WO2016159372A1 - 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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Publication number
WO2016159372A1
WO2016159372A1 PCT/JP2016/060966 JP2016060966W WO2016159372A1 WO 2016159372 A1 WO2016159372 A1 WO 2016159372A1 JP 2016060966 W JP2016060966 W JP 2016060966W WO 2016159372 A1 WO2016159372 A1 WO 2016159372A1
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random access
transmission
information
level
repetition level
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PCT/JP2016/060966
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English (en)
Japanese (ja)
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恭之 加藤
山田　昇平
克成 上村
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, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface

Definitions

  • the present invention relates to a radio communication system, a terminal device, and a base station device, and more specifically, a radio communication system, a base station device, a terminal device, a radio communication method, and an integrated circuit technology related to machine type communication or inter-machine communication.
  • a radio communication system a radio communication system, a base station device, a terminal device, a radio communication method, and an integrated circuit technology 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).
  • MTC Machine Type Communication
  • M2M Machine To Machine Communication
  • 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
  • transmission control by repetition (or reception control by repetition) needs to be correctly managed between the terminal apparatus and the base station apparatus. For example, if a difference in the number of repetitions occurs between the terminal device and the base station device, reception may not be possible in either device.
  • the present invention relates to a wireless communication system, a base station device, a terminal device, a wireless communication method, and an integrated circuit for efficiently performing transmission and reception repeatedly by the terminal device and the base station device.
  • a radio communication system is a radio communication system in which a base station apparatus and a terminal apparatus communicate with each other, and the terminal apparatus selects a level including the number of repetitions for each level and a threshold for path loss.
  • a level including the number of repetitions for each level and a threshold for path loss.
  • select a level from downlink path loss set a parameter corresponding to the level, select a preamble group based on the level, and the base station A level is selected from the above, a parameter corresponding to the level is set, and it is assumed that a preamble group is selected based on the level, and a random access preamble reception process is performed.
  • a terminal device is a terminal device that communicates with a base station device, receives information for selecting a level including a repetition count and a path loss threshold for each level, and A level is selected from the path loss of the link, a parameter corresponding to the level is set, and a preamble group is selected based on the level.
  • a base station apparatus is a base station apparatus that performs communication with a terminal apparatus and executes a random access procedure, and selects a level including a repetition count and a path loss threshold for each level.
  • the terminal device selects a level from the downlink path loss, sets a parameter corresponding to the level, and selects a preamble group based on the level, and performs a random access preamble reception process. Do.
  • a radio communication method is a radio communication method applied to a terminal apparatus that communicates with a base station apparatus and executes a random access procedure, and includes the number of repetitions and path loss for each level.
  • Information for selecting a level including a threshold is received, a level is selected from downlink path loss, a parameter corresponding to the level is set, and a preamble group is selected based on the level.
  • a radio communication method is a radio communication method applied to a base station apparatus that communicates with a terminal device and executes a random access procedure, and includes the number of repetitions and path loss for each level. Notifying the information for selecting a level including a threshold, assuming that the terminal device selects a level from downlink path loss, sets a parameter corresponding to the level, and selects a preamble group based on the level, Random access preamble reception processing is performed.
  • a random access procedure using efficient repeated transmission / reception control can be performed in a terminal device. Further, the base station apparatus can perform efficient data scheduling for the terminal 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. 7 is a diagram showing an LTE physical channel configuration.
  • 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
  • there are physical signals such as downlink synchronization signals and downlink reference signals (Non-Patent Document 1).
  • 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. 8 is a diagram illustrating an LTE downlink channel configuration.
  • the downlink channels shown in FIG. 8 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. 9 is a diagram showing an LTE uplink channel configuration.
  • the uplink channels shown in FIG. 9 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 (transmission timing command) 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. 10 is a protocol stack for handling control data of LTE mobile station apparatuses and base station apparatuses.
  • FIG. 11 is a protocol stack for handling user data of LTE mobile station apparatuses and base station apparatuses. 10 and 11 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. 12 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. 13 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
  • PDCCHorder random access instruction
  • 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 apparatus 1-1 transmits an upper layer (Layer2 / Layer3) message based on the uplink transmission permission information (Uplink grant: uplink grant) included in the random access response message (Message 3: ( 3), Step S3).
  • the base station apparatus 5 transmits a contention resolution message (contention resolution) 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 ) Indicating RA-RNTI (Random Access-Radio Network Temporary Identity: random access response identification information), transmission timing information, uplink transmission permission information, Temporary C-RNTI and received random in physical downlink shared channel PDSCH A random access response message including access preamble information is transmitted (message 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 the 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. If the mobile station apparatus 1-1 receives a contention resolution message while the contention resolution timer is operating, the mobile station apparatus 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 radio link failure (radio link failure) and reestablishes the connection. Process. 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 base station apparatus 5 For updating the uplink transmission timing after the random access procedure is completed, the base station apparatus 5 measures the uplink reference signal (the measurement reference signal or the demodulation reference signal) transmitted from the mobile station apparatus 1-1. Thus, 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 uplink reference signal the measurement reference signal or the demodulation reference signal
  • 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.
  • MTC Machine Type Communication
  • M2M Machine To Machine
  • 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.
  • 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. Message 3 and contention resolution are also transmitted repeatedly. 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 repetitions of random access preamble transmission is reported on the broadcast channel BCH.
  • the number of repetitions of random access preamble transmission includes a plurality of types of repetition transmissions, and it has been studied that the MTCUE can select one number of repetitions of transmission from a plurality of types of repetition transmissions.
