WO2022153461A1

WO2022153461A1 - Terminal device and wireless communication method

Info

Publication number: WO2022153461A1
Application number: PCT/JP2021/001117
Authority: WO
Inventors: 雅伏木
Original assignee: ソフトバンク株式会社
Priority date: 2021-01-14
Filing date: 2021-01-14
Publication date: 2022-07-21
Also published as: JPWO2022153461A1

Abstract

A terminal device (10) in a mobile communication system that supports carrier aggregation comprises: an acquisition unit (11) that acquires the number of layers for each of a plurality of component carriers; and a transmission unit (17) that transmits, to a base station device, a first number of layers of a first band including a first number of component carriers and a second number of layers of a second band including a second number of component carriers, which is less than the first number, wherein when the first number of layers and the second number of layers satisfy a prescribed condition, the transmission unit (17) omits the transmission, to the base station device, of a third number of layers of a third band including a third number of component carriers, which is less than the first number and is more than the second number. Thus it is possible to provide wireless communication technology for improving the usage efficiency of wireless communication resources between the terminal device (10) and the base station device (50).

Description

Terminal device and wireless communication method

The present invention relates to a terminal device and a wireless communication method.

The 3GPP (Third Generation Partnership Project), an international standardization organization, is studying NR (New Radio), which is a new wireless access technology for 5th generation (5G: Fifth Generation) cellular communication systems. For NR, a technique for realizing a wide variety of services is being studied, as compared with LTE (Long Term Evolution) -Advanced, which is a fourth-generation cellular communication system. For example, in NR, eMBB (enhanced Mobile Broad Band) that realizes high-speed and large-capacity communication, URLLC (Ultra-Reliable and Low Latency Communication) that realizes ultra-high reliability and low-delay communication, and IoT (Internet of Things) devices Usage scenarios with different uses, such as mMTC (massive Machine Type Communication) that realizes multiple simultaneous connections, are defined as realization requirements.

By the way, in NR, antenna technology for improving the throughput of wireless communication is adopted. For example, in NR, wireless communication using millimeter waves is feasible. When wireless communication is executed using a relatively high frequency band such as millimeter waves, propagation loss and the like increase. In order to prevent such a problem, a technique (beamforming) for forming a beam having a relatively narrow beam width is known. Further, in NR, MIMO (Multiple Input Multiple Output), which is a technique in which transmission data is divided into a plurality of antennas and transmitted in parallel, is adopted, which is provided with a plurality of antennas on both the transmitting side and the receiving side. See Non-Patent Document 1).

Furthermore, in NR, carrier aggregation (CA: Carrier Aggregation), which is called a component carrier (CC) and can expand the bandwidth by, for example, aggregating a plurality of frequency bands of 20 MHz, is adopted. ing. Regarding this carrier aggregation, in the base station device, in order to set the MIMO layer of each component carrier at the time of carrier aggregation execution, a plurality of component carriers are used as terminal capability information (“UECapacity Information”) of the terminal device itself from the terminal device. Information on the number of MIMO layers is obtained for each (see Non-Patent Document 2).

As described above, in NR, at the start of connection, the base station device acquires information on the number of MIMO layers for each component carrier from the terminal device for all of the plurality of component carriers of carrier aggregation. That is, the terminal device needs to transmit a large amount of terminal capability information of the terminal device itself to the base station device. Therefore, the utilization efficiency of the wireless communication resource between the terminal device and the base station device may decrease.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a wireless communication technique for improving the utilization efficiency of wireless communication resources between a terminal device and a base station device.

The terminal device according to one aspect of the present invention is a terminal device in a mobile communication system corresponding to carrier aggregation, and includes an acquisition unit for acquiring the number of layers for each of a plurality of component carriers and a first number of component carriers. A transmission unit for transmitting the number of first layers of the first band and the number of second layers of the second band including the second number of component carriers less than the first number to the base station apparatus is provided. The transmitter includes a third number of component carriers, which is less than the first number and more than the second number when each of the number of the first layer and the number of the second layer satisfies a predetermined condition. Transmission of the third layer number of the third band to the base station apparatus is omitted.

The wireless communication method according to one aspect of the present invention is a wireless communication method used by a terminal device in a mobile communication system that supports carrier aggregation, and includes a step of acquiring the number of layers for each of a plurality of component carriers and a first number. The step of transmitting the number of first layers of the first band including the component carriers of the above and the number of second layers of the second band including the second number of component carriers less than the first number to the base station apparatus. The number of third layers is less than the number of the first layer and more than the number of the second layer when each of the number of the first layer and the number of the second layer satisfies a predetermined condition. Transmission to the base station apparatus of the third layer number of the third band including the component carrier of the above is omitted.

According to the present invention, it is possible to provide a wireless communication technique for improving the utilization efficiency of wireless communication resources between a terminal device and a base station device.

FIG. 1 is a configuration diagram showing an example of a schematic configuration of a mobile communication system according to an embodiment. FIG. 2 is a configuration diagram showing an example of the hardware configuration of the terminal device and the base station device in one embodiment. FIG. 3 is a configuration diagram showing an example of the functional block configuration of the terminal device according to the embodiment. FIG. 4 is a configuration diagram showing an example of a functional block configuration of the base station apparatus in one embodiment. FIG. 5 is a flowchart showing an example of MIMO layer setting processing at the time of carrier aggregation in the first embodiment. FIG. 6 is a conceptual diagram showing an example of a transmission process of terminal capability information (“UECapacity Information”) in the first embodiment. FIG. 7 is a flowchart showing an example of MIMO layer setting processing at the time of carrier aggregation in the second embodiment. FIG. 8 is a flowchart showing an example of MIMO layer setting processing at the time of carrier aggregation in the third embodiment. FIG. 9 is a conceptual diagram showing an example of a terminal capability information transmission process according to the third embodiment. FIG. 10 is a conceptual diagram showing another example of the transmission processing of the terminal capability information in one embodiment.

