Base station, system and communication method

Abstract

A base station (10A) controls the start time of a first measurement related to a first wireless connection for a terminal (20) based on an instruction related to measurement. In addition, the base station (10A) sends time information indicating the start time of the first measurement to another base station (10B) that performs a second measurement related to a second wireless connection for the terminal (20).

Description

Technical Field

[0001] The present disclosure relates to a base station. Background Art

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high-speed data rate, low latency, etc. In addition, the successor systems of LTE are also being studied for the purpose of further broadband and high-speed of LTE. Among the successor systems of LTE, for example, there are systems called Long Term Evolution Technology Upgrade (LTE-Advanced (LTE-A)), Future Radio Access (Future Radio Access (FRA)), 5th generation mobile communication system (5G), 5G+ (5G plus), Radio Access Technology (Radio Access Technology (New-RAT)), New Radio (New Radio (NR)), etc.

[0003] Prior art literature

[0004] Non-patent literature

[0005] Non-patent document 1: 3GPP TS 36.314 V15.2.0 (2018-12)

[0006] Non-patent document 2: 3GPP TR 37.816 V16.0.0 (2019-07)

[0007] Non-patent document 3: 3GPP TS 32.422 V15.2.0 (2019-06)

[0008] Non-patent document 4: 3GPP TS 36.423 V15.7.0 (2019-09) Summary of the invention

[0009] Problems to be solved by the invention

[0010] In LTE, layer 2 (L2) measurement (L2 measurement) for measuring specific parameters indicating channel status is defined (see Non-Patent Document 1).

[0011] In NR, discussions related to L2 measurement are also being conducted (see Non-Patent Document 2). In addition, dual connectivity (DC) is also introduced in NR.

[0012] However, there is still room for research on issues related to L2 measurement in DC.

[0013] One of the objectives of the present disclosure is to improve L2 measurements in DC.

[0014] Means for solving problems

[0015] A base station involved in one embodiment of the present invention comprises: a control unit, which controls the start time of a first measurement related to a first wireless connection for a terminal based on an instruction related to the measurement; and a sending unit, which sends the time information indicating the start time of the first measurement to other base stations that perform a second measurement related to a second wireless connection for the terminal.

[0016] Effects of the Invention

[0017] According to the present disclosure, L2 measurement in DC can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a block diagram showing an example of the structure of a base station.

[0019] Figure 2 This is a block diagram showing an example of the structure of a terminal.

[0020] Figure 3 This is a diagram showing an example of the configuration of a wireless communication system.

[0021] Figure 4 This is a diagram showing an example of the hardware configuration of a base station and a terminal. DETAILED DESCRIPTION

[0022] <Background Knowledge for this Disclosure>

[0023] (Background 1)

[0024] In conventional LTE L2 measurements, the following parameters are measured (see Non-Patent Document 1).

[0025] PRB usage

[0026] Number of active UEs

[0027] Packet delay

[0028] Data loss

[0029] Scheduled IP Throughput

[0030] Scheduled IP Throughput for MDT

[0031] Data volume

[0032] Data volume for shared networks

[0033] Distribution of PRB usage

[0034] Distribution of scheduled IP throughput

[0035] Among these, four parameters, namely, scheduled IP throughput, scheduled IP throughput for MDT, data volume, and allocation of scheduled IP throughput, are measured for each UE.

[0036] In addition, PRB is the abbreviation of physical resource block(s), UE is the abbreviation of user equipment, IP is the abbreviation of Internet protocol, and MDT is the abbreviation of minimization of drive tests.

[0037] (Background 2)

[0038] In 3GPP RAN2 SON / MDT WI, matters related to L2 measurement are discussed. In addition, SON is an abbreviation for self-management networks, and WI is an abbreviation for working item.

[0039] For example, in Chapter 6.2.2 “L2 measurement quantities” of Non-Patent Document 2, the matter of introducing the following parameter measurements in NR is studied.

[0040] Received random access preambles

[0041] Number of users for RRC_CONNECTED

[0042] Number of users for RRC_INACTIVE

[0043] In addition, in Chapter 6.2.2 "L2 measurement quantities" of Non-Patent Document 2, for the measurement of the following parameters, it is also studied to use the measurement defined in SA5 instead of the measurement defined in Non-Patent Document 1. SA5 is an abbreviation for system aspects group 5.

