RU2801115C2 - User device and base station - Google Patents

Abstract

FIELD: wireless communication.

SUBSTANCE: communication method performed by the terminal (20) includes: receiving a first number of Multiple Input Multiple Output (MIMO) communication layers configured for a portion of a frequency band (BWP) and a second number of MIMO layers configured for each cells, from the base station (10), wherein the second number of MIMO levels is a parameter different from the first number of MIMO levels; and controlling communication with the base station (10) using the first number of MIMO layers to reduce power consumption.

EFFECT: increasing the efficiency of communication in a wireless communication system through the use of a rational number of MIMO levels in the user device.

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Description

The field of technology to which the invention belongs

The present invention relates to a user device and a base station in a wireless communication system.

State of the art

For the "New Radio System" (English New Radio, NR) (also called 5G), or a system that replaces the "Long Term Evolution" (Long Term Evolution, LTE), technologies are being discussed that should make it possible to meet the following requirements Features: high system capacity, high data transfer rate, low latency, providing connection to a large number of terminals at the same time, low cost, energy saving, etc. (for example, Non-Patent Document 1).

NR employs a method in which the user device uses only a portion of the carrier bandwidth (Bandwidth part, BWP). BWP consists of the following Physical Resource Blocks (PRB) without gaps. In both downlink and uplink, up to four BWPs can be configured for a user device. When multiple BWPs are configured, the user device communicates using one active BWP (eg, non-patent document 2).

List of Cited Materials

Non-Patent Documents

[Non-Patent Document 1] 3GPP TS 38.300 V15.3.0 (2018-09)

[Non-Patent Document 2] 3GPP TS 38.213 V15.3.0 (2018-09)

Disclosure of invention

Technical task

In the NR wireless communication system, the bandwidth used by the user equipment can be reduced using BWP technology. However, in Multiple Input Multiple Output (MIMO) communication, when the number of layers configured for a user device is large, it is difficult to reduce power consumption.

The present invention has been developed in view of the foregoing and aims to improve communication efficiency in a wireless communication system by enabling a user device to use an adequate number of MIMO layers.

The solution of the problem

According to an embodiment of the present invention, a user equipment is provided, comprising: a receiving module configured to receive a first number of MIMO layers and a second number of MIMO layers from a base station; a control module, configured to select the first number of MIMO levels or the second number of MIMO levels depending on the communication state; and a communication module configured to communicate using the selected number of MIMO layers, wherein the first number of MIMO layers is configured for the default BWP or the original BWP and the second number of MIMO layers is configured for each cell.

Beneficial Effects of the Invention

According to an embodiment of the present invention, it is possible to improve communication efficiency in a wireless communication system by using an adequate number of MIMO layers in a user equipment.

Brief description of the drawings

Fig. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention.

Fig. 2 is a diagram illustrating parts of a frequency band (BWP).

Fig. 3 is a flowchart illustrating a communication configuration example (1).

Fig. 4 is a flowchart illustrating a communication configuration example (2).

Fig. 5 is a block diagram illustrating a first operation example in an embodiment of the present invention.

Fig. 6 shows an example (1) of specification change according to the first operation example in an embodiment of the present invention.

Fig. 7 shows an example (2) of changing the specification according to the first operation example in an embodiment of the present invention.

Fig. 8 shows specification change example (3) according to the first operation example in an embodiment of the present invention.

Fig. 9 shows specification change example (4) according to the first operation example in the embodiment of the present invention.

Fig. 10 shows an example (5) of changing the specification according to the first operation example in the embodiment of the present invention.

Fig. 11 is a block diagram illustrating a second operation example in an embodiment of the present invention.

Fig. 12 shows an example (1) of specification change according to the second operation example in an embodiment of the present invention.

Fig. 13 shows specification change example (2) according to the second operation example in the embodiment of the present invention.

Fig. 14 shows specification change example (3) according to the second operation example in the embodiment of the present invention.

Fig. 15 shows specification change example (4) according to the second operation example in the embodiment of the present invention.

Fig. 16 shows specification change example (5) according to the second operation example in the embodiment of the present invention.

Fig. 17 is an example of a functional diagram of a base station 10 according to an embodiment of the present invention.

Fig. 18 is an example of a functional diagram of a user device 20 according to an embodiment of the present invention.

Fig. 19 shows an example of a hardware configuration of a base station 10 and a user equipment 20 according to an embodiment of the present invention.

Implementation of the invention

The following describes one or more embodiments of the present invention with reference to these drawings. It should be noted that the embodiments described below are examples only. Embodiments of the present invention are not limited to the embodiments described below.

Known technologies are used in the operations of the wireless communication system according to an embodiment of the present invention where required. The technologies of the existing LTE system are taken as an example, but are not limited to this system. The term "LTE" in this disclosure is understood, unless specifically indicated otherwise, in a broad sense, covering also the LTE-Advanced scheme and later schemes (eg, the NR scheme).

In the following embodiments of the present invention, terms from the existing LTE are used, for example, "synchronization signal" (eng. Synchronization Signal, SS), "primary synchronization signal" (eng. Primary SS, PSS), "secondary synchronization signal" (eng. Secondary SS, SSS), "Physical Broadcast Channel" (Physical Broadcast Channel, RVSN), "Physical Random Access Channel" (Physical Random Access Channel, PRACH), etc. These specific terms are used for convenience of description only. Signals, function blocks, etc. corresponding to the above terms may be referred to by other names. In the NR system, the above terms correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, the signal designation used for NR may not have the "NR-" prefix.

In an embodiment of the present invention, Time Division Duplex (TDD), Frequency Division Duplex (FDD), or other methods (for example, flexible duplex or t .P.).

In an embodiment of the present invention, the expression "configured (set) radio parameters (wireless communication)" may mean that a predetermined value is configured in advance, or that a radio parameter value specified by the base station 10 or the user device 20 is configured.

Fig. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. As shown in FIG. 1, this wireless communication system includes a base station 10 and a user device 20. In FIG. 1 shows one base station 10 and one user device 20 by way of example. However, there may be multiple base stations 10 and multiple user devices 20.

