CN109075828A

CN109075828A - For realizing the method and apparatus of uplink MIMO

Info

Publication number: CN109075828A
Application number: CN201780026321.0A
Authority: CN
Inventors: 埃科·昂高萨努斯; 麦德·赛弗·拉赫曼; 阿里斯·帕帕萨克拉里欧; 黄文隆
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2016-04-26
Filing date: 2017-04-26
Publication date: 2018-12-21
Anticipated expiration: 2037-04-26
Also published as: CN109075828B; KR102587760B1; EP3449579A4; EP3449579A2; WO2017188736A3; WO2017188736A2; KR20220156098A; CN116346179A; KR20180129875A

Abstract

This disclosure relates to be supplied for supporting to be more than such as pre- 5th generation (5G) of the more high data rate of forth generation (4G) communication system of long term evolution (LTE) or 5G communication system.Provide the method and apparatus for realizing uplink multiple-input and multiple-output (MIMO).User equipment (UE) includes transceiver and the processor for being operably connected to transceiver.Transceiver is configured to receive the UL license for uplink (UL) transmission.Processor is configured to be decoded the precoding information field in down link control information (DCI) associated with UL license.Precoding information field includes at least one precoding matrix indicators (PMI) corresponding with multiple precoders.Transceiver is configured to carry out precoding to data stream according to the precoder indicated by precoding information field, and by the data flow through precoding in UL channel.

Description

For realizing the method and apparatus of uplink MIMO

Technical field

In order to meet the increased demand to wireless data traffic since the deployment of 4G (the 4th generation) communication system, It is dedicated to developing improved 5G (the 5th generation) or pre- 5G communication system.Therefore, 5G or pre- 5G communication system are also referred to as " super 4G net Network " or " rear LTE system ".

Think that 5G communication system will be realized with millimeter wave (mmWave) frequency band (for example, 60GHz frequency band), it is higher to realize Data rate.In order to reduce the propagation loss of radio wave and increase transmission range, wave beam shape is discussed in 5G communication system At technology, extensive multiple-input and multiple-output (MIMO) technology, MIMO (FD-MIMO) technology, array antenna technique, analog wave are tieed up entirely Beam forms technology, extensive antenna technology.

In addition, being based on high grade small honeycomb, cloud radio access network (RAN), super-intensive in 5G communication system Network, device-to-device (D2D) communication, wireless backhaul, mobile network, collaboration communication, cooperative multi-point (CoMP), receiving end interference Grid improvement is researched and developed in elimination etc..

In 5G system, developed as higher level code modulation (ACM) mixing FSK and QAM modulation (FQAM) and Sliding window supercomposed coding (SWSC) and filter bank multi-carrier (FBMC), non-orthogonal multiple as advanced access technology (NOMA) and Sparse Code multiple access (SCMA).

The disclosure relates generally to the methods for realizing uplink multiple-input and multiple-output (MIMO).When user equipment is matched When having multiple transmission antennas and transmission-reception unit, these methods can be used.

Background technique

Wireless communication has been one of most successful innovation on modern history.Since smart phone and other mobile datas are set The consumer of standby (equipment of such as tablet computer, " notepad " computer, net book, E-book reader and machine type) It increases sharply with the demand of becoming increasingly popular for enterprise, wireless data traffic.In order to meet high growth and the branch of mobile data flow New application and deployment are held, the improvement of radio interface efficiency and coverage area is vital.

Mobile device or user equipment can measure the quality of downlink channel and by the quality report to base station, so as to energy Whether enough determinations should adjust various parameters with during mobile device communication.Existing channel quality report in wireless communication system Accuse undertreatment with adapt to large-scale two-dimensional array transmission antenna or be commonly available to accommodate the antenna array of a large amount of antenna elements The associated channel state information of column geometry is reported.

Summary of the invention

Each embodiment of the disclosure provides the method and apparatus for being used for CSI report.

In one embodiment, user equipment (UE) is provided.UE includes transceiver and is operably connected to transmitting-receiving The processor of device.Transceiver is configured to receive the UL license for uplink (UL) transmission.Processor is configured to be permitted with UL Can the precoding information field in associated down link control information (DCI) be decoded.Precoding information field includes At least one precoding matrix indicators (PMI) corresponding with multiple precoders.Transceiver is configured to according to by precoding The precoder of information field instruction carries out precoding to data stream, and by the data flow through precoding in UL channel.

In another embodiment, a kind of base station (BS) is provided.BS includes processor and is operably connected to processing The transceiver of device.Processor is configured to generate precoding information field in DCI, and generates and permitted for the UL transmitted of the UL to UE It can.Transceiver is configured to permit via downlink (DL) channel to UE transmission UL.DCI is associated with UL license, and prelists Code information field includes at least one PMI corresponding with multiple precoders.

In another embodiment, the method for operating UE is provided.This method includes being received to transmit for UL by UE UL license.This method further includes permitting the precoding information field in associated DCI to be decoded with UL by UE pairs, In, precoding information field includes at least one PMI corresponding with multiple precoders.This method further includes by UE according to by pre- The precoder of Encoded Information field instruction carries out precoding to data stream.This method further includes being passed through by UE in UL channel The data flow of precoding.

In another embodiment, the method for operating base station (BS) is provided.This method comprises: in downlink control Precoding information field is generated in information (DCI) processed；Generate the UL transmitted for the uplink (UL) to user equipment (UE) License；And UL license is sent to UE via downlink (DL) channel, wherein DCI is associated with UL license, and precoding Information field includes at least one precoding matrix indicators (PMI) corresponding with multiple precoders.

This disclosure relates to be supplied for supporting to be more than the higher of such as forth generation (4G) communication system of long term evolution (LTE) Pre- 5th generation (5G) of data rate or 5G communication system.

By the following drawings, description and claims, those skilled in the art can easily clearly other technical characteristics.

Before undertaking the detailed description of the invention below, to certain word and expressions used in entire this patent document into Row definition may be advantageous.Wording " connection " and its derivative words refer between two or more elements it is any directly or Connect letter, no matter those elements whether physical contact with one another.Wording " transmission ", " reception " and " communication " and its derivative words include straight Connect both letter and indirect communication.Wording " including (include) " and " including (comprise) " and its derivative words mean Rather than it limits.Wording "or" is inclusiveness, mean and/or.Phrase " with ... it is associated " and its derivative words mean to wrap Include, be included in ... it is interior, with ... interconnect, include, be included in ... it is interior, be connected to or with ... be connected or coupled to or with ... connection Connect, with ... can exchange, with ... cooperate, interlock, juxtaposition, close to, be adhered to or with ... bond, have, have ... attribute, With relationship or with ... relationship or the like.Term " controller " means to control any equipment, the system of at least one operation Or part thereof.This equipment can realize the combination for hardware or hardware and software and/or firmware.It is related to any specific controller The function of connection can be to be centralized or distributed, and either local is still long-range.Phrase "at least one" with a list Mean to can be used the various combination of one or more of listed item when mesh is used together, and can only need in the column one A project.For example, " at least one of A, B and C " include it is following combination any one of: A, B, C, A and B, A and C, B and C with And A and B and C.

In addition, various function described below can be realized or be supported by one or more computer programs, it is one or more Each of computer program is formed by computer readable program code and is implemented with computer-readable medium.Term " application " " program " refers to the one or more computer programs for being suitable for realizing with code in suitable computer-readable program, software portion Part, instruction set, processing, function, object, classification, example, related data or their a part.Phrase " computer-readable program Code " includes any kind of computer code, including source code, object code and executable code.Phrase is " computer-readable Medium " includes any kind of medium that can be accessed by a computer, such as read-only memory (ROM), random access memory (RAM), the memory of hard disk drive, CD (CD), digital video disk (DVD) or any other type." non-transitory " Computer-readable medium eliminates the instantaneous electric signal of transmission or the wired, wireless of other signals, optics or other communication links.It is non- Temporary computer-readable medium includes being permanently stored in medium therein for data and being stored therein for data and slightly The medium being written over afterwards, such as rewritable CD or erasable memory equipment.

The definition to certain words and phrase is provided in entire this patent document.Those of ordinary skill in the art should manage Solution, in many cases, if not majority of case, it is this definition be suitable for these definition word and expressions it is previous with And the use in future.

Detailed description of the invention

It in order to which the disclosure and its advantage is more fully understood, is described below referring now in conjunction with attached drawing, wherein attached Identical appended drawing reference indicates identical part in figure:

Fig. 1 shows the example wireless network according to the various embodiments of the disclosure；

Fig. 2A and Fig. 2 B shows the example wireless transmitting path and wireless receiving according to the various embodiments of the disclosure Path；

Fig. 3 A shows the illustrative user device according to the various embodiments of the disclosure；

Fig. 3 B shows the exemplary base (BS) according to the various embodiments of the disclosure；

Fig. 4 shows exemplary beams forming framework, and one of port CSI-RS, which is mapped to, largely simulates controlled day Thread elements；

Fig. 5 shows the exemplary operation of dynamic and half dynamic precoding transmissions according to disclosure embodiment；

Fig. 6 show exemplary downlink (DL) signaling according to disclosure embodiment for subband precoding and For explaining that the UE of precoding information DCI field is handled；

Fig. 7 is shown according to some embodiments of the disclosure for supporting several exemplary DL signalings of subband precoding Scheme；

Fig. 8 is shown according to disclosure embodiment for supporting the another exemplary DL signaling side of subband precoding Case；

Fig. 9 shows the flow chart of the illustrative methods according to disclosure embodiment, and wherein UE is received transmits for UL UL license, for UL transmission UL license include precoding information field associated with multiple precoders.

Figure 10 shows the flow chart of the illustrative methods according to disclosure embodiment, and wherein BS, which is generated, has for UE The precoding information field of at least one PMI of (being labeled as UE-k).

Specific embodiment

The various embodiment party of Fig. 1 discussed below to Figure 10 and the principle for describing the disclosure in this patent document Formula is exemplary only, and should not be construed as in any way limiting the scope of the present disclosure.It will be understood by those skilled in the art that The principle of the disclosure can be realized in any wireless communication system suitably arranged.

One known word list

2D: two dimension

MIMO: multiple-input and multiple-output

SU-MIMO: Single User MIMO

MU-MIMO: multiuser MIMO

3GPP: third generation partner program

LTE: long term evolution

UE: user equipment

ENB: evolution node B or " eNB "

BS: base station

DL: downlink

UL: uplink

CRS: cell-specific reference signal

DMRS: demodulation reference signal

SRS: value detects reference signal

UE-RS:UE special datum signal

CSI-RS: channel state information reference signal

SCID: scrambling identity

MCS: modulation and encoding scheme

RE: resource element

CQI: channel quality information

PMI: precoding matrix indicators

RI: order designator

MU-CQI: multi-user CQI

CSI: channel state information

CSI-IM:CSI interference measurement

CoMP: coordinating multiple points

DCI: down link control information

UCI: uplink control information

PDSCH: physical down link sharing channel

PDCCH: physical downlink control channel

PUSCH: physical uplink shared channel

PUCCH: physical uplink control channel

PRB: Physical Resource Block

RRC: radio resource control

AoA: angle of arrival

AoD: angle of setting out

Following file and standard description are equally incorporated herein by reference as illustrated herein completely: 3GPP skill 36.211 version 12.4.0 of art specification (TS), " E-UTRA, physical channel and modulation " (" reference 1 ")；3GPP TS 36.212 editions This 12.3.0, " E-UTRA, multiplexing and channel coding " (" reference 2 ")；36.213 version 12.4.0 of 3GPP TS, " E- UTRA, physical layer process " (" reference 3 ")；36.321 version 12.4.0 of 3GPP TS, " E-UTRA, media access control (MAC) Protocol specification " (" reference 4 ")；And 3GPP TS36.331 version 12.4.0, " E-UTRA, radio resource control (RRC) association View specification " (" reference 5 ").

