KR102638709B1 - Method and apparatus for channel state information reference signal (CSI-RS) - Google Patents

Abstract

Method and apparatus for Channel State Information Reference Signal (CSI-RS) reporting. A method of operating a user equipment (UE) includes receiving and decoding higher layer configuration information for N CSI reporting settings and M resource settings. The method also includes receiving a downlink control information (DCI) field including a downlink control information (DCI) field to request aperiodic CSI reporting. This method further includes calculating CSI according to configuration information and DCI and transmitting the calculated CSI on an uplink (UL) channel. N is at least 1, M is greater than 1, and the DCI field contains a selection of one of X _STATE configuration states.

Description

Method and apparatus for channel state information reference signal (CSI-RS)

This disclosure generally relates to methods for enabling Channel State Information Reference Signal (CSI-RS) resource allocation. Such methods may be used when the user device is equipped with multiple transmit antennas and transceivers.

Since the deployment of fourth generation (4G) communication systems, there have been efforts to develop improved fifth generation (5G) or pre-5G communication systems to meet the increasing demand for wireless data traffic. 5G or pre-5G communication system is also called 'Beyond 4G (post-4G) network' or 'Post LTE (long term evolution) system'. The 5G communication system is being considered for implementation in higher frequency (mmWave) bands, such as the 60Ghz band, to achieve higher data transmission rates. To reduce propagation loss and increase transmission distance, beamforming, massive MIMO, Full Dimensional MIMO (FD-MIMO), and array antenna are used. ), analog beam-forming, and large scale antenna technologies are being discussed in relation to 5G communication systems. In addition, to improve the network of the system, the 5G communication system uses advanced small cells, advanced small cells, cloud radio access networks (cloud RAN), and ultra-dense networks. , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation. Technology development is underway. In the 5G system, advanced coding modulation (ACM) methods such as FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), advanced access technologies such as FBMC (Filter Bank Multi Carrier) and NOMA (non orthogonal) are used. Multiple access), and SCMA (sparse code multiple access) are being developed.

Meanwhile, the Internet is evolving from a human-centered network where humans create and consume information to an IoT (Internet of Things) network that exchanges and processes information between distributed components such as objects. IoE (Internet of Everything) technology, which combines IoT technology with big data processing technology through connection to cloud servers, etc., is also emerging. In order to implement IoT, technological elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required. Recently, sensor networks for connection between things, and machine to machine communication (Machine to Machine) are required to implement IoT. , M2M), and MTC (Machine Type Communication) technologies are being researched. In such an IoT environment, intelligent IT (Internet Technology) services that create new value in human life by collecting and analyzing data generated from connected objects can be provided. IoT is used in fields such as smart home, smart building, smart city, smart car or connected car, smart grid, healthcare, smart home appliances, and advanced medical services through the convergence and combination of existing IT (information technology) technology and various industries. It can be applied to .

In addition, various attempts are being made to apply the 5G communication system to the IoT network. For example, technologies such as sensor network, Machine to Machine (M2M), and MTC (Machine Type Communication) are being implemented by 5G communication technologies such as beam forming, MIMO, and array antenna. will be. The application of cloud radio access network (cloud RAN) as the big data processing technology described above can be said to be an example of the convergence of 5G technology and IoT technology.

As described above, various services may be provided as wireless communication systems develop, and accordingly, a method for easily providing such services is required.

According to one embodiment, a method and apparatus may be provided to sufficiently accommodate reporting of channel state information.

Various embodiments of the present disclosure provide methods and devices for CSI-RS resource allocation.

In one embodiment, a user equipment (UE) is provided. The UE includes a communication unit and a processor communicatively connected to the communication unit. The communication unit is configured to receive upper layer setting information for N channel state information (CSI) reporting settings and M resource settings, and to receive DCI including a downlink control information (DCI) field for aperiodic CSI reporting requests. do. The processor is configured to decode the configuration information and DCI and calculate CSI according to the configuration information and DCI. The communication unit is further configured to transmit the calculated CSI to an uplink (UL) channel. N is at least 1, M is greater than 1, and the DCI field indicates a selection of one of the XSTATE configuration states.

In another embodiment, a base station (BS) is provided. The BS includes a processor and a communication unit communicatively connected to the processor. The processor is configured to generate a DCI including (i) upper layer configuration information for N CSI reporting settings and M resource settings, and (ii) a DCI field for an aperiodic CSI reporting request. The communication unit is configured to transmit the configuration information and the DCI to the UE through one or more downlink (DL) control channels, and receive a CSI report calculated according to the configuration information and the DCI from the UE on a UL channel. N is at least 1, M is greater than 1, and the DCI field contains a selection of one of X _STATE configuration states.

In another embodiment, a method of operating a UE is provided. The method includes receiving and decoding upper layer configuration information for N CSI reporting configurations and M resource configurations. The method also includes receiving a DCI including a DCI field for requesting aperiodic CSI reporting. The method further includes calculating CSI according to the configuration information and the DCI and transmitting the calculated CSI on an uplink (UL) channel. N is at least 1, M is greater than 1, and the DCI field contains a selection of one of X _STATE configuration states.

According to one embodiment, a method and apparatus are provided for sufficiently accommodating reporting of channel state information.

1 illustrates an example wireless network in accordance with various embodiments of the present disclosure.
2A and 2B illustrate example wireless transmission and reception paths according to various embodiments of the present disclosure.
3A illustrates example user equipment according to various embodiments of the present disclosure.
3B illustrates an example base station (BS) according to various embodiments of the present disclosure.
Figure 4 shows an example beamforming structure in which one CSI-RS port is mapped to a large number of analog controlled antenna elements.
Figure 5 shows an example of CSI-RS resource or resource set selection according to an embodiment of the present disclosure.
Figure 6 shows two examples of two-step CSI-RS resource or resource set selection for aperiodic CSI according to an embodiment of the present disclosure.
Figure 7 shows an example of two-step triggering for aperiodic CSI according to an embodiment of the present disclosure.
8A-8B illustrate two-stage triggering examples for aperiodic CSI according to embodiments of the present disclosure.
FIG. 9 shows a flow diagram for an example method for a UE to receive and decode CSI reporting and resource configuration information, according to an embodiment of the present disclosure.
FIG. 10 shows a flow diagram for an example method for a BS to generate and transmit CSI reporting and resource configuration information for a UE (labeled UE-k), according to an embodiment of the present disclosure.

Wireless communications has been one of the most successful innovations in modern history. Demand for wireless data traffic due to the increasing popularity among consumers and operators of smartphones and other mobile data devices such as tablets, “notepad” computers, netbooks, e-book readers, and machine-type devices. is increasing rapidly. To meet the rapid growth of mobile data traffic and support new applications and deployments, improvements in air interface efficiency and coverage are critical.

The mobile device or user device can measure the quality of the downlink channel and report that quality to the base station so that decisions can be made as to whether various parameters should be adjusted during communication with the mobile device. Existing channel quality reporting processes in wireless communication systems do not adequately accommodate reporting of channel state information associated with large two-dimensional array transmit antennas or antenna array geometries that typically accommodate large numbers of antenna elements.

This disclosure relates to a preliminary 5th generation (5G) or 5G communication system that will be provided to support higher data rates in 4th generation (4G) and later communication systems such as Long Term Evolution (LTE).

Other technical features will be apparent to those skilled in the art from the following drawings, detailed description and claims.

Before proceeding with the text below, it is advisable to explain the definitions of certain words and phrases used throughout this patent document. The word "join" and its derivatives refers to any direct or indirect communication between two or more components, whether or not they are in physical contact with each other. The terms “transmit,” “receive,” and “communicate,” as well as their derivatives, include both direct and indirect communication. The terms “comprise” and “comprising” and their derivatives mean inclusion without limitation. The word "or" is an inclusive word meaning 'and/or' and its derivatives include, are included in, are interconnected with, contain, are implied in, and are derived from Connected to, combined with, able to communicate with, cooperate with, interpose, place side by side, approximate to, be bound to, have, have the characteristics of, ~ It means having a relationship with. The term “controller” means any device, system, or portion thereof that controls at least one operation. Such controllers may be implemented in hardware or a combination of hardware and software and/or firmware. Functions associated with any particular controller may be centralized or distributed, either locally or remotely. The term "at least one of" when used with a list of items means that different combinations of one or more of the listed items may be used, and only one item in the list may be required. For example, “at least one of A, B, and C” includes any of the combinations of A, B, C, A and B, A and C, B and C, and A, B, and C.

Additionally, various functions described below may be implemented or supported by one or more computer programs, each of which consists of computer-readable program code and is implemented on a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, associated data, or portions thereof suitable for implementation in suitable computer-readable program code. The term “computer-readable program code” includes all types of computer code, including source code, object code, and executable code. The term "computer-readable media" refers to a computer-readable medium, such as read only memory (ROM), random access memory (RAM), hard disk drive, compact disk (CD), digital video disk (DVD), or any other type of memory. Includes all types of media that can be accessed by. “Non-transitory” computer-readable media excludes wired, wireless, optical, or other communication links that transmit transient electrical or other signals. Non-transitory computer-readable media includes media on which data can be permanently stored, and media on which data can be stored and later overwritten, such as rewritable optical disks or erasable memory devices.

Definitions of certain other words and phrases are provided throughout this patent document. Those skilled in the art will recognize that in many, if not most, cases, such definitions apply to prior as well as subsequent uses of the words and phrases so defined.

1-10 discussed below and the various embodiments used to describe the principles of the present disclosure in this patent document are examples only and should not be considered to limit the scope of the present disclosure in any way. Those skilled in the art will appreciate that the principles of this disclosure may be implemented in any suitably configured wireless communication system.