The base station 10 is a communication device configured to form one or more cells and communicate wirelessly with the user device 20. The physical resources of the radio signal can be defined in the time domain and in the frequency domain; resources in the time domain can be given by the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and in the frequency domain by the number of sub-carriers or resource blocks. The base station 10 is configured to transmit to the user device 20 a synchronization signal and system information. Said synchronization signal is, for example, NR-PSS and NR-SSS. Said system information is transmitted via NR-PBCH, for example, and may be referred to as broadcast information. As shown in FIG. 1, the base station 10 is configured to transmit a downlink control or data signal to the user device 20 and to receive the uplink control or data signal from the user device 20. The base station 10 and the user device 20 are configured to transmit and receive the signal. using beamforming. In addition, both the base station 10 and the user equipment 20 are capable of using multiple input multiple output (MIMO) communication in the downlink or uplink. Further, both the base station 10 and the user equipment 20 are configured to communicate via a secondary cell (English Secondary Cell, SCell) and a primary cell (English Primary Cell, PCell) using carrier aggregation (AN).

The user device 20 may be a communication device including a wireless communication functional module, such as a smartphone, mobile phone, tablet, handheld terminal, or machine-to-machine (M2M) communication module. Shown in FIG. 1, user equipment 20 is configured to use a variety of communication services provided by a wireless communication system by receiving control or data signals from base station 10 on the downlink and transmitting control or data signals to base station 10 on the uplink.

Fig. 2 is a diagram illustrating parts of a frequency band (BWP). Fig. 2 illustrates an example in which four BWPs are configured: BWP#0, BWP#1, BWP#2, and BWP#3. Shown in FIG. 2, four BWPs may be configured for downlink or uplink. The four BWPs shown in FIG. 2 are located within the carrier band of the cell. BWP#0 is called the original BWP. The initial BWP may be specified from higher layers, or specified as part of the control resource set of the common Physical Downlink Control Channel (PDCCH) type 0 search space, and used when establishing connections. The BWP in use is called the active BWP. When multiple BWPs are configured, only one of them can be the active BWP. The BWP that is used when the inactivity timer for the BWP has expired is called the Default BWP. When a default BWP is not specified by an upstream layer, the original BWP is used as the default BWP. It should be noted that in the following description of the initial BWP, it may be the initial downstream BWP or the initial upstream BWP. Similarly, in the following description, the default BWP may be a downstream default BWP or an upstream default BWP. Similarly, in the following description, an active BWP may be an active downstream BWP or an active upstream BWP.

In the present invention, the base station 10 is configured to transmit to the user equipment 20 the number of MIMO layers to be used for each cell. Further, the expression "number of MIMO levels to be used" may correspond to the largest number of levels that are available for use. Further, the expression "number of MIMO layers" may correspond to the number of receive antennas (Rx) or transmit antennas (Tx) to be used.

Fig. 3 is a flowchart illustrating a communication configuration example (1). In FIG. 3, the base station 10 performs configuration related to cell, BWP, MIMO communication, and Discontinuous Reception (DRX) for the user equipment 20 (configures the user equipment 20 for cell, BWP, MIMO communication, and DRX) .

In step S11, the base station 10 sends an RRC reconfiguration message to the user equipment 20 . RRCReconfiguration is a Radio Resource Control (RRC) layer message containing configurations (settings) related to cells, frequency bands (BWP), MIMO and DRX communications. Thereafter, the user equipment 20 transmits an RRC Reconfiguration Complete (RRCReconfigurationComplete) message (S12) to the base station 10.

In step S13, using the cell, BWP, MIMO and DRX related settings contained in the RRCReconfiguration, the user equipment 20 performs normal communication with the base station 10.

Fig. 4 is a flowchart illustrating a communication configuration example (2). In FIG. 4, the user equipment 20 establishes a connection, and the base station 10 performs configuration related to cell, BWP, MIMO communication, and DRX for the user equipment 20.

In step S21, the user equipment 20 transmits an RRC setup request (RRRCSetupRequest) message to the base station 10 . RRCSetupRequest is an RRC layer message sent when a connection is established. Thereafter, the base station 10 transmits an RRC Setup (RRCSetup) message (S22) to the user equipment 20 . RRCSetup is an RRC layer message containing cell, BWP, MIMO and DRX related configurations. Then, the user equipment 20 transmits an RRC Setup Complete (RRCSetupComplete) message to the base station 10 (S23).

In step S24, using the cell, BWP, MIMO and DRX related settings contained in the RRCReconfiguration, the user equipment 20 performs normal communication with the base station 10.

Fig. 5 is a block diagram illustrating a first operation example according to an embodiment of the present invention. In addition to being able to report to the user device 20 the number of MIMO layers to be used for each cell, the base station 10 is configured to separately report the number of MIMO layers to be used in relation to the default or initial BWP. For example, the default BWP or the original BWP may be configured with a number of MIMO layers that is less than the number of MIMO layers used for each cell. The expression "configured for each cell" may correspond to the expression "configured for each elementary carrier (EC)".

In step S31, it is assumed that the active BWP is the default BWP or the original BWP of the SCell of the user equipment 20. Then, the SCell enters the deactivated state (S32). Thereafter, the user device 20 uses the number of MIMO layers configured for the default BWP or for the original BWP (S33).

In step S34, the SCell enters the activated state. Thereafter, the user equipment 20 uses the number of MIMO layers configured for each EH (S35).

In other words, when the SCell is in the disabled state, the number of MIMO layers configured for the default or initial BWP is used, and when the SCell is in the enabled state, the number of MIMO layers configured for each cell is used. Note that the base station 10 can determine the number of MIMO layers to be used by the user equipment 20 in the same manner as in steps S31 to S35 of the above flowchart, and communicate.

Fig. 6 shows an example (1) of specification change according to the first operation example in an embodiment of the present invention. The specification shown in Fig. 6 defines a portion of the SCell activation or deactivation operations. When SCell is enabled, the maxMIMO-LayerDL value configured via PDSCH-ServingCellConfig and the maxMIMO-LayerUL value configured via PUSCH-ServingCellConfig shall be used. In other words, the number of MIMO layers configured for each cell is used.

