WO2021033282A1

WO2021033282A1 - Terminal device, base station device, and wireless communication method

Info

Publication number: WO2021033282A1
Application number: PCT/JP2019/032592
Authority: WO
Inventors: 雅伏木
Original assignee: ソフトバンク株式会社
Priority date: 2019-08-21
Filing date: 2019-08-21
Publication date: 2021-02-25
Also published as: JPWO2021033282A1

Abstract

Provided are a terminal device, a base station device, and a wireless communication method that suppress communication between the terminal device and the base station device.　A terminal device 10 that comprises, a measurement unit 12 that, at a prescribed time interval, measures the reception quality of cells that are formed by base station devices, a determination unit 14 that determines whether the measured reception qualities have fluctuated from reception qualities from before the measurement, and a response unit 15 that responds to requests from the base station devices 50 with reception qualities that have been determined to have fluctuated. As a result, if, for example, the prescribed interval is set to be short, rapid fluctuations in reception quality could be measured for the cells of a base station device 50-2 that had rapid fluctuations in reception quality, but the frequency of reception quality responses for the cells of a base station device 50-1 that had few fluctuations in reception quality would decrease, making it possible to suppress redundant reception quality responses.

Description

Terminal equipment, base station equipment, and wireless communication methods

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

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

Conventionally, in LTE and NR, technologies such as MDT (Minimization of Driving Test) that collects network information necessary for coverage measures, etc. measured by a terminal device have been adopted or studied (Non-Patent Documents 1 and 2). See). In addition, it is planned to support communication with extraterrestrial networks (NTN: Non-Terrestrial Networks) such as radio base station equipment installed on artificial satellites and high altitude pseudo satellites (HAPS: High Attitude Pseudo Satellite) in NR. (See Non-Patent Document 3).

In networks including extraterrestrial networks, radio base station equipment installed on artificial satellites (hereinafter referred to as "air base station equipment") and radio base station equipment installed on the ground (hereinafter "ground base station equipment") To coexist (mix) with.

When there is no change in the terminal device itself, the reception quality of the cells formed in the ground base station device is unlikely to fluctuate, whereas in the sky base station device, there is no change in the terminal device itself due to the movement of artificial satellites, etc. However, the reception quality of the cells formed by the sky base station device may fluctuate in a short time. Therefore, when the predetermined measurement interval is set to a long time in the measurement of the reception quality of the cell, the terminal device can measure the reception quality of the cell formed by the sky base station device only at a long discrete interval, and the reception fluctuates quickly. Quality cannot be measured sufficiently. On the other hand, if the predetermined measurement interval is set to a short time, the terminal device redundantly measures the reception quality of the cells formed by the ground base station device, and notifies the ground base station device of the measurement result. This consumes resources in the ground base station equipment.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a base station device, a terminal device, and a wireless communication method capable of appropriately measuring and notifying fluctuations in cell reception quality. And.

The terminal device according to one aspect of the present invention includes a measuring unit that measures the reception quality of cells formed by the base station device at predetermined time intervals, and the measured reception quality varies from the reception quality before the measurement. It is provided with a determination unit for determining whether or not the measurement has been performed, and a response unit for responding to the request from the base station apparatus with the reception quality determined to have changed.

The terminal device according to one aspect of the present invention includes a receiving unit that receives a measurement interval associated with the base station device from the base station device, and a cell formed by the base station device at each time interval according to the measurement interval. It is provided with a measuring unit for measuring reception quality.

The terminal device according to one aspect of the present invention determines the reception quality of a receiving unit that receives a first measurement interval and a second measurement interval different from the first measurement interval from the base station device and a cell formed by the base station device. It is provided with a measuring unit that alternately performs a first measurement that measures at a time interval corresponding to a first measurement interval and a second measurement that measures the reception quality of a cell at a time interval corresponding to a second measurement interval.

The base station apparatus according to one aspect of the present invention is a base station apparatus that wirelessly communicates with a terminal apparatus, and is a measurement instruction for instructing measurement of reception quality of a cell formed by the base station apparatus. It is provided with a transmitting unit for transmitting a measurement instruction including a measurement interval associated with the terminal device to the terminal device, and a receiving unit for receiving the reception quality measured by the terminal device from the terminal device.

The base station apparatus according to one aspect of the present invention is a base station apparatus that wirelessly communicates with a terminal apparatus, and is a measurement instruction for instructing measurement of reception quality of a cell formed by the base station apparatus, and is a first measurement. A transmission unit that transmits a measurement instruction including an interval and a second measurement interval different from the first measurement interval to the terminal device, and a reception unit that receives the reception quality measured by the terminal device from the terminal device. Be prepared.

The wireless communication method according to one aspect of the present invention is a wireless communication method used for a terminal device, and is measured as a step of measuring the reception quality of cells formed by the base station device at predetermined time intervals. It includes a step of determining whether or not the reception quality has changed from the reception quality before the measurement, and a step of responding to the request from the base station apparatus with the reception quality determined to have changed.

According to the present invention, fluctuations in cell reception quality can be appropriately measured and notified.

