Terminal

Abstract

A terminal is provided with: a reception unit that receives a reference signal in a cell formed by a base station; and a control unit that assumes that the reference signal is set for each group in the cell, and that the group is set on the basis of information relating to antenna ports that receive the reference signal.

Description

Technical Field

[0001] This invention relates to a terminal for receiving reference signals. Background Technology

[0002] The 3rd Generation Partnership Project (3GPP) standardized the 5th generation mobile communication system (also known as 5G, New Radio (NR), or Next Generation (NG)) and also standardized the next generation mobile communication system known as Beyond 5G, 5G Evolution, or 6G.

[0003] In the 6G wireless communication systems that follow, we look forward to achieving ultra-high speeds exceeding 5G. High-capacity communication and numerous connections (non-patent document 1). To achieve even the minimum quality assurance required for such requirements, more resources need to be secured.

[0004] Existing technical documents

[0005] Non-patent literature

[0006] Non-patent document 1: NTT Docomo, "Docomo 6G White Paper Version 5.0", [online], November 2022, [searched on September 28, 2023] Internet <URL: https: / / www.docomo.ne.jp / binary / pdf / corporate / technology / whitepaper_6g / DOCOMO_6G_White_PaperJP_20221116.pdf> Summary of the Invention

[0007] In 5G, the reference signal (RS) received by the terminal (UE: User Equipment) from the base station (gNodeB, gNB) for channel demodulation or channel state information (CSI) estimation is defined as UE-specific RS to enable flexible RS mapping and higher-layer transmission based on multiple input multiple output (MIMO).

[0008] Here, in order to treat RS resources (hereinafter also referred to as RS resources) as common resources among UEs, it is considered that RS should be defined as cell-specific RS. Thus, RS resources are shared among UEs, and it is believed that resources available for other channels can be secured.

[0009] However, if RS is designated as a cell-specific RS, it is sent to all UEs within the cell. In this case, since RS resources are configured for UEs with a higher number of antenna ports (hereinafter also referred to as layers or streams), useless RS resources are generated that cannot be used by UEs with a lower number of antenna ports. For example, when RS resources are configured for UEs with four antenna ports, the RS resources for two antenna ports are wasted for UEs with two antenna ports.

[0010] It is believed that such problems arise between UEs within a cell not only due to differences in the number of antenna ports, but also due to differences in information related to the antenna ports (e.g., which antenna port is used, whether MIMO is supported).

[0011] Therefore, the present invention was made in view of such circumstances, and its object is to provide a terminal that can suppress the waste of RS resources even in a cell where terminals with different information related to the antenna port coexist.

[0012] One disclosed embodiment is a terminal comprising: a receiving unit (wireless signal transceiver 210) that receives a reference signal in a cell formed by a base station; and a control unit (control unit 270) that assumes the reference signal is set according to each group within the cell, the control unit assuming the group is set based on information related to the antenna port receiving the reference signal. Attached Figure Description

[0013] Figure 1 This is a general structural diagram of a wireless communication system.

[0014] Figure 2 This is a diagram showing the frequency ranges used in wireless communication systems.

[0015] Figure 3 This is a diagram illustrating an example of the structure of wireless frames, subframes, time slots, and symbols used in a wireless communication system.

[0016] Figure 4 This is the functional block diagram of the terminal.

[0017] Figure 5 This is a functional block diagram of a base station.

[0018] Figure 6 This is a diagram showing an example of the settings for each group within a cell.

[0019] Figure 7 This is a diagram showing an example of the settings for each cell.

[0020] Figure 8 This is a diagram illustrating the relationship between the number of antenna ports of the terminal, the number of ports of the group-specific RS, and the number of ports of the UE-specific RS.

[0021] Figure 9 This is a diagram illustrating an example of the hardware structure of a base station and a terminal.

[0022] Figure 10 This is a diagram showing an example of the structure of a vehicle. Detailed Implementation

[0023] The embodiments are described below with reference to the accompanying drawings. Furthermore, the same or similar reference numerals are used to denote the same function and structure, and their descriptions are omitted where appropriate.

[0024] (1) Structure of wireless communication system

[0025] (1.1) General Structure

[0026] Figure 1 The wireless communication system 10 shown is a wireless communication system that follows a method known as 5G. On the other hand, the wireless communication system 10 can also be a wireless communication system that follows a method known as Beyond 5G, 5G Evolution, or 6G.

[0027] The wireless communication system 10 can support Massive MIMO (Multiple-Input Multiple-Output) which generates a more directional beam BM by controlling wireless signals transmitted from multiple antenna elements, carrier aggregation (CA) which uses multiple component carriers (CC), and dual connectivity (DC) which communicates simultaneously with two base stations.

[0028] like Figure 1As shown, the wireless communication system 10 includes an NG-RAN (Next Generation Radio Access Network) 20, a base station (next generation NodeB, gNB) 100 connected to the NG-RAN 20, and user equipment (UE) 200 that communicates wirelessly with the gNB 100. The NG-RAN 20 is connected to a core network (CN) not shown. NG-RAN 20 and CN can be simply referred to as a "network". Furthermore, the gNB 100 can also be understood as being included in the network. Additionally, the specific structure of the wireless communication system 10, such as the number of gNBs 100 and UEs 200, is not limited to... Figure 1 The example shown.

[0029] Furthermore, the wireless communication system 10 can also support multiple frequency ranges (FRs). That is, such as Figure 2 As shown, the following FRs can be supported.

[0030] FR1: 410MHz~7.125GHz FR2-1: 24.25GHz~52.6GHz FR2-2: Over 52.6GHz ~ 71GHz In FR1, a subcarrier spacing (SCS) of 15, 30, or 60 kHz and a bandwidth (BW) of 5–100 MHz can be used. In FR2-1, an SCS of 60 or 120 kHz (or including 240 kHz) and a BW of 50 MHz–400 MHz can be used.

