CN104753575B - Method and apparatus for providing down link control information in mimo wireless communication system - Google Patents

Method and apparatus for providing down link control information in mimo wireless communication system Download PDF

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Publication number
CN104753575B
CN104753575B CN201510092417.XA CN201510092417A CN104753575B CN 104753575 B CN104753575 B CN 104753575B CN 201510092417 A CN201510092417 A CN 201510092417A CN 104753575 B CN104753575 B CN 104753575B
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layer
transmitting
information
mimo
down link
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CN104753575A (en
Inventor
高贤秀
郑载薰
任彬哲
李文
李文一
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LG Electronics Inc
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LG Electronics Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0665—Feed forward of transmit weights to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

The present invention relates to a kind of method, wherein, according to one embodiment of present invention, user equipment receives down link signal in the wireless communication system for supporting downlink mimo transmitting from base station, and this method includes：Down link control information is received, the down link control information includes being used for the information for the quantity N (1≤N≤8) for indicating the layer that one or two enabled code word of downlink mimo transmitting is mapped to；Each UE specific reference signals in the down link data and the N layers launched on each N layers are received based on the down link control information；And the down link data is decoded based on the UE specific reference signals, wherein, for indicating that the information of quantity of this layer can further comprise the information on the code for identifying the UE specific reference signals.

Description

For in mimo wireless communication system provide down link control information method and Equipment
The application be on July 23rd, 2012 international filing date submitted be on January 24th, 2011 Application No. 201180006914.3 (PCT/KR2011/000480's), it is entitled " to be used in mimo wireless communication system under providing The divisional application of the method and apparatus of downlink control information " patent application.
Technical field
The present invention relates to a kind of wireless communication system, and more particularly relate in multiple-input, multiple-output (MIMO) channel radio The method and apparatus that down link control information is provided in letter system.
Background technology
In mobile communication system, user equipment (UE) can be in the downlink from base station receive information, and upper To Base Transmitter information in line link.The information launched by UE or received includes data and various control information, and according to by UE launches or the type of information received and use use various physical channels.
Downlink channel can include downlink control channel, down-link data channel etc..Downlink controls Channel can include the control for being used for the resource allocation and transmitting form for limiting the signal launched by down-link data channel Signal.The control information launched by downlink control channel can be referred to as down link control information (DCI).Descending chain Road control channel can include various DCI formats, and DCI format can include downlink resource allocations information, uplink Road resource allocation information etc..
Meanwhile multiple-input, multiple-output (MIMO) scheme is suitable for up-link or downlink.MIMO scheme refers to using Two or more transmit/receive antennas in transmitter and/or receiver and spatially launch several data flows simultaneously To improve the technology of power system capacity.As the MIMO scheme using several transmitting antennas, transmitting diversity, space can be used multiple With, Wave beam forming etc..
If to downlink transmission application MIMO scheme, in order to exactly by downlink receiver (for example, UE) downlink transmission is performed, it is necessary to the DCI launched for downlink mimo.
The content of the invention
【Technical problem】
In traditional 3GPP LTE systems, in downlink transmission, most two code words, Ke Yizhi can be supported The transmitting (that is, the transmitting of maximum order 4) by most 4 layers is held, and it is possible to only support the transmitting of individual layer Wave beam forming to be used as ripple Beam forms scheme.The introducing of the system for providing the performance better than traditional 3GPP LTE is discussed.These systems can To support new MIMO scheme, such as layer beam is formed, the transmitting of maximum order 8 and based on the more of UE specific reference signals (RS) User MIMO.
In the case of using the downlink transmission of the new MIMO scheme different from traditional MIMO scheme, descending chain Road receiver can be because do not receive down link signal accurately according to the control information of previously defined DCI format.Therefore, Need to be designed to provide for for accurately launching in new downlink mimo launching technique and receiving down link signal The DCI format of required control information.It is therefore an object of the present invention to providing a kind of can provide new downlink mimo hair The method and apparatus for penetrating required down link control information.
By present invention solves the technical problem that be not limited to technical problem above, and the other technologies not described herein are asked Topic will be apparent for the those skilled in the art based on following explanation.
【Technical scheme】
The realization of the purpose of the present invention can be used to support downlink multiple-input, multiple-output (MIMO) transmitting by a kind of The method for receiving down link signal in wireless communication system from base station in user equipment (UE), methods described include：Under reception Downlink control information, the down link control information include being used for one or two that indicates the downlink mimo transmitting The quantity N (1≤N≤8) for the layer that individual enabled code word is mapped to information；Received based on the down link control information The down link data and the UE specific reference signals of the N layers launched on the N layers；And based on the specific ginsengs of the UE Signal is examined to demodulate the down link data, wherein, for indicating that the described information of quantity of the layer further comprises closing In the information of the code for identifying the UE specific reference signals.
According to another aspect of the present invention, there is provided one kind is used to support downlink multiple-input, multiple-output (MIMO) transmitting Wireless communication system in launch the method for down link signal to user equipment (UE) in base station, methods described includes：Transmitting Down link control information, the down link control information include being used for one that indicates downlink mimo transmitting or The quantity N (1≤N≤8) for the layer that two enabled code words are mapped to information；And controlled and believed based on the downlink The down link data and the UE specific reference signals of the N layers that breath transmitting is launched on the N layers, wherein, the UE is based on The UE specific reference signals demodulate the down link data, wherein, for indicating that the information of quantity of the layer enters one Step includes the information on the code for identifying the UE specific reference signals.
According to another aspect of the present invention, there is provided a kind of user equipment (UE), it is used to support that downlink is more Include in the wireless communication system for entering to have more (MIMO) transmitting from base station reception down link signal, the UE：Receiving module, its It is configured to receive down link control information and down link data from the base station；Transmitter module, it is configured to institute State Base Transmitter uplink control information and uplink data；And processor, it, which is configured to control, includes described connect The UE of module and the transmitter module is received, wherein, the processor receives the downlink by the receiving module and controlled Information, the down link control information include being used for one or two the enabled generation for indicating the downlink mimo transmitting The quantity N (1≤N≤8) for the layer that code word is mapped to information；The processor is based on described descending by the receiving module Link control message receives the UE specific reference signals of the down link data launched on the N layers and the N layers, Yi Jiji The down link data is demodulated in the UE specific reference signals, and wherein, the letter of the quantity for indicating the layer Breath further comprises the information on the code for identifying the UE specific reference signals.
According to another aspect of the present invention, there is provided a kind of base station, it is used to support downlink multiple-input, multiple-output (MIMO) down link signal is launched to user equipment (UE) in the wireless communication system of transmitting, the base station includes：Receive mould Block, its be configured to from UE receive up-link control to and uplink data；Transmitter module, it is configured to the UE Launch down link control information and down link data；And processor, it, which is configured to control, includes the receiving module With the base station of the transmitter module, wherein, the processor by the transmitter module launch down link control information, The down link control information includes being used for one or two the enabled code word for indicating the downlink mimo transmitting The quantity N (1≤N≤8) for the layer being mapped to information, and the processor by the transmitter module be based on it is described descending The down link data and the UE specific reference signals of the N layers that link control message transmitting is launched on the N layers, wherein, The UE demodulates the down link data based on the UE specific reference signals, and wherein, for indicating the layer The information of quantity further comprises the information on the code for identifying the UE specific reference signals.
In the embodiment of the present invention, only when a code word is mapped to one layer and when two code word quilts When being mapped to two layers, it can include in the described information of the quantity for indicating the layer on for identifying that the UE is specific The described information of the code of reference signal.
In the embodiment of the present invention, on for identifying described in the code of the UE specific reference signals Information can distinguish the UE specific reference signals in the transmitting of same resource element opening position.
In the embodiment of the present invention, the same resource element position can be included in a reference signal group Four different UE specific reference signals of place's transmitting are put, and can be by for identifying the UE specific reference signals The described information of the code one reference signal group is divided into two subgroups, and a subgroup can include by orthogonal Two UE specific reference signals of code division.
In the embodiment of the present invention, the down link control information may further include described for indicating The information of the antenna port of downlink mimo transmitting.
In the embodiment of the present invention, for indicating that the described information of quantity of the layer can have 3 bits.
General remark and following detailed description above the present invention are exemplary, and are intended to describe right in addition It is required that.
【Beneficial effect】
According to the present invention it is possible to provide a kind of control information for being used to provide downlink transmission in a wireless communication system Method and apparatus, the transmitting of maximum order 8, layer beam formed, multiuser MIMO based on UE specific reference signals etc. is answered Use the wireless communication system.
The effect of the present invention is not limited to above-mentioned aspect, and other effects not described herein are for based on following explanation Those skilled in the art will be apparent.
Brief description of the drawings
Accompanying drawing is included to further understand the present invention, and is merged in the application and forms one of the application Point, accompanying drawing diagram embodiments of the invention, and for explaining principle of the invention together with specification.
Fig. 1 is the radio frame for showing to use in third generation partner program Long Term Evolution (3GPP LTE) system The figure of structure.
Fig. 2 is the figure for the resource grid for showing downlink time slots.
Fig. 3 is the figure for the structure for showing downlink subframe.
Fig. 4 is the figure for the structure for showing uplink sub-frames.
Fig. 5 is the block diagram for showing MIMO emitting structurals.
Fig. 6 is the figure for showing the mapping relations in MIMO emitting structurals between layer and physical antenna.
Fig. 7 is the figure for the reference signal mode being shown in 3GPP LTE systems.
Fig. 8 and 9 is the figure for illustrating demodulated reference signal (DMRS) pattern.
Figure 10 is diagram transmitting according to embodiments of the present invention and receives the figure of the method for down link signal.
Figure 11 is to show the figure according to the base station of the exemplary embodiment of the present invention and UE configuration.
Embodiment
The following examples are proposed by combining component parts and the characteristic of the present invention according to predetermined format.Should not have Have and regard independent component parts or characteristic optionally as under conditions of other remarks.If it is required, then can not be by independently Component parts or characteristic and miscellaneous part or property combination.Furthermore, it is possible to by some component parts and/or property combination with reality Existing embodiments of the invention.Can change will disclosed operation in an embodiment of the present invention order.The one of any embodiment A little parts or characteristic may also be included in that in other embodiment, or can be replaced by when necessary other embodiment that A bit.
Based on the data communications context between base station and user equipment (UE) come open embodiments of the invention.In the feelings Under condition, base station is used as the terminal node of network, and via the network, base station directly can be communicated with terminal.Can also The concrete operations to be carried out by base station in the present invention are carried out by the upper node of base station when necessary.
In other words, it is obvious for those skilled in the art, other networks by base station or in addition to base station Node is carried out for enabling base station to be led in the network being made up of several network nodes including base station with terminal The various operations of letter.Term " base station (BS) " can be replaced by term fixed station, node B, e node-b (eNB) when necessary Or access point.In this manual, term " base station " can include cell or sector.Term " relaying " could alternatively be in term After node (RN) or relay station (RS).Term " terminal " can also be replaced by terms user equipment (UE), movement when necessary Stand (MS), mobile subscriber station (MSS) or subscriber station (SS).
In the present invention, downlink transmitter can be base station or repeater (if under repeater accesses to UE transmittings Line link), and downlink receiver can be UE or repeater (if repeater receives backhaul downlink from base station). In the following description, although under base station is typically described as into downlink transmitter and is typically described as UE Uplink receiver, but the invention is not restricted to this, and can be applied to any downlink transmitter and receiver.
It should be noted that for convenience of description and more fully understanding the present invention, it is proposed that specific art disclosed in the present invention Language, and the use of these particular terms can not be changed into another form in the technical scope of the present invention or spirit.
In some cases, construction and device known to omission, so as to idea of the invention of avoiding confusion, and with block diagram Form shows the critical function of construction and device.It will pass through accompanying drawing and use identical drawing reference numeral, it is same or analogous to indicate Part.
By supporting this hair at least one disclosed normative document of the wireless access system including following part Bright exemplary embodiment：The system of IEEE (IEEE) 802, third generation partner program (3GPP) system System, 3GPP Long Term Evolutions (LTE) system and 3GPP2 systems.Specifically, file above can support the implementation in the present invention Example in, do not describe with clearly disclose the present invention technological thought the step of or part.All terms as used herein can be with By at least one support of above-mentioned file.
Following technology can be applied to a variety of wireless access technologys, for example, CDMA (CDMA), FDMA (frequency divisions Multiple access), TDMA (time division multiple acess), OFDMA (OFDM) and SC-FDMA (single-carrier frequency division multiple access) etc..CDMA can be with It is embodied as wireless (or radio) technology, such as UTRA (universal terrestrial radio access) or CDMA2000.It can use all Wireless (or radio) technology such as following part embodies TDMA：GSM (global system for mobile communications)/GPRS (general packet without Line electric industry is engaged in)/EDGE (enhanced data rates for gsm evolution).Wireless (or radio) skill of such as following part can be used Art embodies OFDMA：IEEE (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20 and E-UTRA (evolution UTRA).UTRA is a part for UMTS (Universal Mobile Telecommunications System).3GPP (third generation cooperations Partnership Program) LTE (Long Term Evolution) be using E-UTRA E-UMTS (evolution UMTS) a part.3GPP LTE are in descending chain OFDMA is used in road, and uses SC-FDMA in the uplink.Advanced LTE (LTE-A) is 3GPP LTE evolution version. IEEE 802.16e (WirelessMAN-OFDMA frames of reference) and advanced IEEE 802.16m can be passed through (WirelessMAN-OFDMA advanced systems) describes WiMAX.For clarity, following description focus on 3GPP LTE and LTE-A.However, the technical spirit not limited to this of the present invention.
Fig. 1 is the structure of radio frame for showing to use in third generation affiliate Long Term Evolution (3GPP LTE) system Figure.One descending chain circuit frame includes 10 subframes, and a subframe includes two time slots in the time domain.For launching one Time needed for subframe is referred to as transmission time interval (TTI).For example, a subframe can have 1ms length, and one Time slot can have 0.5ms length.One time slot can include multiple OFDM symbols in the time domain.In 3GPP LTE systems In, because using OFDMA schemes in the downlink, OFDM symbol indicates a symbol period.One symbol can be It is referred to as SC-FDMA symbols or symbol period in up-link.Resource block (RB) is resource allocation unit, and in a time slot Include multiple continuous subcarriers.The structure of radio frame is only exemplary.Therefore, can change in a variety of ways The quantity for the subframe that radio frame includes, the quantity of the time slot included in subframe or the OFDM symbol that includes in a slot Quantity.
Fig. 2 is the figure for the resource grid for showing downlink time slots.One downlink time slots includes 7 in the time domain OFDM symbol, and a RB includes 12 subcarriers in a frequency domain, and the invention is not restricted to this.For example, a time slot is usual Cyclic prefix (CP) include 7 OFDM symbols, and a time slot includes 6 OFDM symbols in the CP of extension.Resource Each element of grid is referred to as resource element (RE).One RB includes 12 × 7 RE.Based on downlink transmission bandwidth come really It is scheduled on the quantity N for the RB that downlink time slots includeDL.The construction of uplink time slot can be equal to the structure of downlink time slots Make.
Fig. 3 is the figure for the structure for showing downlink subframe.Anterior most three of the first time slot in a subframe Individual OFDM symbol corresponds to the control area that control channel is assigned to.Remaining OFDM symbol is total to corresponding to physical down link Enjoy the data area that channel (PDSCH) is assigned to.The example of the downlink control channel used in 3GPP LTE systems Including such as physical control format indicator channel (PCFICH), physical downlink control channel (PDCCH), physical mixed certainly Dynamic repetitive requests indicator channel (PHICH) etc..PCFICH is launched at the first OFDM symbol of subframe, and including on Information for the quantity of the OFDM symbol of emission control channel in subframe.PHICH includes launching as up-link Response HARQ ack/nack signals.Down link control information (DCI) is referred to as by the PDCCH control information launched.