[0044] PRB usage

[0045] Packet delay

[0046] Data loss

[0047] Scheduled IP Throughput

[0048] Scheduled IP Throughput for MDT

[0049] Data volume

[0050] Distribution of scheduled IP throughput

[0051] (Background 3)

[0052] In NR, DC is introduced to enable the master node (MN) and the slave node (SN) to be connected to the UE at the same time.

[0053] In the DC state, the start of L2 measurement is triggered from the upper node (such as MME or AMF) to the MN. MME is the abbreviation of mobility management entity, and AMF is the abbreviation of access and mobility management function.

[0054] The triggering of L2 measurement for MN may use a Trace Start message (hereinafter referred to as "first message") The first message is sent from the upper node to the MN via an interface labeled S1-MME or ng-C.

[0055] The first message includes the following parameters (refer to Chapter 4.1.2.12.3 “Activation of MDT task after UE attachment” of Non-Patent Document 3).

[0056] Area scope (TA, Cell)

[0057] Trace Reference

[0058] Trace Recording Session Reference

[0059] List of measurements

[0060] Reporting Trigger

[0061] Report Amount

[0062] Report Interval

[0063] Event Threshold

[0064] Logging Interval

[0065] Logging Duration

[0066] IP address of Trace Collection Entity

[0067] LTE measurement period (Measurement period LTE)

[0068] Positioning method

[0069] Collection period for RRM measurementsLTE

[0070] MDT PLMN List

[0071] In addition, PLMN is the abbreviation of Public Land Mobile Network.

[0072] When starting L2 measurement, the MN notifies the SN of a trace start message (hereinafter referred to as "second message") (see Chapter 9.1.4.28 "TRACE START" of Non-Patent Document 4). The notification of the second message may use, for example, an interface labeled Xn-C.

[0073] The Trace Activation instruction of the second message includes MDT configuration information. In the MDT configuration information, the measurement parameters of M1 to M5 (refer to 5.10.3 List of measurements in non-patent document 3) are represented by a bitmap (refer to Chapter 9.2.56 "MDT Configuration" in non-patent document 4). Among M1 to M5, M4 and M5 are L2 measurement parameters.

[0074] M1: RSRP and RSRQ measurement based on UE

[0075] M2: Power Headroom (PH) measurement based on UE

[0076] M3: Received interference power measurement based on base station

[0077] M4: Data volume measurement based on DL and UL data volumes of other base stations

[0078] M5: Other scheduled IP throughput measurement based on DL and UL of the base station (scheduled IP throughput measurement)

[0079] In addition, MAC is the abbreviation of medium access control, DL is the abbreviation of downlink, and UL is the abbreviation of uplink. RSRP is the abbreviation of reference signal received power, and RSRQ is the abbreviation of reference signal received quality.

[0080] For the above four parameters measured by each UE, there is still room for research on the method of synchronizing the measurement timing between MN and SN and the method of comparing the measurement results between MN and SN. In addition, the term "comparison" can also be interchanged with terms such as matching, mapping, and alignment.

[0081] Here, "comparison" has an important meaning in the following viewpoints. The measurement subjects are MN and SN, and their measurement objects are each UE. That is, when both MN and SN measure one UE, by comparing the measurement results of MN and SN, there is an advantage of being able to grasp the reliability of the measurement results. For example, if the comparison result confirms inconsistency, it is determined that some kind of failure occurred in the measurement process of MN and SN, and it is possible that the measurement results will not be used and / or stored.

[0082] This embodiment proposes a case related to the above-mentioned research scope.

[0083] The following description will be made of the embodiments with appropriate reference to the accompanying drawings. The same elements throughout the specification are assigned the same figure numbers unless otherwise specified. The accompanying drawings and the matters described below are used to illustrate exemplary embodiments and are not used to represent the only embodiments. For example, when representing the order of operations in the present embodiment, the order of operations may be appropriately changed within the scope of the overall operation without contradiction.

[0084] When representing multiple embodiments and / or variations, a part of the structure, function and / or operation of an embodiment and / or variation may be included in other embodiments and / or variations, or may be replaced by the corresponding structure, function and / or operation of other embodiments and / or variations, within the scope without contradiction.

[0085] In addition, in the embodiments, there are cases where detailed descriptions other than necessary are omitted. For example, in order to avoid making the description unnecessarily lengthy and / or the technical solution or concept obscure so as to make it easier for those skilled in the art to understand, there are cases where detailed descriptions of well-known or well-known technical solutions are omitted. In addition, there are cases where repeated descriptions related to substantially the same structure, function and / or operation are omitted.

