JP2018148250A - Terminal apparatus, base station apparatus, and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To communicate efficiently.SOLUTION: When a measurement object setting includes a first setting regarding a histogram of RSSI (Received Signal Strength Indicator), on the basis of the first setting, a resource for measuring RSSI and a receiving unit that determines the total number of resources used for generating a histogram are provided. The receiving unit divides the RSSI in each resource into some levels on the basis of the measured values to generate a histogram at each level.SELECTED DRAWING: Figure 4

Description

  Embodiments described herein relate generally to a terminal device, a base station device, and a method for realizing efficient communication.

  In 3GPP (3rd General Partnership Project), which is a standardization project, EUTRA (High Frequency Communication) is realized by adopting OFDM (Orthogonal Frequency Division Multiplexing) communication method and flexible scheduling of predetermined frequency and time units called resource blocks. Evolved Universal Terrestrial Radio Access) was standardized. Communication in general that employs standardized technology in EUTRA is sometimes referred to as LTE (Long Term Evolution) communication.

  Further, 3GPP is studying A-EUTRA (Advanced EUTRA) which realizes higher-speed data transmission and has upward compatibility with EUTRA. In EUTRA, a base station apparatus is a communication system on the premise of a network having substantially the same cell configuration (cell size). However, in A-EUTRA, base station apparatuses (cells) having different configurations are mixed in the same area. Communication systems based on existing networks (heterogeneous wireless networks, heterogeneous networks) are being studied.

  In 3GPP, examination of LAA (Licensed Assisted Access) communication that enables communication on a license-free frequency (unlicensed band) using a license-required frequency (license band) stipulated in LTE is being conducted (non-licensed) Patent Document 1).

  In Non-Patent Document 1, in order to perform effective communication, a measurement method of RSSI (Received Signal Strength Indicator) related to interference and noise has been studied.

R2-152480, Ericsson, 3GPP TSG RAN WG2 Meeting # 90, 25th-29th May 2015.

  In a communication device (terminal device and / or base station device), there are cases where efficient communication cannot be performed only by the conventional measurement and reporting method.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a terminal device, a base station device, and a method capable of performing measurement and reporting for efficient communication. .

  (1) In order to achieve the above object, the present invention takes the following measures. That is, a terminal device according to an aspect of the present invention is a terminal device that communicates with a base station device, and the measurement object setting includes a first setting related to a histogram of RSSI (Received Signal Strength Indicator). And a receiving unit that determines the total number of resources used for generating a resource and a resource for measuring RSSI based on the setting of 1. The receiving unit classifies the RSSI in each resource based on the measured value. Then, a histogram at each level is generated.

  (2) Moreover, the base station apparatus by one aspect | mode of this invention is a base station apparatus which communicates with a terminal device, Comprising: The measurement object setting containing the 1st setting regarding the histogram of RSSI (Received Signal Strength Indicator) is high-order. The transmitter includes a transmission unit that uses a layer signal, and the first setting includes at least a measurement period.

  (3) A method according to an aspect of the present invention is a method in a terminal apparatus that communicates with a base station apparatus, and the measurement object setting includes a first setting relating to a histogram of RSSI (Received Signal Strength Indicator). In this case, based on the first setting, a step of determining a resource for measuring RSSI, a total number of resources used for generating a histogram, and the receiving unit determines the RSSI in each resource based on the measured value. Leveling and generating a histogram at each level.

  (4) A method according to an aspect of the present invention is a method in a base station device that communicates with a terminal device, and includes a measurement object setting including a first setting related to a histogram of RSSI (Received Signal Strength Indicator). Transmitting using a layer signal, and including at least a measurement period in the first setting.

  According to the present invention, transmission efficiency can be improved in a wireless communication system in which a base station device and a terminal device communicate.

It is a figure which shows an example of a radio frame structure of the downlink which concerns on 1st Embodiment. FIG. 3 is a diagram illustrating an example of an uplink radio frame configuration according to the first embodiment. It is a figure which shows an example of the block configuration of the base station apparatus which concerns on 1st Embodiment. It is a figure which shows an example of the block configuration of the terminal device which concerns on 1st Embodiment. It is a figure which shows the outline | summary of the measurement point which concerns on 1st Embodiment.

<First Embodiment>
A first embodiment of the present invention will be described below. A base station apparatus (base station, Node B, eNB (EUTRAN NodeB)) and a terminal apparatus (terminal, mobile station, user apparatus, UE (User equipment)) will be described using a communication system that communicates in a cell.

  The main physical channels and physical signals used in EUTRA and A-EUTRA will be described. A channel means a medium used for signal transmission, and a physical channel means a physical medium used for signal transmission. In this embodiment, a physical channel can be used synonymously with a signal. The physical channel may be added in the future in EUTRA and A-EUTRA, or the structure and format of the physical channel may be changed or added. However, even when the physical channel is changed or added, the description of each embodiment of the present invention is given. Does not affect.

  In EUTRA and A-EUTRA, scheduling of physical channels or physical signals is managed using radio frames. One radio frame is 10 ms, and one radio frame is composed of 10 subframes. Further, one subframe is composed of two slots (that is, one subframe is 1 ms, and one slot is 0.5 ms). Also, resource blocks are used as a minimum scheduling unit in which physical channels are allocated. A resource block is defined by a constant frequency region composed of a set of a plurality of subcarriers (for example, 12 subcarriers) and a region composed of a constant transmission time interval (1 slot) on the frequency axis. One subframe may be referred to as one resource block pair.

  There are two types of HD-FDD. For type A HD-FDD operation, the guard period is not received by the terminal device by not receiving the tail part (tail symbol) of the downlink subframe immediately before the uplink subframe from the same terminal device. Generated. For type B HD-FDD operation, the guard period, referred to as the HD guard subframe, is the same by not receiving the downlink subframe immediately preceding the uplink subframe from the same terminal device and the same It is generated by the terminal device by not receiving the downlink subframe immediately after the uplink subframe from the terminal device. That is, in the HD-FDD operation, the terminal apparatus generates a guard period by controlling the downlink subframe reception process. Note that the symbol may include either an OFDM symbol or an SC-FDMA symbol.

  Frame structure type 2 can apply TDD. Each radio frame is composed of two half frames. Each half frame is composed of five subframes. The UL-DL configuration in a cell may change between radio frames, and control of subframes in uplink or downlink transmission may occur in the latest radio frame. The UL-DL configuration in the latest radio frame can be obtained via PDCCH or higher layer signaling. The UL-DL setting indicates the configuration of an uplink subframe, a downlink subframe, and a special subframe in TDD. The special subframe includes DwPTS capable of downlink transmission, guard period (GP), and UpPTS capable of uplink transmission. The configurations of DwPTS and UpPTS in the special subframe are managed in a table, and the terminal device can acquire the configuration via higher layer signaling. The special subframe is a switching point from the downlink to the uplink.

  A terminal device used for LAA communication according to the present invention may be referred to as an LAA terminal in order to distinguish it from a terminal device such as a mobile phone. In the present invention, the terminal device includes an LAA terminal. The LAA terminal is an LTE terminal specialized / limited to a specific function. Here, a conventional LTE terminal, that is, an LTE terminal that does not support a function related to LAA is simply referred to as an LTE terminal. Similarly, a base station apparatus that supports the LAA function may be referred to as an LAA base station, and a base station apparatus that does not support the LAA function may be referred to as an LTE base station.

  A terminal device and a base station device that perform LAA communication may perform communication in a frequency band that does not require a license.

  The frequency at which LAA communication is possible may be set as an operating band. For example, in the operating band, a range (that is, a frequency band) of a frequency (uplink frequency and / or downlink frequency) corresponding to an index is associated with a duplex mode. That is, these parameters may be managed in a table. The operating band may also be associated with an offset value that determines a center frequency (carrier frequency). The terminal apparatus can determine which frequency belongs to which band index based on the offset value. For example, in the case of index 33, the corresponding frequency range is 1900 MHz to 1920 MHz, and the duplex mode is TDD. Based on the offset value, the center frequency can be set in increments of 0.1 MHz.

  The operating band corresponding to the LAA may be managed together with the EUTRA operating band table. For example, the EUTRA operating band index may be managed from 1 to 44, and the operating band index corresponding to LAA (or LAA frequency) may be managed from 252 to 255. For example, in the indexes 252 to 255, only the downlink frequency band may be defined. Further, in some indexes, an uplink frequency band may be reserved in advance as reserved or specified in the future. Further, the corresponding duplex mode may be a duplex mode different from FDD or TDD, or may be FDD or TDD. The frequency capable of LAA communication is preferably 5 GHz or more, but may be 5 GHz or less. That is, LAA communication is performed at an associated frequency as an operating band corresponding to LAA.

  The operating band corresponding to LAA may be managed by a table different from the table of EUTRA operating band. The range (ie, frequency band) of the corresponding frequency (uplink frequency and / or downlink frequency) and duplex mode may also be individually associated with the EUTRA operating band index. Furthermore, the offset value for determining the center frequency may also be set separately from the offset value corresponding to the EUTRA operating band.

  In order to realize LAA communication, the number and functions of various processing units (transmission unit, reception unit, control unit, etc.) provided in a communication device (terminal device and / or base station device, device, module) are the same as conventional LTE terminals. It may be expanded compared with. For example, an RF (Radio Frequency) unit, an IF (Intermediate Frequency) unit, and a baseband unit that are used in the transmission unit and the reception unit may be extended so that they can be transmitted and received simultaneously in a plurality of bands. Filter unit, SC-FDMA (Single Carrier-Frequency Division Multiple Access) signal transmitter / receiver, OFDM signal transmitter / receiver, uplink subframe generator, downlink subframe generator, used for transmitter and receiver The bandwidth (number of resource blocks and number of subcarriers (resource elements)) supported by the unit may be expanded.

  Compared with the LTE terminal, the LAA terminal may have a complicated configuration of a transmission unit (transmission circuit) and a reception unit (reception circuit). For example, the number of RF units (RF circuits) and the number of transmission antennas / reception antennas (antenna ports) may be larger than that of LTE terminals. In addition, LAA terminals may be supported with functions that are extended compared to LTE terminals. In addition, the LAA terminal may support a wider bandwidth (transmission / reception bandwidth, measurement bandwidth, channel bandwidth) than the LTE terminal. For example, in the LAA terminal, a function related to filtering may be extended.

  The base station apparatus may determine that the terminal apparatus is an LAA device based on LCID (Logical Channel ID) for CCCH (Common Control Channel) and function information (performance information) of the terminal apparatus.

  S1 signaling is extended to include terminal radio function information for paging. When this paging-specific function information is provided by the base station device to the MME (Mobility Management Entity), the MME uses this information to instruct the base station device that the paging request from the MME relates to the LAA terminal. May be. The identifier may be referred to as ID (Identity, Identifier).

  The terminal device function information (UE radio access capability, UE EUTRA capability) starts the procedure for the terminal device in the connection mode when the base station device (EUTRAN) needs the function information of the terminal device. The base station apparatus inquires about the function information of the terminal apparatus, and transmits the function information of the terminal apparatus in response to the inquiry. The base station apparatus determines whether or not the function information is supported, and if so, transmits the setting information corresponding to the function information to the terminal apparatus using higher layer signaling or the like. When the setting information corresponding to the function information is set, the terminal device determines that transmission / reception based on the function is possible.

  FIG. 1 is a diagram illustrating an example of a downlink radio frame configuration according to the present embodiment. An OFDM access scheme is used for the downlink. In the downlink, PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced PDCCH), PDSCH (Physical Downlink Shared Channel) and the like are allocated. The downlink radio frame is composed of a downlink resource block (RB) pair. This downlink RB pair is a unit such as downlink radio resource allocation, and is based on a predetermined frequency band (RB bandwidth) and time band (2 slots = 1 subframe). Become. One downlink RB pair is composed of two downlink RBs (RB bandwidth × slot) that are continuous in the time domain. One downlink RB is composed of 12 subcarriers in the frequency domain. Also, in the time domain, when a normal cyclic prefix (NCP: Normal CP) is added, seven are added, and when a cyclic prefix longer than normal (ECP: Extended CP) is added, six are added. Of OFDM symbols. A region defined by one subcarrier in the frequency domain and one OFDM symbol in the time domain is referred to as a resource element (RE). PDCCH / EPDCCH is a physical channel through which downlink control information (DCI) such as terminal device identifier, PDSCH scheduling information, PUSCH (Physical Uplink Shared Channel) scheduling information, modulation scheme, coding rate, retransmission parameters, etc. is transmitted. is there. In addition, although the downlink sub-frame in one component carrier (CC) is described here, a downlink sub-frame is prescribed | regulated for every CC, and a downlink sub-frame is substantially synchronized between CC.

  Although not shown here, SS (Synchronization Signal), PBCH (Physical Broadcast Channel), and DLRS (Downlink Reference Signal) may be arranged in the downlink subframe. As DLRS, CRS (Cell-specific Reference Signal) transmitted on the same antenna port (transmission port) as PDCCH, CSI-RS (Channel State Information Reference Signal) used for measurement of channel state information (CSI), part There are UERS (UE-specific Reference Signal) transmitted through the same antenna port as the PDSCH, and DMRS (Demodulation Reference Signal) transmitted through the same transmission port as the EPDCCH. Moreover, the carrier in which CRS is not arrange | positioned may be sufficient. At this time, in some subframes (for example, the first and sixth subframes in the radio frame), a part of the CRS antenna ports (for example, antenna port 0) are used as time and / or frequency tracking signals. Only) or a signal similar to a signal corresponding to all antenna ports (referred to as an extended synchronization signal) can be inserted. Here, the antenna port may be referred to as a transmission port. Here, “physical channel / physical signal is transmitted through an antenna port” includes the meaning that a physical channel / physical signal is transmitted using a radio resource or layer corresponding to the antenna port. For example, the reception unit means receiving a physical channel or a physical signal from a radio resource or layer corresponding to the antenna port.

  FIG. 2 is a diagram illustrating an example of an uplink radio frame configuration according to the present embodiment. The SC-FDMA scheme is used for the uplink. In the uplink, PUSCH (Physical Uplink Shared Channel), PUCCH (Physical Uplink Control Channel), and the like are allocated. Further, ULRS (Uplink Reference Signal) is assigned together with PUSCH and PUCCH. The uplink radio frame is composed of uplink RB pairs. This uplink RB pair is a unit for allocation of uplink radio resources and the like, from a frequency domain (RB bandwidth) and a time domain (2 slots = 1 subframe) having a predetermined width. Become. One uplink RB pair is composed of two uplink RBs (RB bandwidth × slot) that are continuous in the time domain. One uplink RB is composed of 12 subcarriers in the frequency domain. In the time domain, seven SC-FDMA symbols are added when a normal cyclic prefix (Normal CP) is added and six cyclic prefixes (Extended CP) longer than normal are added. Composed. Here, although an uplink subframe in one CC is described, an uplink subframe is defined for each CC.

  Next, physical channels and physical signals according to the present embodiment will be described. Basically, parameters related to physical channel and / or physical signal settings may be set in the terminal device via higher layer signaling as higher layer parameters. Some physical channels and / or parameters related to physical signal settings may be set in the terminal device via L1 signaling (physical layer signaling, eg, PDCCH), such as DCI format or grant. In the higher layer signaling, the type of signaling / message used for notifying the setting may be different depending on the corresponding setting such as RRC message, broadcast information, and system information.

  The synchronization signal includes three types of PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal) composed of 31 types of codes arranged alternately in the frequency domain. 504 kinds of cell identifiers (physical cell ID (PCI)) for identifying a station apparatus and frame timing for radio synchronization are shown. The terminal device specifies the physical cell ID of the synchronization signal received by the cell search. The PSS / SSS is allocated using 6 RBs (that is, 72 REs, 72 subcarriers) at the center of the transmission bandwidth (or system bandwidth). However, PSS / SSS may not be mapped for several subcarriers at both ends of 6RBs to which a PSS / SSS sequence is not allocated. That is, the terminal apparatus performs processing by regarding a resource to which a PSS / SSS sequence is not assigned as a PSS / SSS resource. In other words, in the central 6 RBs, there may be a resource to which PSS / SSS is not transmitted.

  A PBCH (Physical Broadcast Channel) is used to notify (set) control parameters (broadcast information, system information (SI)) that are commonly used by terminal devices in a cell. A radio resource in which broadcast information is transmitted on the PDCCH is notified to a terminal device in the cell, and broadcast information that is not notified on the PBCH is a layer 3 message (system information) that notifies the broadcast information on the notified radio resource on the PDSCH. ) Is sent. The TTI (repetition rate) of PBCH to which BCH (Broadcast Channel) is mapped is 40 ms.

  The PBCH is allocated using 6 RBs (that is, 72 REs, 72 subcarriers) at the center of the transmission bandwidth (or system bandwidth). The PBCH is transmitted in four consecutive radio frames starting from a radio frame satisfying SFN (system frame number, radio frame number) mod4 = 0. The PBCH scrambling sequence is initialized using PCI in each radio frame satisfying SFN (radio frame number) mod4 = 0. The number of PBCH antenna ports is the same as the number of CRS antenna ports. PDSCH is not transmitted with resources overlapping with PBCH and CRS. That is, the terminal device does not expect that PDSCH is mapped to the same resource as PBCH and CRS. Further, the base station apparatus does not transmit the PDSCH by mapping it to the same resource as the PBCH and CRS.

  PBCH is used to broadcast system control information (master information block (MIB)).

  The MIB includes system information transmitted on the BCH. For example, the system information included in the MIB includes a downlink transmission bandwidth, a PHICH setting, and a system frame number. The MIB includes 10 spare bits (bit string). Note that the downlink transmission bandwidth may be included in the mobility control information. The mobility control information may be included in information related to RRC connection reconfiguration. That is, the downlink transmission bandwidth may be set via the RRC message / upper layer signaling.

  In the present invention, the bit string may be referred to as a bitmap. The bit string may be composed of one or more bits.

  System information transmitted by other than the MIB is transmitted by a system information block (SIB). A system information message (SI message) is used to transmit one or more SIBs. All SIBs included in the SI message are transmitted in the same cycle. All SIBs are transmitted on DL-SCH (Downlink Shared Channel). DL-SCH may also be referred to as DL-SCH data or DL-SCH transport block. In the present invention, a transport block is synonymous with a transport channel.

  PDSCH resource allocation in which a DL-SCH to which an SI message is mapped is transmitted is indicated using a PDCCH with a CRC scrambled with SI-RNTI. The search space of PDCCH with CRC scrambled with SI-RNTI is CSS.

  PDSCH resource allocation in which DL-SCH to which information on the random access response is mapped is transmitted is indicated using PDCCH with CRC scrambled by RA-RNTI. The search space of PDCCH with CRC scrambled with RA-RNTI is CSS.

  The resource allocation of the PDSCH in which the PCH to which the paging message is mapped is transmitted is indicated by using the PDCCH with the CRC scrambled by the P-RNTI. The search space of PDCCH with CRC scrambled with P-RNTI is CSS. PCH may be referred to as PCH data or a PCH transport block. In the present invention, the paging message and PCH may be synonymous.

  SIB has different system information that can be transmitted for each type. That is, the information shown for each type is different.

  For example, system information block type 1 (SIB1) includes information related to estimation (evaluation, measurement) when a terminal device accesses a certain cell, and defines scheduling of other system information. For example, SIB1 is information related to cell access such as PLMN identifier list, cell identifier, CSG identifier, cell selection information, maximum power value (P-Max), frequency band indicator, SI window length, transmission cycle for SI message, Includes TDD settings.

