WO2016111220A1 - Système de communication sans fil, dispositif terminal, dispositif de station de base, procédé de communication sans fil et circuit intégré - Google Patents

Système de communication sans fil, dispositif terminal, dispositif de station de base, procédé de communication sans fil et circuit intégré Download PDF

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WO2016111220A1
WO2016111220A1 PCT/JP2015/086468 JP2015086468W WO2016111220A1 WO 2016111220 A1 WO2016111220 A1 WO 2016111220A1 JP 2015086468 W JP2015086468 W JP 2015086468W WO 2016111220 A1 WO2016111220 A1 WO 2016111220A1
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random access
transmission
channel
base station
station apparatus
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PCT/JP2015/086468
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English (en)
Japanese (ja)
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恭之 加藤
克成 上村
山田　昇平
秀和 坪井
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シャープ株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA

Definitions

  • the present invention relates to a radio communication system, a terminal apparatus, and a base station apparatus, and more particularly to a radio communication system, a base station apparatus, a terminal apparatus, a radio communication method, and an integrated circuit related to machine type communication or inter-machine communication.
  • the W-CDMA system is standardized as a third generation cellular mobile communication system, and services are provided. Also, HSDPA with higher communication speed has been standardized and is being serviced.
  • the third generation wireless access evolution (Long Term Evolution: LTE or Evolved Universal Terrestrial Radio Access: EUTRA) has been standardized, and LTE service has been started.
  • An OFDM (Orthogonal-Frequency-Division-Multiplexing) scheme that is resistant to multipath interference and suitable for high-speed transmission is adopted as an LTE downlink communication scheme.
  • SC-FDMA Single carrier frequency division multiplexing SC-FDMA that can reduce the peak power to average power ratio PAPR (Peak to Average Power Ratio) of the transmission signal.
  • PAPR Peak to Average Power Ratio
  • DFT Discrete Fourier Transform
  • LTE-Advanced (or Advanced-EUTRA), which is a further evolution of LTE.
  • LTE-Advanced it is assumed that communication is performed at a maximum transmission rate of 1 Gbps or more and 500 Mbps or more of the uplink by using a band up to a maximum of 100 MHz bandwidth in the uplink and the downlink.
  • LTE-Advanced it is considered that a maximum of 100 MHz band is realized by bundling a plurality of bands compatible with LTE so that LTE mobile station apparatuses can be accommodated.
  • one band of 20 MHz or less of LTE is called a component carrier (Component (Carrier: CC).
  • the component carrier is also called a cell.
  • bundling a band of 20 MHz or less is called carrier aggregation (Carrier Aggregation: CA) (Non-patent Document 1).
  • Non-Patent Document 2 the MTC / M2M mobile station apparatus or the MTC / M2M communication device is also referred to as MTCUE (Machine Type Communication User Equipment).
  • the transmission / reception bandwidth is narrowed, the number of antenna ports / RF chains is reduced, the transmission / reception data transfer rate is reduced, and the half-duplex frequency division is performed.
  • Cost reduction methods such as adoption of a multiplex (Half-duplex Frequency Division Duplex) method, reduction of transmission / reception power, and extension of intermittent reception intervals have been proposed.
  • reduction of the maximum bandwidth of the transmission / reception RF circuit and transmission / reception baseband circuit of the MTCUE is effective.
  • MTC is not only considering cost reduction, but also studying coverage enhancement for extending the transmission / reception range of MTCUE.
  • the base station apparatus In order to extend the coverage, the base station apparatus repeatedly transmits downlink data or downlink signals to the MTCUE, and the MTCUE repeatedly transmits uplink data or uplink signals to the base station apparatus.
  • Non-patent Document 3 Non-patent Document 3
  • the base station apparatus repeatedly transmits the physical broadcast channel PBCH to the MTCUE multiple times within 40 ms.
  • the MTCUE repeatedly transmits the same random access preamble using a plurality of physical random access channels PRACH. Then, the base station apparatus that has received the random access preamble repeatedly transmits a random access response message. Note that the base station apparatus notifies the MTCUE in the cell using the broadcast channel BCH or notifies each MTCUE individually (Non-patent Document 3).
  • the number of repeated transmissions of the random access preamble or the number of repeated transmissions of the random access response message is notified by the broadcast channel BCH.
  • the number of repeated transmissions of the random access preamble includes a plurality of types of repeated transmissions, and it has been considered that the MTCUE can select one number of repeated transmissions from a plurality of types of repeated transmissions.
  • 3GPP TS Technical Specification 36.300, V11.5.0 (2013-03), Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Universal Terrestrial Radio Access Network (E-UTRAN), Overall description Stage2 3GPP TR (Technical Report) 36.888, V12.0.0 (2013-06), Study on provision of low-cost Machine-Type Communications (MTC) User Equipments (UEs) based on LTE (release 12) “Rel-12 agreements for MTC”, R1-143784, 3GPP TSG-RAN WG1 Meeting # 78bis Ljubljana, Slovenia, 6th-10th October 2014
  • MTC Machine-Type Communications
  • An object is to provide an apparatus, a wireless communication method, and an integrated circuit.
  • the wireless communication system is a wireless communication system in which a base station device communicates with a terminal device, and the base station device receives a repetition level and a random access response corresponding to the repetition level.
  • the terminal device is notified of the value of the window, the terminal device determines the number of repeated transmissions of the random access channel based on the repetition level, and indicates a random access channel response in a random access response window corresponding to the repetition level. Receive access response.
  • the terminal apparatus determines the number of repeated transmissions of the physical uplink shared channel based on the repetition level notified by the received random access response. Also good.
  • a terminal apparatus is a terminal apparatus that communicates with a base station apparatus, and receives a repetition level and a random access response window value corresponding to the repetition level from the base station apparatus. Then, the number of repeated transmissions of the random access channel is determined based on the repetition level, and a random access response indicating a response of the random access channel is received in the random access response window corresponding to the repetition level.
  • the terminal device may determine the number of repeated transmissions of the physical uplink shared channel based on the repetition level notified by the received random access response.
  • a base station apparatus is a base station apparatus that communicates with a terminal apparatus, and notifies the terminal apparatus of a repetition level and a random access response window value corresponding to the repetition level.
  • the random access response indicating the response of the random access channel is transmitted in the random access response window corresponding to the repetition level.
  • a radio communication method is a radio communication method of a radio communication system in which a base station apparatus communicates with a terminal apparatus, and the base station apparatus is set to a repetition level and a repetition level.
  • a step of notifying a terminal device of a value of a corresponding random access response window, wherein the terminal device determines the number of repeated transmissions of the random access channel based on the repetition level, and a random access response corresponding to the repetition level Receiving at least a random access response indicating a response of the random access channel in the window.
  • An integrated circuit is an integrated circuit that is applied to a terminal device that communicates with a base station device, and the random access corresponding to the repetition level and the repetition level from the base station device.
  • An integrated circuit according to a sixth aspect of the present invention is an integrated circuit applied to a base station apparatus that communicates with a terminal apparatus, and includes a repetition level and a value of a random access response window corresponding to the repetition level. And a means for transmitting a random access response indicating a response of the random access channel in a random access response window corresponding to the repetition level.
  • the base station apparatus can perform efficient data scheduling for the mobile station apparatus.
  • the OFDM system is adopted as the downlink of LTE.
  • a single carrier communication scheme of DFT-spread OFDM scheme is adopted as the uplink of LTE.
  • FIG. 3 is a diagram showing a physical channel configuration of LTE.
  • the downlink physical channel includes a physical downlink shared channel PDSCH (Physical Downlink Shared Channel), a physical downlink control channel PDCCH (Physical Downlink Control Channel), and a physical broadcast channel PBCH (Physical Broadcast Channel).
  • PDSCH Physical Downlink Shared Channel
  • PDCCH Physical Downlink Control Channel
  • PBCH Physical Broadcast Channel
  • PBCH Physical Broadcast Channel
  • the uplink physical channel includes a physical random access channel PRACH (Physical Random Access Channel), a physical uplink shared channel PUSCH (Physical Uplink Shared Channel), and a physical uplink control channel PUCCH (Physical Uplink Control Channel).
  • PRACH Physical Random Access Channel
  • PUSCH Physical Uplink Shared Channel
  • PUCCH Physical Uplink Control Channel
  • the uplink reference signal includes a demodulation reference signal (Demodulation Reference Signal: DRS) and a measurement reference signal (Sounding Reference Signal: SRS).
  • the measurement reference signal further includes a periodic measurement reference signal (Periodic SRS) and an aperiodic measurement reference signal (Aperiodic SRS).
  • the measurement reference signal refers to a periodic measurement reference signal (Non-Patent Document 1).
  • FIG. 4 is a diagram illustrating an LTE downlink channel configuration.
  • the downlink channels shown in FIG. 4 are each composed of a logical channel, a transport channel, and a physical channel.
  • the logical channel defines the type of data transmission service that is transmitted and received in a medium access control (MAC) layer.
  • the transport channel defines what characteristics the data transmitted over the air interface has and how it is transmitted.
  • a physical channel is a physical channel that carries data conveyed to the physical layer by a transport channel.