[0086] The accompanying drawings and the following description are provided to help understand the embodiments and are not intended to limit the subject matter described in the claims. In addition, in order to help those skilled in the art understand, the terms used in the following description may also be appropriately replaced with other terms.

[0087] <Structure of base station>

[0088] Figure 1 It is a block diagram showing an example of the structure of the base station 10. The base station 10 can be equivalent to either an eNB (LTE base station) or a gNB (NR base station). The base station 10 can be connected to other base stations through an inter-base station interface. In addition, the base station 10 can also be connected to an upper node. MME / AMF and TCE can be cited as examples of upper nodes. In addition, TCE is an abbreviation for trace collection entity. "MME / AMF" is a convenient mark used to represent at least one of MME and AMF.

[0089] In addition, the base station 10 may also be connected to a management system such as EMS. In addition, EMS is the abbreviation of element management system.

[0090] In other words, the base station 10 can communicate with the terminal (UE) 20 (refer to Figure 2 ), communicate with at least one of other base stations 10, MME / AMF, TCE and EMS.

[0091] For example, the communication between the base station 10 and the terminal 20 may be wireless communication. The communication between the base station 10 and at least one of the MME / AMF, TCE and EMS may be either wired communication or wireless communication.

[0092] like Figure 1 As shown, the base station 10 includes, for example, a sending unit 101 , a receiving unit 102 and a control unit 103 .

[0093] The transmitting unit 101 transmits a downlink (DL) signal to the terminal 20. For example, under the control of the control unit 103, the transmitting unit 101 transmits the DL signal. For example, the DL signal may include scheduling information related to the signal transmission of the terminal 20 (for example, uplink permission (UL grant)), and may also include control information (for example, DCI (Downlink Control Information)). In addition, the DL signal may also include information about measurements related to the wireless connection between the base station 10 and the terminal 20 (for example, layer 2 (L2) measurements) (for example, information related to control or instructions).

[0094] In addition, for example, the transmission unit 101 may transmit (report) the result of the L2 measurement to at least one of the upper node, other base stations 10 and the EMS.

[0095] In addition, for example, when the L2 measurement is triggered (or set, activated, or initiated) by the upper node to the base station 10, the sending unit 101 may send time information indicating the start time of the L2 measurement to other base stations 10. The "time information indicating the start time of the L2 measurement" may also be replaced by "information indicating the start timing of the L2 measurement".

[0096] The time information indicating the start time of the L2 measurement (hereinafter referred to as "L2 measurement time information") may include, for example, a signal (or message) for triggering the L2 measurement. Alternatively, the time information indicating the start time of the L2 measurement may be pre-configured in the base station 10 (for example, the control unit 103).

[0097] The receiving unit 102 receives an uplink (UL) signal transmitted by the terminal 20. For example, based on the control of the control unit 103, the receiving unit 102 receives the UL signal.

[0098] In addition, for example, the receiving unit 102 may receive a signal for triggering L2 measurement from a higher-level node, or may receive L2 measurement results (L2 measurement reports) performed by other base stations 10 .

[0099] The control unit 103 controls the communication operation of the base station 10 , which includes the transmission process of the transmission unit 101 and the reception process of the reception unit 102 .

[0100] For example, the control unit 103 receives data and control information from the upper layer, and outputs it to the transmission unit 101. In addition, the control unit 103 outputs data and control information received from the reception unit 102 to the upper layer.

[0101] In addition, the control unit 103 may also perform control related to L2 measurement (e.g., control of the start time of L2 measurement) for each terminal 20 connected to the base station 10 based on the L2 measurement time information (or, according to the L2 measurement time information). The control unit 103 may also generate, for example, a report (L2 measurement report) containing the results of the implemented L2 measurement. For example, the generated L2 measurement report may be generally sent from the sending unit 101 to at least one of the upper node, other base stations 10, and the EMS as described above.

[0102] <Terminal Structure>

[0103] Figure 2 2 is a block diagram showing an example of the configuration of the terminal 20. For example, the terminal 20 includes a receiving unit 201, a transmitting unit 202, and a control unit 203. For example, the terminal 20 communicates with the base station 10 in a wireless manner.

[0104] The receiving unit 201 receives a DL signal transmitted by the base station 10. For example, under the control of the control unit 203, the receiving unit 201 receives the DL signal.

