CN101834642A - 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 the mobile communication technology field, particularly relate to multiple-input and multiple-output (MIMO) transmission is carried out in a kind of employing at a plurality of users based on user's reference signaling (URS) method, base station equipment and communication system.
Background technology
Multiple-input, multiple-output (MIMO) technology has become one of key technology of next generation wireless communication system.At present, had much about point-to-point Single User MIMO systematic research.In actual applications, system often needs a base station while and a plurality of subscriber equipment to communicate, such as modal cellular system and WLAN (wireless local area network) etc.Therefore, multiuser MIMO (Multi-user MIMO) systematic research of relevant point-to-multipoint is also just arisen at the historic moment, and it is more complicated more than Single User MIMO.
Because each user's channel is independently of one another in the multi-user MIMO system, therefore, the user generally can know the channel condition information of oneself, but is difficult to obtain other users' channel information, pays very big cost and obtain other subscriber channel informational needs.That is to say and be difficult between the user cooperate.In contrast, have ready conditions and obtain the channel condition information of all communication users in the base station, and for tdd systems, the reference signaling of the up link that this can be received by the base station obtains, and then needs to obtain by feedback for frequency division duplex system.Therefore in addition, the disposal ability of base station is also much better than than subscriber equipment, generally all is to do Signal Pretreatment (such as beam shaping) by the base station before transmitting, and disturbs or carries out reprocessing and distinguish the user after receiving signal to eliminate, to suppress.The multiuser MIMO technology by among the standard that is used for LTE of success, can be predicted in the LTE-Advanced system, and it also will be 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, defined the antenna configurations that the LTE-Advanced system need support maximum 8x8 2008-06), the base station equipment that is to say the LTE-Advanced system has disposed 8 antennas, can support the transmission of 8 layer data stream at most simultaneously.And in the LTE system, the base station maximum can be supported the antenna configurations of 4x4, can support the transmission of 4 layer data stream at most simultaneously.The LTE standard is the concrete mapped mode that each actual antenna port has defined descending common reference signaling simultaneously, and the LTE subscriber equipment carries out channel estimating according to the common reference signaling and realizes receiving the demodulation of data.For can forward compatibility LTE subscriber equipment, the LTE-Advanced system must keep the common reference signaling that defines in the 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 signalings design in the LTE-Advanced system at present.In 56 RAN1 meetings that hold in Athens in February, 2009, many companies have reached certain common recognition and have write motion R1-091085 (Ericsson with regard to the design of down link reference signaling, Text proposal on DL reference signals, RAN1#56, Athens, Greece, Feb.09-13,2009) in.This motion is proposed: the descending reference signaling in the LTE-Advanced system is divided into two major types, and a class is used for the demodulation of downlink data, i.e. demodulation reference signaling, the another kind of measurement that is used for the 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, Coordinated Multipoint Transmission/Reception), space division multiplexing multiple transmission modes such as (SM, Spatial Multiplexing).This motion has also been done further instruction to the demodulation reference signaling, it points out that the demodulation reference signaling is (precoded) of the precoding of a kind of process (UE-specific) reference signaling based on the user, and exist only in the base station in the Resource Block of this dispatching user facility, the reference signaling on the different layers (stream) should be mutually orthogonal.This motion also replenishes the design principle of reference signaling, think that the demodulation reference signaling of LTE-Advanced system can see that dedicated reference signaling (Dedicated RS) for LTE Rel-8 definition is to an expansion supporting that multilayer (stream) is transmitted, indicate (CQI and be used for channel quality, Channel Quality Indicator) the witness mark signaling of Gu Jiing is (Cell-specific) common reference signaling based on the sub-district, compare with the common reference signaling on each antenna of LTE definition, on time-frequency domain, can take more sparse resource.
Fig. 1 has provided the system model of the multiuser MIMO transmission mode that defines in the 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 employing Turbo codings or convolutional encoding are carried out chnnel coding to the bit stream of subscriber equipment.Bit after 103,104 pairs of chnnel codings of modulating unit is modulated into the 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 the standard, be equipped with a common reference signaling on the every antenna, and the shared time of the common reference signaling on each antenna is mutually orthogonal based on the sub-district.