An embodiment of the present invention will be described below. In the description of the drawings below, the same or similar parts are represented by the same or similar reference numerals. However, the drawings are schematic. Therefore, the specific dimensions and the like should be determined in light of the following explanations. In addition, it goes without saying that the drawings include parts having different dimensional relationships and ratios from each other. Furthermore, the technical scope of the present invention should not be construed as limited to the embodiment.

With reference to FIG. 1, a schematic configuration of a mobile communication system corresponding to carrier aggregation (CA) in one embodiment will be described. Carrier aggregation CA processing refers to processing called component carrier (CC), in which the bandwidth can be expanded by aggregating a plurality of frequency bands of, for example, 20 MHz. FIG. 1 is a configuration diagram showing an example of a schematic configuration of a mobile communication system 100 according to an embodiment.

As shown in FIG. 1, the mobile communication system 100 includes a terminal device 10-1 to a terminal device 10-m, a base station device 50-1 to a base station device 50-n, and a core network device 90. It is composed. Note that FIG. 1 illustrates terminal devices 10-1 to 10-m as terminal devices in the m range (m is an integer of 2 or more). In the following description, when these m-unit terminal devices are described without distinction, a part of the reference numerals is omitted and the term "terminal device 10" is simply referred to. Further, FIG. 1 illustrates base station devices 50-1 to 50-n as n base station devices (n is an integer of 2 or more). In the following description, when these n base station devices are described without distinction, a part of the reference numerals is omitted, and the term "base station device 50" is simply referred to.

Here, the outline of the mobile communication system 100 according to the first embodiment of the present invention will be described. As described above, in NR, when the carrier aggregation (CA) is executed, the terminal device needs to transmit a lot of terminal capability information of the terminal device itself to the base station device. Therefore, the utilization efficiency of the wireless communication resource between the terminal device and the base station device may decrease.

As a method for improving the utilization efficiency of wireless communication resources between the terminal device and the base station device, for example, the fallback CA (for example, when a maximum of M CCs can be used in the CA, is smaller than M). A CA that uses N CCs, which is an integer number. M is an integer smaller than 5, for example.) There is a method of omitting a part of transmission of terminal capability information.

FIG. 10 is a conceptual diagram showing an example of a terminal capability information transmission process in one embodiment. In particular, FIG. 10 shows from the terminal device to the base station device when the terminal device mounts eight antenna paths (8RF path) in the Intra band 4CC CA that can use up to four CCs in the Intra band CA. It is a figure which shows an example of transmitting the terminal ability information with respect to. For example, if the terminal device supports the same functions as the highest-level Intra band 4CC CA for the fallback CA (for example, Intra band 3CC CA and Intra band 2CC CA in FIG. 10), the terminal capability of the fallback CA There is a method that makes it possible to omit the transmission of information. The highest Intra band 4CC CA has CC # 0 (2x2), CC # 1 (2x2), CC # 2 (2x2) and CC # 2 (2x2) with the number of MIMO layers "2" in the frequency band. Since CC # 3 (2x2) is included, transmission of information regarding the number of MIMO layers of the fallback CA having the same CC (2x2) combination is omitted. That is, the terminal device can omit the transmission of information related to CC # 0 (2 × 2), CC # 1 (2 × 2), and CC # 2 (2 × 2) in the fallback CA (Intra band 3CC CA). Is. Further, in the fallback CA (Intra band 2CC CA), the terminal device can omit the transmission of information regarding CC # 0 (2 × 2) and CC # 1 (2 × 2).

However, as shown in FIG. 10, regarding the Intra band 3CC CA, for example, regarding the information regarding the number of MIMO layers of CC # 0 (4 × 4), CC # 1 (2 × 2) and CC # 2 (2 × 2). , Need to be sent. That is, in the example of FIG. 10, in the Intra band 3CC CA, CC # 0 (4), which is a MIMO layer number “4” different from the MIMO layer number “2” common to each CC in the highest Intra band 4CC CA. × 4) is included. Therefore, it cannot be said that the same function as the highest-level Intra band 4CC CA is supported in the Intra band 3CC CA, so that the terminal device is CC # 0 (4 × 4), CC # in the Intra band 3CC CA. Information about the number of MIMO layers of 1 (2x2) and CC # 2 (2x2) must be transmitted to the base station apparatus. Similarly, since the Intra band 2CC CA includes CC # 0 (4 × 4) and CC # 1 (4 × 4), it can be said that the same functions as the highest-level Intra band 4CC CA are supported. Therefore, the terminal device must transmit information regarding the number of MIMO layers of CC # 0 (4 × 4) and CC # 1 (4 × 4) in the Intra band 2CC CA to the base station device.

In the above method, transmission of some information regarding the number of MIMO layers of the fallback CA can be omitted. That is, it is not sufficient as a method for improving the utilization efficiency of wireless communication resources between the terminal device and the base station device.

Therefore, in the mobile communication system according to the embodiment of the present invention, the terminal device has a frequency band (first band) of the highest Intra band 4CC CA including four (first number) component carriers (CC). It is based on the number of first layers and the number of second layers in the lowest 1CC frequency band (second band) including one (second number) CC less than four (first number). Send to the station equipment. When the number of first layers and the number of second layers satisfy predetermined conditions, the number of terminal devices is less than 4 (first number) and more than 1 (second number), or 2 or more. Transmission of the frequency band (third band) of the fallback CA including three (third number) CCs to the base station apparatus of the third layer number is omitted.