When the SCell is in the disabled state and the active BWP is the default BWP or the original BWP, the maxMIMO-LayerDL value configured via PDSCH-Config and the maxMIMO-LayerUL value configured via PUSCH-Config shall be used. In other words, the number of MIMO layers configured for the default BWP or for the original BWP is used.

Fig. 7 shows an example (2) of changing the specification according to the first operation example in an embodiment of the present invention. Fig. 7 illustrates an example of PDSCH-Config specifications. The number of MIMO layers configured for the default BWP or for the initial BWP that is used when the SCell is in the disabled state is reported to the user device 20 via PDSCH-Config. Note that DefBWP specifies the default downstream BWP.

Fig. 8 shows specification change example (3) according to the first operation example in the embodiment of the present invention. Fig. 8 illustrates an example PDSCH-ServingCellConfig specification. The number of MIMO layers configured for each cell is reported to the user equipment 20 via PDSCH-ServingCellConfig.

Fig. 9 shows specification change example (4) according to the first operation example in the embodiment of the present invention. Fig. 9 illustrates an example of PUSCH-Config specifications. The number of MIMO layers configured for the default BWP or for the initial BWP that is used when the SCell is in the disabled state is reported to the user device 20 via PUSCH-Config. Note that DefBWP specifies the default downstream BWP.

Fig. 10 shows an example (5) of changing the specification according to the first operation example in the embodiment of the present invention. Fig. 10 illustrates an example PUSCH-ServingCellConfig specification. The number of MIMO layers configured for each cell is reported to the user equipment 20 via PUSCH-ServingCellConfig.

Fig. 11 is a block diagram illustrating a second operation example according to an embodiment of the present invention. In addition to being able to report to the user device 20 the number of MIMO layers to be used for each cell, the base station 10 is configured to separately report the number of MIMO layers to be used in relation to the default or initial BWP. For example, the default BWP or the original BWP may be configured with a number of MIMO layers that is less than the number of MIMO layers used for each cell.

In step S41, it is assumed that the active BWP is the default BWP or the original BWP of the SCell of the user equipment 20. Then, the serving cell's DRX (drx-lnactive Timer) timer expires (S42). Thereafter, the user device 20 uses the number of MIMO layers configured for the default BWP or for the original BWP (S43).

In step S44, the user equipment 20 receives PDCCHs that are instructed to perform a new reception or transmission. Thereafter, the user equipment 20 uses the number of MIMO layers configured for each EH (S45).

In other words, when the serving cell's DRX inactivity timer expires, the number of MIMO layers configured for the default BWP or for the original BWP is used, and when a new reception or transmission occurs on the PDCCH, the number of MIMO layers configured for each cell is used. Note that the base station 10 can determine the number of MIMO layers to be used by the user equipment 20 in the same manner as in steps S41 to S45 of the above flowchart, and communicate.

Fig. 12 shows an example (1) of specification change according to the second operation example in an embodiment of the present invention. The specification shown in Fig. 12 defines a portion of the operations related to DRX. When the DRX inactivity timer expires, the maxMIMO-LayerDL value configured by PDSCH-ServingCellConfig and the maxMIMO-LayerUL value configured by PUSCH-ServingCellConfig are used. In other words, the number of MIMO layers configured for the default BWP or for the original BWP is used.

When a new reception or transmission occurs on the PDCCH, the maxMIMO-LayerDL value configured by PDSCH-ServingCellConfig and the maxMIMO-LayerUL value configured by PUSCH-ServingCellConfig are used. In other words, the number of MIMO layers configured for each cell is used.

Fig. 13 shows specification change example (2) according to the second operation example in the embodiment of the present invention. Fig. 13 illustrates an example of PDSCH-Config specifications. The number of MIMO layers configured for the default BWP or for the initial BWP that is used when the DRX-Config is set (configured) is reported to the user equipment 20 via PDSCH-Config. DRX-Config is a configuration related to DRX. Note that DefBWP specifies the default downstream BWP.

Fig. 14 shows specification change example (3) according to the second operation example in the embodiment of the present invention. Fig. 14 illustrates an example PDSCH-ServingCellConfig specification. The number of MIMO layers configured for each cell is reported to the user equipment 20 via PDSCH-ServingCellConfig.

Fig. 15 shows specification change example (4) according to the second operation example in the embodiment of the present invention. Fig. 15 illustrates an example of PUSCH-Config specifications. The number of MIMO layers configured for the default BWP or for the initial BWP that is used when the DRX-Config is configured is reported to the user equipment 20 via PUSCH-Config. Note that DefBWP specifies the default downstream BWP.

Fig. 16 shows specification change example (5) according to the second operation example in the embodiment of the present invention. Fig. 16 illustrates an example PUSCH-ServingCellConfig specification. The number of MIMO layers configured for each cell is reported to the user equipment 20 via PUSCH-ServingCellConfig.

According to the above-described embodiment of the present invention, it is possible for the user equipment 20 to change the number of MIMO layers to be used according to the communication state. For example, when BWP technology is used to reduce the bandwidth used by the user equipment 20, the effect of reducing power consumption can be obtained by reducing the number of MIMO layers. For example, when the SCell has transitioned to the deactivated state, the user equipment 20 uses the number of MIMO layers configured for the default BWP or the original BWP, and when the SCell has transitioned to the activated state, the user equipment 20 uses the number of MIMO layers configured for each cell. Or, for example, the user device 20 uses the number of MIMO layers configured for the default BWP or for the initial BWP when the DRX inactivity timer expires, and when a new reception or transmission occurs on the PDCCH, uses the number of MIMO layers configured for each cell.

In other words, in a wireless communication system, communication efficiency can be improved by ensuring that the user equipment uses an adequate number of MIMO layers.

(Structural diagrams of devices)

The following describes examples of functional configurations of the base station 10 and the user equipment 20, configured to implement the above-described processes and operations. Both base station 10 and user device 20 contain functional elements for implementing an embodiment of the present invention. It should be appreciated that both the base station 10 and the user device 20 may contain only a portion of the functional elements for implementing an embodiment of the present invention.