  Upon receiving SIB1 via broadcast or via dedicated signaling, the terminal device shall be in idle mode or connected mode while T311 is activated, and the terminal device is a category 0 terminal. If there is, and SIB1 does not include information (category0Allowed) indicating that category 0 terminals are allowed to access the cell, it is considered that access to the cell is prohibited. . That is, a category 0 terminal cannot access a cell if the category 0 terminal is not permitted to access the cell in SIB1.

  For example, system information block type 2 (SIB2) includes radio resource setting information that is common to all terminal apparatuses. For example, SIB2 includes frequency information such as an uplink carrier frequency and an uplink bandwidth, information on a time adjustment timer, and the like. The SIB2 includes information related to physical channel / physical signal settings such as PDSCH, PRACH, SRS, and uplink CP length. Further, SIB2 includes information related to the setting of higher layer signaling such as RACH and BCCH.

  For example, the system information block type 3 (SIB3) includes information (parameters, parameter values) common to cell reselection within a frequency, between frequencies, and between RATs (Radio Access Technology).

  17 types of SIBs are prepared, but may be newly added / defined depending on the application.

  The SI message includes SIBs other than SIB1.

  In the PBCH, encoded BCH transport blocks are mapped in 4 subframes within a 40 ms interval. The 40 ms timing of PBCH is blind detected. That is, there is no explicit signaling to indicate 40 ms timing. Each subframe is assumed to be capable of self-decoding. That is, the BCH is assumed to be in a fairly good channel condition and can be decoded with a single reception.

  MIB (or PBCH) uses a fixed schedule that repeats within 40 ms with a 40 ms period. The first transmission of the MIB is scheduled in a subframe # 0 of a radio frame in which the remainder of dividing the system frame number (SFN) by 4 is 0 (SFN mod 4 = 0), and the subframe # of all other radio frames 0 is scheduled for repetition. That is, the information included in the MIB may be updated at a cycle of 40 ms. SFN is synonymous with a radio frame number.

  SIB1 uses a fixed schedule that repeats within 80 ms with a period of 80 ms. The first transmission of SIB1 is scheduled in subframe # 5 of the radio frame in which the remainder of SFN divided by 8 is 0 (SFN mod 8 = 0), and the remainder of SFN divided by 2 is 0 (SFN mod 2 = The repetition is scheduled in subframe # 5 of all other radio frames that become 0).

  The SI message is transmitted in a time domain window (SI window) periodically generated using dynamic scheduling (PDCCH scheduling, PDCCH with CRC scrambled SI-RNTI (System Information Radio Network Temporary Identifier)). Each SI message is associated with an SI window, and SI windows of different SI messages do not overlap. Only one corresponding SI is transmitted within one SI window. The length of the SI window is common to all SI messages and can be set. In the SI window, an MBSFN (Multimedia Broadcast Multicast Service Single Frequency Network) subframe, a TDD uplink subframe, and a subframe # 5 of a radio frame in which the remainder obtained by dividing SFN by 2 is 0 (SFN mod 2 = 0) It can be transmitted any number of times in other subframes. The terminal device captures detailed time domain scheduling (and other information such as frequency domain scheduling and transport format used) by decoding the PDCCH SI-RNTI. The SI message includes SIBs other than SIB1.

  The terminal device applies the system information acquisition procedure to acquire the AS and NAS system information broadcast by EUTRAN. This procedure is applied to a terminal device in an idle mode (idle state, RRC_IDLE) and a connection mode (connected state, RRC_CONNECTED).

  The terminal device needs to have a valid version of the necessary system information.

  If in idle mode, system information block type 8 (SIB8), which depends on the support of the associated RAT, or system information block type, which depends on the support of wireless local area network (WLAN) interworking assisted by RAN (Radio Access Network) 17, not only SIB2 but also MIB and SIB1 are required. That is, the required SIB may differ depending on the function supported by the terminal device.

  In the connection mode, MIB, SIB1, SIB2, and SIB17 are required.

  The terminal device deletes the system information three hours after confirming that the held system information is valid. That is, the terminal device does not keep the system information once held permanently. The terminal device deletes the held system information when a predetermined time elapses.

  If the terminal device is different from one of the system information holding the system information value tag included in the SIB1, the system information block type 10 (SIB10), the system information block type 11 (SIB11), and the system information block type 12 ( The stored system information except SIB12) and system information block type 14 (SIB14) is regarded as invalid.

  The PBCH is assigned to the center 6 RBs (72 REs) in the downlink bandwidth setting in the frequency domain, and in the time domain, slot 1 of subframe 0 (first subframe in the radio frame, subframe index 0). It is assigned to indexes (OFDM symbol indexes) 0 to 3 of (second slot in subframe, slot index 1). Note that the downlink bandwidth setting is represented by a multiple of the resource block size in the frequency domain, which is represented by the number of subcarriers. The downlink bandwidth setting is a downlink transmission bandwidth set in a certain cell. That is, PBCH is transmitted using 6 RBs at the center of the downlink transmission bandwidth.

  The PBCH is not transmitted using resources reserved for DLRS. That is, the PBCH is mapped avoiding DLRS resources. The PBCH mapping is performed assuming CRS for the existing antenna ports 0 to 3 regardless of actual settings. Also, the CRS resource elements of antenna ports 0 to 3 are not used for PDSCH transmission.

  As broadcast information, a cell global identifier (CGI) indicating a cell-specific identifier, a tracking area identifier (TAI) for managing a paging standby area, random access setting information (such as a transmission timing timer), and common radio resource setting information in the cell , Neighboring cell information, uplink access restriction information, etc. are notified.

  DLRS is classified into a plurality of types according to its use. For example, CRS is a pilot signal transmitted at a predetermined power for each cell, and is a DLRS that is periodically repeated in the frequency domain and the time domain based on a predetermined rule. The terminal device measures reception quality (RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality)) for each cell by receiving the CRS. The terminal apparatus may also use CRS as a reference signal for PDCCH transmitted simultaneously with CRS or for demodulation of PDSCH. As a sequence used for CRS, a sequence identifiable for each cell is used. That is, the sequence used for CRS may be set based on the cell ID.

  The DLRS is also used for estimation of downlink propagation path fluctuation (channel estimation). DLRS used for estimation of propagation path fluctuation (channel state) is referred to as CSI-RS. Also, DLRS individually set for a terminal device is referred to as UERS, DMRS, or Dedicated RS, and is referred to for channel propagation path compensation processing when demodulating EPDCCH or PDSCH. DMRS exists in both downlink and uplink, respectively. In order to facilitate identification, in the present invention, DMRS for the downlink is referred to as UERS or DL DMRS, and DMRS for the uplink is simply referred to as DMRS or UL DMRS.

  The CSI includes a reception quality index (CQI), a precoding matrix index (PMI), a precoding type index (PTI), and a rank index (RI), and a suitable modulation scheme and coding rate, and a suitable precoding matrix, respectively. , Can be used to specify (represent) a preferred PMI type, preferred rank. Each indicator may be written as Indication. Also, for CQI and PMI, wideband CQI and PMI assuming transmission using all resource blocks in one cell and some continuous resource blocks (subbands) in one cell were used. It is classified into subband CQI and PMI assuming transmission. In addition to the normal type PMI that expresses one suitable precoding matrix with one PMI, the PMI uses one type of suitable PMI, ie, the first PMI and the second PMI. There is a type of PMI that represents a recording matrix. CSI is reported using PUCCH or PUSCH. The terminal device may measure CSI based on CRS when parameters related to CSI-RS are not set or when it does not have a function of receiving / measuring CSI-RS.

  CSI-IM (Channel State Information-Interference Measurement) is performed based on zero power CSI-RS resources. Unlike the case where CSI is measured, CSI-RS of zero power used for CSI-IM is not transmitted from the connected base station apparatus (cell). That is, the terminal apparatus uses interference resources and noise power of adjacent cells (that is, signals transmitted from the base station apparatus and / or the terminal apparatus belonging to the adjacent cell (non-serving cell) using resources to which CSI-RS is not mapped. Power and noise power). The CSI is measured using non-zero power CSI-RS resources. Zero power CSI-RS resources and non-zero power CSI-RS resources are individually configured using higher layer parameters. The resource is set based on an index indicating which resource element in one resource block is used, a transmission subframe, a transmission cycle (measurement subframe and measurement cycle), or a subframe pattern. In the case of a subframe pattern, a subframe to which a zero-power CSI-RS resource is allocated is indicated by using a 16-bit bit string. “1” is set for a subframe to which a zero power CSI-RS resource is allocated. Note that the terminal device does not expect that zero power and non-zero power CSI-RS resources are set in the same subframe of a serving cell as a PMCH (Physical Multicast Channel). In addition, the setting regarding the CSI-RS resource of zero power may be set to be used for purposes other than CSI-IM.

  Also, in the subframe pattern, for the serving cell of frame structure type 1, the terminal device sets any one of the lower 6 bits of 16 bits for NCP to “1” and 16 for ECP. It is not expected that any one of the lower 8 bits of the bit is set to “1”. In addition, for a 4CRS port in a serving cell of frame structure type 2, one of the lower 6 bits of 16 bits for NCP is set to “1”, and the terminal device is set to 16 bits for ECP. Do not expect any one of the lower 8 bits to be set to "1".

  DS (Discovery Signal (s)) is used for time-frequency synchronization, cell identification, and RRM (Radio Resource Management) measurement (intra and / or inter frequency measurement) at a frequency for which a parameter related to DS is set. The DS is composed of a plurality of signals, and these signals are transmitted in the same cycle. The DS is configured using PSS / SSS / CRS resources, and may be further configured using CSI-RS resources. In DS, RSRP and RSRQ may be measured using resources to which CRS and CSI-RS are mapped. The timing (measurement subframe and measurement period) for measuring the DS is determined based on parameters included in DMTC (DS Measurement Timing Configuration). The DS measurement period is set to 40 ms, 80 ms, 120 ms, and multiples of 40 ms. Further, the DS measurement subframe may be associated with the measurement period (transmission period) and set as an individual parameter. The measurement subframe may be a subframe offset with respect to the subframe 0 of the system frame number 0. Further, the measurement subframe may be set based on a subframe offset with respect to a subframe corresponding to subframe 0 within the measurement period. The RRM measurement includes at least one measurement of RSRP, RSRQ, and RSSI. The DS may be referred to as DRS (Discovery Reference Signal (s)). Note that parameters related to DMTC (subframe offset and cycle settings) are included in the measurement DS settings.

  The terminal device can know the start position (subframe start position) of the DS occasion where the DS may be transmitted by the DMTC setting. The length of the DS occasion is fixed (for example, 6 subframes). In the subframe in the DS occasion, the period of the subframe in which the DS is actually transmitted is set to the measurement DS setting as the DS duration (DS occasion duration). The CRS included in the DS may be transmitted in all subframes within the DS duration. Furthermore, when the parameter regarding CSI-RS is contained in the measurement DS setting, the terminal device can measure CSI-RSRP. Note that the measurement DS setting may be included in the measurement object setting. That is, when the measurement object setting includes the measurement DS setting, the terminal device can measure the DS based on DMTC. Based on the DS duration, the terminal device monitors the DS from the first subframe of the DS occasion. The terminal device monitors the corresponding DS (CRS and CSI-RS) based on the duration from the subframe in which the PSS / SSS included in the DS is detected.

  The CRS included in the DS may be mapped to all subframes within the duration.

  Zero or more resources may be set for the CSI-RS included in the DS. The CSI-RS included in the DS may be managed as a list. The ID included in the list and the CSI-RS resource setting may be associated with each other. That is, there may be a plurality of CSI-RSs included in one DS (one duration).

  The DS is transmitted from the base station apparatus constituting the cell that can be activated / deactivated (on / off) (that is, using the frequency of the cell that can be activated / deactivated (on / off)). Also good.

  In the present invention, the duration is synonymous with one or more consecutive subframes or symbols. Also, the duration may be referred to as a burst. That is, a burst is synonymous with one or more consecutive subframes or symbols. The unit used for the duration may be determined based on the set parameters.

  The measurement period and the measurement subframe are parameters related to measurement in the terminal device, but are also parameters related to transmission in the base station device. Further, the parameter related to reception in the terminal device may be a parameter related to transmission in the base station device at the same time. That is, the base station apparatus may transmit a corresponding downlink signal based on parameters set in the terminal apparatus. Further, the parameter related to transmission in the terminal device may be a parameter related to reception or measurement in the base station device. That is, the base station apparatus may receive a corresponding uplink signal based on parameters set in the terminal apparatus.

  The CSI-RS setting included in the measurement DS setting includes an ID (measurement CSI-RS ID) associated with the measured CSI-RS, a physical layer cell ID and scrambling ID used for sequence generation, and CSI. There are resource settings for determining RS time-frequency resources (a pair of resource elements), a subframe offset indicating a subframe offset with SSS, and a power offset individually set for CSI-RS.

  The measurement DS setting includes an ID addition change list and a deletion list corresponding to the CSI-RS setting. The terminal apparatus measures the CSI-RS resource related to the ID of the measurement CSI-RS set in the addition / change list. Further, the terminal device stops measuring the CSI-RS resource related to the ID of the measurement CSI-RS set in the deletion list.

  The DS occasion for a cell (frequency) has a period with a duration of 1 to 5 consecutive subframes for frame structure type 1 and 2 to 5 consecutive subframes for frame structure type 2. It consists of a cycle with a duration of. In the period and the duration, the terminal device assumes the presence of DS and performs measurement.

  The CRS constituting the DS (or included in the subframe of the DS occasion) is mapped to the antenna port 0 resource in the DwPTS of all downlink subframes and special subframes in the period. Note that “comprising a DS” may be synonymous with “included in a subframe of a DS occasion”.

  The PSS included in the DS is mapped to the first subframe of the period for frame structure type 1 and to the second subframe of the period for frame structure type 2.

  The SSS included in the DS is mapped to the first subframe of that period.

  When the DS is included in the measurement object for the LAA frequency, the corresponding PSS / SSS resource of the DS may be shifted in the frequency direction and mapped. The shift amount may be determined based on a predetermined ID such as a cell ID or a value set by an upper layer. Also, if the DS is included in the measurement object for the LAA frequency, the corresponding DS PSS / SSS resources and sequences may be extended based on the measurement bandwidth.

  In the CSI-RS included in the DS, non-zero power resources are mapped to zero or more subframes in the period.

  The terminal device may perform the measurement assuming that there is one DS occasion for each DMTC period.

  In the LAA frequency, an initial signal and a reservation signal may be transmitted from the base station device and / or the terminal device.

  The initial signal is a signal used to indicate a transmission start position of a data signal (PDSCH or PUSCH), a control signal (PDCCH or PUCCH), or a reference signal (DLRS or ULRS). The initial signal is also called a preamble. That is, if the terminal device or the base station device receives the initial signal, it can receive the subsequent data signal and control signal.

  When the reservation signal is LBT and it is determined that the channel is clear, the energy exceeding the threshold value indicates that the channel is occupied so that other base station devices and terminal devices are not interrupted. Send a signal with. There is no need to map data to the reservation signal itself.

  The initial signal may serve as a reservation signal. Further, control information may be mapped to the initial signal. The initial signal may be used for time frequency synchronization and cell identification.

  The initial signal and / or the reservation signal may be used for setting of AGC (Auto Gain Control).

  The terminal apparatus periodically transmits DS and PSS / SSS / CRS / CSI-RS (a signal transmitted periodically other than DS) based on whether or not LBT is performed in the base station apparatus. It may be determined whether or not. When the LBT is performed in the base station apparatus, the terminal apparatus estimates that the DS is not periodically transmitted, and measures the DS.

  When transmitting a DS at the LAA frequency, the base station apparatus may map data information and / or control information in the DS occasion. The data information and / or control information may include information regarding the LAA cell. For example, the data information and / or control information may include the frequency to which the LAA cell belongs, the cell ID, the load and congestion status, the interference / transmission power, the channel exclusive time, and the buffer status regarding transmission data.

  When the DS is measured at the LAA frequency, the resources used for each signal included in the DS may be extended. For example, CRS may use not only the antenna port 0 but also resources corresponding to the antenna ports 2 and 3. Also, for CSI-RS, not only the antenna port 15 but also resources corresponding to the antenna ports 16 and 17 may be used.

  The PDCCH is transmitted in several OFDM symbols (for example, 1 to 4 OFDM symbols) from the top of each subframe. EPDCCH is a PDCCH arranged in an OFDM symbol in which PDSCH is arranged. The parameter regarding EPDCCH may be set as an upper layer parameter via an RRC message (upper layer signaling). The PDCCH or EPDCCH is used for the purpose of notifying the terminal apparatus of radio resource allocation information according to the scheduling of the base station apparatus, information for instructing an adjustment amount for increase / decrease of transmission power, and other control information. That is, the PDCCH / EPDCCH is used to transmit DCI (or a certain DCI format composed of at least one DCI). In each embodiment of the present invention, when only PDCCH is described, it means both PDCCH and EPDCCH physical channels unless otherwise specified.

  The PDCCH is used to notify a terminal apparatus (UE) and a relay station apparatus (RN) of resource allocation of PCH (Paging Channel) and DL-SCH and HARQ information (DL HARQ) regarding the DL-SCH. The PDCCH is used to transmit an uplink scheduling grant and a side link scheduling grant. That is, the PDCCH is used to transmit DCI indicating resource allocation for PCH and / or DL-SCH (resource allocation for PDSCH) and DCI indicating HARQ-ACK for PCH and / or DL-SCH. The terminal device detects PDSCH to which PCH or DL-SCH is mapped based on the DCI.

  DCI indicating resource allocation of PCH and / or DL-SCH includes information on PDSCH resource allocation / information on virtual resource allocation (information on resource block allocation), UERS or DMRS antenna port and layer used for PDSCH demodulation Information on the number of items may be included.

  DCI indicating HARQ-ACK for PCH and / or DL-SCH includes information on modulation and coding scheme, information indicating initial transmission or retransmission of PCH or DL-SCH transport block, start point in circular buffer (stored Information (Redundancy Version) indicating data (HARQ soft buffer reading start position), used for TDD HARQ-ACK procedure considering the possibility of HARQ protocol errors such as erroneous transmission of ACK and detection error of PDCCH, Information on DAI (Downlink Assignment Index) (information on HARQ-ACK subframe for PUSCH (UL-SCH), information on HARQ-ACK subframe for PDSCH (PCH or DL-SCH)) may be included. .

  The EPDCCH is used for notifying a terminal apparatus (UE) of DL-SCH resource allocation and HARQ information related to the DL-SCH. Moreover, EPDCCH is used in order to transmit an uplink scheduling grant and a side link scheduling grant.

  The PDCCH is transmitted by aggregating one or several consecutive CCEs (Control Channel Elements). One CCE corresponds to nine resource element groups (REG). The number of CCEs that can be used in the system is determined by excluding physical control format indicator channels (PCFICH (Physical Control Format Indicator Channel) and PHICH (Physical HARQ Indicator Channel). PDCCH has a plurality of formats (PDCCH formats). Each PDCCH format defines the number of CCEs, the number of REGs, and the number of PDCCH bits, and one REG is composed of 4 REs, that is, 1 PRB may include up to 3 REGs. The PDCCH format is determined according to the size of the DCI format.