  • the downlink logical channels include broadcast control channel BCCH (Broadcast Control Channel), paging control channel PCCH (Paging Control Channel), common control channel CCCH (Common Control Channel), dedicated control channel DCCH (Dedicated Control Channel), and dedicated traffic.
  • BCCH Broadcast Control Channel
  • PCCH Paging Control Channel
  • CCCH Common Control Channel
  • DCCH dedicated Control Channel
  • a channel DTCH Dedicated Traffic Channel
  • the downlink transport channels include a broadcast channel BCH (Broadcast Channel), a paging channel PCH (Paging Channel), and a downlink shared channel DL-SCH (Downlink Shared Channel).
  • BCH Broadcast Channel
  • PCH paging channel
  • DL-SCH Downlink Shared Channel
  • the downlink physical channels include a physical broadcast channel PBCH (Physical Broadcast Channel), a physical downlink control channel PDCCH (Physical Downlink Control Channel), and a physical downlink shared channel PDSCH (Physical Downlink Shared Channel). These channels are transmitted and received between the base station apparatus and the mobile station apparatus.
  • PBCH Physical Broadcast Channel
  • PDCCH Physical Downlink Control Channel
  • PDSCH Physical Downlink Shared Channel
  • the broadcast control channel BCCH is a downlink channel used for broadcasting system information (System Information).
  • the paging control channel PCCH is a downlink channel used for transmitting paging information, and is used when the network does not know the cell position of the mobile station apparatus.
  • the common control channel CCCH is a channel used for transmitting control information between the mobile station apparatus and the network, and is used by a mobile station apparatus that does not have a radio resource control (RRC) connection with the network. Is done.
  • RRC radio resource control
  • the dedicated control channel DCCH is a one-to-one (point-to-point) bidirectional channel and is a channel used for transmitting individual control information between the mobile station apparatus and the network.
  • the dedicated control channel DCCH is used by a mobile station apparatus having an RRC connection.
  • the dedicated traffic channel DTCH is a one-to-one bidirectional channel, is a channel dedicated to one mobile station apparatus, and is used for transferring user information (unicast data).
  • the broadcast channel BCH is broadcast to the entire cell in a fixed and predefined transmission format.
  • the downlink shared channel DL-SCH supports HARQ (Hybrid Automatic Repeat Request), dynamic adaptive radio link control, and discontinuous reception (DRX: Discontinuous Reception), and is broadcast to the entire cell.
  • HARQ Hybrid Automatic Repeat Request
  • DRX Discontinuous Reception
  • the paging channel PCH supports DRX and needs to be broadcast to the entire cell.
  • the paging channel PCH is mapped to a physical resource that is dynamically used for a traffic channel and other control channels, that is, a physical downlink shared channel PDSCH.
  • the physical broadcast channel PBCH maps the broadcast channel BCH with a period of 40 milliseconds.
  • the physical downlink control channel PDCCH includes radio resource assignment of the physical downlink shared channel PDSCH (downlink assignment), hybrid automatic repeat request (HARQ) information for downlink data, and radio of the physical uplink shared channel PUSCH. It is a channel used to notify the mobile station apparatus of uplink transmission permission (uplink grant) that is resource allocation.
  • the physical downlink shared channel PDSCH is a channel used for transmitting downlink data or paging information.
  • the physical downlink control channel PDCCH is arranged in the 1 to 3 symbol OFDM of the resource block from the head of one subframe, and the physical downlink shared channel PDSCH is arranged in the remaining OFDM symbols.
  • One subframe is composed of two resource blocks, and one frame is composed of 10 subframes.
  • One resource block is composed of 12 subcarriers and 7 OFDM symbols.
  • the base station apparatus when the base station apparatus notifies the mobile station apparatus of radio resource allocation of the physical downlink shared channel PDSCH to the mobile station apparatus using the physical downlink control channel PDCCH, the physical downlink shared channel PDSCH allocated to the mobile station apparatus The region is the physical downlink shared channel PDSCH in the same subframe as the physical downlink control channel PDCCH in which the downlink assignment is notified.
  • mapping between the transport channel and the physical channel is performed as follows. Broadcast channel BCH is mapped to physical broadcast channel PBCH. The paging channel PCH and the downlink shared channel DL-SCH are mapped to the physical downlink shared channel PDSCH. The physical downlink control channel PDCCH is used as a physical channel alone.
  • mapping between logical channels and transport channels is performed as follows.
  • the paging control channel PCCH is mapped to the paging channel PCH.
  • Broadcast control channel BCCH is mapped to broadcast channel BCH and downlink shared channel DL-SCH.
  • the common control channel CCCH, the dedicated control channel DCCH, and the dedicated traffic channel DTCH are mapped to the downlink shared channel DL-SCH.
  • FIG. 5 is a diagram showing an LTE uplink channel configuration.
  • the uplink channels shown in FIG. 5 are each composed of a logical channel, a transport channel, and a physical channel. The definition of each channel is the same as the downlink channel.
  • the uplink logical channels include a common control channel CCCH (Common Control Channel), a dedicated control channel DCCH (Dedicated Control Channel), and a dedicated traffic channel DTCH (Dedicated Traffic Channel).
  • CCCH Common Control Channel
  • DCCH dedicated Control Channel
  • DTCH dedicated Traffic Channel
  • the uplink transport channel includes an uplink shared channel UL-SCH (Uplink Shared Channel) and a random access channel RACH (Random Access Channel).
  • UL-SCH Uplink Shared Channel
  • RACH Random Access Channel
  • the uplink physical channels include a physical uplink control channel PUCCH (Physical Uplink Control Channel), a physical uplink shared channel PUSCH (Physical Uplink Shared Channel) and a physical random access channel PRACH (Physical Random Access Channel). These channels are transmitted and received between the base station apparatus and the mobile station apparatus.
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • PRACH Physical Random Access Channel
  • the common control channel CCCH is a channel used for transmitting control information between the mobile station apparatus and the network, and is used by a mobile station apparatus that does not have a radio resource control (RRC) connection with the network. Is done.
  • RRC radio resource control
  • the dedicated control channel DCCH is a one-to-one (point-to-point) bidirectional channel and is a channel used for transmitting individual control information between the mobile station apparatus and the network.
  • the dedicated control channel DCCH is used by a mobile station apparatus having an RRC connection.
  • the dedicated traffic channel DTCH is a one-to-one bidirectional channel, is a channel dedicated to one mobile station apparatus, and is used for transferring user information (unicast data).
  • the uplink shared channel UL-SCH supports HARQ (Hybrid Automatic Repeat Request), dynamic adaptive radio link control, and discontinuous transmission (DTX). Limited control information is transmitted on the random access channel RACH.
  • HARQ Hybrid Automatic Repeat Request
  • DTX discontinuous transmission
  • the physical uplink control channel PUCCH includes response information (ACK (Acknowledge) / NACK (Negative acknowledge)), downlink radio quality information, and uplink data transmission request (scheduling request: Scheduling Request: SR) for downlink data. )
  • the physical uplink shared channel PUSCH is a channel used for transmitting uplink data.
  • the physical random access channel PRACH is mainly used for random access preamble transmission for acquiring transmission timing information from the mobile station apparatus to the base station apparatus. Random access preamble transmission is performed in a random access procedure.
  • the mapping between the transport channel and the physical channel is performed as follows.
  • the uplink shared channel UL-SCH is mapped to the physical uplink shared channel PUSCH.
  • the random access channel RACH is mapped to the physical random access channel PRACH.
  • the physical uplink control channel PUCCH is used as a physical channel alone.
  • the logical channel and the transport channel are mapped as follows.
  • the common control channel CCCH, the dedicated control channel DCCH, and the dedicated traffic channel DTCH are mapped to the uplink shared channel UL-SCH.
  • FIG. 6 is a protocol stack for handling control data of LTE mobile station apparatuses and base station apparatuses.
  • FIG. 7 is a protocol stack for handling user data of an LTE mobile station apparatus and a base station apparatus. 6 and 7 will be described below.
  • the physical layer provides a transmission service to an upper layer using a physical channel (Physical layer).
  • the PHY layer is connected to an upper medium access control layer (Medium Access Control Layer) via a transport channel.
  • Data moves between the MAC layer, the PHY layer, and the layer (layer) via the transport channel.
  • Data transmission / reception is performed between the mobile station apparatus and the base station apparatus via a physical channel.
  • entities entities that perform roles in each hierarchy.
  • the MAC layer maps various logical channels to various transport channels.
  • the MAC layer is connected to an upper radio link control layer (Radio Link Control Layer: RLC layer) through a logical channel.
  • Logical channels are roughly classified according to the type of information to be transmitted, and are divided into a control channel for transmitting control information and a traffic channel for transmitting user information.
  • the MAC layer has a function of controlling the PHY layer to perform intermittent transmission / reception (DRX / DTX), a function of notifying transmission power information, a function of performing HARQ control, and the like.
  • the MAC layer also notifies the amount of data in the transmission buffer corresponding to each logical channel (buffer Status Report: BSR)), and makes a radio resource request for transmitting uplink data (scheduling) I have a request (Scheduling Request).
  • BSR Buffer Status Report
  • the MAC layer executes a random access procedure when performing an initial access or a scheduling request.
  • the RLC layer divides and concatenates the data received from the upper layer, and adjusts the data size so that the lower layer can transmit data appropriately.
