WO2016121536A1 - Terminal device and method - Google Patents

Abstract

In order to perform efficient communications, a terminal device is provided that communicates with a base station device and comprises a buffer unit that temporarily buffers information relating to PDCCH settings, if a first function is supported and information relating to said PDCCH settings is included in an MIB, said PDCCH settings being for the terminal device having the first function. If the buffer unit generates an overflow as a result of receiving an SIB, the buffer unit prioritises holding information relating to PDCCH settings and flushes the overflow SIB.

Description

Terminal apparatus and method

Embodiments of the present invention relate to a technology of a terminal device, a base station device, and a method for realizing efficient sharing of channel state information.

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

Also, 3GPP is studying A-EUTRA (Advanced） EUTRA), which realizes higher-speed data transmission and has upward compatibility with EUTRA. In EUTRA, a communication system is premised on a network in which base station apparatuses have 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, machine type communication (MTC) performed using a low mobility or fixed communication device (terminal device and / or base station device) other than a mobile phone such as a smart meter is examined (Non-Patent Document 1). ).

In Non-Patent Document 1, when reducing the cost of machine-type communication, there is a possibility that functions that could be realized in the past cannot be realized or are difficult to realize.

When performing machine type communication, there is a possibility that a conventional communication device (terminal device and / or base station device) may not have a function that can be realized, so the conventional transmission power control method and transmission control method are used as they are. I can't.

The present invention has been made in view of the above points, and an object thereof is to provide a terminal device, a base station device, and a method capable of efficiently controlling communication even in the case of machine type communication. .

(1) In order to achieve the above object, the present invention has taken the following measures. That is, a terminal apparatus according to an aspect of the present invention is a terminal apparatus that communicates with a base station apparatus, and supports a first function, and has a first function in a master information block (MIB). When information related to the setting of PDCCH (Physical Downlink 設定 Control Channel) is included, a buffer unit temporarily buffers information related to the setting of PDCCH, and the buffer unit receives a system information block (SIB) Thus, if an overflow occurs, information regarding the setting of the PDCCH is preferentially held, and the overflowed SIB is flushed.

(2) 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 supports the first function, and the first function is included in the master information block (MIB). When information related to PDCCH (Physical Downlink Control Control Channel) settings for a terminal device having a PDCCH is temporarily buffered, and a system information block (SIB) is received. Thus, if an overflow occurs, there is a step of preferentially holding information on the setting of the PDCCH and a step of flushing the overflowed SIB.

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. 2 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.

<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.

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. Even when the physical channel is changed or added, the description of each embodiment of the present invention will be 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.

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 (the last 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 before the uplink subframe from the same terminal equipment, 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.

TDD can be applied to frame structure type 2. 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.

Various processes provided in a communication device (terminal device and / or base station device, device, module) to realize low cost and low complexity (low complexity design / configuration, simple design / configuration) of machine type communication The number and function of the units (transmitting unit, receiving unit, control unit, etc.) may be limited. For example, there may be provided only one RF (Radio Frequency) unit, IF (Intermediate Frequency) unit, and baseband unit used for the transmission unit and the reception unit. That is, it may be shared by the transmission unit and the reception unit. Filter unit, SC-FDMA (Single Carrier-Frequency Division Multiple Access) signal transmitter / receiver, OFDM signal transmitter / receiver, uplink subframe generator, downlink subframe generator used in transmitter and receiver The bandwidth supported by the part or the like may be limited (for example, 1.4 MHz). Further, the power class / power value may be lower than that of the conventional transmission unit or reception unit due to the limited performance of the amplifier used in the transmission unit or reception unit. That is, the communicable range (coverage) of a communication device that implements machine type communication may be narrower than that of a conventional communication device. Further, the number of antennas (antenna ports) provided in the transmission unit and the reception unit may be limited. That is, the function of performing MIMO (Multiple Input Multiple Output) may not be supported.

The terminal device used for machine type communication according to the present invention may be referred to as an MTC terminal or a low-complex terminal (LC terminal) in order to distinguish it from a terminal device such as a mobile phone. In the present invention, the terminal device includes an MTC terminal. The terminal device of the present invention may include an LC terminal. The terminal device of the present invention may include an extended coverage terminal (EC terminal). Moreover, the communication apparatus according to the present invention may have a function of supporting coverage extension in order to ensure a communicable range or communication quality. That is, the terminal device of the present invention may be referred to as an extended coverage terminal. The terminal device of the present invention may be referred to as a low complexity terminal. In addition, the MTC terminal may be referred to as an LC terminal or an EC terminal. That is, the MTC terminal may include an LC terminal or an EC terminal. However, the LC terminal and the EC terminal may be distinguished as different types / categories. A terminal that supports LTE communication technology / service may be referred to as an LTE terminal. The MTC terminal is a part of the LTE terminal, but is a low-cost and low-complex terminal as compared with the conventional LTE terminal. That is, the MTC terminal is an LTE terminal specialized / limited to a specific function. Here, a conventional LTE terminal is simply referred to as an LTE terminal.

LC terminals are targeted for low-end (eg, low average sales per user, low data rate, delay tolerant) applications such as MTC. The LC terminal shows terminal category 0, and the performance regarding transmission and reception is inferior compared with the terminals of other categories. The LC terminal may be referred to as a category 0 terminal.

In addition, the LC terminal basically includes a low-end model terminal, but the EC terminal may include both a low-end model and a high-end model. EC-related functions may be used not only in category 0 but also in other categories of terminals.

The LC terminal may access only the cell indicated by the SIB1 that supports LC terminal access. If the cell does not support the LC terminal, the LC terminal considers that cell access prohibited.

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

S1 signaling is expanded to include terminal radio function information for paging. When the paging-specific function information is provided to the MME (Mobility Management Entity) by the base station apparatus, the MME uses this information to instruct the base station apparatus that the paging request from the MME relates to the LC terminal.

In contrast, EC terminals are intended to expand coverage and / or improve communication quality within the coverage. For example, it is assumed that the EC terminal communicates in a place where the communication environment is poor, such as a basement.

The terminal device function information (UE radio access capability, UE UEEUcapability) 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, a physical downlink control channel (PDCCH), an extended physical downlink control channel (EPDCCH), a physical downlink shared channel (PDSCH), 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. In the time domain, when a normal cyclic prefix (NCP: PNormal 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 a terminal device identifier, PDSCH scheduling information, PUSCH scheduling information, modulation scheme, coding rate, and retransmission parameter is transmitted. 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, a synchronization signal (SS), a physical broadcast channel (PBCH), or a downlink reference signal (DLRS) may be arranged in the downlink subframe. DLRS includes cell-specific reference signal (CRS) transmitted on the same antenna port (transmission port) as PDCCH, channel state information reference signal (CSI-RS) used for measurement of channel state information (CSI), There are a terminal-specific reference signal (UERS) transmitted through the same antenna port as the PDSCH, a demodulation reference signal (DMRS) transmitted through the same transmission port as the EPDCCH, and the like. 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, a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and the like are allocated. Also, an 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, 7 SC-FDMA symbols are added when a normal cyclic prefix (Normal CP) is added and 6 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.

The synchronization signal is composed of three types of primary synchronization signals (PSS) and secondary synchronization signals (SSS) 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 physical broadcast channel (PBCH) 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 the PBCH to which BCH (Broadcast Channel) is mapped is 40 ms.

PBCH is allocated using 6 RBs (that is, 72 REs) at the center of the transmission bandwidth. The PBCH is transmitted in four consecutive radio frames starting from a radio frame satisfying SFN (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. Also, the base station apparatus does not map PDSCH to the same resource as PBCH or CRS.

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

MIB contains system information transmitted on 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.

System information transmitted outside the MIB is transmitted in 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. Also, all SIBs are transmitted on DL-SCH (Downlink Shared Channel). The DL-SCH may be referred to as DL-SCH data or DL-SCH transport block.

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

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

The resource allocation of the PDSCH to 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. PCH may be referred to as PCH data or a PCH transport block.

SIB has different system information that can be sent 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 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, system information block type 3 (SIB3) includes information common to cell reselection within a frequency, between frequencies, and between RAT (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.