  Since a plurality of PDCCHs are collectively modulated and encoded and then mapped to the entire downlink transmission bandwidth, the terminal device continues to decode until it detects a PDCCH addressed to itself. That is, the terminal device cannot detect the PDCCH even if it receives only a part of the frequency domain and performs the demodulation and decoding process. The terminal device cannot correctly detect the PDCCH (PDCCH candidate) addressed to itself until it receives all the PDCCHs mapped over the entire downlink transmission bandwidth.

  A plurality of PDCCHs may be transmitted in one subframe. PDCCH is transmitted through the same set of antenna ports as PBCH. EPDCCH is transmitted from an antenna port different from PDCCH.

  The terminal device monitors (monitors) the PDCCH addressed to itself before transmitting / receiving the downlink data (DL-SCH) and the layer 2 message and the layer 3 message (paging, handover command, etc.) which are higher layer control information. By receiving the PDCCH addressed to itself, it is necessary to acquire radio resource allocation information called an uplink grant at the time of transmission and a downlink grant (downlink assignment) at the time of reception from the PDCCH. The PDCCH may be configured to be transmitted in the resource block area individually allocated from the base station apparatus to the terminal apparatus, in addition to the above-described OFDM symbol.

  DCI is transmitted in a specific format. The formats indicating the uplink grant and the downlink grant are transmitted in different formats. For example, the terminal device can acquire an uplink grant from DCI format 0 and can acquire a downlink grant from DCI format 1A. Further, there are a DCI format (DCI format 3 / 3A) including only DCI indicating a transmission power control command for PUSCH or PUCCH, a DCI format including DCI indicating UL-DL setting (DCI format 1C), and the like. For example, radio resource allocation information for PUSCH and PDSCH is a kind of DCI.

  The terminal apparatus can set various parameters of the corresponding uplink signal and downlink signal based on the detected DCI (value set in the field of the detected DCI), and perform transmission / reception. For example, when DCI related to PUSCH resource allocation is detected, the terminal apparatus can perform PUSCH resource allocation based on the DCI and transmit the DCSCH. Further, when a transmission power control command (TPC command) for the PUSCH is detected, the terminal device can adjust the transmission power of the PUSCH based on the DCI. Further, when DCI related to PDSCH resource allocation is detected, the terminal apparatus can receive PDSCH from the resource indicated based on the DCI.

  The terminal device can acquire (discriminate) various DCIs (DCI formats) by decoding a PDCCH with a CRC (Cyclic Redundancy Check) scrambled by a specific RNTI (Radio Network Temporary Identifier). Which RNTI scrambles the PDCCH with the CRC is set by the higher layer.

  Control information transmitted on the DL-SCH or PCH corresponding to the PDCCH differs depending on which RNTI is used for scrambling. For example, when scrambled by P-RNTI (Paging RNTI), information related to paging is transmitted by the PCH. In addition, when scrambled by SI-RNTI (System Information RNTI), system information may be transmitted using the DL-SCH.

  The DCI format is mapped to a search space (CSS (Common Search Space), UESS (UE-specific SS)) provided by a specific RNTI. The search space is defined as a set of PDCCH candidates to be monitored. That is, in each embodiment of the present invention, monitoring the search space is synonymous with monitoring the PDCCH. In addition, CSS and UESS in PCell may overlap. Only EPESS may be defined in EPDCCH.

  RNTI that scrambles CRC includes RA-RNTI, C-RNTI, SPS C-RNTI, temporary C-RNTI, eIMTA-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI, M-RNTI, P-RNTI, There is SI-RNTI. RA-RNTI, C-RNTI, SPS C-RNTI, eIMTA-RNTI, TPC-PUCCH-RNTI, and TPC-PUSCH-RNTI are set from the base station apparatus to the terminal apparatus via higher layer signaling. M-RNTI, P-RNTI, and SI-RNTI correspond to one value. For example, P-RNTI corresponds to PCH and PCCH and is used to notify changes in paging and system information. SI-RNTI corresponds to DL-SCH and BCCH, and is used for reporting system information. RA-RNTI corresponds to DL-SCH and is used for a random access response. RA-RNTI, C-RNTI, SPS C-RNTI, temporary C-RNTI, eIMTA-RNTI, TPC-PUCCH-RNTI, and TPC-PUSCH-RNTI are configured using higher layer signaling. Predetermined values are defined for M-RNTI, P-RNTI, and SI-RNTI.

  The PDCCH with CRC scrambled by each RNTI may have a different transport channel or logical channel depending on the value of the RNTI. That is, the information shown may differ depending on the value of RNTI.

  One SI-RNTI is used to address SIB1 like all SI messages.

  PHICH is used to transmit HARQ-ACK / NACK (NAK) in response to uplink transmission.

  PCFICH is used to notify the terminal device and the relay station device regarding the number of OFDM symbols used for PDCCH. PCFICH is transmitted for each downlink subframe or special subframe.

  PDSCH is used for notifying downlink terminal (DL-SCH data, DL-SCH transport block) and broadcast information (system information) not notified by PCH or PBCH to the terminal device as a layer 3 message. The radio resource allocation information of PDSCH is indicated using PDCCH. The PDSCH is transmitted after being arranged in an OFDM symbol other than the OFDM symbol through which the PDCCH is transmitted. That is, PDSCH and PDCCH are time division multiplexed (TDM) within one subframe. However, PDSCH and EPDCCH are frequency division multiplexed (FDM) within one subframe.

  In addition, PDSCH may be used to broadcast system control information.

  The PDSCH may be used as paging when the network does not know the location cell of the terminal device. That is, PDSCH may be used to transmit paging information or system information change notification.

  The PDSCH may be used to transmit control information between the terminal device and the network to a terminal device (an idle mode terminal device) that does not have an RRC connection with the network.

  The PDSCH may be used to transmit dedicated control information between the terminal device and the network to the terminal device having RRC connection (terminal device in connection mode).

  The PDSCH is used to transmit a transport block corresponding to the RNTI added to the PDCCH. For example, the DL-SCH related to the random access response is mapped to the PDSCH in which resource allocation is indicated by the PDCCH with the CRC scrambled by the RA-RNTI. Also, the PCSCH related to the paging information is mapped to the PDSCH in which resource allocation is indicated by the PDCCH with the CRC scrambled by the P-RNTI. Also, the DL-SCH associated with the SIB is mapped to the PDSCH in which resource allocation is indicated by the PDCCH with the CRC scrambled by the SI-RNTI. Also, the DL-SCH related to the RRC message may be mapped to the PDSCH in which resource allocation is indicated by the PDCCH with the CRC scrambled by the temporary C-RNTI.

  PUCCH is a downlink data reception confirmation response (HARQ-ACK; Hybrid Automatic Repeat reQuest-Acknowledgement or ACK / NACK (or ACK / NAK); Acknowledgement / Negative Acknowledgment report of Acknowledgement / Negative Acknowledgment) This is used to make an uplink radio resource allocation request (radio resource request, scheduling request (SR)). That is, the PUCCH is used to transmit HARQ-ACK / NACK, SR, and CSI reports that respond to downlink transmission. The PUCCH supports a plurality of formats according to the type of uplink control information (UCI) such as HARQ-ACK, CSI, and SR to be transmitted. For PUCCH, a resource allocation method and a transmission power control method are defined for each format. PUCCH uses 1 RB in each of two slots of one subframe. That is, PUCCH is composed of 1 RB regardless of the format. Moreover, PUCCH does not need to be transmitted by UpPTS of a special subframe.

  When the PUCCH is transmitted in the SRS subframe, in the PUCCH format to which the shortened format is applied (for example, formats 1, 1a, 1b, 3), the last one symbol or 2 to which the SRS may be allocated. The symbol (one or two symbols at the end of the second slot in the subframe) is emptied.

  One RB of each slot may support a mix of PUCCH format 1 / 1a / 1b and PUCCH format 2 / 2a / 2b. That is, the terminal apparatus may transmit the PUCCH format 1 / 1a / 1b and the PUCCH format 2 / 2a / 2b with 1 RB.

  PUSCH mainly transmits uplink data (UL-SCH data, UL-SCH transport block) and control data, and uplink control information (UCI) such as CSI, ACK / NACK (HARQ-ACK), and SR. It can also be included. In addition to uplink data, it is also used to notify the base station apparatus of layer 2 messages and layer 3 messages, which are higher layer control information. Similarly to the downlink, PUSCH radio resource allocation information is indicated by PDCCH (PDCCH with DCI format). When PUSCH is transmitted in an SRS subframe, if the PUSCH resource overlaps with the SRS bandwidth, the last one symbol or two symbols to which the SRS may be allocated (the last slot in the second slot in the subframe) 1 symbol or 2 symbols of the tail) is emptied.

  ULRS (Uplink Reference Signal) is a DMRS (Demodulation Reference Signal) used by the base station apparatus to demodulate PUCCH and / or PUSCH, and the base station apparatus mainly determines the uplink channel state or transmission timing. SRS (Sounding Reference Signal) used for estimation / measurement is included. In addition, SRS includes P-SRS (Periodic SRS) transmitted periodically and A-SRS (Aperiodic SRS) transmitted when instructed by the base station apparatus. P-SRS is referred to as trigger type 0 SRS, and A-SRS is referred to as trigger type 1 SRS. The SRS is assigned to the last symbol of the subframe with one symbol or two symbols. A subframe in which SRS is transmitted may be referred to as an SRS subframe. The SRS subframe is determined based on a cell-specific subframe setting and a terminal device-specific subframe setting. When transmitting a PUSCH in a subframe set to a cell-specific subframe setting, all terminal apparatuses in the cell do not allocate a PUSCH resource to the last symbol of the subframe. In the case of PUCCH, if the shortened format is applied, in the SRS subframe set based on the cell-specific subframe configuration, the PUCCH resource is not allocated to the last symbol of the subframe. However, the shortened format may not be applied depending on the PUCCH format. In that case, PUCCH may be transmitted in a normal format (that is, PUCCH resources are allocated to SRS symbols). In the case of PRACH, priority is given to transmission of PRACH. If the SRS symbol is on the PRACH guard time, the SRS may be transmitted. Note that ULRS may be referred to as an uplink pilot channel or pilot signal.

  P-SRS is transmitted when an upper layer parameter related to P-SRS is set, whereas A-SRS is set to an upper layer parameter related to A-SRS and is included in the DCI format. Based on the value set in the SRS request for requesting transmission of SRS (A-SRS), A-SRS is transmitted in the latest SRS subframe after a predetermined subframe from the downlink subframe that received the SRS request. It is determined whether or not to do so.

  A PRACH (Physical Random Access Channel) is a channel used for notifying (setting) a preamble sequence and has a guard time. The preamble sequence is configured to notify information to the base station apparatus by a plurality of sequences. For example, when 64 types of sequences are prepared, 6-bit information can be indicated to the base station apparatus. The PRACH is used as an access means (such as initial access) to the base station apparatus of the terminal apparatus. The PRACH is used for transmitting a random access preamble.

  The terminal apparatus transmits transmission timing adjustment information (timing advance (TA)) required for an uplink radio resource request when the PUCCH is not set for the SR or for matching the uplink transmission timing with the reception timing window of the base station apparatus. PRACH is used for requesting the base station apparatus (also called a command). Further, the base station apparatus can request the terminal apparatus to start a random access procedure using the PDCCH (referred to as a PDCCH order).

  Next, cell search according to the present embodiment will be described.

  The cell search is a procedure for performing time-frequency synchronization of a certain cell and detecting the cell ID of the cell. EUTRA cell search supports a full scalable transmission bandwidth corresponding to 72 subcarriers or more. EUTRA cell search is performed on the downlink based on PSS and SSS. The PSS and SSS are transmitted using 72 subcarriers at the center of the bandwidth of the first subframe and the sixth subframe of each radio frame. The adjacent cell search is performed based on the same downlink signal as the initial cell search.

  Next, measurement of the physical layer according to the present embodiment will be described.

  For example, physical layer measurements include intra-frequency and inter-frequency EUTRAN measurements (RSRP / RSRQ), terminal device reception and transmission time differences, and terminal device positioning time difference measurement (RSTD). There are measurements related to inter-RAT (EUTRAN-GERAN / UTRAN) and measurements related to inter-system (EUTRAN-non-3GPP RAT). The physical layer measurement is performed in order to support mobility. In addition, the EUTRAN measurement includes a measurement performed by an idle mode terminal device and a measurement performed by a connection mode terminal device. The terminal device performs EUTRAN measurement in an appropriate measurement gap and is synchronized with the cell in which the EUTRAN measurement is performed. Since these measurements are performed by the terminal device, they may be referred to as terminal device measurements.

  The terminal device may support at least two physical quantities (RSRP, RSRQ) for measurement in EUTRAN. Further, the terminal device may support a physical quantity related to RSSI. The terminal device may perform a corresponding measurement based on a parameter relating to a physical quantity set as an upper layer parameter.

  Physical layer measurements are made to support mobility. For example, intra-frequency and inter-frequency measurement in EUTRAN (RSRP / RSRQ), time difference between reception and transmission of terminal device, measurement of reference signal time difference used for positioning of terminal device (RSTD), and inter RAT (EUTRAN-GERAN) / UTRAN) and intersystem (EUTRAN-non-3GPP RAT) measurement. For example, physical layer measurements include measurements for intra and inter frequency handovers, measurements for inter RAT handovers, timing measurements, measurements for RRM, and measurements for positioning if positioning is supported. Note that the measurement for inter-RAT handover is defined in support of handover to GSM (registered trademark) UTRA FDD, UTRA TDD, CDMA2000, 1xRTT, CDMA2000 HRPD, IEEE 802.11. EUTRAN measurements are also used to support mobility. In addition, the EUTRAN measurement includes a measurement performed by an idle mode terminal device and a measurement performed by a connection mode terminal device. For example, RSRP and RSRQ may be measured in any mode of terminal apparatus for each of intra and inter frequencies. The terminal device performs EUTRAN measurement in an appropriate measurement gap and is synchronized with the cell in which the EUTRAN measurement is performed.

  The measurement of the physical layer includes that the radio characteristics are measured by the terminal device and the base station device and reported to the upper layer of the network.

RSRP is defined as a linear average value of the power of resource elements that transmit CRS within the carrier frequency and measurement bandwidth (measurement frequency bandwidth) set in the measurement object setting. Resource R ₀ to which CRS is mapped is used for RSRP determination. If the terminal device can accurately detect that R ₁ is available, R ₁ may be used in addition to R ₀ to determine RSRP. Note that R ₀ indicates a resource (resource element) of the CRS antenna port 0, and R ₁ indicates a resource (resource element) of the CRS antenna port 1. The power per resource element may be determined from the energy received during the useful portion of the symbol excluding the CP.

  Note that a resource and a radio resource may be synonymous with a resource element, may be synonymous with a resource block, or are a resource element and / or a resource block within a subframe / slot and a bandwidth. Also good.

  In the RSRP, if the upper layer indicates the measurement based on the DS, the terminal apparatus measures the RSRP in the subframe within the set DS occasion (within the subframe constituting the DS occasion). If the terminal apparatus can accurately detect the presence of CRS in other subframes (that is, subframes other than the DS occasion), the terminal apparatus can determine the RSRP in order to determine the RSRP. Resource elements may be used. That is, if RSRP measurement is instructed using CRS in DS, the terminal apparatus uses CRS resources mapped to subframes within DS (within DS occasion) and outside DS (outside DS occasion). RSRP may be measured.

  The reference point for RSRP is preferably the antenna connector of the terminal device. If receive diversity is used by the terminal equipment, the reported value will not be lower than the RSRP corresponding to any of the individual diversity branches. Further, the measurement bandwidth and the number of resource elements in the measurement period used for RSRP measurement may be determined by the terminal device as long as necessary measurement accuracy is satisfied. Further, the power for each resource element is determined from the energy received in the effective part of the symbol excluding the CP. The unit of RSRP is dBm or W.

  RSRQ is a power ratio of RSRP and RSSI in the number of resource blocks corresponding to the measurement bandwidth of RSSI. Note that the RSRP and RSSI measurement bandwidths are composed of the same set of resource blocks. Note that the RSSI used for calculating the RSRQ and the histogram or RSSI for which measurement is reported may be measured individually.

  The RSSI is obtained at a specific OFDM symbol in the measurement bandwidth and measurement subframe and includes the total received power that is linearly averaged. The measurement bandwidth is the number N of resource blocks by the terminal device from all sources. All sources may also include shared channel serving and non-serving cells, adjacent channel interference, thermal noise, and the like. That is, RSSI may be measured including interference power and noise power.

  The RSSI is measured from an OFDM symbol including a reference symbol for antenna port 0 of the measurement subframe unless instructed by an upper layer. If the higher layer indicates that RSRQ measurement is performed using all OFDM symbols, RSSI is measured from all OFDM symbols in the DL portion (downlink subframe and DwPTS) of the measurement subframe. If the higher layer indicates that RSRQ measurement is performed using a specific OFDM symbol, RSSI is measured from all OFDM symbols in the DL portion (downlink subframe and DwPTS) of the indicated subframe. That is, the OFDM symbol used for RSSI measurement is determined based on an instruction / setting from an upper layer.

  If the upper layer indicates a DS based measurement, RSSQ is measured from all OFDM symbols in the DL portion of the subframe within the configured DS occasion. The reference point for RSRQ is the antenna connector of the terminal device. If receive diversity is used by the terminal equipment, the reported value cannot be lower than the RSRQ corresponding to any of the individual diversity branches. The unit of RSRQ is dB.

When RSRP is performed using CSI-RS resources, it may be referred to as CSI-RSRP. Note that CSI-RSRP is defined as a linear average value of power of resource elements that transmit CSI-RS within a measurement bandwidth of a subframe within a set DS occasion. For the determination of CSI-RSRP, resource R ₁₅ (resource of antenna port 15) to which CSI-RS is mapped is used. That is, when measuring the CSI-RSRP, the terminal device measures the power in the resource to which R ₁₅ is mapped and performs linear averaging. Moreover, the reference point of CSI-RSRP is the antenna connector of a terminal device. If receive diversity is used by the terminal equipment, the reported value will not be lower than the CSI-RSRP corresponding to any of the individual diversity branches. The number of resource elements used in determining the CSI-RSRP within the measurement period and within the measurement bandwidth may be an implementation of the terminal device as long as the corresponding measurement accuracy is satisfied. That is, the terminal device may select and measure resource elements within the measurement period and the measurement bandwidth so as to satisfy the measurement accuracy.

  When outputting the measurement result in the physical layer (first layer) to the upper layer, the average and / or sub in the frequency direction (frequency resource in the measurement bandwidth (or one resource block) in one subframe / one slot) It may be filtered at the physical layer, such as a time average within a frame / slot (time resource within a measurement bandwidth within one subframe / slot). Filtering in the physical layer (first layer) is referred to as first layer filtering. For example, for filtering in the physical layer, an average of a plurality of input values, an average of weighting, an average following channel identification, or the like may be applied. Furthermore, the measurement result filtered in the physical layer may be further filtered in the upper layer (third layer, RRC layer). Filtering in the upper layer (third layer) is referred to as third layer filtering. In the third layer filtering, each measurement result input from the physical layer is calculated based on the filter coefficient. The filter coefficient is set as an upper layer parameter. The filter coefficient may be set corresponding to each of RSRP, RSRQ, and CSI-RSRP. The filter coefficient may be set as one of the parameters for setting the physical quantity. If higher layer parameters related to RSSI measurement are set in the terminal device, a filter coefficient related to RSSI may be set. Further, the filter coefficient related to RSSI may be set as one of the parameters for setting the physical quantity. Note that the filter coefficient may be referred to as a filtering coefficient.

