URS in a controllable scope.
Based on above scheme, base station can, according to the distribution condition of multi-user's pairing and each user's transport layer, select appropriate URS multiplexer mode to carry out the mapping of URS.For example, when user's combo unit 206 of base station equipment transmits two subscriber equipment pairings and each subscriber equipment individual layer, the precoder 208 of base station equipment will adopt the multiplexing mapped mode of two URS shown in Fig. 5 to carry out the resource mapping of URS, and subscriber equipment is known and needed further to know after the mapped mode adopting in Fig. 5 and adopt that pattern (R5 or R6) to receive URS information actually.If when user's combo unit 206 of base station equipment matches two subscriber equipmenies and the two-layer transmission of each subscriber equipment, the precoder 208 of base station equipment will adopt every layer that the multiplexing mapped mode of four URS shown in Fig. 7 is each user to carry out the mapping of URS, and subscriber equipment is known for two-layer transmission and is adopted after the mapped mode in Fig. 7, need to further know the concrete pattern (R0 of every layer of employing, R1, R2 or R3) receive each layer of corresponding URS information.In conjunction with above-described many URS multiplexing scheme, the concrete field that defines above-mentioned instruction URS mapped mode is two parts, the multiplexing number of plies of part instruction URS, its length is relevant to the multiplexing number of plies of maximum URS of system definition, if the multiplexing number of plies of the maximum of system definition is defined as 8 layers, need 3 bits to indicate the multiplexing number of plies of URS; The call number of each layer of employing URS mapped mode of another part instruction, its length is relevant with the subscriber equipment actual transmissions number of plies with the multiplexing number of plies of maximum URS of system definition, in the time that the multiplexing number of plies of maximum of system definition is defined as 8 layers, if user device transmissions one layer data, need 3 bits to carry out index, if user device transmissions two layer data, need 6 bits to carry out index, every layer of 3 bit instruction.
DRS mapped mode in LTE based on shown in Fig. 4, can adopt the mode of another kind of frequency division multiplexing to obtain the multiplexing mapped mode of many URS.As shown in Figure 7, the mapped mode of the multiplexing number of plies of maximum URS that fixing a kind of system is supported, in figure, suppose that the multiplexing number of plies of maximum URS is 4 layers, no matter the transmission number of plies of the how many and scheduling of the number of users of base station pairing number, all adopt the mapped mode transmission URS shown in Fig. 7.As two users of base station equipment pairing (subscriber equipment A and subscriber equipment B), and when the transmission of each user's individual layer, use R0 to subscriber equipment A transmission URS, use R1 to subscriber equipment B transmission URS.The shared RE resource of R2 and R3 still needs reserved any user data information that is not used to transmit.URS multiplex mode based on such design, the concrete field that defines above-mentioned instruction URS mapped mode only needs this part of call number of indicating each layer to adopt URS mapped mode, its length is relevant with the subscriber equipment actual transmissions number of plies with the multiplexing number of plies of maximum URS of system definition, in the time that the multiplexing number of plies of maximum of system definition is defined as 8 layers, if user device transmissions one layer data, need 3 bits to carry out index, if user device transmissions two layer data, need 6 bits to carry out index, every layer of 3 bit instruction.
The multiplexing of multiple URS can also be realized by the mode of code division multiplexing.As shown in Figure 8, two URS (R0 and R1) can carry out by pair of orthogonal code multiplexing in identical time/frequency source block, and as shown in the figure, on a PRB, two URS share 12 RE and complete transmission.In the time that multiplexing URS number increases, the time/frequency source block of increase use that can be suitable ensures the performance that multiple URS are multiplexing.As shown in Figure 9, on each PRB the resource of reserved two symbols totally 24 RE be used for transmitting four URS (R0, R1, R2 and R3), four URS distinguish by 4 orthogonal codes.