When the received MIB includes information related to PDCCH setting for the MTC terminal, the MTC terminal receives the PDCCH for the MTC terminal based on the information. The information may include a resource block index (frequency position) to which a PDCCH for the MTC terminal for the transmission bandwidth is allocated. The information may also include an index indicating the start position (start position, start symbol) of the OFDM symbol to which the PDCCH for the MTC terminal is assigned. The information may include the number of OFDM symbols necessary for PDCCH for the MTC terminal. These pieces of information may be provided / updated to the MTC terminal by other SIB or dedicated signaling.

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 a fairly good channel condition and can be decoded in a single reception.

MIB (or PBCH) uses a fixed schedule that repeats within 40 ms with a period of 40 ms. The first transmission of the MIB is scheduled in subframe # 0 of the 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. SFN is synonymous with a radio frame number.

When the base station device (PLMN, EUTRA) indicates that the terminal device supports the function related to MTC (the function related to LC (Low Mobility), the function related to Enhanced Enhanced Coverage (EC)) using the function information. If the access of the MTC terminal can be permitted (has a cell that can permit the access of the MTC terminal), information on the setting of the physical channel (PDCCH / EPDCCH, PDSCH, PHICH, PBCH, etc.) for the MTC terminal in the spare bit of the MIB / The parameter may be set and the MIB may be transmitted. Note that the base station apparatus may provide an accessible cell to the MTC terminal using higher layer signaling. The base station apparatus may be configured to repeatedly transmit MIB (PBCH) transmission to the MTC terminal not only in the above-described subframe and radio frame but also in a shorter cycle. For example, the PBCH for the MTC terminal may be transmitted in the MBSFN subframe. Also, the MIB for the MTC terminal may be transmitted in a measurement gap subframe. On the other hand, the reception accuracy may be improved by repeatedly receiving more in the MTC terminal. In such a PBCH, it is not preferable that the scrambling sequence generator is initialized using an initial value (parameter) during repeated transmission or reception. Therefore, the scrambling sequence generator in such a PBCH has a longer period. It may be initialized. That is, the number of receptions of PBCH corresponding to the MIB increases, but the timing for initializing the scrambling sequence generator may be adjusted according to the number of repetitions.

During repeated transmission (repeated transmission period), a terminal device that does not support simultaneous transmission / reception does not expect to be able to receive a downlink signal in a downlink subframe or a special subframe.

During repeated reception (repeated reception period), a terminal device that does not support simultaneous transmission / reception does not expect to be able to transmit an uplink signal in an uplink subframe or a special subframe.

When information related to the PBCH setting for the MTC terminal is set in the MIB spare bit, the MTC terminal can monitor the PBCH for the MTC terminal based on the setting. The system information transmitted by this PBCH includes information on PHICH / EPHIICH (Enhanced （PHICH) settings for MTC terminals, information on settings of other physical channels, carrier frequency for MTC terminals, downlink transmission bandwidth for MTC terminals, and / Or uplink transmission bandwidth may be included. In such a case, the base station apparatus may schedule the radio resource allocated to the MTC terminal so as not to allocate the radio resource to the LTE terminal. That is, the base station apparatus may perform scheduling so that FDM is performed between the MTC terminal and the LTE terminal.

Information indicating whether various physical channel settings for the MTC terminal are set in the SIB or RRC message may be set in the MIB spare bit. For example, when the PDCCH / EPDCCH setting for the MTC terminal is set in the SIB or RRC message, the value of the corresponding spare bit is set to “1”. When the PDCCH / EPDCCH setting for the MTC terminal is not set in the SIB or RRC message, the value of the corresponding spare bit is set to “0”. Similarly, when the PDSCH setting for the MTC terminal is set in the SIB or RRC message, the value of the corresponding spare bit is set to “1”. When the PDSCH setting for the MTC terminal is not set in the SIB or RRC message, the value of the corresponding spare bit is set to “0”. PBCH (BCCH), PHICH, PRACH (RACH), PUSCH, PUCCH, PCCH (Paging Control Channel), CCCH (Common Control な ど Channel), and the like may be similarly indicated. The MTC terminal may read the value of the corresponding bit, acquire the setting information from the corresponding SIB or RRC message, and perform transmission and reception of the corresponding signal.

In the MIB spare bit, radio resource allocation information (resource setting, subframe setting, transmission bandwidth, start symbol, etc.) accessible by the MTC terminal may be set. Based on the information, the MTC terminal can receive PBCH (second PBCH) and PDCCH (second PDCCH or EPDCCH) for the MTC terminal. The PHICH setting corresponding to the PDCCH may be set in the system information corresponding to the PBCH. Various RNTI values may be set in the system information. When the CRC of the PDCCH is scrambled by SI-RNTI, system information corresponding to the MTC terminal can be received on the PDSCH (DL-SCH) corresponding to the PDCCH. Based on the system information, the MTC terminal can acquire information related to various physical channel / physical signal settings for the MTC terminal. The information regarding these settings may include the number of repetitions. In addition, the information related to these settings may include information related to the power class. Further, the information regarding these settings may include the value of each RNTI.

In the system information on the second PBCH, the downlink transmission bandwidth for the MTC terminal and the start symbol of the second PDCCH / EPDCCH may be indicated. The MTC terminal can receive the second PDCCH / EPDCCH based on the downlink transmission bandwidth and the start symbol. Further, if there is a CRC scrambled by SI-RNTI in the second PDCCH / EPDCCH, an SIB (SI message) for the MTC terminal can be detected. Information regarding the setting of the physical channel / physical signal indicated in the SIB is the physical channel / physical signal corresponding to the MTC terminal. The MTC terminal can transmit / receive a physical channel / physical signal based on the set information. If there is a CRC scrambled by P-RNTI in the second PDCCH / EPDCCH, the PCH for the MTC terminal can be detected. In such a case, SI-RNTI and P-RNTI may be predetermined values.

As described above, the base station apparatus sets the setting information for the MTC terminal in the MIB spare bits, thereby making the information related to the setting of various physical channels / physical signals for the MTC terminal different from the LTE terminal. It can be set using radio resources.

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 (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) that is 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 SI window, MBSFN (Multimedia Broadcast multicast service Single Frequency Network) subframe, TDD uplink subframe, subframe # 5 of radio frame in which the remainder of SFN divided 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.

When the base station device (PLMN, EUTRA) indicates that the terminal device supports the function related to MTC (the function related to LC (Low Mobility), the function related to Enhanced Enhanced Coverage (EC)) using the function information. If the access of the MTC terminal can be permitted (has a cell that can permit the access of the MTC terminal), the physical channel (PDCCH / EPDCCH, PDSCH, PHICH, etc.) for the MTC terminal in the SIB (either SIB1 or SI message) It is also possible to set information / parameters related to the setting and transmit the SIB. The base station apparatus may be configured to repeatedly transmit the SIB (SIB1, SI message, new SIB type) to the MTC terminal in a shorter cycle than the above-described subframe and radio frame. For example, the SIB for the MTC terminal may be transmitted in the MBSFN subframe. Further, the SIB for the MTC terminal may be transmitted in a subframe of the measurement gap. On the other hand, the reception accuracy may be improved by repeatedly receiving more in the MTC terminal. Since it is not preferable that the scrambling sequence generator is initialized based on the initial value (parameter) in the middle of repeated transmission or reception, the PDCCH and PDSCH corresponding to such SIB are not scrambled in such PDCCH or PDSCH. The ring sequence generator may be initialized with a longer period. That is, the number of receptions of PDCCH and PDSCH corresponding to SIB increases, but the timing for initializing the scrambling sequence generator may be adjusted using the initial value according to the number of repetitions.

For example, when the terminal device supports the function of repeatedly receiving downlink signals, and when the base station device supports the function of repeatedly transmitting downlink signals, the scrambling used for the downlink signals The initialization of the generator of the ring sequence or the pseudo random sequence may be performed at a timing different from the conventional timing. Also, the initial value (parameter) used for initialization of the scrambling sequence or pseudo-random sequence generator used for the downlink signal may be set using higher layer signaling, system information, or MIB. For example, the initial value used for initialization of the generator is determined based on PCI, slot number, etc., but is determined using a higher layer parameter or a predetermined value (for example, RNTI value) different from that. Also good.