  • the RLC layer also has a function for guaranteeing QoS (Quality of Service) required by each data. That is, the RLC layer has functions such as data retransmission control.
  • the packet data convergence protocol layer (Packet Data Convergence Protocol layer: PDCP layer) has a header compression function that compresses unnecessary control information in order to efficiently transmit IP packets as user data in a wireless section.
  • the PDCP layer also has a data encryption function.
  • the radio resource control layer defines only control information.
  • the RRC layer sets and resets a radio bearer (RB) and controls a logical channel, a transport channel, and a physical channel.
  • the RB is divided into a signaling radio bearer (Signaling Radio Bearer: SRB) and a data radio bearer (Data Radio Bearer: DRB), and the SRB is used as a path for transmitting an RRC message as control information.
  • DRB is used as a route for transmitting user information.
  • Each RB is set between the RRC layers of the base station apparatus and the mobile station apparatus.
  • the PHY layer corresponds to the first physical layer in the hierarchical structure of the generally known Open Systems Interconnection (OSI) model, and the MAC layer, RLC layer, and PDCP layer are OSI.
  • the RRC layer corresponds to the data link layer, which is the second layer of the model, and the network layer, which is the third layer of the OSI model.
  • Random access procedures include two access procedures: Contention-based Random Access procedure (contention-based random access procedure) and Non-contention-based Random access procedure (non-contention-based random access procedure) (Non-patent Document 1).
  • FIG. 8 is a diagram showing the Contention-based Random Access procedure.
  • the Contention based Random Access procedure is a random access that may compete (collision) between mobile station devices, and the Contention based Random Access procedure is for the initial access from a state that is not connected (communication) with the base station device. This is performed for a scheduling request or the like when uplink data transmission is generated in the mobile station device while being connected to the base station device but being out of uplink synchronization.
  • FIG. 9 is a diagram showing a Non-contention based Random Access procedure.
  • Non-contention based Random Access procedure is a random access that does not cause contention between mobile station devices, and moves quickly when the base station device and the mobile station device are connected but the uplink is out of synchronization.
  • the mobile station device performs random access when instructed by the base station device in a special case such as when handover or the transmission timing of the mobile station device is not effective.
  • Start Non-Patent Document 1).
  • the Non-contention based Random Access procedure is instructed by an RRC (Radio Resource Control: Layer 3) layer message and control data of the physical downlink control channel PDCCH.
  • RRC Radio Resource Control: Layer 3
  • the mobile station apparatus 1-1 transmits a random access preamble to the base station apparatus 5 (message 1: (1), step S1).
  • the base station device 5 that has received the random access preamble transmits a response to the random access preamble (random access response message) to the mobile station device 1-1 (message 2: (2), step S2).
  • the mobile station device 1-1 transmits an upper layer (Layer2 / Layer3) message based on the scheduling information included in the random access response message (message 3: (3), step S3).
  • the base station apparatus 5 transmits a contention confirmation message to the mobile station apparatus 1-1 that has received the upper layer message of (3) (message 4: (4), step S4).
  • Contention based Random Access is also referred to as random preamble transmission.
  • the base station apparatus 5 notifies the mobile station apparatus 1-1 of the preamble number (or sequence number) and the random access channel number to be used (message 0: (1 '), step S11).
  • the mobile station apparatus 1-1 transmits the random access preamble having the designated preamble number to the designated random access channel RACH (message 1: (2 '), step S12).
  • the base station device 5 that has received the random access preamble transmits a response to the random access preamble (random access response message) to the mobile station device 1-1 (message 2: (3 '), step S13).
  • the ContentionContentbased Random Access is performed.
  • Non-contention based Random Access is also called dedicated preamble transmission.
  • the mobile station apparatus 1-1 acquires system information of the base station apparatus 5 from the physical broadcast channel PBCH and the like, executes a random access procedure from random access related information included in the system information, and Connect.
  • the mobile station apparatus 1-1 generates a random access preamble from the random access related information in the system information.
  • the mobile station apparatus 1-1 transmits a random access preamble using the random access channel RACH (message 1: (1)).
  • the base station device 5 When the base station device 5 detects the random access preamble from the mobile station device 1-1, the base station device 5 calculates a transmission timing shift amount between the mobile station device 1-1 and the base station device 5 from the random access preamble, and (L2) / Layer3 (L3) scheduling (uplink radio resource position (position of physical uplink shared channel PUSCH), transmission format (message size), etc.) to transmit a message, Temporary C-RNTI (Cell -Radio Network Temporary Identity: mobile station apparatus identification information) and a response (random access response message) addressed to the mobile station apparatus 1-1 that has transmitted the random access preamble of the random access channel RACH to the physical downlink control channel PDCCH RA-RNTI (Random Access-Radio Network Temporary Identity) indicating the transmission timing information, scheduling information, Temporary C-RNTI, and received random access preamble on the physical downlink shared channel PDSCH.
  • a random access response message including information is transmitted (message 2: (2)).
  • the mobile station apparatus 1-1 When the mobile station apparatus 1-1 detects that the physical downlink control channel PDCCH has RA-RNTI, the mobile station apparatus 1-1 confirms the contents of the random access response message arranged in the physical downlink shared channel PDSCH and transmits the transmitted random access preamble. Information is included, the uplink transmission timing is adjusted from the transmission timing information, and C-RNTI (or Temporary C-RNTI) or IMSI (International Mobile Subscriber Identity) is used in the scheduled radio resource and transmission format. The L2 / L3 message including information for identifying the mobile station device 1-1 is transmitted (message 3: (3)).
  • the mobile station device 1-1 starts the transmission timing timer when adjusting the transmission timing. While the transmission timing timer is operating (or running), the transmission timing is valid, and when the transmission timing timer expires or is stopped, the transmission timing is invalid. While the transmission timing is valid, the mobile station apparatus 1-1 can transmit data to the base station apparatus 5, and when the transmission timing is invalid, the mobile station apparatus 1-1 can only transmit a random access preamble. It is. In addition, a period in which the transmission timing is valid is referred to as an uplink synchronization state, and a period in which the transmission timing is not valid is also referred to as an uplink asynchronous state.
  • the base station apparatus 5 When the base station apparatus 5 receives the L2 / L3 message from the mobile station apparatus 1-1, the base station apparatus 5 uses the C-RNTI (or Temporary C-RNTI) or IMSI included in the received L2 / L3 message.
  • the mobile station apparatus 1-1 When the mobile station apparatus 1-1 transmits an L2 / L3 message, it starts a contention resolution timer. When the mobile station device 1-1 receives the contention confirmation message while the contention resolution timer is operating, the mobile station device 1-1 ends the random access procedure.
  • the mobile station apparatus 1-1 If the mobile station apparatus 1-1 does not detect the random access response message including the preamble number corresponding to the random access preamble transmitted in the random access response reception period (Random
  • the mobile station apparatus 1-1 determines that the random access has failed and performs communication with the base station apparatus 5. Disconnect. After the random access procedure is successful, control data for connection is further exchanged between the base station apparatus 5 and the mobile station apparatus 1-1. At this time, the base station apparatus 5 notifies the mobile station apparatus 1-1 of the uplink reference signal to be individually allocated and the allocation information of the physical uplink control channel PUCCH.
  • the uplink transmission timing after completion of the random access procedure is updated by the uplink reference signal (measurement reference signal or demodulation signal) transmitted from the mobile station apparatus 1-1 by the base station apparatus 5.
  • (Reference signal) is measured, the transmission timing is calculated, and a transmission timing message including the calculated transmission timing information is notified to the mobile station apparatus 1-1.
  • the mobile station apparatus 1-1 updates the transmission timing indicated by the transmission timing message notified from the base station apparatus 5, the mobile station apparatus 1-1 restarts the transmission timing timer.
  • the base station apparatus 5 also holds the same transmission timing timer as that of the mobile station apparatus 1-1.
  • the transmission timing timer is started or restarted. In this way, the base station apparatus 5 and the mobile station apparatus 1-1 manage the uplink synchronization state. Note that the transmission timing is invalid when the transmission timing timer expires or when the transmission timing timer is not operating.
  • LTE-Advanced for further evolution of LTE.
  • LTE-Advanced it is assumed that communication at a maximum transmission rate of 1 Gbps or more and uplink 500 Mbps or more is performed using a bandwidth up to a maximum of 100 MHz bandwidth in the uplink and downlink.
  • LTE-Advanced is considering realizing a maximum of 100 MHz band by bundling a plurality of LTE bands of 20 MHz or less so that LTE mobile station apparatuses can be accommodated.
  • one band of 20 MHz or less of LTE is called a component carrier (Component (Carrier: CC) (Non-Patent Document 1).
  • one cell is configured by combining one downlink component carrier and one uplink component carrier.
  • a single cell can be configured with only one downlink component carrier. Bundling a plurality of cells and performing communication between the base station apparatus and the mobile station apparatus via the plurality of cells is called carrier aggregation.
  • One base station apparatus allocates a plurality of cells that match the communication capability and communication conditions of the mobile station apparatus, and communicates with the mobile station apparatus via the allocated plurality of cells.