As shown in Figure 1, CRS
0～CRS
3Expression is carried in the common reference signaling on antenna port 0～antenna port 3 respectively.The 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 that calculates according to the descending channel information that obtains to base station equipment feedback by up channel (comprising ascending control channel and Uplink Shared Channel), Precoding Matrix Information), channel quality indication (CQI, Channel Quality Indicator) and order indication information such as (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 that receives.
As shown in Figure 1, subscriber equipment 0 and subscriber equipment 1 successful matching, then the scheduler 105 of base station equipment is this time identical to user equipment allocation, is mapped on the different layers (layer) after 106 pairs of precodings separately of data message process precoder of these two subscriber equipmenies.Owing to stipulate in the LTE standard, the subscriber equipment that carries out the multiuser MIMO transmission can only transmit a layer data.Therefore the base station among Fig. 1 is transmitted two-layer data simultaneously, and one deck is given subscriber equipment 0, and another layer is given subscriber equipment 1.Each subscriber equipment is given by the precoding information (PMI) that down control channel transmits respectively separately in the base station, and subscriber equipment is according to the common reference signaling (CRS that is loaded by common reference signaling loading unit 108a-d on each antenna
0～CRS
3) carry out channel estimating, receive the precoding information that the base station sends simultaneously, downlink channel information that obtains in conjunction with estimation and the precoding information that obtains from the base station can carry out demodulation to the data that receive, the correct data message of base station to its transmission that obtain.
The beam shaping of single current (Beamforming) transmission is one of transmission mode that defines in the LTE standard.The LTE-Advanced system also must support this kind 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 R1-090754 (R1-090754, Nortel, Performance evaluation of DRS design for 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 big classes, one class is based on the multiplexing scheme of frequency division, refers to the DRS that is used for the different layers data demodulates and is transmitted on the different Resource Unit (RE, Resource Element); Another kind of is the multiplexing scheme that divides based on sign indicating number, refers to the DRS that is used for the different layers data demodulates and transmits on identical Resource Unit, distinguishes by different orthogonal codes.NORTEL company has also carried out link level simulation to above-mentioned two kinds of schemes in motion R1-090754, according to its emulated data as can be known, and the similar even more performance of DRS multiplexing scheme that can provide and divide based on sign indicating number based on the DRS multiplexing scheme of frequency division.If subscriber equipment has higher mobility or channel disperse on frequency domain, the performance of the DRS multiplexing scheme that divides based on sign indicating number will sharply descend, because the orthogonality that is carried in the orthogonal code on the different DRS is with destroyed.This motion points out that also the mapped mode (pattern) about DRS is still waiting further to study.
In addition, in emerging company at motion (R1-090636, ZTE, Consideration onMulti-user beamforming, RAN1 #56, Athens, Greece, Feb.09-13,2009) pointed out in to support the multi-user beamforming of multithread to the issuable influence of standardization, wherein mention 3 points, first is possible need to define the new reference signaling based on the user, because LTE Rel8 has only defined the demodulation reference signaling that dedicated reference signaling on the antenna port 5 is used as single user's single current beamforming transmission mode, for multithread multi-user beamforming, the mode by frequency division multiplexing (FDM) of being necessary increases the demodulation reference signaling of new antenna port or reuses dedicated reference signaling on the antenna port 5 by the mode of code division multiplexing (CDM); Second is the control signaling that needs definition new, comprises Downlink Control Information (DCI) form, CQI feedback model, order (Rank) pattern etc.; Thirdly be to be the new transmission mode of DSCH Downlink Shared Channel (PDSCH) definition, because the LTE standard is not supported the transmission of multithread multi-user beam-forming.Though this motion proposes a plurality of problems of existence, do not provide corresponding concrete solution.