[0031] In FR2-2, to avoid increasing phase noise, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) or Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM) with a larger SCS can be applied.

[0032] In addition, such as Figure 3 As shown, one time slot in the wireless communication system 10 consists of 14 symbols. While maintaining this structure, a larger (wider) SCS results in a shorter symbol period (and time slot period). Furthermore, the SCS is not limited to... Figure 3The frequency shown can be, for example, 480kHz, 960kHz, etc.

[0033] Furthermore, the number of symbols constituting one time slot does not necessarily have to be 14 symbols; for example, it could be 28 or 56 symbols. Additionally, the number of time slots per subframe can vary depending on the SCS.

[0034] (2) Functional block structure of wireless communication system

[0035] (2.1) Functional block structure of the terminal

[0036] like Figure 4 As shown, the UE200 includes a wireless signal transceiver unit 210, an amplifier unit 220, a modem unit 230, a control signal / reference signal processing unit 240, an encoding / decoding unit 250, a data transceiver unit 260, and a control unit 270.

[0037] The wireless signal transceiver unit 210 transmits and receives wireless signals with the gNB 100. The wireless signal transceiver unit 210 can be configured as a transmitting unit that sends wireless signals to the gNB 100 and a receiving unit that receives wireless signals from the gNB 100.

[0038] The wireless transceiver unit 210 of the embodiment receives a reference signal (RS) from gNB100 within the cell formed by gNB100. The RS may include, for example, a demodulation reference signal (DMRS) for channel demodulation and a CSI-RS for channel state information (CSI) estimation. The channel may be a control channel or a data channel. The reference signal and channel are not limited to these and may also be signals described later.

[0039] The wireless transceiver unit 210 of the embodiment can receive multiple RSs. For example, it can receive RSs in the Xth and Yth symbols of a series of consecutive symbols. Furthermore, when the RS is a DMRS, it can receive front-loaded RSs and additional RSs. A front-loaded RS is an RS configured as the starting symbol of the data channel, and an additional RS is an RS added to the following symbol of the front-loaded RS.

[0040] The amplification unit 220 is composed of a power amplifier (PA) or a low noise amplifier (LNA). The amplification unit 220 amplifies the wireless signal output from the wireless signal transceiver unit 210. Additionally, the amplification unit 220 amplifies the wireless signal output from the modem 230.

[0041] The modem 230 performs data modulation / demodulation, transmit power setting, and resource block allocation for each predetermined communication destination (gNB100 or other gNB). CP-OFDM / DFT-S-OFDM can also be applied in the modem 230. Furthermore, DFT-S-OFDM can be used not only for the uplink (UL) but also for the downlink (DL).

[0042] The control signal and reference signal processing unit 240 performs related processing of control signals, such as Radio Resource Control (RRC) signaling, that are transmitted and received with the gNB100.

[0043] The control signal and reference signal processing unit 240 performs related processing on reference signals transmitted and received with the gNB100, such as demodulation reference signal (DMRS), phase tracking reference signal (PTRS), channel state information-reference signal (CSI-RS), sounding reference signal (SRS), and positioning reference signal (PRS).

[0044] In addition, the channels include control channels and data channels. Control channels include the Physical Uplink Control Channel (PUCCH), Physical Downlink Control Channel (PDCCH), Physical Random Access Channel (PRACH), and Physical Broadcast Channel (PBCH). Data channels include the Physical Uplink Shared Channel (PUSCH) and Physical Downlink Shared Channel (PDSCH).

[0045] The encoding / decoding unit 250 performs segmentation / linking and encoding / decoding of the data contained in the wireless signal for each predetermined communication destination (gNB100 or other gNB).

[0046] Specifically, the encoder / decoder 250 decodes the data output from the modem 230 and concatenates the decoded data. Furthermore, the encoder / decoder 250 divides the data output from the data transceiver 260 into predetermined sizes and encodes the divided data.

[0047] The data transceiver unit 260 performs tasks such as assembling and decomposing data units (PDUs (Protocol Data Units) / SDUs (Service Data Units)) that constitute data between layers. These layers include the Media Access Control (MAC) layer, the Radio Link Control (RLC) layer, and the Packet Data Convergence Protocol (PDCP) layer. Furthermore, the data transceiver unit 260 performs error correction and retransmission control based on HARQ (Hybrid Automatic Repeat Request).

[0048] The control unit 270 controls the UE 200. For example, the control unit 270 controls the transmission and reception of wireless signals based on the wireless signal transceiver unit 210, the amplification based on the amplification unit 220, the data modulation / demodulation based on the modulation / demodulation unit 230, the signal processing based on the control signal / reference signal processing unit 240, the encoding / decoding based on the encoding / decoding unit 250, and the assembly / decomposition of data units based on the data transceiver unit 260.

[0049] In the implementation, the control unit 270 envisions that the RS is set according to each group defined in the cell formed by gNB100. Such an RS can also be called a group-specific RS (see [reference needed]). Figure 6 Additionally, the RS configured for each cell according to gNB100 can be called a cell-specific RS (see [reference]). Figure 6 , Figure 7 The RS set for each UE can be called the UE-specific RS.

[0050] The control unit 270 in the implementation embodiment envisions that the above-described group is set based on information related to the antenna port of the receiving RS. The information related to the antenna port of the receiving RS may be the number of antenna ports of the receiving RS. In addition, the information related to the antenna port of the receiving RS may be information on which antenna port is used for receiving RS (e.g., TPMI (transmitted precoding matrix indicator)), or whether MIMO implemented using multiple antenna ports is supported (e.g., whether parameters for MIMO are set).