For example, when the terminal device supports the function of repeatedly transmitting uplink signals, and when the base station device supports the function of repeatedly receiving uplink signals, the scrambling used for the uplink signals The initialization of the generator of the ring sequence or the pseudo random sequence may be performed at a timing different from the conventional timing. The initial value (parameter) used for initialization of the scrambling sequence or pseudo-random sequence generator used for the uplink signal may be set using higher layer signaling, system information, or MIB. For example, the initial value used for initialization of the generator is determined based on PCI, slot number, etc., but is determined using a higher layer parameter or a predetermined value (for example, RNTI value) different from that. Also good.

The RNTI that scrambles the 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 configured through 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 set 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, as with all SI messages.

The terminal device applies the system information capturing procedure to capture 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 must have a valid version of the necessary system information.

If in idle mode, system information block type 8 (SIB8) that depends on the support of the relevant RAT or system information block type that depends on support of WLAN (Wireless Local Area Network) interworking assisted by RAN (Radio Access Network) 17, not only SIB2 but also MIB and SIB1 are required.

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

The terminal device deletes the system information three hours after confirming that the stored system information is valid.

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 terminal device is in the connection mode when the RRC connection is established. The terminal device is in the idle mode when the RRC connection is not established.

In a terminal device in idle mode, DRX specific to the terminal device may be set by an upper layer. Further, mobility is controlled in the terminal device in the idle mode. Also, the terminal device in the idle mode changes the PCH in order to detect an incoming call or change of system information, an ETWS notification for a terminal device capable of ETWS, and a CMAS notification for a terminal device capable of CMAS. Monitor. Also, the terminal device in the idle mode performs neighboring cell measurement and cell (re) selection. The terminal device in the idle mode captures system information. Also, the terminal device in the idle mode records the available measurement with the location and time for the terminal device for which the recorded measurement is set.

The terminal device in the connection mode transmits unicast data from / to the terminal device. In the lower layer, the terminal device in the connection mode may set DRX specific to the terminal device. For terminal devices that support carrier aggregation, one or more SCells aggregated with PCells are used to expand the bandwidth. For terminal devices that support dual connectivity, one SCG (Secondary Cell Group) that is aggregated with MCG (Master Cell Group) is used to expand the bandwidth. Further, the mobility of the terminal device in the connection mode is controlled in the network. In addition, the terminal device in the connection mode can change the system information, PCH and / or SIB1 content in order to detect ETWS notification for terminal devices capable of ETWS and CMAS notification for terminal devices capable of CMAS. To monitor. The terminal device in the connection mode also monitors the control channel associated with the shared data channel to determine if data is scheduled. Further, the terminal device in the connection mode provides channel quality and feedback information. The terminal device in the connection mode performs neighboring cell measurement and measurement report. Further, the terminal device in the connection mode captures system information.

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). 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, 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.

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 the actual setting. 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.

The downlink reference signal (DLRS) is classified into a plurality of types depending on its use. For example, the CRS is a pilot signal transmitted at a predetermined power for each cell, and is a downlink reference signal 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 also uses the CRS as a PDCCH transmitted simultaneously with the CRS or a reference signal for demodulating the PDSCH. As a sequence used for CRS, a sequence identifiable for each cell is used.

DLRS is also used for estimation of downlink propagation path fluctuation (channel estimation). The DLRS used for estimating the channel fluctuation is referred to as a channel state information reference signal (CSI-RS). In addition, DLRS individually set for a terminal device is referred to as UERS, DMRS, or Dedicated RS, and is referred to for channel propagation compensation processing when demodulating EPDCCH (Enhanced PDCCH) or PDSCH. The

The channel state information (CSI) includes a reception quality indicator (CQI), a precoding matrix indicator (PMI), a precoding type indicator (PTI), and a rank indicator (RI), respectively, and a suitable modulation scheme and coding rate, It can be used to specify (represent) a suitable precoding matrix, a suitable PMI type, and a suitable 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 physical downlink control channel (PDCCH) is transmitted with several OFDM symbols (for example, 1 to 4 OFDM symbols) from the top of each subframe. The extended physical downlink control channel (EPDCCH) is a PDCCH arranged in an OFDM symbol in which the PDSCH is arranged. 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 the terminal apparatus (UE) and the relay station apparatus (RN) of the PCH (Paging Channel) and DL-SCH resource allocation and the HARQ information (DL HARQ) regarding the DL-SCH. The PDCCH is used to transmit an uplink scheduling grant and a side link scheduling grant.

The EPDCCH is used for notifying the 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.

PDCCH is transmitted by aggregating one or several consecutive control channel elements (CCEs). One CCE corresponds to nine resource element groups (REG). The number of CCEs available in the system is determined excluding the physical control format indicator channel (PCFICH) and the physical HARQ indicator channel (PHICH). The PDCCH supports a plurality of formats (PDCCH format). Each PDCCH format defines the number of CCEs, the number of REGs, and the number of PDCCH bits. One REG is composed of 4 REs. That is, up to 3 REGs may be included in 1 PRB. The PDCCH format is determined according to the size of the DCI format.

Since a plurality of PDCCHs are mapped to the entire downlink transmission bandwidth, the terminal device continues decoding until it detects a PDCCH addressed to itself. That is, the PDCCH cannot be detected even if only a part of the frequency region is received and decoded.

Multiple 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.

Before transmitting / receiving layer 2 messages and layer 3 messages (paging, handover command, etc.) that are downlink data and higher layer control information, the terminal apparatus monitors (monitors) the PDCCH addressed to itself and By receiving the PDCCH, it is necessary to acquire radio resource allocation information called an uplink grant during transmission and a downlink grant (downlink assignment) during 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. In addition, 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 device can set various parameters of the corresponding uplink signal and downlink signal based on the detected DCI (value set in 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 format) by decoding a PDCCH accompanied by a CRC (Cyclic Redundancy Check) scrambled by a specific RNTI (Radio Network Temporary Identifier). Which RNTI scrambles the PDCCH with CRC scrambled is set by higher layers.

The 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 (PagingPRNTI), information related to paging is transmitted by the PCH. Further, when scrambled by SI-RNTI (System Information Information RNTI), system information may be transmitted using the DL-SCH.

Also, the DCI format is mapped to a search space (shared search space (CSS), UE specific search space (UESS)) given 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.

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

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

The physical downlink shared channel (PDSCH) is a terminal device that uses downlink data (DL-SCH data, DL-SCH transport block) as well as broadcast information (system information) not notified by PCH, paging or PBCH as a layer 3 message. Used to notify 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.

Also, PDSCH may be used to broadcast system control information.

Also, 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.

Also, 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.

Also, 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 physical uplink control channel (PUCCH) is a downlink data reception confirmation response (HARQ-ACK; Hybrid Automatic Repeat reQuest-Acknowledgement or ACK / NACK (or ACK / NAK) or Acknowledgement / NegativeAntegment / Negemgent). It is used for downlink channel (channel state) information (CSI) reporting and 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.

1RB 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.

When the number of repetitions is set for the PUCCH, the pseudo random sequence generator may not be initialized using the initial value until the repeated transmission of the PUCCH is completed.

The physical uplink shared channel (PUSCH) mainly transmits uplink data (UL-SCH data, UL-SCH transport block) and control data, and uplinks such as CSI, ACK / NACK (HARQ-ACK), and SR. It is also possible to include link control information (UCI). 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.

When the number of repetitions is set for the PUSCH, the scrambling sequence generator does not have to be initialized using the initial value until the repeated transmission of the PUSCH is completed.

The uplink reference signal (uplink pilot signal, uplink pilot channel, ULRS) is mainly divided into a demodulation reference signal (DMRS) used by the base station apparatus to demodulate PUCCH and / or PUSCH, and a base station apparatus. Includes a sounding reference signal (SRS) used for estimating an uplink channel state. The SRS includes a periodic sounding reference signal (P-SRS) transmitted periodically and an aperiodic sounding reference signal (A-SRS) transmitted when instructed by the base station apparatus. . P-SRS is called trigger type 0 SRS, and A-SRS is called 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 the PUCCH, if the shortened format is applied, the PUCCH resource is not allocated to the last symbol of the subframe in the subframe set to the cell-specific subframe setting. 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.

The physical random access channel (PRACH) 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. PRACH is used as an access means (such as initial access) to a base station apparatus of a 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).