Summary of the invention
The objective of the invention is to propose multiple-input and multiple-output (MIMO) transmission is carried out in a kind of employing at a plurality of subscriber equipmenies based on user's reference signaling (URS) method basis, and relevant 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, proposed a kind of employing based on user's reference signaling (URS) at the method that a plurality of users carry out multiple-input and multiple-output (MIMO) transmission, comprising: according to described a plurality of subscriber equipmenies being carried out combo from the subscriber equipment feedack; Determine each subscriber equipment to transmit the number of plies of data and the URS mapped mode that pairing, a plurality of URS of each layer is re-used simultaneously; Receive the number of plies of data by its employed URS mapped mode of signaled subscriber equipment and its; URS and user data are carried out precoding; And give subscriber equipment with the URS after the precoding and user data transmission.
The opposing party of the present invention and, a kind of base station equipment has been proposed, comprising: the combo unit, according to described a plurality of subscriber equipmenies being carried out combo from the subscriber equipment feedack; Scheduling unit determines each subscriber equipment to transmit the number of plies of data and the URS mapped mode that pairing, a plurality of URS of each layer is re-used simultaneously; Precoding unit is carried out precoding to URS and user data; And Transmit-Receive Unit, receive the number of plies of data by its employed URS mapped mode of signaled subscriber equipment and its, and give subscriber equipment URS after the precoding and user data transmission.
By the scheme of the embodiment of the invention, 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 invention is simply effective, can guarantee communication system operation normally and efficiently.
Description of drawings
By below in conjunction with description of drawings the preferred embodiments of the present invention, will make above-mentioned and other purpose of the present invention, feature and advantage clearer, wherein:
Fig. 1 is the system model of the multiuser MIMO transmission mode that defines in the existing LTE;
Fig. 2 is the system model according to the multiuser MIMO transmission mode of the embodiment of the invention;
Fig. 3 is the process according to the multiuser MIMO transmission of the embodiment of the invention;
Fig. 4 is the Resource Unit mapped mode based on user's reference signaling according to the embodiment of the 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 raise the price mapped mode of multiplexing two URS of branch of frequency division multiplexing;
Figure 11 is the raise the price mapped mode of multiplexing four URS of branch of frequency division multiplexing.
Embodiment
The embodiment of first-selection of the present invention will be described below in conjunction with the accompanying drawings.In the 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, provided specific embodiments of the invention below, be applicable to various mobile communication system, especially the LTE-Advanced cell mobile communication systems of supporting the multiuser MIMO transmission.Need to prove, the invention is not restricted to these and use, but applicable to more other relevant communication systems.
According to embodiments of the invention, can adopt (precoded) of precoding in the LTE-Advanced system based on user's reference signaling (URS, UE-specific RS) demodulation reference signaling as down link.
Fig. 2 has provided the model as the multiuser MIMO transmission system of demodulation reference signaling according to the URS of the employing precoding of the embodiment of the 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 invention.
As shown in Figure 2, chnnel coding unit 201 and 202 employing Turbo codings or convolutional encoding are carried out chnnel coding to the bit stream of subscriber equipment 0 and subscriber equipment 1.Bit after the modulating unit 203 and the 204 pairs of chnnel codings is modulated into the 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 is fitted in same group.
In addition, scheduler 205 is according to from the feedback information of subscriber equipment the subscriber equipment that fits over same group being dispatched and operation such as Resources allocation. URS loading unit 207a and 207b insert URS on every layer data of each subscriber equipment.
As shown in Figure 2, the base station equipment in the LTE-Advanced system has been equipped with eight antennas.With the LTE system class seemingly, will be equipped with the measurement that the common reference signaling is used for down link on the every antenna.The design of concrete common reference signaling, can reuse the shared resource of using on 4 antennas that define among the LTE of common reference signaling by the density that reduces the common reference signaling, because witness mark signaling and present embodiment are irrelevant, do not do concrete description herein.The LTE-Advanced subscriber equipment is measured by above-mentioned common reference signaling, obtains the channel information of down link, and information such as the PMI, the CQI that calculate according to the descending channel information that obtains to base station equipment feedback by up channel and RI.