  • One repeated transmission is also referred to as one trial.
  • Repetition 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 repeated or repeated.
  • the repeat control for reception of the physical downlink shared channel PDSCH and transmission of the physical uplink shared channel PUSCH is also called bundling or bundling control.
  • 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. Note that the transmission processing unit 107 repeatedly performs transmission processing based on an instruction from the PHY control 117.
  • 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 transmits 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 device
  • the reception processing unit 111 determines the physical downlink shared channel based on the downlink allocation information.
  • PDSCH demodulation is performed, and the fact that downlink allocation information has been acquired is output to the MAC controller 119.
  • the reception processing unit 111 outputs the demodulated physical downlink shared channel PDSCH data to the reception HARQ processing unit 113. Further, 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 processing unit 111 repeatedly performs reception processing based on an instruction from the PHY control 117.
  • 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 information of the MAC layer (Medium Access Control Layer) from the data input from the reception HARQ processing unit 113, and outputs the extracted MAC control information (MAC Control Control Element) to the MAC control unit 119. To do.
  • 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 from the modulation / coding scheme and transmission power information notified from the MAC control unit 119 and notifies the radio unit 109 of the transmission power information.
  • the PHY control unit 117 when the PHY control unit 117 is notified of the PDSCH / PUSCH repetition level or the repetition count from the MAC control unit 119, the PHY control unit 117 repeatedly performs transmission or reception at the repetition count based on the notified PDSCH / PUSCH repetition level. Thus, the transmission processing unit 107 and the reception processing unit 111 are controlled.
  • the PHY control unit 117 when the PHY control unit 117 is notified of the PRACH repetition level or the number of repetitions from the MAC control unit 119, the PHY control unit 117 repeats the random access preamble transmission or the random access response with the number of repetitions based on the notified PRACH repetition level.
  • the transmission processing unit 107 and the reception processing unit 111 are controlled so that reception is repeated.
  • 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 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 notifies the PHY control unit 117 of information necessary for random access preamble transmission, random access response message reception, message 3 transmission, and contention resolution reception.
  • the MAC control unit 119 acquires transmission timing timer information from the RRC control unit 123.
  • the MAC control unit 119 manages validity / invalidity of uplink transmission timing using a transmission timing timer.
  • the MAC control unit 119 outputs transmission timing information (transmission timing command) included in the transmission timing message among the MAC control information input from the MAC information extraction unit 115 to the PHY control unit 117.
  • transmission timing is applied, the MAC control unit 119 starts or restarts the transmission timing timer.
  • 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 performs repetition control using the repetition level timer acquired from the RRC control unit 123.
  • the MAC control unit 119 acquires information indicating the PDSCH / PUSCH repetition level (PDSCH / PUSCH repetition level command) from the MAC control information input from the MAC information extraction unit 115, the MAC control unit 119 sends the PDSCH / PUSCH to the PHY control unit 117. Notify the repetition level and start or restart the repetition level timer.
  • the MAC control unit 119 sets the PDSCH / PUSCH repetition level to a default value. Note that the MAC control unit 119 may notify the RRC control unit 123 that the repetition level timer has expired.
  • 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 communication with the base station device 5 such as connection establishment (connection establishment) / connection release (connection release) with the base station device 5, data transmission control setting of control data and user data, and the like. Do.
  • 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 system information is acquired, the RRC control unit 123 outputs necessary information to the MAC control unit 119 and the PHY control unit 117.
  • 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 acquires the system information for MTCUE, the RRC control unit 123 sets a repetition mode (bundling mode, repeated transmission / reception mode). In the case of MTCUE, the repetition mode may be set.
  • the RRC control unit 123 When the RRC control unit 123 acquires information related to PDSCH / PUSCH repetition, the RRC control unit 123 outputs the repetition transmission count and repetition level timer information corresponding to the repetition level to the MAC control unit 119 and the PHY control unit 117.
  • 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 / coded data to signals such as the physical downlink control channel PDCCH, the downlink synchronization signal, the physical broadcast channel PBCH, and the physical downlink shared channel PDSCH, and the mapped data.
  • signals such as the physical downlink control channel PDCCH, the downlink synchronization signal, the physical broadcast channel PBCH, and the physical downlink shared channel PDSCH, and the mapped data.
  • OFDM signal processing such as serial / parallel conversion, IFFT (Inverse Fourier Transform) conversion, CP insertion, and the like 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 transmission processing unit 207 also performs repeated transmission processing based on an instruction from the PHY control 217.
  • 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) processing, decoding, demodulation processing, and the like on the signal input from the wireless unit 209.
  • the reception processing unit 211 repeatedly performs reception processing based on an instruction from the PHY control 217.
  • 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 performs a random access preamble detection process with the number of repetitions instructed from the PHY control unit 217.
  • the reception processing unit 211 detects a random access preamble, it calculates 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 PHY control unit 217 controls the transmission processing unit 207, the radio unit 209, and the reception processing unit 211 according to an instruction from the MAC control unit 219.
  • the PHY control unit 217 notifies the transmission processing unit 207 of the modulation / coding method from the modulation / coding scheme and transmission power information notified from the MAC control unit 219 and notifies the radio unit 209 of the transmission power information.
  • the PHY control unit 217 notifies the reception processing unit 211 of information necessary for the random access preamble reception process from information related to the random access procedure.