List of abbreviations

2D: Two-dimensional

MIMO: multiple-input multiple-output

SU-MIMO: single-user MIMO

MU-MIMO: multi-user MIMO

3GPP: 3rd generation partnership project

LTE: long-term evolution

UE: user equipment

eNB: evolved Node B or “eNB”

BS: base station

DL: downlink

UL: uplink

CRS: cell-specific reference signal(s)

DMRS: demodulation reference signal(s)

SRS: sounding reference signal(s)

UE-RS: UE-specific reference signal(s)

CSI-RS: channel state information reference signals

SCID: scrambling identity

MCS: modulation and coding scheme

RE: resource element

CQI: channel quality information

PMI: precoding matrix indicator

RI: rank indicator

MU-CQI: multi-user CQI

CSI: channel state information

CSI-IM: CSI interference measurement

CoMP: coordinated multi-point

DCI: downlink control information

UCI: uplink control information

PDSCH: physical downlink shared 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 departure

The following documents and specifications are incorporated by reference into this disclosure as if fully set forth herein: 3GPP Technical Specification (TS) 36.211 Version 12.4.0, “E-UTRA, Physical channels and modulation (Physical Channels and Modulation)" ("REF 1"); 3GPP TS 36.212 Version 12.3.0, “E-UTRA, Multiplexing and Channel coding” (“REF 2”); 3GPP TS 36.213 Version 12.4.0, “E-UTRA, Physical Layer Procedures” (“REF 3”); 3GPP TS 36.321 Version 12.4.0, “E-UTRA, Medium Access Control (MAC) Protocol Specification” (“REF 4”); 3GPP TS 36.331 Version 12.4.0, “E-UTRA, Radio Resource Control (RRC) Protocol Specification” (“REF 5”); 3GPP Technical Specification (TS) 38.211 Version 15.0.0, “NR, Physical channels and modulation” (“REF 6”); 3GPP TS 38.212 Version 15.0.0, “NR, Multiplexing and Channel coding” (“REF 7”); 3GPP TS 38.213 Version 15.0.0, “NR, Physical Layer Procedures for Control” (“REF 8”); 3GPP TS 38.214 Version 15.0.0, “NR, Physical Layer Procedures for Data” (“REF 9”); 3GPP TS 38.321 Version 15.0.0, “NR, Medium Access Control (MAC) Protocol Specification” (“REF 10”); and 3GPP TS 38.331 Version 15.0.0, “NR, Radio Resource Control (RRC) Protocol Specification” (“REF 11”).

There have been efforts to develop improved 5G or pre-5G communication systems to meet the increasing demand for wireless data traffic following the deployment of 4G communication systems. Accordingly, the 5G or pre-5G communication system is also called 'Beyond 4G (post-4G) network' or 'Post LTE system'.

The 5G communication system is being considered for implementation in higher frequency (mmWave) bands, such as the 60Ghz band, to achieve higher data transmission rates. To reduce propagation loss and increase transmission distance, beamforming, massive MIMO, Full Dimensional MIMO (FD-MIMO), and array antenna are used. ), analog beam-forming, and large scale antenna technologies are being discussed in 5G communication systems.

In addition, to improve the network of the system, the 5G communication system uses advanced small cells, advanced small cells, cloud radio access networks (cloud RAN), and ultra-dense networks. , Device to Device communication (D2D), wireless backhaul, moving network, cooperative communication, CoMP (Coordinated Multi-Points), and interference cancellation. Technology development is underway.

In the 5G system, advanced coding modulation (ACM) methods such as FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), advanced access technologies such as FBMC (Filter Bank Multi Carrier) and NOMA (non orthogonal) are used. Multiple access), and SCMA (sparse code multiple access) are being developed.

1 illustrates an example wireless network 100 in accordance with various embodiments of the present disclosure. The embodiment of wireless network 100 shown in Figure 1 is for illustration purposes only. Other embodiments of wireless network 100 may be used without departing from the scope of this disclosure.

Wireless network 100 includes a base station (BS) 101, BS 102, and BS 103. BS 101 communicates with BS 102 and BS 103. BS 101 also communicates with at least one Internet Protocol (IP) network 130, such as the Internet, a private IP network, or another data network. Instead of "BS", optional terms such as "eNB" (enhanced Node B) or "gNB" (general Node B) may also be used. Depending on the network type, other well-known terms such as "base station" or "access point" may be used instead of "gNB" or "BS". For convenience, configure a network infrastructure to provide wireless access to remote terminals. The terms “gNB” and “BS” are used within this patent document to refer to the elements. Additionally, depending on the network type, other well-known terms such as “user equipment” or “UE”, “mobile station”, “subscriber station”, “remote terminal”, “wireless terminal”, or “user equipment” may be used. For convenience, the terms "user device" and "UE" are used throughout this patent document to refer to a UE, whether a mobile device (such as a mobile phone or smartphone) or a stationary device (such as a desktop computer or bending machine). However, it is used to refer to a remote wireless device that wirelessly accesses the gNB.

gNB 102 provides wireless broadband access to network 130 to a first plurality of user devices (UEs) within a coverage area 120 of gNB 102. The first plurality of UEs include UE 111, which may be located within a small business (SB); UE 112, which may be located within an enterprise (E), UE 113, which may be located within a WiFi hotspot (HS); UE 114, which may be located within the first residence (R); UE 115 that may be located within the second residence (R); and UE 116, which may be a mobile device (M) such as a cell phone, wireless laptop, wireless PDA, etc. gNB 103 provides wireless broadband access to network 130 to a plurality of second UEs within coverage area 125 of gNB 103. The second plurality of UEs include UE 115 and UE 116. In some embodiments, one or more of the gNBs 101-103 may communicate with each other and with the UEs 111-116 using 5G, LTE, LTE-A, WiMAX, or other advanced wireless communication techniques. You can.

The dotted lines show the approximate extent of coverage areas 120 and 125, which are shown as roughly circular shapes for purposes of illustration and explanation only. It should be clearly understood that the coverage areas associated with gNBs, such as coverage areas 120 and 125, may have different shapes, including irregular shapes, depending on the configuration of the gNBs and variations within the wireless environment related to natural and man-made obstacles. You can.

As will be described in more detail below, one or more of gNB 101, gNB 102, and gNB 103 send measurement reference signals to UEs 111-116, and perform the measurement reference signals as described in embodiments of the present disclosure. Together, UEs 111-116 are set up for CSI reporting. In various embodiments, one or more of the UEs 111-116 receives a channel state information reference signal (CSI-RS).

Although Figure 1 shows an example of a wireless network 100, various variations may be made to Figure 1. For example, wireless network 100 may include any number of gNBs and any number of UEs in any suitable arrangement. gNB 101 may also communicate directly with any number of UEs and provide them with wireless broadband access to network 130. Likewise, each gNB 102 - 103 may communicate directly with network 130 to provide UEs with direct wireless broadband access to network 130 . Additionally, gNB 101, 102, and/or 103 may provide access to other or additional external networks, such as an external telephone network or other types of data networks.

2A and 2B illustrate example wireless transmission and reception paths according to the present disclosure. In the following, transmit path 200 may be described as being implemented at a gNB (such as gNB 102) and receive path 250 may be described as being implemented at a UE (such as UE 116). You can. However, it will also be appreciated that the receive path 250 may be implemented in a gNB and the transmit path 200 may be implemented in a UE. In some embodiments, receive path 250 is configured to receive CSI-RS as described in embodiments of this disclosure.

The transmission path 200 includes a channel coding and modulation block 205, a serial-to-parallel (S-to-P) block 210, an N size inverse fast Fourier transform (IFFT) block 215, and a parallel-to-serial (P) block. -to-S) block 220, cyclic prefixcyclic prefix addition block 225, and up-converter (UC) 230. The receiving path 250 includes a down-converter (DC) 255, a cyclic prefix removal block 260, a serial-to-parallel (S-to-P) block 265, and an N-size fast Fourier transform (FFT). ) block 270, parallel-to-serial (P-to-S) block 275, and channel decoding and demodulation block 280.

In the transmission path 200, the channel coding and modulation block 205 receives a set of information bits, applies coding (such as convolutional or turbo or low-density parity check (LDPC) coding), and encodes the input bits. By modulating them (using Quadrature Phase Shift Keying (QPSK) or Quadrature Amplitude Modulation (QAM)), a sequence of frequency domain modulation symbols is generated. The S-to-P block 210 converts the serially modulated symbols into parallel data ( (such as demultiplexing). The N-sized IFFT block 215 performs an IFFT operation on N parallel symbol streams to generate time domain output signals. The P-to-S block 220 transforms (such as multiplexing) the parallel time domain output symbols from the size N IFFT block 215 to generate a serial time domain signal. The cyclic prefix addition block 225 inserts a cyclic prefix into the time domain signal. UC 230 modulates (such as upconverts) the output of cyclic prefix addition block 225 to an RF frequency for transmission over a wireless channel. The signal may be filtered at baseband before conversion to RF frequencies.

The RF signal transmitted from gNB 102 reaches UE 116 after passing through the wireless channel, and operations opposite to those in gNB 102 are performed at UE 116. DC 255 down-converts the received signal to baseband frequency, and cyclic prefix removal block 260 removes the cyclic prefix to generate a serial time domain baseband signal. Serial-to-parallel block 265 converts the time domain baseband signal to parallel time domain signals. The N-sized FET block 270 performs an FFT algorithm to generate N parallel frequency domain signals. Parallel-to-serial block 275 converts parallel frequency domain signals into a sequence of modulated data symbols. The channel decoding and demodulation block 280 demodulates and decodes the modulated symbols to recover the original input data stream.

As will be described in more detail below, the transmission path 200 or the reception path 250 may perform signaling for CSI reporting. Each of the eNBs 101-103 may implement a transmission path similar to downlink transmission to the user devices 111-116 and a receive path similar to uplink reception from the user devices 111-116. Likewise, each of the UEs 111-116 may implement a transmit path for uplink transmission to gNBs 101-103 and a receive path for downlink reception from gNBs 101-103. there is.

Each of the components of FIGS. 2A and 2B may be implemented using only hardware or a combination of hardware and software/firmware. As a specific example, at least some of the components of FIGS. 2A and 2B may be implemented through software, and other components may be implemented through configurable hardware or a mixture of software and configurable hardware. For example, FFT block 270 and IFFT block 215 may be implemented as configurable software algorithms, where the value of size N may vary depending on the implementation.

Additionally, although it has been described that FFT and IFFT are used, this is merely an example and should not be construed as limiting the scope of the present disclosure. Other types of transforms may also be used, such as discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT) functions. In DFT and IDFT functions, the value of variable N can be any integer (1, 2, 3, 4, etc.), and in FFT and IFFT functions, the value of variable N can be any integer that is a power of 2 (1, It can be expected that it may be 2, 4, 8, 16, etc.).