[0105] The transmitting unit 202 transmits a UL signal to the base station 10. For example, under the control of the control unit 203, the transmitting unit 202 transmits the UL signal. For example, the UL signal may include a result of measurement based on the terminal 20 (e.g., the control unit 203). Exemplarily, the measurement based on the terminal 20 may include at least one of a measurement related to RSRP and RSRQ and a measurement related to power headroom (PH).

[0106] The control unit 203 controls the communication operation of the terminal 20, which includes the reception processing in the reception unit 201 and the transmission processing in the transmission unit 202. For example, the control unit 203 receives data and control information from the upper layer and outputs it to the transmission unit 202. In addition, for example, the control unit 203 outputs the data and control information received from the reception unit 201 to the upper layer.

[0107] In addition, for example, the control unit 203 performs control related to measurement based on the terminal 20. The measurement based on the terminal 20 can be performed periodically or aperiodically. For example, aperiodic measurement can also be performed according to an instruction sent by the base station 10.

[0108] <System configuration example>

[0109] Figure 3 1 is a diagram showing an example of the structure of the wireless communication system 1. For example, Figure 3 The wireless communication system 1 shown (hereinafter simply referred to as “system 1 ”) includes a master node (MN) 10A, a slave node (SN) 10B, and a terminal (UE) 20 .

[0110] An example of the structure of MN10A and SN10B can be Figure 1 In other words, one of MN10A and SN10B may be equivalent to the first base station, and the other of MN10A and SN10B may be equivalent to the second base station. In addition, in system 1, the number of UE20 may be more than 2, and the number of base stations may be more than 3.

[0111] In addition, MN10A and SN10B may be equivalent to one of the eNB and gNB. For example, both MN10A and SN10B may be equivalent to one of the eNB and gNB, or one of MN10A and SN10B may be equivalent to the eNB and the other of MN10A and SN10B may be equivalent to the gNB. UE20 may establish wireless connections with both MN10A and SN10B at the same time through DC.

[0112] In addition, if Figure 3 As shown, the system 1 may include MME / AMF 30, TCE 40-1 and TCE 40-2 as an example of an upper node. In addition, for example, the system 1 may also include EMS 50-1 and 50-2.

[0113] For example, the MME / AMF 30 is connected to the MN 10A via a wired or wireless connection. For example, the TCE 40 - 1 is connected to the MN 10A via a wired or wireless connection.

[0114] For example, TCE 40 - 2 is connected to SN 10B by wire or wirelessly. In other words, TCE 40 - 1 and 40 - 2 are respectively set to correspond to MN 10A and SN 10B.

[0115] For example, the EMS 50 - 1 manages the MN 10A, the MME / AMF 30 and the TCE 40 - 1. Therefore, for example, the EMS 50 - 1 may be connected with the MN 10A, the MME / AMF 30 and the TCE 40 - 1 by wire or wirelessly.

[0116] For example, EMS 50 - 2 manages SN 10B and TCE 40 - 2. Therefore, for example, EMS 50 - 2 may be connected to SN 10B and TCE 40 - 2 by wire or wirelessly.

[0117] <Proposal>

[0118] Next, a proposal for improving L2 measurement in DC is described.

[0119] (Proposal 1)

[0120] As Proposal 1, Figure 3 In the DC state shown, as a trigger for starting L2 measurement, the first message notified from the upper node (e.g., MME or AMF30) to MN10A includes a parameter for the logging start time (Logging StartTime) of the L2 measurement. In addition, the second message (e.g., MDT setting information) includes a parameter for the logging start time of the L2 measurement. In addition, the second message (e.g., MDT setting message) may also include information or parameters indicating one or both of the logging interval and the logging period.

[0121] MN10A performs L2 measurement on UE20 based on the time information of the log start time parameter of the first message notified by the upper node. In addition, SN10B performs L2 measurement on UE20 based on the time information of the log start time parameter of the second message notified by MN10A. In addition, MN10A and SN10B record the log timestamp in response to the start of L2 measurement.

[0122] According to Proposal 1, MN10A and SN10B are able to perform L2 measurement simultaneously, so L2 measurement in DC can be improved.

[0123] Furthermore, for example, the time information may be expressed as an absolute time such as XX hours, YY minutes, and ZZ seconds, or as a relative time (eg, an offset of several minutes or seconds) based on the timing of receiving the information.

[0124] When the absolute time is used, even when the time synchronization between MN10A and SN10B cannot be guaranteed, the start time of measurement of MN10A and SN10B can be correctly aligned (in other words, synchronized). In addition, when the absolute time is used, even if there is a propagation delay between MN10A and SN10B, the start time of measurement of MN10A and SN10B can be correctly aligned.

