WO2024058002A1

WO2024058002A1 - Base station device, terminal device, and communication control method

Info

Publication number: WO2024058002A1
Application number: PCT/JP2023/032327
Authority: WO
Inventors: 廉菅井; 直紀草島
Original assignee: ソニーグループ株式会社
Priority date: 2022-09-13
Filing date: 2023-09-05
Publication date: 2024-03-21

Abstract

The present disclosure simplifies a procedure for in-band full-duplex communication. A base station device according to the the present disclosure has a control unit. The control unit of the base station device performs, in a communication system that performs in-band full-duplex communication: control for detecting an interference region that includes terminal devices of other cells that interfere, through transmission signals of uplink communication in the same frequency band, with a terminal device performing downlink communication with the host base station device; and control for causing the other terminal devices included in the detected interference region to perform an interference suppression operation.

Description

Base station device, terminal device and communication control method

The present disclosure relates to a base station device, a terminal device, and a communication control method.

In order to improve the efficiency of frequency use in wireless communication devices, in-band full duplex communication is being considered. This in-band full-duplex communication is a method of performing full-duplex communication in the same band. Compared to full-duplex communication in which transmission and reception are performed in different bands, frequency usage efficiency can be doubled.

In this in-band full-duplex communication, it is possible for a terminal device to transmit an uplink signal to a base station device and at the same time a different terminal device in the same cell receive a downlink signal from the base station device. It becomes possible. In this case, inter-terminal interference, which is interference between terminal devices in which a transmitted uplink signal interferes with a downlink signal of another terminal, becomes a problem. In order to prevent this inter-terminal interference, a communication device that measures inter-terminal interference before in-band full-duplex communication has been proposed (see, for example, Patent Document 1).

International Publication No. 2019/142512

However, the above-mentioned conventional technology has the problem that full-duplex communication is performed by searching for an appropriate combination of a terminal device that receives a downlink signal and a terminal device that transmits an uplink signal, making the procedure complicated. be. In particular, there is a problem in that the procedure for in-band full-duplex communication becomes complicated when interference is received from terminal devices in different cells.

Therefore, the present disclosure proposes a base station device, a terminal device, and a communication control method that simplify the procedure of in-band full-duplex communication.

In a communication system that performs in-band full-duplex communication, a base station device according to the present disclosure prevents interference with a terminal device that performs downlink communication with its own base station device by a transmission signal of uplink communication in the same frequency band. The control unit includes a control unit that performs control to detect an interference region that is a region including terminal devices of other cells that cause interference, and control to cause other terminal devices included in the interference region to perform an interference suppression operation.

Furthermore, in a communication system that performs in-band full-duplex communication, the terminal device according to the present disclosure provides a transmission signal for uplink communication in the same frequency band to a terminal device in another cell that performs downlink communication with the base station device. The terminal device is located in an interference area that is an area including terminal devices that cause interference, and includes a control unit that performs interference suppression operations based on notifications from the base station device.

Furthermore, in a communication system that performs in-band full-duplex communication, the communication method according to the present disclosure provides for a terminal device that performs downlink communication with its own base station device to interfere with transmission signals of uplink communication in the same frequency band. This communication control method includes detecting an interference region that is a region including terminal devices of other cells that cause interference, and causing other terminal devices included in the interference region to perform an interference suppression operation.

Furthermore, in a communication system that performs in-band full-duplex communication, the communication method according to the present disclosure provides a transmission signal for uplink communication in the same frequency band to a terminal device in another cell that performs downlink communication with the base station device. This communication control method includes performing an interference suppression operation based on a notification from the base station device when the base station device is placed in an interference area that includes a terminal device that causes interference.

1 is a diagram illustrating an example of the overall configuration of a communication system according to an embodiment of the present disclosure. FIG. 1 is a diagram illustrating a configuration example of a base station device according to an embodiment of the present disclosure. FIG. 1 is a diagram illustrating a configuration example of a terminal device according to an embodiment of the present disclosure. FIG. 2 is a diagram illustrating an example of in-band full-duplex communication according to an embodiment of the present disclosure. FIG. 1 is a diagram illustrating an example of a communication system according to an embodiment of the present disclosure. FIG. 3 is a diagram illustrating an example of a processing procedure of communication control processing according to an embodiment of the present disclosure. FIG. 3 is a diagram illustrating an example of a processing procedure of detection processing of an interference protection terminal device according to an embodiment of the present disclosure. FIG. 3 is a diagram illustrating an example of a processing procedure of interference region detection processing according to an embodiment of the present disclosure. FIG. 3 is a diagram illustrating an example of a processing procedure of interference suppression processing according to an embodiment of the present disclosure. FIG. 7 is a diagram illustrating another example of the processing procedure of communication control processing according to the embodiment of the present disclosure.

Embodiments of the present disclosure will be described in detail below based on the drawings. The explanation will be given in the following order. In addition, in each of the following embodiments, the same portions are given the same reference numerals and redundant explanations will be omitted.
1. Basic configuration 2. Embodiment

(1. Basic configuration)
[System configuration]
FIG. 1 is a diagram illustrating an example of the overall configuration of a communication system 1 according to an embodiment of the present disclosure. As shown in FIG. 1, the communication system 1 includes a plurality of base station devices 20 (

base station devices

20A and 20B), a plurality of terminal devices 40 (

terminal devices

40A, 40B, and 40C), a core network 120, and a packet data network. (PDN: Packet Data Network) 130. Note that the number of each device is not limited to this. For example, there may be one base station device 20 and one terminal device 40.