  • the PHY control unit 217 when the PHY control unit 217 is notified of the PDSCH / PUSCH repetition level or the number of repetitions from the MAC control unit 219, the PHY control unit 217 performs transmission so as to perform repeated transmission or reception with the number of repetitions based on the notified repetition level.
  • the processing unit 207 and the reception processing unit 211 are controlled.
  • 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.
  • the random access response message may include a PDSCH / PUSCH repetition level command.
  • 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 MTCUE 3-1 using a 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 transmission / reception repeatedly using a repetition level timer acquired from the RRC control unit 223. For example, the MAC control unit 219 determines the PDSCH / PUSCH repetition level based on the uplink radio quality information from the reception processing unit 211 or the downlink radio quality information (eg, CQI, RSRP, RSRQ) notified from the MTCUE 3-1. And creates MAC control information including PDSCH / PUSCH repetition level or information indicating the PDSCH / PUSCH bundling size (hereinafter referred to as PDSCH / PUSCH repetition level command), and PDSCH / PUSCH repetition level command. Is output to the transmission data storage unit 203.
  • the MAC control unit 219 determines the PDSCH / PUSCH repetition level based on the uplink radio quality information from the reception processing unit 211 or the downlink radio quality information (eg, CQI, RSRP, RSRQ) notified from the MTCUE 3-1. And create
  • the MAC control unit 219 receives the PDSCH / PUSCH repetition level command, the MTCUE 3-1 receives the PDSCH / PUSCH repetition level command, or the PDSCH / PUSCH repetition level command from the MTCUE 3-1.
  • ACK acknowledgment
  • the repetition level timer is started or restarted.
  • the MAC control unit 219 notifies the PHY control unit 219 of a new PDSCH / PUSCH repetition level.
  • the MAC control unit 219 may create MAC control information for instructing the start or restart of the repetition level timer and notify the MTCUE 3-1. Note that, when the repetition level timer expires, the MAC control unit 219 may notify the RRC control unit 223 that the repetition level timer has expired.
  • the PDSCH / PUSCH repetition level may be managed by the RRC control unit 223.
  • the RRC control unit 223 performs communication with the MTCUE 3-1 such as connection establishment (connection establishment) / connection release (connection release) processing with the MTCUE 3-1, data transmission control setting for control data and user data of the MTCUE 3-1, etc.
  • connection establishment connection establishment
  • connection release connection release
  • Various settings are performed, information is exchanged with an upper layer according to the various settings, and lower layers are controlled according to 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. Note that the RRC control unit 223 may separately 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 notifies the PHY control unit 217 and the MAC control unit 219 of information related to the random access procedure included in the system information.
  • the RRC control unit 223 creates a message including information on the PDSCH / PUSCH repetition level and outputs the message to the transmission data storage unit 203.
  • the information on the PDSCH / PUSCH repetition level may include information on the maximum repetition level, the number of repetitions corresponding to the PDSCH / PUSCH repetition level, and the value of the repetition level timer.
  • Information regarding the PDSCH / PUSCH repetition level may be set in the system information.
  • the RRC control unit 223 repeats the information corresponding to the maximum PDSCH / PUSCH repetition level and the PDSCH / PUSCH repetition level to the MAC control unit 219. Notify the number of times and the value of the repetition level timer.
  • the RRC control unit 223 notifies the PHY control unit 217 of the number of repetitions corresponding to the PDSCH / PUSCH repetition level.
  • 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 apparatus 5 communicates with the MTCUEs 3-1, 3-2, and 3-3 or the mobile station apparatuses 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 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 information related to the random access procedure for MTCUE 3-1 includes random access channel configuration information including physical random access channel PRACH arrangement information and random access preamble generation information, random access preamble selection information, PRACH repetition level (Repetition (Level) information, random access preamble transmission power information, random access preamble maximum transmission count information, random access response message reception information, message 3 transmission information, and contention resolution message reception random information Consists of access common setting information.
  • random access channel configuration information including physical random access channel PRACH arrangement information and random access preamble generation information, random access preamble selection information, PRACH repetition level (Repetition (Level) information, random access preamble transmission power information, random access preamble maximum transmission count information, random access response message reception information, message 3 transmission information, and contention resolution message reception random information Consists of access common setting information.
  • the information on the PRACH repetition level may include information on the number of repetitions of the random access preamble (Number (of petition) for each PRACH repetition level. Further, the information on the PRACH repetition level may include information (RepetitionLevelMax) indicating the maximum PRACH repetition level. Further, the information on the PRACH repetition level may include information for selecting the PRACH repetition level (for example, RSRP (Reference Symbol Received Power), RSRQ (Reference Symbol Symbol Received Quality), information related to a path loss threshold). Information regarding the PRACH repetition level may be included in the selection information of the random access preamble.
  • the selection information of the random access preamble includes group information of the random access preamble as shown in FIG. 3 (for example, information on the number of random access preambles of each group), information indicating the relationship between the group information of the random access preamble and the repetition level. It may be.
  • the selection information of the random access preamble includes the total number N of random access preambles that can be selected by the MTCUE 3-1, the number M of random access preambles in the preamble group A, or the number of random access preambles (NM) in the preamble group B,
  • the repetition level information corresponding to each group may be included.
  • the number of preamble groups may be three or more.
  • the information regarding the maximum number of transmissions of the random access preamble may be the maximum number of transmissions for one repeated transmission attempt (attempt).