Although Figures 2A and 2B show examples of wireless transmission and reception paths, various changes may be made to Figures 2A and 2B. Additionally, various components in FIGS. 2A and 2B may be combined, further subdivided, or omitted, and additional components may be added according to specific needs. Figures 2A and 2B are also intended to illustrate examples of the types of transmit and receive paths that may be used in a wireless network. Other suitable structures may be used to support wireless communications within a wireless network.

3A shows an example UE 116 according to this disclosure. The embodiment of UE 116 shown in FIG. 3A is merely exemplary, and UEs 111 - 115 in FIG. 1 may have the same or similar configuration. However, UEs come in a wide range of configurations, and FIG. 3A does not limit the scope of this disclosure to any particular implementation of a UE.

UE 116 includes an antenna 305, a radio frequency (RF) communication unit 310, a transmit (TX) processing circuit 315, a microphone 320, and a receive (RX) processing circuit 325. UE 116 also includes speaker 330, processor 340, input/output (I/O) interface (IF) 345, input 350, display 355, and memory 360. Memory 360 includes an operating system (OS) program 361 and one or more applications 362.

The RF communication unit 310 receives the received RF signal transmitted by the gNB of the wireless network 100 of FIG. 1 from the antenna 305. The RF communication unit 310 down-converts the received RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to RX processing circuitry 325, which filters, decodes and/or binarizes the baseband or IF signal to generate a processed baseband signal. RX processing circuit 325 transmits the processed baseband signal to speaker 330 (such as voice data) or processor 340 (such as web browsing data).

TX processing circuitry 315 receives analog or digital voice data from microphone 320 or baseband data (web data, email, or interactive video game data) outgoing from processor 340. TX processing circuitry 315 encodes, multiplexes, and/or binarizes transmitted baseband data to generate processed baseband or IF signals. The RF communication unit 310 receives the processed and transmitted baseband or IF signal from the TX processing circuit 315, and up-converts the baseband or IF signal transmitted through the antenna 305 into an RF signal.

The processor 340 may include one or more processors or other processing devices, and executes the OS program 361 stored in memory to control the overall operation of the UE 116. For example, the processor 340 controls the reception of forward channel signals and the transmission of reverse channel signals by the RF communication unit 310, the RX processing circuit 325, and the TX processing circuit 315 according to well-known principles. can do. In some embodiments, processor 340 includes at least one microprocessor or microcontroller.

Processor 340 may also perform other operations residing in memory 360, such as operations for CSI-RS reception and measurement of systems described in embodiments of the present disclosure, as described in embodiments of the present disclosure. Can run processes and programs. Processor 340 may move data into or out of memory 360 as required by executing processes. In some embodiments, processor 340 is configured to execute applications 362 based on OS program 361 or in response to signals received from gNBs or operators. Processor 340 is also coupled with an I/O interface 345 that provides UE 116 with connectivity to other devices, such as laptop computers and handheld computers. I/O interface 345 is a communication path between these accessories and processor 340.

Processor 340 is also coupled with input 350 (e.g., keypad, touch screen, buttons, etc.) and display 355. An operator of UE 116 may input data into UE 116 using input unit 350 . Display 355 may be a liquid crystal display, or other display capable of rendering text and/or at least limited graphics, such as from web sites.

Memory 360 is coupled with processor 340. A portion of the memory 360 may include random access memory (RAM), and another portion of the memory 360 may include flash memory or other read-only memory (ROM).

As described in more detail below, UE 116 may perform signaling and calculations for CSI reporting. Figure 3A shows an example of UE 116, however, various variations may be made to Figure 3A. For example, various components in Figure 3A may be combined, further subdivided, or omitted, and additional components may be added according to specific needs. As a specific example, processor 340 may be partitioned into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Additionally, although Figure 3A shows UE 116 configured as a mobile phone or smartphone, UEs may also be configured to operate as other types of mobile or fixed devices.

FIG. 3B shows an example gNB 102 according to this disclosure. The embodiment of gNB 102 shown in FIG. 3B is merely illustrative and may have the same or similar configuration as other gNBs in FIG. 1 . However, gNBs come in a wide range of configurations, and FIG. 3B does not limit the scope of the present disclosure to any particular implementation of a gNB. gNB 101 and gNB 103 may include the same or similar structure as gNB 102.

As shown in FIG. 3B, gNB 102 includes multiple antennas 370a-370n, multiple RF communications units 372a-372n, transmit (TX) processing circuitry 374, and receive (RX) processing circuitry. Includes (376). In certain embodiments, one or more of the number of antennas 370a-370n includes 2D antenna arrays. gNB 102 also includes a controller/processor 378, memory 380, and a backhaul or network interface 382.

RF communications units 372a-372n receive receive RF signals, such as signals transmitted by UEs or other gNBs, from antennas 370a-370n. RF communication units 372a-372n down-convert received RF signals to generate IF or baseband signals. The IF or baseband signals are sent to RX processing circuitry 376, which filters, decodes and/or binarizes the baseband or IF signals to generate processed baseband signals. RX processing circuitry 376 transmits the processed baseband signals to controller/processor 378 for further processing.

TX processing circuitry 374 receives analog or digital data (such as voice data, web data, email, or interactive video game data) from controller/processor 378. TX processing circuitry 374 encodes, multiplexes, and/or binarizes transmitted baseband data to generate processed baseband or IF signals. The RF communication units 372a-372n receive the processed and transmitted baseband or IF signal from the TX processing circuit 374 and convert the baseband or IF signals transmitted through the antennas 370a-370n into RF signals. Convert upward.

Controller/processor 378 may include one or more processors or other processing devices that control the overall operation of gNB 102. For example, the controller/processor 378 receives forward channel signals and reverse channel signals by RF communications 372a-372n, RX processing circuitry 376, and TX processing circuitry 374 according to well-known principles. Transmission of signals can be controlled. Controller/processor 378 may also support additional functions, such as more advanced wireless communication functions. In some embodiments, controller/processor 378 includes at least one microprocessor or microcontroller.

Controller/processor 378 may also execute programs and other processes that reside in memory 380, such as an OS. Controller/processor 378 may also support channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the present disclosure. In some embodiments, controller/processor 378 supports communication between entities, such as Web RTC. Controller/processor 378 may move data into or out of memory 380 as required by an executing process.

Controller/processor 378 is also connected to backhaul or network interface 382. Backhaul or network interface 382 allows gNB 102 to communicate with other devices or systems over a backhaul connection or network. Backhaul or network interface 382 may support communications via any suitable wired or wireless connection(s). For example, when gNB 102 is implemented as part of a cellular communications system (such as 5G or a new radio access technology or one supporting NR, LTE, or LTE-A), the backhaul or network interface 382 may Allows gNB 102 to communicate with gNBs via a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the backhaul or network interface 382 allows the gNB 102 to connect over a wired or wireless local area network or through a wired or wireless connection to a larger network (such as the Internet). You can communicate. Backhaul or network interface 382 includes any suitable structures that support communication over a wired or wireless connection, such as Ethernet or RF communications.

Memory 380 is coupled with controller/processor 378. A portion of memory 380 may include RAM, and another portion of memory 380 may include flash memory or other ROM. In certain embodiments, a plurality of instructions, such as the BIS algorithm, are stored in memory. The plurality of instructions are configured to cause the controller/processor 378 to perform a BIS process and decode the received signal after removing at least one interference signal determined by the BIS algorithm.

As described in more detail below, the transmit and receive paths of gNB 102 (implemented using RF communications 372a-372n, TX processing circuitry 374, and/or RX processing circuitry 376) Allocate and transmit CSI-RS.

Figure 3b shows an example of gNB 102, however, various modifications to Figure 3b may occur. For example, gNB 102 may include a predetermined number of each component shown in FIG. 3A. As a specific example, an access point may include multiple backhaul or network interfaces 382 and a controller/processor 378 may support routing functions that route data between different network addresses. As another specific example, although shown as including one instance of TX processing circuitry 374 and one instance of RX processing circuitry 376, gNB 102 may include multiple instances of each (RF Communications Unit one per person, etc.).

Rel.13 LTE supports up to 16 CSI-RS antenna ports, allowing gNB to be equipped with multiple antenna elements (such as 64 or 128). In this case, multiple antenna elements are mapped onto one CSI-RS port. Additionally, up to 32 CSI-RS ports may be supported in Rel.14 LTE. For next-generation cellular systems such as 5G, the maximum number of CSI-RS ports is expected to remain approximately the same.

For mmWave bands, the number of antenna elements may be large for a given form factor, but the number of CSI-RS ports - which may correspond to the number of digitally precoded ports - may be large for the transmitter of Figure 4 ( As illustrated in 400), it tends to be limited due to hardware constraints (possibility of installing a large number of ADCs/DACs in the mmWave frequency band, etc.). In this case, one CSI-RS is mapped onto multiple antenna elements that can be controlled by analog phase shifters 401. One CSI-RS port can correspond to one sub-array that generates a narrow analog beam through analog beamforming 405. This analog beam is configured to sweep a wide range of angles 420 by varying a phase shifter bank over symbols or subframes or slots (a subframe or slot contains a collection of symbols). can be set. The number of sub-arrays (corresponding to the number of RF chains) is equal to the number of CSI-RS ports ( N _CSI-PORT ). The digital beamforming unit 410 performs linear combination across N _CSI-PORT analog beams to further increase the precoding gain. Analog beams are broadband (and therefore not frequency selective), but digital precoding can be varied across frequency subbands or resource blocks.

The UE is configured using CSI-RS for CSI measurement and reporting. The allocation unit for CSI-RS may be called a CSI-RS resource that can correspond to non-zero-power (NZP) or zero-power (ZP). NZP CSI-RS is mainly used for channel measurements, while ZP CSI-RS is used for interference measurements. For 5G NR, an NZP CSI-RS resource is defined as a set of NZP CSI-RS port(s) that are mapped to a set of REs within at least some frequency range/time duration that can be measured to derive CSI. Multiple NZP CSI-RS resources may be configured in the UE to support CoMP, beam management, and multi-beamformed CSI-RS based operations, where each NZP CSI-RS resource supports a different number of CSI-RSs. It can have ports.

CSI-RS resources may become scarce as they are used for multiple applications and/or a large number of UEs. Therefore, the introduction of an efficient CSI-RS resource sharing/pooling mechanism is necessary. However, this is usually achieved at the expense of dynamic signaling, especially in DL control channels. To avoid heavy downlink control information (DCI) payload and overloading of the PDCCH, RRC signaling and L2 MAC Control Element (MAC CE) may be used in conjunction with L1 DL control signaling. However, in 5G NR, RRC reset should be avoided to minimize higher-latency latency. Therefore, there is another need to design a signaling mechanism with a minimum DL control signaling payload (DCI payload, etc.) that helps efficient resource sharing.