The base station device 20 is a communication device that operates a cell 110 and provides wireless communication services to one or more terminal devices 40 located within the coverage of the cell 110. The cell 110 is operated according to any wireless communication method such as LTE or NR. Base station device 20 is connected to core network 120. Core network 120 is connected to packet data network 130 via a gateway device (not shown). Note that the base station device 20 may be configured as a set of a plurality of physical or logical devices. For example, in the embodiment of the present disclosure, the base station device 20 is classified into a plurality of devices, such as a BBU (Baseband Unit) and an RU (Radio Unit), and may be interpreted as a collection of these devices. Additionally or alternatively, in the embodiment of the present disclosure, the base station device 20 may be either or both of a BBU and an RU. The BBU and RU may be connected through a predetermined interface (eg, eCPRI). Additionally or alternatively, the RU may be referred to as RRU (Remote Radio Unit) or RD (Radio DoT). Additionally or alternatively, the RU may correspond to a gNB-DU described below. Additionally or alternatively, the BBU may correspond to a gNB-CU described below. Additionally or alternatively, the RU may be a device integrally formed with the antenna. Even if the antenna possessed by the base station device 20 (for example, an antenna formed integrally with the RU) adopts an advanced antenna system and supports MIMO (for example, FD-MIMO) or beamforming, good. In the advanced antenna system, the antenna included in the base station device 20 (for example, an antenna formed integrally with the RU) may include, for example, 64 transmitting antenna ports and 64 receiving antenna ports. .

Furthermore, a plurality of base station devices 20 may be connected to each other. One or more base station devices 20 may be included in a radio access network (RAN). That is, the base station device 20 may be simply referred to as RAN, RAN node, AN (Access Network), or AN node. RAN in LTE is called EUTRAN (Enhanced Universal Terrestrial RAN). RAN in NR is called NGRAN. The RAN in W-CDMA (UMTS) is called UTRAN. The LTE base station device 20 is called an eNodeB (Evolved Node B) or eNB. That is, EUTRAN includes one or more eNodeBs (eNBs). Further, the NR base station device 20 is called gNodeB or gNB. That is, NGRAN includes one or more gNBs. Furthermore, EUTRAN may include a gNB (en-gNB) connected to a core network (EPC) in an LTE communication system (EPS). Similarly, NGRAN may include an ng-eNB connected to a core network 5GC in a 5G communication system (5GS). Additionally or alternatively, when the base station device 20 is an eNB, gNB, etc., it may be referred to as 3GPP (registered trademark) access. Additionally or alternatively, if the base station device 20 is a wireless access point (Access Point), it may be referred to as Non-3GPP access. Additionally or in place of this, the base station device 20 may be an optical equipment called RRH (Remote Radio Head). Additionally or alternatively, when the base station device 20 is a gNB, the base station device 20 is referred to as a combination of the above-mentioned gNB-CU (Central Unit) and gNB-DU (Distributed Unit), or any one of these. Good too. The gNB-CU hosts multiple upper layers (eg, RRC, SDAP, and PDCP) among AS (Access Stratum) for communication with the UE. On the other hand, the gNB-DU hosts multiple lower layers (eg, RLC, MAC, and PHY) of the AS. That is, among the messages and information described below, RRC signaling (for example, MIB, various SIBs including SIB1, RRC setup messages, and RRC reconfiguration messages) is generated by the gNB-CU, while DCI and various Physical channels (eg, PDCCH and PBCH) may be generated in gNB-DU. Alternatively, some configurations of the RRC signaling, such as IE: cellGroupConfig, may be generated in the gNB-DU, and the remaining configurations may be generated in the gNB-CU. These configurations may be sent and received via the F1 interface, which will be described later. The base station device 20 may be configured to be able to communicate with other base station devices 20. For example, when the plurality of base station apparatuses 20 are eNBs or a combination of eNBs and gNBs, the base station apparatuses 20 may be connected by an X2 interface. Additionally or alternatively, when the plurality of base station apparatuses 20 are a combination of gNBs or gn-eNBs and gNBs, the apparatuses may be connected through an Xn interface. Additionally or alternatively, when the plurality of base station devices 20 are a combination of gNB-CUs and gNB-DUs, the devices may be connected through the F1 interface described above. Messages and information (RRC signaling or DCI information, Physical Channel), which will be described later, may be communicated between a plurality of base station devices 20 (for example, via the X2, Xn, and F1 interfaces).

Furthermore, as described above, the base station device 20 may be configured to manage multiple cells. The cell provided by the base station device 20 is called a serving cell. Surping cells include PCell (Primary Cell) and SCell (Secondary Cell). Dual connectivity (e.g., EUTRA-EUTRA Dual Connectivity, EUTRA-NR Dual Connectivity (ENDC), EUTRA-NR Dual Connectivity with 5GC, NR-EUTRA Dual Connectivity (NEDC), NR-NR Dual Connectivity) is 40), the PCell and zero or more SCells (S) provided by the MN (Master Node) are called an MCG (Master Cell Group). Furthermore, the surping cell may include a PSCell (Primary Secondary Cell or Primary SCG Cell). That is, when Dual Connectivity is provided to the UE, the PSCell and zero or more SCells (S) provided by the SN (Secondary Node) are called an SCG (Secondary Cell Group). Unless otherwise configured (eg, PUCCH on SCell), the Physical Uplink Control Channel (PUCCH) is transmitted on the PCell and PSCell, but not on the SCell. Furthermore, Radio Link Failure is also detected in PCell and PSCell, but not detected in SCell (it does not need to be detected). In this way, PCell and PSCell have a special role in the serving cell (S), so they are also called SpCell (Special Cell). One downlink component carrier and one uplink component carrier may be associated with one cell. Further, the system bandwidth corresponding to one cell may be divided into a plurality of bandwidth parts (BWP). In this case, one or more BWPs may be configured in the UE, and one BWP may be used as an Active BWP in the UE. Furthermore, the radio resources (for example, frequency band, numerology (subcarrier spacing), slot configuration) that can be used by the terminal device 40 may differ for each cell, each component carrier, or each BWP.

When the core network 120 is an NR core network (5G Core (5GC)), the core network 120 includes AMF (Access and Mobility Management Function), SMF (Session Management Function), UPF (User Plane Function), and PCF (Policy Control). Function) and UDM (Unified Data Management).

When the core network 120 is an LTE core network (Evolved Packet Core (EPC)), the core network 120 includes MME (Mobility Management Entity), S-GW (Serving gateway), P-GW (PDN gateway), PCRF (Policy and Charging Rule Function) and HSS (Home Subscriber Server). The AMF and MME are control nodes that handle control plane signals and manage the mobility of the terminal device 40. The UPF and S-GW/P-GW are nodes that handle user plane signals. The PCF/PCRF is a control node that controls policies such as QoS (Quality of Service) and accounting for PDU sessions or bearers. The UDM/HSS is a control node that handles subscriber data and performs service control.