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 scheduling of resource of the line correlation of going forward side by side according to the relevant information of the user feedback that receives.As shown in Figure 2, subscriber equipment 0 and subscriber equipment 1 successful matching, then the scheduler 205 of base station equipment is this time identical to user equipment allocation, and the data message of these two subscriber equipmenies is mapped on the different layers (layer) after through precoding separately.
For the multiuser MIMO transmission mode in the LTE-Advanced system, each LTE-Advanced subscriber equipment can receive the above data message of one deck simultaneously, in the present embodiment with one deck or two-layer be example.The scheduler 205 of base station equipment is that subscriber equipment is selected the URS mapped mode according to certain rule, and is mapped to on the pairing Resource Unit of the selected URS mapped mode of respective layer after by the precoding that precoding unit 208 adopts each layer data of subscriber equipment to use the reference signaling of corresponding data layer being done preliminary treatment.The Transmit-Receive Unit (not shown) of base station equipment receives the number of plies of data by its employed URS mapped mode of corresponding signaled subscriber equipment and its.Subscriber equipment carries out channel estimating according to the URS on each layer, thereby demodulates the data message on the equivalent layer.
In order to describe the process of carrying out the multiuser MIMO transmission in the above-mentioned LTE-Advanced system more clearly, in conjunction with Fig. 3 its step is described further, the specific implementation step can be described below:
At step S1: base station equipment is transmitted public witness mark signaling and is given each subscriber equipment on each antenna, the design of concrete public-measurement reference signaling can be reused the shared resource of using on 4 antennas that define among the LTE of common reference signaling by the density that reduces the common reference signaling and be realized;
At step S2: subscriber equipment detects the channel information that the public-measurement reference signaling obtains down link, calculates information such as CQI, PMI and RI;
At step S3: information such as the CQI that subscriber equipment obtains by the up channel feedback calculation, PMI and RI are given base station equipment;
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 each subscriber equipmenies of decision transmit the number of plies and the pairing URS mapped mode of each layer of data simultaneously and carry out scheduling of resource, are the identical time 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 separately URS, for example precoder 208 adopts the precoding of each layer data use of subscriber equipment that the reference signaling of corresponding data layer is done preliminary treatment then, then pretreated reference signaling is mapped to on the pairing 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 employed URS mapped mode of corresponding signaled subscriber equipment and its;
At step S7: the URS of base station equipment transfer pre-coding and user data are given subscriber equipment;
At step S8: subscriber equipment carries out channel estimating according to the URS that receives, and utilizes results estimated that user data is carried out data demodulates.
Need special being pointed out that, in step S6, can distinguish the number of plies that subscriber equipment receives data by different Downlink Control Information (DCI, Downlink Control Information) forms.Suppose that subscriber equipment supports the multiuser MIMO transmission of two layer data at most simultaneously, then 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 then this subscriber equipment only transmits a layer data, and, obtain the URS mapped mode that this subscriber equipment adopts according to the definition of the concrete field of the indication URS mapped mode among the DCI; If detect DCI form B, represent that then this subscriber equipment transmits two layer data simultaneously, according to the definition of the concrete field of the indication URS mapped mode among the DCI, obtain pairing two the URS mapped modes of these subscriber equipment two layer data.
Definition for the concrete field of above-mentioned indication URS mapped mode need be determined according to the multiplexing scheme of URS in the system.The different Field Definition that will be adopted different URS multiplexing schemes is described one by one below.
Defined Resource Unit (RE, the Resource Element) mapped mode of the dedicated reference signaling (DRS, Dedicated RS) that is used for beam shaping (Beamforming) transmission in the LTE system, as shown in Figure 4.The Resource Unit that the figure bend covers is the common reference signaling (CRS based on the sub-district, Cell-specific RS), the Resource Unit that grey color covers among the figure is defined the DRS that is used to transmit based on the user, reserve the transmission that 12 RE are used for DRS in each Physical Resource Block (PRB, Physical Resource Block) piece.