  • information regarding the maximum number of transmissions of the random access preamble, information regarding reception of the random access response message, information regarding transmission of the message 3, and information regarding reception of the contention resolution message are configured in a plurality corresponding to the repetition level of the random access preamble. May be.
  • the information related to the random access procedure for the mobile station apparatus 1-1 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, and random access.
  • Random access common setting information including information on preamble transmission power, information on the maximum number of transmissions of random access preamble, information on reception of random access response message, information on transmission of message 3 and information on reception of contention resolution message .
  • the random access common setting information of the system information received by the mobile station apparatus 1-1 and the random access common setting information of the system information broadcasted to the MTCUE 3-1 are independent and may be different.
  • MTCUE 3-1 After receiving the system information for MTCUE, MTCUE 3-1 sets parameters included in the system information. In addition, the MTCUE 3-1 sets a mode (operation) in which transmission / reception is repeatedly performed (hereinafter referred to as a repetition mode). Note that the RRC layer of the MTCUE 3-1 sets the repetition mode based on the setting received from the base station apparatus 5.
  • the MTCUE 3-1 executes a random access procedure in order to connect to the base station apparatus 5.
  • the MAC layer of MTCUE 3-1 executes a random access procedure. In the following, a random access procedure when the repetition mode is set in the MTCUE 3-1 will be described.
  • the MAC layer of MTCUE3-1 sets random access common setting information. Further, the MAC layer of MTCUE 3-1 initializes parameters and the like related to the random access procedure. For example, the preamble transmission counter indicating the number of random access preamble transmissions (or the number of random access preamble attempts) is set to 1. The buffer for message 3 transmission is flushed (erased).
  • the MAC layer of the MTCUE 3-1 selects a PRACH repetition level based on a downlink radio propagation path (or downlink path loss (path loss)), and selects the selected PRACH repetition level as a temporary PRACH repetition level ( Set to Temporary (PRACH (Repetition Level)).
  • the MAC layer of MTCUE 3-1 sets the maximum number of transmissions (eg, preambleTransMax_rl) of the PRACH repetition level corresponding to the temporary PRACH repetition level. Further, the MAC layer of MTCUE 3-1 selects a preamble group corresponding to the temporary PRACH repetition level.
  • preambleTransMax_rl the maximum number of transmissions
  • the MAC layer of the MTCUE 3-1 may first select a preamble group and then select a temporary PRACH repetition level.
  • the MAC layer of the MTCUE 3-1 performs the first random access preamble transmission for the set temporary PRACH repetition level (or tries the first random access preamble transmission)
  • the MAC layer of the MTCUE 3-1 is set to the temporary PRACH repetition level. Sets the maximum number of transmissions for the corresponding PRACH repetition level. Also, the MAC layer of MTCUE 3-1 selects a preamble group corresponding to the temporary PRACH repetition level.
  • a preamble group used for transmission of a random access preamble corresponding to transmission is selected.
  • the MAC layer of the MTCUE 3-1 randomly selects a random access preamble from random access preambles belonging to (classified) the selected preamble group.
  • the MAC layer of MTCUE 3-1 selects a random access channel PRACH that can be transmitted.
  • the random access channel PRACH that can be transmitted may be the first random access channel PRACH from which repeated transmission is started.
  • the MAC layer of the MTCUE 3-1 calculates the reception power of the random access preamble assumed by the base station apparatus 5.
  • the MAC layer of the MTCUE 3-1 selects the selected random access preamble number (preamble ID), the selected random access channel PRACH, the temporary PRACH repetition level (or the number of repetitions corresponding to the temporary PRACH repetition level), RA -RNTI (random access response identification information) and the received power of the calculated random access preamble are notified to the physical layer of MTCUE 3-1.
  • preamble ID the selected random access preamble number
  • PRACH random access channel PRACH
  • the temporary PRACH repetition level or the number of repetitions corresponding to the temporary PRACH repetition level
  • RA -RNTI random access response identification information
  • the physical layer of MTCUE 3-1 generates a random access preamble using a random access preamble number.
  • the physical layer of the MTCUE 3-1 calculates the transmission power of the random access preamble using the reception power of the random access preamble.
  • the physical layer of MTCUE 3-1 transmits the generated random access preamble to the selected random access channel PRACH with the calculated transmission power. Further, the physical layer of MTCUE 3-1 transmits a random access preamble for the number of repetitions corresponding to the temporary PRACH repetition level.
  • the physical layer of the MTCUE 3-1 receives the RA-RNTI on the physical downlink control channel PDCCH or the extended physical downlink control channel E-PDCCH and receives a random access response (Random Access Response Window) To monitor.
  • the physical layer of the MTCUE 3-1 detects RA-RNTI in the physical downlink control channel PDCCH or the extended physical downlink control channel E-PDCCH
  • the physical layer decodes the physical downlink control channel shared channel PDSCH.
  • the physical layer of MTCUE3-1 notifies the random access response message obtained by decoding to the MAC layer of MTCUE3-1.
  • the physical layer of the MTCUE 3-1 is a physical downlink shared channel that is transmitted in the downlink resource region corresponding to the radio resource (arrangement information) of the physical random access channel PRACH of the random access preamble that is transmitted without using RA-RNTI. You may try to receive PDSCH.
  • the physical layer of the MTCUE 3-1 performs reception processing by repetition for reception processing for the random access response message. That is, the physical layer of the MTCUE 3-1 repeatedly performs reception processing on the physical downlink control channel PDCCH, the extended physical downlink control channel E-PDCCH, and / or the physical downlink control channel shared channel PDSCH.