DCI includes up-link or downlink schedule information or the up-link transmission power for particular UE group controls Order.PDCCH can include the resource allocation and the shared letter of transmitting form, up-link of downlink sharied signal channel (DL-SCH) The resource allocation information in road (UL-SCH), the paging information of PCH (PCH), the system information on DL-SCH, such as exist The resource allocation of the higher level control message for the accidental access response (RAR) launched on PDSCH, for only in particular UE group The startup etc. of vertical UE one group of emissive power control command, transmission power control information, voice over internet protocol (VoIP).One The collection of individual or several continuous control element in channel (CCE) closes transmitting PDCCH.CCE is for the shape based on radio channel The compiling rate of state provides PDCCH logical allocation unit.CCE corresponds to multiple resource element groups.Based on CCE quantity and The quantity of PDCCH form and available bits is determined by the correlation between the compiling rate of CCE offers.Base station is according to will be to end The DCI of transmitting is held to determine PDCCH forms, and adheres to CRC (CRC) to control information.According to gathering around for PDCCH The person of having or using come use radio net temporary identifiers (RNTI) shelter CRC.If PDCCH is used for particular terminal, can To shelter the cell-RNTI (C-RNTI) of terminal for CRC.Alternatively, can be right if PDCCH is used for beep-page message In CRC masking Paging Indicator identifiers (P-RNTI).If PDCCH is used for system information (more specifically, system information block (SIB)), then can be for CRC masking systems information identifier and system information RNTI (SI-RNTI).In order to indicate as pair In the accidental access response of the response of the transmitting of the random access guiding of terminal, Stochastic accessing RNTI can be sheltered for CRC (RA-RNTI)。
Multiple PDCCH can be launched in control area.UE can monitor the multiple PDCCH.Monitoring instruction UE attempts PDCCH is decoded according to DCI format.In the control area distributed in subframe, base station does not provide what is located on PDCCH to UE The information at place.UE monitors one group of PDCCH candidate in subframe, and finds its PDCCH.This is referred to as blind decoding.For example, If UE is not detected by crc error, PDCCH of the UE detections with its DCI by its C-RNTI of demasking in PDCCH. UE can be configured to according to various emission modes receive via PDCCH transmission PDSCH data launch, and can via compared with High-level signaling semi-statically specifies such setting.
Fig. 4 is the figure for the structure for showing uplink sub-frames.Uplink sub-frames can be divided into control in a frequency domain Region and data area.Include the physical uplink control channel of uplink control information to control area distribution (PUCCH).Include the physical uplink link shared channels (PUSCH) of user data to data area distribution.In order to keep single load Wave property, PUCCH and PUSCH is launched during a UE difference.It is used for UE's to distributing to a RB in subframe PUCCH.Belong to RB couples of RB relative to the different subcarrier of two Time Slot Occupancies.Therefore, to PUCCH distribute RB in time slot Edge " by frequency hopping ".
The data slice that mimo system is received using collecting independent of individual antenna path via several antennas is to connect Receive the technology of a message.According to MIMO technology, because improving data emissivity or can be relative to specific in particular range Data emissivity increases system scope, so MIMO technology can be widely used in mobile communication UE and repeater.MIMO It can be multi-antenna technology.
Multiple independences can be divided into according to the mimo channel matrix of the quantity of reception antenna and the quantity of transmitting antenna Channel.Each independent channel is referred to as layer or stream.Order can be with expression layer or the quantity of stream.In the following description, sent out in MIMO Hit, " order " instruction can the individually path of transmission signal quantity, and " quantity of layer " instruction is sent out by each path The quantity for the signal stream penetrated.Typically, since transmitter transmitting quantitatively corresponds to the layer of the quantity for the order for being used for signal transmitting, So order has the quantity identical implication with layer, unless otherwise indicated.
As the MIMO scheme using several transmitting antennas, transmitting diversity, spatial reuse, Wave beam forming etc. can be used.
Emission diversity scheme has the advantage that：By launching identical data message via several transmitting antennas to realize that height can Launch by degrees of data, without receiving the feedback information associated with channel from receiver.
Using Wave beam forming come by the way that several transmitting antennas are multiplied by into appropriate weighting to improve the signal of receiver with doing Disturb plus noise ratio (SINR).Typically, since uplink/downlink channel be in frequency division duplex system it is independent and because This needs high-reliability channel information to obtain appropriate Wave beam forming gain, it is possible to is received from receiver independent anti- Feedback, so as to using Wave beam forming.
Spatial multiplex scheme can be divided into single user spatial multiplex scheme and Multi-User Dimension multiplexing scheme.Single user Spatial multiplex scheme is referred to as spatial reuse (SM) scheme or SU-MIMO schemes, and it distributes the more of base station to a user (UE) Individual antenna resources.Proportionally increase mimo channel capacity with the quantity of antenna.Multi-User Dimension multiplexing scheme is referred to as space division Multiple access (SDMA) scheme or MU-MIMO schemes, its multiple antenna resources or wireless space to multiple users (UE) distributed base station Resource.
In the case of using MIMO scheme, exist：Single code word (SCW) scheme, it is used to compile using a channel Code block launches N number of data flow simultaneously；And multiple codeword (MCS) scheme, it is used to use M (M is always less than or equal to N) Individual channel coding blocks launch N number of data flow.Now, each channel coding blocks produce independent code word, and each code Word can be designed to enabled independent error detection.
Traditional mimo system is designed based on MCW structures.In MCW structures, it is allowed to while launch most two codes Word.For MIMO transmittings, it is necessary to the modulation used by transmitter and compilation scheme (MCS) information, the data for indicating transmitting Whether it is the new data indicator (NDI) of new data or the data of repeating transmission and for indicating which is retransmitted in the case of repeating transmission Redundancy versions (RV) information of individual subgroup etc..
Fig. 5 is the block diagram for showing MIMO emitting structurals.In the system for supporting MIMO scheme, transmitter can launch one Or multiple code words.By the codeword mappings to the transmission block from higher level being described below.Fig. 5 shows to support The system of most two code words.By one or more code word processings can be multiple by scrambling module and modulation mapper Close symbol.Thereafter, composite symbol is mapped to by multiple layers by layer mapper, and it is pre- by being distributed to each transmitting antenna Every layer is multiplied by the predetermined pre-coding matrix selected according to channel status by coding module.It will can be led to by resource element mapper The signal for crossing each antenna transmitting is mapped to the temporal frequency resource element that be used for transmitting, and passes through ofdm signal generator Launch the signal with antenna.
Transmission block will now be described to codeword mappings relation.In Figure 5, will according to transmission block to codeword mappings rule Two transmission blocks (TB) are mapped to two code words.If enabling two TB, can be exchanged according to TB to CW exchange labelings TB is to codeword mappings.TB can be configured as shown in tables 1 and 2 to CW mapping rulers.
Table 1
TB is to CW exchange labeling values CW 0 (enabled) CW 1 (enabled)
0 TB 1 TB 2
1 TB 2 TB 1
Table 2
TB 1 TB 2 CW 0 (enabled) CW 1 (enabled)
It is enabled Forbid TB 1 -
Forbid It is enabled TB 2 -
Table 1 shows the TB when enabling two TB to the example of CW mapping rulers, and table 2 shows to work as and enables a TB simultaneously And TB when forbidding another is to the example of CW mapping rulers.
The situation forbidden including wherein TB size and be 0 of TB in table 2.Do not reflected if TB size is 0, TB It is mapped to CW.
If carrying out transmission signal using individual antenna, a code word is mapped to one layer and is launched.However, such as Fruit carrys out transmission signal using multiple antennas, then according to launch scenario, restricted code word is to layer mapping ruler as shown in table 3 and 4.
Table 3
Table 4
Table 3 is shown wherein to carry out the example of transmission signal using method for spacial multiplex, and table 4 is shown wherein using transmitting point Diversity method carrys out the example of transmission signal.In table 3 and 4, x(a)(i) i-th of symbol of layer of the instruction with index a, and d(a) (i) i-th of symbol of code word of the instruction with index a.The project " quantity of layer " and project " code of table 3 and 4 can be passed through The quantity of word " confirms the mapping relations between the quantity in code word and the quantity of the layer for transmitting, and project " code Word to layer mapping " indicate how respectively to layer map code word symbol.
It can find out from table 3 and 4, although can send out a codeword mappings to one layer and in units of symbol Penetrate, but a code word can be distributed and be mapped to most 4 layers, as in the second situation of table 4.
The mapping relations between layer and physical antenna will be described with reference to Figure 6.Following explanation is exemplary, and Mapping relations between layer and physical antenna can be arbitrary.In the following description, it is assumed that support MIMO scheme is System has such as four physics transmitting antennas.If order is 1, a code word CW1 is mapped to one layer, and can use Method for precoding come encode by one layer foundation data, be launched with will pass through four transmitting antennas.If order is 2, two Code word CW1 and CW2 are mapped to two layers, and are mapped to four transmitting antennas using precoder.If order is 3, A code word CW1 in two code words is mapped to one layer by serial parallel (S/P) converter, and by another Code word CW2 is mapped to two layers.That is, two codeword mappings to three layers and four hairs will be mapped to altogether using precoder Penetrate antenna.If order is 4, S/P converters use being each mapped to two layers in two code words CW1 and CW2 pre- Encoder will altogether four layers be mapped to four transmitting antennas.
Although the base station with four transmitting antennas can be with most four layers and four independent code words, Fig. 6 Such as show wherein code word quantity be up to 2 system.As set forth above, it is possible to change by two code word CW1 and The position of the information of CW2 transmittings.
Meanwhile precoder will usually be expressed by Mt (quantity of transmitting antenna) * v (spatial reuse speed), and And according to circumstances adaptively use pre-coding matrix using by one group of predetermined matrix of emitter/receiver.This group prelists Code matrix is referred to as code book.
In traditional 3GPP LTE systems, the logical antenna ports of four or more can be used (for example, antenna port 0 to 5).Antenna port is not distinguished physically, and by manufacturer carries out which thing be mapped on logical antenna index Manage the determination of antenna index.Antenna port and physical antenna can not correspond to each other one to one, and an antenna port can Using the aerial array of the combination corresponding to a physical antenna or as multiple physical antennas.
In 3GPP LTE systems, as downlink reference signal, three reference signals can be used, it includes cell Specific reference signals (it is not associated with MBSFN transmittings), MBSFN reference signals and the UE associated with MBSFN transmittings are specific Reference signal.
Cell specific reference signal is used as sequence caused by initial value using using the cell ID of each cell, and can To launch cell specific reference signal using antenna port 0 to 3.MBSFN reference signals, which are used to obtain, is used for MBSFN transmittings Downlink channel information, and be launched via antenna port 4.
UE specific reference signals are supported in individual antenna port transmitting for PDSCH, and can be via antenna port 5 Launch UE specific reference signals.Terminal (UE) can receive special on such UE from higher level (MAC layer or higher level) Determine the information whether reference signal is used for PDSCH demodulation.UE specific reference signals enable the wave beam of the data transmitting to particular UE Formed.For example, base station can be produced to particular UE using the array (antenna port) of the physical antenna of adjacent positioned Directional transmissions.The phase of the signal of different physical antennas is suitably arranged and combined in UE opening position.UE is fixed by as The transmitting using an antenna is identified as to transmitting.Because experienced by the wave beam of Wave beam forming between base station and UE not Cochannel responds, so needing to use UE specific reference signals so that UE can accurately demodulate the data of Wave beam forming.
Above-mentioned UE specific reference signals correspond to DRS (Dedicated Reference Signal) (DRS) or the demodulated reference signal of precoding (DMRS).In the case of using precoding reference signal, transmitting quantitatively corresponds to the reference signal of spatial multiplex ratio.
UE specific reference signals can be used for individual layer Wave beam forming (Wave beam forming of the transmitting of order 1).As described above, because By with the precoder identical precoder to the data application on PDSCH come precoding UE specific reference signals, so Pre-coding matrix is transparent for UE.That is, in the case of the transmitting using UE specific reference signals, because the channel of estimation includes Precoding weights, it is possible to individual layer Wave beam forming is realized, and without using precoding information.Therefore, believed by not including precoding The DCI format of the control signal information structure of breath can be used for individual layer Wave beam forming.For example, for individual layer Wave beam forming, upper In the DCI format stated, the DCI format 1 or DCI format limited for the transmitting of individual antenna port and transmitting diversity can be used 1A。
Because only by antenna port 5 be defined as in traditional 3GPP LTE (version -8) system be used for launch UE with particular reference to The antenna port of signal, if so order two or more, must be sent out using cell specific reference signal (antenna port 0 to 3) Penetrate data.That is, each UE can use the precoding weighted information obtained via control channel and believe via cell specific reference Number obtain channel information come perform data demodulation.
Recently, in 3GPP LTE versions -9, the introducing that layer beam forms (or double-current Wave beam forming) has been discussed. Layer beam forms the MIMO launch scenarios for the transmitting for representing to support the maximum order 2 based on UE specific reference signals, and correspondingly In the extension of individual layer Wave beam forming.Being formed according to layer beam, two enabled TB of maximum are respectively mapped to two code words, And it is launched via two layers, and every layer of transmitting DRS.Formed according to layer beam, even if when base station does not notify to each UE During precoding information, the channel information that UE can use the UE specific reference signals via every layer of transmitting to obtain to receive from base station MIMO launches, without multi-user interference.
Double-deck ripple can be designed for using time division multiplexing (TDM)/frequency division multiplexing (FDM)/code division multiplexing (CDM) scheme The DRS that beam is formed so that layer is orthogonal.If performing transmitting using only individual layer, to UE notices in the special of two layers of support With in reference signal be used for perform individual layer launch reference signal corresponding with layer, to improve data demodulation performance.Therefore, need Bit field is wanted, for indicating the reference signal for individual layer Wave beam forming in down link control information.
In addition, in layer beam is formed, it can launch via two layers or individual layer and receive data.Sent out via two layers The situation for penetrating different code words corresponds to MCW SU-MIMO.In the case of the transmitting using individual layer, SU- can be performed MIMO or MU-MIMO.The situation for launching data to a user using individual layer corresponds to SU-MIMO.Distributed to different users Two layers of situation corresponds to MU-MIMO.In the case of MU-MIMO, because each UE can be used via UE with particular reference to letter Number obtain channel information carry out separating layer, so base station can be provided for indicate that the information of layer corresponding with each UE so that UE obtains channel.As described above, in layer beam formation scheme, because using most two layers, base station needs 1 bit letter Cease to indicate one of two layers.
As the control signal that transmitting is formed for SU-MIMO layer beams, DCI format 2A can be used.Meanwhile should It is determined that support the MU-MIMO DCI format formed based on layer beam.Formed according to SU-MIMO layer beams and MU-MIMO is moved State switching support, preferably limit for SU-MIMO and MU-MIMO layer beams formed transmitting a DCI format so as to Distinguished in DCI format between SU-MIMO and MU-MIMO.
The operation of the system of 3GPP LTE versions -9 can be defined to be included in the operation of the system of version -10.That is, exist The layer beam limited in 3GPP LTE versions -9, which forms transmitting operation, to be needed to be performed with being defined as no any problem, i.e., Make in the system of 3GPP LTE versions -10.The expense of the DRS patterns of the system of 3GPP LTE versions -10 is changed according to transmitting order (that is, the quantity for wherein launching DRS down-chain resource element).In the system of 3GPP LTE versions -10, such as DRS patterns It is designed such that and equally keeps DRS expenses from order 1 to order 2, compared with the DRS expenses of order 1 to order 2, order 3 or more Big DRS expenses increase, also, DRS expenses order 3 into order 8 it is identical.Alternatively, DRS patterns can be designed and causes DRS Expense is identical from order 1 to order 4, and the DRS expenses of order 5 or bigger increase compared with the DRS expenses of order 1 to order 4, and DRS is opened Pin order 5 into order 8 it is identical.In the system of 3GPP LTE versions -9, design layer beam is formed with maximum order 2, and In MU-MIMO schemes, one layer is distributed to each UE.Now, in MU-MIMO operation, the DRS of order 2 can be kept to open Pin.Meanwhile in the system of 3GPP LTE versions -10, because supporting the transmitting of maximum order 8, it is possible to when application MU-MIMO is sent out When penetrating the layer of 8 or more is distributed to each UE.Therefore, in the case of the transmitting of maximum order 8, should to UE notify on Transmitting information of the sum of ranks to each UE layers distributed of total transmitting order, each UE in transmitting, to accurately carry out MU- MIMO。
The DRS patterns of 3GPP LTE versions -9 can be made up of the subset of the DRS patterns of version -10, also, in version -9 The emission mode of middle restriction can be defined as one of emission mode limited in version -10.In such a case it is possible to configure It is only used for the DCI format that the layer beam of version -9 is formed.Hereinafter, description is supported in the emission mode of version -9 simultaneously The design of SU-MIMO and MU-MIMO DCI format.
The bit field collocation method of DCI format
Hereinafter, it will describe to be used for the field that is limited in existing DCI format of new interpretation so as to supported bilayer Wave beam forming Embodiments of the invention.In existing 3GPP LTE standards (for example, 3GPP LTE versions -8), limit DCI format 0,1, 1A, 1B, 1C, 1D, 2,2A, 3 and 3A.In brief, DCI format 0 is used for uplink resource allocation information, DCI format 1 to 2 For downlink resource allocations information, and DCI format 3 and 3A are used for the up-link transmission power control of any UE groups (TPC) order.