[0051] The control unit 270 of the embodiment can be envisioned to have a precoder used for communication with gNB100 that is common (identical) among the UE200 in the above group, or it can be envisioned that it is different among the UE200 in the above group.

[0052] In the implementation of the control unit 270, it is also conceivable that when the wireless transceiver unit 210 receives multiple RSs, a portion of the multiple RSs are set according to each group described above, and the remaining portion of the multiple RSs are set according to each UE 200. For example, when the wireless transceiver unit 210 receives 3 DMRSs (e.g., a front-end RS and 2 additional RSs), it is conceivable that the front-end RSs are set according to each group described above, and the 2 additional RSs are set according to each UE 200.

[0053] The control unit 270 in the implementation embodiment may also be designed to determine the number of antenna ports for receiving RS set according to each UE 200 based on the number of antenna ports for receiving RS set according to each group and the total number of antenna ports (see reference). Figure 8 ).

[0054] (2.2) Functional block structure of base station

[0055] like Figure 5 As shown, the gNB100 has a wireless signal transceiver unit 110 and a control unit 120.

[0056] The wireless signal transceiver unit 110 transmits and receives wireless signals with the UE 200. The wireless signal transceiver unit 110 can be configured as a transmitting unit that sends wireless signals to the UE 200 and a receiving unit that receives wireless signals from the UE 200.

[0057] The wireless signal transceiver unit 110 of the embodiment transmits the above-mentioned reference signal to the UE200 in the cell formed by gNB100.

[0058] The control unit 120 controls the gNB 100. For example, the control unit 120 controls the transmission and reception of wireless signals performed by the wireless signal transceiver unit 110. In addition, the control unit 120 performs scheduling for the UE 200.

[0059] The control unit 120 of the implementation method sets the above-mentioned multiple groups in the cell formed by gNB100.

[0060] (3) Operation of wireless communication system

[0061] (3.1) Topic

[0062] If an RS (Resource Provider) is designated as a cell-specific RS, it is sent to all UEs within the cell. In this case, since RS resources are configured for UEs with a higher number of antenna ports (hereinafter also referred to as layers or streams), useless RS resources are generated that cannot be used by UEs with a lower number of antenna ports. For example, when RS resources are configured for UEs with four antenna ports, the RS resources for two antenna ports are wasted for UEs with two antenna ports.

[0063] It is believed that such problems arise between UEs within a cell not only due to differences in the number of antenna ports, but also due to differences in information related to the antenna ports (e.g., which antenna port is used, whether MIMO is supported).

[0064] (3.2) Example of an action

[0065] (3.2.1) Action Example 1

[0066] UE200 can envision that the DMRS for data channel decryption is configured on a per-group basis. Furthermore, while channel and RS are one example, other channels and RS can also be used. Additionally, "per-group" can be replaced with "by group" or "group specific," and "RS configured per group" can be replaced with "group specific RS."

[0067] like Figure 6 As shown, gNB100 can set both cell ID and group ID for UE200 within its own cell. UE200 is designed to have RS configured according to each group within its cell, using the configured group ID. Furthermore, in this specification, "configured RS" can be replaced with "configured RS resource," where "resource" is not limited to frequency-oriented resources but can also be understood as resources including time-oriented and spatial-oriented resources.

[0068] The group ID can be set based on the number of antenna ports (layers) of the UE200 receiving RS. For example, it can be set based on the number of antenna ports of the DMRS used for decrypting the receiving data channel. Figure 6 This example illustrates how different group IDs are assigned (grouped) to UE200 with one antenna port and UE200 with two antenna ports.

[0069] Therefore, RS settings can be configured according to the number of antenna ports of the UE200, thus suppressing the setting of RS resources that are useless to users with a small number of antenna ports.

[0070] Additionally, UE200 can be envisioned as not having a configured DMRS for data channel decryption without a configured group ID. In this case, it can be envisioned that neither a group-specific DMRS nor a UE-specific DMRS is configured.

[0071] (3.2.2) Action Example 2

[0072] UE200 can assume that the DMRS for data channel decryption is configured on a per-cell basis. Furthermore, while channel and RS are one example, other channels and RSs could also be used. Additionally, "per-cell basis" can be replaced with "on a cell basis" or "cell specific," and "RS configured on a per-cell basis" can be replaced with "cell specific RS."

[0073] like Figure 7 As shown, gNB100 can (re)configure the cell ID of UE200 within its own cell. UE200 is designed to configure RS according to each cell it belongs to by configuring the cell ID.

[0074] The cell ID can be set based on the number of antenna ports (layers) of the UE200 receiving RS. For example, it can be set based on the number of antenna ports of the DMRS used for decrypting the receiving data channel. Figure 7 This example illustrates how different cell IDs are assigned to UE200 with one antenna port and UE200 with two antenna ports.

[0075] The allocation of cell IDs corresponding to the number of antenna ports can be further generalized. For example, a cell ID#a can be assigned to a UE200 with X antenna ports receiving RS, cell ID#b can be assigned to a UE200 with X+1 antenna ports receiving RS, and so on. Alternatively, cell ID#a can be assigned to UE200s with X to Y antenna ports receiving RS (e.g., X=1, Y=4). Furthermore, X and Y can be uniquely determined by a standard, or they can be set / updated / indicated via RRC / MAC CE / DCI from the network.

[0076] Therefore, RS settings can be configured according to the number of antenna ports of the UE200, thus suppressing the setting of RS resources that are useless to users with a small number of antenna ports.

[0077] (3.2.3) Action Example 3

[0078] UE200 can be conceived as a DMRS for data channel de-calling, combining the group-dedicated RS of setting action example 1 and the RS set according to each terminal (UE-dedicated RS). In addition, UE200 can also be conceived as a DMRS for data channel de-calling, combining the cell-dedicated RS and UE-dedicated RS of setting action example 2.