FIG. 1 is a configuration diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 2 is a configuration diagram showing an example of the hardware configuration of the terminal device and the base station device. FIG. 3 is a configuration diagram showing an example of a functional block configuration of the terminal device. FIG. 4 is a configuration diagram showing an example of a functional block configuration of the base station apparatus. FIG. 5 is a configuration diagram showing a specific example of the wireless communication system. FIG. 6 is a time chart for explaining a first example of a processing procedure performed by a wireless communication system. FIG. 7 is a diagram for explaining the measurement result in the first example of the processing procedure performed by the wireless communication system. FIG. 8 is a time chart for explaining a second example of the processing procedure performed by the wireless communication system. FIG. 9 is a diagram for explaining the measurement of reception quality in the second example of the processing procedure performed by the wireless communication system. FIG. 10 is a time chart for explaining a third example of the processing procedure performed by the wireless communication system. FIG. 11 is a diagram for explaining the measurement of reception quality in the third example of the processing procedure performed by the wireless communication system. FIG. 12 is a flowchart for explaining an example of a processing procedure performed by the terminal device. FIG. 13 is a flowchart for explaining an example of a processing procedure performed by the base station apparatus.

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

First, with reference to FIG. 1, a schematic configuration of a wireless communication system according to one embodiment will be described. FIG. 1 is a configuration diagram showing an example of a schematic configuration of a wireless communication system 100 according to an embodiment.

As shown in FIG. 1, the wireless communication system 100 includes a terminal device 10-1 to a terminal device 10-m, a base station device 50-1 to a base station device 50-n, and a core network device 90. It is composed.

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

The terminal device 10-1 to the terminal device 10-m are wirelessly connected to any one of the base station device 50-1 to the base station device 50-n, respectively. Further, each of the terminal devices 10-1 to the terminal device 10-m may be wirelessly connected to two or more of the base station devices 50-1 to the base station device 50-n at the same time. E-UTRA or NR can be used for the base station apparatus 50-1 to the base station apparatus 50-n, respectively. For example, the base station apparatus 50-1 may use the NR and the base station apparatus 50n may use the E-UTRA, and vice versa. The base station device in E-UTRA is called eNB (evolved NodeB), and the base station device in NR is called gNB (g-NodeB). Hereinafter, when the term “base station apparatus” is used, it means that both eNB and gNB are included. Further, the terminal device in E-UTRA and NR is referred to as UE (User Equipment). The base station device gNB in the NR may be connected to the terminal device by using a part of the frequency band (BWP: Carrier bandwidth part) used. Hereinafter, when the term "cell" is used, BWP is included.

Note that FIG. 1 illustrates terminal devices 10-1 to 10-m as terminal devices in the m range (m is an integer of 2 or more). In the following description, when these m-unit terminal devices are described without distinction, a part of the reference numerals is omitted and the term “terminal device 10” is simply referred to. Further, FIG. 1 illustrates base station devices 50-1 to 50-n as n base station devices (n is an integer of 2 or more). In the following description, when these n base station devices are described without distinction, a part of the reference numerals is omitted, and the term "base station device 50" is simply referred to.

The terminal device 10 may be connected to the base station device 50 in cell units, for example, and may be connected using a plurality of cells, for example, carrier aggregation. When the terminal device 10 is connected via a plurality of base station devices, that is, in the case of dual connectivity, the base station device to be initially connected is the master node (MN: MasterNode), and the base station device to be additionally connected is It is called a secondary node (SN: Secondary Node). The base station devices are connected by a base station interface. Further, the base station device 50 and the core network device 90 are connected by a core interface. The base station interface is used for exchanging control signals necessary for handover and cooperative operation between base station devices.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

As shown in FIG. 3, the terminal device 10 includes a receiving unit 11, a measuring unit 12, an acquisition unit 13, a determination unit 14, and a response unit 15 as functional blocks.

The receiving unit 11 is configured to receive a measurement instruction from the base station device 50. The measurement instruction instructs the measurement of the reception quality of the cell formed by the base station apparatus 50.

The measurement instruction includes, for example, a measurement time indicating the time from the start to the end in the measurement of reception quality, and a measurement interval indicating the time interval for performing the measurement in the measurement time. Usually, the measurement time is set to 10 minutes or more and 120 minutes or less, and the measurement interval is set to 1.28 seconds or more and 61.44 seconds or less. Therefore, the terminal device 10 measures the reception quality of the cell a plurality of times during the measurement time. Further, the measurement instruction may further include a base station ID which is an identifier of the base station apparatus 50, and a tracking area composed of one or a plurality of adjacent cells. The tracking area can be identified by a tracking area code (TAC: TA Code) or the like.

The measurement interval included in the measurement instruction may be associated with the base station device 50. That is, the measurement interval can be set by associating different times with each of the plurality of base station devices 50. The correspondence between the measurement interval and the base station apparatus 50 is not limited to the case of one-to-one. The correspondence between the measurement interval and the base station device 50 may be, for example, 1 to N (N is an integer of 2 or more), and a plurality of base station devices 50 are divided into one group, and each group is divided into one group. The measurement interval is associated. In this case, the measurement instruction includes a group ID for identifying the group.

Further, the measurement instruction may include two measurement intervals, that is, a first measurement interval and a second measurement interval, instead of the measurement interval described above. The first measurement interval and the second measurement interval are different times from each other. For example, a relatively long time is set for the first measurement interval and a relatively short time is set for the second measurement interval. ..