  • the number of repeated receptions may be set corresponding to the temporary PRACH repetition level.
  • the MAC layer of the MTCUE 3-1 performs the following process when the reception of the random access response message is notified from the physical layer of the MTCUE 3-1. If the random access preamble number (preamble ID) corresponding to the random access preamble transmitted in the random access response message is included, the MAC layer of the MTCUE 3-1 determines that the random access response message has been successfully received. Also, the MAC layer of MTCUE 3-1 processes transmission timing information (transmission timing command) included in the random access response message.
  • transmission timing information transmission timing command
  • the MTCUE3-1 MAC layer When the repetition mode is set, the MTCUE3-1 MAC layer includes PDSCH / PUSCH repetition level information (PDSCH / PUSCH repetition level command) in the random access response message. Process the / PUSCH repetition level command. Further, the MAC layer of MTCUE3-1 notifies the uplink transmission permission information included in the random access response message to the physical layer of MTCUE3-1.
  • PDSCH / PUSCH repetition level command PDSCH / PUSCH repetition level command
  • the MAC layer of the MTCUE 3-1 Judge that the access procedure was successful.
  • the MAC layer of the MTCUE 3-1 It is determined that the access response message has not been successfully received.
  • the preamble transmission counter is incremented by 1.
  • the temporary PRACH repetition level is the maximum repetition rate.
  • the MAC layer of the MTCUE 3-1 notifies the upper layer (for example, the RRC layer of the MTCUE 3-1) of the random access problem (Random Access Problem).
  • the temporary PRACH repetition level is the maximum repetition rate. If it is not the level (RepetitionLevelMax), 1 is added to the temporary PRACH repetition level. That is, the temporary PRACH repetition level is raised by one step.
  • the preamble transmission counter is set to 1. Then, the MAC layer of the MTCUE 3-1 performs a random access resource selection process again in order to retransmit the random access preamble.
  • the MAC layer of the MTCUE 3-1 retransmits the random access preamble In order to do this, the selection process of the random access resource is performed again.
  • the RRC layer of MTCUE3-1 When the RRC layer of MTCUE3-1 is notified of the random access problem from the MAC layer of MTCUE3-1, it determines that the radio link has failed (radio radi link failure) and executes the connection ⁇ re-establishment procedure. To do.
  • the base station apparatus 5 performs the random access preamble reception process and the random access response transmission process on the assumption that the MTCUE 3-1 performs the random access preamble transmission process and the random access response reception process.
  • the base station apparatus 5 detects the random access preamble transmitted from the MTCUE 3-1 by changing the number of times the random access preamble is repeatedly received according to the preamble number.
  • the base station apparatus 5 After detecting the random access preamble, the base station apparatus 5 calculates the uplink transmission timing of the MTCUE 3-1 from the received random access preamble, and the transmission timing information including the calculated transmission timing, the MTCUE 3-1 transmits the message 3.
  • a random access response message including the uplink transmission permission information (Uplink grant), the preamble number of the received random access preamble, and the temporary C-RNTI, and the physical downlink shared channel PDSCH including the random access response message Send repeatedly. Note that the number of repeated transmissions of the random access response message is set according to the received random access preamble.
  • the base station apparatus 5 may include the repetition level of PDSCH reception and PUSCH transmission after the random access response is received or the number of repetitions of PDSCH reception and PUSCH transmission in the random access response message after the random access response is received. Alternatively, the base station apparatus 5 may include the number of repeated transmissions for message 3 transmission and the number of repeated receptions for contention resolution reception in the MTCUE 3-1 in the random access response message.
  • the physical layer of MTCUE 3-1 transmits message 3 based on the uplink transmission permission information. If the PDSCH / PUSCH repetition level command is included in the random access response message, the number of repetitions of message 3 is set to the number of repetitions corresponding to the PDSCH / PUSCH repetition level specified in the random access response message. You may make it do. Further, when the PDSCH / PUSCH repetition level is not specified in the random access response message, the repetition transmission number of message 3 may be set to the repetition number corresponding to the temporary PRACH repetition level.
  • the MAC layer of the MTCUE 3-1 starts a contention resolution timer.
  • the timer value of the contention resolution timer may be selected according to the temporary PRACH repetition level. Further, the timer value of the contention resolution timer may be selected according to the PDSCH / PUSCH repetition level.
  • the contention resolution timer may be started by the first transmission of the repeated transmission of the message 3.
  • the contention resolution timer may be started at the last transmission of the repeated transmission of the message 3.
  • the MAC layer of MTCUE3-1 is notified of the reception of PDCCH from the physical layer of MTCUE3-1, Temporary C-RNTI is included in the received PDCCH, and the corresponding contention resolution ID is scheduled. If the PSCH included in the PDSCH or the received PDCCH includes the C-RNTI for the own MTCUE 3-1, and the received PDCCH includes the uplink transmission permission information, the contention resolution is successful. Determine and stop the contention resolution timer.
  • the MAC layer of the MTCUE 3-1 regards the random access procedure as successful, and flushes the HARQ buffer of the message 3. Further, when the random access procedure is successful, the MAC layer of MTCUE 3-1 may use the temporary PRACH repetition level as the PRACH repetition level or the reference repetition level.
  • the MTCUE3-1 MAC layer determines that the contention resolution is not successful. If it is determined that contention resolution is not successful, the MAC layer of MTCUE 3-1 flushes the HARQ buffer of message 3.