The terminal device 40 is a communication device that wirelessly communicates with the base station device 20 based on the control by the base station device 20. For example, the terminal device 40 measures the downlink signal from the base station device 20 and reports measurement information indicating the measurement result to the base station device 20. Base station device 20 controls wireless communication with terminal device 40 based on the reported measurement information. On the other hand, the terminal device 40 may transmit an uplink signal for measurement to the base station device 20. In that case, the base station device 20 measures the uplink signal from the terminal device 40 and controls wireless communication with the terminal device 40 based on the measurement information.

As described above, the base station devices 20 can send and receive information to and from each other using the inter-base station interface. When the core network is 5GC, the inter-base station interface may be an Xn interface. When the core network is EPC, the inter-base station interface may be an X2 interface. For example, the base station device 20 transmits measurement information regarding the terminal device 40 for which handover is predicted (for example, measurement results of cells managed by the source base station device and measurement results of adjacent cells) to other adjacent base station devices 20. Send to. As a result, stable handover is realized, and the stability of wireless communication of the terminal device 40 is ensured.

Although not shown in FIG. 1, the communication system 1 is surrounded by wireless communications operated by other RATs other than cellular communications, such as Wi-Fi (registered trademark) and MulteFire (registered trademark). There may be communication devices that provide services. Such communication devices are typically connected to a packet data network 130.

[Base station device configuration]
FIG. 2 is a diagram illustrating a configuration example of the base station device 20 according to the embodiment of the present disclosure. The base station device 20 is a communication device (wireless system) that wirelessly communicates with the terminal device 40. The base station device 20 is a type of information processing device.

The base station device 20 includes a signal processing section 21, a storage section 22, a network communication section 23, and a control section 24. Note that the configuration shown in the figure is a functional configuration, and the hardware configuration may be different from this. Further, the functions of the base station device 20 may be distributed and implemented in a plurality of physically separated devices.

The signal processing unit 21 is a wireless communication interface that wirelessly communicates with other communication devices (for example, the terminal device 40 and other base station devices 20). The signal processing section 21 operates under the control of the control section 24. The signal processing unit 21 may be compatible with multiple wireless access methods. For example, the signal processing unit 21 may support both NR and LTE. The signal processing unit 21 may be compatible with other cellular communication systems such as W-CDMA and cdma2000. Further, the signal processing unit 21 may support a wireless LAN communication method in addition to the cellular communication method. Of course, the signal processing unit 21 may only support one wireless access method.

The signal processing section 21 includes a reception processing section 211, a transmission processing section 212, and an antenna 113. The signal processing section 21 may each include a plurality of reception processing sections 211, transmission processing sections 212, and antennas 113. Note that when the signal processing section 21 supports multiple wireless access methods, each section of the signal processing section 21 can be configured individually for each wireless access method. For example, if the base station device 20 supports NR and LTE, the reception processing section 211 and the transmission processing section 212 may be configured separately for NR and LTE.

The reception processing unit 211 processes uplink signals received via the antenna 113. The reception processing section 211 includes a radio reception section 211a, a demultiplexing section 211b, a demodulation section 211c, and a decoding section 211d.

The radio receiving unit 211a performs down-conversion, removal of unnecessary frequency components, control of amplification level, orthogonal demodulation, conversion to a digital signal, removal of guard intervals, and fast Fourier transformation of the frequency domain signal for the uplink signal. Extract etc. For example, assume that the wireless access method of the base station device 20 is a cellular communication method such as LTE. At this time, the demultiplexing section 211b separates uplink channels such as PUSCH (Physical Uplink Shared Channel) and PUCCH (Physical Uplink Control Channel) and uplink reference signals from the signal output from the radio receiving section 211a. The demodulation unit 211c demodulates the received signal using modulation schemes such as BPSK (Binary Phase Shift Keying) and QPSK (Quadrature Phase Shift Keying) on modulation symbols of the uplink channel. The modulation method used by the demodulator 211c may be multilevel QAM such as 16QAM (Quadrature Amplitude Modulation), 64QAM, or 256QAM. The decoding unit 211d performs decoding processing on the coded bits of the demodulated uplink channel. The decoded uplink data and uplink control information are output to the control unit 24.

The transmission processing unit 212 performs transmission processing of downlink control information and downlink data. The transmission processing section 212 includes an encoding section 212a, a modulation section 212b, a multiplexing section 212c, and a wireless transmission section 212d.

The encoding unit 212a encodes the downlink control information and downlink data input from the control unit 24 using encoding methods such as block encoding, convolutional encoding, and turbo encoding. The modulator 212b modulates the encoded bits output from the encoder 212a using a predetermined modulation method such as BPSK, QPSK, 16QAM, 64QAM, and 256QAM. The multiplexing unit 212c multiplexes the modulation symbol of each channel and the downlink reference signal, and arranges it in a predetermined resource element. The wireless transmitter 212d performs various signal processing on the signal from the multiplexer 212c. For example, the wireless transmitter 212d performs conversion into the time domain using fast Fourier transform, addition of a guard interval, generation of a baseband digital signal, conversion to an analog signal, orthogonal modulation, upconversion, removal of extra frequency components, and Performs processing such as power amplification. The signal generated by the transmission processing section 212 is transmitted from the antenna 113.

The storage unit 22 is a data readable/writable storage device such as DRAM, SRAM, flash memory, and hard disk. The storage unit 22 functions as a storage means of the base station device 20.

The network communication unit 23 is a communication interface for communicating with other devices (for example, other base station devices 20). For example, the network communication unit 23 is a LAN (Local Area Network) interface such as a NIC (Network Interface Card). The network communication unit 23 may be a USB (Universal Serial Bus) interface configured by a USB host controller, a USB port, or the like. Further, the network communication unit 23 may be a wired interface or a wireless interface. The network communication unit 23 functions as a network communication means for the base station device 20. The network communication unit 23 communicates with other devices under the control of the control unit 24.

The control unit 24 is a controller that controls each part of the base station device 20. The control unit 24 is realized by, for example, a processor such as a CPU (Central Processing Unit) and an MPU (Micro Processing Unit). For example, the control unit 24 is realized by a processor executing various programs stored in a storage device inside the base station device 20 using a RAM (Random Access Memory) or the like as a work area. Note that the control unit 24 may be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). CPUs, MPUs, ASICs, and FPGAs can all be considered controllers.