[0079] For example, group-specific RS and UE-specific RS can be set in specific symbols / slots / subframes. Alternatively, they can be uniquely specified through standards.

[0080] Example 1: The front-end RS can be set as a group-dedicated RS, and the supplementary RS can be set as a UE-dedicated RS. In this case, Example 2: The RS of the Xth symbol can be set as the group-dedicated RS, and the RS of the Yth symbol can be set as the UE-dedicated RS.

[0081] Furthermore, the following options can be considered.

[0082] • Opt.1: Group-dedicated RS is always transmitted via 1 antenna port (Layer 1 transmission). In this case, no useless RS resources are generated for a UE200 with 1 antenna port.

[0083] • Opt.2: The number of transmit antenna ports for the dedicated RS group is set by the network (gNB100). In this case, the RS can be flexibly configured according to the number of antenna ports of the UE200.

[0084] (3.2.4) Action Example 4

[0085] UE200 can also determine the number of antenna ports for receiving the UE-dedicated RS based on the number of antenna ports of the receiving group's dedicated RS and the total number of receiving antenna ports (i.e., all antenna ports). For example, it can also be based on... Figure 8 The table shown is used to uniquely determine this. Figure 8 The table shown can also be replaced by the following formula.

[0086] Number of antenna ports for receiving UE-dedicated RS = Number of receiving antenna ports - Number of antenna ports for groups of dedicated RS

[0087] Figure 8 The table and formula shown are examples; for instance, the following formula can also be applied when determining the number of antenna ports for receiving a UE-dedicated RS.

[0088] Number of antenna ports for receiving UE-dedicated RS = (Number of receiving antenna ports - 1) - Number of antenna ports for receiving group-dedicated RS

[0089] (3.2.5) Pre-encoder

[0090] Regarding the precoder within the group in the above action example, UE200 can assume that the precoder is common (identical) among UE200s within the group. For example, UE200 can assume that the common RS within the group (e.g., the DMRS for decryption of the data channel) and the downlink channel (e.g., PDSCH / PDCCH) are in a quasi-co-located (QCL) relationship (applying the same precoder to both). Additionally, "in a QCL relationship" can be replaced with "same Transmission Configuration Indicator (TCI) state" or "same spatial relationship".

[0091] This allows for a reduction in the resources required to notify the precoder for each UE200.

[0092] Alternatively, in this case, a different precoder can be indicated for each UE200 via MAC CE / DCI.

[0093] On the other hand, regarding the precoder within the group in the above-described action example, UE200 may also envision that the precoders are different among UE200 within the group. As a premise, it is assumed that gNB100 notifies the precoder for each UE200. Furthermore, it is assumed that a different precoder is applied to the common RS within the group than the precoder notified to each UE200.

[0094] For example, UE200 can be envisioned receiving UE-dedicated RS based on applying a precoder notified from gNB100 to the antenna port of the common RS (e.g., the DMRS for decryption of data channels) within the receive group. Thus, UE200 can envision the UE-dedicated RS being in a quasi-co-located (QCL) relationship with the downlink channels (e.g., PDSCH / PDCCH).

[0095] Alternatively, UE200 may also be conceived as receiving downlink channels (e.g., PDSCH / PDCCH) based on applying a precoder notified from gNB100 to the antenna port of the common RS (e.g., DMRS for decalling data channels) within the receive group.

[0096] Therefore, compared with the cell-specific RS of LTE, the number of bits of the precoder indication can be reduced.

[0097] Furthermore, precoders can be set one per group or multiple precoders can be set. When multiple precoders are set, UE200 can select one and send the PMI of the selected precoder to the network (gNB100). Additionally, when the network (gNB100) notifies UE200 of multiple groups, UE200 can select one group (or the PMI associated with that group) and report the selected group to the network.

[0098] Alternatively, RRC can be used to switch whether UE200 is assumed to have the same or different precoders within the group.

[0099] (4) Function Effect

[0100] According to the above implementation method, in a wireless communication system, not only can channel resources be maximized by setting a common RS within the cell, but also RS resources that are useless to terminals with a small number of antenna ports in the common RS setting can be reduced. This contributes to minimum quality assurance such as throughput.

[0101] (5) Other implementation methods

[0102] The present invention has been described above according to the embodiments, but the present invention is not limited to these descriptions. It is obvious to those skilled in the art that various modifications and improvements can be made.

[0103] The above disclosure states that RS is primarily a DMRS for data channel demodulation, but is not limited to this. For example, RS can also be a CSI-RS or SRS used for CSI measurements. Furthermore, RS can also be a CSI-RS or Synchronization Signal / Broadcast Channel Block (SSB) used for Radio Resource Management (RRM) measurements. Additionally, since SSB is used for measurements in NR, it can be replaced with RS.

[0104] In the above disclosure, "layer number" can also be replaced with "rank number". In addition, "group specific" can also be replaced with terms such as "semi-cell specific", "group-based", "common". Furthermore, "data channel" can also be understood to include not only "PDSCH" mentioned above, but also "PUSCH".

[0105] The above examples of actions can be combined and applied in combination as long as they do not contradict each other.

[0106] In the above disclosure, configure, activate, update, indicate, enable, specify, and select can be interchanged. Similarly, link, associate, correspond, and map can be interchanged, as can allocate, assign, monitor, and map.

[0107] Furthermore, specific, dedicated, UE specific, and UE dedicated can be used interchangeably. Similarly, common, shared, group-common, UE common, and UE shared can also be used interchangeably.