The layer 3 message is a message handled in the control plane (CP, C-Plane) protocol exchanged between the terminal device and the base station device in the RRC (Radio Resource Control) layer, and is synonymous with RRC signaling or RRC message. Can be used. A protocol that handles user data (uplink data and downlink data) with respect to the control plane is referred to as a user plane (UP, U-Plane). Here, the transport block that is transmission data in the physical layer includes a C-Plane message and U-Plane data in the upper layer. That is, in each embodiment of the present invention, data and transport block are synonymous. Detailed descriptions of other physical channels are omitted.

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 the same frequency and / or different frequency areas 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 turning on the power (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.

When the terminal device is turned 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, if available, that the access layer uses for cell selection / reselection.

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 device 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.

A 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 in idle mode terminal devices.

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

(A2) When registered, if the terminal device attempts to establish an RRC connection, it performs initial access to 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 ETWS (Earthquake Tsunami Warning System) and CMAS (Commercial Mobile Alter System) notifications.

(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) setting is maintained and all running timers continue to run, but the terminal device is idle mode tasks (e.g., 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 PLMN selection, the terminal device reports a PLMN that can be used to the NAS either by 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 an 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 is reported to the NAS along with the RSRP value. 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 in order to camp. When the terminal device cannot camp on the provided CSG-ID cell, the AS provides the information to the NAS.

In the cell selection / reselection, the terminal device 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 in the terminal device.

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 measured value of RSRP or RSRQ is a good result).

If the cell selection / reselection is changed in the received system information about the 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.

Retention information cell selection requires the carrier frequency information and optionally further information on cell parameters from the previously received measurement control information element 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.

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 device does not consider a blacklisted cell as a candidate for cell reselection.

The terminal device takes over the priority and continuous validity time 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 CSG-ID that can be used by NAS along with PLMN and “HNB (Home Node B) name” (if reported) To report.

If the NAS selects the 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 an appropriate cell for camping.

In addition to standard cell reselection, the terminal device detects at least a previously visited (accessed) CSG member cell when at least one CSG-ID associated with the PLMH identifier is included in the CSG whitelist of the terminal device Therefore, 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, it reselects this 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 an 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 a specific rule.

In addition to the standard cell reselection rule, the terminal device uses the autonomous search function to detect at least a previously visited hybrid cell whose PLMN identifier associated with the CSG-ID is in the CSG whitelist according to the characteristic requirement. If the PLMN identifier related to 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 the terminal is in a 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 according to 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 inside the terminal device and / or the cell reselection estimation procedure is changed.

When transitioning from the connection mode to the idle mode, the terminal device attempts to camp on an appropriate cell according to the information (redirectedCarrierInfo) regarding the redirected carrier if included in the RRC connection release message. 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 the terminal 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 according to 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 apparatus executes the cell reselection estimation procedure when the information on the BCCH (Broadcast Control Channel) used for the trigger inside the terminal apparatus and / or the cell reselection estimation procedure is changed.

(C5) The terminal equipment periodically tries all frequencies of all RATs supported by the terminal equipment 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 allows 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 UL-SCH to which an RRC message related to the RRC connection request is mapped) to the base station device (camping cell, EUTRAN, PLMN). When the base station apparatus receives it, 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 MTC terminal in the idle mode supports the MTC function until the initial access by the random access procedure is completed, the RRC connection is established, or the UL-SCH corresponding to the random access response grant is used. PDCCH may be monitored with the downlink transmission bandwidth indicated in MIB.

When the MTC terminal in the idle mode performs initial access according to the random access procedure, it may select a sequence indicating that it is an MTC terminal and transmit a random access preamble of the sequence. When the base station apparatus receives the random access preamble, if the access of the MTC terminal is permitted, the base station apparatus may set the downlink resource allocation for the MTC terminal in the spare bit of the MIB. The MTC terminal detects the PDCCH corresponding to the random access response from the resource, completes the initial access, and establishes the initial RRC connection.

The terminal device in the idle mode may receive a paging message using DRX (Discontinuous Reception) in order to reduce power consumption. 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 IMSI (International Mobile Subscriber Identity), when making an emergency call without USIM (Universal Subscriber Identity Module), the terminal device uses a 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 idle mode MTC terminal performs PLMN reselection and cell reselection if information related to PDCCH configuration for the MTC terminal or information related to downlink resource allocation cannot be detected in the MIB.

A terminal device indicating category 0 is one TTI, C-RNTI (Cell RNTI) / SPS (Semi-Persistent Scheduling) C-RNTI / P-RNTI / SI-RNTI / RA-RNTI (Random Access RNTI) 1000 bits can be received for the transport block associated with. Also, a terminal device indicating category 0 can receive up to 2216 bits for other transport blocks related to P-RNTI / SI-RNTI / RA-RNTI with one TTI.

Requirement for UE category 0 is due to the assumption of UE category 0 and a single antenna receiver. Such a condition is referred to as UE category 0 applicability.

Category 0 terminal monitors downlink quality based on CRS in order to detect downlink radio link quality of PCell.

The category 0 terminal estimates the downlink radio link quality, and compares the two threshold values (Q _{out_Cat0} and Q _{in_Cat0} ) with the estimated value in order to monitor the downlink radio link quality of the PCell.

The threshold value _{Qout_Cat0} is defined as a level corresponding to a 10% block error rate of PDCCH transmission assumed in consideration of a PCFICH error with a transmission parameter, in which a downlink radio link cannot be reliably received.

The threshold Q _{in_Cat0} corresponds to a 2% block error rate of PDCCH transmission that can be received more reliably than the threshold Q _{out_Cat0} by taking into account PCFICH errors with transmission parameters.

For example, the out-of-sync PDCCH / PCFICH transmission parameters for UE category 0 are in DCI format 1A, and the number of OFDM symbols in PDCCH is determined based on the bandwidth. When the bandwidth is 10 MHz or more, the number of OFDM symbols is 2 symbols. When the bandwidth is 3 MHz or more and less than 10 MHz, the number of OFDM symbols is 3 symbols. When the bandwidth is 1.4 MHz, the number of OFDM symbols is 4 symbols. The aggregation level of the PDCCH is 4 when the bandwidth is 1.4 MHz, and 8 when the bandwidth is 3 MHz or more. The ratio of the RE energy of PDCCH (EPRE: Energy Per Resource Element) and the average RE energy of RS is 4 dB regardless of the number of antenna ports of the PCell CRS. The ratio of the PCFICH RE energy and the average RE energy of RS is 4 dB when the number of CRS antenna ports is 1 antenna port, and 1 dB when the number of CRS antenna ports of PCell is 2 or 4 antenna ports. is there.

For example, the PDCCH / PCFICH transmission parameter for in-sync for UE category 0 is DCI format 1C, and the number of OFDM symbols of PDCCH is determined based on the bandwidth. When the bandwidth is 10 MHz or more, the number of OFDM symbols is 2 symbols. When the bandwidth is 3 MHz or more and less than 10 MHz, the number of OFDM symbols is 3 symbols. When the bandwidth is 1.4 MHz, the number of OFDM symbols is 4 symbols. The aggregation level of PDCCH is 4. The ratio of the RE energy of PDCCH and the average RE energy of RS is 1 dB regardless of the number of CRS antenna ports. The ratio of the RE energy of PCFICH and the average RE energy of RS is 4 dB when the number of antenna ports of PCell CRS is 1 antenna port, and when the number of antenna ports of PCell CRS is 2 or 4 antenna ports, 1 dB.

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.

Also, it is 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.

Also, 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 requesting a radio resource 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, while the SCell does not need to perform these.

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 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 can 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, a plurality of configured serving cells include one PCell and one or a plurality of SCells.

PCell is a serving cell in which an initial connection establishment procedure (RRC connection procedure procedure) has been performed, a serving cell that has started a connection re-establishment 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 MTC terminal may support only one radio access technology (RAT).

Also, the MTC terminal may support only one operating band. That is, the MTC terminal may not support a function related to carrier aggregation.

In addition, the MTC terminal may support only TDD (Time Division Duplex) and HD-FDD (Half Duplex Frequency Division Division). In other words, the MTC terminal does not have to support FD-FDD (Full-Duplex-FDD). The MTC terminal may indicate which duplex mode / frame structure type is supported via higher layer signaling such as functional information.