Fig. 1 shows the example wireless network 100 according to the various embodiments of the disclosure.Wireless network shown in Fig. 1 The embodiment of network 100 is merely to illustrate.Without departing from the scope of the present disclosure, its of wireless network 100 can be used Its embodiment.

Wireless network 100 includes base station (BS) 101, BS 102 and BS 103.BS 101 is communicated with BS 102 and BS 103. BS 101 also at least one Internet Protocol (IP) network 130 (such as internet, proprietary IP network or other data networks) Communication.Instead of " BS ", it is possible to use such as substituting term of " eNB " (enhancing node B) or " gNB " (universal nodes B).According to Other well-known terms can be used to replace " gNB " or " BS ", such as " base station " or " access point " in network type.For side Just for the sake of, term " gNB " and " BS " are in this patent document using to refer to the network base provided to the wireless access of remote terminal Infrastructure component.In addition, according to network type, other well-known terms can be used to replace " user equipment " or " UE ", Such as " movement station ", " subscriber station ", " remote terminal ", " wireless terminal " or " user apparatus ".For convenience, term " user Equipment " and " UE " are using the remote radio equipment to refer to wireless access gNB in this patent document, and no matter UE is mobile device (such as mobile phone or smart phone) is still typically considered fixed equipment (such as desktop computer or automatic vending Machine).

GNB 102 is that more than first a user equipmenies (UE) in the overlay area 120 of gNB 102 are provided to network 130 Wireless broadband Internet access.A UE more than first includes the UE 111 that can be located in small business (SB)；It can be located in business organization (E) UE 112；The UE 113 that can be located in Wi-Fi hotspot (HS)；The UE 114 that can be located in the first house (R)；Second can be located to live UE 115 in residence (R)；It and can be the UE of mobile device (M) (such as mobile phone, wireless notebook computers, wireless PDA) 116.GNB 103 provides the wireless broadband Internet access to network 130 for more than second a UE in the overlay area 125 of gNB 103.The A UE more than two includes UE 115 and UE 116.In some embodiments, one or more of gNB 101 to gNB 103 can It is communicated with one another using 5G, LTE, LTE-A, WiMAX or other Advanced wireless communication technologies and is communicated with UE 111 to UE 116.

Dotted line shows the approximate range of overlay area 120 and 125, wherein in order to illustrate the purpose with explanation, the substantially model Enclose be shown as it is approximate circle.It will be clearly understood that depending on the configuration of gNB and relevant to nature and artificial obstacle wireless The variation of electrical environment, overlay area (such as overlay area 120 and 125) associated with gNB can have other shapes, including not advise Then shape.

As described in more detail below, the one or more in gNB 101, gNB 102 and gNB 103 is to UE 111 to UE 116 transmission measurement reference signals, and UE 111 to UE 116 is disposed for CSI report, in disclosure embodiment It is described.In various embodiments, one or more receive in UE 111 to UE 116 is believed in uplink license The transmission plan or precoding information of order simultaneously correspondingly transmit.

Although Fig. 1 shows an example of wireless network 100, various changes can be carried out to Fig. 1.For example, wireless It includes any number of gNB and any number of UE that network 100, which any suitable can be arranged,.In addition, gNB 101 can directly with Any number of UE communication, and the wireless broadband Internet access to network 130 is provided to those UE.Similarly, gNB 102 to gNB Each of 103 can directly communicate with network 130, and provide the direct wireless broadband Internet access to network 130 to UE.In addition, GNB 101, gNB 102 and/or gNB 103 can provide to other or additional external network (such as external telephone network or other The data network of type) access.

Fig. 2A and Fig. 2 B shows example wireless transmitting path and wireless receiving path according to the disclosure.Following In description, transmitting path 200 can be described as be in gNB (such as gNB 102) and realize, and RX path 250 can be described as be in It is realized in UE (such as UE 116).However, it should be understood that RX path 250 can be realized in gNB, and transmitting path 200 can be in UE Middle realization.In some embodiments, as described in disclosure embodiment, RX path 250 is configured to receive in uplink It the transmission plan of signaling or precoded signal and is correspondingly transmitted in the license of road.

Transmitting path 200 include Channel Coding and Modulation block 205, serial-to-parallel (S to P) block 210, N size it is inverse fastly Fast Fourier transformation (IFFT) block 215, parallel-to-serial (P to S) block 220, addition cyclic prefix block 225 and up converter (UC) 230.RX path 250 includes downconverter (DC) 255, removal cyclic prefix block 260, serial-to-parallel (S to P) block 265, N Fast Fourier Transform (FFT) (FFT) block 270, parallel-to-serial (P to S) block 275 and the channel decoding of size and demodulation block 280.

In transmitting path 200, Channel Coding and Modulation block 205 receives a group information bit, (such as rolls up using coding Product, turbine or low-density checksum (LDPC) coding), and input bit is modulated and (such as uses quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM)), to generate frequency domain modulation symbols sequence.It serial-to-parallel piece 210 will serially modulate Sign reversing (as demultiplexed) is parallel data, to generate N number of parallel symbol stream, wherein N is in gNB 102 and UE 116 The IFFT/FFT size used.The IFFT block 215 of N size executes IFFT operation to N number of parallel symbol stream to generate time domain output Signal.The parallel time domain output symbol of the parallel-to-serial piece 220 pairs IFFT blocks 215 from N size is converted, and (such as multichannel is multiple With), to generate serial time domain signal.Cyclic prefix is inserted into time-domain signal by " addition cyclic prefix " block 225.Up converter The output of " addition cyclic prefix " block 225 is modulated (such as up conversion) at RF frequency, for being passed via wireless channel by 230 It is defeated.Signal can also be filtered before being transformed to RF frequency at base band.

The RF signal of transmission reaches UE 116 from gNB 102 after through wireless channel, and executes at UE 116 The reverse operation with the operation at gNB 102.The signal down conversion received is baseband frequency by downconverter 255, and It removes cyclic prefix block 260 and removes cyclic prefix to generate serial time-domain baseband signal.Serial-to-parallel piece 265 by time-domain baseband Signal is transformed to parallel time-domain signal.The fft block 270 of N size executes fft algorithm to generate N number of parallel frequency-domain signals.It arrives parallel Parallel frequency-domain signals are transformed to the sequence of modulated data symbol by serial block 275.Channel decoding and demodulation block 280 are to modulation symbol It is demodulated and decoded, to restore original input data stream.

As described in more detail below, the signaling for CSI report can be performed in transmitting path 200 or RX path 250. Each of gNB 101 to gNB 103 can be achieved to be modeled as 116 hair sent to UE 111 to UE in the downlink Path 200 is sent, and can realize and be modeled as 116 carrying out received RX path 250 from UE 111 to UE in the uplink. Similarly, each of UE 111 to UE 116 can be achieved for 103 being sent to gNB 101 to gNB in the uplink Transmitting path 200, and can realize for 103 carrying out received RX path from gNB 101 to gNB in the downlink 250。

Each of component in Fig. 2A and Fig. 2 B can come real using only hardware or using the combination of hardware and software/firmware It is existing.As a specific example, at least some of the component in Fig. 2A and Fig. 2 B can be implemented in software, and other components can be by can The mixing of hardware or software and configurable hardware is configured to realize.For example, fft block 270 and IFFT block 215 can realize to be configurable Software algorithm, wherein the value of N size can change according to implementation.

Although this is only exemplary mode, and should not be construed as in addition, being described as using FFT and IFFT It limits the scope of the present disclosure.Other types of transformation can be used, such as discrete Fourier transform (DFT) and inverse discrete fourier become Change (IDFT) function.It should be understood that the value of variable N can be any integer (1,2,3,4 etc.) for DFT and IDFT function, and For FFT and IFFT function, the value of variable N can be any integer (1,2,4,8,16 etc.) of the power as 2.

Although Fig. 2A and Fig. 2 B shows the example in wireless transmission path and wireless receiving path, can be to Fig. 2A and figure 2B carries out various changes.For example, can combine, further segment or omit the various parts in Fig. 2A and Fig. 2 B, and can basis Particular demands add additional component.Moreover, Fig. 2A and Fig. 2 B is intended to show that the transmitting path that can be used in the wireless network and connects Receive the example of the type in path.Other suitable frameworks can be used for supporting the wireless communication in wireless network.

Fig. 3 A shows the exemplary UE 116 according to the disclosure.The embodiment of UE 116 shown in Fig. 3 A is only used for Illustrate, and the UE 111 to UE 115 of Fig. 1 there can be the same or similar configuration.However, UE has various configurations, And the scope of the present disclosure is not limited to any specific implementation of UE by Fig. 3 A.

UE 116 includes antenna 305, radio frequency (RF) transceiver 310, sends (TX) processing circuit 315, microphone 320 and connect Receive (RX) processing circuit 325.UE 116 further include loudspeaker 330, processor 340, input/output (I/O) interface (IF) 345, Input 350, display 355 and memory 360.Memory 360 includes operating system (OS) program 361 and one or more application 362。

RF transceiver 310 is received from antenna 305 enters RF signal by what the gNB of network 100 was sent.RF transceiver 310 is right Down conversion is carried out into RF signal to generate intermediate frequency (IF) or baseband signal.IF or baseband signal are sent to RX processing circuit 325, RX processing circuits 325 generate processed base band by the way that base band or IF signal are filtered, decode and/or are digitized Signal.RX processing circuit 325 sends loudspeaker 330 (as voice data) for processed baseband signal or sends everywhere Reason device 340 is to be further processed (as web browsing data).

TX processing circuit 315 receives analog or digital voice data from microphone 320 or receives other biographies from processor 340 Base band data (such as network data, Email or interactive video games data) out.315 pairs of outflow base band of TX processing circuit Data are encoded, are multiplexed and/or digitized, to generate processed base band or IF signal.RF transceiver 310 is electric from TX processing Road 315, which receives, spreads out of processed base band or IF signal, and is the RF sent via antenna 305 by base band or IF signal up conversion Signal.

Processor 340 may include one or more processors or other processing units, and execute storage in memory 360 OS program 361, to control the integrated operation of UE 116.For example, processor 340 can be controlled according to well-known principle RF transceiver 310, RX processing circuit 325 and TX processing circuit 315 are to the reception of forward channel signal and reverse channel signals It sends.In some embodiments, processor 340 includes at least one microprocessor or microcontroller.