The measuring unit 12 is configured to measure the reception quality of the cells formed by the base station apparatus 50 at predetermined time intervals. The predetermined time interval is, for example, a measurement interval included in the measurement instruction received by the receiving unit 11.

Specifically, the measurement unit 12 updates the parameter for measuring the reception quality of the cell (hereinafter, referred to as "measurement parameter") based on the information included in the measurement instruction. As a result, the measurement time and the measurement interval are set. Then, the measuring unit 12 measures the reception quality of the cell formed by the base station apparatus 50 at intervals according to the measurement interval during the measurement time.

The received quality of the measured cell is, for example, RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), RSSI (received signal strength indicator), RS-SINR (Reference Signal-Signal to Interference and Noise Ratio), Or a combination of these. The received quality of the measured cell is stored and held in the memory 22 or the storage device 23.

Further, the measuring unit 12 measures the reception quality of the cell formed by the base station apparatus 50 at each time interval according to the measurement interval associated with the base station apparatus 50, which is included in the received measurement instruction. It may be configured as follows.

Further, the measuring unit 12 measures the reception quality of the cell formed by the base station device 50 at a time interval corresponding to the first measurement interval, and measures the reception quality of the cell of the base station device 50 at a second measurement interval. The second measurement, which is measured at time intervals according to the above, may be alternately performed.

The acquisition unit 13 is configured to acquire position information indicating the position of the terminal device 10 at predetermined time intervals. The predetermined time interval is the same time as the predetermined time interval in the measurement of the reception quality of the cell by the measuring unit 12, and is, for example, the measurement interval included in the measurement instruction received by the receiving unit 11. That is, the acquisition of the position information is performed at the same timing as or substantially the same as the measurement of the reception quality of the cell.

Location information is acquired by positioning using GNSS (Global Navigation Satellite System) such as GPS (Global Positioning System), for example. In addition, the acquisition unit 13 uses, for example, OTDOA (Observed Time Difference Of Arrival), A-GPS (Assisted GPS), SUPL (Secure User Plane Location), etc. in place of GNSS or together with GNSS, and the terminal device 10 You may acquire the position information of.

The determination unit 14 is configured to determine whether or not the measured reception quality has changed from the reception quality before the measurement. The reception quality before the measurement is, for example, the reception quality measured immediately before. In addition to the reception quality measured immediately before, the reception quality before the measurement may be, for example, the reception quality measured before a predetermined time, or a plurality of receptions measured before the measurement. It may be an average of quality. When calculating the average of a plurality of reception qualities, a simple average may be calculated, or a weighted average may be calculated according to the order in which the reception qualities are measured.

More specifically, the determination unit 14 determines that the measured reception quality did not change when the amount of variation in the measured reception quality from the reception quality before the measurement was within a predetermined range. It is configured as follows. In other words, when the amount of change in the measured reception quality from the reception quality before the measurement is out of the predetermined range, it is determined that the measured reception quality has changed. The predetermined range may be included in the above-mentioned measurement instruction transmitted from the base station apparatus 50, or may be included in the measurement result request described later.

In this way, when the amount of variation in the measured reception quality from the reception quality before the measurement is within a predetermined range, it is determined that the measured reception quality has not changed, so that the amount of variation is If it is small and within a predetermined range, it can be considered that there is no change in reception quality. Therefore, when the fluctuation amount of the reception quality of the cell is small, the notification to the base station device 50 can be suppressed, and the resource consumption of the base station device 50 can be reduced.

Further, the determination unit 14 is configured to further determine whether or not the acquired position information has changed from the position information before the acquisition. The position information before the acquisition is the same as the reception quality before the measurement, whether it is the position information acquired immediately before or the position information acquired before a predetermined time, a plurality of positions acquired before the acquisition. It may be the average of information.

More specifically, the determination unit 14 determines that the acquired position information has not changed when the amount of change in the acquired position information from the position information before the acquisition is within a predetermined range. It is configured as follows. In other words, when the amount of change in the acquired position information from the position information before the acquisition is outside the predetermined range, it is determined that the acquired position information has changed. The predetermined range is different from the predetermined range for the reception quality, and may be included in the above-mentioned measurement instruction transmitted from the base station apparatus 50, or may be included in the measurement result request described later. ..

The response unit 15 is configured to respond to the request from the base station device 50 with the reception quality determined to have changed. Specifically, when a measurement result request (hereinafter referred to as "measurement result request") is received from the base station apparatus 50, the reception quality determined to have fluctuated is determined by the base station that is the source of the measurement result request. It is transmitted to the device 50 as a response.

Further, the response unit 15 is configured to respond to the request from the base station apparatus 50 with the time during which the reception quality is measured, which is determined to have not changed. That is, when it is determined that there is no change, the response unit 15 responds only with the time of measurement, and the measured reception quality itself is not transmitted as a response.

In this way, by responding to the request from the base station device 50 with the time during which the reception quality measurement determined to have not fluctuated is performed, the base station device 50 has no or small fluctuation and the terminal device. It is possible to separate the case where 10 is out of the cell range. Therefore, it can be avoided that the base station apparatus 50 is considered to be unable to log.