  • the plurality of cells allocated to the mobile station apparatus are one cell as a first cell (Primary cell (Primary Cell: PCell)) and the other cells as second cells (Secondary cell (Secondary Cell: SCell)). And classified.
  • a special function such as allocation of the physical uplink control channel PUCCH is set in the first cell.
  • the transmission / reception bandwidth is narrowed, the number of antenna ports / RF chains is reduced, the transmission / reception data transfer rate is reduced, and the half-duplex frequency division is performed.
  • Cost reduction methods such as adoption of a multiplex (Half-duplex Frequency Division Duplex) method, reduction of transmission / reception power, and extension of intermittent reception intervals have been proposed.
  • reduction of the maximum bandwidth of the transmission / reception RF circuit and transmission / reception baseband circuit of the MTCUE is effective.
  • downlink data or downlink signals are repeatedly transmitted to MTCUE for one data transmission, and MTCUE is transmitted once. It is considered that uplink data or an uplink signal is repeatedly transmitted to the base station apparatus in response to the data transmission.
  • the base station apparatus In order to reduce transmission / reception power and expand coverage, the base station apparatus repeatedly transmits downlink data or downlink signals to MTCUE for one data transmission, and MTCUE performs one data transmission. On the other hand, it is considered that uplink data or an uplink signal is repeatedly transmitted to the base station apparatus.
  • MTCUE repeatedly receives data from the base station apparatus for one data reception, adds the repeatedly received data, and demodulates the data. Also, the base station apparatus repeatedly receives data from the MTCUE, adds the repeatedly received data, and demodulates the data.
  • the base station apparatus repeatedly transmits the physical broadcast channel PBCH to the MTCUE multiple times within 40 ms. Further, the base station apparatus repeatedly transmits the physical downlink shared channel PDSCH, the physical downlink control channel PDCCH, and the extended physical control channel EPDCCH (enhanced Physical Downlink Control Channel) to the MTCUE a plurality of times. The MTCUE repeatedly transmits the physical uplink shared channel PUSCH, the physical uplink control channel PUCCH, and the like to the base station apparatus a plurality of times.
  • PBCH physical broadcast channel
  • the base station apparatus repeatedly transmits the physical downlink shared channel PDSCH, the physical downlink control channel PDCCH, and the extended physical control channel EPDCCH (enhanced Physical Downlink Control Channel) to the MTCUE a plurality of times.
  • EPDCCH enhanced Physical Downlink Control Channel
  • the MTCUE In the random access procedure, the MTCUE repeatedly transmits the same random access preamble using a plurality of physical random access channels PRACH. Then, the base station apparatus that has received the random access preamble repeatedly transmits a random access response message. In addition, the message 3 and the conflict confirmation message are repeatedly transmitted. Note that the base station apparatus notifies the MTCUE in the cell of the number of repeated transmissions and receptions using the broadcast channel BCH, or notifies each MTCUE individually (Non-patent Document 3).
  • the number of repeated transmissions of the random access preamble or the number of repeated receptions of the random access response message is reported on the broadcast channel BCH.
  • the number of repeated transmissions of the random access preamble includes a plurality of types of repeated transmissions, and it has been considered that the MTCUE can select one number of repeated transmissions from a plurality of types of repeated transmissions.
  • the number of repeated transmissions set from the base station apparatus is also referred to as one trial number (attempt).
  • Repetitive control for reception of the physical downlink control channel PDCCH, reception of the extended physical control channel EPDCCH, transmission of the physical uplink control channel PUCCH and transmission of the physical random access channel PRACH (or random access preamble) is referred to as repetition.
  • the repetitive control for the reception of the physical downlink shared channel PDSCH and the transmission of the physical uplink shared channel PUSCH is also referred to as bundling.
  • the bundle size defines the number of subframes for one bundle. Bundling operations rely on HARQ entities that invoke the same HARQ process for each transmission that makes up the same bundle. Within one bundle, HARQ retransmissions are non-adaptive and are triggered without waiting for feedback from previous transmissions depending on the bundle size.
  • the HARQ feedback of one bundle is received (HARQ-ACK for PUSCH) or transmitted (HARQ-ACK for PDSCH) by the terminal device only for the last subframe of the bundle.
  • the bundling process is performed in the MAC layer.
  • MTC Machine Type Communication
  • M2M Machine To Machine
  • MTCUE Machine Type Communication User Equipment
  • the use of such a mobile station apparatus is not limited to machine type communication or communication between machines.
  • a mobile station apparatus that does not have features such as cost reduction and coverage expansion is simply shown as a mobile station apparatus below.
  • FIG. 1 is a diagram illustrating a configuration of an MTCUE according to an embodiment of the present invention.
  • the MTCUEs 3-1 to 3-3 include a data generation unit 101, a transmission data storage unit 103, a transmission HARQ processing unit 105, a transmission processing unit 107, a radio unit 109, a reception processing unit 111, a reception HARQ processing unit 113, and a MAC information extraction unit.
  • the data generation unit 101 has functions of a PDCP layer and an RLC layer.
  • the data generation unit 101 performs processing such as header compression of the IP packet of user data, data encryption, data division and combination, and adjusts the data size.
  • the data generation unit 101 outputs the processed data to the transmission data storage unit 103.
  • the transmission data storage unit 103 accumulates the data input from the data generation unit 101, and outputs the instructed data to the transmission HARQ processing unit 105 by the instructed data amount based on the instruction from the MAC control unit 119. . In addition, the transmission data storage unit 103 outputs information on the amount of accumulated data to the MAC control unit 119.
  • the transmission HARQ processing unit 105 encodes input data and performs puncture processing on the encoded data. Then, transmission HARQ processing section 105 outputs the punctured data to transmission processing section 107, and stores the encoded data. When instructed by the MAC control unit 119 to retransmit data, the transmission HARQ processing unit 105 performs puncture processing different from the puncture performed last time from the stored (buffered) encoded data, and performs puncturing. The processed data is output to the transmission processing unit 107. When the transmission HARQ processing unit 105 is instructed to delete data from the MAC control unit 119, the transmission HARQ processing unit 105 deletes data corresponding to the designated cell.
  • the transmission processing unit 107 modulates and encodes the data input from the transmission HARQ processing unit 105.
  • the transmission processing unit 107 performs DFT (Discrete Fourier Transform (Discrete Fourier Transform))-IFFT (Inverse Fast Fourier Transform (Inverse Fast Fourier Transform)) processing of the modulated and encoded data, and after processing, CP (Cyclic prefix) Is inserted into the physical uplink shared channel (PUSCH) of each uplink component carrier (cell) and output to the radio section 109.
  • DFT Discrete Fourier Transform
  • IFFT Inverse Fast Fourier Transform
  • CP Cyclic prefix
  • the transmission processing unit 107 when there is a response instruction for received data from the PHY control unit 117, the transmission processing unit 107 generates an ACK or NACK signal, places the generated signal in the physical uplink control channel (PUCCH), and transmits the radio unit 109. Output to.
  • the transmission processing unit 107 When there is a random access preamble transmission instruction from the PHY control unit 117, the transmission processing unit 107 generates a random access preamble, places the generated signal in the physical random access channel PRACH, and outputs the generated signal to the radio unit 109.
  • the radio unit 109 up-converts the data input from the transmission processing unit 107 to the radio frequency of the transmission position information (transmission cell information) instructed from the PHY control unit 117, adjusts the transmission power, and converts the data from the transmission antenna Send.
  • Radio section 109 down-converts the radio signal received from the reception antenna and outputs the result to reception processing section 111.
  • Radio section 109 sets the transmission timing information received from PHY control section 117 as the uplink transmission timing.
  • the reception processing unit 111 performs FFT (Fast Fourier Transform) processing, decoding, demodulation processing, and the like on the signal input from the wireless unit 109.
  • FFT Fast Fourier Transform
  • the reception processing unit 111 demodulates the physical downlink control channel PDCCH or the extended physical downlink control channel EPDCCH and detects the downlink allocation information of the own mobile station apparatus, the reception processing unit 111 determines the physical downlink based on the downlink allocation information.
  • the shared channel PDSCH is demodulated and the fact that downlink allocation information has been acquired is output to the MAC control unit 119.
  • the reception processing unit 111 outputs the demodulated physical downlink shared channel PDSCH data to the reception HARQ processing unit 113.
  • the reception processing unit 111 demodulates the physical downlink control channel PDCCH or the extended physical downlink control channel EPDCCH, uplink transmission permission information (Uplink grant: uplink grant), and uplink transmission data response information (ACK / NACK) ) Is detected, the acquired response information is output to the MAC control unit 119.
  • the uplink transmission permission information includes data modulation / coding scheme, data size information, HARQ information, transmission position information, and the like.
  • the reception HARQ processing unit 113 performs a decoding process on the input data from the reception processing unit 111, and outputs the data to the MAC information extraction unit 115 when the decoding process is successful.
  • the reception HARQ processing unit 113 stores the data that has failed in the decoding process when the decoding process of the input data has failed.
  • the reception HARQ processing unit 113 When receiving the retransmission data, the reception HARQ processing unit 113 combines the stored data and the retransmission data and performs a decoding process. Further, the reception HARQ processing unit 113 notifies the MAC control unit 119 of success or failure of the input data decoding process.