The DCI format 2A limited in existing 3GPP LTE standards (version -8) is shown in table 5.
Table 5
DCI format 2A
DCI format 2A corresponds to the control information form for being used for the transmitting of 2 code word Open-Loop Spatial Multiplexing.Open-Loop Spatial Multiplexing Transmitting represents to realize spatial reuse transmitting without the feedback from UE.Therefore, it is related pre- using non-channel in open loop policy Coding.
Emission mode can semi-statically be changed by higher level signaling.If emission mode is defined to layer beam Formed, then DCI format 2A bit field can be construed to the control information with launching for Open-Loop Spatial Multiplexing by UE Different implications.
DCI format 2A supports maximum two code words (transmission block), and relative to each transmission block limit MCS, NDI and RV.As described above, MCS is on the modulation used by transmitter and the information of compilation scheme, NDI is indicated for the number of transmitting According to whether be new data or the data of repeating transmission new data indicator, also, RV is indicated for the weight in the case of repeating transmission The redundancy version information of which subgroup sent out.
The 2 of the MCS that can be made up of modulation order and transport block size expression N-bitNIndividual field.Some fields are used for The MCS for data transmitting is indicated, and some fields only express the modulation order that can be used when retransmitting.In addition, some words Section instruction transport block size " 0 ", this expression do not perform data transmitting.If it is indicated that the MCS words with transport block size " 0 " (zero) Transmission block is forbidden in section, then this expression.Alternatively, if it is indicated that the MCS fields with non-zero transport block size, then this expression make Can transmission block.
TB indicates whether that the mapping relations between two TB and two CW, such as reference table can be exchanged to CW exchange labelings Described in 1.
The precoding information limited in DCI format 2A provides the information on launching order.Precoding information is using 2 It is arranged to 0 bit (that is, in the absence of precoding information) in the case of the transmitting of antenna port, and is using 4 antenna ends It is arranged to 2 bits in the case of the transmitting of mouth.The precoding information field of four antenna ports can be limited as shown in table 6 Content.
Table 6
In DCI format 2A, transmitting diversity transmitting (if enabling a code word) is performed in the case of order 1, and The spatial reuse transmitting with two code words is performed in the case of order 2.Can be determined as shown in table 7 and 8 according to order To apply the method for transmitting diversity or spatial reuse.
Table 7
Table 8
Table 7 shows wherein to enable any one TB situation, and table 8 shows wherein to enable two TB situation.In table 7 In the case of do not need TB to CW exchange labelings, still, TB is needed in the case of table 8 to code word exchange labeling, so as to true Which CW fixed two TB are respectively mapped to.
Order can explicitly or implicitly be indicated.Can be bright to establish using the method for limiting independent order designator True order instruction.
UE can obtain rank information using implicit methods, and be not provided with order designator.Can by TB MCS information and RV indicates enable/forbidding for TB.In DCI format 2A, if for example, TB MCS index values are arranged into 0 to indicate Transport block size is 0, then does not perform and launch and therefore forbid TB.If transport block size is not 0, can indicate to enable TB.Alternatively, if MCS index values, which are arranged to 0 and RV, is arranged to 1, it can indicate that TB is prohibited, and it is no Then, it can indicate that TB is enabled.Therefore, UE impliedly confirms to perform the transmitting of order 2 if two TB are enabled, and if makes A TB and another TB can be forbidden then to perform the transmitting of order 1.
According to the definition of existing DCI 2A forms, if only enabling a TB, retain TB to CW exchange labelings, and because This, TB is construed to CW exchange labelings have different implications.
For example, in the case of the transmitting of order 1, DCI format 2A TB to CW exchange labelings is used as indicating For individual layer Wave beam forming TB, CW or layer index information.
Alternatively, TB to CW exchange labelings can be used to indicate whether in 3GPP LTE versions -9 and version 10 Change the designator of DRS expenses in the DRS of middle restriction use.For example, increase wherein compared with the DRS expenses of version -9 In the case of the DRS expenses of 3GPP LTE versions -10, some resource elements (RE) for the DRS being not used in version -9 should Launch for RS.If however, the unidentified situations of version -9UE, version -9UE explains that transmitting is in addition to RS on RE Information (for example, data), and can inaccurately receive down link signal.Therefore, if using TB to CW exchange labelings to UE notifies DRS expenses, then version -9UE can identify that the RE positions for wherein launching the RS limited in version -10 are empty RW, And accurately receive down link signal.
Alternatively, in the case of the transmitting of order 1, TB to CW exchange labelings is used as indicating the hair of order 1 Whether be individual layer Wave beam forming transmitting or transmitting diversity is launched if penetrating mark.
Hereinafter, in addition to above-mentioned agreement, bit field for new interpretation DCI format 2A will be described in further detail Each embodiment of the present invention.
Embodiment 1
One embodiment of the present of invention of some bit fields for new interpretation DCI format 2A will now be described.
In the following embodiments, (that is, TB MCS value and/or RV can be passed through by clear and definite signaling or impliedly It is worth) whether only enable a TB to UE notices.
In embodiment 1-1, TB to CW exchange labelings is used as code word designator.
According to the definition of existing DCI 2A forms, if only enabling a TB, retain TB to CW exchange labelings, and will TB 1 and TB 2 is mapped to code word 0 (referring to table 2).In the present embodiment, it is proposed that use TB if enabled only one TB It is used as the method for the designator for the code word that a TB is mapped to CW exchange labelings.Marked i.e., it is possible to which TB to CW is exchanged Note is re-used as the information of the index for indicating the code word for individual layer Wave beam forming.
According to the present embodiment, if only enabling a TB, TB is not retained to CW exchange labelings, and be set to 1 Bit value.If it is the first value only to enable a TB and the logical value of exchange labeling, TB 1 is solved as only enabled TB 1 It is interpreted as being mapped as code word 0, and as only enabled TB 2, TB 2 is construed to be mapped to code word 1.It is if only enabled The logical value of one TB and exchange labeling is second value, then is construed to be mapped as code word by TB 1 as only enabled TB 1 1, and as only enabled TB 2, TB 2 is construed to be mapped to code word 0.
First logical value of exchange labeling can correspond to 0 or close, and the second logical value of exchange labeling can correspond to In 1 or opening.First and second logical values can be 1/0 or ON/OFF, but the invention is not restricted to this.I.e., alternatively, first Logical value can correspond to 1 or open, and the second logical value can correspond to 0 or close.
In the embodiment below the present invention, the implication of the first or second logical value is equally applicable to other bits Field.That is, the specific bit field with the first or second logical value represents logic of the bit field with 1/0 or ON/OFF Value.
Table 9 and 10 shows embodiment 1-1 TB to CW mapping relations.
Table 9
Table 10
In embodiment 1-2, TB to CW exchange labelings is used as code word designator.
According to the present embodiment, if only enabling a TB, do not retain TB to CW exchange labelings, and TB to CW is exchanged Mark is arranged to 1 bit value.If the logical value for only enabling a TB and exchange labeling is the first value (0 or pass), will make The TB of energy is construed to be mapped to code word 0.If the logical value for only enabling a TB and exchange labeling be second value (1 or Open), then enabled TB is construed to be mapped to code word 1.Table 11 and 12 shows embodiment 1-2 TB to CW mapping relations.
Table 11
Table 12
In embodiment 1-3, TB to CW exchange labelings is used as level indicator.
According to the present embodiment, in the case of only enabling a TB wherein and forbidding another TB, if UE can be The logical value of exchange labeling is to explain the channel information for obtaining first layer in the case of the first value (0 or close), and if The logical value of exchange labeling is to explain the channel information for obtaining the second layer in the case of second value (1 or open).
Although describing the situation for wherein performing transmitting using emission diversity scheme when only forbidding a code word, It is to apply based on 2 layers of emission diversity scheme.UE obtains the information on two channels from the DRS via every layer of transmitting. In this case, code word can follow the mapping relations of table 4 to layer mapping relations.
Embodiment 1-4 is related to a kind of TB for reusing and forbidding new data indicator (NDI) or redundancy versions (RV) The method of field.
As described above, in DCI format 2A, MCS fields, NDI fields and RV fields are limited relative to TB.If enabled one Individual TB and forbid another TB, then can be by the TB forbidden NDI fields or RV fields for other purposes.If TB's MCS index values are 0 or value is 1 if MCS index values are 0 and RV, then TB can be configured to forbid, as described above.
Because using most two layers in layer beam formation scheme, then base station can use 1 bit field of DCI information Indicate one layer or antenna port for single antenna port transmitting between the two layers.For example, as shown in table 13, for launching Layer be first layer in the case where if the TB forbidden NDI values are the first value (or 0), and if the TB's forbidden It in the case of second value (or 1) is the second layer that NDI values, which are,.
Table 13
Meanwhile substitute the NDI fields using the TB forbidden, marker can be carried out using RV fields.If when TB MCS ropes Draw and forbid TB when value is 1, then if the TB forbidden RV fields are the first value (or 0), then can indicate first layer, and if RV fields are second value (or 1), then can indicate the second layer.
In embodiment 1-4-1, it can indicate what enabled TB was mapped to by the TB forbidden NDI or RV fields Layer numbering (or index).As described in reference table 5, DCI format 2A NDI fields have the size of 1 bit, and RV fields have The size of 2 bits.Therefore, it is possible to use all or some of the NDI associated for the TB with forbidding and RV 3 bits altogether To indicate the layer for transmitting.
For example, in the launch scenario for supporting most two orders, use two layers.In this case, its use is for NDI Or 1 bit among RV bit is come whether indicate the layer for transmitting be first layer or the second layer.For example, supporting most four In the launch scenario of individual order, four layers are used.In this case, it can use 2 bits in the bit for NDI or RV Come indicate first to fourth layer which be used for launch.For example, in the launch scenario for supporting most eight orders, eight layers are used. In this case, it is first layer to the layer that indicates for transmitting using 3 bits among the bit for NDI or RV Which of four layers.
In embodiment 1-4-2, it can indicate what enabled TB was mapped to by the TB forbidden NDI or RV fields Layer group # (or index).For example, the layer for transmitting is divided into N groups, and it can be used for the total of NDI and RV M bit among totally 3 bits come indicate N layer groups which be used for launch.
If for example, being divided into two groups by four layers, marker group index can be carried out using 1 bit.If for example, by eight Layer is divided into four groups, then can carry out marker group index using 2 bits.If for example, being divided into two groups by eight layers, can make With 1 bit come marker group index.
In embodiment 1-4-3, it can indicate to be used to indicate whether to change RS by the TB forbidden NDI or RV fields The information of expense.As set forth above, it is possible to DRS expenses are changed according to total transmitting order, and can be in 3GPP LTE versions -10 The middle DRS limited according to order, but the DRS according to order can not be limited in version -9.Therefore, when version -9UE version - When being run in 10 systems, can more than can by version -9UE identify RS expenses state in launch RS.In this case, such as Fruit launches RS in being wherein identified as data by the RE regions of the user of version -9 transmitting, then in terms of version -9UE viewpoint, asks Topic can occur when receiving data.Therefore, it is necessary to the RE for not launching data wherein about whether existing to version -9UE notices.
1 bit among the NDI and/or RV of the TB for forbidding bit can be used to indicate about whether change The information of RS expenses.If RS expenses change mark and have the first value (such as opening), version -9UE can operate so as not to With reading data in the RE for the position correspondence for launching RS wherein in the system of version -10.In addition, when calculating effective compiling rate, It is considered that the RS expenses of increase calculate the quantity of subcarrier.Can be according to burst size/(quantity × tune of subcarrier Rank processed) calculate efficient coding speed.
In embodiment 1-4-4, the TB forbidden NDI or RV fields can be used to indicate whether to perform transmitting point Collect the designator of transmitting.
If as described above, using two antenna ports, DCI format 2A precoding information field is not limited.According to Existing DCI format 2A, do not limit precoding information field relative to 2 transmit antenna ports, but precoding information word Section is defined so that if a code word (that is, in the case of order 1) is enabled performs behaviour according to emission diversity scheme Make.If DCI format 2A formed for layer beam, the transmitting of order 1 is not explicitly indicated that.That is, the transmitting of order 1 is not indicated Whether be order 1 transmitting diversity transmitting or Wave beam forming.
If, can be with according to whether enabling two code words to carry out more specifically, do not limit precoding information field About whether the determination using the Wave beam forming of order -1 scheme or the Wave beam forming scheme of order -2.Scheme is formed even in layer beam In, it is also desirable to limit transmitting diversity needs using basic launch scenario.However, because emission diversity scheme corresponds to order -1 Transmitting, so being difficult to according only to whether enabling a code word and indicate whether to use the Wave beam forming of order -1 scheme or transmitting diversity Scheme.Therefore, if forbidding a code word, need to indicate whether to use the Wave beam forming of order -1 scheme or transmitting diversity side Case.
It can use whether the TB forbidden NDI or RV field restrictions use emission diversity scheme.If for example, forbid TB NDI values are the first values, then using emission diversity scheme, and the Wave beam forming of order -1 are used if NDI values are second values Scheme.In the case of emission diversity scheme, UE can use cell specific reference signal (CRS) and be launched using being used for 2 layers DRS come perform data demodulation.
Embodiment 1-5 is related to the method for supporting operations described below：The operation is used to enable version -9UE to identify work For empty RE RE position, in the RE position, launch the RS limited in 3GPP LTE versions -10., can for this method So that TB to CW exchange labelings to be used to indicate whether to have empty RE for the finger of the DRS transmittings limited in version -10 Show symbol.
If for example, TB to CW exchange labelings be the first value (for example, 0), it may be an indicator that using version -9DRS moulds Formula.In this case, if enabling TB 1 and forbidding TB 2, transmitting is performed via layer 0, and if forbid TB 1 simultaneously And enabled TB 2, then perform transmitting via layer 1.
If for example, TB to CW exchange labelings be second value (such as 1), it may be an indicator that use version -9DRS moulds In the presence of the RE of sky while formula.In this case, if enabling TB 1 and forbidding TB 2, transmitting is performed via layer 0, and And if forbidding TB 1 and enabled TB 2, then perform transmitting via layer 1.
In embodiment 1-5, TB can be set to CW mapping relations as shown in table 2.
In embodiment 1-6, TB to CW is mapped into exchange labeling field and is used as being used for the designator for indicating launch scenario.
In the present embodiment, if only enabling a TB, can indicate to launch according to TB to the value of CW exchange labelings One in diversity scheme or individual layer Wave beam forming scheme.If for example, TB to CW exchange labelings be the first value (for example, 0), It indicates to use emission diversity scheme.If TB is second value (for example, 1) to CW exchange labelings, it indicates to use individual layer ripple Beam forms scheme.In this case, if enabling TB 1 and forbidding TB 2, transmitting is performed via layer 0, and if prohibit Only TB 1 and enabled TB 2, then perform transmitting via layer 1.
In embodiment 1-7, formed for layer beam, the precoding information word that new interpretation limits in DCI format 2A Section.
In the DCI format 2A limited for Open-Loop Spatial Multiplexing, feelings that precoding information field is launched in 2 antenna ports It is arranged to 0 under condition, and is arranged to 2 bits in the case where 4 antenna ports are launched.Because layer beam forms transmitting mould Formula uses most 2 antenna ports, so precoding information field is not needed as described above, and even if when in layer beam Formed emission mode in precoding information field distribution bit when, " precoding information " field can be configured to 0 bit or It can be defined so as not to be explained.
As shown in table 6, in existing DCI format 2A, in the precoding information field for four antenna ports Exist reservation bit field (for example, if enable a code word if bit field 2 and 3, and if enable two code words Then bit field 3).It can be formed for layer beam and limit the bit field retained.
According to DCI format 2A, if as described above, enabled only one code word, can be explained using individual layer precoding Scheme or emission diversity scheme.Therefore, if formed using layer beam, down link control information is needed, to indicate Which scheme used.Hereinafter, will describe to be used to limit the precoding information word for being used for four antenna ports that layer beam is formed The various methods of the invention of some reserved fields of section.
As shown in table 14, can be via the precoding for four antenna ports if only enabling a code word The predetermined bit value of information field explicitly indicates " individual layer precoding ".
Table 14
Alternatively, as shown in table 15, then the precoding information field for four antenna ports may indicate whether Change RS expenses.More specifically, version -9UE is run in the system of 3GPP LTE versions -10 if as discussed above, then can change Become RS expenses.In this case, because version -9UE not can know that the RS positions limited in addition relative to version -10UE, then sternly The performance degradation of weight can occur in version -9UE down link data demodulation.Therefore, it is necessary to notify to be used for version -9UE Indicate the information of increase RS expenses and for for the precoding information word using four antenna ports for DCI format 2A The information of the precoding of order -1 and the precoding of order -2 the instruction increase RS expenses of the predetermined bit value of section.