  • the temporary PRACH repetition level is the maximum repetition level (RepetitionLevelMax).
  • the MAC layer of the MTCUE 3-1 notifies the upper layer (RRC layer) of the random access problem.
  • the temporary PRACH repetition level is not the maximum repetition level (RepetitionLevelMax) In this case, 1 is added to the temporary PRACH repetition level. That is, the temporary PRACH repetition level is raised by one step.
  • the preamble transmission counter is set to 1. Then, the MAC layer of the MTCUE 3-1 performs a random access resource selection process again in order to retransmit the random access preamble.
  • the base station apparatus 5 performs the message 3 reception process and the contention resolution transmission process on the assumption that the MTCUE 3-1 performs the message 3 transmission process and the contention reception process. .
  • the base station apparatus 5 When the base station apparatus 5 receives the message 3, the base station apparatus 5 transmits a contention resolution to the MTCUE 3-1. The repeated reception of message 3 and the repeated transmission of contention resolution are performed with the number of repetitions corresponding to the PDSCH / PUSCH repetition level indicated by the PDSCH / PUSCH repetition level command. When the PDSCH / PUSCH repetition level command is not notified, the base station apparatus 5 receives the message 3 and transmits the contention resolution with the repetition number of repetition levels corresponding to the random access preamble.
  • reception processing of information indicating the PDSCH / PUSCH repetition level (PDSCH / PUSCH repetition level command) will be described below.
  • the PDSCH / PUSCH repetition level is controlled (or managed) using a repetition level timer. While the repetition level timer is running, the PDSCH / PUSCH repetition level indicated by the PDSCH / PUSCH repetition level command is valid.
  • MAC Control Element MAC control information
  • the MAC layer of MTCUE 3-1 sets the PDSCH / PUSCH repetition level value indicated by the PDSCH / PUSCH repetition level command to the PDSCH / PUSCH repetition level.
  • the MAC layer of MTCUE3-1 notifies the set PDSCH / PUSCH repetition level to the physical layer of MTCUE3-1. Then, the MAC layer of MTCUE 3-1 starts or restarts the repetition level timer.
  • the transmitted random access preamble is not the random access preamble selected by the MAC layer of the MTCUE 3-1, that is, when the random access preamble is notified by the random access instruction, the MAC layer of the MTCUE 3-1, the random access response message
  • the value indicated by the PDSCH / PUSCH repetition level command is set to the PDSCH / PUSCH repetition level.
  • the MAC layer of MTCUE3-1 notifies the set PDSCH / PUSCH repetition level to the physical layer of MTCUE3-1. Then, the MAC layer of MTCUE 3-1 starts or restarts the repetition level timer.
  • the MAC layer of MTCUE 3-1 sets the value indicated by the random access response message as the PDSCH / PUSCH repetition level.
  • the MAC layer of MTCUE3-1 notifies the set PDSCH / PUSCH repetition level to the physical layer of MTCUE3-1. Then, the MAC layer of MTCUE3-1 starts a repetition level timer.
  • the MAC layer of the MTCUE 3-1 may stop the repetition level timer.
  • the MAC layer of the MTCUE 3-1 may set a default value for the PDSCH / PUSCH repetition level.
  • the default value in this case may be notified by system information.
  • the default value may be a predetermined value.
  • the value of the repetition level timer may be notified by system information or may be notified individually. Further, the value of the transmission level timer may be substituted for the value of the repetition level timer.
  • the physical layer of the MTCUE 3-1 repeats the physical downlink control channel PDCCH, the extended physical downlink control channel E-PDCCH, and the physical by the number of repetitions corresponding to the PDSCH / PUSCH repetition level.
  • a reception process for the downlink shared channel PDSCH and a transmission process for the physical uplink control channel PUCCH physical uplink shared channel PUSCH are performed.
  • the base station apparatus 5 may include information on the PDSCH / PUSCH repetition level including the number of repetitions corresponding to the PDSCH / PUSCH repetition level in the system information and notify the MTCUE 3-1. Moreover, the base station apparatus 5 may notify the information regarding PDSCH / PUSCH repetition level for each MTCUE.
  • the information on the PDSCH / PUSCH repetition level may include information on the maximum repetition level, the number of repetitions corresponding to the PDSCH / PUSCH repetition level, and the value of the repetition level timer.
  • a random access resource selection process for random access preamble transmission in the MAC layer of MTCUE 3-1 will be specifically described with reference to FIG.
  • the MAC layer of MTCUE 3-1 determines whether message 3 is not transmitted, that is, whether the MAC layer of MTCUE 3-1 is the first random access preamble transmission (or the first attempt of random access preamble transmission). It is determined whether or not (S101). When message 3 is not transmitted (when S101 is Yes), the MAC layer of MTCUE 3-1 sets the PRACH repetition level based on the downlink radio propagation path (or downlink path loss (path (loss)). Select (S102). The MAC layer of MTCUE3-1 sets the selected PRACH repetition level to a temporary PRACH repetition level (Temporary PRACH Repetition Level).
  • the MAC layer of MTCUE 3-1 sets the maximum number of transmissions (preambleTransMax_rl) of the PRACH repetition level corresponding to the temporary PRACH repetition level (S103). Further, the MAC layer of MTCUE 3-1 selects a preamble group corresponding to the temporary PRACH repetition level (S104).
  • the MAC layer of the MTCUE 3-1 randomly selects a random access preamble from the random access preambles in the selected preamble group (S105).