Based on DRS mapped mode among the LTE shown in Figure 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 what define among each URS such as the LTE takies 12 RE in each PRB.Along with the increase of multiplexing URS number, the RE resource overhead that it takies will significantly increase, therefore can be under the prerequisite that guarantees certain performance under certain situation the density of suitable minimizing URS.Fig. 6 has provided three resource mapped modes that URS is multiplexing, and under the situation that takies 24 RE resources equally, the density that reduces each URS takies 8 RE to each PRB.Similarly, Fig. 7 has provided four resource mapped modes that URS is multiplexing, and wherein each URS takies 8 RE on each PRB.In a word, when the multiplexing mapped mode of the many URS of design, can consider density along with the suitable shared resource of each URS of minimizing of the increase of multiplexing number, with the signaling consumption that guarantees URS in a controllable scope.
Based on above scheme, the base station can select appropriate URS multiplexer mode to carry out the mapping of URS according to the distribution condition of multi-user's pairing and each user's transport layer.For example, when user's combo unit 206 of base station equipment transmits two subscriber equipment pairings and each subscriber equipment individual layer, then the precoder 208 of base station equipment will adopt the multiplexing mapped mode of two URS shown in Figure 5 to carry out the resource mapping of URS, and subscriber equipment is known and needed further to know behind the mapped mode that adopts among Fig. 5 and adopt that pattern (R5 or R6) to receive URS information actually.If when 206 two subscriber equipmenies of pairing and the two-layer transmission of each subscriber equipment of user's combo unit of base station equipment, then the precoder 208 of base station equipment will adopt the every layer mapping of carrying out URS of the multiplexing mapped mode of four URS shown in Figure 7 for each user, and subscriber equipment is known for behind the mapped mode among two-layer transmission and employing Fig. 7, need further know the concrete pattern (R0 of every layer of employing, R1, R2 or R3) receive the URS information of each layer correspondence.In conjunction with above-described many URS multiplexing scheme, the concrete field that defines above-mentioned indication URS mapped mode is two parts, the multiplexing number of plies of part indication URS, its length is relevant with the multiplexing number of plies of maximum URS of system definition, if the maximum multiplexing number of plies of system definition is defined as 8 layers, then need 3 bits to indicate the multiplexing number of plies of URS; Another part is indicated the call number of each layer employing 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, when the maximum multiplexing number of plies of system definition is defined as 8 layers, if user device transmissions one layer data, then need 3 bits to come index, if user device transmissions two layer data then need 6 bits to come index, every layer 3 bit indication.
Based on DRS mapped mode among the LTE shown in Figure 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 supports, the hypothesis maximum URS multiplexing number of plies is 4 layers among the figure, and no matter what of the transmission number of plies of what and scheduling of the number of users of base station pairing are all adopted mapped mode transmission URS shown in Figure 7.As base station equipment pairing two users (subscriber equipment A and subscriber equipment B), and during each user's individual layer transmission, use R0 to give subscriber equipment A transmission URS, use R1 to give subscriber equipment B transmission URS.The shared RE resource of R2 and R3 then still needs reservation not to be used to transmit the Any user data message.URS multiplex mode based on such design, the concrete field that defines above-mentioned indication URS mapped mode only need be indicated this part of call number of each layer employing 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, when the maximum multiplexing number of plies of system definition is defined as 8 layers, if user device transmissions one layer data, then need 3 bits to come index, if user device transmissions two layer data, then need 6 bits to come index, every layer 3 bit indication.
The multiplexing of a plurality of 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 multiplexing by the pair of orthogonal sign indicating number on identical time, and as shown in the figure, two shared 12 RE of URS finish transmission on a PRB.When multiplexing URS number increased, the time that increase that can be suitable is used guaranteed the performance that a plurality of URS are multiplexing.As shown in Figure 9, totally 24 RE of the resource of reserving two symbols on each PRB is used to transmit four URS (R0, R1, R2 and R3), and four URS distinguish by 4 orthogonal codes.