[0125] On the other hand, when ensuring time synchronization between MN10A and SN10B, using relative time (offset) can reduce the amount of information in the notification sent by MN10A to SN10B compared to using absolute time.

[0126] (Proposal 2)

[0127] As proposal 2, time information indicating the start time of tracking the L2 measurement is pre-configured for MN10A and SN10B. In this case, MN10A starts L2 measurement at the start time indicated by the preset time information, triggered by the reception of the first message. Similarly, SN10B starts L2 measurement at the start time indicated by the preset time information, triggered by the reception of the second message. In addition, MN10A and SN10B record a log timestamp in response to the start of the L2 measurement.

[0128] According to Proposal 2, MN10A and SN10B are able to perform L2 measurement synchronously, thereby improving L2 measurement in DC.

[0129] In addition, Proposal 2 can be combined with Proposal 1. For example, SN10B can start L2 measurement at the candidate start time that is closest to the time information of the log start time parameter received from MN10A among the preset candidate start times of L2 measurement. In the case where the candidate start time that is closest to the time information of the log start time parameter received from MN10A cannot be determined, SN10B can either ignore the time information received from MN10A or determine it to be invalid.

[0130] In this case, SN10B may also record information indicating that the candidate start time is ignored, determined to be invalid, or cannot be determined as a measurement result. For example, in the comparison tracking report, it is easy to confirm whether there is a mismatch based on the record.

[0131] (Proposal 3)

[0132] For example, MN10A and SN10B may report the L2 measurement results to TCE40-1 and 40-2 corresponding to MN10A and SN10B respectively according to the trace report. TCE40-1 and 40-2 receiving the trace report compare the L2 measurement results using UE ID and log start time or log timestamp.

[0133] In addition, SN10B sends measurement results (tracking reports) to MN10A (refer to Figure 3 ), MN10A may also use UE ID and log start time or log timestamp to compare the tracking report, integrate the L2 measurement result of each UE and report it to TCE40-1 corresponding to MN10A.

[0134] According to Proposal 3, TCE 40, which is an example of an upper node, can easily determine whether the L2 measurement of MN 10A and the L2 measurement of SN 10B are performed synchronously, thereby improving the L2 measurement in DC.

[0135] In addition, the tracking report can be reported by MN10A or SN10B directly to TCE40-1 or 40-2, or by MN10A or SN10B to TCE40-1 or 40-2 through EMS50-1 or 50-2.

[0136] (Hardware Structure)

[0137] In addition, the block diagram used in the description of the above-mentioned embodiment shows the block of the functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, wired, wireless, etc.) connected and implemented using the multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0138] Functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconstructing, allocating, mapping, assigning, etc., but are not limited thereto. For example, a functional block (structural unit) that performs the function of sending may also be referred to as a transmitting unit or a transmitter. As described above, the implementation method is not particularly limited.

[0139] For example, a base station, a terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 4 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0140] In the following description, the expression "device" can be replaced by circuit, equipment, unit, etc. The hardware configuration of the base station 10 and the terminal 20 may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0141] The various functions in the base station 10 and the terminal 20 are achieved, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, and the processor 1001 performs calculations to control communication via the communication device 1004, or control at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0142] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a computing device, registers, etc. For example, the control unit 103 and the control unit 203 described above may also be implemented by the processor 1001.

[0143] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes according to them. As a program, a program that enables a computer to perform at least a part of the operation described in the above-mentioned embodiment is used. For example, the control unit 103 of the base station 10 or the control unit 202 of the terminal 20 can also be implemented by a control program stored in the memory 1002 and operated by the processor 1001, and the same can be implemented for other functional blocks. The above-mentioned various processing instructions are executed by one processor 1001, but can also be executed simultaneously or sequentially by more than two processors 1001. The processor 1001 can also be installed by more than one chip. It should be noted that the program can also be sent by the network via an electrical communication line.

[0144] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), etc. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 may store a program (program code), a software module, etc. that can be executed to implement the wireless communication method involved in one embodiment of the present disclosure.

[0145] The storage 1003 is a computer-readable recording medium, and may be composed of at least one of a compact disk (such as an optical disk such as a CD-ROM (CompactDisc ROM), a hard disk drive, a floppy disk, an optical disk (such as a compressed disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (such as a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned storage medium may also be other appropriate media such as a database, a server, etc. that includes at least one of the memory 1002 and the storage 1003.