Further, the response unit 15 is configured to further respond to the request from the base station device 50 with the position information determined to have changed. Specifically, when the measurement result request is received from the base station device 50, the reception quality and position information determined to have changed are transmitted as a response to the base station device 50 which is the source of the measurement result request.

In this way, by further responding to the request from the base station device 50 with the position information determined to have changed, for example, the position information acquired when the position of the terminal device 10 does not change or hardly changes. Is not responded, so it is possible to suppress redundant notification of location information. Therefore, it is possible to appropriately notify the change of the position information of the terminal device.

Similar to the determination of reception quality, the response unit 15 is configured to respond to the request from the base station apparatus 50 with the time when the position information determined to have not changed is acquired. Good. That is, when it is determined that there is no change, the response unit 15 responds only with the acquisition time, and does not transmit the acquired position information itself as a response.

Alternatively, the response unit 15 is configured to respond to the request from the base station apparatus 50 with the reception quality and the position information, regardless of the determination result by the determination unit 14 or the determination by the determination unit 14. You may be.

The receiving unit 11, the measuring unit 12, the acquiring unit 13, and the responding unit 15 may be realized by, for example, the communication device 24, and the processor 21 in addition to the communication device 24 stores the program stored in the storage device 23. It may be realized by executing. The determination unit 14 may be realized by the processor 21 executing the program stored in the storage device 23. When executing a program, the program may be stored in a storage medium. The storage medium in which the program is stored may be a computer-readable non-transitory storage medium (Non-transitory computer readable medium). The non-temporary storage medium is not particularly limited, but may be, for example, a storage medium such as a USB (Universal Serial Bus) memory or a CD-ROM (Compact Disc ROM).

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

As shown in FIG. 4, the base station apparatus 50 includes a generation unit 51, a transmission unit 52, a request unit 53, and a reception unit 54 as functional blocks.

The generation unit 51 is configured to generate a measurement instruction instructing the measurement of the reception quality of the cell formed by the base station device 50. As described above, the generated measurement instruction includes the measurement time and the measurement interval, and may further include the base station ID and the tracking area. Further, the measurement interval included in the measurement instruction may be set in association with the base station device 50, or may be set in association with each group of a plurality of base station devices 50. May be good. In this case, the measurement instruction is generated including the group ID. Further, the generated measurement instruction may include a first measurement interval and a second measurement interval different from the first measurement interval. Furthermore, the generated measurement instruction may include a predetermined range for determining the reception quality and / or a predetermined range for determining the position information.

The transmission unit 52 is configured to transmit the generated measurement instruction to the terminal device 10.

The request unit 53 is configured to transmit a measurement result request to the terminal device 10 that has transmitted the measurement instruction. The measurement result request may include a predetermined range for determining the reception quality and / or a predetermined range for determining the position information. When transmitting the measurement result request, the terminal device 10 may be in an idle state or may be in a connected state.

The receiving unit 54 is configured to receive the reception quality measured by the terminal device 10 from the terminal device 10 as a response to the measurement result request.

Further, the receiving unit 54 is configured to receive the position information acquired by the terminal device 10 from the terminal device 10 as a response to the measurement result request.

The transmission unit 52, the request unit 53, and the reception unit 54 may be realized by, for example, the communication device 24, or the processor 21 in addition to the communication device 24 executes a program stored in the storage device 23. It may be realized. The generation unit 51 may be realized by the processor 21 executing the program stored in the storage device 23. When executing a program, the program may be stored in a storage medium. The storage medium in which the program is stored may be a non-temporary storage medium that can be read by a computer. The non-temporary storage medium is not particularly limited, but may be, for example, a storage medium such as a USB memory or a CD-ROM.

<Specific example of wireless communication system>
Next, a specific example of the wireless communication system according to the embodiment will be described with reference to FIG. FIG. 5 is a configuration diagram showing a specific example of the wireless communication system 100A. Note that in FIG. 5, drawing of the core network device 90 included in the wireless communication system 100A is omitted.

(Specific example of wireless communication system)
As shown in FIG. 5, the wireless communication system 100A includes two base station devices 50-1 and 50-2. The base station device 50-1 is installed on the ground. Each base station device 50-1 forms a relatively small cell, for example, a cell having a radius of several hundred meters to a dozen kilometers.

The base station device 50-2 is installed on an object flying over the sky, such as an artificial satellite, a high altitude pseudo satellite (HAPS: High Attitude Pseudo Satellite), or a high altitude projectile. When the base station device 50-2 is installed on an artificial satellite, its orbit may be low earth orbit (LEO: Low Earth Orbit) or geosynchronous orbit (GEO: Geosynchronous Equatorial Orbit). May be good. The base station apparatus 50-2 forms a relatively large cell, for example, a cell having a radius of several hundred kilometers to a thousand and several hundred kilometers. In the example shown in FIG. 5, the base station device 50-2 is installed in a high-altitude projectile having a lower altitude than the GPS satellite GS.