<Base Station 10>

Fig. 17 is an example of a functional diagram of the base station 10. As shown in FIG. 17, the base station 10 includes a transmission module 110, a reception module 120, a setting module 130, and a control module 140. The functional diagram shown in Fig. 17 is just an example. The division by function and the names of functional modules can be anything, as long as these modules can perform operations according to an embodiment of the present invention.

The transmission module 110 includes a functional element for generating a signal to be transmitted to the user device 20 and for wireless transmission of this signal. The receiving unit 120 includes a functional element for receiving various signals transmitted from the user equipment 20 and for deriving, for example, upper layer information from the received signal. In addition, the transmission unit 110 includes a function for transmitting NR-PSS, NR-SSS, NR-PBCH, downlink/uplink control signals, and so on, to the user equipment 20.

The setting unit 130 is configured to store predetermined configuration information (settings) and various items of configuration information (settings) to be transmitted to the user device 20 in the storage device and read them from the storage device if necessary. The content of said configuration information (settings) is, for example, a communication configuration related to cells of the user equipment 20, a communication configuration (setting) related to BWP, a configuration (setting) related to transmission and reception using MIMO, a configuration (setting), related to DRX, etc.

As described in the embodiment of the present invention, the control module 140 is configured to generate a communication configuration related to cells or portions of a frequency band (BWP) of the user device 20. In addition, the control module 140 is configured to report to the user device 20 the number MIMO levels that can be used. The control module 140 is also configured to control communication using DRX. Functional elements in the control module 140 related to signal transmission may be contained in the transmission module 110, and functional elements in the control module 140 related to signal reception may be contained in the reception module 120.

<User device 20>

Fig. 18 is an example of a functional diagram of the user device 20. As shown in FIG. 18, the user equipment 20 includes a transmission module 210, a reception module 220, a setting module 230, and a control module 240. The functional diagram shown in Fig. 18 is just an example. The division by function and the names of functional modules can be anything, as long as these modules can perform operations according to an embodiment of the present invention.

The transmission module 210 is configured to generate a signal to be transmitted from the data to be transmitted, and to wirelessly transmit the signal. The receiving module 220 is configured to wirelessly receive various signals and to obtain higher layer signals from the received physical layer signals. In addition, the receiving unit 220 includes a functional element for receiving NR-PSS, NR-SSS, NR-PBCH, downlink/uplink control signals, or the like, transmitted from the base station 10. In addition, for example, for direct communication between devices (Device-to-Device, D2D), the transmission module is configured to transfer to another user device 20 a physical direct control channel (Physical Sidelink Control Channel, PSCCH), a physical direct common channel (Physical Sidelink Shared Channel, PSSCH), Physical Direct Channel Discovery (Physical Sidelink Discovery Channel, PSDCH), Physical Direct Broadcast Channel (Physical Sidelink Broadcast Channel, PSBCH), etc., and the receiving module 220 is configured to receive PSCCH, PSSCH , PSDCH and PSBCH from another user device 20.

The configuration (setting) module 230 is configured to store various items of configuration (setting) information received from the base station 10 or the user equipment 20 via the receiving unit 220 in a storage device and read them from this storage device if necessary. The configuration (setting) module 230 is also configured to store predetermined configuration (setting) information. The content of said configuration (setting) information is, for example, communication configuration related to cells, communication configuration (setting) related to BWP, configuration (setting) related to transmission and reception using MIMO, configuration (setting) related to DRX , etc.

As described in the embodiment of the present invention, the control unit 240 is configured to perform communication using spatial multiplexing with multiple MIMO layers based on the communication configuration (settings) received from the base station 10. In addition, the control unit 240 is configured to control the activation or deactivation of cells. The control module 240 is also configured to control communications that use DRX. Functional elements in the control module 240 related to signal transmission may be contained in the transmission module 210, and functional elements in the control module 240 related to signal reception may be contained in the reception module 220.

(Hardware configuration)

The above functional diagrams used to describe embodiments of the present invention (FIGS. 17 and FIG. 18) show blocks of functional modules. These functional blocks (functional elements) are implemented by a freely selectable combination of hardware and software. The implementation method of each function block is not specifically limited. In other words, each functional block can be implemented by one device in which a plurality of elements are physically and/or logically connected to each other, or can be implemented by two or more devices, physically and/or logically separate, but at the same time physically and/or logically connected. (eg, wired and/or wireless). These functional blocks can be implemented by combining one or more of the devices described above with programs.

The functions include judgment, definition, calculation, processing, logical inference, research, search, verification, reception, transmission, information output, access, disambiguation, selection, fact-finding, comparison, assumption, assumption and assumption; broadcast, notification, message, forwarding, setting, reconfiguring, placement, display, assignment, etc.; the above list is not limiting. For example, a functional block (component) functioning for transmission is called a transmission module or transmitter. In any case, as mentioned above, the implementation method is not specifically limited.

For example, base station 10, user device 20, or the like. according to an embodiment of the present invention may be implemented as a computer capable of implementing the radio communication method illustrated by the embodiment of the present invention. Fig. 19 shows an example of a hardware configuration of a base station 10 or a user equipment 20 according to an embodiment of the present invention. Both base station 10 and user device 20 may physically be a computer, including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and so on.

It should be noted that in the following description, the term "device" may be understood as "circuit", "module", and the like. In the hardware configurations of the base station 10 and the user device 20, the modules shown in the drawing may contain one or more modules, or some of these modules may not be included.

Each function of the base station 10 and the user device 20 is implemented by instructing the predetermined hardware, such as the processor 1001, the storage device 1002, or the like, to perform software (program) reading, by instructing the processor 1001 to perform calculations, by instructing the processor 1001 control the communication performed by the communication device 1004 and the reading and/or writing of data by the storage device 1002 and the auxiliary storage device 1003.

The processor 1001 controls the entire computer by, for example, controlling the operating system. The processor 1001 may include a central processing unit (CPU) including an interface to a peripheral device, a control device, a computing device, a register, and so on. For example, the control unit 140, control unit 240, and the like described above may be implemented by the processor 1001.