[0146] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. In order to implement, for example, at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the transmitting unit 101, the receiving unit 102, the receiving unit 201, and the transmitting unit 202, etc., may also be implemented by the communication device 1004.

[0147] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that performs output to the outside (e.g., a display, a speaker, an LED light, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0148] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or different buses between the devices.

[0149] In addition, the base station 10 and the terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and may implement a part or all of each functional block through the hardware. For example, the processor 1001 may also be installed using at least one of these hardware.

[0150] (Information notification, signaling)

[0151] The notification of information is not limited to the methods / implementations described in the present disclosure, and other methods may also be used. For example, the notification of information may also be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), high-level signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, and may also be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0152] (Application System)

[0153] The various schemes / implementations described in the present disclosure may also be applied to systems utilizing LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other appropriate systems, and at least one of the next generation systems extended based on them. In addition, multiple systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G, etc.).

[0154] (Processing process, etc.)

[0155] The processing procedures, timings, flow charts, etc. of each scheme / implementation described in this disclosure may be reversed in order as long as they are not contradictory. For example, for each method described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0156] (Base Station Operation)

[0157] In the present disclosure, a specific operation set to be performed by a base station may sometimes be performed by its upper node depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed to communicate with a terminal may be performed by at least one of the base station and other network nodes other than the base station (for example, consider MME or S-GW, etc., but not limited to these). In the above, the case where there is one other network node other than the base station is illustrated, but it may also be a combination of multiple other network nodes (for example, MME and S-GW).

[0158] (Direction of input and output)

[0159] Information, etc. (※Refer to the item "Information, Signal") can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or can be input and output via a plurality of network nodes.

[0160] (Processing of input and output information, etc.)

[0161] The input and output information can be stored in a specific location (e.g., a memory) or managed using a management table. The input and output information can be rewritten, updated, or added. The output information can also be deleted. The input information can also be sent to other devices.

[0162] (Judgment method)

[0163] The determination may be made based on a value represented by one bit (0 or 1), based on a truth value (Boolean value: true or false), or by comparing numerical values ​​(for example, comparing with a specific value).

[0164] (software)

[0165] Whether software is referred to as software, firmware, middleware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, executable threads, procedures, functions, etc.

[0166] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0167] (Information, signal)

[0168] Information, signals, etc. described in this disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0169] In addition, the various terms described in the present disclosure and the terms required to understand the present disclosure may also be replaced with terms having the same or similar meanings. For example, at least one of a channel and a code element may also be a signal (signaling). In addition, a signal may also be a message. In addition, a component carrier (CC) may also be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0170] (“System”, “Network”)

[0171] As used in this disclosure, the terms "system" and "network" may be used interchangeably.

[0172] (parameters, channel name)

[0173] In addition, each information, parameter, etc. described in the present disclosure may be expressed by an absolute value, a relative value relative to a specific value, or another corresponding information. For example, a wireless resource may also be indicated by an index.

[0174] The names used in the above parameters are not limiting in all respects. Furthermore, the formulas and the like using these parameters are sometimes different from those explicitly disclosed in the present disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any appropriate names, so the various names assigned to these various channels and information elements are not limiting in all respects.

[0175] (Base station (wireless base station))

[0176] In the present disclosure, the terms "base station (BS)," "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier" and the like are used interchangeably. Base stations are sometimes referred to as macrocells, small cells, femtocells, picocells and the like.

[0177] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (RRH: Remote Radio Head). Terms such as "cell" or "sector" refer to a part or the entire coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0178] (terminal)

[0179] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0180] In some cases, a mobile station is also referred to by those skilled in the art as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handheld device, a user agent, a mobile client, a client or some other appropriate terminology.

[0181] (Base station / Mobile station)

[0182] At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may be a device carried in a mobile body, the mobile body itself, etc. The mobile body may be a vehicle (such as a car, an airplane, etc.), an unmanned mobile body (such as a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that may not necessarily move during communication operations. For example, at least one of the base station and the mobile station may also be an IoT (Internet of Things) machine such as a sensor.

[0183] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various schemes / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, which may also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the functions possessed by the above-mentioned base station 10 may also be set as the structure possessed by the terminal 20. In addition, words such as "uplink" and "downlink" may also be replaced by words corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may also be replaced by a side channel.

[0184] Likewise, the terminal in the present disclosure may be replaced by a base station. In this case, the functions of the terminal 20 described above may be replaced by the configuration of the base station 10.