Based on above design, appropriate running time-frequency resource mapped mode and orthogonal code sets can be selected according to the distribution condition of multi-user's pairing and each user's transport layer in the base station.For example, when base station two subscriber equipmenies of pairing and the transmission of each subscriber equipment individual layer, then base station equipment will adopt running time-frequency resource mapped mode shown in Figure 8 and multiplexing two URS of a pair of corresponding orthogonal code, and subscriber equipment is known and needed further to know behind the running time-frequency resource mapped mode that adopts among 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, then base station equipment will adopt multiplexing four URS of running time-frequency resource mapped mode shown in Figure 9, and subscriber equipment is known for after two-layer transmission and adopting running time-frequency resource mapped mode shown in Figure 9, need know further that the orthogonal code of every layer of employing receives the URS information of each layer correspondence.In conjunction with above-described many URS multiplexing scheme based on code division multiplexing, the concrete field that can define above-mentioned indication URS mapped mode is two parts, the orthogonal code sets of part indication running time-frequency resource mapped mode and use thereof, its length is relevant with the multiplexing number of plies of maximum URS of system definition, if the maximum multiplexing number of plies of system definition is defined as 8 layers, then need 3 bits to indicate corresponding information; Another part is indicated the call number of the orthogonal code that each layer URS adopted, 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, when the maximum multiplexing number of plies of system definition is defined as 8 layers, if user device transmissions one layer data, then need 3 bits to come index, if user device transmissions two layer data then need 6 bits to come index, every layer 3 bit indication.
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 supports, the hypothesis maximum URS multiplexing number of plies is 4 layers among the figure, and no matter what of the transmission number of plies of what and scheduling of the number of users of base station pairing are all adopted the multiplexing URS of time-frequency mapped mode shown in Figure 9.As base station equipment pairing two users (subscriber equipment A and subscriber equipment B), and during each user's individual layer transmission, use the orthogonal code of R0 correspondence to give subscriber equipment A transmission URS, use the orthogonal code of R1 correspondence to give subscriber equipment B transmission URS.As base station equipment pairing three users (subscriber equipment A, subscriber equipment B and subscriber equipment C), and during each user's individual layer transmission, use the orthogonal code of R0 correspondence to give subscriber equipment A transmission URS, use the orthogonal code of R1 correspondence to give subscriber equipment B transmission URS and use the orthogonal code of R2 correspondence to give subscriber equipment C transmission URS.
URS multiplex mode based on such design, the concrete field that defines above-mentioned indication URS mapped mode only need be indicated this part of call number of each layer employing 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, when the maximum multiplexing number of plies of system definition is defined as 8 layers, if user device transmissions one layer data then needs 3 bits to come index, if user device transmissions two layer data, then need 6 bits to come index, every layer 3 bit indication.
Multiplexing many URS can also realize by the frequency division multiplexing multiplexing mode of branch of raising the price.Its basic principle is to adopt the scheme of frequency division multiplexing when less URS is multiplexing, the multiplexing scheme of branch of raising the price again on the basis of adopting when more URS is multiplexing at frequency division multiplexing.As shown in figure 10, when having only two URS multiplexing, each URS (R0 and R1) takies 12 mutually orthogonal RE resources and transmits, and need not to load any orthogonal code.When four URS are multiplexing, as shown in figure 11, on the shared RE resource of URS of transmission as shown in figure 10, transmit two URS simultaneously, use under the constant situation in resource like this, can expand the multiplexing number of URS by two orthogonal codes.For the higher subscriber equipment of movement velocity, can make that they employed URS works in the mode of frequency division multiplexing by the subscriber equipment number that limits its pairing, can effectively resist the orthogonality of the orthogonal code that the rapid fading of channel may cause and destroy problem.