  In the LAA cell, communication may be started after performing LBT (Listen Before Talk). LBT is energy such as interference power (interference signal, reception power, reception signal, noise power, noise signal) before the base station apparatus and / or terminal apparatus performs transmission (communication) at a frequency corresponding to the LAA cell. (Or signal) is detected, and the frequency of the energy (signal power value) exceeds a predetermined threshold value, and the frequency is idle (free (clear), not congested) State, not dedicated to other signals, no other signals present) or busy (not free, congested, dedicated to other signals, etc. Is determined (identified, detected). When it is determined that the frequency is in an idle state based on the LBT, the base station device or terminal device belonging to the LAA cell can transmit a signal at a predetermined timing. Also, if it is determined that the frequency is busy based on the LBT, the base station apparatus or terminal apparatus belonging to the LAA cell does not transmit a signal at a predetermined timing. The measurement related to LBT may be referred to as CCA (Clear Channel Assessment). That is, in the present invention, LBT and CCA may be synonymous.

  Next, an example of CCA is shown.

  The first CCA determines whether the channel (frequency or cell) is clear by comparing the detected energy value with a predetermined threshold in a certain measurement period (period in which LBT and / or CCA is performed). . The first CCA may be referred to as an ED (Energy Detection) type CCA.

  The second CCA determines whether or not the channel is clear based on whether or not a signal to which a predetermined modulation scheme or sequence generation method is applied is detected in a certain measurement period. The second CCA may be referred to as a CS (Carrier Sense) type CCA.

  The third CCA detects a signal to which a predetermined modulation scheme or sequence generation method (predetermined encoding modulation scheme) is applied in a certain measurement period, and the detected signal energy value is a predetermined threshold value. Whether or not the channel is clear is determined based on whether or not. The third CCA may be referred to as a hybrid CCA.

  If a terminal device and / or a base station device belonging to the LAA cell detects a signal related to LAA in a certain measurement period, it may determine that the channel is clear and transmit the signal.

  Separately from the first CCA to the third CCA described above, an ICCA (Initial CCA, LBT category 2, single sensing, frame-based equipment (FBE)) that performs a CCA check only once and a predetermined number of CCAs. There are ECCAs (Extended CCA, LBT category 3 or 4, multiple sensing, Load based equipment (LBE)) to check. ICCA and ECCA may be used in combination with any of the first CCA to the third CCA. ICCA and ECCA indicate a period during which CCA check is performed (that is, a measurement period), and first CCA to third CCA are criteria for determining whether or not a channel is clear (that is, threshold value, received power ( Energy) value). Each of the ICCA and ECCA may have a measurement period set / specified separately. ICCA is composed of one measurement period, and ECCA is composed of a plurality of measurement periods. One measurement period may be referred to as one measurement slot. For example, the length (size) of the ICCA measurement slot may be 34 microseconds. The length of the ECCA measurement slot may be 9 microseconds. Further, a period in which the CCA check is performed after the transition from the busy state to the idle state in the channel (frequency, cell) may be referred to as a defer period. The duration may be 34 microseconds. When the terminal device performs CCA (LBT), it may be set which CCA is used from the base station device through higher layer signaling. A period during which the CCA check is performed (CCA check period) may be referred to as an LAA collision window. The size of the collision window may be defined in ECCA slots. Also, the size of the collision window may be changed by backoff between the X and Y ECCA slots. The backoff value may be changed dynamically or semi-statically. That is, the back-off value may be set as one field in the DCI format or may be set as an upper layer parameter.

  The period during which the CCA check is performed may be referred to as an LAA collision window. The size of the collision window may be defined in ECCA slots. Also, the size of the collision window may be changed by backoff between the X and Y ECCA slots. The backoff value may be changed dynamically or semi-statically. That is, the back-off value may be set as one field in the DCI format or may be set as an upper layer parameter.

  Next, report settings and measurement reports according to the present embodiment will be described.

  The report setting is a setting indicating a predetermined condition for the measurement result to be reported, and the measurement report is measured to the base station apparatus when the measurement result satisfies the condition indicated in the corresponding report setting. Report the results. Note that the reported measurement result is the measurement result after the third layer filtering unless there is an instruction / setting from the upper layer.

  The report setting includes a report setting in EUTRA associated with the report setting identifier. The report setting identifier may be defined for each RAT. That is, a report setting identifier is associated with a report setting in EUTRA and a report setting in UTRA.

  The report setting includes an event ID, an event trigger condition corresponding to the event ID, a trigger physical quantity, hysteresis, a trigger time (TTT), a report quantity physical quantity, a maximum number of report cells, a report interval, a report count, and the like.

  The predetermined event ID and the predetermined event trigger condition are associated with each other. The event ID may be 1 and the event trigger condition may be associated as A1. These correspondences may be set by the base station apparatus and set in the terminal apparatus as higher layer parameters.

  A corresponding threshold value may be further set in the event trigger condition. The terminal device determines whether or not to report the measurement result by comparing the measurement result of the measurement object corresponding to the report setting with the threshold value included in the event trigger condition. Note that the event trigger condition may be simply referred to as an event, an event type, or a trigger type.

  The trigger physical quantity is used to define the type of measurement result used in the event trigger condition. For example, if RSRP is set as the trigger physical quantity, the threshold value is also regarded as the power value, and if RSRQ is set, the threshold value is also regarded as the power ratio. That is, the trigger physical quantity is used to determine whether the event trigger condition is satisfied based on which measurement result.

  The reported physical quantity is used to specify the type of measurement result to be reported when the event trigger condition is satisfied. The reported measurement result includes at least the measurement result set by the trigger physical quantity. In addition, reporting of different types of measurement results may be set by the reported physical quantity.

  The TTT indicates the period of time that certain criteria for the event must be met in order to trigger a measurement report.

  The maximum number of reported cells indicates the maximum number of cells, excluding the serving cell, included in the measurement report related to CRS. That is, the maximum number of reportable cells indicates the maximum number of measurement results corresponding to the cells. The maximum number of report cells may indicate the maximum number of CSI-RS resources of CSI-RS included in a measurement report related to CSI-RS.

  A threshold may be set for each of RSRP and RSRQ. Further, when RSSI measurement is instructed, a threshold related to RSSI may be set.

  The reporting interval defines an interval for performing periodic reporting and reporting based on events. Note that a measurement report that is periodically reported may be referred to as a trigger type periodic measurement report, and a measurement report based on an event may be referred to as a trigger type event measurement report.

  The number of reports defines the number of measurement reports applied not only to regular reports (trigger type regular) but also to reports based on events (trigger type events).

  In addition, the measurement result compared with a threshold value is a measurement result after performing 3rd layer filtering. However, when RSSI measurement results are compared (that is, in an event related to RSSI), the third layer filtering may not be applied.

  Two conditions (entering condition (entry condition) and leaving condition) are defined for the event. One (entering condition) is a condition for performing a measurement report when the condition is satisfied (starting the measurement reporting procedure), and the other (leaving condition) is a measurement for performing a measurement report when the condition is satisfied. This is a condition for deleting the measurement result from the result list.

  The event includes an event for a measurement report related to CRS, an event for a measurement report related to inter-RAT, and an event for a measurement report related to CSI-RS, and a parameter indicating a trigger condition such as a threshold is set for each event.

  When performing a measurement report related to RSSI, an event for the measurement report related to RSSI may be added to the event. When performing the measurement report regarding RSSI, the event including the event with respect to the measurement report regarding RSSI may be set. That is, the event for the measurement report regarding RSSI may be included in the report setting. At that time, the trigger physical quantity, the report physical quantity, the threshold, the maximum number of report cells, the report interval, the number of reports, TTT, and the like may be set as individual parameters (that is, parameters used only for measurement reports related to RSSI).

  Next, an event for a measurement report related to RSSI according to the present embodiment will be described. Note that RSSI includes a measured value of RSSI.

  FIG. 5 is a diagram showing an outline of report setting according to the present embodiment. The vertical axis indicates RSSI, and the horizontal axis indicates time. In addition, RSSI may be divided into levels based on measured power (reception power, RSSI value) as shown in the figure (for example, Lv.1 to Lv.4 in the figure). These levels are called power levels. These levels may be referred to as an RSSI level or an intensity level. If a predetermined number of measurement points are indicated by higher layers within a measurement period or reporting interval, RSSI is measured at each measurement point. When a predetermined condition is satisfied, the terminal device starts a measurement report procedure. When the predetermined condition is not satisfied, the measurement result corresponding to the measurement report may not be included in the measurement result list (measurement result to be reported to the base station apparatus). That is, when the predetermined condition is not satisfied, the terminal device does not have to report the measurement result to the base station device. Note that the measurement point may be referred to as a measurement bin. When the power level is managed by a table, an index or a value associated with the power level may be set.

  In FIG. 5, when the measurement period and / or the report interval are set as the report setting parameters, the measurement points in the measurement period are shown based on the RSSI measurement resources set in the measurement object corresponding to the report setting. May be. The measurement point may be indicated by a predetermined bit string. A bit indicating a measurement point may be set to “1”. At each measurement point, RSSI may be measured. At least one measurement resource is included for each measurement point. The measurement point may be composed of one or a plurality of subframes. At least one measurement resource may be included for each subframe within the measurement point. The RSSI measured within the measurement point may be time averaged (that is, the time domain RSSI average). The total number of measurement resources used for RSSI measurement at each measurement point is the length of the measurement point (for example, the time length (duration), the number of subframes in the time direction, and the symbol ( The number of slots) and the measurement bandwidth (for example, the number of resource blocks and the number of resource elements (subcarriers) in the frequency direction). That is, the frequency average of RSSI (that is, the average of RSSI in the frequency domain) may be performed at the measurement point. However, when a plurality of subsets (subbands) are set in the measurement bandwidth, the total number of measurement resources may be determined for each subband (within the subband). That is, when a subband is set, the terminal device may measure RSSI for each subband (for example, frequency average of RSSI may be performed for each subband).

  In FIG. 5, for ease of explanation, the measurement points are shown with an interval, but the measurement points may not be provided with an interval. That is, the measurement points may be indicated as a duration composed of continuous subframes (or symbols). At that time, the measurement resource may be set periodically. Further, the measurement resource may be a specific frequency resource of each symbol within the duration. That is, RSSI may be measured for all symbols.

  Note that the length (continuation period) of the time region of one measurement point may be set as the measurement period. In that case, RSSI may be measured in each of the measurement resources which differ in a time direction. In this case, the time average may not be performed using each measurement resource in one measurement point. However, frequency averaging may be performed for different measurement resources in the frequency domain mapped at the same time (symbol).

  Note that the time domain of the measurement point may be set based on the measurement subframe (subframe offset) and the period (which may be a subframe offset corresponding to the period). Further, the setting of the time domain of the measurement points may be performed based on a subframe pattern (a bit string having a predetermined length). Further, the setting of the time domain of the measurement point may be only the measurement period (measurement continuation period). The time length (slot length) of each measurement point may be the same as the slot length of the CCA, or may be the same as one OFDM symbol length. For example, if the measurement period is 120 ms (120 subframes) and the time length of the measurement points is the same as one OFDM symbol (NCP), the total number of measurement points in the time direction in the measurement period is 120 × 14 (that is, 1680). The terminal device may generate a histogram corresponding to each power level using the 1680 points when performing a measurement report regarding RSSI.

  In the first event, when the ratio of measurement points at which RSSI is measured at a predetermined power level (threshold) or higher in a predetermined measurement period occupies a predetermined ratio or higher, the terminal device performs a measurement report on RSSI. May be. Referring to FIG. 5, for example, during the measurement period, the measured RSSI is Lv. The terminal device may perform a measurement report on RSSI when the ratio of measurement points having a power level of 3 or more (second threshold or more) exceeds 50%. The measurement point may be the time measured at the measurement point.

  As a parameter relating to the first event, a predetermined measurement period or a predetermined number of measurement points, a predetermined power level serving as a threshold, and a predetermined ratio may be set.

  The second event is that if the RSSI of a predetermined power level (threshold) or more is measured a predetermined number of times (predetermined time) or more in a predetermined measurement period, the terminal device may perform a measurement report on RSSI. Good. When the predetermined measurement period indicates infinite (indefinite), the predetermined measurement period may not be set to the report setting.

  In the third event, when the number of measurement points at which RSSI of a predetermined power level (threshold) or higher is measured in a predetermined measurement period reaches a predetermined number or more, the terminal device reports a measurement report on RSSI. You may do it. When the predetermined measurement period indicates infinite (indefinite), the predetermined measurement period may not be set to the report setting.

  The fourth event compares the first measurement object (first frequency, first cell) and the second measurement object (second frequency, second cell) in the measurement period of the same length. When the number of measurement points at which RSSI of a predetermined power level (threshold) or more is measured is larger in the first measurement object (or second measurement object), the terminal device reports the measurement report related to RSSI. May be performed.

  In the fifth event, when a signal to which a predetermined coded modulation scheme (modulation scheme and sequence generation method) is applied is received, the terminal apparatus may perform a measurement report related to RSSI.

  In the sixth event, a ratio of receiving a signal to which a predetermined coded modulation scheme (modulation scheme and sequence generation method) is applied within a predetermined measurement period is equal to or higher than a predetermined ratio (for example, 50% or higher, or the number of detections). The terminal device may make a measurement report related to RSSI.

  In the seventh event, when a predetermined report interval or measurement period elapses, the terminal device may perform a measurement report related to RSSI. That is, the measurement period for RSSI may be included in the report setting. An RSSI histogram for the measurement period may be generated.

  In the above-described event, it is described that the power level is equal to or higher than a predetermined power level, but may be replaced with a power level lower than or equal to a predetermined power level. It may be included within a predetermined power level (that is, the same as the predetermined power level).

  When any condition of each event included in the report setting is satisfied, the terminal device reports a measurement result (that is, the terminal device starts a measurement reporting procedure).

  Note that an event for a measurement report related to RSSI may be referred to as an EUTRA measurement report event related to a CSI-IM resource (that is, CSI-RS of zero power). That is, when this event is set, the terminal device measures RSSI in the CSI-IM resource, and reports the result (measurement result indicated by the report setting) if the condition is satisfied.

  An event for a measurement report related to RSSI may also be referred to as an EUTRA measurement report event related to a resource (a subframe or symbol other than the DS occasion) for which a DS is not transmitted. That is, when this event is set, the terminal device measures RSSI in the resource to which DS is not transmitted, and reports the result (measurement result indicated by the report setting) if the condition is satisfied.

  Further, an event for a measurement report related to RSSI may be referred to as an EUTRA measurement report event related to resources (for example, guard time, guard period, measurement gap, etc.) that are not transmitted from the base station apparatus. In other words, when this event is set, the terminal apparatus measures RSSI in the resource indicated that there is no transmission from the base station apparatus, and if the condition is satisfied, the result (the measurement indicated by the report setting). Report).

  Further, an event for a measurement report related to RSSI may be referred to as an EUTRA measurement report event related to a resource for which PSS / SSS is not transmitted in PSS / SSS (6 RBs reserved for PSS / SSS). That is, when this event is set, the terminal device measures RSSI in a resource to which PSS / SSS is not transmitted, and reports the result (measurement result indicated by the report setting) if the condition is satisfied.

  Further, an event for a measurement report related to RSSI may be referred to as an EUTRA measurement report event related to a guard band (that is, a frequency resource (resource block) that is not used for transmission of the base station apparatus). The guard band is indicated by the difference between the system bandwidth and the measurement bandwidth / transmission bandwidth. For example, if the measurement bandwidth / transmission bandwidth is 18 MHz with respect to the system bandwidth of 20 MHz, 1 MHz at both ends (2 MHz in total) is used as the guard band.

  An event for a measurement report related to RSSI may also be referred to as an EUTRA measurement report event related to zero power CRS. For example, the measurement object configuration may indicate an antenna port used as a zero power CRS. The CRS (particularly, the resource of the antenna port 0) is transmitted in all subframes even if no PDCCH or PDSCH is transmitted from the base station apparatus unless a restriction is provided. Among them, if the resource of one antenna port is set as a resource of zero power, interference power, noise power, or RSSI can be measured in all subframes. Unless measurement is required in all subframes, RSSI measurement may be limited using a measurement subframe pattern, a measurement cycle (measurement period), or the like.

  An event for a measurement report related to RSSI may also be referred to as an EUTRA measurement report event related to zero power UERS. For example, the antenna port used as zero power UERS may be indicated in the measurement object configuration. Interference power, noise power, or RSSI may be measured at an antenna port used as zero power UERS. Also, by setting the period, subframe offset, and duration so as to overlap with the DMTC and / or DS occasion, the terminal device includes the transmission power from the base station device within the DMTC and / or DS occasion. No interference power and noise power (that is, RSSI including interference power and noise power) can be measured.

  An event for a measurement report related to RSSI may be referred to as an EUTRA measurement report event related to a zero power PRS (Positioning Reference Signal). For example, the measurement object setting may include a parameter used for frequency offset. Compared with CRS and CSI-RS, PRS has more resources included in one subframe (both frequency domain and time domain). By using a zero-power PRS resource, interference power and noise power (that is, RSSI including interference power and noise power) that does not include transmission power from the base station apparatus uniformly in each of the frequency domain and the time domain. ) Can be measured.

  An event for a measurement report related to RSSI may also be referred to as an EUTRA measurement report event related to a zero power OFDM symbol (or a specific OFDM symbol). Since the downlink signal is not transmitted from the connected base station apparatus in the zero power OFDM symbol, the terminal apparatus does not include the transmission power from the base station apparatus, that is, interference power and noise power (that is, interference power and noise). RSSI including power) can be measured. At the same time, interference power and noise power can be measured in the base station apparatus, and the hidden terminal can be grasped by collating with the measurement result from the terminal apparatus.

  Also, an event for a measurement report related to RSSI may be referred to as an EUTRA measurement report event related to a zero power subframe (or a specific subframe). Interference power and noise power can be measured by measuring RSSI in each OFDM symbol included in a subframe of zero power. At the same time, interference power and noise power can be measured in the base station apparatus, and the hidden terminal can be grasped by collating with the measurement result from the terminal apparatus. By measuring the RSSI to some extent for a long time, the possibility of missing a hidden terminal can be reduced.

  An event for a measurement report related to RSSI may be referred to as an EUTRA measurement report event related to a slot in which a terminal apparatus and a base station apparatus perform CCA check at the same time. Note that interference and noise measurement may be used instead of the CCA check. During the time when the base station apparatus performs the CCA check, the downlink signal is not transmitted from the base station apparatus to the cell (channel, frequency, component carrier). That is, the terminal device can measure the interference power and noise power not including the transmission power from the base station device by performing the CCA check at that time.

  An event for a measurement report related to RSSI may be referred to as an EUTRA measurement report event related to a measurement point for RSSI measurement. The setting of the time / frequency resource regarding the measurement point may be set based on the measurement object setting. By defining the measurement point for RSSI measurement, the base station apparatus can grasp the hidden terminal by excluding the measurement result of the measurement point even when the downlink signal is transmitted at the measurement point. be able to.