As shown in FIG. 5, the base station device 50-2 is turning to maintain its altitude. As the base station device 50-2 turns, the cell formed by the base station device 50-2 moves to, for example, the area represented by the alternate long and short dash line in FIG. 5 or the area indicated by the broken line in FIG. Therefore, the reception quality of the cell of the base station device 50-2 measured by the terminal device 10 tends to fluctuate quickly in a relatively short time. On the other hand, the base station device 50-1 installed on the ground generally does not move. Therefore, the reception quality of the cell of the base station device 50-1 measured by the terminal device 10 tends to be relatively small.

In this way, in the wireless communication system 100A in which the base station device 50-1 installed on the ground and the base station device 50-2 installed on the high altitude projectile coexist (mix), the reception quality of the cell is improved. When the time interval in the measurement is set to a relatively long time, the terminal device 10 can measure the reception quality of the cells formed by the base station device 50-2 only at a long discrete interval, and the reception quality with rapid fluctuation is sufficiently sufficient. Cannot measure. On the other hand, if the time interval in the measurement of the reception quality of the cell is set to a relatively short time, the terminal device 10 will redundantly measure the reception quality of the cell formed by the base station device 50-1. By responding to the base station device 50-1 with the measurement result, resources such as the number of lines and the frequency band in the base station device 50-1 are consumed.

<Processing procedure>
Next, the processing procedure performed by the wireless communication system according to the embodiment will be described with reference to FIGS. 6 to 11. FIG. 6 is a time chart for explaining a first example of a processing procedure performed by the wireless communication system 100A. FIG. 7 is a diagram for explaining the measurement result in the first example of the processing procedure performed by the wireless communication system 100A. FIG. 8 is a time chart for explaining a second example of the processing procedure performed by the wireless communication system 100A. FIG. 9 is a diagram for explaining the measurement of reception quality in the second example of the processing procedure performed by the wireless communication system 100A. FIG. 10 is a time chart for explaining a third example of the processing procedure performed by the wireless communication system 100A. FIG. 11 is a diagram for explaining the measurement of reception quality in the third example of the processing procedure performed by the wireless communication system 100A. Note that FIGS. 6 to 11 describe the processing procedure of the wireless communication system 100A shown in FIG.

(Processing procedure of the first example)
As shown in FIG. 6, first, in the base station device 50-1 or the base station device 50-2, the generation unit 51 generates a measurement instruction, and the transmission unit 52 transmits the generated measurement instruction to the terminal device 10. (S101). The transmission unit 52 transmits the generated measurement instruction, for example, by the Logged Measurement Configuration in the log recording MDT (Logged MDT).

Next, in the terminal device 10, the receiving unit 11 receives the measurement instruction transmitted from the base station device 50-1 or the base station device 50-2, and the measuring unit 12 updates the measurement parameter based on the received measurement instruction. (S102).

Then, at predetermined measurement intervals, the measurement unit 12 measures the reception quality of the cells formed by the base station devices 50-1, 50-2 that have transmitted the measurement instructions, and the acquisition unit 13 self from the GPS satellite GS. The position information of the above is acquired (S103). As described above, usually, the measurement of the reception quality and the acquisition of the position information are performed a plurality of times, respectively.

After the measurement time has elapsed, in the base station devices 50-1 and 50-2 that have transmitted the measurement instruction, the requesting unit 53 transmits the measurement result request to the terminal device 10 that has transmitted the measurement instruction (S104). The request unit 53 transmits the measurement result request, for example, by the UE Information Request in the log recording MDT (Logged MDT).

The determination unit 14 of the terminal device 10 determines whether or not the measured reception quality has changed from the reception quality before the measurement, and whether the acquired position information has changed from the reception quality before the measurement. Whether or not it is determined (S105). The determination unit 14 determines whether or not each of the plurality of reception qualities and the plurality of position information has changed.

Then, the response unit 15 determines that the reception quality determined to have changed, the position information determined to have changed, and the measurement result request from the base station devices 50-1 and 50-2 have not changed. The time for measuring the reception quality and the time for acquiring the position information determined to have not fluctuated are responded to the base station devices 50-1, 50-2 that transmitted the measurement result request (S106).
The response unit 15 transmits the response by, for example, UE Information Response in the logging MDT (Logged MDT).

As shown in FIG. 7, the reception quality of the cell is measured and the position information of the terminal device 10 is acquired, for example, every 30 seconds as the measurement interval. In addition, in FIG. 7, the reception quality is RSRP [dBm], and for convenience of explanation, the reception quality is measured and the position information is acquired at the same time. For example, in the reception quality, the reception quality of the cell measured by the terminal device 10 at the time "0.00: 30" is "-89 [dBm]", which is an amount of variation from the immediately preceding reception quality 1 [. When [dBm] is within a predetermined range, it is determined that the reception quality has not changed, the time “0.00: 30” is transmitted to the base station device 50, and the reception quality is not transmitted to the base station device 50. .. In the example of FIG. 7, when it is not transmitted to the base station apparatus 50, it is indicated as “−”. Further, the reception quality of the cell measured by the terminal device 10 at the time "0.01: 00" is "-89 [dBm]", and the amount of variation from the immediately preceding reception quality is zero, so that the reception quality is It is determined that there is no change, the time "0.01: 00" is transmitted to the base station device 50, and the reception quality is not transmitted to the base station device 50. Further, the reception quality of the cell measured by the terminal device 10 at the time "0.01: 30" is "-80 [dBm]", and 8 [dBm], which is the amount of variation from the immediately preceding reception quality, is predetermined. If it is out of the range of, it is determined that the reception quality has fluctuated, and the time "0.01: 30" and the reception quality "-80 [dBm]" are transmitted to the base station apparatus 50. Furthermore, the reception quality of the cell measured by the terminal device 10 at the time "0.02:00" is "-78 [dBm]", and 2 [dBm], which is the amount of variation from the immediately preceding reception quality, is If it is within a predetermined range, it is determined that the reception quality has not changed, the time "0.02:00" is transmitted to the base station device 50, and the reception quality is not transmitted to the base station device 50. Since the location information is the same as the description of the reception quality described above, the description thereof will be omitted.