This disclosure includes the following components that enable CSI-RS allocation, transmission, and/or reception. The first component is specifically related to CSI-RS resource allocation, including multiple resource sets for aperiodic CSI-RS (AP-CSI-RS). The second component concerns CSI-RS resource allocation in the case of multiple component carriers (CCs). The third component relates to aperiodic CSI (A-CSI) requests through DL allocation. Each of these components can be used by itself (without the other components) or in conjunction with at least one of the other components. Likewise, each of these components includes a plurality of sub-components. Each of the sub-components can be used by itself (without any other sub-components) or in conjunction with at least one of the other sub-components.

The following embodiments and sub-embodiments are described for CSI-RS resources or resource sets. However, they may also be used for types of RS resources or resource sets other than DMRS (demodulation RS), SRS (sounding reference signal), mobility RS, tracking RS, or beam management RS. Additionally, content regarding resources or resource sets alone may apply to ports or port sets, where one resource includes a plurality of ports.

The following components and embodiments can be applied to transmission through cyclic prefix OFDM (CP-OFDM) waveforms and DFT-spread OFDM (DFT-SOFDM) and single-carrier FDMA (SC-FDMA) waveforms. Additionally, the following components and embodiments may be applied to transmission when the time scheduling unit is one subframe (which may consist of one or multiple slots) or one slot.

In the first component (i.e., in CSI-RS resource allocation for multiple resource sets), in the following embodiments and sub-embodiments, the UE may be configured through resource settings, and each resource setting May include S ≥1 reference signal (CSI-RS, etc.) resource sets. Here, the resource is used for CSI or beam management related measurements and calculations. Using CSI-RS as a resource or RS type, each resource set s ( s = 0, 1, ..., S -1) may include K _s ≥ 1 resources. In this case, LTE can be recognized as a special case where S = 1. Therefore, when S = 1, the UE can be configured with K ≥ 1 CSI-RS resources. When using S > 1 CSI-RS sets, different resource sets may or may not overlap with each other. When this characteristic is used for resource sharing across multiple UEs or TRPs, overlap between the two sets (i.e., at least one of the CSI-RS resources in the first set is the same as that in the second set) may occur.

In NR, configuring the UE using S > 1 CSI-RS resource sets can be used for various purposes. An example use case is for CSI-RS resource aggregation, whether for the UE to receive transmissions from multiple TRPs or to form CSI-RS resources using a large number of ports. . In such cases, integration across multiple CSI-RS resource sets may be performed semi-statically or dynamically.

Another example use case is for beam management, where a large number of beams (one beam may be associated with one CSI-RS resource or a set of ports, or a combination of the two) are grouped into S groups. It can be. Here, each beam group may correspond to one set. One beam consumes one CSI-RS resource (e.g. N _k For ports), beam management may be performed across S sets or beam groups. For example, beam reporting and measurements may correspond to aggregate or beam group quality (group-RSRP or group-CQI, etc. with associated group or aggregate index). Optionally, each set or beam group may be implemented as a coarse beam with an associated coarse beam index (or alternatively a level-1 or coarse CSI-RS resource index). In this case, a correspondence relationship between each set s (or a beam group consisting of K _s beams or CSI-RS resources) and the coarse beam or CSI-RS resource index may be defined or established. In this case, there are two levels of beams or resources. Within each of the S sets, if the UE is assigned a beam group of set s, more sophisticated beam management (e.g., K _s Beam reporting or measurement across more sophisticated beams/resources) can be performed. Alternatively, instead of performing beam management within such a set s, CSI acquisition across K _s CSI-RS resources may be performed based on the CSI-RS Resource Index (CRI), CQI, PMI, and/or RI. You can.

When the total number of beams (or CSI-RS resources) K is large (for >6 GHz, K may be >100), configuring the UE into S CSI-RS resource sets (or beam groups) Signaling support for and reporting/measurement within each resource set can be designed at at least two levels. This is to avoid excessive signaling overhead (DL and/or UL) while providing sufficient flexibility.

In another example use case, the UE is configured with S >1 CSI-RS resource sets, where at least one of the S CSI-RS resource sets is used for CSI acquisition, and the S CSI-RS resource sets At least the other one is used for beam management. In the special case of S=2, one CSI-RS resource set (with K ₀ >1 resources) can be established via CSI reporting (via CRI, RI, PMI, and/or CQI, etc.) , another CSI-RS resource set (with K ₁ >1 resources) can be configured through beam management reporting (beam-RSRP and/or CRI, etc.).

In one embodiment (Embodiment I.I), the UE is first configured with a total of K CSI-RS resources through upper layer (e.g., RRC) signaling. The value of K can be large so that upper layer/RRC resets are minimized. Likewise, when having a large K, upper layer settings are used to avoid dynamic signaling of the DCI field of at least 7 bits (per CC) for resource selection.

In addition to configuring the UE with K CSI-RS resources, the UE may also be configured with S (≥1) CSI-RS resource sets or groups, where the K CSI-RS resources are grouped into S sets. It can be. Grouping K CSI-S resources into S resource sets/groups can be described as follows. Denote as the ith CSI-RS resource set and is denoted as the kth resource. Then, given that at least two sets may have overlapping resources, such a resource grouping can be expressed as:

(Equation 1)

At least the following options may be used in one or more embodiments. First, S sets are also established through upper layer/RRC signaling. Second, the S sets are set dynamically (eg, through L1/L2 DL control signaling). Third, S sets are established through a combination of upper layer/RRC and L1/L2 DL control signaling. Overall, the benefit of resource pooling or sharing is reduced through higher layer (implying higher latency) signaling at the expense of dynamic signaling overhead. For dynamic signaling, L1 or L2 (MAC CE) signaling (via DCI used for DL/UL allocation) can be used.

When used with aperiodic CSI-RS (AP-CSI-RS), DCI-based CSI-RS resource selection provides the UE with the AP-CSI transmitted (either in the same slot/subframe as the DCI or in a later slot/subframe in the DCI). -Can be used to indicate a small subset of CSI-RS resources associated with an RS (including the possibility of only one CSI-RS resource). In this disclosure, this step is called Dynamic 2. Prior to this DCI-based CSI-RS resource selection step, intermediate dynamic signaling may also be used to select a larger subset from the K upper layer configured CSI-RS resources. In this disclosure, this step is called Dynamic 1. For Dynamic 1, MAC CE or CDI based signaling can be used. MAC incurs higher latency than DCI but is more reliable. In addition to CSI-RS resource selection, Dynamic 1 and/or Dynamic 2 may be used for CSI-RS resource set selection.

Dynamic 1 can be used without any conditions when setting up the UE or can be used only when at least one condition is satisfied. In one way (Condition 1), the conditions are the values of K and/or N, or the values of S and/or M. In another way (condition 2), if S >1 is set, one condition is the value of N _S and/or K _S. In another way (condition 3), a combination of the two previously mentioned examples can be used. For example, a specific condition based on method (condition) 1 can be described as follows. If K > X (the value of X is settable or fixed), dynamic 1 is used. Otherwise (if K ≤ X ), dynamic 1 is omitted. Other specific conditions based on method (condition) 1 can be stated as follows. If S > Y (the value of Y is settable or fixed), dynamic 1 is used. Otherwise (if S ≤ Y ), dynamic 1 is omitted. If both K and S are set via higher layer signaling (scheme B.1, C.1, C.2, or C.3 in Table 1 below), conditions based on both K and S; For example , K > Otherwise (if K ≤ X and S ≤ Y ), dynamic 1 is omitted. The value of the threshold ( X and/or Y ) can be derived from the number of bits of the DCI field used for selection in Dynamic 2.

When used without any conditions, dynamic 1 exists for any value(s) of K and/or N , and S and/or M.

Table 1 lists several exemplary schemes (schemes) of Example I. Scheme A is based on CSI-RS resource selection, while Schemes B.1 and B.2 are based on CSI-RS resource set selection. For scheme B.1, the upper layer configuration may include configuration for S CSI-RS resource sets, along with CSI-RS resource(s) for each of the S sets. It may or may not include an explicit setting of the K value. In this approach (B.1), subset selection (Dynamic 1, if used) and resource selection (Dynamic 2) are performed at the level of the resource set rather than the resource. In methods C.1, C.2, and C.3, a subset of resources within at least one resource set is selected. For CSI-RS resource selection purposes, one CSI-RS resource corresponds to one CSI-RS resource index. Likewise, for CSI-RS resource set selection purposes, one CSI-RS resource set corresponds to one CSI-RS resource set index. In methods C.1, C.2, or C.3, subset selection (Dynamic 1, if used) and resource selection (Dynamic 2) are performed at the resource level.

[Table 1]

In this embodiment, several example signaling formats may be used in one or more embodiments for Dynamic 1 (resource or resource set selection/activation).

In the first option (Opt 1), a bitmap-based method is used. For example, in scheme A, a bitmap of size K is 1 in the nth component when the nth resource is activated/selected, and 0 otherwise. One bitmap can be used per component carrier (CC). Here, the value of N can be signaled implicitly in the bitmap (through the number of components with a value of 1) or set through higher layer signaling. For scheme B.1, the bitmap of size S is 1 in the nth component when the nth resource set is activated/selected, and 0 otherwise. One bitmap can be used per component carrier (CC). Here, the value of M can be signaled implicitly in the bitmap (through the number of components with a value of 1) or set through higher layer signaling. In scheme C.1, a bitmap of size K _S for the sth set is 1 in the nth component when the nth resource is activated/selected, and 0 otherwise. can be used (s=0 , 1, ..., S-1).

In the second option (Opt 2), a codeword-based method is used where each code point in the codeword represents a selection hypothesis. For example, in scheme A, with one field per component carrier (CC) Bit fields may be used. The value of N _S can be signaled as part of Dynamic 1 or signaled separately through RRC (higher layer) signaling. For scheme B.1, with one field per component carrier (CC) Bit fields may be used. The value of N _S can be signaled as part of Dynamic 1 or signaled separately through RRC (higher layer) signaling. In method C.1, for the s( s =0,1,…, S -1)th set Bit fields may be used.