As described in disclosure embodiment, processor 340 is also able to carry out resident other places in memory 360 Reason and program, such as the operation of CQI measurement and for the report of system described in disclosure embodiment.Processor 340 can move data into or remove memory 360 according to the needs for executing processing.In some embodiments, processor 340 is matched It is set to based on OS program 361 or the signal in response to being received from gNB or operator and executes using 362.Processor 340 also joins It is connected to I/O interface 345, I/O interface 345 provides for UE 116 and is connected to other devices (such as laptop computer and hand-held Computer) ability.I/O interface 345 is the communication path between these attachmentes and processor 340.

Processor 340 is also connected to input 350 (for example, keyboard, touch screen, button etc.) and display 355.UE's 116 Input 350 can be used to enter data into UE 116 for operator.Display 355 can be liquid crystal display or can present such as Other displays of text and/or at least limited figure from website.

Memory 360 is connected to processor 340.A part of memory 360 may include random access memory (RAM), And another part of memory 360 may include flash memory or other read-only memory (ROM).

As described in more detail below, the signaling and calculating for CSI report can be performed in UE 116.Although Fig. 3 A is shown An example of UE 116, but various changes can be carried out to Fig. 3 A.For example, can combine, further segment or omit in Fig. 3 A Various parts, and can according to particular demands add additional component.As a specific example, processor 340 can be divided into multiple Processor, such as one or more central processing unit (CPU) and one or more graphics processing units (GPU).Although moreover, Fig. 3 A shows the UE 116 for being configured to mobile phone or smart phone, but it is other types of movement that UE, which can be configured to operation, Or fixed equipment.

Fig. 3 B shows the exemplary gNB 102 according to the disclosure.The embodiment of gNB 102 shown in Fig. 3 B is only used There can be the same or similar configuration in other gNB of explanation, and Fig. 1.However, gNB has various configurations, and The scope of the present disclosure is not limited to any specific implementation of gNB by Fig. 3 B.GNB 101 and gNB 103 may include and gNB 102 the same or similar structures.

As shown in Figure 3B, gNB 102 includes mutiple antennas 370a to 370n, multiple RF transceiver 372a to 372n, hair It send (TX) processing circuit 374 and receives (RX) processing circuit 376.In some embodiments, mutiple antennas 370a is into 370n One or more include 2D aerial array.GNB 102 further includes controller/processor 378, memory 380 and backhaul or net Network interface 382.

RF transceiver 372a to 372n is received from antenna 370a to 370n enters RF signal, is such as sent by UE or other gNB Signal.RF transceiver 372a to 372n carries out down conversion to incoming RF signal to generate IF or baseband signal.IF or base band letter Number it is sent to RX processing circuit 376, RX processing circuit 376 is by being filtered base band or IF signal, decoding and/or number Change to generate processed baseband signal.Processed baseband signal is sent controller/processor by RX processing circuit 376 378 with for further processing.

TX processing circuit 374 receives analog or digital data (such as voice data, network number from controller/processor 378 According to, Email or interactive video games data).374 pairs of outflow base band datas of TX processing circuit are encoded, be multiplexed and/ Or digitlization, to generate processed base band or IF signal.RF transceiver 372a to 372n is received from TX processing circuit 374 and is spread out of Processed base band or IF signal, and be the RF signal sent via antenna 370a to 370n by base band or IF signal up conversion.

Controller/processor 378 may include control gNB 102 integrated operation one or more processors or other places Manage device.For example, controller/processor 378 can be controlled according to well-known principle at RF transceiver 372a to 372n, RX Circuit 376 and TX processing circuit 374 are managed to the reception of forward channel signal and the transmission of reverse channel signals.Controller/processing Device 378 can also support additional function, such as more advanced wireless communication function.In some embodiments, controller/processor 378 include at least one microprocessor or microcontroller.

Controller/processor 378 is also able to carry out the program resided in memory 380 and other processing, such as OS.Such as this Described in disclosed embodiment, controller/processor 378 can also support the channel quality with the system of 2D aerial array Measurement and report.In some embodiments, the communication between 378 support entity of controller/processor, such as web RTC.Control Device/processor 378 can move data into or remove memory 380 according to the needs for executing processing.

Controller/processor 378 is also connected to backhaul or network interface 382.Backhaul or network interface 382 allow gNB 102 are connected by backhaul or by network and other equipment or system communication.Interface 382 can be supported by any suitable wired Or the communication being wirelessly connected.For example, when gNB 102 is implemented as a part (such as support 5G or the new nothing of cellular communication system Line is electrically accessed technology or one kind of NR, LTE or LTE-A) when, interface 382 allows gNB 102 to connect by wired or wireless backhaul It connects and is communicated with other gNB.When gNB 102 is implemented as access point, it is wired or wireless that interface 382 allows gNB 102 to pass through Local area network is communicated by wired or wireless connection with relatively large network (such as internet).Interface 382 includes supporting by wired Or it is wirelessly connected any suitable structure of the communication of (such as Ethernet or RF transceiver).

Memory 380 is connected to controller/processor 378.A part of memory 380 may include RAM, and memory 380 another part may include flash memory or other ROM.In some embodiments, multiple instruction is stored in memory, such as BIS algorithm.Multiple instruction is arranged so that controller/processor 378 executes BIS processing, and is determined subtracting by BIS algorithm The signal received is decoded after at least one interference signal.

As described in more detail below, (electricity is handled using RF transceiver 372a to 372n, TX processing circuit 374 and/or RX What road 376 was realized) transmitting path of gNB 102 and RX path execute the configuration and signaling for being used for CSI report.

Although Fig. 3 B shows an example of gNB 102, various changes can be carried out to Fig. 3 B.For example, gNB 102 It may include any number of each component shown in Fig. 3 A.As a specific example, access point may include multiple interfaces 382, and And controller/processor 378 can support routing function to route data between different network address.Specific show as another Example, although being shown as includes the single example of TX processing circuit 374 and the single example of RX processing circuit 376, gNB 102 It may include multiple examples of each (such as each RF transceiver one).

Rel.13LTE supports up to 16 CSI-RS antenna ports, CSI-RS antenna port that gNB is enable to be equipped with a large amount of days Thread elements (such as 64 or 128).In this case, mutiple antennas element is mapped on the port CSI-RS.This Outside, up to 32 ports CSI-RS will be supported in Rel.14LTE.For the Next generation cellular system of such as 5G, it is contemplated that maximum quantity The port CSI-RS more or less keep identical.

For millimeter wave frequency band, although the quantity of antenna element can be bigger for given desktop, laptop, such as Shown in the embodiment 400 of Fig. 4, can corresponding with the quantity of digital precode port, the port CSI-RS quantity due to hard Part is limited (such as being installed the feasibility of a large amount of ADC/DAC with millimeter-wave frequency) and tends to be restricted.In this case, one The port CSI-RS is mapped to can be by a large amount of antenna elements that one group of analog phase shifter 401 controls.Then, an end CSI-RS Mouth can be corresponding with a subarray of narrow analog beams is generated by analog beam forming 405.The analog beam can be configured to lead to It crosses and changes the angle (420) that phase shifter group carrys out inswept wider range on symbol or subframe.The quantity of subarray is (equal to RF chain Quantity) with the quantity N of the port CSI-RS_CSI-PORT(N_{The port CSI-}) identical.Digital beamforming unit 410 is across N_CSI-PORTA analog wave Shu Zhihang linear combination is to further increase pre-coding gain.Although analog beam is that broadband (therefore is not frequency selectivity ), but digital precode can change on frequency subband or resource block.

In order to realize that digital precode, the design effectively of CSI-RS are key factors.For this purpose, being supported in Rel.13LTE The CSI report mechanism of three types corresponding with the CSI-RS of three types measurement behavior: 1) correspond to non-precoded CSI- " A grades (CLASS A) " CSI report of RS, 2) the K=1 CSI-RS with the CSI-RS corresponding to the specific beam forming of UE " B grades (CLASS B) " report of resource, 3) K > 1 CSI-RS with the CSI-RS corresponding to the specific beam forming of cell " B grades (CLASS B) " report of resource.For non-precoded (NP) CSI-RS, using small between the port CSI-RS and TXRU The specific one-to-one mapping in area.Herein, the different port CSI-RS wide beamwidths having the same and direction, and therefore usually It is cell-wide coverage area.For the CSI-RS of beam forming, (cell is specific or UE is specific) beam forming operation quilt It is applied to non-zero power (NZP) CSI-RS resource (it includes multiple ports).Herein, (at least at given time/frequency) The port CSI-RS has narrow beam width and does not therefore have cell-wide coverage area, and (at least from the point of view of gNB angle) At least some CSI-RS port resource combinations have different beam directions.

It, can be easily special using UE in the scene that can pass through the UL signal measurement DL long-term channel statistics at service gNB Fixed BF CSI-RS.When UL-DL duplex distance is sufficiently small, this is usually feasible.However, when the condition is invalid, one A little UE feedbacks are used for gNB to obtain the estimation of DL long-term channel statistics any one of (or its indicate).For the ease of this Processing sends the first BF CSI-RS with cycle T 1 (ms) and sends the 2nd NP CSI-RS with cycle T 2 (ms), wherein T1≤T2. The program, which is referred to as, mixes CSI-RS.The implementation of mixing CSI-RS depends greatly on CSI processing and NZP The definition of CSI-RS resource.

In Rel.10LTE, UL SU-MIMO is supported to transmit using codebook-based transmission plan.That is, UL License (including DCI format 4) includes single PMI field (together with RI), and single PMI field instruction should be used by UE (from predetermined Adopted code book) single precoding vector or matrix be for scheduled UL transmission.Therefore, when multiple PRB are assigned to UE, Meaned to utilize broadband UL precoding by the single pre-coding matrix that PMI is indicated.Although it is simple, this is clearly suboptimum, Because typical UL channel be frequency selectivity and UE by frequency scheduling to use multiple PRB to be transmitted.

The another disadvantage of Rel.10LTE UL SU-MIMO is a lack of to the field that cannot obtain accurate UL-CSI at gNB The support of scape (this is needed for the codebook-based transmission of correct operation).Such case is likely to occur in high mobility UE's In the scene of burst inter-cell interference in scene or in the cell of the isolation with difference.

Therefore, for following reasons, need to design new component to realize the more effective support to UL MIMO.Firstly, to the greatest extent may be used It can frequency selectivity (or subband) precoding of expectation support for UL MIMO.Secondly, even if accurately UL-CSI is at gNB When unavailable, UL MIMO should also provide competitive performance.Furthermore the UL MIMO solution proposed should be able to utilize UL-DL reciprocity, wherein UE is estimated using CSI-RS to provide UL-CSI for TDD scene.

In the disclosure, unless otherwise stated, term PM I (precoding matrix indicators) and TPMI (transmission PMI) It is interchangeably used to indicate the relevant DCI field of UL, the relevant DCI field instruction UE of UL is passed using to carry out scheduled UL Defeated, the allocated precoder or precoder group.Similarly, unless otherwise stated, term RI (order designator) and TRI (transmission RI) is interchangeably used to indicate the relevant DCI field of UL, and the relevant DCI field instruction UE of UL is used to carry out Scheduled UL transmission, the allocated number of plies.