[0108] The block structure diagram used in the above description of the embodiments ( Figure 4 , Figure 5 The diagram illustrates blocks organized by function. These functional blocks (structural units) are implemented through any combination of at least one of hardware and software. Furthermore, there are no particular limitations on the implementation method of each functional block. That is, each functional block can be implemented using a single device that is physically or logically combined, or by directly or indirectly (e.g., using wired, wireless, etc.) connecting two or more physically or logically separate devices. Functional blocks can also be implemented by combining software within the aforementioned single or multiple devices.

[0109] The functions include judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but are not limited to these. For example, a functional block (structural unit) that performs the sending function is called a transmitting unit or transmitter. In short, as mentioned above, there are no particular limitations on the implementation method.

[0110] Furthermore, the aforementioned gNB100 and UE200 (the device) can also function as a computer for processing the wireless communication method disclosed herein. Figure 9 This is a diagram illustrating an example of the hardware structure of the device. (As shown...) Figure 9 As shown, the device can also be configured as a computer device including a processor 1001, a memory 1002, a storage device 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0111] Additionally, in the following description, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware structure of this device can be configured as either a device comprising one or more of the illustrated components, or a device without any components.

[0112] The functional blocks of the device ( Figure 4 , Figure 5This can be achieved through any hardware element or combination of hardware elements in the computer device.

[0113] Furthermore, the functions of the device are implemented by reading predetermined software (programs) into hardware such as processor 1001 and memory 1002, so that processor 1001 performs calculations and controls communication of communication device 1004 or controls at least one of reading and writing data in memory 1002 and storage device 1003.

[0114] The processor 1001 controls the computer as a whole by instructing the operating system to operate. The processor 1001 may also be a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic units, registers, etc.

[0115] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one direction of memory 1002 in the storage device 1003 and the communication device 1004, and performs various processes accordingly. The program is used to cause the computer to perform at least a portion of the actions described in the above embodiments. Moreover, the various processes described above can be executed by one processor 1001, or by two or more processors 1001 simultaneously or sequentially. The processor 1001 can also be implemented using more than one chip. Additionally, the program can be transmitted from a network via a telecommunications line.

[0116] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of the following: Read Only Memory (ROM), Erasable Programmable Memory (EPROM), Electrically Erasable Programmable Memory (EEPROM), Random Access Memory (RAM). The memory 1002 may be referred to as a register, cache memory, main memory (main storage device), etc. The memory 1002 may store programs (program code), software modules, etc., capable of executing the methods involved in one embodiment of this disclosure.

[0117] Storage device 1003 is a computer-readable recording medium, and may be composed of at least one of the following: optical discs such as CD-ROM (Compact Disc ROM), hard disk drives, floppy disks, magneto-optical discs (e.g., compact discs, digital multipurpose discs, Blu-ray discs), smart cards, flash memory (e.g., cards, sticks, key drives), floppy disks, magnetic stripes, etc. Storage device 1003 may also be referred to as an auxiliary storage device. The aforementioned recording medium may, for example, be a database, server, or other suitable media that includes at least one of memory 1002 and storage device 1003.

[0118] The communication device 1004 is hardware (transceiver) used for communication between computers via at least one of a wired network and a wireless network. For example, it may also be called a network device, network controller, network card, communication module, etc.

[0119] The communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to realize at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0120] Input device 1005 is an input device that accepts input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, LED, etc.). Alternatively, input device 1005 and output device 1006 can also be integrated (e.g., a touch panel).

[0121] Furthermore, devices such as processor 1001 and memory 1002 are connected via bus 1007 for communicating information. Bus 1007 can be configured as a single bus or as different buses between devices.

[0122] Furthermore, the device can be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field-programmable gate array (FPGA), which can be used to implement some or all of the functional blocks. For example, the processor 1001 can also be implemented using at least one of these hardware components.

[0123] Furthermore, the notification of information is not limited to the forms / implementations described in this disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling), broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or combinations thereof. Additionally, RRC signaling may also be referred to as an RRC message, for example, it may be an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0124] The various forms / implementations described in this disclosure can also be applied to at least one of LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), other suitable systems, and next-generation systems extended therefrom. Furthermore, multiple systems can be combined (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) for application.

[0125] The processing steps, timing, and processes described in this disclosure can be rearranged in order without contradiction. For example, the illustrated order is used to indicate the elements of each step in the methods described in this disclosure, but the order is not limited to the specific order indicated.

[0126] In this disclosure, certain actions performed by the base station are sometimes also performed by its upper node, depending on the circumstances. In a network consisting of one or more network nodes having a base station, it is obvious that various actions performed to communicate with a terminal can be performed by at least one of the base station and other network nodes besides the base station (e.g., considering an MME or S-GW, but not limited to these). The above illustration depicts a case where there is only one other network node besides the base station, but it can also be a combination of multiple other network nodes (e.g., an MME and an S-GW).

[0127] It can output information and signals (information, etc.) from a higher (or lower) level to a lower (or higher) level. It can also be input or output through multiple network nodes.

[0128] Input or output information can be stored in a specific location (e.g., memory) or managed using a management table. Input or output information can be overwritten, updated, or appended. Output information can also be deleted. Input information can also be sent to other devices.

[0129] The determination can be made by the value represented by 1 bit (0 or 1), by a Boolean value (Boolean: true or false), or by comparing numerical values ​​(e.g., comparing with a predetermined value).

[0130] The various forms / implementations described in this disclosure can be used individually or in combination, and can be switched depending on the execution. Furthermore, the notification of predetermined information (e.g., a "It is X" notification) is not limited to being explicit, but can also be implicit (e.g., not being notified of the predetermined information).

[0131] Software, whether called software, firmware, middleware, microcode, hardware description language, or by other names, should be broadly interpreted as referring to commands, command sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0132] In addition, software, commands, and information can also be sent and received via transmission media. For example, when using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL) etc.) and wireless technologies (infrared, microwave, etc.) to send software from a webpage, server, or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission media.