  • the MAC information extraction unit 115 extracts the control data of the MAC layer (Medium Access Access Control layer) from the data input from the reception HARQ processing unit 113, and outputs the extracted MAC control information to the MAC control unit 119.
  • the MAC information extraction unit 115 outputs the remaining data to the data processing unit 121.
  • the data processing unit 121 has functions of a PDCP layer and an RLC layer, and performs processing such as decompression (decompression) function of compressed IP header, decryption function of encrypted data, data division and combination, and data Return to its original shape.
  • the data processing unit 121 divides the RRC message and user data, outputs the RRC message to the RRC control unit 123, and outputs the user data to the upper layer.
  • the PHY control unit 117 controls the transmission processing unit 107, the radio unit 109, and the reception processing unit 111 according to an instruction from the MAC control unit 119.
  • the PHY control unit 117 notifies the transmission processing unit 107 of the modulation / coding method notified from the MAC control unit 119 and the transmission power information to the transmission processing unit 107, and transmits the frequency information and transmission power information of the transmission cell to the radio unit. 109 is notified.
  • the PHY control unit 117 performs power supply (power supply) ON / OFF control of the transmission processing unit 107, the radio unit 109, and the reception processing unit 111 according to an instruction from the MAC control unit 119.
  • ON / OFF control refers to power saving control including reducing power supply to standby power.
  • the PHY control unit 117 controls the transmission processing unit 107 and the reception processing unit 111 based on the number of times of repeated transmission / reception notified from the RRC control unit 123.
  • the MAC control unit 119 has a MAC layer function, and controls the MAC layer based on information acquired from the RRC control unit 123 or a lower layer.
  • the MAC control unit 119 performs data transmission priority based on the data transmission control setting specified from the RRC control unit 123, the data amount information acquired from the transmission data storage unit 103, and the uplink transmission permission information acquired from the reception processing unit 111. The order is determined, and the transmission data storage unit 103 is notified of information regarding data to be transmitted. Further, the MAC control unit 119 notifies the transmission HARQ processing unit 105 of HARQ information, and outputs the modulation / coding scheme to the PHY control unit 117.
  • the MAC control unit 119 obtains response information for the uplink transmission data from the reception processing unit 111, and when the response information indicates NACK (non-response), retransmits to the transmission HARQ processing unit 105 and the PHY control unit 117. Instruct.
  • the MAC control unit 119 instructs the PHY control unit 117 to transmit an ACK or NACK signal.
  • the MAC control unit 119 acquires discontinuous reception (DRX) control information from the MAC control information input from the MAC information extraction unit 115, the wireless control unit 109, the transmission processing unit 107, and the reception unit perform intermittent reception control.
  • the PHY control unit 117 is controlled.
  • the MAC control unit 119 executes a random access procedure.
  • the MAC control unit 119 performs processing such as selection of a random access preamble, reception processing of a random access response message, management of a contention resolution timer, and the like.
  • the MAC control unit 119 instructs to erase data stored in the transmission HARQ processing unit 105.
  • the MAC control unit 119 notifies the RRC control unit 123 to release the radio resources of the physical uplink control channel PUCCH and the uplink measurement reference signal. Further, the MAC control unit 119 discards the uplink transmission permission information.
  • the MAC control unit 119 manages repetitive transmission / reception control using the repetitive control timer information acquired from the RRC control unit 123.
  • the MAC control unit 119 acquires control information instructing to start or restart the repeated control timer from the MAC control information input from the MAC information extracting unit 115, the MAC control unit 119 starts or restarts the repeated control timer. Then, the MAC control unit 119 notifies the RRC control unit 123 that the control timer has expired.
  • the RRC control unit 123 may manage the repetitive control timer.
  • the MAC control unit 119 creates a buffer status report (BSR) that is data amount information stored in the transmission data storage unit 103 and outputs the buffer status report (BSR) to the transmission data storage unit 103. Further, the MAC control unit 119 creates a power headroom report (Power Headroom Report: PHR) that is transmission power information, and outputs it to the transmission data storage unit 103.
  • BSR buffer status report
  • PHR power headroom Report
  • the RRC control unit 123 performs various settings for communicating with the base station apparatus 5 such as connection / disconnection processing with the base station apparatus 5, data transmission control settings for control data and user data, and the like.
  • the RRC control unit 123 exchanges information with an upper layer associated with various settings, and controls a lower layer associated with the various settings.
  • the RRC control unit 123 creates an RRC message and outputs the created RRC message to the data generation unit 101.
  • the RRC control unit 123 analyzes the RRC message input from the data processing unit 121.
  • the RRC control unit 123 creates a message indicating the transmission capability of the own MTCUE and outputs the message to the data generation unit 101. Further, the RRC control unit 123 outputs information necessary for the MAC layer to the MAC control unit 119 and outputs information necessary for the physical layer to the PHY control unit 117.
  • the RRC control unit 123 When the RRC control unit 123 acquires the transmission timing timer information, the RRC control unit 123 outputs the transmission timing timer information to the MAC control unit 119.
  • the RRC control unit 123 When the RRC control unit 123 is notified of the release of the physical uplink control channel PUCCH or the uplink measurement reference signal from the MAC control unit 119, the RRC control unit 123 displays the allocated physical uplink control channel PUCCH and the uplink measurement reference signal.
  • the PHY control unit 117 is instructed to release the physical uplink control channel PUCCH and the uplink measurement reference signal.
  • the RRC control unit 123 When the RRC control unit 123 acquires the repeated transmission / reception control message, the RRC control unit 123 outputs the repeated transmission / reception count and the repeated control timer information to the MAC control unit 119 and the PHY control unit 117. When the repetitive control timer expires, the RRC control unit 123 notifies the MAC control unit 119 and the PHY control unit 117 of one or the maximum number of repetitive transmission / receptions.
  • the transmission processing unit 107, the radio unit 109, the reception processing unit 111, and the PHY control unit 117 perform operations of the physical layer, and transmit data storage unit 103, transmission HARQ processing unit 105, reception HARQ processing unit 113, MAC information extraction.
  • 115 and MAC control unit 119 operate in the MAC layer
  • data generation unit 101 and data processing unit 121 operate in the RLC layer and PDCP layer
  • RRC control unit 123 operates in the RRC layer.
  • FIG. 2 is a diagram showing a configuration of the base station apparatus according to the embodiment of the present invention.
  • the base station device 5 includes a data generation unit 201, a transmission data storage unit 203, a transmission HARQ processing unit 205, a transmission processing unit 207, a radio unit 209, a reception processing unit 211, a reception HARQ processing unit 213, a MAC information extraction unit 215, and a PHY control. 217, MAC controller 219, data processor 221, and RRC controller 223.
  • the data generation unit 201 has functions of a PDCP layer and an RLC layer, and performs processing such as header compression of the IP packet of user data, data encryption, data division and combination, and adjusts the data size.
  • the data generation unit 201 outputs the processed data and the logical channel information of the data to the transmission data storage unit 203.
  • the transmission data storage unit 203 accumulates the data input from the data generation unit 201 for each user, and transmits the user data instructed based on the instruction from the MAC control unit 219 for the specified data amount. The data is output to the unit 205. Also, the transmission data storage unit 203 outputs information on the amount of accumulated data to the MAC control unit 219.
  • the transmission HARQ processing unit 205 encodes input data and performs puncture processing on the encoded data. Then, the transmission HARQ processing unit 205 outputs the punctured data to the transmission processing unit 207, and stores the encoded data. The transmission HARQ processing unit 205, when instructed to retransmit data from the MAC control unit 219, performs a puncture process different from the previously performed puncture from the stored encoded data, and transmits the punctured data to the transmission processing unit 207. Output to.
  • the transmission processing unit 207 modulates and encodes the data input from the transmission HARQ processing unit 205.
  • the transmission processing unit 207 maps the modulated and encoded data to signals such as physical downlink control channel PDCCH, downlink synchronization signal, physical broadcast channel PBCH, physical downlink shared channel PDSCH and the like of each cell,
  • the mapped data is subjected to OFDM signal processing such as serial / parallel conversion, IFFT (Inverse Fourier Transform (Inverse Fast Fourier Transform)) conversion, and CP insertion to generate an OFDM signal.
  • OFDM signal processing such as serial / parallel conversion, IFFT (Inverse Fourier Transform (Inverse Fast Fourier Transform)) conversion, and CP insertion to generate an OFDM signal.
  • the transmission processing unit 207 outputs the generated OFDM signal to the wireless unit 209.
  • the transmission processing unit 207 when there is a response instruction for received data from the MAC control unit 219, the transmission processing unit 207 generates an ACK or NACK signal, places the generated signal in the physical downlink control channel PDCCH, and outputs it to the radio unit 209. To do.
  • the radio unit 209 up-converts data input from the transmission processing unit 207 to a radio frequency, adjusts transmission power, and transmits data from the transmission antenna.
  • the radio unit 209 down-converts the radio signal received from the reception antenna and outputs it to the reception processing unit 211.
  • the reception processing unit 211 performs FFT (Fast Fourier Transform (fast Fourier transform)) processing, decoding, demodulation processing, and the like on the signal input from the wireless unit 209.