The disclosure includes at least four components for realizing UL MIMO.The first component includes being used for allocating pre-coding UL The method of transmission.Second component includes the embodiment for supporting UL frequency selectivity precoding.Third member includes being used for The method for realizing the UL MIMO transmission based on reciprocity.4th component includes that there are two the methods that the UL of waveform is transmitted for having. For indicating that functional title or term are exemplary, and can be used in the case where not changing the essence of the embodiment Other titles or label replace.

For the first component (that is, allocating pre-coding UL is transmitted), for facilitating an example of the operation in various scenes Property embodiment, dynamically with half dynamic beam forming can be described as follows.In one embodiment, when accurate UL-CSI exists When can be used at gNB or UE (for example, low UE speed and the isolation of good cell or Inter-Cell Interference Coordination), dynamic beam forming is outstanding It is applicable in.In this case, because accurately directional information be it is addressable, UE can pass through narrow directional beam transmit number According to.For FDD, gNB can via DL control channel (such as UL license) to UE signaling beam forming or precoding vector/matrix (or Multiple vectors/multiple matrixes) selection.After receiving this precoding information, UE should use associated precoder or Beam-shaper sends requested UL data to gNB.The precoding information is dynamically updated by gNB.

In order to support dynamic beam to shape, codebook-based MIMO transmission can be used, wherein UL license (including associated DC I) Including single precoding information (PMI) field (together with RI).PMI instruction is made the list for being configured for scheduled UL transmission by UE A pre-coding matrix.Therefore, a precoder or beam forming are applied to all scheduled PRB of the UE.

When UL-CSI mass is damaged at gNB or UE (for example, leading to the minizone for the burst for being known as flash light effect The cell isolation of the high UE speed and difference of interference), the forming of half dynamic beam is especially suitable.In this case, since UE is only capable of It indicates approximate direction information (or range), therefore it is more favorable that gNB, which transmits data by one group of directional beam,.For this mesh , it can be used and recycle (on the ofdm symbols) or in one group of wave beam in the domain frequency (on RE, RB or one group of RB) in time Precoder (wave beam).This approximate direction information can be via DL control channel (such as UL license) signaling to UE.This information It can be a kind of long-term precoding information or the indicator of precoder subset.

Half dynamic beam is shaped, the set of multiple precoders and scheduled circulation pattern (or circulation pattern collection) are tied It closes and uses.The set of circulation pattern or precoder can be designated, and permit signaling to UE via UL.It is shaped for dynamic beam PMI field can be extended to support the half dynamic beam forming recycled via precoder.Order -1 (layer) is transmitted, This half dynamic beam forming can be with the transmission diversity grade such as applied to the SFBC or SFBC-FSTD of two or four wave beam Connection, wherein the quantity of wave beam may be configured as the quantity of UL antenna port.

Fig. 5 depicts exemplary operation 500, and wherein UE1 502 and UE2 503 are connect with gNB 501.GNB is permitted via UL Can 1 be 1 schedule UL transmissions of UE, and via UL license 2 be 2 schedule UL transmissions of UE.It is receiving and is being successfully decoded comprising using After the UL license 1 for the license for making UE 1 using dynamic beam forming and transmitting data, UE 1 is formed in UL using dynamic beam Upper transmission.That is, UE 1 carries out precoding to its data, so that data are transmitted via a narrow directional beam. The precoder used by UE 1 is via the PMI field in UL license 1 come signaling.It is receiving and is being successfully decoded comprising for making After UE 2 transmits the UL license 2 of the license of data using the forming of half dynamic beam, UE 1 is formed in UL using half dynamic beam Upper transmission.That is, UE 2 to its data carry out precoding so that data via make this four wave beams in time ( In OFDM symbol), frequency (on RE or RB) or multiple directional beams for recycling in both time and frequency transmit.Scheming In 5, for illustrative purpose, the wave beam of four space overlaps is shown.By the set of the precoder used of UE 1 or to follow Ring mode is via the PMI field signaling in UL license 2 using four wave beams.

In the disclosure, term " dynamic beam forming " and " forming of half dynamic beam " is used for illustrative purpose.Its Its term can also be used for indicating identical method and/or function.For example, term such as " transmission plan 1 or A " and " transmission plan 2 Or B "-or " transmission mode 1 " and " transmission mode 2 " can be respectively used to indicate two kinds of transmission methods.Both transmission plans It can be used together with other transmission plans.

In order to interchangeably configure UE, several selectivity embodiment party with dynamic shown in Fig. 5 or the forming of half dynamic beam Formula is possible.

In the first embodiment, UE via higher (such as RRC) signaling semi-statically use dynamic or half dynamic beam at Shape configures.The example of the embodiment is that transmission plan or transmission mode configuration are executed via at least one RRC parameter.At this In the case of kind, the value instruction UE of RRC parameter is configured with dynamic beam forming or the forming of half dynamic beam.

In the first embodiment, the PMI field of a part as the DCI in (above-mentioned) UL license is available In both dynamic and the forming of half dynamic beam.PMI field can be with dynamic beam forming or the forming of half dynamic beam according to UE It configures, carrys out the different hypothesis of signaling.When UE with dynamic beam forming to configure when, PMI field instruction should be used by UE with In the pre-coding matrix or vector of the UL data transmission being licensed.When UE is shaped with half dynamic beam to configure, PMI field can Indicate the selection of the pre-coding matrix that the UL data for being configured for being licensed should be made to transmit by UE or Vector Groups.

It is given in Table 1 following example, the time over-sampling DFT Vector Groups of MO length are used as M in this example The set of -1 precoder of possible order of antenna port.Therefore, (OM-1) a precoding vector collection is available.As showing Example, instruction UE are to be come the RRC or higher parameter configured with dynamic beam forming or the forming of half dynamic beam BeamformingScheme.When parameter BeamformingScheme indicates " dynamic " (that is, dynamic beam forming), PMI=i Indicate that UE is requested (answering) and uses precoder v_iTo carry out UL data transmission.When parameter BeamformingScheme instruction " half Dynamically " when (that is, half dynamic beam shapes), PMI=i instruction request UE (answering) uses precoder group G_i(it includes B continuous Precoder group) to carry out UL data transmission.Selectively, if the extension of UL channel angle is very big, it is possible to use B discontinuous The set of precoder.

The exemplary PMI table of embodiment 1

[table 1]

G_i=[v_i v_{Mod (i+1, OM)} … v_{Mod (i+B-2, OM)} v_{Mod (i+B-1, OM)}] (equation 1)

In this second embodiment, UE is via the UL license transmitted in DL control channel dynamically with dynamic or half dynamic Beam forming configures.

The second embodiment another example is indicate UE using a DCI parameter indicate to be used by UE with In the selection of the transmission plan or mode (dynamic or half dynamic) of the UL data transmission being licensed.In this example, permitted as UL Can in DCI a part PMI field can be used for dynamic and half dynamic beam forming both.Value depending on the DCI parameter (that is, UE is configured with dynamic beam forming or the forming of half dynamic beam), it is also necessary to PMI field.When UE dynamic beam When forming configuration, pre-coding matrix or vector that PMI field instruction should be such that the UL data for being configured for being licensed transmit by UE. When UE is shaped with half dynamic beam to configure, PMI field can indicate that the UL data for being configured for being licensed should be made to transmit by UE Pre-coding matrix or Vector Groups selection.The example can similarly be described with table 1.But in this case, higher Layer parameter BeamformingScheme can be 0 with value (indicating the forming of such as half dynamic beam) or value is that 1 (expression is for example Dynamic beam forming) DCI field BeamformingScheme replace.

Another example of the second embodiment is a PMI word merely with a part of the DCI in permitting as UL Section.In such case, it is contemplated that in total N associated with the PMI field of B bit_HA possible hypothesis (wherein N_H≤2^B), N_HSome N in a hypothesis_{H, d}It can be utilized to indicate that the precoder for dynamic beam forming selects, and remaining (N_{H, sd}= N_H-N_{H, d}A hypothesis) it can be utilized to indicate the selected precoder group for the forming of half dynamic beam.The example can be It is described in table 2.Compared with table 1, the hypothesis shaped from dynamic and half dynamic beam is combined by table 2 to be referred to by PMI field The set shown.For the example, the quantity of hypothesis associated with PMI field is the first example with second embodiment And twice of the associated quantity of PMI field in first embodiment.

The exemplary PMI table (the second example) of embodiment 2

[table 2]

G_i=[v_i _{Vmod (i+1, OM)} … v_{Mod (i+B-2, OM)} v_{Mod (i+B-1, OM)}] (equation 2)

Selectively, using two-dimentional precoder or code book (especially with two dimension or rectangular array geometric correlation).? In this case, precoder can correspond to a pair of of index (m₁, m₂), and each index represents one in two dimensions.Simulation It can be in 3 (wherein v of equation for above-mentioned -1 precoder of exemplary order_iAnd G_iDefined in equation 2) in be described.Herein, M₁ And M₂Respectively indicate the port number in the first peacekeeping second dimension.Equally, O₁And O₂Respectively indicate the mistake in the first peacekeeping second dimension Sampling factors.

Selectively, the one-dimensional precoder or code book for dual-polarized array configuration design can also be used.In such case Under, it can be used tool total there are two same section (each part associated with a polarization group) and between two polarization groups The precoder of phase.It is modeled as the above-mentioned exemplary one-dimensional port 2M (each of two polarization groups including M port) order- 1 precoder can be described in equation 4.Herein, using K possible common phase values.

G_m=[v_m v_{Mod (m+1, OM)} … v_{Mod (m+B-2, OM)} v_{Mod (m+B-1, OM)}], (equation 4)

M=(K-1) i+k

Selectively, the two-dimentional precoder or code book for dual-polarized array configuration design can also be used.It is modeled as above-mentioned Example two dimensional 2M₁M₂Port (including M₁M₂Each of two polarization groups of port) order -1 precoder can be in equation 5 It is described.It can be with three index m of the single PMI of composition₁, m₂, k similarly defines wave beam group.

By any of above-mentioned code book option, the switching between dynamic beam forming and the forming of half dynamic beam is supported DL signaling embodiment be applicable, and can be extended by way of direct forward direction (because of each precoder or code book Corresponding to single PMI).

For second component (that is, supporting the precoding of UL frequency selectivity), in above-mentioned embodiment party related with the first component In formula, single precoder is indicated to transmit for UL to UE.Therefore, for individually distributing, identical precoder is applied to The RB of all distribution.Selectively, subband precoding can also be by carrying out via UL license in each subband signaling one PMI It supports, one of subband may include multiple continuous RB.In this case, the DCI field comprising precoding information includes Multiple PMI, each of multiple PMI are associated with a subband and indicate the selection of the precoder from predetermined code book.