Multiplexing scheme based on above-mentioned URS, its signaling structure can separated into two parts, first is the group indication bit, if multiplex mode is a frequency division multiplexing, then should the group indication bit indicate the multiplexing number of plies of URS, the branch of raising the price is multiplexing if multiplex mode is a frequency division multiplexing, then should group indication bit indication running time-frequency resource mapped mode and the orthogonal code sets of use, according to this group indication bit can implicit expression know that adopt the frequency division multiplexing mode still is the frequency division multiplexing branch multiplex mode of raising the price; Third part if be frequency division multiplexing, is then indicated the call number of each layer employing URS mapped mode for index indication bit in the group, if for the frequency division multiplexing branch of raising the price multiplexing, the call number of the orthogonal code that adopted of this each layer of indication bit URS then.
Realize the scheme that multiuser MIMO transmits by employing URS set forth above, can realize the normal transmission of multiuser MIMO.The complexity of system is low, has satisfied 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 can carry out various other change, replacement and interpolations under the situation that does not break away from the spirit and scope of the present invention.Therefore, scope of the present invention is not limited to above-mentioned specific embodiment, and should be limited by claims.
Claims (22)
1. an employing, comprising at the method that a plurality of users carry out multiple-input and multiple-output (MIMO) transmission based on user's reference signaling (URS):
According to described a plurality of subscriber equipmenies being carried out combo from the subscriber equipment feedack;
Determine each subscriber equipment to transmit the number of plies of data and the URS mapped mode that pairing, a plurality of URS of each layer is re-used simultaneously;
Receive the number of plies of data by its employed URS mapped mode of signaled subscriber equipment and its;
URS and user data are carried out precoding; And
Give subscriber equipment with URS after the precoding and user data transmission.
2. method according to claim 1, wherein, the step of URS and user data being carried out precoding comprises:
The precoding that each layer data of employing subscriber equipment is used is carried out preliminary treatment to the reference signaling of corresponding data layer;
Pretreated reference signaling is mapped to on the pairing running time-frequency resource of the selected URS mapped mode of the corresponding data layer unit.
3. method according to claim 1, wherein subscriber equipment carries out channel estimating according to the URS that receives, and utilizes the result of channel estimating that the user data that receives is carried out data demodulates.
4. method according to claim 1 wherein, is distinguished the number of plies that subscriber equipment receives data by different descending control information formats.
5. method according to claim 1 wherein, adopts the frequency division multiplexing mode to realize that a plurality of URS are multiplexing, and the field of indication URS mapped mode comprises: first, the multiplexing number of plies of indication URS; And second portion, indicate the call number of each layer employing URS mapped mode.
6. method according to claim 5 wherein, adopts the frequency division multiplexing mode to realize that a plurality of URS are multiplexing, and the density that reduces the shared running time-frequency resource of each URS along with the increase of the multiplexing number of URS, with the signaling consumption that guarantees URS in the scope of appointment.
7. method according to claim 1 wherein, adopts the frequency division multiplexing mode to realize that a plurality of URS are multiplexing, and the field of indication URS mapped mode is indicated the call number of each layer employing URS mapped mode.
8. method according to claim 1 wherein, adopts the code division multiplexing mode to realize that a plurality of URS are multiplexing, and the field of indication URS mapped mode comprises: first, the orthogonal code sets of indication running time-frequency resource mapped mode and use thereof; And second portion, indicate the call number of the orthogonal code of each layer employing.
9. method according to claim 8, wherein, when multiplexing URS number increases, by increasing the performance that the running time-frequency resource unit that uses guarantees a plurality of URS code division multiplexings.
10. method according to claim 1 wherein, adopts the code division multiplexing mode to realize that a plurality of URS are multiplexing, and the field of indication URS mapped mode is indicated the call number of each layer employing orthogonal code.
11. method according to claim 1, wherein, adopt the frequency division multiplexing branch multiplex mode of raising the price to realize that a plurality of URS are multiplexing, and the field of indication URS mapped mode comprises first and second portion: first is the group indication bit, if multiplex mode is a frequency division multiplexing, then should the group indication bit indicate the multiplexing number of plies of URS, the branch of raising the price is multiplexing if multiplex mode is a frequency division multiplexing, then should group indication bit indication running time-frequency resource mapped mode and the orthogonal code sets of use, concrete URS multiplex mode is that frequency division multiplexing still is the frequency division multiplexing multiplexing expression that can pass through this group indication bit implicit expression of branchs of raising the price; Second portion if be frequency division multiplexing, is then indicated the call number of each layer employing URS mapped mode for index indication bit in the group, if for the frequency division multiplexing branch of raising the price multiplexing, the call number of the orthogonal code that adopted of this each layer of indication bit URS then.