As previously mentioned, two sub-embodiments may be used in one or more embodiments: MAC CE or DCI may be used for Dynamic 1.

In one sub-embodiment where MAC CE is used, one unit of signaling includes one octet (set of 8 bits), where one octet may include one bitmap or one codeword. If multiple octets are needed, the octets can be aggregated into a single bitmap or codeword. An exemplary procedure is as follows. First, the UE performs reception through PDSCH in slot n. Afterwards, when the UE successfully decodes the MAC CE message, it selects/activates slot n+D. The value of D may be the same or different from that used for PDCCH. As an example, in Scheme A, if a bitmap of size K is used, N may be implicitly signaled through the bitmap (and may be set dynamically accordingly). The DCI payload of Dynamic 2 can then change dynamically (in response to MAC CE) or semi-statically (fixed to the maximum value of N). If the UE is configured with multiple component carriers or cells, one MAC CE signaling unit may be associated with one component carrier or one cell. Optionally, one MAC CE signaling unit may be used (jointly) for the total number of CSI-RS resources across all component carriers or cells. Similarly, for scheme B.1, if a bitmap of size S is used, M can be implicitly signaled through the bitmap (and thus set dynamically). The DCI payload of Dynamic 2 can then change dynamically (in response to MAC CE) or semi-statically (fixed to the maximum value of M). If the UE is configured with multiple component carriers or cells, one MAC CE signaling unit may be associated with one component carrier or one cell. Optionally, one MAC CE signaling unit may be used (jointly) for the total number of CSI-RS resource sets across all component carriers or cells.

If Dynamic 1 is used without any conditions, there will be MAC CE signaling. For example, when the bitmap method is used, there is a bitmap of size K or size S, and each of the elements of the bitmap is 1 (i.e., all resources or sets of resources are selected).

In another sub-embodiment when DCI is used, at least two example schemes may be used. In the following embodiments, method A of Table 1 (selecting N out of K configuration resources) is assumed. From Table 1 and the description below, those familiar with the field can infer extensions to other methods.

In the first example (Alt1), CSI-RS resource or resource set selection (activation-deactivation) is done by activating N CSI-RS resources at a time. To activate N CSI-RS resources, one-time use of DCI is required. As described above, the value of N can be set through the upper layer (RRC) or dynamic signaling. N selected resources are deactivated when another DCI is received. This example may be illustrated in diagram 500 of FIG. 5 where N = 2 for illustrative purposes. When the first DCI is received (501), 2 resources out of K are selected or activated. Upon receipt of a second DCI 502 in which two possibly different resources are selected or activated, different resource(s) than those indicated in the most recent DCI are released or deselected. Likewise, upon receipt of a third DCI 503 in which two possibly different resources are selected or activated, different resource(s) than those indicated in the most recent DCI are released or deselected. This DCI may include a field representing N selections among K resources - a bitmap or codeword as described above.

In the second example (Alt2), CSI-RS resource or resource set selection (activation-deactivation) is done by activating one CSI-RS resource at a time. To activate a total of N CSI-RS resources, up to N consecutive DCI uses are required. Accordingly, in a given slot, the number of activated/selected CSI-RS resources can be changed. Another DCI can be used to deselect or deactivate one CSI-RS resource. This example can be illustrated in diagram 550 of FIG. 5 . When a first selection or activation DCI is received (551), one resource out of the K is selected or activated, followed by a second selection or activation DCI (552) in which another different resource is selected or activated. Depending on reception of 552, two CSI-RS resources are selected or activated. When the first deselect or deactivate DCI is received (553), one of the previously activated or selected resources is deactivated or deselected. Upon receipt of 553, only one CSI-RS resource is selected or activated. When the third selection or activation DCI is received (554), another resource among the K is selected or activated. Depending on reception of 554, a total of two CSI-RS resources are selected or activated. When a second deselect or deactivate DCI is received (555), one of the previously activated or selected resources is deactivated or deselected. Upon receipt of 555, only one CSI-RS resource is selected or activated. In addition to the field representing one of the K configured CSI-RS resources, a 1-bit field (indicating whether the DCI selects or deselects the CSI-RS resource) is used to distinguish a selected or activated DCI from a deselected or deactivated DCI. It can be. In contrast, when the UE receives a CSI-RS resource indication field and decodes the value Therefore, the 1-bit field is not needed. Similarly, when the UE receives a CSI-RS resource indication field and decodes the value there is.

As a variation of the second example, CSI-RS resource or resource set selection (activation-deactivation) is done by activating x >1 CSI-RS resources at a time. To activate a total of N CSI-RS resources, up to Continuous use of DCI is required for meetings.

In any slot/subframe, the UE selects a CSI-RS resource from N' CSI-RS resources selected or activated through an A-CSI request and Dynamic 1 signaling (Alt1 as the first example or Alt2 as the second example). Dynamic 2 DCI including an indication of can be received. When the first example, Alt1, is used, N ' = N. When the second example, Alt2, is used, N ' is the cumulative number of activated CSI-RS resources as shown in FIG. 6. The indication may be signaled in the form of an n-bit DCI field, where n is a total of 2 ⁿ states (or hypotheses or codepoints) for selecting a CSI-RS resource and/or CSI-RS resource sets. ) is allowed. For example, in scheme B.1, the number of states 2 ⁿ is the number of possible choice combinations is equal to or greater than that. For M' = 1, the number of states 2 ⁿ is equal to or greater than M. With regard to embodiments (sub-embodiments) in which dynamic 1 is conditionally used, the relevant threshold values (X and/or Y) may be derived from the number 2 ⁿ of states of DCI signaling, or equivalent thereto. . That is, if the total number of CSI-RS resources or resource sets is greater than 2 ⁿ , the number of states of DCI signaling, dynamic 1 is used. In other cases, dynamic 1 can be omitted (or optionally, all elements of the bitmap are set to 1 - if such a bitmap approach is used).

The number of states of DCI signaling (2 ⁿ or n itself) can be set semi-fixingly (for the UE) through higher layer (RRC, etc.) signaling.

Overall, compared to Alt1, Alt2 enables finer granularity (and efficiency) at the expense of total DL control overhead and latency (activating N resources).

In this sub-embodiment (DCI-based solution), the DCI used for Dynamic 1 can be either DL-related or UL-related DCI (related to DL allocation or UL allocation, respectively). Alternatively, the DCI may have a special format (not the format used for grants/allocations). To increase the reliability of this DCI, the UE can report ACK/NAK upon receipt of the DCI (this is natural when DCI is used for DL allocation, for example, but can also be used for special formats of DCI). With respect to its position in the PDCCH (or DL L1 control channel in general) search space, it can be either the general search space (which must be searched by connected UEs every slot/subframe) or the UE-specific search space (related to the UE identification format). Therefore, it must be searched by one UE).

To ensure efficient use of the DL L1 control channel (PDCCH, etc.), UE group DCI may be used for that purpose, where multiple UEs may share the same CSI-RS resource or resource set selection. UE group DCI can be masked using the UE group identifier (UE group RNTI, etc.) assigned to UEs when they are RRC connected. The UE does not recognize whether the assigned RNTI is unique to the UE or to a UE group. Optionally, additional indicators for the RNTI type may be used to distinguish this UE group RNTI from other types of RNTI. Additionally, the UE group RNTI used for CSI-RS resource or resource set selection may be further distinguished from other types of UE group RNTI. This is helpful when the UE is expected to perform at least one other procedure when receiving and decoding the UE group RNTI. Additionally, if ACK/NACK is also used for dynamic 1 DCI, the UE is expected to report ACK/NAK to the network/gNB/TRP when detecting a DCI with an assigned UE group RNTI. By reporting ACK/NAK, the network/gNB/TRP can retransmit the DCI if most (but not all) UEs fail to decode the DCI. Alternatively, the network/gNB/TRP assumes that a UE that failed to decode the DCI (via NAK response or absence of response/DTX) has previously (most recently) decoded the DCI containing the CSI-RS resource or resource set indication. It can be assumed that it does.

In the second component (i.e., CSI-RS resource allocation in the case of multiple component carriers), the term component carrier (CC) refers to multiple component carriers (CCs), multiple cells, or multiple cells during carrier aggregation. It is used to represent various concepts related to the use of multiple radio resources or units, such as multiple transmit/receive points (TRPs) and/or possibly multiple antenna array panels. In this second component, more detailed embodiments for the case of multiple CCs or cells are given.

When a UE is configured to receive transmissions from multiple component carriers (CCs) or multiple cells, as in the case of carrier aggregation (CA) and/or CoMP, a CSI-RS resource or set of resources for each of the CCs The selection is made. To avoid excessive DL signaling overhead (especially related to Dynamic 2 described in Component 1 above), when configured using aperiodic CSI (A-CSI) with AP-CSI-RS, LTE supports multiple CCs. To support this, an RRC-based method is used. For CSI-RS resource selection (for LTE, S=1) when there are N _CC component carriers The bit DCI field is used with the RRC established association between the nth hypothesis (for the nth CC) and the selected CSI-RS resource (one of the N activated via MAC CE). One drawback of this method is that an RRC reset is required to change the selected CSI-RS resource. However, in NR, RRC reconfiguration should be minimized. Additionally, such RRC reset (i.e., coupling between DCI hypothesis and selected resources) surpasses the purpose of MAC CE-based resource selection, since RRC reset causes much longer latency than MAC CE signaling.

The number N _CC of component carriers for Dl or UL can be set through upper layer (RRC) signaling or MAC CE.

In one embodiment of the present disclosure, instead of RRC or higher layer signaling, dynamic signaling is used to generate DCI field hypotheses (code points) of dynamic 2 DCI and selected CSI-RS resources or resources for each of the N _CC configured component carriers. Let's establish relationships between sets. This DCI field is used to request A-CSI reporting and, if applicable, to select one CSI-RS resource among a small number of CSI-RS resources. In the following example methods and sub-embodiments, it is assumed that N CSI-RS resources are selected from K upper layer configuration CSI-RS resources using Dynamic 1 (Scheme A of Component 1 in Table 1). do. Those skilled in the art can deduce extensions to other methods in Table 1 (such as method B.1 in which M are selected from S CSI-RS resource sets). Additionally, those skilled in the art can also deduce expansion to scenarios in which the number K of CSI-RS resources or the number S of resource sets may be different for each CC.