Based on above design, appropriate running time-frequency resource mapped mode and orthogonal code sets can, according to the distribution condition of multi-user's pairing and each user's transport layer, be selected in base station.For example, when base station two subscriber equipmenies of pairing and the transmission of each subscriber equipment individual layer, base station equipment will adopt the running time-frequency resource mapped mode shown in Fig. 8 and multiplexing two URS of a pair of corresponding orthogonal code, and subscriber equipment is known and needed further to know after the running time-frequency resource mapped mode adopting in Fig. 5 and adopt that orthogonal code to receive corresponding URS information actually.If when base station two subscriber equipmenies of pairing and the two-layer transmission of each subscriber equipment, base station equipment will adopt multiplexing four URS of the running time-frequency resource mapped mode shown in Fig. 9, and subscriber equipment is known for two-layer transmission and adopted after the running time-frequency resource mapped mode shown in Fig. 9, need to further know that the orthogonal code of every layer of employing receives each layer of corresponding URS information.In conjunction with above-described many URS multiplexing scheme based on code division multiplexing, the concrete field that can define above-mentioned instruction URS mapped mode is two parts, the orthogonal code sets of part instruction running time-frequency resource mapped mode and use thereof, its length is relevant to the multiplexing number of plies of maximum URS of system definition, if the multiplexing number of plies of the maximum of system definition is defined as 8 layers, need 3 bits to indicate corresponding information; The call number of the orthogonal code that each layer of URS of another part instruction adopts, its length is relevant with the subscriber equipment actual transmissions number of plies with the multiplexing number of plies of maximum URS of system definition, in the time that the multiplexing number of plies of maximum of system definition is defined as 8 layers, if user device transmissions one layer data, need 3 bits to carry out index, if user device transmissions two layer data, need 6 bits to carry out index, every layer of 3 bit instruction.
Multiplexing many URS can also adopt the mode of another kind of code division multiplexing.As shown in Figure 9, the time-frequency mapped mode of the multiplexing number of plies of maximum URS that fixing a kind of system is supported, in figure, suppose that the multiplexing number of plies of maximum URS is 4 layers, no matter the transmission number of plies of the how many and scheduling of the number of users of base station pairing number, all adopt the multiplexing URS of time-frequency mapped mode shown in Fig. 9.As two users of base station equipment pairing (subscriber equipment A and subscriber equipment B), and when the transmission of each user's individual layer, use orthogonal code that R0 is corresponding to subscriber equipment A transmission URS, use orthogonal code that R1 is corresponding to subscriber equipment B transmission URS.As base station equipment three users of pairing (subscriber equipment A, subscriber equipment B and subscriber equipment C), and when each user's individual layer transmission, the orthogonal code that use R0 is corresponding is transmitted URS to subscriber equipment A, uses the orthogonal code that R1 is corresponding to transmit URS to subscriber equipment B transmission URS and orthogonal code corresponding to use R2 to subscriber equipment C.
URS multiplex mode based on such design, the concrete field that defines above-mentioned instruction URS mapped mode only needs this part of call number of indicating each layer to adopt orthogonal code, its length is relevant with the subscriber equipment actual transmissions number of plies with the multiplexing number of plies of maximum URS of system definition, in the time that the multiplexing number of plies of maximum of system definition is defined as 8 layers, if user device transmissions one layer data, needs 3 bits to carry out index, if user device transmissions two layer data, need 6 bits to carry out index, every layer of 3 bit instruction.
The mode that multiplexing many URS can also add code division multiplexing by frequency division multiplexing realizes.Its basic principle is the scheme that adopts frequency division multiplexing in the time that less URS is multiplexing, when adopt the scheme that adds again code division multiplexing on the basis at frequency division multiplexing in the time that more URS is multiplexing.As shown in figure 10, in the time only having two URS multiplexing, each URS (R0 and R1) takies 12 mutually orthogonal RE resources and transmits, without loading any orthogonal code.In the time that four URS are multiplexing, as shown in figure 11, in the shared RE resource of URS of transmission as shown in figure 10, transmit two URS by two orthogonal codes simultaneously, use constant in the situation that in resource like this, can expand the multiplexing number of URS.For the higher subscriber equipment of movement velocity, can the URS that they use be worked in the mode of frequency division multiplexing by limiting the subscriber equipment number of its pairing, can effectively resist the orthogonality of the orthogonal code that the rapid fading of channel may cause and destroy problem.
Based on the multiplexing scheme of above-mentioned URS, its signaling structure can be divided into two parts, Part I is group indication bit, if multiplex mode is frequency division multiplexing, the multiplexing number of plies of this group indication bit instruction URS, if being frequency division multiplexing, multiplex mode adds code division multiplexing, the orthogonal code sets of this group indication bit instruction running time-frequency resource mapped mode and use thereof, and can implicit expression according to this group indication bit know adopt frequency division multiplexing mode or the frequency division multiplexing point multiplex mode of raising the price; Part III is index indication bit in group, and frequency division multiplexing if, indicates each layer of call number that adopts URS mapped mode, and frequency division multiplexing adds code division multiplexing if, the call number of the orthogonal code that each layer of URS of this indication bit adopts.