In this way, the terminal device 10 responds to the measurement result request from the base station devices 50-1, 50-2 with the reception quality determined to have fluctuated, so that, for example, a predetermined time interval is set for a short time. When set to, in the case of the cell of the base station device 50-2 in which the fluctuation of the reception quality is fast, the rapid fluctuation of the reception quality can be measured, and in the case of the cell of the base station device 50-1 in which the fluctuation of the reception quality is small. , The reception quality is less frequently responded, and it becomes possible to suppress redundant reception quality responses. Therefore, it is possible to appropriately notify the fluctuation of the reception quality according to the speed at which the reception quality of the cell fluctuates.

(Processing procedure of the second example)
Since the processing procedure of the second example shown in FIG. 8 is substantially the same as the processing procedure of the first example shown in FIG. 6, the differences from the processing procedure of the first example will be mainly described.

As shown in FIG. 8, instead of step S101 shown in FIG. 6, the generation unit 51 generates a measurement instruction including the group ID and the measurement interval, and the transmission unit 52 outputs the generated measurement instruction to the terminal device 10. Is transmitted to (S107). The measurement interval is associated with the group of base station apparatus 50-1 or base station apparatus 50-2 identified by the group ID.

Next, after updating the measurement parameters based on the measurement instructions in step 102, the measurement unit is set at each time interval according to the measurement interval associated with the group of the base station device 50-1 or the base station device 50-2. 12 measures the reception quality of the cells formed by the base station devices 50-1 and 50-2 that have transmitted the measurement instruction, and the acquisition unit 13 acquires its own position information from the GPS satellite GS (S108).

Note that the terminal device 10 does not perform the determination in step S105 shown in FIG. That is, all of the measured reception quality and the acquired position information are transmitted as a response to the base station devices 50-1 and 50-2 that have transmitted the measurement result request.

As shown in FIG. 9, the measurement of the reception quality of the cell is performed at the measurement interval associated with the group of the base station device 50-1 or the base station device 50-2. For example, when the group ID of the group of the base station apparatus 50-1 is "1", as shown in the upper part, the first measurement interval of a relatively long time is associated. In this case, the terminal device 10 measures the reception quality of the cell at each first measurement interval. On the other hand, when the group ID of the group of the base station apparatus 50-2 is "2", as shown in the upper part, the second measurement interval of a relatively short time is associated. In this case, the terminal device 10 measures the reception quality of the cell at each second measurement interval. Although illustration and description thereof will be omitted, the acquisition of position information is also performed at each first measurement interval or every second measurement interval.

As described above, the terminal device 10 is the base station device 50-1 or the base station device 50 at each time interval corresponding to the measurement interval associated with the group of the base station device 50-1 or the base station device 50-2. By measuring the reception quality of the cell formed by -2, for example, the first measurement interval of a relatively long time is associated with the base station device 50-1, and the base station device 50-2 is relatively short. By associating the second measurement interval of time, it becomes possible to set the measurement interval according to the speed at which the reception quality fluctuates. Therefore, the fluctuation of the reception quality of the cell can be appropriately measured according to the speed at which the reception quality of the cell fluctuates.

Further, the base station devices 50-1 and 50-2 transmit the measurement instruction including the measurement interval associated with the base station device 50-1 or the group of the base station device 50-2 to the terminal device 10. For example, the reception quality varies by associating the base station apparatus 50-1 with the first measurement interval having a relatively long time and associating the base station apparatus 50-2 with the second measurement interval having a relatively short time. It is possible to set the measurement interval according to the speed of measurement. Therefore, it is possible to appropriately receive the fluctuation of the reception quality of the cell according to the speed at which the reception quality of the cell fluctuates.

(Processing procedure of the third example)
Since the processing procedure of the third example shown in FIG. 10 is substantially the same as the processing procedure of the first example shown in FIG. 6, the differences from the processing procedure of the first example will be mainly described.

As shown in FIG. 10, instead of step S101 shown in FIG. 6, the generation unit 51 generates a measurement instruction including the first measurement interval and the second measurement interval, and the transmission unit 52 generates the generated measurement instruction. , Transmit to the terminal device 10 (S109).

Next, after updating the measurement parameters based on the measurement instructions in step 102, the measurement unit 12 measures the reception quality of the cells formed by the base station devices 50-1 and 50-2 that have transmitted the measurement instructions. The first measurement, which measures at a time interval corresponding to one measurement interval, and the second measurement, which measures the reception quality of the cell at a time interval corresponding to a second measurement interval, are alternately performed (S110). At this time, the acquisition unit 13 obtains the first acquisition of its own position information from the GPS satellite GS at a time interval corresponding to the first measurement interval, and the acquisition of the position information according to the second measurement interval. The second acquisition, which is acquired at different time intervals, is alternately performed.