Therefore, the terminal device can largely omit the terminal capability information for transmitting to the base station device. Therefore, it is possible to improve the utilization efficiency of the wireless communication resource between the terminal device and the base station device.

Returning to FIG. 1, the mobile communication system 100 is, for example, a mobile communication system for NR. The present invention is applicable to any mobile communication system including at least a terminal device and a base station device, and is not limited to those targeting NR. For example, the present invention is also applicable to LTE and LTE-Advanced. It can also be applied to a mobile communication system that uses NR as a part of the mobile communication system. Hereinafter, LTE and LTE-Advanced are also referred to as E-UTRA (Evolved Universal Terrestrial Radio Access), but their meanings are the same. The area (cover area) formed by the base station apparatus is called a cell, and E-UTRA and NR are cellular communication systems constructed by a plurality of cells. Either TDD (Time Division Duplex) or FDD (Frequency Division Duplex) may be applied to the mobile communication system according to the present embodiment, and different methods may be applied to each cell.

The terminal device 10-1 to the terminal device 10-m are wirelessly connected to any one of the base station device 50-1 to the base station device 50-n, respectively. Further, each of the terminal devices 10-1 to the terminal device 10-m may be wirelessly connected to two or more of the base station devices 50-1 to the base station device 50-n at the same time. E-UTRA or NR can be used for the base station apparatus 50-1 to the base station apparatus 50-n, respectively. For example, the base station apparatus 50-1 may use NR and the base station apparatus 50n may use E-UTRA, and vice versa. The base station device in E-UTRA is called eNB (evolved NodeB), and the base station device in NR is called gNB (g-NodeB).

In the following, when the term "base station device" is used, it means that both eNB and gNB are included. Further, the terminal device in E-UTRA and NR is referred to as UE (User Equipment). The base station device gNB in the NR may be connected to the terminal device by using a part (BWP: Carrier bandwidth part) of the frequency band used by the base station device gNB. Hereinafter, when the term “cell” is used, BWP is included.

Examples of the communication terminal 10 include portable information communication devices such as IoT devices, smartphones, mobile phones, personal digital assistants (PDAs), tablet terminals, portable game machines, portable music players, and wearable terminals. The terminal device 10 may be connected to the base station device 50 in cell units, for example, and may be connected using a plurality of cells, for example, carrier aggregation. When the terminal device 10 is connected via a plurality of base station devices, that is, in the case of dual connectivity, the base station device to be initially connected is the master node (MN: MasterNode), and the base station device to be additionally connected is It is called a secondary node (SN: Secondary Node). The base station devices are connected by a base station interface. Further, the base station device 50 and the core network device 90 are connected by a core interface. The base station interface is used for exchanging control signals necessary for handover and cooperative operation between base station devices.

The core network device 90 has, for example, a base station device 50 under its control, and mainly handles load control between base station devices, call (paging) of the terminal device 10, and movement control such as location registration. The NR defines AMF (Access and Mobility Management Function) for managing mobility and SMF (Session Management Function) for managing sessions as a function group of the control plane (C-plane) in the core network device 90. .. E-UTRA defines MME (Mobility Management Entity) corresponding to AMF.

Note that FIG. 1 shows an example in which the core network device 90 is composed of one device, but the present invention is not limited to this. For example, the core network device may include a server, a gateway, and the like, and may be composed of a plurality of devices.

The terminal device 10 and the base station device 50 transmit and receive RRC messages in the radio resource control (RRC: Radio Resource Control) layer, and proceed with session processing (also referred to as a connection sequence). As the session processing proceeds, the terminal device 10 changes from the idle state (RRC Idle) to the connected state (RRC Connected) to the base station device 50. The idle state corresponds to the standby state of the terminal device 10.

Further, the terminal device 10 and the base station device 50 transmit and receive a MAC control element (MAC CE: MAC Control Element) in the medium access control (MAC: Medium Access Control) layer. The RRC message is transmitted as an RRC PDU (Protocol Data Unit), and as the mapped logical channels, a common control channel (CCCH: Common Control Channel), an individual control channel (DCCH: Dedicated Control Channel), and a paging control channel (PCCH:). Paging Control Channel), Broadcast Control Channel (BCCH: Broadcast Control Channel), or Multicast Control Channel (MCCH: Multicast Control Channel) is used. The MAC CE is transmitted as a MAC PDU (or MAC sub PDU). A MAC subPDU is equivalent to a service data unit (SDU: Service Data Unit) in the MAC layer plus, for example, an 8-bit header, and a MAC PDU includes one or more MAC subPDUs.

The physical channels and physical signals related to this embodiment will be described. Among the physical channels according to the embodiment of the present invention, a physical broadcast channel (PBCH: Physical Broadcast Channel), a primary synchronization signal (PSS: Primary Synchronization Signal), a secondary synchronization signal (SSS: Secondary Synchronization Signal), and a physical random access channel (SSS: Secondary Synchronization Signal). The PRACH: Physical Random Access Channel) and the physical downlink control channel (PDCCH: Physical Downlink Control Channel) will be described below. In the mobile communication system according to the embodiment, a physical uplink control channel (PUCCH: Physical Uplink Control Channel), a physical downlink shared channel (PDSCH: Physical Downlink Shared Channel), and a physical uplink shared channel (PUSCH: Physical) are also used. Uplink Shared Channel), scheduling reference signal (SRS: Scheduling Reference Signal), and demodulation reference signal (DMRS: Demodulation Reference Signal) exist at least, but detailed description will be omitted.