[0133] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, the data, commands, instructions, information, signals, bits, symbols, chips, etc., that may be involved in the above description as a whole can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination of these.

[0134] Furthermore, the terms used in this disclosure and those necessary for understanding this disclosure may be replaced with terms that have the same or similar meanings. For example, at least one of the channel and symbol may also be a signal (signaling). Additionally, a signal may also be a message. Furthermore, a component carrier (CC) may also be referred to as carrier frequency, cell, frequency carrier, etc.

[0135] The terms “system” and “network” as used in this disclosure are used interchangeably.

[0136] Furthermore, the information, parameters, etc., described in this disclosure may be represented using absolute values, relative values ​​to predetermined values, or other corresponding information. For example, wireless resources may be indicated using indexes.

[0137] The names used for the above parameters are non-limiting in any respect. Furthermore, the formulas, etc., using these parameters may sometimes differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any appropriate name, and therefore the various names assigned to these channels and information elements are non-limiting in any respect.

[0138] In this disclosure, the terms "Base Station (BS)," "wireless base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" are used interchangeably. Sometimes, terms such as macro cell, small cell, femtocell, and picocell are also used to refer to base stations.

[0139] A base station can accommodate one or more (e.g., 3) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through the base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0140] Terms such as “cell” or “sector” refer to a portion or the entire coverage area of ​​at least one of the base stations and base station subsystems that provide communication services within that coverage area.

[0141] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" are used interchangeably.

[0142] For mobile stations, those skilled in the art sometimes also use the following terms: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handheld device, user agent, mobile client, client, or some other appropriate terms.

[0143] At least one of the base station and mobile station can also be referred to as a transmitting device, receiving device, communication device, etc. Additionally, at least one of the base station and mobile station can also be a device mounted on a mobile body, the mobile body itself, etc. This mobile body can be a vehicle (e.g., a car, an airplane, etc.), a mobile body moving in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanized or unmanned). Furthermore, at least one of the base station and mobile station also includes devices that do not necessarily move during communication. For example, at least one of the base station and mobile station can be an IoT (Internet of Things) device such as a sensor.

[0144] Furthermore, the base station in this disclosure can also be replaced by a mobile station (user terminal, hereinafter the same). For example, various forms / implementations of this disclosure can also be applied to structures that replace communication between the base station and the mobile station with communication between multiple mobile stations (e.g., also referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the structure can also be configured such that the mobile station has the functions of the base station. In addition, terms such as "uplink" and "downlink" can also be replaced with terms corresponding to communication between terminals (e.g., "side"). For example, uplink channel, downlink channel, etc., can also be replaced with side channel.

[0145] Similarly, the mobile station in this disclosure can be replaced by a base station. In this case, the base station can also be configured to have the functions of a mobile station.

[0146] A radio frame can consist of one or more frames in the time domain. In the time domain, one or more frames can be called subframes.

[0147] In the time domain, a subframe can also consist of one or more time slots. A subframe can be a fixed time length (e.g., 1 ms) that is independent of the parameter set (numerology).

[0148] A parameter set can be communication parameters applied to at least one of the transmission and reception of a signal or channel. For example, a parameter set can represent at least one of the following: Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transceiver in the frequency domain, and specific windowing processing performed by the transceiver in the time domain.

[0149] In the time domain, a time slot can be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). A time slot can be a time unit based on a set of parameters.

[0150] A time slot can contain multiple mini-time slots. Each mini-time slot can consist of one or more symbols in the time domain. Furthermore, a mini-time slot can also be called a sub-time slot. A mini-time slot can consist of fewer symbols than a time slot. PDSCH (or PUSCH) transmitted in time units larger than mini-time slots can be called PDSCH (or PUSCH) mapping type (type) A. PDSCH (or PUSCH) transmitted using mini-time slots can be called PDSCH (or PUSCH) mapping type (type) B.

[0151] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols can each be referred to by other corresponding names.

[0152] For example, a single subframe can be called a Transmission Time Interval (TTI), multiple consecutive subframes can also be called a TTI, and a single time slot or a single mini-time slot can also be called a TTI. That is, at least one of a subframe or TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Furthermore, the unit representing TTI may not be called a subframe, but rather a time slot, mini-time slot, etc.

[0153] Here, TTI refers, for example, to the smallest unit of time for scheduling in wireless communication. For instance, in an LTE system, the base station schedules the allocation of radio resources (bandwidth, transmit power, etc., available to each user terminal) in units of TTI. However, the definition of TTI is not limited to this.

[0154] The Time Interval (TTI) can be a unit of time for transmitting channel-coded data packets (transmission blocks), code blocks, codewords, etc., or it can be a processing unit such as scheduling or link adaptation. Furthermore, when a TTI is given, the actual time interval (e.g., the number of symbols) that the transmission block, code block, codeword, etc., are mapped to can be shorter than the given TTI.

[0155] Furthermore, when one time slot or one mini time slot is referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini time slot) can become the minimum time unit for scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of the schedule can be controlled.

[0156] A TTI with a duration of 1ms is also called a normal TTI (TTI in LTE Rel.8-12), a long TTI, a normal subframe, a long subframe, or a time slot. A TTI shorter than a normal TTI can also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini time slot, a sub-time slot, or a time slot.

[0157] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can be understood as a TTI with a duration of more than 1ms, and a short TTI (e.g., a shortened TTI, etc.) can be understood as a TTI with a duration of less than a long TTI but more than 1ms.

[0158] A resource block (RB) is a unit of resource allocation in both the time and frequency domains. In the frequency domain, it can contain one or more consecutive subcarriers. The number of subcarriers contained in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers contained in an RB can also be determined based on the parameter set.