Further, the MTC terminal may be a category 0 or category 1 LTE terminal. That is, the maximum number of bits of a transport block that can be transmitted / received by one MTI terminal in one TTI (Transmission Time Interval) may be limited. For example, the maximum number of bits per TTI may be limited to 1000 bits. In LTE, 1 TTI corresponds to 1 subframe.

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

Also, the MTC terminal may support only one duplex mode / frame structure type.

Frame structure type 1 can be applied 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.

Also, the MTC terminal may support only a narrow bandwidth such as 1.4 MHz in the downlink and uplink. That is, the MTC terminal does not have to communicate with a wide bandwidth such as 20 MHz.

The MTC terminal whose available bandwidth is limited may be operated with any system bandwidth. For example, scheduling for an MTC terminal that supports only a bandwidth of 1.4 MHz may be performed in an operating band having a system bandwidth of 20 MHz.

Also, the MTC terminal may support only one RF unit / baseband unit (eg, 1.4 MHz RF bandwidth) in the downlink and uplink.

The base station apparatus may perform control / schedule so that FDM can be performed between a terminal that supports MTC (MTC terminal) and a terminal that does not support MTC (non-MTC terminal). That is, scheduling such as radio resource allocation for MTC terminals is performed in consideration of scheduling such as radio resource allocation for non-MTC terminals.

Re-tuning time when frequency hopping or usage frequency is changed may be set by higher layer signaling.

The transmission power for the MTC terminal may be reduced. The power class or the like may be set exclusively for the MTC terminal.

For example, in the MTC terminal, the number of supported downlink transmission modes (PDSCH transmission modes) may be reduced. That is, when the base station apparatus indicates the number of downlink transmission modes as the function information from the MTC terminal or the downlink transmission mode supported by the MTC terminal, 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 MTC terminal is set, the MTC terminal may ignore the setting. That is, the MTC 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.

Also, in the MTC terminal, the processing load in the downlink and uplink may be reduced as compared with the conventional LTE terminal.

For example, in an MTC terminal, the maximum transport block size for supported unicast and broadcast signaling may be reduced. In addition, the number of downlink signals that can be received simultaneously may be reduced. Also, transmission and reception EVM (Error Vector Vector) requirements, including limited modulation schemes, may be relaxed. Physical control channel processing may be reduced (eg, reducing the number of blind decoding). Also, physical data channel processing may be reduced (eg, downlink HARQ timeline relaxation, number of HARQ processes, etc.).

Also, the number of CQI / CSI reporting modes supported in the MTC terminal may be reduced. That is, when the base station apparatus indicates the number of CQI / CSI report modes or the CQI / CSI report mode supported by the MTC terminal as the function information from the MTC terminal, the base station apparatus is based on the function information. Then, the CQI / CSI report mode may be set. In addition, when a parameter for a CQI / CSI report mode that is not supported by the MTC terminal is set, the MTC terminal may ignore the setting. That is, the MTC terminal does not have to perform processing for the CQI / CSI report mode that is not supported.

In the MTC terminal, a technique for extending (improving) coverage may be applied in order to reduce power consumption. These techniques may be applied to both FDD and TDD.

As a coverage extension technique, a subframe bundling technique with HARQ for a physical data channel (for example, PDSCH, PUSCH) may be included.

Further, as a coverage extension technique, use of a control channel (for example, PCFICH, PDCCH) may be restricted.

Further, as the coverage extension technique, an iterative technique for a control channel (for example, PBCH, PRACH, PDCCH / EPDCCH) may be included. Here, the iterative technique refers to, for example, data mapped to physical channels / physical signals (UL-SCH data, DL-SCH data, user data, control data, etc.) every transmission (each transmission subframe, every TTI) It is to transmit without changing to. That is, it means that a physical channel / physical signal to which the same data is mapped is transmitted a predetermined number of times. On the other hand, bundling may change data to be mapped for each transmission. In the iterative technique, reception accuracy can be improved by performing reception signal addition processing as reception processing.

Also, as a coverage extension technique, a restriction or repetition technique may be included for PBCH, PHICH, and PUCCH.

Also, as a coverage extension technique, power boost by supporting a bandwidth (for example, 0.5 PRB) narrower than 1 PRB (Physical Resource Block) may be supported. That is, it may be supported that the power density is improved.

Moreover, resource allocation using EPDCCH with cross carrier scheduling and repetition may be included as a coverage extension technique. Also, an operation without EPDCCH may be considered.

Also, as a coverage extension technology, a new physical channel format for SIB (System Information Block) / RAR (Random Access Response) / paging may be included. Information related to RAR and paging (PCH) is transmitted by being mapped to DL-SCH indicated by PDCCH (DCI format) with CRC scrambled by a certain RNTI, but parameters corresponding to coverage extension are added as DCI May be. For example, the DCI field included in the DCI format may be different depending on the type of scrambled RNTI. DCI indicating the repetition time (number of repetitions) may be included. The value set in DCI indicating the repetition time (number of repetitions) may be determined based on information to be transmitted. That is, depending on the type of scrambled RNTI, a value set in DCI indicating the repetition time (repetition count) may be determined, or DCI indicating the repetition time (repetition count) is included in the DCI format. It does not have to be.

Also, SIB corresponding to channel bandwidth and coverage extension may be included as a coverage extension technique.

Further, as the coverage extension technique, an increase in the density of reference symbols and a frequency hopping technique may be supported.

As coverage extension technology, the probability of miss detection for PRACH and the initial acquisition time (initial synchronization time) between the terminal and the system for PSS / SSS / PBCH / SIB are considered even if the impact on power consumption to the terminal is considered. Good.

Also, as a coverage extension technique, a necessary coverage extension amount may be set for each cell, for each terminal, for each channel, or for each group of channels. Measurements and reports corresponding to the coverage extension may be defined.

Also, the coverage extension technology and the coverage extension function may be applied to each of the MTC terminal and the LTE terminal.

For physical layer control signaling (for example, EPDCCH) and higher layer control signaling (for example, SIB, RAR, and paging message), a common solution may be applied to a low-complexity terminal and a coverage extension terminal.

A power consumption reduction method for extending battery life may be applied to both standard coverage and extended coverage UE categories / types. For example, the actual transmission / reception time is reduced. Minimize the number of repetitive transmissions and receptions by minimizing control messages. Further, channel / signal change, improvement, redesign, addition / reduction may be performed. Also, measurement time, measurement report, feedback signaling, system information acquisition, synchronization acquisition time, etc. may be optimized to reduce power consumption.

MTC technology and coverage extension technology may be optimized for HD-FDD and TDD.

If the terminal device satisfies the requirements for MTC and / or coverage extension, the processing related to mobility may be reduced.

If the MTC terminal cannot search for an RF channel for PLMN selection / cell selection for a certain period of time and find an appropriate cell, it may turn off the power.

In the RRC idle state (idle mode), the MTC terminal may continue to receive and synthesize the PBCH until the MIB can be detected.

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 such a case, since the power density of the PUCCH is higher than the power density of the PUSCH, the terminal apparatus may be set in consideration of a predetermined power offset in order to adjust the transmission power of the PUCCH. If the PUSCH can be detected in the base station apparatus, the PUCCH can also be detected, so that it is not necessary to allocate much power to the PUCCH. However, when the PUCCH is repeatedly transmitted alone, the terminal device does not need to consider this predetermined power offset. When the PUCCH is repeatedly transmitted alone, it is preferable that the base station apparatus can detect it in a shorter interval. The number of repetitions of PUCCH is the number of repetitions of PUSCH in the case of simultaneous transmission of PUCCH and PUSCH. Also, the number of repetitions of PUCCH is the number of repetitions set for PUCCH in the case of transmission using only PUCCH. It may be determined whether or not the predetermined offset is applied depending on whether or not simultaneous transmission with the PUSCH is performed. When the number of repetitions is set for the terminal device, repeated transmission of all physical channels is performed based on the number.

In such a case, if the PUCCH transmission overlaps with the PUSCH transmission in the same subframe, the terminal apparatus supports the simultaneous transmission of PUCCH and PUSCH, and the same number of repetitions in the same subframe. Alternatively, PUCCH and PUSCH are transmitted simultaneously in a repeated period. In this case, the transmission power of PUCCH may be set using a power offset if it is set by higher layer signaling. Further, when the transmission of PUCCH does not overlap with the transmission of PUSCH, the terminal apparatus sets the transmission power of PUCCH without using the power offset. If it is indicated that the base station apparatus supports simultaneous transmission of PUCCH and PUSCH in a cell that allows access of an MTC terminal, it is assumed that PUCCH is transmitted at the same timing as PUSCH, and reception processing is performed. To do. For an MTC terminal that supports simultaneous transmission of PUCCH and PUSCH, the base station apparatus may set the power offset of PUCCH using higher layer signaling.