In addition, the processor 1001 is configured to read a program (program code), program module, or data from the auxiliary storage device 1003 and/or from the communication device 1004, and to perform various operations in accordance with the program, program module, or data. As said program, a program that causes the computer to perform at least part of the operations according to the above-described embodiment of the present invention is used. For example, in base station 10 shown in FIG. 17, control module 140 may be implemented by control programs stored in memory 1002 and executed by processor 1001. In addition, for example, by control programs stored in memory 1002 and executed by processor 1001, control module 240 of user device 20 may be implemented. shown in FIG. 18. Various operations have been described here as being performed by a single processor 1001. However, these operations may be performed by two or more processors 1001 simultaneously or sequentially. Processor 1001 may be implemented with one or more integrated circuits. It should be noted that said program may be transmitted from the network via a communication line.

The storage device 1002 is a machine-readable, writable storage medium and may comprise at least one of Read Only Memory (ROM), Read Only Memory (EPROM), Electrically Erasable Read Only Memory (EEPROM), Random Access Memory (RAM). RAM), etc. The storage device 1002 may be referred to as a register, cache, main memory, and so on. The storage device 1002 is configured to store programs (program codes), program modules, or the like, which can be executed to perform communication operations according to an embodiment of the present invention.

The auxiliary storage device 1003 is a machine-readable storage medium with the ability to record, and may contain at least one of, for example, an optical disk, for example, a compact disk (English Compact Disc ROM, CD-ROM), a hard disk ( Hard Disk Drive, HDD), floppy disk, magneto-optical disk (e.g. CD, digital multifunction disc, Blu-ray Disc (registered trademark), smart card, flash memory (e.g. memory card, removable storage , removable disk), floppy disk (registered trademark), magnetic tape, etc. The above writable storage medium may be a database containing storage device 1002 and/or auxiliary storage device 1003, a server, or any other suitable storage medium.

The communications device 1004 is a hardware (transmitter and receiver) for communicating with computers via a wired and/or wireless network, and may be referred to as a network device, network controller, network card, communication module, and so on. The communication device 1004 may include a high frequency switch, an antenna switch, a filter, a frequency synthesizer, or the like. in order to implement, for example, frequency division duplex (FDD) and/or time division duplex (TDD). For example, a transmitting/receiving antenna, an amplifying module, a transmitting/receiving module, a transmission line interface, and the like. may be implemented by the communications device 1004. The transmit/receive module may be physically or logically divided into a transmit module and a receive module.

The input device 1005 is a device (eg, keyboard, mouse, microphone, switch, button, sensor) for receiving information from outside. The output device 1006 is an output means (eg, display, acoustic emitter, LED) capable of outputting some information. It should be appreciated that the input device 1005 and the output device 1006 may be combined into one device (eg, a touch panel).

Further, devices including processor 1001, storage device 1002, etc. interconnected bus 1007 used for information exchange. Bus 1007 may be a single bus or may contain different buses between these devices.

Further, both the base station 10 and the user device 20 may contain hardware, for example, a microprocessor, a digital signal processor (English Digital Signal Processor, DSP), a specialized integrated circuit (English Application Specific Integrated Circuit, ASIC), programmable logic device (English Programmable Logic Device, PLD), programmable matrix of logical elements (English Field Programmable Gate Array, FPGA), etc., and each functional block can be fully or partially implemented by means of these hardware. For example, processor 1001 may be implemented by at least one of these hardware elements.

(Summary overview of implementations)

According to the above, according to an implementation of the present invention, there is provided a user equipment, comprising: a receiving module, configured to receive a first number of MIMO layers and a second number of MIMO layers from a base station; a control module, configured to select the first number of MIMO levels or the second number of MIMO levels depending on the communication state; and a communication module configured to communicate using the selected number of MIMO layers, the first number of MIMO layers configured for the default BWP (part of the frequency band) or the original BWP, and the second number of MIMO layers configured for each cell.

The user equipment 20 of the above configuration is capable of changing the number of MIMO layers to be used according to the communication state. For example, when the BWP technology is used to reduce the bandwidth used by the user equipment 20, reducing the number of MIMO layers can achieve the effect of reducing power consumption. In other words, in a wireless communication system, communication efficiency can be improved by ensuring that the user equipment uses an adequate number of MIMO layers.

The control module is configured to select a first number of MIMO levels when the SCell (secondary cell) has transitioned to the deactivated state and a second number of MIMO levels when the SCell has transitioned to the activated state. According to the above configuration, when the SCell has transitioned to the deactivated state, the user equipment 20 uses the number of MIMO layers configured for the default BWP or the initial BWP, and when the SCell has transitioned to the activated state, the user equipment 20 uses the number of MIMO layers configured for each cell.

The control module is configured to select a first number of MIMO levels when the serving cell's DRX inactivity timer has expired and a second number of MIMO levels when a new reception or transmission is initiated by the Physical Downlink Control Channel (PDCCH). According to the above configuration, the user equipment 20 is configured to use the number of MIMO layers configured for the default or initial BWP when the DRX inactivity timer expires, and the number of MIMO layers configured for each cell when a new reception or transmission occurs over the PDCCH.

The first number of MIMO levels may be less than the second number of MIMO levels. In the above configuration, when using the BWP technology to reduce the bandwidth used by the user equipment 20, the effect of reducing power consumption by reducing the number of MIMO layers can be obtained.

Further, according to an embodiment of the present invention, a base station is provided, comprising: a transmission module configured to transmit a first number of MIMO layers and a second number of MIMO layers to a user equipment; a control module, configured to select the first number of MIMO levels or the second number of MIMO levels depending on the communication state; and a communication module configured to communicate using the selected number of MIMO layers, wherein the first number of MIMO layers is configured for the default BWP or the original BWP and the second number of MIMO layers is configured for each cell.