[Terminal device configuration]
FIG. 3 is a diagram illustrating a configuration example of the terminal device 40 according to the embodiment of the present disclosure. The terminal device 40 is a communication device (wireless system) that wirelessly communicates with the base station device 20. The terminal device 40 is a type of information processing device.

The terminal device 40 includes a signal processing section 41, a storage section 42, an input/output section 44, and a control section 45. Note that the configuration shown in the figure is a functional configuration, and the hardware configuration may be different from this. Further, the functions of the terminal device 40 may be distributed and implemented in a plurality of physically separated configurations.

The signal processing unit 41 is a wireless communication interface that wirelessly communicates with other communication devices (for example, the base station device 20 and other terminal devices 40). The signal processing section 41 operates under the control of the control section 45. The signal processing unit 41 supports one or more wireless access methods. For example, the signal processing unit 41 supports both NR and LTE. The signal processing unit 41 may be compatible with other wireless access methods such as W-CDMA (registered trademark) and cdma2000 (registered trademark).

The signal processing section 41 includes a reception processing section 411, a transmission processing section 412, and an antenna 213. The signal processing section 41 may each include a plurality of reception processing sections 411, transmission processing sections 412, and antennas 213. Note that when the signal processing section 41 supports multiple wireless access methods, each section of the signal processing section 41 can be configured individually for each wireless access method. For example, the reception processing unit 411 and the transmission processing unit 412 may be configured separately for LTE and NR. The configurations of the reception processing section 411 and the transmission processing section 412 are similar to the reception processing section 211 and the transmission processing section 212 of the base station device 20.

The storage unit 42 is a data readable/writable storage device such as DRAM, SRAM, flash memory, and hard disk. The storage unit 42 functions as a storage means of the terminal device 40.

The input/output unit 44 is a user interface for exchanging information with the user. For example, the input/output unit 44 is an operating device such as a keyboard, a mouse, an operation key, a touch panel, etc. for the user to perform various operations. Alternatively, the input/output unit 44 is a display device such as a liquid crystal display or an organic electroluminescence display. The input/output unit 44 may be an audio device such as a speaker or a buzzer. Further, the input/output unit 44 may be a lighting device such as an LED (Light Emitting Diode) lamp. The input/output unit 44 functions as an input/output means (input means, output means, operation means, or notification means) of the terminal device 40.

The control unit 45 is a controller that controls each part of the terminal device 40. The control unit 45 is realized by, for example, a processor such as a CPU and an MPU. For example, the control unit 45 is realized by a processor executing various programs stored in a storage device inside the terminal device 40 using a RAM or the like as a work area. Note that the control unit 45 may be realized by an integrated circuit such as ASIC or FPGA. CPUs, MPUs, ASICs, and FPGAs can all be considered controllers.

As described later, the communication system 1 performs in-band full-duplex communication. This causes interference in link communication. The measurement of this interference state will be explained.

[Channel measurement]
In this embodiment, the terminal device 40 and the base station device 20 measure the state of the propagation path. The terminal device 40 and the base station device 20 measure the received power of a predetermined signal or the received power of all signals using the configured resources. The received power of a predetermined signal is also called RSRP (Reference Signal Received Power). The received power of all signals is also called RSSI (Received Signal Strength Indicator).

In 3GPP (registered trademark), examples of types of channel measurements include CSI (Channel State Information) measurement and RRM (Radio Resource Management) measurement. CSI measurement is also called L1 (Layer 1) measurement, and RRM measurement is also called L3 (Layer 3) measurement.

[CSI measurement]
The results of CSI measurement are mainly used for dynamic resource allocation such as dynamic scheduling.

The signal strength in downlink CSI measurement is measured using, for example, CSI-RS. Downlink CSI measurements are reported to the base station as CSI feedback. Downlink CSI is CQI (Channel Quality indicator), PMI (Precoding Matrix Indicator), CRI (CSI-RS Resource Indicator), SSBRI (SS/PBCH Block Resource Indicator), LI (Layer Indicator), RI (Rank Indicator). , and/or L1-RSRP.

CQI is information indicating channel quality with the serving cell. The terminal device 40 calculates an SINR that satisfies a predetermined PDSCH error rate as a CQI index, and feeds it back to the base station device 20. The predetermined error rate is, for example, 10 ⁻¹ for eMBB and 10 ⁻⁵ for URLLC.

PMI is information indicating a precoding matrix desired by the terminal device 40. Terminal device 40 calculates a precoding matrix suitable for PDSCH reception and feeds it back to base station device 20 as PMI.

CRI is information indicating a CSI-RS with good reception quality. The terminal device 40 detects a CSI-RS with a high CSI-RSRP and feeds back the CRI corresponding to the CSI-RS to the base station device 20.

SSBRI is information indicating an SS/PBCH block with good reception quality. The terminal device 40 detects an SS/PBCH block with a high SS-RSRP and feeds back the SSBRI corresponding to the SS/PBCH block to the base station device 20.

LI is information indicating the strongest layer among multiple layers. The terminal device 40 calculates the layer with high reception strength and feeds it back to the base station device 20 as LI.

RI is information indicating the number of ranks desired by the terminal device 40. The terminal device 40 calculates an appropriate rank number according to the number of antennas and reception quality, and feeds it back to the base station device 20.

L1-RSRP is information on RSRP in layer 1 (physical layer). L1-RSRP is characterized by a shorter measurement and reporting cycle than RSRP in RRM measurement, which will be described later.

In downlink CSI measurement, a set (CSI Resource Setting) of resources for performing channel measurement and resources for performing interference measurement is defined. Resources for performing channel measurements are defined as NZP CSI-RS resources. Resources for performing interference measurements are defined as CSI-IM resources or NZP CSI-RS. The base station device 20 configures one or more CSI resource settings for the terminal device 40. The terminal device 40 measures desired signal power and interference power and calculates channel quality (SINR, CQI, etc.) based on the configured CSI resource settings.