Table 15
Alternatively, as shown in table 16, the precoding information field for four antenna ports can indicate that individual layer is pre- Coding, and indicate first and second layers (layer 0 and layers 1) which correspond to individual layer precoding.
Table 16
In table 16, if only enabling a code word, the instruction transmitting point of bit field 0 of precoding information field Collection.In this case, UE can be demodulated using CRS or DRS for two layers of transmitting to perform data.
Alternatively, as shown in Table 17, the precoding information field for four antenna ports may indicate whether to change Which of change RS expenses and first and second layers (layer 0 or layer 1) correspond to individual layer precoding.
Table 17
In table 17, if only enabling a code word and using emission diversity scheme, UE, which can be used, is used for two The CRS or DRS of layer transmitting demodulate to perform data.
According to the abovementioned embodiments of the present invention, there is provided can support simultaneously SU-MIMO in layer beam is formed and MU-MIMO DCI format.That is, formed for layer beam and the DCI format of individual layer Wave beam forming there can be identical bit Field size, and can dynamically be held by launching the PDCCH for the DCI format 2A for including the correction by proposition of the invention The switching of row therebetween.
Embodiment 2
Next, it will describe to be used for bit words of the new interpretation for the DCI format 1A or DCI format 1D of layer beam formation An alternative embodiment of the invention of section.
Table 18 shows DCI format 1 and the 1A limited in traditional 3GPP LTE standards (for example, 3GPP LTE versions -8). DCI format 1/1A includes the control information of the transmitting of order 1, such as individual antenna, single stream, transmitting diversity transmitting.
Table 18
DCI format 1A is defined for one PDSCH code word of compact scheduling in various emission modes, and can be with For emission diversity scheme.In the present invention, it is proposed that be used for the side for the DCI format 1A that layer beam is formed for new interpretation Method.(transmitting is semi-statically set as described above by higher level signaling if layer beam is formed and is defined to emission mode Pattern), then some bit fields can be construed to different from emission diversity scheme by UE in DCI format 1A explanation Implication.
Among the field limited in DCI format 1A, " mark for being used for form 0/1A differentiations " is arranged to 1 bit, " used In the mark that form 0/1A is distinguished " value 0 indicate form 0, and the value 1 of " be used for form 0/1A distinguish mark " indicates form 1A.Only when carrying out scrambled format 1A CRC using C-RNTI, form 1A is used for the random access procedure started by PDCCH ranks.
In addition, in the field limited in DCI format 1A, " the VRB distribution mark of localization/distribution " is arranged to 1 ratio Spy, and it is arranged to 0 if " mark for being used for form 0/1A differentiations " is arranged to 1 (that is, in the case of form 1A). Otherwise (that is, in the case of form 0), the instruction localization VRB distribution of value 0 of " the VRB distribution mark of localization/distribution ", and And the VRB distribution of the instruction distribution of value 1 of " the VRB distribution mark of localization/distribution ".
In embodiments of the invention 2-1, new interpretation " mark for being used for form 0/1A differentiations " is formed for layer beam. For example, the logical value of " if be used for form 0/1A distinguish mark " is the first value, using emission diversity scheme, and if The logical value of the mark distinguished for form 0/1A " is second value, then using individual layer Wave beam forming scheme.It is as described above, specific First value instruction 0 of the logical value of bit field is closed, and second value indicates 1 or opened, and vice versa.
Alternatively, can be in DRS patterns if the logical value of " being used for the mark that form 0/1A is distinguished " is the first value Middle instruction first layer (layer 0), the and if logical value of " be used for form 0/1A distinguish mark " is second value, then can be The second layer (layer 1) is indicated in DRS patterns.
Alternatively, if the logical value of " being used for the mark that form 0/1A is distinguished " is the first value, version -9DRS is used Pattern, and if the logical value of " being used for the mark that form 0/1A is distinguished " is second value, then using version -9DRS thereto The RE applications for launching DRS while pattern in version -10 in addition are empty.
In embodiment 2-2, new interpretation " VRB of localization/distribution distributes mark " is formed for layer beam.
For example, the logical value of " if the VRB distribution mark of localization/distribution " is the first value, transmitting diversity side is used Case, and if the logical value of " the VRB distribution mark of localization/distribution " is second value, then using individual layer Wave beam forming scheme.
Alternatively, can be in DRS moulds if the logical value of " the VRB distribution mark of localization/distribution " is the first value First layer (layer 0) is indicated in formula, and if the logical value of the VRB of localization/distribution " distribution mark " is second value, then can be with The second layer (layer 1) is indicated in DRS patterns.
Alternatively, if the logical value of the VRB of localization/distribution " distribution mark " is the first value, using version- 9DRS patterns, and if " the VRB distribution mark of localization/distribution " is second value, then using version -9DRS moulds thereto The RE applications for launching DRS while formula in version -10 in addition are empty.
In embodiment 2-3, formed for layer beam, new interpretation be used for " be used for form 0/1A distinguish mark " and 2 bits of " the VRB distribution mark of localization/distribution ".
For example, for " mark for being used for form 0/1A differentiations " and 2 bits of " the VRB distribution mark of localization/distribution " 1 bit can indicate transmitting diversity or individual layer Wave beam forming.If it is indicated that individual layer Wave beam forming, then remaining 1 bit can With one of first layer or second layer for being included in DRS patterns.
For example, for " mark for being used for form 0/1A differentiations " and 2 bits of " the VRB distribution mark of localization/distribution " 1 bit can indicate transmitting diversity or individual layer Wave beam forming.If it is indicated that individual layer Wave beam forming, then remaining 1 bit can To indicate whether that transmitting DRS RE applications are empty in addition in version -10 thereto.
For example, for " mark for being used for form 0/1A differentiations " and 2 bits of " the VRB distribution mark of localization/distribution " 1 bit can indicate the first layer (layer 0) in DRS patterns, and if logical value is the second layer, then can indicate Two layers (layers 1).Now, remaining 1 bit may indicate whether that transmitting DRS RE applications are empty in addition in version -10 thereto.
Table 19 shows to limit DCI format 1D in existing 3GPP LTE standards (version -8).
Table 19
The VRB distribution marks of localization/distribution 1 bit
Resource block distributes N-bit
MCS 5 bits
HARQ 3 bits (FDD), 4 bits (TDD)
NDI 1 bit
RV 2 bits
TPC command for PUCCH 2 bits
DL distribution index 0 bit (FDD), 2 bits (TDD)
TPMI information for precoding 2 bits (2Tx), 4 bits (4Tx)
Compact scheduling for a PDSCH with precoding and power offset information, DCI format 1D is limited, and DCI format 1D is launched for MU-MIMO.In the present invention, it is proposed that be used for the DCI of layer beam formation for new interpretation Form 1D method.If layer beam is formed and is defined to emission mode, UE can be by DCI format 1D some bit words Section is construed to have the implication different from MU-MIMO.
In the field limited in DCI format 1D, " the TPMI information for being used for precoding " field indicates the code for transmitting This index, there are 2 bits if the quantity of the antenna port of base station is 2, and if the quantity of the antenna port of base station is 4 Then there are 4 bits.
2-4 according to an embodiment of the invention, " it can be used to prelist for layer beam formation new interpretation DCI format 1D The TPMI information of code " field.
It is, for example, possible to use 1 bit of the TPMI information of precoding " be used for " field indicates emission diversity scheme or list Layer Wave beam forming scheme.If the logic of 1 bit of " the TPMI information for being used for precoding " field with 2 bits or 4 bits Value is the first value, it indicates that emission diversity scheme, and if " the TPMI letters for precoding with 2 bits or 4 bits The logical value of 1 bit of breath " field is second value, it indicates that individual layer Wave beam forming scheme.
Alternatively, 1 bit of " the TPMI information for being used for precoding " field is used, if the logical value of 1 bit is First value can then indicate first layer (layer 0) in DRS patterns, also, can be with if the logical value of 1 bit is second value The second layer (layer 1) is indicated in DRS patterns.
Alternatively, 1 bit of " the TPMI information for being used for precoding " field is used, may indicate whether thereto in version Transmitting DRS RE applications are empty in addition in -10 for this.
Alternatively, between 2 bits of " the TPMI information for being used for precoding " field, 1 bit can indicate transmitting point Collection scheme or individual layer Wave beam forming scheme, and remaining 1 bit can indicate first layer or the second layer in DRS patterns.
Alternatively, between 2 bits of " the TPMI information for being used for precoding " field, 1 bit can indicate transmitting point Collection scheme or individual layer Wave beam forming scheme, and remaining 1 bit may indicate whether in version -10 in addition to launch thereto DRS RE applications are empty.
Alternatively, between 2 bits of " the TPMI information for being used for precoding " field, 1 bit can be indicated in DRS moulds First layer or the second layer in formula, and remaining 1 bit may indicate whether to launch DRS in addition in version -10 thereto RE applications it is empty.
Embodiment 3
Hereinafter, will describe to be used to limit the other embodiment of the invention for being used for the new DCI format that layer beam is formed.
Formed in layer beam in transmitting, two enabled TB can be mapped to two CW, and by it via two layers Transmitting.In addition, the channel information that UE can use the reference signal by every layer of transmitting to obtain demodulates to perform data.In order to send out Two TB are penetrated, MCS, NDI and RV are limited relative to each TB.In addition, limit for changing between two TB and two CW The TB of mapping relations can be realized (robust) of robust to CW exchange labelings by TB to CW mapping relations exchange Data are launched.
Can by TDM/FDM/CDM schemes come designed for layer beam formed DRS layers be orthogonal.If Perform transmitting using only individual layer, then to UE notify in two layers of reference signal is supported with the layer for performing individual layer transmitting Corresponding reference signal, to improve data demodulation performance.Therefore, need to be used for for instruction in down link control information The bit field of the reference signal of individual layer Wave beam forming.
When based on DCI format 2A come formed designed for layer beam new (or correction) DCI format when, Ke Yikao Consider following item.
As described above, layer beam, which is formed, has maximum order 2.Because order is equal to the quantity of the TB for launching, no Need the independent designator for TB.In addition, UE can confirm that if the value of TB MCS indexes is arranged to 0 (or MCS The value of index is arranged to 0 and RV values and is arranged to 1) then forbid TB.UE can be identified impliedly if a TB is forbidden Order is arranged to 1, and if enabled in two TB, then order is arranged to 2.In addition, if every layer using DRS (precoding UE specific reference signals), then, then need not be in the layer beam using DRS because not necessarily indicating that the weighting matrix for precoding Precoding information is limited with DCI format in the case of formation.
In addition, if form emission mode using layer beam (semi-statically sets transmitting mould by higher level signaling Formula), then the DRS formed using layer beam is used for, and UE can receive data using two layers or individual layer.If using double Layer, then SU-MIMO operations can be performed, and if using individual layer, then can perform SU-MIMO or MU-MIMO operation.Can be with Using same DCI format so as in being formed in layer beam between SU-MIMO and MU-MIMO without distinguishing.That is, in bilayer In Wave beam forming and individual layer Wave beam forming, by the DCI with same bits field size come emission control information, and can be with Some bit fields formed for layer beam are construed to the designator for individual layer Wave beam forming.
In addition, if form emission mode using layer beam, then can be compact for only receiving the UE restrictions of individual layer DCI format.
By reference table 20 come the example of new DCI format that describes to meet above-mentioned consideration.DCI format shown in table 20 Including with DCI 2A identical fields, and below, will focus between new DCI format and existing DCI 2A forms Difference.
Table 20
The DCI format of table 20 is used to provide the control information that individual layer Wave beam forming and layer beam are formed.In individual layer wave beam In rock mechanism and layer beam rock mechanism, resource block distribution, the TPC command for PUCCH, downlink point can be limited With index, HARQ processing numbering, the MCS indexes for transmission block 1 and 2, new data indicator and redundancy versions and prelist Code information.These fields substantially have the implication identical implication with being limited in existing DCI format 2A.Wherein, prelist Code information field is arranged to 0 bit, as described above.
Unlike existing DCI format 2A, in the DCI format of table 20, TB to CW exchange labelings is used for double-deck ripple Beam is formed.In the case where individual layer Wave beam forming is launched, TB to CW exchange labelings can be construed to " level indicator ".
If enabling two TB, TB to CW exchange labelings can be used as being used to indicate TB to the letter of CW mapping relations Breath, and mapping relations can be limited as shown in Table 1.
If enabling a TB and forbidding another TB, enabled TB can be mapped to code word 0, such as in table 2 Shown in.In the case of the individual layer Wave beam forming for only enabling a code word wherein, TB to CW exchange labelings is construed to " layer Designator ".If the logical value of level indicator is the first value (0 or pass), it indicates that first layer (layer X), and if layer indicates The logical value of symbol is second value (1 or open), it indicates that the second layer (layer Y).Alternatively, in the logical value of level indicator, the One value can indicate 1 or open, and second value can indicate 0 or close.The logical value of level indicator can be indicated in first and Correspondence between two layers.Level indicator can be explained as shown in Table 21.
Table 21
" level indicator " can be referred to as " antenna port designator " or " reference signal (RS) position ", and can be solved Release to indicate layer (or antenna port) or layer/antenna port corresponding with enabled code word that RS is located at.UE can pass through Which layer the validation of information obtained from level indicator belongs to relative to the effective channel informations of UE.
According to the new DCI format limited in table 20, the DCI format with individual layer Wave beam forming is formed for layer beam It is set to identical size, and SU-MIMO and MU-MIMO dynamic mode adaptation and order 1 and order 2 can be realized Dynamic order adaptation.
Next, by reference table 22 come the other embodiment of new DCI format that describes to meet above-mentioned consideration.For letter It is single, the description of the common portion of the DCI format shown in table 20 and 22 will be omitted in.
Table 22
In the DCI format of table 22, TB similarly is limited to CW exchange labelings with existing DCI format 2A.That is, TB to CW Exchange labeling is formed for layer beam, is used as indicating TB to CW mapping relations if two code words are enabled Information, and mapping relations can be limited as shown in table 1.If enabling a TB and forbidding another TB, will make The TB of energy is mapped to code word 0, as shown in Table 2.
In the DCI format of table 11, if TB MCS index values are arranged to 0, (or MCS index values are arranged to 0 And RV values are arranged to 1), enable TB and forbid another TB, then UE can impliedly identify that individual layer Wave beam forming is launched.
The TB forbidden NDI fields can be construed to enabled TB level indicator.If for example, enabled TB 1 and Forbid TB 2, then whether the data that TB 1 NDI instructions are launched via enabled TB 1 are new data or the data of repeating transmission, and And TB 2 NDI fields can be construed to the level indicator (or antenna port designator/RS positions) for TB 1.For example, If enabled TB NDI logical value is the first value (0 or pass), it indicates that first layer (layer X) or first antenna port (antenna Port x), and if enabled TB NDI logical value is second value (1 or open), it indicates that the second layer (layer Y) or second day Line end mouth (antenna port Y).Alternatively, the first value of the logical value of NDI fields can indicate 1 or open that second value can refer to Show 0 or close, and the logical value of NDI fields can indicate correspondence between the first and the second layer.UE can be by from layer Which layer the validation of information that designator obtains belongs to relative to the effective channel informations of UE.Interpretation layer it can indicate as shown in Table 23 Symbol.
Table 23
According to the new DCI format limited in table 22, the DCI format with individual layer Wave beam forming is formed for layer beam It is set to identical size, and it is possible to realize SU-MIMO and MU-MIMO dynamic mode adaptation and order 1 and order 2 Dynamic order adaptation.
Next, by reference table 24 come the other embodiment of new DCI format that describes to meet above-mentioned consideration.For letter It is single, the description of the common portion for the DCI format being omitted in shown in table 20 and 24.
Table 24
In the DCI format of table 24, unlike existing DCI format 2A, TB is not limited to CW exchange labelings.Therefore, If enabling two code words, code word 0 can be mapped to TB 1, and code word 1 can be mapped to TB 2.
If enabling a TB and forbidding another TB, enabled TB can be mapped to code word 0, such as in table 2 Shown in.
In the DCI format of table 24, if TB MCS index values are arranged to 0, (or MCS index values are arranged to 0 And RV values are arranged to 1), enable TB, and forbid another TB, then UE can impliedly identify that individual layer Wave beam forming is sent out Penetrate.