The user equipment 20 of the above configuration can change the number of MIMO layers to be used according to the communication state. For example, when the BWP technology is used to reduce the bandwidth used by the user equipment 20, reducing the number of MIMO layers can achieve the effect of reducing power consumption. In other words, in a wireless communication system, communication efficiency can be improved by ensuring that the user equipment uses an adequate number of MIMO layers.

(Supplement to implementation option)

One or more embodiments have been described above. However, the present invention is not limited to the above embodiments. It will be appreciated by those skilled in the art that various modifications, changes, alternatives, substitutions, and so on, are possible in these embodiments. To facilitate understanding of the present invention, specific meanings are used in the description. However, unless otherwise noted, these values are merely examples and other suitable values may be used instead. The division into the elements described above is not essential to the present invention. What is described as two or more elements can be used as a combination if necessary, and what is described as one element can be properly applied to another element (unless there is a conflict). The boundaries of functional modules or processing modules in functional diagrams do not necessarily correspond to the boundaries of physical components. The operations of the plurality of functional modules may be physically performed by one part, and the operation of one functional module may be physically performed by the plurality of parts. The order in the sequences and block diagrams described in an embodiment of the present invention may be changed if there is no conflict. For convenience of description, base station 10 and user equipment 20 have been described using functional diagrams. However, these devices may be implemented in hardware, software, or a combination of hardware and software. The program executed by the processor contained in the base station 10 according to the embodiment of the present invention and the program executed by the processor contained in the user equipment 20 according to the embodiment of the present invention may be stored in random access memory (RAM), flash memory, ROM memory (ROM), read only memory (EPROM), electrically erasable read only memory (EEPROM), register, hard disk, removable disk, CD, database, server, or any other suitable recording medium.

Further, the indication of information (transmission, message) can be performed not only in the ways described in the aspect/implementation of the present disclosure, but also in a different way. For example, the transmission of information can be performed through physical layer signaling (for example, through downlink control information (eng. Downlink Control Information, DCI), uplink control information (eng. Uplink Control Information, UCI)) upper layer signaling (for example, RRC layer signaling , MAC level signaling, broadcast information (Master Information Block, MIB), System Information Block (SIB))), other signals, or combinations thereof. The RRC signaling may be referred to as an RRC message. Said RRC signaling may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.

Each aspect/implementation described in this disclosure can be applied to at least one of a system using LTE, LTE-Advanced (LTE-Advanced, LTE-A), SUPER 3G, IMT-Advanced, systems fourth generation mobile communications (4G), fifth generation mobile communications (5G), Future Radio Access (FRA), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, ultra-wideband systems mobile communication (Ultra Mobile Broadband, UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (Wi-MAX (registered trademark)), IEEE 802.20, short distance communication systems using broadband signals Ultra-Wide Band (UWB), Bluetooth (registered trademark), other suitable system, and a next-generation system enhanced from these systems. In addition, a combination of multiple systems may be used (eg, at least one of LTE and LTE-A in a c5G combination, etc.).

Order of processing steps, sequences, etc. aspect/implementation described in this document may be changed if there is no conflict. For example, in the method described herein, the elements of the various steps are presented in the order proposed as an example. This order is not limited to the specific order shown.

The specific operations that are herein contemplated to be performed by the base station 10 may, in some cases, be performed by the superior node. Obviously, in a network containing one or more network nodes, including base station 10, various operations performed to communicate with user device 20 may be performed by base station 10 and/or another network node other than base station 10 ( for example, but not limited to an MME or S-GW node). As described above, a case has been described in which there is one network node other than the base station 10. However, a combination of many other network nodes (eg, MME and S-GW) may be considered.

The information or signals described in this disclosure may be transmitted from an upper layer (or lower layer) to a lower layer (or higher layer). This information or signals may be received or transmitted through a plurality of network nodes.

Information received or transmitted may be stored in a specific location (eg, memory) or may be stored using control tables. Information received or transmitted may be overwritten, updated or supplemented. The transmitted information may be deleted. The received information can be transmitted to another device.

A decision or determination in an embodiment of the present invention may be performed on a value (0 or 1) expressed by a single bit, on a Boolean value (true or false), or by comparison with a numeric value (eg, comparison with a predetermined value).

Software, whether called "program", "internal program", "middleware", "microcode", "hardware description language" or otherwise, should be understood in a broad sense, covering instructions, sets instructions, codes, code segments, program codes, programs, subroutines, program modules, applications, software applications, software packages, objects, executable files, threads of execution, procedures, functions, etc.

Program, instructions, information, etc. can be transmitted and received via the transmission medium. For example, when a program is transmitted from a website, server, or other remote source using wired media (such as coaxial cable, fiber optic cable, twisted-pair cable, Digital Subscriber Line (DSL)) and /or wireless media (eg, infrared radiation, microwaves, or the like), at least one of these wired media and wireless media is included in the definition of the transmission medium.

The information, signal, and the like described herein may be represented using one of a variety of different technologies. For example, data, instruction, command, information, signal, bit, symbol, code sequence (chip), or the like, appearing in this disclosure may be represented by voltage, electric current, electromagnetic waves, magnetic fields, magnetic particle, optical fields, a photon, or a combination of the above.

It should be noted that a term used in this document and/or a term necessary for the understanding of this document may be replaced by a term having the same or similar semantic content. For example, the channel and/or symbol may be a signal (signaling). In addition, the signal may be a message. Further, the elementary carrier (CCH) may be referred to as a frequency carrier, a cell, a frequency carrier, or the like.

In the present disclosure, the terms "system" and "network" are used interchangeably.

The information, parameters, and the like explained in the present disclosure may be expressed using absolute values, relative values with respect to predetermined values, or using other relevant information. For example, the radio resource may be indicated by an index.

The names used for the above parameters are not used as restrictions. In addition, the mathematical expressions that use these parameters may differ from those expressly disclosed in this disclosure. Since the various channels (eg, PUCCH, PDCCH, or the like) and information elements may be referred to by any suitable names, the different names assigned to these various channels and information elements are not used as limitations.

In this disclosure, the terms "base station" (BS), "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "point transmission", "receiving point", "transmitting/receiving point", "cell", "sector", "group of cells", "carrier", "elementary carrier", etc. can be used interchangeably. A base station may be referred to as a macro cell, small cell, femto cell, pico cell, and the like.