The signal strength in uplink CSI measurement is measured using, for example, SRS (Sounding Reference Signal). There are three types of SRS transmission methods: periodic SRS transmission, semi-persistent SRS transmission, and aperiodic SRS transmission. In periodic SRS transmission, when SRS resources are configured by RRC, the terminal device 40 transmits SRS using the configured SRS resources. In semi-persistent SRS transmission, when SRS resources are configured by RRC and an activation instruction for SRS transmission is received by DCI, the terminal device 40 remains configured until it receives a deactivation instruction. SRS is transmitted using the SRS resources that have been created. In aperiodic SRS transmission, when SRS resources are configured by RRC and an SRS transmission trigger instruction is issued by DCI, the terminal device 40 transmits SRS once using the configured SRS resources.

RRC sets the time/frequency resources on which the SRS is transmitted. The SRS is transmitted in the last six symbols of the slot. In periodic SRS transmission and semi-persistent SRS transmission, the SRS has a period and a slot offset.

[RRM measurement]
The results of RRM measurement are mainly used for semi-static resource control such as RRC configuration and handover processing. In the RRM measurement, for example, RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), RSSI (Received Signal Strength Indicator), and SINR (Signal to Interference plus Noise power Ratio) are measured.

RSRP (also referred to as L3-RSRP) in RRM measurement is measured using, for example, SS/PBCH block or CSI-RS. RSRP in RRM measurement is calculated from one or more L1-RSRPs. For example, RSRP in RRM measurement is calculated as an average value of a plurality of L1-RSRPs with different measurement resources.

RSSI is the total received power for a given resource, including interference and noise. The predetermined resources may be set from the base station device 20.

RSRQ is defined by RSRP×number of resource blocks of RSSI measurement bandwidth/RSSI.

SINR is defined as the ratio of signal reception power to interference noise power in a predetermined resource.

(2. Embodiment)
[Communication system configuration]
FIG. 4 is a diagram illustrating an example of in-band full-duplex communication according to an embodiment of the present disclosure. This figure is a diagram showing the state of uplink communication and downlink communication shown in FIG. 5, which will be described later. The horizontal axis in the figure represents time, and the vertical axis represents frequency. As shown in the figure, in-band full-duplex communication is a communication method in which transmission and reception are performed simultaneously using the same band.

The 5G communication standard allows a single wireless system to support various communication use cases such as URLLC (Ultra-Reliable and Low Latency Communication) in addition to eMBB (enhanced Mobile Broadband) for conventional smartphone data communication. It is assumed. Note that URLLC is a wireless communication that requires either or both of high reliability and low delay, such as emergency message transmission used in automatic driving. Assuming the introduction of in-band full-duplex communication technology, data with different requirements will be sent and received simultaneously. For example, a URLLC packet is multiplexed during reception of an eMBB packet. By enabling transmission and reception at the same time, it is possible to reduce the transmission waiting delay compared to time division duplex (TDD) systems, and ensure the QoS (Quality of Service) of URLLC. can.

FIG. 5 is a diagram illustrating an example of a communication system according to an embodiment of the present disclosure. This figure is a diagram showing an example of the communication system 1. As shown in FIG. The communication system 1 includes a base station device 20A and a terminal device 40A. The base station device 20A in the figure operates a cell 110A. Furthermore, the base station device 20A performs downlink communication with the terminal device 40A. On the other hand, the terminal device 40B located at the end of the cell 110B adjacent to the cell 110A performs uplink communication with the base station device 20B operating the cell 110B. When the uplink communication of the terminal device 40B and the downlink communication of the terminal device 40A are performed using in-band full-duplex communication, interference occurs. That is, the reception signal of the downlink communication of the terminal device 40A receives interference from the transmission signal of the uplink communication of the terminal device 40B. The dashed arrow in the figure represents this interference. In order to suppress this inter-terminal interference between different cells, the base station apparatus 20A causes the terminal apparatus 40B to perform an interference suppression operation. This interference suppression operation is an operation for suppressing interference of the terminal device 40B with the terminal device 40A. Details of the interference suppression operation will be described later.

The base station device 20A requests the terminal device 40B to perform an interference suppression operation by transmitting a notification of the interference suppression operation. At this time, the base station device 20A transmits a notification of interference suppression operation to the terminal device 40 included in the interference area 190. Here, the interference region 190 is an area composed of a group of terminals that interfere with the terminal device 40A that performs downlink communication with the base station device 20A, for example, the transmission of uplink communication in the same frequency band in FIG. This is an area including the terminal device 40B of another cell 110B that causes interference with the signal. The interference region 190 in the figure represents an example in which the terminal device 40B of the adjacent cell 110B is included.

The base station device 20A in the figure detects an interference region 190 for the terminal device 40A that desires downlink communication using in-band full-duplex communication. Next, when the terminal device 40A performs downlink communication using in-band full-duplex communication, it notifies the other terminal devices 40 (terminal device 40B in the figure) included in the interference area 190 of the interference suppression operation. conduct. Thereby, interference that the terminal device 40A receives can be reduced.

[Communication control processing]
6 is a diagram showing an example of a processing procedure of a communication control process according to an embodiment of the present disclosure. The figure is a flow chart showing an example of a processing procedure of a communication process of the base station device 20A. First, the base station device 20A detects an interference-protected terminal device (step S101). Here, the interference-protected terminal device is a terminal device that performs an interference protection operation during in-band full-duplex communication including a terminal that transmits data of the above URLLC requirements, and corresponds to the terminal device 40A in FIG. 5, for example. Details of the detection process of the interference-protected terminal device will be described later.

As a result, if there is no interference protection terminal device (step S102, No), the base station device 20A ends the process. On the other hand, if there is an interference protection terminal device (step S102, Yes), the base station device 20A performs interference area detection processing (step S110). Note that details of the interference area detection process will be described later.

Next, the base station device 20A allocates radio resources to the terminal device 40B (step S103). Next, the base station device 20A notifies the other terminal devices 40 included in the interference region 190 of the interference suppression operation (step S104), and ends the process.

The base station device 20A identifies whether there is a terminal device 40 that corresponds to an interference protection terminal device among the terminal devices 40 under its control. The operation of identifying this interference protection terminal device includes the received power or received SINR (Signal to Interference and Noise power Ratio) of the terminal device 40, the required QoS (Quality of Service) of the signal to be transmitted, and the terminal devices of other nearby cells. This is an operation of determining an interference protection terminal device according to information such as distribution. At this time, a measurement operation may be performed on the terminal device 40A side in order to know the status of the received SINR and the distribution of peripheral terminal devices.