Realize the scheme of multi-user MIMO transmissions by employing URS set forth above, can realize the normal transmission of multiuser MIMO.The complexity of system is low, has met the demand of real system and LTE-Advanced system.
So far invention has been described in conjunction with the preferred embodiments.Should be appreciated that, those skilled in the art without departing from the spirit and scope of the present invention, can carry out various other change, replacement and interpolations.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.
Claims (22)
1. the method that the reference signaling (URS) of employing based on user carries out multiple-input and multiple-output (MIMO) transmission for multiple users, comprising:
According to from subscriber equipment feedack, described multiple subscriber equipmenies being carried out to combo;
Determine that each subscriber equipment transmits the number of plies and the each layer of URS mapped mode that corresponding, multiple URS are re-used of data simultaneously;
The number of plies of its URS mapped mode using and its reception data by signaled subscriber equipment;
URS and user data are carried out to precoding; And
By the URS after precoding and user data transmission to subscriber equipment.
2. method according to claim 1, wherein, the step of URS and user data being carried out to precoding comprises:
The precoding that adopts the each layer data of subscriber equipment to use is carried out preliminary treatment to the reference signaling of corresponding data layer;
Pretreated reference signaling is mapped to as on the corresponding data layer corresponding running time-frequency resource of selected URS mapped mode unit.
3. method according to claim 1, wherein subscriber equipment carries out channel estimating according to the URS receiving, and utilizes the result of channel estimating to carry out data demodulates to the user data receiving.
4. method according to claim 1, wherein, distinguishes the number of plies of subscriber equipment reception data by different descending control information formats.
5. method according to claim 1, wherein, adopts frequency division multiplexing mode to realize multiple URS multiplexing, and the field of instruction URS mapped mode comprises: Part I, the multiplexing number of plies of instruction URS; And Part II, indicate each layer of call number that adopts URS mapped mode.
6. method according to claim 5, wherein, adopts frequency division multiplexing mode to realize multiple URS multiplexing, and reduces the density of the shared running time-frequency resource of each URS along with the increase of the multiplexing number of URS, with the signaling consumption that ensures URS in the scope of specifying.
7. method according to claim 1, wherein, adopts frequency division multiplexing mode to realize multiple URS multiplexing, and the call number of each layer of employing URS mapped mode of the field instruction of instruction URS mapped mode.
8. method according to claim 1, wherein, adopts code division multiplexing mode to realize multiple URS multiplexing, and the field of instruction URS mapped mode comprises: Part I, the orthogonal code sets of instruction running time-frequency resource mapped mode and use thereof; And Part II, indicate the each layer of call number of orthogonal code adopting.
9. method according to claim 8, wherein, in the time that multiplexing URS number increases, ensures the performance of multiple URS code division multiplexings by increasing the running time-frequency resource unit of use.
10. method according to claim 1, wherein, adopts code division multiplexing mode to realize multiple URS multiplexing, and the call number of the each layer of employing orthogonal code of field instruction of instruction URS mapped mode.
11. methods according to claim 1, wherein, to realize multiple URS multiplexing for a point multiplex mode to adopt frequency division multiplexing to raise the price, and the field of instruction URS mapped mode comprises Part I and Part II: Part I is group indication bit, if multiplex mode is frequency division multiplexing, the multiplexing number of plies of this group indication bit instruction URS, if being frequency division multiplexing, multiplex mode adds code division multiplexing, the orthogonal code sets of this group indication bit instruction running time-frequency resource mapped mode and use thereof, concrete URS multiplex mode is that frequency division multiplexing or frequency division multiplexing add code division multiplexing and can pass through the expression of this group indication bit implicit expression, Part II is index indication bit in group, and frequency division multiplexing if, indicates each layer of call number that adopts URS mapped mode, and frequency division multiplexing adds code division multiplexing if, the call number of the orthogonal code that each layer of URS of this indication bit adopts.
12. 1 kinds of base station equipments, comprising:
Combo unit, according to from subscriber equipment feedack, described multiple subscriber equipmenies being carried out to combo;
Scheduling unit, determines that each subscriber equipment transmits the number of plies and the each layer of URS mapped mode that corresponding, multiple reference signalings (URS) based on user are re-used of data simultaneously;
Precoding unit, carries out precoding to URS and user data; And
Transmit-Receive Unit, by signaled subscriber equipment, its URS mapped mode using and its receive the number of plies of data, and by the URS after precoding and user data transmission to subscriber equipment.