  • the MAC layer of MTCUE 3-1 selects a random access channel PRACH that can be transmitted (S106).
  • the MAC layer of the MTCUE 3-1 calculates the received power of the random access preamble assumed by the base station device 5 (S107).
  • the MAC layer of the MTCUE 3-1 sets the set temporary PRACH replica. It is determined whether it is the first random access preamble transmission (or the first trial of random access preamble transmission) with respect to the session level (S108).
  • the MAC layer of the MTCUE 3-1 determines the PRACH repetition level corresponding to the temporary PRACH repetition level.
  • the maximum number of transmissions is set (S109).
  • the MAC layer of MTCUE 3-1 selects a preamble group corresponding to the temporary PRACH repetition level (S110). Then, the MAC layer of MTCUE 3-1 performs processing of selection of random access preamble (S105), selection of random access channel PRACH (S106), and calculation of reception power of random access preamble (107).
  • the MAC layer of MTCUE 3-1 The preamble group used for transmission of the random access preamble corresponding to the transmission of message 3 is selected (S111).
  • the MAC layer of MTCUE 3-1 determines whether or not a random access response message has been received within the random access response reception period (S201). When a random access response message is received within the random access response reception period (when S201 is Yes), the MAC layer of MTCUE3-1 includes a preamble number corresponding to the random access preamble transmitted in the random access response message. It is determined whether or not (S202).
  • the MAC layer of the MTCUE 3-1 determines that the random access response message has been successfully received (S203).
  • the MAC layer of the MTCUE 3-1 processes transmission timing information (transmission timing command) included in the random access response message (S204).
  • the MAC layer of MTCUE 3-1 processes information (PDSCH / PUSCH repetition level command) indicating the PDSCH / PUSCH repetition level included in the random access response message (S205).
  • the MAC layer of MTCUE3-1 notifies the uplink transmission permission information included in the random access response message to the physical layer of MTCUE3-1 (S206).
  • the MAC layer of the MTCUE 3-1 determines that the random access response message has not been successfully received (S207). That is, the MAC layer of MTCUE3-1 determines that reception of the random access response message has failed.
  • the MAC layer of the MTCUE 3-1 confirms whether or not the notification of the power ramping suspension has been received from the physical layer of the MTCUE 3-1 (S208).
  • the MAC layer of MTCUE3-1 adds 1 to the preamble transmission counter (S209).
  • the MAC layer of MTCUE 3-1 determines whether or not the value of the preamble transmission counter exceeds the maximum number of transmissions of the random access preamble of the set temporary temporary PRACH repetition level (S210). When the notification of the power ramping suspension is not received from the physical layer of the MTCUE 3-1 (when S208 is Yes), the MAC layer of the MTCUE 3-1 determines the preamble transmission counter (S210). When the value of the preamble transmission counter does not exceed the maximum number of transmissions of the random access preamble of the set temporary temporary PRACH repetition level (when S210 is No), the MAC layer of the MTCUE 3-1 has been described above. Random access resource selection processing is performed (S215).
  • the MAC layer of the MTCUE 3-1 has a temporary PRACH repetition level of It is confirmed whether or not the maximum repetition level (RepetitionLevelMax) is reached (S211).
  • the MTCUE3-1 MAC layer notifies the upper layer of the random access problem (random ⁇ access problem) (S212). Then, the MAC layer of the MTCUE 3-1 performs the random access resource selection process described above (S215).
  • the MTCUE3-1 MAC layer adds 1 to the temporary PRACH repetition level (S213). That is, the MAC layer of MTCUE3-1 raises the temporary PRACH repetition level by one level. Then, the MAC layer of MTCUE 3-1 sets the preamble transmission counter to 1 (S214). The MAC layer of MTCUE 3-1 performs the random access resource selection process described above (S215).
  • the MAC layer of MTCUE 3-1 determines whether or not a PDSCH / PUSCH repetition level command has been received using MAC control information (MAC control element) (S301).
  • MAC control information MAC control element
  • the MAC layer of the MTCUE 3-1 is the value of the PDSCH / PUSCH repetition level indicated by the PDSCH / PUSCH repetition level command. Is set to the PDSCH / PUSCH repetition level (S302).
  • the MAC layer of MTCUE3-1 notifies the set PDSCH / PUSCH repetition level to the physical layer of MTCUE3-1 (S303). Then, the MTCUE3-1 MAC layer starts or restarts the repetition level timer (S304).
  • the PDSCH / PUSCH repetition level command is received by the random access response message (when S301 is No)
  • the MAC layer of MTCUE3-1 sets the PDSCH / PUSCH repetition level (S302), PDSCH / PUSCH repetition level notification (S303), repetition level timer start or restart (S304).
  • the MAC layer of MTCUE3-1 confirms whether the repetition level timer is running or not. (S306).
  • the MAC layer of the MTCUE 3-1 sets the value indicated by the random access response message to the PDSCH / PUSCH repetition level (S307).
  • the MAC layer of MTCUE3-1 notifies the set PDSCH / PUSCH repetition level to the physical layer of MTCUE3-1 (S308). Then, the MAC layer of MTCUE 3-1 starts a repetition level timer (S309).
  • the MAC layer of MTCUE3-1 ignores the PDSCH / PUSCH repetition level command (PDSCH / PUSCH repetition level information) in the random access response message.
  • the base station apparatus 5 also controls (manages) the PDSCH / PUSCH repetition level of the MTCUE 3-1 using the repetition level timer similarly to the MTCUE 3-1.