[Detection of interference protection terminal device]
FIG. 7 is a diagram illustrating an example of a processing procedure of detection processing of an interference protection terminal device according to an embodiment of the present disclosure. This figure is a sequence diagram showing an example of the processing procedure of the interference protection terminal device detection process of the base station device 20A. First, the base station device 20A requests the terminal device 40A to measure interference from other cells (step S201). This interference measurement corresponds to measuring interference from the terminal device 40B of another cell 110B in the terminal device 40A. The base station device 20A, for example, transmits a signal requesting interference measurement to another terminal device 40 (terminal device 40B in FIG. 5). Furthermore, the base station device 20A specifies radio resources for transmission and reception using this signal.

Next, the terminal device 40A requests the terminal devices 40 of other surrounding cells (terminal device 40B in the figure) to transmit an interference measurement signal (step S202). Specifically, the terminal device 40A transmits a signal requesting the terminal device 40B and the like to transmit an interference measurement signal. The terminal device 40B refers to the cell ID of the signal and determines whether this signal has arrived from a terminal device in a cell different from its own cell. The terminal device (terminal device 40B) of another cell that has received the signal requesting the transmission of a signal for measuring interference transmits an interference measurement signal that is a signal for measuring interference (step S203). When a terminal device (terminal device 40B) in another cell transmits a high QoS signal that requires low delay, the terminal device transmits that information in a signal for measuring interference or in another signal. The device 40A is notified. Next, the terminal device 40 terminal detects its own received SINR and the distribution of surrounding terminal devices 40 in other cells transmitting high QoS signals based on the received signal for measuring interference, and uses the information. The measurement results are transmitted to the base station device 20A (step S204). The base station device 20A detects the interference protection terminal device based on this measurement result. For example, when the reception SINR of the measurement result is relatively low, the base station device 20A can detect the terminal device 40A as an interference protection terminal device.

Note that the base station device 20A may perform a series of operations for identifying an interference protection terminal device on a single terminal device 40 or may perform the series of operations on a plurality of terminal devices 40. When transmitting a signal requesting measurement of interference from other cells to a plurality of terminal devices 40, orthogonal resources are allocated to each terminal device 40.

[Detection of interference area]
FIG. 8 is a diagram illustrating an example of a processing procedure of interference region detection processing according to an embodiment of the present disclosure. This figure is a flowchart showing an example of the processing procedure of interference area detection (step S110) in FIG. 6.

When an interference-protected terminal device (terminal device 40A in this case) exists, base station device 20A acquires interference information for the interference-protected terminal device. This interference information is information necessary for the interference-protected terminal device to perform interference suppression operations when performing in-band full-duplex communication. This interference information corresponds, for example, to the amount of interference received from within its own cell and the amount of interference received from other cells when a certain interference-protected terminal device performs in-band full-duplex communication, as well as the packet error rate for the MCS (Modulation and Coding Scheme) when actually performing in-band full-duplex communication. In addition, the interference information corresponds, for example, to the ratio of noise signals to received signals of the interference-protected terminal device and information related to QoS. Base station device 20A requests terminal device 40A to generate interference information (step S111).

Next, the terminal device 40A measures the amount of interference described above and generates interference information. Note that information measured at the time of detecting the interference protection terminal device can also be applied to the interference information. Next, the base station device 20A acquires interference information from the terminal device 40A (step S112). When acquiring this interference information, the base station device 20A can also collect location information and sector information of the base station device 20A.

Next, the base station device 20A determines the interference area 190 based on the interference information (step S113). This interference region 190 can be determined based on any or a combination of the following criteria.
(a) A certain range from all interference-protected terminal devices (b) A range that includes terminal devices that may cause interference around the interference-protected terminal device (c) A combined sector area where interference-protected terminal devices are located (d ) Interference protection Combines the sector areas of terminal equipment that can cause interference around the terminal equipment.

These ranges may be defined in advance by standards, or may be determined depending on the interference situation. Further, a plurality of interference regions may be defined within the area covered by a single base station device 20. An ID is assigned to the terminal device 40 within the interference region 190 in order to identify it as a terminal device 40 existing in the interference region 190. This ID may be defined as new information or may be defined as a combination of existing area information. For example, the base station device 20A defines terminal devices having multiple zone IDs as terminal devices within the interference area 190 by combining the zone ID of the adjacent base station device 20 and its own zone ID. .

[Interference suppression operation]
The interference suppression operations that the base station apparatus 20 requests from the interfering terminal apparatus 40 (interfering terminal apparatus) include, for example, suppressing the transmission power of the interfering terminal apparatus, stopping transmission of the interfering terminal apparatus, and suppressing all interference within the band of the interfering terminal apparatus. This includes stopping heavy communication and changing radio resources used by interfering terminal devices. When the interfering terminal changes the radio resources, the base station devices 20 agree on the radio resources to be changed in advance. This can be done by signaling. Furthermore, the base station device 20 can also transmit a signal requesting interference suppression operation based on a request from an interference protection terminal that performs in-band full-duplex communication. The base station device 20 may also receive a request signal from the base station device 20 of another cell and transmit a signal requesting interference suppression to the terminal device under its control. Further, these signals requesting interference suppression can be transmitted as physical layer control signals via the PDCCH. Further, the signal requesting interference suppression can also be transmitted as MAC or RRC layer control information via the PDSCH.

At this time, what kind of interference suppression operation the base station device 20 requests can be determined based on the amount of interference received from the surrounding terminal devices 40 and the amount of allowable interference measured when determining the interference area 190. can.

[Interference suppression procedure]
FIG. 9 is a diagram illustrating an example of a processing procedure of interference suppression processing according to an embodiment of the present disclosure. This figure is a sequence diagram showing the procedure of the interference suppression operation in the terminal device 40B based on the notification of the interference suppression operation from the base station device 20A.