[0159] Furthermore, the temporal domain of an RB can contain one or more symbols, which can be a time slot, a mini-time slot, a subframe, or the length of a TTI. A TTI, a subframe, etc., can each be composed of one or more resource blocks.

[0160] In addition, one or more RBs can also be called Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0161] Furthermore, a resource block can consist of one or more resource elements (REs). For example, one RE can be a radio resource area consisting of one subcarrier and one symbol.

[0162] The Bandwidth Part (BWP) (also known as partial bandwidth, etc.) represents a subset of contiguous common resource blocks (RBs) used for a specific parameter set on a given carrier. Here, common RBs can be determined by indexing RBs based on a common reference point of that carrier. PRBs can be defined and numbered within a BWP.

[0163] A BWP can include a UL BWP and a DL BWP. One or more BWPs can be set for a UE within a single carrier.

[0164] At least one of the configured BWPs can be active, and the scenario of the UE transmitting or receiving predetermined signals / channels outside of the active BWP is not considered. Furthermore, the terms "cell," "carrier," etc., used in this disclosure can be replaced with "BWP."

[0165] The structures of radio frames, subframes, time slots, mini-time slots, and symbols described above are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained within a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other structures can be varied in many ways.

[0166] The terms “connected,” “coupled,” or any variations thereof are intended to indicate any direct or indirect connection or combination between two or more elements, including cases where there is one or more intermediate elements between the two elements that are “connected” or “coupled.” The combination or connection between elements can be physical, logical, or a combination of these. For example, “access” can be used instead of “connected.” In the context of this disclosure, it can be understood that two elements are “connected” or “coupled” to each other using at least one of one or more wires, cables, and printed electrical connections, and, as some non-limiting and non-inclusive examples, using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, and light (including both visible and invisible regions) to “connect” or “couple” to each other.

[0167] The reference signal can be simply called the Reference Signal (RS), or, depending on the standard applied, the pilot.

[0168] As used in this disclosure, the word "based on" does not mean "based on only" unless otherwise expressly stated. In other words, the word "based on" means both "based on only" and "based on at least".

[0169] Alternatively, the "unit" in the structure of the above devices can be replaced with "section", "circuit", "equipment", etc.

[0170] Any reference to elements using the designations "first," "second," etc., as used in this disclosure does not necessarily limit the number or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, reference to the first and second elements does not imply that only two elements can be used there, or that the first element must precede the second element in some form.

[0171] When the terms "include," "including," and their variations are used in this disclosure, these terms, like the term "comprising," imply inclusion. Furthermore, the term "or" as used in this disclosure does not refer to XOR.

[0172] In this disclosure, for example, in cases where articles are added through translation, such as in English (a, an, and the), this disclosure also includes cases where the noun following these articles is in a plural form.

[0173] The terms "determining" and "determining" as used in this disclosure sometimes encompass a variety of actions. For example, "determining" or "determining" may include actions such as judging, calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, database, or other data structure), and ascertaining, which are considered as actions of "determining" or "determining." Furthermore, "determining" or "determining" may include actions such as receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, and accessing (e.g., accessing data in memory), which are considered as actions of "determining" or "determining." Additionally, "determining" or "determining" may include actions such as resolving, selecting, choosing, establishing, and comparing, which are considered as actions of "determining" or "determining." That is, "judgment" and "decision" can include matters that are considered as having been "judged" or "decided". In addition, "judgment (decision)" can also be replaced by "assuming", "expecting", "considering", etc.

[0174] In this disclosure, the phrase "A and B are different" can mean "A and B are not the same." Additionally, this phrase can also mean "A and B are each different from C." Terms such as "separate" and "combined" can also be interpreted in the same way as "different."

[0175] Figure 10 An example of the structure of vehicle 2001 is shown. For example... Figure 10 As shown, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a gear shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013.

[0176] The drive unit 2002 may consist of, for example, an engine, a motor, or a hybrid power system of an engine and a motor.

[0177] The steering unit 2003 includes at least a steering wheel (also called a steering wheel), configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0178] The electronic control unit 2010 consists of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (I / O port) 2033. Signals from various sensors 2021 to 2027 of the vehicle are input to the electronic control unit 2010. The electronic control unit 2010 can also be referred to as an ECU (Electronic Control Unit).

[0179] The signals from various sensors 2021 to 2028 include current signals from current sensor 2021 that senses the current of the motor, speed signals of the front and rear wheels obtained by speed sensor 2022, air pressure signals of the front and rear wheels obtained by air pressure sensor 2023, vehicle speed signals obtained by vehicle speed sensor 2024, acceleration signals obtained by acceleration sensor 2025, accelerator pedal input signals obtained by accelerator pedal sensor 2029, brake pedal input signals obtained by brake pedal sensor 2026, gear lever operation signals obtained by gear lever sensor 2027, and detection signals obtained by object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0180] The Information Service Unit 2012 consists of various devices such as a car navigation system, audio system, speakers, television, and radio, which provide various information such as driving information, traffic information, and entertainment information, and one or more ECUs that control these devices. The Information Service Unit 2012 uses information obtained from external devices via a communication module 2013, etc., to provide various multimedia information and multimedia services to the occupants of vehicle 1.

[0181] The Driver Assistance System 2030 comprises various devices used to prevent accidents or reduce driver workload, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning devices (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps), gyroscope systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System)), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. Furthermore, the Driver Assistance System 2030 transmits and receives various information via the communication module 2013 to achieve driver assistance or autonomous driving functions.

[0182] The communication module 2013 can communicate with the microprocessor 2031 and the components of the vehicle 1 via the communication port. For example, the communication module 2013 can send and receive data with the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, gear shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axle 2009, microprocessor 2031 in the electronic control unit 2010, memory (ROM, RAM) 2032, and sensors 2021 to 2028 in the vehicle 2001 via the communication port 2033.