The TB forbidden NDI fields can be interpreted enabled TB level indicator.If for example, enabled TB 1 and Forbid TB 2, then whether the data that TB 1 NDI instructions are launched via enabled TB are new data or the data of repeating transmission, and TB 2 NDI fields can be construed to the level indicator (or antenna port designator/RS positions) for TB 1.For example, such as The enabled TB of fruit NDI logical value is the first value (0 or pass), it indicates that first layer (layer X) or first antenna port (antenna end Mouthful X), and if enabled TB NDI logical value is second value (1 or open), it indicates that the second layer (layer Y) or the second antenna Port (antenna port Y).Alternatively, the first value of the logical value of NDI fields can indicate 1 or open that second value can indicate 0 Or close, and the logical value of NDI fields can indicate correspondence between the first and the second layer.UE can be by indicating from layer Which layer the validation of information that symbol obtains belongs to relative to the effective channel informations of UE.It can be indicated such as the interpretation layer as shown in table 23 Symbol.
, can be being configured to four antennas as shown in table 25 in the new DCI format limited as shown in Table 24 The precoding information field of port.
Table 25
The precoding information shown in table 25 can be used indicate layer index that enabled code word is mapped to And the change in RS expenses/do not change.For example, can indicate the layer group that enabled code word is mapped to index and How many layer launched in this layer of group.In addition to such information, the change in RS expenses/do not change can be indicated.In order to Version -9UE notifies the information for indicating increase RS expenses, can be indicated using the predetermined bit value of precoding information field For indicating the information of the increase RS expenses in the transmitting of order.
According to such as the new DCI format limited as shown in table 24, being formed for layer beam and individual layer Wave beam forming DCI format can be configured to identical size, to realize SU-MIMO and MU-MIMO dynamic mode adaptation and order 1 It is adapted to the dynamic order of order 2.
The new DCI format of table 20,22 and 24 can be referred to as the DCI format distinguished with existing DCI format 2 and 2A 2B or DCI format 2C (or other DCI format titles), and can be referred to as the antenna port X and Y that layer beam is formed The antenna port 7 and 8 that antenna port with being limited in existing LTE standard distinguishes.
According to the present invention each embodiment, for supported bilayer Wave beam forming, the existing DCI format of new interpretation, and The new DCI format distinguished with existing DCI format is limited, thus provides down link control information to UE.Specifically, Can in any one during the MCS fields during layer beam is formed using TB impliedly determine whether to forbid two TB, without Rank information is provided via clear and definite order designator.In addition, it is necessary to 1 bit information indicates for using most two layers of transmitting Layer (antenna port).At this point it is possible to the NDI bit fields for the TB forbidden being used for using utilizing between two TB are come marker Method support to use transmitting of the single layer to two UE.
MU-MIMO launch scenarios based on DMRS
Hereinafter, this hair for signal transmitting/reception in the wireless communication system for supporting MU-MIMO transmittings will be described Bright suggestion.
Mimo system is referred to for improving transmitting/receiving efficiency using multiple transmitting antennas and multiple reception antennas System.MIMO technology includes emission diversity scheme and spatial multiplex scheme.Space diversity scheme is suitable for the UE quickly moved Launch data, because can increase launcher reliability by diversity gain or radius of society can be increased.Spatial multiplex scheme Can be by launching different data simultaneously to increase data transmission rate, without increasing system bandwidth.
In mimo systems, each transmitting antenna has independent data channel.Transmitting antenna can represent virtual-antenna Or physical antenna.Receiver estimates channel relative to each transmitting antenna, and receives the data from the transmitting of each transmitting antenna. Channel estimation refers to compensation because causing received signal decline and recovering and the processing of caused distorted signals.Decline refers to Be wherein because multipath propagation in a wireless communication system and time delay cause the rapid phenomenon for changing signal level. For channel estimation, it is necessary to the reference signal that both transmitter and receiver are both known about.In addition, reference signal can be according to standard It is referred to as RS or pilot tone.
In various downlink reference signals, limit and specifically demodulate RS (DMRS) for the UE of data demodulation.DMRS Special RS (DRS) as described above can be referred to as.In MU-MIMO transmittings, the specific DMRS of UE can be used.Each UE can To perform MU-MIMO operation using the channel information obtained by the DMRS based on precoding, without disturbing other UE.
In the MU-MIMO transmittings of multilayer are supported, DMRS expenses and DMRS can be changed on RB according to transmitting order Position.If each UE for performing MU-MIMO operation does not know another UE in the presence of execution MU-MIMO operation, each DMRS to the RB distribution for another UE is mistakenly identified as the DMRS of the data transmitting distribution for each UE by UE, and can To cause maloperation when data demodulate.Therefore, the present invention proposes a kind of for enabling each UE supporting multilayer The method accurately operated in MU-MIMO transmittings.
Fig. 7 is the public reference signal (CRS) and dedicated reference letter being shown in 3GPP LTE systems (for example, version -8) The figure of the pattern of number (DRS).CRS can be referred to as cell specific reference signal, and DRS can be referred to as UE with particular reference to letter Number.
Fig. 7 is the figure for being shown in the RE that CRS and DRS in the case of common CP are mapped to.In the figure 7, trunnion axis indicates Time domain (OFDM symbol unit), and vertically indicate frequency domain (subcarrier unit).It is associated with reference signal mode, common In the case of CP, 14 OFDM symbols in the time domain and 12 subcarriers in a frequency domain are changed into RB base unit.Expanding In the case of the CP of exhibition, 12 OFDM symbols and 12 subcarriers are changed into the base unit of the RB for reference signal mode.In Fig. 7 Shown in temporal frequency domain in, minimum rectangular area corresponds to an OFDM symbol in the time domain and corresponding in frequency A subcarrier in domain.
In the figure 7, Rp indicates the RE for carrying out transmitted reference signal via p-th of antenna port.For example, R0 to R3 is indicated The RE that the CRS launched via the 0th to the 3rd antenna port is mapped to, and the DRS that R5 instructions are launched via the 5th antenna port The RE being mapped to.Launched with the interval of 6 subcarriers on the 0th, 4,7 and 11OFDM symbols (based on an antenna port) The CRS launched via the 0th and the 1st antenna port.With 6 subcarriers on the 1st and 8OFDM symbols (being based on an antenna port) Interval come launch via the 2nd and the 3rd antenna port launch CRS.On the 3rd, 6,9 and 12OFDM symbols in each subframe with DRS is launched at the intervals of 4 subcarriers.Therefore, the transmitting 12 in two RB continuous in time (RB to) of a subframe Individual DRS.
CRS (or cell specific reference signal) is used for the channel for estimating physical antenna, and is located at by being publicly transmitted into All UE in cell.Demodulation can be used for by the CRS channel informations estimated by UE and use such as single-antenna transmission, transmitting point Collection, Closed-Loop Spatial Multiplexing, Open-Loop Spatial Multiplexing and multiuser MIMO (MU-MIMO) launching technique transmitting data, and can For enabling UE to measure channel and to base station repeats channel measurement.In order to strengthen channel estimating performance by CRS, The position of the CRS in subframe can be shifted on a per-cell basis with different from each other.If for example, with three subcarriers Interval position RS, then CRS can be arranged on 3k subcarriers in specific cell, and CRS can be positioned at separately On (3k+1) subcarrier in one cell.
DRS (or the specific RS of UE) demodulates for data, and therefore can be referred to as demodulated reference signal (DMRS).Pass through When the MIMO in the case of no change in RS launches using the precoding weighting for particular UE, UE can estimate equivalent Channel, wherein, when receiving RS, combine the precoding weighted sum launch channel launched by each transmitting antenna.In addition, DRS It is required that the orthogonality between emission layer.
Traditional 3GPP LTE systems (for example, the system of 3GPP LTE versions -8) support most 4- transmittings (Tx) antenna hairs Penetrate, and limit for supporting single Tx antennas, the specific CS of cell of 2-Tx antennas and 4-Tx antennas and for the wave beam shape of order 1 Into the specific RS of cell.Meanwhile in the system of 3GPP LTE versions -9, a UE can receive the transmitting of maximum order 2.
Meanwhile in advanced LTE (LTE-A) system (system of 3GPP LTE versions -10 and the root from 3GPP LTE system evolution According to the system of its subsequent standard) in, it may be considered that high-order mimo, multiple cell transmitting or Advanced multi-user (MU)-MIMO.Cause This, the MIMO scheme for the transmitting for being used to perform maximum order 8 is applied to a UE.It is efficient in order to support in lte-a system RS is managed and highest-order emission method, considers the data demodulation based on DRS.As described above, the data demodulation instruction based on DRS is for example In the case that UE receives down link data from base station wherein the channel letter for demodulation of downlink data is obtained from DRS Breath.Furthermore, it is preferred that DRS is set to cause the downlink transmission carried out by base station only in the resource block and layer of scheduling be present. For example, the transmitting instruction of the maximum order 8 based on DRS using the data-reusing for UE and launches 8 DRS of maximum.
In the DRS of the transmitting for supporting the maximum order 8 on radio resource arrangement, use can be multiplexed and arranged In the DRS of layer.Time division multiplexing (TDM) instruction is arranged for two or more on different time resources (for example, OFDM symbol) The DRS of multilayer.Frequency division multiplexing (FDM) instruction is arranged for two or more in different frequency resources (for example, subcarrier) The DRS of layer.Code division multiplexing (CDM) instruction is used in identical radio resource using orthogonal sequence (or orthogonal covering) to be multiplexed The DRS of two or more layers of upper arrangement.
Hereinafter, DMRS will be described in further detail.The uplink higher than 3GPP LTE system is supported as described above, discussing The design of the 3GPP lte-a systems of road/downlink transmission rate.In 3GPP lte-a systems, downlink mimo transmitting branch Maximum order 8 is held, and data demodulation can be performed based on the specific DMRS of UE.Therefore, it is necessary to support the transmitting of order 1 to 8 DMRS design.The layer beam that DMRS for the transmitting of LTE-A order 1 and 2 can be used for 3GPP LTE versions -9 is formed. Before describing to be used for the DMRS of 3GPP LTE-A downlink mimos transmitting, description is used for traditional 3GPP LTE system (versions This -8 or version -9) downlink mimo transmitting DMRS.
In the 3GPP LTE systems as the previous release of 3GPP lte-a systems, downlink mimo is supported Transmitting.In the downlink mimo transmitting of the system of 3GPP LTE versions -8, it can support that the DMRS based on precoding (can be by The specific RS of referred to as DRS or UE) individual layer Wave beam forming.If performing downlink transmission using the DMRS of precoding, because To include precoding weighting by the DMRS of the precoding channel information estimated by receiver, so transmitter need not be to connecing Receive information of the device notice on precoding weighting.As the evolution form of such individual layer beam-forming technology, in 3GPP LTE , can be with supported bilayer (or double fluid) Wave beam forming in the downlink mimo transmitting of the system of version -9.Layer beam forms technology It is the MIMO launch scenarios of transmitting DMRS, supporting maximum order 2 based on precoding.
DMRS explained below for lte-a system is designed.
Launch for the downlink mimo of lte-a system, the RS of precoding can be used, and can be by using pre- The RS of coding reduces RS expenses.Because by with the precoder identical precoder to data application come precoding DMRS, so pre-coding matrix is transparent for UE.Therefore, only launch DMRS corresponding with layer, but do not launch independent Precoding information.
DMRS expenses will now be described.DMRS expenses can be defined as being used for each RB's in each transmitting order DMRS RE quantity (for example, a subframe in the time domain × 12 subcarriers) in a frequency domain.
, can be using 12 RE come for the DMRS in a RB in the transmitting of order 1.This equates in 3GPP LTE The expense of DMRS (antenna port index 5) in version -8.
In the transmitting of order two or more, DMRS that 24 RE of maximum can be used in a RB.In order two or more , can be by the DMRS of the same RE each antenna ports being used in each order in transmitting.
Further, it is possible to use identical DMRS patterns, and it is unrelated with subframe type (TDD or FDD schemes).If can be with Subframe type independently uses same DMRS patterns, then can reduce the complexity of UE operations.
Hereinafter, the viewpoint increased from emission mode independence, order independence, subframe independence and DMRS power is described The details that DMRS for lte-a system is designed.
In the transmitting of 8 layers of the maximum in lte-a system, the specific precoding DMRS of UE are supported to realize that high spectrum is imitated Rate (or bandwidth efficiency).Because UE specifically limits DMRS, must be determined whether to optimize for each emission mode DMRS or whether unrelated with emission mode using same DMRS., can be unrelated with emission mode in the complexity of UE operations The unified DMRS that ground performs same demodulation operation is beneficial.In addition, according to SU-MIMO, MU-MIMO and coordinate multipoint (CoMP) combined optimization of transmitting/reception technique, the same DMRS unrelated with emission mode use beneficial to：In various transmittings In pattern, flexible scheduling is pellucidly performed for UE.Therefore, as long as not significantly affecting performance, then it is preferably used same DMRS patterns and it is unrelated with emission mode.
Using for the same DMRS pattern unrelated with order can be valuably used at following aspects：UE can be in such as SU- Identical demodulation process is performed in the different emission modes of MIMO, MU-MIMO and CoMP transmitting/reception technique.It is unrelated with order The use of same DMRS patterns represents that every layer of DMRS patterns (for example, temporal frequency position and code) are identical in all orders 's.For example, can be by estimating and 1 corresponding channel of layer index with the unrelated same channel estimator of order.In other words, with The use of the unrelated same DMRS patterns of order represents that the DMRS patterns of low-rank are the subsets of the DMRS patterns of high order.If with order without Close ground and use same DMRS patterns, then because UE can perform data solution in all emission modes using identical operation Adjust, it is possible to reduce the complexity of UE operations.It is therefore preferred that relative to every layer using fixed DMRS patterns, and and order It is unrelated.
In order to independently use a DMRS pattern and in FDM schemes and TDD with subframe type (FDD or TDD schemes) Versatility is kept in scheme, it is necessary to be properly set for the position of the OFDM symbol of DMRS transmittings.More specifically, it is used as using The OFDM symbol in period is protected in relay return link (link between base station and repeater) subframe, in TDD side Last OFDM symbol of synchronizing channel transmitting in case etc. can be not used in DMRS transmittings.In addition, be included in 3GPP LTE versions- The OFDM symbol of the cell specific reference signal (or CRS) limited in 8 can be not used in DMRS transmittings.Because make wherein (reference signal power increase is represented from the RE in an OFDM symbol in the case of being increased with the power of cell specific reference signal In in addition to the RE distributed for reference signal RE lending power), reduce DMRS transmission powers, and when with thereon When launching transmitting DMRS in the OFDM symbol identical OFDM symbol of cell specific reference signal, demodulation performance deterioration.Therefore, exist In the OFDM symbol that the protection period of relay backhaul subframe and cell specific reference signal are assigned to, being preferably set up DMRS makes Obtain and be not launched.
As set forth above, it is possible to DMRS expenses are arranged to 12 RE in a RB in the transmitting of order 1, and higher DMRS expenses are arranged to 24 RE of maximum in the transmitting of order.However, DMRS transmission powers are also regarded as DMRS expenses.If make The DMRS for multilayer is multiplexed with CDM schemes, then because sharing DMRS transmission powers, channel estimation between multilayer It is able to can be deteriorated when the quantity increase of layer.Therefore, it may be considered that DMRS power increases.
According to explanation above, it is proposed that use the several method of DMRS patterns.As described above, in order to reduce UE operations Complexity and provide flexibility, it may be considered that the method for being multiplexed the DMRS for multilayer using CDM schemes.
Fig. 8 and 9 pattern 1 corresponds to the candidate for the DMRS patterns based on CDM for supporting high order to pattern 4.
In order to independently set fixed DMRS patterns for every layer with order, so the multiplexing of CDM types is applied to include 12 RE CDM groups.In figs. 8 and 9, " C " and " D " instruction can be multiplexed most four layers of CDM groups.It is shown in figs. 8 and 9 DMRS patterns can meet above-mentioned emission mode independence and order independence DMRS attributes.
Typically, Fig. 8 (a) DMRS patterns will be described.A CDM group is formed by " C " 12 RE indicated.At one In CDM groups, four layers can be multiplexed using Walsh cover, using CDM schemes.In other words, can be arranged on same RE For four layers of DMRS, and it is possible to be used for each layer of DMRS using CDM resources to distinguish (or identification).Relative to first Layer is multiplied by orthogonal covering (1,1,1,1), is multiplied by orthogonal covering (1, -1,1, -1) relative to the second layer, is multiplied by relative to third layer Orthogonal covering (1,1, -1, -1), and it is multiplied by orthogonal covering (1, -1, -1,1) relative to the 4th layer.Alternatively, for example, such as Fruit is multiplexed the DMRS for 3 or fewer layers, then can be selectively applied in four different orthogonal coverings 3 s' or less Orthogonal covering.If for example, be multiplexed the DMRS for two layers, can use 4 different orthogonal coverings two (for example, (1,1,1,1) and (1, -1,1, -1)) distinguish (or identification) two DMRS.