The base station device 20A allocates radio resources to the terminal device 40A (step S211). This is a processing procedure corresponding to step S103 in FIG. Next, the base station device 20A notifies the terminal device 40B, which is the interfering terminal device, of the interference suppression operation (step S212). This is a processing procedure corresponding to step S104 in FIG. Next, the terminal device 40B performs an interference suppression operation based on the notification of the interference suppression operation (step S213). Through the above processing procedure, the terminal device 40B can perform an interference suppression operation and suppress interference with the downlink communication of the terminal device 40A.

Note that the terminal device 40B can select the interference suppression operation based on the amount of allowable interference measured in advance. As described above, the interference suppression operation is one of transmission power suppression, transmission stop, determination of whether or not to perform in-band full-duplex communication, and request to cancel in-band full-duplex communication. This interference suppression operation may be requested by the terminal device 40B itself, or may be requested by the base station device 20A or the terminal device 40 of another cell. At this time, the target for requesting the above-mentioned interference suppression operation is the terminal device 40 in the area or sector around the terminal device 40 that performs the preset in-band full-duplex communication. The range of this region or sector may be determined by a range defined by a plurality of zone IDs, and the range of the region or sector may be determined based on the QoS of the signal that may be transmitted by the terminal device 40 itself that performs in-band full-duplex communication. may be determined.

A method for measuring the amount of allowable interference in the terminal device 40 will be explained. This measurement of the allowable amount of interference is performed for the terminal device 40 that performs in-band full-duplex communication. The allowable amount of interference can be measured based on the amount of interference measured by the aforementioned terminal-to-terminal interference (CLI). This measurement is performed on a region or sector basis. This measurement is triggered by the base station device 20. The base station device 20 transmits a signal containing information requesting an operation for measuring the amount of allowable interference to the terminal device 40A and the terminal device 40B. The terminal device 40A that has received the signal storing information requesting an operation for measuring the amount of allowable interference waits until it receives a known signal for measuring interference transmitted from another terminal device. On the other hand, the terminal device 40B, which has received the signal storing the information requesting the operation for measuring the amount of allowable interference, transmits a known signal for measuring the interference. The terminal device 40A that has received the known signal for interference measurement notifies the base station device 20 of the amount of interference that it has measured. At this time, a plurality of terminals within a sector or area may simultaneously transmit a signal containing information requesting an operation for measuring the amount of allowable interference. Based on this measurement result, the allowable amount of interference for in-band full-duplex communication is calculated.

[Other communication control processing]
FIG. 10 is a diagram illustrating another example of the processing procedure of communication control processing according to the embodiment of the present disclosure. Similar to FIG. 6, this figure is a flowchart illustrating an example of the processing procedure of communication processing of the base station device 20A. The process in the figure is a process when the interference protection terminal device (terminal device 40A) actually starts in-band full-duplex communication after detecting the interference protection terminal device.

First, the base station device 20A determines whether the terminal device 40A performs in-band full-duplex communication (step S131). As a result, if the terminal device 40A does not perform in-band full-duplex communication (step S131, No), the base station device 20A ends the process. On the other hand, when the terminal device 40A performs in-band full-duplex communication (step S131, Yes), the base station device 20A determines whether to update the interference region 190 (step S132). For example, when the interference situation changes due to movement of the terminal device 40A, which is an interference protection terminal, or the surrounding terminal devices 40, it is necessary to update the interference area 190.

If the interference region 190 is not updated (step S132, No), the base station device 20A moves to the process of step S133. On the other hand, when updating the interference region 190 (step S132, Yes), the base station device 20A performs interference region detection (step S110), and proceeds to the process of step S133. In step S133, the base station device 20A performs radio resource allocation (step S133) and notifies interference suppression operation (step S134).

In this way, the communication system 1 according to the embodiment of the present disclosure detects the interference region 190 that includes interfering terminals of other cells. Then, when the terminal device 40A performs in-band full-duplex communication, the base station device 20A causes other terminal devices 40 included in the interference area to perform an interference suppression operation. Thereby, the procedure for in-band full-duplex communication of the terminal device 40A can be simplified.

(Other variations)
The control device that controls the base station device 20 and the terminal device 40 of this embodiment may be realized by a dedicated computer system, or may be realized by a general-purpose computer system.

For example, a communication program for executing the above operations is stored and distributed in a computer-readable recording medium such as an optical disk, semiconductor memory, magnetic tape, or flexible disk. Then, for example, the program is installed on a computer and the control device is configured by executing the above-described processing. At this time, the control device may be a device (for example, a personal computer) external to the base station device 20 and the terminal device 40. Further, the control device may be a device inside the base station device 20 and the terminal device 40 (for example, the control unit 24 and the control unit 45).

Furthermore, the communication program may be stored in a disk device included in a server device on a network such as the Internet, so that it can be downloaded to a computer. Furthermore, the above-mentioned functions may be realized through collaboration between an OS (Operating System) and application software. In this case, the parts other than the OS may be stored on a medium and distributed, or the parts other than the OS may be stored in a server device so that they can be downloaded to a computer.

Further, among the processes described in the above embodiments, all or part of the processes described as being performed automatically can be performed manually, or the processes described as being performed manually can be performed manually. All or part of this can also be performed automatically using known methods. In addition, information including the processing procedures, specific names, and various data and parameters shown in the above documents and drawings may be changed arbitrarily, unless otherwise specified. For example, the various information shown in each figure is not limited to the illustrated information.

Furthermore, each component of each device shown in the drawings is functionally conceptual, and does not necessarily need to be physically configured as shown in the drawings. In other words, the specific form of distributing and integrating each device is not limited to what is shown in the diagram, and all or part of the devices can be functionally or physically distributed or integrated in arbitrary units depending on various loads and usage conditions. Can be integrated and configured. Note that this distribution/integration configuration may be performed dynamically.

Furthermore, the above-described embodiments can be combined as appropriate in areas where the processing contents do not conflict. Moreover, the order of each step shown in the flowchart of the above-described embodiment can be changed as appropriate.

Further, for example, the present embodiment applies to any configuration constituting a device or system, such as a processor as a system LSI (Large Scale Integration), a module using multiple processors, etc., and a unit using multiple modules. Furthermore, it can also be implemented as a set (that is, a partial configuration of the device) with additional functions.

Note that in this embodiment, a system means a collection of multiple components (devices, modules (components), etc.), and it does not matter whether all the components are in the same housing or not. Therefore, multiple devices housed in separate casings and connected via a network, and a single device with multiple modules housed in one casing are both systems. .