<Physical notification channel (PBCH)>
The physical broadcast channel (PBCH) is transmitted from the base station device 50 to the terminal device 10 and is used to notify a common parameter (system information) in a cell under the base station device 50. System information is further classified into a master information block (MIB: Master Information Block) and a system information block (SIB: System Information Block). The system information block is further subdivided into SIB1, SIB2, ..., And transmitted. The system information includes information necessary for connecting to the cell. For example, the MIB includes information such as a system frame number and information indicating whether or not to camp on the cell. Further, SIB1 contains parameters for calculating cell quality (cell selection parameters), cell-common channel information (random access control information, PUCCH control information, PUSCH control information), scheduling information of other system information, and the like. include. The physical broadcast channel (PBCH) is a synchronization signal block (SSB: Synchronization Signal Block (or SS / PBSH)), which is a set with a synchronization signal composed of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). Is transmitted periodically. By receiving the synchronization signal block (SSB), the terminal device 10 can measure the signal quality of the cell in addition to acquiring the cell identifier (cell ID) information and the reception timing.

The system information notified by the physical notification channel (PBCH) or the like is also called "system notification information" or "notification information". Further, when camping on a cell, the terminal device 10 completes cell selection and / or cell reselection, and the terminal device 10 selects a cell for monitoring system notification information and paging information. It means to be in a state of being in a state of being. The terminal device 10 establishes the above-mentioned RRC connection with the base station device 50 forming the camp-on cell.

<Primary Sync Signal (PSS)>
The primary synchronization signal (PSS) is used by the terminal device 10 to synchronize with the reception symbol timing and frequency of the downlink signal of the base station device 50. The primary synchronization signal (PSS) is a signal that the terminal device 10 first attempts to detect in a procedure for detecting a cell of the base station device 50 (hereinafter, also referred to as a “cell search procedure”). As the primary synchronization signal (PSS), three types of signals "0" to "2" are repeatedly used based on the physical cell ID. The physical cell ID is a physical cell identifier, and 504 IDs are used in E-UTRA and 1008 IDs are used in NR.

<Secondary sync signal (SSS)>
The secondary synchronization signal (SSS) is used by the terminal device 10 to detect the physical ID of the base station device 50. Specifically, the secondary synchronization signal (SSS) is a signal for the terminal device 10 to detect the physical cell ID in the cell search procedure. As the secondary synchronization signal (SSS), 168 signals from "0" to "167" are repeatedly used in E-UTRA, and 336 signals from "0" to "335" are repeatedly used in NR based on the physical cell ID. ..

<Physical Random Access Channel (PRACH)>
The physical random access channel (PRACH) is used by the terminal device 10 to transmit a random access preamble to the base station device 50. The physical random access channel (PRACH) is generally used in a state where uplink synchronization has not been established between the terminal device 10 and the base station device 50, and is used for transmission timing adjustment information (timing advance) and uplink radio. Used for resource requests. Information indicating a radio resource capable of transmitting a random access preamble is transmitted to a terminal using broadcast information or an RRC message.

<Physical downlink control channel (PDCCH)>
The physical downlink control channel (PDCCH) is transmitted from the base station apparatus 50 to notify the terminal apparatus 10 of the downlink control information (DCI). The downlink control information includes uplink radio resource information (uplink grant (UL grant)) that can be used by the terminal device 10 or downlink radio resource information (downlink grant (DL grant)). The downlink grant is information indicating the scheduling of the physical downlink shared data channel (PDSCH). The uplink grant is information indicating the scheduling of the physical uplink shared channel (PUSCH). When the physical downlink control channel (PDCCH) is sent in response to a random access preamble, the physical downlink shared data channel (PDSCH) indicated by the physical downlink control channel (PDCCH) is a random access response and is a random access preamble. Index information, transmission timing adjustment information, uplink grant, etc. are included.

<Hardware configuration>
The hardware configuration of the terminal device and the base station device according to the first embodiment will be described with reference to FIG. FIG. 2 is a configuration diagram showing an example of the hardware configuration of the terminal device 10 and the base station device 50.

As shown in FIG. 2, the terminal device 10 and the base station device 50 each include, for example, a processor 21, a memory 22, a storage device 23, a communication device 24, an input device 25, an output device 26, an antenna 27, and a sensor 29, respectively. Be prepared.

The processor 21 is configured to control the operation of each part of the terminal device 10 or the base station device 50. The processor 21 includes, for example, a CPU (Central Processing Unit), a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and a SoC (System-on-a). -chip) and other integrated circuits are included.

The memory 22 and the storage device 23 are each configured to store programs, data, and the like. The memory 22 is composed of, for example, a ROM (ReadOnlyMemory), an EPROM (ErasableProgrammableROM), an EEPROM (ElectricallyErasableProgrammableROM), and / or a RAM (RandomAccessMemory). The storage device 23 is composed of, for example, storage such as an HDD (Hard Disk Drive), an SSD (Solid State Drive) and / or an eMMC (embedded MultiMediaCard).

The communication device 24 is configured to communicate via a wired and / or wireless network. The communication device 24 includes, for example, a network card, a communication module, and the like. Further, the communication device 24 may include an amplifier, an RF (Radio Frequency) device that performs processing related to radio signals, and a BB (BaseBand) device that performs baseband signal processing.

The RF device, for example, performs D / A (Digital to Analog) conversion, modulation, frequency conversion, power amplification, etc. on the digital baseband signal received from the BB device to generate a wireless signal transmitted from the antenna 27. Generate. Further, the RF device generates a digital baseband signal by performing frequency conversion, demodulation, A / D (Analog to Digital) conversion, etc. on the radio signal received from the antenna 27 and transmits it to the BB device. The BB apparatus performs a process of converting a digital baseband signal into an IP packet and a process of converting an IP packet into a digital baseband signal.