In such a case, the transmission power of PUCCH may be set based on a power control adjustment value using a transmission power control command for PUSCH. That is, it is not necessary to consider the power control adjustment value using the transmission power control command for PUCCH. However, unless otherwise specified, even when PUSCH and PUCCH are repeatedly transmitted the same number of times in the same subframe, power control adjustment values used for setting each transmission power may be set individually. Good. That is, when the base station apparatus is instructed to use the same power control adjustment value using higher layer signaling, the transmission power of PUSCH and PUCCH is set using the same power control adjustment value. When PUSCH and PUCCH are repeatedly transmitted separately, transmission power is set using each power control adjustment value. Further, when the SRS is repeatedly transmitted in the same subframe, the transmission power may be set using the same power control adjustment value.

The MIB in which the parameter (information) for the MTC terminal is set in the spare bit and the MIB in which the parameter (information) for the MTC terminal is not set are not necessarily handled as the same MIB. For example, if an MIB in which a parameter (information) for an MTC terminal is not set in a spare bit is set as MIB type A, and an MIB type B in which a parameter (information) for an MTC terminal is set in a spare bit, the MIB type A has an interval of 40 ms. However, MIB type B may be transmitted at intervals of 20 ms. The PBCH subframe and the PBCH radio frame in which the MIB type A and the MIB type B are arranged may be different subframes and radio frames. The LTE terminal receives only MIB type A, but the MTC terminal may receive MIB type A and MIB type B.

The MIB in which the parameter (information) for the MTC terminal is set in the spare bit may be transmitted not only in the above-described PBCH cycle but also in another cycle. That is, an MIB in which parameters (information) for MTC terminals are set in spare bits may be transmitted in two subframe sets. That is, the LTE terminal can receive the MIB of the first subframe set. The MTC terminal can receive the MIB of the first subframe set and the second subframe set.

SIB (SIB1, SI message, new SIB) in which parameters (information) for the MTC terminal are set may be transmitted not only in the above-described period but also in another period. That is, the SIB in which parameters (information) for the MTC terminal are set may be transmitted in two subframe sets. That is, the LTE terminal can receive the SIB of the first subframe set. The MTC terminal can receive the SIBs of the first subframe set and the second subframe set. At this time, the PDCCH and / or EPDCCH setting corresponding to the SIB corresponds to the MTC terminal. That is, the MTC terminal does not expect such SIB (DL-SCH corresponding to SIB) to be transmitted on the PDCCH / EPDCCH of the downlink bandwidth that is not supported by the MTC terminal.

The PCH including the change notification of the SIB (SIB1, SI message, new SIB) in which parameters (information) for the MTC terminal are set may be transmitted not only in the above-described period but also in another period. That is, the PCH including the SIB change notification in which parameters (information) for the MTC terminal are set may be transmitted in two subframe sets. That is, the LTE terminal can receive the PCH of the first subframe set. The MTC terminal can receive the PCH of the first subframe set and the second subframe set. At that time, the setting of PDCCH and / or EPDCCH corresponding to this PCH corresponds to the MTC terminal. That is, the MTC terminal does not expect such PCH to be transmitted on the PDCCH / EPDCCH of the downlink bandwidth that is not supported by the MTC terminal.

When the transmission bandwidth supported by the MTC terminal is narrow (for example, 5 MHz or less), only the local arrangement may be supported as the EPDCCH transmission type. That is, when the transmission bandwidth supported by the MTC terminal is narrow (for example, 5 MHz or less), the EPDCCH transmission type may not be distributed.

If a terminal device (MTC terminal) that supports the MTC function is permitted to access the cell, the terminal device that supports the MTC function monitors the PBCH and PDCCH from the cell. Also good. In such a case, when information related to the PDCCH setting for the MTC terminal is set in the MIB (or MIB spare bit) and / or SI (system information) message, the PDCCH of the MIB and / or SI message PDCCH is monitored based on resource allocation, subframe number, OFDM symbol (start symbol), and the like included in the setting. At that time, when a predetermined number of times or a predetermined period is set in the PDCCH, the MTC terminal may repeatedly receive the PDCCH to improve the reception accuracy. If the PDCCH accompanied by the CRC scrambled by the P-RNTI is received, the MTC terminal acquires paging information from the PCH indicated by the DCI included in the PDCCH. The P-RNTI is set using system information or higher layer signaling.

Further, in such a case, when the information on the PDCCH setting for the MTC terminal is not set in the MIB (or the MIB spare bit) and / or the SI message, and the information on the setting of the EPDCCH is set in the P-RNTI When the value is set, if the EPDCCH accompanied by the CRC scrambled by the P-RNTI is received, the MTC terminal acquires paging information from the PCH indicated by the DCI included in the PDCCH. In addition, the information regarding the setting of this EPDCCH is set using higher layer signaling.

Further, in such a case, when the information on the PDCCH setting for the MTC terminal is not set in the MIB (or the MIB spare bit) and / or the SI message, and the information on the setting of the EPDCCH is set in the P-RNTI If no value is set, and if the MTC terminal supports the downlink transmission bandwidth set in the MIB and / or SI message, the PDCCH region assigned to the downlink transmission bandwidth is used. If a PDCCH with a CRC scrambled by the P-RNTI is received, the MTC terminal acquires paging information from the PCH indicated by the DCI included in the PDCCH. The P-RNTI is a default value or a predetermined value. That is, the value of this P-RNTI may not be set using higher layer signaling.

Further, in such a case, when the information on the PDCCH setting for the MTC terminal is not set in the MIB (or the MIB spare bit) and / or the SI message, and the information on the setting of the EPDCCH is set in the P-RNTI If no value is set, and the MTC terminal does not support the downlink transmission bandwidth set in the MIB and / or SI message, the MTC terminal assigns to the downlink transmission bandwidth. PDCCH is not monitored from the assigned PDCCH region. Since the MTC terminal cannot monitor the PDCCH with the CRC scrambled by the P-RNTI with an unsupported bandwidth, it cannot detect the PCH.

In such a case, the base station apparatus may not change the system information related to the MTC terminal to the paging information.

In PCell, all signals can be transmitted / received, but in SCell, there are signals that cannot be transmitted / received. For example, PUCCH is transmitted only by PCell. Moreover, PRACH is transmitted only by PCell unless a plurality of TAGs (TimingTiAdvance Group) are set between cells. Moreover, PBCH is transmitted only by PCell. Also, MIB (Master Information Block) is transmitted only by PCell. However, if the terminal device supports the function of transmitting PUCCH or MIB by SCell, the base station device may instruct the terminal device to transmit PUCCH or MIB by SCell. Good. 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. In the PCell, SPS (Semi-Persistent Scheduling) or DRX (Discontinuous Transmission) may be performed. 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, a transmission antenna (base station transmission antenna) 507, a reception antenna (base station reception antenna) 508, an SC-FDMA signal reception unit (CSI reception unit) 509, and an 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.

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.

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 & Coding Scheme) indicating the modulation scheme and coding rate in the downlink, downlink resource allocation indicating 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 higher 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 in 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 the PDCCH or EPDCCH as transmitted in an area where the PDCCH or 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 in advance by the base station apparatus. The downlink subframe processing unit 603 recognizes that the PDCCH or EPDCCH has been detected, and uses the control information included in the detected PDCCH or EPDCCH, if it matches the terminal unique identifier or Temporary C-RNTI) Take out 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 a downlink reference signal 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.