  By setting these resources as resources for measuring RSSI, a downlink signal is not transmitted from the base station apparatus connected to the terminal apparatus, so it is transmitted from an adjacent cell, another RAT, a WiFi node, or the like. Signal power (that is, interference power and noise power) can be measured. By reporting these measurement results to the connected base station apparatus, the base station apparatus can grasp the hidden terminal.

  That is, an event for a measurement report related to RSSI may be performed based on resources used for RSSI (interference and noise) measurement.

  Resources associated with the event may be set based on parameters included in the measurement object settings.

  Next, a measurement result that is reported when a condition for generating a measurement report in the event described above is satisfied will be described.

  The reported measurement result may be a parameter (for example, TRUE) indicating that the condition is satisfied.

  Further, the reported measurement result may be a ratio occupied by measurement points (or measurement times) corresponding to each power level in the measurement period. In other words, it is the number of times (number of measurement points) that RSSI included in each power level is measured in the measurement period. For example, referring to FIG. 5, the number of measurement points for each power level in the measurement period is 3, 3, 4, 2 in order from level 1. The terminal apparatus may report the number of measurement points for each power level (or the ratio of the number of measurement points corresponding to each power level) in the measurement report. Information indicating the number (ratio) of measurement points corresponding to each power level in a certain measurement period is referred to as a histogram. For example, if the ratio corresponding to each power level is expressed by 8 bits, the ratio corresponding to each power level is CEILING ((2 ^ 8-1) × number of measurement points corresponding to each power level. (Or the total time at which each power level is detected) / total number of measurement points in the measurement period (total measurement time, measurement duration)). As an example, if the total time for detecting the first power level (Lv.1) is 1 ms at a measurement time of 100 ms, the ratio corresponding to the first power level is 1/100 (or 1%). A value (or a bit string corresponding to the value) or a bit value is calculated. Similar calculations are made for each power level. The ratio corresponding to each power level may be calculated such that a value or bit value corresponding to 1 (or 100%) is calculated by adding the ratio corresponding to all power levels. However, there are cases where the ratio corresponding to all the power levels does not become 1 or 100% even if the ratios are added. The bit value is determined based on the total number of bits constituting the histogram. For example, in the case of 8 bits, 0 to 255 may be set, and a ratio (or%) may be associated with each value.

  Further, the reported measurement result may be the number of measurement points at each power level equal to or higher than the threshold value.

  The reported measurement result may be a bit string indicating a measurement point at which the power level is detected. Referring to FIG. 5, there are 12 measurement points within the measurement period. For example, when indicating a measurement point at which level 4 is detected, a bit string such as “001000000010000” may be set as the measurement result. A bit string corresponding to each power level may be included in the measurement result. In addition, the bit string may indicate a measurement point at which an RSSI value equal to or higher than a threshold value (predetermined RSSI value) or below (less than) is detected instead of the power level. For example, referring to FIG. 5, a bit string such as “111011011111” may be set as a measurement result when a measurement point equal to or greater than the first threshold is indicated.

  In addition, the ratio of each power level measured within the measurement period may be managed by a table and / or an index. For example, an index (for example, index 1) corresponding to a first ratio (for example, 3: 3: 4: 2) from level 1 to level 4 may be defined.

  These measurement results may be used by the base station apparatus to recognize hidden terminals around the terminal apparatus. That is, these measurement results may be used to detect a terminal that is not recognized by the base station apparatus. Note that a hidden terminal is a terminal that cannot be grasped by measurement of interference power / noise power by a base station apparatus, CCA check, and / or CSI report from the terminal apparatus. If the base station apparatus performs a schedule without grasping the hidden terminal, the signal transmitted from the hidden terminal becomes interference and noise to the terminal apparatus, which causes the communication efficiency to deteriorate. By collating the measurement result by the base station device with the measurement result by the terminal device, the base station device can grasp the hidden terminal. The hidden terminal may include an access point, a base station device, other terminal devices, and the like.

  Next, settings regarding RSSI included in the measurement object settings according to the present embodiment will be described.

  The measurement object is set to indicate the frequency, resource, and timing at which to make measurements for EUTRA.

  When the measurement object setting includes a setting related to RSSI, the terminal device may measure the RSSI using a resource indicated by the setting. The resource may be a resource indicating a measurement point.

  The setting related to RSSI may include setting of resources used for CSI-IM. That is, the setting regarding the RSSI may include setting regarding the zero power CSI-RS resource. A base station apparatus does not transmit a downlink signal (for example, CSI-RS) in the zero power CSI-RS resource used for the set CSI-IM. The terminal apparatus measures interference power / noise power or RSSI in the set CSI-IM resource. Parameters include frequency resource settings (frequency direction resource settings), subframe offsets and measurement periods, or subframe patterns used for measurement (time direction resource settings). These CSI-IM resources may be listed. A setting related to a CSI-IM resource and an ID related to RSSI measurement (for example, a CSI-IM setting ID) may be linked.

  If the configuration and / or list of CSI-IM resources used for RSSI measurements are included in the measurement DS configuration, the CSI-IM resources are mapped to some or all subframes within the DS occasion duration. May be.

  When a plurality of CSI-IM resources are mapped in one subframe, linear averaging may be performed using the RSSI value of each resource. In addition, when a plurality of CSI-IM resources are mapped in one subframe, the RSSI value of each resource may not be linearly averaged if the symbol to which the resource is mapped is different. Accordingly, the number of measurement points may be considered to increase.

  The setting related to RSSI may include a parameter (symbol pattern or subframe pattern) indicating a symbol and / or a subframe in which measurement related to RSSI is performed. Note that the parameter indicating the symbol and the parameter indicating the subframe may be set independently. Based on the two parameters, it may be indicated in which symbol of which subframe the RSSI measurement is performed. In the case of only a parameter indicating a symbol, RSSI measurement may be performed on the symbol in all subframes. In the case of only a parameter indicating a subframe, RSSI measurement may be performed on all symbols of the subframe. In addition, it is preferable that the measurement subframe pattern regarding RSSI is set separately from the measurement subframe pattern with respect to the adjacent cell contained in the same measurement object setting, and becomes a different pattern. That is, it is preferable that there is no overlapping subframe between the measurement subframe pattern related to RSSI and the measurement subframe pattern for the adjacent cell.

  In addition, when the setting related to RSSI is included in the measurement object setting of the same frequency as PCell, the measurement subframe pattern related to RSSI is set separately from the measurement subframe pattern for PCell and may be a different pattern. preferable. That is, it is preferable that there is no overlapping subframe between the measurement subframe pattern for RSSI and the measurement subframe pattern for PCell.

  Moreover, the measurement subframe pattern regarding RSSI may be matched with a measurement period. For example, if the measurement period is 40 ms (40 subframes), the measurement subframe pattern related to RSSI may be represented by 40 bits. If the measurement period is 80 ms (80 subframes), the measurement subframe pattern related to RSSI may be represented by 80 bits. That is, the number of bits (bit string length) used in the measurement subframe pattern may be determined according to the measurement period. In addition, the length of the measurement period may be determined according to the number of bits (length of the bit string) used in the measurement subframe pattern.

  In addition, when the measurement subframe pattern and the measurement period related to RSSI are individually set, the measurement period is preferably an integer multiple of the total number of subframes used in the measurement subframe pattern. For example, if the total number of subframes used in the measurement subframe pattern is 10 subframes (that is, if the measurement subframe pattern is expressed by a 10-bit bit string), the measurement period is 10 × n (n is An integer) is preferable. The same pattern is repeated within the measurement period.

  In addition, although the measurement sub-frame pattern regarding RSSI was mentioned as an example and demonstrated, the measurement symbol pattern may be set similarly.

  The setting related to RSSI may include setting of resources used for RSSI measurement. For the setting of the resource, a parameter indicating the measurement subframe (or measurement symbol) and the measurement period, and a parameter used for specifying a time / frequency resource (a parameter for specifying a resource element to which the resource is mapped) May be included.

  Further, the setting related to RSSI may include a parameter indicating whether or not to measure in a resource to which DS is not transmitted. When the terminal device indicates that the parameter is to be measured, the terminal device measures the RSSI with a resource (OFDM symbol or subframe) not transmitted by DS. When subframes or OFDM symbols to be measured are determined, parameters indicating them may be set as settings related to RSSI. Further, a subframe in which a DS is not mapped in the DS occasion may be regarded as a measurement subframe.

  In addition, when a setting related to RSSI is included in the measurement DS setting, the terminal apparatus may measure the RSSI using a resource to which the DS is not mapped in some or all of the subframes. For example, measurement resources and measurement points may be specific resources of all OFDM symbols in the DS occasion. When the DS occasion is composed of 6 subframes (NCP) and all OFDM symbols of all subframes are measurement points, the terminal apparatus measures RSSI at each of 6 × 14 = 84 points in total, and the RSSI A histogram corresponding to the level may be generated. The terminal device may classify the measurement results of RSSI at each point and generate a corresponding histogram.

  The setting related to RSSI may include a parameter indicating a zero-power CRS resource. For example, a parameter indicating a CRS resource not used in the own cell, a parameter indicating measuring resources other than the CRS used in the own cell, and the like may be included. The parameter indicating the resource may include a parameter indicating the offset in the frequency direction, a subframe pattern, and the like.

  The setting related to RSSI may include a parameter indicating a UERS resource of zero power. For example, a parameter indicating UERS resources not used in the own cell, a parameter indicating measuring resources other than UERS used in the own cell, and the like may be included. The parameter indicating the resource may include a parameter indicating the offset in the frequency direction, a subframe pattern, and the like.

  Further, the setting related to RSSI may include a parameter indicating a PRS resource of zero power. For example, a parameter indicating a PRS resource not used in the own cell, a parameter indicating measuring a resource other than the PRS used in the own cell, and the like may be included. The parameter indicating the resource may include a parameter indicating the offset in the frequency direction, a subframe pattern, and the like.

  Also, the setting related to RSSI may include a parameter indicating a zero power (or specific) OFDM symbol or subframe. For example, a parameter indicating a zero power OFDM symbol or a subframe may be included. The parameter may be indicated by a bit string like a subframe pattern.

  Moreover, the setting regarding RSSI may include a parameter indicating whether or not to measure the guard time / guard period. The setting regarding RSSI may include a parameter indicating a specific guard time / guard period. Several symbols (one or more symbols) at the boundary between DL transmission (DL burst) and UL transmission (UL burst) may be set as the guard time / guard period. Note that the terminal apparatus does not expect a downlink signal to be transmitted from the base station apparatus (cell) connected to the RRC in the guard time / guard period defined as the RSSI measurement parameter. That is, in the guard time / guard period, the measured RSSI is interference power or noise power from other nodes or other cells. In this guard time / guard period, the base station apparatus and the terminal apparatus may simultaneously measure RSSI, CCA, or power.

  Moreover, the setting regarding RSSI may include a parameter indicating whether or not to measure a guard band. For example, a parameter for limiting the measurement subframe may be included.

  From FIG. 5, the setting related to RSSI may be the setting of resources used for the measurement point. For example, parameters indicating frequency direction resources (eg, frequency offset, subcarrier offset, resource element offset, etc.) and time direction resources (eg, subframe offset and period, symbol offset, etc.) used at the measurement point are included. May be.

  When the carrier frequency included in the measurement object setting belongs to a predetermined frequency or a predetermined operating band, the terminal device may measure the RSSI to be reported for measurement (or to generate a histogram).

  A plurality of settings regarding RSSI may be set in one measurement object setting. That is, the settings regarding RSSI may be listed. The list of settings regarding RSSI may include IDs corresponding to the settings regarding each RSSI. That is, the setting and the ID may be in a correspondence relationship.

  Moreover, the setting regarding RSSI may be called the setting regarding a histogram. The settings related to RSSI may include not only parameters used for RSSI measurement but also parameters used to generate a histogram. Moreover, the setting regarding RSSI may include a parameter indicating a measurement point of RSSI as shown in FIG. That is, a frequency resource indicating a measurement point and a parameter for setting a measurement timing may be included.

  Moreover, the setting regarding RSSI may include a measurement period used for generating a histogram. This corresponds to the measurement period shown in FIG. Based on the measurement period and the measurement resource, the total number of measurement points may be determined.

  Note that the settings regarding RSSI may not be included in the measurement object settings. For example, when the carrier frequency included in the measurement object setting (frequency set by the carrier frequency) belongs to the operating band of LAA, the terminal apparatus measures RSSI using a predetermined measurement resource, and if necessary The measured RSSI may be classified into levels and a histogram may be generated. The base station apparatus determines whether the measurement result to be reported is a measurement result for RSRQ based on the report setting related to the measurement object setting according to the set carrier frequency, or a measurement result based on RSSI (for example, RSSI level). It may be possible to determine whether or not the histogram corresponds to.

  For example, the terminal apparatus may generate a histogram related to RSSI only when a periodic report is set in a report setting related to a measurement object setting including a setting related to RSSI. The histogram to report may not correspond to all levels. That is, only the histogram corresponding to a specific level may be reported. Which level of histogram to report may be determined based on parameters included in the reporting settings. Note that this periodic report may be newly set in order to perform measurement related to RSSI. That is, it may be set as a periodic report related to RSSI. For example, the purpose for periodic reporting may not be to report the strongest cell or CGI (Cell Global Identifier). Further, the purpose for the periodic report may be to report a histogram or report a measurement result related to RSSI.

  If the setting related to RSSI includes a measurement period for generating a histogram, the RSSI may be measured in each OFDM symbol in the measurement period, and the result may be divided into levels to generate a histogram for each level. .

  Assuming that the measurement setting includes a measurement period for generating a histogram, the RSSI for generating a histogram may be measured only in a measurement object including a predetermined carrier frequency. That is, whether to measure RSSI for generating a histogram may be determined based on the carrier frequency.

  Although described as a parameter for generating a histogram, it may be a parameter for generating a bit string of measurement points corresponding to a level.

  The terminal apparatus measures only the RSSI for the RSRQ depending on whether the measurement object setting includes a setting related to RSSI and whether or not the related report setting indicates to report the measurement result related to RSSI. Further, it may be determined whether to measure RSSI used to detect a hidden terminal such as a histogram. Further, the terminal device may determine whether to measure RSRQ for CSI-RSRP depending on whether or not the measurement DS setting is included in the measurement object setting.

  Next, a measurement procedure according to this embodiment will be described.

  For all measurements, the terminal device shall perform the measurement results prior to using the measurement results for evaluation of the reporting criteria (ie for events in the reporting setup) or for measurement reports. Apply third layer filtering. That is, the terminal device filters the measurement results for all measurements using the filter coefficient based on the physical quantity setting.

  When there is a measurement setting (that is, when a parameter included in the measurement setting is set), the terminal apparatus performs RSRP and / or RSRQ measurement for each serving cell.

  If the measurement subframe pattern with respect to PCell is set with respect to PCell, a terminal device may restrict | limit the subframe measured based on the measurement subframe pattern with respect to PCell. If this measurement subframe pattern is not set, the terminal apparatus performs RSRP and / or RSRQ measurement on the PCell in each subframe. Note that the measurement resource used for the RSRP and / or RSRQ measurement is CRS (resource for CRS).

  If the terminal device performs DS measurement based on the CRS, the measurement DS setting is set in the measurement object corresponding to the frequency of the SCell (that is, the SCell on which the measurement report is performed). Then, the DMTC related to the measurement DS setting is applied to each inactivated SCell. That is, based on DMTC, the terminal apparatus performs DS measurement based on CRS for each inactivated SCell at a frequency set in a measurement object including DMTC.

  If it is set to report CGI (Cell Global Indicator) for the purpose of the related report setting for each measurement ID included in the measurement ID list in the variable measurement setting, and the system for handover If the information request is set to the relevant report setting, the corresponding measurement is performed at the frequency and RAT indicated in the relevant measurement object using the required autonomous gap. Otherwise, a corresponding measurement is made at the frequency and RAT indicated in the associated measurement object, using the required autonomous gap or valid idle period.

  Note that the variable measurement settings include cumulative settings of measurements performed by the terminal device that cover measurements related to intra frequency, inter frequency, and inter RAT mobility.

  When the first condition or the second condition is satisfied, the terminal apparatus performs a corresponding measurement of the CSI-RS resource at the frequency indicated by the related measurement object. Note that DMTC based on the measurement DS setting of the related measurement object is applied to the CSI-RS resource.

  Further, when the first condition or the second condition is satisfied and the third condition is satisfied, the terminal apparatus performs a corresponding measurement of the adjacent cell at the frequency indicated by the related measurement object. The terminal apparatus performs measurement in the measurement subframe limited based on the measurement subframe pattern for the neighboring cell if the neighboring cell in the primary frequency is set by the related measurement object. Also, DMTC related to the measurement DS setting in the related measurement object may be applied.

  The first condition is when the measurement gap setting is set, the second condition is when the terminal device does not require a measurement gap for performing related measurements, and the third condition is , Where the relevant reporting settings include reporting measurement results for the measured CRS. The second condition further includes any one of conditions A to C. Condition A is when the PCell quality threshold (s-Measure) is not set. Condition B is when the PCell quality threshold is set and the RSell of the PCell after the third layer filtering is lower than this threshold. Condition C is set in the measurement object to which the measurement DS setting is related, the terminal device supports DS measurement based on CSI-RS, and the event ID of the related report setting is set to an event related to CSI-RS. Or reporting the maximum value of CSI-RS measurement results. Otherwise, the corresponding measurements of neighboring cells in the frequency and RAT indicated in the associated measurement object are made. If it is set as an associated measurement object for the adjacent cell of the primary frequency, the measurement is performed in the measurement subframe limited based on the measurement subframe pattern for the adjacent cell.

  In addition, if the terminal apparatus performs measurement related to RSSI, and the setting related to RSSI is set to a frequency corresponding to the frequency of the SCell in the measurement object, the terminal apparatus is activated and / or deactivated. For each SCell in the state, RSSI measurement is performed using a measurement resource related to the setting related to the RSSI. For example, the measurement resource may be determined based on the measurement subframe pattern and / or the measurement symbol pattern, or may be determined based on an associated setting included in the measurement object setting.

  Further, if the terminal apparatus performs measurement related to RSSI, and the frequency corresponding to the frequency of the SCell is set in the measurement object, and the frequency is a predetermined frequency (and a predetermined operating band) If it belongs, the RSSI measurement is performed for each SCell in the activated state and / or inactivated state using the associated measurement resource.

  If the measured RSSI result is not used for the RSRQ measurement result, the terminal device uses the RSSI measurement result to occupy the exclusive time (occupancy rate, for each RSSI level within the measurement period). A histogram indicating the ratio may be generated.

  Next, the measurement report procedure according to the present embodiment will be described.

  The measurement report is intended to transmit a measurement result from the terminal device to the network (base station device, EUTRAN).

  For the measurement ID for which the measurement report procedure is triggered, the terminal device sets the measurement result in the measurement report message.

  In the measurement report message, the measurement ID that triggered the measurement report is set.

  The measurement result of the PCell is set in the measurement report message.

  In the measurement report message, a list of measurement results of the serving frequency included for each SCell set in the measurement result for the SCell may be set.

  If the report setting associated with the measurement ID that triggered the measurement report includes an additional report of the measurement result for the neighbor, the measurement object ID referenced in the measurement ID list other than the frequency corresponding to the measurement ID that triggered the measurement report For each serving frequency for, a list of measurement results of the serving frequency included in the best measurement result of the neighboring cell is set. The list includes the physical cell ID and the physical quantity for the measurement result of the best serving cell based on RSRP at the relevant serving frequency.