In Fig. 8 and 9 DMRS patterns, DMRS expenses can be changed according to transmitting order.As shown in figs, in order to Most 8 layers are supported, using two CDM groups, and each CDM groups can support most four layers.Therefore, can be according to CDM groups Quantity is defined differently than DMRS expenses.Therefore, it is contemplated that two schemes.
First, in the case of order 1 and order 2,12 RE DMRS expenses can be set, and in the situation of order 3 to 8 Under, 24 RE DMRS expenses can be set.In the setting of such DMRS expenses, the He of order 1 can be limited in a CDM group Order 2, and two CDM groups can be used from order 3.Therefore, in the case of big in order 3 or more, because substantial amounts of when using The robustness in UE mobility can be increased during DMRS, it is possible to ensure the superperformance relative to low-rank.However, in order 3 and order 4 in the case of, RS expenses are too high.
Alternatively, in the case of order 1 to 4,12 RE DMRS expenses can be set, also, in the feelings of order 5 to 8 Under condition, 24 RE DMRS expenses can be set.In the setting of such DMRS expenses, because can be limited in a CDM group Determine order 1 to 4, it is compared to the above compared with RS expenses can be reduced so in terms of the viewpoint of order 3 and 4.However, in high-doppler It is compared to the above compared with channel estimating performance can be reduced in the case of frequency.
In the above two method set for DMRS expenses, because having folding between channel estimating performance and RS expenses Inner feelings, so needing suitably to set DMRS expenses according to channel estimation Signal and RS expenses.
Hereinafter, MU-MIMO launch scenarios will be described in further detail.As described above, in order to operate 3GPP LTE (for example, Version -8) MU-MIMO that limits in system, each UE can use by the precoding weighted information of control channel acquisition and The channel information obtained by cell specific reference signal demodulates to perform data.When in lte-a system and being wherein designed to When supporting to perform MU-MIMO in the DMRS of the multilayer system of 3GPP LTE versions -9, base station need not notify precoding to each UE Weighting, and each UE can use the channel information obtained by DMRS to perform MU-MIMO operation, be done without multi-user Disturb.In order that obtaining UE is able to carry out accurate operation, it is necessary to indicate which among the channel information of the multilayer obtained from DMRS Individual layer information is used for specific UE.Hereinafter, will describe to set for the MU-MIMO of the system of 3GPP LTE versions -9 and lte-a system Meter method.
In the system of 3GPP LTE versions -9, it can be supported using the specific precoding DMRS of UE from 3GPP LTE versions The layer beam of the individual layer Wave beam forming extension limited in this -8 system is formed.Consequently, because can support up to two layers, so The SU-MIMO using precoding DMRS can be supported.In the SU-MIMO schemes using precoding DMRS, because can be with right Optimize precoder in a base station in the transparent modes of UE, it is possible to provide with compared with the SU-MIMO schemes based on code book Better performance.In order to provide higher throughput of system in the system of 3GPP LTE versions -9, it is necessary to by by layer beam The scope of formation extends to MU-MIMO to support MU-MIMO from SU-MIMO.
Relative to the MU-MIMO schemes formed based on the layer beam in the system of 3GPP LTE versions -9, it may be considered that Whether MU-MIMO, orthogonal DMRS or nonopiate DMRS, interference elimination/suppression among UEs, right is supported in layer beam is formed Minimum, power in the influence of existing standard file share designator etc..Hereinafter, it will be described in such consideration.In addition, The advantages of multilayer DMRS of precoding MU-MIMO optimization will be described to use.
In the system of 3GPP LTE versions -8, because being supported in the case of not on the information of interference channel using pre- The encoding D MRS MU-MIMO schemes based on space division multiple access (SDMA), so systematic function is relatively low, and UE can not cancel or Suppress cochannel interference.Therefore it provides limited performance, because systematic function depends on antenna configuration and scheduler.In order to increase MU-MIMO schemes in the system of 3GPP LTE versions -9 by force, it is preferred that by allow UE interference elimination/suppression (as long as Not for the influence of existing normative document) more preferable systematic function and robustness be provided.
In order to support single user layer beam to be formed, in order to support the transmitting of more preferable order 2, orthogonal DMRS can be used. Therefore, if performance gain can be obtained, preferably up to using for the orthogonal DMRS of MU-MIMO designs.In order to Improve MU-MIMO performances, UE Signal to Interference plus Noise Ratio can be increased by eliminating or suppressing cochannel interference (SINR).Therefore, for better performance, it is preferred to use the orthogonal DMRS for allowing interference channel to estimate.
As described above, in MU-MIMO schemes based on SDMA in the system of 3GPP LTE versions -8, because can not be in UE Middle elimination and/or suppression cochannel interference, so performance is limited into specified level.In order to allow interference to eliminate, it is necessary to same Another UE dispatched jointly in Physical Resource Block (PRB) modulation and the scheduling of compilation scheme (MCS) and such as channel and order Information, and therefore can produce excessive signaling consumption.In addition, if the UE not dispatched jointly to same PRB distribution, then use It can become serious in the signaling consumption that interference eliminates.Because AF panel only needs interference channel information, AF panel is made Can be preferable for interference elimination for the method for the enhancing MU-MIMO in the system of 3GPP LTE versions -9.If UE Know the presence for disturbing its another UE and the DMRS index associated with UE RB demodulation, then can use orthogonal DMRS To perform interference channel estimation.Therefore, AF panel is supported in -9 double-deck MU-MIMO of 3GPP LTE versions, and preferably Control information (DMRS indexes and UE common scheduling indicator) for AF panel is provided.Can be according to for existing mark The determination for influenceing the control information to be made regarding whether to explicitly indicate for UE needs of quasi- file.
In the control information associated with AF panel, adjusted if clearly transmitting is common in the PRB of each scheduling The designator of degree can then increase signaling consumption to avoid scheduling from limiting.In this case, the DMRS based on CDM can be solved The problem of certainly such.That is, if the energy measuring in the PRB of each scheduling can be passed through using the DMRS based on CDM, UE To detect the cochannel interference for orthogonal DMRS.In addition, if in the presence of another interference UE, then can be in each scheduling Suppress interference signal in PRB.Therefore, can be minimized using the DMRS designators of the orthogonal DMRS based on CDM for supporting MU- The influence of MIMO normative document.If it can be used to means, common PDCCH as the SU-MIMO transmitting applications of order 1 In SU-MIMO and MU-MIMO.
In the system of 3GPP LTE versions -8, because cell specifically provides CRS, if adjusted using quadrature amplitude Make (QAM), then power can be needed to share information to be used to demodulate.If however, using the specific RS of UE (because not with another UE shares the specific RS of UE), then power is implicitly included in RS and shares information.In this case, UE can estimate to send out thereon The RE for penetrating the RE of data and launching the specific RS of UE thereon has identical power level.Therefore, only can carry out on being The determination of no support DMRS power increase, to strengthen channel estimating performance, and this also sets up in the case of SU-MIMO. Therefore, in order to support MU-MIMO, power can not be specified to share designator.
When considering the transmittings of the MIMO based on DMRS, as set forth above, it is possible to be opened according to transmitting order to be arranged differently than DMRS Pin.For example, supporting the DMRS of order 1 to 2 has constant expense, but support order 3 or bigger DMRS that there is the expense of increase. Alternatively, supporting the DMRS of order 1 to 4 has constant expense, but supports order 5 or bigger DMRS to have opening for increase Pin.
If consistently keep order 1 to 2 DMRS expense, can by the system of 3GPP LTE versions -9 based on DMRS layer beam forms, consistently keeps DMRS expenses in data transmitting.Propped up when in the system of 3GPP LTE versions -9 When holding MU-MIMO, most two UE (each UE performs individual layer transmitting) can be multiplexed, base station can be in MU-MIMO The position for the DMRS being maintained on RB and constant DMRS expenses, because launching order 2 in the MIMO transmittings based on DMRS DMRS.Base station indicates certain layer between the two layers to the UE for performing MU-MIMO transmittings so that UE obtains orthogonal channel.Such as Fruit does not change DMRS expenses or the DMRS on RB position, then can perform MU-MIMO using level indicator.
Meanwhile relative to the order of the standard as the position for changing DMRS expenses and the DMRS on RB, if Support MU-MIMO maximum order is determined in the range of more than the standard, then can be in the demodulation of MU-MIMO UE data be performed Produce the problem of serious.For example, in the case of order 1 to 2, using Fig. 8 (a) CDM groups " C " (that is, using in a RB 12 RE) be multiplexed DMRS, and it is in order 3 or bigger in the case of, using Fig. 8 (a) CDM groups " C " and " D " (that is, using 24 RE in one RB) it is multiplexed DMRS.In this case, it is assumed that the DMRS of the support order 1 to 2 on RB opening position is another Outer arrangement DMRS, for order 3 or bigger transmitting.Now, if it is assumed that receive individual layer transmitting three UE be re-used so as to MU-MIMO operation is performed, then base station is launched using the DMRS of support order 3 to perform data.First layer and the second layer are assigned to UE (the first and second UE) obtain channel from the DMRS of order 1 to 2, and the UE (the 3rd UE) that third layer is assigned to from for The DMRS that the DMRS of order 3 is distributed in addition obtains channel.If as described above, indicate what is distributed to each UE using level indicator Layer, the then presence for the possible nonrecognition third layer of UE (the first and second UE) that first layer and the second layer are assigned to.Now, because The RE that first and second UE misidentify increased DMRS is used for demodulating data, rather than DMRS, it is possible to first and second The problem of serious is produced in UE data demodulation.Therefore, if changing the position of DMRS expenses and DMRS on RB according to order, Then need to notify maximum order to the UE for performing MU-MIMO.
Embodiment 4
Hereinafter, the embodiments of the invention for the MU-MIMO transmittings based on DMRS be will be described in.
In the present invention, using order designator so as to perform MU-MIMO UE notify maximum order.In SU-MIMO, order Designator can indicate the order currently launched.In MU-MIMO, order designator, which can serve to indicate that, is wherein multiplexed multiple users' Total order or the quantity of the layer distributed to particular UE.
More specifically, the UE of total transmitting order to(for) MU-MIMO multiplexings can be indicated using order designator.For example, If there is M (M >=2) the individual UE for the transmitting for performing order N, then base station performs the transmitting of K (K=N*M) individual order altogether.Now, base Stand and the transmitting of K order altogether is performed to UE notices, and the DMRS patterns for supporting order K, and UE are used by order designator Identification uses the DMRS for supporting order K.According to such method, even if when according to transmitting order to change DMRS patterns or expense, UE can also be in the RE for DMRS and for distinguishing (identification) between the RE of data.UE can obtain K by order K DMRS The channel of layer, and which layer of the validation of information by being obtained from level indicator is with relative to the effective channel informations of UE.
For example it is assumed that if total transmitting order is 3, a UE supports the transmitting of order 1.It is assumed that base station is total by being up to Transmitting order be 2,12 RE in a RB launch DMRS and by a RB in 3 or bigger total transmitting order In 24 RE launch DMRS.If the UE for performing MU-MIMO does not know the information on total transmitting order, UE can know by mistake Not in DMRS positions (12 RE positions in a RB, for example, Fig. 8 (a) " C " position except the transmitting for order 1 Put) outside position transmitting data.Consequently, because launch the RE positions of the DMRS for another UE wherein (in a RB In 12 additional RE positions, for example, Fig. 8 (a) " D " position) place transmitting data hypothesis under UE perform data demodulation, institute With can not accurately demodulating data.If on the contrary, as described above, UE known about the information of total transmitting order, UE can know Road in addition to relative to the effective DMRS of UE position, the RE positions that are assigned to relative to the effective DMRS of another UE Put, and can identify and not launch data at those RE.Therefore, UE can launch DMRS RE thereon and distribute thereon Distinguished between the RE of data, and accurately carry out data demodulation.
If allowing the transmitting of maximum order 1 only with respect to each UE for performing MU-MIMO operation, UE can only obtain by The channel of the layer of level indicator instruction.
Meanwhile if allow maximum order P transmitting (P >=2) and relative relative to each UE for performing MU-MIMO operation Multiple codeword is allowed to launch in each UE, then EU can obtain the channel of P layers with ascending order from the layer indicated by level indicator.Example Such as, if allowing to launch using most two layers of data, the layer (for example, layer index 1) indicated by level indicator can be obtained With the channel of its next layer (for example, layer index 2).Meanwhile if perform list in most two layers of the state of transmitting is allowed Layer transmitting, then UE can perceive the transmitting of order 1 by other information.For example, UE can be from the MCS embodying informations of each code Ground is confirmed whether enablement code word, and obtains the quantity of emission layer.If for example, enabling two code words, UE can know The transmitting of other order 2, and if only enabling a code word, then UE can identify the transmitting of order 1.
If allow most order P transmitting (P >=2) and relative to every relative to each UE for performing MU-MIMO operation Individual UE allows single code word to launch, then UE can obtain the channel of P layers with ascending order from the layer indicated by level indicator.
In a word, total transmitting order can be provided, on relative to by identical resource to perform the UE of MU-MIMO operation In the information of the effective layers of each UE and each UE rank information, with DMRS position and on carrying out area between RB data Not, and obtain relative to the effective channel informations of UE.
In various embodiments of the present invention, following setting is applied in association with order designator.
It is possible, firstly, to 3 bit order designators are set using to indicate up to most orders 8.
Secondly, in the instruction using total order for MU-MIMO multiplexings of 2 bit order designators, it can set and refer to Show up to maximum order 4.
3rd, it can use and be used to indicate DMRS expenses or 1 bit indicator that position changes, and it is not provided with order instruction Symbol.1 bit indicator can indicate whether to increase DMRS expenses (or other DMRS positions) using ON/OFF.
In order to support above-mentioned MU-MIMO operation, it is necessary to which the new restricted code word of viewpoint from base station and UE maps to layer and closed System.Reference table 26 to 37 is described into this point.
Table 26 to 31 shows that code word to layer in the following cases maps：Relative to each of execution MU-MIMO operation UE allows the transmitting of maximum order P (P >=2), and allows the hair of multiple code words (most two code words) relative to each UE Penetrate.Code word to layer in the case that table 26 to 29 shows the emission maximum order 1,2,3 and 4 in terms of the viewpoint from base station maps. Table 30 and 31 shows that code word to the layer in the case of the maximum reception order 1 and 2 in terms of the viewpoint from UE maps.
Table 26
Table 27
Table 28
Table 29
Table 30
Table 31
Table 32 to 37 shows that code word to layer in the following cases maps：Relative to each of execution MU-MIMO operation UE allows most order P (P >=2), and allows the transmitting of single code word (code word) relative to each UE.Table 32 to 35 Show that code word to the layer in the case of the emission maximum order 1,2,3 and 4 in terms of the viewpoint from base station maps.Table 36 and 37 is shown Code word to layer in the case of the maximum reception order 1 and 2 in terms of the viewpoint from UE maps.
Table 32
Table 33
Table 34
Table 35
Table 36
Table 37
Code word to layer mapping relations in the case of maximum reception order 2 can be applied not only to initial transmissions, Er Qieyong The repeating transmission in MU-MIMO transmittings in terms of the viewpoint from UE shown in table 26 and 37.
SU-MIMO and MU-MIMO control information are supported simultaneously
In above-mentioned each embodiment of the present invention, come in the system of supported bilayer Wave beam forming, proposed based on DMRS It is a kind of be used to indicating in the DMRS for transmitting it is to be read come for data demodulation layer method.If perform bilayer It Wave beam forming, then can launch DMRS by 12 RE on a RB, and two orthogonal covering codes can be used (OCC) distinguish (or identification) and be used for every layer of DMRS.I.e., it is possible to two OCC are used as being used to distinguish the orthogonal of (or identification) DMRS Resource.In addition, as when using two layers to perform MU-MIMO transmittings when effective DMRS of the instruction in the DMRS resources of transmitting Method, the NDI bits for forbidding code word can be used.
DMRS patterns will be described with reference to figure 8 (a).In Fig. 8 (a), DMRS can be mapped to 24 RE in a RB. In Fig. 8 (a), (or identification) 12 REs corresponding with CDM groups " C " and right with CDM groups " D " are distinguished in time domain/frequency domain 12 RE answered.In group " C " and " D ", (or identification) four different DMRS can be distinguished using orthogonal code resource.Scheming In 8 (a), (or identification) four different DMRS are distinguished using four orthogonal Walsh codes.It is orthogonal using four in Fig. 8 (a) Walsh code distinguishes (identification) four different DMRS.