Fig. 6 shows the exemplary DL signaling for subband precoding and UE processing, to explain including N_PMIA PMI is (each It is associated with a subband) precoding information DCI field.The quantity N of PMI_PMIWith the subband size P of RB_SUBBAND(P_Subband) phase It is mutually interdependent.For given UL resource allocation span (with the amount R A of RB_RBIndicate), the quantity of PMI can obtain being as follows:Therefore, for given UE resource allocation, the quantity of PMI is not directly dependent on the RB's for distributing to UE Quantity, because UL resource allocation may include the RB (as shown in 602) of multiple continuous RB (as shown in 601) or cluster.Phase Instead, depend in associated UE resource allocation since the RB of minimum index to the RB of highest index, RB quantity. The RB of the RB of minimum index and highest index are expressed as RB_low(RB_{It is low}) and RB_high(RB_{It is high}),Selectively, in RA_{RB, i}In the case where quantity for the RB in the i-th cluster, It can also be usedTwo examples provided in Fig. 6 indicate continuous resource allocation (601) and the resource allocation of cluster (602).Herein, illustratively, using P_SUBBAND=4.Although being distributed in 602 RB sum less than 601 in sum, but the sum of subband, and therefore PMI quantity () it is identical , because DL allocation span is identical for 601 and 602.

As shown in Figure 7, there is for supporting several DL signaling embodiments of subband precoding.Following example exists Several aspects are different, such as associated DCI payload size of several aspects be it is fixed or with distributed The corresponding subband of RB quantity (therefore, the quantity of subband PMI) and change, all PMI components be to be included in DCI also It is that at least some PMI components are external by signaling, and/or the quantity of subband corresponding with the RB distributed in DCI (or main DCI) (therefore, the quantity of subband PMI) is changing according further to UL resource allocation for fixation.When the quantity of subband PMI is fixed, PMI granularity (subband size) changes according to UL resource allocation.On the contrary, when PMI granularity (subband size) is fixed, subband PMI Quantity changed according to UL resource allocation.

In first embodiment 1, as shown in DCI 710, using including N_PMIA PMI is (each related to a subband Connection) the variable precoding information DCI field 711 and 712 of length.In this case, subband size (the RB number of each subband Amount) it is fixed.The quantity N of PMI_PMIDepending on the position of allocated size and assigned RB (for example, the PRB of distribution is to connect It is continuous or cluster).Therefore, the size for permitting associated DCI with UL is also variable (quantity depending on subband).This Increase the number that the blind decoding at UE is attempted.As shown in the DCI 710 as Fig. 7, precoding information DCI field 711 and 712 Length is scaled according to the quantity of the PMI inferred from resource allocation information, and the wherein expression of DCI field 712 is needed than DCI field The resource allocation (the case where for example 712 distribution ratio DCI 711 more RB of field of DCI field) of 711 more PMI.

It is pre- needed for supporting subband precoding using including at least as shown in DCI 720 in second embodiment 2 Encoded information (N_PMIA PMI) the second (or second level) DL control information.In this case, subband size (each subband RB quantity) it is fixed.The position of the precoding information and size can be according to the resource allocations indicated in associated UL license Come carry out.In this case, UE receives UL license first and is decoded to the DCI field of instruction resource allocation.It is decoding After resource allocation information, UE is decoded the 2nd DL control information for only including precoding information.Precoding information instruction The precoder for collecting for each RB (subband), and therefore being used for each RB for UE distribution by UE.Including N_PMIIt is a The length precoding information DCI field of PMI is variable, and can be pushed away from the resource allocation information from the first DL control information Break and.Therefore, the number that blind decoding associated with the first DL control information is attempted is not increased.

In this embodiment, the first DL, which controls information, can be used C-RNTI or UE ID via the (simulation of L1DL control channel It is sent for LTE PDCCH or ePDCCH).2nd DL controls information can control unpack transmission with the first DL, wherein such as (in the time and/or frequency domain) of its position and/or payload size and/or the configured transmission of MCS can be controlled from the first DL Information implicitly (for example, from C-RNTI and/or some specific parameters of other UE) or clearly (controls information in the first DL In be designated as DCI field) be inferred to.Information is controlled for the 2nd DL, can be used or do not use C-RNTI or UE ID.Such as by Fig. 7 DCI 720 shown in, the length of precoding information DCI field according to the quantity of the subband PMI inferred from resource allocation information and Scaling, wherein DCI field 722 indicates to need resource allocation (for example distribution of DCI field 722 than the more PMI of DCI field 721 The case where than 721 more RB of DCI field).However, being different from the first embodiment, as shown in DCI 710, included resource The length for distributing the first DL control information of information keeps identical, and the length of the 2nd DL control information is according to required subband The quantity of PMI and change.

2nd DL control information can be via L1DL control channel (for example, being modeled as LTE PDCCH or ePDCCH- therefore can It is perceived as second level DCI) or as one of resource/channel for DL data transmission (being such as modeled as LTE PDSCH) Divide to send.It can be located at the identical time slot/subframe of time slot/subframe with transmission DCI (or first order DCI, therefore UL permits) In, or in the time slot/subframe being different from.No matter the 2nd DL control information is with second level DCI or DL data letter Road transmits the form transmission of (being modeled as LTE PDSCH), and CRC can be attached to its information bit in order to the error-detecting at UE.

In third embodiment 3, as shown in DCI 730, the fixed quantity N including PMI is used_PMI> 1 (each with one A subband is associated) regular length precoding information DCI field 731.Therefore, only allow single N_PMIValue.In such case Under, subband size (the RB quantity of each subband) can be for what be can be changed, this depends on resource allocation (allocated size and the RB of distribution Position).

For example, in N_PMIIn the case where=2, two PMI (therefore, two individual precoders) only can be distributed to UE.The One PMI instruction precoder associated with the first subset of RB of distribution and the 2nd PMI have the second son of the RB of distribution Collection, wherein second subset it is different from the first subset-wherein, the first subset and second subset, which are combined to constitute, distributes to UE's All RB.Therefore, the quantity of the RB of distribution in each of two son collection is variable (depending on resource allocation).Therefore, with UL permits that the size of associated DCI is fixed, and the quantity of RB associated with each of two PMI is variable 's.In this case, the number that blind decoding associated with the first DL control information is attempted is not increased.Such as by the DCI of Fig. 7 Shown in 730, the length of precoding information DCI field keeps identical because the PMI of fixed quantity for any resource allocation (that is, The position of the RB of the quantity and/or distribution of the RB of distribution).

For third embodiment, with the explanation of each PMI and the related several sub- implementations of associated subband size Mode can be described as follows.

In the first sub- embodiment, with N_PMICollection/subset of the associated RB of each of a subband is with resource allocation (that is, position of the RB of the quantity and/or distribution of the RB of distribution) and changes.However, for given/fixed resource allocation, With N_PMICollection/subset of the associated RB of each of a subband is fixation, scheduled or configuration via higher level signaling 's.This can for example be shown in FIG. 6.That is, the given quantity of RB for being indicated in UL resource allocation (RA) field and/ Or position, each subband constitute the subset of the PRB and/or PRB of identical quantity.Therefore, in the relevant DCI of associated UL or Via not needing any additional instruction in any other DL signaling mechanism.

In the second sub- embodiment, it can be changed and i-th of PMI (PMI_i, wherein i=0,1 ..., N_PMI- 1) it is associated Subband, and therefore via the relevant DCI of UL dynamically signaling.In this case, it is only necessary to signaling (N_PMI- 1) a PMI Subband, because the subband for a residue PMI can be from RA field and (N_PMI- 1) remaining subband export in a subband.Therefore, In addition to N_PMIExcept a PMI/TPMI, (N_PMI- 1) a added field (each instruction and (N in added field_PMI- 1) a PMI phase Associated subband) via the relevant DCI signaling of UL.For example, in N_PMIIn the case where=2, an additional subband indicator field (for the first PMI or the 2nd PMI) is via the relevant DCI signaling of UL.In a kind of modification of the sub- embodiment, two PMI In one (be expressed as PMI_SB,1) it can indicate the precoder (example for being only used for the RB indicated in additional subband indicator field Such as, be interpreted to be modeled as " best-M " subband, wherein the value of M can be used as additional subband indicator field a part or It is semi-statically configured via MAC CE dynamically signaling, or via higher level signaling), and another PMI (is expressed as PMI_SB,2) it can indicate the broadband precoding device of the RB (indicating in resource allocation DCI field) that can be used for all distribution.In the son In another modification of embodiment, one in two PMI (is expressed as PMI_SB,1) can indicate to be only used for indicating in additional subband The precoder of the RB indicated in symbol field is (for example, be interpreted to be modeled as " best-M " subband, wherein the value of M can be used as attached A part of subband indicator field is added perhaps dynamically signaling or semi-statically to match via higher level signaling via MAC CE Set), and another PMI (is expressed as PMI_SB,2) precoder of RB for supremum distribution can be indicated (in resource allocation DCI word It is indicated in section).

In order to avoid can increase DL control signaling UE blind decoding quantity and any variation in DCI size, can Size fixed or that additional subband indicator field is configured via higher level signaling.Therefore, related to subband indicator field The quantity of the hypothesis (either moreover, it is assumed that collection) of connection can be fixed or be configured via higher level signaling.For example, in order to be used for PMI_SB,2Subband assume quantity remain maximum N_HYP, work as N_RB(such as resource allocation DCI field when a RB is assigned to UE Middle instruction), possible number of sub-bands (N_RBThe subset of a RB) it can be configured to be no more than N for fixed or higher_HYP.If RB of each of these the possible subbands in the quantitative aspects size having the same and each subset of RB be as far as possible Continuously, then each of possible subband can generally compriseA RB.

In the 4th embodiment 4, precoding information DCI field may include PMI quantity N_PMIThe probable value for being up to K. The embodiment can be considered as the intermediate zone between embodiment 1 and embodiment 3.In this case, subband size is (every The RB quantity of a subband) it can be for what be can be changed, this depends on resource allocation (allocated size of the RB of distribution and position).For example, In K=2 and N_PMIIn the case where ∈ { 1,2 }, precoding information DCI field may include 1 PMI or 2 PMI.When precoding is believed When ceasing DCI field comprising 1 PMI, UE should be used by the precoder of PMI instruction with the RB for its all distribution.When prelisting When code information DCI field includes 2 PMI, the first PMI instruction and the associated precoder of the first subset of RB distributed and 2nd PMI have distribution RB second subset, wherein second subset it is different from the first subset-wherein, the first subset and second Sub-combinations constitute all RB for distributing to UE together.Therefore, for two son collection in each of, distribution RB quantity For variable (depending on resource allocation).

Therefore, the size for permitting associated DCI with UL is variable (can be one of two possible sizes), and The quantity of RB associated with PMI is variable.Which increase the numbers that the blind decoding at UE is attempted, but increase only 2 times.It removes There is only the precoding informations of two possible length (with N_PMITwo values it is associated), embodiment 4 can be by with Fig. 7's The similar mode of DCI 710 is shown.

For any one of the above-mentioned example embodiment for supporting subband precoding, especially for wherein making The embodiment 2 (DCI 720 of Fig. 7) of information is controlled with the 2nd DL comprising subband PMI, can be deposited in DCI (or first order DCI) Have one it is additional it is assumed that additional hypothesis instruction UE may be assumed that previously (or recently) signaling precoding information (including PMI, Wide band component or subband component) with the UL transmission for being licensed.The hypothesis, which can also indicate that may be used at, previously (or recently) to be permitted Can UL transmission in signaling identical precoder (broadband and/or subband).