  Assuming that there is at least one suitable neighbor cell to report, the terminal sets the measurement results for the neighbor cells including the neighbor cell with the best measurement result up to the maximum number of reportable cells. If the trigger type is set to event, the best neighbor cell may include a cell included in the list of triggered cells defined in the variable measurement report list for the measurement ID.

  It may include appropriate cells to which new measurement results are applied since the last periodic report or since the measurement was started or reset.

  If there is at least one appropriate CSI-RS resource to report, the terminal device may include the CSI-RS resource with the best measurement result up to the maximum number of reportable cells. Set the list. If the trigger type is set to event, the best CSI-RS resource includes the CSI-RS included in the list of triggered CSI-RS defined in the variable measurement report list for the measurement ID. It may contain resources.

  Appropriate CSI-RS resources may be included to which the new measurement results are applied since the last periodic report or since the measurement was started or reset.

  A measurement CSI-RSID may be included for each CSI-RS resource included in the list of measurement results regarding CSI-RS. Moreover, you may include the measurement result after the 3rd layer filtering relevant to the report setting with respect to measurement ID.

  The terminal apparatus includes the physical quantities indicated by the reported physical quantities in the related report configuration in the order of decreasing trigger physical quantities related to the CSI-RS (that is, assuming that the best CSI-RS is included first). The measurement result of CSI-RSRP may be set in the measurement report message.

  If reporting the measurement result of CRS is included in the related report configuration, and the cell indicated by the physical cell ID of this CSI-RS resource is not the serving cell, the terminal apparatus shall You may set the measurement result with respect to a neighbor cell containing the cell and physical cell ID which were shown by physical cell ID. Further, the terminal device may set the RSRP measurement result including the RSRP of the related cell in the measurement report message. That is, the measurement result is reported as a set with the cell ID of the related cell.

  If reporting the measurement result related to RSSI is included in the related report setting (that is, if the parameter indicating reporting the measurement result related to RSSI is set in the report setting), the terminal device The measurement result regarding the RSSI of the cell indicated by the physical cell ID and the related physical cell ID may be set in the measurement report message.

  Reporting the measurement result related to RSSI is included in the related report setting (that is, if the parameter indicating that the measurement result related to RSSI is reported is set in the report setting), and CSI− If the RSSI is measured based on the IM resource, the terminal device sets the measurement result regarding RSSI including the resource indicated by the related CSI-IM setting ID and the CSI-IM setting ID in the measurement report message. May be. That is, the measurement result may be reported as a set with the setting ID of the related CSI-IM resource.

  If reporting related measurement results based on RSSI is included in the related reporting settings (i.e., parameters indicating reporting measurement results for histograms based on RSSI are set in the reporting settings). For example, the terminal device may set, in the measurement report message, the ID associated with the setting related to the RSSI and the measurement result related to the histogram based on the RSSI.

  The communicable range (communication area) of each frequency controlled by the base station apparatus is regarded as a cell. At this time, the communication area covered by the base station apparatus may have a different width and a different shape for each frequency. Moreover, the area to cover may differ for every frequency. A wireless network in which cells having different types of base station apparatuses and different cell radii are mixed in areas of the same frequency and / or different frequencies to form one communication system is referred to as a heterogeneous network. .

  The terminal device is not connected to any network, such as immediately after the power is turned on (for example, at startup). Such a disconnected state is referred to as an idle mode (RRC idle). The terminal device in the idle mode needs to be connected to one of the networks in order to perform communication. That is, the terminal device needs to be in a connection mode (RRC connection). Here, the network may include a base station device, an access point, a network server, a modem, and the like belonging to the network.

  Therefore, the terminal device in the idle mode needs to perform PLMN (Public Land Mobile Network) selection, cell selection / reselection, location registration, CSG (Closed Subscriber Group) cell manual selection, and the like in order to perform communication.

  When the terminal device is powered on, the PLMN is selected by the non-access layer (NAS). The associated radio access technology (RAT) is set for the selected PLMN. The NAS provides a list of corresponding PLMNs that the access layer (AS) uses for cell selection / reselection, if available.

  In the cell selection, the terminal device searches for an appropriate cell of the selected PLMN and selects a cell (serving cell) in which an available service is provided. Further, the terminal device adjusts the frequency to the control channel. Such a selection is referred to as “camp to cell”.

  If necessary, the terminal device uses the NAS registration procedure to detect the presence (selected cell) in the tracking area of the selected cell as a result of location registration success in which the selected PLMN becomes the registered PLMN. And information on tracking areas).

  When the terminal apparatus finds a more appropriate cell, it reselects the cell and camps according to the cell reselection criteria. If the new cell does not belong to at least one tracking area registered in the terminal device, location registration for the new cell is performed.

  If necessary, the terminal device searches for a PLMN having a higher priority at regular time intervals, and searches for an appropriate cell if another PLMN is selected by the NAS.

  The search for available CSG may be triggered by the NAS to support manual CSG selection.

  If the terminal device is out of the coverage range of the registered PLMN, either the new PLMN is automatically selected (automatic mode) or the PLMN is manually selected (manual mode). This may be set by the user. However, when receiving a service that does not require registration, the terminal device may not perform such registration.

  There are the following (A1) to (A5) for the purpose of camping the cell by the terminal device in the idle mode.

  (A1) The terminal device can receive system information from the PLMN (or EUTRAN).

  (A2) When registered, if the terminal device attempts to establish an RRC connection, it initially accesses the network using the control channel of the camped cell.

  (A3) If a call to a terminal device registered by the PLMN is received, the PLMN knows a set of tracking areas (that is, camp cells) in which the terminal device is camped. The PLMN can then send a “paging message” to the terminal equipment on the control channel of all cells in this set of tracking areas. Then, since the terminal device adjusts the frequency to the control channel of one cell in the registered tracking area, it can receive the paging message and respond to the control channel.

  (A4) The terminal device can receive an ETWS (Earthquake and Tsunami Warning System) and CMAS (Commercial Mobile Alter System) notification.

  (A5) The terminal device can receive MBMS (Multimedia Broadcast-Multicast Service).

  If the terminal device could not find a suitable cell to camp on, or if location registration failed, it would try to camp on the cell and enter the “restricted service” state regardless of the PLMN identifier. . The service restricted here is an emergency call, ETWS, CMAS, etc. in a cell that satisfies the conditions. In contrast, normal service is provided for public use in the appropriate cell. There are also operator-specific services.

  When the NAS indicates that PSM (Power Saving Mode) starts, the access layer (AS) settings are maintained and all running timers continue to run, but the terminal device is idle mode tasks (eg, There is no need to perform PLMN selection or cell selection / reselection. When the terminal device is PSM and a certain timer expires, it is up to the implementation of the terminal device whether the last processing when PSM ends or the corresponding processing is performed immediately. When the NAS instructs the end of the PSM, the terminal device performs all idle mode tasks.

  The terminal device operates by regarding the inside of the cell as a communication area. When a terminal device moves from one cell to another cell, when not connected (RRC idle, idle mode, not communicating), cell selection / reselection procedure, connected (RRC connection, connected mode, communicating) Moves to another appropriate cell by the handover procedure. An appropriate cell is a cell that is generally determined that access by a terminal device is not prohibited based on information specified by a base station device, and the downlink reception quality satisfies a predetermined condition. Indicates the cell to be used.

  In the PLMN selection, the terminal device reports a PLMN that can be used to the NAS or a request from the NAS or voluntarily. During PLMN selection, a specific PLMN may be selected either automatically or manually based on a list of PLMN identifiers in priority order. Each PLMN in the list of PLMN identifiers is identified by a 'PLMN identifier'. In the system information on the broadcast channel, the terminal device can receive one or a plurality of 'PLMN identifiers' in a certain cell. The result of the PLMN selection made by the NAS is the identifier of the selected PLMN.

  Based on the NAS request, the AS searches for available PLMNs and reports them to the NAS.

  In the case of EUTRA, the terminal device scans all RF channels in the EUTRA operating band according to the function information of the terminal device in order to find an available PLMN. In each carrier (component carrier), the terminal device searches for the strongest cell and reads the system information to find the PLMN to which the cell belongs. If the terminal device can read one or several PLMN identifiers in its strongest cell, each discovered PLMN is reported to the NAS as a higher quality PLMN. Note that a higher quality PLMN criterion is that the RSRP value measured for the EUTRA cell is greater than or equal to a predetermined value (eg, −110 dBm). Note that the strongest cell is, for example, a cell having the best (highest) measured value such as RSRP or RSRQ. That is, the strongest cell is a cell optimal for communication in the terminal device.

  If the discovered PLMN does not meet the criteria but can be read, the PLMN identifier along with the RSRP value is reported to the NAS. Measurements reported to the NAS are the same for each PLMN discovered in one cell.

  PLMN search may be stopped by NAS request. The terminal device may optimize the PLMN search by using the held information (for example, information on the carrier frequency and cell parameter from the reception measurement control information element).

  As soon as the terminal device selects the PLMN, a cell selection procedure is performed to select an appropriate cell of the PLMN for camping.

  If the CSG-ID is provided by the NAS as part of the PLMN selection, the terminal device searches for an acceptable cell or an appropriate cell belonging to the provided CSG-ID to camp. When the terminal device cannot camp on the cell of the provided CSG-ID, the AS provides the information to the NAS.

  In the cell selection / reselection, the terminal apparatus performs measurement for the cell selection / reselection.

  The NAS may control the RAT in which cell selection has been performed, for example, by indicating a RAT associated with the selected PLMN, or by maintaining a list of prohibited registration areas and a corresponding PLMN list. it can. The terminal device selects an appropriate cell based on the idle mode measurement and the cell selection criteria.

  In order to accelerate the cell selection process, information held for several RATs may be used at the terminal equipment.

  When camping on a cell, the terminal device searches for a better cell according to cell reselection criteria. If a better cell is found, that cell is selected. A cell change may mean a RAT change. Here, a better cell is a cell that is more suitable for communication. For example, a better cell is a cell with better communication quality (for example, a good measurement value of RSRP or RSRQ when compared between cells).

  If the cell selection / reselection is changed in the system information regarding the received NAS, the NAS is provided with the information.

  In normal service, the terminal device camps on an appropriate cell and adjusts the wavelength to the control channel of that cell. By doing so, the terminal device can receive system information from the PLMN. Further, the terminal device can receive registration area information such as tracking area information from the PLMN. Further, the terminal device can receive other AS and NAS information. If registered, paging and notification messages can be received from the PLMN. In addition, the terminal device can start transition to the connection mode.

  The terminal device uses one of two cell selection procedures. Initial cell selection does not require prior knowledge (retention information) that the RF channel is an EUTRA carrier. The terminal device scans all RF channels in the EUTRA operating band according to the terminal device capability information to find a suitable cell. At each carrier frequency, the terminal device only needs to search for the strongest cell. As soon as a suitable cell is found, this cell is selected.

  Retained information cell selection requires retained carrier frequency information and optionally further information on cell parameters from previously received measurement control information elements or from previously detected cells. As soon as the terminal device finds a suitable cell, it selects that cell. If no suitable cell is found, an initial cell selection procedure is initiated.

  In addition to standard cell selection, manual selection of CSG is supported by the terminal device in response to a request from an upper layer.

  Clear priorities for different EUTRAN frequencies or inter-RAT frequencies are provided to the terminal equipment in the system information (eg RRC connection release message) or by taking over from the other RAT in the (re) selection of the inter-RAT cell It may be. For system information, EUTRAN frequencies or inter-RAT frequencies are listed without providing priorities.

  If the priority is provided by dedicated signaling, the terminal device ignores all the priority provided by the system information. If the terminal device is camped in any cell, the terminal device only applies the priority provided by the system information from the current cell (currently connected cell). Unless otherwise specified, the terminal device holds the priority provided by dedicated signaling or the RRC connection deletion message.

  The terminal device in idle mode can acquire the cell ID of the cell by synchronizing the time and frequency of the cell and decoding the PSS / SSS from the PSS / SSS. The frequency position of CRS can be estimated from the cell ID, and RSRP / RSRQ measurement can be performed.

  Note that EUTRAN measurement includes measurement performed by a terminal device in connection mode. The terminal device performs EUTRAN measurement in an appropriate measurement gap and is synchronized with the cell in which the EUTRAN measurement is performed. EUTRAN measurement includes intra-frequency RSRP / RSRQ, inter-frequency RSRP / RSRQ, reception / transmission time difference of terminal device, reference signal time difference (RSTD) used for positioning of terminal device, inter-RAT (EUTRAN-GERAN / UTRAN) measurement, system Between (EUTRAN-non-3GPP RAT) measurements. EUTRAN measurements are defined as physical layer measurements. EUTRAN measurements are used to support mobility.

  The terminal device in the idle mode and the connected mode acquires a time and frequency synchronization with the cell by performing a cell search, and detects the PCI of the cell. EUTRA cell search supports an expandable transmission bandwidth corresponding to 6 resource blocks or more.

  In order to perform cell search, PSS / SSS is transmitted in the downlink. That is, the terminal apparatus performs cell search using PSS / SSS. The terminal apparatus assumes that the antenna ports 0 to 3 and the PSS / SSS of the serving cell are QCL (Quasi Co-Location) with respect to Doppler shift and average delay.

  The neighbor cell search is based on the same downlink signal as the initial cell search.

  The RSRP measurement is performed based on CRS or CSI-RS of a set DS (Discovery Signal).

  When a terminal device that is in a normal camping state has an individual priority other than the current frequency, the terminal device is a frequency with a lower priority than the current frequency (that is, lower than the eight network settings). ).

  While the terminal device is camping on the appropriate CSG cell, the terminal device will always make the current frequency the highest priority frequency, regardless of any other priority value assigned to the current frequency (i.e. Higher than 8 network settings).

  When the terminal device enters the RRC connected state, or when the timer (T320) for any validity time of the dedicated priority expires, or when the PLMN selection is performed in response to a request by the NAS, the terminal device Delete the priority provided by dedicated signaling.

  The terminal device only performs cell reselection estimation on the EUTRAN frequency or inter-RAT frequency having the priority given by the system information and provided by the terminal device.

  The terminal apparatus does not consider a blacklisted cell as a candidate for cell reselection.

  The terminal device takes over the priorities and duration of validity provided by dedicated signaling.

  If the terminal device supports manual CSG selection, in response to a NAS request, the AS scans all RF channels in the EUTRA operating band according to its capability information to find an available CSG. . In each carrier, the terminal device searches for at least the strongest cell, reads its system information, and the CSG-ID that can be used by the NAS together with the PLMN and the “HNB (Home Node B) name” (if reported) To report.

  If the NAS selects a CSG and provides this selection to the AS, the terminal device searches for a cell that satisfies the conditions belonging to the selected CSG or appropriate cell for camping.

  In addition to standard cell reselection, the terminal device may be a CSG member cell that has been visited (and has been accessed) at least before when at least one CSG-ID associated with the PLMN identifier is included in the CSG whitelist of the terminal device. In order to detect this, an autonomous search function in the non-serving frequency and the inter-RAT frequency may be used according to the characteristic requirement. In order to search for a cell, the terminal device may further use an autonomous search function at the serving frequency. If the CSG white list of the terminal device is empty, the terminal device disables the autonomous search function for the CSG cell. Here, the autonomous search function for each implementation of the terminal apparatus determines the time and place for searching for CSG member cells.

  If a terminal device detects one or more appropriate CSG cells at different frequencies, the terminal device is currently camping if its associated CSG cell is the highest ranking cell at that frequency. Regardless of the cell frequency priority, one of the detected cells is reselected.

  When the terminal device detects an appropriate CSG cell at the same frequency, the terminal device reselects the cell based on the standard cell reselection rule.

  When the terminal device detects one or more CSG cells in another RAT, the terminal device reselects one of them based on a specific rule.

  The terminal device applies standard cell reselection while camping on the appropriate CSG cell.

  In order to search for an appropriate CSG cell in a non-serving frequency, the terminal device may use an autonomous search function. When a terminal device detects a CSG cell at a non-serving frequency, the terminal device may reselect the detected CSG cell if it is the highest ranking cell at that frequency.

  If a terminal device detects one or more CSG cells in another RAT, the terminal device may reselect one of them if it is allowed based on certain rules.

  In addition to the standard cell reselection rule, the terminal device uses an autonomous search function to detect at least a previously visited hybrid cell whose PLMN identifier associated with the CSG-ID is in the CSG white list according to the characteristic requirement. If the PLMN identifier associated with the CSG-ID of the hybrid cell is in the CSG whitelist, the terminal device treats the detected hybrid cell as a CSG cell, and treats the rest as a standard cell.

  When in the normal camping state, the terminal device performs the following tasks (B1) to (B4).

  (B1) The terminal device selects and monitors the paging channel indicated by the cell in accordance with the information transmitted in the system information.

  (B2) The terminal device monitors related system information.

  (B3) The terminal apparatus performs necessary measurements for the cell reselection estimation procedure.

  (B4) The terminal device executes the cell reselection estimation procedure when the information on the BCCH (Broadcast Control Channel) used for the trigger and / or the cell reselection estimation procedure inside the terminal device is changed.

  When transitioning from the connected mode to the idle mode, if the information about the redirected carrier (redirectedCarrierInfo) is included in the RRC connection release message, the terminal device attempts to camp on an appropriate cell according to the information. If the terminal device cannot find a suitable cell, it is allowed to camp on any suitable cell of the indicated RAT. If the RRC connection release message does not include information on the redirected carrier, the terminal device attempts to select an appropriate cell in the EUTRA carrier. If an appropriate cell is not found, the terminal device starts cell selection using a retained information cell selection procedure in order to find an appropriate cell to camp on.

  If the terminal device is re-adjusted to the idle mode after shifting from the state of camping on any cell to the connected mode, the terminal device assumes that the information about the redirected carrier is included in the RRC connection release message Try to camp on an acceptable cell according to information about the redirected carrier. If the RRC connection release message does not include information on the redirected carrier, the terminal device attempts to select an acceptable cell in the EUTRA carrier. If no acceptable cell is found, the terminal device continues to search for an acceptable cell of any PLMN in any cell selection state. In any cell selection state, a terminal device that is not camping on any cell continues this state until it finds an acceptable cell.

  If it is in the state where it is camping on any cell, the terminal device performs the following tasks (C1) to (C6).

  (C1) The terminal device selects and monitors the paging channel indicated by the cell in accordance with the information transmitted in the system information.

  (C2) The terminal device monitors related system information.

  (C3) The terminal apparatus performs necessary measurements for the cell reselection estimation procedure.

  (C4) The terminal device executes the cell reselection estimation procedure when information on a trigger and / or BCCH (Broadcast Control Channel) used for the cell reselection estimation procedure in the terminal device is changed.

  (C5) The terminal device periodically tries all frequencies of all RATs supported by the terminal device to find an appropriate cell. If an appropriate cell is found, the terminal device shifts to a normally camping state.

  (C6) If the terminal device supports voice service and the current cell does not support the emergency call indicated in the system information, and if no suitable cell is found, the terminal device Regardless of the priorities provided in the system information from, the cell selection / reselection is performed on the permissible cells of the supported RAT.

  The terminal device permits the EUTRAN cell in the frequency not to be reselected in order to prevent camping to a cell where an IMS (IP Multimedia Subsystem) emergency call cannot be started.