In one sub-embodiment (scheme Ii.1.1), for any given UE, for each CC, when an A-CSI report is requested (triggered) via the UL-related DCI, K > 1 upper layer established CSI-RS Which of the resources (or Scheme B. 1 in Table 1, S > 1 CSI-RS resource sets) is selected is set and indicated to the UE (by the network/gNB/TRP). In these instructions, per CC A bit indicator may be used for each UE. This relationship is established for the UE as part of Dynamic 1 signaling (or similar).

This relationship method is used with the Dynamic 2 mechanism. In particular, it specifies the presence of UL-related DCIs for A-CSI requests to indicate the presence of an AP-CSI-RS for each CC. Can be used (in the same DL slot/subframe as AP-CSI-RS transmission) with the bit DCI field.

In another sub-embodiment (scheme II.1.2), for any given UE, for each CC, when an A-CSI report is requested (triggered) via the UL-related DCI, K > 1 upper layer established CSI-RS Which N>1 of the resources (or Scheme B.1 in Table 1, S >1 CSI-RS resource sets) is selected is set and indicated to the UE (by the network/gNB/TRP). In these instructions, per CC A bit indicator may be used for each UE. This relationship is established for the UE as part of Dynamic 1 signaling (or similar).

This relationship method is used with the Dynamic 2 mechanism. In particular, it uses the UL-related DCI for A-CSI requests to select one of the N CSI-RS resources for each CC. Can be used (in the same DL slot/subframe as AP-CSI-RS transmission) with the bit DCI field.

As described above, any one of the sub-embodiments described above may require one hypothesis (code point) in the DCI field used to request A-CSI reporting and possibly one CSI-RS of a small number of CSI-RS resources. Establishes a relationship between selecting a resource or optionally selecting one CSI-RS resource set from a small number of CSI-RS resource sets. In scheme II.1.1, the relationship information is N _CC It includes bit indicators, where the nth indicator ( n = 0,1, ..., N _CC -1) determines which one of the K upper layer configuration CSI-RS resources is selected for the nth CC. Dynamic 2 DCI When A-CSI reporting is requested or triggered using the nth code point of the bit DCI field, the UE reports A-CSI for the nth CC based on the CSI-RS resource selected as the reference resource for the nth CC. do. In scheme II.1.2, the relationship information is N _CC Contains bit indicators, where the nth indicator ( n =0, …, ) determines which N of the K upper layer configuration CSI-RS resources are selected for the nth CC. Dynamic 2 DCI When an A-CSI report is requested or triggered using the mth code point of the bit DCI field ( m =0, 1,…, NN _CC -1), the UE Based on the CSI-RS resource selected as the reference resource for the second CC Report A-CSI for the th CC.

The above two sub-embodiments (schemes II.1.1 and Ii.1.2) can be used together depending on the set number N _CC of component carriers. Additionally, the value of N is set such that the resulting DCI payload for Dynamic 2 is not excessive (or equal, i.e., while allowing some flexibility in CSI-RS resource selection). can be varied depending on N _CC (so that remains the same).

Therefore, in a variant of scheme II.1.2, the value of N is specified (fixed) for a given value of N _CC . in other words,

(Equation 2)

here ego am. A special case is when P=2. In this case, when N _CC is less than a certain value is used. In other cases, N=1 is used. Equation 2 or the special case of P=2 for that, e.g. and is selected, You can ensure that does not exceed any given value. Optionally, and Is can be chosen to remain the same for different values of N _CC . Optionally, and Can be set through upper layer (RRC) signaling.

As mentioned above, Schemes II.1.1 and II.1.2 are explained assuming Scheme A in Table 1. In scheme B.1 of Table 1, K and N can be replaced by S and M, respectively.

This dynamic signaling can be performed via DCI (and therefore DL L1 control channel) or MAC CE.

In one sub-embodiment (scheme Ii.2.1), a DCI-based scheme is used, with a special DCI format used only for this purpose without data DL/UL allocation. These DCIs may be UE-specific or UE group-specific (a DCI contains a CSI-RS resource or resource set selection configuration for a group of UEs). If a DCI specific to a multi-function UE group is used, this DCI has a 'function indicator' with one hypothesis (code point) indicating (among other functions of the DCI specific to this UE group) 'CSI-RS resource selection/reconfiguration'. Can contain fields.

In another sub-embodiment (Scheme Ii.2.2), a MAC CE based scheme is used, in which one or more octets are allocated to each CC per UE. In this case, one MAC CE is allocated to each of N _CC CCs. As an option, one MAC CE can be used for all N _CC Ccs. Since MAC CE is used for various purposes, a 'function indicator' field similar to LTE LCID can be used to indicate the function of MAC CE.

When a UE is configured with A-CSI reporting and AP-CSI-RS with multiple CSI-RS resources or resource sets, the UE procedure for A-CSI reporting can be described as follows. First, the UE receives a Dynamic 1 Activation message (via DCI or MAC CE) in slot/subframe n. Then, following a successful decoding attempt, the UE starts from slot/subframe n + D ₁ when the UE receives a deactivation message (related to a previous activation) or another activation message in the next slot/subframe n + D ₂ Take the CSI-RS resource or resource set settings. Between slots/subframes n + D ₁ and n + D ₂ , whenever the UE receives a UL-related DCI containing an A-CSI request (corresponding to Dynamic 2 operation), the UE receives the CSI-RS resource or resource Interprets the CSI request DCI field according to the set settings.

The UE is configured with a CSI measurement setting with L>1 links (each of the L links combines one CSI reporting setting with one resource setting) and at least two of the L links When responding to CSI reporting settings established through A-CSI reporting and resource settings established with AP-CSI-RS, Dynamic 1 (MAC CE or DCI) or Dynamic 2 (CSI-RS resource or resource set selection may be included) Signaling for a DCI (DCI) used in an A-CSI request may include a "link indicator" indicating which of the L links is involved in the signaling. For DCI-based signaling, this “link indicator” may be part of the CSI request field or separate from it. The size of the “link indicator” field depends on the higher-layer configured L value. This indicator may also be signaled jointly with at least one of the CSI request field and the CSI-RS resource or resource set selection indicator.

6 illustrates the use of Dynamic 1 and Dynamic 2 when a UE is configured with A-CSI reporting and AP-CSI-RS according to some embodiments and sub-embodiments of the present disclosure. Figure 600 shows an example operation with N _CC =1 CC (using M '=1 for illustrative purposes), and drawing 610 shows an example operation with N _CC >1 CC. . In both examples, scheme B.1 of Table 1 is taken.

When the UE is configured with multiple component carriers ( N _CC >1) and each component carrier is associated with multiple CSI-RS resource sets (where the number of CSI-RS resource sets is (may be the same or different across), CSI reporting for each of the N _CC component carriers is associated with at least one CSI reporting setting. This reporting setting may be linked to one or multiple resource settings, where each resource setting may include one or multiple CSI-RS resource sets. In this scenario, several sub-embodiments (i.e., variations of figure 610) may be used in one or more embodiments.

In one sub-embodiment (scheme II.3.1), the upper layer (e.g. RRC) configuration includes multiple CSI reporting configurations, where each CSI reporting configuration may be associated with one component carrier and its CSI reporting configuration. A configuration is linked to a single resource configuration or multiple resource configurations. U.E. It is further established with a set of states, where each state corresponds to one CSI reporting setting. When a CSI reporting setting is linked with multiple resource settings, multiple states may correspond to the same CSI reporting setting, but multiple resource settings. In this way, CSI-RS resource or resource set selection can be performed through “state” selection by linking a resource configuration containing a subset of CSI-RS resources or resource sets to a CSI reporting configuration. Subsets of CSI-RS resources or resource sets may be derived from a subset or all of the CSI-RS resources or resource sets included in the resource configuration. Whether a subset or all of a CSI-RS resource or set of resources is included in that "state" is established and can be transmitted to the UE semi-statically (via upper layer or RRC signaling) or dynamically (via MAC CE or DCI). It can be indicated as: Since, for such a given “state”, one CSI reporting setting may be linked to more than one resource setting, a resource (or set of resources) indication may be used for each of the resource settings linked to the CSI reporting setting. That is, if the CSI reporting setting for this specific state j is linked to M _j resource settings, M _j subset instructions can be used. Each of the subset indications may be a bitmap with a size corresponding to the number of CSI-RS resources or resource sets included in the corresponding resource configuration. If only one CSI resource or set of resources is selected, A bit indicator ( NumResource is the number of resources or resource sets included in the resource configuration) can be used.

Accordingly, in this subembodiment a “state” j may correspond to (and may contain a reference to) a CSI reporting setting, and one or more resource settings are linked to that CSI reporting setting.

Optionally, the “state” j may correspond to a CSI reporting configuration, as long as one or more resource configurations are linked, and a CSI-RS resource (or CSI-RS resource set) subset selection indicator for each of the resource configuration(s) ( may contain references thereto). Optionally, the resource settings and the indication for CSI-RS resource (or CSI-RS resource set) subset selection for each of the resource settings may be combined in one indicator. Optionally, additional indicators may be added combining CSI reporting settings with component carrier (CC).

The “state” setting may be performed semi-statically, and therefore as part of higher layer (e.g., RRC) signaling for aperiodic CSI reporting. Optionally, this “triggering state” setting can also be signaled via MAC CE for faster updates.

Additionally, many different CSI reporting settings can be combined with various component carriers. Accordingly, triggering various CSI reporting settings (via triggering of various states) may result in triggering of various component carriers.

Similar to the previous embodiments, dynamic 1 can be used as follows. number of states is the threshold If it is greater than Dynamic 1 is used. from Narrow down the number of states and make your selection. For this purpose, bit bitmap (similar to method II.1.1 above) or Bit indicators (similar to Scheme 1.2 above) can be used to signal a subset of selected states via DCI (similar to Scheme II.2.1 above) or MAC CE (similar to Scheme II.2.2 above). number of states is the threshold If less than or equal to Dynamic 1 is not used. threshold Can be fixed or set to a higher layer (eg, RRC). threshold may correspond to the number of code points that can be accommodated by the DCI field used in the A-CSI request of Dynamic 2, One of the states is triggered. One additional hypothesis for "No A-CSI request" may be needed, thereby It should be noted that this leads to a total number of code points. By triggering one of the states, the CSI reporting configuration corresponding to the selection of the CSI-RS resource or resource set (and one component carrier if the UE is configured with multiple component carriers) is selected or triggered.