When the MIB includes information related to PDCCH settings for the MTC terminal, the buffer section of the MTC terminal temporarily buffers the information. By receiving SIB (SIB1 and other SI messages) in addition to MIB at the same TTI or different TTI, overflow may occur in the buffer section. When an overflow occurs in the buffer unit, when the SIB does not include information related to the PDCCH setting for the MTC terminal, the MIB system information is held and the SIB system information is flushed. However, if the SIB contains information related to the PDCCH setting for the MTC terminal, if overflow occurs due to receiving the MIB and SIB, the SIB system information is retained and the MIB system information is flushed. To do. If the PCH can be detected based on the information on the PDCCH setting for the MIB or SIB MTC terminal, and the paging information in the PCH does not include the information on the PDCCH setting, the MIB or SIB and the paging information Even if an overflow occurs due to reception of information, the information regarding the PDCCH setting for the MTC terminal included in the MIB or SIB is preferentially held, and the overflowed paging information is flushed. However, if the received paging information includes an SIB change notification including information related to the PDCCH setting for the MTC terminal, the paging information is retained when an overflow occurs due to reception of the MIB and the paging information. And flush the MIB. For example, the buffer unit of the MTC terminal determines the priority order for holding the buffer based on information related to the PDCCH setting for the MTC terminal. In addition, when an overflow occurs, the buffer unit of the MTC terminal may determine the information to be flushed depending on whether or not the parameter related to the setting of the MTC terminal is included.

When an overflow occurs, the buffer unit of the MTC terminal in the idle mode may preferentially hold information related to the setting of the MTC terminal and may flush other information. For example, if the information related to the setting of the MTC terminal is set only for the MIB, the buffer unit may hold the MIB and flush other information that has overflowed. Further, if information related to the setting of the MTC terminal is set only for the SIB, the buffer unit may hold the SIB and flush other information that has overflowed.

When an overflow occurs, the buffer unit of the MTC terminal in the connection mode relates to the setting of the MTC terminal set in the RRC message if information on the setting of the MTC terminal is set in each of the MIB, SIB, and RRC messages. Information may be retained and other information that has overflowed may be flushed. When information related to the setting of the MTC terminal is set only in a specific message, the message may be preferentially held and other information that has overflowed may be flushed.

Regardless of the idle mode and the connection mode, the MTC terminal preferentially holds information related to the PDCCH setting.

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. Further, the control unit 606 sends the HARQ-ACK (DTX (untransmitted), ACK (successful detection), or NACK ( 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. Uplink control information generating section 610 generates PUCCH including the calculated CSI and / or HARQ-ACK. 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.

In the above embodiment, the power value required for each PUSCH transmission is a parameter set by an upper layer, an adjustment value determined by the number of PRBs assigned to the PUSCH transmission by resource assignment, a downlink path loss, and a multiplication thereof. In the above description, it is calculated based on a coefficient to be calculated, 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.

A program that operates in the base station device 2 and the terminal device 1 related to the present invention is a program that controls a CPU (Central Processing Unit) or the like (a computer functions) so as to realize the functions of the above-described embodiments related to the present invention. Program). 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 the terminal device 1 in the embodiment mentioned above, and a part of base station apparatus 2 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 the terminal device 1 or the base station device 2 and includes hardware such as an OS and 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 or 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 serving as a server or a client may be included, which 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.

Also, the base station device 2 in the above-described embodiment can be realized as an aggregate (device group) composed of a plurality of devices. Each of the devices constituting the device group may include a part or all of each function or each functional block of the base station device 2 according to the above-described embodiment. It is only necessary to have each function or each functional block of the base station device 2 as a device group. The terminal device 1 according to the above-described embodiment can also communicate with the base station device as an aggregate.

Further, the base station apparatus 2 in the above-described embodiment may be 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, part or all of the terminal device 1 and the base station device 2 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 1 and the base station device 2 may be individually chipped, or 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. It can also be applied to terminal devices or communication devices such as stationary or non-movable electronic devices such as AV equipment, kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other life 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 transmits a function information indicating that the first function and the second function are supported; A receiving unit that receives a first parameter corresponding to the first function and a second parameter corresponding to the second function via higher layer signaling, wherein the transmitting unit includes the first parameter If the above parameter and the second parameter are set, PUSCH (Physical Uplink Shared Channel) and PUCCH (Physical Uplink Control Channel) are repeatedly transmitted using the same number of subframes.

(2) A terminal apparatus according to an aspect of the present invention is the terminal apparatus described above, and when the PUSCH and the PUCCH are transmitted in the same subframe, the transmission unit sets transmission power for the PUCCH. At this time, it is set using a predetermined power offset.

(3) A terminal apparatus according to an aspect of the present invention is the terminal apparatus described above, and when the PUCCH is not transmitted in the same subframe as the PUSCH, the transmission unit sets transmission power for the PUCCH. Set without using a predetermined power offset.

(4) A base station apparatus according to an aspect of the present invention is a base station apparatus that communicates with a terminal apparatus, and receives function information indicating that the terminal apparatus supports the first function and the second function. In the case of having a receiving unit that receives and a cell that permits access to a terminal device that supports the function information, a first parameter corresponding to the first function and a second parameter corresponding to the second function A transmission unit that transmits parameters using higher layer signaling, and when the transmission unit has a cell that allows access to a terminal device that supports the function information, PUCCH (Physical-Uplink-Control-Channel) A predetermined power offset for is transmitted using higher layer signaling.

(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, the step of transmitting function information indicating that the first function and the second function are supported; Receiving a first parameter corresponding to a first function and a second parameter corresponding to the second function via higher layer signaling; and the first parameter and the second parameter are: If it is set, there is a step of repeatedly transmitting PUSCH (Physical Uplink Shared Channel) and PUCCH (Physical Uplink Control Channel) using the same number of times and the same subframe.

(6) The method according to an aspect of the present invention is the method described above, wherein when the PUSCH and the PUCCH are transmitted in the same subframe, a predetermined power offset is set when setting transmission power for the PUCCH. And, when the PUCCH is not transmitted in the same subframe as the PUSCH, when setting the transmission power for the PUCCH, setting without using a predetermined power offset.

(7) 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 the function information indicating that the terminal device supports the first function and the second function. A first parameter corresponding to the first function and a second parameter corresponding to the second function, when receiving a cell that allows access to a terminal device that supports the function information; Is transmitted using higher layer signaling, and a predetermined power offset for PUCCH (Physical Uplink Control 、 Channel) And transmitting using.

(8) A terminal apparatus according to an aspect of the present invention is a terminal apparatus that communicates with a base station apparatus, a receiving unit that receives a master information block (MIB) and one or more system information blocks (SIB); A transmission unit that transmits function information indicating that the terminal device having the first function is used, and a cell permitted to be accessed by the terminal device having the first function is indicated using the MIB or the SIB. When the MIB or the SI message includes information related to PDCCH (Physical Downlink Control Channel) setting, the receiving unit determines whether the reception unit performs resource allocation based on the information related to the PDCCH setting. Receive PDCCH.

(9) A terminal device according to an aspect of the present invention is the above-described terminal device, wherein the reception unit receives a CRC (Cyclic Redundancy Check) scrambled from the PDCCH by a first RNTI (Radio Network Temporary Identifier). The accompanying DCI (Downlink Control Information) format is detected, and PCH (Paging Channel) is detected based on the resource allocation detected from the DCI format.

(10) A terminal device according to an aspect of the present invention is the terminal device described above, wherein the receiving unit receives the first RNTI using higher layer signaling.

(11) A terminal device according to an aspect of the present invention is the terminal device described above, wherein the reception unit includes a case where the MIB or the SIB does not include information regarding the setting of the PDCCH, and an EPDCCH (Enhanced If the second RNTI for PCH is set in the information regarding the setting of (PDCCH), a DCI format with a CRC scrambled by the second RNTI is detected from the EPDCCH, and the PCH is detected based on the DCI format. Is detected.

(12) A terminal device according to an aspect of the present invention is the above-described terminal device, wherein the reception unit does not include information regarding the setting of the PDCCH in the MIB or the SIB, and the setting of the EPDCCH If the second RNTI for the PCH is not set in the information on the information and the first function information corresponds to the downlink transmission bandwidth included in the MIB or the SIB, the downlink A DCI format with a CRC scrambled by a third RNTI which is a predetermined value is detected from the PDCCH allocated to the link transmission bandwidth, and a PCH is detected based on the DCI format.

(13) A terminal apparatus according to an aspect of the present invention is the terminal apparatus described above, wherein resource allocation based on the setting of the PDCCH is a resource block index corresponding to a downlink transmission bandwidth indicated by the MIB or the SIB. It is represented by

(14) A base station apparatus according to an aspect of the present invention is a base station apparatus that communicates with a terminal apparatus, and when the terminal apparatus indicates that the first function is supported, the first station apparatus A transmission unit that transmits information indicating whether or not there is a cell that permits access to a terminal device that supports the function using higher layer signaling including system information, and the transmission unit supports the first function If there is a cell that permits access to the terminal device, information related to setting of PDCCH (Physical Downlink Control Channel) for the terminal device that supports the first function is set in the master information block or the system information block.