  • FFT Fast Fourier Transform
  • the reception processing unit 211 outputs the data of the physical uplink shared channel PUSCH among the demodulated data to the reception HARQ processing unit 213. Further, the reception processing unit 211 receives response information (ACK / NACK), downlink radio quality information (CQI), and uplink radio quality information (CQI) of control data acquired from the physical uplink control channel PUCCH among the demodulated data. Transmission request information (scheduling request) is output to the MAC control unit 219. Also, the reception processing unit 211 calculates uplink radio quality from the uplink measurement reference signal of the MTCUE 3-1, and outputs the uplink radio quality information to the RRC control unit 223 and the MAC control unit 219.
  • the reception processing unit 211 calculates a transmission timing from the detected random access preamble, and outputs the detected random access preamble number and the calculated transmission timing to the MAC control unit 219.
  • the reception processing unit 211 calculates transmission timing from the uplink reference signal, and outputs the calculated transmission timing to the MAC control unit 219.
  • the reception HARQ processing unit 213 performs a decoding process on the input data from the reception processing unit 211 and outputs the data to the MAC information extraction unit 215 when the decoding process is successful.
  • the reception HARQ processing unit 213 stores the data that has failed in the decoding process when the decoding process of the input data has failed.
  • the reception HARQ processing unit 213 combines the stored data and the retransmission data and performs a decoding process. Also, the reception HARQ processing unit 213 notifies the MAC control unit 219 of the success or failure of the input data decoding process.
  • the reception HARQ processing unit 213 erases data corresponding to the designated cell when instructed to erase data from the MAC control unit 219.
  • the MAC information extraction unit 215 extracts the MAC layer control data from the data input from the reception HARQ processing unit 213, and outputs the extracted control information to the MAC control unit 219.
  • the MAC information extraction unit 215 outputs the remaining data to the data processing unit 221.
  • the data processing unit 221 has functions of a PDCP layer and an RLC layer, performs a decompression (decompression) function of a compressed IP header, a decryption function of encrypted data, a process of dividing and combining data, and the like. Return to its original shape.
  • the data processing unit 221 divides the RRC message and user data, outputs the RRC message to the RRC control unit 223, and outputs the user data to the upper layer.
  • the MAC control unit 219 has a MAC layer function, and controls the MAC layer based on information acquired from the RRC control unit 223 and lower layers.
  • the MAC control unit 219 performs downlink and uplink scheduling processing.
  • the MAC control unit 219 receives downlink transmission data response information (ACK / NACK), downlink radio quality information (CQI), uplink radio quality information, and uplink transmission request information (scheduling request) input from the reception processing unit 211. ) Based on the control information input from the MAC information extraction unit 215 and the data amount information for each user acquired from the transmission data storage unit 203, the number of repeated transmissions and receptions, and the reception operation state of the MTCUE 3-1, the downlink and uplink Performs scheduling processing. The MAC control unit 219 outputs the schedule result to the transmission processing unit 207. Further, the MAC control unit 219 determines the reception operation state of the MTCUE 3-1 from the intermittent reception parameter acquired from the RRC control unit 223.
  • the MAC control unit 219 acquires response information for the uplink transmission data from the reception processing unit 211, and resends to the transmission HARQ processing unit 205 and the transmission processing unit 207 when the response information indicates NACK (non-response). Instruct.
  • the MAC control unit 219 instructs the transmission processing unit 207 to transmit an ACK or NACK signal.
  • the MAC control unit 219 When acquiring the random access preamble number and the transmission timing from the reception processing unit 211, the MAC control unit 219 creates a random access response message and outputs the random access response message to the transmission data storage unit 203. Further, when acquiring the transmission timing from the reception processing unit 211, the MAC control unit 219 creates a transmission timing message including the transmission timing, and outputs the transmission timing message to the transmission data storage unit 203.
  • the MAC control unit 219 determines whether it is an MTCUE or a mobile station device based on the random access preamble number notified from the reception processing unit 211. Then, it is determined whether repeated transmission or repeated reception is necessary for transmission of the random access response message, transmission of the contention resolution, and reception of the message 3, and transmission of the random access response message, transmission of the contention resolution, and message 3 Scheduling reception of
  • the MAC control unit 219 manages uplink transmission timing.
  • the MAC control unit 219 manages the uplink transmission timing of the transmission timing group of the MTCUE 3-1 using the transmission timing timer.
  • the MAC control unit 219 transmits a transmission timing message to the MTCUE 3-1, the MAC control unit 219 starts or restarts the transmission timing timer.
  • the MAC control unit 219 instructs the reception HARQ processing unit 213 to erase the data stored in the MTCUE 3-1.
  • the MAC control unit 219 notifies the RRC control unit 223 to release the radio resources of the physical uplink control channel PUCCH and the uplink measurement reference signal allocated to the MTCUE 3-1. Also, the MAC control unit 219 stops uplink data scheduling for the MTCUE 3-1.
  • the MAC control unit 219 controls repetitive transmission / reception using the repetitive control timer acquired from the RRC control unit 223.
  • the MAC control unit 219 creates control information instructing to start or restart the repeated control timer.
  • the MAC control unit 219 starts or restarts the repeated control timer when the control information instructing to start or restart the repeated control timer is transmitted.
  • the RRC control unit 223 performs various settings for communication with the MTCUE 3-1, such as connection / disconnection processing with the MTCUE 3-1, data transmission control setting for which cell to transmit / receive control data and user data of the MTCUE 3-1, and so on. And exchanges information with an upper layer associated with the various settings, and controls a lower layer associated with the various settings.
  • the RRC control unit 223 creates various RRC messages and outputs the created RRC messages to the data generation unit 201.
  • the RRC control unit 223 analyzes the RRC message input from the data processing unit 221.
  • the RRC control unit 223 creates a message including system information.
  • the RRC control unit 223 may create a message including system information for the MTCUE 3-1 and a message including system information for the mobile station apparatus 1-1.
  • the RRC control unit 223 sets information on the number of repeated transmissions / receptions (the number of repeated receptions and the number of repeated transmissions) based on the measurement report message from the MTCUE 3-1 and / or the uplink radio quality information from the reception processing unit 211. That is, the RRC control unit 223 repeats the reception times of the physical downlink shared channel PDSCH, the physical downlink control channel PDCCH, and the extended physical control channel EPDCCH, and the repeated transmission times of the physical uplink shared channel PUSCH and the physical uplink control channel PUCCH. Is set for each MTCUE 3-1. The repeated transmission / reception times may be set for each uplink and downlink, or may be set for each physical channel. Further, the RRC control unit 223 sets a repeat control timer for the MTCUE 3-1.
  • the RRC control unit 223 creates a repeated transmission / reception control message including one or both of the repeated transmission / reception count and the repeated control timer, and outputs the repeated transmission / reception control message to the transmission data storage unit 203. Further, the RRC control unit 223 notifies the MAC control unit 219 and the PHY control unit 217 of the number of repeated receptions, the number of repeated transmissions, and the repetition control timer set for the MTCUE 3-1.
  • the repeated transmission / reception control message may be, for example, an RRC reconfiguration message or a new RRC message.
  • the RRC control unit 223 outputs information necessary for the MAC layer to the MAC control unit 219, and outputs information necessary for the physical layer to the PHY control unit 217.
  • the RRC control unit 223 displays the allocated physical uplink control channel PUCCH and the uplink measurement reference signal.
  • the PHY control unit 217 is instructed to release the physical uplink control channel PUCCH and the uplink measurement reference signal.
  • the transmission processing unit 207, the radio unit 209, and the reception processing unit 211 perform operations of the PHY layer, and transmit data storage unit 203, transmission HARQ processing unit 205, reception HARQ processing unit 213, MAC information extraction unit 215, MAC control.
  • the unit 219 performs operations of the MAC layer
  • the data generation unit 201 and the data processing unit 221 perform operations of the RLC layer and the PDCP layer
  • the RRC control unit 223 performs operations of the RRC layer.
  • the base station device 5 communicates with the MTCUEs 3-1, 3-2, and 3-3 or the mobile station devices 1-1, 1-2, and 1-3.
  • the operation of MTCUE 3-1 and base station apparatus 5 will be described.
  • the MTCUE 3-1 performs cell search and finds one cell of the base station apparatus 5.
  • the MTCUE 3-1 receives the cell physical broadcast channel PBCH and the like, and acquires system information (cell physical channel configuration, transmission power information, information related to the random access procedure, transmission timing timer information, etc.).
  • the information related to the random access procedure includes random access channel setting information including random physical access channel PRACH arrangement information and random access preamble generation information, random access preamble selection information, random access preamble transmission power information, random access preamble information, and random access preamble transmission power information.
  • Random access common setting information including information related to access response message reception, information related to message 3 transmission, and information related to contention resolution message reception.
  • the selection information of the random access preamble may include selection range information of the random access preamble corresponding to the number of repeated transmissions of the random access preamble. Also, a plurality of information related to random access response message reception corresponding to the number of repeated transmissions of the random access preamble, information related to message 3 transmission, and information related to contention resolution message reception may be configured.