This sub-embodiment in which triggering one of the states is combined with triggering one of the CSI reporting settings can be shown in diagram 700 of FIG. 7 .

In another sub-embodiment (scheme II.3.2), the upper layer (e.g. RRC) setting includes multiple CSI reporting settings, where each CSI reporting setting may be associated with one component carrier and its CSI reporting setting. is linked to one resource setting or multiple resource settings. U.E. It is further established with a set of states, where each state corresponds to at least one CSI reporting configuration. When a CSI reporting setting is linked with multiple resource settings, multiple states may correspond to the same CSI reporting setting, but multiple resource settings. In this way, CSI-RS resource or resource set selection can be performed through “state” selection by linking a resource configuration containing a subset of CSI-RS resources or resource sets to a CSI reporting configuration. Subsets of CSI-RS resources or resource sets may be derived from a subset or all of the CSI-RS resources or resource sets included in the resource configuration. Whether a subset or all of a CSI-RS resource or set of resources is included in that "state" is established and can be transmitted to the UE semi-statically (via upper layer or RRC signaling) or dynamically (via MAC CE or DCI). It can be indicated as: Since, for such a given “state”, each of the CSI reporting settings may be linked to more than one resource setting, a resource (or set of resources) indication may be used for each of the resource settings linked to the CSI reporting setting. That is, if the CSI reporting setting for this specific state j is linked to M _j resource settings, M _j subset instructions can be used. Each of the subset indications may be a bitmap with a size corresponding to the number of CSI-RS resources or resource sets included in the corresponding resource configuration. If only one CSI resource or set of resources is selected, A bit indicator ( NumResource is the number of resources or resource sets included in the resource configuration) can be used.

Accordingly, in this sub-embodiment a “state” j may correspond to (and may contain references to) one or more CSI reporting settings, and one or more resource settings are linked to each of the CSI reporting setting(s).

Optionally, the "state" j is one or more CSI reporting settings to which one or more resource settings are linked, and a CSI-RS resource (or CSI-RS resource set) subset selection indicator for each of the resource setting(s). may correspond to (may contain references to). Optionally, the resource settings and the indication for CSI-RS resource (or CSI-RS resource set) subset selection for each of the resource settings may be combined in one indicator. Optionally, additional indicators may be added combining CSI reporting settings with component carrier (CC).

The “state” setting may be performed semi-statically, and therefore as part of higher layer (e.g., RRC) signaling for aperiodic CSI reporting. Optionally, this “triggering state” setting can also be signaled via MAC CE for faster updates.

Additionally, many different CSI reporting settings can be combined with various component carriers. Accordingly, triggering various CSI reporting settings (via triggering of various states) may result in triggering of various component carriers.

Similar to the previous embodiments, dynamic 1 can be used as follows. number of states is the threshold If it is greater than Dynamic 1 is used. from Narrow down the number of states and make your selection. For this purpose, bit bitmap (similar to method II.1.1 above) or Bit indicators (similar to Scheme II.1.2 above) can be used to signal a subset of selected states via DCI (similar to Scheme II.2.1 above) or MAC CE (similar to Scheme II.2.2 above). number of states is the threshold If less than or equal to Dynamic 1 is not used. threshold Can be fixed or set to a higher layer (eg, RRC). threshold may correspond to the number of code points that can be accommodated by the DCI field used in the A-CSI request of Dynamic 2, One of the states is triggered. One additional hypothesis for "No A-CSI request" may be needed, thereby It should be noted that this leads to a total number of code points. By triggering one of the conditions, at least one CSI reporting configuration corresponding to the selection of a CSI-RS resource or set of resources (and one component carrier if the UE is configured with multiple component carriers) is selected or triggered.

This sub-embodiment in which triggering one of the states is combined with triggering one of the CSI reporting settings can be shown in diagram 800 of FIG. 8A. It should be noted that the number of CSI reporting settings for various states may vary.

In another sub-embodiment (scheme II.3.3), the upper layer (e.g. RRC) setting includes multiple CSI reporting settings, where each CSI reporting setting may be associated with one component carrier and its CSI reporting setting. is linked with one or multiple CSI-RS resources or resource sets. Each of the CSI-RS resources or resource sets may be referenced through a resource ID or resource set ID. This ID includes at least one other characteristic, such as power level (including zero power or non-zero power), a time domain characteristic (e.g., whether the resource is periodic, semi-persistent, or aperiodic), and whether the resource is periodic or semi-persistent. , slot offset and periodicity may also be included), and/or frequency domain characteristics. U.E. It is further established with a set of states, where each state corresponds to at least one CSI reporting configuration. In this way, CSI-RS resource or resource set selection can be performed through “state” selection, where a state is associated with a subset of CSI-RS resources or resource sets. These CSI-RS resources or resource sets may be taken from a pool of CSI-RS resources or resource sets. The pool may be common to all UEs, or may be unique to the UE (so, for example, it may be established through higher layer signaling, where one pool is a pool that the UE can use for various purposes). includes all CSI-RS resources). Accordingly, subsets of CSI-RS resources or resource sets may be derived from a subset or all of the CSI-RS resources or resource sets in the pool. Whether a subset or all of a CSI-RS resource or set of resources is included in that "state" is established and can be transmitted to the UE semi-statically (via upper layer or RRC signaling) or dynamically (via MAC CE or DCI). It can be indicated as: Each of the CSI-RS resources or resource sets linked to the CSI reporting configuration may be used for channel or interference measurements. This may be indicated for each of the CSI-RS resources or resource sets. When used for interference measurements, CSI-RS resources can be zero or non-zero power.

Accordingly, in this sub-embodiment a “state” j may correspond to (and may include a reference to) one or more CSI reporting settings, and one or more CSI-RS resources or sets of resources may be associated with each of the CSI reporting setting(s). It is linked to

The “state” setting may be performed semi-statically, and therefore as part of higher layer (e.g., RRC) signaling for aperiodic CSI reporting. Optionally, this “triggering state” setting can also be signaled via MAC CE for faster updates.

Additionally, many different CSI reporting settings can be combined with various component carriers. Accordingly, triggering various CSI reporting settings (via triggering of various states) may result in triggering of various component carriers.

Similar to the previous embodiments, dynamic 1 can be used as follows. number of states is the threshold If it is greater than Dynamic 1 is used. from Narrow down the number of states and make your selection. For this purpose, bit bitmap (similar to method 1.1 above) or Bit indicators (similar to Scheme 1.2 above) can be used to signal a subset of selected states via DCI (similar to Scheme 2.1 above) or MAC CE (similar to Scheme 2.2 above). number of states is the threshold If less than or equal to Dynamic 1 is not used. threshold Can be fixed or set to a higher layer (eg, RRC). threshold may correspond to the number of code points that can be accommodated by the DCI field used in the A-CSI request of Dynamic 2, One of the states is triggered. One additional hypothesis for "No A-CSI request" may be needed, thereby It should be noted that this leads to a total number of code points. By triggering one of the conditions, at least one CSI reporting configuration corresponding to the selection of a CSI-RS resource or set of resources (and one component carrier if the UE is configured with multiple component carriers) is selected or triggered.

This sub-embodiment in which triggering one of the states is combined with triggering one of the CSI reporting settings can be shown in diagram 810 of FIG. 8B. It should be noted that the number of CSI reporting settings for various states may vary.

In all the above embodiments and sub-embodiments of the second component (in particular schemes II.3.1, II.3.2 or II.3.3), the coupling between the CSI reporting settings and the resource settings (for state definition purposes) is explicit. It can be indicated as: Here, in one CSI reporting setting, a connection relationship to a certain resource setting may be indicated in relation to a resource setting index/indicator. Resource configuration indexes/indicators related to the CSI reporting configuration may be included in the CSI reporting configuration or may be defined outside the CSI reporting configuration. Optionally, it may be indicated using a link index/indicator. Here, the link index/indicator lists links connecting CSI reporting settings and resource settings.

In the third component (i.e., A-CSI request through DL allocation), in LTE, the A-CSI request is performed through a UL grant using UL-related DCI. When a UE is configured with an AP-CSI-RS associated with A-CSI reporting, the A-CSI is included within the same DL subframe used for UL-related DCI. Accordingly, the CSI Request field is extended to include CSI-RS resource selection and is included within the UL-related DCI. Although this solution is natural (since the UL-related DCI contains the UL resource allocation field used to transmit the A-CSI report), requesting A-CSI reporting only through the UL-related DCI limits the flexibility of A-CSI reporting. do. Additionally, when other means are available at the network/gNB/TRP discretion, the use of a data-less UL grant just to trigger A-CSI reporting may be inefficient.

In one embodiment of this disclosure, A-CSI reporting may be requested via a DL-related DCI (and thus DL allocation) that includes a CSI request field. These DL-related DCIs may be UE-specific or UE-group specific. When the UE is configured with N _CC Ccs, this CSI request field is may contain bits, where the nth hypothesis or code point is the nth CC ( n =0, 1, …, ) responds to CSI requests.

In one sub-embodiment of this embodiment, UL resource allocation (UL RB(s) assigned to A-CSI reporting, etc.) is established through higher layer signaling. Therefore, no additional information is required other than the CSI reporting fields.

In another subembodiment, additional The bit DCI field is used to indicate the selection of P upper layer configuration UL resource allocations. An example of a P value is 4. In this case, a 2-bit DCI field to indicate the UL resource allocation (RA) used for A-CSI reporting may be included in the DL-related DCI used in the CSI request. UL resources may be obtained from PUSCH (UL Shared Channel), PUCCH (UL Control Channel), or both.

In a variation of this sub-embodiment, the CSI request field is extended to include an additional hypothesis to indicate the UL RA used for A-CSI reporting. For example, when a UE is configured with one CC, the 1-bit CSI request field is a total number with one hypothesis (e.g. associated with a value of all zeros) reserved for "no CSI reqUEst". It can be expanded to include hypotheses. As a result, the number of bits in the CSI no request (no CSI reqUEst) field is It can be. One example value of P is 3, which derives a 2-bit extended CSI request field. An example is given in Table 2 below.

[Table 2]

In another sub-embodiment, at least one existing DCI field in the DL-related DCI may be used to indicate the UL RA used for A-CSI reporting when A-CSI reporting is requested. For example, when the UE is configured with one CC and the CSI request field is 1 (meaning A-CSI reporting is requested), at least one existing DCI field is reinterpreted as a UL RA indicator. One example is several DCI fields (MCS, HARQ related fields, and DL resource allocation).