As shown in FIG. 11, the measurement of the reception quality of the cell is performed by alternately switching between the first measurement interval and the second measurement interval. For example, after measuring the reception quality of the cell at the first measurement interval of a relatively long time, the reception quality of the cell is measured at the second measurement interval of a relatively short time. The first measurement by the first measurement interval and the second measurement by the second measurement interval are alternately repeated during the measurement time. Although illustration and description thereof will be omitted, similarly, with respect to the acquisition of position information, the first acquisition by the first measurement interval and the second acquisition by the second measurement interval are alternately repeated during the measurement time. Be told.

In this way, the terminal device 10 measures the reception quality of the cells formed by the base station devices 50-1 and 50-2 at the time interval corresponding to the first measurement interval, and the first measurement and the cell. By alternately performing the second measurement in which the reception quality is measured at the time interval corresponding to the second measurement interval, the first measurement is compared with the case where the reception quality of the cell is measured at a fixed time interval. The reception quality of the cell of the base station device 50-1 with little fluctuation of the reception quality is measured to suppress redundant measurement and response, and the reception of the cell of the base station device 50-1 with a rapid fluctuation of the reception quality in the second measurement. It is possible to measure the quality. Therefore, it is possible to easily receive the reception quality of the cell corresponding to the different speeds of the fluctuation of the reception quality of the cell.

Further, the base station device 50 transmits a measurement instruction including the first measurement interval and the second measurement interval different from the first measurement interval to the terminal device 10 by the base station devices 50-1 and 50-2. As a result, the terminal device 10 can alternately measure the reception quality of cells having different measurement intervals, so that the reception quality is received in the first measurement as compared with the case where the reception quality of cells is measured at regular time intervals. The reception quality of the cell of the base station device 50-1 with little fluctuation in quality is measured to suppress redundant measurement and response, and the reception quality of the cell of the base station device 50-1 with fast fluctuation of reception quality in the second measurement. Can be measured. Therefore, the reception quality of the cell can be easily measured corresponding to the different speeds of the fluctuation of the reception quality of the cell.

Next, with reference to FIGS. 12 and 13, the processing procedure performed by the terminal device and the base station device according to one embodiment will be described. FIG. 12 is a flowchart for explaining an example of the processing procedure performed by the terminal device 10. FIG. 13 is a flowchart for explaining an example of the processing procedure performed by the base station apparatus 50.

(Terminal device processing procedure)
As shown in FIG. 12, first, the receiving unit 11 receives the measurement instruction from the base station apparatus 50 (S201).

Next, the measurement unit 12 updates the measurement parameters based on the received measurement instruction (S202).

Next, at predetermined time intervals, the measuring unit 12 measures the reception quality of the cell formed by the base station device 50, and the acquiring unit 13 acquires its own position information from the GPS satellite GS (S203).

Next, the determination unit 14 determines whether or not there is a measurement result request from the base station device 50 (S204). The determination unit 14 repeats the determination of S204 until there is a measurement result request from the base station apparatus 50.

When there is a measurement result request from the base station apparatus 50 as a result of the determination in step S204, the determination unit 14 determines whether or not the measured reception quality has changed from the reception quality before the measurement. It is determined whether or not the acquired position information has changed from the reception quality before the measurement (S205).

Next, the response unit 15 responds to the measurement result request from the base station apparatus 50 with the reception quality determined to have changed and the position information determined to have changed (S206).

(Processing procedure of base station equipment)
As shown in FIG. 13, first, the generation unit 51 generates a measurement instruction (S251). The transmission unit 52 transmits the measurement instruction generated in step S251 to the terminal device 10 (S252).

After the elapse of the predetermined time, the requesting unit 53 transmits the measurement result request to the terminal device 10 that has transmitted the measurement instruction in step S253 (S253).

Then, the receiving unit 54 receives the reception quality measured by the terminal device 10 and the position information acquired by the terminal device 10 as a response from the terminal device 10 (S254).

The order of the sequences and flowcharts described in the present embodiment may be changed as long as there is no contradiction in processing.

The exemplary embodiments of the present invention have been described above. According to the terminal device 10 and the wireless communication method of the present embodiment, the reception quality determined to have fluctuated is responded to the measurement result request from the base station devices 50-1 and 50-2. Thereby, for example, if a predetermined time interval is set to a short time, in the case of the cell of the base station apparatus 50-2 in which the fluctuation of the reception quality is fast, the fluctuation of the reception quality can be measured quickly, and the fluctuation of the reception quality can be measured. In the case of the cell of the base station apparatus 50-1 with a small number, the reception quality is less frequently responded, and it becomes possible to suppress the redundant reception quality response. Therefore, it is possible to appropriately notify the fluctuation of the reception quality according to the speed at which the reception quality of the cell fluctuates.