The base station may serve (form) one or more (eg, three) cells. When a base station serves many cells, the entire coverage area of that base station can be divided into many smaller areas, in each of which communication services can be provided by a subsystem of the base station (for example, a small indoor base station or a remote radio unit (English Remote Radio Head). , RRH)). The term "cell" or "sector" refers to part or all of the coverage area of at least one of a base station and a base station subsystem providing communication services in that coverage area.

In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", "terminal", etc. can be used interchangeably.

A person skilled in the art may refer to a mobile station as a 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, handset, user agent, mobile client, client, and some other suitable terms.

At least one of the base station and mobile station may be referred to as a transmitter, a receiver, a communication device, or the like. At least one of the base station and the mobile station may be a device installed in the mobile station, the mobile station itself, or the like. A mobile station can be a vehicle (for example, a car, an airplane, etc.), a mobile object that moves without a pilot on board (for example, a drone, an autonomous vehicle, etc.) or a robot (of a type controlled by a person or unmanned type). At least one of the base station and mobile station may include a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (LOT) device, such as a sensor.

Further, the base station in the present disclosure can be interpreted as a user terminal. For example, each aspect/embodiment of the present disclosure may, instead of a configuration in which communication is between a base station and a user terminal, be applied to a configuration in which communication is between a plurality of user terminals 20 (which may be referred to as device-to-device communication). to-Device, D2D), communication between a vehicle and a wide range of objects (English V2X, Vehicle-to-Everything), etc.). In this case, the above-described function of the base station 10 may be performed by the user equipment 20. The expressions "uplink" and "downlink" can also be replaced by expressions corresponding to direct communication between terminals (eg, "relating to direct communication"). For example, terms such as uplink, downlink, or the like. can be interpreted as a direct channel.

In addition, in the present disclosure, a user terminal can be understood as a base station. In this case, the above-described user terminal function may be provided by the base station.

In this document, the content of the term "definition" can be a variety of actions or operations. For example, the content of the term “definition” may include “judgment”, “calculation”, “calculation”, “processing”, “inference”, “research”, “search, search, query” (for example, search in a table, database data or other data structures) or "fact finding". In addition, the term "definition" may include "receiving" (for example, receiving information), "transmitting" (for example, transmitting information), "input", "output" or "access" (for example, accessing data in memory ). Further, the content of the term "definition" may include "disambiguation", "selection", "selection", "establishment", "comparison", etc. In other words, "determination" can be understood as a certain action or operation. The term "decision making" can be interpreted as "speculation", "expectation" or "consideration", etc.

The term "connected" or "connected" or any variant thereof means any direct or indirect connection or connection between two or more elements, including the presence of one or more intermediate elements between two elements that are "connected" or "connected" to each other. . The relationship or connection between these elements may be physical, logical, or a combination of both. For example, "connection" can be understood as "access". In the present disclosure, two elements may be "connected" or "coupled" together using at least one of one or more conductors, cables, and printed electrical connections, and, as a few non-limiting and non-exclusive examples, using electromagnetic energy having wavelengths in the radio frequency range, in the microwave range and in the light range (both visible and invisible).

The Reference Signal may be abbreviated as RS and, depending on the applicable standard, may also be referred to as a pilot. The expression "based on" as used in this disclosure does not mean "on the basis of" unless otherwise indicated. In other words, the phrase "based on" means both "based on only" and "based on at least".

Any reference to elements using designations such as "first" or "second" in this disclosure does not generally limit the number or order of those elements. Such designations may be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, the mention of the first and second elements does not imply that only two elements can be used, or that the first element must in any way precede the second element.

The term "means" in the configuration of each of the devices described above may be replaced by the term "parts", "circuits", "devices", etc.

When the terms "comprise", "comprising", and variations thereof are used in this disclosure, these terms are to be understood in an inclusive sense, analogous to the term "comprising". The union "or" in this document and in the claims is not to be understood as meaning an exclusive disjunction.

A radio frame may contain one or more frames in the time domain. Each of these one or more frames in the time domain may be referred to as a subframe. This subframe may contain one or more slots in the time domain. This subframe may have a fixed time duration (eg, 1 ms) independent of numerology.

Numerology may refer to a communication parameter applied to at least one of the transmission and reception of a signal or channel. For example, numerology can indicate at least one of, for example, subcarrier spacing (English SubCarrier Spacing, SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (English Transmission Time Interval, TTI) , number of symbols per TTI, radio frame configuration, specific filtering processing performed by the transceiver in the frequency domain, and specific windowing performed by the transceiver in the time domain.

A slot in the time domain may contain one or more symbols, for example, Orthogonal Frequency Division Multiplexing (OFDM), Single Carrier Frequency Division Multiple Access, SC-FDMA), etc. The slot can be a temporary element depending on numerology.

A slot may contain a plurality of minislots. Each minislot in the time domain may contain one or more symbols. A minislot may be referred to as a subslot. A minislot can contain fewer characters than a slot. PDSCH (or PUSCH) transmission in time bins larger than a minislot may be referred to as PDSCH Mapping Type A (PUSCH). PDSCH (or PUSCH) transmission using a minislot may be referred to as PDSCH Map Type B (PUSCH).

The radio frame, subframe, slot, minislot, and symbol are temporary elements for signaling. Different terms may be used for radio frame, subframe, slot, minislot, and symbol, respectively.

A transmission time interval (TTI) may be referred to as, for example, one subframe, multiple consecutive subframes, one slot, or one minislot. In other words, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, may be a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. Note that an element representing a TTI may not be referred to as a subframe, but as a slot, mini-slot, or the like.

TTI denotes, for example, the smallest time element for scheduling when performing wireless communication. For example, in the LTE system, the base station for each user device 20 schedules the allocation of radio resources (eg, bandwidth, transmission power, etc., allowed for use by each user device 20) in units of TTI. The definition of TTI is not limited to this.