[0185] (Meaning and explanation of terms)

[0186] The terms "determining" and "determining" used in the present disclosure may include various operations in some cases. "Determining" and "determining" may include situations where, for example, judging, calculating, computing, processing, deriving, investigating, looking up (for example, searching in a table, database or other data structure), ascertaining are considered to be "determining" and "determining". In addition, "determining" and "determining" may include situations where receiving (for example, receiving information), transmitting (for example, transmitting information), inputting, outputting, accessing (for example, accessing data in a memory) are considered to be "determining" and "determining". In addition, "determining" and "determining" may include situations where resolving, selecting, choosing, establishing, comparing, etc. are considered to be "determining" and "determining". That is, "determining" and "determining" may include situations where certain operations are considered to be "determined" and "determined". In addition, “judgment (decision)” can also be replaced by “assuming (assuming)”, “expecting (expecting)”, “considering (considering)” and the like.

[0187] Terms such as "connected", "coupled", or all variations thereof indicate all direct or indirect connections or combinations between two or more elements, and may include situations where there are one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may also be replaced by "accessed". In the context of use in the present disclosure, it may be considered to use at least one of one or more wires, cables, and printed electrical connections, and as several non-limiting and non-inclusive examples, electromagnetic energy having wavelengths in the wireless frequency domain, microwave region, and light (both visible and invisible) region, etc., to "connect" or "couple" two elements to each other.

[0188] The reference signal may be simply referred to as RS (Reference Signal), and may also be referred to as a pilot signal (Pilot) or the like depending on the applied standard.

[0189] The term “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the term “based on” means both “based only on” and “based at least on”.

[0190] Reference to elements with the designations "first", "second", etc., does not fully define the amount or order of these elements. These designations may be used in this specification as a convenient method of distinguishing between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements may be used, or that the first element must take precedence over the second element in any form.

[0191] The expression "part" in the configuration of each of the above-mentioned devices may be replaced with "unit", "circuit", "device" or the like.

[0192] When the terms "include", "including", and variations thereof are used in the present disclosure, these terms, like the term "comprising", refer to inclusiveness. Furthermore, the term "or" used in the present specification or claims does not refer to an exclusive or.

[0193] A radio frame may also be composed of one or more frames in the time domain. In the time domain, one or more frames may also be referred to as subframes. A subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is independent of a parameter set (numerology).

[0194] The parameter set may also be a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. The parameter set may also represent, for example, at least one of the subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, and specific windowing processing performed by the transmitter and receiver in the time domain.

[0195] A time slot may also be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing)) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access)) symbols, etc.) in the time domain. A time slot may also be a time unit based on a parameter set.

[0196] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be called a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a larger time unit than a mini-slot may also be called a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be called a PDSCH (or PUSCH) mapping type B.

[0197] Any of a radio frame, a subframe, a time slot, a mini-time slot, and a symbol indicates a time unit when a signal is transmitted. A radio frame, a subframe, a time slot, a mini-time slot, and a symbol may be referred to by other names corresponding to each other.

[0198] For example, one subframe may also be referred to as a transmission time interval (TTI), multiple consecutive subframes may also be referred to as TTI, and one time slot or one mini time slot may also be referred to as TTI. That is, at least one of the subframe and the TTI may be a subframe (1ms) in the existing LTE, or a period shorter than 1ms (for example, 1 to 13 symbols), or a period longer than 1ms. In addition, the unit representing TTI may also be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0199] Here, TTI refers to the minimum time unit for scheduling in wireless communication, for example. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0200] TTI can be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and can also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (for example, the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped can also be shorter than the TTI.

[0201] In addition, when one time slot or one mini time slot is referred to as TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) may also be the minimum time unit for scheduling. In addition, the number of time slots (the number of mini time slots) constituting the minimum time unit for scheduling may also be controlled.

[0202] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0203] In addition, long TTI (e.g., normal TTI, subframe, etc.) can also be replaced by TTI with a time length greater than 1ms, and short TTI (e.g., shortened TTI, etc.) can also be replaced by TTI with a TTI length less than that of long TTI and greater than 1ms.

[0204] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may also include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, it may be 12 subcarriers. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0205] In addition, the time domain of an RB may also include one or more symbols, and may be the length of one slot, one mini slot, one subframe, or one TTI. One TTI, one subframe, etc. may also be composed of one or more resource blocks.

[0206] In addition, one or more RBs may also be referred to as a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, and the like.