Further, according to the terminal device 10 and the base station devices 50-1 and 50-2 of the present embodiment, the time corresponding to the measurement interval associated with the group of the base station device 50-1 or the base station device 50-2. At each interval, the reception quality of the cells formed by the base station device 50-1 or the base station device 50-2 is measured. Thereby, for example, the base station apparatus 50-1 is associated with the first measurement interval having a relatively long time, and the base station apparatus 50-2 is associated with the second measurement interval having a relatively short time. It becomes possible to set the measurement interval according to the fluctuating speed. Therefore, the fluctuation of the reception quality of the cell can be appropriately measured according to the speed at which the reception quality of the cell fluctuates.

Further, according to the terminal device 10 and the base station devices 50-1 and 50-2 of the present embodiment, the measurement of the reception quality of the cells formed by the base station devices 50-1 and 50-2 is performed at the first measurement interval. The first measurement, which measures at the corresponding time interval, and the second measurement, which measures the reception quality of the cell at the time interval corresponding to the second measurement interval, are alternately performed. As a result, compared to the case where the reception quality of the cell is measured at regular time intervals, the reception quality of the cell of the base station apparatus 50-1 with less fluctuation in the reception quality is measured in the first measurement, and the measurement is redundant. It is possible to suppress the response and measure the reception quality of the cell of the base station apparatus 50-1 in which the reception quality fluctuates quickly in the second measurement. Therefore, it is possible to easily receive the reception quality of the cell corresponding to the different speeds of the fluctuation of the reception quality of the cell.

It should be noted that the embodiments described above are for facilitating the understanding of the present invention, and are not for limiting and interpreting the present invention. The present invention can be modified / improved without departing from the spirit thereof, and the present invention also includes an equivalent thereof. That is, those skilled in the art with appropriate design changes to each embodiment are also included in the scope of the present invention as long as they have the features of the present invention. For example, each element included in the embodiment and its arrangement, material, condition, shape, size, and the like are not limited to those exemplified, and can be changed as appropriate. Further, the embodiments are exemplary, and it goes without saying that the configurations shown in different embodiments can be partially replaced or combined, and these are also included in the scope of the present invention as long as the features of the present invention are included.

10 ... Terminal device, 11 ... Receiver unit, 12 ... Measurement unit, 13 ... Acquisition unit, 14 ... Judgment unit, 15 ... Response unit, 21 ... Processor, 22 ... Memory, 23 ... Storage device, 24 ... Communication device, 25 ... Input device, 26 ... Output device, 27 ... Antenna, 50, 50-1, 50-2 ... Base station device, 51 ... Generation unit, 52 ... Transmission unit, 53 ... Request unit, 54 ... Receiver unit, 90 ... Core network Equipment, 100, 100A ... wireless communication system, GS ... GPS satellite.

Claims

A measuring unit that measures the reception quality of cells formed by the base station device at predetermined time intervals,
A determination unit that determines whether or not the measured reception quality has changed from the reception quality before the measurement.
A response unit that responds to the request from the base station apparatus with the reception quality determined to have fluctuated.
Terminal equipment.
The determination unit determines that the measured reception quality has not changed when the amount of variation from the reception quality before the measurement in the measured reception quality is within a predetermined range.
The terminal device according to claim 1.
The response unit responds to the request from the base station apparatus for the time during which the reception quality measurement determined to have not changed is performed.
The terminal device according to claim 1 or 2.
Further, an acquisition unit for acquiring position information indicating the position of the terminal device is provided at each predetermined time interval.
The determination unit further determines whether or not the acquired position information has changed from the position information before the acquisition.
The response unit further responds to the request from the base station apparatus with the position information determined to have changed.
The terminal device according to any one of claims 1 to 3.
A receiver that receives the measurement interval associated with the base station device from the base station device, and
A measuring unit for measuring the reception quality of a cell formed by the base station apparatus is provided at each time interval corresponding to the measurement interval.
Terminal equipment.
A receiving unit that receives the first measurement interval and the second measurement interval different from the first measurement interval from the base station apparatus, and
A first measurement in which the reception quality of a cell formed by the base station apparatus is measured at a time interval corresponding to the first measurement interval, and a first measurement in which the reception quality of the cell is measured at a time interval corresponding to the second measurement interval. A measuring unit that alternately performs two measurements is provided.
Terminal equipment.
A base station device that wirelessly communicates with a terminal device.
A transmission unit that is a measurement instruction for instructing the measurement of the reception quality of the cell formed by the base station apparatus, and transmits the measurement instruction including the measurement interval associated with the base station apparatus to the terminal apparatus.
A receiving unit that receives the reception quality measured by the terminal device from the terminal device.
Base station equipment.
A base station device that wirelessly communicates with a terminal device.
A measurement instruction for instructing the measurement of the reception quality of the cell formed by the base station apparatus, the measurement instruction including the first measurement interval and the second measurement interval different from the first measurement interval is transmitted to the terminal apparatus. With the transmitter
A receiving unit that receives the reception quality measured by the terminal device from the terminal device.
Base station equipment.
A wireless communication method used for terminal devices.
The step of measuring the reception quality of the cells formed by the base station apparatus at predetermined time intervals, and
A step of determining whether or not the measured reception quality deviates from the reception quality before the measurement, and
In response to a request from the base station apparatus, the step of responding to the reception quality determined to have changed includes.
Wireless communication method.