[0183] The communication module 2013, controlled by the microprocessor 2031 of the electronic control unit 2010, is a communication device capable of communicating with external devices. For example, it can transmit and receive various types of information with external devices via wireless communication. The communication module 2013 can be located inside or outside the electronic control unit 2010. External devices can be, for example, base stations, mobile stations, etc.

[0184] The communication module 2013 transmits the current signal from the current sensor input to the electronic control unit 2010 to an external device via wireless communication. Additionally, the communication module 2013 also transmits the following signals input to the electronic control unit 2010 via wireless communication to external devices: the front and rear wheel speed signals obtained by the speed sensor 2022; the front and rear wheel air pressure signals obtained by the air pressure sensor 2023; the vehicle speed signal obtained by the vehicle speed sensor 2024; the acceleration signal obtained by the acceleration sensor 2025; the accelerator pedal depressor signal obtained by the accelerator pedal sensor 2029; the brake pedal depressor signal obtained by the brake pedal sensor 2026; the gear shift lever operation signal obtained by the gear shift lever sensor 2027; and the detection signals for detecting obstacles, vehicles, pedestrians, etc., obtained by the object detection sensor 2028.

[0185] The communication module 2013 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) sent from external devices and displays it on the information service unit 2012 of the vehicle. Furthermore, the communication module 2013 stores the various information received from external devices in a memory 2032 available to the microprocessor 2031. The microprocessor 2031 can also control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, gearshift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axles 2009, and sensors 2021-2028 of the vehicle 2001 based on the information stored in the memory 2032.

[0186] The present disclosure has been described in detail above, but it will be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the present disclosure is for illustrative purposes only and is not intended to be limiting.

[0187] (Postscript)

[0188] The above disclosure can also be expressed as follows.

[0189] The first feature is a terminal having: a receiving unit that receives a reference signal in a cell formed by a base station; and a control unit that assumes the reference signal is set according to each group within the cell, the control unit assuming the group is set based on information related to the antenna port receiving the reference signal.

[0190] In the first feature, the control unit assumes that the group is set based on the number of antenna ports that receive the reference signal.

[0191] In the third feature, in the first or second feature, the control unit envisions that the precoder used for communication with the base station is common among the terminals in the group.

[0192] The fourth feature of the terminal is that, in the first or second feature, the control unit envisions that the precoder used for communication with the base station is different among the terminals in the group.

[0193] In the fifth feature of the terminal, in any one of the first to fourth features, the receiving unit receives a plurality of the reference signals, and the control unit assumes that a portion of the plurality of reference signals is set according to each group, and the remaining portion of the plurality of reference signals is set according to each terminal.

[0194] In the fifth feature, the control unit of the sixth feature determines the number of antenna ports that receive the reference signal set according to each of the terminals based on the number of antenna ports that receive the reference signal set according to each group and the total number of antenna ports.

[0195] Label Explanation

[0196] 10: Wireless Communication System

[0197] 20: NG-RAN

[0198] 100: gNB

[0199] 110: Wireless Signal Transceiver Unit

[0200] 120: Control Department

[0201] 200:UE

[0202] 210: Wireless Signal Transceiver Unit

[0203] 220: Enlarged section

[0204] 230: Modulation and Demodulation Section

[0205] 240: Control Signal & Reference Signal Processing Unit

[0206] 250: Encoding / Decoding Section

[0207] 260: Data Transceiver Department

[0208] 270: Control Department

[0209] 1001: Processor

[0210] 1002: Memory

[0211] 1003: Storage device

[0212] 1004: Communication device

[0213] 1005: Input device

[0214] 1006: Output device

[0215] 1007: Bus

[0216] 2001: Vehicles

[0217] 2002: Drive Unit

[0218] 2003: Steering Unit

[0219] 2004: Accelerator Pedal

[0220] 2005: Brake Pedal

[0221] 2006: Gear Shift

[0222] 2007: Left and right front wheels

[0223] 2008: Left and right rear wheels

[0224] 2009: Axle

[0225] 2010: Electronic Control Department

[0226] 2012: Information Services Department

[0227] 2013: Communication Module

[0228] 2021: Current Sensor

[0229] 2022: Speed ​​Sensor

[0230] 2023: Barometric Pressure Sensor

[0231] 2024: Vehicle Speed ​​Sensor

[0232] 2025: Accelerometer

[0233] 2026: Brake Pedal Sensor

[0234] 2027: Gearshift Sensor

[0235] 2028: Object Detection Sensor

[0236] 2029: Accelerator Pedal Sensor

[0237] 2030: Driver Assistance Systems Department

[0238] 2031: Microprocessors

[0239] 2032: Memory (ROM, RAM)

[0240] 2033: Communication Port

Claims

1. A terminal having: The receiving unit receives reference signals within the cell formed by the base station; and The control unit assumes that the reference signal is set according to each group within the cell. The control unit assumes that the group is set based on information related to the antenna port that receives the reference signal.

2. The terminal according to claim 1, wherein, The control unit envisions that the group is set based on the number of antenna ports that receive the reference signal.

3. The terminal according to claim 1, wherein, The control unit envisions that the precoder used for communication with the base station is common among the terminals within the group.

4. The terminal according to claim 1, wherein, The control unit envisions that the precoder used for communication with the base station is different among the terminals within the group.

5. The terminal according to claim 1, wherein, The receiving unit receives multiple reference signals. The control unit envisions that a portion of the plurality of reference signals is set according to each of the groups, and the remainder of the plurality of reference signals is set according to each of the terminals.

6. The terminal according to claim 5, wherein, The control unit determines the number of antenna ports to receive the reference signal set for each terminal based on the number of antenna ports to receive the reference signal set for each group and the total number of antenna ports.

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