If being possible for this dry separation additionally assumed of signaling.Firstly, the hypothesis can with it is any other existing One code point of the relevant DCI field of UL is associated.For example, when not including precoding information in DCI (or first order DCI) When, this is relevant.Some exemplary DCI fields include resource allocation, the DCI field for indicating transmission plan or UL DMRS letter Breath.Secondly, indicating whether the dedicated 1 bit DCI word of the 2nd DL control information comprising precoding information (such as subband PMI) Section.Furthermore when using twin-stage code book (describing in the disclosure later), broadband (first order) PMI component may include in DCI In (or first order DCI) and signaling is the first PMI DCI field.In this case, the additional hypothesis may include be first One code point of PMI DCI field.

Therefore, when detecting the additional hypothesis at UE, UE does not attempt twoth DL control letter of the decoding including subband PMI Breath, and assume previously (nearest) signaling and the precoding information received.The program facilitates DL control consumption and saves, because Such as when gNB/ network seems and haves no need to change UL precoder, (it not may include subband to the 2nd DL of signaling control information PMI)。

It can be shown in the 800 of Fig. 8 using the modification (DCI 720 of Fig. 7) of the above-mentioned embodiment 2 additionally assumed.? In the illustrated examples, (DL controls information to one in two value informations that additional hypothesis 805 includes in DCI 801 by signaling 1).As disclosed previously, other options can be used.When (in DCI field 803) signaling additional hypothesis, signaling is not had to The 2nd DL control information precoding information of subband PMI (be expressed as include).Therefore, after detecting hypothesis 805, UE be may be assumed that / receive precoding information (for example, from decoding recently/receives in nearest early decoding UL license) in signaling Precoder (PMI).Otherwise, signaling it is new/precoding information that updates.In this case, UE should based on DCI 802 or Decoded UL resource allocation in 803 controls information to receive/decode the 2nd DL including precoding information.

Any one of above embodiment for supporting subband precoding is shaped suitable for dynamic beam, therefore can be with Mechanism (mechanism as illustrated in table 1 and 2) combination for the forming of half dynamic beam.That is, for precoder/wave beam The purpose of former circulation, dynamic beam forming can be associated with the DL control signaling mechanism for subband precoding, and half is dynamic State beam forming is associated with the DL controlling mechanism of precoder group is used to indicate.

In addition, when dynamically configuring dynamic and the forming of half dynamic beam for UE, it also can be via higher (RRC) Signaling configures UE by RB (" broadband " precoding) for all distribution or the single precoder of subband precoding.At this In the case of kind, RRC parameter is used for pre- by " broadband " precoding (the single precoder of the RB for all distribution) or subband (may be multiple precoders, subset of each precoder for the RB of distribution) is encoded to configure UE.For example, can be used two Value RRC parameter SubbandPrecodingEnabled.When its value is " true (TRUE) " or " conducting (ON) ", UE subband is pre- Coding is to configure.In this case, it according to one in aforementioned four embodiments for subband precoding, can be used more A PMI (including PMI, this depends on embodiment).When its value is " false (FALSE) " or " shutdown (OFF) ", UE is used " broadband " precoding configures.In this case, unrelated with UE resource allocation, use a PMI.

The above-mentioned example embodiment supported about the signaling convenient for the switching between dynamic and the forming of half dynamic beam And for supporting the embodiment of subband precoding is applicable not only to single-stage precoder structure (and therefore, to be suitable for single-stage Code book), but also it is suitable for twin-stage precoder structure (and therefore, being suitable for twin-stage code book).

For third member (that is, embodiment with the twin-stage code book based on twin-stage precoder), precoding vector Or matrix and two indexes are (for example, i₁And i₂) associated, wherein the first index instruction wide band component and the second index instruction Possible subband component.The example of this precoder structure is(with Rel.12LTE DL MIMO code book phase Like), whereinIt is broadband (that is, one precoder of single-stageIt therefore is also i₁, RB for all distribution), and It can be broadband or subband (that is,-two precoders of single-stageIt therefore is also i₂, can be used for the RB of different distribution), this depends on Then " broadband " precoding or subband precoding of UE are configured to.This is to index (i₁, i₂) correspond to prelist what is be configured Precoder (vector or matrix) in code code book.First precoder(together with its associated PMI value i₁) can correspond to Precoder group, wherein the second precoder(together with its associated PMI value i₂) can correspond toIn precoder The selection and linear combination of group.In the case where dual polarized antenna, the second precoder(together with its associated PMI value i₂) It also may include the common phase operation between two polarization groups.

In addition, using two-dimentional twin-stage precoder or code book (especially with two dimension or rectangular array geometric correlation).? In this case, the first PMI value i₁It can be by two index (i_1,1, i_1,2) constitute, wherein each corresponding to one in two dimensions It is a.Therefore, corresponding precoder structure can be written as(with Rel.13LTE DL MIMO code This is similar).Herein,It is broadband (that is, one precoder of single-stageIt therefore is also (i_1,1, i_1,2), for institute Have the RB of distribution) andIt can be broadband or subband (that is,-two precoders of single-stageIt therefore is also i₂, can be used for difference Distribution RB), this depend on be configured to UE " broadband " precoding or subband precoding.The index group (i_1,1, i_1,2, i₂) correspond to the precoder (vector or matrix) in the precoding codebook being configured.First precoder (together with its associated PMI value (i_1,1, i_1,2)) it can correspond to precoder group, wherein the second precoder(together with it Associated PMI value i₂) can correspond toIn precoder group selection and linear combination.In the feelings of dual polarized antenna Under condition, the second precoder(together with its associated PMI value i₂) also may include between two polarization groups common phase operation.

It is suitable for one-dimensional or two-dimentional precoder for the embodiment of twin-stage precoder or code book below.For two dimension Precoder or codebook structure, the first PMI value i₁It can be by two index (i_1,1, i_1,2) constitute.Therefore, first order precoder can It is associated with the two indexes:

For example, in order to for twin-stage precoder dynamic or half dynamic beam forming interchangeably configure UE, simulate Exemplary several selective embodiments for above embodiment and for single-stage precoder are possible.It is pre- for twin-stage Encoder or code book, this is to PMI value (i₁, i₂) (or (i for two-dimentional precoder_1,1, i_1,2, i₂)) can be moved for dynamic and half State beam forming provides natural support.When configuring dynamic beam forming, signaling includes i to the PMI of UE₁(it is by for two dimension (the i of code book_1,1, i_1,2) constitute) and i₂The two.When configuring the forming of half dynamic beam, signaling only includes i to the PMI of UE₁(its by (i for two-dimentional precoder_1,1, i_1,2, i₂) constitute).The value of second precoder(together with its associated PMI value i₂) It indicates that the precoder group recycled to transmit for its UL data should be executed on it by UE.

In the first embodiment, the PMI field of a part as the DCI in UL license is (above-mentioned) available In dynamic and the forming of half dynamic beam.It is with dynamic beam forming or the forming configuration of half dynamic beam (that is, according to finger according to UE Show that UE is with dynamic beam forming or the forming of half dynamic beam come the setting of the higher parameter configured, or more generally, First or second transmission plan), PMI field can the different hypothesis of signaling.When UE with dynamic beam forming to configure when, PMI word The pre-coding matrix or vector that section instruction should be such that the UL data for being configured for being licensed transmit by UE.In this case, PMI word Section i includes that (it is by (the i for two-dimentional code book for two indexes_1,1, i_1,2) constitute) and code book i₂.When UE with half dynamic beam at Shape is come when configuring, PMI field i can indicate pre-coding matrix or vector that the UL data for being configured for being licensed should be made to transmit by UE The selection of group.In this case, PMI field i only includes the i of same codebook₁。

For example, RRC or more advanced layer parameter BeamformingScheme be used to indicate UE be with dynamic beam forming or Half dynamic beam shapes to configure.When parameter BeamformingScheme indicates " dynamic " (that is, dynamic beam forming), PMI =(i₁, i₂) indicate that UE is requested (answering) and uses precoderTo be transmitted for UL data.PMI to can combined coding be one A PMI parameter i can also individually be designated as two parameters.When parameter BeamformingScheme instruction " half dynamic " is (that is, half is dynamic State beam forming) when, PMI=i₁Instruction request UE (answering) uses and i₁(for example,) associated precoder group to be to be used for The transmission of UL data.For two-dimentional code book, i₁By (i_1,1, i_1,2) constitute.

In addition, also can when dynamic and the forming of half dynamic beam can be semi-statically configured via higher level signaling for UE Enough individually prelisting by RB (" broadband " precoding) for all distribution or subband precoding via higher (RRC) signaling Code device configures UE.In this case, RRC parameter is used for that (RB's for all distribution to be single by " broadband " precoding Precoder) or subband precoding (may be multiple precoders, subset of each precoder for the RB of distribution) match Set UE.For example, two-value RRC parameter SubbandPrecodingEnabled can be used.When its value is " true (TRUE) " or " conducting (ON) " when, UE is configured with subband precoding.In this case, according to four aforementioned embodiment party for subband precoding One in formula, multiple PMI (including PMI, this depends on embodiment) can be used.When its value be " false (FALSE) " or When " shutdown (OFF) ", UE is configured with " broadband " precoding.In this case, unrelated with UE resource allocation, use one PMI。

In this second embodiment, UE is transmitted via MAC control element (MAC CE) or via in DL control channel UL license, configure dynamically by dynamic or the forming of half dynamic beam.

The second embodiment another example is indicate UE using a DCI parameter indicate to be used by UE with In the UL data transmission being licensed transmission plan or mode (dynamic or half dynamic) selection (or more generally, first or Second transmission plan).In this example, the PMI field as a part of the DCI in UL license can be used for dynamic and half dynamic Both beam formings.Value depending on the DCI parameter is (that is, UE is matched with dynamic beam forming or the forming of half dynamic beam Set, or more generally, first or second transmission plan), it is also necessary to PMI field.When UE with dynamic beam forming to configure when, The pre-coding matrix or vector that PMI field instruction should be such that the UL data for being configured for being licensed transmit by UE.When UE is dynamic with half State beam forming is come when configuring, PMI field can indicate the precoding square that the UL data for being configured for being licensed should be made to transmit by UE The selection of battle array or Vector Groups.DCI field BeamformingScheme value is 0 (indicating the forming of such as half dynamic beam) or takes Value is 1 (indicating that for example dynamic beam shapes).

Another example of the second embodiment is a PMI word merely with a part of the DCI in permitting as UL Section.In such case, it is contemplated that with B bit PMI field (wherein N_H≤2^B) associated N in total_HIt is a possible it is assumed that N_H Some N in a hypothesis_{H, d}It can be utilized to indicate that the precoder for dynamic beam forming selects, and remaining (N_{H, sd}=N_H- N_{H, d}A hypothesis) it can be utilized to indicate the selected precoder group for the forming of half dynamic beam.