(15) A base station apparatus according to an aspect of the present invention is the base station apparatus described above, wherein the transmission unit is accompanied by a CRC (Cyclic Redundancy Check) scrambled by a first RNTI (Radio Network Temporary Identifier). A DCI (Downlink Control Information) format is transmitted based on the setting of the PDCCH, and the first RNTI is an RNTI of a PCH (PagingＩChannel) for a terminal device that supports the first function.

(16) A method according to an aspect of the present invention is a method in a terminal device that communicates with a base station device, the step of receiving a master information block (MIB), and receiving one or more system information blocks (SIB). And a step of transmitting function information indicating having the first function, and a cell that is permitted to be accessed by the terminal device of the first function using the MIB or the SIB. If the MIB or the SI message includes information related to PDCCH (Physical Downlink Control Channel) setting, the PDCCH is received from the cell based on resource allocation based on the information related to the PDCCH setting. Steps.

(17) A method according to an aspect of the present invention is a method in a base station apparatus that communicates with a terminal device, and when the terminal device indicates that the first function is supported, A step of transmitting information indicating whether or not there is a cell allowing access to a terminal device supporting the function using higher layer signaling including system information; and permitting access to the terminal device supporting the first function If there is a cell to perform, there is a step of setting information relating to setting of PDCCH (Physical Downlink Control Control Channel) for the terminal device supporting the first function in the master information block or the system information block.

(18) A terminal apparatus according to an aspect of the present invention is a terminal apparatus that communicates with a base station apparatus, and a transmission unit that transmits functional information indicating that the first function is supported to the base station apparatus; And a receiving unit that detects an MIB (Master Information Block) from a PBCH (Physical Broadcast Channel), and the receiving unit is permitted to access a terminal device that supports the first function from the base station device. Then, the first information related to the downlink resource allocation for the terminal device supporting at least the first function is detected from the MIB.

(19) A terminal device according to an aspect of the present invention is the above-described terminal device, wherein the receiving unit is configured to perform PDCCH for a terminal device that supports at least the first function based on the first information. (Physical Downlink Control Channel) is received.

(20) A terminal device according to an aspect of the present invention is the above-described terminal device, wherein the reception unit has a CRC (Cyclic Redundancy check) of SI-RNTI (System Information-Radio Network Temporary Identifier) in the PDCCH. If it is scrambled, the system information for the terminal device supporting the first function is detected from PDSCH (Physical Downlink Shared Channel) corresponding to the PDCCH.

(21) A terminal device according to an aspect of the present invention is the terminal device described above, and the value of the SI-RNTI is a default value.

(22) A terminal device according to an aspect of the present invention is the above terminal device, wherein the receiving unit sets a physical channel / physical signal for the terminal device supporting the first function from the system information. Detect information about.

(23) A base station apparatus according to an aspect of the present invention is a base station apparatus that communicates with a terminal apparatus, and is a downlink resource for a terminal apparatus that supports at least a first function in an MIB (Master Information Block). A transmission unit that sets and transmits first information related to allocation is provided, and the transmission unit transmits a PDCCH (Physical-Downlink-Control-Channel) corresponding to the downlink resource allocation.

(24) 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 transmits function information indicating that the first function is supported to the base station apparatus; , If detecting MIB (Master Information Block) from PBCH (Physical Broadcast Channel) and access from the base station device to the terminal device supporting the first function is permitted from the MIB, Detecting at least first information related to downlink resource allocation for a terminal device supporting at least the first function.

(25) 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 a downlink resource for a terminal apparatus that supports at least a first function in an MIB (Master Information Block). A step of setting and transmitting first information related to allocation, and when the downlink resource allocation is set in the MIB, a PDCCH (Physical Downlink Control Control Channel) corresponding to the downlink resource allocation is transmitted. Steps.

(26) A terminal apparatus according to an aspect of the present invention is a terminal apparatus that communicates with a base station apparatus, and supports a first function, and a terminal having a first function in a master information block (MIB) When information related to PDCCH (Physical Downlink Control Control Channel) settings for a device is included, the buffer unit temporarily buffers information related to the PDCCH settings, and the buffer unit receives a system information block (SIB). Thus, if an overflow occurs, information regarding the setting of the PDCCH is preferentially held, and the overflowed SIB is flushed.

(27) A terminal device according to an aspect of the present invention is the terminal device described above, wherein if the buffer unit overflows when receiving paging information, priority is given to information related to the setting of the PDCCH. And flush the overflowed paging information.

(28) A terminal device according to an aspect of the present invention is the terminal device described above, wherein the buffer unit includes the MIB and the SIB when the SIB includes information on the setting of the PDCCH. If overflow occurs due to reception, the MIB is flushed.

(29) A terminal device according to an aspect of the present invention is the terminal device described above, wherein the buffer unit receives paging information for notifying the change of the SIB, and receives the MIB and the paging information. If this causes an overflow, the MIB is flushed.

(30) 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 supports the first function, and the master information block (MIB) has the first function. A step of temporarily buffering information relating to the setting of the PDCCH when information related to setting of PDCCH (Physical Downlink Control Channel) for the terminal device is included, and receiving a system information block (SIB) Therefore, if an overflow occurs, there is a step of preferentially holding information related to the setting of the PDCCH and a step of flushing the overflowed SIB.

(31) A method according to an aspect of the present invention is the method described above, wherein if overflow occurs due to reception of paging information, the step of preferentially holding information regarding the setting of the PDCCH; Flushing the overflowed paging information.

(32) The method according to one aspect of the present invention is the method described above, and when the SIB includes information related to the setting of the PDCCH, overflow occurs by receiving the MIB and the SIB. If so, the method includes a step of flushing the MIB.

(33) The method according to one aspect of the present invention is the method described above, wherein the paging information for notifying the change of the SIB is received, and the overflow occurs due to the reception of the MIB and the paging information. Comprises flushing the MIB.

As described above, 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 generation unit 610 Uplink control information generation units 611 and 612 SC-FDMA signal transmission units 613 and 614 Transmission antenna

Claims (8)

1. A terminal device that communicates with a base station device,
   When the first function is supported and the master information block (MIB) includes information related to the setting of the PDCCH (Physical Downlink Control Channel) for the terminal device having the first function, the PDCCH is temporarily stored. A buffer unit for buffering information about the settings of
   The buffer unit is
   If an overflow occurs by receiving a system information block (SIB),
   Preferentially holds information on the setting of the PDCCH,
   A terminal device that flushes the overflowed SIB.
2. The buffer unit is
   If there is an overflow caused by receiving paging information,
   Preferentially holds information on the setting of the PDCCH,
   The terminal device according to claim 1, wherein overflowed paging information is flushed.
3. The buffer unit is
   When the SIB includes information on the PDCCH configuration,
   If overflow occurs by receiving the MIB and the SIB,
   The terminal device according to claim 1, wherein the MIB is flushed.
4. The buffer unit is
   When paging information for notifying the change of the SIB is received and overflow occurs by receiving the MIB and the paging information,
   The terminal device according to claim 2, wherein the MIB is flushed.
5. A method in a terminal apparatus that communicates with a base station apparatus,
   When the first function is supported and the master information block (MIB) includes information related to the setting of the PDCCH (Physical Downlink Control Channel) for the terminal device having the first function, the PDCCH is temporarily stored. Buffering information about the settings of
   If an overflow occurs by receiving a system information block (SIB),
   Preferentially holding information on the setting of the PDCCH;
   Flushing the overflowed SIB.
6. If there is an overflow caused by receiving paging information,
   Preferentially holding information on the setting of the PDCCH;
   6. The method of claim 5, comprising flushing overflowed paging information.
7. When the SIB includes information on the PDCCH configuration,
   If overflow occurs by receiving the MIB and the SIB,
   The method of claim 5, comprising flushing the MIB.
8. When paging information notifying the change of the SIB is received and overflow occurs by receiving the MIB and the paging information,
   The method of claim 6, comprising flushing the MIB.

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