  The terminal device performs the PLMN selection and cell selection, and then camps on the cell, so that a system such as MIB or SIB1 is used regardless of the state of the terminal device (RRC idle (idle mode), RRC connection (connection mode)). Information and paging information can be received. By performing random access, an RRC connection request can be transmitted.

  In the random access procedure in the terminal device in the idle mode, the upper layer (L2 / L3) instructs random access preamble transmission. The physical layer (L1) transmits a random access preamble based on the instruction. If L1 is ACK, that is, a random access response is received from the base station apparatus. If L2 / L3 receives the instruction from L1, L2 / L3 instructs L1 to transmit the RRC connection request. The terminal device transmits an RRC connection request (PUSCH corresponding to the UL-SCH to which the RRC message related to the RRC connection request is mapped) to the base station device (camping cell, EUTRAN, PLMN). The base station apparatus, when receiving it, transmits RRC connection setup (PDCCH and PDSCH related to DL-SCH to which an RRC message related to RRC connection setup is mapped) to the terminal apparatus. When the terminal device receives the RRC connection setup at L2 / L3, the terminal device enters the connection mode. When the terminal device L2 / L3 instructs L1 to transmit RRC connection setup completion, the procedure ends. L1 transmits RRC connection setup completion (PUSCH corresponding to UL-SCH to which an RRC message related to RRC connection setup completion is mapped) to the base station apparatus.

  The terminal device in the idle mode may receive a paging message using DRX (Discontinuous Reception) in order to reduce power consumption. Here, PO (Paging Occasion) is a subframe having a P-RNTI in which a PDCCH addressing a paging message is transmitted. A PF (Paging Frame) is a radio frame including one or more POs. When DRX is used, the terminal device needs to monitor one PO every DRX cycle. PO and PF are determined using DRX parameters provided in the system information. When the value of the DRX parameter is changed in the system information, the DRX parameter held in the terminal device is locally updated. If the terminal device does not have an IMSI (International Mobile Subscriber Identity), when making an emergency call without a USIM (Universal Subscriber Identity Module), the terminal device uses the default identifier (UE_ID = 0) and i_s in the PF. That is, PCH (paging information) is notified using PDCCH in a predetermined subframe of a predetermined radio frame.

  The terminal device camping on the cell acquires time-frequency synchronization from PSS / SSS and acquires PCI. Then, the terminal apparatus detects the MIB from the PBCH, and acquires the carrier frequency, the downlink transmission bandwidth, the SFN, the PHICH setting, and the like. The terminal device can monitor the PDCCH mapped to the entire downlink transmission bandwidth by acquiring the MIB. When the received PDCCH is accompanied by a CRC scrambled by SI-RNTI, the terminal apparatus acquires an SI message such as SIB1 from the PDSCH corresponding to the PDCCH. By acquiring these SI messages, information on physical channel / physical signal settings, information on cell selection, and the like can be acquired. Further, when the received PDCCH is accompanied by a CRC scrambled with P-RNTI, the terminal device can detect the PCH from the PDSCH corresponding to the PDCCH and acquire paging information. When the terminal device transitions from the idle mode to the connection mode, the terminal device performs initial access using a random access procedure. By performing the initial access, the base station apparatus can acquire information on the terminal apparatus. When the initial access is completed, the terminal device and the base station device can establish RRC connection. If the RRC connection is established, the terminal device transitions to the connection mode. In addition, when the terminal apparatus can monitor the PDCCH, the terminal apparatus periodically checks whether the terminal apparatus is in synchronization or out of synchronization using the PDCCH. When it is determined that the synchronization is lost, the terminal device notifies the upper layer of the fact. The upper layer receives the notification and determines that an RLF (Radio Link Failure) has occurred for the cell.

  The terminal device and the base station device aggregate (aggregate) frequencies (component carriers or frequency bands) of a plurality of different frequency bands (frequency bands) by carrier aggregation so that they become one frequency (frequency band). Techniques to handle may be applied. The component carrier includes an uplink component carrier corresponding to the uplink (uplink cell) and a downlink component carrier corresponding to the downlink (downlink cell). In each embodiment of the present invention, frequency and frequency band may be used synonymously.

  For example, when five component carriers having a frequency bandwidth of 20 MHz are aggregated by carrier aggregation, a terminal device capable of carrier aggregation regards these as a frequency bandwidth of 100 MHz and performs transmission / reception. Note that the component carriers to be aggregated may be continuous frequencies, or may be frequencies at which all or part of them are discontinuous. For example, when the usable frequency band is 800 MHz band, 2 GHz band, and 3.5 GHz band, one component carrier is transmitted in the 800 MHz band, another component carrier is transmitted in the 2 GHz band, and another component carrier is transmitted in the 3.5 GHz band. It may be.

  It is also possible to aggregate a plurality of continuous or discontinuous component carriers in the same frequency band. The frequency bandwidth of each component carrier may be a frequency bandwidth (for example, 5 MHz or 10 MHz) narrower than the receivable frequency bandwidth (for example, 20 MHz) of the terminal device, and the aggregated frequency bandwidth may be different from each other. . The frequency bandwidth is preferably equal to one of the frequency bandwidths of the conventional cell in consideration of backward compatibility, but may be a frequency bandwidth different from that of the conventional cell.

  In addition, component carriers (carrier types) that are not backward compatible may be aggregated. Note that the number of uplink component carriers assigned (set or added) to the terminal device by the base station device is preferably equal to or less than the number of downlink component carriers.

  A cell composed of an uplink component carrier in which an uplink control channel is set for a radio resource request and a downlink component carrier that is cell-specifically connected to the uplink component carrier is referred to as a PCell. Moreover, the cell comprised from component carriers other than PCell is called SCell. The terminal device performs reception of a paging message, detection of update of broadcast information, initial access procedure, setting of security information, and the like in the PCell, but does not have to be performed in the SCell.

  PCell is not subject to activation and deactivation control (that is, it is considered to be always activated), but SCell has a state of activation and deactivation, These state changes are explicitly specified by the base station apparatus, and the state is changed based on a timer set in the terminal apparatus for each component carrier. PCell and SCell are collectively referred to as a serving cell.

  Note that carrier aggregation is communication performed by a plurality of cells using a plurality of component carriers (frequency bands), and is also referred to as cell aggregation. The terminal device may be wirelessly connected (RRC connection) to the base station device via a relay station device (or repeater) for each frequency. That is, the base station apparatus of this embodiment may be replaced with a relay station apparatus.

  The base station apparatus manages a cell, which is an area in which the terminal apparatus can communicate with the base station apparatus, for each frequency. One base station apparatus may manage a plurality of cells. The cells are classified into a plurality of types according to the size (cell size) of the area communicable with the terminal device. For example, the cell is classified into a macro cell and a small cell. Further, small cells are classified into femtocells, picocells, and nanocells according to the size of the area. In addition, when the terminal device can communicate with a certain base station device, the cell set to be used for communication with the terminal device among the cells of the base station device is a serving cell, and for other communication Cells that are not used are called peripheral cells.

  In other words, in the carrier aggregation, the set serving cells include one PCell and one or more SCells.

  The PCell is a serving cell in which an initial connection establishment procedure (RRC Connection establishment procedure) has been performed, a serving cell that has started a connection reestablishment procedure (RRC Connection reestablishment procedure), or a cell designated as PCell in a handover procedure. PCell operates at the primary frequency. The SCell may be set when the connection is (re-) established or afterwards. The SCell operates at a secondary frequency. The connection may be referred to as an RRC connection. A terminal device supporting CA may be aggregated by one PCell and one or more SCells.

  If more than one serving cell is configured or a secondary cell group is configured, the terminal apparatus may code transport block codes for at least a predetermined number of transport blocks for each serving cell. In response to block decoding failure, the received soft channel bits corresponding to at least a predetermined range are retained.

  The LAA terminal may support functions corresponding to two or more radio access technologies (RAT).

  LAA terminals support more than one operating band. That is, the LAA terminal supports a function related to carrier aggregation.

  Further, the LAA terminal may support TDD (Time Division Duplex) and HD-FDD (Half Duplex Frequency Division Duplex). The LAA terminal may support FD-FDD (Full Duplex FDD). The LAA terminal may indicate which duplex mode / frame structure type is supported via higher layer signaling such as functional information.

  The LAA terminal may be a category X (X is a predetermined value) LTE terminal. In other words, the maximum number of bits of a transport block that can be transmitted / received in one TTI (Transmission Time Interval) may be expanded in the LAA terminal. In LTE, 1 TTI corresponds to 1 subframe.

  In each embodiment of the present invention, TTI and subframe may be synonymous.

  Also, the LAA terminal may support multiple duplex mode / frame structure types.

  Frame structure type 1 is applicable to both FD-FDD and HD-FDD. In FDD, 10 subframes can be used for each of downlink transmission and uplink transmission at intervals of 10 ms. Also, uplink transmission and downlink transmission are divided in the frequency domain. In the HD-FDD operation, the terminal device cannot transmit and receive at the same time, but there is no restriction in the FD-FDD operation.

  The retuning time (the time required for tuning (the number of subframes or the number of symbols)) when frequency hopping or the used frequency is changed may be set by higher layer signaling.

  For example, in the LAA terminal, the number of supported downlink transmission modes (PDSCH transmission modes) may be reduced. That is, when the number of downlink transmission modes or the downlink transmission mode supported by the LAA terminal is indicated as function information from the LAA terminal, the base station apparatus, based on the function information, Sets the downlink transmission mode. Note that, when a parameter for a downlink transmission mode that is not supported by the LAA terminal is set, the LAA terminal may ignore the setting. That is, the LAA terminal does not have to perform processing for the downlink transmission mode that is not supported. Here, the downlink transmission mode is used to indicate a PDSCH transmission scheme corresponding to PDCCH / EPDCCH based on the set downlink transmission mode, RNTI type, DCI format, and search space. Based on these pieces of information, the terminal device can know whether PDSCH is transmitted at antenna port 0, transmitted at transmission diversity, or transmitted at a plurality of antenna ports. The terminal device can appropriately perform reception processing based on the information. Even if DCI related to PDSCH resource allocation is detected from the same type of DCI format, if the downlink transmission mode or RNTI type is different, the PDSCH is not always transmitted in the same transmission scheme.

  When the terminal device supports a function related to simultaneous transmission of PUCCH and PUSCH, and supports a function related to repeated transmission of PUSCH and / or PUCCH, the timing at which PUSCH transmission occurs Alternatively, PUCCH and PUSCH may be repeatedly transmitted a predetermined number of times at the timing when PUCCH transmission occurs. That is, PUCCH and PUSCH are transmitted simultaneously at the same timing (that is, the same subframe).

  In such a case, the PUCCH may include a CSI report, HARQ-ACK, and SR.

  In PCell, all signals can be transmitted and received, but in SCell, there may be signals that cannot be transmitted and received. For example, PUCCH is transmitted only by PCell. Moreover, PRACH is transmitted only by PCell unless several TAG (Timing Advance Group) is set between cells. Moreover, PBCH is transmitted only by PCell. Moreover, MIB (Master Information Block) is transmitted only by PCell. However, when the terminal device supports the function of transmitting PUCCH or MIB by SCell, the base station device transmits PUCCH or MIB to the terminal device by SCell (frequency corresponding to SCell). You may instruct it to do. That is, when the terminal device supports the function, the base station device may set a parameter for transmitting PUCCH or MIB by SCell to the terminal device.

  In PCell, RLF (Radio Link Failure) is detected. The SCell does not recognize that RLF has been detected even if the conditions for detecting RLF are met. When the RLF condition is satisfied in the lower layer of the PCell, the lower layer of the PCell notifies the upper layer of the PCell that the RLF condition is satisfied. The PCell may perform SPS (Semi-Persistent Scheduling) or DRX (Discontinuous Transmission). In SCell, you may perform DRX same as PCell. In the SCell, information / parameters related to MAC settings are basically shared with PCells in the same cell group. Some parameters (for example, sTAG-Id) may be set for each SCell. Some timers and counters may be applied only to the PCell. Only applicable timers and counters may be set for the SCell.

  FIG. 3 is a schematic diagram illustrating an example of a block configuration of the base station apparatus 2 according to the present embodiment. The base station apparatus 2 includes an upper layer (upper layer control information notification unit) 501, a control unit (base station control unit) 502, a codeword generation unit 503, a downlink subframe generation unit 504, and an OFDM signal transmission unit (downlink transmission). Unit) 506, transmission antenna (base station transmission antenna) 507, reception antenna (base station reception antenna) 508, SC-FDMA signal reception unit (channel state measurement unit and / or CSI reception unit) 509, uplink subframe processing unit 510. The downlink subframe generation unit 504 includes a downlink reference signal generation unit 505. Further, the uplink subframe processing unit 510 includes an uplink control information extraction unit (CSI acquisition unit / HARQ-ACK acquisition unit / SR acquisition unit) 511. Note that the SC-FDMA signal reception unit 509 also serves as a reception signal, CCA, and interference noise power measurement unit.

  FIG. 4 is a schematic diagram illustrating an example of a block configuration of the terminal device 1 according to the present embodiment. The terminal device 1 includes a reception antenna (terminal reception antenna) 601, an OFDM signal reception unit (downlink reception unit) 602, a downlink subframe processing unit 603, a transport block extraction unit (data extraction unit) 605, a control unit (terminal) Control unit) 606, upper layer (upper layer control information acquisition unit) 607, channel state measurement unit (CSI generation unit) 608, uplink subframe generation unit 609, SC-FDMA signal transmission unit (UCI transmission unit) 611 and 612 And transmission antennas (terminal transmission antennas) 613 and 614. The downlink subframe processing unit 603 includes a downlink reference signal extraction unit 604. Also, the uplink subframe generation unit 609 includes an uplink control information generation unit (UCI generation unit) 610. Note that the OFDM signal receiving unit 602 also serves as a reception signal, CCA, and interference noise power measurement unit. That is, RRM measurement may be performed in the OFDM signal receiving unit 602.

  In each of FIG. 3 and FIG. 4, the upper layer may include a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, a PDCP (Packet Data Convergence Protocol) layer, and an RRC (Radio Resource Control) layer.

  The RLC layer includes AM (Acknowledged Mode) data including an indication indicating that transmission of TM (Transparent Mode) data, UM (Unacknowledged Mode) data transmission, and PDU (Packet Data Unit) transmission to the upper layer is successful. Perform transmission. Also, the transmission opportunity is notified to the lower layer together with the data transmission and the total size of the RLC PDU transmitted in the transmission opportunity.

  The RLC layer is a function related to transmission of higher layer PDUs (only for AM data transmission), a function related to error correction via ARQ (Automatic Repeat reQuest), and (only for UM and AM data transmission) RLC SDU (Service Functions related to combining / dividing / reconstructing (Data Unit), functions related to re-dividing RLC data PDUs (for AM data transmission), functions related to rearrangement of RLC data PDUs (only for AM data transmission), (UM Functions for duplicate detection only (for UM and AM data transmission), functions for discarding RLC SDU (only for UM and AM data transmission), functions for re-establishing RLC, protocol error (only for AM data transmission) Supports detection-related functions.

  First, the flow of downlink data transmission / reception will be described using FIG. 3 and FIG. In the base station apparatus 2, the control unit 502 includes MCS (Modulation and Coding Scheme) indicating a downlink modulation scheme and coding rate, downlink resource allocation indicating an RB used for data transmission, and information used for HARQ control ( Redundancy version, HARQ process number, and new data index) are stored, and the codeword generation unit 503 and the downlink subframe generation unit 504 are controlled based on these. Downlink data (also referred to as a downlink transport block, DL-SCH data, or DL-SCH transport block) sent from the upper layer 501 is controlled by the control unit 502 in the codeword generation unit 503. Processing such as error correction coding and rate matching processing is performed to generate a code word. A maximum of two codewords are transmitted simultaneously in one subframe in one cell. The downlink subframe generation unit 504 generates a downlink subframe according to an instruction from the control unit 502. First, the codeword generated by the codeword generation unit 503 is converted into a modulation symbol sequence by a modulation process such as PSK (Phase Shift Keying) modulation or QAM (Quadrature Amplitude Modulation) modulation. Also, the modulation symbol sequence is mapped to REs in some RBs, and a downlink subframe for each antenna port is generated by precoding processing. At this time, the transmission data sequence transmitted from the upper layer 501 includes upper layer control information which is control information (for example, dedicated (individual) RRC (Radio Resource Control) signaling) in the upper layer. Also, the downlink reference signal generation section 505 generates a downlink reference signal. The downlink subframe generation unit 504 maps the downlink reference signal to the RE in the downlink subframe according to an instruction from the control unit 502. The downlink subframe generated by the downlink subframe generation unit 504 is modulated into an OFDM signal by the OFDM signal transmission unit 506 and transmitted via the transmission antenna 507. Here, a configuration having one OFDM signal transmission unit 506 and one transmission antenna 507 is illustrated here, but when transmitting a downlink subframe using a plurality of antenna ports, transmission is performed with the OFDM signal transmission unit 506. A configuration including a plurality of antennas 507 may be employed. Further, the downlink subframe generation unit 504 can also have a capability of generating a physical layer downlink control channel such as PDCCH or EPDCCH and mapping it to the RE in the downlink subframe. Each of the plurality of base station apparatuses transmits an individual downlink subframe.

  In the terminal device 1, the OFDM signal is received by the OFDM signal receiving unit 602 via the receiving antenna 601, and subjected to OFDM demodulation processing.

  The downlink subframe processing unit 603 first detects a physical layer downlink control channel such as PDCCH or EPDCCH. More specifically, the downlink subframe processing unit 603 decodes PDCCH and EPDCCH as transmitted in an area where PDCCH and EPDCCH can be allocated, and confirms a CRC (Cyclic Redundancy Check) bit added in advance. (Blind decoding) That is, the downlink subframe processing unit 603 monitors PDCCH and EPDCCH. One CRC bit is assigned to one terminal such as an ID (C-RNTI (Cell-Radio Network Temporary Identifier), SPS-C-RNTI (Semi-Persistent Scheduling-C-RNTI)) assigned from the base station apparatus in advance. The downlink subframe processing unit 603 recognizes that the PDCCH or EPDCCH has been detected, and the control information included in the detected PDCCH or EPDCCH is the same as the terminal unique identifier (UEID) or Temporary C-RNTI) To extract PDSCH.

  The control unit 606 holds MCS indicating the modulation scheme and coding rate in the downlink based on the control information, downlink resource allocation indicating the RB used for downlink data transmission, and information used for HARQ control, based on these And controls the downlink subframe processing unit 603, the transport block extraction unit 605, and the like. More specifically, the control unit 606 performs control so as to perform RE demapping processing and demodulation processing corresponding to the RE mapping processing and modulation processing in the downlink subframe generation unit 504. The PDSCH extracted from the received downlink subframe is sent to the transport block extraction unit 605. Also, the downlink reference signal extraction unit 604 in the downlink subframe processing unit 603 extracts DLRS from the downlink subframe.