  • the base station apparatus 5 When the MTCUE 3-1 receives the PDSCH / PUSCH repetition level command with the MAC control information, the base station apparatus 5 starts or restarts the repetition level timer.
  • the base station apparatus 5 is the case where the MAC layer of the MTCUE 3-1 receives the PDSCH / PUSCH repetition level command in the random access response message, and the received random access preamble is selected by the MAC layer of the MTCUE 3-1. If it is not the random access preamble, that is, if the base station apparatus 5 notifies the random access preamble according to the random access instruction, the repetition level timer is started or restarted.
  • the base station device 5 sets the repetition level timer when the MAC layer of the MTCUE 3-1 receives the PDSCH / PUSCH repetition level command in the random access response message and the repetition level timer is not running. Start.
  • the base station apparatus 5 may transmit the PDSCH / PUSCH repetition level command. Further, when the MTCUE 3-1 receives the PDSCH / PUSCH repetition level command, the base station apparatus 5 may receive an acknowledgment (ACK) to the PDSCH / PUSCH repetition level command from the MTCUE 3-1.
  • ACK acknowledgment
  • the MTCUE 3-1 may stop the random access procedure or restart the random access procedure from the beginning when the repetition level changes during the execution of the random access procedure. For example, the MTCUE 3-1 measures the downlink radio quality (for example, path loss) during execution of the random access procedure, and uses the PRACH repetition level or the PDSCH / PUSCH repetition level and the downlink radio quality measurement result. If the obtained PRACH repetition level is different, the random access procedure may be stopped, or the random access procedure may be redone using the obtained repetition level.
  • the downlink radio quality for example, path loss
  • 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.
  • a radio communication system is a radio communication system in which a base station apparatus and a terminal apparatus communicate with each other, and the terminal apparatus detects a downlink path loss when the message 3 is not transmitted.
  • a repetition level is selected, a parameter corresponding to the repetition level is set, a preamble group is selected based on the repetition level, and when the message 3 is not transmitted, the base station apparatus is in the downlink From the path loss, a repetition level is selected, a parameter corresponding to the repetition level is set, and a preamble group is selected based on the repetition level, and a random access preamble reception process is performed.
  • a terminal apparatus is a terminal apparatus that communicates with a base station apparatus, and the MAC layer of the terminal apparatus repeats from a downlink path loss when the message 3 is not transmitted.
  • a level is selected, a parameter corresponding to the repetition level is set, and a preamble group is selected based on the repetition level.
  • the MAC layer of the terminal device in the above aspect of the present invention is a case where the message 3 is retransmitted, and the random access preamble transmission at the set repetition level is the first attempt.
  • message 3 When a preamble group corresponding to the set repetition level is selected and message 3 is retransmitted, and random access preamble transmission at the set repetition level is not the first attempt, message 3 The preamble group used for random access preamble transmission corresponding to transmission of is selected.
  • the MAC layer of the terminal device selects a random access preamble from the selected preamble group.
  • a base station apparatus is a base station apparatus that communicates with a terminal apparatus and executes a random access procedure, and notifies the terminal apparatus of a parameter corresponding to a repetition level. Is not transmitting message 3, it is assumed that the terminal device selects a repetition level from downlink path loss, sets a parameter corresponding to the repetition level, and selects a preamble group based on the repetition level. Then, the random access preamble reception process is performed.
  • the wireless communication method is a wireless communication method applied to a terminal device that communicates with a base station device and executes a random access procedure, and the message 3 is not transmitted. Selecting a repetition rate from downlink path loss, setting a parameter corresponding to the repetition level, selecting a preamble group based on the repetition level, and a case where message 3 is retransmitted.
  • the step of selecting a preamble group corresponding to the set repetition level and the case where the message 3 is retransmitted comprising the steps of: selecting a preamble group used for the random access preamble transmission corresponding to the transmission of the message 3, the step of selecting a random access preamble from the selected preamble group.
  • An integrated circuit is an integrated circuit that is applied to a terminal device that communicates with a base station device and executes a random access procedure, and when the message 3 is not transmitted, A means for selecting a repetition level from a path loss of a link, setting a parameter corresponding to the repetition level, a means for selecting a preamble group based on the repetition level, and a message 3 being retransmitted.
  • the means for selecting the preamble group corresponding to the set repetition level and the message 3 are retransmitted , Random access pre-set at the set repetition level If tumble transmission is not the first attempt, a means for selecting the preamble group used for the random access preamble transmission corresponding to the transmission of the message 3, the means for selecting a random access preamble from the selected preamble group.
  • the present invention can be applied to at least a mobile phone, a personal computer, a tablet computer, and the like.
  • 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

Abstract

La présente invention concerne un système de communication sans fil comprenant un dispositif de station de base et un dispositif terminal qui communiquent, le dispositif terminal recevant des informations permettant de sélectionner un niveau, lesdites informations comprenant le nombre de répétitions pour chaque niveau et une valeur de seuil d'affaiblissement de propagation, sélectionnant un niveau à partir de l'affaiblissement de propagation en liaison descendante, réglant des paramètres correspondant au niveau, et sélectionnant un groupe de préambules en fonction du niveau.
PCT/JP2016/060966 2015-04-03 2016-04-01 Système de communication sans fil, dispositif terminal, dispositif de station de base, procédé de communication sans fil et circuit intégré WO2016159372A1 (fr)

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