Furthermore, for example, the present embodiment can take a cloud computing configuration in which one function is shared and jointly processed by a plurality of devices via a network.

Although each embodiment of the present disclosure has been described above, the technical scope of the present disclosure is not limited to each of the above-described embodiments as is, and various changes can be made without departing from the gist of the present disclosure. be. Furthermore, components of different embodiments and modifications may be combined as appropriate.

Note that the series of processes performed by each device described in this specification may be realized using software, hardware, or a combination of software and hardware. The programs constituting the software are stored in advance in, for example, a storage medium (non-transitory media) provided inside or outside each device. For example, each program is read into a RAM when executed by a computer, and executed by a processor such as a CPU.

Furthermore, the processes described using flowcharts and sequence diagrams in this specification do not necessarily have to be executed in the order shown. Some processing steps may be performed in parallel. Also, additional processing steps may be employed or some processing steps may be omitted.

Note that the effects described in this specification are merely examples and are not limiting, and other effects may also exist.

Note that the present technology can also have the following configuration.
(1)
In a communication system that performs in-band full-duplex communication, it includes terminal devices in other cells that cause interference with uplink communication transmission signals in the same frequency band to terminal devices that perform downlink communication with their own base station equipment. A base station device comprising a control unit that performs control to detect an interference region, which is a region, and control to cause other terminal devices included in the interference region to perform an interference suppression operation.
(2)
The base station device according to (1), wherein the control unit performs control to detect the interference area based on interference information that is information about interference that the terminal device receives from the terminal device of the other cell.
(3)
The base station apparatus according to (2), wherein the interference information includes an amount of interference that the terminal apparatus receives from the terminal apparatus of the other cell.
(4)
The base station device according to (2), wherein the interference information includes a packet error rate during in-band full-duplex communication of the terminal device.
(5)
The base station device according to (2), wherein the interference information includes a ratio of a noise signal to a received signal of the terminal device.
(6)
The base station device according to (2), wherein the interference information includes information regarding QoS of the terminal device of the other cell.
(7)
The base station device according to (2), wherein the control unit further controls the terminal device to generate the interference information, and detects the interference area based on the interference information generated by the terminal device.
(8)
The base station device according to (1), wherein the control unit performs suppression of transmission power as the interference suppression operation.
(9)
The base station device according to (1), wherein the control unit causes the interference suppression operation to be a stop of transmission.
(10)
The base station device according to (1), wherein the control unit causes the interference suppression operation to be a stop of in-band full-duplex communication.
(11)
The base station device according to (1), wherein the control unit causes the interference suppression operation to be a change in radio resources to be used.
(12)
In a communication system that performs in-band full-duplex communication, an area that includes terminal equipment that causes interference with uplink communication transmission signals in the same frequency band to terminal equipment in other cells that perform downlink communication with the base station equipment. A terminal device disposed in a certain interference area, the terminal device having a control unit that performs an interference suppression operation based on a notification from the base station device.
(13)
In a communication system that performs in-band full-duplex communication, it includes terminal devices in other cells that cause interference with uplink communication transmission signals in the same frequency band to terminal devices that perform downlink communication with their own base station equipment. detecting an interference region that is a region;
A communication control method comprising: causing another of the terminal devices included in the interference area to perform an interference suppression operation.
(14)
In a communication system that performs in-band full-duplex communication, an area that includes terminal equipment that causes interference with uplink communication transmission signals in the same frequency band to terminal equipment in other cells that perform downlink communication with the base station equipment. A communication control method comprising performing an interference suppression operation based on a notification from the base station device when the base station device is located in a certain interference area.

1

Communication System

20, 20A, 20B

Base Station Device

24, 45

Control Unit

40, 40A, 40B Terminal Device 190 Interference Area

Claims

In a communication system that performs in-band full-duplex communication, it includes terminal devices in other cells that cause interference with uplink communication transmission signals in the same frequency band to terminal devices that perform downlink communication with their own base station equipment. A base station device comprising a control unit that performs control to detect an interference region, which is a region, and control to cause other terminal devices included in the interference region to perform an interference suppression operation.
The base station device according to claim 1, wherein the control unit performs control to detect the interference area based on interference information that is information about interference that the terminal device receives from a terminal device in the other cell.
The base station apparatus according to claim 2, wherein the interference information includes an amount of interference that the terminal apparatus receives from a terminal apparatus of the other cell.
The base station device according to claim 2, wherein the interference information includes a packet error rate during in-band full-duplex communication of the terminal device.
The base station device according to claim 2, wherein the interference information includes a ratio of a noise signal to a received signal of the terminal device.
The base station device according to claim 2, wherein the interference information includes information regarding QoS of the terminal device of the other cell.
The base station device according to claim 2, wherein the control unit further controls the terminal device to generate the interference information, and detects the interference area based on the interference information generated by the terminal device.
The base station apparatus according to claim 1, wherein the control unit makes suppression of transmission power the interference suppression operation.
The base station device according to claim 1, wherein the control unit makes stopping transmission the interference suppression operation.
The base station device according to claim 1, wherein the control unit causes the interference suppression operation to be a stop of in-band full-duplex communication.
The base station apparatus according to claim 1, wherein the control unit causes the interference suppression operation to be a change in radio resources to be used.
In a communication system that performs in-band full-duplex communication, an area that includes terminal equipment that causes interference with uplink communication transmission signals in the same frequency band to terminal equipment in other cells that perform downlink communication with the base station equipment. A terminal device disposed in a certain interference area, the terminal device having a control unit that performs an interference suppression operation based on a notification from the base station device.
In a communication system that performs in-band full-duplex communication, it includes terminal devices in other cells that cause interference with uplink communication transmission signals in the same frequency band to terminal devices that perform downlink communication with their own base station equipment. detecting an interference region that is a region;
A communication control method comprising: causing another of the terminal devices included in the interference area to perform an interference suppression operation.
In a communication system that performs in-band full-duplex communication, an area that includes terminal equipment that causes interference with uplink communication transmission signals in the same frequency band to terminal equipment in other cells that perform downlink communication with the base station equipment. A communication control method comprising performing an interference suppression operation based on a notification from the base station device when the base station device is located in a certain interference area.