In one sub-embodiment, the DL-related DCI used for DL allocation may only be used for A-CSI reporting requests when DL allocation is performed via the DCI for the UE of interest. That is, when DL-related DCI is received in slot/subframe n, DL transmission on PDSCH for the UE of interest may be received in subframe n+D, where D is fixed or set. In this case, at least two options exist. In a first option, A-CSI may be reported along with HARQ-ACK associated with scheduled/assigned DL transmission on PDSCH. In a second option, A-CSI may be reported separately from the HARQ-ACK associated with the scheduled/assigned DL transmission on the PDSCH. In this second option, an additional DCI field is used to indicate secondary timing, such as the relative timing shift Δ (of slots) between A-CSI reporting and HARQ-ACK, or the slot containing DL-related DCI and A-CSI reporting. It can represent the absolute timing D _CSI between slots used.

Other DL-related DCIs may also be used.

Either of the above embodiments for aperiodic CSI-RS (A-CSI) may also be used for semi-persistent CSI-RS (SP-CSI-RS) or periodic CSI-RS (P-CSI-RS).

Any one of the above modified embodiments may be used independently or in combination with at least one other modified embodiment.

FIG. 9 shows a flow diagram for an example method 900 for a UE to receive and decode CSI reporting and resource configuration information, according to an embodiment of the present disclosure. For example, this method 900 may be performed by UE 116.

The method 900 begins with the UE receiving and decoding (step 901) upper layer configuration information for N channel state information (CSI) reporting settings and M resource settings, where N is at least 1. and M is greater than 1. At least one of the M resource settings includes at least one CSI-RS resource set, and the resource set includes at least one CSI-RS resource. The UE further receives downlink control information (DCI) including a DCI field for requesting aperiodic CSI reporting (step 902), where the DCI field includes a selection of X _STATE configuration states. _{These _ _ _} In this case, at least one of X _STATE and N _STATE is set to the upper layer. At least one of the configured states corresponds to at least one CSI-RS resource set, at least one of the configured states corresponds to at least one downlink component carrier, and at least one of the configured states corresponds to at least one CSI reporting configuration corresponds to The UE calculates CSI according to the configuration information and DCI (step 903) and transmits the calculated CSI on the uplink (UL) channel (step 904).

FIG. 10 shows a flow diagram for an example method 1000 for a BS to generate and transmit CSI reporting and resource configuration information for a UE (labeled UE-k), according to an embodiment of the present disclosure. For example, this method 1000 may be performed by BS 102.

The method 1000 begins with the BS generating (step 1001) upper layer configuration information for N channel state information (CSI) reporting settings and M resource settings, and the UE (named UE-k) (step 1002), where N is at least 1 and M is greater than 1. At least one of the M resource settings includes at least one CSI-RS resource set, and the resource set includes at least one CSI-RS resource. The DCI field contains a selection of one of X _STATE configuration states. _{These _ _ _} In this case, at least one of X _STATE and N _STATE is set to the upper layer. At least one of the configured states corresponds to at least one CSI-RS resource set, at least one of the configured states corresponds to at least one downlink component carrier, and at least one of the configured states corresponds to at least one CSI reporting configuration corresponds to The BS transmits configuration information through the downlink (DL) channel and DCI through the DL control channel to UE-k (step 1003), and transmits configuration information and DCI from UE-k to the uplink (UL) channel according to the configuration information and DCI. The calculated CSI report is received (step 1004).

9 and 10 show examples of a method for receiving configuration information and a method for configuring a UE, respectively, but various changes may be made to FIGS. 9 and 10. For example, although a series of steps are shown, in one or more embodiments the various steps in each figure may overlap, occur side by side, occur in a different order, occur multiple times, or not be performed at all.

Those skilled in the art will recognize that performing all or part of the steps performed by the embodiments of the method described above can be accomplished through commanding the relevant hardware by a program, which, when executed, performs any of the steps of the embodiments of the method described above. stored on a computer-readable storage medium containing one or a combination thereof.

Additionally, operation units of various embodiments of the present application may be merged into a processing module, or each unit may be physically separate, or two or more units may be merged into one module. The merged module may be implemented in the form of hardware or may be implemented in the form of software operation modules. The merged module may also be implemented in the form of a software operational module and stored in a computer-readable storage medium when sold or used as a stand-alone product.

Although the present disclosure has been described in conjunction with exemplary embodiments, various changes and modifications may be suggested by or to those skilled in the art. This disclosure is intended to cover such changes and modifications as fall within the scope of the appended claims.

Claims (16)

In a user equipment (UE), the user equipment:
Ministry of Communications; and
It includes a processor that controls the communication unit,
The processor,
One or more Channel State Information (CSI) reporting settings, one or more CSI resource settings, N _STATE triggering states, and Radio Resource (RRC) regarding the number of bits in the Downlink Control Information (DCI) field for an aperiodic (aperiodic) CSI reporting request. Control) receives configuration information, and the ^number of triggering _states related to the number of code points in the DCI field
If N _STATE is greater than X _STATE , a MAC control element (Media _Access Control Control Element _, MAC CE) indicating up to Receive a DCI including a DCI field for, and identify a triggering state indicated by the DCI field for the aperiodic CSI report request among up to X _STATE selected triggering states;
If N _{STATE is} less than _or equal to identify the condition;
Configured to perform the aperiodic CSI reporting based on the identified triggering state,
Each of the N _STATE triggering states is associated with at least one CSI reporting setting among the one or more CSI reporting settings, and each of the at least one CSI reporting settings is associated with at least one CSI resource setting among the one or more CSI resource settings. , user device.
In claim 1,
The MAC control element includes a bitmap with N _STATE bits,
The bitmap indicates up to X _STATE selected triggering states among the N _STATE triggering states.
delete In claim 1,
The processor,
If all bits in the DCI field for the aperiodic CSI report request are 0, then identify that CSI is not requested.
In claim 1,
The CSI resource setting includes at least one CSI-RS (Channel State Information Reference Signal) resource set,
The CSI-RS resource set includes at least one CSI-RS resource.
delete In claim 1,
Wherein each of the one or more CSI reporting settings is associated with a component carrier.
In the base station, the base station:
Ministry of Communications; and
It includes a processor that controls the communication unit,
The processor,
One or more Channel State Information (CSI) reporting settings, one or more CSI resource settings, N _STATE triggering states, and Radio Resource (RRC) regarding the number of bits in the Downlink Control Information (DCI) field for an aperiodic (aperiodic) CSI reporting request. Control) transmits configuration information to a user equipment (UE), and the ^number of triggering _states related to the number of code points in the DCI field
If N _STATE is greater than X _STATE , a MAC control element (Media _Access Control Control Element _, MAC CE) indicating up to transmitting a DCI including a DCI field for a periodic CSI reporting request to the user device, and the DCI field for an aperiodic CSI reporting request indicates a triggering state among up to X _STATE selected triggering states;
If _{N STATE} is less than _or equal to Indicates the triggering status among;
Configured to receive the aperiodic CSI report from the user device based on the indicated triggering state,
Each of the N _STATE triggering states is associated with at least one CSI reporting setting among the one or more CSI reporting settings, and each of the at least one CSI reporting settings is associated with at least one CSI resource setting among the one or more CSI resource settings. , base station.
In claim 8,
The MAC control element includes a bitmap with N _STATE bits,
The bitmap indicates up to X _STATE selected triggering states among the N _STATE triggering states.
In claim 8,
The CSI resource setting includes at least one CSI-RS (Channel State Information Reference Signal) resource set,
The CSI-RS resource set includes at least one CSI-RS resource.
In claim 8,
When all bits of the DCI field for the aperiodic CSI report request are 0, the base station indicates that CSI is not requested.
In claim 8,
A base station, each of the one or more CSI reporting settings being associated with a component carrier.
In the method performed by the user equipment (UE),
One or more Channel State Information (CSI) reporting settings, one or more CSI resource settings, N _STATE triggering states, and Radio Resource (RRC) regarding the number of bits in the Downlink Control Information (DCI) field for an aperiodic (aperiodic) CSI reporting request. Control) receiving configuration information, the ^number of triggering _states associated with the number of code points in the DCI field
If N _STATE is greater than X _STATE , receiving a MAC control element (Media _Access Control Control Element _, MAC CE) indicating up to Receiving a DCI including a DCI field for a request, identifying a triggering state indicated by the DCI field for the aperiodic CSI report request among up to X _STATE selected triggering states;
If N _{STATE is} less _than or equal to identifying a triggering condition;
Comprising performing the aperiodic CSI reporting based on the identified triggering state,
Each of the N _STATE triggering states is associated with at least one CSI reporting setting among the one or more CSI reporting settings, and each of the at least one CSI reporting settings is associated with at least one CSI resource setting among the one or more CSI resource settings. , method.
In claim 13,
The MAC control element includes a bitmap with N _STATE bits,
The bitmap indicates up to X _STATE selected triggering states among the N _STATE triggering states.
In the method that the base station performs,
One or more Channel State Information (CSI) reporting settings, one or more CSI resource settings, N _STATE triggering states, and Radio Resource (RRC) regarding the number of bits in the Downlink Control Information (DCI) field for an aperiodic (aperiodic) CSI reporting request. Control) transmitting configuration information to a user equipment (UE), the ^number of triggering _states associated with the number of code points in the DCI field
If N _STATE is greater than X _STATE , transmitting to the user device a MAC control element ₍ Media _Access Control Control Element, MAC CE) indicating up to Transmitting a DCI including a DCI field for an aperiodic CSI reporting request to the user device, wherein the DCI field for an aperiodic CSI reporting request indicates a triggering state among up to X _STATE selected triggering states;
If _{N STATE} is less than _or equal to Indicates the triggering state among the states; and
Receiving the aperiodic CSI report from the user device based on the indicated triggering state,
Each of the N _STATE triggering states is associated with at least one CSI reporting setting among the one or more CSI reporting settings, and each of the at least one CSI reporting settings is associated with at least one CSI resource setting among the one or more CSI resource settings. , method.
In claim 15,
The MAC control element includes a bitmap with N _STATE bits,
The bitmap indicates up to X _STATE selected triggering states among the N _STATE triggering states.

Images