12. a base station equipment comprises:
The combo unit is according to from the subscriber equipment feedack described a plurality of subscriber equipmenies being carried out combo;
Scheduling unit determines each subscriber equipment to transmit the number of plies of data and the URS mapped mode that pairing, a plurality of URS of each layer is re-used simultaneously;
Precoding unit is carried out precoding to URS and user data; And
Transmit-Receive Unit receives the number of plies of data by its employed URS mapped mode of signaled subscriber equipment and its, and gives subscriber equipment with URS after the precoding and user data transmission.
13. base station equipment according to claim 12, wherein, the precoding that described each layer data of precoding unit employing subscriber equipment is used is carried out preliminary treatment to the reference signaling of corresponding data layer, and pretreated reference signaling is mapped to on the pairing running time-frequency resource of the selected URS mapped mode of the corresponding data layer unit.
14. base station equipment according to claim 12 wherein, is distinguished the number of plies that subscriber equipment receives data by different descending control information formats.
15. base station equipment according to claim 12 wherein, adopts the frequency division multiplexing mode to realize that a plurality of URS are multiplexing, and the field of indication URS mapped mode comprises: first, the multiplexing number of plies of indication URS; And second portion, indicate the call number of each layer employing URS mapped mode.
16. base station equipment according to claim 15, wherein, adopt the frequency division multiplexing mode to realize that a plurality of URS are multiplexing, and the density that reduces the shared running time-frequency resource of each URS along with the increase of the multiplexing number of URS, with the signaling consumption that guarantees URS in the scope of appointment.
17. base station equipment according to claim 12 wherein, adopts the frequency division multiplexing mode to realize that a plurality of URS are multiplexing, and the field of indication URS mapped mode is indicated the call number of each layer employing URS mapped mode.
18. base station equipment according to claim 12 wherein, adopts the code division multiplexing mode to realize that a plurality of URS are multiplexing, and the field of indication URS mapped mode comprises: first, the orthogonal code sets of indication running time-frequency resource mapped mode and use thereof; And second portion, indicate the call number of the orthogonal code of each layer employing.
19. base station equipment according to claim 18, wherein, when multiplexing URS number increases, by increasing the performance that the running time-frequency resource unit that uses guarantees a plurality of URS code division multiplexings.
20. base station equipment according to claim 12 wherein, adopts the code division multiplexing mode to realize that a plurality of URS are multiplexing, and the field of indication URS mapped mode is indicated the call number of each layer employing orthogonal code.
21. base station equipment according to claim 12, wherein, adopt the frequency division multiplexing branch multiplex mode of raising the price to realize that a plurality of URS are multiplexing, and the field of indication URS mapped mode comprises first and second portion: first is the group indication bit, if multiplex mode is a frequency division multiplexing, then should the group indication bit indicate the multiplexing number of plies of URS, the branch of raising the price is multiplexing if multiplex mode is a frequency division multiplexing, then should group indication bit indication running time-frequency resource mapped mode and the orthogonal code sets of use, concrete URS multiplex mode is that frequency division multiplexing still is the frequency division multiplexing multiplexing expression that can pass through this group indication bit implicit expression of branchs of raising the price; Second portion if be frequency division multiplexing, is then indicated the call number of each layer employing URS mapped mode for index indication bit in the group, if for the frequency division multiplexing branch of raising the price multiplexing, the call number of the orthogonal code that adopted of this each layer of indication bit URS then.
22. a communication system comprises as the described base station equipment of one of claim 12～21, and user terminal, described user terminal carries out channel estimating according to the URS that receives, and utilizes the result of channel estimating that the user data that receives is carried out data demodulates.
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