For convenience be used for twin-stage precoding subband precoding, be modeled as single-stage precoder Fig. 6, Fig. 7 and Above embodiment and exemplary several selective embodiments in Fig. 8 are extended to adapt to a pair of of PMI value (i₁, i₂), In, i₁(it can be by (the i for two-dimentional code book_1,1, i_1,2) constitute) it is broadband and i₂Subband.In this case, with i₁(its by (i for two-dimentional code book_1,1, i_1,2) constitute) associated amount of bits holding is identical, and divide with the quantity of PMI or UE resource With unrelated.That is, only one DCI field needs signaling i₁(it can be by (the i for two-dimentional code book_1,1, i_1,2) constitute), and It is unrelated with the quantity of PMI or UE resource allocation.Only with i₂Associated bit quantity can according to the quantity or UE resource allocation of PMI come Scaling changes.Therefore, precoding information only includes an i₁(it is by (the i for two-dimentional code book_1,1, i_1,2) constitute) and parameter with And possible multiple i₂(i₂Each value correspond to RB group).Particularly, for using the second level DL including subband PMI to control The embodiment 2 (the 720 of Fig. 7) of information, i₁It may include in DCI (or first order DCI), because of i₁(it can be by for two dimension (the i of code book_1,1, i_1,2) constitute) it is broadband.Because of i₂Subband, so including the subband PMI packet in second level DL control information Include the i for all subbands corresponding with the UL resource of distribution₂。

Any one of embodiment for supporting subband precoding suitable for dynamic beam shape, therefore can be used for The mechanism combination of half dynamic beam forming.That is, for precoder/beam-shaper circulation purpose, dynamic beam Forming can be associated with the DL control signaling mechanism for subband precoding, and half dynamic beam shapes and is used to indicate precoding Device group or the DL controlling mechanism of collection are associated.

In addition, when dynamically configuring dynamic and the forming of half dynamic beam for UE, it also can be via higher (RRC) Signaling configures UE by RB (" broadband " precoding) for all distribution or the single precoder of subband precoding.At this In the case of kind, RRC parameter is used for pre- by " broadband " precoding (the single precoder of the RB for all distribution) or subband (may be multiple precoders, subset of each precoder for the RB of distribution) is encoded to configure UE.For example, can be used two Value RRC parameter SubbandPrecodingEnabled.When its value is " true (TRUE) " or " conducting (ON) ", UE subband is pre- Coding is to configure.In this case, it according to one in four aforementioned embodiments for subband precoding, can be used more A PMI (including a PMI, and this depends on embodiment).When its value is " false (FALSE) " or " shutdown (OFF) ", UE is used " broadband " precoding configures.In this case, unrelated with UE resource allocation, use a PMI.

For the 4th component (that is, supporting the UL transmission based on reciprocity), when UL-DL channel reciprocity is feasible, example Such as TDD scene, UE can obtain the estimation of UL channel from measurement DL CSI-RS.In this case, UE can be given money Source distribution calculates the precoder of their own.This is eliminated to via DL control channel signaling precoder information DCI field It needs.

Therefore, in an embodiment (4.1), the DCI of UL license only includes the quantity of the transport layer of no any PMI (that is, transmission rank).However, it should be noted that although UE can obtain the estimation of UL channel to obtain its precoder, due to not There are UL interference information (mainly intra-cell interference can only be measured via SRS and be obtained at gNB), so the precoder Calculating may be inaccuracy.This is especially relevant at UL multiuser MIMO (MU-MIMO).In order to solve the problems, such as this, in this public affairs The one of embodiment of several embodiments-or some combinations are proposed in opening to be utilized.

In another embodiment (4.2), available or phase identical as precoding information described in component 2 or 3 As precoding information.That is, for UL license DCI include precoding information, the precoding information include one or Multiple PMI, this depends on being configuration " broadband " or subband precoding and/or UE resource allocation.It is provided in application component 2 or 3 All embodiments for precoding information DCI field.

It only include the precoding information DCI of single field via DL control channel signaling in another embodiment (4.3) Field.The single field can indicate precoder group or collection.The precoder group can be obtained from predefined code book, and fixed Justice is the subset of all precoders in code book.Precoder subset selection can be indicated for via transmission RI or TRI to UE Each rank value complete.In this case, for given RI (or TRI) value, PMI (or TPMI) is indicated specific to RI The precoder subset or group of (or TRI) value.Selectively, precoder subset selection can be can with all of RI or TRI) It can be completed on the associated code book of value.It in this case, may include from a code book (value with RI/TRI It is associated) or multiple code books (associated with multiple values of RI/TRI) precoder single precoder subset or group.Cause This, can it is no it is any reference or only part refer to RI/TRI in the case where explain PMI/TPMI.

The precoder group or collection may include that should therefrom be selected by UE or combined precoder.That is, due to UE Can be by the way that the estimation of UL channel be obtained via CSI-RS using DL-UL channel reciprocity, therefore the UL channel estimation can be used for Precoder is selected from the combination of the precoder subset or group indicated via PMI or obtains precoder from it.Can (by GNB) UE is configured using to this limitation of precoder subset with the UL intra-cell interference caused by considering to be dispatched by gNB The case where knowledge, which gets off, selects precoder.Other UE are led by the UE for example, this selection of precoder can be minimized The intra-cell interference of cause or as other UE to intra-cell interference caused by the UE.Selectively, which can indicate to answer The precoder group avoided by UE.Can (by gNB) using to precoder subset it is this avoid configure UE with consider by The case where knowledge of UL intra-cell interference caused by gNB is dispatched, gets off to avoid to select precoder.For example, precoder is this Selection can aggravate as the UE to intra-cell interference caused by other UE or as other UE to intra-cell interference caused by the UE.

Signaling mechanism identical with the signaling mechanism for the forming of half dynamic beam can be used in this embodiment.Example Such as, if using single-stage precoder or code book, as shown in table 3, using for half dynamic beam forming with table 1 or The similar precoding group DCI signaling mechanism of table 2.Herein, G_pIndicate the pth group of B precoder.

The exemplary precoding information table of TDD scene: level-one precoder

[table 3]

PMI value i	Precoder group
		0	G₀
1	G₁
		2	G₂
…	…
		P-1	G_P-1

If signaling is only wrapped to the PMI field in the precoding information field of UE using twin-stage precoder or code book Include the first PMI i for also illustrating that precoder group₁(it can be by (the i for two-dimentional precoder_1,1, i_1,2) constitute).It is this pre- Code set signaling is " broadband ", that is, for any UE resource allocation only one field of signaling.

Any of above three embodiment be used equally for wherein DL-UL channel reciprocity be feasible TDD scene. Selectively, at least two in these three embodiments can be supported and configured for UE via higher (RRC) signaling.

When DL CSI-RS is obtained and (especially calculated for precoder) for UL CSI, for this purpose, UE can It is configured by least one CSI-RS resource.CSI-RS resource configuration can be identical as the resource distribution obtained for DL CSI Or it is different.Typical CSI-RS resource parameter may include such as quantity of the port CSI-RS, time domain behavior in the resource distribution (it includes that subframe frequency displacement and periodically-is suitable for periodically and half for (periodically, semi-persistent or aperiodicity), sub-frame configuration Persistence CSI-RS), EPRE (energy of every RE) or power level, CSI-RS mode (in a time slot/subframe, also wrap Include frequency density) and when can configure more than one CSI-RS resource, the quantity (K >=1) of NZP CSI-RS resource.

It is obtained if it is UL CSI and configures identical CSI-RS resource using with the CSI-RS resource obtained for DL CSI Configuration, then higher (RRC) parameter may be used to indicate CSI-RS resource configuration correspond to DL measurement or UL measurement (for example, CSI, channel or interference measurement -- notice that UL and DL interference overview typical case is nonreciprocity).Selectively, the instruction may include In the resource setting obtained for UL CSI or measure setup.Selectively, by configuring UE with K >=1 CSI-RS resource And via the relevant DCI of MAC CE or UL to UE dynamically signaling CSI-RS resource index, can avoid from UL measure to area Divide the instruction that uses of the CSI-RS between DL.Which in the CSI-RS resource of K configuration CSI-RS resource index indicate A N (for example, N=1) is assigned to UE to carry out UL CSI measurement/acquisition.In this case, in K CSI-RS resource Its own parameter (port number, sub-frame configuration as applicable, mode etc.) can each be distributed.

When UE by the CSI-RS resource that is measured for UL CSI to configure when, CSI or precoder calculating can also be applied Addition of constraints.For example, it is assumed that the quantity for the UE antenna port calculated of the CSI using DL CSI-RS can be arranged to be used for phase The quantity of the SRS antenna port for the SRS resource setting answered.Another possible constraint that UE may be assumed that is the band of CSI-RS transmission It is wide.When for UL measuring configuration CSI-RS resource, transmission bandwidth can be arranged to UL transmission bandwidth, relevant to UL is included in The RB of UL resource allocation associated (especially related to aperiodicity CSI-RS) in DCI or preconfigured value are (via more The value of high level/RRC, MAC CE or L1DL control signaling (such as DCI) signaling).

In order to facilitate DL-UL channel reciprocity is used to transmit for UL, several selective embodiments can be used.

In one embodiment, in addition to " subband PMI " (one PMI of each subband in resource/RB of distribution) and " wide Except PMI " (PMI for indicating all subbands in resource/RB of distribution), additional " no PMI " configuration can be also added And/or " set/group of precoder " configuration.PMI configuration can be configured with transmission plan and is used together.

In another embodiment, other than existing transmission plan, it also can define individual UL transmission plan.Example Such as, in addition to " dynamic beam forming " (or transmission plan 1) and " forming of half dynamic beam " (or transmission plan 2, such as based on multiplicity Property transmission plan) except, can define " based on reciprocity " or transmission plan 3).For example, when UE uses " based on reciprocity " Transmission plan (or transmission plan 3) is come when configuring, the precoding information (PMI) in the relevant DCI of UL can be construed to UE's by UE The set of precoder/group indicator.Based on the DL channel measurement from CSI-RS, UE can be obtained via DL-UL channel reciprocity Take the estimation of UL channel.Then, which can be used for from the combination of the precoder subset or group that indicate via PMI Selection precoder obtains precoder from it.Through this process, UE can calculate single precoding for the RB of all distribution Device, or for one precoder of each calculating in the RB of distribution.This precoder calculating may specify to or leave for UE Implementation.

In yet another embodiment, individually configuration can be defined as indicating that UE is with " based on reciprocity " or " based on non- The UL of reciprocity " is transmitted or precoder calculates or PMI mode (or referred to as PMI is explained) configures.The configuration can be via more High-rise (RRC) or L1/L2 control signaling (DCI or MAC CE) carry out signaling.Similarly, when UE with " based on nonreciprocity " operate come When configuration, UE the precoding information (PMI) in the relevant DCI of UL can be construed to the set of the precoder for UE/group Indicator.Based on the DL channel measurement from CSI-RS, UE can obtain the estimation of UL channel via DL-UL channel reciprocity.So Afterwards, the UL channel estimation can be used for from the combination of the precoder subset or group that are indicated via PMI select precoder or from It obtains precoder.Similarly, through this process, UE can calculate single precoder, Huo Zhezhen for the RB of all distribution To one precoder of each calculating in the RB of distribution.This precoder calculating may specify to or leave for UE implementation.