The input device 25 is configured so that information can be input by a user operation. The input device 25 includes, for example, a keyboard, a touch panel, a mouse, and / or a microphone.

The output device 26 is configured to output information. The output device 26 includes, for example, a liquid crystal display, an EL (Electro Luminescence) display, a display device such as a plasma display, and / or a speaker.

The antenna 27 is configured to be able to radiate (radiate) and receive radio waves (electromagnetic waves) in one or a plurality of predetermined frequency bands. The antenna 27 may be a directional antenna. The gain of the directional antenna 27 differs depending on the orientation of the antenna. The antenna 27 may have no directivity, that is, one having omnidirectionality. The omnidirectional antenna 27 has approximately the same gain from all 360 degrees directions in the horizontal plane, in the vertical plane, or both in the horizontal plane and in the non-horizontal plane and in the vertical plane.

The number of antennas 27 is not limited to one. The terminal device 10 and the base station device 50 may include a plurality of antennas. When the terminal device 10 and the base station device 50 include a plurality of antennas, they may be divided into, for example, a transmitting antenna and a receiving antenna. Further, when a plurality of antennas are divided into a transmitting antenna and a receiving antenna, at least one of them may include a plurality of antennas. When the terminal device 10 and the base station device 50 are provided with a plurality of transmission / reception antennas or transmission antennas, a beamforming technique described later can be used.

The sensor 29 included in the terminal device 10 includes a sensor that detects the position, orientation, and acceleration of the terminal device 10. The sensor 29 included in the terminal device 10 includes, for example, at least one sensor such as a GPS (Global Positioning System) sensor, a gyro sensor, and an acceleration sensor. On the other hand, the sensor 29 included in the base station device 50 may include, for example, a sensor that detects environmental information such as temperature, humidity, weather, or seismic intensity in the base station device 50.

<Functional block configuration>
(Terminal device)
The functional block configuration of the terminal device according to the first embodiment will be described with reference to FIG. FIG. 3 is a configuration diagram showing an example of a functional block configuration of the terminal device 10. Note that FIG. 3 is for showing the functional blocks required in the description of the present embodiment, and does not exclude that the terminal device 10 includes the functional blocks other than those shown in the drawings.

The terminal device 10 includes an acquisition unit 11, a reception unit 13, a determination unit 15, a transmission unit 17, and an access control unit 19 as functional blocks.

The acquisition unit 11 acquires the number of MIMO layers for each of a plurality of CCs (component carriers). The acquisition unit 11 may acquire the number of MIMO layers for each of a plurality of CCs in advance from an external device, for example, the core network device 90 shown in FIG.

The receiving unit 13 receives various information from the base station device 50 shown in FIG. For example, the receiving unit 13 receives from the base station device 50 a "UECapacityEncury" for inquiring about the terminal capability information ("UECapacity Information") of the terminal device 10.

The determination unit 15 determines, for example, whether a specific number of MIMO layers satisfies a predetermined condition based on the number of MIMO layers for each of a plurality of CCs (component carriers) acquired by the acquisition unit 11. Details of the predetermined conditions will be described later.

The transmission unit 17 transmits various information to the base station device 50. For example, the transmission unit 13 transmits the terminal capability information of the terminal device 10 to the base station device 50 as a response to the "UECapacityEncurry".

For example, as shown in FIGS. 6 and 9 described later, the transmission unit 17 includes a frequency band (first band) of the highest Intra band 4CC CA including four (first number) component carriers (CC). ) And the number of MIMO layers in the lowest 1CC frequency band (second band) including one (second number) CC less than four (first number). Send to the station equipment. Further, the terminal device is a base station device 50 having the number of MIMO layers in the frequency band (third band) of the fallback CA when the number of MIMO layers in the first band and the number of MIMO layers in the second band satisfy predetermined conditions. Omit transmission to.

The access control unit 19 controls access processing (for example, CA processing) for transmitting a radio signal from the terminal device 10 to the base station device 50. The access control unit 19 controls access processing based on the information regarding the MIMO layer of each CC at the time of CA set by the base station apparatus 50.

The acquisition unit 11, the reception unit 13, and the transmission unit 17 may be realized by, for example, the communication device 24, or may be realized by the processor 21 executing the program stored in the storage device 23 in addition to the communication device 24. May be done. The determination unit 15 and the access control unit 19 may be realized by the processor 21 executing the program stored in the storage device 23. When executing a program, the program may be stored in a storage medium. The storage medium in which the program is stored may be a computer-readable non-transitory storage medium (Non-transitory computer readable medium). The non-temporary storage medium is not particularly limited, but may be, for example, a storage medium such as a USB (Universal Serial Bus) memory or a CD-ROM (Compact Disc ROM).

(Base station equipment)
The functional block configuration of the base station apparatus according to the first embodiment will be described with reference to FIG. FIG. 4 is a configuration diagram showing an example of a functional block configuration of the base station apparatus 50. Note that FIG. 4 is for showing the functional blocks required in the description of the present embodiment, and does not exclude that the base station apparatus 50 includes functional blocks other than those shown in the drawings.

The base station device 50 includes a receiving unit 51, a setting unit 53, a transmitting unit 55, and an access control unit 57 as functional blocks.

The receiving unit 51 receives the terminal capability information of the terminal device 10.

The setting unit 53 sets the MIMO layer of each CC at the time of CA based on the terminal capability information of the terminal device 10 received by the receiving unit 51.