The TTI may be a transmission time element, such as a channel-coded data packet (transport block), code block, codeword, or the like, or may be a processing element, such as in link scheduling or adaptation. It should be appreciated that when a TTI is provided, the time interval (eg, number of symbols) during which the actual mapping of a transport block, code block, codeword, or the like is performed may be shorter than this TTI.

Note that when a TTI is referred to as one slot or one mini-slot, the minimum time element for scheduling may be one or more TTIs (ie, one or more slots or one or more mini-slots). Further, the number of slots (number of mini-slots) constituting this minimum scheduling time element can be controllable.

A TTI with a time duration of 1 ms may be referred to as a regular TTI (TTI in LTE versions 8-12), long TTI, regular subframe, long subframe, slot, etc. A TTI that is shorter than a regular TTI may be called short TTI, short TTI, partial TTI (or fractional TTI), shortened subframe, short subframe, mini-slot, sub-slot, or the like.

Note that a long TTI (eg, normal TTI, subframe, etc.) may be replaced by a TTI with a time duration greater than 1 ms, and a short TTI (eg, abbreviated TTI) may be replaced by a TTI shorter than the long TTI. and more than 1 ms.

A resource block (RB) is a resource allocation element in the time domain and in the frequency domain, and may contain one or more subcarriers in series in the frequency domain. The number of subcarriers contained in a resource block may be the same regardless of the numerology, and may be 12, for example. The number of subcarriers contained in a resource block may be determined based on the numerology.

Further, the time domain of the resource block may contain one or more symbols, which may be equal in length to one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may contain one or more resource blocks.

It should be noted that one or more resource blocks can be called a Physical Resource Block (PRB), a Sub-Carrier Group (SCG), a Resource Element Group (REG), a pair of PRBs, a pair of RBs, and the like.

Further, the resource block may contain one or more resource elements (English Resource Element, RE). One resource element may be, for example, a radio resource region formed by one subcarrier and one symbol.

A Bandwidth Part (BWP) (which may also be called a partial band, etc.) may be a subset of consecutive uninterrupted common resource blocks (common RBs) for a given numerology on a particular carrier. In this case, the common RB may be indicated by the RB index with respect to the common reference point of that carrier. PR B may be defined in a given BWP and may be numbered within that BWP.

The BWP may include an uplink BWP (UL BWP) and a downlink BWP (DL BWP). One or more BWPs may be configured for a UE on a single carrier.

At least one of the configured BWPs may be activated, and the UE may assume that no signals/channels are transmitted or received outside of the active BWP. It should be noted that in this disclosure, the terms "cell" and "carrier" may be replaced by the term "BWP".

The radio frame, subframe, slot, minislot, and symbol configurations presented above are exemplary only. For example, various changes are possible regarding the number of subframes contained in a radio frame, the number of slots per subframe or radio frame, the number of minislots contained in a slot, the number of symbols and RBs contained in a slot or minislot, the number of subcarriers contained in a RB, the number of symbols in a TTI. , character duration, cyclic prefix (CPU) length, etc.

In the present disclosure, when an article is added to a noun as a result of translation, for example, "a", "an" and "the", it is understood that the noun following this article can also be understood in the plural.

In the present disclosure, the expression "A and B are different" may mean "A and B are different from each other." Note that the expression "A and B are different" can mean "both A and B are different from C". Terms such as "separated" or "combined" can be interpreted in the same way as the above-described term "different".

The aspect/implementation described herein may be used independently, in combination, or with shift according to operations. Further, reporting (transmission/notification) of predetermined information (for example, reporting (transmission/notification) about X) is not limited to explicit communication (transmission/notification) and may be performed by implicit communication (transmission/notification) (for example, by not reporting (non-transmission/notification) failure to notify) of this information).

Note that "deactivated state" in the present disclosure is an example of a deactivated state. "Activated state" is an example of an activated state. The transmission module 210 and the reception module 220 are examples of communication modules. The transmission module 110 or the reception module 120 are examples of communication modules.

The above is a detailed description of the present invention. The specialist should be clear that the present invention is not limited to one or more embodiments of the present invention described in this disclosure. Without departing from the spirit and scope of the present invention as defined by the claims, modifications, alternative solutions, substitutions, etc. are possible in the present invention. In other words, the descriptions in the present disclosure are for illustrative purposes only and should not be construed as limiting the present invention.

The present application is based on, and the benefit of priority thereof is claimed from, Japanese Patent Application No. 2018-214558, filed Nov. 15, 2018, the entire contents of which are hereby incorporated by reference.

[Description of reference symbols]

10 base station

110 transmission module

120 receiving module

130 tuning module

140 control module

20 user device

210 transmission module

220 receiving module

230 tuning module

240 control module

1001 processors

1002 storage device

1003 auxiliary storage device

1004 communication device

1005 input device

1006 output device.

Claims (10)

1. Terminal (20) containing: a receiving module (220) configured to receive a first number of Multiple Input Multiple Output (MIMO) communication layers configured for a portion of a frequency band (BWP) and a second number of MIMO layers configured for each cell from a base station (10), wherein the second number of MIMO levels is a parameter different from the first number of MIMO levels; And a control module (240) configured to control communication with the base station (10) using the first number of MIMO layers to reduce power consumption. 2. Terminal (20) according to claim 1, characterized in that the first number of MIMO levels is less than the second number of MIMO levels. 3. Base station (10), containing: a transmission module (110) configured to transmit a first number of Multiple Input Multiple Output (MIMO) communication layers configured for a portion of a frequency band (BWP) and a second number of MIMO layers configured for each cell to a terminal ( 20), wherein the second number of MIMO levels is a parameter different from the first number of MIMO levels; And a control module (140) configured to control communication with the terminal (20) using the first number of MIMO layers to reduce power consumption. 4. Communication method performed by the terminal (20), including: receiving a first number of multiple input multiple output (MIMO) communication layers configured for a portion of the frequency band (BWP) and a second number of MIMO layers configured for each cell from the base station (10), wherein the second number of layers MIMO is a parameter other than the first number of MIMO levels; And control communication with the base station (10) using the first number of MIMO layers to reduce power consumption.