13. base station equipments according to claim 12, wherein, the precoding that described precoding unit adopts the each layer data of subscriber equipment to use is carried out preliminary treatment to the reference signaling of corresponding data layer, and pretreated reference signaling is mapped to as on the corresponding data layer corresponding running time-frequency resource of selected URS mapped mode unit.
14. base station equipments according to claim 12, wherein, distinguish the number of plies of subscriber equipment reception data by different descending control information formats.
15. base station equipments according to claim 12, wherein, adopt frequency division multiplexing mode to realize multiple URS multiplexing, and the field of instruction URS mapped mode comprises: Part I, the multiplexing number of plies of instruction URS; And Part II, indicate each layer of call number that adopts URS mapped mode.
16. base station equipments according to claim 15, wherein, adopt frequency division multiplexing mode to realize multiple URS multiplexing, and reduce the density of the shared running time-frequency resource of each URS along with the increase of the multiplexing number of URS, with the signaling consumption that ensures URS in the scope of specifying.
17. base station equipments according to claim 12, wherein, adopt frequency division multiplexing mode to realize multiple URS multiplexing, and the call number of each layer of employing URS mapped mode of the field instruction of instruction URS mapped mode.
18. base station equipments according to claim 12, wherein, adopt code division multiplexing mode to realize multiple URS multiplexing, and the field of instruction URS mapped mode comprises: Part I, the orthogonal code sets of instruction running time-frequency resource mapped mode and use thereof; And Part II, indicate the each layer of call number of orthogonal code adopting.
19. base station equipments according to claim 18, wherein, in the time that multiplexing URS number increases, ensure the performance of multiple URS code division multiplexings by increasing the running time-frequency resource unit of use.
20. base station equipments according to claim 12, wherein, adopt code division multiplexing mode to realize multiple URS multiplexing, and the call number of the each layer of employing orthogonal code of field instruction of instruction URS mapped mode.
21. base station equipments according to claim 12, wherein, to realize multiple URS multiplexing for a point multiplex mode to adopt frequency division multiplexing to raise the price, and the field of instruction URS mapped mode comprises Part I and Part II: Part I is group indication bit, if multiplex mode is frequency division multiplexing, the multiplexing number of plies of this group indication bit instruction URS, if being frequency division multiplexing, multiplex mode adds code division multiplexing, the orthogonal code sets of this group indication bit instruction running time-frequency resource mapped mode and use thereof, concrete URS multiplex mode is that frequency division multiplexing or frequency division multiplexing add code division multiplexing and can pass through the expression of this group indication bit implicit expression, Part II is index indication bit in group, and frequency division multiplexing if, indicates each layer of call number that adopts URS mapped mode, and frequency division multiplexing adds code division multiplexing if, the call number of the orthogonal code that each layer of URS of this indication bit adopts.
22. 1 kinds of communication systems, comprise the base station equipment as described in one of claim 12～21, and user terminal, described user terminal carries out channel estimating according to the reference signaling based on user (URS) receiving, and utilizes the result of channel estimating to carry out data demodulates to the user data receiving.
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| CN102457313A (en) * | 2010-10-22 | 2012-05-16 | 中兴通讯股份有限公司 | Method and device for finishing multi-user multi-layer beam forming in time division duplex |
| KR101581601B1 (en) * | 2011-08-12 | 2015-12-30 | 블랙베리 리미티드 | Methods of channel state information feedback and transmission in coordinated multipoint wireless communications system |
| CN103036638B (en) * | 2011-09-30 | 2016-08-10 | 华为技术有限公司 | The transmission method of control information, method of reseptance and device |
| EP3160210B1 (en) | 2014-07-11 | 2019-10-09 | Huawei Technologies Co. Ltd. | Data transmission method, user equipment and base station |
| WO2017026974A1 (en) * | 2015-08-12 | 2017-02-16 | Intel Corporation | Multi-user multiple input multiple output communication systems and methods |
| EP3753120A4 (en) | 2018-02-12 | 2021-03-03 | ZTE Corporation | Signal transmission and reception using multiple antennas |
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| WO2008045001A1 (en) * | 2006-10-18 | 2008-04-17 | Panasonic Corporation | A method and system for data transmission in a multiple input multiple output (mimo) system |
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