Alternatively, a DMRS CDM group can be divided into two subgroups.Two subgroups are accurate orthogonal each other.Can be with Distinguished (or identification) two layers (or antenna port) using the completely orthogonal sequence in a subgroup.Two completely orthogonal Sequence can be such as { 1,1,1,1 } and { 1, -1,1, -1 }.In other words, by two completely orthogonal sequences come distinguish (or know DMRS not) be for different antennae port DMRS (for example, relative to antenna port X use { 1,1,1,1 } code resource, And use { 1, -1,1, -1 } relative to antenna port Y), come area using relative to the quasiorthogonal code resource of each antenna port It is divided to (or identification) two DMRS (for example, two DMRS for being distinguished (or identification) relative to antenna port X be present, and relatively Two DMRS for being distinguished (or identification) in antenna port Y be present).In a word, in a DMRS CDM group being made up of 12 RE On (for example, " C "), (or identification) different DMRS of total of four can be distinguished by code resource.Meanwhile CDM groups " C " and " D " can be known respectively as group 1 and group 2.As the resource distinguished between DMRS, because two groups can be used, and can Four orthogonal resources are used with each group, so ensureing 8 orthogonal resources altogether.
It is assumed that the DMRS transmittings that 12 RE are used in order 1 and 2, and 24 RE are used in order 3 or big-and-middle DMRS Transmitting.When only one group (that is, " C ") is used for the up-link transmitting of up to order 2, two groups (that is, " C " and " D ") are used for Order 3 or big-and-middle DMRS transmittings.If for example, to first to fourth layer of transmitting DMRS in the transmitting of order 4, for any The DMRS of two layers (for example, first and second layers) is mapped to a group (for example, " C "), and be distinguished using OCC (or know Not), and for the DMRS of remaining two layers (for example, third and fourth layer) another group (for example, " D ") is mapped to, and made It is distinguished (or identification) with OCC.
If in terms of the viewpoint of transmitter perform using most four layers MU-MIMO launch, using for distinguish (or know Not) four layers of DMRS.Now, each receiver needs to obtain the information on corresponding layer.As described above, according to for Carry out the method for marker using the NDI bits (1 bit) for the code word forbidden, because can support wherein each using individual layer Up to two UE, so needing a kind of method for being used to indicate the layer of extension.
It is possible, firstly, to limit CDM group indication bits.For example, to UE layer can be notified to belong to first by 1 bit indicator With which of the 2nd CDM groups (for example, Fig. 8 (a) " C " or " D ").One group is made up of 12 RE, and can use CDM side Case is multiplexed (that is, distinguish) most four DMRS, and launches most four DMRS via every group.In most four layers of MU- , can be using being multiplexed two DMRS using two orthogonal codes of CDM schemes in a group in the case of MIMO.If pass through 1 bit group designator determines group, then can determine one of two orthogonal codes using the NDI (1 bit) for the code word forbidden. In addition, if carried out using 1 bit group designator on the determination using which group and enable two code words, then using two Individual orthogonal code, and therefore, there is no need to indicate orthogonal code.By limiting 1 bit group designator, can provide can be efficiently Support the Signalling method launched with most four layers of MU-MIMO.
Hereinafter, will describe a kind of using two code words and supporting in the system of maximum order N (N≤8) using same Control information form supports method that SU-MIMO and MU-MIMO launch.It will describe to wrap in such control information first The item included, the method that then description configures detailed control information form.
(1) as the control information for MIMO transmittings, sum of ranks precoding information is substantially needed.
(2) rank information indicates the quantity of the virtual-antenna (or stream or layer) for transmitting.Demodulated when using MIMO receiver During data, the quantity of the layer of data demodulation to be carried out is determined based on rank information.In terms of the viewpoint of individual layer, rank information can be claimed For " quantity for the layer to be received by a user ".If using MU-MIMO, transmitter can use multilayer to multiple receptions Device (several users) launches data.Therefore, in terms of the viewpoint of multiple users (or in terms of viewpoint of MU-MIMO transmitters), can Rank information to be referred to as " being used for all layers of the quantity launched ".
(3) information of the precoding information instruction on the precoding weighting of the signal transmitting for being carried out by transmitter.For Reduce the size of the indication bit for precoding weighting, it may be considered that weight for advance restricted code word type precoding And the method for reporting code book index corresponding with the precoding information for launching.Receiver can be by coupling on by sending out The information and data demodulation is performed by reference to the channel information of signal acquisition that the precoding of emitter instruction weights.Meanwhile Data of the DRS (Dedicated Reference Signal) (or demodulated reference signal) by same precoder precoding for transmitting.Therefore, if using use In the DRS (Dedicated Reference Signal) of specific user, then the information on precoding weighting is dependently transmitted.
(4) in the system using DRS (Dedicated Reference Signal), it substantially can only indicate that rank information is launched for MIMO.Example Such as, it is necessary to which 1 bit order designator indicates order in the system of the transmitting for performing maximum order 2.For performing maximum order 2 bit order designators are needed in the system of 4 transmitting, and 3 bits are needed in the system of the transmitting for performing maximum order 8 Order designator.
(5) following item can be considered in multiple codeword (MCW) transmitting.Multi-antenna transmission can be supported to use individual layer Transmitting and using multilayer transmitting.When performing transmitting using multilayer, different MCS may be used on layer.For to multilayer It can be referred to as MCW transmittings using multiple MCS transmitting.If MCS is applied to multilayer, signaling consumption can be increased, and And therefore, some of multilayer can be designed as with identical MCS.For example, in the system for launching two layers, each layer There can be different MCS.In the system for launching three layers, any one layer can be distributed to the MCS for layer, and Remaining two layers of MCS distribution that can be to the channel status for being suitable for two layers.It can be designed as with identical for this two layers MCS.Meanwhile for indicating that MCS bit can include MCS levels and code word forbids information.
(6) in the system for launching two code words, indicated when distributing two MCS to the control channel for transmitting Accord with (each MCS designators include the configured information that code word is forbidden) and any one MCS designator instruction code word is forbidden When, receiver, which can identify, does not launch a code word, but only launches another code word.In addition, if two MCS instructions Symbol indicates that specific MCS is horizontal, then receiver can identify two code words of transmitting.
(7) in the case of MCW transmittings are performed in the system for supporting the transmitting of maximum order 2, can use for every layer MCS designators.1 bit can be assigned as to the designator for launching order.However, in the transmitting of maximum order 2, even if ought be not When distributing the designator for launching order, according to whether enablement code word is sent out to be made regarding whether to perform individual layer transmitting or 2 layers The determination penetrated.If via each layer of each code word of transmitting, transmitting order can be met according to which enabled code word.Tool Say body, in the case of the transmitting that maximum order 2 is performed in the system with two code words, enabled only in the transmitting of order 1 One code word, and two code words are enabled in the transmitting of order 2.Therefore, wherein while multiple code words are supported In system via each layer of each code word of transmitting, because hair can be obtained via the information included in MCS designators Penetrate rank information, it is possible to dependently transmit rank information with signal.
(8) in the case of performing MIMO transmittings using DRS (Dedicated Reference Signal) (DRS or DMRS) wherein, for reference to letter Number orthogonal resource (diacritic resource) be equal to be used for MIMO transmitting floor quantity.For distinguishing (or identification) reference signal Orthogonal resource can be code resource, frequency resource and/or time resource.For example, in the case of the transmitting of order 2, for DRS (Dedicated Reference Signal) needs two orthogonal resources.However, sent out in MU-MIMO, it is necessary to quantitatively correspond to multiple users The orthogonal resource of the quantity for the layer penetrated is used for DRS (Dedicated Reference Signal).For example, the hair of order 2 is performed relative to two users wherein In the case of penetrating, it is used for DRS (Dedicated Reference Signal) using total of four orthogonal resource.
(9) in order to allow a receiver to the demodulated signal in the MU-MIMO using DRS (Dedicated Reference Signal), it is necessary to can distinguish Ground (identifiably) indicates the reference signal of multiple users.For example, when simultaneously to two user's transmission signals for execution order 1 Transmitting when, use two orthogonal resources.If setting the order of two orthogonal resources, need to each user notice with The order of orthogonal resource corresponding to its signal.
If all limiting DMRS groups indication bit, the order indication bit for SU-MIMO transmittings and for indicating to use In all layers of order indication bit of MU-MIMO transmittings, then the clear control information for MIMO transmittings, but signaling are provided Expense significantly increases.In the present invention, can support to reduce signaling consumption while SU-MIMO and MU-MIMO at the same time Efficient control information Signalling method is suggested as follows.
Embodiment 5
The present embodiment is related to a kind of indicate for the sum of ranks layer of the transmitting of the transmitting relative to order 1 and order 2 and configuration only The method for indicating the control information of transmitting rank information.
For example, in MU-MIMO transmittings, it is assumed that each receiver can receive most 2 layers, and each transmitter can be with Launch most four layers.In this case, it is necessary to which indication bit, the indication bit are used to distinguish (or identification) for participating in MU- Four layers of MIMO UE.In the case where application is used for the above-mentioned indicating means of MIMO transmittings, control information can be provided and caused Receiver identifies the state A to D of table 38.
Table 38
Table 39 shows the code word of maximum 8 layers transmitting to the example of layer mapping ruler.
Table 39
Code word shown in table 39 into layer mapping ruler, if enable a code word, can use order 1, 2nd, 3 or 4 launch data, and if enabling two code words, then launch data using order 2,3,4,5,6,7 or 8.Cause This, the restriction of the transmitting order as shown in table 40, expressed the quantity according to enabled code word.
Table 40
Table 40 shows to support the precoding information of 8 antenna ports.One to eight layer of instruction regarding from unique user of table 40 From the point of view of be used for launch data layer quantity., it is necessary to which minimum 3 bits indicate rank information as shown in table 40.Make wherein In the case of with 3 bits, if enabling a code word, four fields can be retained, and if enabling two code words, A field can then be retained.
In the case that order designator is used for the up to transmitting of order 4 wherein, 2 bits are used as order designator.Can be with Order designator configured 2 bits as shown in table 41.Table 41 shows to support the precoding information of four antenna ports.
Table 41
As shown in table 41, if enabling a code word, a field can be retained, and it is if enabled two Code word, then it can retain a field.
Meanwhile in the case of for the up to transmitting of order 2,1 bit can be used as order using order designator wherein Designator.Can be configured the order designator of 1 bit as shown in table 42.Table 42 shows to support the precoding of two antenna ports Information.
Table 42
As shown in table 42, in the case of performing transmitting by two antenna ports wherein, enabled if identified One code word, then the transmitting of order 1 is performed, and if enabling two code words, then perform the transmitting of order 2.Therefore, even if working as Operation can also be accurately carried out when not limiting the individual bit for indicating order.
Next, it is a kind of be used in precoding information field confining layers indicate method be suggested it is as follows.
MU-MIMO is being applied wherein in the transmitting of order 1 and 2 and in order 3 or bigger transmitting using SU-MIMO's In the case of, can be being configured to the precoding information fields of 8 antenna ports as shown in table 43.
Table 43
Meanwhile when enabling a code word, the MIMO transmittings of order 2,3 or 4 are possible.When an enabled code word When, two layers of group being assigned to can be indicated, to enable the transmittings of the MU-MIMO in the transmitting of order 2.In this case, may be used With the precoding information being configured to eight antenna ports as shown in table 44.
Table 44
In the case that UE carrys out demodulating data via DMRS wherein, it is assumed that RE maximum quantity is used for DMRS.For example, work as phase For any RE indicate DMRS CDM groups 1 when, can consideration in addition to for the RE of data and reference signal, for another Data demodulation is performed in the case of the RE positions (for example, DMRS CDM groups 2) that one UE DMRS is mapped to.It can consider The compiling rate of the information of transmitting is calculated in the case of DMRS RE maximum quantity, and can be conciliate according to compiling rate to encode Code information., can be in the case of the quantity for the RE for considering the transmitting for order 1 or 2 relative to the UE for belonging to DMRS CDM groups 1 Coding/decoding is performed (for example, wherein will be in the case that 24 RE are used for DMRS transmittings altogether, when the transmitting for performing order 1 or 2 When 12 RE are used only).
Meanwhile applying MU-MIMO wherein in the transmitting of order 1 and 2 and SU- is applied in order 3 or bigger transmitting In the case of MIMO, the precoding information field of four antenna ports can be configured to as shown in table 45.
Table 45
Meanwhile when enabling a code word, two layers of one group be assigned to can be indicated, to enable the hair in order 2 The MU-MIMO transmittings hit.In such a case it is possible to the precoding letter being configured to four antenna ports as shown in table 46 Breath.
Table 46
The precoding configured as shown in table 39 to 46 such as can be included in down link control information (DCI) form to believe Cease field.Precoding information field instruction will be reused in the control information included by DCI format proposed by the present invention Existing DCI format 2A " precoding information field ".That is, by control information proposed by the present invention have with existing DCI lattice The similar form of the form of " precoding information " that formula 2A includes, and if only enable a code word or if enabled two Individual code word then substantially indicates the group belonging to for the layer (or antenna port) of transmitting transmitting sum of ranks data.Therefore, Ke Yigai Become term control information.For example, the control information shown in table 39 to 46 can be by existing DCI format proposed by the present invention The control for indicating the group belonging to transmitting sum of ranks layer is included as in the DCI format proposed in the DCI format of 2A modification or newly Information processed.
Embodiment 6
The present embodiment is related to when instruction is used for the sum of ranks layer of the transmitting of the transmitting relative to order 1 and order 2 and indicates relative Control information is configured when the application MU-MIMO in same CDM groups in the case of order 3 or the transmitting rank information of bigger transmitting Method.Launching using expression in same CDM groups (for example, Fig. 8 (a) " C ") for MU-MIMO in same CDM groups is used for The DRS (Dedicated Reference Signal) of one or more layers of multiple users.
For example, in same CDM groups in the MU-MIMO transmittings of application, it is assumed that each receiver can receive 2 layers of maximum, And transmitter can launch most four layers.In this case, it is necessary to which indication bit, is used to participate in for distinguishing (or identification) Four layers of MU-MIMO UE.In the case where launching the above-mentioned indicating means of application for MIMO, control information can be provided, made Obtain the state A to D of receiver identification table 47.Although performing MU-MIMO transmittings in group 1 in table 47, this is to be used to appoint Meaning group, and therefore, the invention is not restricted to this.
Table 47
Four layers of the DRS (Dedicated Reference Signal) that predetermined group can be belonged to using four orthogonal codes to distinguish (or identification) to be used for.Can So that four orthogonal codes are divided into two subgroups (for example, A subgroups and B subgroups shown in table 47).For example, can be by one Group is divided into two subgroups, and two subgroups are accurate orthogonal each other.The complete orthogonal sequence in a subgroup can be used To distinguish two layers of (or identification).Orthogonal code for each layer can be determined according to DMRS antenna terminal mapping rule.
It is assumed that applying MU-MIMO in the transmitting of order 1 and 2, SU-MIMO is applied in order 3 or bigger transmitting, and only MU-MIMO is performed in one group (for example, group 1).In this case, the quantity for DMRS RE can be limited to 12.Therefore, may be used With the precoding information field being configured to 8 antenna ports as shown in table 48.
Table 48
Meanwhile when enabling a code word, the MIMO transmittings of order 2,3 or 4 are possible.When an enabled code word When, two layers of subgroup being assigned to can be indicated, to enable the transmittings of the MU-MIMO in the transmitting of order 2.In this case, , can be being configured to eight antenna ports as shown in table 49 in view of the situation of the application MU-MIMO wherein in predetermined group Precoding information.
Table 49
UE can be performed in the case of the quantity for the RE for considering the transmitting for order 1 or order 2 coding/decoding (for example, In the case that wherein 24 RE are used for DMRS transmittings altogether, only 12 RE are used when performing the transmitting of order 1 or 2).
Meanwhile MU-MIMO and in order 3 or big-and-middle using SU-MIMO's is being applied wherein in the transmitting of order 1 and 2 In the case of, considering wherein in predetermined group in the case of application MU-MIMO, can be being configured to four as shown in table 50 The precoding information field of antenna port.
Table 50
Meanwhile when enabling a code word, two layers of group being assigned to can be indicated, so that in the transmitting of order 2 In MU-MIMO transmitting.In this case, considering wherein in predetermined group in the case of application MU-MIMO, can be such as in table The precoding information of four antenna ports is configured to shown in 51.
Table 51
The precoding configured as shown in table 48 to 51 such as can be included in down link control information (DCI) form to believe Cease field.Precoding information field instruction will be reused in the control information included by DCI format proposed by the present invention Existing DCI format 2A " precoding information field ".That is, by control information proposed by the present invention have with existing DCI lattice The similar form of the form of " precoding information " that formula 2A includes, and if as described above, only enable a code word or If enabling two code words, the son belonging to for the layer (or antenna port) of transmitting transmitting sum of ranks data is substantially indicated Group.Therefore, thus it is possible to vary term control information.For example, the control information shown in table 48 to 51 can carry by the present invention It is included as being used to indicate transmitting sum of ranks in the DCI format proposed in the DCI format of the existing DCI format 2A gone out modification or newly The control information of subgroup belonging to layer.