[0207] In addition, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0208] A bandwidth part (BWP) (also referred to as a partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a certain carrier. Here, the common RBs may be identified by the index of the RBs relative to the common reference point of the carrier. PRBs may be defined by a BWP and numbered within the BWP.

[0209] The BWP may include a UL BWP (ULBWP) and a DL BWP (DLBWP). One or more BWPs may be configured for a UE within one carrier.

[0210] At least one of the set BWPs may be activated, and the UE may not assume that a specific signal / channel is sent or received outside the activated BWP. In addition, "cell", "carrier" and the like in the present disclosure may also be replaced with "BWP".

[0211] The above structures of radio frames, subframes, time slots, mini-time slots, and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP: Cyclic Prefix) length can be changed in various ways.

[0212] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure also includes the case where the noun following the article is in plural form.

[0213] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". It should be noted that the term may also mean "A and B are each different from C". The terms "separated from" and "bound to" may also be interpreted in the same way.

[0214] (Changes in plans, etc.)

[0215] Each scheme / implementation method described in this disclosure may be used alone or in combination, and may be switched during execution. In addition, notification of specific information (e.g., notification of "it is X") is not limited to being performed explicitly, but may also be performed implicitly (e.g., by not notifying the specific information).

[0216] The present disclosure is described in detail above, but it is obvious to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as a modification and variation scheme without departing from the subject matter and scope of the present disclosure determined based on the records of the claims. Therefore, the records of the present disclosure are for the purpose of illustration and do not have any restrictive meaning on the present disclosure.

[0217] Possibility of industrial application

[0218] One aspect of the present disclosure may be used in a wireless communication system, for example.

[0219] Explanation of symbols

[0220] 10A Master Node (MN)

[0221] 10B Slave Node (SN)

[0222] 20Terminal (UE)

[0223] 30MME / AMF

[0224] 40-1, 40-2TCE

[0225] 50-1, 50-2EMS

[0226] 101, 202 Sending unit

[0227] 102, 201 Receiving unit

[0228] 103, 203 control unit

Claims

1. A base station, comprising: a control unit that controls the first measurement triggered by receiving a first message containing a parameter indicating a start of the first measurement; and a sending unit, which instructs the other base station to start controlling the second measurement by sending a second message including a parameter of the second measurement to the other base station, the second message comprises a parameter indicating the start of the first measurement, a parameter indicating the logging interval of the second measurement, and a parameter indicating the logging period of the second measurement, The base station receives the first message from a first upper node, and sends the result of the first measurement to a second upper node different from the first upper node, The other base station transmits the result of the second measurement to a third upper node different from the first upper node and the second upper node.

2. A base station, comprising: a receiving unit, receiving a second message including parameters of a second measurement from another base station, the other base station controlling the first measurement triggered by receiving a first message including parameters indicating the start of the first measurement, a control unit, which starts control of the second measurement triggered by reception of the second message, the second message comprises a parameter indicating the start of the first measurement, a parameter indicating the logging interval of the second measurement, and a parameter indicating the logging period of the second measurement, The other base station receives the first message from the first upper node, and sends the result of the first measurement to a second upper node different from the first upper node, The base station transmits the result of the second measurement to a third upper node different from the first upper node and the second upper node.

3. A system comprising a first base station and a second base station, the first base station controls the first measurement triggered by receiving a first message containing parameters indicating the start of the first measurement, sends a second message containing parameters of the second measurement to the second base station, the second base station controlling the second measurement triggered by reception of the second message, the second message comprises a parameter indicating the start of the first measurement, a parameter indicating the logging interval of the second measurement, and a parameter indicating the logging period of the second measurement, The first base station receives the first message from a first upper node, and sends the result of the first measurement to a second upper node different from the first upper node, The second base station transmits the result of the second measurement to a third upper node different from the first upper node and the second upper node.

4. A communication method performed by a base station, comprising: a step of starting control of said first measurement triggered by receiving a first message containing parameters indicating the start of the first measurement; as well as a step of instructing the other base station to start controlling the second measurement by sending a second message containing parameters of the second measurement to the other base station, the second message comprises a parameter indicating the start of the first measurement, a parameter indicating the logging interval of the second measurement, and a parameter indicating the logging period of the second measurement, The base station receives the first message from a first upper node, and sends the result of the first measurement to a second upper node different from the first upper node, The other base station transmits the result of the second measurement to a third upper node different from the first upper node and the second upper node.

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