  • the base station apparatus 5 may divide system information into system information notified to the MTCUE 3-1 and system information notified to the mobile station apparatus 1-1. Further, the base station apparatus 5 may set different contents depending on the contents of the system information notified to the MTCUE 3-1 and the contents of the system information notified to the mobile station apparatus 1-1. For example, the base station apparatus 5 informs the mobile station apparatus 1-1 of the conventional system information System Information Block Type 1 (System Information Block Type1). Further, the base station apparatus 5 may notify the MTCUE 3-1 of the new system information System Information Block Type 1A (System Information Block Type1A).
  • the MTCUE 3-1 uses the random access preamble selection information to select a random access preamble used by the MTCUE 3-1. For example, the MTCUE 3-1 may select the number of repeated transmissions of the random access preamble and the random access preamble from the selection range information of the random access preamble based on the downlink radio quality and the like.
  • the maximum number of repeated transmissions may be set for each cell according to system information. Then, the MTCUE 3-1 transmits a random access preamble using the resources of the physical random access channel PRACH of the cell for initial access. The random access preamble is transmitted with the same transmission power until the number of repeated transmissions of random access preamble transmission is reached.
  • the number of repeated transmissions of random access preamble transmission may be included in the random access common information. Further, the number of repeated transmissions of random access preamble transmission may be set in correspondence with the random access preamble selected by MTCUE 3-1.
  • the selection information of the random access preamble may be composed of information on the random access preamble selected by the mobile station apparatus and information on the random access preamble selected by the MTCUE 3-1.
  • the base station device 5 After detecting the random access preamble, the base station device 5 calculates the uplink transmission timing of the MTCUE 3-1 from the received random access preamble, creates a random access response message including the transmission timing information, and transmits the random access response message
  • the included physical downlink shared channel PDSCH is repeatedly transmitted.
  • the base station apparatus 5 may include the number of repeated transmissions for the MTCUE 3-1 in the random access response message.
  • the MTCUE 3-1 receives the random access response message after transmitting the random access preamble, and uses the RA-RNTI (Random Access-Radio Network Temporary Identity :) on the physical downlink control channel PDCCH or the extended physical downlink control channel EPDCCH. Random access response identification information) is monitored during the random access response reception period (Random Access Response window).
  • RA-RNTI Random Access-Radio Network Temporary Identity :
  • Random access response identification information is monitored during the random access response reception period (Random Access Response window).
  • the MTCUE 3-1 When the MTCUE 3-1 detects the RA-RNTI in the physical downlink control channel PDCCH or the extended physical downlink control channel EPDCCH, the MTCUE 3-1 receives the physical downlink shared channel PDSCH including the random access response message. Alternatively, the MTCUE 3-1 may attempt to receive the physical downlink shared channel PDSCH transmitted in the downlink resource region corresponding to the transmitted random access preamble or physical random access channel resource (arrangement information).
  • the MTCUE 3-1 When the MTCUE 3-1 acquires the random access response message, the MTCUE 3-1 sets the transmission timing information included in the random access response message as the uplink transmission timing of the cell, and starts the transmission timing timer. The MTCUE 3-1 repeatedly transmits the message 3 to the base station apparatus 5 through the cell. The MTCUE 3-1 includes the content indicating the initial access in the message 3. When information regarding the number of repeated transmissions to the MTCUE 3-1 is set in the random access response message, the MTCUE 3-1 repeatedly transmits the message 3 until the number of repeated transmissions set in the random access response message is reached.
  • MTCUE3-1 When MTCUE3-1 sends message 3, it starts a contention resolution timer.
  • the MTCUE 3-1 sets the expiration value (setting value) of the contention resolution timer according to the number of transmission repetitions of the random access preamble. Note that the contention resolution timer is started by the first transmission of the repeated transmission of the message 3. Alternatively, the contention resolution timer may be started at the last transmission of the repeated transmission of the message 3.
  • the base station apparatus 5 When receiving the message 3, the base station apparatus 5 repeatedly transmits a contention resolution message to the MTCUE 3-1. Then, when the MTCUE 3-1 receives the contention resolution message from the base station apparatus 5, the MTCUE 3-1 ends the random access procedure.
  • the MTCUE 3-1 repeatedly receives a random access response message and a contention resolution message.
  • the MTCUE 3-1 transmits the message 3 repeatedly.
  • the base station apparatus 5 repeatedly transmits a random access response message and a contention resolution message.
  • the base station apparatus 5 receives the message 3 repeatedly.
  • the number of repeated transmissions or the number of repeated receptions related to the random access procedure may be set in correspondence with the random access preamble transmitted by the MTCUE 3-1. Further, the number of repeated transmissions or the number of repeated receptions related to the random access procedure may be notified by the random access common information of the system information.
  • the number of repeated receptions of the random access response message may be included in the information related to reception of the random access response message. Further, the number of times contention resolution is repeatedly received may be included in the information related to contention resolution message reception.
  • the expiration value of the contention resolution timer may be set in accordance with the number of repeated transmissions of the random access preamble or the number of repeated receptions of the random access response message. That is, the MTCUE 3-1 may have a plurality of expiration values for the contention resolution timer corresponding to the number of repeated transmissions of the random access preamble or the number of repeated receptions of the random access response message.
  • the expiration value of the contention resolution timer may be notified by the system information. For example, when the number of transmission repetitions of the random access preamble can be selected from three types of 5, 10, and 20, the expiration value of the contention resolution timer is a value corresponding to the number of transmission repetitions, for example, 100 ms, Settings that can be selected uniquely or arbitrarily from three types of 200 ms and 400 ms may be set. Further, for example, the value of the contention resolution timer may be uniquely set based on a calculation formula corresponding to the number of transmission repetitions of the selected random access preamble or a repetition level.
  • the base station apparatus 5 may notify the MTCUE 3-1 of expiration values of a plurality of types of contention resolution timers according to the number of repeated transmissions of the random access preamble as in the above example. Further, the base station apparatus 5 notifies the MTCUE 3-1 of the expiration value of the basic contention resolution timer. The MTCUE 3-1 may calculate the expiration value of the contention resolution timer from the expiration value of the basic contention resolution timer and the number of transmission repetitions of the random access preamble.
  • the MTCUE 3-1 may calculate the expiration value of the contention resolution timer from the expiration value of the basic contention resolution timer and the number of repetitions of contention reception.
  • the expiration value of the contention resolution timer may be included in the information related to contention resolution message reception.
  • the MTCUE 3-1 may calculate the reception period in accordance with the number of transmission repetitions of the random access preamble, similarly to the expiration value of the contention resolution timer, for the random access response reception period. Further, the random access response reception period may be set such that a plurality of types can be selected in accordance with the number of times of repeated transmission of the access preamble, similarly to the expiration value of the contention resolution timer. The random access response reception period may be included in the information related to the random access response message reception.
  • the MTCUE 3-1 randomly accesses the random access procedure. Redo from the preamble selection.
  • data transmission / reception is performed between the base station apparatus 5 and the MTCUE 3-1 using the physical downlink shared channel PDSCH and the physical uplink shared channel PUSCH.
  • the base station apparatus 5 and the MTCUE 3-1 perform transmission / reception by repeating the physical downlink shared channel PDSCH and the physical uplink shared channel PUSCH.
  • the number of repeated transmissions of the physical uplink shared channel PUSCH or the number of repeated receptions of the physical downlink shared channel PDSCH after finishing the random access procedure may be set in correspondence with the random access preamble. Further, the number of repeated transmissions or the number of repeated receptions after the end of the random access procedure may be notified to the MTCUE 3-1 in the system information.
  • the base station apparatus 5 may set the number of repeated transmissions or the number of repeated receptions individually for the MTCUE 3-1. The number of repeated transmissions or the number of repeated receptions may be set separately or may be set simultaneously. The base station apparatus 5 may set the number of repetitions of the physical downlink control channel PDCCH, the extended physical downlink control channel EPDCCH, and the physical uplink control channel PUCCH.
  • the base station apparatus 5 reports the radio quality measurement report (measurement report) of its own cell and neighboring cells of the notified MTCUE 3-1, the CQI notified from the MTCUE 3-1, or the uplink reference signal transmitted from the MTCUE 3-1. Based on the radio quality of (SRS), the number of repeated transmissions or the number of repeated receptions of the physical downlink shared channel PDSCH and / or the physical uplink shared channel PUSCH may be determined / changed. For example, the base station apparatus 5 may be set to increase the number of repetitions when the wireless quality deteriorates and to decrease the number of repetitions when the wireless quality improves.
  • SRS radio quality measurement report
  • the base station apparatus 5 may set the valid period of the number of repeated transmissions of the physical uplink shared channel PUSCH or the number of repeated receptions of the physical downlink shared channel PDSCH.
  • the effective period of the repeated transmission count or the repeated reception count may be controlled between the base station apparatus 5 and the MTCUE 3-1 using a timer.
  • the MTCUE 3-1 and the base station apparatus 5 may each have a timer indicating the effective period of the repeated transmission count and a timer indicating the effective period of the repeated reception count. This timer is referred to as a repetitive control timer and is shown below.
  • the base station apparatus 5 notifies the MTCUE 3-1 of the number of times of repeated transmission of the physical uplink shared channel PUSCH or the number of times of repeated reception of the physical downlink shared channel PDSCH, and information on the repetition control timer (for example, the repetition control timer) The expiration value).
  • the MTCUE 3-1 sets the number of repeated transmissions of the physical uplink shared channel PUSCH and the number of repeated receptions of the physical downlink shared channel PDSCH, and starts a repeated control timer.