The transmission unit 55 transmits "UECapacityEncurry" for inquiring the terminal capability information of the terminal device 10. The transmission unit 55 transmits information regarding the MIMO layer of each CC at the time of CA set by the setting unit 53 to the terminal device 10 as “RRC Configuration”.

The access control unit 57 controls access processing (for example, CA processing) for transmitting a wireless signal from the base station device 50 to the terminal device 10. The access control unit 57 controls the access process based on the information about the MIMO layer of each CC at the time of CA set by the base station apparatus 50 set by the setting unit 53.

The receiving unit 51 and the transmitting unit 55 may be realized by, for example, the communication device 24, or may be realized by the processor 21 executing the program stored in the storage device 23 in addition to the communication device 24. .. The setting unit 53 and the access control unit 57 may be realized by the processor 21 executing the program stored in the storage device 23. When executing a program, the program may be stored in a storage medium. The storage medium in which the program is stored may be a non-temporary storage medium that can be read by a computer. The non-temporary storage medium is not particularly limited, but may be, for example, a storage medium such as a USB memory or a CD-ROM.

<MIMO layer setting process>
(First Embodiment)
An example of the MIMO layer setting process according to the first embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a flowchart showing an example of the MIMO layer setting process according to the first embodiment of the present invention. As shown in FIG. 5, the base station apparatus 50 transmits “UECapacityEncurry” to the terminal apparatus 10 (step S1). The terminal device 10 determines whether or not a specific number of MIMO layers satisfies a predetermined condition based on the number of MIMO layers for each of a plurality of CCs (component carriers).

FIG. 6 is a conceptual diagram showing an example of a terminal capability information transmission process when the terminal device 10 implements eight antenna paths (8RF paths) in an Intra band 4CC CA in the first embodiment. The terminal capability information transmitted from the terminal device 10 to the base station device 50 includes, for example, information about the MIMO layer of each CC regarding various CAs that can be executed. Here, the number of first layers in the frequency band (first band) of the highest Intra band 4CC CA including 4 (first number) CCs, and less than 4 (first number). When the number of second layers in the frequency band (second band) of the lowest 1CC including one (second number) CC satisfies the "predetermined condition", the terminal device 10 transmits to the base station device 50. Some of the terminal capability information to be provided is omitted.

For example, in the "predetermined condition", the number of first layers is equal to or greater than the number of third layers in the frequency band (third band) of the fallback CA, and the number of second layers is each component carrier in the third band. Including that the number of layers is equal to or greater than the number of layers.

First, the case of Intra band 3CC CA as the fallback CA will be described with reference to FIG. The number of first layers (total number of MIMO layers) is based on CC # 0 (2x2), CC # 1 (2x2), CC # 2 (2x2) and CC # 3 (2x2). Calculated as "8", the number of third layers (total number of MIMO layers) in the frequency band of Intraband 3CC CA is CC # 0 (4x4), CC # 1 (2x2), and CC # 2 (CC # 2). It is calculated as "8" based on 2 × 2). Therefore, the number of first layers "8" is equal to or greater than the number of third layers "8" in the frequency band of Intra band 3CC CA. Further, the number of second layers is calculated as "4" based on CC # 0 (4 × 4). Regarding the number of layers of each component carrier in the third band, CC # 0 (4 × 4) of Intra band 3CC CA is “4”, and CC # 1 (2 × 2) is “2”. It is "2" for CC # 2 (2x2). Therefore, the number of second layers "4" is equal to or greater than the number of layers ("4" or "2") of each component carrier in the third band. Therefore, since the "number of first layers" and the "number of second layers" satisfy the above-mentioned predetermined conditions as described above, the terminal device 10 transmits information regarding the number of third layers in the frequency band of the Intra band 3CC CA. It can be omitted.

Next, the case of Intra band 2CC CA as the fallback CA will be described with reference to FIG. The number of first layers (total number of MIMO layers) is based on CC # 0 (2x2), CC # 1 (2x2), CC # 2 (2x2) and CC # 3 (2x2). Calculated as "8", the number of third layers (total number of MIMO layers) in the frequency band of Intraband 2CC CA is "8" based on CC # 0 (4x4) and CC # 1 (4x4). Is calculated. Therefore, the number of first layers "8" is equal to or greater than the number of third layers "8" in the frequency band of Intra band 2CC CA. Further, the number of second layers is calculated as "4" based on CC # 0 (4 × 4). Regarding the number of layers of each component carrier in the third band, CC # 0 (4 × 4) of Intra band 2CC CA is “4”, and CC # 1 (4 × 4) is “4”. Therefore, the number of second layers "4" is equal to or greater than the number of layers "4" of each component carrier in the third band. Therefore, since the "number of first layers" and the "number of second layers" satisfy the above-mentioned predetermined conditions as described above, the terminal device 10 transmits information regarding the number of third layers in the frequency band of the Intra band 2CC CA. Can also be omitted.

Returning to FIG. 5, the terminal device 10 transmits the terminal capability information to the base station device 50 as a response to the “UECapitalityEncurry”, which does not include the number of the third layers of the frequency band (third band) of the fallback CA (3rd band). Step S5). That is, as shown in FIG. 5, the terminal capability information includes the number of first layers (CC # 0 (2 × 2), CC # 1 (2 × 2)) in the frequency band of the highest Intra band 4CC CA. Only CC # 2 (2x2) and CC # 3 (2x2)) and the number of second layers (CC # 0 (4x4)) in the lowest 1CC frequency band including a single CC. Is included.