The embodiment 4.3 of 4th component assume that using instruction distribution precoder subset/group single PMI/ TPMI is described.Therefore, if UE transmits frequency selectivity precoding applied to corresponding UL, UE is all distribution RB assumes identical precoder subset/group.However, may span across the high frequency scene of wide frequency ranges for the RB wherein distributed, The single precoder group of RB for all distribution may be inadequate.Therefore, multiple in the modification of present embodiment PMI/TPMI may include in the relevant DCI of UL, wherein precoder group/son of each PMI/TPMI instruction for particular sub-band Group distribution.That is, precoder group/subset allocation is frequency selectivity.For the modification, apply about in UL phase Any embodiment of the second component of signaling subband PMI/TPMI in the DCI of pass.In this case, it is used for precoder Group/subset allocation subband size or configuration can be identical or different with the subband size distributed for precoder or configuration.

For the 5th component (that is, supporting double wave shape UL transmission), UL transmission can support that (CP-OFDM has circulation to OFDM The OFDM of prefix) and DFT-S-OFDM (DFT extends OFDM), wherein DFT-S-OFDM is used for single-stream transmission.In such case Under, several possible embodiments can be described as follows.

In an embodiment (5.1), when UE with UL SU-MIMO to configure when, UE using CP-OFDM physically UL data are sent on Downlink channels (being modeled as LTE PUSCH), and it is unrelated with transmission rank (quantity of transport layer).When UE is mono- Defeated (non-UL SU-MIMO, without rank adaptation ability) is spread come when configuring, UE can be matched with CP-OFDM or DFT-S-OFDM It sets.The configuration can be via higher (RRC) signaling, MAC control element (MAC CE) or (including in the relevant DCI of UL) L1DL control signaling carrys out signaling.

In a modification (embodiment 5.2) of embodiment 5.1, for single-stream transmission, UE can be via uplink Its own selection of channel (to network or gNB) signaling for Multiple Access scheme (waveform), and non-reception configuration signal.The signaling can It is included as a part of UL data transmission or transmits (transmission in such as UL control channel) for individual UL.

In another modification (embodiment 5.3) of embodiment 5.1, other than the description as described in embodiment 5.1, Also support following additional UE processing.When UE with UL SU-MIMO to configure when, support single-stream transmission based on DFT-S-OFDM Retract (fallback) transmission plan.This fall-back transmission can via to transmit that different, UL is relevant for UL SU-MIMO DCI is that UE is dynamically scheduled.This? rollback DCI? size can significantly less than UL SU-MIMO transmit size, and Positioned at from the identical search space in search space transmitted for UL SU-MIMO or different search spaces (for example, public search Rope space) in.The fall-back transmission scheme can be with the fall-back transmission for transmitting associated single-stream transmission with non-UL SU-MIMO Scheme is identical or different.For example, this biography can be used when being in covering limited situation with the UE of UL SU-MIMO transmission configuration Transmission scheme.

In another embodiment (5.4), when UE with UL SU-MIMO to configure when, UE use for order -2 (bilayer pass It is defeated) or more CP-OFDM UL data are physically transmitted on Downlink channels (being modeled as LTE PUSCH).It is (single for order -1 Layer transmission), UE can be configured to be transmitted with CP-OFDM or DFT-S-OFDM.The configuration can via higher (RRC) signaling, MAC CE or L1DL control signaling carrys out signaling.For a kind of last scheme (via L1DL control signaling), passed with UL SU-MIMO The relevant DCI of defeated associated UL includes indicating to use which waveform (CP-OFDM or DFT-S-OFDM) when the value of RI is 1 Its of one bit DCI field or the two hypothesis (CP-OFDM or DFT-S-OFDM) and such as RI and/or precoding hypothesis It is assumed that jointly encoding.

In addition, being used single precoder (frequency non-selective precoder) when UE is transmitted with DFT-S-OFDM.

For the embodiment, when UE is configured with single-stream transmission (non-UL SU-MIMO, without rank adaptation ability) When, UE can be configured with CP-OFDM or DFT-S-OFDM.Similarly, which can control via higher (RRC) signaling, MAC Element (MAC CE) or (including in the relevant DCI of UL) L1DL control signaling carry out signaling.

For all above embodiment, whenever using DFT-S-OFDM, usable wherein UE is configured to continuous The DFT-S-OFDM (Single Carrier Frequency Division Multiple Access, SC-FDMA) for the single carrier version transmitted in PRB set.

For all above embodiment, whenever using single-stream transmission, transmission diversity or single-ended port transmission can be used.

The title of UL transmission channel or waveform is exemplary, and can in the essence for not changing the embodiment and/or In the case where function, replaced with other titles or label.

Fig. 9 shows the flow chart of the illustrative methods 900 according to disclosure embodiment, and wherein UE is received passes for UL Defeated UL license, the UL license for UL transmission includes precoding information field associated with multiple precoders.For example, side Method 900 can be executed by UE 116.

Method 900 starts from UE and receives the UL license (step 901) transmitted for UL, and to associated with UL license , the precoding information field in DCI be decoded, wherein precoding information field include at least it is corresponding with multiple precoders PMI (step 902).The composition of precoding information field depends on the function (step 903) of PMI.If PMI is pre- for subband Coding instruction, then the quantity of PMI at least equal to precoder quantity, and at least one PMI with correspond at least one RB Subband be associated (step 904).In an option, as indicated in UL resource allocation (RA) field of DCI, PMI's Quantity can be fixed, and the quantity of the RB of each subband depends on the RB of distribution.For example, the quantity of PMI is at least two, And DCI further includes for one subband indicator field in PMI.In another option, it is associated with subband at least One PMI and the DCI separately send for including RA field.If PMI is indicated for precoder group, the quantity of PMI is 1, PMI Indicate the group (step 905) including multiple precoders.In this case, UE selects precoder, Huo Zhecong from the group The combination of at least two precoders in the group obtains precoder with the UL transmission for being licensed.Based on this function, Determine precoder (step 906) in each of the RB for distribution.UE further carries out precoding to data stream, then exists The UL channel data flow (step 907).The UL channel can be UL control channel (being modeled as LTE PUCCH), UL data The combination of channel (being modeled as LTE PUSCH) or both.

Figure 10 shows the flow chart of the illustrative methods according to disclosure embodiment, and wherein BS, which is generated, has for UE At least one PMI (being labeled as UE-k) precoding information field.For example, method 1000 can be executed by BS 102.

It is that UE-k generates the precoding information DCI field (step at least one PMI that method 1000, which starts from BS, 1001).The composition of precoding information field depends on the function (step 1002) of PMI.If PMI refers to for subband precoding Show, then the quantity of PMI at least equal to precoder quantity, and at least one PMI with correspond at least one RB subband Associated (step 1003).In an option, as indicated in UL resource allocation (RA) field of DCI, the quantity of PMI can To be fixed, and the quantity of the RB of each subband depends on the RB of distribution.For example, the quantity of PMI is at least two, and DCI It further include for one subband indicator field in PMI.In another option, at least one PMI associated with subband With the DCI separately send including RA field.If PMI is indicated for precoder group, the quantity of PMI is 1, and PMI Indicate the group (step 1004) including multiple precoders.Based on this function, BS generates the UL with DCI and is permitted to can be used for pair UE-k carries out UL transmission (step 1005), and permits (step 1006) to UE-k transmission UL on DL channel.The transmission can be through LTE (is modeled as by DL control channel (being modeled as LTE PDCCH or ePDCCH) or DL control channel and DL data channel PDSCH combination between) is completed.

Although Fig. 9 and Figure 10 respectively illustrate the example of the method for receiving configuration information and configuration UE, can be right Fig. 9 and Figure 10 carries out various changes.Although the various steps in each figure can be overlapped for example, be shown as a series of steps, Concurrently occur, occur in a different order, occur repeatedly or do not executed in one or more embodiments.

It, can be from those skilled in the art or to ability although describing the disclosure by illustrative embodiments Field technique personnel suggest various changes and modifications.The disclosure is intended to comprising falling into these in the range of appended claims Change and modifies.

Claims

1. user equipment (UE), comprising:

Transceiver is configured to receive the UL license for uplink (UL) transmission；And

Processor, is operably connected to the transceiver, and the processor is configured to under associated with UL license Precoding information field in downlink control information (DCI) is decoded, wherein the precoding information field include with it is more At least one corresponding precoding matrix indicators (PMI) of a precoder, and

Wherein, the transceiver is configured to:

Precoding is carried out to data stream according to the precoder indicated by the precoding information field；And

By the data flow through precoding in UL channel.

2. UE as described in claim 1, wherein the quantity including the PMI in the precoding information field at least equal to The quantity of the precoder, and at least one of multiple described PMI with correspond at least one resource block (RB) son Band is associated.

3. UE as claimed in claim 2, wherein the quantity of PMI is fixed, and the quantity of the RB of each subband depends on Such as the RB of distribution indicated in UL resource allocation (RA) field of the DCI.

4. UE as claimed in claim 3, wherein the quantity of PMI is at least two, and the DCI further includes for described One subband indicator field in PMI.

5. UE as claimed in claim 2, wherein at least one PMI associated with subband with include resource allocation (RA) word The DCI of section is dividually sent.

6. UE as described in claim 1, wherein the precoding information field includes single PMI, and the single PMI Indicate the group including the multiple precoder.

7. UE as claimed in claim 6, wherein the processor is configured to select precoder from described group, or The combination of at least two precoders from described group obtains precoder with the UL transmission for being licensed.

Base station 8. (BS), comprising:

Processor is configured to:

Precoding information field is generated in down link control information (DCI)；

Generate the UL license for uplink (UL) transmission to user equipment (UE)；And

Transceiver, is operably connected to the processor, and the transceiver is configured to via downlink (DL) channel to institute It states UE and transmits the UL license；

Wherein, the DCI is associated with UL license, and the precoding information field includes and multiple precoders pair At least one precoding matrix indicators (PMI) answered.

9. BS as claimed in claim 8, wherein the quantity including the PMI in the precoding information field at least equal to The quantity of the precoder, and at least one of multiple PMI with correspond at least one resource block (RB) subband phase Association.

10. BS as claimed in claim 9, wherein the quantity of the PMI is fixed, and the resource of each subband The quantity of block depends on the resource block of distribution indicated in UL resource allocation (RA) field such as the DCI.

11. BS as claimed in claim 10, wherein the quantity of PMI is at least two, and the DCI further includes for institute State one subband indicator field in PMI.

12. BS as claimed in claim 9, wherein at least one PMI associated with subband with include resource allocation (RA) word The DCI of section is dividually sent.

13. BS as claimed in claim 8, wherein the precoding information field includes single PMI, and the single PMI Indicate the group including the multiple precoder.

14. the method for operating user equipment (UE), which comprises

UL license for uplink (UL) transmission is received by the UE；

It is carried out by the precoding information field in described UE pairs down link control information (DCI) associated with UL license Decoding, wherein the precoding information field includes at least one precoding matrix indicators corresponding with multiple precoders (PMI)；

Precoding is carried out to data stream according to the precoder indicated by the precoding information field by the UE；And

By the UE in data flow of the UL channel through precoding.

15. the method for operating base station (BS), which comprises

The UL license is sent to the UE via downlink (DL) channel；