  • the MTCUE 3-1 While the repeat control timer is running (running), the MTCUE 3-1 transmits the physical uplink shared channel PUSCH or receives the physical downlink shared channel PDSCH with the number of repetitions set by the base station apparatus 5.
  • the MTCUE 3-1 discards (or deletes, releases, invalidates) the repetitive number set individually from the base station apparatus 5, and performs physical uplink
  • the number of repeated transmissions of the control channel PUCCH and the physical uplink shared channel PUSCH is set to a predetermined level, and the number of repeated receptions of the physical downlink control channel PDCCH, the extended physical control channel EPDCCH, and the physical downlink shared channel PDSCH is predetermined. Set to the size of the number of times.
  • the predetermined number of times is, for example, a default value, a value set by the base station apparatus 5 using system information or an RRC message, a maximum number of repetitions supported by the cell, or an initial value.
  • the initial value may be notified by system information or may be determined in advance.
  • the MTCUE 3-1 repeats the number of physical uplink shared channel PUSCH transmissions or physical downlink shared channel PDSCH repetitions. Reset the number of receptions and restart the control timer repeatedly.
  • the base station apparatus 5 may separately notify the MTCUE 3-1 of information indicating the start or restart of the repetitive control timer.
  • the MTCUE 3-1 receives information indicating the start of the repetition control timer, the MTCUE 3-1 starts or restarts the repetition control timer and applies the set number of repetitions. Further, the base station apparatus 5 may separately notify the MTCUE 3-1 of information indicating that the repeated control timer is stopped.
  • the base station apparatus 5 uses the RRC layer message or the MAC layer message to set the MTCUE3-1 as the repeat transmission count of the physical uplink shared channel PUSCH, the repeat reception count of the physical downlink shared channel PDSCH, or the repeat control timer setting information. And the base station apparatus 5 notifies the information indicating the start or restart of the repetitive control timer by a MAC layer control message.
  • the repeat control timer may be started upon reception of a random access response message or a contention resolution message. Further, the repetition control timer may be started by transmission of the message 3. In the case of starting the repetitive control timer by such a random access procedure message, it is desirable that the repetitive control timer is notified to the MTCUE 3-1 by system information.
  • the MTCUE 3-1 may notify the base station device 5 that the repeated control timer has expired. For example, when the repetitive control timer expires, the MTCUE 3-1 executes a random access procedure. The MTCUE 3-1 repeatedly transmits to the base station apparatus 5 including information indicating the expiration of the control timer in the message 3. When the base station apparatus 5 receives information indicating that the repeated control timer has expired, the base station apparatus 5 resets the number of repeated transmissions and receptions in the MTCUE 3-1.
  • the repeat control timer may reuse the transmission timing timer. For example, when the MTCUE 3-1 receives the transmission timing information and restarts the transmission timing timer, if the number of repeated transmission / receptions is notified, application of the notified number of repeated transmission / receptions is started. When the repetition count is not notified, the MTCUE 3-1 continues the set repetition count. When the transmission timing timer expires, the MTCUE 3-1 stops uplink transmission and discards the applied repeated transmission / reception times.
  • the physical uplink shared channel PUSCH, physical downlink shared channel PDSCH, physical uplink control channel PUCCH, physical downlink control channel PDCCH, extended physical downlink control channel EPDCCH, and physical random access channel PRACH shown above are MTCUE
  • the dedicated physical uplink shared channel PUSCH, physical downlink shared channel PDSCH, physical uplink control channel PUCCH, physical downlink control channel PDCCH, extended physical downlink control channel EPDCCH, and physical random access channel PRACH may be used.
  • the base station apparatus 5 may set a plurality of repetition counts and set a repetition level (Repetition Level) or bundling size (Bundling Size) corresponding to each. For example, when the repetition level is 1, the number of repetitions is set to 10, and when the repetition level is 2, the number of repetitions is set to 20, and when the repetition level is 3, the number of repetitions is set to 30. .
  • the base station device 5 may notify the MTCUE 3-1 of the repetition level or bundling size. Further, the MTCUE 3-1 may calculate the expiration value of the repetition control timer, the expiration value of the contention resolution timer, or the random access response reception period based on the repetition level or bundling size.
  • the base station apparatus 5 is a system in which the MTCUE 3-1 receives the above-described parameters such as the repetition level, bundling size, expiration value of the repetition control timer, and the expiration value of the contention resolution timer corresponding to the repetition level. You may make it include in the system information alert
  • the base station apparatus 5 periodically transmits system information at the RRC level.
  • the HARQ process is performed in the MAC layer of the MTCUE 3-1.
  • the iterative control for the reception of the physical downlink control channel PDCCH, the reception of the extended physical control channel EPDCCH, the transmission of the physical uplink control channel PUCCH and the transmission of the physical random access channel PRACH (or random access preamble) is performed by the MTCUE 3-1. This is done in the PHY layer.
  • MTCUE may be classified according to the type of mobile station apparatus.
  • the mobile station apparatus is classified into two types, and the mobile station apparatus that performs the operation of the mobile station apparatus 1-1 is classified as the first type mobile station apparatus, and the mobile station apparatus that performs the operation of the MTCUE3-1. May be classified into the second type. Further, the mobile station apparatus is divided into two types, and the mobile station apparatus that operates the mobile station apparatus 1-1 is classified as the first type mobile station apparatus, and the mobile station apparatus that performs the operation of the MTCUE 3-1 described above.
  • the mobile station apparatuses to which different repetition counts are set may be classified into the second type and the third type, respectively.
  • first type mobile station apparatus is classified into categories 0 to 13 and the second type mobile station apparatus is a category X other than the category indicated by the first type mobile station apparatus.
  • the third type mobile station apparatus may be classified into a category Y other than the categories indicated by the first type and second type mobile station apparatuses.
  • the mobile station device corresponding to the machine type communication is described as an example of the terminal device or the communication device, but the present invention is not limited to this, and is a stationary type installed indoors or outdoors, or non- Needless to say, it can be applied to terminal devices or communication devices such as movable electronic devices such as AV equipment, kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other life equipment.
  • terminal devices or communication devices such as movable electronic devices such as AV equipment, kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other life equipment.
  • the MTCUE 3-1 and the base station apparatus 5 of the embodiment have been described using functional block diagrams, but the functions of each part of the MTCUE 3-1 and the base station apparatus 5 or a part of these functions are described.
  • the mobile station apparatus and the base station apparatus may be controlled by recording a program for realizing on a computer-readable recording medium, causing the computer system to read and execute the program recorded on the recording medium.
  • the “computer system” here includes an OS and hardware such as peripheral devices.
  • the “computer-readable recording medium” means a storage device such as a flexible disk, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system.
  • the “computer-readable recording medium” means that a program is dynamically held for a short time, like 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, it is intended to include those that hold a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client in that case.
  • 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. .
  • each functional block used in each of the above embodiments may be realized as an LSI that is typically an integrated circuit.
  • Each functional block may be individually formed into chips, or a part or all of them may be integrated into a chip.
  • the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
  • an integrated circuit based on the technology can also be used.
  • Some aspects of the present invention provide a wireless communication system, a terminal device, a base station device, and a wireless communication device that require a terminal device that supports machine type communication connected to the base station device to perform transmission and reception control by efficient repetition.
  • the present invention can be applied to communication methods and integrated circuits.
  • Base station apparatus 101 Base station apparatus 101, 201 Data generation unit 103, 203 Transmission data storage unit 105, 205 Transmission HARQ processing unit 107, 207 Transmission processing unit 109, 209 Radio unit 111, 211 Reception processing unit 113, 213 Reception HARQ processing unit 115, 215 MAC information extraction unit 117, 217 PHY control unit 119, 219 MAC control unit 121, 221 Data processing unit 123, 223 RRC control unit

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Dans un système de communication sans fil selon la présente invention, un dispositif de station de base établit une communication avec un dispositif terminal. Le dispositif de station de base notifie au dispositif terminal un niveau de répétition et une valeur de fenêtre de réponse d'accès aléatoire correspondant au niveau de répétition et le dispositif terminal détermine le nombre de transmissions d'un canal d'accès aléatoire répété sur la base du niveau de répétition et reçoit une réponse d'accès aléatoire indiquant une réponse du canal d'accès aléatoire dans une fenêtre de réponse d'accès aléatoire qui correspond au niveau de répétition.
PCT/JP2015/086468 2015-01-08 2015-12-28 Système de communication sans fil, dispositif terminal, dispositif de station de base, procédé de communication sans fil et circuit intégré WO2016111220A1 (fr)

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JP2019531027A (ja) * 2017-01-26 2019-10-24 エルジー エレクトロニクス インコーポレイティド システム情報を要求する方法及び装置
CN113711683A (zh) * 2019-02-15 2021-11-26 株式会社Ntt都科摩 用户终端以及无线通信方法
CN113711683B (zh) * 2019-02-15 2024-05-24 株式会社Ntt都科摩 终端、基站、系统以及无线通信方法

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JP2019531027A (ja) * 2017-01-26 2019-10-24 エルジー エレクトロニクス インコーポレイティド システム情報を要求する方法及び装置
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