In the case where wherein indicating for the group belonging to UE MIMO emission layers as in embodiment 5, can make Two OCC in group distinguish (or identification) layer.If launching a code word, the code word forbidden can be used NDI bits obtain the OCC information of antenna port, layer number or enabled code word., can be with if enabling two code words Use available two OCC resources in group.
, can be with the case where wherein indicating for the subgroup belonging to UE MIMO emission layers as in embodiment 6 (or identification) layer is distinguished using two OCC in subgroup.If launching a code word, the code forbidden can be used The NDI bits of word obtain the OCC information of antenna port, layer number or enabled code word.If enabling two code words, Available two OCC resources in subgroup can be used.
It will be described with reference to Figure 10 in the wireless communication system according to embodiments of the present invention launched in support MIMO and launch With the method for receiving down link signal.Figure 10 downlink transmitter (for example, base station) can be via eight transmitting antennas To launch down link signal, and downlink receiver (for example, UE) can receive descending chain from downlink transmitter Road signal.In addition, downlink transmitter can be the repeater for launching access downlink signal to UE, and it is descending Link receiver can be the repeater for receiving backhaul down link signal from base station.
In step S1010, downlink transmitter can launch down link control information.Then, in step S1030 In, downlink receiver can receive down link control information.Down link control information can be used to dispatch in N (1 ≤ N≤8) information of down link data launched on layer.It can be believed with PDCCH DCI formats to launch downlink control Breath.
In step S1020, downlink transmitter can based on step S1010 down link control information transmitting, The down link data and UE specific reference signals (or DMRS) launched on N layers.Under being multiplexed and launching on PDSCH Uplink data and UE specific reference signals.Then, in step S1040, downlink receiver can receive downlink Data and UE specific reference signals.
In step S1050, downlink receiver can demodulate what is launched on N layers based on UE specific reference signals Down link data.
Down link control information can wherein only enable a code word in the case of or wherein enable two generations Include the information for being used for schedule downlink MIMO transmittings in the case of code word.Down link control information can include being used to refer to Show the quantity N for the layer that enabled code word is mapped to information.If downlink transmitter includes 8 transmitting antennas, 1 ≤N≤8.If more specifically, only enabling a code word, 1 to 4 layer of transmitting can be performed, and it is if enabled two Code word, then it can perform 2 to 8 layers of transmitting.The quantity of layer can indicate order.For example, down link control information can wrap Include the control information shown in table 40 to 44 or table 48 to 51.
The information of quantity for indicating the layer in down link control information can be included on for identifying UE spies Determine the information of the code of reference signal, i.e. for distinguishing the information in the UE specific reference signals of same RE opening positions transmitting.Example Such as, as in Fig. 8 (a) reference signal group " C ", same RE opening positions hair can be included in a reference signal group The four different UE specific reference signals penetrated, it can be incited somebody to action by the information on the code for identifying UE specific reference signals One is divided into two subgroups with reference to group, also, a subgroup can include two UE by orthogonal code division with particular reference to letter Number.For example, as shown in table 48, the information for the quantity of marker can have 3 bits, and relative to wherein by one Codeword mappings are to one layer and for two codeword mappings to two layers of situation, can will include being used for marker institute together The information (that is, the information for indicating to be used to identify the code of UE specific reference signals) of the subgroup of category.In addition, downlink control Information processed may further include the information for indicating downlink link MIMO transmit antenna ports.
Item described in superincumbent each embodiment of the invention (that is, is matched somebody with somebody by various DCI formats proposed by the present invention Put method) it is equally applicable to the transmitting of the invention described with reference to figure 10 and the method for receiving down link signal.For example, as In embodiment 5 and 6 like that, in the system of MIMO transmittings of maximum order 8 is supported, for relative to each UE based on In the configuration of the DCI format of DMRS data transmitting, using for configure control information so as to and meanwhile support SU-MIMO and MU- MIMO (that is, using a DCI format) method.Such information can include at least one in following information：For referring to Show the information of the group (that is, reference signal position) belonging to the DRS (Dedicated Reference Signal) distributed to UE, the transmitting order (layer for indicating UE Quantity) information, the information of the information for indicating total transmitting order and the emission layer for indicating UE.For indicating to send out The DRS (Dedicated Reference Signal) that (or identification) is used to demodulate the data via layer (and antenna port) transmitting can be distinguished by penetrating the information of layer And for demodulating the DRS (Dedicated Reference Signal) of the data via another layer of transmitting.Can be by DCI format 1A proposed by the present invention Modification form and new DCI format include such control information.
Figure 11 is the figure according to the base station 1110 of the exemplary embodiment of the present invention and UE 1120 configuration.
Referring to Figure 11, receiving module 1111, transmitter module 1112, processor can be included according to the base station 1110 of the present invention 1113rd, memory 1114 and multiple antennas 1115.The use of the plurality of antenna 1115 represents that MIMO transmittings are supported in base station.Receive mould Block 1111 can receive multiple signals, data and information from UE in the downlink.Transmitter module 1112 can be up Launch multiple signal, data and information to UE in link.Processor 1113 can be with the integrated operation of control base station 1110.
Base station 1110 according to an embodiment of the invention can support the wireless communication system of downlink mimo transmitting Middle operation, and support SU-MIMO or MU-MIMO to launch.The processor 1113 of base station 1110 may be configured to pass through transmitting Module 1112 launches down link control information, and the down link control information includes being used for indicating downlink link MIMO launching The information of the quantity of layer that is mapped to of one or two enabled code word.The processor 1113 of base station 1110 can by with It is set to based on down link control information, the downlink launched on one or more layers is launched by receiving module 1111 The DMRS of data and one or more layers.Information for the quantity of marker may further include on for identifying The information of DMRS code.
The processor 1113 of base station 1110 handles the information received from base station 1110 and the letter to launch to external device (ED) The information of processing is stored the scheduled time by breath, and memory 1114, and could alternatively be such as buffer (not shown) Component.
Referring to Figure 11, receiving module 1121, transmitter module 1122, processor can be included according to the UE 1120 of the present invention 1123rd, memory 1124 and multiple antennas 1125.The use of the plurality of antenna 1125 represents that UE supports MIMO transmittings.Receiving module 1121 can receive multiple signals, data and information from base station in the downlink.Transmitter module 1122 can be up To the multiple signals of Base Transmitter, data and information in link.Processor 1123 can be with the integrated operation of control base station 1120.
Base station 1120 according to an embodiment of the invention can support the wireless communication system of downlink mimo transmitting Middle operation.The processor 1123 of base station 1120 may be configured to receive down link control information by receiving module 1121, One or two enabled code word that the down link control information includes being used for indicating downlink link MIMO transmittings is mapped The information of the quantity of the layer arrived.The processor 1123 of base station 1120 is configured to down link control information, passed through Receiving module 1121 receives the DMRS of the down link data launched on one or more layers and one or more layers. Information for the quantity of marker may further include the information on the code for identifying DMRS.
The processor 1123 of base station 1120 handles the information received from base station 1120 and the letter to launch to external device (ED) Breath, and the information of processing is stored the scheduled time by memory 1124, and could alternatively be such as buffer (not shown) Component.
In the wireless communication system for supporting multiple operators, item below is jointly applied to from UE 1120 to base Stand 1110 uplink control information transmitting.Information on the code for identifying DMRS can be distinguished in same RE positions The DMRS of place's transmitting is put, and can be only when a code word is mapped to one layer and when two code words are mapped to two It is included in during layer in the information for the quantity of marker.Same RE opening positions transmitting four different UE with particular reference to Signal can be included in a DMRS group, and by the information on the code for identifying DMRS by a DMRS group Two subgroups are divided into, and a subgroup is included by two DMRS of orthogonal code division.In addition, down link control information can To further comprise the information of the antenna port for indicating downlink link MIMO transmittings.Information for the quantity of marker can With with 3 bits.
Can be by being equally applicable in the item described in each embodiment of the present invention (that is, by proposed by the present invention Various DCI format collocation methods) realize the detailed configuration of base station or UE.
In Figure 11 description, the description of base station 1110 is equally applicable to as downlink transmitter and up-link The RN of receiver, and UE 1120 explanation is equally applicable to as downlink receiver or uplink transmitter RN。
Embodiments of the invention can be realized by such as hardware, firmware, software or the various means of its combination.
In the case where realizing the present invention by hardware, application specific integrated circuit (ASIC) can be used, at data signal Manage device (DSP), digital signal processing device (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), Processor, controller, microcontroller, microprocessor etc. realize the present invention.
, can be with such as module, process, function if realizing the operation of the present invention or function by firmware or software Deng the forms of various forms realize the present invention.Software code can be stored in memory cell so that it can be by Processor drives.Memory cell is located inside or outside processor so that it can via a variety of conventional partials with it is above-mentioned Processor is communicated.
The detailed description of the exemplary embodiment of the present invention is had been presented for, to enable those skilled in the art Realize and implement the present invention.Although describe the present invention, those skilled in the art by reference to exemplary embodiment It will be appreciated that in the case of without departing from the spirit and scope of the present invention described in the appended claims, can be at this Various modifications and changes are carried out in invention.For example, those skilled in the art can use superincumbent reality in combination with each other Apply each construction illustrated in example.Therefore, the present invention is not limited to specific embodiments described herein, but should meet with The principle disclosed herein widest range consistent with novel feature.
Above-described embodiment is realized by the combination of structural detail and feature of the invention in a predefined manner.It should select Consider to property it is each in structural detail and feature, unless independently specifying.Can perform it is each in structural detail or feature, Without with other structures element or combinations of features.In addition, some structural details and/or feature can be combined with each other, to form this The embodiment of invention.The order of the operation described in an embodiment of the present invention can be changed.Some structures of one embodiment Element or feature can be included in another embodiment, or may alternatively be the corresponding structure of another embodiment Element or feature.It should be further understood that some claims for quoting specific rights requirement can be with quoting except the specific rights will Other claim combinations of other claims outside asking, with by submit apply after modification come formed embodiment or Increase new claim.
【Industrial usability】
The above embodiment of the present invention is applied to support the various GSMs of MIMO transmittings.

Claims (5)

1. a kind of be used to receive down link signal from base station in the wireless communication system for supporting multiple-input, multiple-output MIMO transmittings Method, methods described are performed by user equipment (UE), and including：
The down link control information for including the field for indicating a state in multiple states is received, in the multiple state One state indicates respectively the quantity N of the layer of one or two the enabled code word that have mapped downlink mimo transmitting, 1≤ N≤8；And
Down link data is received based on the down link control information,
Wherein, when a code word is enabled, a state of the quantity of marker is 1,2,3 or 4, and the instruction layer Quantity be that 1 state further indicates to identify that the UE specific reference signals are used to demodulate the down link data each other Different information, and
Wherein, when two code words are enabled, a state for indicating the quantity of the layer is 2,3,4,5,6,7 or 8, and The quantity for indicating the layer is that 2 state further indicates to identify that the UE specific reference signals are used to demodulate the downlink The information different from each other of data.
2. according to the method for claim 1, wherein, the field is made up of 3 bits.
3. a kind of be used to launch downlink to user equipment (UE) in the wireless communication system for supporting multiple-input, multiple-output MIMO transmittings The method of signal, methods described by base station perform and including：
Transmitting includes the down link control information for the field for indicating a state in multiple states, in the multiple state One state indicates respectively the quantity N of the layer of one or two the enabled code word that have mapped downlink mimo transmitting, 1≤ N≤8；And
Based on the down link control information transmitting down link data,
Wherein, when a code word is enabled, a state of the quantity of marker is 1,2,3 or 4, and the instruction layer Quantity be that 1 state further indicates to identify that the UE specific reference signals are used to demodulate the down link data each other Different information, and
Wherein, when two code words are enabled, a state for indicating the quantity of the layer is 2,3,4,5,6,7 or 8, and The quantity for indicating the layer is that 2 states further indicate to identify that the UE specific reference signals are used to demodulate the downlink number According to information different from each other.
4. a kind of user equipment (UE), the UE is used to connect from base station in the wireless communication system for supporting multiple-input, multiple-output MIMO transmittings Downlink signal is accepted, the UE includes：
Receiving module, the receiving module are configured to receive down link signal from the base station；
Transmitter module, the transmitter module are configured to the Base Transmitter uplink signal；And
Processor, the processor, which is configured to control, includes the UE of the receiving module and the transmitter module,
Wherein, the processor is configured to：By the receiving module, receive comprising the state indicated in multiple states Field down link control information, a state in the multiple state, which indicates respectively, have mapped downlink mimo hair The quantity N of the layer of one or two the enabled code word penetrated, 1≤N≤8；And led to based on the down link control information Cross the receiving module and receive down link data；
Wherein, when a code word is enabled, a state of the quantity of marker is 1,2,3 or 4, and the instruction layer Quantity be that 1 state further indicates to identify that the UE specific reference signals are used to demodulate the down link data each other Different information, and
Wherein, when two code words are enabled, a state for indicating the quantity of the layer is 2,3,4,5,6,7 or 8, and The quantity for indicating the layer is that 2 state further indicates to identify that the UE specific reference signals are used to demodulate the downlink The information different from each other of data.
5. a kind of base station, the base station is used in the wireless communication system for supporting multiple-input, multiple-output MIMO transmittings to user equipment (UE) Launch down link signal, the base station includes：
Receiving module, the receiving module are configured to receive uplink signal from the UE；
Transmitter module, the transmitter module are configured to launch down link signal to the UE；And
Processor, the processor, which is configured to control, includes the base station of the receiving module and the transmitter module,
Wherein, the processor is configured to：By the transmitter module, transmitting includes the state indicated in multiple states Field down link control information, a state in the multiple state, which indicates respectively, have mapped downlink mimo hair The quantity N of the layer of one or two the enabled code word penetrated, 1≤N≤8；And led to based on the down link control information Cross the transmitter module transmitting down link data；
Wherein, when a code word is enabled, a state of the quantity of marker is 1,2,3 or 4, and the instruction layer Quantity be that 1 state further indicates to identify that the UE specific reference signals are used to demodulate the down link data each other Different information, and
Wherein, when two code words are enabled, a state for indicating the quantity of the layer is 2,3,4,5,6,7 or 8, and The quantity for indicating the layer is that 2 state further indicates to identify that the UE specific reference signals are used to demodulate the downlink The information different from each other of data.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10856280B2 (en) 2017-03-15 2020-12-01 Samsung Electronics Co., Ltd. Method and apparatus for downlink control information design for network coordination
KR102539594B1 (en) * 2017-03-15 2023-06-05 삼성전자주식회사 Method and apparatus for downlink control information design for network coordination
CN110166200A (en) 2018-02-13 2019-08-23 华为技术有限公司 The method and relevant apparatus of number of resource units are known in communication process
CN109076477B (en) * 2018-07-11 2021-01-01 北京小米移动软件有限公司 Method and device for sending and receiving reference signal, base station and user equipment
US20210321404A1 (en) * 2020-04-10 2021-10-14 Qualcomm Incorporated Demodulation reference signal grouping for full duplex wireless communications

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005125140A1 (en) * 2004-06-18 2005-12-29 Samsung Electronics Co., Ltd Apparatus and method for space-frequency block coding/decoding in a communication system
WO2008111798A1 (en) * 2007-03-12 2008-09-18 Lg Electronics Inc. Method for transmitting control information in multiple antenna system
CN101605375A (en) * 2008-06-11 2009-12-16 大唐移动通信设备有限公司 Signaling method on a kind of down control channel
CN101615937A (en) * 2008-06-27 2009-12-30 中兴通讯股份有限公司 A kind of multi-antenna emission method and many antennas emitter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7916621B2 (en) * 2007-02-05 2011-03-29 Samsung Electronics Co., Ltd. MIMO control signaling in a wireless communication system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005125140A1 (en) * 2004-06-18 2005-12-29 Samsung Electronics Co., Ltd Apparatus and method for space-frequency block coding/decoding in a communication system
WO2008111798A1 (en) * 2007-03-12 2008-09-18 Lg Electronics Inc. Method for transmitting control information in multiple antenna system
CN101605375A (en) * 2008-06-11 2009-12-16 大唐移动通信设备有限公司 Signaling method on a kind of down control channel
CN101615937A (en) * 2008-06-27 2009-12-30 中兴通讯股份有限公司 A kind of multi-antenna emission method and many antennas emitter

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