  The transport block extraction unit 605 performs rate matching processing in the codeword generation unit 503, rate matching processing corresponding to error correction coding, error correction decoding, and the like, extracts transport blocks, and sends them to the upper layer 607. It is done. The transport block includes upper layer control information, and the upper layer 607 informs the control unit 606 of necessary physical layer parameters based on the upper layer control information. Note that the plurality of base station apparatuses 2 transmit individual downlink subframes, and the terminal apparatus 1 receives these, so that the above processing is performed on the downlink subframes for each of the plurality of base station apparatuses 2. On the other hand, each may be performed. At this time, the terminal device 1 may or may not recognize that a plurality of downlink subframes are transmitted from the plurality of base station devices 2. When not recognizing, the terminal device 1 may simply recognize that a plurality of downlink subframes are transmitted in a plurality of cells. Further, the transport block extraction unit 605 determines whether or not the transport block has been correctly detected, and the determination result is sent to the control unit 606.

  Here, the transport block extraction unit 605 may include a buffer unit (soft buffer unit). In the buffer unit, the extracted transport block information can be temporarily stored. For example, when the transport block extraction unit 605 receives the same transport block (retransmitted transport block), if the decoding of the data for this transport block is not successful, the transport block extraction unit 605 temporarily stores it in the buffer unit. The stored data for the transport block and the newly received data are combined (synthesized), and an attempt is made to decode the combined data. The buffer unit flushes the data when the temporarily stored data is no longer needed or when a predetermined condition is satisfied. The condition of data to be flushed differs depending on the type of transport block corresponding to the data. A buffer unit may be prepared for each type of data. For example, a message 3 buffer or a HARQ buffer may be prepared as the buffer unit, or may be prepared for each layer such as L1 / L2 / L3. Note that flushing information / data includes flushing a buffer storing information and data.

  Next, the flow of uplink signal transmission / reception will be described. In the terminal apparatus 1, the downlink reference signal extracted by the downlink reference signal extraction unit 604 is sent to the channel state measurement unit 608 under the instruction of the control unit 606, and the channel state measurement unit 608 performs channel state and / or interference. And CSI is calculated based on the measured channel conditions and / or interference. Also, the control unit 606 sends the HARQ-ACK (DTX (untransmitted), ACK (successful detection), or NACK (not transmitted) to the uplink control information generating unit 610 based on the determination result of whether or not the transport block has been correctly detected. Detection failure)) and mapping to downlink subframes. The terminal device 1 performs these processes on the downlink subframes for each of a plurality of cells. In uplink control information generation section 610, PUCCH including the calculated CSI and / or HARQ-ACK is generated. In the uplink subframe generation unit 609, the PUSCH including the uplink data sent from the higher layer 607 and the PUCCH generated in the uplink control information generation unit 610 are mapped to the RB in the uplink subframe, and the uplink A subframe is generated.

  The SC-FDMA signal is received by the SC-FDMA signal receiving unit 509 via the receiving antenna 508, and SC-FDMA demodulation processing is performed. Uplink subframe processing section 510 extracts an RB to which PUCCH is mapped in accordance with an instruction from control section 502, and uplink control information extraction section 511 extracts CSI included in PUCCH. The extracted CSI is sent to the control unit 502. CSI is used for control of downlink transmission parameters (MCS, downlink resource allocation, HARQ, etc.) by the control unit 502.

From the power headroom report, the base station apparatus assumes the maximum output power P _CMAX set by the terminal apparatus, and assumes an upper limit value of power for each physical uplink channel based on the physical uplink channel received from the terminal apparatus. To do. Based on these assumptions, the base station apparatus determines the value of the transmission power control command for the physical uplink channel, and transmits it to the terminal apparatus using the PDCCH with the downlink control information format. By doing so, the power adjustment of the transmission power of the physical uplink channel transmitted from the terminal apparatus is performed.

  When transmitting a PDCCH (EPDCCH) / PDSCH to a terminal device, the base station apparatus performs PDCCH / PDSCH resource allocation so that it is not allocated to PBCH resources.

  The PDSCH may be used to transmit messages / information related to SIB / RAR / paging / unicast for the terminal device.

  Frequency hopping for PUSCH may be individually set according to the type of grant. For example, the parameter values used for PUSCH frequency hopping corresponding to each of the dynamic schedule grant, semi-persistent grant, and RAR grant may be set individually. Those parameters may not be indicated in the uplink grant. These parameters may also be set via higher layer signaling including system information.

  The various parameters described above may be set for each physical channel. Moreover, the various parameters described above may be set for each terminal device. Further, the parameters described above may be set in common between terminal devices. Here, the various parameters described above may be set using system information. The various parameters described above may be set using higher layer signaling (RRC signaling, MAC CE). The various parameters described above may be set using PDCCH / EPDCCH. The various parameters described above may be set as broadcast information. The various parameters described above may be set as unicast information.

In the above-described embodiment, the power value required for each PUSCH transmission includes parameters set by higher layers, adjustment values determined by the number of PRBs assigned to the PUSCH transmission by resource assignment, downlink path loss, and In the above description, the calculation is based on a coefficient to be multiplied, an adjustment value determined by a parameter indicating an offset of MCS applied to UCI, a value based on a TPC command, and the like. The power value required for each PUCCH transmission is used for parameters set by higher layers, downlink path loss, adjustment values determined by UCI transmitted on the PUCCH, adjustment values determined by PUCCH format, and transmission of the PUCCH. In the above description, it is calculated based on an adjustment value determined by the number of antenna ports to be obtained, a value based on a TPC command, and the like. However, the present invention is not limited to this. An upper limit is set for the required power value, and the minimum value between the value based on the above parameter and the upper limit value (for example, P _{CMAX, c} which is the maximum output power value in the serving cell _c ) is set to the required power. It can also be used as a value.

  The program that operates in the base station apparatus and terminal apparatus related to the present invention is a program that controls a CPU (Central Processing Unit) and the like (a program that causes a computer to function) so as to realize the functions of the above-described embodiments related to the present invention. There may be. Information handled by these devices is temporarily stored in RAM (Random Access Memory) during the processing, and then stored in various ROMs such as Flash ROM (Read Only Memory) and HDD (Hard Disk Drive). Reading, correction, and writing are performed by the CPU as necessary.

  In addition, you may make it implement | achieve a part of terminal device and / or base station apparatus in embodiment mentioned above with a computer. In that case, the program for realizing the control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by the computer system and executed.

  The “computer system” is a computer system built in a terminal device or a base station device, and includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system.

  Further, the “computer-readable recording medium” is a medium that dynamically holds a program for a short time, such as a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system that serves as a server or a client may also include a program that holds a program for a certain period of time. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  Further, the base station apparatus in the above-described embodiment can also be realized as an aggregate (apparatus group) composed of a plurality of apparatuses. Each of the devices constituting the device group may include some or all of the functions or functional blocks of the base station device according to the above-described embodiment. As a device group, it is only necessary to have each function or each functional block of the base station device. Further, the terminal apparatus according to the above-described embodiment can communicate with the base station apparatus as an aggregate.

  Further, the base station apparatus in the above-described embodiment may be an EUTRAN (Evolved Universal Terrestrial Radio Access Network). Moreover, the base station apparatus 2 in the above-described embodiment may have a part or all of the functions of the upper node for the eNodeB.

  In addition, a part or all of the terminal device and the base station device in the above-described embodiment may be realized as an LSI that is typically an integrated circuit, or may be realized as a chip set. Each functional block of the terminal device and the base station device may be individually chipped, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used.

  In the above-described embodiment, a cellular mobile station device (a mobile phone or a mobile terminal) is described as an example of a terminal device or a communication device. However, the present invention is not limited to this and is installed indoors and outdoors. On-board installation of stationary or non-movable electronic devices such as AV equipment, kitchen equipment (for example, refrigerators and microwave ovens), cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, car navigation systems, etc. The present invention can also be applied to a terminal device or a communication device such as a machine or other daily equipment.

  From the above, the present invention has the following features.

  (1) A terminal apparatus according to an aspect of the present invention is a terminal apparatus that communicates with a base station apparatus, and receives a measurement object setting including at least a setting related to a received signal strength indicator (RSSI) by using a higher layer signal. And a report setting related to the measurement object setting indicate that at least RSRQ (Reference Signal Received Quality) is to be reported, based on the corresponding first measurement subframe pattern, CRS ( A reception unit configured to measure a first RSSI from an OFDM (Orthogonal Frequency Division Multiplexing) symbol including a reference symbol of an antenna port 0 of a cell specific reference signal and calculate an RSRQ using the first RSSI; Unit based on the second measurement subframe pattern included in the setting related to the RSSI. Then, a subframe and a measurement period for measuring the second RSSI are specified, the second RSSI is measured in each of the subframes for measuring the second RSSI, and the second RSSI included in the measurement period is measured. A histogram is generated using the second RSSI measured in each of the subframes for measuring the RSSI.

  (2) A terminal apparatus according to an aspect of the present invention is the terminal apparatus described above, wherein the setting related to RSSI includes a setting related to at least one CSI-IM (Channel State Information-Interference Measurement) resource.

  (3) A terminal device according to an aspect of the present invention is the terminal device described above, wherein when the measurement object setting includes a first setting and a second setting related to the CSI-IM resource, the first device And the second setting are listed, and corresponding ID (Identity) is included for each of the first setting and the second setting, and the receiving unit includes the first setting and the second setting. In each of the resource based on the second resource and the resource based on the second setting, the second RSSI is measured, and based on the condition, the measurement result for the resource based on the first setting and the resource based on the second setting Report either or both of the measurement results for with a corresponding ID.

  (4) A base station apparatus according to an aspect of the present invention is a base station apparatus that communicates with a terminal apparatus, sets a setting related to RSSI for a measurement object setting, and a first report related to the measurement object setting A parameter indicating that a measurement result of RSRQ (Reference Signal Received Quality) is reported to the setting is set, and a measurement result related to a received signal strength indicator (RSSI) is set to the second report setting related to the measurement object setting. A parameter indicating that the data is to be reported, and using a higher layer signal, a transmitting unit to transmit, a measurement result corresponding to the first report setting, and a measurement result corresponding to the second report setting are received And a receiving unit.

  (5) A method according to an aspect of the present invention is a method in a terminal apparatus that communicates with a base station apparatus, and uses a higher layer signal to perform measurement object settings including at least settings relating to a received signal strength indicator (RSSI). If the receiving step and the report setting related to the measurement object setting indicate that at least RSRQ (Reference Signal Received Quality) is reported, the CRS (based on the corresponding first measurement subframe pattern is used. A step of measuring a first RSSI from an OFDM (Orthogonal Frequency Division Multiplexing) symbol including a reference symbol of antenna port 0 of a cell specific reference signal, a step of calculating an RSRQ using the first RSSI, and the RSSI The second measurement subframe pattern included in the settings for A step of specifying a subframe and a measurement period for measuring the second RSSI based on the measurement period, a step of measuring the second RSSI in each of the subframes for measuring the second RSSI, and the measurement period Generating a histogram using the second RSSI measured in each of the sub-frames for measuring the second RSSI included in.

  (6) A method according to an aspect of the present invention is a method in a base station apparatus that communicates with a terminal apparatus, the step of setting a setting related to RSSI for a measurement object setting, and a first related to the measurement object setting. A step of setting a parameter indicating that a measurement result of RSRQ (Reference Signal Received Quality) is to be reported with respect to the report setting, and a RSSI (Received Signal Strength Indicator) with respect to the second report setting related to the measurement object setting. ) To set a parameter indicating that a measurement result is to be reported and to transmit using a higher layer signal, a measurement result corresponding to the first report setting, and a measurement corresponding to the second report setting Receiving the result.

  (7) A terminal apparatus according to an aspect of the present invention is a terminal apparatus that communicates with a base station apparatus, and the carrier frequency included in the measurement object setting belongs to a predetermined operating band, and the report setting. , If it is shown that at least RSRQ (Reference Signal Received Quality) is reported as a measurement result and the periodic report is set, the first RSSI (Received Signal Strength Indicator) and the second RSSI are measured. The first RSSI is measured from all OFDM (Orthogonal Frequency Division Multiplexing) symbols of the indicated subframe, and the second RSSI is a subframe other than the indicated subframe. And the first RSSI defines an RSRQ for CRS. And the second RSSI is used to generate a histogram of RSSI.

  (8) A terminal apparatus according to an aspect of the present invention is the terminal apparatus described above, and when the measurement object setting includes a measurement DS (Discovery Signal) setting, the second RSSI includes the measurement DS setting. Measured from OFDM symbols of subframes other than the subframes constituting the DS occasion based on the.

  (9) A terminal apparatus according to an aspect of the present invention is the terminal apparatus described above, wherein the histogram includes a dedicated time (ratio of time domain) for each level of RSSI measured within a measurement period based on the report interval. Indicates.

  (10) A terminal apparatus according to an aspect of the present invention is the terminal apparatus described above, wherein the second RSSI is measured in each OFDM symbol.

  (11) A terminal device according to an aspect of the present invention is the above-described terminal device, and the resource used for the second RSSI measurement is used for PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal). Of the 6 resource blocks at the center of the bandwidth, these are resources that are not used for transmission.

  (12) A terminal apparatus according to an aspect of the present invention is the terminal apparatus described above, and a resource used for measurement of the second RSSI is a resource included in a guard band.

  (13) A base station apparatus according to an aspect of the present invention is a base station apparatus that communicates with a terminal apparatus, and includes a measurement object setting including a carrier frequency set to belong to a predetermined operating band, and an RSRQ (Reference Signal Received). If the predetermined operating band is the first operating band, the RSRQ measurement result is received if the higher-level signal is used to transmit a report setting indicating that the measurement result of Quality is reported. A receiving unit that receives a histogram corresponding to each level of RSSI (Received Signal Strength Indicator) if the predetermined operating band is the second operating band.

  (14) A method according to an aspect of the present invention is a method in a terminal apparatus that communicates with a base station apparatus, and if a carrier frequency included in a measurement object setting belongs to a predetermined operating band, and reports In the setting, if it is shown that at least RSRQ (Reference Signal Received Quality) is reported as a measurement result and the periodic report is set, the first RSSI (Received Signal Strength Indicator) and the second RSSI are set. Measuring, wherein the first RSSI is measured from all OFDM symbols of the indicated subframe and used to define an RSRQ for CRS, and the second RSSI is the indication of the indication Measured from OFDM symbols of sub-frames other than the sub-frame, and the RSSI histogram Used to generate a gram.

  (15) A method according to an aspect of the present invention is a method in a base station apparatus that communicates with a terminal apparatus, and includes a measurement object setting including a carrier frequency set to belong to a predetermined operating band, and an RSRQ (Reference Signal Received). Transmitting a report setting indicating that the measurement result of Quality) is to be reported using an upper layer signal, and receiving the measurement result for RSRQ if the predetermined operating band is the first operating band. And, if the predetermined operating band is the second operating band, receiving a histogram corresponding to each level of RSSI (Received Signal Strength Indicator).

  (16) A terminal apparatus according to an aspect of the present invention is a terminal apparatus that communicates with a base station apparatus, and the measurement object setting includes a first setting related to a histogram of RSSI (Received Signal Strength Indicator), Based on a first setting, the receiver comprises a resource that measures RSSI and a total number of resources that are used to generate a histogram, wherein the receiver determines the level of RSSI in each resource based on the measured value. Divide and generate histograms at each level.

  (17) A terminal apparatus according to an aspect of the present invention is the terminal apparatus described above, wherein the resources are based on resource settings and subframe settings related to CSI-IM (Channel State Information-Interference Measurement).

  (18) A terminal device according to an aspect of the present invention is the terminal device described above, wherein the resource is an OFDM (Orthogonal Frequency Division Multiplexing) symbol in which a DS is not transmitted in a DS (Discovery Signal) occasion.

  (19) A terminal device according to an aspect of the present invention is the terminal device described above, wherein the resource is a resource element of a guard band included in a specific subframe.

  (20) A terminal device according to an aspect of the present invention is the terminal device described above, wherein the resource is a resource allocated to a PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal), and the PSS / SSS is The resource is not sent.

  (21) A base station apparatus according to an aspect of the present invention is a base station apparatus that communicates with a terminal apparatus, and performs measurement object settings including a first setting related to a histogram of RSSI (Received Signal Strength Indicator) on an upper layer. A transmission unit that transmits using a signal is provided, and the first setting includes at least a measurement period.

  (22) A base station apparatus according to an aspect of the present invention is the above base station apparatus, wherein the transmission unit uses a higher layer signal for a report setting including a parameter for instructing to report the histogram. And send.

  (23) A method according to an aspect of the present invention is a method in a terminal device that communicates with a base station device, and the measurement object setting includes a first setting related to a histogram of RSSI (Received Signal Strength Indicator), Based on the first setting, a step of determining a resource for measuring RSSI and a total number of resources used for generating a histogram, and the receiving unit divides the RSSI in each resource based on the measurement value. And generating a histogram at each level.

  (24) A method according to an aspect of the present invention is a method in a base station device that communicates with a terminal device, and includes a measurement object setting including a first setting related to a histogram of RSSI (Received Signal Strength Indicator). Transmitting using a signal, and including at least a measurement period in the first setting.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention. The present invention can be modified in various ways within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention. It is. Moreover, it is the element described in each said embodiment, and the structure which substituted the element which has the same effect is also contained.

501 Upper layer 502 Control unit 503 Codeword generation unit 504 Downlink subframe generation unit 505 Downlink reference signal generation unit 506 OFDM signal transmission unit 507 Transmission antenna 508 Reception antenna 509 SC-FDMA signal reception unit 510 Uplink subframe processing unit 511 Uplink control information extraction unit 601 Reception antenna 602 OFDM signal reception unit 603 Downlink subframe processing unit 604 Downlink reference signal extraction unit 605 Transport block extraction unit 606 Control unit 607 Upper layer 608 Channel state measurement unit 609 Uplink sub Frame generator 610 Uplink control information generators 611 and 612 SC-FDMA signal transmitters 613 and 614 Transmit antenna

Claims (9)

A terminal device that communicates with a base station device,
If the measurement object settings include the first setting for the histogram of RSSI (Received Signal Strength Indicator),
A receiving unit for determining a total number of resources used for generating a histogram and a resource for measuring RSSI based on the first setting;
The receiving unit divides a level of RSSI in each resource based on a measurement value, and generates a histogram at each level. The terminal device according to claim 1, wherein the resource is based on resource settings and subframe settings related to CSI-IM (Channel State Information-Interference Measurement). The terminal device according to claim 1, wherein the resource is an OFDM (Orthogonal Frequency Division Multiplexing) symbol in which DS is not transmitted in a DS (Discovery Signal) occasion. The terminal device according to claim 1, wherein the resource is a resource element of a guard band included in a specific subframe. The terminal device according to claim 1, wherein the resource is a resource to which the PSS / SSS is not transmitted among resources allocated to PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal). A base station device that communicates with a terminal device,
A transmission unit that transmits a measurement object setting including a first setting related to a histogram of RSSI (Received Signal Strength Indicator) using an upper layer signal,
The base station apparatus includes at least a measurement period in the first setting. The base station apparatus according to claim 6, wherein the transmission unit transmits a report setting including a parameter for instructing to report the histogram, using an upper layer signal. A method in a terminal apparatus that communicates with a base station apparatus,
If the measurement object settings include the first setting for the histogram of RSSI (Received Signal Strength Indicator),
Determining a resource for measuring RSSI and a total number of resources used to generate a histogram based on the first setting;
The receiving unit has a step of leveling RSSI in each resource based on a measured value, and generating a histogram at each level. A method in a base station apparatus communicating with a terminal apparatus,
Transmitting a measurement object setting including a first setting relating to a histogram of RSSI (Received Signal Strength Indicator) using an upper layer signal;
And including at least a measurement period in the first setting.

Images