The base station device 50 sets the MIMO layer of each CC at the time of CA based on the terminal capability information transmitted from the terminal device 10. (Step S7). As shown in FIG. 6, for example, the base station apparatus 50 (setting unit 53 shown in FIG. 4) has the number of first layers (CC # 0 (2 × 2), CC) in the frequency band of the uppermost Intra band 4CC CA. # 1 (2x2), CC # 2 (2x2) and CC # 3 (2x2)), and the number of second layers (CC #) in the lowest 1CC frequency band containing a single CC. If only 0 (4 × 4)) is received, the terminal device 10 receives (4 × 4, 2 × 2, 2 × 2) of the Intra band 3CC CA and (4 × 4, 4 × 4) of the Intra band 2CC CA. ) Is supported. In this regard, when the base station apparatus 50 receives information regarding a higher CC (number of layers "4") of the Intra band CC CA from the terminal apparatus 10, the terminal apparatus 10 receives the CC (number of layers "4"). ) And lower CCs (number of layers "2") can be judged to be supported as a matter of course.

The base station device 50 transmits information regarding the MIMO layer of each CC at the time of set CA to the terminal device 10 as "RRC Configuration" (step S9).

As described above, according to the first embodiment, the terminal device 10 is the first layer of the frequency band (first band) of the uppermost Intra band 4CC CA including four (first number) component carriers (CC). The number and the number of second layers of the lowest 1CC frequency band (second band) including one (second number) CC less than four (first number) are used as the base station device. Send. When the number of first layers and the number of second layers satisfy predetermined conditions, the number of terminal devices is less than 4 (first number) and more than 1 (second number), or 2 or more. Transmission of the frequency band (third band) of the fallback CA including three (third number) CCs to the base station apparatus of the third layer number is omitted. Therefore, the terminal device 10 can largely omit the terminal capability information for transmitting to the base station device 50. Therefore, it is possible to improve the utilization efficiency of the wireless communication resource between the terminal device 10 and the base station device 50.

(Second Embodiment)
In the second embodiment, the terminal device 10 voluntarily performs a part of the terminal ability information in that the terminal device 10 omits the transmission of a part of the terminal ability information based on the advance notification from the base station device 50. This is different from the first embodiment in which transmission is omitted. Hereinafter, the points different from the first embodiment will be particularly described.

An example of the MIMO layer setting process according to the second embodiment will be described with reference to FIG. 7. FIG. 7 is a flowchart showing an example of MIMO layer setting processing at the time of carrier aggregation in the second embodiment. Since steps S13, S17 and S19 in FIG. 7 are the same processes as steps S3, S7 and S9 in FIG. 5, description thereof will be omitted.

As shown in FIG. 7, the terminal device 10 receives advance notification from the base station device that transmission of at least a part of the terminal capability information (information on the number of layers for each of a plurality of component carriers) can be omitted. (Step S11). The advance notice may be included in the "UECapacityEncurry" and transmitted to the terminal device 10.

When the terminal device 10 receives the advance notification, the transmission of information regarding the number of third layers in the frequency band of the fallback CA is omitted, and the terminal capability includes only the information regarding the number of first layers and the number of second layers. Information is transmitted to the base station apparatus 50. As the terminal capability information, the terminal capability information may include information (response information) indicating that information regarding the number of third layers in the frequency band of the fallback CA is omitted. (Step S15).

As described above, according to the second embodiment, the terminal device 10 omits the transmission of a part of the terminal capability information based on the advance notification from the base station device 50, and provides the response information in response to the notification to the base. Send to the station equipment. Therefore, when the base station apparatus 50 receives the response information, it can be understood that a part of the terminal capability information transmitted from the terminal apparatus 10 is omitted. That is, in the base station device 50, the MIMO layer information that is not included in the terminal capability information is not the information about the MIMO layer that the terminal device 10 does not support, but the information about the MIMO layer whose transmission is omitted in the terminal device 10. It becomes possible to determine that there is.

(Third Embodiment)
The third embodiment defines the transmission processing of the terminal capability information when the terminal device 10 implements 12 antenna paths (12 RF paths) in the Intra band 4CC CA, and the terminal device 10 defines the Intra band 4CC. It is different from the first embodiment that defines the transmission process of terminal capability information when eight antenna paths (8 RF paths) are implemented in CA. Hereinafter, the points different from the first embodiment will be particularly described.

An example of the MIMO layer setting process according to the third embodiment will be described with reference to FIGS. 8 and 9. FIG. 8 is a flowchart showing an example of MIMO layer setting processing at the time of carrier aggregation in the third embodiment. FIG. 9 is a conceptual diagram showing an example of a terminal capability information transmission process according to the third embodiment. Since steps S21 and S29 in FIG. 9 are the same processes as steps S1 and S9 in FIG. 5, description thereof will be omitted.

As shown in FIGS. 8 and 9, since the terminal device 10 implements 12 antenna paths (12RF paths) in the Intra band 4CC CA, the maximum number of MIMO layers is "12". Further, the number of first layers in the frequency band (first band) of the highest-level Intra band 4CC CA including four (first number) CCs is "8". Therefore, in the third embodiment, it is premised that the maximum number of MIMO layers and the number of first layers are different. Also in the third embodiment, when the “predetermined condition” is satisfied, a part of the terminal capability information transmitted from the terminal device 10 to the base station device 50 is omitted (steps S23 and S25).

For example, the "predetermined condition" includes that the maximum number of MIMO layers is equal to or greater than the number of third layers, and the number of second layers is equal to or greater than the number of layers of each component carrier in the third band.

First, the case of Intra band 3CC CA as the fallback CA will be described with reference to FIG. As described above, the maximum number of MIMO layers is "12". The number of third layers (total number of MIMO layers) is calculated as "8" based on CC # 0 (4x4), CC # 1 (2x2) and CC # 2 (2x2). Therefore, the maximum number of MIMO layers "12" is equal to or greater than the number of third layers "8". Further, the number of second layers is calculated as "4" based on CC # 0 (4 × 4). Regarding the number of layers of each component carrier in the third band, CC # 0 (4 × 4) of Intra band 3CC CA is “4”, and CC # 1 (2 × 2) is “2”. It is "2" for CC # 2 (2x2). Therefore, the number of second layers "4" is equal to or greater than the number of layers ("4" or "2") of each component carrier in the third band. Therefore, since the "maximum number of MIMO layers" and the "number of second layers" satisfy the above-mentioned predetermined conditions as described above, the terminal device 10 transmits information regarding the number of third layers in the frequency band of the Intra band 3CC CA. It can be omitted.

In the case of Intra band 2CC CA as the fallback CA, if the predetermined conditions are satisfied as in the case of Intra band 3CC CA, the terminal device 10 relates to the number of third layers in the frequency band of Intra band 2CC CA. Information transmission can be omitted.

As shown in FIG. 8, the terminal capability information includes the number of first layers (CC # 0 (2 × 2), CC # 1 (2 × 2), CC #) in the frequency band of the highest Intra band 4CC CA. Only 2 (2x2) and CC # 3 (2x2)) and the number of second layers (CC # 0 (4x4)) in the lowest 1CC frequency band containing a single CC are included. Is done. Further, the terminal capability information may further include information regarding the maximum number of MIMO layers.

The base station device 50 sets the MIMO layer of each CC at the time of CA based on the terminal capability information transmitted from the terminal device 10. (Step S27). As shown in FIG. 8, for example, the base station apparatus 50 (setting unit 53 shown in FIG. 4) has the number of first layers (CC # 0 (2 × 2), CC) in the frequency band of the uppermost Intra band 4CC CA. # 1 (2x2), CC # 2 (2x2) and CC # 3 (2x2)), and the number of second layers (CC #) in the lowest 1CC frequency band containing a single CC. If only 0 (4x4)) is received, the terminal device 10 will have the Intra band 3CC CA (4x4, 4x4, 4x4), (4x4, 4x4, 2x2). And (4x4, 2x2, 2x2), and (4x4, 4x4) of Intra band 2CC CA are judged to be supported.

As described above, according to the third embodiment, even if the maximum number of layers that can be used in CA in each band and the number of first layers are different, if a predetermined condition is satisfied, the terminal device 10 is a terminal. It is possible to omit the transmission of a part of the ability information.

Each of the above embodiments is for facilitating the understanding of the present invention, and does not limit the interpretation of the present invention. The present invention can be modified / improved without departing from the spirit of the present invention, and the present invention also includes an equivalent thereof. In addition, the present invention can form various disclosures by appropriately combining the plurality of components disclosed in each of the above embodiments. For example, some components may be removed from all the components shown in the embodiments. Further, the components may be appropriately combined in different embodiments.

10 (10-1 ... 10-m) ... Terminal device, 11 ... Acquisition unit, 13, 51 ... Reception unit, 15 ... Judgment unit, 17, 55 ... Transmission unit, 19, 57 ... Access control unit, 21 ... Processor, 22 ... Memory, 23 ... Storage device, 24 ... Communication device, 25 ... Input device, 26 ... Output device, 27 ... Antenna, 29 ... Sensor, 50 (50-1 ... 50-n) ... Base station device, 53 ... Setting Department, 90 ... Core network device, 100 ... Mobile communication system

Claims

A terminal device in a mobile communication system that supports carrier aggregation.
An acquisition unit that acquires the number of layers for each of multiple component carriers,
The base station apparatus includes the number of first layers of the first band including the first number of component carriers and the number of second layers of the second band including the second number of component carriers less than the first number. Equipped with a transmitter to send to
The transmitter has a third number of components that is less than the first number and greater than the second number when the number of the first layer and the number of the second layer satisfy a predetermined condition. The transmission of the number of third layers of the third band including the carrier to the base station apparatus is omitted.
Terminal device.
The predetermined conditions are
The number of the first layers is equal to or greater than the number of the third layers, and
The number of the second layers includes the number of layers of each component carrier in the third band or more.
The terminal device according to claim 1.
The second band comprises a single component carrier.
The terminal device according to claim 1 or 2.
Further, a receiving unit for receiving a notification from the base station apparatus that transmission of at least a part of the number of layers for each of the plurality of component carriers can be omitted is provided.
When receiving the notification, the transmission unit omits transmission of the third layer number to the base station device and transmits response information in response to the notification to the base station device.
The terminal device according to any one of claims 1 to 3.
When the maximum number of layers that can be used in the carrier aggregation in each band and the number of the first layers are different from each other, the maximum number of layers is equal to or greater than the number of the third layers, and the transmission unit has the same number of layers. When the number of second layers is equal to or greater than the number of layers of each component carrier in the third band, transmission of the number of third layers to the base station apparatus is omitted.
The terminal device according to any one of claims 1 to 4.
A wireless communication method used by terminal devices in mobile communication systems that support carrier aggregation.
Steps to get the number of layers for each of multiple component carriers,
The base station apparatus includes the number of first layers of the first band including the first number of component carriers and the number of second layers of the second band including the second number of component carriers less than the first number. With steps to send to,
When the number of the first layer and the number of the second layer satisfy a predetermined condition, the transmission step is a third number less than the first number and more than the second number. The transmission of the third layer number of the third band including the component carrier to the base station apparatus is omitted.
Wireless communication method.